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Sample records for camp response element

  1. Hypoxic regulation of lactate dehydrogenase A. Interaction between hypoxia-inducible factor 1 and cAMP response elements.

    Science.gov (United States)

    Firth, J D; Ebert, B L; Ratcliffe, P J

    1995-09-08

    The oxygen-regulated control system responsible for the induction of erythropoietin (Epo) by hypoxia is present in most (if not all) cells and operates on other genes, including those involved in energy metabolism. To understand the organization of cis-acting sequences that are responsible for oxygen-regulated gene expression, we have studied the 5' flanking region of the mouse gene encoding the hypoxically inducible enzyme lactate dehydrogenase A (LDH). Deletional and mutational analysis of the function of mouse LDH-reporter fusion gene constructs in transient transfection assays defined three domains, between -41 and -84 base pairs upstream of the transcription initiation site, which were crucial for oxygen-regulated expression. The most important of these, although not capable of driving hypoxic induction in isolation, had the consensus of a hypoxia-inducible factor 1 (HIF-1) site, and cross-competed for the binding of HIF-1 with functionally active Epo and phosphoglycerate kinase-1 sequences. The second domain was positioned close to the HIF-1 site, in an analogous position to one of the critical regions in the Epo 3' hypoxic enhancer. The third domain had the motif of a cAMP response element (CRE). Activation of cAMP by forskolin had no effect on the level of LDH mRNA in normoxia, but produced a magnified response to hypoxia that was dependent upon the integrity of the CRE, indicating an interaction between inducible factors binding the HIF-1 and CRE sites.

  2. Hippocampal expression of synaptic structural proteins and phosphorylated cAMP response element-binding protein in a rat model of vascular dementia induced by chronic cerebral hypoperfusion

    Institute of Scientific and Technical Information of China (English)

    Hui Zhao; Zhiyong Li; Yali Wang; Qiuxia Zhang

    2012-01-01

    The present study established a rat model of vascular dementia induced by chronic cerebral hy-poperfusion through permanent ligation of bilateral common carotid arteries. At 60 days after mod-eling, escape latency and swimming path length during hidden-platform acquisition training in Morris water maze significantly increased in the model group. In addition, the number of accurate crossings over the original platform significantly decreased, hippocampal CA1 synaptophysin and growth-associated protein 43 expression significantly decreased, cAMP response element-binding protein expression remained unchanged, and phosphorylated cAMP response element-binding protein expression significantly decreased. Results suggested that abnormal expression of hippo-campal synaptic structural protein and cAMP response element-binding protein phosphorylation played a role in cognitive impairment following chronic cerebral hypoperfusion.

  3. cAMP response element binding protein (CREB activates transcription via two distinct genetic elements of the human glucose-6-phosphatase gene

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    Stefano Luisa

    2005-01-01

    Full Text Available Abstract Background The enzyme glucose-6-phosphatase catalyzes the dephosphorylation of glucose-6-phosphatase to glucose, the final step in the gluconeogenic and glycogenolytic pathways. Expression of the glucose-6-phosphatase gene is induced by glucocorticoids and elevated levels of intracellular cAMP. The effect of cAMP in regulating glucose-6-phosphatase gene transcription was corroborated by the identification of two genetic motifs CRE1 and CRE2 in the human and murine glucose-6-phosphatase gene promoter that resemble cAMP response elements (CRE. Results The cAMP response element is a point of convergence for many extracellular and intracellular signals, including cAMP, calcium, and neurotrophins. The major CRE binding protein CREB, a member of the basic region leucine zipper (bZIP family of transcription factors, requires phosphorylation to become a biologically active transcriptional activator. Since unphosphorylated CREB is transcriptionally silent simple overexpression studies cannot be performed to test the biological role of CRE-like sequences of the glucose-6-phosphatase gene. The use of a constitutively active CREB2/CREB fusion protein allowed us to uncouple the investigation of target genes of CREB from the variety of signaling pathways that lead to an activation of CREB. Here, we show that this constitutively active CREB2/CREB fusion protein strikingly enhanced reporter gene transcription mediated by either CRE1 or CRE2 derived from the glucose-6-phosphatase gene. Likewise, reporter gene transcription was enhanced following expression of the catalytic subunit of cAMP-dependent protein kinase (PKA in the nucleus of transfected cells. In contrast, activating transcription factor 2 (ATF2, known to compete with CREB for binding to the canonical CRE sequence 5'-TGACGTCA-3', did not transactivate reporter genes containing CRE1, CRE2, or both CREs derived from the glucose-6-phosphatase gene. Conclusions Using a constitutively active CREB2

  4. cAMP response element binding protein is required for differentiation of respiratory epithelium during murine development.

    Directory of Open Access Journals (Sweden)

    A Daniel Bird

    Full Text Available The cAMP response element binding protein 1 (Creb1 transcription factor regulates cellular gene expression in response to elevated levels of intracellular cAMP. Creb1(-/- fetal mice are phenotypically smaller than wildtype littermates, predominantly die in utero and do not survive after birth due to respiratory failure. We have further investigated the respiratory defect of Creb1(-/- fetal mice during development. Lungs of Creb1(-/- fetal mice were pale in colour and smaller than wildtype controls in proportion to their reduced body size. Creb1(-/- lungs also did not mature morphologically beyond E16.5 with little or no expansion of airway luminal spaces, a phenotype also observed with the Creb1(-/- lung on a Crem(-/- genetic background. Creb1 was highly expressed throughout the lung at all stages examined, however activation of Creb1 was detected primarily in distal lung epithelium. Cell differentiation of E17.5 Creb1(-/- lung distal epithelium was analysed by electron microscopy and showed markedly reduced numbers of type-I and type-II alveolar epithelial cells. Furthermore, immunomarkers for specific lineages of proximal epithelium including ciliated, non-ciliated (Clara, and neuroendocrine cells showed delayed onset of expression in the Creb1(-/- lung. Finally, gene expression analyses of the E17.5 Creb1(-/- lung using whole genome microarray and qPCR collectively identified respiratory marker gene profiles and provide potential novel Creb1-regulated genes. Together, these results demonstrate a crucial role for Creb1 activity for the development and differentiation of the conducting and distal lung epithelium.

  5. Chronic antidepressant administration increases the expression of cAMP response element binding protein (CREB) in rat hippocampus.

    Science.gov (United States)

    Nibuya, M; Nestler, E J; Duman, R S

    1996-04-01

    The present study demonstrates that chronic, but not acute, adminstration of several different classes of antidepressants, including serotonin- and norepinephrine-selective reuptake inhibitors, increases the expression of cAMP response element binding protein (CREB) mRNA in rat hippocampus. In contrast, chronic administration of several nonantidepressant psychotropic drugs did not influence expression of CREB mRNA, demonstrating the pharmacological specificity of this effect. In situ hybridization analysis demonstrates that antidepressant administration increases expression of CREB mRNA in CA1 and CA3 pyramidal and dentate gyrus granule cell layers of the hippocampus. In addition, levels of CRE immunoreactivity and of CRE binding activity were increased by chronic antidepressant administration, which indicates that expression and function of CREB protein are increased along with its mRNA. Chronic administration of the phosphodiesterase (PDE) inhibitors rolipram or papaverine also increased expression of CREB mRNA in hippocampus, demonstrating a role for the cAMP cascade. Moreover, coadministration of rolipram with imipramine resulted in a more rapid induction of CREB than with either treatment alone. Increased expression and function of CREB suggest that specific target genes may be regulated by these treatments. We have found that levels of brain-derived neurotrophic factor (BDNF) and trkB mRNA are also increased by administration of antidepressants or PDE inhibitors. These findings indicate that upregulation of CREB is a common action of chronic antidepressant treatments that may lead to regulation of specific target genes, such as BDNF and trkB, and to the long-term effects of these treatments on brain function.

  6. MicroRNA-181b targets cAMP responsive element binding protein 1 in gastric adenocarcinomas.

    Science.gov (United States)

    Chen, Lin; Yang, Qian; Kong, Wei-Qing; Liu, Tao; Liu, Min; Li, Xin; Tang, Hua

    2012-07-01

    MicroRNAs are a class of small endogenous non-coding RNAs that function as post-transcriptional regulators. In our previous study, we found that miR-181b was significantly downregulated in human gastric adenocarcinoma tissue samples compared to the adjacent normal gastric tissues. In this study, we confirm the down-regulation of miR-181b in human gastric cancer cell lines versus the gastric epithelial cells. Overexpression of miR-181b suppressed the proliferation and colony formation rate of gastric cancer cells. miR-181b downregulated the expression of cAMP responsive element binding protein 1 (CREB1) by binding its 3' untranslated region. Overexpression of CREB1 counteracted the suppression of growth in gastric cancer cells caused by ectopic expression of miR-181b. These results indicate that miR-181b may function as a tumor suppressor in gastric adenocarcinoma cells through negative regulation of CREB1.

  7. Loss of Kv3.1 tonotopicity and alterations in cAMP response element-binding protein signaling in central auditory neurons of hearing impaired mice.

    Science.gov (United States)

    von Hehn, Christian A A; Bhattacharjee, Arin; Kaczmarek, Leonard K

    2004-02-25

    The promoter for the kv3.1 potassium channel gene is regulated by a Ca2+-cAMP responsive element, which binds the transcription factor cAMP response element-binding protein (CREB). Kv3.1 is expressed in a tonotopic gradient within the medial nucleus of the trapezoid body (MNTB) of the auditory brainstem, where Kv3.1 levels are highest at the medial end, which corresponds to high auditory frequencies. We have compared the levels of Kv3.1, CREB, and the phosphorylated form of CREB (pCREB) in a mouse strain that maintains good hearing throughout life, CBA/J (CBA), with one that suffers early cochlear hair cell loss, C57BL/6 (BL/6). A gradient of Kv3.1 immunoreactivity in the MNTB was detected in both young (6 week) and older (8 month) CBA mice. Although no gradient of CREB was detected, pCREB-immunopositive cells were grouped together in distinct clusters along the tonotopic axis. The same pattern of Kv3.1, CREB, and pCREB localization was also found in young BL/6 mice at a time (6 weeks) when hearing is normal. In contrast, at 8 months, when hearing is impaired, the gradient of Kv3.1 was abolished. Moreover, in the older BL/6 mice there was a decrease in CREB expression along the tonotopic axis, and the pattern of pCREB labeling appeared random, with no discrete clusters of pCREB-positive cells along the tonotopic axis. Our findings are consistent with the hypothesis that ongoing activity in auditory brainstem neurons is necessary for the maintenance of Kv3.1 tonotopicity through the CREB pathway.

  8. Differential regulation of phosphorylation of the cAMP response element-binding protein after activation of EP2 and EP4 prostanoid receptors by prostaglandin E2.

    Science.gov (United States)

    Fujino, Hiromichi; Salvi, Sambhitab; Regan, John W

    2005-07-01

    The EP2 and EP4 prostanoid receptors are G-protein-coupled receptors whose activation by their endogenous ligand, prostaglandin (PG) E2, stimulates the formation of intracellular cAMP. We have previously reported that the stimulation of cAMP formation in EP4-expressing cells is significantly less than in EP2-expressing cells, despite nearly identical levels of receptor expression (J Biol Chem 277:2614-2619, 2002). In addition, a component of EP4 receptor signaling, but not of EP2 receptor signaling, was found to involve the activation of phosphatidylinositol 3-kinase (PI3K). In this study, we report that PGE2 stimulation of cells expressing either the EP2 or EP4 receptor results in the phosphorylation of the cAMP response element binding protein (CREB) at serine-133. Pretreatment of cells with N-[2-(4-bromocinnamylamino)ethyl]-5-isoquinoline (H-89), an inhibitor of protein kinase A (PKA), attenuated the PGE2-mediated phosphorylation of CREB in EP2-expressing cells, but not in EP4-expressing cells. Pretreatment of cells with wortmannin, an inhibitor of PI3K, had no effects on the PGE2-mediated phosphorylation of CREB in either EP2- or EP4-expressing cells, although it significantly increased the PGE2-mediated activation of PKA in EP4-expressing cells. However, combined pretreatment with H-89 and wortmannin blocked PGE2-mediated phosphorylation in EP2-expressing cells as well as in EP2-expressing cells. PGE2-mediated intracellular cAMP formation was not affected by pretreatment with wortmannin, or combined treatment with wortmannin and H-89, in either the EP2- or EP4-expressing cells. These findings suggest that PGE2 stimulation of EP4 receptors, but not EP2 receptors, results in the activation of a PI3K signaling pathway that inhibits the activity of PKA and that the PGE2-mediated phosphorylation of CREB by these receptors occurs through different signaling pathways

  9. Prophylactic Melatonin Attenuates Isoflurane-Induced Cognitive Impairment in Aged Rats through Hippocampal Melatonin Receptor 2 - cAMP Response Element Binding Signalling.

    Science.gov (United States)

    Liu, Yajie; Ni, Cheng; Li, Zhengqian; Yang, Ning; Zhou, Yang; Rong, Xiaoying; Qian, Min; Chui, Dehua; Guo, Xiangyang

    2017-03-01

    Melatonin exerts many physiological effects via melatonin receptors, among which the melatonin-2 receptor (MT2 ) plays a critical role in circadian rhythm disorders, Alzheimer's disease and other neurological disorders. A melatonin replacement strategy has been tested previously, and MT2 was a critical target during the process. cAMP response element binding (CREB) is an essential transcription factor for memory formation and could be involved in MT2 signalling. Therefore, the present study was designed to investigate the effects of prophylactic melatonin on inhaled anaesthetic isoflurane-induced cognitive impairment, and to determine whether the protective effects of melatonin are dependent on MT2 and downstream CREB signalling in the hippocampus of aged rats. The results showed that prophylactic melatonin attenuated isoflurane-induced decreases in plasma/hippocampal melatonin levels and cognitive impairment in aged rats. Furthermore, 4P-PDOT, a selective MT2 antagonist, blocked the protective effects of melatonin on isoflurane-induced decreases in both hippocampal MT2 expression and downstream CREB phosphorylation. And 4P-PDOT blocked the attenuation of melatonin on isoflurane-induced memory impairment. Collectively, the results suggest that the protective effects of prophylactic melatonin are dependent on hippocampal MT2 -CREB signalling, which could be a potential therapeutic target for anaesthetic-induced cognitive impairment.

  10. Detection of novelty, but not memory of spatial habituation, is associated with an increase in phosphorylated cAMP response element-binding protein levels in the hippocampus.

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    Winograd, Milena; Viola, Haydée

    2004-01-01

    There is a growing body of evidence showing that the formation of associative memories is associated with an increase in phosphorylated cAMP response element-binding protein (pCREB) levels. We recently reported increased pCREB levels in the rat hippocampus after an exploration to a novel environment. In the present work, we studied whether this increment in CREB activation is associated with the formation of memory of habituation to a novel environment or with the detection of novelty. Rats were submitted to consecutive open field sessions at 3-h intervals. Measurement of the hippocampal pCREB level, carried out 1 h after each training session, showed that (1) it did not increase when rats explored a familiar environment; (2) it did not increase after a reexposure that improves the memory of habituation; (3) it increased after a brief novel exploration unable to form memory of habituation; and (4) it increased in amnesic rats for spatial habituation. Taken as a whole, our results suggest that the elevated pCREB level after a single open field exploration is not associated with the memory formation of habituation. It is indeed associated with the detection of a novel environment.

  11. Changes of phosphorylation of cAMP response element binding protein in rat nucleus accumbens after chronic ethanol intake: naloxone reversal

    Institute of Scientific and Technical Information of China (English)

    LIJing; LIYue-Hua; YUANXiao-Ru

    2003-01-01

    AIM: To study the changes in the expression and phosphorylation of cAMP response element binding protein(CREB) in the rat nucleus accumbens after chronic ethanol intake and its withdrawal. METHODS: Ethanol wasgiven in drinking water at the concentration of 6 % (v/v), for one month. Changes in the levels of CREB andphospho-CREB (p-CREB) protein in the nucleus accumbens were measured by immunohistochemistry methods.RESULTS: Ethanol given to rats in drinking water decreased the level of p-CREB protein in the nucleus accumbens(-75 %) at the time of exposure to ethanol. The decrement of p-CREB protein in the nucleus accumbens remainedat 24 h (-35 %) and 72 h (-28 %) of ethanol withdrawal, which recovered toward control level after 7 d of ethanolwithdrawal. However, chronic ethanol, as well as ethanol withdrawal failed to produce any significant alteration inthe level of CREB protein in the nucleus accumbens. Naloxone (alone) treatment of rats had no effect on the levelsof CREB and p-CREB protein in the nucleus accumbens. However, when naloxone was administered concurrentlywith ethanol treatment, it antagonized the down-regulation of p-CREB protein in the nucleus accumbens (142 %) ofrats exposed to ethanol. CONCLUSION: A long-term intake of ethanol solution down-regulates the phosphoryla-tion of CREB in the nucleus accumbens, and those changes can be reversed by naloxone, which may be one kindof the molecular mechanisms associated with ethano1 dependence.

  12. Aldose Reductase Regulates Microglia/Macrophages Polarization Through the cAMP Response Element-Binding Protein After Spinal Cord Injury in Mice.

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    Zhang, Qian; Bian, Ganlan; Chen, Peng; Liu, Ling; Yu, Caiyong; Liu, Fangfang; Xue, Qian; Chung, Sookja K; Song, Bing; Ju, Gong; Wang, Jian

    2016-01-01

    Inflammatory reactions are the most critical pathological processes occurring after spinal cord injury (SCI). Activated microglia/macrophages have either detrimental or beneficial effects on neural regeneration based on their functional polarized M1/M2 subsets. However, the mechanism of microglia/macrophage polarization to M1/M2 at the injured spinal cord environment remains unknown. In this study, wild-type (WT) or aldose reductase (AR)-knockout (KO) mice were subjected to SCI by a spinal crush injury model. The expression pattern of AR, behavior tests for locomotor activity, and lesion size were assessed at between 4 h and 28 days after SCI. We found that the expression of AR is upregulated in microglia/macrophages after SCI in WT mice. In AR KO mice, SCI led to smaller injury lesion areas compared to WT. AR deficiency-induced microglia/macrophages induce the M2 rather than the M1 response and promote locomotion recovery after SCI in mice. In the in vitro experiments, microglia cell lines (N9 or BV2) were treated with the AR inhibitor (ARI) fidarestat. AR inhibition caused 4-hydroxynonenal (HNE) accumulation, which induced the phosphorylation of the cAMP response element-binding protein (CREB) to promote Arg1 expression. KG501, the specific inhibitor of phosphorylated CREB, could cancel the upregulation of Arg1 by ARI or HNE stimulation. Our results suggest that AR works as a switch which can regulate microglia by polarizing cells to either the M1 or the M2 phenotype under M1 stimulation based on its states of activity. We suggest that inhibiting AR may be a promising therapeutic method for SCI in the future.

  13. Bidirectional regulation of the cAMP response element binding protein encodes spatial map alignment in prism-adapting barn owls.

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    Nichols, Grant S; DeBello, William M

    2008-10-01

    The barn owl midbrain contains mutually aligned maps of auditory and visual space. Throughout life, map alignment is maintained through the actions of an instructive signal that encodes the magnitude of auditory-visual mismatch. The intracellular signaling pathways activated by this signal are unknown. Here we tested the hypothesis that CREB (cAMP response element-binding protein) provides a cell-specific readout of instructive information. Owls were fitted with prismatic or control spectacles and provided rich auditory-visual experience: hunting live mice. CREB activation was analyzed within 30 min of hunting using phosphorylation state-specific CREB (pCREB) and CREB antibodies, confocal imaging, and immunofluorescence measurements at individual cell nuclei. In control owls or prism-adapted owls, which experience small instructive signals, the frequency distributions of pCREB/CREB values obtained for cell nuclei within the external nucleus of the inferior colliculus (ICX) were unimodal. In contrast, in owls adapting to prisms or readapting to normal conditions, the distributions were bimodal: certain cells had received a signal that positively regulated CREB and, by extension, transcription of CREB-dependent genes, whereas others received a signal that negatively regulated it. These changes were restricted to the subregion of the inferior colliculus that received optically displaced input, the rostral ICX, and were not evident in the caudal ICX or central nucleus. Finally, the topographic pattern of CREB regulation was patchy, not continuous, as expected from the actions of a topographically precise signal encoding discrete events. These results support a model in which the magnitude of CREB activation within individual cells provides a readout of the instructive signal that guides plasticity and learning.

  14. Bicarbonate-responsive “soluble” adenylyl cyclase defines a nuclear cAMP microdomain

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    Zippin, Jonathan H.; Farrell, Jeanne; Huron, David; Kamenetsky, Margarita; Hess, Kenneth C.; Fischman, Donald A.; Levin, Lonny R.; Buck, Jochen

    2004-01-01

    Bicarbonate-responsive “soluble” adenylyl cyclase resides, in part, inside the mammalian cell nucleus where it stimulates the activity of nuclear protein kinase A to phosphorylate the cAMP response element binding protein (CREB). The existence of this complete and functional, nuclear-localized cAMP pathway establishes that cAMP signals in intracellular microdomains and identifies an alternate pathway leading to CREB activation. PMID:14769862

  15. Bicarbonate-responsive “soluble” adenylyl cyclase defines a nuclear cAMP microdomain

    OpenAIRE

    2004-01-01

    Bicarbonate-responsive “soluble” adenylyl cyclase resides, in part, inside the mammalian cell nucleus where it stimulates the activity of nuclear protein kinase A to phosphorylate the cAMP response element binding protein (CREB). The existence of this complete and functional, nuclear-localized cAMP pathway establishes that cAMP signals in intracellular microdomains and identifies an alternate pathway leading to CREB activation.

  16. Long-Term Memory for Place Learning Is Facilitated by Expression of cAMP Response Element-Binding Protein in the Dorsal Hippocampus

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    Brightwell, Jennifer J.; Smith, Clayton A.; Neve, Rachael L.; Colombo, Paul J.

    2007-01-01

    Extensive research has shown that the hippocampus is necessary for consolidation of long-term spatial memory in rodents. We reported previously that rats using a place strategy to solve a cross maze task showed sustained phosphorylation of hippocampus cyclic AMP response element-binding protein (CREB), a transcription factor implicated in…

  17. 14 CFR 91.1413 - CAMP: Responsibility for airworthiness.

    Science.gov (United States)

    2010-01-01

    ..., including airframes, aircraft engines, propellers, rotors, appliances, and parts. (2) Maintaining its..., including airframes, aircraft engines, propellers, rotors, appliances, emergency equipment and parts, under... Ownership Operations Program Management § 91.1413 CAMP: Responsibility for airworthiness. (a) For...

  18. Reactive oxygen species decrease cAMP response element binding protein expression in cardiomyocytes via a protein kinase D1-dependent mechanism that does not require Ser133 phosphorylation.

    Science.gov (United States)

    Ozgen, Nazira; Guo, Jianfen; Gertsberg, Zoya; Danilo, Peter; Rosen, Michael R; Steinberg, Susan F

    2009-10-01

    Reactive oxygen species (ROS) exert pleiotropic effects on a wide array of signaling proteins that regulate cellular growth and apoptosis. This study shows that long-term treatment with a low concentration of H2O2 leads to the activation of signaling pathways involving extracellular signal-regulated kinase, ribosomal protein S6 kinase, and protein kinase D (PKD) that increase cAMP binding response element protein (CREB) phosphorylation at Ser(133) in cardiomyocytes. Although CREB-Ser(133) phosphorylation typically mediates cAMP-dependent increases in CREB target gene expression, the H2O2-dependent increase in CREB-Ser(133) phosphorylation is accompanied by a decrease in CREB protein abundance and no change in Cre-luciferase reporter activity. Mutagenesis studies indicate that H2O2 decreases CREB protein abundance via a mechanism that does not require CREB-Ser(133) phosphorylation. Rather, the H2O2-dependent decrease in CREB protein is prevented by the proteasome inhibitor lactacystin, by inhibitors of mitogen-activated protein kinase kinase or protein kinase C activity, or by adenoviral-mediated delivery of a small interfering RNA that decreases PKD1 expression. A PKD1-dependent mechanism that links oxidative stress to decreased CREB protein abundance is predicted to contribute to the pathogenesis of heart failure by influencing cardiac growth and apoptosis responses.

  19. Regulation of cyclooxygenase-2 expression by cAMP response element and mRNA stability in a human airway epithelial cell line exposed to zinc

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    Exposure to zinc-laden particulate matter in ambient and occupational settings has been associated with proinflammatory responses in the lung. Cyclooxygenase 2-derived eicosanoids are important modulators of airway inflammation. In this study, we characterized the transcriptional...

  20. cAMP response element binding protein1 is essential for activation of steroyl co-enzyme a desaturase 1 (Scd1 in mouse lung type II epithelial cells.

    Directory of Open Access Journals (Sweden)

    Nisha Antony

    Full Text Available Cyclic AMP Response Element-Binding Protein 1 (Creb1 is a transcription factor that mediates cyclic adenosine 3', 5'-monophosphate (cAMP signalling in many tissues. Creb1(-/- mice die at birth due to respiratory failure and previous genome-wide microarray analysis of E17.5 Creb1(-/- fetal mouse lung identified important Creb1-regulated gene targets during lung development. The lipogenic enzymes stearoyl-CoA desaturase 1 (Scd1 and fatty acid synthase (Fasn showed highly reduced gene expression in Creb1(-/- lungs. We therefore hypothesized that Creb1 plays a crucial role in the transcriptional regulation of genes involved in pulmonary lipid biosynthetic pathways during lung development. In this study we confirmed that Scd1 and Fasn mRNA levels were down regulated in the E17.5 Creb1(-/- mouse lung while the lipogenic-associated transcription factors SrebpF1, C/ebpα and Pparγ were increased. In vivo studies using germline (Creb1(-/- and lung epithelial-specific (Creb1(EpiΔ/Δ Creb1 knockout mice showed strongly reduced Scd1, but not Fasn gene expression and protein levels in lung epithelial cells. In vitro studies using mouse MLE-15 epithelial cells showed that forskolin-mediated activation of Creb1 increased both Scd1 gene expression and protein synthesis. Additionally, MLE15 cells transfected with a dominant-negative ACreb vector blocked forskolin-mediated stimulation of Scd1 gene expression. Lipid profiling in MLE15 cells showed that dominant-negative ACreb suppressed forskolin-induced desaturation of ether linked lipids to produce plasmalogens, as well as levels of phosphatidylethanolamine, ceramide and lysophosphatidylcholine. Taken together these results demonstrate that Creb1 is essential for the induction and maintenance of Scd1 in developing fetal mouse lung epithelial cells.

  1. Effects of estrogen treatment on expression of brain-derived neurotrophic factor and cAMP response element-binding protein expression and phosphorylation in rat amygdaloid and hippocampal structures.

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    Zhou, Jin; Zhang, Huaibo; Cohen, Rochelle S; Pandey, Subhash C

    2005-01-01

    Clinical studies indicate an effect of estrogen (E2) on affect and cognition, which may be mediated by the cAMP response element-binding protein (CREB) pathway and CREB-related gene target brain-derived neurotrophic factor (BDNF). We investigated the effect of E2 on CREB expression and phosphorylation and BDNF expression in the amygdala and hippocampus, areas involved in emotional processing. Ovariectomized rats were given 10 microg 17beta-estradiol or vehicle for 14 days and expression of components of the CREB signaling pathway, i.e., CREB, phosphorylated CREB (pCREB), and BDNF in amygdala and hippocampus were investigated using immunogold labeling. Levels of BDNF mRNA were determined by in situ reverse-transcriptase polymerase chain reaction. We also examined the effect of E2 on calcium/calmodulin kinase (CaMK IV) immunolabeling in the hippocampus. E2 increased immunolabeling and mRNA levels of BDNF in the medial and basomedial amygdala and CA1 and CA3 regions of the hippocampus, but not in any other amygdaloid or hippocampal regions examined. E2 increased immunolabeling of CREB and pCREB in the medial and basomedial, but not central or basolateral amygdala. E2 also increased CaMK IV and pCREB immunolabeling in the CA1 and CA3 regions, but not CA2 region or dentate gyrus, of the hippocampus. There was no change in immunolabeling of CREB in any hippocampal region. These data identify a signaling pathway through which E2 increases BDNF expression that may underlie some actions of E2 on affective behavior and indicate neuroanatomical heterogeneity in the E2 effect within the amygdala and hippocampus.

  2. [Blockade of NMDA receptor enhances corticosterone-induced downregulation of brain-derived neurotrophic factor gene expression in the rat hippocampus through cAMP response element binding protein pathway].

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    Feng, Hao; Lu, Li-Min; Huang, Ying; Zhu, Yi-Chun; Yao, Tai

    2005-10-25

    High concentration of corticosterone leads to morphological and functional impairments in hippocampus, ranging from a reversible atrophy of pyramidal CA3 apical dendrites to the impairment of long-term potentiation (LTP) and hippocampus-dependent learning and memory. Glutamate and N-methyl-D-aspartate (NMDA) receptor play an important role in this effect. Because of the importance of brain-derived neurotrophic factor (BDNF) in the functions of the hippocampal neurons, alteration of the expression of BDNF is thought to be involved in the corticosterone effect on the hippocampus. To determine whether change in BDNF in the hippocampus is involved in the corticosterone effect, we injected corticosterone (2 mg/kg, s.c.) to Sprague-Dawley rats and measured the mRNA, proBDNF and mature BDNF protein levels in the hippocampus. We also measured the phosphorylation level of the transcription factor cAMP response element binding protein (CREB). Furthermore, we intraperitoneally injected NMDA receptor antagonist MK801 (0.1 mg/kg) 30 min before corticosterone administration to investigate whether and how MK801 affected the regulation of BDNF gene expression by corticosterone. Our results showed that 3 h after single s.c. injection of corticsterone, the expression of BDNF mRNA, proBDNF and mature BDNF protein decreased significantly (PBDNF gene expression in the rat hippocampus by corticosterone. We also found that either applying corticosterone or co-applying corticosterone with MK801 downregulated the phosphoration level of CREB, the latter (corticosterone plus MK801) being more effective (PBDNF gene expression in the rat hippocampus through CREB pathway and that blockade of NMDA receptor enhances this effect of corticosterone in reducing BDNF expression.

  3. Regulation of insulin-like growth factor I transcription by cyclic adenosine 3',5'-monophosphate (cAMP) in fetal rat bone cells through an element within exon 1: protein kinase A-dependent control without a consensus AMP response element

    Science.gov (United States)

    McCarthy, T. L.; Thomas, M. J.; Centrella, M.; Rotwein, P.

    1995-01-01

    Insulin-like growth factor I (IGF-I) is a locally synthesized anabolic growth factor for bone. IGF-I synthesis by primary fetal rat osteoblasts (Ob) is stimulated by agents that increase the intracellular cAMP concentration, including prostaglandin E2 (PGE2). Previous studies with Ob cultures demonstrated that PGE2 enhanced IGF-I transcription through selective use of IGF-I promoter 1, with little effect on IGF-I messenger RNA half-life. Transient transfection of Ob cultures with an array of promoter 1-luciferase reporter fusion constructs has now allowed localization of a potential cis-acting promoter element(s) responsible for cAMP-stimulated gene expression to the 5'-untranslated region (5'-UTR) of IGF-I exon 1, within a segment lacking a consensus cAMP response element. Our evidence derives from three principal observations: 1) a transfection construct containing only 122 nucleotides (nt) of promoter 1 and 328 nt of the 5'-UTR retained full PGE2-stimulated reporter expression; 2) maximal PGE2-driven reporter expression required the presence of nt 196 to 328 of exon 1 when tested within the context of IGF-I promoter 1; 3) cotransfection of IGF-I promoter-luciferase-reporter constructs with a plasmid encoding the alpha-isoform of the catalytic subunit of murine cAMP-dependent protein kinase (PKA) produced results comparable to those seen with PGE2 treatment, whereas cotransfection with a plasmid encoding a mutant regulatory subunit of PKA that cannot bind cAMP blocked PGE2-induced reporter expression. Deoxyribonuclease I footprinting of the 5'-UTR of exon 1 demonstrated protected sequences at HS3A, HS3B, and HS3D, three of six DNA-protein binding sites previously characterized with rat liver nuclear extracts. Of these three regions, only the HS3D binding site is located within the functionally identified hormonally responsive segment of IGF-I exon 1. These results directly implicate PKA in the control of IGF-I gene transcription by PGE2 and identify a segment of

  4. Snakes Have Feelings, Too: Elements of a Camp Snake Program.

    Science.gov (United States)

    Allen, Robert Ross

    2001-01-01

    A camp snake program can help campers overcome their fear of snakes, and people cannot truly enjoy nature when they carry a phobia about any one part of it. It can also help overcome prejudice by teaching truth and respect, instilling compassion, and helping campers develop empathy. Advice on catching, handling, identifying, keeping, and feeding…

  5. Effect of Tiantai No.1(天泰1号) on β-Amyloid-induced Neurotoxicity and NF- к B and cAMP Responsive Element-binding Protein

    Institute of Scientific and Technical Information of China (English)

    WU Zheng-zhi; Andrew C. J. Huang; Jean de Vellis; LI Ying-hong

    2008-01-01

    To investigate the effect and molecular mechanism of Tiantai No.1 (天泰1号), a compound Chinese herbal preparation, for the prevention and reduction of neurotoxicity induced by beta-element-binding protein (CREB) pathways using the gene transfection technique. Methods: B104 neuronal cells were used to examine the effects of Tiantai No.1 on lowering the neurotoxicity induced by Abeta. The cells were pre-treated with Tiantai No.1 at doses of 50, 100, 150, or 200 μg/mL respectively for 3 days and co-treated with Tiantai No.1 and beta-amyloid peptidel-40 (Aβ 1-40, 10 μmol/L) for 48 h or post-treated with Tiantai No.1 for 48 h after the cells were exposed to beta-amyloid peptides25-35 (A β 25-35) for 8 h. In gene transfection assays, cells were treated with Tiantai No.1 at 50 μg/m/and 150 μg/mL for 5 days or co-treated with Tiantai No.1 and A β 1-40 (5 μ mo/L) for 3 days after electroporation for the with Tiantai No.1 lowered the neurotoxicity induced by Abeta, and post-treating with Tiantai No.1 reduced or blocked B104 neuronal apoptotic death induced by Abeta (PcAMP cellular signal pathways.

  6. Enhancing T3 and cAMP responsive gene participation in the thermogenic regulation of fuel oxidation pathways

    OpenAIRE

    2010-01-01

    OBJECTIVE: We sought to identify glycolysis, glycogenolysis, lipolysis, Krebs cycle, respiratory chain, and oxidative phosphorylation enzymes simultaneously regulated by T3 and cAMP. MATERIALS AND METHODS: We performed in silico analysis of 56 promoters to search for cis-cAMP (CREB) and cis-thyroid (TRE) response elements, considering UCP1, SERCA2 and glyceraldehyde 3-phosphate dehydrogenase as reference. Only regulatory regions with prior in vitro validation were selected. RESULTS: 29/56 enz...

  7. Characterization of a new CAMP factor carried by an integrative and conjugative element in Streptococcus agalactiae and spreading in Streptococci.

    Directory of Open Access Journals (Sweden)

    Sarah Chuzeville

    Full Text Available Genetic exchanges between Streptococci occur frequently and contribute to their genome diversification. Most of sequenced streptococcal genomes carry multiple mobile genetic elements including Integrative and Conjugative Elements (ICEs that play a major role in these horizontal gene transfers. In addition to genes involved in their mobility and regulation, ICEs also carry genes that can confer selective advantages to bacteria. Numerous elements have been described in S. agalactiae especially those integrated at the 3' end of a tRNA(Lys encoding gene. In strain 515 of S. agalactiae, an invasive neonate human pathogen, the ICE (called 515_tRNA(Lys is functional and carries different putative virulence genes including one encoding a putative new CAMP factor in addition to the one previously described. This work demonstrated the functionality of this CAMP factor (CAMP factor II in Lactococcus lactis but also in pathogenic strains of veterinary origin. The search for co-hemolytic factors in a collection of field strains revealed their presence in S. uberis, S. dysgalactiae, but also for the first time in S. equisimilis and S. bovis. Sequencing of these genes revealed the prevalence of a species-specific factor in S. uberis strains (Uberis factor and the presence of a CAMP factor II encoding gene in S. bovis and S. equisimilis. Furthermore, most of the CAMP factor II positive strains also carried an element integrated in the tRNA(Lys gene. This work thus describes a CAMP factor that is carried by a mobile genetic element and has spread to different streptococcal species.

  8. Responsiveness to Exogenous Camp of a Saccharomyces Cerevisiae Strain Conferred by Naturally Occurring Alleles of Pde1 and Pde2

    OpenAIRE

    Mitsuzawa, H.

    1993-01-01

    The Saccharomyces cerevisiae strain P-28-24C, from which cAMP requiring mutants derived, responded to exogenously added cAMP. Upon the addition of cAMP, this strain showed phenotypes shared by mutants with elevated activity of the cAMP pathway. Genetic analysis involving serial crosses of this strain to a strain with another genetic background revealed that the responsiveness to cAMP results from naturally occurring loss-of-function alleles of PDE1 and PDE2, which encode low and high affinity...

  9. Proteomic signatures implicate cAMP in light and temperature responses in Arabidopsis thaliana

    KAUST Repository

    Thomas, Ludivine

    2013-05-01

    The second messenger 3\\'-5\\'-cyclic adenosine monophosphate (cAMP) and adenylyl cyclases (ACs), enzymes that catalyse the formation of cAMP from ATP, are increasingly recognized as important signaling molecules in a number of physiological responses in higher plants. Here we used proteomics to identify cAMP-dependent protein signatures in Arabidopsis thaliana and identify a number of differentially expressed proteins with a role in light- and temperature-dependent responses, notably photosystem II subunit P-1, plasma membrane associated cation-binding protein and chaperonin 60 β. Based on these proteomics results we conclude that, much like in cyanobacteria, algae and fungi, cAMP may have a role in light signaling and the regulation of photosynthesis as well as responses to temperature and we speculate that ACs could act as light and/or temperature sensors in higher plants. Biological significance: This current study is significant since it presents the first proteomic response to cAMP, a novel and key second messenger in plants. It will be relevant to researchers in plant physiology and in particular those with an interest in second messengers and their role in biotic and abiotic stress responses. © 2013 Elsevier B.V.

  10. Evidences for involvement of endogenous cAMP in Arabidopsis defense responses to Verticillium toxins

    Institute of Scientific and Technical Information of China (English)

    Jing JIANG; Ling Wen FAN; Wei Hua WU

    2005-01-01

    Although there were reports suggesting the involvement of endogenous cAMP in plant defense signaling cascades,there is no direct evidence supporting this notion yet and the detailed mechanism is unclear. In the present study, we have used pathogenic fungi Verticillium dahliae and Arabidopsis plants as a model system of plant-microb interaction to demonstrate the function of endogenous cAMP in Arabidopsis defense responses. Both V. dahliae inoculation and Verticillium toxins injection induced typical "wilt" symptoms in Arabidopsis seedlings. When either 8-Br-AMP (a membrane permeable cAMP analogue) or salicylic acid (SA) was applied to Arabidopsis, the plants became resistant to V. dahliae toxins. However, addition of 8-Br-AMP did not increase the resistance of Arabidopsis transgenic plants deficient in SA to the toxins, suggesting that cAMP might act upstream of SA in plant defense signaling pathway.Indeed, 8-Br-cAMP and forskolin, an activator of adenylyl cyclase, significantly stimulated the endogenous SA level in plants, whereas DDA, an inhibitor of adenylyl cyclase dramatically reduced toxin-induced SA increase. Both the endogenous cAMP and SA increased significantly in Arabidopsis seedlings treated with toxins. Furthermore, transcription level of pathogenesis-related protein 1 gene (PR1) was strongly induced by both 8-Br-cAMP and the toxin treatment. Taken together, our data demonstrate that endogenous cAMP is involved in plant defense responses against Verticilliumsecreted toxins by regulating the production of the known signal SA in plant defense pathway.

  11. Relationship between Adaptation of the Folic Acid and the cAMP Mediated cGMP Response in Dictyostelium

    NARCIS (Netherlands)

    Haastert, Peter J.M. van

    1983-01-01

    Chemotactic stimulation of post-vegetative Dictyostelium cells with folic acid or aggregative cells with cAMP results in a fast transient cGMP response which peaks at 10 s; basal levels are recovered in about 30-40 s. Stimulation with folic acid or cAMP rapidly desensitizes the cells for equal or lo

  12. [Hemophilia camps.

    Science.gov (United States)

    Juárez-Sierra, Julieta; Del Pilar Torres-Arreola, Laura; Marín-Palomares, Teresa; Dueñas-González, María Teresa; Monteros-Rincón, Martha Patricia; Osorio-Guzmán, Maricela

    2013-01-01

    We reported the experience of hemophilia camps which was accomplished with patients from hospitals of the Instituto Mexicano del Seguro Social. The aim was to prepare the families and patients regarding the disease treatment, in order to promote the self sufficiency and to know the impact of the program on the course of the disease. Surveys were applied about treatment items and personal opinions were collected. The results of the national hemophilia camp were: group of 56 patients, average 14 years, 2 % women, 51 % severe hemophilia and 43 % had hemophilic brothers. Benefits: patients increased their knowledge about earlier bleeding identification and the self-infusion method; they became aware on their responsibility in self care, timely treatment and duties at home. Hemophilia camps with patients are an option for attitude change before disease complications. Social network creation and the increase in self-sufficiency are other benefits.

  13. The cyclic AMP response element modulator regulates transcription of the TCR zeta-chain

    NARCIS (Netherlands)

    Tenbrock, K; Kyttaris, VC; Ahlmann, M; Ehrchen, JA; Tolnay, M; Melkonyan, H; Mawrin, C; Roth, J; Sorg, C; Juang, YT; Tsokos, GC

    2005-01-01

    Systemic lupus erythematusus T cells display decreased amounts of TCR zeta mRNA that results in part from limited binding of the transcriptional enhancer Elf-1 to the TCR zeta promoter. We have identified a new cis-binding site for the cAMP response element (CRE) modulator (CREM) on the TCR zeta pro

  14. Effects of ohmefentanyl stereoisomers on phosphorylation of cAMP- response element binding protein in cultured rat hippocampal neurons%羟甲芬太尼立体异构体对培养的海马神经元cAMP-反应元件结合蛋白磷酸化的影响

    Institute of Scientific and Technical Information of China (English)

    高灿; 谌立伟; 陶亦敏; 陈洁; 徐学军; 池志强

    2003-01-01

    AIM: To define the effects and signal pathways of ohmefentanyl stereoisomers [(-)-cis-(3R,4S,2'R) OMF (F9202), (+)-cis-(3R, 4S, 2′S) OMF (F9204), and (-)-cis-(3S, 4S, 2′R) OMF (F9203)] on the phosphorylation of cAMP-re sponse element binding protein (CREB) in cultured rat hippocampal neurons. METHODS: The effects of the three OMF stereoisomers and morphine (Mor) on cAMP accumulation and CREB phosphorylation were monitored by radioimmunoassay and Western blot analysis, respectively. RESULTS: The three OMF stereoisomers and Mor could all partially inhibit forskolin-stimulated (25 μmol/L, 15 min) cAMP accumulation in a dose-dependent manner and this effect could be reversed by naloxone. F9202, F9204, and Mor could significantly increase CREB phospho rylation from 2.88 to 3.59 folds over control levels after 30-min exposure. This effect was reversed by naloxone,but F9203 failed to increase CREB phosphorylation. KN-62 and staurosporine significantly blocked the opioidsinduced CREB phosphorylation, while H-89 and PD 98059 had no effect on the actions. CONCLUSION: Mor,F9202, and F9204, which could induce psychological dependence affected via the μ-opioid receptor, stimulated intracellular signal pathways involving Ca2+/calmodulin-dependent protein kinases (CCDPK) and protein kinase C (PKC) pathways, which in turn initiated CREB phosphorylation. F9203, which could not induce dependence, had no effect on CREB phosphorylation in hippocampal neurons. The increased CREB phosphorylation in hippocampal neurons may play a role in opioids dependence.

  15. The effects of high fat diet and exercise on cAMP response element binding protein gene expression in brain of mice%高脂膳食与运动对小鼠脑内cAMP反应元件结合蛋白基因表达的影响

    Institute of Scientific and Technical Information of China (English)

    云少君; 乔欣; 李蔓; 魏守刚

    2015-01-01

    目的:通过观察cAMP反应元件结合蛋白( CREB)基因表达探讨高脂膳食与运动对脑老化的影响。方法70只ICR小鼠按体重随机分为普通对照组、高脂对照组、运动对照组、普通脑老化组、脑老化+高脂组、脑老化+运动组及脑老化+高脂+运动组。造模10 w后,以 Morris水迷宫实验检测小鼠的学习记忆能力, RT-PCR检测小鼠大脑CREB基因的表达水平。结果与普通对照组相比,普通脑老化组、脑老化+高脂组、脑老化+高脂+运动组及高脂对照组小鼠脑CREB基因表达水平明显降低(P<0.05),运动对照组CREB 基因表达水平无明显变化。脑老化+运动组小鼠脑CREB基因表达水平明显高于脑老化组( P<0.05)。结论脑老化小鼠 CREB基因表达水平降低。高脂膳食下调CREB 基因的表达,具有促脑老化效应。运动可以防止脑老化小鼠CREB基因的表达下降,具有抗脑老化效应。%Objective To explore the effects of high fat diet and exercise on the expression of cAMP response element binding pro-tein( CREB) gene in brain of mice.Methods Seventy mice were randomly divided into control , high fat diet, exercise, brain aging, brain aging +high fat diet, brain aging +exercise, brain aging +high fat diet +exercise groups.The experimental duration was 10 weeks.Morris water maze test was used to measure the learning and memory ability .Reverse transcription polymerase chain reaction ( RT-PCR) was used to detect the brain CREB gene expression .Results Compared with that of control group , the CREB gene expression was decreased in brain aging mice and brain aging +high fat diet group (P<0.05).There was not significant difference of CREB gene expression between brain ag-ing+exercise group and control group .The CREB gene expression in brain aging +high fat diet +exercise group was decreased significantly compared with that of normal group , but compared with that of brain

  16. Ca2+ participates in α1B-adrenoceptor-mediated cAMP response in HEK293 cells

    Institute of Scientific and Technical Information of China (English)

    Yao SONG; Yun-fang LI; Er-dan DONG; Qi-de HAN; You-yi ZHANG

    2005-01-01

    Aim: To investigate the α1B-adrenoceptor (α1B-AR)-mediated cAMP response and underlying mechanisms in HEK293 cells. Methods: Full-length cDNA encoding α1B-AR was transfected into HEK293 cells using the calcium phosphate precipitation method, and α1B-AR expression and cAMP accumulation were determined by using the saturation radioligand binding assay and ion-exchange chromatography, respectively. Results: Under agonist stimulation, α1B-AR mediated cAMP synthesis in HEK293 cells, and blockade by PLC-PKC or tyrosine kinase did not reduce cAMP accumulation induced by NE. Pretreatment with pertussis toxin(PTX) had little effect on basal cAMP accumulation as well as norepinephrine(NE)-stimulated cAMP accumulation. In addition, pretreatment with cholera toxin(CTX) neither mimicked nor blocked the effect induced by NE. The extracellular Ca2+ chelator egtazic acid (EGTA), nonselective Ca2+ channel blocker CdC12 and calmodulin (CaM) inhibitor W-7 significantly reduced NE-induced cAMP accumulation from 1.59%±0.47% to 1.00%±0.31%, 0.78%±0.23%, and 0.90%±0.40%,respectively. Conclusion: By coupling with a PTX-insensitive G protein, α1B-AR promotes Ca2+ influx via receptor-dependent Ca2+ channels, then Ca2+ is linked to CaM to form a Ca2+-CaM complex, which stimulates adenylyl cyclase (AC),thereby increasing the cAMP production in HEK293 cell lines.

  17. Responses to intimate partner violence in Kakuma refugee camp: refugee interactions with agency systems.

    Science.gov (United States)

    Horn, Rebecca

    2010-01-01

    Intimate partner violence (IPV) has been recognised as a significant problem amongst forcibly displaced communities, and great progress has been made by the United Nations High Commission for Refugees (UNHCR) in responding to IPV and other forms of sexual and gender based violence. However, they have not always effectively engaged refugee communities in these activities, with potentially negative consequences for the health and protection of women. This study was conducted in Kakuma refugee camp, north-west Kenya. Eighteen focus group discussions were conducted with 157 refugees from various nationalities, including Sudanese, Somali, Ethiopian, and Congolese. They focused on the nature and consequences of IPV in Kakuma. The aim of this paper is to explore how refugees in Kakuma talk about the ways that IPV is dealt with, focusing particularly on the ways that community responses are said to interact with formal response systems established by UNHCR and its implementing partners. Refugees talked about using a 'hierarchy of responses' to IPV, with only particularly serious or intransigent cases reaching UNHCR or its implementing agencies. Some male refugees described being mistrustful of agency responses, because agencies were believed to favour women and to prioritise protecting the woman at all costs, even if that means separating her from the family. Whilst community responses to IPV might often be appropriate and helpful, the findings of the current study suggest that in Kakuma they do not necessarily result in the protection of women. Yet women in Kakuma are reported to be reluctant to report their cases to UNHCR and its implementing agencies. A more effective protection response from UNHCR might involve closer co-operation with individuals and structures within the refugee communities to develop a co-ordinated response to IPV.

  18. Integrating Responsive Building Elements in Buildings

    DEFF Research Database (Denmark)

    Haase, Matthias; Amato, Alex; Heiselberg, Per

    2006-01-01

    There is a global need for a more sustainable building development. About 50% of energy is used in buildings indicating that buildings provide a considerable potential for operational energy savings. Studies were conducted with the following objectives: to perform a state-of-the-art review...... energy strategies to develop guidelines and procedures for estimation of environmental performance of responsive building elements and integrated building concepts This paper introduces the ideas of this collaborative work and discusses its usefulness for Hong Kong and China. Special focus was put...... of responsive building elements, of integrated building concepts and of environmental performance assessment methods to improve and optimize responsive building elements to develop and optimize new building concepts with integration of responsive building elements, HVAC-systems as well as natural and renewable...

  19. Differential control by IHF and cAMP of two oppositely oriented genes, hpt and gcd, in Escherichia coli: significance of their partially overlapping regulatory elements.

    Science.gov (United States)

    Izu, H; Ito, S; Elias, M D; Yamada, M

    2002-01-01

    The hpt gene, which encodes hypoxanthine phosphoribosyltransferase, is located next to, but transcribed in the opposite direction to, the gcd gene, which codes for a membrane-bound glucose dehydrogenase, at 3.1 min on the Escherichia coli genome. In their promoter-operator region, putative regulatory elements for integration host factor (IHF) and for the complex comprising 3', 5'-cyclic AMP (cAMP) and its receptor protein (CRP) are present, and they overlap the promoters for hpt and gcd, respectively. The involvement of IHF and cAMP-CRP, as well as the corresponding putative cis-acting elements, in the expression of the two genes was investigated by using lacZ operon fusions. In an adenylate cyclase-deficient strain, addition of cAMP increased the expression of hpt and reduced the expression of gcd. In agreement with this observation, the introduction of mutations into the putative binding element for the cAMP-CRP complex enhanced the expression of gcd. In contrast, mutations introduced into the putative IHF-binding elements increased the level of hpt expression. Similar results were obtained with IHF-defective strains. Thus, the expression of the two genes is regulated in a mutually exclusive manner. Additional experiments with mutations at the -10 sequence of the gcd promoter suggest that the binding of RNA polymerase to the hpt promoter interferes with the interaction of RNA polymerase with the gcd promoter, and vice versa.

  20. 高脂膳食和跑台运动构建模型大鼠腓肠肌葡萄糖转运体4和 cAMP反应元件结合蛋白的变化%Effects of high-fat diet and treadmill exercise on glucose transporter 4 and cAMP response element binding protein in rat gastrocnemius muscle

    Institute of Scientific and Technical Information of China (English)

    张云丽; 蔡明; 李静静; 辛磊; 娄淑杰

    2016-01-01

    BACKGROUND:Some studies indicate that PI3K/Akt signaling pathway is associated with the expression of glucose transporter 4 (GLUT4) and the function of cAMP response element binding protein (CREB) in skeletal muscle. However, it is stil unclear whether PI3K/Akt signaling pathway has the effects on CREB and GLUT4 in skeletal muscle of the rats with high-fat diet and treadmil exercise. OBJECTIVE:To investigate whether PI3K/Akt signaling pathway has the effects on CREB and GLUT4 in gastrocnemius muscle of the rats with high-fat diet and treadmil exercise. METHODS:A total of 70 rats were fed with normal diet for 2 weeks, and randomly divided into common feed group (n=20) and high-fat feed group (n=50). Rats in both groups were respectively fed with common feed and high-fat feed for 8 weeks. The rats in the common feed group were equaly assigned to common feed quiet group and common feed exercise group. 20 rats from the high-fat feed group whose body weight was 1.4 times of common rats were randomly and equaly assigned to obese quiet group and obese exercise group. Rats in the quiet groups did not do exercises. Rats in the exercise groups received adaptive sports for 1 week and medium-intensity treadmil exercise for 8 weeks. RESULTS AND CONCLUSION:(1) Impairments of PI3K/Akt signaling pathway appeared in obese rats, however, the quantity of GLUT4 expression did not change obviously in gastrocnemius muscles of obese rats. The reasons for the decrease of the nuclear protein CREB level of gastrocnemius muscles of obese rats might be related to the decrease of pAkt-Ser473 level. (2) The increase of the quantity of GLUT4 expression was accompanied by significantly up-regulated pAkt-Ser473 level by exercise intervention in gastrocnemius muscles of obese rats. Exercise intervention significantly increased the expression of nuclear protein CREB in gastrocnemius muscles of chow-fed rats and obese rats, which was consistent with the changes of pAkt-Ser473. These findings suggest

  1. Composite structure of auxin response elements.

    Science.gov (United States)

    Ulmasov, T; Liu, Z B; Hagen, G; Guilfoyle, T J

    1995-10-01

    The auxin-responsive soybean GH3 gene promoter is composed of multiple auxin response elements (AuxREs), and each AuxRE contributes incrementally to the strong auxin inducibility to the promoter. Two independent AuxREs of 25 bp (D1) and 32 bp (D4) contain the sequence TGTCTC. Results presented here show that the TGTCTC element in D1 and D4 is required but not sufficient for auxin inducibility in carrot protoplast transient expression assays. Additional nucleotides upstream of TGTCTC are also required for auxin inducibility. These upstream sequences showed constitutive activity and no auxin inducibility when part or all of the TGTCTC element was mutated or deleted. In D1, the constitutive element overlaps the 5' portion of TGTCTC; in D4, the constitutive element is separated from TGTCTC. An 11-bp element in D1, CCTCGTGTCTC, conferred auxin inducibility to a minimal cauliflower mosaic virus 35S promoter in transgenic tobacco seedlings as well as in carrot protoplasts (i.e., transient expression assays). Both constitutive elements bound specifically to plant nuclear proteins, and the constitutive element in D1 bound to a recombinant soybean basic leucine zipper transcription factor with G-box specificity. To demonstrate further the composite nature of AuxREs and the ability of the TGTCTC element to confer auxin inducibility, we created a novel AuxRE by placing a yeast GAL4 DNA binding site adjacent to the TGTCTC element. Expression of a GAL4-c-Rel transactivator in the presence of this novel AuxRE resulted in auxin-inducible expression. Our results indicate that at least some AuxREs have a composite structure consisting of a constitutive element adjacent to a conserved TGTCTC element that confers auxin inducibility.

  2. Increases in cAMP, MAPK Activity and CREB Phosphorylation during REM Sleep: Implications for REM Sleep and Memory Consolidation

    OpenAIRE

    Luo, Jie; Phan, Trongha X.; Yang, Yimei; Garelick, Michael G.; Storm, Daniel R.

    2013-01-01

    The cyclic adenosine monophosphate (cAMP), mitogen-activated protein kinase (MAPK) and cAMP response element-binding protein (CREB) transcriptional pathway is required for consolidation of hippocampus-dependent memory. In mice, this pathway undergoes a circadian oscillation required for memory persistence that reaches a peak during the daytime. Since mice exhibit polyphasic sleep patterns during the day, this suggested the interesting possibility that cAMP, MAPK activity and CREB phosphorylat...

  3. Can packaging elements elicit consumers’ emotional responses?

    DEFF Research Database (Denmark)

    Liao, Lewis; Corsi, Armando; Lockshin, Larry;

    Emotion has been an important concept in many areas of consumer research such as judgment, decision-making and advertising. Little research has been done on emotion in packaging adopting the physiological measures used in other areas. This paper draws on past studies in advertising that measure....... The results show that packaging can elicit an emotional response via different elements. The paper also raises concerns about the accuracy of using selfreport measures of emotional responses to packaging research....

  4. Effects of valproate sodium on phosphorylatted cAMP responsive element binding protein after hippocampal neuronal epileptiform discharge in rat%丙戊酸钠对大鼠海马神经元癫痫样放电后P-CREB1表达的影响

    Institute of Scientific and Technical Information of China (English)

    刘华; 徐祖才; 陈阳美

    2009-01-01

    目的:研究丙戊酸钠对大鼠海马神经元癫痫样放电后磷酸化腺感苷反应元件结合蛋白1(Phosphorylated cAMP responsiveelement binding protein1,P-CREB1)表达的影响.方法:wistar新生鼠,迅速断头取脑,体外培养海马神经元,建立神经元癫痫样放电模型.将神经元分为空白组、模型组、丙戊酸钠低剂量(50 mg/L)组、丙戊酸钠高剂量(100 mg/L)组,运用免疫荧光技术观察P-CREB1在神经元癫痫样放电后在细胞内的表达部位,采用wester blot技术测定P-CREB1在不同分组中的表达强度.结果:通过免疫荧光技术,在各组中都可以看到P-CREB1在细胞核内表达,以模型组最明显;运用Western blot,发现表达趋势与免疫荧光一致,并且,给予丙戊酸钠后,P-CREB1表达减弱,且高剂量组与低剂量组之间差异有统计学意义(P<0.05).结论:海马神经元无镁处理后呈癫痫样放电,同时P-CREB1被过度激活,而有效浓度的丙戊酸钠可抑制此反应P-CREB1的磷酸化水平.

  5. Spatial Memory in the Morris Water Maze and Activation of Cyclic AMP Response Element-Binding (CREB) Protein within the Mouse Hippocampus

    Science.gov (United States)

    Porte, Yves; Buhot, Marie Christine; Mons, Nicole E.

    2008-01-01

    We investigated the spatio-temporal dynamics of learning-induced cAMP response element-binding protein activation/phosphorylation (pCREB) in mice trained in a spatial reference memory task in the water maze. Using immunohistochemistry, we examined pCREB immunoreactivity (pCREB-ir) in hippocampal CA1 and CA3 and related brain structures. During the…

  6. BARRIERS RESPONSIBLE FOR DELAYED UTILIZATION OF CATARACT SURGERY: AN EYE CAMP STUDY FROM CENTRAL INDIA

    Directory of Open Access Journals (Sweden)

    Umesh

    2014-03-01

    Full Text Available INTRODUCTION: Blindness is one of the significant social problems in India with 7 million of the total 45 million blind people in the world residing in our country. Apart from health and status of vision, there are many other socio-economic factors and perceptions, which influence the decision making of the people for getting operated for cataract. But very few studies have been done on the social factors influencing the utilization of cataract surgery. MATERIAL AND METHODS: It was a hospital-based, descriptive study. The study subjects were recruited from the Ophthalmology department from cataract camp held in Chirayu medical College, Hospital during October 2013 to January 2014. RESULTS: In present study, insufficient family income and no one to accompany (60% and 10% was responded by majority of the subjects. In present study, the barriers for delayed utilization of cataract surgery like could manage to do daily work was responded by 513 (85.5% out of total 600 subjects, could see with the other eye clearly 470 (78.3%, busy with work 118 (19.6%, being female70 (11.6%, fear of surgery 115 (19.1%, old age 200 (33.3%, fear that surgery could lead to loss of eyesight 55 (9.1%, it was Gods will 35 (5.8%, fear about the cost of surgery 375 (62.5% and fear that surgery could lead to death was responded by 15 (2.5% out of total 600 subjects. CONCLUSION: Expansion of outreach programmes to different communities rather than concentrate in urban areas, and offering cataract surgical services at affordable rates will also be of help. Health Education has a great role to play as well, especially in creating awareness. Adequate dissemination of information through various media is usually will be very helpful

  7. Delineating the core regulatory elements crucial for directed cell migration by examining folic-acid-mediated responses.

    Science.gov (United States)

    Srinivasan, Kamalakkannan; Wright, Gus A; Hames, Nicole; Housman, Max; Roberts, Alayna; Aufderheide, Karl J; Janetopoulos, Chris

    2013-01-01

    Dictyostelium discoideum shows chemotaxis towards folic acid (FA) throughout vegetative growth, and towards cAMP during development. We determined the spatiotemporal localization of cytoskeletal and signaling molecules and investigated the FA-mediated responses in a number of signaling mutants to further our understanding of the core regulatory elements that are crucial for cell migration. Proteins enriched in the pseudopods during chemotaxis also relocalize transiently to the plasma membrane during uniform FA stimulation. In contrast, proteins that are absent from the pseudopods during migration redistribute transiently from the PM to the cytosol when cells are globally stimulated with FA. These chemotactic responses to FA were also examined in cells lacking the GTPases Ras C and G. Although Ras and phosphoinositide 3-kinase activity were significantly decreased in Ras G and Ras C/G nulls, these mutants still migrated towards FA, indicating that other pathways must support FA-mediated chemotaxis. We also examined the spatial movements of PTEN in response to uniform FA and cAMP stimulation in phospholipase C (PLC) null cells. The lack of PLC strongly influences the localization of PTEN in response to FA, but not cAMP. In addition, we compared the gradient-sensing behavior of polarized cells migrating towards cAMP to that of unpolarized cells migrating towards FA. The majority of polarized cells make U-turns when the cAMP gradient is switched from the front of the cell to the rear. Conversely, unpolarized cells immediately extend pseudopods towards the new FA source. We also observed that plasma membrane phosphatidylinositol 3,4,5-trisphosphate [PtdIns(3,4,5)P3] levels oscillate in unpolarized cells treated with Latrunculin-A, whereas polarized cells had stable plasma membrane PtdIns(3,4,5)P3 responses toward the chemoattractant gradient source. Results were similar for cells that were starved for 4 hours, with a mixture of polarized and unpolarized cells responding

  8. Integrating Environmentally Responsive Elements in Buildings

    DEFF Research Database (Denmark)

    Heiselberg, Per; Andresen, Inger; Perino, Marco;

    2006-01-01

    Significant improvement have been achieved on efficiency improvements of specific building elements like the building envelope and building equipment and services and whilst most building elements still offer opportunities for efficiency improvements, the greatest future potential lie with techno...

  9. Changes in the Arabidopsis thaliana Proteome Implicate cAMP in Biotic and Abiotic Stress Responses and Changes in Energy Metabolism

    Directory of Open Access Journals (Sweden)

    May Alqurashi

    2016-06-01

    Full Text Available The second messenger 3′,5′-cyclic adenosine monophosphate (cAMP is increasingly recognized as having many different roles in plant responses to environmental stimuli. To gain further insights into these roles, Arabidopsis thaliana cell suspension culture was treated with 100 nM of cell permeant 8-bromo-cAMP for 5 or 10 min. Here, applying mass spectrometry and comparative proteomics, 20 proteins were identified as differentially expressed and we noted a specific bias in proteins with a role in abiotic stress, particularly cold and salinity, biotic stress as well as proteins with a role in glycolysis. These findings suggest that cAMP is sufficient to elicit specific stress responses that may in turn induce complex changes to cellular energy homeostasis.

  10. Changes in the Arabidopsis thaliana Proteome Implicate cAMP in Biotic and Abiotic Stress Responses and Changes in Energy Metabolism

    KAUST Repository

    Alquraishi, May Majed

    2016-06-01

    The second messenger 3′,5′-cyclic adenosine monophosphate (cAMP) is increasingly recognized as having many different roles in plant responses to environmental stimuli. To gain further insights into these roles, Arabidopsis thaliana cell suspension culture was treated with 100 nM of cell permeant 8-bromo-cAMP for 5 or 10 min. Here, applying mass spectrometry and comparative proteomics, 20 proteins were identified as differentially expressed and we noted a specific bias in proteins with a role in abiotic stress, particularly cold and salinity, biotic stress as well as proteins with a role in glycolysis. These findings suggest that cAMP is sufficient to elicit specific stress responses that may in turn induce complex changes to cellular energy homeostasis.

  11. cAMP and EPAC are key players in the regulation of the signal transduction pathway involved in the α-hemolysin autophagic response.

    Directory of Open Access Journals (Sweden)

    María Belén Mestre

    Full Text Available Staphylococcus aureus is a microorganism that causes serious diseases in the human being. This microorganism is able to escape the phagolysosomal pathway, increasing intracellular bacterial survival and killing the eukaryotic host cell to spread the infection. One of the key features of S. aureus infection is the production of a series of virulence factors, including secreted enzymes and toxins. We have shown that the pore-forming toxin α-hemolysin (Hla is the S. aureus-secreted factor responsible for the activation of the autophagic pathway and that this response occurs through a PI3K/Beclin1-independent form. In the present report we demonstrate that cAMP has a key role in the regulation of this autophagic response. Our results indicate that cAMP is able to inhibit the autophagy induced by Hla and that PKA, the classical cAMP effector, does not participate in this regulation. We present evidence that EPAC and Rap2b, through calpain activation, are the proteins involved in the regulation of Hla-induced autophagy. Similar results were obtained in cells infected with different S. aureus strains. Interestingly, in this report we show, for the first time to our knowledge, that both EPAC and Rap2b are recruited to the S. aureus-containing phagosome. We believe that our findings have important implications in understanding innate immune processes involved in intracellular pathogen invasion of the host cell.

  12. Comparison of work motivation in camp supervisors and camp counselors in Greek private camps

    Directory of Open Access Journals (Sweden)

    George Costa

    2008-06-01

    Full Text Available The purpose of this study was twofold. First, the study sought to better understand the work motivators that led camp supervisors and counselors to accept their job. Second, the study sought to better understand the ranking and rating of 20 work motivators from supervisors and camp counselors. Responders to the research questionnaire (n=121 were camp supervisory staff and counselors, age 15-55, working in seven private camps in Greece. Two instruments were used to collect data. The first instrument collected demographic data while the second instrument focused on ranking and rating 20 work motivators. The study suggested that Herzberg's theory (Motivator / Hygiene does not apply on a full scale. The results suggested that supervisory staff indicated good working conditions, meeting other people and carrying out personal growth are important. In addition, they don't like travel and don't consider working in a camp, as a stable job. The camp counselors want to have fun in their job and the opportunity to work with youth. They also don't consider working in a camp, as a stable job and they don't accept the responsibility in proportion to their position.

  13. Thresholds in shock response across the elements

    Science.gov (United States)

    Bourne, F. L.; Bourne, N. K.

    2017-01-01

    Compendia of shock data have been assembled across national laboratories across the world. Previous work has shown a threshold in behaviour for materials; the weak shock limit. This corresponds to the stress state at which the shock is overdriven in a single front. Here the shock velocity-particle velocity data for elements and compounds has been systematically analysed to note discontinuities in the data. A range of materials show such features and the form of the discontinuity in each case is analysed. Some of these are found to correspond to martensitic phase transformations as expected whilst others are more difficult to classify. Particular groups within the elements show characteristic forms according to their groupings within the periodic table. Typical datasets are presented and trends in behaviour are noted for a range of elements.

  14. Ablative Thermal Response Analysis Using the Finite Element Method

    Science.gov (United States)

    Dec John A.; Braun, Robert D.

    2009-01-01

    A review of the classic techniques used to solve ablative thermal response problems is presented. The advantages and disadvantages of both the finite element and finite difference methods are described. As a first step in developing a three dimensional finite element based ablative thermal response capability, a one dimensional computer tool has been developed. The finite element method is used to discretize the governing differential equations and Galerkin's method of weighted residuals is used to derive the element equations. A code to code comparison between the current 1-D tool and the 1-D Fully Implicit Ablation and Thermal Response Program (FIAT) has been performed.

  15. Seafloor Science and Remotely Operated Vehicle (SSROV) Day Camp: A Week-Long, Hands-On STEM Summer Camp

    Science.gov (United States)

    Wheat, C. G.; Fournier, T.; Monahan, K.; Paul, C.

    2015-12-01

    RETINA (Robotic Exploration Technologies IN Astrobiology) has developed a program geared towards stimulating our youth with innovative and relevant hands-on learning modules under a STEM umbrella. Given the breadth of potential science and engineering topics that excite children, the RETINA Program focuses on interactive participation in the design and development of simple robotic and sensor systems, providing a range of challenges to engage students through project-based learning (PBL). Thus, young students experience scientific discovery through the use and understanding of technology. This groundwork serves as the foundation for SSROV Camp, a week-long, summer day camp for 6th-8th grade students. The camp is centered on the sensors and platforms that guide seafloor exploration and discovery and builds upon the notion that transformative discoveries in the deep sea result from either sampling new environments or making new measurements with sensors adapted to this extreme environment. These technical and scientific needs are folded into the curriculum. Each of the first four days of the camp includes four team-based, hands-on technical challenges, communication among peer groups, and competition. The fifth day includes additional activities, culminating in camper-led presentations to describe a planned mission based on a given geologic setting. Presentations include hypotheses, operational requirements and expected data products. SSROV Camp was initiated last summer for three sessions, two in Monterey, CA and one in Oxford, MS. Campers from both regions grasped key elements of the program, based on written responses to questions before and after the camp. On average, 32% of the pre-test questions were answered correctly compared with 80% of the post-test questions. Additional confirmation of gains in campers' knowledge, skills, and critical thinking on environmental issues and engineering problems were apparent during the "jeopardy" competition, nightly homework

  16. Finite Element Modeling of the Buckling Response of Sandwich Panels

    Science.gov (United States)

    Rose, Cheryl A.; Moore, David F.; Knight, Norman F., Jr.; Rankin, Charles C.

    2002-01-01

    A comparative study of different modeling approaches for predicting sandwich panel buckling response is described. The study considers sandwich panels with anisotropic face sheets and a very thick core. Results from conventional analytical solutions for sandwich panel overall buckling and face-sheet-wrinkling type modes are compared with solutions obtained using different finite element modeling approaches. Finite element solutions are obtained using layered shell element models, with and without transverse shear flexibility, layered shell/solid element models, with shell elements for the face sheets and solid elements for the core, and sandwich models using a recently developed specialty sandwich element. Convergence characteristics of the shell/solid and sandwich element modeling approaches with respect to in-plane and through-the-thickness discretization, are demonstrated. Results of the study indicate that the specialty sandwich element provides an accurate and effective modeling approach for predicting both overall and localized sandwich panel buckling response. Furthermore, results indicate that anisotropy of the face sheets, along with the ratio of principle elastic moduli, affect the buckling response and these effects may not be represented accurately by analytical solutions. Modeling recommendations are also provided.

  17. Contingency Base Camp Operations and Management: Staffing and Organization

    Science.gov (United States)

    2013-09-17

    in a low-intensity conflict such as peacekeeping. The military devel- oped a number of enduring base camps such as Camp Bondsteel in Kosovo and Camp...works and engineering support All base camps require provision of potable water, waste water collection and treatment, solid waste collection and...IBCT (TF Red Bulls). Because the BCT also had responsibility for their International Security Assistance Force (ISAF) mission outside the wire

  18. Eviprostat Activates cAMP Signaling Pathway and Suppresses Bladder Smooth Muscle Cell Proliferation

    Directory of Open Access Journals (Sweden)

    Masayuki Takeda

    2013-06-01

    Full Text Available Eviprostat is a popular phytotherapeutic agent for the treatment of lower urinary tract symptoms (LUTS. At present, the signaling mechanisms underlying its therapeutic effects are still poorly understood. Given that cAMP has been reported to suppress cell hyperplasia and hypertrophy in various pathological situations, we asked whether the effect of Eviprostat could be ascribed to the activation of the cAMP signaling pathway. In the study, exposure of cAMP response element (CRE-secreted alkaline phosphatase (SEAP (CRE-SEAP-reporter cells to Eviprostat elevated SEAP secretion, which was associated with an increased phosphorylation of vasodilator-stimulated phosphoprotein (VASP and cAMP-response element-binding protein (CREB, as well as enhanced expression of CRE-regulated protein connexin43, indicating an activation of the cAMP signaling pathway. Consistent with these observations, Eviprostat-induced expression of Cx43 was abolished in the presence of adenylyl cyclase inhibitor SQ22536 or PKA inhibitor H89, whereas it was mimicked by adenylyl cyclase activator, forskolin. Further analysis demonstrated that Eviprostat significantly potentiated the effect of phosphodiesterase 3 (PDE3 inhibitor, but not that of PDE4 inhibitor, on CRE activation. Moreover, Eviprostat suppressed PDGF-induced activation of ERK and Akt and inhibited cell proliferation and hillock formation in both mesangial cells and bladder smooth muscle cells. Collectively, activation of the cAMP signaling pathway could be an important mechanism by which Eviprostat exerts its therapeutic effects for LUTS.

  19. Finite Element Model Updating Using Response Surface Method

    CERN Document Server

    Marwala, Tshilidzi

    2007-01-01

    This paper proposes the response surface method for finite element model updating. The response surface method is implemented by approximating the finite element model surface response equation by a multi-layer perceptron. The updated parameters of the finite element model were calculated using genetic algorithm by optimizing the surface response equation. The proposed method was compared to the existing methods that use simulated annealing or genetic algorithm together with a full finite element model for finite element model updating. The proposed method was tested on an unsymmetri-cal H-shaped structure. It was observed that the proposed method gave the updated natural frequen-cies and mode shapes that were of the same order of accuracy as those given by simulated annealing and genetic algorithm. Furthermore, it was observed that the response surface method achieved these results at a computational speed that was more than 2.5 times as fast as the genetic algorithm and a full finite element model and 24 ti...

  20. Lesbian camp: An unearthing.

    Science.gov (United States)

    Nielsen, Elly-Jean

    2016-01-01

    Camp-a sensibility, a style, and a form of artistic self-expression-is an elusive concept said to be in the eye of the beholder. To refute Susan Sontag's ( 1966 ) claims that camp is apolitical and not especially homosexual, a number of recent scholarly works have been geared toward revealing camp's fundamental gayness. With the odd footnote aside, lesbian camp has been collapsed into the category of gay male camp, if not eclipsed entirely. Despite the negligible efforts made to legitimize lesbian camp, there are numerous salient cultural examples one might draw on to illustrate, typify, and substantiate a lesbian camp sensibility. I lay the ground work for this scholarly exercise by outlining various definitions and critiques of camp, and by discussing its history and application to queer theory. Then, to unveil lesbian camp, three non-mutually exclusive categories are discussed: classic, erotic, and radical. By gathering various strands of inquiry, and various textual examples (e.g., photography, artistic performances, and literary tropes), this article attempts to reach a more inclusive and nuanced understanding of lesbian camp.

  1. Mechanisms of extracellular signal-regulated kinase/cAMP response element-binding protein/brain-derived neurotrophic factor signaltransduction pathway in depressive disorder

    Institute of Scientific and Technical Information of China (English)

    Hongyan Wang; Yingquan Zhang; Mingqi Qiao

    2013-01-01

    The extracellular signal-regulated kinase/cAMP response element-binding protein/brain-derived neurotrophic factor signal transduction pathway plays an important role in the mechanism of action of antidepressant drugs and has dominated recent studies on the pathogenesis of depression. In the present review we summarize the known roles of extracellular signal-regulated kinase, cAMP response element-binding protein and brain-derived neurotrophic factor in the pathogenesis of depression and in the mechanism of action of antidepressant medicines. The extracellular signal-regulated kinase/cAMP response element-binding protein/brain-derived neurotrophic factor pathway has potential to be used as a biological index to help diagnose depression, and as such it is considered as an important new target in the treatment of depression.

  2. Mechanisms of extracellular signal-regulated kinase/cAMP response element-binding protein/brain-derived neurotrophic factor signal transduction pathway in depressive disorder.

    Science.gov (United States)

    Wang, Hongyan; Zhang, Yingquan; Qiao, Mingqi

    2013-03-25

    The extracellular signal-regulated kinase/cAMP response element-binding protein/brain-derived neurotrophic factor signal transduction pathway plays an important role in the mechanism of action of antidepressant drugs and has dominated recent studies on the pathogenesis of depression. In the present review we summarize the known roles of extracellular signal-regulated kinase, cAMP response element-binding protein and brain-derived neurotrophic factor in the pathogenesis of depression and in the mechanism of action of antidepressant medicines. The extracellular signal-regulated kinase/cAMP response element-binding protein/brain-derived neurotrophic factor pathway has potential to be used as a biological index to help diagnose depression, and as such it is considered as an important new target in the treatment of depression.

  3. Tying the Design of Your Camp Staff Training to the Delivery of Desired Youth Outcomes

    Science.gov (United States)

    Galloway, Robin; Bourdeau, Virginia; Arnold, Mary; Nott, Brooke D.

    2013-01-01

    As experience camp directors, we've seen the challenges faced by young camp counselors and inexperienced staff. Evaluations from staff at many camps motivated us to help our people be more effective with their campers. In response we created a comprehensive camp staff training. Lessons showed staff what we wanted them to do and say as they…

  4. Recreation Summer Camps 2016

    Data.gov (United States)

    Montgomery County of Maryland — List of all Camps (Register here:https://apm.activecommunities.com/montgomerycounty/Home) to include Aquatics, Basketball, Soccer, Special Interest, General Sports,...

  5. Registration Summer Camp 2016

    CERN Multimedia

    2016-01-01

    Reminder: registration for the CERN Staff Association Summer Camp is now open for children from 4 to 6 years old.   More information on the website: http://nurseryschool.web.cern.ch/. The summer camp is open to all children. The proposed cost is 480.-CHF/week, lunch included. The camp will be open weeks 27, 28, 29 and 30, from 8:30 a.m. to 5:30 p.m. For further questions, you are welcome to contact us by email at Summer.Camp@cern.ch. CERN Staff Association

  6. Summer Camp July 2017 - Registration

    CERN Multimedia

    EVE et École

    2017-01-01

    The CERN Staff Association’s Summer Camp will be open for children from 4 to 6 years old during four weeks, from 3 to 28 July. Registration is offered on a weekly basis for 450 CHF, lunch included. This year, the various activities will revolve around the theme of the Four Elements. Registration opened on 20 March 2017 for children currently attending the EVE and School of the Association. It will be open from 3 April for children of CERN Members of Personnel, and starting from 24 April for all other children. The general conditions are available on the website of the EVE and School of CERN Staff Association: http://nurseryschool.web.cern.ch. For further questions, please contact us by email at Summer.Camp@cern.ch.

  7. Nonlinear analysis of the forced response of structural elements

    Science.gov (United States)

    Nayfeh, A. H.; Mook, D. T.; Sridhar, S.

    1974-01-01

    A general procedure is presented for the nonlinear analysis of the forced response of structural elements to harmonic excitations. Internal resonances (i.e., modal interactions) are taken into account. All excitations are considered, with special consideration given to resonant excitations. The general procedure is applied to clamped-hinged beams. The results reveal that exciting a higher mode may lead to a larger response in a lower interacting mode, contrary to the results of linear analyses.

  8. Finite element estimation of acoustical response functions in HID lamps

    Energy Technology Data Exchange (ETDEWEB)

    Baumann, Bernd; Wolff, Marcus [Department of Mechanical Engineering and Production, School of Engineering and Computer Science, Hamburg University of Applied Sciences, Berliner Tor 21, 20099 Hamburg (Germany); Hirsch, John; Antonis, Piet [Philips Lighting BV, Lightlabs, Mathildelaan 1, 5600 JM Eindhoven (Netherlands); Bhosle, Sounil [Universite de Toulouse (United States); Barrientos, Ricardo Valdivia, E-mail: bernd.baumann@haw-hamburg.d [National Nuclear Research Institute, Highway Mexico-Toluca s/n, La Marquesa, Ocoyoacac, CP 52750 (Mexico)

    2009-11-21

    High intensity discharge lamps can experience flickering and even destruction when operated at high frequency alternating current. The cause of these problems has been identified as acoustic resonances inside the lamp's arc tube. Here, a finite element approach for the calculation of the acoustic response function is described. The developed model does not include the plasma dynamics.

  9. Finite Element Vibration and Dynamic Response Analysis of Engineering Structures

    Directory of Open Access Journals (Sweden)

    Jaroslav Mackerle

    2000-01-01

    Full Text Available This bibliography lists references to papers, conference proceedings, and theses/dissertations dealing with finite element vibration and dynamic response analysis of engineering structures that were published from 1994 to 1998. It contains 539 citations. The following types of structures are included: basic structural systems; ground structures; ocean and coastal structures; mobile structures; and containment structures.

  10. Mechanisms of lung neutrophil activation after hemorrhage or endotoxemia: roles of reactive oxygen intermediates, NF-kappa B, and cyclic AMP response element binding protein.

    Science.gov (United States)

    Shenkar, R; Abraham, E

    1999-07-15

    Acute inflammatory lung injury occurs frequently in the setting of severe infection or blood loss. Accumulation of activated neutrophils in the lungs and increased pulmonary proinflammatory cytokine levels are major characteristics of acute lung injury. In the present experiments, we examined mechanisms leading to neutrophil accumulation and activation in the lungs after endotoxemia or hemorrhage. Levels of IL-1 beta, TNF-alpha, and macrophage inflammatory protein-2 mRNA were increased in lung neutrophils from endotoxemic or hemorrhaged mice compared with those present in lung neutrophils from control mice or in peripheral blood neutrophils from endotoxemic, hemorrhaged, or control mice. The transcriptional regulatory factors NF-kappa B and cAMP response element binding protein were activated in lung but not blood neutrophils after hemorrhage or endotoxemia. Xanthine oxidase inhibition, achieved by feeding allopurinol or tungsten-containing diets, did not affect neutrophil trafficking to the lungs after hemorrhage or endotoxemia. Xanthine oxidase inhibition did prevent hemorrhage- but not endotoxemia-induced increases in proinflammatory cytokine expression among lung neutrophils. Hemorrhage- or endotoxemia-associated activation of NF-kappa B in lung neutrophils was not affected by inhibition of xanthine oxidase. cAMP response element binding protein activation was increased after hemorrhage, but not endotoxemia, in mice fed xanthine oxidase-inhibiting diets. Our results indicate that xanthine oxidase modulates cAMP response element binding protein activation and proinflammatory cytokine expression in lung neutrophils after hemorrhage, but not endotoxemia. These findings suggest that the mechanisms leading to acute inflammatory lung injury after hemorrhage differ from those associated with endotoxemia.

  11. Scrum Code Camps

    DEFF Research Database (Denmark)

    Pries-Heje, Jan; Pries-Heje, Lene; Dahlgaard, Bente

    2013-01-01

    is required. In this paper we present the design of such a new approach, the Scrum Code Camp, which can be used to assess agile team capability in a transparent and consistent way. A design science research approach is used to analyze properties of two instances of the Scrum Code Camp where seven agile teams...

  12. Orienteering in Camping.

    Science.gov (United States)

    Larson, Elston F.

    One of the recent developments in camping is "orienteering", a program using a map and compass. Orienteering can be dovetailed into an overall camping program and used to "point up" the entire program, or it can be confined to a single simple game. The arrangement depends on the situation. The minimum age of the participants should be about 9 or…

  13. Camp's "Disneyland" Effect.

    Science.gov (United States)

    Renville, Gary

    1999-01-01

    Describes the positive mental, physical, and social growth impacts that the camping experience had on the author, and urges camp program evaluation to plan and implement such changes. Sidebar lists steps of effective evaluation: program goals and objectives, goals of evaluation, implementation of evaluation, data analysis, and findings and…

  14. Friends' Discovery Camp

    Science.gov (United States)

    Seymour, Seth

    2008-01-01

    This article features Friends' Discovery Camp, a program that allows children with and without autism spectrum disorder to learn and play together. In Friends' Discovery Camp, campers take part in sensory-rich experiences, ranging from hands-on activities and performing arts to science experiments and stories teaching social skills. Now in its 7th…

  15. Vision, Leadership, and Change: The Case of Ramah Summer Camps

    Science.gov (United States)

    Reimer, Joseph

    2010-01-01

    In his retrospective essay, Seymour Fox (1997) identified "vision" as the essential element that shaped the Ramah camp system. I will take a critical look at Fox's main claims: (1) A particular model of vision was essential to the development of Camp Ramah; and (2) That model of vision should guide contemporary Jewish educators in creating Jewish…

  16. Parallel finite element modeling of earthquake ground response and liquefaction

    Institute of Scientific and Technical Information of China (English)

    Jinchi Lu(陆金池); Jun Peng(彭军); Ahmed Elgamal; Zhaohui Yang(杨朝晖); Kincho H. Law

    2004-01-01

    Parallel computing is a promising approach to alleviate the computational demand in conducting large-scale finite element analyses. This paper presents a numerical modeling approach for earthquake ground response and liquefaction using the parallel nonlinear finite element program, ParCYCLIC, designed for distributed-memory message-passing parallel computer systems. In ParCYCLIC, finite elements are employed within an incremental plasticity, coupled solid-fluid formulation. A constitutive model calibrated by physical tests represents the salient characteristics of sand liquefaction and associated accumulation of shear deformations. Key elements of the computational strategy employed in ParCYCLIC include the development of a parallel sparse direct solver, the deployment of an automatic domain decomposer, and the use of the Multilevel Nested Dissection algorithm for ordering of the finite element nodes. Simulation results of centrifuge test models using ParCYCLIC are presented. Performance results from grid models and geotechnical simulations show that ParCYCLIC is efficiently scalable to a large number of processors.

  17. Finite Element Response Sensitivity Analysis: a comparison between force-based and Displacement-Based Frame Element Models

    OpenAIRE

    Barbato, Michele; Conte, J P

    2005-01-01

    This paper focuses on a comparison between displacement-based and force-based elements for static and dynamic response sensitivity analysis of frame type structures. Previous research has shown that force-based frame elements are superior to classical displacement-based elements enabling, at no significant additional computational costs, a drastic reduction in the number of elements required for a given level of accuracy in the simulated response. The present work shows that this advantage of...

  18. Hitler's Death Camps.

    Science.gov (United States)

    Wieser, Paul

    1995-01-01

    Presents a high school lesson on Hitler's death camps and the widespread policy of brutality and oppression against European Jews. Includes student objectives, instructional procedures, and a chart listing the value of used clothing taken from the Jews. (CFR)

  19. CDC Disease Detective Camp

    Centers for Disease Control (CDC) Podcasts

    2010-08-02

    The CDC Disease Detective Camp gives rising high school juniors and seniors exposure to key aspects of the CDC, including basic epidemiology, infectious and chronic disease tracking, public health law, and outbreak investigations. The camp also helps students explore careers in public health.  Created: 8/2/2010 by Centers for Disease Control and Prevention (CDC).   Date Released: 8/2/2010.

  20. Spectral response of multi-element silicon detectors

    Energy Technology Data Exchange (ETDEWEB)

    Ludewigt, B.A.; Rossington, C.S.; Chapman, K. [Univ. of California, Berkeley, CA (United States)

    1997-04-01

    Multi-element silicon strip detectors, in conjunction with integrated circuit pulse-processing electronics, offer an attractive alternative to conventional lithium-drifted silicon Si(Li) and high purity germanium detectors (HPGe) for high count rate, low noise synchrotron x-ray fluorescence applications. One of the major differences between the segmented Si detectors and the commercially available single-element Si(Li) or HPGe detectors is that hundreds of elements can be fabricated on a single Si substrate using standard silicon processing technologies. The segmentation of the detector substrate into many small elements results in very low noise performance at or near, room temperature, and the count rate of the detector is increased many-fold due to the multiplication in the total number of detectors. Traditionally, a single channel of detector with electronics can handle {approximately}100 kHz count rates while maintaining good energy resolution; the segmented detectors can operate at greater than MHz count rates merely due to the multiplication in the number of channels. One of the most critical aspects in the development of the segmented detectors is characterizing the charge sharing and charge loss that occur between the individual detector strips, and determining how these affect the spectral response of the detectors.

  1. Effects of dietary nitrate supplementation on symptoms of acute mountain sickness and basic physiological responses in a group of male adolescents during ascent to Mount Everest Base Camp.

    Science.gov (United States)

    Hennis, Philip J; Mitchell, Kay; Gilbert-Kawai, Edward; Bountziouka, Vassiliki; Wade, Angie; Feelisch, Martin; Grocott, Michael P; Martin, Daniel S

    2016-11-30

    The purpose of this study was to investigate the effects of dietary nitrate supplementation, in the form of beetroot juice, on acute mountain sickness (AMS) symptoms and physiological responses, in a group of young males trekking to Mount Everest Base Camp (EBC). Forty healthy male students (mean age (SD): 16 (1) yrs) trekked to EBC over 11 days. Following an overnight fast, each morning participants completed the Lake Louise AMS questionnaire and underwent a series of physiological tests: resting blood pressure as well as resting and exercising heart rate, respiratory rate, and peripheral oxygen saturation. The exercise test consisted of a standardised 2-min stepping protocol and measurements were taken in the last 10 s. Participants in the intervention arm of the study consumed 140 ml of concentrated beetroot juice daily, containing approximately 10 mmol of nitrate, while those in the control arm consumed 140 ml of concentrated blackcurrant cordial with negligible nitrate content. Drinks were taken for the first seven days at high altitude (days 2-8), in two equal doses; one with breakfast, and one with the evening meal. Mixed modelling revealed no significant between-groups difference in the incidence of AMS (Odds Ratio - nitrate vs.

  2. Decreased response to cAMP in the glucose and glycogen catabolism in perfused livers of Walker-256 tumor-bearing rats.

    Science.gov (United States)

    de Morais, Hely; Cassola, Priscila; Moreira, Carolina Campos Lima; Bôas, Suéllen Kathiane Fernandes Vilas; Borba-Murad, Glaucia Regina; Bazotte, Roberto Barbosa; de Souza, Helenir Medri

    2012-09-01

    The hepatic response to cyclic adenosine monophosphate (cAMP) and N6-monobutyryl-cAMP (N6-MB-cAMP) in the glucose and glycogen catabolism and hepatic glycogen levels were evaluated in Walker-256 tumor-bearing rats, on days 5 (WK5), 8 (WK8), and 11 (WK11) after the implantation of tumor. Rats without tumor fed ad libitum (fed control rats) or that received the same daily amount of food ingested by anorexics tumor-bearing rats (pair-fed control rats) or 24 h fasted (fasted control rats) were used as controls. Glucose and glycogen catabolism were measured in perfused liver. Hepatic glycogen levels were lower (p catabolism was lower (p catabolism, under condition of depletion of hepatic glycogen (24 h fast), was lower (p catabolism was lower (p catabolism in various stages of tumor development (days 5, 8 and 11), which was probably not due to the lower hepatic glycogen levels nor due to the increased activity of PDE3B.

  3. Response to post-donation counseling is still a challenge in outdoor voluntary blood donation camps: A survey from a tertiary care regional blood center in Eastern India

    Directory of Open Access Journals (Sweden)

    Somnath Mukherjee

    2014-01-01

    Full Text Available Background: Blood transfusion carries the risk of transmission of several infectious agents. The latest method for blood screening, nucleic acid testing is not affordable in developing countries. Aim: The study was aimed to find response to post-donation counseling for reactive markers among the voluntary blood donors donating in blood donation camps. Material and Methods: This 1 year study was conducted in 2011. Transfusion transmitted infections testing was performed by routine enzyme linked immunosorbent assay method. The initial human immunodeficiency virus (HIV reactive donors who returned back to the blood bank were confidentially counseled and referred to the Integrated Counseling Cum Testing Center (ICTC. The hepatitis B surface antigen (HBsAg and anti-hepatitis C virus (HCV reactive donors were referred to the gastroenterology department for confirmation by qualitative polymerase chain reaction (PCR, Roche Diagnostics, Germany and followed-up. Results: Twenty seven thousand two hundred forty six 27,246 units were collected during the survey. One hundred twenty nine129 units were reactive for HIV 1 and 2, 99 were reactive for HCV, 206 for hepatitis B virus (HBV. Of these reactive donors, 138 could be personally communicated. Out of 47, 27 donors who returned for counseling were initially reactive for HIV 1 and 2, 8 for HBsAg and 12 for anti-HCV. Two were positive for HBV deoxyribonucleic acid and one was positive for HCV ribonucleic acid. The HIV positivity was detected in 1 of 27 donors at ICTC. Conclusion: The response to the post-donation counseling appears in this study to be only 34% (47/138, which is still a challenge.

  4. Rehabilitating camp cities : community driven planning for urbanised refugee camps

    OpenAIRE

    Misselwitz, Philipp

    2009-01-01

    Focussing on Palestine refugee camps in the Near East, this dissertation aims to shed light on the potential relevance of urban planning to refugee camp environments worldwide. In particular, there is a focus on the role architects and urban planners can play in facilitating participatory planning processes as well as providing guidance and expertise in the development of a spatial vision for Camp Cities. Part I - The Urbanisation of Refugee Camps as a Global Challenge The first part o...

  5. The camp model for entrepreneurship teaching

    DEFF Research Database (Denmark)

    Bager, Torben

    2011-01-01

    Artiklen omhandler brugen af camps i entrepreneurship undervising - illustreret med danske camp eksempler Udgivelsesdato: online 31.03.2010......Artiklen omhandler brugen af camps i entrepreneurship undervising - illustreret med danske camp eksempler Udgivelsesdato: online 31.03.2010...

  6. The role of cAMP in synaptic homeostasis in response to environmental temperature challenges and hyperexcitability mutations

    Directory of Open Access Journals (Sweden)

    Atsushi eUeda

    2015-02-01

    Full Text Available Homeostasis is the ability of physiological systems to regain functional balance following environment or experimental insults and synaptic homeostasis has been demonstrated in various species following genetic or pharmacological disruptions. Among environmental challenges, homeostatic responses to temperature extremes are critical to animal survival under natural conditions. We previously reported that axon terminal arborization in Drosophila larval neuromuscular junctions is enhanced at elevated temperatures; however, the amplitude of excitatory junctional potentials (EJPs remains unaltered despite the increase in synaptic bouton numbers. Here we determine the cellular basis of this homeostatic adjustment in larvae reared at high temperature (HT, 29 ˚C. We found that synaptic current focally recorded from individual synaptic boutons was unaffected by rearing temperature (30 ˚C. However, HT rearing decreased the quantal size (amplitude of spontaneous miniature EJPs, or mEJPs, which compensates for the increased number of synaptic releasing sites to retain a normal EJP size. The quantal size decrease is accounted for by a decrease in input resistance of the postsynaptic muscle fiber, indicating an increase in membrane area that matches the synaptic growth at HT. Interestingly, a mutation in rutabaga (rut encoding adenylyl cyclase (AC exhibited no obvious changes in quantal size or input resistance of postsynaptic muscle cells after HT rearing, suggesting an important role for rut AC in temperature-induced synaptic homeostasis in Drosophila. This extends our previous finding of rut-dependent synaptic homeostasis in hyperexcitable mutants, e.g. slowpoke (slo. In slo larvae, the lack of BK channel function is partially ameliorated by upregulation of presynaptic Sh IA current to limit excessive transmitter release in addition to postsynaptic glutamate receptor recomposition that reduces the quantal size.

  7. Response of structural concrete elements to severe impulsive loads

    Science.gov (United States)

    Krauthammer, T.; Shanaa, H. M.; Assadi, A.

    1994-10-01

    The behavior and response of structural concrete elements under severe short duration dynamic loads was investigated numerically. The analytical approach utilized the Timoshenko beam theory for the analysis of reinforced concrete beams and one-way slabs. Nonlinear material models were used to derive the flexural and shear resistances, and the differential equations of the Timoshenko beam theory were solved numerically by applying the finite difference technique. A simplified approach was developed for estimating the strain rate in structural concrete members, and the corresponding strain rate effects on the strength of the steel and concrete were incorporated into the analysis. Detailed failure criteria were established for predicting the collapse of structural concrete members. Five cases subjected to localized impact loads and eleven cases subjected to distributed explosive loads were analyzed, and the results were compared to experimental data obtained by other investigators.

  8. Base Camp Design Simulation Training

    Science.gov (United States)

    2011-07-01

    The Army needs officers and noncommissioned officers with requisite base camp competencies. The Army’s Field Manual (FM) 3-34.400 defines a Base Camp...reason, we designed a 600-man base camp on VBS2TM from an AutoCAD diagram found on the Theater Construction Management System (version 3.2). Known

  9. Increases in cAMP, MAPK activity, and CREB phosphorylation during REM sleep: implications for REM sleep and memory consolidation.

    Science.gov (United States)

    Luo, Jie; Phan, Trongha X; Yang, Yimei; Garelick, Michael G; Storm, Daniel R

    2013-04-10

    The cyclic adenosine monophosphate (cAMP), mitogen-activated protein kinase (MAPK), and cAMP response element-binding protein (CREB) transcriptional pathway is required for consolidation of hippocampus-dependent memory. In mice, this pathway undergoes a circadian oscillation required for memory persistence that reaches a peak during the daytime. Because mice exhibit polyphasic sleep patterns during the day, this suggested the interesting possibility that cAMP, MAPK activity, and CREB phosphorylation may be elevated during sleep. Here, we report that cAMP, phospho-p44/42 MAPK, and phospho-CREB are higher in rapid eye movement (REM) sleep compared with awake mice but are not elevated in non-REM sleep. This peak of activity during REM sleep does not occur in mice lacking calmodulin-stimulated adenylyl cyclases, a mouse strain that learns but cannot consolidate hippocampus-dependent memory. We conclude that a preferential increase in cAMP, MAPK activity, and CREB phosphorylation during REM sleep may contribute to hippocampus-dependent memory consolidation.

  10. Gene Expression Patterns Define Key Transcriptional Events InCell-Cycle Regulation By cAMP And Protein Kinase A

    Energy Technology Data Exchange (ETDEWEB)

    Zambon, Alexander C.; Zhang, Lingzhi; Minovitsky, Simon; Kanter, Joan R.; Prabhakar, Shyam; Salomonis, Nathan; Vranizan, Karen; Dubchak Inna,; Conklin, Bruce R.; Insel, Paul A.

    2005-06-01

    Although a substantial number of hormones and drugs increase cellular cAMP levels, the global impact of cAMP and its major effector mechanism, protein kinase A (PKA), on gene expression is not known. Here we show that treatment of murine wild-type S49 lymphoma cells for 24 h with 8-(4-chlorophenylthio)-cAMP (8-CPTcAMP), a PKA-selective cAMP analog, alters the expression of approx equal to 4,500 of approx. equal to 13,600 unique genes. By contrast, gene expression was unaltered in Kin- S49 cells (that lack PKA) incubated with 8-CPTcAMP. Changes in mRNA and protein expression of several cell cycle regulators accompanied cAMP-induced G1-phase cell-cycle arrest of wild-type S49 cells. Within 2h, 8-CPT-cAMP altered expression of 152 genes that contain evolutionarily conserved cAMP-response elements within 5 kb of transcriptional start sites, including the circadian clock gene Per1. Thus, cAMP through its activation of PKA produces extensive transcriptional regulation in eukaryotic cells. These transcriptional networks include a primary group of cAMP-response element-containing genes and secondary networks that include the circadian clock.

  11. Cis-Lunar Base Camp

    Science.gov (United States)

    Merrill, Raymond G.; Goodliff, Kandyce E.; Mazanek, Daniel D.; Reeves, John D., Jr.

    2012-01-01

    Historically, when mounting expeditions into uncharted territories, explorers have established strategically positioned base camps to pre-position required equipment and consumables. These base camps are secure, safe positions from which expeditions can depart when conditions are favorable, at which technology and operations can be tested and validated, and facilitate timely access to more robust facilities in the event of an emergency. For human exploration missions into deep space, cis-lunar space is well suited to serve as such a base camp. The outer regions of cis-lunar space, such as the Earth-Moon Lagrange points, lie near the edge of Earth s gravity well, allowing equipment and consumables to be aggregated with easy access to deep space and to the lunar surface, as well as more distant destinations, such as near-Earth Asteroids (NEAs) and Mars and its moons. Several approaches to utilizing a cis-lunar base camp for sustainable human exploration, as well as some possible future applications are identified. The primary objective of the analysis presented in this paper is to identify options, show the macro trends, and provide information that can be used as a basis for more detailed mission development. Compared within are the high-level performance and cost of 15 preliminary cis-lunar exploration campaigns that establish the capability to conduct crewed missions of up to one year in duration, and then aggregate mass in cis-lunar space to facilitate an expedition from Cis-Lunar Base Camp. Launch vehicles, chemical propulsion stages, and electric propulsion stages are discussed and parametric sizing values are used to create architectures of in-space transportation elements that extend the existing in-space supply chain to cis-lunar space. The transportation options to cis-lunar space assessed vary in efficiency by almost 50%; from 0.16 to 0.68 kg of cargo in cis-lunar space for every kilogram of mass in Low Earth Orbit (LEO). For the 15 cases, 5-year campaign

  12. Running Boot Camp

    CERN Document Server

    Toporek, Chuck

    2008-01-01

    When Steve Jobs jumped on stage at Macworld San Francisco 2006 and announced the new Intel-based Macs, the question wasn't if, but when someone would figure out a hack to get Windows XP running on these new "Mactels." Enter Boot Camp, a new system utility that helps you partition and install Windows XP on your Intel Mac. Boot Camp does all the heavy lifting for you. You won't need to open the Terminal and hack on system files or wave a chicken bone over your iMac to get XP running. This free program makes it easy for anyone to turn their Mac into a dual-boot Windows/OS X machine. Running Bo

  13. Vibration Response of Multi Storey Building Using Finite Element Modelling

    Science.gov (United States)

    Chik, T. N. T.; Zakaria, M. F.; Remali, M. A.; Yusoff, N. A.

    2016-07-01

    Interaction between building, type of foundation and the geotechnical parameter of ground may trigger a significant effect on the building. In general, stiffer foundations resulted in higher natural frequencies of the building-soil system and higher input frequencies are often associated with other ground. Usually, vibrations transmitted to the buildings by ground borne are often noticeable and can be felt. It might affect the building and become worse if the vibration level is not controlled. UTHM building is prone to the ground borne vibration due to closed distance from the main road, and the construction activities adjacent to the buildings. This paper investigates the natural frequency and vibration mode of multi storey office building with the presence of foundation system and comparison between both systems. Finite element modelling (FEM) package software of LUSAS is used to perform the vibration analysis of the building. The building is modelled based on the original plan with the foundation system on the structure model. The FEM results indicated that the structure which modelled with rigid base have high natural frequency compare to the structure with foundation system. These maybe due to soil structure interaction and also the damping of the system which related to the amount of energy dissipated through the foundation soil. Thus, this paper suggested that modelling with soil is necessary to demonstrate the soil influence towards vibration response to the structure.

  14. A Summer Camp

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    正This summer,I had some special days.I joined Dongzhou International Educational Exchange Summer Camp. First,I will tell you about our foreign teachers,they are Shrina and Rebecca. They are friendly and beautiful.They are students at Oxford University. We talked about many things:famous people,subjects in England,different jobs, our deal days,western star signs,what can we say in a restaurant and so on.

  15. Interprofessional Flight Camp.

    Science.gov (United States)

    Alfes, Celeste M; Rowe, Amanda S

    2016-01-01

    The Dorothy Ebersbach Academic Center for Flight Nursing in Cleveland, OH, holds an annual flight camp designed for master's degree nursing students in the acute care nurse practitioner program, subspecializing in flight nursing at the Frances Payne Bolton School of Nursing at Case Western Reserve University. The weeklong interprofessional training is also open to any health care provider working in an acute care setting and focuses on critical care updates, trauma, and emergency care within the critical care transport environment. This year, 29 graduate nursing students enrolled in a master's degree program from Puerto Rico attended. Although the emergency department in Puerto Rico sees and cares for trauma patients, there is no formal trauma training program. Furthermore, the country only has 1 rotor wing air medical transport service located at the Puerto Rico Medical Center in San Juan. Flight faculty and graduate teaching assistants spent approximately 9 months planning for their participation in our 13th annual flight camp. Students from Puerto Rico were extremely pleased with the learning experiences at camp and expressed particular interest in having more training time within the helicopter flight simulator.

  16. Registration Day-Camp 2016

    CERN Multimedia

    Nursery School

    2016-01-01

    Reminder Registration for the CERN Staff Association Day-camp are open for children from 4 to 6 years old More information on the website: http://nurseryschool.web.cern.ch/. The day-camp is open to all children. An inscription per week is proposed, cost 480.-CHF/week, lunch included The camp will be open weeks 27, 28, 29 and 30, from 8:30 am to 5:30 pm. For further questions, thanks you for contacting us by email at Summer.Camp@cern.ch.

  17. Experimental investigation of motion responses of tunnel element immerging by moored barge

    Institute of Scientific and Technical Information of China (English)

    左卫广; 王永学

    2015-01-01

    In this paper, the barge effect on the motion responses of the tunnel element immerging by the moored barge under waves is investigated experimentally. Both the motion responses of the tunnel element and the moored barge in the experiment are simultaneously acquired by the Untouched 6-D Measurement System. The results show that the sway motion responses of the tunnel element immerging by the moored barge are different from those without the barge. For the system of the tunnel element and the moored barge, the moored barge has two motion components in the sway direction. The high frequency motion of the moored barge has little effect on the high frequency motion of the tunnel element with moored barge. However, the low frequency motion of the moored barge has a significant effect on the sway motion of the tunnel element. The motion responses of the tunnel element and the barge in the heave and roll directions are mainly the high frequency motion.

  18. Directed evolution of the Escherichia coli cAMP receptor protein at the cAMP pocket.

    Science.gov (United States)

    Gunasekara, Sanjiva M; Hicks, Matt N; Park, Jin; Brooks, Cory L; Serate, Jose; Saunders, Cameron V; Grover, Simranjeet K; Goto, Joy J; Lee, Jin-Won; Youn, Hwan

    2015-10-30

    The Escherichia coli cAMP receptor protein (CRP) requires cAMP binding to undergo a conformational change for DNA binding and transcriptional regulation. Two CRP residues, Thr(127) and Ser(128), are known to play important roles in cAMP binding through hydrogen bonding and in the cAMP-induced conformational change, but the connection between the two is not completely clear. Here, we simultaneously randomized the codons for these two residues and selected CRP mutants displaying high CRP activity in a cAMP-producing E. coli. Many different CRP mutants satisfied the screening condition for high CRP activity, including those that cannot form any hydrogen bonds with the incoming cAMP at the two positions. In vitro DNA-binding analysis confirmed that these selected CRP mutants indeed display high CRP activity in response to cAMP. These results indicate that the hydrogen bonding ability of the Thr(127) and Ser(128) residues is not critical for the cAMP-induced CRP activation. However, the hydrogen bonding ability of Thr(127) and Ser(128) was found to be important in attaining high cAMP affinity. Computational analysis revealed that most natural cAMP-sensing CRP homologs have Thr/Ser, Thr/Thr, or Thr/Asn at positions 127 and 128. All of these pairs are excellent hydrogen bonding partners and they do not elevate CRP activity in the absence of cAMP. Taken together, our analyses suggest that CRP evolved to have hydrogen bonding residues at the cAMP pocket residues 127 and 128 for performing dual functions: preserving high cAMP affinity and keeping CRP inactive in the absence of cAMP.

  19. Summer Camp as Therapeutic Context: The Camp Logan Program.

    Science.gov (United States)

    McCammon, Susan; And Others

    These symposium papers describe various aspects of the Camp Logan, South Carolina, program, a therapeutic summer residential program for children, ages 8-14, who have significant behavior problems. The philosophy and advantages of the therapeutic camping model are discussed, e.g., structure during the summer, controlled though informal…

  20. Summer Camp, July 2016

    CERN Multimedia

    Staff Association

    2016-01-01

    During the month of July, the Staff Association’s Children’s Day-Care Centre and School EVEE held a summer camp for 4- to 6-year-olds. 24 children altogether joined in on the adventures. On the summer camp, the children got to “travel” to a different continent of the world every week. Day after day, they would pass through make-believe Customs upon arrival and get their passports stamped by a “customs officer”. For the first week, we went on a trip to Africa. In the spirit of the theme, the children got to do plenty of crafts and coloring, make their own little bindles and play various games. They even had the chance to visit the Museum of Ethnography in Geneva (MEG), learn to play the balafon and make musical instruments with Sterrenlab. For the second week, we set off to discover the Americas, exploring both the South and the North. Alongside different workshops (singing, dancing, storytelling, crafts), the children could enjoy several special ac...

  1. Systems biology investigation of cAMP modulation to increase SMN levels for the treatment of spinal muscular atrophy.

    Directory of Open Access Journals (Sweden)

    Sean G Mack

    Full Text Available Spinal muscular atrophy (SMA, a leading genetic cause of infant death worldwide, is an autosomal recessive disorder caused by the loss of SMN1 (survival motor neuron 1, which encodes the protein SMN. The loss of SMN1 causes a deficiency in SMN protein levels leading to motor neuron cell death in the anterior horn of the spinal cord. SMN2, however, can also produce some functional SMN to partially compensate for loss of SMN1 in SMA suggesting increasing transcription of SMN2 as a potential therapy to treat patients with SMA. A cAMP response element was identified on the SMN2 promoter, implicating cAMP activation as a step in the transcription of SMN2. Therefore, we investigated the effects of modulating the cAMP signaling cascade on SMN production in vitro and in silico. SMA patient fibroblasts were treated with the cAMP signaling modulators rolipram, salbutamol, dbcAMP, epinephrine and forskolin. All of the modulators tested were able to increase gem formation, a marker for SMN protein in the nucleus, in a dose-dependent manner. We then derived two possible mathematical models simulating the regulation of SMN2 expression by cAMP signaling. Both models fit well with our experimental data. In silico treatment of SMA fibroblasts simultaneously with two different cAMP modulators resulted in an additive increase in gem formation. This study shows how a systems biology approach can be used to develop potential therapeutic targets for treating SMA.

  2. Kids Camping Takes the Challenge.

    Science.gov (United States)

    James, Vickie L.; Hohnbaum, Claudia

    2002-01-01

    A Wisconsin Girl Scout camp integrated The Healthy Kids Challenge into its program. The camp evaluated policies related to meals, snacks, physical activities, team building, and self-esteem. Staff inservice training resulted in healthier meals on the same budget and developed ownership of the program. Campers and families had opportunities to…

  3. Encountering Child Abuse at Camp.

    Science.gov (United States)

    Durall, John K.

    1997-01-01

    Defines child abuse, including the three categories: physical, sexual, and psychological. Presents characteristics and behaviors of each type of abuse, and long-term effects. Discusses how to handle abuse that occurs at camp, and the effects on the camp. Sidebars present abuse statistics, 15 activities that promote psychological wellness, and 8…

  4. Lichens (Parmelia sulcata) time response model to environmental elemental availability

    NARCIS (Netherlands)

    Reis, M.A.; Alves, L.C.; Freitas, M.C.; Os, B. van; Wolterbeek, H.T.

    1999-01-01

    Parmelia sulcata transplants, collected in a non-polluted area, were exposed to new atmospheric conditions at six stations, of which five were located near power plants and one at an unpolluted area. Data were collected for a 1-year period, on rainfall, airborne particulates, elemental deposition an

  5. Finite element model calibration using frequency responses with damping equalization

    Science.gov (United States)

    Abrahamsson, T. J. S.; Kammer, D. C.

    2015-10-01

    Model calibration is a cornerstone of the finite element verification and validation procedure, in which the credibility of the model is substantiated by positive comparison with test data. The calibration problem, in which the minimum deviation between finite element model data and experimental data is searched for, is normally characterized as being a large scale optimization problem with many model parameters to solve for and with deviation metrics that are nonlinear in these parameters. The calibrated parameters need to be found by iterative procedures, starting from initial estimates. Sometimes these procedures get trapped in local deviation function minima and do not converge to the globally optimal calibration solution that is searched for. The reason for such traps is often the multi-modality of the problem which causes eigenmode crossover problems in the iterative variation of parameter settings. This work presents a calibration formulation which gives a smooth deviation metric with a large radius of convergence to the global minimum. A damping equalization method is suggested to avoid the mode correlation and mode pairing problems that need to be solved in many other model updating procedures. By this method, the modal damping of a test data model and the finite element model is set to be the same fraction of critical modal damping. Mode pairing for mapping of experimentally found damping to the finite element model is thus not needed. The method is combined with model reduction for efficiency and employs the Levenberg-Marquardt minimizer with randomized starts to achieve the calibration solution. The performance of the calibration procedure, including a study of parameter bias and variance under noisy data conditions, is demonstrated by two numerical examples.

  6. Modeling Reader's Emotional State Response on Document's Typographic Elements

    Directory of Open Access Journals (Sweden)

    Dimitrios Tsonos

    2011-01-01

    Full Text Available We present the results of an experimental study towards modeling the reader's emotional state variations induced by the typographic elements in electronic documents. Based on the dimensional theory of emotions we investigate how typographic elements, like font style (bold, italics, bold-italics and font (type, size, color and background color, affect the reader's emotional states, namely, Pleasure, Arousal, and Dominance (PAD. An experimental procedure was implemented conforming to International Affective Picture System guidelines and incorporating the Self-Assessment Manikin test. Thirty students participated in the experiment. The stimulus was a short paragraph of text for which any content, emotion, and/or domain dependent information was excluded. The Analysis of Variance revealed the dependency of (a all the three emotional dimensions on font size and font/background color combinations and (b the Pleasure dimension on font type and font style. We introduce a set of mapping rules showing how PAD vary on the discrete values of font style and font type elements. Moreover, we introduce a set of equations describing the PAD dimensions' dependency on font size. This novel model can contribute to the automated reader's emotional state extraction in order, for example, to enhance the acoustic rendition of the documents, utilizing text-to-speech synthesis.

  7. Finite-element impact response of debonded composite turbine blades

    Science.gov (United States)

    Dey, Sudip; Karmakar, Amit

    2014-02-01

    This paper investigates on the transient behavior of debonded composite pretwisted rotating shallow conical shells which could be idealized as turbine blades subjected to low velocity normal impact using finite-element method. Lagrange's equation of motion is used to derive the dynamic equilibrium equation and the moderate rotational speeds are considered neglecting the Coriolis effect. An eight-noded isoparametric plate bending element is employed in the finite element formulation incorporating rotary inertia and effects of transverse shear deformation based on Mindlin's theory. The modified Hertzian contact law which accounts for permanent indentation is utilized to compute the impact parameters. The time-dependent equations are solved by using Newmark's time integration scheme. Parametric studies are performed to investigate the effects of triggering parameters like angle of twist, rotational speed, laminate configuration and location of debonding considering low velocity normal impact at the center of eight-layered graphite-epoxy composite cantilevered conical shells with bending stiff ([0o2/{±} 30o]s), torsion stiff ([45°/-45°/-45°/45°]s) and cross-ply ([0°/90°/0°/90°]s) laminate configurations.

  8. Cis-element of the rice PDIL2-3 promoter is responsible for inducing the endoplasmic reticulum stress response.

    Science.gov (United States)

    Takahashi, Hideyuki; Wang, Shuyi; Hayashi, Shimpei; Wakasa, Yuhya; Takaiwa, Fumio

    2014-05-01

    A protein disulfide isomerase (PDI) family oxidoreductase, PDIL2-3, is involved in endoplasmic reticulum (ER) stress responses in rice. We identified a critical cis-element required for induction of the ER stress response. The activation of PDIL2-3 in response to ER stress strongly depends on the IRE1-OsbZIP50 signaling pathway.

  9. A Computational Modeling and Simulation Approach to Investigate Mechanisms of Subcellular cAMP Compartmentation.

    Science.gov (United States)

    Yang, Pei-Chi; Boras, Britton W; Jeng, Mao-Tsuen; Docken, Steffen S; Lewis, Timothy J; McCulloch, Andrew D; Harvey, Robert D; Clancy, Colleen E

    2016-07-01

    Subcellular compartmentation of the ubiquitous second messenger cAMP has been widely proposed as a mechanism to explain unique receptor-dependent functional responses. How exactly compartmentation is achieved, however, has remained a mystery for more than 40 years. In this study, we developed computational and mathematical models to represent a subcellular sarcomeric space in a cardiac myocyte with varying detail. We then used these models to predict the contributions of various mechanisms that establish subcellular cAMP microdomains. We used the models to test the hypothesis that phosphodiesterases act as functional barriers to diffusion, creating discrete cAMP signaling domains. We also used the models to predict the effect of a range of experimentally measured diffusion rates on cAMP compartmentation. Finally, we modeled the anatomical structures in a cardiac myocyte diad, to predict the effects of anatomical diffusion barriers on cAMP compartmentation. When we incorporated experimentally informed model parameters to reconstruct an in silico subcellular sarcomeric space with spatially distinct cAMP production sites linked to caveloar domains, the models predict that under realistic conditions phosphodiesterases alone were insufficient to generate significant cAMP gradients. This prediction persisted even when combined with slow cAMP diffusion. When we additionally considered the effects of anatomic barriers to diffusion that are expected in the cardiac myocyte dyadic space, cAMP compartmentation did occur, but only when diffusion was slow. Our model simulations suggest that additional mechanisms likely contribute to cAMP gradients occurring in submicroscopic domains. The difference between the physiological and pathological effects resulting from the production of cAMP may be a function of appropriate compartmentation of cAMP signaling. Therefore, understanding the contribution of factors that are responsible for coordinating the spatial and temporal

  10. Inhibin alpha gene expression in human trophoblasts is regulated by interactions between TFAP2 and cAMP signaling pathways.

    Science.gov (United States)

    Depoix, Christophe L; Debiève, Frédéric; Hubinont, Corinne

    2014-11-01

    Inhibin α (Inha) gene expression is regulated, in rat granulosa cells, via a cyclic 3',5'-adenosine monophosphate (AMP)-response element (CRE) found in a region of the promoter that is homologous to the human INHA promoter. We previously found that during in vitro cytotrophoblast differentiation, human INHA gene expression was regulated by TFAP2A via association with an AP-2 site located upstream of this CRE. The aim of this study was to evaluate if the human INHA gene was also regulated by cAMP in trophoblasts, and to investigate the possible crosstalk between TFAP2 and cAMP signaling pathways in the regulation of INHA gene expression. Treatment with cAMP or forskolin increased INHA mRNA expression by 7- and 2-fold in primary cytotrophoblasts and choriocarcinoma-derived BeWo cells, respectively. Treatment with the protein kinase A inhibitor H-89 reduced forskolin-induced luciferase activity by ∼40% in BeWo cells transfected with an INHA promoter-driven luciferase reporter vector. TFAP2 overexpression increased basal luciferase activity, whereas the dominant repressor KCREB abolished it. Surprisingly, mutation of the CRE also eliminated the TFAP2-induced transcription, although TFAP2 overexpression was still able to increase forskolin-induced luciferase activity when the AP-2 binding site, but not the CRE site, was mutated. Thus, INHA gene expression is upregulated by cAMP via CRE in human trophoblasts, and TFAP2 regulates this expression by interacting with CRE.

  11. Functional cyclic AMP response element in the breast cancer resistance protein (BCRP/ABCG2) promoter modulates epidermal growth factor receptor pathway- or androgen withdrawal-mediated BCRP/ABCG2 transcription in human cancer cells.

    Science.gov (United States)

    Xie, Yi; Nakanishi, Takeo; Natarajan, Karthika; Safren, Lowell; Hamburger, Anne W; Hussain, Arif; Ross, Douglas D

    2015-03-01

    Phosphorylated cyclic-AMP (cAMP) response element binding protein (p-CREB) is a downstream effector of a variety of important signaling pathways. We investigated whether the human BCRP promoter contains a functional cAMP response element (CRE). 8Br-cAMP, a cAMP analogue, increased the activity of a BCRP promoter reporter construct and BCRP mRNA in human carcinoma cells. Epidermal growth factor receptor (EGFR) pathway activation also led to an increase in p-CREB and in BCRP promoter reporter activity via two major downstream EGFR signaling pathways: the phosphotidylinositol-3-kinase (PI3K)/AKT pathway and the mitogen-activated protein kinase (MAPK) pathway. EGF treatment increased the phosphorylation of EGFR, AKT, ERK and CREB, while simultaneously enhancing BCRP mRNA and functional protein expression. EGF-stimulated CREB phosphorylation and BCRP induction were diminished by inhibition of EGFR, PI3K/AKT or RAS/MAPK signaling. CREB silencing using RNA interference reduced basal levels of BCRP mRNA and diminished the induction of BCRP by EGF. Chromatin immunoprecipitation assays confirmed that a putative CRE site on the BCRP promoter bound p-CREB by a point mutation of the CRE site abolished EGF-induced stimulation of BCRP promoter reporter activity. Furthermore, the CREB co-activator, cAMP-regulated transcriptional co-activator (CRTC2), is involved in CREB-mediated BCRP transcription: androgen depletion of LNCaP human prostate cancer cells increased both CREB phosphorylation and CRTC2 nuclear translocation, and enhanced BCRP expression. Silencing CREB or CRTC2 reduced basal BCRP expression and BCRP induction under androgen-depletion conditions. This novel CRE site plays a central role in mediating BCRP gene expression in several human cancer cell lines following activation of multiple cancer-relevant signaling pathways.

  12. Novel mechanisms and signaling pathways of esophageal ulcer healing: the role of prostaglandin EP2 receptors, cAMP, and pCREB.

    Science.gov (United States)

    Ahluwalia, Amrita; Baatar, Dolgor; Jones, Michael K; Tarnawski, Andrzej S

    2014-09-15

    Clinical studies indicate that prostaglandins of E class (PGEs) may promote healing of tissue injury e.g., gastroduodenal and dermal ulcers. However, the precise roles of PGEs, their E-prostanoid (EP) receptors, signaling pathways including cAMP and cAMP response element-binding protein (CREB), and their relation to VEGF and angiogenesis in the tissue injury healing process remain unknown, forming the rationale for this study. Using an esophageal ulcer model in rats, we demonstrated that esophageal mucosa expresses predominantly EP2 receptors and that esophageal ulceration triggers an increase in expression of the EP2 receptor, activation of CREB (the downstream target of the cAMP signaling), and enhanced VEGF gene expression. Treatment of rats with misoprostol, a PGE1 analog capable of activating EP receptors, enhanced phosphorylation of CREB, stimulated VEGF expression and angiogenesis, and accelerated esophageal ulcer healing. In cultured human esophageal epithelial (HET-1A) cells, misoprostol increased intracellular cAMP levels (by 163-fold), induced phosphorylation of CREB, and stimulated VEGF expression. A cAMP analog (Sp-cAMP) mimicked, whereas an inhibitor of cAMP-dependent protein kinase A (Rp-cAMP) blocked, these effects of misoprostol. These results indicate that the EP2/cAMP/protein kinase A pathway mediates the stimulatory effect of PGEs on angiogenesis essential for tissue injury healing via the induction of CREB activity and VEGF expression.

  13. Day Camp Manual: Administration. Book I.

    Science.gov (United States)

    Babcock, William

    The first book in a 5-book manual on day camping focuses on summer day camp administration. The book defines day camps as organized group experiences in outdoor living on a day-by-day basis and under trained leadership. It includes a philosophy of day camping, noting benefits to the campers. The book is divided into further chapters that describe…

  14. Slave Labor Camps of the Third Reich.

    Science.gov (United States)

    Stone, Adolf

    1983-01-01

    Describes the ground rules used by Nazi architects in choosing the sites for slave labor camps. While some, like Auschwitz, became extermination camps, others also produced armaments. One camp, Theresienstadt, became a "model" camp to show to reporters and Red Cross representatives. (CS)

  15. Ecological responsibility of business as public-private partnership element

    Directory of Open Access Journals (Sweden)

    I.M. Potravniy

    2011-10-01

    Full Text Available In the article the questions of social and ecological responsibility of business are considered within the public-private partnership mechanism framework. Methods of the ecological significant project economic regulation are shown in wildlife management and environment protection sphere.

  16. Moral Responsibility: The Missing Element in Educational Leadership

    Science.gov (United States)

    Vasillopulos, Christopher; Denney, Morgan

    2013-01-01

    We intend to deepen the understanding of leadership in general and educational leadership in particular by an analysis of Chester Barnard's (1938) concept of executive responsibility. By so doing we believe that we will reveal how an educational leader can foster the environment in which competent teachers can optimize their students' learning…

  17. Registration Day-Camp 2016

    CERN Multimedia

    Nursery School

    2016-01-01

    Registration for the CERN SA Day-camp are open for children from 4 to 6 years old From March 14 to 25 for children already enrolled in CERN SA EVE and School From April 4 to 15 for the children of CERN members of the personnel (MP) From April 18 for other children More information on the website: http://nurseryschool.web.cern.ch/. The day-camp is open to all children. An inscription per week is proposed, cost 480.-CHF/week, lunch included The camp will be open weeks 27, 28, 29 and 30, from 8:30 am to 5:30 pm. For further questions, thanks you for contacting us by email at Summer.Camp@cern.ch.

  18. Three-dimensional measurement of cAMP gradients using hyperspectral confocal microscopy

    Science.gov (United States)

    Rich, Thomas C.; Annamdevula, Naga; Britain, Andrea L.; Mayes, Samuel; Favreau, Peter F.; Leavesley, Silas J.

    2016-03-01

    Cyclic AMP (cAMP) is a ubiquitous second messenger known to differentially regulate many cellular functions over a wide range of timescales. Several lines of evidence have suggested that the distribution of cAMP within cells is not uniform, and that cAMP compartmentalization is largely responsible for signaling specificity within the cAMP signaling pathway. However, to date, no studies have experimentally measured three dimensional (3D) cAMP distributions within cells. Here we use both 2D and 3D hyperspectral microscopy to visualize cAMP gradients in endothelial cells from the pulmonary microvasculature (PMVECs). cAMP levels were measured using a FRETbased cAMP sensor comprised of a cAMP binding domain from EPAC sandwiched between FRET donors and acceptors -- Turquoise and Venus fluorescent proteins. Data were acquired using either a Nikon A1R spectral confocal microscope or custom spectral microscopy system. Analysis of hyperspectral image stacks from a single confocal slice or from summed images of all slices (2D analysis) indicated little or no cAMP gradients were formed within PMVECs under basal conditions or following agonist treatment. However, analysis of hyperspectral image stacks from 3D cellular geometries (z stacks) demonstrate marked cAMP gradients from the apical to basolateral membrane of PMVECs. These results strongly suggest that 2D imaging studies of cAMP compartmentalization -- whether epifluorescence or confocal microscopy -- may lead to erroneous conclusions about the existence of cAMP gradients, and that 3D studies are required to assess mechanisms of signaling specificity.

  19. Prediction of transcriptional regulatory elements for plant hormone responses based on microarray data

    Directory of Open Access Journals (Sweden)

    Yamaguchi-Shinozaki Kazuko

    2011-02-01

    Full Text Available Abstract Background Phytohormones organize plant development and environmental adaptation through cell-to-cell signal transduction, and their action involves transcriptional activation. Recent international efforts to establish and maintain public databases of Arabidopsis microarray data have enabled the utilization of this data in the analysis of various phytohormone responses, providing genome-wide identification of promoters targeted by phytohormones. Results We utilized such microarray data for prediction of cis-regulatory elements with an octamer-based approach. Our test prediction of a drought-responsive RD29A promoter with the aid of microarray data for response to drought, ABA and overexpression of DREB1A, a key regulator of cold and drought response, provided reasonable results that fit with the experimentally identified regulatory elements. With this succession, we expanded the prediction to various phytohormone responses, including those for abscisic acid, auxin, cytokinin, ethylene, brassinosteroid, jasmonic acid, and salicylic acid, as well as for hydrogen peroxide, drought and DREB1A overexpression. Totally 622 promoters that are activated by phytohormones were subjected to the prediction. In addition, we have assigned putative functions to 53 octamers of the Regulatory Element Group (REG that have been extracted as position-dependent cis-regulatory elements with the aid of their feature of preferential appearance in the promoter region. Conclusions Our prediction of Arabidopsis cis-regulatory elements for phytohormone responses provides guidance for experimental analysis of promoters to reveal the basis of the transcriptional network of phytohormone responses.

  20. Effect of Large Negative Phase of Blast Loading on Structural Response of RC Elements

    Directory of Open Access Journals (Sweden)

    Syed Zubair Iman

    2016-01-01

    Full Text Available Structural response of reinforced concrete (RC elements for analysis and design are often obtained using the positive phase of the blast pressure curve disregarding the negative phase assuming insignificant contribution from the negative phase of the loading. Although, some insight on the effect of negative phase of blast pressure based on elastic single-degree-of-freedom (SDOF analysis was presented before, the influence of negative phase on different types of resistance functions of SDOF models and on realistic finite element analysis has not been explored. In this study, the effects of inclusion of pulse negative phase on structural response of RC elements from SDOF analysis and from more detailed finite element analysis have been investigated. Investigation of SDOF part has been conducted using MATLAB code that utilizes non-linear resistance functions of SDOF model. Detailed numerical investigation using finite element code DIANA was conducted on the significance of the negative phase on structural response. In the FE model, different support stiffness was used to explore the effect of support stiffness on the structural response due to blast negative phase. Results from SDOF and FE analyses present specific situations where the effect of large negative phase was found to be significant on the structural response of RC elements.

  1. Cyclic AMP enhances TGFβ responses of breast cancer cells by upregulating TGFβ receptor I expression.

    Directory of Open Access Journals (Sweden)

    Ilka Oerlecke

    Full Text Available Cellular functions are regulated by complex networks of many different signaling pathways. The TGFβ and cAMP pathways are of particular importance in tumor progression. We analyzed the cross-talk between these pathways in breast cancer cells in 2D and 3D cultures. We found that cAMP potentiated TGFβ-dependent gene expression by enhancing Smad3 phosphorylation. Higher levels of total Smad3, as observed in 3D-cultured cells, blocked this effect. Two Smad3 regulating proteins, YAP (Yes-associated protein and TβRI (TGFβ receptor 1, were responsive to cAMP. While YAP had little effect on TGFβ-dependent expression and Smad3 phosphorylation, a constitutively active form of TβRI mimicked the cAMP effect on TGFβ signaling. In 3D-cultured cells, which show much higher levels of TβRI and cAMP, TβRI was unresponsive to cAMP. Upregulation of TβRI expression by cAMP was dependent on transcription. A proximal TβRI promoter fragment was moderately, but significantly activated by cAMP suggesting that cAMP increases TβRI expression at least partially by activating TβRI transcription. Neither the cAMP-responsive element binding protein (CREB nor the TβRI-regulating transcription factor Six1 was required for the cAMP effect. An inhibitor of histone deacetylases alone or together with cAMP increased TβRI expression by a similar extent as cAMP alone suggesting that cAMP may exert its effect by interfering with histone acetylation. Along with an additive stimulatory effect of cAMP and TGFβ on p21 expression an additive inhibitory effect of these agents on proliferation was observed. Finally, we show that mesenchymal stem cells that interact with breast cancer cells can simultaneously activate the cAMP and TGFβ pathways. In summary, these data suggest that combined effects of cAMP and TGFβ, as e.g. induced by mesenchymal stem cells, involve the upregulation of TβRI expression on the transcriptional level, likely due to changes in histone acetylation

  2. Hydromania: Summer Science Camp Curriculum.

    Energy Technology Data Exchange (ETDEWEB)

    Moura, Joan

    1995-07-01

    In 1992, Bonneville Power Administration (BPA) and the US Department of Energy (DOE) began a collaborative pilot project with the Portland Parks and Recreation Community Schools Program and others to provide summer science camps to children in Grades 4--6. Camps run two weeks in duration between late June and mid-August. Sessions are five days per week, from 9 a.m. to 3 p.m. In addition to hands-on science and math curriculum, at least three field trips are incorporated into the educational learning experience. The purpose of the BPA/DOE summer camps is to make available opportunities for fun, motivating experiences in science to students who otherwise would have difficulty accessing them. This includes inner city, minority, rural and low income students. Public law 101-510, which Congress passed in 1990, authorizes DOE facilities to establish collaborative inner-city and rural partnership programs in science and math. A primary goal of the BPA summer hands on science camps is to bring affordable science camp experiences to students where they live. It uses everyday materials to engage students` minds and to give them a sense that they have succeeded through a fun hands-on learning environment.

  3. The Popeye Domain Containing Genes and cAMP Signaling

    Directory of Open Access Journals (Sweden)

    Thomas Brand

    2014-05-01

    Full Text Available 3'-5'-cyclic adenosine monophosphate (cAMP is a second messenger, which plays an important role in the heart. It is generated in response to activation of G-protein-coupled receptors (GPCRs. Initially, it was thought that protein kinase A (PKA exclusively mediates cAMP-induced cellular responses such as an increase in cardiac contractility, relaxation, and heart rate. With the identification of the exchange factor directly activated by cAMP (EPAC and hyperpolarizing cyclic nucleotide-gated (HCN channels as cAMP effector proteins it became clear that a protein network is involved in cAMP signaling. The Popeye domain containing (Popdc genes encode yet another family of cAMP-binding proteins, which are prominently expressed in the heart. Loss-of-function mutations in mice are associated with cardiac arrhythmia and impaired skeletal muscle regeneration. Interestingly, the cardiac phenotype, which is present in both, Popdc1 and Popdc2 null mutants, is characterized by a stress-induced sinus bradycardia, suggesting that Popdc proteins participate in cAMP signaling in the sinuatrial node. The identification of the two-pore channel TREK-1 and Caveolin 3 as Popdc-interacting proteins represents a first step into understanding the mechanisms of heart rate modulation triggered by Popdc proteins.

  4. State-of-the-art Review : Vol. 2A. Responsive Building Elements

    DEFF Research Database (Denmark)

    Blümel, Ernst; Haghighat, Fariborz; Li, Yuguo

    . The publication is an internal Annex report. With a focus on innovative building elements that dynamically respond to changes in climate and user demands, the report describes materials, components and systems that have been tested in laboratories and buildings around the world. This report is aimed......This report resumes and presents the activity done in Subtask A of IEA-ECBCS Annex 44 “Integrating Environmentally Responsive Elements in Buildings” concerning the state of the art review of Responsive Building Elements. It is based on the contributions from the participating countries...... at researchers in the field and gives an overview of how these elements work together with available performance data. It is hoped, that this report will be helpful for researchers in their search for new solutions to the problem of designing and constructing sustainable buildings....

  5. Insulin regulation of the glucagon gene is mediated by an insulin-responsive DNA element.

    OpenAIRE

    1991-01-01

    Diabetes mellitus is characterized by insulin deficiency and high plasma glucagon levels, which can be normalized by insulin replacement. It has previously been reported that glucagon gene expression is negatively regulated by insulin at the transcriptional level. By transfection studies, I have now localized a DNA control element that mediates insulin effects on glucagon gene transcription. This element also confers insulin responsiveness to a heterologous promoter. DNA-binding proteins that...

  6. Starting a Technology Camp for Children.

    Science.gov (United States)

    Litowitz, Len S.; Baylor, Steven C.

    1997-01-01

    Presents information for starting and maintaining a technology camp for students. Includes selecting topics, identifying participants, marketing, managing the camp, budgeting, and benefits to students and host institutions. (JOW)

  7. Eurasia Project—2007 Italian Camp Held

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    <正>From July 14 to 29,the Eurasia Project—2007 Italian Camp was held at the Castle Fusano Country Club in Rome. 52 high school students from Germany,Poland,Italy and China participated in the summer camp.

  8. Response of removable epoxy foam exposed to fire using an element death model.

    Energy Technology Data Exchange (ETDEWEB)

    Hobbs, Michael L.

    2004-09-01

    Response of removable epoxy foam (REF) to high heat fluxes is described using a decomposition chemistry model [1] in conjunction with a finite element heat conduction code [2] that supports chemical kinetics and dynamic radiation enclosures. The chemistry model [1] describes the temporal transformation of virgin foam into carbonaceous residue by considering breakdown of the foam polymer structure, desorption of gases not associated with the foam polymer, mass transport of decomposition products from the reaction site to the bulk gas, and phase equilibrium. The finite element foam response model considers the spatial behavior of the foam by using measured and predicted thermophysical properties in combination with the decomposition chemistry model. Foam elements are removed from the computational domain when the condensed mass fractions of the foam elements are close to zero. Element removal, referred to as element death, creates a space within the metal confinement causing radiation to be the dominant mode of heat transfer between the surface of the remaining foam elements and the interior walls of the confining metal skin. Predictions were compared to front locations extrapolated from radiographs of foam cylinders enclosed in metal containers that were heated with quartz lamps [3,4]. The effects of the maximum temperature of the metal container, density of the foam, the foam orientation, venting of the decomposition products, pressurization of the metal container, and the presence or absence of embedded components are discussed.

  9. Finite element analysis of dynamic response and structure borne noise of gearbox

    Institute of Scientific and Technical Information of China (English)

    LIU Wen; LIN Teng-jiao; LI Run-fang; DU Xue-song

    2007-01-01

    A dynamic finite element method combined with finite element mixed formula for contact problem is used to analyze the dynamic characteristics of gear system. Considering the stiffness excitation, error excitation and meshing shock excitation, the dynamic finite element model is established for the entire gear system which includes gears, shafts, bearings and gearbox housing. By the software of I-DEAS, the natural frequency, normal mode, dynamic time-domain response, frequency-domain response and one-third octave velocity grade structure borne noise of gear system are studied by the method of theoretical modal analysis and dynamic response analysis. The maximum values of vibration and structure borne noise are occurred at the mesh frequency of output grade gearing.

  10. Marketing Camp to Parents and Children.

    Science.gov (United States)

    Cony, Steven R.

    1995-01-01

    An effective camp marketing strategy should address both parents' and children's concerns that influence decisions about camp. Includes strategies for developing a targeted message through print media or video that addresses these concerns and persuades families to choose camp. Stresses the importance of following up with parents and children. (LP)

  11. Extension Sustainability Camp: Design, Implementation, and Evaluation

    Science.gov (United States)

    Brain, Roslynn; Upton, Sally; Tingey, Brett

    2015-01-01

    Sustainability Camps provide an opportunity for Extension educators to be in the forefront of sustainability outreach and to meet the growing demand for sustainability education. This article shares development, implementation, and evaluation of an Extension Sustainability Camp for youth, grades 4-6. Camp impact was measured via daily pre-and…

  12. Summer Science Camps Program (SSC).

    Science.gov (United States)

    National Science Foundation, Washington, DC. Directorate for Education and Human Resources.

    The Summer Science Camps (SSC) Program supports residential and commuter enrichment projects for seventh through ninth grade minority students who are underrepresented in science, engineering, and mathematics. Eligible organizations include school districts, museums, colleges, universities, and nonprofit youth-centered and/or community-based…

  13. The Emotional Benefits of Camping.

    Science.gov (United States)

    Johnson, Rebecca Cowan

    1991-01-01

    Regardless of participant background, age, or ethnic origin, camp can aid in the following key components of emotional maturity: open, positive and appropriate expression of feelings; self-acceptance; a sense of self; an awareness and acceptance of others and their feelings; the ability to develop relationships; and emotional stability. (LP)

  14. The NAO goes to camp

    NARCIS (Netherlands)

    Wigdor, N.; Fraaije, A.; Solms, L.; Greeff, J. de; Janssen, J.; Blanson Henkemans, O.A.

    2014-01-01

    ALIZ-E is a Europe-wide project focusing on long-term child-robot interaction, specifically as a means of educating diabetic children on their condition. This video showcases a recent field study at "SugarKidsClub", a camp devoted to helping 7-12 year-olds handle type-1 diabetes. A wide range of CRI

  15. Elevated cAMP increases aquaporin-3 plasma membrane diffusion

    DEFF Research Database (Denmark)

    Marlar, Saw; Christensen, Eva Arnspang; Koffman, Jennifer Skaarup

    2014-01-01

    .05)]. Immunoelectron microscopy showed no obvious difference in AQP3-EGFP expression levels or localization in the plasma membrane upon forskolin stimulation. Thus AQP3-EGFP diffusion is altered upon increased cAMP, which may correspond to basolateral adaptations in response to the increased apical water readsorption...

  16. Academic Boot Camp for the Writing of Psychology Research Reports

    Science.gov (United States)

    Skues, Jason L.; Wise, Lisa

    2014-01-01

    Herein, we describe the implementation of, and responses to, a structured writing workshop in the form of an academic boot camp. Participants were 42 undergraduate psychology students from a medium-sized Australian university who were completing their major assignment for the semester. A majority of the students expressed satisfaction with the…

  17. Responses of trace elements to aerobic maximal exercise in elite sportsmen.

    Science.gov (United States)

    Otag, Aynur; Hazar, Muhsin; Otag, Ilhan; Gürkan, Alper Cenk; Okan, Ilyas

    2014-02-21

    Trace elements are chemical elements needed in minute quantities for the proper growth, development, and physiology of the organism. In biochemistry, a trace element is also referred to as a micronutrient. Trace elements, such as nickel, cadmium, aluminum, silver, chromium, molybdenum, germanium, tin, titanium, tungsten, scandium, are found naturally in the environment and human exposure derives from a variety of sources, including air, drinking water and food. The Purpose of this study was investigated the effect of aerobic maximal intensity endurance exercise on serum trace elements as well-trained individuals of 28 wrestlers (age (year) 19.64±1.13, weight (Kg) 70.07 ± 15.69, height (cm) 176.97 ± 6.69) during and after a 2000 meter Ergometer test protocol was used to perform aerobic (75 %) maximal endurance exercise. Trace element serum levels were analyzed from blood samples taken before, immediately after and one hour after the exercise. While an increase was detected in Chromium (Cr), Nickel (Ni), Molybdenum (Mo) and Titanium (Ti) serum levels immediately after the exercise, a decrease was detected in Aluminum (Al), Scandium (Sc) and Tungsten (W) serum levels. Except for aluminum, the trace elements we worked on showed statistically meaningful responses (P sportsman performance but also in terms of future healthy life plans and clinically.

  18. Simulation of Electromagnetic Wave Logging Response in Deviated Wells Based on Vector Finite Element Method

    Institute of Scientific and Technical Information of China (English)

    LV Wei-Guo; CHU Zhao-Tan; ZHAO Xiao-Qing; FAN Yu-Xiu; SONG Ruo-Long; HAN Wei

    2009-01-01

    The vector finite element method of tetrahedral elements is used to model 3D electromagnetic wave logging response. The tangential component of the vector field at the mesh edges is used as a degree of freedom to overcome the shortcomings of node-based finite element methods. The algorithm can simulate inhomogeneous media with arbitrary distribution of conductivity and magnetic permeability. The electromagnetic response of well logging tools are studied in dipping bed layers with the borehole and invasion included. In order to simulate realistic logging tools, we take the transmitter antennas consisting of circular wire loops instead of magnetic dipoles. We also investigate the apparent resistivity of inhomogeneous formation for different dip angles.

  19. Are collapsars responsible for some r-process elements? How could we tell?

    Energy Technology Data Exchange (ETDEWEB)

    Pruet, J

    2004-04-05

    We consider the possibility that supernovae which form hyper-accreting black holes might be responsible for synthesis of r-process elements with mass A {approx}< 130. Calculations are presented which show that these elements are naturally synthesized in neutron-rich magnetically-dominated bubbles born in the inner regions of a black hole accretion disk. Simple considerations suggest that the total mass ejected in the form of these bubbles is about that needed to account for the entire galactic inventory of the 2nd-peak r-process elements. We also argue that if collapsars are responsible for, e.g., Ag synthesis, then Ag abundances should be correlated with Sc and/or Zn abundances in metal-poor stars.

  20. Piperine, a component of black pepper, decreases eugenol-induced cAMP and calcium levels in non-chemosensory 3T3-L1 cells.

    Science.gov (United States)

    Yoon, Yeo Cho; Kim, Sung-Hee; Kim, Min Jung; Yang, Hye Jeong; Rhyu, Mee-Ra; Park, Jae-Ho

    2015-01-01

    This study investigated the effects of an ethanol extract of black pepper and its constituent, piperine, on odorant-induced signal transduction in non-chemosensory cells. An ethanol extract of black pepper decreased eugenol-induced cAMP and calcium levels in preadipocyte 3T3-L1 cells with no toxicity. Phosphorylation of CREB (cAMP response element-binding protein) was down-regulated by the black pepper extract. The concentration (133.8 mg/g) and retention time (5.5 min) of piperine in the ethanol extract were quantified using UPLC-MS/MS. Pretreatment with piperine decreased eugenol-induced cAMP and calcium levels in 3T3-L1 cells. Piperine also decreased the phosphorylation of CREB, which is up-regulated by eugenol. These results suggest that piperine inhibits the eugenol-induced signal transduction pathway through modulation of cAMP and calcium levels and phosphorylation of CREB in non-chemosensory cells.

  1. The cAMP Response Element Binding protein (CREB) is activated by Insulin-like Growth Factor-1 (IGF-1) and regulates myostatin gene expression in skeletal myoblast

    Energy Technology Data Exchange (ETDEWEB)

    Zuloaga, R. [Facultad de Ciencias Biológicas, Universidad Andres Bello, Santiago (Chile); Fuentes, E.N.; Molina, A. [Facultad de Ciencias Biológicas, Universidad Andres Bello, Santiago (Chile); Interdisciplinary Center for Aquaculture Research (INCAR), Víctor Lamas 1290, PO Box 160-C, Concepción (Chile); Valdés, J.A., E-mail: jvaldes@unab.cl [Facultad de Ciencias Biológicas, Universidad Andres Bello, Santiago (Chile); Interdisciplinary Center for Aquaculture Research (INCAR), Víctor Lamas 1290, PO Box 160-C, Concepción (Chile)

    2013-10-18

    Highlights: •IGF-1 induces the activation of CREB via IGF-1R/PI3K/PLC signaling pathway. •Calcium dependent signaling pathways regulate myostatin gene expression. •IGF-1 regulates myostatin gene expression via CREB transcription in skeletal myoblast. -- Abstract: Myostatin, a member of the Transforming Growth Factor beta (TGF-β) superfamily, plays an important role as a negative regulator of skeletal muscle growth and differentiation. We have previously reported that IGF-1 induces a transient myostatin mRNA expression, through the activation of the Nuclear Factor of Activated T cells (NFAT) in an IP{sub 3}/calcium-dependent manner. Here we examined the activation of CREB transcription factor as downstream targets of IGF-1 during myoblast differentiation and its role as a regulator of myostatin gene expression. In cultured skeletal myoblast, IGF-1 induced the phosphorylation and transcriptional activation of CREB via IGF-1 Receptor/Phosphatidylinositol 3-Kinase (PI3K)/Phospholipase C gamma (PLC γ), signaling pathways. Also, IGF-1 induced calcium-dependent molecules such as Calmodulin Kinase II (CaMK II), Extracellular signal-regulated Kinases (ERK), Protein Kinase C (PKC). Additionally, we examined myostatin mRNA levels and myostatin promoter activity in differentiated myoblasts stimulated with IGF-1. We found a significant increase in mRNA contents of myostatin and its reporter activity after treatment with IGF-1. The expression of myostatin in differentiated myoblast was downregulated by the transfection of siRNA–CREB and by pharmacological inhibitors of the signaling pathways involved in CREB activation. By using pharmacological and genetic approaches together these data demonstrate that IGF-1 regulates the myostatin gene expression via CREB transcription factor during muscle cell differentiation.

  2. 33 CFR Appendix D to Part 154 - Training Elements for Oil Spill Response Plans

    Science.gov (United States)

    2010-07-01

    .... Further, this section of the plan must work in harmony with those sections of the plan dealing with exercises, the spill management team, and the qualified individual. 1.3The material in this appendix D is... the elements that define the program as appropriate. 2.2An effective spill response training...

  3. 1,25-dihydroxyvitamin D3 suppresses renin gene transcription by blocking the activity of the cyclic AMP response element in the renin gene promoter.

    Science.gov (United States)

    Yuan, Weihua; Pan, Wei; Kong, Juan; Zheng, Wei; Szeto, Frances L; Wong, Kari E; Cohen, Ronald; Klopot, Anna; Zhang, Zhongyi; Li, Yan Chun

    2007-10-12

    We have shown that 1,25-dihydroxyvitamin D(3) (1,25(OH)(2)D(3)) down-regulates renin expression. To explore the molecular mechanism, we analyzed the mouse Ren-1c gene promoter by luciferase reporter assays. Deletion analysis revealed two DNA fragments from -2,725 to -2,647 (distal fragment) and from -117 to +6 (proximal fragment) that are sufficient to mediate the repression. Mutation of the cAMP response element (CRE) in the distal fragment blunted forskolin stimulation as well as 1,25(OH)(2)D(3) inhibition of the transcriptional activity, suggesting the involvement of CRE in 1,25(OH)(2)D(3)-induced suppression. EMSA revealed that 1,25(OH)(2)D(3) markedly inhibited nuclear protein binding to the CRE in the promoter. ChIP and GST pull-down assays demonstrated that liganded VDR blocked the binding of CREB to the CRE by directly interacting with CREB with the ligand-binding domain, and the VDR-mediated repression can be rescued by CREB, CBP, or p300 overexpression. These data indicate that 1,25(OH)(2)D(3) suppresses renin gene expression at least in part by blocking the formation of CRE-CREB-CBP complex.

  4. Exchange factors directly activated by cAMP mediate melanocortin 4 receptor-induced gene expression

    Science.gov (United States)

    Glas, Evi; Mückter, Harald; Gudermann, Thomas; Breit, Andreas

    2016-01-01

    Gs protein-coupled receptors regulate many vital body functions by activation of cAMP response elements (CRE) via cAMP-dependent kinase A (PKA)-mediated phosphorylation of the CRE binding protein (CREB). Melanocortin 4 receptors (MC4R) are prototypical Gs-coupled receptors that orchestrate the hypothalamic control of food-intake and metabolism. Remarkably, the significance of PKA for MC4R-induced CRE-dependent transcription in hypothalamic cells has not been rigorously interrogated yet. In two hypothalamic cell lines, we observed that blocking PKA activity had only weak or no effects on reporter gene expression. In contrast, inhibitors of exchange factors directly activated by cAMP-1/2 (EPAC-1/2) mitigated MC4R-induced CRE reporter activation and mRNA induction of the CREB-dependent genes c-fos and thyrotropin-releasing hormone. Furthermore, we provide first evidence that extracellular-regulated kinases-1/2 (ERK-1/2) activated by EPACs and not PKA are the elusive CREB kinases responsible for MC4R-induced CREB/CRE activation in hypothalamic cells. Overall, these data emphasize the pivotal role of EPACs rather than PKA in hypothalamic gene expression elicited by a prototypical Gs-coupled receptor. PMID:27612207

  5. Dynamic Stationary Response of Reinforced Plates by the Boundary Element Method

    Directory of Open Access Journals (Sweden)

    Luiz Carlos Facundo Sanches

    2007-01-01

    Full Text Available A direct version of the boundary element method (BEM is developed to model the stationary dynamic response of reinforced plate structures, such as reinforced panels in buildings, automobiles, and airplanes. The dynamic stationary fundamental solutions of thin plates and plane stress state are used to transform the governing partial differential equations into boundary integral equations (BIEs. Two sets of uncoupled BIEs are formulated, respectively, for the in-plane state (membrane and for the out-of-plane state (bending. These uncoupled systems are joined to form a macro-element, in which membrane and bending effects are present. The association of these macro-elements is able to simulate thin-walled structures, including reinforced plate structures. In the present formulation, the BIE is discretized by continuous and/or discontinuous linear elements. Four displacement integral equations are written for every boundary node. Modal data, that is, natural frequencies and the corresponding mode shapes of reinforced plates, are obtained from information contained in the frequency response functions (FRFs. A specific example is presented to illustrate the versatility of the proposed methodology. Different configurations of the reinforcements are used to simulate simply supported and clamped boundary conditions for the plate structures. The procedure is validated by comparison with results determined by the finite element method (FEM.

  6. Endothelial responses of magnesium and other alloying elements in magnesium-based stent materials

    Science.gov (United States)

    Zhao, Nan; Zhu, Donghui

    2016-01-01

    Biodegradable tailored magnesium (Mg) alloys are some of the most promising scaffolds for cardiovascular stents. During the course of degradation after implantation, all the alloying elements in the scaffold will be released to the surrounding vascular tissues. However, fundamental questions regarding the toxicity of alloying elements towards vascular cells, the maximum amount of each element that could be used in alloy design, or how each of the alloying elements affects vascular cellular activity and gene expression, are still not fully answered. This work systematically addressed these questions by revealing how application of different alloying elements commonly used in Mg stent materials influences several indices of human endothelial cell health, i.e., viability, proliferations, cytoskeletal reorganizations, migration, and the gene expression profile. The overall cell viability and proliferation showed a decreasing trend with increasing concentrations of the ions, and the half maximal effective concentrations (EC50) for each element were determined. When applied at a low concentration of around 10 mM, Mg had no adverse effects but improved cell proliferation and migration instead. Mg ions also altered endothelial gene expression significantly in a dose dependent manner. Most of the changed genes are related to angiogenesis and the cell adhesion signaling pathways. Findings from this work provide useful information on maximum safe doses of these ions for endothelial cells, endothelial responses towards these metal ions, and some guidance for future Mg stent design. PMID:25363018

  7. Huijia School Summer Camp Program

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    As an open and international educational institution, Beijing Huijia Private School is located in Changping, a scenic district in Beijing's northern suburb. In order to strengthen international cultural exchanges, promote the study of Chinese language and the spread of Chinese culture, and make the world know more about China, Huijia School regularly organizes various summer camps for students of different ages every year. Until now, we have already successfully received more than 1,000 students from hom...

  8. Targeting brain tumor cAMP: the case for sex-specific therapeutics

    Directory of Open Access Journals (Sweden)

    Nicole M Warrington

    2015-07-01

    Full Text Available A relationship between cyclic adenosine 3’, 5’-monophosphate (cAMP levels and brain tumor biology has been evident for nearly as long as cAMP and its synthetase, adenylate cyclase (ADCY have been known. The importance of the pathway in brain tumorigenesis has been demonstrated in vitro and in multiple animal models. Recently, we provided human validation for a cooperating oncogenic role for cAMP in brain tumorigenesis when we found that SNPs in ADCY8 were correlated with glioma (brain tumor risk in individuals with Neurofibromatosis type 1 (NF1. Together, these studies provide a strong rationale for targeting cAMP in brain tumor therapy. However, the cAMP pathway is well known to be sexually dimorphic, and SNPs in ADCY8 affected glioma risk in a sex-specific fashion, elevating the risk for females while protecting males. The cAMP pathway can be targeted at multiple levels in the regulation of its synthesis and degradation. Sex differences in response to drugs that target cAMP regulators indicate that successful targeting of the cAMP pathway for brain tumor patients is likely to require matching specific mechanisms of drug action with patient sex.

  9. Dynamic Response of a Planetary Gear System Using a Finite Element/Contact Mechanics Model

    Science.gov (United States)

    Parker, Robert G.; Agashe, Vinayak; Vijayakar, Sandeep M.

    2000-01-01

    The dynamic response of a helicopter planetary gear system is examined over a wide range of operating speeds and torques. The analysis tool is a unique, semianalytical finite element formulation that admits precise representation of the tooth geometry and contact forces that are crucial in gear dynamics. Importantly, no a priori specification of static transmission error excitation or mesh frequency variation is required; the dynamic contact forces are evaluated internally at each time step. The calculated response shows classical resonances when a harmonic of mesh frequency coincides with a natural frequency. However, peculiar behavior occurs where resonances expected to be excited at a given speed are absent. This absence of particular modes is explained by analytical relationships that depend on the planetary configuration and mesh frequency harmonic. The torque sensitivity of the dynamic response is examined and compared to static analyses. Rotation mode response is shown to be more sensitive to input torque than translational mode response.

  10. Creating Diversified Response Profiles from a Single Quenchometric Sensor Element by Using Phase-Resolved Luminescence

    Directory of Open Access Journals (Sweden)

    Elizabeth C. Tehan

    2015-01-01

    Full Text Available We report a new strategy for generating a continuum of response profiles from a single luminescence-based sensor element by using phase-resolved detection. This strategy yields reliable responses that depend in a predictable manner on changes in the luminescent reporter lifetime in the presence of the target analyte, the excitation modulation frequency, and the detector (lock-in amplifier phase angle. In the traditional steady-state mode, the sensor that we evaluate exhibits a linear, positive going response to changes in the target analyte concentration. Under phase-resolved conditions the analyte-dependent response profiles: (i can become highly non-linear; (ii yield negative going responses; (iii can be biphasic; and (iv can exhibit super sensitivity (e.g., sensitivities up to 300 fold greater in comparison to steady-state conditions.

  11. Creating Diversified Response Profiles from a Single Quenchometric Sensor Element by Using Phase-Resolved Luminescence

    Science.gov (United States)

    Tehan, Elizabeth C.; Bukowski, Rachel M.; Chodavarapu, Vamsy P.; Titus, Albert H.; Cartwright, Alexander N.; Bright, Frank V.

    2015-01-01

    We report a new strategy for generating a continuum of response profiles from a single luminescence-based sensor element by using phase-resolved detection. This strategy yields reliable responses that depend in a predictable manner on changes in the luminescent reporter lifetime in the presence of the target analyte, the excitation modulation frequency, and the detector (lock-in amplifier) phase angle. In the traditional steady-state mode, the sensor that we evaluate exhibits a linear, positive going response to changes in the target analyte concentration. Under phase-resolved conditions the analyte-dependent response profiles: (i) can become highly non-linear; (ii) yield negative going responses; (iii) can be biphasic; and (iv) can exhibit super sensitivity (e.g., sensitivities up to 300 fold greater in comparison to steady-state conditions). PMID:25569752

  12. An Extended Finite Element Method Formulation for Modeling the Response of Polycrystalline Materials to Dynamic Loading

    Science.gov (United States)

    Robbins, Joshua; Voth, Thomas E.

    2007-12-01

    The eXtended Finite Element Method (X-FEM) is a finite-element based discretization technique developed originally to model dynamic crack propagation [1]. Since that time the method has been used for modeling physics ranging from static meso-scale material failure to dendrite growth. Here we adapt the recent advances of Vitali and Benson [2] and Song et al. [3] to model dynamic loading of a polycrystalline material. We use demonstration problems to examine the method's efficacy for modeling the dynamic response of polycrystalline materials at the meso-scale. Specifically, we use the X-FEM to model grain boundaries. This approach allows us to i) eliminate ad-hoc mixture rules for multi-material elements and ii) avoid explicitly meshing grain boundaries.

  13. Response of hot element wall shear stress gages in laminar oscillating flows

    Science.gov (United States)

    Cook, W. J.; Murphy, J. D.; Giddings, T. A.

    1986-01-01

    An experimental investigation of the time-dependent response of hot element wall shear stress gages in unsteady periodic air flows is reported. The study has focused on wall shear stress in laminar oscillating flows produced on a flat plate by a free stream velocity composed of a mean component and a superposed sinusoidal variation. Two types of hot element gages, platinum film and flush wire, were tested for values of reduced frequency ranging from 0.14 to 2.36. Values of the phase angle of the wall shear stress variation relative to the free stream velocity, as indicated by the hot element gages, are compared with numerical prediction. The comparisons show that the gages indicate a wall shear stress variation that lags the true variation, and that the gages will also not indicate the correct wall shear stress variation in periodic turbulent flows.

  14. Verification of Advective Bar Elements Implemented in the Aria Thermal Response Code.

    Energy Technology Data Exchange (ETDEWEB)

    Mills, Brantley [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

    2016-01-01

    A verification effort was undertaken to evaluate the implementation of the new advective bar capability in the Aria thermal response code. Several approaches to the verification process were taken : a mesh refinement study to demonstrate solution convergence in the fluid and the solid, visually examining the mapping of the advective bar element nodes to the surrounding surfaces, and a comparison of solutions produced using the advective bars for simple geometries with solutions from commercial CFD software . The mesh refinement study has shown solution convergence for simple pipe flow in both temperature and velocity . Guidelines were provided to achieve appropriate meshes between the advective bar elements and the surrounding volume. Simulations of pipe flow using advective bars elements in Aria have been compared to simulations using the commercial CFD software ANSYS Fluent (r) and provided comparable solutions in temperature and velocity supporting proper implementation of the new capability. Verification of Advective Bar Elements iv Acknowledgements A special thanks goes to Dean Dobranich for his guidance and expertise through all stages of this effort . His advice and feedback was instrumental to its completion. Thanks also goes to Sam Subia and Tolu Okusanya for helping to plan many of the verification activities performed in this document. Thank you to Sam, Justin Lamb and Victor Brunini for their assistance in resolving issues encountered with running the advective bar element model. Finally, thanks goes to Dean, Sam, and Adam Hetzler for reviewing the document and providing very valuable comments.

  15. An extended finite element formulation for modeling the response of polycrystalline materials to shock loading

    Science.gov (United States)

    Robbins, Joshua; Voth, Thomas

    2007-06-01

    The eXtended Finite Element Method (X-FEM) is a finite element based discretization technique developed originally to model dynamic crack propagation [1]. Since that time the method has been used for modeling physics ranging from static mesoscale material failure to dendrite growth. Here we adapt the recent advances of Benson et al. [2] and Belytchko et al. [3] to model shock loading of polycrystalline material. Through several demonstration problems we evaluate the method for modeling the shock response of polycrystalline materials at the mesoscale. Specifically, we use the X-FEM to model grain boundaries. This approach allows us to i) eliminate ad-hoc mixture rules for multi-material elements and ii) avoid explicitly meshing grain boundaries. ([1] N. Moes, J. Dolbow, J and T. Belytschko, 1999,``A finite element method for crack growth without remeshing,'' International Journal for Numerical Methods in Engineering, 46, 131-150. [2] E. Vitali, and D. J. Benson, 2006, ``An extended finite element formulation for contact in multi-material arbitrary Lagrangian-Eulerian calculations,'' International Journal for Numerical Methods in Engineering, 67, 1420-1444. [3] J-H Song, P. M. A. Areias and T. Belytschko, 2006, ``A method for dynamic crack and shear band propagation with phantom nodes,'' International Journal for Numerical Methods in Engineering, 67, 868-893.)

  16. Mechanical stress induces biotic and abiotic stress responses via a novel cis-element.

    Directory of Open Access Journals (Sweden)

    Justin W Walley

    2007-10-01

    Full Text Available Plants are continuously exposed to a myriad of abiotic and biotic stresses. However, the molecular mechanisms by which these stress signals are perceived and transduced are poorly understood. To begin to identify primary stress signal transduction components, we have focused on genes that respond rapidly (within 5 min to stress signals. Because it has been hypothesized that detection of physical stress is a mechanism common to mounting a response against a broad range of environmental stresses, we have utilized mechanical wounding as the stress stimulus and performed whole genome microarray analysis of Arabidopsis thaliana leaf tissue. This led to the identification of a number of rapid wound responsive (RWR genes. Comparison of RWR genes with published abiotic and biotic stress microarray datasets demonstrates a large overlap across a wide range of environmental stresses. Interestingly, RWR genes also exhibit a striking level and pattern of circadian regulation, with induced and repressed genes displaying antiphasic rhythms. Using bioinformatic analysis, we identified a novel motif overrepresented in the promoters of RWR genes, herein designated as the Rapid Stress Response Element (RSRE. We demonstrate in transgenic plants that multimerized RSREs are sufficient to confer a rapid response to both biotic and abiotic stresses in vivo, thereby establishing the functional involvement of this motif in primary transcriptional stress responses. Collectively, our data provide evidence for a novel cis-element that is distributed across the promoters of an array of diverse stress-responsive genes, poised to respond immediately and coordinately to stress signals. This structure suggests that plants may have a transcriptional network resembling the general stress signaling pathway in yeast and that the RSRE element may provide the key to this coordinate regulation.

  17. Simulation of the ultrasonic array response from real branched cracks using an efficient finite element method

    Energy Technology Data Exchange (ETDEWEB)

    Felice, Maria V. [Department of Mechanical Engineering, University of Bristol, Bristol BS8 1TR, United Kingdom and Rolls-Royce plc., Bristol BS34 7QE (United Kingdom); Velichko, Alexander; Wilcox, Paul D. [Department of Mechanical Engineering, University of Bristol, Bristol BS8 1TR (United Kingdom); Barden, Tim J.; Dunhill, Tony K. [Rolls-Royce plc., Bristol BS34 7QE (United Kingdom)

    2014-02-18

    A hybrid model to simulate the ultrasonic array response from stress corrosion cracks is presented. These cracks are branched and difficult to detect so the model is required to enable optimization of an array design. An efficient frequency-domain finite element method is described and selected to simulate the ultrasonic scattering. Experimental validation results are presented, followed by an example of the simulated ultrasonic array response from a real stress corrosion crack whose geometry is obtained from an X-ray Computed Tomography image. A simulation-assisted array design methodology, which includes the model and use of real crack geometries, is proposed.

  18. Finite element simulation for mechanical response of surface mounted solder joints under different temperature cycling

    Institute of Scientific and Technical Information of China (English)

    马鑫; 钱乙余

    2001-01-01

    Nonlinear finite element simulation for mechanical response of surface mounted solder joint under different temperature cycling was carried out. Seven sets of parameters were used in order to evaluate the influence of temperature cycling profile parameters. The results show that temperature cycling history has significant effect on the stress response of the solder joint. Based on the concept of relative damage stress proposed by the authors, it is found that enough high temperature holding time is necessary for designing the temperature cycling profile in accelerated thermal fatigue test.

  19. Isolation of transcription factors binding auxin response elements using a yeast one-hybrid system

    Institute of Scientific and Technical Information of China (English)

    齐眉; 黄美娟; 陈凡

    2002-01-01

    Plant hormones play an important role during higher plant embryogenesis. Auxin is central to the development of vascular tissues, formation of lateral and adventitious roots, control of apical dominance, and tropic responses. Auxin response element (AuxRE), present in the promoters of many auxin-induced genes, can confer auxin responsiveness. Using carrot somatic embryo under specific developmental phase, a cDNA expression library was constructed. Several plasmids were recombined containing the tetramer of AuxRE as a bait. After screening by a yeast one-hy- brid system, one positive clone was confirmed and characterized. Electrophoretic mobility shift assay showed that AxRF1 protein expressed in yeast cell could bind AuxRE in vitro. It suggests that AxRF1 participates in regulation of the expression of auxin responsive gene during carrot somatic embryogenesis.

  20. cAMP receptor protein (CRP) downregulates Klebsiella pneumoniae nif promoters in Escherichia coli

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    In enteric bacteria, in response to the PTS system, the cAMP receptor protein (CRP) mediates the glucose effect, via regulating s70-dependent catabolic genes at transcriptional level. In this study, it is observed that the nitrogen fixation capacity of Klebsiella pneumoniae varies strongly when cells are grown on different carbohydrates, and this carbon effect occurs at the level of nif gene expression. Here we show that CRP can repress s54-dependent nif promoters (nifB, nifE, nifF, nifH, nifJ, nifLA and nifU), in a cAMP dependent fashion, in closed related E. coli background. Sequence analysis of these nif promoters indicates that there is no direct correlation between the fold of CRP-cAMP-mediated inhibition and the upstream cis elements at the promoters. In addition, the crp gene of K. pneumoniae has been isolated and sequenced, which is structural and functional highly homologous to that of E. coli. This suggests that CRP-cAMP-mediated inhibition on the nif promoters could be the reason for carbon effect on nitrogen fixation and thus has its physiological significance. A novel regulatory linkage between carbon metabolism and nitrogen fixation is proposed.

  1. Contingency Base Camp Solid Waste Generation

    Science.gov (United States)

    2013-09-01

    wastes gener- ated at Army base camps. The data in this report were obtained from solid waste characterization surveys of base camps in Bosnia, Kosovo ...ER D C/ CE RL T R- 13 -1 7 Contingency Base Camp Solid Waste Generation Co ns tr uc tio n En gi ne er in g R es ea rc h La bo ra to...Contingency Base Camp Solid Waste Generation Stephen D. Cosper, H. Garth Anderson, Kurt Kinnevan, and Byung J. Kim Construction Engineering Research

  2. A Novel Peroxisome Proliferator Response Element Modulates Hepatic Low Density Lipoprotein Receptor Gene Transcription in Response to PPARδ Activation

    Science.gov (United States)

    Shende, Vikram R.; Singh, Amar Bahadur; Liu, Jingwen

    2016-01-01

    The hepatic expression of LDLR gene is regulated primarily at the transcriptional level by a sterol-regulatory element (SRE) in its proximal promoter region which is the site of action of SRE-binding protein 2 (SREBP2). However whether additional cis-regulatory elements contribute to LDLR transcription has not been fully explored. We investigated the function of a putative PPAR-response element (PPRE) sequence motif located at −768 to −752 bases upstream of the transcription start site of human LDLR gene in response to PPARδ activation. Promoter luciferase reporter analyses showed that treating HepG2 cells with PPARδ agonist L165041 markedly increased the activity of a full-length LDLR promoter construct (pLDLR-1192) without any effects on the shorter promoter reporter pLDLR-234 that contains only the core regulatory elements SRE-1 and SP1 sites. Importantly, mutation of the PPRE sequence greatly attenuated the induction of the full-length LDLR promoter activity by L165041 without affecting rosuvastatin mediated transactivation. Electrophoretic mobility shift and chromatin immunoprecipitation assays further confirmed the binding of PPARδ to the LDLR-PPRE site. Treating HepG2 cells with L165041 elevated the mRNA and protein expressions of LDLR without affecting the LDLR mRNA decay rate. The induction of LDLR expression by PPARδ agonist was further observed in liver tissue of mice and hamsters treated with L165041. Altogether, our studies identify a novel PPRE-mediated regulatory mechanism for LDLR transcription and suggest that combined treatment of statin with PPARδ agonists may have advantageous effects on LDLR expression. PMID:26443862

  3. A novel peroxisome proliferator response element modulates hepatic low-density lipoprotein receptor gene transcription in response to PPARδ activation.

    Science.gov (United States)

    Shende, Vikram R; Singh, Amar Bahadur; Liu, Jingwen

    2015-12-15

    The hepatic expression of low-density lipoprotein (LDL) receptor (LDLR) gene is regulated primarily at the transcriptional level by a sterol-regulatory element (SRE) in its proximal promoter region which is the site of action of SRE-binding protein 2 (SREBP2). However whether additional cis-regulatory elements contribute to LDLR transcription has not been fully explored. We investigated the function of a putative peroxisome proliferator-activated receptor (PPAR)-response element (PPRE) sequence motif located at -768 to -752 bases upstream of the transcription start site of human LDLR gene in response to PPARδ activation. Promoter luciferase reporter analyses showed that treating HepG2 cells with PPARδ agonist L165041 markedly increased the activity of a full-length LDLR promoter construct (pLDLR-1192) without any effects on the shorter promoter reporter pLDLR-234 that contains only the core regulatory elements SRE-1 and SP1 sites. Importantly, mutation of the PPRE sequence greatly attenuated the induction of the full-length LDLR promoter activity by L165041 without affecting rosuvastatin (RSV)-mediated transactivation. EMSA and ChIP assay further confirmed the binding of PPARδ to the LDLR-PPRE site. Treating HepG2 cells with L165041 elevated the mRNA and protein expressions of LDLR without affecting the LDLR mRNA decay rate. The induction of LDLR expression by PPARδ agonist was further observed in liver tissue of mice and hamsters treated with L165041. Altogether, our studies identify a novel PPRE-mediated regulatory mechanism for LDLR transcription and suggest that combined treatment of statin with PPARδ agonists may have advantageous effects on LDLR expression.

  4. Equivalent Dynamic Stiffness Mapping technique for identifying nonlinear structural elements from frequency response functions

    Science.gov (United States)

    Wang, X.; Zheng, G. T.

    2016-02-01

    A simple and general Equivalent Dynamic Stiffness Mapping technique is proposed for identifying the parameters or the mathematical model of a nonlinear structural element with steady-state primary harmonic frequency response functions (FRFs). The Equivalent Dynamic Stiffness is defined as the complex ratio between the internal force and the displacement response of unknown element. Obtained with the test data of responses' frequencies and amplitudes, the real and imaginary part of Equivalent Dynamic Stiffness are plotted as discrete points in a three dimensional space over the displacement amplitude and the frequency, which are called the real and the imaginary Equivalent Dynamic Stiffness map, respectively. These points will form a repeatable surface as the Equivalent Dynamic stiffness is only a function of the corresponding data as derived in the paper. The mathematical model of the unknown element can then be obtained by surface-fitting these points with special functions selected by priori knowledge of the nonlinear type or with ordinary polynomials if the type of nonlinearity is not pre-known. An important merit of this technique is its capability of dealing with strong nonlinearities owning complicated frequency response behaviors such as jumps and breaks in resonance curves. In addition, this technique could also greatly simplify the test procedure. Besides there is no need to pre-identify the underlying linear parameters, the method uses the measured data of excitation forces and responses without requiring a strict control of the excitation force during the test. The proposed technique is demonstrated and validated with four classical single-degree-of-freedom (SDOF) numerical examples and one experimental example. An application of this technique for identification of nonlinearity from multiple-degree-of-freedom (MDOF) systems is also illustrated.

  5. Validation of an interferon stimulatory response element reporter gene assay for quantifying type I interferons.

    Science.gov (United States)

    McCoski, S R; Xie, M; Hall, E B; Mercadante, P M; Spencer, T E; Lonergan, P; Ealy, A D

    2014-04-01

    The goal of this work was to develop a virus-free, cell-based interferon (IFN) bioassay and determine the utility of this assay on biological samples that contained IFN-τ, the trophoblast-secreted maternal recognition of pregnancy factor in ruminants. Madin-Darby bovine kidney cells were transduced with lentiviral particles that contained a firefly luciferase reporter construct driven by an IFN stimulatory response element (ISRE). Stably transduced cells were selected with the use of puromycin resistance. A linear, dose-responsive response was detected with human IFN-α and ovine IFN-τ. Interferon activity was detected in conditioned media from bovine trophoblast cells and uterine flushes collected from sheep and cattle. Activity also was detected in media collected after individual or small group culture of in vitro-produced bovine blastocysts at day 8 to 10 after fertilization. In summary, this IFN stimulatory response element-reporter assay may be used as an alternative to virus-dependent, cytopathic assays. It contains a similar sensitivity to IFNs and can be completed in a shorter time than cytopathic assays and does not require heightened biosafety conditions after cell transduction.

  6. Writing and Teaching behind Barbed Wire: An Exiled Composition Class in a Japanese-American Internment Camp

    Science.gov (United States)

    Wu, Hui

    2007-01-01

    By reflecting on Japanese internment camps executed by the U.S. government in World War II, this article examines camp schools' curricula and writing assignments and an English teacher's response to student essays to show how racially profiled students and their Caucasian teacher negotiated the political meanings of civil rights and freedom.…

  7. Analysis of Resonance Response Performance of C-Band Antenna Using Parasitic Element

    Directory of Open Access Journals (Sweden)

    M. R. Zaman

    2014-01-01

    Full Text Available Analysis of the resonance response improvement of a planar C-band (4–8 GHz antenna is proposed using parasitic element method. This parasitic element based method is validated for change in the active and parasitic antenna elements. A novel dual-band antenna for C-band application covering 5.7 GHz and 7.6 GHz is designed and fabricated. The antenna is composed of circular parasitic element with unequal microstrip lines at both sides and a rectangular partial ground plane. A fractional bandwidth of 13.5% has been achieved from 5.5 GHz to 6.3 GHz (WLAN band for the lower band. The upper band covers from 7.1 GHz to 8 GHz with a fractional bandwidth of 12%. A gain of 6.4 dBi is achieved at the lower frequency and 4 dBi is achieved at the upper frequency. The VSWR of the antenna is less than 2 at the resonance frequency.

  8. Finite element simulation of rate-dependent magneto-active polymer response

    Science.gov (United States)

    Haldar, K.; Kiefer, B.; Menzel, A.

    2016-10-01

    This contribution is concerned with the embedding of constitutive relations for magneto-active polymers (MAP) into finite element simulations. To this end, a recently suggested, calibrated, and validated material model for magneto-mechanically coupled and rate-dependent MAP response is briefly summarized in its continuous and algorithmic settings. Moreover, the strongly coupled field equations of finite deformation magneto-mechanics are reviewed. For the purpose of numerical simulation, a finite element model is then established based on the usual steps of weak form representation, discretization and consistent linearization. Two verifying inhomogeneous numerical examples are presented in which a classical ‘plate with a hole’ geometry is equipped with MAP properties and subjected to different types of time-varying mechanical and magnetic loading.

  9. Identification of peroxisome-proliferator responsive element in the mouse HSL gene.

    Science.gov (United States)

    Yajima, Hiroaki; Kobayashi, Yumie; Kanaya, Tomoka; Horino, Yoko

    2007-01-12

    Hormone-sensitive lipase (HSL) catalyzes the rate-limiting step of lipolysis in adipose tissue. Several studies suggest that protein phosphorylation regulates the HSL enzymatic activity. On the other hand, the precise mechanism of the transcriptional regulation of the HSL gene remains to be elucidated. Here, we identified a functional peroxisome-proliferator responsive element (PPRE) in the mouse HSL promoter by reporter assay in CV-1 cells using serial deletion and point mutants of the 5'-flanking region. Chromatin immunoprecipitation (ChIP) analysis revealed that both peroxisome-proliferator activated receptor (PPARgamma) and retinoid X receptor (RXRalpha) interacted with the region. Binding of the PPARgamma/RXRalpha heterodimer to the PPRE sequence was also confirmed by electrophoretic mobility shift assay. These results indicate that the HSL gene is transcriptionally regulated by PPARgamma/RXRalpha heterodimer, and suggest that a cis-acting element regulates the HSL gene expression.

  10. AN ENHANCED ELEMENT-FREE GALERKIN METHOD FOR DYNAMIC RESPONSE OF POROELASTIC SEABED

    Institute of Scientific and Technical Information of China (English)

    HUA Lei-na; YU Xi-ping

    2009-01-01

    This study presents an effective numerical model for the dynamic response of poroelastic seabed under wave action with enhanced performance. The spatial discretization is based on the Element-Free Galerkin (EFG) method and the time integration based on the GN11 scheme. A stability strategy that adopts a smaller number of nodes for the pore water pressure compared with those for the displacements of the soil skeleton is suggested to resolve the similar difficulty as encountered in the finite element method for a problem with mixed formulation when the pore water is incompressible and the soil skeleton impervious. The accuracy of the numerical model is verified through applying it to a typical case with critical permeability. Good agreement between computational and analytical solutions is obtained.

  11. Effects of rare earth elements and REE-binding proteins on physiological responses in plants.

    Science.gov (United States)

    Liu, Dongwu; Wang, Xue; Chen, Zhiwei

    2012-02-01

    Rare earth elements (REEs), which include 17 elements in the periodic table, share chemical properties related to a similar external electronic configuration. REEs enriched fertilizers have been used in China since the 1980s. REEs could enter the cell and cell organelles, influence plant growth, and mainly be bound with the biological macromolecules. REE-binding proteins have been found in some plants. In addition, the chlorophyll activities and photosynthetic rate can be regulated by REEs. REEs could promote the protective function of cell membrane and enhance the plant resistance capability to stress produced by environmental factors, and affect the plant physiological mechanism by regulating the Ca²⁺ level in the plant cells. The focus of present review is to describe how REEs and REE-binding proteins participate in the physiological responses in plants.

  12. How to run a successful and educational basketball camp

    OpenAIRE

    Brooke LeMar; Joe Deutsch

    2015-01-01

    Camps are a great introduction to the sport of basketball for children. Universities and colleges usually offer different types of camps, typically during the summer months. Depending on the skill and maturity level of the player, basketball camps can serve a variety of purposes. Some popular types of camps include offensive skills, shooting, team, and youth camps. Regardless of the camp that is chosen, children need to have goals set for themselves before, during, and after to enhance the be...

  13. Mental health in Palestinian camps in Lebanon

    Directory of Open Access Journals (Sweden)

    Fabio Forgione

    2012-08-01

    Full Text Available Health agencies in refugee camps face the dual challenge of, firstly,convincing both camp populations and the international communitythat mental health disorders deserve treatment as much as any otherillness – and, secondly, building enough trust to encourage people toseek that treatment.

  14. Children with Cancer: Positive Benefits of Camp.

    Science.gov (United States)

    Winfree, Christy; Williams, Richard; Powell, Gwynn M.

    2002-01-01

    A relatively new method of helping pediatric cancer patients cope with their illness is specially designed summer camps. Camp helps children with cancer address psychological effects of the disease, bodily changes, and self-concept, and helps parents and siblings cope. Sidebars present resources and tips on incorporating children with cancer into…

  15. Why It's Good to Go to Camp

    Science.gov (United States)

    Howell, Matthew

    2008-01-01

    In the author's fourth year of undergraduate studies at the University of Waterloo he had the opportunity to explore the benefits attained by children attending a summer camp by way of an academic literature review. The author worked with Dr. Troy Glover who has been commissioned by a group of camping associations to perform a study on the…

  16. Accounting Boot Camp for College Juniors

    Science.gov (United States)

    Myring, Mark; Wrege, William; Van Alst, Lucinda

    2008-01-01

    We describe a day-long introduction to new accounting majors, which we call a boot camp. Boot camp it is an effort to make juniors more aware of their identity, career purposes and learning resources that are now parts of their world, much of which is not covered explicitly in the accounting curriculum. This paper provides an overview of the…

  17. Modulation of the cAMP signaling pathway after traumatic brain injury

    OpenAIRE

    Atkins, Coleen M.; Oliva, Anthony A.; Alonso, Ofelia F.; Pearse, Damien D.; Bramlett, Helen M; Dietrich, W. Dalton

    2007-01-01

    Traumatic brain injury (TBI) results in both focal and diffuse brain pathologies that are exacerbated by the inflammatory response and progress from hours to days after the initial injury. Using a clinically relevant model of TBI, the parasagittal fluid-percussion brain injury (FPI) model, we found injury-induced impairments in the cyclic AMP (cAMP) signaling pathway. Levels of cAMP were depressed in the ipsilateral parietal cortex and hippocampus, as well as activation of its downstream targ...

  18. ESTCP Live Site Demonstrations Former Camp Beale, Marysville, CA

    Science.gov (United States)

    2011-08-23

    31  Figure 10-1 – Management and Staffing Wiring Diagram . ...........................................................32  Tables Table...the completion of the demonstration. The schedule of field testing activities is provided in Figure 5-1 as a Gantt chart. Activity Name 5 12 19...Management and Staffing Wiring Diagram . 32 33 11.0 REFERENCES 1. “ESTCP Munitions Response, Live Site Demonstrations, former Camp Beale, CA

  19. Opening of a summer camp at CERN

    CERN Multimedia

    Nursery School

    2015-01-01

    The Staff Association has the pleasure to announce the opening of a summer camp in l’EVE et Ecole de l’AP du CERN. With a capacity of 40 children, aged 4 to 6 years, it will be open from July 6 to 30. Registration Summer camp 2015 Registration for the CERN SA Summer camp for children aged 4 to 6 is open 16 to 30 April 2015 More information on the website: http://nurseryschool.web.cern.ch/ The Summer camp is open to all children of CERN Staff. An inscription per week is proposed, cost 480.-CHF/week, lunch included. The camp will be open weeks 28, 29, 30 and 31, from 8:30 am to 5:30 pm.

  20. Differential interactions of promoter elements in stress responses of the Arabidopsis Adh gene.

    Science.gov (United States)

    Dolferus, R; Jacobs, M; Peacock, W J; Dennis, E S

    1994-01-01

    The Adh (alcohol dehydrogenase, EC 1.1.1.1.) gene from Arabidopsis thaliana (L.) Heynh. can be induced by dehydration and cold, as well as by hypoxia. A 1-kb promoter fragment (CADH: -964 to +53) is sufficient to confer the stress induction and tissue-specific developmental expression characteristics of the Adh gene to a beta-glucuronidase reporter gene. Deletion mapping of the 5' end and site-specific mutagenesis identified four regions of the promoter essential for expression under the three stress conditions. Some sequence elements are important for response to all three stress treatments, whereas others are stress specific. The most critical region essential for expression of the Arabidopsis Adh promoter under all three environmental stresses (region IV: -172 to -141) contains sequences homologous to the GT motif (-160 to -152) and the GC motif (-147 to -144) of the maize Adh1 anaerobic responsive element. Region III (-235 to -172) contains two regions shown by R.J. Ferl and B.H. Laughner ([1989] Plant Mol Biol 12: 357-366) to bind regulatory proteins; mutation of the G-box-1 region (5'-CCACGTGG-3', -216 to -209) does not affect expression under uninduced or hypoxic conditions, but significantly reduces induction by cold stress and, to a lesser extent, by dehydration stress. Mutation of the other G-box-like sequence (G-box-2: 5'-CCAAGTGG-3', -193 to -182) does not change hypoxic response and affects cold and dehydration stress only slightly. G-box-2 mutations also promote high levels of expression under uninduced conditions. Deletion of region I (-964 to -510) results in increased expression under uninduced and all stress conditions, suggesting that this region contains a repressor binding site. Region II (-510 to -384) contains a positive regulatory element and is necessary for high expression levels under all treatments. PMID:7972489

  1. Multiple Facets of cAMP Signalling and Physiological Impact: cAMP Compartmentalization in the Lung

    Directory of Open Access Journals (Sweden)

    Martina Schmidt

    2012-11-01

    Full Text Available Therapies involving elevation of the endogenous suppressor cyclic AMP (cAMP are currently used in the treatment of several chronic inflammatory disorders, including chronic obstructive pulmonary disease (COPD. Characteristics of COPD are airway obstruction, airway inflammation and airway remodelling, processes encompassed by increased airway smooth muscle mass, epithelial changes, goblet cell and submucosal gland hyperplasia. In addition to inflammatory cells, airway smooth muscle cells and (myofibroblasts, epithelial cells underpin a variety of key responses in the airways such as inflammatory cytokine release, airway remodelling, mucus hypersecretion and airway barrier function. Cigarette smoke, being next to environmental pollution the main cause of COPD, is believed to cause epithelial hyperpermeability by disrupting the barrier function. Here we will focus on the most recent progress on compartmentalized signalling by cAMP. In addition to G protein-coupled receptors, adenylyl cyclases, cAMP-specific phospho-diesterases (PDEs maintain compartmentalized cAMP signalling. Intriguingly, spatially discrete cAMP-sensing signalling complexes seem also to involve distinct members of the A-kinase anchoring (AKAP superfamily and IQ motif containing GTPase activating protein (IQGAPs. In this review, we will highlight the interaction between cAMP and the epithelial barrier to retain proper lung function and to alleviate COPD symptoms and focus on the possible molecular mechanisms involved in this process. Future studies should include the development of cAMP-sensing multiprotein complex specific disruptors and/or stabilizers to orchestrate cellular functions. Compartmentalized cAMP signalling regulates important cellular processes in the lung and may serve as a therapeutic target.

  2. [Medicine in the concentration camps of the Third Reich].

    Science.gov (United States)

    Shasha, Shaul M

    2005-04-01

    Between 1942 and 1944 millions of prisoners were subjected to forced labor in concentration camps throughout the Third Reich, all the while being the victims of a systematic and "scientific" extermination policy. Though the policy was directed mainly against Jews, it was implemented against other "inferior races" as well. The prisoners, stripped of all rights, experienced constant humiliation, uncertain survival and terror. The harsh living condition, characterized by crowding, absent sanitation and poor personal hygiene led to considerable morbidity, mainly due to injuries, infectious diseases and famine, and to high mortality rates. Medical care in the camps was the responsibility of the S.S. Each camp had a chief S.S. physician accompanied by a number of assistants and orderlies. There was also a parallel system of "prisoner-physicians." There was a chief prisoner-physician in every camp, and each block was assigned a "block doctor" who was responsible for sanitation, the removal of corpses, setting up the sick- call and authorizing sick leave. Work teams were accompanied by "mobile doctors" (Streckenpfleger), who dispensed first aid for work injuries. Prisoner-physicians were also charged with disinfecting the blocks and maintaining hygienic conditions in the camp. Every camp had one or more blocks, called "Reviers", that were used for treatment and hospitalization. In the larger camps a number of blocks were designated to function as a sort of hospital (Krankenbau). At times one camp out of a group of camps would be set aside as quarantine, primarily for patients with infectious diseases. Officially, the "Revier" was the responsibility of an S.S. physicians', assisted by a chief prisoner-physician, his assistants and, at times, nurses. But in actuality the Reviers were managed by prisoners (Capos) who did not have medical training but were authorized to make decisions in medical matters such as operations and, on occasion, even performed them. The Reviers

  3. LAS0811: From Combinatorial Chemistry to Activation of Antioxidant Response Element

    OpenAIRE

    Ming Zhu; Hyounggee Baek; Ruiwu Liu; Aimin Song; Kit Lam; Derick Lau

    2009-01-01

    The antioxidant response element (ARE) and its transcription factor, nuclear factor-erythroid 2 p45-related factor 2 (Nrf2), are potential targets for cancer chemoprevention. We sought to screen small molecules synthesized with combinatorial chemistry for activation of ARE. By high-throughput screening of 9400 small molecules from 10 combinatorial chemical libraries using HepG2 cells with an ARE-driven reporter, we have identified a novel small molecule, 1,2-dimethoxy-4,5-dinitrobenzene (LAS0...

  4. Identification of putative PPAR response elements in and around the murine UCP3 gene

    DEFF Research Database (Denmark)

    Siersbæk, Majken

    in thermogenesis in unerring, the physiological functions of UCP2 and UCP3 are at present not fully understood. Synthetic agonists for the peroxisome proliferator-activated receptors (PPARs) as well as fatty acids have been shown to increase murine UCP2 and UCP3 mRNA expression but response elements and mechanisms...... differentiation. Results from sequencing of chromatin immunoprecipitated (ChIP) material from 3T3-L1 adipocytes revealed three PPAR and retinoid X receptor (RXR) binding sites in and around the murine UCP3 gene. The recruitment of PPAR and RXR to the three potential PPREs was determined by ChIP combined...

  5. On the structure of AP-4 responsive element in the LTR of Jembrana disease virus

    Institute of Scientific and Technical Information of China (English)

    2003-01-01

    Previous studies with deletion and sequence analysis of JDV LTR showed that there is a putative AP-4 responsive element in LTR. By antisense transient assay and gel shifting assay, we for the first time demonstrated that AP-4 modulated JDV gene expression by binding DNA directly to bovine cells. The results, derived from site-directed mutagenesis experiments, suggest that the six base pairs of AP-4 binding site (CAGCTG) have different effects on JDV gene expression. When the first two base pairs changed to GC, JDV gene expression is severely decreased.

  6. Spatial Finite Element Analysis for Dynamic Response of Curved Thin-Walled Box Girder Bridges

    Directory of Open Access Journals (Sweden)

    Yinhui Wang

    2016-01-01

    Full Text Available According to the flexural and torsional characteristics of curved thin-walled box girder with the effect of initial curvature, 7 basic displacements of curved box girder are determined. And then the strain-displacement calculation correlations were established. Under the curvilinear coordinate system, a three-noded curved girder finite element which has 7 degrees of freedom per node for the vibration characteristic and dynamic response analysis of curved box girder is constructed. The shape functions are used as the interpolation functions of variable curvature and variable height to accommodate to the variation of curvature and section height. A MATLAB numerical analysis program has been implemented.

  7. The antioxidant responsive element (ARE) may explain the protective effects of cruciferous vegetables on cancer.

    Science.gov (United States)

    Finley, John W

    2003-07-01

    Research supports the hypothesis that one's diet has a great impact on his or her risk of cancer. Many studies have found that increased fruit and vegetable intake decreases the risk of cancer. Cruciferous vegetables such as broccoli and cauliflower seem to be especially protective against cancer. Most studies show that phytochemicals in crucifers up-regulate many detoxification enzyme systems in the animal that consumes them. Recent reports of the molecular events involved in the activation of a gene promoter called the antioxidant responsive element have begun to provide clues as to how a single substance may induce a battery of many genes.

  8. Genetically-encoded yellow fluorescent cAMP indicator with an expanded dynamic range for dual-color imaging.

    Directory of Open Access Journals (Sweden)

    Haruki Odaka

    Full Text Available Cyclic AMP is a ubiquitous second messenger, which mediates many cellular responses mainly initiated by activation of cell surface receptors. Various Förster resonance energy transfer-based ratiometric cAMP indicators have been created for monitoring the spatial and temporal dynamics of cAMP at the single-cell level. However, single fluorescent protein-based cAMP indicators have been poorly developed, with improvement required for dynamic range and brightness. Based on our previous yellow fluorescent protein-based cAMP indicator, Flamindo, we developed an improved yellow fluorescent cAMP indicator named Flamindo2. Flamindo2 has a 2-fold expanded dynamic range and 8-fold increased brightness compared with Flamindo by optimization of linker peptides in the vicinity of the chromophore. We found that fluorescence intensity of Flamindo2 was decreased to 25% in response to cAMP. Live-cell cAMP imaging of the cytosol and nucleus in COS7 cells using Flamindo2 and nlsFlamindo2, respectively, showed that forskolin elevated cAMP levels in each compartment with different kinetics. Furthermore, dual-color imaging of cAMP and Ca2+ with Flamindo2 and a red fluorescent Ca2+ indicator, R-GECO, showed that cAMP and Ca2+ elevation were induced by noradrenaline in single HeLa cells. Our study shows that Flamindo2, which is feasible for multi-color imaging with other intracellular signaling molecules, is useful and is an alternative tool for live-cell imaging of intracellular cAMP dynamics.

  9. Genetically-Encoded Yellow Fluorescent cAMP Indicator with an Expanded Dynamic Range for Dual-Color Imaging

    Science.gov (United States)

    Odaka, Haruki; Arai, Satoshi; Inoue, Takafumi; Kitaguchi, Tetsuya

    2014-01-01

    Cyclic AMP is a ubiquitous second messenger, which mediates many cellular responses mainly initiated by activation of cell surface receptors. Various Förster resonance energy transfer-based ratiometric cAMP indicators have been created for monitoring the spatial and temporal dynamics of cAMP at the single-cell level. However, single fluorescent protein-based cAMP indicators have been poorly developed, with improvement required for dynamic range and brightness. Based on our previous yellow fluorescent protein-based cAMP indicator, Flamindo, we developed an improved yellow fluorescent cAMP indicator named Flamindo2. Flamindo2 has a 2-fold expanded dynamic range and 8-fold increased brightness compared with Flamindo by optimization of linker peptides in the vicinity of the chromophore. We found that fluorescence intensity of Flamindo2 was decreased to 25% in response to cAMP. Live-cell cAMP imaging of the cytosol and nucleus in COS7 cells using Flamindo2 and nlsFlamindo2, respectively, showed that forskolin elevated cAMP levels in each compartment with different kinetics. Furthermore, dual-color imaging of cAMP and Ca2+ with Flamindo2 and a red fluorescent Ca2+ indicator, R-GECO, showed that cAMP and Ca2+ elevation were induced by noradrenaline in single HeLa cells. Our study shows that Flamindo2, which is feasible for multi-color imaging with other intracellular signaling molecules, is useful and is an alternative tool for live-cell imaging of intracellular cAMP dynamics. PMID:24959857

  10. Analysis of nonexponential transient response due to a constant-phase element

    Energy Technology Data Exchange (ETDEWEB)

    Heuveln, F.H. van (Netherlands Energy Research Foundation, Petten (Netherlands))

    1994-12-01

    To characterize electrical losses of fuel cells or batteries, impedance spectroscopy (IS) or current interruption (CI) can be used. Analysis and parameter determination of impedance data is widely used. The system under study is usually represented by an equivalent circuit from which the system parameters can be determined. However, the analysis of current-interruption data is often carried out with too simple circuits, e.g., using pure exponential behavior, because analysis in the time domain (CI) is often much more awkward than analysis in the frequency domain (IS). A comparative study has been carried out on the analysis of a relatively ideal electrical circuit, containing a pure capacitor, and a more realistic circuit where the capacitor is replaced by a constant-phase element. Equations describing the response in the frequency and time domain are presented. Emphasis input upon the analysis of circuits containing a constant-phase element because impedance measurements clearly indicate the presence of such an element in many types of experiments, and because there is only limited literature available describing the behavior in the time domain.

  11. Analysis of non-exponential transient response due to a constant phase element

    Energy Technology Data Exchange (ETDEWEB)

    Van Heuveln, F.H.

    1994-08-01

    To characterize electrical losses of fuel cells or batteries, impedance spectroscopy (IS) or current interruption (CI) can be used. Analysis and parameter determination of impedance data is widely used. The system under study is usually represented by an equivalent circuit from which the system parameters can be determined. However, the analysis of current interruption data is often carried out with too simple circuits, e.g., using pure exponential behavior, because analysis in the time domain (CI) is often much more awkward then analysis in the frequency domain (IS). A comparative study has been carried out on the analysis of a relatively ideal electrical circuit, containing a pure capacitor, and a more realistic circuit where the capacitor is replaced by a constant phase element. Equations describing the response in the frequency and time domain are presented. Emphasis is put upon the analysis of circuits containing a constant phase element, because impedance measurements clearly indicate the presence of such an element in many types of experiments, and because there is only limited literature available describing the behavior in the time domain. 6 figs., 11 refs.

  12. Core influence on the frequency response analysis (FRA of power transformers through the finite element method

    Directory of Open Access Journals (Sweden)

    D. L. Alvarez

    2015-11-01

    Full Text Available In this paper the influence of core parameters in Frequency Response Analysis is analyzed through the equivalent circuit impedance matrix of the transformer winding; the parameters of the circuit have been computed using the Finite Element Method. In order to appreciate the behavior of the iron core in comparison to the air core, the frequency dependence of resonances is calculated to show how the air core only influences the results at low frequencies. The core is modeled using a complex permeability, and the parameters of conductivity and permeability are varied to show their influence in the resonances, which turned out to be negligible. In order to explain this behavior, the eigenvalues of the inverse impedance matrix are calculated showing that they are similar for different values of conductivity and permeability. Finally, the magnetic flux inside and outside the core and its influence in the frequency response is studied.

  13. Signal transduction in Dictyostelium fgd A mutants with a defective interaction between surface cAMP receptors and a GTP-binding regulatory protein [published erratum appears in J Cell Biol 1988 Dec;107(6 Pt 1):following 2463

    OpenAIRE

    1988-01-01

    Transmembrane signal transduction was investigated in four Dictyostelium discoideum mutants that belong to the fgd A complementation group. The results show the following. (a) Cell surface cAMP receptors are present in fgd A mutants, but cAMP does not induce any of the intracellular responses, including the activation of adenylate or guanylate cyclase and chemotaxis. (b) cAMP induces down- regulation and the covalent modification (presumably phosphorylation) of the cAMP receptor. (c) The inhi...

  14. Molecular cloning and expression of chicken carbohydrate response element binding protein and Max-like protein X gene homologues

    Science.gov (United States)

    Carbohydrate response element binding protein (ChREBP) and sterol regulatory element binding protein-1c (SREBP-1c) are transcription factors that are known to be key regulators of glucose metabolism and lipid synthesis in mammals. Since ChREBP and its co-activator Max-like protein X (Mlx) have not ...

  15. A CYCLIC-AMP RESPONSE ELEMENT IS INVOLVED IN RETINOIC ACID-DEPENDENT RAR-BETA-2 PROMOTER ACTIVATION

    NARCIS (Netherlands)

    KRUYT, FAE; FOLKERS, G; VANDENBRINK, CE; VANDERSAAG, PT; Kruyt, Frank

    1992-01-01

    Activation of the retinoic acid receptor (RAR) beta2 promoter is known to be mediated by a RA response element located in the proximity of the TATA-box. By deletion studies in P19 embryonal carcinoma cells we have analyzed the RARbeta2 promoter for the presence of additional regulatory elements. We

  16. Generation solar case study : solar summer camp

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2008-07-01

    This document presented a case study of the use of solar power at camp Tanamakoon in Ontario's Algonquin Park. It discussed camp facilities which include solar powered composting toilets and solar heated showers. Composting, recycling, and use of environmentally friendly products were also discussed. The camp also has a grid interactive solar electric system and a solar water heating system. The solar electric system provides backup power to critical loads such as safety lights and an emergency fridge and is also connected to the existing grid electricity system. Any excess energy from the solar system can be used by other kitchen appliances or, any other load anywhere in the camp. The main user of the solar heated water is a large automatic dishwasher which has as a built-in boost heater for those days when the solar heated water is insufficiently hot to sanitize dishes. It was concluded that while camp utility bills have been reduced by this investment in renewable energy technology, the primary objectives of the project were the protection of Tanamakoon's pristine Algonquin environment and the attraction and retention of clients for the camp by enhancing the camping experience. fig.

  17. Effects of Frequency and Acceleration Amplitude on Osteoblast Mechanical Vibration Responses: A Finite Element Study

    Directory of Open Access Journals (Sweden)

    Liping Wang

    2016-01-01

    Full Text Available Bone cells are deformed according to mechanical stimulation they receive and their mechanical characteristics. However, how osteoblasts are affected by mechanical vibration frequency and acceleration amplitude remains unclear. By developing 3D osteoblast finite element (FE models, this study investigated the effect of cell shapes on vibration characteristics and effect of acceleration (vibration intensity on vibrational responses of cultured osteoblasts. Firstly, the developed FE models predicted natural frequencies of osteoblasts within 6.85–48.69 Hz. Then, three different levels of acceleration of base excitation were selected (0.5, 1, and 2 g to simulate vibrational responses, and acceleration of base excitation was found to have no influence on natural frequencies of osteoblasts. However, vibration response values of displacement, stress, and strain increased with the increase of acceleration. Finally, stress and stress distributions of osteoblast models under 0.5 g acceleration in Z-direction were investigated further. It was revealed that resonance frequencies can be a monotonic function of cell height or bottom area when cell volumes and material properties were assumed as constants. These findings will be useful in understanding how forces are transferred and influence osteoblast mechanical responses during vibrations and in providing guidance for cell culture and external vibration loading in experimental and clinical osteogenesis studies.

  18. Linking cellular actin status with cAMP signaling in Candida albicans.

    Science.gov (United States)

    Wang, Yue; Zou, Hao; Fang, Hao-Ming; Zhu, Yong

    2010-01-01

    The fungal pathogen Candida albicans has a remarkable ability to switch growth forms. Particularly, the yeast-to-hyphae switch is closely linked with its virulence. A range of chemicals and conditions can promote hyphal growth including serum, peptidoglycan, CO2, neutral pH, and elevated temperature. All these signals act essentially through the adenylyl cyclase Cyr1 that synthesizes cAMP. Cells lacking Cyr1 are completely defective in hyphal growth. Recently, cellular actin status is found to influence cAMP synthesis. However, how Cyr1 senses and processes multiple external and internal signals to produce a contextually proper level of cAMP remains unclear. We hypothesized that Cyr1 itself possesses multiple sensors for different signals and achieves signal integration through a combined allosteric effect on the catalytic center. To test this hypothesis, we affinity-purified a Cyr1-containing complex and found that it could enhance cAMP synthesis upon treatment with serum, peptidoglycan or CO2 in vitro. The data indicate that the complex is an essentially intact sensor/effector apparatus for cAMP synthesis. The complex contains two more subunits, the cyclase-associated protein Cap1 and G-actin. We discovered that G-actin plays a regulatory role, rendering cAMP synthesis responsive to actin dynamics. These findings shed new lights on the mechanisms that regulate cAMP-mediated responses in fungi.

  19. The social and cultural life of the prisoners in the Jewish forced labor camp at Skarzysko-Kamienna.

    Science.gov (United States)

    Karay, F

    1994-01-01

    The article discusses the social and cultural life among the Jewish prisoners at the Skarzysko-Kamienna forced labor camp in central Poland. The activities included organized observances of religious and national customs and creative arts and performances of many kinds. The activities served several functions for the artists and audiences. Whether as a source of income in the struggle for physical survival, or as a psychological escape from the terrible reality of daily life in the camp, or as a unifying element for the fragmented prisoner population, or as a from of political resistance, these social and cultural activities in the camp constitute a singular phenomenon in the history of the Holocaust.

  20. CREB activity in the nucleus accumbens shell controls gating of behavioral responses to emotional stimuli

    NARCIS (Netherlands)

    Barrot, Michel; Olivier, Jocelien D A; Perrotti, Linda I; DiLeone, Ralph J; Berton, Olivier; Eisch, Amelia J; Impey, Soren; Storm, Daniel R; Neve, Rachael L; Yin, Jerry C; Zachariou, Venetia; Nestler, Eric J

    2002-01-01

    The transcription factor cAMP response element (CRE)-binding protein (CREB) has been shown to regulate neural plasticity. Drugs of abuse activate CREB in the nucleus accumbens, an important part of the brain's reward pathways, and local manipulations of CREB activity have been shown to affect cocain

  1. Design and Development Issues for Educational Robotics Training Camps

    Science.gov (United States)

    Ucgul, Memet; Cagiltay, Kursat

    2014-01-01

    The aim of this study is to explore critical design issues for educational robotics training camps and to describe how these factors should be implemented in the development of such camps. For this purpose, two robotics training camps were organized for elementary school students. The first camp had 30 children attendees, and the second had 22. As…

  2. Induction of nuclear protein factors specific for hormone-responsive region during activation of thyroglobulin gene by thyrotropin in rat thyroid FRTL-5 cells.

    Science.gov (United States)

    Lee, N T; Nayfeh, S N; Chae, C B

    1989-05-05

    We have investigated the mechanism of stimulation of thyroglobulin gene expression by thyrotropin (TSH) and cAMP in rat thyroid FRTL-5 cells. In contrast to the c-fos gene, induction of the thyroglobulin gene by TSH or cAMP is slow (10 h) and sensitive to cycloheximide treatment. We have identified a TSH and cAMP-responsive region of thyroglobulin gene between - 171 and - 140 base pairs from the transcription initiation site. The hormone-responsive region contains DNA sequence elements similar to the consensus cAMP-responsive element as well as the transcription factor AP-1-binding site but with opposite sequence polarity. Three DNA-protein complexes are formed when the hormone-responsive region is incubated with nuclear extracts of FRTL-5 cells. Formation of these complexes is dependent on TSH or cAMP stimulation, thus suggesting that the factors involved in binding to the hormone-responsive region may be induced by TSH. Although the identity of these factors is not yet known, they do not appear to be related to either cAMP-responsive element-binding protein or AP-1. These results suggest that thyroglobulin gene expression in FRTL-5 cells may be mediated by nuclear factors that are induced by cAMP in contrast to other genes (e.g. c-fos) whose activation involves post-translational modification of the pre-existing proteins specific for cAMP-responsive element.

  3. A Space-Time Finite Element Model for Design and Control Optimization of Nonlinear Dynamic Response

    Directory of Open Access Journals (Sweden)

    P.P. Moita

    2008-01-01

    Full Text Available A design and control sensitivity analysis and multicriteria optimization formulation is derived for flexible mechanical systems. This formulation is implemented in an optimum design code and it is applied to the nonlinear dynamic response. By extending the spatial domain to the space-time domain and treating the design variables as control variables that do not change with time, the design space is included in the control space. Thus, one can unify in one single formulation the problems of optimum design and optimal control. Structural dimensions as well as lumped damping and stiffness parameters plus control driven forces, are considered as decision variables. The dynamic response and its sensitivity with respect to the design and control variables are discretized via space-time finite elements, and are integrated at-once, as it is traditionally used for static response. The adjoint system approach is used to determine the design sensitivities. Design optimization numerical examples are performed. Nonlinear programming and optimality criteria may be used for the optimization process. A normalized weighted bound formulation is used to handle multicriteria problems.

  4. Baccalaureate nursing student experiences at a camp for children with diabetes: the impact of a service-learning model.

    Science.gov (United States)

    Vogt, Marjorie A; Chavez, Ruth; Schaffner, Barbara

    2011-01-01

    Camp nurses deliver health care in a non-traditional setting. Research indicates that camp has a positive impact on campers with diabetes mellitus, but the impact on student nurse knowledge of diabetes care and confidence in the role as a member of the health care team is unknown. This study examined the experiences of student nurses at a summer residential camp for children with diabetes using a service-learning framework. Camp positively increased knowledge of diabetes in the nursing students. Reflective journals identified themes of anxiety, fatigue, responsibility, and increased confidence in the nursing student, while developing empathy for the lifestyle of children with diabetes. Future research on camp nursing is indicated.

  5. 2012 USGS Lidar: Brooks Camp (AK)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The U.S. Geological Survey (USGS) had a requirement for high resolution Lidar needed for mapping the Brooks Camp region of Katmai National Park in Alaska....

  6. Identification and Validation of a Putative Polycomb Responsive Element in the Human Genome.

    Directory of Open Access Journals (Sweden)

    Hemant Bengani

    Full Text Available Epigenetic cellular memory mechanisms that involve polycomb and trithorax group of proteins are well conserved across metazoans. The cis-acting elements interacting with these proteins, however, are poorly understood in mammals. In a directed search we identified a potential polycomb responsive element with 25 repeats of YY1 binding motifthatwe designate PRE-PIK3C2B as it occurs in the first intron of human PIK3C2B gene. It down regulates reporter gene expression in HEK cells and the repression is dependent on polycomb group of proteins (PcG. We demonstrate that PRE-PIK3C2B interacts directly with YY1 in vitro and recruits PRC2 complex in vivo. The localization of PcG proteins including YY1 to PRE-PIK3C2B in HEK cells is decreased on knock-down of either YY1 or SUZ12. Endogenous PRE-PIK3C2B shows bivalent marking having H3K27me3 and H3K4me3 for repressed and active state respectively. In transgenic Drosophila, PRE-PIK3C2B down regulates mini-white expression, exhibits variegation and pairing sensitive silencing (PSS, which has not been previously demonstrated for mammalian PRE. Taken together, our results strongly suggest that PRE-PIK3C2B functions as a site of interaction for polycomb proteins.

  7. HIV Rev Assembly on the Rev Response Element (RRE: A Structural Perspective

    Directory of Open Access Journals (Sweden)

    Jason W. Rausch

    2015-06-01

    Full Text Available HIV-1 Rev is an ~13 kD accessory protein expressed during the early stage of virus replication. After translation, Rev enters the nucleus and binds the Rev response element (RRE, a ~350 nucleotide, highly structured element embedded in the env gene in unspliced and singly spliced viral RNA transcripts. Rev-RNA assemblies subsequently recruit Crm1 and other cellular proteins to form larger complexes that are exported from the nucleus. Once in the cytoplasm, the complexes dissociate and unspliced and singly-spliced viral RNAs are packaged into nascent virions or translated into viral structural proteins and enzymes, respectively. Rev binding to the RRE is a complex process, as multiple copies of the protein assemble on the RNA in a coordinated fashion via a series of Rev-Rev and Rev-RNA interactions. Our understanding of the nature of these interactions has been greatly advanced by recent studies using X-ray crystallography, small angle X-ray scattering (SAXS and single particle electron microscopy as well as biochemical and genetic methodologies. These advances are discussed in detail in this review, along with perspectives on development of antiviral therapies targeting the HIV-1 RRE.

  8. Gold-nanoparticle-based assay for instantaneous detection of nuclear hormone receptor-response elements interactions.

    Science.gov (United States)

    Tan, Yen Nee; Su, Xiaodi; Liu, Edison T; Thomsen, Jane S

    2010-04-01

    Gold nanoparticles (AuNPs) are widely used as colorimetric probes for biosensing, relying on their unique particle size-dependent and/or interparticle distance-dependent extinction spectrum and solution color. Herein, we describe an AuNP-based colorimetric assay to detect binding interactions between nuclear hormone receptors and their corresponding DNA-binding elements, particularly the human estrogen receptors (ERalpha and ERbeta) and their cognate estrogen response elements (EREs). We found that the protein-DNA (ER-ERE) complexes can stabilize citrate anion-capped AuNPs against salt-induced aggregation to a larger extent than the protein (ER) or the DNA (ERE) alone, due to their unique molecular size and charge properties that provide a strong electrosteric protection. Moreover, our results show that the extent of stabilization is sequence-dependent and can distinguish a single base variation in the ERE associated with minor changes in protein-DNA binding affinity. With this assay, many important parameters of protein-DNA binding events (e.g., sequence selectivity, distinct DNA binding properties of protein subtypes, binding stoichiometry, and sequence-independent transient binding) can be determined instantly without using labels, tedious sample preparations, and sophisticated instrumentation. These benefits, in particular the high-throughput potential, could enable this assay to become the assay of choice to complement conventional techniques for large scale characterization of protein-DNA interactions, a key aspect in biological research.

  9. Application of finite element, global polynomial, and kriging response surfaces in Progressive Lattice Sampling designs

    Energy Technology Data Exchange (ETDEWEB)

    ROMERO,VICENTE J.; SWILER,LAURA PAINTON; GIUNTA,ANTHONY A.

    2000-04-25

    This paper examines the modeling accuracy of finite element interpolation, kriging, and polynomial regression used in conjunction with the Progressive Lattice Sampling (PLS) incremental design-of-experiments approach. PLS is a paradigm for sampling a deterministic hypercubic parameter space by placing and incrementally adding samples in a manner intended to maximally reduce lack of knowledge in the parameter space. When combined with suitable interpolation methods, PLS is a formulation for progressive construction of response surface approximations (RSA) in which the RSA are efficiently upgradable, and upon upgrading, offer convergence information essential in estimating error introduced by the use of RSA in the problem. The three interpolation methods tried here are examined for performance in replicating an analytic test function as measured by several different indicators. The process described here provides a framework for future studies using other interpolation schemes, test functions, and measures of approximation quality.

  10. A novel human polycomb binding site acts as a functional polycomb response element in Drosophila.

    Directory of Open Access Journals (Sweden)

    Suresh Cuddapah

    Full Text Available Polycomb group (PcG proteins are key chromatin regulators implicated in multiple processes including embryonic development, tissue homeostasis, genomic imprinting, X-chromosome inactivation, and germ cell differentiation. The PcG proteins recognize target genomic loci through cis DNA sequences known as Polycomb Response Elements (PREs, which are well characterized in Drosophila. However, mammalian PREs have been elusive until two groups reported putative mammalian PREs recently. Consistent with the existence of mammalian PREs, here we report the identification and characterization of a potential PRE from human T cells. The putative human PRE has enriched binding of PcG proteins, and such binding is dependent on a key PcG component SUZ12. We demonstrate that the putative human PRE carries both genetic and molecular features of Drosophila PRE in transgenic flies, implying that not only the trans PcG proteins but also certain features of the cis PREs are conserved between mammals and Drosophila.

  11. Preserved cardiac function despite marked impairment of cAMP generation.

    Directory of Open Access Journals (Sweden)

    Mei Hua Gao

    Full Text Available OBJECTIVES: So many clinical trials of positive inotropes have failed, that it is now axiomatic that agents that increase cAMP are deleterious to the failing heart. An alternative strategy is to alter myocardial Ca(2+ handling or myofilament response to Ca(2+ using agents that do not affect cAMP. Although left ventricular (LV function is tightly linked to adenylyl cyclase (AC activity, the beneficial effects of AC may be independent of cAMP and instead stem from effects on Ca(2+ handling. Here we ask whether an AC mutant molecule that reduces LV cAMP production would have favorable effects on LV function through its effects on Ca(2+ handling alone. METHODS AND RESULTS: We generated transgenic mice with cardiac-directed expression of an AC6 mutant (AC6mut. Cardiac myocytes showed impaired cAMP production in response to isoproterenol (74% reduction; p<0.001, but LV size and function were normal. Isolated hearts showed preserved LV function in response to isoproterenol stimulation. AC6mut expression was associated with increased sarcoplasmic reticulum Ca(2+ uptake and the EC50 for SERCA2a activation was reduced. Cardiac myocytes isolated from AC6mut mice showed increased amplitude of Ca(2+ transients in response to isoproterenol (p = 0.0001. AC6mut expression also was associated with increased expression of LV S100A1 (p = 0.03 and reduced expression of phospholamban protein (p = 0.01. CONCLUSION: LV AC mutant expression is associated with normal cardiac function despite impaired cAMP generation. The mechanism appears to be through effects on Ca(2+ handling - effects that occur despite diminished cAMP.

  12. Sustainability Logistics Basing Science and Technology Objective. Demonstration #1 - 1000 Person Camp Demo

    Science.gov (United States)

    2016-09-01

    69  Table 16: Energy , Fuel and Water Data for Meal Preparation...camp sustainment/logistics elements (e.g., energy , fuel , water, waste, etc.). It can provide Contingency Base commanders with information that could...assist in making informed decisions about the management of energy , fuel , water, and waste.  Hybrid Power Trailer (HPT) – electrical power generation

  13. ESTCP Live Site Demonstrations Former Camp Beale

    Science.gov (United States)

    2012-03-01

    instrumentation package includes a real-time kinematic global positioning system ( RTK - GPS ) receiver for recording positional data and inertial measurement...RS232C ports. For the survey at Camp Beale, the RTK - GPS base station consisted of a Trimble R8 receiver and Trimble HPB450 external radio. CH2M...the former Camp Beale were selected by the ESTCP Program Office. Survey benchmarks for RTK - GPS base station locations had also been established by

  14. Los campings en España

    Directory of Open Access Journals (Sweden)

    Francisco Feo Parrondo

    2003-01-01

    Full Text Available Los campings son una de las variedades turísticas con más crecimiento en España en las últimas décadas: 52’76% el número de campings y 60’22% el de plazas que ofrecen entre 1980 y 2002. Aunque están presentes en todas las provincias, se ubican mayoritariamente en zonas costeras, superando en muchas localidades a los alojamientos hoteleros.

  15. Responses of plant calmodulin to endocytosis induced by rare earth elements.

    Science.gov (United States)

    Wang, Lihong; Cheng, Mengzhu; Chu, Yunxia; Li, Xiaodong; Chen, David D Y; Huang, Xiaohua; Zhou, Qing

    2016-07-01

    The wide application of rare earth elements (REEs) have led to their diffusion and accumulation in the environment. The activation of endocytosis is the primary response of plant cells to REEs. Calmodulin (CaM), as an important substance in calcium (Ca) signaling systems, regulating almost all of the physiological activities in plants, such as cellular metabolism, cell growth and division. However, the response of CaM to endocytosis activated by REEs remains unknown. By using immunofluorescence labeling and a confocal laser scanning microscope, we found that trivalent lanthanum [La(III)], an REE ion, affected the expression of CaM in endocytosis. Using circular dichroism, X-ray photoelectron spectroscopy and computer simulations, we demonstrated that a low concentration of La(III) could interact with extracellular CaM by electrostatic attraction and was then bound to two Ca-binding sites of CaM, making the molecular structure more compact and orderly, whereas a high concentration of La(III) could be coordinated with cytoplasmic CaM or bound to other Ca-binding sites, making the molecular structure more loose and disorderly. Our results provide a reference for revealing the action mechanisms of REEs in plant cells.

  16. Characterizing response to elemental unit of acoustic imaging noise: an FMRI study.

    Science.gov (United States)

    Tamer, Gregory G; Luh, Wen-Ming; Talavage, Thomas M

    2009-07-01

    Acoustic imaging noise produced during functional magnetic resonance imaging (fMRI) studies can hinder auditory fMRI research analysis by altering the properties of the acquired time-series data. Acoustic imaging noise can be especially confounding when estimating the time course of the hemodynamic response (HDR) in auditory event-related fMRI (fMRI) experiments. This study is motivated by the desire to establish a baseline function that can serve not only as a comparison to other quantities of acoustic imaging noise for determining how detrimental is one's experimental noise, but also as a foundation for a model that compensates for the response to acoustic imaging noise. Therefore, the amplitude and spatial extent of the HDR to the elemental unit of acoustic imaging noise (i.e., a single ping) associated with echoplanar acquisition were characterized and modeled. Results from this fMRI study at 1.5 T indicate that the group-averaged HDR in left and right auditory cortex to acoustic imaging noise (duration of 46 ms) has an estimated peak magnitude of 0.29% (right) to 0.48% (left) signal change from baseline, peaks between 3 and 5 s after stimulus presentation, and returns to baseline and remains within the noise range approximately 8 s after stimulus presentation.

  17. Seismic response of continuous span bridges through fiber-based finite element analysis

    Institute of Scientific and Technical Information of China (English)

    Chiara Casarotti; Rui Pinho

    2006-01-01

    It is widely recognized that nonlinear time-history analysis constitutes the most accurate way to simulate the response of structures subjected to strong levels of seismic excitation. This analytical method is based on sound underlying principles and has the capability to reproduce the intrinsic inelastic dynamic behavior of structures. Nonetheless,comparisons with experimental results from large-scale testing of structures are still needed, in order to ensure adequate levels of confidence in this numerical methodology. The fiber modelling approach employed in the current endeavor inherently accounts for geometric nonlinearities and material inelasticity, without a need for calibration of plastic hinges mechanisms,typical in concentrated plasticity models. The resulting combination of analysis accuracy and modelling simplicity, allows thus to overcome the perhaps not fully justifiable sense of complexity associated to nonlinear dynamic analysis. The fiberbased modelling approach is employed in the framework of a finite element program downloaded from the Internet for seismic response analysis of framed structures. The reliability and accuracy of the program are demonstrated by numerically reproducing pseudo-dynamic tests on a four span continuous deck concrete bridge. Modelling assumptions are discussed,together with their implications on numerical results of the nonlinear time-history analyses, which were found to be in good agreement with experimental results.

  18. Quantifying crustal response to deep active intrusions with geodesy-based finite element modeling

    Science.gov (United States)

    Henderson, S. T.; Pritchard, M. E.; Elliott, J.

    2013-12-01

    The Altiplano-Puna Volcanic Complex (APVC, 21-24 S, 66-69 W) is a first order feature of the Central Andes Volcanic Arc. The APVC consists of over 10,000 km^3 of dacitic ignimbrites deposited in the late Miocene, making it one of the largest concentrations of silicic volcanism in the world. The persistent and intense magmatic flux in this region has likely contributed to the thickened crust (50-70 km), elevated geotherm (>50 C/km) and extensive partial melt (mass balance between source and sink reservoirs, and require physically realistic rheological parameters of the crust. Modeling is performed with Pylith finite element software on a cylindrical three dimensional domain with a radius of 300 km and depth of 200 km. Our models assume pressurization in a viscoelastic crust, and therefore describe crustal response rather than dynamic processes of fluid creation and motion. Surface deformation timescales are highly dependent on geothermal gradient and source pressurization history. While still inconclusive, the potential for an abrupt end to surface deformation has important implications for the characterization of creep versus relaxation processes occurring in response to deep intrusions. Ultimately, crustal scale numerical models provide a means to check petrologically-derived depths of fluid accumulation, in addition to theoretical estimates of softening that occurs with distributed partial melt. The specific models presented are tuned to the subsurface conditions of the APVC, but may be relevant to arc intrusions below the brittle-ductile transition elsewhere.

  19. Finite element modeling of human brain response to football helmet impacts.

    Science.gov (United States)

    Darling, T; Muthuswamy, J; Rajan, S D

    2016-10-01

    The football helmet is used to help mitigate the occurrence of impact-related traumatic (TBI) and minor traumatic brain injuries (mTBI) in the game of American football. While the current helmet design methodology may be adequate for reducing linear acceleration of the head and minimizing TBI, it however has had less effect in minimizing mTBI. The objectives of this study are (a) to develop and validate a coupled finite element (FE) model of a football helmet and the human body, and (b) to assess responses of different regions of the brain to two different impact conditions - frontal oblique and crown impact conditions. The FE helmet model was validated using experimental results of drop tests. Subsequently, the integrated helmet-human body FE model was used to assess the responses of different regions of the brain to impact loads. Strain-rate, strain, and stress measures in the corpus callosum, midbrain, and brain stem were assessed. Results show that maximum strain-rates of 27 and 19 s(-1) are observed in the brain-stem and mid-brain, respectively. This could potentially lead to axonal injuries and neuronal cell death during crown impact conditions. The developed experimental-numerical framework can be used in the study of other helmet-related impact conditions.

  20. cAMP stimulation of StAR expression and cholesterol metabolism is modulated by co-expression of labile suppressors of transcription and mRNA turnover.

    Science.gov (United States)

    Jefcoate, Colin R; Lee, Jinwoo; Cherradi, Nadia; Takemori, Hiroshi; Duan, Haichuan

    2011-04-10

    The steroidogenic acute regulatory (StAR) protein is generated in rodents from 1.6 kb and 3.5 kb mRNA formed by alternative polyadenylation. The zinc finger protein, TIS11B (also Znf36L1), is elevated by cAMP in adrenal cells in parallel with StAR mRNA. TIS11b selectively destabilizes the 3.5 kb mRNA through AU-rich sequences at the end of the 3'UTR. siRNA suppression shows that TIS11b surprisingly increases StAR protein and cholesterol metabolism. StAR transcription is directly activated by PKA phosphorylation. cAMP responsive element binding (CREB) protein 1 phosphorylation is a key step leading to recruitment of the co-activator, CREB binding protein (CBP). A second protein, CREB regulated transcription coactivator (TORC/CRTC), enhances this recruitment, but is inhibited by salt inducible kinase (SIK). Basal StAR transcription is constrained through this phosphorylation of TORC. PKA provides an alternative stimulation by phosphorylating SIK, which prevents TORC inactivation. PKA stimulation of StAR nuclear transcripts substantially precedes TORC recruitment to the StAR promoter, which may, therefore, mediate a later step in mRNA production. Inhibition of SIK by staurosporine elevates StAR transcription and TORC recruitment to maximum levels, but without CREB phosphorylation. TORC suppression by SIK evidently limits basal StAR transcription. Staurosporine and cAMP stimulate synergistically. SIK targets the phosphatase, PP2a (activation), and Type 2 histone de-acetylases (inhibition), which may each contribute to suppression. Staurosporine stimulation through SIK inhibition is repeated in cAMP stimulation of many steroidogenic genes regulated by steroidogenic factor 1 (SF-1) and CREB. TIS11b and SIK may combine to attenuate StAR expression when hormonal stimuli decline.

  1. Identification of the interleukin-6/oncostatin M response element in the rat tissue inhibitor of metalloproteinases-1 (TIMP-1) promoter.

    Science.gov (United States)

    Bugno, M; Graeve, L; Gatsios, P; Koj, A; Heinrich, P C; Travis, J; Kordula, T

    1995-01-01

    The rat tissue inhibitor of metalloproteinase 1 (TIMP-1) gene is expressed in rat hepatocytes, and this expression is up-regulated by interleukin 6 (IL-6). We report here the cloning of the 5' flanking region of the rat TIMP-1 gene and identification of an IL-6/oncostatin M (OSM) response element at -64 to -36 which functions in hepatic cells. Within this element we have identified two functional binding sites for transcription factors AP-1 (activatory protein-1) and STAT (signal transducer and activator of transcription). IL-6/OSM stimulation induces binding of a protein, identified as STAT3, to the IL-6/OSM response element, while binding of the AP-1 protein was constitutive. Binding sites for both AP-1 and STAT3 are necessary for full responsiveness of the TIMP-1 promoter to IL-6/OSM, as shown by deletion and mutation analysis. Furthermore, the entire IL-6/OSM response element conferred responsiveness onto a heterologous promoter, whereas this has not been observed when AP-1 and STAT elements were separately tested. Images PMID:8559663

  2. Camp Sherman, Ohio: History of a World War I Training Camp

    Science.gov (United States)

    2015-12-01

    v Preface...85 Report Documentation Page ERDC/CERL TR-15-25 v Figures... Combed and Brushed on Camp Sherman Parade Ground for Photograph,” The Camp Sherman News, 5 November 1918, 5. ERDC/CERL TR-15-25 38 Figure 32

  3. Camping in the Disciplines: Assessing the Effect of Writing Camps on Graduate Student Writers

    Science.gov (United States)

    Busl, Gretchen; Donnelly, Kara Lee; Capdevielle, Matthew

    2015-01-01

    In the past ten years, an increasing number of universities have begun organizing writing "camps," or full-week immersion experiences, in an effort to address the increased need to support graduate student writing. Outside of anecdotes and testimonials, we have previously had very little data about these camps' success. This study,…

  4. Liver X receptor regulates hepatic nuclear O-GlcNAc signaling and carbohydrate responsive element-binding protein activity

    DEFF Research Database (Denmark)

    Bindesbøll, Christian; Fan, Qiong; Nørgaard, Rikke C;

    2015-01-01

    Liver X receptor (LXR)α and LXRβ play key roles in hepatic de novo lipogenesis through their regulation of lipogenic genes, including sterol regulatory element-binding protein (SREBP)-1c and carbohydrate responsive element-binding protein (ChREBP). LXRs activate lipogenic gene transcription...... metabolic sensors upstream of ChREBP by modulating GK expression, nuclear O-GlcNAc signaling, and ChREBP expression and activity....

  5. Effects of segregation of primary alloying elements on the creep response in magnesium alloys

    DEFF Research Database (Denmark)

    Huang, Y.D.; Dieringa, H.; Hort, N.

    2008-01-01

    The segregation of primary alloying elements deteriorates the high temperature creep resistance of magnesium alloys. Annealing at high temperatures alleviating their segregations can improve the creep resistance. Present investigation on the effect of segregation of primary alloying elements...

  6. TLR-2 Recognizes Propionibacterium acnes CAMP Factor 1 from Highly Inflammatory Strains

    Science.gov (United States)

    Ollagnier, Guillaume; Désiré, Nathalie; Sayon, Sophie; Raingeaud, Jöel; Marcelin, Anne-Geneviève; Calvez, Vincent; Khammari, Amir; Batteux, Frédéric; Dréno, Brigitte; Dupin, Nicolas

    2016-01-01

    Background Propionibacterium acnes (P. acnes) is an anaerobic, Gram-positive bacteria encountered in inflammatory acne lesions, particularly in the pilosebaceous follicle. P. acnes triggers a strong immune response involving keratinocytes, sebocytes and monocytes, the target cells during acne development. Lipoteicoic acid and peptidoglycan induce the inflammatory reaction, but no P. acnes surface protein interacting with Toll-like receptors has been identified. P. acnes surface proteins have been extracted by lithium stripping and shown to induce CXCL8 production by keratinocytes. Methodology and principal findings Far-western blotting identified two surface proteins, of 24.5- and 27.5-kDa in size, specifically recognized by TLR2. These proteins were characterized, by LC-MS/MS, as CAMP factor 1 devoid of its signal peptide sequence, as shown by N-terminal sequencing. Purified CAMP factor 1 induces CXCL8 production by activating the CXCL8 gene promoter, triggering the synthesis of CXCL8 mRNA. Antibodies against TLR2 significantly decreased the CXCL8 response. For the 27 P. acnes strains used in this study, CAMP1-TLR2 binding intensity was modulated and appeared to be strong in type IB and II strains, which produced large amounts of CXCL8, whereas most of the type IA1 and IA2 strains presented little or no CAMP1-TLR2 binding and low levels of CXCL8 production. The nucleotide sequence of CAMP factor displays a major polymorphism, defining two distinct genetic groups corresponding to CAMP factor 1 with 14 amino-acid changes from strains phylotyped II with moderate and high levels of CAMP1-TLR2 binding activity, and CAMP factor 1 containing 0, 1 or 2 amino-acid changes from strains phylotyped IA1, IA2, or IB presenting no, weak or moderate CAMP1-TLR2 binding. Conclusions Our findings indicate that CAMP factor 1 may contribute to P. acnes virulence, by amplifying the inflammation reaction through direct interaction with TLR2. PMID:27902761

  7. Sesamin induces melanogenesis by microphthalmia-associated transcription factor and tyrosinase up-regulation via cAMP signaling pathway

    Institute of Scientific and Technical Information of China (English)

    Zequn Jiang; Shasha Li; Yunyi Liu; Pengyi Deng; Jianguo Huang; Guangyuan He

    2011-01-01

    In this study,we confirmed that sesamin,an active lignan isolated from sesame seed and oil,is a novel skin-tanning compound.The melanin content and tyrosinase activity were increased by sesamin in a dose-dependent manner in B16 melanoma cells.The mRNA and protein levels of tyrosinase were also enhanced after the treatment with sesamin.Western blot analysis revealed that sesamin induced and sustained up-regulation of microphthalmiaassociated transcription factor (MITF).Sesamin could activate cAMP response element (CRE) binding protein (CREB),but it had no effect on the phosphorylation of p38 mitogen-activated protein kinase (MAPK) or Akt.Moreover,sesamin activated protein kinase A (PKA) via a cAMP-dependent pathway.Consistent with these results,sesamin-mediated increase of melanin synthesis was reduced significantly by H-89,a PKA inhibitor,but not by SB203580,a p38 MAPK inhibitor or by LY294002,a phosphatidylinositol-3-kinase (PI3K) inhibitor.Sesamin-mediated phosphorylation of CREB and induction of MITF and tyrosinase expression were also inhibited by H-89.These findings indicated that sesamin could stimulate melanogenesis in B16 cells via the up-regulation of MITF and tyrosinase,which was,in turn,due to the activation of cAMP signaling.

  8. Sesamin induces melanogenesis by microphthalmia-associated transcription factor and tyrosinase up-regulation via cAMP signaling pathway.

    Science.gov (United States)

    Jiang, Zequn; Li, Shasha; Liu, Yunyi; Deng, Pengyi; Huang, Jianguo; He, Guangyuan

    2011-10-01

    In this study, we confirmed that sesamin, an active lignan isolated from sesame seed and oil, is a novel skin-tanning compound. The melanin content and tyrosinase activity were increased by sesamin in a dose-dependent manner in B16 melanoma cells. The mRNA and protein levels of tyrosinase were also enhanced after the treatment with sesamin. Western blot analysis revealed that sesamin induced and sustained up-regulation of microphthalmia-associated transcription factor (MITF). Sesamin could activate cAMP response element (CRE) binding protein (CREB), but it had no effect on the phosphorylation of p38 mitogen-activated protein kinase (MAPK) or Akt. Moreover, sesamin activated protein kinase A (PKA) via a cAMP-dependent pathway. Consistent with these results, sesamin-mediated increase of melanin synthesis was reduced significantly by H-89, a PKA inhibitor, but not by SB203580, a p38 MAPK inhibitor or by LY294002, a phosphatidylinositol-3-kinase (PI3K) inhibitor. Sesamin-mediated phosphorylation of CREB and induction of MITF and tyrosinase expression were also inhibited by H-89. These findings indicated that sesamin could stimulate melanogenesis in B16 cells via the up-regulation of MITF and tyrosinase, which was, in turn, due to the activation of cAMP signaling.

  9. A chromatin insulator driving three-dimensional Polycomb response element (PRE) contacts and Polycomb association with the chromatin fiber

    DEFF Research Database (Denmark)

    Comet, Itys; Schuettengruber, Bernd; Sexton, Tom;

    2011-01-01

    to insulate genes from regulatory elements or to take part in long-distance interactions. Using a high-resolution chromatin conformation capture (H3C) method, we show that the Drosophila gypsy insulator behaves as a conformational chromatin border that is able to prohibit contacts between a Polycomb response...... element (PRE) and a distal promoter. On the other hand, two spaced gypsy elements form a chromatin loop that is able to bring an upstream PRE in contact with a downstream gene to mediate its repression. Chromatin immunoprecipitation (ChIP) profiles of the Polycomb protein and its associated H3K27me3...

  10. cAMP target sequences enhCRE and CNRE sense low-salt intake to increase human renin gene expression in vivo.

    Science.gov (United States)

    Desch, Michael; Harlander, Sabine; Neubauer, Björn; Gerl, Melanie; Germain, Stephane; Castrop, Hayo; Todorov, Vladimir T

    2011-05-01

    This study aimed to assess the role of cAMP target sequences enhancer cAMP response element (enhCRE) and cAMP and overlapping negative response element (CNRE) in the control of human renin gene (REN) in vivo. enhCRE and CNRE were silenced by mutations in a 12.2-kb human renin promoter fused to LacZ reporter gene. This construct was used to generate transgenic mice (RENMut-LacZ). The expression of the transgene was correctly targeted to the juxtaglomerular portions of renal afferent arterioles which express endogenous mouse renin. Therefore, enhCRE and CNRE do not seem to be relevant for the control of the cell-specific expression of the human renin gene. The β-adrenoreceptor agonist isoproterenol (10 mg/kg/day, for 2 days) stimulated the endogenous renin, but not the LacZ mRNA expression. Treatment of RENMut-LacZ mice with the angiotensin converting enzyme inhibitor (enalapril 10 mg/kg/day, for 7 days) or their crossing to angiotensin receptor type 1a knockout mice led to increased renin and LacZ mRNA levels. Renin expression was upregulated by low-salt diet (0.03% NaCl, for 10 days) and downregulated by high-salt diet (4% NaCl, for 10 days). In contrast, low-salt diet did not influence, while high-salt diet inhibited the expression of LacZ. In summary, enhCRE and CNRE appear to be necessary for the transactivation of the human renin gene through β-adrenoreceptors and by low-salt diet. Our data also suggest that different intracellular mechanisms mediate the effect of low- and high-salt intake on renin expression in vivo.

  11. Base Camp Life Cycle Management: Focusing on the Critical Elements

    Science.gov (United States)

    2011-12-01

    Gharajedaghi, Systems Thinking: Managing Chaos and Complexity: a Platform For Designing Business Architecture , 2nd ed. (Boston, MA.: Butterworth-Heinemann...2006), xvii. 5 Mary Jo Hatch with Ann L. Cunliffe, Organization Theory: Modern, Symbolic, and Postmodern Perspectives, 2nd ed. (New York: Oxford...American Planning, Frederick R. Steiner, and Kent Butler. Planning and Urban Design Standards (Ramsey/Sleeper Architectural Graphic Standards Series

  12. Icariin upregulates phosphorylated cyclic adenosine monophosphate response element binding protein levels in the hippocampus of the senescence- accelerated mouse

    Institute of Scientific and Technical Information of China (English)

    Zhanwei Zhang; Ting Zhang; Keli Dong

    2012-01-01

    At 8 weeks after intragastric administration of icariin to senescence-accelerated mice (P8 strain), Morris water maze results showed that escape latency was shortened, and the number of platform crossings was increased. Immunohistochemical staining and western blot assay detected signifi-cantly increased levels of cyclic adenosine monophosphate response element binding protein. These results suggest that icariin upregulates phosphorylated cyclic adenosine monophosphate response element binding protein levels and improves learning and memory functions in hippo-campus of the senescence-accelerated mouse.

  13. Isoniazid suppresses antioxidant response element activities and impairs adipogenesis in mouse and human preadipocytes

    Energy Technology Data Exchange (ETDEWEB)

    Chen, Yanyan [Institute for Chemical Safety Sciences, The Hamner Institutes for Health Sciences, 6 Davis Drive, Research Triangle Park, NC 27709 (United States); The First Affiliated Hospital, China Medical University, Shenyang 110001 (China); Xue, Peng [Institute for Chemical Safety Sciences, The Hamner Institutes for Health Sciences, 6 Davis Drive, Research Triangle Park, NC 27709 (United States); Key Laboratory of the Public Health Safety, Ministry of Education, School of Public Health, Fudan University, Shanghai (China); Hou, Yongyong [Institute for Chemical Safety Sciences, The Hamner Institutes for Health Sciences, 6 Davis Drive, Research Triangle Park, NC 27709 (United States); School of Public Health, China Medical University, Shenyang 110001 (China); Zhang, Hao [Key Laboratory of the Public Health Safety, Ministry of Education, School of Public Health, Fudan University, Shanghai (China); Zheng, Hongzhi [Institute for Chemical Safety Sciences, The Hamner Institutes for Health Sciences, 6 Davis Drive, Research Triangle Park, NC 27709 (United States); The First Affiliated Hospital, China Medical University, Shenyang 110001 (China); Zhou, Tong [Institute for Chemical Safety Sciences, The Hamner Institutes for Health Sciences, 6 Davis Drive, Research Triangle Park, NC 27709 (United States); Qu, Weidong [Key Laboratory of the Public Health Safety, Ministry of Education, School of Public Health, Fudan University, Shanghai (China); Teng, Weiping [The First Affiliated Hospital, China Medical University, Shenyang 110001 (China); Zhang, Qiang; Andersen, Melvin E. [Institute for Chemical Safety Sciences, The Hamner Institutes for Health Sciences, 6 Davis Drive, Research Triangle Park, NC 27709 (United States); Pi, Jingbo, E-mail: jingbopi@gmail.com [Institute for Chemical Safety Sciences, The Hamner Institutes for Health Sciences, 6 Davis Drive, Research Triangle Park, NC 27709 (United States); School of Public Health, China Medical University, Shenyang 110001 (China)

    2013-12-15

    Transcriptional signaling through the antioxidant response element (ARE), orchestrated by the Nuclear factor E2-related factor 2 (Nrf2), is a major cellular defense mechanism against oxidative or electrophilic stress. Here, we reported that isoniazid (INH), a widely used antitubercular drug, displays a substantial inhibitory property against ARE activities in diverse mouse and human cells. In 3T3-L1 preadipocytes, INH concentration-dependently suppressed the ARE-luciferase reporter activity and mRNA expression of various ARE-dependent antioxidant genes under basal and oxidative stressed conditions. In keeping with our previous findings that Nrf2-ARE plays a critical role in adipogenesis by regulating expression of CCAAT/enhancer-binding protein β (C/EBPβ) and peroxisome proliferator-activated receptor γ (PPARγ), suppression of ARE signaling by INH hampered adipogenic differentiation of 3T3-L1 cells and human adipose-derived stem cells (ADSCs). Following adipogenesis induced by hormonal cocktails, INH-treated 3T3-L1 cells and ADSCs displayed significantly reduced levels of lipid accumulation and attenuated expression of C/EBPα and PPARγ. Time-course studies in 3T3-L1 cells revealed that inhibition of adipogenesis by INH occurred in the early stage of terminal adipogenic differentiation, where reduced expression of C/EBPβ and C/EBPδ was observed. To our knowledge, the present study is the first to demonstrate that INH suppresses ARE signaling and interrupts with the transcriptional network of adipogenesis, leading to impaired adipogenic differentiation. The inhibition of ARE signaling may be a potential underlying mechanism by which INH attenuates cellular antioxidant response contributing to various complications. - Highlights: • Isoniazid suppresses ARE-mediated transcriptional activity. • Isoniazid inhibits adipogenesis in preadipocytes. • Isoniazid suppresses adipogenic gene expression during adipogenesis.

  14. A peroxisome proliferator response elements regulatory system in xenopus oocytes and its application

    Institute of Scientific and Technical Information of China (English)

    YAN Jin; FAN Chun-lei; WO Xing-de; GAO Li-ping

    2005-01-01

    Background Peroxisome proliferator-activated receptor-gamma (PPARγ) is a kind of ligand-activated transcription factors binding to peroxisome proliferator response element (PPRE), a specific recognition site. It is thought to play a critical role in glucose and lipid metabolism and in inflammation control. The aim of this study was to establish a new cellular model for the quick screening of lipid-lowering drugs, which may be effective as PPAR-γ ligands on the PPRE-mediated pathway regulatory system. Methods Two plasmids were constructed: pXOE-PPARγ, in which the human PPARγ gene was in the downstream of TFⅢA gene promoter, and pLXRN-PPRE-d2EGFP, in which the enhanced green fluorescent protein (EGFP) gene was subcloned into PPRE. The xenopus oocytes were injected with these two plamids, and consequently treated with prostaglandin E1, pioglitazone, and different kinds of lipid-lowering drugs. After 3 days, the oocytes were observed under a fluorescence microscope. To confirm the drug action,we injected pXOE-PPARγ plasmid into the oocytes, which then treated with prostaglandin E1and Hawthorn flavonoids. The mass of expressed lipoprotein lipase (LPL) in the cells was determined by enzyme labeling linked immunosorbent assay (ELISA).Conclusions It is possible to establish a PPRE regulatory EGFP reporter system in xenopus oocytes to monitor the activity of PPARγ ligand. Hawthorn flavonoids can increase the expression of gene downsteam of PPRE by effect on the PPRE pathway regulatory system.

  15. Farnesoid X Receptor Inhibits the Transcriptional Activity of Carbohydrate Response Element Binding Protein in Human Hepatocytes

    Science.gov (United States)

    Caron, Sandrine; Huaman Samanez, Carolina; Dehondt, Hélène; Ploton, Maheul; Briand, Olivier; Lien, Fleur; Dorchies, Emilie; Dumont, Julie; Postic, Catherine; Cariou, Bertrand; Lefebvre, Philippe

    2013-01-01

    The glucose-activated transcription factor carbohydrate response element binding protein (ChREBP) induces the expression of hepatic glycolytic and lipogenic genes. The farnesoid X receptor (FXR) is a nuclear bile acid receptor controlling bile acid, lipid, and glucose homeostasis. FXR negatively regulates hepatic glycolysis and lipogenesis in mouse liver. The aim of this study was to determine whether FXR regulates the transcriptional activity of ChREBP in human hepatocytes and to unravel the underlying molecular mechanisms. Agonist-activated FXR inhibits glucose-induced transcription of several glycolytic genes, including the liver-type pyruvate kinase gene (L-PK), in the immortalized human hepatocyte (IHH) and HepaRG cell lines. This inhibition requires the L4L3 region of the L-PK promoter, known to bind the transcription factors ChREBP and hepatocyte nuclear factor 4α (HNF4α). FXR interacts directly with ChREBP and HNF4α proteins. Analysis of the protein complex bound to the L4L3 region reveals the presence of ChREBP, HNF4α, FXR, and the transcriptional coactivators p300 and CBP at high glucose concentrations. FXR activation does not affect either FXR or HNF4α binding to the L4L3 region but does result in the concomitant release of ChREBP, p300, and CBP and in the recruitment of the transcriptional corepressor SMRT. Thus, FXR transrepresses the expression of genes involved in glycolysis in human hepatocytes. PMID:23530060

  16. LAS0811: From Combinatorial Chemistry to Activation of Antioxidant Response Element

    Directory of Open Access Journals (Sweden)

    Ming Zhu

    2009-01-01

    Full Text Available The antioxidant response element (ARE and its transcription factor, nuclear factor-erythroid 2 p45-related factor 2 (Nrf2, are potential targets for cancer chemoprevention. We sought to screen small molecules synthesized with combinatorial chemistry for activation of ARE. By high-throughput screening of 9400 small molecules from 10 combinatorial chemical libraries using HepG2 cells with an ARE-driven reporter, we have identified a novel small molecule, 1,2-dimethoxy-4,5-dinitrobenzene (LAS0811, as an activator of the ARE. LAS0811 upregulated the activity of NAD(PH:quinone oxidoreductase 1 (NQO1, a representative antioxidative enzyme regulated by ARE. It enhanced production of an endogenous reducing agent, glutathione (GSH. In addition, LAS0811 induced expression of heme oxygenase 1 (HO1, which is an ARE-regulated enzyme with anti-inflammatory activity. Furthermore, LAS0811 reduced cell death due to the cytotoxic stress of a strong oxidant, t-butyl hydroperoxide (t-BOOH. Mechanistically, LAS0811 upregulated the expression of Nrf2 and promoted its translocation into the nuclei leading to subsequent ARE activation. Taken together, LAS0811 is a novel activator of the ARE and its associated detoxifying genes and, thus, a potential agent for cancer chemoprevention.

  17. Killing of Brain Tumor Cells by Hypoxia-Responsive Element Mediated Expression of BAX

    Directory of Open Access Journals (Sweden)

    Hangjun Ruan

    1999-11-01

    Full Text Available The presence of radioresistant hypoxic cells in human brain tumors limits the overall effectiveness of conventional fractionated radiation therapy. Tumor-specific therapies that target hypoxic cells are clearly needed. We have investigated the expression of suicide genes under hypoxia by a hypoxia-responsive element (HRE, which can be activated through hypoxia-inducible factor-1 (HIF-1. We transfected plasmids containing multiple copies of HIRE into U-87 MG and U-251 MG-NCI human brain tumor cells and tested their ability to induce LacZ gene expression under anoxia. Gene expression under anoxia versus oxia was increased about 12-fold for U-87 MG cells and about fourfold for U-251 MG-NCI cells. At intermediate hypoxic conditions, increased LacZ gene expression in U-87 MG cells was induced by the plasmid that contained three HREs, but not by the plasmid with two HREs. Lastly, when we placed a suicide gene BAX under the control of HREs, cells transfected with the BAX plasmids were preferentially killed through apoptosis under anoxia. Our studies demonstrate that HRE-regulated gene expression is active in brain tumor cells, and that the amount of increased gene expression obtained is dependent on the cell line, the HIRE copy number, and the degree of hypoxia.

  18. [Response of a finite element model of the pelvis to different side impact loads].

    Science.gov (United States)

    Ruan, Shijie; Zheng, Huijing; Li, Haiyan; Zhao, Wei

    2013-08-01

    The pelvis is one of the most likely affected areas of the human body in case of side impact, especially while people suffer from motor vehicle crashes. With the investigation of pelvis injury on side impact, the injury biomechanical behavior of pelvis can be found, and the data can help design the vehicle security devices to keep the safety of the occupants. In this study, a finite element (FE) model of an isolated human pelvis was used to study the pelvic dynamic response under different side impact conditions. Fracture threshold was established by applying lateral loads of 1000, 2000, 3000, 4000 and 5000 N, respectively, to the articular surface of the right acetabulum. It was observed that the smaller the lateral loads were, the smaller the von Mises stress and the displacement in the direction of impact were. It was also found that the failure threshold load was near 3000 N, based on the fact that the peak stress would not exceed the average compressive strength of the cortical bone. It could well be concluded that with better design of car-door and hip-pad so that the side impact force was brought down to 3000 N or lower, the pelvis would not be injured.

  19. The Role of Carbohydrate Response Element Binding Protein in Intestinal and Hepatic Fructose Metabolism

    Directory of Open Access Journals (Sweden)

    Katsumi Iizuka

    2017-02-01

    Full Text Available Many articles have discussed the relationship between fructose consumption and the incidence of obesity and related diseases. Fructose is absorbed in the intestine and metabolized in the liver to glucose, lactate, glycogen, and, to a lesser extent, lipids. Unabsorbed fructose causes bacterial fermentation, resulting in irritable bowl syndrome. Therefore, understanding the mechanisms underlying intestinal and hepatic fructose metabolism is important for the treatment of metabolic syndrome and fructose malabsorption. Carbohydrate response element binding protein (ChREBP is a glucose-activated transcription factor that controls approximately 50% of de novo lipogenesis in the liver. ChREBP target genes are involved in glycolysis (Glut2, liver pyruvate kinase, fructolysis (Glut5, ketohexokinase, and lipogenesis (acetyl CoA carboxylase, fatty acid synthase. ChREBP gene deletion protects against high sucrose diet-induced and leptin-deficient obesity, because Chrebp−/− mice cannot consume fructose or sucrose. Moreover, ChREBP contributes to some of the physiological effects of fructose on sweet taste preference and glucose production through regulation of ChREBP target genes, such as fibroblast growth factor-21 and glucose-6-phosphatase catalytic subunits. Thus, ChREBP might play roles in fructose metabolism. Restriction of excess fructose intake will be beneficial for preventing not only metabolic syndrome but also irritable bowl syndrome.

  20. Finite element prediction of seismic response modification of monumental structures utilizing base isolation

    Science.gov (United States)

    Spanos, Konstantinos; Anifantis, Nikolaos; Kakavas, Panayiotis

    2015-05-01

    The analysis of the mechanical behavior of ancient structures is an essential engineering task concerning the preservation of architectural heritage. As many monuments of classical antiquity are located in regions of earthquake activity, the safety assessment of these structures, as well as the selection of possible restoration interventions, requires numerical models capable of correctly representing their seismic response. The work presented herein was part of a research project in which a better understanding of the dynamics of classical column-architrave structures was sought by means of numerical techniques. In this paper, the seismic behavior of ancient monumental structures with multi-drum classical columns is investigated. In particular, the column-architrave classical structure under strong ground excitations was represented by a finite element method. This approach simulates the individual rock blocks as distinct rigid blocks interconnected with slidelines and incorporates seismic isolation dampers under the basement of the structure. Sliding and rocking motions of individual stone blocks and drums are modeled utilizing non-linear frictional contact conditions. The seismic isolation is modeled through the application of pad bearings under the basement of the structure. These pads are interpreted by appropriate rubber and steel layers. Time domain analyses were performed, considering the geometric and material non-linear behavior at the joints and the characteristics of pad bearings. The deformation and failure modes of drum columns subject to seismic excitations of various types and intensities were analyzed. The adverse influence of drum imperfections on structural safety was also examined.

  1. Copper toxicity in expanding leaves of Phaseolus vulgaris L.: antioxidant enzyme response and nutrient element uptake.

    Science.gov (United States)

    Bouazizi, Houda; Jouili, Hager; Geitmann, Anja; El Ferjani, Ezzeddine

    2010-09-01

    Bioaccumulation and toxicity of copper (CuSO4) were assessed in expanding leaves of 14-day-old bean seedlings. CuSO4 was administrated in the growth medium for three days and changes in the activities of the antioxidant enzymes guaiacol peroxidase (GPX) and catalase (CAT), and in the H2O2 production and mineral element contents were measured. Copper accumulated in exposed plants caused severe symptoms such as chlorosis and necrosis as well as a dramatic reduction in dry weight production. Simultaneously, concentrations of iron, zinc and potassium were reduced significantly suggesting that a change in nutrient homeostasis may be responsible for the observed symptoms. Contrary to mature tissues, the expanding leaves did not display significant oxidative stress, since malondialdehyde (MDA) content was unchanged, the activities of GPX and CAT were lowered or unaltered, and endogenous H2O2 only increased at high copper concentrations. Our results suggest that while excess copper slightly alters the activity of the antioxidative enzyme system in young expanding leaves of bean plants, it exerts its toxicity primarily through causing a disturbance in the nutrient balance.

  2. Domain- and nucleotide-specific Rev response element regulation of feline immunodeficiency virus production.

    Science.gov (United States)

    Na, Hong; Huisman, Willem; Ellestad, Kristofor K; Phillips, Tom R; Power, Christopher

    2010-09-01

    Computational analysis of feline immunodeficiency virus (FIV) RNA sequences indicated that common FIV strains contain a rev response element (RRE) defined by a long unbranched hairpin with 6 stem-loop sub-domains, termed stem-loop A (SLA). To examine the role of the RNA secondary structure of the RRE, mutational analyses were performed in both an infectious FIV molecular clone and a FIV CAT-RRE reporter system. These studies disclosed that the stems within SLA (SA1, 2, 3, 4, and 5) of the RRE were critical but SA6 was not essential for FIV replication and CAT expression. These studies also revealed that the secondary structure rather than an antisense protein (ASP) mediates virus expression and replication in vitro. In addition, a single synonymous mutation within the FIV-RRE, SA3/45, reduced viral reverse transcriptase activity and p24 expression after transfection but in addition also showed a marked reduction in viral expression and production following infection.

  3. Finite Element Analysis of the Random Response Suppression of Composite Panels at Elevated Temperatures using Shape Memory Alloy Fibers

    Science.gov (United States)

    Turner, Travis L.; Zhong, Z. W.; Mei, Chuh

    1994-01-01

    A feasibility study on the use of shape memory alloys (SMA) for suppression of the random response of composite panels due to acoustic loads at elevated temperatures is presented. The constitutive relations for a composite lamina with embedded SMA fibers are developed. The finite element governing equations and the solution procedures for a composite plate subjected to combined acoustic and thermal loads are presented. Solutions include: 1) Critical buckling temperature; 2) Flat panel random response; 3) Thermal postbuckling deflection; 4) Random response of a thermally buckled panel. The preliminary results demonstrate that the SMA fibers can completely eliminate the thermal postbuckling deflection and significantly reduce the random response at elevated temperatures.

  4. Melanocortin 1 receptor mutations impact differentially on signalling to the cAMP and the ERK mitogen-activated protein kinase pathways.

    Science.gov (United States)

    Herraiz, Cecilia; Jiménez-Cervantes, Celia; Zanna, Paola; García-Borrón, José C

    2009-10-06

    Melanocortin 1 receptor (MC1R), a Gs protein-coupled receptor expressed in melanocytes, is a major determinant of skin pigmentation, phototype and cancer risk. MC1R activates cAMP and mitogen-activated protein kinase ERK1/ERK2 signalling. When expressed in rat pheochromocytoma cell line cells, the R151C, R160W and D294H MC1R variants associated with melanoma and impaired cAMP signalling mediated ERK activation and ERK-dependent, agonist-induced neurite outgrowth comparable with wild-type. Dose-response curves for ERK activation and cAMP production indicated higher sensitivity of the ERK response. Thus, the melanoma-associated MC1R mutations impact differently on cAMP and ERK signalling, suggesting that cAMP is not responsible for functional coupling of MC1R to the ERK cascade.

  5. Signal Transduction in Dictyostelium fgd A Mutants with a Defective Interaction between Surface cAMP Receptors and a GTP-binding Regulatory Protein

    NARCIS (Netherlands)

    Kesbeke, Fanja; Snaar-Jagalska, B. Ewa; Haastert, Peter J.M. van

    1988-01-01

    Transmembrane signal transduction was investigated in four Dictyostelium discoideum mutants that belong to the fgd A complementation group. The results show the following. (a) Cell surface cAMP receptors are present in fgd A mutants, but cAMP does not induce any of the intracellular responses, inclu

  6. A specialized program for children with developmental disabilities within a "typical" overnight summer camp: Camp Ramah's Tikvah Program.

    Science.gov (United States)

    Blas, Howard I

    2007-10-01

    The Tikvah Program is an overnight camping program at Camp Ramah in New England that serves campers with a range of developmental disabilities. The program has evolved over its 37-year history and includes a camping program, vocational training program, and inclusion program. Select graduates are hired by the camp for summer employment. The Tikvah Program offers a model for serving campers with special needs within a larger "typical" summer camp. Although serving the needs of such campers offers unique challenges, the presence of such a program in a regular summer camp offers tremendous opportunities and benefits for campers with special needs and more typically developing campers.

  7. The Indirect Boundary Element Method (IBEM) for Seismic Response of Topographical Irregularities in Layered Media

    Science.gov (United States)

    Contreras Zazueta, M. A.; Perton, M.; Sanchez-Sesma, F. J.; Sánchez-Alvaro, E.

    2013-12-01

    The seismic hazard assessment of extended developments, such as a dam, a bridge or a pipeline, needs the strong ground motion simulation taking into account the effects of surface geology. In many cases the incoming wave field can be obtained from attenuation relations or simulations for layered media using Discrete Wave Number (DWN). Sometimes there is a need to include in simulations the seismic source as well. A number of methods to solve these problems have been developed. Among them the Finite Element and Finite Difference Methods (FEM and FDM) are generally preferred because of the facility of use. Nevertheless, the analysis of realistic dynamic loading induced by earthquakes requires a thinner mesh of the entire domain to consider high frequencies. Consequently this may imply a high computational cost. The Indirect Boundary Element Method (IBEM) can also be employed. Here it is used to study the response of a site to historical seismic activity. This method is particularly suited to model wave propagation through wide areas as it requires only the meshing of boundaries. Moreover, it is well suited to represent finely the diffraction that can occur on a fault. However, the IBEM has been applied mainly to simple geometrical configurations. In this communication significant refinements of the formulation are presented. Using IBEM we can simulate wave propagation in complex geometrical configurations such as a stratified medium crossed by thin faults or having a complex topography. Two main developments are here described; one integrates the DWN method inside the IBEM in order to represent the Green's functions of stratified media with relatively low computational cost but assuming unbounded parallel flat layers, and the other is the extension of IBEM to deal with multi-regions in contact which allows more versatility with a higher computational cost compared to the first one but still minor to an equivalent FEM formulation. The two approaches are fully

  8. A study of the diffusional response of refractory and other elements in superalloy systems during diffusion coating

    Energy Technology Data Exchange (ETDEWEB)

    Purvis, A.L.; Warnes, B.M. [Howmet Thermatech Coatings, Whitehall, MI (United States)

    2000-11-01

    Samples of commercially pure nickel and two common superalloys were prepared by electroplating a thin layer of platinum on the surface, then exposing the samples to temperatures of 950 C and 1080 C for periods of two and six hours. Using electron probe micro analysis (EMPA), elemental composition profiles were obtained from the samples following the diffusion steps. The relative diffusion coefficients for a number of elements were determined using a classical Boltzmann-Matano method. As expected, it was discovered that elements such as cobalt, chromium, titanium and tantalum displayed a significant diffusional response in this relatively short time, while tungsten, molybdenum and rhenium diffused to a lesser degree under these conditions. It was discovered that there is significant interaction between many of the alloying elements in these systems during the diffusion anneal. The limitations of the analytical technique are summarized. (orig.)

  9. The role of a retinoic acid response element in establishing the anterior neural expression border of Hoxd4 transgenes.

    Science.gov (United States)

    Nolte, Christof; Amores, Angel; Nagy Kovács, Erzsébet; Postlethwait, John; Featherstone, Mark

    2003-03-01

    The zebrafish hoxd4a locus was compared to its murine ortholog, Hoxd4. The sequence of regulatory elements, including a DR5 type retinoic acid response element (RARE) required for Hoxd4 neural enhancer activity, are highly conserved. Additionally, zebrafish and mouse neural enhancers function identically in transgenic mouse embryos. We tested whether sequence conservation reflects functional importance by altering the spacing and sequence of the RARE in the Hoxd4 neural enhancer. Stabilizing receptor-DNA interactions did not anteriorize transgene expression. By contrast, conversion of the RARE from a DR5 to a DR2 type element decreased receptor-DNA stability and posteriorized expression. Hence, the setting of the Hox anterior expression border is not a simple function of the affinity of retinoid receptors for their cognate element.

  10. Widespread Alu repeat-driven expansion of consensus DR2 retinoic acid response elements during primate evolution

    Directory of Open Access Journals (Sweden)

    Wang Tian-Tian

    2007-01-01

    Full Text Available Abstract Background Nuclear receptors are hormone-regulated transcription factors whose signaling controls numerous aspects of development and physiology. Many receptors recognize DNA hormone response elements formed by direct repeats of RGKTCA motifs separated by 1 to 5 bp (DR1-DR5. Although many known such response elements are conserved in the mouse and human genomes, it is unclear to which extent transcriptional regulation by nuclear receptors has evolved specifically in primates. Results We have mapped the positions of all consensus DR-type hormone response elements in the human genome, and found that DR2 motifs, recognized by retinoic acid receptors (RARs, are heavily overrepresented (108,582 elements. 90% of these are present in Alu repeats, which also contain lesser numbers of other consensus DRs, including 50% of consensus DR4 motifs. Few DR2s are in potentially mobile AluY elements and the vast majority are also present in chimp and macaque. 95.5% of Alu-DR2s are distributed throughout subclasses of AluS repeats, and arose largely through deamination of a methylated CpG dinucleotide in a non-consensus motif present in AluS sequences. We find that Alu-DR2 motifs are located adjacent to numerous known retinoic acid target genes, and show by chromatin immunoprecipitation assays in squamous carcinoma cells that several of these elements recruit RARs in vivo. These findings are supported by ChIP-on-chip data from retinoic acid-treated HL60 cells revealing RAR binding to several Alu-DR2 motifs. Conclusion These data provide strong support for the notion that Alu-mediated expansion of DR elements contributed to the evolution of gene regulation by RARs and other nuclear receptors in primates and humans.

  11. cAMP-independent role of PKA in tonicity-induced transactivation of tonicity-responsive enhancer/ osmotic response element-binding protein

    OpenAIRE

    2002-01-01

    Hypertonicity-induced increase in activity of the transcription factor tonicity-responsive enhancer/osmotic response element-binding protein (TonEBP/OREBP) protects renal cells by increasing transcription of genes, including those involved in increased accumulation of organic osmolytes. We previously showed that hypertonicity increases transactivating activity of TonEBP/OREBP. Assay with a binary GAL4 transactivation system showed that the 984 C-terminal amino acids of TonEBP/OREBP (amino aci...

  12. Profiling Environmental Chemicals for Activity in the Antioxidant Response Element Signaling Pathway Using a High-Throughput Screening Approach

    Science.gov (United States)

    1 ABSTRACT 2 3 BACKGROUND: Oxidative stress has been implicated in the pathogenesis of a variety 4 of diseases ranging from cancer to neurodegeneration, highlighti.ng the need to identify 5 chemicals that can induce this effect. The antioxidant response element (ARE)...

  13. The catalytic subunit of cAMP-dependent protein kinase induces expression of genes containing cAMP-responsive enhancer elements.

    Science.gov (United States)

    Riabowol, K T; Fink, J S; Gilman, M Z; Walsh, D A; Goodman, R H; Feramisco, J R

    1988-11-03

    Transcriptional regulation of eukaryotic genes by cyclic AMP requires a cAMP-dependent protein kinase (A kinase). Two hypotheses have been proposed to explain how the holoenzyme of the A kinase induces transcription. The regulatory subunits of the A kinase, which bind cAMP and DNA, and have amino-acid homology with the Escherichia coli catabolite activator protein could directly stimulate gene expression. Alternatively, phosphorylation by the catalytic subunits could induce transcription by activating proteins involved in gene transcription. To distinguish between these models, we microinjected purified preparations of the catalytic and regulatory subunits of A kinase into tissue culture cells and monitored expression of a stably integrated fusion gene containing a cAMP-responsive human promoter fused to a bacterial reporter gene, or of the endogenous c-fos gene. The catalytic subunit stimulated expression of these genes, whereas the regulatory subunit did not. These results indicate that the catalytic subunit of A kinase is sufficient to induce expression of two cAMP-responsive genes, without increasing levels of cAMP.

  14. Glucose Enhances Basal or Melanocortin-Induced cAMP-Response Element Activity in Hypothalamic Cells.

    Science.gov (United States)

    Breit, Andreas; Wicht, Kristina; Boekhoff, Ingrid; Glas, Evi; Lauffer, Lisa; Mückter, Harald; Gudermann, Thomas

    2016-07-01

    Melanocyte-stimulating hormone (MSH)-induced activation of the cAMP-response element (CRE) via the CRE-binding protein in hypothalamic cells promotes expression of TRH and thereby restricts food intake and increases energy expenditure. Glucose also induces central anorexigenic effects by acting on hypothalamic neurons, but the underlying mechanisms are not completely understood. It has been proposed that glucose activates the CRE-binding protein-regulated transcriptional coactivator 2 (CRTC-2) in hypothalamic neurons by inhibition of AMP-activated protein kinases (AMPKs), but whether glucose directly affects hypothalamic CRE activity has not yet been shown. Hence, we dissected effects of glucose on basal and MSH-induced CRE activation in terms of kinetics, affinity, and desensitization in murine, hypothalamic mHypoA-2/10-CRE cells that stably express a CRE-dependent reporter gene construct. Physiologically relevant increases in extracellular glucose enhanced basal or MSH-induced CRE-dependent gene transcription, whereas prolonged elevated glucose concentrations reduced the sensitivity of mHypoA-2/10-CRE cells towards glucose. Glucose also induced CRCT-2 translocation into the nucleus and the AMPK activator metformin decreased basal and glucose-induced CRE activity, suggesting a role for AMPK/CRTC-2 in glucose-induced CRE activation. Accordingly, small interfering RNA-induced down-regulation of CRTC-2 expression decreased glucose-induced CRE-dependent reporter activation. Of note, glucose also induced expression of TRH, suggesting that glucose might affect the hypothalamic-pituitary-thyroid axis via the regulation of hypothalamic CRE activity. These findings significantly advance our knowledge about the impact of glucose on hypothalamic signaling and suggest that TRH release might account for the central anorexigenic effects of glucose and could represent a new molecular link between hyperglycaemia and thyroid dysfunction.

  15. Characterization and localization of metal-responsive-element-binding transcription factors from tilapia

    Energy Technology Data Exchange (ETDEWEB)

    Cheung, Andrew Pok-Lap; Au, Candy Yee-Man; Chan, William Wai-Lun [Department of Biochemistry, Chinese University of Hong Kong, Sha Tin, N.T., Hong Kong (Hong Kong); Chan, King Ming, E-mail: kingchan@cuhk.edu.hk [Department of Biochemistry, Chinese University of Hong Kong, Sha Tin, N.T., Hong Kong (Hong Kong)

    2010-08-01

    Two isoforms of MTF-1, MTF-1L (long form) and MTF-1S (short form), were cloned in tilapia (Ti) and characterized in a tilapia liver cell line, Hepa-T1. The cloned tiMTF-1L has the characteristics of all of the tiMTF-1S identified so far with the zinc finger domain having six fingers, the acidic-rich, proline-rich, and serine/threonine-rich domains; however, the short form encodes for the zinc finger domain with five zinc fingers only and no other domains. The transient transfection of tiMTF-1L into human HepG2 cells showed both constitutive and zinc-induced metal-responsive-element (MRE)-driven reporter gene expression. However, the transfection of tiMTF-1S (which lacks all three transactivation domains) into a human cell line showed reduced transcriptional activities compared with an endogenous control in both basal- and Zn{sup 2+}-induced conditions. The tiMTF-1 isoforms were tagged with GFP and transfected into Hepa-T1 cells (tilapia hepatocytes). The nuclear translocation of tiMTF-1L was observed when the cells were exposed to a sufficient concentration of metals for 6 h. However, tiMTF-1S, was localized in the nucleus with or without metal treatment. Electrophoretic mobility shift assay (EMSA) confirmed that both of the isoforms were able to bind to the MRE specifically in vitro. Tissue distribution studies showed that tiMTF-1L was more abundant than tiMTF-1S in all of the tissues tested.

  16. What is the primary beam response of an interferometer with unequal elements?

    NARCIS (Netherlands)

    Strom, R.G.; Bachiller, R.; Colomer, F.; Desmurs, J.F.; de Vicente, P.

    2004-01-01

    The EVN stations encompass elements with a range of diameters, even including an interferometer (the Westerbork Telescope, with up to 14 elements used together as a tied array). In combination, the various station pairs will each produce their own primary beam envelopes, with which the interferomete

  17. Plant-soil distribution of potentially toxic elements in response to elevated atmospheric CO2.

    Science.gov (United States)

    Duval, Benjamin D; Dijkstra, Paul; Natali, Susan M; Megonigal, J Patrick; Ketterer, Michael E; Drake, Bert G; Lerdau, Manuel T; Gordon, Gwyneth; Anbar, Ariel D; Hungate, Bruce A

    2011-04-01

    The distribution of contaminant elements within ecosystems is an environmental concern because of these elements' potential toxicity to animals and plants and their ability to hinder microbial ecosystem services. As with nutrients, contaminants are cycled within and through ecosystems. Elevated atmospheric CO2 generally increases plant productivity and alters nutrient element cycling, but whether CO2 causes similar effects on the cycling of contaminant elements is unknown. Here we show that 11 years of experimental CO2 enrichment in a sandy soil with low organic matter content causes plants to accumulate contaminants in plant biomass, with declines in the extractable contaminant element pools in surface soils. These results indicate that CO2 alters the distribution of contaminant elements in ecosystems, with plant element accumulation and declining soil availability both likely explained by the CO2 stimulation of plant biomass. Our results highlight the interdependence of element cycles and the importance of taking a broad view of the periodic table when the effects of global environmental change on ecosystem biogeochemistry are considered.

  18. Trainer Guide: Business and Finance Managerial. Camp Administration Series.

    Science.gov (United States)

    Farley, Elizabeth, Ed.

    Suggested ideas on conducting a managerial workshop for camp directors are offered in this trainer's guide. Workshops must be at least one full day of training (6 hours) on each topic to be counted toward the American Camping Association (ACA) Camp Director Certification Program. Suggested topics to be addressed are: (1) basic principles and…

  19. 14 CFR 91.1427 - CAMP: Manual requirements.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 2 2010-01-01 2010-01-01 false CAMP: Manual requirements. 91.1427 Section... Operations Program Management § 91.1427 CAMP: Manual requirements. (a) Each program manager who maintains program aircraft under a CAMP must put in the operating manual the chart or description of the...

  20. Benefits of Residential and Nonresidential Youth Summer Camps.

    Science.gov (United States)

    Ross, David M.; Driver, B. L.

    1988-01-01

    Describes survey made as part of Youth Conservation Corps evaluation. Compares personal benefits of residential camping with benefits of nonresidential camps. Concludes residential participants benefited in different ways and to greater extent than nonresidential campers. Residential camping benefits measurable at least nine months after…

  1. Camp Health Aide Manual = Manual para trabajadores de salud.

    Science.gov (United States)

    Robinson, June Grube; And Others

    This bilingual manual serves as a textbook for migrant Camp Health Aides. Camp Health Aides are members of migrant labor camps enlisted to provide information about health and social services to migrant workers and their families. The manual is divided into 12 tabbed sections representing lessons. Teaching notes printed on contrasting paper…

  2. Summer Camp and Positive Youth Development: Program with Romanian Youth

    Science.gov (United States)

    Feenstra, Jennifer S.

    2015-01-01

    A variety of activities are used in camps to help promote positive youth development, improving social skills and self-esteem in campers. I expanded on previous camp research in this study to address the influence camps have on trust, belief in the honesty of others, empowerment, and care for others in youth in Eastern Europe. Since 1999, New…

  3. Evidence for cAMP as a mediator of gonadotropin secretion from male pituitaries

    Energy Technology Data Exchange (ETDEWEB)

    Bourne, G.A.; Baldwin, D.M.

    1987-09-01

    The purpose of this study was to use sodium flufenamate, a compound that inhibits gonadotropin-releasing hormone (GnRH)-stimulated adenosine 3',5'-cyclic monophosphate (cAMP) production in the pituitary, to evaluate the potential role of cAMP as a mediator of GnRH-stimulated gonadotropin secretion from male pituitaries. Quartered male pituitaries were perifused at 37/sup 0/C and sequential effluent fractions collected every 10 min. Infusions of GnRH resulted in a twofold increase in luteinizing hormone (LH) and follicle-stimulating hormone (FSH) secretion. Cycloheximide, 5 ..mu..M, completely inhibited the GnRH-stimulated LH and FSH secretion. Infusions of 0.1 mM flufenamate had similar effects on gonadotropin secretion as cycloheximide, whereas the administration of 5 mM dibutyryl cAMP in combination with GnRH and flufenamate restored the secretory responses of both hormones. The flufenamate-inhibited GnRH stimulated LH and FSH release, which was restored by DBcAMP and appeared to be protein synthesis dependent and specific for cAMP.These results suggest an indirect role for cAMP as a mediator of gonadotropin secretion from male pituitaries. However, in contrast to female pituitaries, the secretion of these hormones form male pituitaries is completely dependent on cAMP and de novo protein synthesis.

  4. Refugees in and out North Africa: a study of the Choucha refugee camp in Tunisia.

    Science.gov (United States)

    Dourgnon, Paul; Kassar, Hassène

    2014-08-01

    In recent years, North African (NA) countries ceased to be emigration-only countries and are now on the verge of becoming immigration as well as transit countries for economic migrants and refugees. Contextual as well as structural long-term factors are driving these changes. The ongoing crises in Africa and the Middle East are prompting strong outflows of refugees, which are likely to induce NA countries to share some common public policy and public health concerns with European countries in a near future. This article highlights some aspects of these changes, from the study of the consequences of the 2011 Libyan crisis in Tunisia. It addresses individual trajectories and health concerns of refugees in and out North Africa from a study of the Choucha camp in Tunisia. The camp opened to immigrants from Libya during the 2011 crisis and accommodated the bulk of the refugees flow to Tunisia until July 2012. The study includes a monographic approach and a qualitative survey in the Choucha camp refugees. We describe the crisis history and the health response with a focus on the camp. We then address refugees' trajectories, and health needs and concerns from the interviews we collected in the camp in April 2012.

  5. The effect of hypoxia on PGE2-stimulated cAMP generation in HMEC-1.

    Science.gov (United States)

    Wiktorowska-Owczarek, Anna; Owczarek, Jacek

    2015-06-01

    Prostaglandin E2 (PGE2) is generated in various cells, including endothelial cells, and is responsible for various functions, such as vascular relaxation and angiogenesis. Effects of PGE2 are mediated via receptors EP1-EP4, among which EP2 and EP4 are coupled to Gs protein which activates adenylate cyclase (AC) and cAMP synthesis. The aim of this work was to study the ability of human microvascular endothelial cells (HMEC-1) to synthesize cAMP in the presence of PGE2, and to determine the effect of hypoxia on the PGE2- stimulated cAMP level. It was decided to evaluate the effect of PGE2 on the secretion of VEGF, an inducer of angiogenesis. In summary, our findings show that PGE2 induces cAMP production, but hypoxia may impair PGE2-stimulated activity of the AC-cAMP signaling pathway. These results suggest that the cardioprotective effect of PGE2/EP4/cAMP may be attenuated during ischemia. Furthermore, this study indicates that the pro-angiogenic effect of PGE2 is not associated with VEGF secretion in HMEC-1 cells.

  6. 22 CFR 62.30 - Camp counselors.

    Science.gov (United States)

    2010-04-01

    ... 22 Foreign Relations 1 2010-04-01 2010-04-01 false Camp counselors. 62.30 Section 62.30 Foreign Relations DEPARTMENT OF STATE PUBLIC DIPLOMACY AND EXCHANGES EXCHANGE VISITOR PROGRAM Specific Program... programs promote international understanding by improving American knowledge of foreign cultures...

  7. Conduct Disorders: Are Boot Camps Effective?

    Science.gov (United States)

    Jeter, LaVaughn V.

    2010-01-01

    Youth diagnosed with "conduct disorder" are often placed in programs using forced compliance and coercive control. One type of intervention used to treat conduct disorder is the boot camp. The basic idea is that disruptive behaviors can be corrected by strict behavioral regulation and an emphasis on skills training (Weis & Toolis 2009; Weis,…

  8. CS Radar Imaging via Adaptive CAMP

    NARCIS (Netherlands)

    Anitori, L.; Otten, M.P.G.; Hoogeboom, P.

    2012-01-01

    In this paper we present results on application of Compressive Sensing (CS) to high resolution radar imaging and pro- pose the adaptive Complex Approximate Message Passing (CAMP) algorithm for image reconstruction. CS provides a theoretical framework that guarantees, under certain assumptions, recon

  9. E. Coli: Preventing Outbreaks at Camp.

    Science.gov (United States)

    McKinney, Mary D.

    1996-01-01

    One strain of E. coli is not usually found in foods, but has been related to consumption of undercooked ground beef. Symptoms are stomach cramps and diarrhea, and 2-7% of infections lead to hemolytic uremic syndrome, which is life threatening. Camps can prevent outbreaks by avoiding uncooked meat on overnight campouts and requiring appropriate…

  10. 36 CFR 13.1402 - Camping.

    Science.gov (United States)

    2010-07-01

    ... 36 Parks, Forests, and Public Property 1 2010-07-01 2010-07-01 false Camping. 13.1402 Section 13.1402 Parks, Forests, and Public Property NATIONAL PARK SERVICE, DEPARTMENT OF THE INTERIOR NATIONAL PARK SYSTEM UNITS IN ALASKA Special Regulations-Klondike Gold Rush National Historical Park §...

  11. Rights and responsibilities in Darfur

    Directory of Open Access Journals (Sweden)

    Katherine Reyes

    2009-09-01

    Full Text Available A combined UN-military-police-humanitarian initiative hasbeen promoting civic rights and responsibilities among IDPsin order to increase security throughout Kalma camp and itssurroundings.

  12. Balancing Educational Practice with Psychological Theory: Lukinsky's Study of a Bold Camp Ramah Curriculum

    Science.gov (United States)

    Reimer, Joseph

    2016-01-01

    Missing from the growing literature on Jewish camps is Lukinsky's (1968) pioneering study of the curriculum to teach responsibility that he designed for the 1966 Ramah American Seminar. Reviewing this work I discovered that Lukinsky--under Schwab's (1971) influence--creates a rare balance between his own perspectives as an educational practitioner…

  13. Activation of extracellular signal-regulated kinases, NF-kappa B, and cyclic adenosine 5'-monophosphate response element-binding protein in lung neutrophils occurs by differing mechanisms after hemorrhage or endotoxemia.

    Science.gov (United States)

    Abraham, E; Arcaroli, J; Shenkar, R

    2001-01-01

    Acute lung injury is frequently associated with sepsis or blood loss and is characterized by a proinflammatory response and infiltration of activated neutrophils into the lungs. Hemorrhage or endotoxemia result in activation of cAMP response element-binding protein (CREB) and NF-kappa B in lung neutrophils as well as increased expression of proinflammatory cytokines, such as TNF-alpha and macrophage-inflammatory peptide-2, by these cells. Activation of the extracellular regulated kinase (ERK) pathway occurs in stress responses and is involved in CREB activation. In the present experiments, hemorrhage or endotoxemia produced increased activation of mitogen-activated protein kinase kinase (MEK)1/2 and ERK2 (p42), but not of ERK1 (p44), in lung neutrophils. ERK1, ERK2, and MEK1/2 were not activated in peripheral blood neutrophils after hemorrhage or endotoxemia. Inhibition of xanthine oxidase led to further increase in the activation of MEK1/2 and ERK2 in lung neutrophils after hemorrhage, but not after endotoxemia. Alpha-adrenergic blockade before hemorrhage resulted in increased activation in lung neutrophils of MEK1/2, ERK1, ERK2, and CREB, but decreased activation of NF-kappa B. In contrast, alpha-adrenergic blockade before endotoxemia was associated with decreased activation of MEK1/2, ERK2, and CREB, but increased activation of NF-kappa B. Beta-adrenergic blockade before hemorrhage did not alter MEK1/2 or ERK1 activation in lung neutrophils, but decreased activation of ERK2 and CREB, while increasing activation of NF-kappa B. Beta-adrenergic inhibition before endotoxemia did not affect activation of MEK1/2, ERK1, ERK2, CREB, or NF-kappa B. These data indicate that the pathways leading to lung neutrophil activation after hemorrhage are different from those induced by endotoxemia.

  14. Quality assessment of structure and language elements of written responses given by seven Scandinavian drug information centres

    DEFF Research Database (Denmark)

    Reppe, Linda Amundstuen; Spigset, Olav; Kampmann, Jens Peter

    2017-01-01

    for which queries were part of the study. The responses were assessed qualitatively by six clinical pharmacologists (internal experts) and six general practitioners (GPs, external experts). In addition, linguistic aspects of the responses were evaluated by a plain language expert. RESULTS: The quality......PURPOSE: The aim of this study was to identify structure and language elements affecting the quality of responses from Scandinavian drug information centres (DICs). METHODS: Six different fictitious drug-related queries were sent to each of seven Scandinavian DICs. The centres were blinded...... of responses was generally judged as satisfactory to good. Presenting specific advice and conclusions were considered to improve the quality of the responses. However, small nuances in language formulations could affect the individual judgments of the experts, e.g. on whether or not advice was given. Some...

  15. Requirement of cAMP signaling for Schwann cell differentiation restricts the onset of myelination.

    Science.gov (United States)

    Bacallao, Ketty; Monje, Paula V

    2015-01-01

    Isolated Schwann cells (SCs) respond to cAMP elevation by adopting a differentiated post-mitotic state that exhibits high levels of Krox-20, a transcriptional enhancer of myelination, and mature SC markers such as the myelin lipid galactocerebroside (O1). To address how cAMP controls myelination, we performed a series of cell culture experiments which compared the differentiating responses of isolated and axon-related SCs to cAMP analogs and ascorbate, a known inducer of axon ensheathment, basal lamina formation and myelination. In axon-related SCs, cAMP induced the expression of Krox-20 and O1 without a concomitant increase in the expression of myelin basic protein (MBP) and without promoting axon ensheathment, collagen synthesis or basal lamina assembly. When cAMP was provided together with ascorbate, a dramatic enhancement of MBP expression occurred, indicating that cAMP primes SCs to form myelin only under conditions supportive of basal lamina formation. Experiments using a combination of cell permeable cAMP analogs and type-selective adenylyl cyclase (AC) agonists and antagonists revealed that selective transmembrane AC (tmAC) activation with forskolin was not sufficient for full SC differentiation and that the attainment of an O1 positive state also relied on the activity of the soluble AC (sAC), a bicarbonate sensor that is insensitive to forskolin and GPCR activation. Pharmacological and immunological evidence indicated that SCs expressed sAC and that sAC activity was required for morphological differentiation and the expression of myelin markers such as O1 and protein zero. To conclude, our data indicates that cAMP did not directly drive myelination but rather the transition into an O1 positive state, which is perhaps the most critical cAMP-dependent rate limiting step for the onset of myelination. The temporally restricted role of cAMP in inducing differentiation independently of basal lamina formation provides a clear example of the uncoupling of signals

  16. Requirement of cAMP signaling for Schwann cell differentiation restricts the onset of myelination.

    Directory of Open Access Journals (Sweden)

    Ketty Bacallao

    Full Text Available Isolated Schwann cells (SCs respond to cAMP elevation by adopting a differentiated post-mitotic state that exhibits high levels of Krox-20, a transcriptional enhancer of myelination, and mature SC markers such as the myelin lipid galactocerebroside (O1. To address how cAMP controls myelination, we performed a series of cell culture experiments which compared the differentiating responses of isolated and axon-related SCs to cAMP analogs and ascorbate, a known inducer of axon ensheathment, basal lamina formation and myelination. In axon-related SCs, cAMP induced the expression of Krox-20 and O1 without a concomitant increase in the expression of myelin basic protein (MBP and without promoting axon ensheathment, collagen synthesis or basal lamina assembly. When cAMP was provided together with ascorbate, a dramatic enhancement of MBP expression occurred, indicating that cAMP primes SCs to form myelin only under conditions supportive of basal lamina formation. Experiments using a combination of cell permeable cAMP analogs and type-selective adenylyl cyclase (AC agonists and antagonists revealed that selective transmembrane AC (tmAC activation with forskolin was not sufficient for full SC differentiation and that the attainment of an O1 positive state also relied on the activity of the soluble AC (sAC, a bicarbonate sensor that is insensitive to forskolin and GPCR activation. Pharmacological and immunological evidence indicated that SCs expressed sAC and that sAC activity was required for morphological differentiation and the expression of myelin markers such as O1 and protein zero. To conclude, our data indicates that cAMP did not directly drive myelination but rather the transition into an O1 positive state, which is perhaps the most critical cAMP-dependent rate limiting step for the onset of myelination. The temporally restricted role of cAMP in inducing differentiation independently of basal lamina formation provides a clear example of the

  17. High adenylyl cyclase activity and in vivo cAMP fluctuations in corals suggest central physiological role.

    Science.gov (United States)

    Barott, K L; Helman, Y; Haramaty, L; Barron, M E; Hess, K C; Buck, J; Levin, L R; Tresguerres, M

    2013-01-01

    Corals are an ecologically and evolutionarily significant group, providing the framework for coral reef biodiversity while representing one of the most basal of metazoan phyla. However, little is known about fundamental signaling pathways in corals. Here we investigate the dynamics of cAMP, a conserved signaling molecule that can regulate virtually every physiological process. Bioinformatics revealed corals have both transmembrane and soluble adenylyl cyclases (AC). Endogenous cAMP levels in live corals followed a potential diel cycle, as they were higher during the day compared to the middle of the night. Coral homogenates exhibited some of the highest cAMP production rates ever to be recorded in any organism; this activity was inhibited by calcium ions and stimulated by bicarbonate. In contrast, zooxanthellae or mucus had >1000-fold lower AC activity. These results suggest that cAMP is an important regulator of coral physiology, especially in response to light, acid/base disturbances and inorganic carbon levels.

  18. SANTOS - a two-dimensional finite element program for the quasistatic, large deformation, inelastic response of solids

    Energy Technology Data Exchange (ETDEWEB)

    Stone, C.M.

    1997-07-01

    SANTOS is a finite element program designed to compute the quasistatic, large deformation, inelastic response of two-dimensional planar or axisymmetric solids. The code is derived from the transient dynamic code PRONTO 2D. The solution strategy used to compute the equilibrium states is based on a self-adaptive dynamic relaxation solution scheme, which is based on explicit central difference pseudo-time integration and artificial mass proportional damping. The element used in SANTOS is a uniform strain 4-node quadrilateral element with an hourglass control scheme to control the spurious deformation modes. Finite strain constitutive models for many common engineering materials are included. A robust master-slave contact algorithm for modeling sliding contact is implemented. An interface for coupling to an external code is also provided. 43 refs., 22 figs.

  19. Boot Camps for Charter Boards

    Science.gov (United States)

    Kronholz, June

    2015-01-01

    This article addresses the question of who owns the responsibility when a charter school gets into trouble--when its students aren't learning, or it misses its enrollment targets, or money runs short, or it closes. Upon presenting this question to a director of a charter school, a board member, and a Massachusetts-based education consultant and…

  20. Summer camps for children with burn injuries: a literature review.

    Science.gov (United States)

    Maslow, Gary R; Lobato, Debra

    2010-01-01

    The first summer camps for children with burn injuries started over 25 years ago, and as of 2008, there were 60 camps worldwide. This review examines the literature on summer pediatric burn camps. The authors describe common characteristics of burn camp structure, activities, and staffing and then examine the scientific evidence regarding the effect of burn camp programs on campers and camp staff volunteers. A search of Pubmed and Psychinfo databases from 1970 to 2008 for articles related to pediatric burn summer camps identified 17 articles, of which 13 fit the inclusion criteria. Existing literature consists primarily of qualitative studies, suggesting that burn camp can decrease camper isolation, improve self-esteem, and promote coping and social skills. Studies examining volunteer staff at burn camp have consistently found that there are both personal and professional benefits. Quantitative studies of self-esteem have yielded equivocal results. No studies have examined safety or the effect of burn camp on medical or rehabilitation outcomes. For the past 25 years, pediatric summer camps for children with burn injuries have played an important rehabilitation role and provided a strong community that benefits both campers and staff. Future research using more rigorous research methods and examining a broader range of outcomes (eg, safety and medical/rehabilitation outcomes) is recommended.

  1. How to run a successful and educational basketball camp

    Directory of Open Access Journals (Sweden)

    Brooke LeMar

    2015-04-01

    Full Text Available Camps are a great introduction to the sport of basketball for children. Universities and colleges usually offer different types of camps, typically during the summer months. Depending on the skill and maturity level of the player, basketball camps can serve a variety of purposes. Some popular types of camps include offensive skills, shooting, team, and youth camps. Regardless of the camp that is chosen, children need to have goals set for themselves before, during, and after to enhance the benefits. Each camper should have the opportunity to grow and develop as a basketball player as well as an individual. Running a successful camp is not only rewarding for the coaches, but for the players and campers too, which ultimately leads to the campers choosing to come back every year.

  2. Evidence for cAMP as a mediator of gonadotropin secretion from female pituitaries

    Energy Technology Data Exchange (ETDEWEB)

    Bourne, G.A.; Baldwin, D.M.

    1987-09-01

    Sodium flufenamate, which inhibited gonadotropin-releasing hormone (GnRH)-stimulated increases in adenosine 3',5'-cyclic monophosphate (cAMP), was used to evaluate the potential role of cAMP as a mediator of GnRH-stimulated gonadotropin secretion. Quartered pituitaries from diestrous II female rats were perifused at 37/sup 0/C, and sequential effluent fractions were collected every 10 min. Administration of GnRH resulted in a characteristic biphasic response for both luteinizing hormone (LH) and follicle-stimulating hormone (FSH), whereas 5 ..mu..M cycloheximide inhibited the secondary augmented responses (phase II) of both hormones. Infusions of 0.1 mM flufenamate inhibited GnRH-stimulated gonadotropin secretion in a manner similar to that of cycloheximide, whereas the administration of 5 mM dibutyryl cAMP in combination with GnRH and flufenamate resulted in the restoration of LH and FSH secretion. The dibutyryl cAMP-restored response appeared to be protein synthesis dependent and specific for cAMP. These results suggest that although the cyclic nucleotide is not involved in the acute release of LH and FSH, it does appear to play a pivotal but indirect role in phase II release of the hormones, by effects involving the stimulation of de novo protein synthesis.

  3. EARTHQUAKE RESPONSE ANALYSIS OF STEEL PORTAL FRAMES BY PSEUDODYNAMIC SIMULATION TECHNIQUE USING A GENERAL-PURPOSE FINITE ELEMENT ANALYSIS PROGRAM

    Science.gov (United States)

    Miki, Toshihiro; Mizusawa, Tomisaku; Yamada, Osamu; Toda, Tomoki

    This paper studies the earthquake response of steel portal frames when the shear collapse occurs at the centre of the beam. The pseudodynamic simulation technique for the earthquake response analysis of the frames is developed in correspondence to the pseudodynamic substructure testing method. For the thin-walled box element under shear force in the middle of beam, the numerical process is utilized by a general-purpose finite element analysis program. The numerical results show the shear collapse behaviour in stiffened box beams and corresponding restoring force - displacement relationship of frames. The advantages of shear collapse of beams for the use in frames during earthquakes are discussed from the point of view of the hysteretic energy dissipated by the column base.

  4. Regulation of Cox-2 by Cyclic AMP Response Element Binding Protein in Prostate Cancer: Potential Role for Nexrutine

    OpenAIRE

    Rita Ghosh; Gretchen E. Garcia; Katherine Crosby; Hiroyasu Inoue; Thompson, Ian M.; Troyer, Dean A.; Kumar, Addanki P.

    2007-01-01

    We recently showed that NexrutineR, a Phellodendron amurense bark extract, suppresses proliferation of prostate cancer cell lines and tumor development in the transgenic adenocarcinoma of mouse prostate (TRAMP) model. Our data also indicate that the antiproliferative effects of NexrutineR are mediated in part by Akt and Cyclic AMP response element binding protein (CREB). Cyclooxygenase (Cox-2), a pro-inflammatory mediator, is a CREB target that induces prostaglandin E2 (PGE2) and suppresses a...

  5. Enhancement of DNA vaccine-induced immune responses by a 72-bp element from SV40 enhancer

    Institute of Scientific and Technical Information of China (English)

    LI Hai-shan; XU Jian-qing; HONG Kun-xue; SHAO Yi-ming; LIU Yong; LI Ding-feng; ZHANG Ran-ran; TANG Hai-li; ZHANG Yu-wei; HUANG Wei; LIU Ying; PENG Hong

    2007-01-01

    Background Although DNA vaccine is considered as the next generation of vaccine, most DNA vaccine candidates are still suffering from the relatively weak immunogenicity despite the increased dosage of plasmid DNA administered. In order to enhance the immune responses elicited by a codon-optimized HIV gag DNA vaccine, a modified plasmid vector pDRVI1.0 and a booster immunization with replicating Tiantan vaccinia (RTV) strain expressing the same gene were employed.Methods Vector pDRVI1.0 was constructed through inserting the 72-bp element from the SV40 enhancer, which was reported promoting nuclear transport of plasmid DNA, to the upstream of cytomegalovirus enhancer/promoter region of the plasmid vector pVR1012. Gene expression levels from expression plasmids based on pDRVI1.0 and pVR1012 were tested. Humoral and cellular immune responses induced by DNA vaccine alone or DNA prime-RTV boost regimen were determined in mice.Results It was shown that the 72-bp element significantly enhanced the gene expression level in non-dividing cells.gag-specific humoral and cellular immune responses induced by DNA vaccination were both significantly improved, while the Th1/Th2 balance was not obviously affected by the 72-bp element. RTV boosting further significantly enhanced DNA vaccine-primed antibody and T cell responses in a Th1-biased manner.Conclusions The 72-bp SV40 enhancer element should be included in the DNA vaccine vector and RTV strain is a very efficient live vector for boosting immunization.

  6. Dis3- and exosome subunit-responsive 3 Prime mRNA instability elements

    Energy Technology Data Exchange (ETDEWEB)

    Kiss, Daniel L.; Hou, Dezhi [Case Western Reserve University School of Medicine, Department of Molecular Biology and Microbiology, Cleveland, OH 44106 (United States); Gross, Robert H. [Dartmouth College, Department of Biological Sciences, Life Sciences Center 343, Hanover, NH 03755 (United States); Andrulis, Erik D., E-mail: exa32@case.edu [Case Western Reserve University School of Medicine, Department of Molecular Biology and Microbiology, Cleveland, OH 44106 (United States)

    2012-07-06

    Highlights: Black-Right-Pointing-Pointer Successful use of a novel RNA-specific bioinformatic tool, RNA SCOPE. Black-Right-Pointing-Pointer Identified novel 3 Prime UTR cis-acting element that destabilizes a reporter mRNA. Black-Right-Pointing-Pointer Show exosome subunits are required for cis-acting element-mediated mRNA instability. Black-Right-Pointing-Pointer Define precise sequence requirements of novel cis-acting element. Black-Right-Pointing-Pointer Show that microarray-defined exosome subunit-regulated mRNAs have novel element. -- Abstract: Eukaryotic RNA turnover is regulated in part by the exosome, a nuclear and cytoplasmic complex of ribonucleases (RNases) and RNA-binding proteins. The major RNase of the complex is thought to be Dis3, a multi-functional 3 Prime -5 Prime exoribonuclease and endoribonuclease. Although it is known that Dis3 and core exosome subunits are recruited to transcriptionally active genes and to messenger RNA (mRNA) substrates, this recruitment is thought to occur indirectly. We sought to discover cis-acting elements that recruit Dis3 or other exosome subunits. Using a bioinformatic tool called RNA SCOPE to screen the 3 Prime untranslated regions of up-regulated transcripts from our published Dis3 depletion-derived transcriptomic data set, we identified several motifs as candidate instability elements. Secondary screening using a luciferase reporter system revealed that one cassette-harboring four elements-destabilized the reporter transcript. RNAi-based depletion of Dis3, Rrp6, Rrp4, Rrp40, or Rrp46 diminished the efficacy of cassette-mediated destabilization. Truncation analysis of the cassette showed that two exosome subunit-sensitive elements (ESSEs) destabilized the reporter. Point-directed mutagenesis of ESSE abrogated the destabilization effect. An examination of the transcriptomic data from exosome subunit depletion-based microarrays revealed that mRNAs with ESSEs are found in every up-regulated mRNA data set but are

  7. Long-term cilostazol administration ameliorates memory decline in senescence-accelerated mouse prone 8 (SAMP8) through a dual effect on cAMP and blood-brain barrier.

    Science.gov (United States)

    Yanai, Shuichi; Toyohara, Jun; Ishiwata, Kiichi; Ito, Hideki; Endo, Shogo

    2016-12-12

    Phosphodiesterases (PDEs), which hydrolyze and inactivate 3', 5'-cyclic adenosine monophosphate (cAMP) and 3', 5'-cyclic guanosine monophosphate (cGMP), play an important role in synaptic plasticity that underlies memory. Recently, several PDE inhibitors were assessed for their possible therapeutic efficacy in treating cognitive disorders. Here, we examined how cilostazol, a selective PDE3 inhibitor, affects brain functions in senescence-accelerated mouse prone 8 (SAMP8), an animal model of age-related cognitive impairment. Long-term administration of cilostazol restored the impaired context-dependent conditioned fear memory of SAMP8 to match that in normal aging control substrain SAMR1. Cilostazol also increased the number of cells containing phosphorylated cAMP-responsive element binding protein (CREB), a downstream component of the cAMP pathway. Finally, cilostazol improves blood-brain barrier (BBB) integrity, demonstrated by reduced extravasation of 2-deoxy-2-(18)F-fluoro-d-glucose and Evans Blue dye in the brains of SAMP8. This improvement in BBB integrity was associated with an increased amount of zona occludens protein 1 (ZO-1) and occludin proteins, components of tight junctions integral to the BBB. The results suggest that long-term administration of cilostazol exerts its beneficial effects on age-related cognitive impairment through a dual mechanism: by enhancing the cAMP system in the brain and by maintaining or improving BBB integrity.

  8. Androgen regulation of the TMPRSS2 gene and the effect of a SNP in an androgen response element.

    Science.gov (United States)

    Clinckemalie, Liesbeth; Spans, Lien; Dubois, Vanessa; Laurent, Michaël; Helsen, Christine; Joniau, Steven; Claessens, Frank

    2013-12-01

    More than 50% of prostate cancers have undergone a genomic reorganization that juxtaposes the androgen-regulated promoter of TMPRSS2 and the protein coding parts of several ETS oncogenes. These gene fusions lead to prostate-specific and androgen-induced ETS expression and are associated with aggressive lesions, poor prognosis, and early-onset prostate cancer. In this study, we showed that an enhancer at 13 kb upstream of the TMPRSS2 transcription start site is crucial for the androgen regulation of the TMPRSS2 gene when tested in bacterial artificial chromosomal vectors. Within this enhancer, we identified the exact androgen receptor binding sequence. This newly identified androgen response element is situated next to two binding sites for the pioneer factor GATA2, which were identified by DNase I footprinting. Both the androgen response element and the GATA-2 binding sites are involved in the enhancer activity. Importantly, a single nucleotide polymorphism (rs8134378) within this androgen response element reduces binding and transactivation by the androgen receptor. The presence of this SNP might have implications on the expression and/or formation levels of TMPRSS2 fusions, because both have been shown to be influenced by androgens.

  9. Identification of a functional antioxidant responsive element in the promoter of the Chinese hamster carbonyl reductase 3 (Chcr3) gene.

    Science.gov (United States)

    Miura, Takeshi; Taketomi, Ayako; Nakabayashi, Toshikatsu; Nishinaka, Toru; Terada, Tomoyuki

    2015-07-01

    CHCR3, a member of the short-chain dehydrogenase/reductase superfamily, is a carbonyl reductase 3 enzyme in Chinese hamsters. Carbonyl reductase 3 in humans has been believed to involve the metabolism and/or pharmacokinetics of anthracycline drugs, and the mechanism underlying the gene regulation has been investigated. In this study, the nucleotide sequence of the Chcr3 promoter was originally determined, and its promoter activity was characterised. The proximal promoter region is TATA-less and GC-rich, similar to the promoter region of human carbonyl reductase 3. Cobalt stimulated the transcriptional activity of the Chcr3 gene. The results of a luciferase gene reporter assay demonstrated that cobalt-induced stimulation required an antioxidant responsive element. Forced expression of Nrf2, the transcription factor that binds to antioxidant responsive elements, enhanced the transcriptional activity of the Chcr3 gene. These results suggest that cobalt induces the expression of the Chcr3 gene via the Nrf2-antioxidant responsive element pathway.

  10. The central role of cAMP in regulating Plasmodium falciparum merozoite invasion of human erythrocytes.

    Directory of Open Access Journals (Sweden)

    Amrita Dawn

    2014-12-01

    Full Text Available All pathogenesis and death associated with Plasmodium falciparum malaria is due to parasite-infected erythrocytes. Invasion of erythrocytes by P. falciparum merozoites requires specific interactions between host receptors and parasite ligands that are localized in apical organelles called micronemes. Here, we identify cAMP as a key regulator that triggers the timely secretion of microneme proteins enabling receptor-engagement and invasion. We demonstrate that exposure of merozoites to a low K+ environment, typical of blood plasma, activates a bicarbonate-sensitive cytoplasmic adenylyl cyclase to raise cytosolic cAMP levels and activate protein kinase A, which regulates microneme secretion. We also show that cAMP regulates merozoite cytosolic Ca2+ levels via induction of an Epac pathway and demonstrate that increases in both cAMP and Ca2+ are essential to trigger microneme secretion. Our identification of the different elements in cAMP-dependent signaling pathways that regulate microneme secretion during invasion provides novel targets to inhibit blood stage parasite growth and prevent malaria.

  11. Dual role of cAMP and involvement of both G-proteins and ras in regulation of ERK2 in Dictyostelium discoideum.

    Science.gov (United States)

    Knetsch, M L; Epskamp, S J; Schenk, P W; Wang, Y; Segall, J E; Snaar-Jagalska, B E

    1996-07-01

    Dictyostelium discoideum expresses two Extracellular signal Regulated Kinases, ERK1 and ERK2, which are involved in growth, multicellular development and regulation of adenylyl cyclase. Binding of extracellular cAMP to cAMP receptor 1, a G-protein coupled cell surface receptor, transiently stimulates phosphorylation, activation and nuclear translocation of ERK2. Activation of ERK2 by cAMP is dependent on heterotrimeric G-proteins, since activation of ERK2 is absent in cells lacking the Galpha4 subunit. The small G-protein rasD also activates ERK2. In cells overexpressing a mutated, constitutively active rasD, ERK2 activity is elevated prior to cAMP stimulation. Intracellular cAMP and cAMP-dependent protein kinase (PKA) are essential for adaptation of the ERK2 response. This report shows that multiple signalling pathways are involved in regulation of ERK2 activity in D.discoideum.

  12. 33 CFR Appendix C to Part 155 - Training Elements for Oil Spill Response Plans

    Science.gov (United States)

    2010-07-01

    ... delivered to the various personnel. Further, this section of the plan must work in harmony with those sections of the plan dealing with exercises, the spill management team, and the qualified individual. 1... plan, it is necessary for the plan to convey the elements that define the program as appropriate....

  13. Yoga camp in Ayurvedgrams of Chhattisgarh

    Directory of Open Access Journals (Sweden)

    Raghavendra Madhu

    2012-01-01

    Full Text Available The clinical and empirical health benefits of yoga and pranayam have been reiterated through research. Yoga is being adopted as a system to alleviate the burden of noncommunicable diseases (NCDs across the globe. The Directorate of AYUSH, Government of Chhattisgarh (DoA, GoCG conducts annual 5-day-yoga camp across 146 Ayurvedgrams in the State. The present article brings out the AYUSH initiatives the State is taking toward active ageing. A total of 71,096 people participated in the 5-day-yoga camp across the State. A mean participation of 5079 people over 5 days was reported across districts. Such statewide practices need to be promoted and appraised.

  14. Flaubert et Du Camp : quelques remarques

    Directory of Open Access Journals (Sweden)

    Michel Brix

    2016-12-01

    Full Text Available Les spécialistes de Flaubert ont fait de nombreux reproches à Maxime Du Camp et ne prêtent plus guère d’attention à ce qu’il a écrit. C’est une situation très regrettable, qui prive les lecteurs d’informations nombreuses, susceptibles d’éclairer les enjeux mais aussi les impasses et les contradictions du projet esthétique de Flaubert. Quelques cas significatifs sont évoqués dans le présent article, qui se penche plus particulièrement sur la ressemblance entre un passage du livre de Du Camp Le Nil (1854 et les lignes de L’Éducation sentimentale (1869 qui rapportent l’“apparition” de Mme Arnoux.

  15. cAMP dependent and independent regulation of thyroglobulin synthesis by two clones of the OVNIS 6H thyroid cell line.

    Science.gov (United States)

    Aouani, A; Hovsépian, S; Fayet, G

    1987-07-01

    The hormonal regulation of thyroglobulin synthesis has been studied using two independent clones of the OVNIS 6H cell line. Insulin, hydrocortisone and TSH were able to stimulate thyroglobulin synthesis, whereas transferrin, somatostatin and glycyl-histidyl-lysine were without effect. Insulin stimulated thyroglobulin synthesis without affecting cAMP production. Hydrocortisone, when combined with insulin was a stimulator too; this stimulation was not accompanied by an increase in cAMP. TSH alone was unable to stimulate either cAMP or thyroglobulin synthesis. The stimulatory effect of TSH on thyroglobulin synthesis took place only when combined with insulin or insulin plus hydrocortisone, and was mediated by cAMP. Consequently, insulin and hydrocortisone stimulated thyroglobulin synthesis by cAMP-independent mechanisms, whereas TSH acted via the cAMP system. Forskolin mimicked TSH effects on cAMP and thyroglobulin synthesis. Calf serum inhibited cAMP and thyroglobulin production. Optimal cAMP and thyroglobulin synthesis as well as TSH responsiveness were obtained in serum-free medium supplemented with 5 micrograms/ml insulin, 100 nM hydrocortisone and 1 mU/ml TSH.

  16. Core Concepts: Orthopedic Intern Curriculum Boot Camp.

    Science.gov (United States)

    Seeley, Mark A; Kazarian, Erick; King, Brandon; Biermann, Janet S; Carpenter, James E; Caird, Michelle S; Irwin, Todd A

    2016-01-01

    Orthopedic surgical interns must gain a broad array of clinical skills in a short time. However, recent changes in health care have limited resident-patient exposures. With the reported success of simulation training in the surgical literature, the American Board of Orthopaedic Surgery (ABOS) and Residency Review Committee for Orthopaedic Surgery have required that surgical simulation training be a component of the intern curricula in orthopedic surgical residencies. This study examined the short-term effectiveness of an orthopedic "intern boot camp" covering 7 of 17 simulation training concept modules published by the ABOS. Eight orthopedic post-graduate year 1 (PGY-1) residents (study group) completed a structured 3-month curriculum and were compared with 7 post-graduate year 2 (PGY-2) residents (comparison group) who had just completed their orthopedic surgical internship. Seven core skills were assessed using both task-specific and global rating scales. The PGY-1 residents demonstrated a statistically significant improvement in all 7 modules with respect to their task-specific pre-test scores: sterile technique (P=.001), wound closure (P<.001), knot tying (P=.017), casting and splinting (P<.001), arthrocentesis (P=.01), basics of internal fixation (P<.001), and compartment syndrome evaluation (P=.004). After the camp, PGY-1 and -2 scores in task-specific measures were not significantly different. A 3-month simulation-based boot camp instituted early in orthopedic internship elevated a variety of clinical skills to levels exhibited by PGY-2 residents.

  17. Altered beta-adrenergic receptor-stimulated cAMP formation in cultured skin fibroblasts from Alzheimer donors.

    Science.gov (United States)

    Huang, H M; Gibson, G E

    1993-07-15

    An alteration in signal transduction systems in Alzheimer's disease would likely be of pathophysiological significance, because these steps are critical to normal brain function. Since dynamic processes are difficult to study in autopsied brain, the current studies utilized cultured skin fibroblasts. The beta-adrenergic-stimulated increase in cAMP was reduced approximately 80% in fibroblasts from Alzheimer's disease compared with age-matched controls. The deficit in Alzheimer fibroblasts in response to various adrenergic agonists paralleled their beta-adrenergic potency, and enhancement of cAMP accumulation by a non-adrenergic agonist, such as prostaglandin E1, was similar in Alzheimer and control fibroblasts. Diminished adenylate cyclase activity did not underlie these abnormalities, since direct stimulation of adenylate cyclase by forskolin elevated cAMP production equally in Alzheimer and control fibroblasts. Cholera toxin equally stimulated cAMP formation in Alzheimer and control fibroblasts. Moreover, cholera toxin partially reduced isoproterenol-induced cAMP deficit in Alzheimer fibroblasts. Pertussis toxin, on the other hand, did not alter the Alzheimer deficits. The results suggest either that the coupling of the GTP-binding protein(s) to the beta-adrenergic receptor is abnormal or that the sensitivity of receptor is altered with Alzheimer's disease. Further, any hypothesis about Alzheimer's disease must explain why a reduced beta-adrenergic-stimulated cAMP formation persists in tissue culture.

  18. Modeling and assessment of the response of super-light elements to fire

    DEFF Research Database (Denmark)

    Hertz, Kristian Dahl; Campeanu, B.M.; Giraudo, M.

    2013-01-01

    in those cases, where a safe evacuation of the building is ensured, the high costs associated with the downtime and reparation of the building can be very high and not acceptable in the view of a safe and sustainable design of structures. In this respect, the newly patented building technology....... The implementation of a three-dimensional Finite Element Model (FEM) of the SL-deck is described and modelling aspects are discussed with particular reference to the sensitivity of the model to the thermal properties of the strong and light concrete. The results of the investigation are compared with the outcomes...... of the fire performances of complex concrete elements and in the focus on modelling issues related to the handling of the uncertainties. © 2013 Taylor & Francis Group....

  19. Modeling and assessment of the response of super-light elements to fire

    DEFF Research Database (Denmark)

    Hertz, Kristian Dahl; Campeanu, B.M.; Giraudo, M.

    in those cases, where a safe evacuation of the building is ensured, the high costs associated with the downtime and reparation of the building can be very high and not acceptable in the view of a safe and sustainable design of structures. In this respect, the newly patented building technology....... The implementation of a three-dimensional finite element model (FEM) of the SL-deck is described and modelling aspects are discussed with particular reference to the sensitivity of the model to the thermal properties of the strong and light concrete. The results of the investigation are compared with the outcomes...... of the fire performances of complex concrete elements and in the focus on modelling issues related to the handling of the uncertainties....

  20. A topology-motivated mixed finite element method for dynamic response of porous media

    CERN Document Server

    Lotfian, Zahrasadat

    2015-01-01

    In this paper, we propose a numerical method for computing solutions to Biot's fully dynamic model of incompressible saturated porous media [Biot;1956]. Our spatial discretization scheme is based on the three-field formulation (u-w-p) and the coupling of a lowest order Raviart-Thomas mixed element [Raviart,Thomas;1977] for fluid variable fields (w, p ) and a nodal Galerkin finite element for skeleton variable field (u). These mixed spaces are constructed based on the natural topology of the variables; hence, are physically compatible and able to exactly model the kind of continuity which is expected. The method automatically satisfies the well known LBB (inf-sup) stability condition and avoids locking that usually occurs in the numerical computations in the incompressible limit and very low hydraulic conductivity. In contrast to the majority of approaches, our three-field formulation can fully capture dynamic behavior of porous media even in high frequency loading phenomena with considerable fluid acceleratio...

  1. Study of the Internal Mechanical response of an asphalt mixture by 3-D Discrete Element Modeling

    DEFF Research Database (Denmark)

    Feng, Huan; Pettinari, Matteo; Hofko, Bernhard

    2015-01-01

    for all the distinct elements. The dynamic modulus and phase angle from uniaxial complex modulus tests of the asphalt mixtures in the laboratory have been collected. A macro-scale Burger’s model was first established and the input parameters of Burger’s contact model were calibrated by fitting......In this paper the viscoelastic behavior of asphalt mixture was investigated by employing a three-dimensional Discrete Element Method (DEM). The cylinder model was filled with cubic array of spheres with a specified radius, and was considered as a whole mixture with uniform contact properties...... with the lab test data of the complex modulus of the asphalt mixture. The Burger’s contact model parameters are usually calibrated for each frequency. While in this research a constant set of Burger’s parameters has been calibrated and used for all the test frequencies, the calibration procedure...

  2. Geological occurrence response to trace elemental migration in coal liquefaction based on SPSS: take no. 11 coalbed in Antaibao mine for example

    Science.gov (United States)

    Xia, Xiaohong; Qin, Yong; Yang, Weifeng

    2013-03-01

    Coal liquefaction is an adoptable method to transfer the solid fossil energy into liquid oil in large scale, but the dirty material in which will migrate to different step of liquefaction. The migration rule of some trace elements is response to the react activity of macerals in coal and the geological occurrence of the element nature of itself. In this paper, from the SPSS data correlation analysis and hierarchical clustering dendrogram about the trace elements with macerals respond to coal liquefaction yield, it shows the trace elements in No.11 Antaibao coal seam originated from some of lithophile and sulphophle elements. Correlation coefficient between liquefaction yield of three organic macerals and migration of the elements in liquefaction residue indicated that the lithophile are easy to transfer to residue, while sulphophle are apt to in the liquid products. The activated macerals are response to sulphophle trace elements. The conclusion is useful to the coal blending and environmental effects on coal direct liquefaction.

  3. Low-Velocity Impact Response and Finite Element Analysis of Four-Step 3-D Braided Composites

    Science.gov (United States)

    Sun, Baozhong; Zhang, Yan; Gu, Bohong

    2013-08-01

    The low-velocity impact characters of 3-D braided carbon/epoxy composites were investigated from experimental and finite element simulation approaches. The quasi-static tests were carried out at a constant velocity of 2 mm/min on MTS 810.23 material tester system to obtain the indentation load-displacement curves and indentation damages. The low-velocity tests were conducted at the velocities from 1 m/s to 6 m/s (corresponding to the impact energy from 3.22 J to 116 J) on Instron Dynatup 9250 impact tester. The peak force, energy for peak force, time to peak force, and total energy absorption were obtained to determine the impact responses of 3-D braided composites. A unit cell model was established according to the microstructure of 3-D braided composites to derive the constitutive equation. Based on the model, a user-defined material subroutine (VUMAT) has been compiled by FORTRAN and connected with commercial finite element code ABAQUS/Explicit to calculate the impact damage. The unit cell model successfully predicted the impact response of 3-D braided composites. Furthermore, the stress wave propagation and failure mechanisms have been revealed from the finite element simulation results and ultimate damage morphologies of specimens.

  4. MYC cis-Elements in PsMPT Promoter Is Involved in Chilling Response of Paeonia suffruticosa.

    Directory of Open Access Journals (Sweden)

    Yuxi Zhang

    Full Text Available The MPT transports Pi to synthesize ATP. PsMPT, a chilling-induced gene, was previously reported to promote energy metabolism during bud dormancy release in tree peony. In this study, the regulatory elements of PsMPT promoter involved in chilling response were further analyzed. The PsMPT transcript was detected in different tree peony tissues and was highly expressed in the flower organs, including petal, stigma and stamen. An 1174 bp of the PsMPT promoter was isolated by TAIL-PCR, and the PsMPT promoter::GUS transgenic Arabidopsis was generated and analyzed. GUS staining and qPCR showed that the promoter was active in mainly the flower stigma and stamen. Moreover, it was found that the promoter activity was enhanced by chilling, NaCl, GA, ACC and NAA, but inhibited by ABA, mannitol and PEG. In transgenic plants harboring 421 bp of the PsMPT promoter, the GUS gene expression and the activity were significantly increased by chilling treatment. When the fragment from -421 to -408 containing a MYC cis-element was deleted, the chilling response could not be observed. Further mutation analysis confirmed that the MYC element was one of the key motifs responding to chilling in the PsMPT promoter. The present study provides useful information for further investigation of the regulatory mechanism of PsMPT during the endo-dormancy release.

  5. Transcriptional regulation of the bovine leukemia virus promoter by the cyclic AMP-response element modulator tau isoform.

    Science.gov (United States)

    Nguyên, Thi Lien-Anh; de Walque, Stéphane; Veithen, Emmanuelle; Dekoninck, Ann; Martinelli, Valérie; de Launoit, Yvan; Burny, Arsène; Harrod, Robert; Van Lint, Carine

    2007-07-20

    Bovine leukemia virus (BLV) expression is controlled at the transcriptional level through three Tax(BLV)-responsive elements (TxREs) responsive to the viral transactivator Tax(BLV). The cAMP-responsive element (CRE)-binding protein (CREB) has been shown to interact with CRE-like sequences present in the middle of each of these TxREs and to play critical transcriptional roles in both basal and Tax(BLV)-transactivated BLV promoter activity. In this study, we have investigated the potential involvement of the cAMP-response element modulator (CREM) in BLV transcriptional regulation, and we have demonstrated that CREM proteins were expressed in BLV-infected cells and bound to the three BLV TxREs in vitro. Chromatin immunoprecipitation assays using BLV-infected cell lines demonstrated in the context of chromatin that CREM proteins were recruited to the BLV promoter TxRE region in vivo. Functional studies, in the absence of Tax(BLV), indicated that ectopic CREMtau protein had a CRE-dependent stimulatory effect on BLV promoter transcriptional activity. Cross-link of the B-cell receptor potentiated CREMtau transactivation of the viral promoter. Further experiments supported the notion that this potentiation involved CREMtau Ser-117 phosphorylation and recruitment of CBP/p300 to the BLV promoter. Although CREB and Tax(BLV) synergistically transactivated the BLV promoter, CREMtau repressed this Tax(BLV)/CREB synergism, suggesting that a modulation of the level of Tax(BLV) transactivation through opposite actions of CREB and CREMtau could facilitate immune escape and allow tumor development.

  6. GmDREB2A;2, a canonical DEHYDRATION-RESPONSIVE ELEMENT-BINDING PROTEIN2-type transcription factor in soybean, is posttranslationally regulated and mediates dehydration-responsive element-dependent gene expression.

    Science.gov (United States)

    Mizoi, Junya; Ohori, Teppei; Moriwaki, Takashi; Kidokoro, Satoshi; Todaka, Daisuke; Maruyama, Kyonoshin; Kusakabe, Kazuya; Osakabe, Yuriko; Shinozaki, Kazuo; Yamaguchi-Shinozaki, Kazuko

    2013-01-01

    Soybean (Glycine max) is an important crop around the world. Abiotic stress conditions, such as drought and heat, adversely affect its survival, growth, and production. The DEHYDRATION-RESPONSIVE ELEMENT-BINDING PROTEIN2 (DREB2) group includes transcription factors that contribute to drought and heat stress tolerance by activating transcription through the cis-element dehydration-responsive element (DRE) in response to these stress stimuli. Two modes of regulation, transcriptional and posttranslational, are important for the activation of gene expression by DREB2A in Arabidopsis (Arabidopsis thaliana). However, the regulatory system of DREB2 in soybean is not clear. We identified a new soybean DREB2 gene, GmDREB2A;2, that was highly induced not only by dehydration and heat but also by low temperature. GmDREB2A;2 exhibited a high transactivation activity via DRE and has a serine/threonine-rich region, which corresponds to a negative regulatory domain of DREB2A that is involved in its posttranslational regulation, including destabilization. Despite the partial similarity between these sequences, the activity and stability of the GmDREB2A;2 protein were enhanced by removal of the serine/threonine-rich region in both Arabidopsis and soybean protoplasts, suggestive of a conserved regulatory mechanism that involves the recognition of serine/threonine-rich sequences with a specific pattern. The heterologous expression of GmDREB2A;2 in Arabidopsis induced DRE-regulated stress-inducible genes and improved stress tolerance. However, there were variations in the growth phenotypes of the transgenic Arabidopsis, the induced genes, and their induction ratios between GmDREB2A;2 and DREB2A. Therefore, the basic function and regulatory machinery of DREB2 have been maintained between Arabidopsis and soybean, although differentiation has also occurred.

  7. Thyroid hormone-regulated gene expression in juvenile mouse liver: identification of thyroid response elements using microarray profiling and in silico analyses

    Directory of Open Access Journals (Sweden)

    Paquette Martin A

    2011-12-01

    Full Text Available Abstract Background Disruption of thyroid hormone signalling can alter growth, development and energy metabolism. Thyroid hormones exert their effects through interactions with thyroid receptors that directly bind thyroid response elements and can alter transcriptional activity of target genes. The effects of short-term thyroid hormone perturbation on hepatic mRNA transcription in juvenile mice were evaluated, with the goal of identifying genes containing active thyroid response elements. Thyroid hormone disruption was induced from postnatal day 12 to 15 by adding goitrogens to dams' drinking water (hypothyroid. A subgroup of thyroid hormone-disrupted pups received intraperitoneal injections of replacement thyroid hormones four hours prior to sacrifice (replacement. An additional group received only thyroid hormones four hours prior to sacrifice (hyperthyroid. Hepatic mRNA was extracted and hybridized to Agilent mouse microarrays. Results Transcriptional profiling enabled the identification of 28 genes that appeared to be under direct thyroid hormone-regulation. The regulatory regions of the genome adjacent to these genes were examined for half-site sequences that resemble known thyroid response elements. A bioinformatics search identified 33 thyroid response elements in the promoter regions of 13 different genes thought to be directly regulated by thyroid hormones. Thyroid response elements found in the promoter regions of Tor1a, 2310003H01Rik, Hect3d and Slc25a45 were further validated by confirming that the thyroid receptor is associated with these sequences in vivo and that it can bind directly to these sequences in vitro. Three different arrangements of thyroid response elements were identified. Some of these thyroid response elements were located far up-stream (> 7 kb of the transcription start site of the regulated gene. Conclusions Transcriptional profiling of thyroid hormone disrupted animals coupled with a novel bioinformatics search

  8. Sequence elements in the human osteocalcin gene confer basal activation and inducible response to hormonal vitamin D sub 3

    Energy Technology Data Exchange (ETDEWEB)

    Kerner, S.A.; Scott, R.A.; Pike, J.W. (Baylor College of Medicine, Houston, TX (USA))

    1989-06-01

    Osteoblast-specific expression of the bone protein osteocalcin is controlled at the transcriptional level by the steroid hormone 1{alpha},25-dihydroxyvitamin D{sub 3}. As this protein may represent a marker for bone activity in human disease, the authors examined the regulation of its expression at the molecular level by evaluating human osteocalcin gene promoter function. They describe regions within the promoter that contribute to basal expression of the gene in osteoblast-like cells in culture. Further, they define a 21-base-pair DNA element with the sequence 5{prime}-GTGACTCACCGGGTGAACGGG-3{prime}, which acts in cis to mediate 1{alpha},25-dihydroxyvitamin D{sub 3} inducibility of the osteocalcin gene. This response element bears sequence similarity with other short DNA segments, particularly those for estrogen and thyroid hormone, which act together with their respective trans-acting receptors to modulate gene transcription.

  9. A highly specific pathogen-responsive promoter element from the immediate-early activated CMPG1 gene in Petroselinum crispum.

    Science.gov (United States)

    Kirsch, C; Logemann, E; Lippok, B; Schmelzer, E; Hahlbrock, K

    2001-04-01

    Within the complex signalling network from pathogen-derived elicitor perception to defense-related gene activation, some immediate-early responding genes may have pivotal roles in downstream transcriptional regulation. We have identified the parsley (Petroselinum crispum) ELI17 gene as a particularly fast-responding gene possessing a new type of W box-containing, elicitor-responsive promoter element, E17. Highly selective E17-mediated reporter gene expression at pathogen infection sites in transgenic Arabidopsis thaliana plants demonstrated the potential of this promoter element for designing new strategies in resistance breeding as well as for further analysis of the early components of defense-related gene activation mechanisms. The protein encoded by the ELI17 gene exhibits various structural characteristics of established transcription factors and is designated as a CMPG protein according to the first four strictly conserved amino acids defining a newly emerging class of plant-specific proteins.

  10. Enrichment of Conserved Synaptic Activity-Responsive Element in Neuronal Genes Predicts a Coordinated Response of MEF2, CREB and SRF

    Science.gov (United States)

    Rodríguez-Tornos, Fernanda M.; San Aniceto, Iñigo; Cubelos, Beatriz; Nieto, Marta

    2013-01-01

    A unique synaptic activity-responsive element (SARE) sequence, composed of the consensus binding sites for SRF, MEF2 and CREB, is necessary for control of transcriptional upregulation of the Arc gene in response to synaptic activity. We hypothesize that this sequence is a broad mechanism that regulates gene expression in response to synaptic activation and during plasticity; and that analysis of SARE-containing genes could identify molecular mechanisms involved in brain disorders. To search for conserved SARE sequences in the mammalian genome, we used the SynoR in silico tool, and found the SARE cluster predominantly in the regulatory regions of genes expressed specifically in the nervous system; most were related to neural development and homeostatic maintenance. Two of these SARE sequences were tested in luciferase assays and proved to promote transcription in response to neuronal activation. Supporting the predictive capacity of our candidate list, up-regulation of several SARE containing genes in response to neuronal activity was validated using external data and also experimentally using primary cortical neurons and quantitative real time RT-PCR. The list of SARE-containing genes includes several linked to mental retardation and cognitive disorders, and is significantly enriched in genes that encode mRNA targeted by FMRP (fragile X mental retardation protein). Our study thus supports the idea that SARE sequences are relevant transcriptional regulatory elements that participate in plasticity. In addition, it offers a comprehensive view of how activity-responsive transcription factors coordinate their actions and increase the selectivity of their targets. Our data suggest that analysis of SARE-containing genes will reveal yet-undescribed pathways of synaptic plasticity and additional candidate genes disrupted in mental disease. PMID:23382855

  11. Enrichment of conserved synaptic activity-responsive element in neuronal genes predicts a coordinated response of MEF2, CREB and SRF.

    Directory of Open Access Journals (Sweden)

    Fernanda M Rodríguez-Tornos

    Full Text Available A unique synaptic activity-responsive element (SARE sequence, composed of the consensus binding sites for SRF, MEF2 and CREB, is necessary for control of transcriptional upregulation of the Arc gene in response to synaptic activity. We hypothesize that this sequence is a broad mechanism that regulates gene expression in response to synaptic activation and during plasticity; and that analysis of SARE-containing genes could identify molecular mechanisms involved in brain disorders. To search for conserved SARE sequences in the mammalian genome, we used the SynoR in silico tool, and found the SARE cluster predominantly in the regulatory regions of genes expressed specifically in the nervous system; most were related to neural development and homeostatic maintenance. Two of these SARE sequences were tested in luciferase assays and proved to promote transcription in response to neuronal activation. Supporting the predictive capacity of our candidate list, up-regulation of several SARE containing genes in response to neuronal activity was validated using external data and also experimentally using primary cortical neurons and quantitative real time RT-PCR. The list of SARE-containing genes includes several linked to mental retardation and cognitive disorders, and is significantly enriched in genes that encode mRNA targeted by FMRP (fragile X mental retardation protein. Our study thus supports the idea that SARE sequences are relevant transcriptional regulatory elements that participate in plasticity. In addition, it offers a comprehensive view of how activity-responsive transcription factors coordinate their actions and increase the selectivity of their targets. Our data suggest that analysis of SARE-containing genes will reveal yet-undescribed pathways of synaptic plasticity and additional candidate genes disrupted in mental disease.

  12. Experimental Validation of Two-dimensional Finite Element Method for Simulating Constitutive Response of Polycrystals During High Temperature Plastic Deformation

    Science.gov (United States)

    Agarwal, Sumit; Briant, Clyde L.; Krajewski, Paul E.; Bower, Allan F.; Taleff, Eric M.

    2007-04-01

    A finite element method was recently designed to model the mechanisms that cause superplastic deformation (A.F. Bower and E. Wininger, A Two-Dimensional Finite Element Method for Simulating the Constitutive Response and Microstructure of Polycrystals during High-Temperature Plastic Deformation, J. Mech. Phys. Solids, 2004, 52, p 1289-1317). The computations idealize the solid as a collection of two-dimensional grains, separated by sharp grain boundaries. The grains may deform plastically by thermally activated dislocation motion, which is modeled using a conventional crystal plasticity law. The solid may also deform by sliding on the grain boundaries, or by stress-driven diffusion of atoms along grain boundaries. The governing equations are solved using a finite element method, which includes a front-tracking procedure to monitor the evolution of the grain boundaries and surfaces in the solid. The goal of this article is to validate these computations by systematically comparing numerical predictions to experimental measurements of the elevated-temperature response of aluminum alloy AA5083 (M.-A. Kulas, W.P. Green, E.M. Taleff, P.E. Krajewski, and T.R. McNelley, Deformation Mechanisms in Superplastic AA5083 materials. Metall. Mater. Trans. A, 2005, 36(5), p 1249-1261). The experimental work revealed that a transition occurs from grain-boundary sliding to dislocation (solute-drag) creep at approximately 0.001/s for temperatures between 425 and 500 °C. In addition, increasing the grain size from 7 to 10 μm decreased the transition to significantly lower strain rates. Predictions from the finite element method accurately predict the effect of grain size on the transition in deformation mechanisms.

  13. Quantitative analysis of polycomb response elements (PREs at identical genomic locations distinguishes contributions of PRE sequence and genomic environment

    Directory of Open Access Journals (Sweden)

    Okulski Helena

    2011-03-01

    Full Text Available Abstract Background Polycomb/Trithorax response elements (PREs are cis-regulatory elements essential for the regulation of several hundred developmentally important genes. However, the precise sequence requirements for PRE function are not fully understood, and it is also unclear whether these elements all function in a similar manner. Drosophila PRE reporter assays typically rely on random integration by P-element insertion, but PREs are extremely sensitive to genomic position. Results We adapted the ΦC31 site-specific integration tool to enable systematic quantitative comparison of PREs and sequence variants at identical genomic locations. In this adaptation, a miniwhite (mw reporter in combination with eye-pigment analysis gives a quantitative readout of PRE function. We compared the Hox PRE Frontabdominal-7 (Fab-7 with a PRE from the vestigial (vg gene at four landing sites. The analysis revealed that the Fab-7 and vg PREs have fundamentally different properties, both in terms of their interaction with the genomic environment at each site and their inherent silencing abilities. Furthermore, we used the ΦC31 tool to examine the effect of deletions and mutations in the vg PRE, identifying a 106 bp region containing a previously predicted motif (GTGT that is essential for silencing. Conclusions This analysis showed that different PREs have quantifiably different properties, and that changes in as few as four base pairs have profound effects on PRE function, thus illustrating the power and sensitivity of ΦC31 site-specific integration as a tool for the rapid and quantitative dissection of elements of PRE design.

  14. Radioprotection of the rat parotid gland by cAMP

    Energy Technology Data Exchange (ETDEWEB)

    Sodicoff, M.; Conger, A.D.

    1983-10-01

    Most earlier studies showing a radioprotective effect by cAMP show only slight degrees of protection. The present study demonstrates a substantial protective effect (DMF, 1.63) of exogenously administered cAMP on the rat parotid gland and supports the mechanism suggested previously for protection afforded the parotid glands by the ..beta..-adrenergic agonist isoproterenol, which is known to elevate endogenous intracellular cAMP.

  15. Expression and purification of full length mouse metal response element binding transcription factor-1 using Pichia pastoris.

    Science.gov (United States)

    Huyck, Ryan W; Keightley, Andrew; Laity, John H

    2012-09-01

    The metal response element binding transcription factor-1 (MTF-1) is an important stress response, heavy metal detoxification, and zinc homeostasis factor in eukaryotic organisms from Drosophila to humans. MTF-1 transcriptional regulation is primarily mediated by elevated levels of labile zinc, which direct MTF-1 to bind the metal response element (MRE). This process involves direct zinc binding to the MTF-1 zinc fingers, and zinc dependent interaction of the MTF-1 acidic region with the p300 coactivator protein. Here, the first recombinant expression system for mutant and wild type (WT) mouse MTF-1 (mMTF-1) suitable for biochemical and biophysical studies in vitro is reported. Using the methyltropic yeast Pichia pastoris, nearly half-milligram recombinant WT and mutant mMTF-1 were produced per liter of P. pastoris cell culture, and purified by a FLAG-tag epitope. Using a first pass ammonium sulfate purification, followed by anti-FLAG affinity resin, mMTF-1 was purified to >95% purity. This recombinant mMTF-1 was then assayed for direct protein-protein interactions with p300 by co-immunoprecipitation. Surface plasmon resonance studies on mMTF-1 provided the first quantitative DNA binding affinity measurements to the MRE promotor element (K(d)=5±3 nM). Both assays demonstrated the functional activity of the recombinant mMTF-1, while elucidating the molecular basis for mMTF-1-p300 functional synergy, and provided new insights into the mMTF-1 domain specific roles in DNA binding. Overall, this production system provides accessibility for the first time to a multitude of in vitro studies using recombinant mutant and WT mMTF-1, which greatly facilitates new approaches to understanding the complex and varied functions of this protein.

  16. Regulation of CYP3A4 by pregnane X receptor: The role of nuclear receptors competing for response element binding

    Energy Technology Data Exchange (ETDEWEB)

    Istrate, Monica A., E-mail: monicai@scripps.edu [Dr. Margarete Fischer-Bosch-Institute of Clinical Pharmacology, Stuttgart, Germany, and University of Tuebingen, Auerbachstr. 112, D-70376 Stuttgart (Germany); Nussler, Andreas K., E-mail: nuessler@uchir.me.tum.de [Department of Traumatology, Technical University Munich, Ismaningerstr. 22, 81675 Munich (Germany); Eichelbaum, Michel, E-mail: michel.eichelbaum@ikp-stuttgart.de [Dr. Margarete Fischer-Bosch-Institute of Clinical Pharmacology, Stuttgart, Germany, and University of Tuebingen, Auerbachstr. 112, D-70376 Stuttgart (Germany); Burk, Oliver, E-mail: oliver.burk@ikp-stuttgart.de [Dr. Margarete Fischer-Bosch-Institute of Clinical Pharmacology, Stuttgart, Germany, and University of Tuebingen, Auerbachstr. 112, D-70376 Stuttgart (Germany)

    2010-03-19

    Induction of the major drug metabolizing enzyme CYP3A4 by xenobiotics contributes to the pronounced interindividual variability of its expression and often results in clinically relevant drug-drug interactions. It is mainly mediated by PXR, which regulates CYP3A4 expression by binding to several specific elements in the 5' upstream regulatory region of the gene. Induction itself shows a marked interindividual variability, whose underlying determinants are only partly understood. In this study, we investigated the role of nuclear receptor binding to PXR response elements in CYP3A4, as a potential non-genetic mechanism contributing to interindividual variability of induction. By in vitro DNA binding experiments, we showed that several nuclear receptors bind efficiently to the proximal promoter ER6 and distal xenobiotic-responsive enhancer module DR3 motifs. TR{alpha}1, TR{beta}1, COUP-TFI, and COUP-TFII further demonstrated dose-dependent repression of PXR-mediated CYP3A4 enhancer/promoter reporter activity in transient transfection in the presence and absence of the PXR inducer rifampin, while VDR showed this effect only in the absence of treatment. By combining functional in vitro characterization with hepatic expression analysis, we predict that TR{alpha}1, TR{beta}1, COUP-TFI, and COUP-TFII show a strong potential for the repression of PXR-mediated activation of CYP3A4 in vivo. In summary, our results demonstrate that nuclear receptor binding to PXR response elements interferes with PXR-mediated expression and induction of CYP3A4 and thereby contributes to the interindividual variability of induction.

  17. Non-linear finite element analysis for prediction of seismic response of buildings considering soil-structure interaction

    Directory of Open Access Journals (Sweden)

    E. Çelebi

    2012-11-01

    Full Text Available The objective of this paper focuses primarily on the numerical approach based on two-dimensional (2-D finite element method for analysis of the seismic response of infinite soil-structure interaction (SSI system. This study is performed by a series of different scenarios that involved comprehensive parametric analyses including the effects of realistic material properties of the underlying soil on the structural response quantities. Viscous artificial boundaries, simulating the process of wave transmission along the truncated interface of the semi-infinite space, are adopted in the non-linear finite element formulation in the time domain along with Newmark's integration. The slenderness ratio of the superstructure and the local soil conditions as well as the characteristics of input excitations are important parameters for the numerical simulation in this research. The mechanical behavior of the underlying soil medium considered in this prediction model is simulated by an undrained elasto-plastic Mohr-Coulomb model under plane-strain conditions. To emphasize the important findings of this type of problems to civil engineers, systematic calculations with different controlling parameters are accomplished to evaluate directly the structural response of the vibrating soil-structure system. When the underlying soil becomes stiffer, the frequency content of the seismic motion has a major role in altering the seismic response. The sudden increase of the dynamic response is more pronounced for resonance case, when the frequency content of the seismic ground motion is close to that of the SSI system. The SSI effects under different seismic inputs are different for all considered soil conditions and structural types.

  18. Minocycline upregulates cyclic AMP response element binding protein and brain-derived neurotrophic factor in the hippocampus of cerebral ischemia rats and improves behavioral deficits

    Directory of Open Access Journals (Sweden)

    Zhao Y

    2015-02-01

    Full Text Available Yu Zhao,1 Ming Xiao,2 Wenbo He,3 Zhiyou Cai3 1Department of Neurology, the Fourth Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, People’s Republic of China; 2Department of Anatomy, Nanjing Medical University, Nanjing, Jiangsu, People’s Republic of China; 3Department of Neurology, Renmin Hospital, Hubei University of Medicine, Shiyan Renmin Hospital, Shiyan, Hubei Province, People’s Republic of China Background and purpose: The cAMP response element binding protein (CREB plays an important role in the mechanism of cognitive impairment and is also pivotal in the switch from short-term to long-term memory. Brain-derived neurotrophic factor (BDNF seems a promising avenue in the treatment of cerebral ischemia injury since this neurotrophin could stimulate structural plasticity and repair cognitive impairment. Several findings have displayed that the dysregulation of the CREB–BDNF cascade has been involved in cognitive impairment. The aim of this study was to investigate the effect of cerebral ischemia on learning and memory as well as on the levels of CREB, phosphorylated CREB (pCREB, and BDNF, and to determine the effect of minocycline on CREB, pCREB, BDNF, and behavioral functional recovery after cerebral ischemia. Methods: The animal model was established by permanent bilateral occlusion of both common carotid arteries. Behavior was evaluated 5 days before decapitation with Morris water maze and open-field task. Four days after permanent bilateral occlusion of both common carotid arteries, minocycline was administered by douche via the stomach for 4 weeks. CREB and pCREB were examined by Western blotting, reverse transcription polymerase chain reaction, and immunohistochemistry. BDNF was measured by immunohistochemistry and Western blotting. Results: The model rats after minocycline treatment swam shorter distances than control rats before finding the platform (P=0.0007. The number of times the

  19. Adventure Code Camp: Library Mobile Design in the Backcountry

    Directory of Open Access Journals (Sweden)

    David Ward

    2014-09-01

    Full Text Available This article presents a case study exploring the use of a student Coding Camp as a bottom-up mobile design process to generate library mobile apps. A code camp sources student programmer talent and ideas for designing software services and features.  This case study reviews process, outcomes, and next steps in mobile web app coding camps. It concludes by offering implications for services design beyond the local camp presented in this study. By understanding how patrons expect to integrate library services and resources into their use of mobile devices, librarians can better design the user experience for this environment.

  20. A Bioinformatics Method for the Design of Live Attenuated Virus Vaccine Utilizing Host MicroRNA Response Elements.

    Science.gov (United States)

    Wichadakul, Duangdao

    2016-01-01

    The host microRNA machinery has been employed to control viral replication. To improve safety for live attenuated virus vaccines, the binding sites of the host microRNAs, so-called microRNA response elements (MREs), were incorporated into the virus sequences. These MREs were typically designed for a specific host microRNA and virus sequence with the effectiveness evaluated by experimental trials. Here, we describe a computational flow that can be used to simultaneously design and prioritize the effective MREs in large-scale.

  1. Effects of diazepam on orthodontic tooth movement and alveolar bone cAMP levels in cats.

    Science.gov (United States)

    Burrow, S J; Sammon, P J; Tuncay, O C

    1986-08-01

    Cyclic AMP has been suggested as a possible intracellular mediator in bone remodeling during tooth movement. Accordingly, an increase in the level of this nucleotide should result in faster tooth movement. Breakdown of cAMP was inhibited by administration of diazepam in eight cats undergoing orthodontic tooth movement; another matched group of eight animals served as controls. Orthodontic appliances consisted of coil springs stretching between the right side maxillary and mandibular canines and third premolars. The data for tooth movement and cAMP concentrations were analyzed by repeated measures factorial analyses of variance. The results indicated that administration of diazepam increased the rate of tooth movement at P less than 0.0005 and, interestingly, although diazepam had no effect on undisturbed tissues, it lowered the cAMP levels in the periodontal tissues of orthodontically moved teeth at P less than 0.01. On the basis of these results, it was concluded that the concentration of cAMP did not correlate with bone remodeling in this model and perhaps should not be used as an index of periodontal-tissue response during orthodontic tooth movement.

  2. Diatom acclimation to elevated CO2 via cAMP signalling and coordinated gene expression

    Science.gov (United States)

    Hennon, Gwenn M. M.; Ashworth, Justin; Groussman, Ryan D.; Berthiaume, Chris; Morales, Rhonda L.; Baliga, Nitin S.; Orellana, Mónica V.; Armbrust, E. V.

    2015-08-01

    Diatoms are responsible for ~40% of marine primary productivity, fuelling the oceanic carbon cycle and contributing to natural carbon sequestration in the deep ocean. Diatoms rely on energetically expensive carbon concentrating mechanisms (CCMs) to fix carbon efficiently at modern levels of CO2 (refs , , ). How diatoms may respond over the short and long term to rising atmospheric CO2 remains an open question. Here we use nitrate-limited chemostats to show that the model diatom Thalassiosira pseudonana rapidly responds to increasing CO2 by differentially expressing gene clusters that regulate transcription and chromosome folding, and subsequently reduces transcription of photosynthesis and respiration gene clusters under steady-state elevated CO2. These results suggest that exposure to elevated CO2 first causes a shift in regulation, and then a metabolic rearrangement. Genes in one CO2-responsive cluster included CCM and photorespiration genes that share a putative cAMP-responsive cis-regulatory sequence, implying these genes are co-regulated in response to CO2, with cAMP as an intermediate messenger. We verified cAMP-induced downregulation of CCM gene δ-CA3 in nutrient-replete diatom cultures by inhibiting the hydrolysis of cAMP. These results indicate an important role for cAMP in downregulating CCM and photorespiration genes under elevated CO2 and provide insights into mechanisms of diatom acclimation in response to climate change.

  3. Microbial Response to the Application of Amendments in a Contaminated Soil with Trace Elements

    Directory of Open Access Journals (Sweden)

    A. Branzini

    2009-01-01

    Full Text Available Problem Statement: The anthropogenic activities can cause adverse effects in soils, increasing in some situations trace elements contents, impacting negatively both the microbial biomass and activity. Among the practices used for the recovery of soil quality we can find the application of organic amendments or the product of their composting. These can adsorb trace elements decreasing their availability and increasing the soil microbial biomass. The microorganisms of the soil use to be considered as sensitive biological indicators of the changes produced in the soil quality. Approach: One processes to quantify soil biological activity is the respiration. The aim was to evaluate the effects of two organic amendments application on soil microbial activity, in a soil contaminated with copper (Cu, zinc (Zn and chromium (Cr. To prove the raised aim we quantified CO2-C release. Results: The results showed that at the end of the incubation period, as much in contaminated soils as in soils without contamination, the total activity of microorganisms was significantly increased by the application of organic amendments (p = 0.0062 and p = 0.0005, respectively. The application of both composts to slightly acid soils increased the initial and final values of pH. There was no evidence of modification in Electrical Conductivity (EC because of compost application. At the end of the incubation period a negative relationship was observed between EC and CO2-C (R2 = 0.74, p = 0.0028. Conclusions: The obtained results in this study suggested that it was possible to increase the total activity of soil microorganisms and to reduce the bioavailability of Cu, Cr and Zn in a contaminated soil. As a result, CO2-C release is a sensitive index of the soil quality, at least in the experimental conditions of this essay.

  4. Characterization of a proximal Sp1 response element in the mouse Dlk2 gene promoter

    Directory of Open Access Journals (Sweden)

    Rivero Samuel

    2011-12-01

    Full Text Available Abstract Background DLK2 is an EGF-like membrane protein, closely related to DLK1, which is involved in adipogenesis. Both proteins interact with the NOTCH1 receptor and are able to modulate its activation. The expression of the gene Dlk2 is coordinated with that of Dlk1 in several tissues and cell lines. Unlike Dlk1, the mouse Dlk2 gene and its locus at chromosome 17 are not fully characterized. Results The goal of this work was the characterization of Dlk2 mRNA, as well as the analysis of the mechanisms that control its basal transcription. First, we analyzed the Dlk2 transcripts expressed by several mouse cells lines and tissues, and mapped the transcription start site by 5' Rapid Amplification of cDNA Ends. In silico analysis revealed that Dlk2 possesses a TATA-less promoter containing minimal promoter elements associated with a CpG island, and sequences for Inr and DPE elements. Besides, it possesses six GC-boxes, considered as consensus sites for the transcription factor Sp1. Indeed, we report that Sp1 directly binds to the Dlk2 promoter, activates its transcription, and regulates its level of expression. Conclusions Our results provide the first characterization of Dlk2 transcripts, map the location of the Dlk2 core promoter, and show the role of Sp1 as a key regulator of Dlk2 transcription, providing new insights into the molecular mechanisms that contribute to the expression of the Dlk2 gene.

  5. Camp Insurance 101: Understanding the Fundamentals of a Camp Insurance Program.

    Science.gov (United States)

    Garner, Ian

    2001-01-01

    This short course on insurance for camps discusses coverage, including the various types of liability, property, and other types of coverage; the difference between direct writers, brokers, agents, and captive agents; choosing an insurance company; and checking on the financial stability of recommended carriers. Three Web sites are given for…

  6. Staphylococcus pseudintermedius for CAMP-test.

    Science.gov (United States)

    Savini, Vincenzo; Paparella, Antonello; Serio, Annalisa; Marrollo, Roberta; Carretto, Edoardo; Fazii, Paolo

    2014-01-01

    CAMP test reliably detects Listeria monocytogenes (Lm) and Streptococcus agalactiae (group B streptococcus, GBS); it is traditionally performed streaking the tested isolate perpendicularly to Staphylococcus aureus (Sa), provided that reference Sa strains (that produce β-hemolysin) are used. In a zone of β-hemolysin activity, in fact, GBS and Lm form typical arrow-shaped hemolytic areas. While Sa production of the toxin is strain-dependent, however, that of Staphylococcus pseudintermedius (Sp), a pet-owner colonizer and an emerging human pathogen, is constitutive, then observed in all clinical isolates. Therefore, Sp may indeed represent a valid alternative to perform the assay.

  7. Investigation of mechanical responses to the tactile perception of surfaces with different textures using the finite element method

    Directory of Open Access Journals (Sweden)

    Wei Tang

    2016-07-01

    Full Text Available Tactile perception is essential for humans to perceive the world, and it usually results in mechanical responses from the finger. In this study, a nonlinear, viscoelastic, and multilayered finite element model of the finger was developed. The relationship between the mechanical responses within the finger and tactile perception while the finger scanned different surface textures was studied. The results showed that the sensitivity of tactile perception is affected by the peak value of von Mises stress, which is itself determined by the shape and density of a given texture. The von Mises stress varies periodically with time, and this variation depends on the periodicity of the texture. Displacement signals around Pacinian corpuscles have periodic variation. The period of displacement decreases as the density of the texture increases. The spectral centroid increases as the spacing of the texture decreases. The related mechanisms are discussed in this article.

  8. Elements That Regulate the DNA Damage Response of Proteins Defective in Cockayne Syndrome.

    Science.gov (United States)

    Iyama, Teruaki; Wilson, David M

    2016-01-16

    Cockayne syndrome (CS) is a premature aging disorder characterized by developmental defects, multisystem progressive degeneration and sensitivity to ultraviolet light. CS is divided into two primary complementation groups, A and B, with the CSA and CSB proteins presumably functioning in DNA repair and transcription. Using laser microirradiation and confocal microscopy, we characterized the nature and regulation of the CS protein response to oxidative DNA damage, double-strand breaks (DSBs), angelicin monoadducts and trioxsalen interstrand crosslinks (ICLs). Our data indicate that CSB recruitment is influenced by the type of DNA damage and is most rapid and robust as follows: ICLs>DSBs>monoadducts>oxidative lesions. Transcription inhibition reduced accumulation of CSB at sites of monoadducts and ICLs, but it did not affect recruitment to (although slightly affected retention at) oxidative damage. Inhibition of histone deacetylation altered the dynamics of CSB assembly, suggesting a role for chromatin status in the response to DNA damage, whereas the proteasome inhibitor MG132 had no effect. The C-terminus of CSB and, in particular, its ubiquitin-binding domain were critical to recruitment, while the N-terminus and a functional ATPase domain played a minor role at best in facilitating protein accumulation. Although the absence of CSA had no effect on CSB recruitment, CSA itself localized at sites of ICLs, DSBs and monoadducts but not at oxidative lesions. Our results reveal molecular components of the CS protein response and point to a major involvement of complex lesions in the pathology of CS.

  9. Structural Responses and Finite Element Modeling of Hakka Tulou Rammed Earth Structures

    Science.gov (United States)

    Sranislawski, Daniel

    Hakka Tulous are rammed earth structures that have survived the effects of aging and natural elements upwards of even over a thousand years. These structures have housed the Hakka people of the Fujian Province, China in natural yet modern housing that has provided benefits over newer building materials. The key building material, rammed earth, which is used for the walls of the Hakka Tulou structures, has provided structural stability along with thermal comfort to the respective inhabitants of the Hakka Tulous. Through material testing and analysis this study has examined how the Tulou structures have maintained their structural stability while also providing thermal comfort. Reports of self healing cracks in the rammed earth walls were also analyzed for their validity in this study. The study has found that although the story of the self healing crack cannot be validated, there is reason to believe that with the existence of lime, some type of autogenous healing could occur on a small scale. The study has also found, through the use of nondestructive testing, that both the internal wooden systems (flooring, roof, and column support) and the rammed earth walls, are still structurally sound. Also, rammed earth's high thermal mass along with the use of sufficient shading has allowed for a delay release of heat energy from the walls of the Tulous, thus providing thermal comfort that can be felt during both night and day temperatures. The Hakka Tulou structures have been found to resist destruction from natural disasters such as strong earthquakes even when more modern construction has not. Through finite element modeling, this study has shown that the high volume of rammed earth used in the construction of the Hakka Tulous helps dissipate lateral force energy into much lower stresses for the rammed earth wall. This absorption of lateral force energy allows the rammed earth structures to survive even the strongest of earthquakes experienced in the region. The Hakka

  10. Mitral valve finite element modeling: implications of tissues' nonlinear response and annular motion.

    Science.gov (United States)

    Stevanella, Marco; Votta, Emiliano; Redaelli, Alberto

    2009-12-01

    Finite element modeling represents an established method for the comprehension of the mitral function and for the simulation of interesting clinical scenarios. However, current models still do not include all the key aspects of the real system. We implemented a new structural finite element model that considers (i) an accurate morphological description of the valve, (ii) a description of the tissues' mechanical properties that accounts for anisotropy and nonlinearity, and (iii) dynamic boundary conditions that mimic annulus and papillary muscles' contraction. The influence of such contraction on valve biomechanics was assessed by comparing the computed results with the ones obtained through an auxiliary model with fixed annulus and papillary muscles. At the systolic peak, the leaflets' maximum principal stress contour showed peak values in the anterior leaflet at the strut chordae insertion zone (300 kPa) and near the annulus (200-250 kPa), while much lower values were detected in the posterior leaflet. Both leaflets underwent larger tensile strains in the longitudinal direction, while in the circumferential one the anterior leaflet experienced nominal tensile strains up to 18% and the posterior one experienced compressive strains up to 23% associated with the folding of commissures and paracommissures, consistently with tissue redundancy. The force exerted by papillary muscles at the systolic peak was equal to 4.11 N, mainly borne by marginal chordae (76% of the force). Local reaction forces up to 45 mN were calculated on the annulus, leading to tensions of 89 N/m and 54 N/m for its anterior and posterior tracts, respectively. The comparison with the results of the auxiliary model showed that annular contraction mainly affects the leaflets' circumferential strains. When it was suppressed, no more compressive strains could be observed and peak strain values were located in the belly of the anterior leaflet. Computational results agree to a great extent with

  11. Micoses superficiais e os elementos da resposta imune Superficial mycosis and the immune response elements

    Directory of Open Access Journals (Sweden)

    Paulo Ricardo Criado

    2011-08-01

    Full Text Available As micoses superficiais são prevalentes em todo o mundo, geralmente ocasionadas por dermatófitos e restritas à camada córnea. A resposta imunológica do hospedeiro às infecções dos fungos dermatófitos depende basicamente das defesas do hospedeiro a metabólitos do fungo, da virulência da cepa ou da espécie infectante e da localização anatômica da infecção. Serão revistos alguns dos fatores da defesa imunológica do hospedeiro que influenciam na eficácia da resposta imune. Em especial, a participação dos receptores de padrão de reconhecimento (PRRs, tais como os receptores toll-like ou os da família lectina (DC-SIGN e dectin-2, que participam da resposta imune inata, conferindo-lhe especificidade e definindo o padrão da resposta imune como um todo. O predomínio celular ou humoral da resposta imune definirá o quadro clínico e o prognóstico da infecção, levando à cura ou cronicidadeSuperficial mycoses are prevalent worldwide. They are often caused by dermatophytes and restricted to the stratum corneum. The host's immune response against infections caused by dermatophytes basically depends on the host's defense against metabolites of the fungi, virulence of the infecting strain or species and anatomical site of the infection. We will review some of the factors of the host's immune defense that influence the efficacy of the immune response. We will particularly review the role of pattern recognition receptors (PRRs, such as toll-like receptors or lectin receptors (DCSIGN and Dectin 2, which participate in the innate immune response, bringing specificity to the immune response and setting its pattern. The predominance of a cellular or humoral immune response determines the clinical manifestations and the prognosis of the infection, leading to healing or chronicity

  12. Element Cycling and Energy Flux Responses in Ecosystem Simulations Conducted at the Chinese Lunar Palace-1

    Science.gov (United States)

    Dong, Chen; Fu, Yuming; Xie, Beizhen; Wang, Minjuan; Liu, Hong

    2017-01-01

    Bioregenerative life-support systems (BLSS) address interactions between organisms and their environment as an integrated system through the study of factors that regulate the pools and fluxes of materials and energy through ecological systems. As a simple model, using BLSS is very important in the investigation of element cycling and energy flux for sustainable development on Earth. A 105-day experiment with a high degree of closure was carried out in this system from February to May, 2014, with three volunteers. The results indicate that 247 g·d-1 carbon was imported into the system from stored food. Most hydrogen is circulated as water, and more than 99% H2O can be lost through leaf transpiration into the atmosphere. A total of 1.8 g·d-1 "unknown oxygen" emerged between the input and output of the plant growth module. For the urine processing module, 20.5% nitrogen was reused and 5.35 g·d-1 was put into the nutrient solution.

  13. Explicit incremental-update algorithm for modeling crystal elasto-viscoplastic response in finite element simulation

    Institute of Scientific and Technical Information of China (English)

    LI Hong-wei; YANG He; SUN Zhi-chao

    2006-01-01

    Computational stability and efficiency are the key problems for numerical modeling of crystal plasticity,which will limit its development and application in finite element (FE) simulation evidently. Since implicit iterative algorithms are inefficient and have difficulty to determine initial values,an explicit incremental-update algorithm for the elasto-viscoplastic constitutive relation was developed in the intermediate frame by using the second Piola-Kirchoff (P-K) stress and Green stain. The increment of stress and slip resistance were solved by a calculation loop of linear equations sets. The reorientation of the crystal as well as the elastic strain can be obtained from a polar decomposition of the elastic deformation gradient. User material subroutine VUMAT was developed to combine crystal elasto-viscoplastic constitutive model with ABAQUS/Explicit. Numerical studies were performed on a cubic upset model with OFHC material (FCC crystal). The comparison of the numerical results with those obtained by implicit iterative algorithm and those from experiments demonstrates that the explicit algorithm is reliable. Furthermore,the effect rules of material anisotropy,rate sensitivity coefficient (RSC) and loading speeds on the deformation were studied. The numerical studies indicate that the explicit algorithm is suitable and efficient for large deformation analyses where anisotropy due to texture is important.

  14. Identification of Regulatory Mutations in SERPINC1 Affecting Vitamin D Response Elements Associated with Antithrombin Deficiency

    Science.gov (United States)

    Toderici, Mara; de la Morena-Barrio, María Eugenia; Padilla, José; Miñano, Antonia; Antón, Ana Isabel; Iniesta, Juan Antonio; Herranz, María Teresa; Fernández, Nuria; Vicente, Vicente; Corral, Javier

    2016-01-01

    Antithrombin is a crucial anticoagulant serpin whose even moderate deficiency significantly increases the risk of thrombosis. Most cases with antithrombin deficiency carried genetic defects affecting exons or flanking regions of SERPINC1.We aimed to identify regulatory mutations inSERPINC1 through sequencing the promoter, intron 1 and 2 of this gene in 23 patients with antithrombin deficiency but without known genetic defects. Three cases with moderate antithrombin deficiency (63–78%) carried potential regulatory mutations. One located 200 bp before the initiation ATG and two in intron 1. These mutations disrupted two out of five potential vitamin D receptor elements (VDRE) identified in SERPINC1 with different software. One genetic defect, c.42-1060_-1057dupTTGA, was a new low prevalent polymorphism (MAF: 0.01) with functional consequences on plasma antithrombin levels. The relevance of the vitamin D pathway on the regulation of SERPINC1 was confirmed in a cell model. Incubation of HepG2 with paricalcitol, a vitamin D analog, increased dose-dependently the levels of SERPINC1transcripts and antithrombin released to the conditioned medium. This study shows further evidence of the transcriptional regulation of SERPINC1 by vitamin D and first describes the functional and pathological relevance of mutations affecting VDRE of this gene. Our study opens new perspectives in the search of new genetic defects involved in antithrombin deficiency and the risk of thrombosis as well as in the design of new antithrombotic treatments. PMID:27003919

  15. Evaluation of Head Response to Blast Using Sagittal and Transverse Finite Element Head Models

    Science.gov (United States)

    2012-09-01

    scenario nce in results s and the air layer of nod ration caused b ssue Material priate constitu al parameters yperelastic ma curves at diff s were...viscous material model with bulk properties similar to those of water (Table 2). The viscosity was set to that of water , providing minimal resistance...expected odel predicte ere not include ssue by the nu response in th he brain in th ive parameter imum effectiv in rates did no odel predicte el. at 4 m

  16. Two estrogen response element sequences near the PCNA gene are not responsible for its estrogen-enhanced expression in MCF7 cells.

    Directory of Open Access Journals (Sweden)

    Cheng Wang

    Full Text Available BACKGROUND: The proliferating cell nuclear antigen (PCNA is an essential component of DNA replication, cell cycle regulation, and epigenetic inheritance. High expression of PCNA is associated with poor prognosis in patients with breast cancer. The 5'-region of the PCNA gene contains two computationally-detected estrogen response element (ERE sequences, one of which is evolutionarily conserved. Both of these sequences are of undocumented cis-regulatory function. We recently demonstrated that estradiol (E2 enhances PCNA mRNA expression in MCF7 breast cancer cells. MCF7 cells proliferate in response to E2. METHODOLOGY/PRINCIPAL FINDINGS: Here, we demonstrate that E2 rapidly enhanced PCNA mRNA and protein expression in a process that requires ERalpha as well as de novo protein synthesis. One of the two upstream ERE sequences was specifically bound by ERalpha-containing protein complexes, in vitro, in gel shift analysis. Yet, each ERE sequence, when cloned as a single copy, or when engineered as two tandem copies of the ERE-containing sequence, was not capable of activating a luciferase reporter construct in response to E2. In MCF7 cells, neither ERE-containing genomic region demonstrated E2-dependent recruitment of ERalpha by sensitive ChIP-PCR assays. CONCLUSION/SIGNIFICANCE: We conclude that E2 enhances PCNA gene expression by an indirect process and that computational detection of EREs, even when evolutionarily conserved and when near E2-responsive genes, requires biochemical validation.

  17. How to Respond to Problem Behavior in Camp.

    Science.gov (United States)

    Rotman, Charles B.

    1987-01-01

    Deals with types of behavior that cannot be allowed among staff or campers in the camp community--use of drugs or alcohol, personal abuse, crime, violence, and sexual activity. Urges camp directors to develop a written policy spelling out standards, expectations, and sanctions. Suggests staff orientation strategies. (JHZ)

  18. Socialization of Adolescents: Cultural Practices in Children's Summer Camp

    Science.gov (United States)

    Demakova, Irina D.; Valeeva, Roza A.; Shipova, Alina V.

    2016-01-01

    The article describes the relevant aspects of the adolescents' cultural practices in children's summer camp, taking into account their specific characteristics. The summer camp is considered as an educational formation and holistic socio-pedagogical body, designed to create conditions for the development of the person. The criteria for inclusion…

  19. Students Become Scientists at Science Skills Boot Camp | Poster

    Science.gov (United States)

    At the 2016 Science Skills Boot Camp (SSBC), a one-day training program designed for NIH summer interns with little or no prior research experience, students gathered to learn about basic research and laboratory skills. The boot camp provided a unique opportunity for interns to expand their knowledge of simple bench techniques, scientific papers, and ways to communicate their research.

  20. EduCamp Colombia: Social Networked Learning for Teacher Training

    Science.gov (United States)

    Fonseca, Diego Ernesto Leal

    2011-01-01

    This paper describes a learning experience called EduCamp, which was launched by the Ministry of Education of Colombia in 2007, based on emerging concepts such as e-Learning 2.0, connectivism, and personal learning environments. An EduCamp proposes an unstructured collective learning experience, which intends to make palpable the possibilities of…

  1. College and University Summer Camps: Creative Alternatives to Day Care.

    Science.gov (United States)

    Wever, Matthew F.

    1995-01-01

    The successful summer day camp program of Saint Louis University (Missouri) is described. Program rationale, philosophy, objectives, structure, staffing, activities, and benefits to the university community are discussed. A majority of the children served by the camp are the children, ages 6 to 12, of university employees. (MSE)

  2. Specialized Summer Camps: Provide Benefits for Children and Families Alike

    Science.gov (United States)

    Neff, John M.

    2009-01-01

    The arrival of summer signals a season of endless days of swimming, fishing, summer camps, and other outdoor activities. For children with chronic or terminal illnesses, it can be difficult to participate in many of these activities as well as challenging for parents to find summer camps that not only engage their children, but also offer the…

  3. Art Matters: The Creative Side of the Summer Camp Experience.

    Science.gov (United States)

    Foster, Eden

    2003-01-01

    In western North Carolina, 24 summer camps, business leaders, and a local community arts council collaborated on a project celebrating the visual and performing arts created by campers. Campers' art in every media was displayed in Hendersonville to highlight the benefits of summer camps to the community, including their economic, educational,…

  4. Residential Grief Camps: An Initial Phenomenological Study of Staff Perspectives

    Science.gov (United States)

    Brown, Tiffany B.; Kimball, Thomas G.

    2012-01-01

    Research has focused primarily on the impact of death on family functioning and the stages and tasks of grief, though little attention has been given to grief camps or the experiences of those who work there. This study explored the experiences of staff at a four-day overnight children's grief camp. Eight participants reported their experience of…

  5. Novel cAMP targets in cell proliferation

    NARCIS (Netherlands)

    Kuiperij, Hinke Bertha

    2004-01-01

    cAMP is a second messenger that plays a role in a wide variety of biological processes, one of which is the regulation of cell proliferation. Adenylate cyclases generate cAMP in the cell upon activation, followed by binding to and activation of its direct targets, PKA and Epac. PKA is a protein kina

  6. Creating a Healthy Camp Community: A Nurse's Role.

    Science.gov (United States)

    Lishner, Kris Miller; Bruya, Margaret Auld

    This book provides an organized, systematic overview of the basic aspects of health program management, nursing practice, and human relations issues in camp nursing. A foremost assumption is that health care in most camps needs improvement. Good health is dependent upon interventions involving social, environmental, and lifestyle factors that…

  7. The Dynamic Response of an Euler-Bernoulli Beam on an Elastic Foundation by Finite Element Analysis using the Exact Stiffness Matrix

    Science.gov (United States)

    Kim, Jeong Soo; Kyum Kim, Moon

    2012-08-01

    In this study, finite element analysis of beam on elastic foundation, which received great attention of researchers due to its wide applications in engineering, is performed for estimating dynamic responses of shallow foundation using exact stiffness matrix. First, element stiffness matrix based on the closed solution of beam on elastic foundation is derived. Then, we performed static finite element analysis included exact stiffness matrix numerically, comparing results from the analysis with some exact analysis solutions well known for verification. Finally, dynamic finite element analysis is performed for a shallow foundation structure under rectangular pulse loading using trapezoidal method. The dynamic analysis results exist in the reasonable range comparing solution of single degree of freedom problem under a similar condition. The results show that finite element analysis using exact stiffness matrix is evaluated as a good tool of estimating the dynamic response of structures on elastic foundation.

  8. Impact of an informal learning science camp on urban, low socioeconomic status middle school students and participating teacher-leaders

    Science.gov (United States)

    Votaw, Nikki L.

    Studies suggest that students have difficulty connecting science to their own lives (Lee & Fradd, 1998; Aikenhead, 1996). This difficulty results in a decline in students' attitudes toward science, leading to low science achievement. These factors result in fewer students interested in careers related to science, specifically for urban, minority students. The purpose of this study was to examine the impact that a ten day informal learning immersion science camp had on the participants, both urban, low-socioeconomic status middle school students and teacher-leaders. The students were incoming seventh grade students involved in a community-based scholar program designed to recruit and support socioeconomically disadvantaged, academically talented students. The teacher-leaders were professional educators working toward an advanced degree. This ten day camp included seven visits to different sites and complementary classroom-based activities. The purpose of the camp was to immerse the students in informal learning environments that affect their daily lives. Students and teacher-leaders visited facilities that provide public utility services (i.e. power plant, sewage treatment facility, and water company), zoo, large commercial cave system, planetarium, university based electrooptics and nanotechnology center, and forest and arboretum. These site visits were supported by activities that were provided by teacher-leaders. A model used as a framework for studying learning in the context of this ten day camp as Falk and Dierking's (2000) Contextual Model for Learning. This model described three basic intersecting elements that contributed to learning within the given context. The three contexts (personal, sociocultural, and physical) intersect affecting the learning that takes place. A mixed methodology design was employed to determine the impact of the camp on students' content knowledge and attitudes toward science. Qualitative data were collected to determine the impact

  9. Genomic Regulation of the Response of an Agroecosystem to Elements of Global Change

    Energy Technology Data Exchange (ETDEWEB)

    DeLucia, Evan, H.

    2011-06-03

    This document outlines some of the major accomplishments from this project: (1) New tools for analyzing and visualizing microarray data from soybean gene expression experiments; (2) Physiological, biochemical, and gene array evidence that acclimation of carbon metabolism to elevated CO{sub 2} is governed in significant part by changes in gene expression associated with respiratory metabolism; (3) Increased carbon assimilation in soybeans grown at elevated CO{sub 2} altered pools of carbohydrates and transcripts that control growth and expansion of young leaves; (4) Growth at elevated CO{sub 2} increases the abundance of transcripts controlling cell wall polysaccharide synthesis but not transcripts controlling lignin synthesis; (5) The total antioxidant capacity of soybeans varies among cultivars and in response to atmospheric change; (6) Accelerated leaf senescence at elevated O{sub 3} coincides with reduced abundance of transcripts controlling protein synthesis; (7) Growth under elevated CO{sub 2} increases the susceptibility of soybean to insect herbivores by increasing insect lifespan and fecundity through altered leaf chemistry and by defeating molecular induction of plant defenses; (8) Exposure to elevated CO{sub 2} and O{sub 3} alters flavonoid metabolism in soybean; (9) Exposure to elevated CO{sub 2} or O{sub 3} conferred resistance to soybean mosaic virus by cross inducing defense- and stress-related signaling pathways; and (10) Exposure to elevated CO{sub 2} accelerates decomposition by changing chemical and biotic properties of the soil.

  10. Validation of Shoulder Response of Human Body Finite-Element Model (GHBMC) Under Whole Body Lateral Impact Condition.

    Science.gov (United States)

    Park, Gwansik; Kim, Taewung; Panzer, Matthew B; Crandall, Jeff R

    2016-08-01

    In previous shoulder impact studies, the 50th-percentile male GHBMC human body finite-element model was shown to have good biofidelity regarding impact force, but under-predicted shoulder deflection by 80% compared to those observed in the experiment. The goal of this study was to validate the response of the GHBMC M50 model by focusing on three-dimensional shoulder kinematics under a whole-body lateral impact condition. Five modifications, focused on material properties and modeling techniques, were introduced into the model and a supplementary sensitivity analysis was done to determine the influence of each modification to the biomechanical response of the body. The modified model predicted substantially improved shoulder response and peak shoulder deflection within 10% of the observed experimental data, and showed good correlation in the scapula kinematics on sagittal and transverse planes. The improvement in the biofidelity of the shoulder region was mainly due to the modifications of material properties of muscle, the acromioclavicular joint, and the attachment region between the pectoralis major and ribs. Predictions of rib fracture and chest deflection were also improved because of these modifications.

  11. Geogenic and Anthropogenic Moss Responsiveness to Element Distribution Around a Pb-Zn Mine, Toranica, Republic of Macedonia.

    Science.gov (United States)

    Angelovska, Svetlana; Stafilov, Trajče; Šajn, Robert; Balabanova, Biljana

    2016-04-01

    Moss species (Homalothecium lutescens, Hypnum cupressiforme, Brachythecium glareosum, and Campthotecium lutescens) were used as suitable sampling media for biomonitoring the origin of heavy-metal pollution in the lead-zinc (Pb-Zn) mine "Toranica" near the Kriva Palanka town, Eastern Macedonia. The contents of 20 elements-silver (Ag), aluminum (Al), arsenic (As), barium (Ba), calcium (Ca), cadmium (Cd), cobalt (Co), chromium (Cr), copper (Cu), iron (Fe), potassium (K), lithium (Li), magnesium (Mg), manganese (Mn), sodium (Na), nickel (Ni), Pb, strontium (Sr), vanadium (V), and (Zn) were determined by atomic emission spectrometry with inductively coupled plasma. Data processing was applied with combinations of multivariate statistical methods: factor analysis, principal component analysis, and cluster analysis. Moss' responsiveness to the atmospheric distribution of the selected elements was investigated in correlation to the specific geology of the region (soil dusting). Lithogenic distribution was characterized with the distribution of three dominant geochemical associations: F1: Al-Li-V-Cr-Ni-Co, F2: Ba-Ca-Sr, and F3: Cd-Zn-Pb-Cu. Spatial distribution was constructed for visualization of the factor deposition. Furthermore, air distribution (passive biomonitoring) versus soil geochemistry of the analyzed elements was examined. Significant correlations were singled out for Pb, Zn, and Cd and for Mg(moss)/Na(soil). Characteristic lithological anomaly characterized the presence of the oldest geological volcanic rocks. Zone 1 (Pb-Zn mine surrounding) presents a unique area with hydrothermal action of Pb-Zn mineralization leading to polymetallic enrichments in soil. This phenomenon strongly affects the environment, which is a natural geochemical imprint in this unique area (described with the strong dominance of the geochemical association Cd-Zn-Pb-Cu).

  12. Growth responses of selected freshwater algae to trace elements and scrubber ash slurry generated by coal-fired power plants

    Energy Technology Data Exchange (ETDEWEB)

    Vocke, R.W.

    1979-01-01

    The development and implementation of standard toxicity tests is a necessity if consistent and reliable data are to be obtained for water quality criteria. The adapted EPA AAPBT is an ideal static algal toxicity test system. The algal test medium has a chemical composition similar to natural unpolluted waters of low ionic strength. It is appropriate to use MATC water quality criteria when assessing the potential impact of pollutants generated by coal-fired power stations because these energy-generated pollutants typically enter aquatic systems in small quantities over long periods. The MATC water quality criteria are estimates of trace element and SASE levels, based on the most sensitive alga investigated, that will not cause significant changes in naturally-functioning algal populations. These levels are 0.016f mg L/sup -1/ As(V), 0.001 mg L/sup -1/ Cd(II), 0.004 mg L/sup -1/ Hg(II), 0.006 mg L/sup -1/ Se(VI), and 0.344% SASE. To provide viable working water quality criteria, an extrapolation from the laboratory to the natural environment must be made. Therefore, those oxidation states of the trace elements were selected which are the dominant states occurring in natural, unpolluted, slightly alkaline freshwaters. It must be pointed out that these MATC values are based on algal responses to single toxicants and no allowance is made for synergistic, additive, or antagonistic relationships which could occur in natural aquatic systems. Additionally, natural chelation may influence toxicity. The highly toxic nature of potential pollutants from coal-fired generating plants emphasizes the need for minimizing stack effluent pollutants and retaining scrubber ash slurry for proper disposal in an effort to maintain trace elements in concentration ranges compatible with naturally-functioning ecosystems.

  13. Refinement of the androgen response element based on ChIP-Seq in androgen-insensitive and androgen-responsive prostate cancer cell lines.

    Science.gov (United States)

    Wilson, Stephen; Qi, Jianfei; Filipp, Fabian V

    2016-09-14

    Sequence motifs are short, recurring patterns in DNA that can mediate sequence-specific binding for proteins such as transcription factors or DNA modifying enzymes. The androgen response element (ARE) is a palindromic, dihexameric motif present in promoters or enhancers of genes targeted by the androgen receptor (AR). Using chromatin immunoprecipitation sequencing (ChIP-Seq) we refined AR-binding and AREs at a genome-scale in androgen-insensitive and androgen-responsive prostate cancer cell lines. Model-based searches identified more than 120,000 ChIP-Seq motifs allowing for expansion and refinement of the ARE. We classified AREs according to their degeneracy and their transcriptional involvement. Additionally, we quantified ARE utilization in response to somatic copy number amplifications, AR splice-variants, and steroid treatment. Although imperfect AREs make up 99.9% of the motifs, the degree of degeneracy correlates negatively with validated transcriptional outcome. Weaker AREs, particularly ARE half sites, benefit from neighboring motifs or cooperating transcription factors in regulating gene expression. Taken together, ARE full sites generate a reliable transcriptional outcome in AR positive cells, despite their low genome-wide abundance. In contrast, the transcriptional influence of ARE half sites can be modulated by cooperating factors.

  14. Investigation of Micro-mechanical Response of Asphalt Mixtures by a Three-dimensional Discrete Element Model

    Institute of Scientific and Technical Information of China (English)

    HOU Shuguang; ZHANG Dong; HUANG Xiaoming; ZHAO Yongli

    2015-01-01

    The micro-mechanical response of asphalt mixtures was studied using the discrete element method. The discrete element sample of stone mastic asphalt was generated first and the vehicle load was applied to the sample. A user-written program was coded with the FISH language in PFC3D to extract the contact forces within the sample and the displacements of the particles. Then, the contact forces within the whole sample, in asphalt mastic, in coarse aggregates and between asphalt mastic and coarse aggregates were investigated. Finally, the movement of the particles in the sample was analyzed. The sample was divided into 15 areas and a figure was drawn to show how the balls move in each area according to the displacements of the balls in each area. The displacements of asphalt mastic balls and coarse aggregates were also analyzed. The experimental results explain how the asphalt mixture bears vehicle load and the potential reasons why the rutting forms from a micro-mechanical view.

  15. CLONING AND CHARACTERIZATION OF A METAL RESPONSIVE ELEMENT-CONTAINING FRAGMENT FROM THE WILSON DISEASE GENE LOCUS BY JUNCTION TRAPPING

    Institute of Scientific and Technical Information of China (English)

    谢久永; 刘国仰; 王梅; 黄尚志; 罗会元

    1998-01-01

    All mammalian metallothionaln genes studied to dare have several metal responsive elements (MRE) with consensus sequences of TGCRCNC (R, purlne) in their regulatory region. MRE-11ke sequeaees were also found in many other metal-related genes. To see whether there is also such a sequence at the genetic locus (13q14. 3) d Wilstm disease, which is a genetic disorder d copper metabolisa''n, junction-trapping method baaed on the MRE sequence was used. A fragment containing MRE and MRE-like sequences from YAC 27D8 at the WND locus was successfully cloned and mapped back to the YAC by PC, R, Presence of such a sequence in the copper transporter gene at the W''D locus might imply that it has a possible interesting role in the regulation of WD gene expression.

  16. Activation of estrogen response elements is mediated both via estrogen and muscle contractions in rat skeletal muscle myotubes

    DEFF Research Database (Denmark)

    Wiik, A.; Hellsten, Ylva; Berthelson, P.

    2009-01-01

    The aim of the present study was to investigate the activation of estrogen response elements (EREs) by estrogen and muscle contractions in rat myotubes in culture and to assess whether the activation is dependent on the estrogen receptors (ERs). In addition, the effect of estrogen and contraction...... then differentiated into myotubes and subjected to either estrogen or electrical stimulation. Activation of the ERE sequence was determined by measurement of luciferase activity. The results show that both ERalpha and ERbeta are expressed in myotubes from rats. Both estrogen stimulation and muscle contraction...... increased (P muscle contraction. Use of ER antagonists showed that, whereas the estrogen-induced transactivation is mediated via ERs, the effect of muscle contraction...

  17. Development of a Finite Element Model of the Human Shoulder to Investigate the Mechanical Responses and Injuries in Side Impact

    Science.gov (United States)

    Iwamoto, Masami; Miki, Kazuo; Yang, King H.

    Previous studies in both fields of automotive safety and orthopedic surgery have hypothesized that immobilization of the shoulder caused by the shoulder injury could be related to multiple rib fractures, which are frequently life threatening. Therefore, for more effective occupant protection, it is important to understand the relationship between shoulder injury and multiple rib fractures in side impact. The purpose of this study is to develop a finite element model of the human shoulder in order to understand this relationship. The shoulder model included three bones (the humerus, scapula and clavicle) and major ligaments and muscles around the shoulder. The model also included approaches to represent bone fractures and joint dislocations. The relationships between shoulder injury and immobilization of the shoulder are discussed using model responses for lateral shoulder impact. It is also discussed how the injury can be related to multiple rib fractures.

  18. Fuzzy tandem repeats containing p53 response elements may define species-specific p53 target genes.

    Directory of Open Access Journals (Sweden)

    Iva Simeonova

    2012-06-01

    Full Text Available Evolutionary forces that shape regulatory networks remain poorly understood. In mammals, the Rb pathway is a classic example of species-specific gene regulation, as a germline mutation in one Rb allele promotes retinoblastoma in humans, but not in mice. Here we show that p53 transactivates the Retinoblastoma-like 2 (Rbl2 gene to produce p130 in murine, but not human, cells. We found intronic fuzzy tandem repeats containing perfect p53 response elements to be important for this regulation. We next identified two other murine genes regulated by p53 via fuzzy tandem repeats: Ncoa1 and Klhl26. The repeats are poorly conserved in evolution, and the p53-dependent regulation of the murine genes is lost in humans. Our results indicate a role for the rapid evolution of tandem repeats in shaping differences in p53 regulatory networks between mammalian species.

  19. Regulation of brain-derived neurotrophic factor exon IV transcription through calcium responsive elements in cortical neurons.

    Directory of Open Access Journals (Sweden)

    Fei Zheng

    Full Text Available Activity-dependent transcription of brain-derived neurotrophic factor (BDNF has been studied as an important model to elucidate the mechanisms underlying numerous aspects of neuroplasticity. It has been extensively emphasized that Ca(2+ influx through different routes may have significantly different effects on BDNF transcription. Here, we examined the regulatory property of the major calcium responsive elements (CaRE in BDNF promoter IV in cultured rat cortical neurons. BDNF promoter IV, as well as CaRE1 and CaRE3, was significantly activated by Ca(2+ influx through L-type voltage-gated calcium channel (L-VGCC or NMDA receptor (NMDAR. However, the L-VGCC- and NMDAR-mediated activation of CaRE was differentially regulated by different Ca(2+-stimulated protein kinases. Specifically, PKA, CaMKI, and CaMKIV activity were required for L-VGCC-, but not NMDAR-mediated CaRE1 activation. CaMKI activity was required for NMDAR- but not L-VGCC-mediated CaRE3 activation. Surprisingly, the activation of CaRF, a previously identified transcription factor for CaRE1, was stimulated via L-VGCC but not NMDAR, and required MEK, PI3K and CaMKII activity. These results suggest a new working model that activity-dependent BDNF IV up-regulation may be coordinately mediated by CaRE1 and CaRE3 activity, which show different responses to Ca(2+-stimulated kinases. Our data also explain how the individual cis-element in BDNF promoter is distinctively coupled to different Ca(2+ routes.

  20. P53 family members modulate the expression of PRODH, but not PRODH2, via intronic p53 response elements.

    Directory of Open Access Journals (Sweden)

    Ivan Raimondi

    Full Text Available The tumor suppressor p53 was previously shown to markedly up-regulate the expression of the PRODH gene, encoding the proline dehydrogenase (PRODH enzyme, which catalyzes the first step in proline degradation. Also PRODH2, which degrades 4-hydroxy-L-proline, a product of protein (e.g. collagen catabolism, was recently described as a p53 target. Here, we confirmed p53-dependent induction of endogenous PRODH in response to genotoxic damage in cell lines of different histological origin. We established that over-expression of TAp73β or TAp63β is sufficient to induce PRODH expression in p53-null cells and that PRODH expression parallels the modulation of endogenous p73 by genotoxic drugs in several cell lines. The p53, p63, and p73-dependent transcriptional activation was linked to specific intronic response elements (REs, among those predicted by bioinformatics tools and experimentally validated by a yeast-based transactivation assay. p53 occupancy measurements were validated in HCT116 and MCF7 human cell lines. Conversely, PRODH2 was not responsive to p63 nor p73 and, at best, could be considered a weak p53 target. In fact, minimal levels of PRODH2 transcript induction by genotoxic stress was observed exclusively in one of four p53 wild-type cell lines tested. Consistently, all predicted p53 REs in PRODH2 were poor matches to the p53 RE consensus and showed very weak responsiveness, only to p53, in the functional assay. Taken together, our results highlight that PRODH, but not PRODH2, expression is under the control of p53 family members, specifically p53 and p73. This supports a deeper link between proteins of the p53-family and metabolic pathways, as PRODH modulates the balance of proline and glutamate levels and those of their derivative alpha-keto-glutarate (α-KG under normal and pathological (tumor conditions.

  1. Exposure to residual concentrations of elements from a remediated coal fly ash spill does not adversely influence stress and immune responses of nestling tree swallows.

    Science.gov (United States)

    Beck, Michelle L; Hopkins, William A; Hallagan, John J; Jackson, Brian P; Hawley, Dana M

    2014-01-01

    Anthropogenic activities often produce pollutants that can affect the physiology, growth and reproductive success of wildlife. Many metals and trace elements play important roles in physiological processes, and exposure to even moderately elevated concentrations of essential and non-essential elements could have subtle effects on physiology, particularly during development. We examined the effects of exposure to a number of elements from a coal fly ash spill that occurred in December 2008 and has since been remediated on the stress and immune responses of nestling tree swallows. We found that nestlings at the site of the spill had significantly greater blood concentrations of Cu, Hg, Se and Zn in 2011, but greater concentrations only of Se in 2012, in comparison to reference colonies. The concentrations of elements were below levels of significant toxicological concern in both years. In 2011, we found no relationship between exposure to elements associated with the spill and basal or stress-induced corticosterone concentrations in nestlings. In 2012, we found that Se exposure was not associated with cell-mediated immunity based on the response to phytohaemagglutinin injection. However, the bactericidal capacity of nestling plasma had a positive but weak association with blood Se concentrations, and this association was stronger at the spill site. Our results indicate that exposure to these low concentrations of elements had few effects on nestling endocrine and immune physiology. The long-term health consequences of low-level exposure to elements and of exposure to greater element concentrations in avian species require additional study.

  2. How to run a sports camp – legally speaking

    Directory of Open Access Journals (Sweden)

    Steven Monk

    2016-04-01

    Full Text Available Camps are a great way to keep kids active throughout the summer and to make money for the program sponsoring them. Planning is needed for a sports camp to be safe for both the camp personnel and the athletes, and to minimize legal negligence.  Having a risk management plan in place is important to insure that everyone is aware of the risks of participating. Background checks on camp personnel help ensure the camp leaders and coaches do not have a criminal background.  It is important to inspect the facilities/equipment to make sure they are safe to use.  Athletic trainers help with injuries that may occur with participation.  Supervisors make sure that everyone is accounted for and camp rules help the campers behave in an appropriate manner.  When planning activities, it is important to look at the skill level of the athletes. If all of these areas are covered, camps should be legally protected if an issue were to arise.

  3. Camp Sports Injuries: Analysis of Causes, Modes and Frequencies

    Directory of Open Access Journals (Sweden)

    Panagiota Papageorgiou

    2008-12-01

    Full Text Available The purpose of this study was the description of sports injuries sustained by campers at summer camps, aged 7-15 years. A sample of 8 camps from the Greek camp population participated in this sport injury surveillance study. Doctors and camp directors completed reports detailing the number of sports injuries events sustained and provided specific information about each event. During the period of the study, 337 sport injury reports were completed. A total of 237 (70.3% boys and 100 (29.7% girls reported having a sport injury. Age of campers sustaining a sport injury was 10-12 years old (60.8%. The frequency of sports injuries was highest during the first camp season. The leading causes of sports injuries in children’s were: falls, crushed by object, collision with other person and slips. Cut/scratch injuries were the most common diagnoses (38.9%. Football, basketball and volleyball were the most frequent sport activities for injuries. Reports based surveillance systems can be successfully used to conducts sport injury surveillance among children attending summer camps. Data collected via such systems can be used to calculate sports injury rates, to describe patterns of sport injury and to identify risk factors for camper – related sport injuries. The results provide necessary information to develop prevention interventions to decrease the number of youth whose camp experiences are negatively affected by sport injury.

  4. Expression of MUC17 is regulated by HIF1α-mediated hypoxic responses and requires a methylation-free hypoxia responsible element in pancreatic cancer.

    Directory of Open Access Journals (Sweden)

    Sho Kitamoto

    Full Text Available MUC17 is a type 1 membrane-bound glycoprotein that is mainly expressed in the digestive tract. Recent studies have demonstrated that the aberrant overexpression of MUC17 is correlated with the malignant potential of pancreatic ductal adenocarcinomas (PDACs; however, the exact regulatory mechanism of MUC17 expression has yet to be identified. Here, we provide the first report of the MUC17 regulatory mechanism under hypoxia, an essential feature of the tumor microenvironment and a driving force of cancer progression. Our data revealed that MUC17 was significantly induced by hypoxic stimulation through a hypoxia-inducible factor 1α (HIF1α-dependent pathway in some pancreatic cancer cells (e.g., AsPC1, whereas other pancreatic cancer cells (e.g., BxPC3 exhibited little response to hypoxia. Interestingly, these low-responsive cells have highly methylated CpG motifs within the hypoxia responsive element (HRE, 5'-RCGTG-3', a binding site for HIF1α. Thus, we investigated the demethylation effects of CpG at HRE on the hypoxic induction of MUC17. Treatment of low-responsive cells with 5-aza-2'-deoxycytidine followed by additional hypoxic incubation resulted in the restoration of hypoxic MUC17 induction. Furthermore, DNA methylation of HRE in pancreatic tissues from patients with PDACs showed higher hypomethylation status as compared to those from non-cancerous tissues, and hypomethylation was also correlated with MUC17 mRNA expression. Taken together, these findings suggested that the HIF1α-mediated hypoxic signal pathway contributes to MUC17 expression, and DNA methylation of HRE could be a determinant of the hypoxic inducibility of MUC17 in pancreatic cancer cells.

  5. Roles of Salicylic Acid-responsive Cis-acting Elements and W-boxes in Salicylic Acid Induction of VCH3 Promoter in Transgenic Tobaccos

    Institute of Scientific and Technical Information of China (English)

    Hai-Yan LI; Wei WEI; Yu LI

    2006-01-01

    A salicylic acid (SA)-inducible VCH3 promoter was recently identified from grapevine (Vitis amurensis) that contains two inverse SA-responsive cis-acting elements and four W-boxes. To further demonstrate the roles of these elements, four fragments with lengths from -1187, -892, -589, -276 to +7 bp were fused with the β-glucuronidase (GUS) reporter gene and transferred to Nicotiana tobacum,together with another four VCH3 promoter fragments with mutation in the two inverse SA-responsive elements. The functions of each promoter fragment were examined by analysis of GUS activity in the transgenic tobacco root treated with SA. Enhanced GUS activity was shown in the roots of transgenic tobaccos with the VCH3 (-1187)-GUS construct containing two SA-responsive cis-acting elements and four W-boxes. However, GUS activity directed by the VCH3 (-892)-GUS construct, containing one SA cisacting element and four W-boxes, was reduced by up to 35% compared with that in tobaccos transformed with the VCH3 (-1187)-GUS construct, indicating that the SA cis-acting element plays an important role in SA induction of the VCH3 promoter. Neither the m2VCH3 (-1187)-GUS nor the m VCH3 (-892)-GUSconstruct, with mutation on the SA-responsive elements, abolished the expression of GUS activity, demonstrating that the W-boxes in the VCH3 promoter are also involved in SA induction. Histochemical analysis of GUS activity directed by each of the eight VCH3 promoter fragments showed that GUS was expressed specifically in vascular tissue. It was concluded that both the SA-responsive cis-acting elements and the Wboxes are important for the SA induction of the VCH3 promoter. This promoter might have a potential use in plant genetic engineering.

  6. Associative conditioning analog selectively increases cAMP levels of tail sensory neurons in Aplysia.

    Science.gov (United States)

    Ocorr, K A; Walters, E T; Byrne, J H

    1985-04-01

    Bilateral clusters of sensory neurons in the pleural ganglia of Aplysia contain cells involved in a defensive tail withdrawal reflex. These cells exhibit heterosynaptic facilitation in response to noxious skin stimulation that can be mimicked by the application of serotonin. Recently it has been shown that this facilitation can be selectively amplified by the application of a classical conditioning procedure to individual sensory neurons. We now report that an analog of this classical conditioning paradigm produces a selective amplification of the cAMP content of isolated sensory neuron clusters. The enhancement is achieved within a single trial and appears to be localized to the sensory neurons. These results indicate that a pairing-specific enhancement of cAMP levels may be a biochemical mechanism for associative neuronal modifications and perhaps learning.

  7. Hydroponics: A Versatile System to Study Nutrient Allocation and Plant Responses to Nutrient Availability and Exposure to Toxic Elements.

    Science.gov (United States)

    Nguyen, Nga T; McInturf, Samuel A; Mendoza-Cózatl, David G

    2016-07-13

    Hydroponic systems have been utilized as one of the standard methods for plant biology research and are also used in commercial production for several crops, including lettuce and tomato. Within the plant research community, numerous hydroponic systems have been designed to study plant responses to biotic and abiotic stresses. Here we present a hydroponic protocol that can be easily implemented in laboratories interested in pursuing studies on plant mineral nutrition. This protocol describes the hydroponic system set up in detail and the preparation of plant material for successful experiments. Most of the materials described in this protocol can be found outside scientific supply companies, making the set up for hydroponic experiments less expensive and convenient. The use of a hydroponic growth system is most advantageous in situations where the nutrient media need to be well controlled and when intact roots need to be harvested for downstream applications. We also demonstrate how nutrient concentrations can be modified to induce plant responses to both essential nutrients and toxic non-essential elements.

  8. Finite Element Modeling and Analysis of Nonlinear Impact and Frictional Motion Responses Including Fluid—Structure Coupling Effects

    Directory of Open Access Journals (Sweden)

    Yong Zhao

    1997-01-01

    Full Text Available A nonlinear three dimensional (3D single rack model and a nonlinear 3D whole pool multi-rack model are developed for the spent fuel storage racks of a nuclear power plant (NPP to determine impacts and frictional motion responses when subjected to 3D excitations from the supporting building floor. The submerged free standing rack system and surrounding water are coupled due to hydrodynamic fluid-structure interaction (FSI using potential theory. The models developed have features that allow consideration of geometric and material nonlinearities including (1 the impacts of fuel assemblies to rack cells, a rack to adjacent racks or pool walls, and rack support legs to the pool floor; (2 the hydrodynamic coupling of fuel assemblies with their storing racks, and of a rack with adjacent racks, pool walls, and the pool floor; and (3 the dynamic motion behavior of rocking, twisting, and frictional sliding of rack modules. Using these models 3D nonlinear time history dynamic analyses are performed per the U.S. Nuclear Regulatory Commission (USNRC criteria. Since few such modeling, analyses, and results using both the 3D single and whole pool multiple rack models are available in the literature, this paper emphasizes description of modeling and analysis techniques using the SOLVIA general purpose nonlinear finite element code. Typical response results with different Coulomb friction coefficients are presented and discussed.

  9. Discrete element modeling of Martian pit crater formation in response to extensional fracturing and dilational normal faulting

    Science.gov (United States)

    Smart, Kevin J.; Wyrick, Danielle Y.; Ferrill, David A.

    2011-04-01

    Pit craters, circular to elliptical depressions that lack a raised rim or ejecta deposits, are common on the surface of Mars. Similar structures are also found on Earth, Venus, the Moon, and smaller planetary bodies, including some asteroids. While it is generally accepted that these pits form in response to material drainage into a subsurface void space, the primary mechanism(s) responsible for creating the void is a subject of debate. Previously proposed mechanisms include collapse into lave tubes, dike injection, extensional fracturing, and dilational normal faulting. In this study, we employ two-dimensional discrete element models to assess both extensional fracturing and dilational normal faulting as mechanisms for forming pit craters. We also examine the effect of mechanical stratigraphy (alternating strong and weak layers) and variation in regolith thickness on pit morphology. Our simulations indicate that both extensional fracturing and dilational normal faulting are viable mechanisms. Both mechanisms lead to generally convex (steepening downward) slope profiles; extensional fracturing results in generally symmetric pits, whereas dilational normal faulting produces strongly asymmetric geometries. Pit width is established early, whereas pit depth increases later in the deformation history. Inclusion of mechanical stratigraphy results in wider and deeper pits, particularly for the dilational normal faulting, and the presence of strong near-surface layers leads to pits with distinct edges as observed on Mars. The modeling results suggest that a thicker regolith leads to wider but shallower pits that are less distinct and may be more difficult to detect in areas of thick regolith.

  10. Regulation of Cox-2 by Cyclic AMP Response Element Binding Protein in Prostate Cancer: Potential Role for Nexrutine

    Directory of Open Access Journals (Sweden)

    Rita Ghosh

    2007-11-01

    Full Text Available We recently showed that NexrutineR, a Phellodendron amurense bark extract, suppresses proliferation of prostate cancer cell lines and tumor development in the transgenic adenocarcinoma of mouse prostate (TRAMP model. Our data also indicate that the antiproliferative effects of NexrutineR are mediated in part by Akt and Cyclic AMP response element binding protein (CREB. Cyclooxygenase (Cox-2, a pro-inflammatory mediator, is a CREB target that induces prostaglandin E2 (PGE2 and suppresses apoptosis. Treatment of LNCaP cells with NexrutineR reduced tumor necrosis factor α-induced enzymatic as well as promoter activities of Cox-2. NexrutineR also reduced the expression and promoter activity of Cox-2 in PC-3 cells that express high constitutive levels of Cox-2. Deletion analysis coupled with mutational analysis of the Cox-2 promoter identified CRE as being sufficient for mediating NexrutineR response. Immunohistochemical analysis of human prostate tumors show increased expression of CREB and DNA binding activity in high-grade tumors (three-fold higher in human prostate tumors compared to normal prostate; P = .01. We have identified CREB-mediated activation of Cox-2 as a potential signaling pathway in prostate cancer which can be blocked with a nontoxic, cost-effective dietary supplement like NexrutineR, demonstrating a prospective for development of NexrutineR for prostate cancer management.

  11. Imaging alterations of cardiomyocyte cAMP microdomains in disease

    Directory of Open Access Journals (Sweden)

    Alexander eFroese

    2015-08-01

    Full Text Available 3’,5’-cyclic adenosine monophosphate (cAMP is an important second messenger which regulates heart function by acting in distinct subcellular microdomains. Recent years have provided deeper mechanistic insights into compartmentalized cAMP signaling and its link to cardiac disease. In this mini review, we summarize newest developments in this field achieved by cutting-edge biochemical and biophysical techniques. We further compile the data from different studies into a bigger picture of so far uncovered alterations in cardiomyocyte cAMP microdomains which occur in compensated cardiac hypertrophy and chronic heart failure. Finally, future research directions and translational perspectives are briefly discussed.

  12. Retinoic acid and cAMP inhibit rat hepatocellular carcinoma cell proliferation and enhance cell differentiation

    Energy Technology Data Exchange (ETDEWEB)

    Ionta, M. [Instituto de Ciências Biomédicas, Universidade Federal de Alfenas, Alfenas MG (Brazil); Departamento de Biologia Celular e do Desenvolvimento, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo SP (Brazil); Rosa, M.C.; Almeida, R.B.; Freitas, V.M.; Rezende-Teixeira, P.; Machado-Santelli, G.M. [Departamento de Biologia Celular e do Desenvolvimento, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo SP (Brazil)

    2012-05-25

    Hepatocellular carcinoma (HCC) is the third highest cause of cancer death worldwide. In general, the disease is diagnosed at an advanced stage when potentially curative therapies are no longer feasible. For this reason, it is very important to develop new therapeutic approaches. Retinoic acid (RA) is a natural derivative of vitamin A that regulates important biological processes including cell proliferation and differentiation. In vitro studies have shown that RA is effective in inhibiting growth of HCC cells; however, responsiveness to treatment varies among different HCC cell lines. The objective of the present study was to determine if the combined use of RA (0.1 µM) and cAMP (1 mM), an important second messenger, improves the responsiveness of HCC cells to RA treatment. We evaluated the proliferative behavior of an HCC cell line (HTC) and the expression profile of genes related to cancer signaling pathway (ERK and GSK-3β) and liver differentiation [E-cadherin, connexin 26 (Cx26), and connexin 32 (Cx32)]. RA and cAMP were effective in inhibiting the proliferation of HTC cells independently of combined use. However, when a mixture of RA and cAMP was used, the signals concerning the degree of cell differentiation were increased. As demonstrated by Western blot, the treatment increased E-cadherin, Cx26, Cx32 and Ser9-GSK-3β (inactive form) expression while the expression of Cx43, Tyr216-GSK-3β (active form) and phosphorylated ERK decreased. Furthermore, telomerase activity was inhibited along treatment. Taken together, the results showed that the combined use of RA and cAMP is more effective in inducing differentiation of HTC cells.

  13. Ammonia differentially suppresses the cAMP chemotaxis of anterior-like cells and prestalk cells in Dictyostelium discoideum

    Indian Academy of Sciences (India)

    Ira N Feit; Erika J Medynski; Michael J Rothrock

    2001-06-01

    A drop assay for chemotaxis to cAMP confirms that both anterior-like cells (ALC) and prestalk cells (pst cells) respond to cAMP gradients. We present evidence that the chemotactic response of both ALC and pst cells is suppressed by ammonia, but a higher concentration of ammonia is required to suppress the response in pst cells. ALC show a chemotactic response to cAMP when moving on a substratum of prespore cells in isolated slug posteriors incubated under oxygen. ALC chemotaxis on a prespore cell substratum is suppressed by the same concentration of ammonia that suppresses ALC chemotaxis on the agar substratum in drop assays. Chemotaxis suppression is mediated by the unprotonated (NH3) species of ammonia. The observed suppression, by ammonia, of ALC chemotaxis to cAMP supports our earlier hypothesis that ammonia is the tip-produced suppressor of such chemotaxis. We discuss implications of ammonia sensitivity of pst cells and ALC with regard to the movement and localization of ALC and pst cells in the slug and to the roles played by ALC in fruiting body formation. In addition, we suggest that a progressive decrease in sensitivity to ammonia is an important part of the maturation of ALC into pst cells.

  14. Understanding a Spiritual Youth Camp as a Consciousness Raising Group: The Effects of a Subculture's Communication.

    Science.gov (United States)

    Schnell, Jim

    This paper defines a spiritual youth camp as a consciousness raising group. The camp, founded in 1956 as a community church camp, has been independent of any religious denomination since disassociating from the founding community church in 1986. Communication processes are described as they relate to primary aspects of the camp experience. Primary…

  15. ["Anxiety glistens on our brows". Dream reports in literary works on the horrors of ghettos and concentration camps].

    Science.gov (United States)

    Klein, J

    1991-06-01

    Dream reports occupy a special place in literature about confinement in concentration camps and ghettos (Robert Antelme, Charlotte Delbo, Anna Langfus, André Schwarz-Bart). They are central elements in the narrative that relate the anxiety of those threatened with destruction more faithfully than any realistic account could. They disrupt the chronological linearity and rationality and represent in images horror beyond memory or description.

  16. Identification of fungus-responsive cis-acting element in the promoter of Brassica juncea chitinase gene, BjCHI1.

    Science.gov (United States)

    Gao, Ying; Zan, Xin-Li; Wu, Xue-Feng; Yao, Lei; Chen, Yu-Ling; Jia, Shuang-Wei; Zhao, Kai-Jun

    2014-02-01

    Chitinases are a group of pathogenesis-related proteins. The Brassica juncea chitinase gene BjCHI1 is highly inducible by pathogenic fungal infection, suggesting that the promoter of BjCHI1 might contain specific cis-acting element responsive to fungal attack. To identify the fungus-responsive element in BjCHI1 promoter (BjC-P), a series of binary plant transformation vectors were constructed by fusing the BjC-P or its deletion-derivatives to β-glucuronidase (GUS) reporter gene. Expression of the GUS reporter gene was systematically assayed by a transient gene expression system in Nicotiana benthamiana leaves treated with fungal elicitor Hexa-N-Acetyl-Chitohexaose, as well as in transgenic Arabidopsis plants inoculated with fungus Botrytis cinerea. The histochemical and quantitative GUS assays showed that the W-box-like element (GTAGTGACTCAT) in the region (-668 to -657) was necessary for the fungus-response, although there were another five W-box-like elements in BjC-P. In addition, gain-of-function analysis demonstrated that the fragment (-409 to -337) coupled to the W-box-like element was needed for full magnitude of the fungal induction. These results revealed the existence of a novel regulation mechanism of W-box-like element involved in plant pathogenic resistance, and will benefit the potential application of BjC-P in engineering crops.

  17. New York Operation: Military Kids Afterschool Universe Cosmic Camps

    Science.gov (United States)

    Schaff, N.

    2010-08-01

    The Cornell Center for Radiophysics and Space Research education and public outreach program and the New York State Operation: Military Kids program partnered to plan four weekend "Cosmic Camps" for youth from military families using the NASA Afterschool Universe program.

  18. Nationalsozialistische Konzentrations- und Vernichtungslager National Socialist Concentration and Extermination Camps

    Directory of Open Access Journals (Sweden)

    Max Plassmann

    2000-11-01

    Full Text Available Das Buch stellt Organisationsformen, Zuständigkeiten und Politik hinter dem nationalsozialistischen Konzentrationslagersystem dar.This book presents organization, competences and policies underlying the system of National Socialist concentration camps.

  19. Building a Successful Middle School Outreach Effort: Microscopy Camp

    Science.gov (United States)

    Penn, Lee R.; Flynn, Leslie; Johnson, Page

    2007-01-01

    Microscopy Camp program is designed to introduce acceptable representations of crystalline particles and their atomic structure to twelve-year-old middle school students at a developmental and educational stage.

  20. A summer day camp approach to adolescent weight loss.

    Science.gov (United States)

    Southam, M A; Kirkley, B G; Murchison, A; Berkowitz, R I

    1984-01-01

    Twenty-five overweight adolescents completed a summer weight loss day camp program on the Stanford University campus. All participants attended camp four days per week for four hours to learn and practice eating and exercise skills conducive to weight loss. Parents met weekly to discuss the program content and to explore their role in their adolescent's weight management. At posttreatment, reductions were achieved in weight, percent overweight, and skinfold, with greater changes observed for the eight-week group than for the four-week group. Improvements were also evident in participants' self-reported habits and knowledge of weight management concepts. Parent and participant assessment of the camp experience was very positive. The results of the summer weight loss day camp suggest that an intensive program of eating and exercise habit instruction, practice, and monitoring, which allows the participants to remain in the home setting, may provide benefits not found in other more traditional approaches to adolescent weight loss.

  1. Cardiac cAMP: production, hydrolysis, modulation and detection

    Directory of Open Access Journals (Sweden)

    Cédric eBOULARAN

    2015-10-01

    Full Text Available Cyclic adenosine 3’,5’-monophosphate (cAMP modulates a broad range of biological processes including the regulation of cardiac myocyte contractile function where it constitutes the main second messenger for β-adrenergic receptors’ signaling to fulfill positive chronotropic, inotropic and lusitropic effects. A growing number of studies pinpoint the role of spatial organization of the cAMP signaling as an essential mechanism to regulate cAMP outcomes in cardiac physiology. Here, we will briefly discuss the complexity of cAMP synthesis and degradation in the cardiac context, describe the way to detect it and review the main pharmacological arsenal to modulate its availability.

  2. 14 CFR 91.1423 - CAMP: Maintenance organization.

    Science.gov (United States)

    2010-01-01

    ... Operations Program Management § 91.1423 CAMP: Maintenance organization. (a) Each program manager who... maintenance, or alterations, must organize the performance of those functions so as to separate the...

  3. The Physics of Quidditch Summer Camp: An Interdisciplinary Approach

    Science.gov (United States)

    Hammer, Donna; Uher, Tim

    The University of Maryland Physics Department has developed an innovative summer camp program that takes an interdisciplinary approach to engaging and teaching physics. The Physics of Quidditch Camp uniquely sits at the intersection of physics, sports, and literature, utilizing the real-life sport of quidditch adapted from the Harry Potter novels to stimulate critical thinking about real laws of physics and leaps of imagination, while actively engaging students in learning the sport and discussing the literature. Throughout the camp, middle school participants become immersed in fun physics experiments and exciting physical activities, which aim to build and enhance skills in problem-solving, analytical thinking, and teamwork. This camp has pioneered new ways of teaching physics to pre-college students, successfully engaged middle school students in learning physics, and grown a large demand for such activities.

  4. [C-AMP concentration in various organs of female rats and in human ovaries with aging (author's transl)].

    Science.gov (United States)

    Arima, M

    1982-02-01

    The change in 3',5'-cyclic adenosine monophosphate (c-AMP) concentration was observed in various organs of rats in gonadal cycle in adult group and with aging (30, 70, 100, 120 weeks), and in human ovaries with aging. 1) The average c-AMP concentration of ovaries of rats showed a significant change with estrus cycle and was higher in the following sequence: proestrus, diestrus II, diestrus I and estrus phase. This tendency was also seen in hypothalamus and pituitary, but was not statistically significant, 2) The average c-AMP concentration in tissues began to decline significantly from 70 weeks in cerebral cortex and hypothalamus, and from 80 weeks in ovaries. However, on the other hand the concentrations in pituitary, liver and adrenal declined markedly from 100 weeks. 3) The c-AMP in ovaries of 80 weeks rats by pregnant mare serum (PMS) road increased by 0.5-fold in concentration, and by 0.6-fold in whole tissue relative to that of 30 weeks rats. 4) A significant difference in serum LH and FSH level between ovarian artery and vein was not found in cycling mature group, non-cycling climacteric group and post-menopausal group of women. 5) Both average concentrations and total values of c-AMP in ovaries of non-cycling climacteric and post-menopausal women were lower than those of mature cycling women. This fact may imply a different response by ovarian tissues such as corpus luteum, follicle and other tissues to gonadotropin. From these results of c-AMP in tissues, it is concluded that the decline of ovarian function with aging of rats was relatively earlier than pituitary, although being delayed compared with hypothalamus, and were the ovarian function in humans declined in the premenopausal period.

  5. Science and technology camp for girls. Final report

    Energy Technology Data Exchange (ETDEWEB)

    1993-12-31

    This document reports on the success of Pacific University`s camp held during the summers of 1992 and 1993; ultimate goal of this summer day camp was to increase the number of women in technical and scientific fields. Some experimentation was done with the age groups (7th and 8th grade girls). The curriculum was biology, chemistry, physics, and mathematics/computer science. Laboratory work and field trips were emphasized, along with socialization.

  6. The Effect of a Nature Camp on Children’s Conceptions of Nature

    OpenAIRE

    Esra Yardimci; Gulsen Leblebicioglu

    2012-01-01

    In this study, a nature camp which provides authentic learning opportunities for children was conducted. Twenty-four 4th and 5th graders (9 girls, 15 boys) participated to the camp. The camp program started with observations in the forest nearby. More focused observations were also made. Children discussed their observations with their friends and scientists. A questionnaire was applied at the beginning and end of the camp. The results showed that the nature camp program was effective in exte...

  7. Induction of the mammalian stress response gene GADD153 by oxidative stress: role of AP-1 element.

    Science.gov (United States)

    Guyton, K Z; Xu, Q; Holbrook, N J

    1996-01-01

    GADD153 is a CCAAT/enhancer-binding-protein-related gene that may function to control cellular growth in response to stress signals. In this study, a variety of oxidant treatments were shown to stimulate endogenous GADD153 mRNA expression and to transcriptionally activate a GADD153 promoter-reporter gene construct in transfected HeLa cells. Both commonalities and distinctions in the induction of GADD153 by H2O2 and the thiol-reactive compound arsenite were demonstrated. GADD153 mRNA induction by both H2O2 and arsenite was potentiated by GSH depletion, and completely inhibited by N-acetyl-cysteine. o-Phenanthroline and mannitol blocked GADD153 induction by H2O2, indicating that iron-generated hydroxyl radical mediates this induction. Concordantly, GSH peroxidase overexpression in WI38 cells attenuated GADD153 mRNA induction by H2O2. However, GADD153 induction by arsenite was only modestly reduced in the same cells, suggesting a lesser contribution of peroxides to gene activation by arsenite. We also demonstrated that oxidative stress participates in the induction of GADD153 by UVC (254 nm) irradiation. Finally, both promoter-deletion analysis and point mutation of the AP-1 site in an otherwise intact promoter support a significant role for AP-1 in transcriptional activation of GADD153 by UVC or oxidant treatment. Indeed, exposure of cells to oxidants or UVC stimulated binding of Fos and Jun to the GADD153 AP-1 element. Together, these results demonstrate that both free-radical generation and thiol modification can transcriptionally activate GADD153, and that AP-1 is critical to oxidative regulation of this gene. This study further supports a role for the GADD153 gene product in the cellular response to oxidant injury. PMID:8670069

  8. Intrauterine growth restriction perturbs nucleosome depletion at a growth hormone-responsive element in the mouse IGF-1 gene.

    Science.gov (United States)

    McKnight, Robert A; Yost, Christian C; Yu, Xing; Wiedmeier, Julia E; Callaway, Christopher W; Brown, Ashley S; Lane, Robert H; Fung, Camille M

    2015-12-01

    Intrauterine growth restriction (IUGR) is a common human pregnancy complication. IUGR offspring carry significant postnatal risk for early-onset metabolic syndrome, which is associated with persistent reduction in IGF-1 protein expression. We have previously shown that preadolescent IUGR male mice have decreased hepatic IGF-1 mRNA and circulating IGF-1 protein at postnatal day 21, the age when growth hormone (GH) normally upregulates hepatic IGF-1 expression. Here we studied nucleosome occupancy and CpG methylation at a putative growth hormone-responsive element in intron 2 (in2GHRE) of the hepatic IGF-1 gene in normal, sham-operated, and IUGR mice. Nucleosome occupancy and CpG methylation were determined in embryonic stem cells (ESCs) and in liver at postnatal days 14, 21, and 42. For CpG methylation, additional time points out to 2 yr were analyzed. We confirmed the putative mouse in2GHRE was GH-responsive, and in normal mice, a single nucleosome was displaced from the hepatic in2GHRE by postnatal day 21, which exposed two STAT5b DNA binding sites. Nucleosome displacement correlated with developmentally programmed CpG demethylation. Finally, IUGR significantly altered the nucleosome-depleted region (NDR) at the in2GHRE of IGF-1 on postnatal day 21, with either complete absence of the NDR or with a shifted NDR exposing only one of two STAT5b DNA binding sites. An NDR shift was also seen in offspring of sham-operated mothers. We conclude that prenatal insult such as IUGR or anesthesia/surgery could perturb the proper formation of a well-positioned NDR at the mouse hepatic IGF-1 in2GHRE necessary for transitioning to an open chromatin state.

  9. Cloning and characterization of the dehydration-responsive element-binding protein 2A gene in Eruca vesicaria subsp sativa.

    Science.gov (United States)

    Huang, B L; Zhang, X K; Li, Y Y; Li, D Y; Ma, M Y; Cai, D T; Wu, W H; Huang, B Q

    2016-08-05

    Eruca vesicaria subsp sativa is one of the most tolerant Cruciferae species to drought, and dehydration-responsive element-binding protein 2A (DREB2A) is involved in responses to salinity, heat, and particularly drought. In this study, a gene encoding EvDREB2A was cloned and characterized in E. vesicaria subsp sativa. The full-length EvDREB2A cDNA sequence contained a 388-bp 5'-untranslated region (UTR), a 348-bp 3'-UTR, and a 1002-bp open reading frame that encoded 334 amino acid residues. The theoretical isoelectric point of the EvDREB2A protein was 4.80 and the molecular weight was 37.64 kDa. The genomic sequence of EvDREB2A contained no introns. Analysis using SMART indicated that EvDREB2A contains a conserved AP2 domain, similar to other plant DREBs. Phylogenetic analysis revealed that EvDREB2A and DREB2As from Brassica rapa, Eutrema salsugineum, Arabidopsis thaliana, Arabidopsis lyrata, and Arachis hypogaea formed a small subgroup, which clustered with DREB2Bs from A. lyrata, A. thaliana, Camelina sativa, and B. rapa to form a larger subgroup. EvDREB2A is most closely related to B. rapa DREB2A, followed by DREB2As from E. salsugineum, A. thaliana, A. hypogaea, and A. lyrata. A quantitative real-time polymerase chain reaction indicated that EvDREB2A expression was highest in the leaves, followed by the roots and hypocotyls, and was lowest in the flower buds. EvDREB2A could be used to improve drought tolerance in crops.

  10. Characterization of cAMP accumulation mediated by three α1—adrenoceptor subtypes in HEK293 cells

    Institute of Scientific and Technical Information of China (English)

    SONGYao; HUANGYan; DongEr-Dan; HANQi-De; ZHANGYou-Yi

    2003-01-01

    AIM:To investigate the characterization of cAMP response mediated by α1-adrenoceptor (α1-AR) subtypes in HEK293 cells. METHODS:(1) Full-length cDNA encoding three α1-AR subtypes were transfected into HEK293 cells by the calcium phosphate precipitation method, respectively. (2) The densities of α1-AR subtypes expressed in HEK293 cells were measured by radioligand binding assay. (3)cAMP accumulation was measured by [3H] adenine prelabeling method. RESULTS: (1)Activation of each of three subtypes resulted in an increase of cAMP accumulation in HEK293 cells in a dose-dependent manner, which was inhibited by selective α1-AR antagonist prazosin. (2) Comparing the pharmacological property, the maximal responses of α1A-AR to agonists were the most potent, while the sensitivity of α1-AR subtypes to norepinephrine(NE) was the highest. CONCLUSION: Each of three α1-AR subtypes can mediate cAMP accumulation in HEK293 cell line, and there are differences in pharmacological property.

  11. Effect of ovine luteinizing hormone (oLH) charge isoforms on VEGF and cAMP production.

    Science.gov (United States)

    Montero-Pardo, Arnulfo; Diaz, Daniel; Olivares, Aleida; González-Padilla, Everardo; Murcia, Clara; Gómez-Chavarín, Margarita; Gutiérrez-Ospina, Gabriel; Perera-Marín, Gerardo

    2015-12-01

    Although an increase in VEGF expression and synthesis in association with LH has been established; it is unknown if all LH isoforms act similarly. This study evaluated the production of cAMP and VEGF among LH isoforms in two in vitro bioassays. The LH was obtained from hypophyses and the group of isoforms was isolated by chromatofocusing. cAMP production was assessed using the in vitro bioassay of HEK-293 cells and VEGF production was evaluated in granulosa cells. Immunological activity was measured with a homologous RIA. Immunoactivity and bioactivity for each isoform were compared against a standard, by estimating the IC50 and the EC50. The basic isoforms were more immunoactive than the standard. The neutral and the moderately acidic had an immunological activity similar to the standard. The acidic isoform was the least immunoreactive. cAMP production at the EC50 dose was similar among the basic isoforms, the moderately acidic and the standard; for the neutral and the acidic, the EC50 dose was higher. It was observed that compared with the control, VEGF production at the lowest LH dose was no different in the standard and each isoform. In the intermediate dose, a positive response was caused in the standard and the neutral and basic isoforms. Although the acidic isoform showed a dose-dependent response, it was not significant relative to the control. In conclusion, the basic isoform generated the greatest cAMP and VEGF production, similar to the reference standard, and the acidic the smallest.

  12. Transiently increasing cAMP levels selectively in hippocampal excitatory neurons during sleep deprivation prevents memory deficits caused by sleep loss.

    Science.gov (United States)

    Havekes, Robbert; Bruinenberg, Vibeke M; Tudor, Jennifer C; Ferri, Sarah L; Baumann, Arnd; Meerlo, Peter; Abel, Ted

    2014-11-19

    The hippocampus is particularly sensitive to sleep loss. Although previous work has indicated that sleep deprivation impairs hippocampal cAMP signaling, it remains to be determined whether the cognitive deficits associated with sleep deprivation are caused by attenuated cAMP signaling in the hippocampus. Further, it is unclear which cell types are responsible for the memory impairments associated with sleep deprivation. Transgenic approaches lack the spatial resolution to manipulate specific signaling pathways selectively in the hippocampus, while pharmacological strategies are limited in terms of cell-type specificity. Therefore, we used a pharmacogenetic approach based on a virus-mediated expression of a Gαs-coupled Drosophila octopamine receptor selectively in mouse hippocampal excitatory neurons in vivo. With this approach, a systemic injection with the receptor ligand octopamine leads to increased cAMP levels in this specific set of hippocampal neurons. We assessed whether transiently increasing cAMP levels during sleep deprivation prevents memory consolidation deficits associated with sleep loss in an object-location task. Five hours of total sleep deprivation directly following training impaired the formation of object-location memories. Transiently increasing cAMP levels in hippocampal neurons during the course of sleep deprivation prevented these memory consolidation deficits. These findings demonstrate that attenuated cAMP signaling in hippocampal excitatory neurons is a critical component underlying the memory deficits in hippocampus-dependent learning tasks associated with sleep deprivation.

  13. Three-dimensional integral imaging displays using a quick-response encoded elemental image array: an overview

    Science.gov (United States)

    Markman, A.; Javidi, B.

    2016-06-01

    Quick-response (QR) codes are barcodes that can store information such as numeric data and hyperlinks. The QR code can be scanned using a QR code reader, such as those built into smartphone devices, revealing the information stored in the code. Moreover, the QR code is robust to noise, rotation, and illumination when scanning due to error correction built in the QR code design. Integral imaging is an imaging technique used to generate a three-dimensional (3D) scene by combining the information from two-dimensional (2D) elemental images (EIs) each with a different perspective of a scene. Transferring these 2D images in a secure manner can be difficult. In this work, we overview two methods to store and encrypt EIs in multiple QR codes. The first method uses run-length encoding with Huffman coding and the double-random-phase encryption (DRPE) to compress and encrypt an EI. This information is then stored in a QR code. An alternative compression scheme is to perform photon-counting on the EI prior to compression. Photon-counting is a non-linear transformation of data that creates redundant information thus improving image compression. The compressed data is encrypted using the DRPE. Once information is stored in the QR codes, it is scanned using a smartphone device. The information scanned is decompressed and decrypted and an EI is recovered. Once all EIs have been recovered, a 3D optical reconstruction is generated.

  14. The expression of cyclic adenosine monophosphate responsive element modulator in rat sertoli cells following seminal extract administration

    Science.gov (United States)

    Akmal, Muslim; Siregar, Tongku Nizwan; Wahyuni, Sri; Hamny; Nasution, Mustafa Kamal; Indriati, Wiwik; Panjaitan, Budianto; Aliza, Dwinna

    2016-01-01

    Aim: This study aims to determine the effect of seminal vesicle extract on cyclic adenosine monophosphate responsive element modulator (CREM) expression in rat Sertoli cells. Materials and Methods: This study examined the expression of CREM on 20 male rats (Rattus norvegicus) at 4 months of age, weighing 250-300 g. The rats were divided into four groups: K0, KP1, KP2, and KP3. K0 group was injected with 0.2 ml normal saline; KP1 was injected with 25 mg cloprostenol (Prostavet C, Virbac S. A); KP2 and KP3 were injected with 0.2 and 0.4 ml seminal vesicle extract, respectively. The treatments were conducted 5 times within 12-day interval. At the end of the study, the rats were euthanized by cervical dislocation; then, the testicles were necropsied and processed for histology observation using immunohistochemistry staining. Results: CREM expression in rat Sertoli cells was not altered by the administration of either 0.2 or 0.4 ml seminal vesicle extract. Conclusion: The administration of seminal vesicle extract is unable to increase CREM expression in rat Sertoli cells. PMID:27733803

  15. Immunohistochemical Study of Nrf2-Antioxidant Response Element as Indicator of Oxidative Stress Induced by Cadmium in Developing Rats

    Directory of Open Access Journals (Sweden)

    Sergio Montes

    2015-01-01

    Full Text Available In developing animals, Cadmium (Cd induces toxicity to many organs including brain. Reactive oxygen species (ROS are often implicated in Cd-inducedtoxicity and it has been clearly demonstrated that oxidative stress interferes with the expression of genes as well as transcriptional factors such as Nrf2-dependent Antioxidant Response Element (Nrf2-ARE. Cd-generated oxidative stress and elevated Nrf2 activity have been reported in vitro and in situ cells. In this study we evaluated the morphological changes and the expression pattern of Nrf2 and correlated them with the Cd concentrations in different ages of developing rats in heart, lung, kidney, liver, and brain. The Cd content in different organs of rats treated with the metal was increased in all ages assayed. Comparatively, lower Cd brain levels were found in rats intoxicated at the age of 12 days, then pups treated at 5, 10, or 15 days old, at the same metal dose. No evident changes, as a consequence of cadmium exposure, were evident in the morphological analysis in any of the ages assayed. However, Nrf2-ARE immunoreactivity was observed in 15-day-old rats exposed to Cd. Our results support that fully developed blood-brain barrier is an important protector against Cd entrance to brain and that Nrf2 increased expression is a part of protective mechanism against cadmium-induced toxicity.

  16. Bile acid-activated nuclear receptor FXR suppresses apolipoprotein A-I transcription via a negative FXR response element

    Science.gov (United States)

    Claudel, Thierry; Sturm, Ekkehard; Duez, Hélène; Torra, Inés Pineda; Sirvent, Audrey; Kosykh, Vladimir; Fruchart, Jean-Charles; Dallongeville, Jean; Hum, Dean W.; Kuipers, Folkert; Staels, Bart

    2002-01-01

    Serum levels of HDL are inversely correlated with the risk of coronary heart disease. The anti-atherogenic effect of HDL is partially mediated by its major protein constituent apoA-I. In this study, we identify bile acids that are activators of the nuclear receptor farnesoid X receptor (FXR) as negative regulators of human apoA-I expression. Intrahepatocellular accumulation of bile acids, as seen in patients with progressive familial intrahepatic cholestasis and biliary atresia, was associated with diminished apoA-I serum levels. In human apoA-I transgenic mice, treatment with the FXR agonist taurocholic acid strongly decreased serum concentrations and liver mRNA levels of human apoA-I, which was associated with reduced serum HDL levels. Incubation of human primary hepatocytes and hepatoblastoma HepG2 cells with bile acids resulted in a dose-dependent downregulation of apoA-I expression. Promoter mutation analysis and gel-shift experiments in HepG2 cells demonstrated that bile acid–activated FXR decreases human apoA-I promoter activity by a negative FXR response element mapped to the C site. FXR bound this site and repressed transcription in a manner independent of retinoid X receptor. The nonsteroidal synthetic FXR agonist GW4064 likewise decreased apoA-I mRNA levels and promoter activity in HepG2 cells. PMID:11927623

  17. The structure formed by inverted repeats in p53 response elements determines the transactivation activity of p53 protein.

    Science.gov (United States)

    Brázda, Václav; Čechová, Jana; Battistin, Michele; Coufal, Jan; Jagelská, Eva B; Raimondi, Ivan; Inga, Alberto

    2017-01-29

    The TP53 gene is the most frequently mutated gene in human cancer and p53 protein plays a crucial role in gene expression and cancer protection. Its role is manifested by interactions with other proteins and DNA. p53 is a transcription factor that binds to DNA response elements (REs). Due to the palindromic nature of the consensus binding site, several p53-REs have the potential to form cruciform structures. However, the influence of cruciform formation on the activity of p53-REs has not been evaluated. Therefore, we prepared sets of p53-REs with identical theoretical binding affinity in their linear state, but different probabilities to form extra helical structures, for in vitro and in vivo analyses. Then we evaluated the presence of cruciform structures when inserted into plasmid DNA and employed a yeast-based assay to measure transactivation potential of these p53-REs cloned at a chromosomal locus in isogenic strains. We show that transactivation in vivo correlated more with relative propensity of an RE to form cruciforms than to its predicted in vitro DNA binding affinity for wild type p53. Structural features of p53-REs could therefore be an important determinant of p53 transactivation function.

  18. FINITE ELEMENT SIMULATION FOR STRUCTURAL RESPONSE OF U7MO DISPERSION FUEL PLATES VIA FLUID-THERMAL-STRUCTURAL INTERACTION

    Energy Technology Data Exchange (ETDEWEB)

    Hakan Ozaltun; Herman Shen; Pavel Madvedev

    2010-11-01

    This article presents numerical simulation of dispersion fuel mini plates via fluid–thermal–structural interaction performed by commercial finite element solver COMSOL Multiphysics to identify initial mechanical response under actual operating conditions. Since fuel particles are dispersed in Aluminum matrix, and temperatures during the fabrication process reach to the melting temperature of the Aluminum matrix, stress/strain characteristics of the domain cannot be reproduced by using simplified models and assumptions. Therefore, fabrication induced stresses were considered and simulated via image based modeling techniques with the consideration of the high temperature material data. In order to identify the residuals over the U7Mo particles and the Aluminum matrix, a representative SEM image was employed to construct a microstructure based thermo-elasto-plastic FE model. Once residuals and plastic strains were identified in micro-scale, solution was used as initial condition for subsequent multiphysics simulations at the continuum level. Furthermore, since solid, thermal and fluid properties are temperature dependent and temperature field is a function of the velocity field of the coolant, coupled multiphysics simulations were considered. First, velocity and pressure fields of the coolant were computed via fluidstructural interaction. Computed solution for velocity fields were used to identify the temperature distribution on the coolant and on the fuel plate via fluid-thermal interaction. Finally, temperature fields and residual stresses were used to obtain the stress field of the plates via fluid-thermal-structural interaction.

  19. Cyclic AMP response element binding protein and brain-derived neurotrophic factor: Molecules that modulate our mood?

    Indian Academy of Sciences (India)

    A Nair; V A Vaidya

    2006-09-01

    Depression is the major psychiatric ailment of our times, afflicting ∼20% of the population. Despite its prevalence, the pathophysiology of this complex disorder is not well understood. In addition, although antidepressants have been in existence for the past several decades, the mechanisms that underlie their therapeutic effects remain elusive. Building evidence implicates a role for the plasticity of specific neuro-circuitry in both the pathophysiology and treatment of depression. Damage to limbic regions is thought to contribute to the etiology of depression and antidepressants have been reported to reverse such damage and promote adaptive plasticity. The molecular pathways that contribute to the damage associated with depression and antidepressant-mediated plasticity are a major focus of scientific enquiry. The transcription factor cyclic AMP response element binding protein (CREB) and the neurotrophin brain-derived neurotrophic factor (BDNF) are targets of diverse classes of antidepressants and are known to be regulated in animal models and in patients suffering from depression. Given their role in neuronal plasticity, CREB and BDNF have emerged as molecules that may play an important role in modulating mood. The purpose of this review is to discuss the role of CREB and BDNF in depression and as targets/mediators of antidepressant action.

  20. A distal intergenic region controls pancreatic endocrine differentiation by acting as a transcriptional enhancer and as a polycomb response element

    Science.gov (United States)

    Pardanaud-Glavieux, Corinne; García-Hurtado, Javier; Sauty, Claire; Guerci, Aline; Ferrer, Jorge

    2017-01-01

    Lineage-selective expression of developmental genes is dependent on the interplay between activating and repressive mechanisms. Gene activation is dependent on cell-specific transcription factors that recognize transcriptional enhancer sequences. Gene repression often depends on the recruitment of Polycomb group (PcG) proteins, although the sequences that underlie the recruitment of PcG proteins, also known as Polycomb response elements (PREs), remain poorly understood in vertebrates. While distal PREs have been identified in mammals, a role for positive-acting enhancers in PcG-mediated repression has not been described. Here we have used a highly efficient procedure based on lentiviral-mediated transgenesis to carry out in vivo fine-mapping of, cis-regulatory sequences that control lineage-specific activation of Neurog3, a master regulator of pancreatic endocrine differentiation. Our findings reveal an enhancer region that is sufficient to drive correct spacio-temporal expression of Neurog3 and demonstrate that this same region serves as a PRE in alternative lineages where Neurog3 is inactive. PMID:28225770

  1. Induction of electrophile-responsive element (EpRE)-mediated gene expression by tomato extracts in vitro.

    Science.gov (United States)

    Gijsbers, Linda; van Eekelen, Henriëtte D L M; Nguyen, Thuy H; de Haan, Laura H J; van der Burg, Bart; Aarts, Jac M M J G; Rietjens, Ivonne M C M; Bovy, Arnaud G

    2012-12-01

    The market for food products with additional health benefits is increasing rapidly and tools for identification of bio-functional characteristics of food items are essential. To facilitate the detection of beneficial effects of tomato on gene expression, methods to prepare tomato extracts suitable to test in the EpRE LUX assay and other cell-based reporter gene assays for health-related bioactivity mechanisms, were developed. An isoprenoid-containing chloroform extract of tomato fruit and most individual isoprenoids did not induce electrophile-responsive element (EpRE)-mediated gene expression. A semi-polar extract of tomato fruits, enzymatically hydrolysed to remove the glycosyl residues from the phenolic ingredients was able to induce EpRE-mediated luciferase expression at both mRNA and protein level, which might be partly due to the presence of quercetin, kaempferol, naringenin and naringenin chalcone. It was concluded that induction of EpRE-regulated genes, such as detoxifying phase II and antioxidant enzymes, may contribute to the beneficial health effects of tomato.

  2. Effects of gamma irradiation on the DNA-protein complex between the estrogen response element and the estrogen receptor

    Energy Technology Data Exchange (ETDEWEB)

    Stisova, Viktorie [Department of Radiation Dosimetry, Nuclear Physics Institute AS CR, Na Truhlarce 39/64, 18086 Praha 8 (Czech Republic); Goffinont, Stephane; Spotheim-Maurizot, Melanie [Centre de Biophysique Moleculaire CNRS, rue Charles Sadron, 45071 Orleans Cedex 2 (France); Davidkova, Marie, E-mail: davidkova@ujf.cas.c [Department of Radiation Dosimetry, Nuclear Physics Institute AS CR, Na Truhlarce 39/64, 18086 Praha 8 (Czech Republic)

    2010-08-15

    Signaling by estrogens, risk factors in breast cancer, is mediated through their binding to the estrogen receptor protein (ER), followed by the formation of a complex between ER and a DNA sequence, called estrogen response element (ERE). Anti-estrogens act as competitive inhibitors by blocking the signal transduction. We have studied in vitro the radiosensitivity of the complex between ERalpha, a subtype of this receptor, and a DNA fragment bearing ERE, as well as the influence of an estrogen (estradiol) or an anti-estrogen (tamoxifen) on this radiosensitivity. We observe that the complex is destabilized upon irradiation with gamma rays in aerated aqueous solution. The analysis of the decrease of binding abilities of the two partners shows that destabilization is mainly due to the damage to the protein. The destabilization is reduced when irradiating in presence of tamoxifen and is increased in presence of estradiol. These effects are due to opposite influences of the ligands on the loss of binding ability of ER. The mechanism that can account for our results is: binding of estradiol or tamoxifen induces distinct structural changes of the ER ligand-binding domain that can trigger (by allostery) distinct structural changes of the ER DNA-binding domains and thus, can differently affect ER-ERE interaction.

  3. The expression of cyclic adenosine monophosphate responsive element modulator in rat sertoli cells following seminal extract administration

    Directory of Open Access Journals (Sweden)

    Muslim Akmal

    2016-09-01

    Full Text Available Aim: This study aims to determine the effect of seminal vesicle extract on cyclic adenosine monophosphate responsive element modulator (CREM expression in rat Sertoli cells. Materials and Methods: This study examined the expression of CREM on 20 male rats (Rattus norvegicus at 4 months of age, weighing 250-300 g. The rats were divided into four groups: K0, KP1, KP2, and KP3. K0 group was injected with 0.2 ml normal saline; KP1 was injected with 25 mg cloprostenol (Prostavet C, Virbac S. A; KP2 and KP3 were injected with 0.2 and 0.4 ml seminal vesicle extract, respectively. The treatments were conducted 5 times within 12-day interval. At the end of the study, the rats were euthanized by cervical dislocation; then, the testicles were necropsied and processed for histology observation using immunohistochemistry staining. Results: CREM expression in rat Sertoli cells was not altered by the administration of either 0.2 or 0.4 ml seminal vesicle extract. Conclusion: The administration of seminal vesicle extract is unable to increase CREM expression in rat Sertoli cells.

  4. Effect of 2-Hydroxyethyl Methacrylate on Antioxidant Responsive Element-Mediated Transcription: A Possible Indication of Its Cytotoxicity

    Science.gov (United States)

    Orimoto, Ai; Suzuki, Takahiro; Ueno, Atsuko; Kawai, Tatsushi; Nakamura, Hiroshi; Kanamori, Takao

    2013-01-01

    Background The resin monomer 2-hydroxyethyl methacrylate (HEMA) is known to be more cytotoxic than methyl methacrylate (MMA). Using a luciferase reporter assay system, we previously showed that MMA activates the glutathione S-transferase alpha 1 gene (Gsta1) promoter through the anti-oxidant responsive element (ARE). However, it is not known whether HEMA induces ARE-mediated transcription. Methodology/Principal Findings We further developed the reporter system and studied the concentration-dependent effect of HEMA on ARE enhancer activity. The revised system employed HepG2 cells stably transfected with a destabilized luciferase reporter vector carrying 2 copies of the 41-bp ARE region of Gsta1. In this system, MMA increased ARE activity by 244-fold at 30 mM; HEMA augmented ARE activity at 3 mM more intensely than MMA (36-fold versus 11-fold) and was equipotent as MMA at 10 mM (56-fold activation); however, HEMA failed to increase ARE activity at 30 mM. In HepG2 cells, HEMA detectably lowered the cellular glutathione levels at 10 mM and cell viability at 30 mM, but MMA did not. Conclusions These results suggest that the low-concentration effect of HEMA on ARE activity reflects its cytotoxicity. Our reporter system used to examine ARE activity may be useful for evaluating cytotoxicities of resin monomers at concentrations lower than those for which cell viabilities are reduced. PMID:23516576

  5. Can You Hack It? Validating Predictors for IT Boot Camps

    Science.gov (United States)

    Gear, Courtney C.

    Given the large number of information technology jobs open and lack of qualified individuals to fill them, coding boot camps have sprung up in response to this skill gap by offering a specialized training program in an accelerated format. This fast growth has created a need to measure these training programs and understand their effectiveness. In the present study, a series of analyses examined whether specific or combinations of predictors were valid for training performance in this coding academy. Self-rated, daily efficacy scores were used as outcome variables of training success and correlation results showed a positive relationship with efficacy scores and the logic test score as a predictor. Exploratory analyses indicated a Dunning-Kruger effect where students with lower education levels experience higher overall mood during the training program. Limitations of the study included small sample size, severe range restriction in predictor scores, lack of variance in predictor scores, and low variability in training program success. These limitations made identifying jumps between training stages difficult to identify. By identifying which predictors matter most for each stage of skill acquisition, further research should consider more objective variables such as instructor scores which can serve as a guideline to better asses what stage learners join at and how to design curriculum and assignments accordingly (Honken, 2013).

  6. Multiple facets of cAMP signalling and physiological impact : cAMP compartmentalization in the lung

    NARCIS (Netherlands)

    Oldenburger, Anouk; Maarsingh, Harm; Schmidt, Martina

    2012-01-01

    Therapies involving elevation of the endogenous suppressor cyclic AMP (cAMP) are currently used in the treatment of several chronic inflammatory disorders, including chronic obstructive pulmonary disease (COPD). Characteristics of COPD are airway obstruction, airway inflammation and airway remodelli

  7. Hypoxia-response element (HRE)-directed transcriptional regulation of the rat lysyl oxidase gene in response to cobalt and cadmium.

    Science.gov (United States)

    Gao, Song; Zhou, Jing; Zhao, Yinzhi; Toselli, Paul; Li, Wande

    2013-04-01

    Lysyl oxidase (LO) catalyzes crosslink of collagen, elastin, and histone H1, stabilizing the extracellular matrix and cell nucleus. This enzyme displays dual functions for tumorigenesis, i.e., as a tumor suppressor inactivating the ras oncogene and as a tumor promoter enhancing malignant cell metastasis. To elucidate LO transcriptional regulation, we have cloned the 804 base pair region upstream of the translation start site (ATG) of the rat LO gene with the maximal promoter activity. Computer analysis indicated that at least four hypoxia-response element (HRE) consensuses (5'-ACGTG-3') exist in the cloned LO promoter. Treatment of rat lung fibroblasts (RFL6) with CoCl2 (Co, 10-100 μM), a chemical hypoxia reagent, enhanced LO mRNA expression and promoter activities. Overexpression of LO was associated with upregulation of hypoxia-inducible factor (HIF)-1α at mRNA levels in cobalt (Co)-treated cells. Thus, LO is a hypoxia-responsive gene. Dominant negative-HIF-1α inhibited LO promoter activities stimulated by Co. Electrophoretic mobility shift, oligonucleotide competition, and in vitro translated HIF-1α binding assays indicated that only one HRE mapped at -387/-383 relative to ATG was functionally active among four consensuses. Site-directed mutation of this HRE significantly diminished the Co-induced and LO promoter-directed expression of the reporter gene. Cadmium (Cd), an inducer of reactive oxygen species, inhibited HIF-1α mRNA expression and HIF-1α binding to the LO gene in Co-treated cells as revealed by RT-PCR and ChIP assays, respectively. Thus, modulation of the HRE activity by Co and Cd plays a critical role in LO gene transactivation.

  8. Effect of a wildlife conservation camp experience in China on student knowledge of animals, care, propensity for environmental stewardship, and compassionate behavior toward animals

    Science.gov (United States)

    Bexell, Sarah M.

    The goal of conservation education is positive behavior change toward animals and the environment. This study was conducted to determine whether participation in a wildlife conservation education camp was effective in positively changing 8-12 year old students': (a) knowledge of animals, (b) care about animals, (c) propensity for environmental and wildlife stewardship, and (d) compassionate behavior toward animals. During the summer of 2005, 2 five-day camps were conducted at 2 zoological institutions in Chengdu, China. The camp curriculum was influenced by theory and research on the following: conservation psychology, social learning theory, empathy and moral development theory, socio-biological theory, constructivist theory, and conservation science. Camp activities were sensitive to Chinese culture and included Chinese conservation issues. Activities were designed to help children form bonds with animals and care enough about them to positively change their behavior toward animals and the environment. This mixed methods study triangulated quantitative and qualitative data from six sources to answer the following: (1) Did camp increase student knowledge of animals? (2) Did camp increase student caring about animals? (3) Did camp increase student propensity for environmental and wildlife stewardship? (4) Did camp affect student compassionate behavior toward animals? A conservation stewards survey revealed significant increases on pre-post, self-report of knowledge, care, and propensity. Pre-post, rubric-scored responses to human-animal interaction vignettes indicated a significant increase in knowledge, and stable scores on care and propensity. Qualitative data from student journals, vignettes, and end-of-camp questionnaires demonstrated knowledge, caring, and propensity, and revealed the emergent theme empathy. To address question 4, instructors tallied campers' behavior toward animals using a student behavior ethogram. Occurrence of positive behaviors was

  9. ESTCP Munitions Response: Live Site Demonstration Former Camp Ellis

    Science.gov (United States)

    2014-07-01

    or potentially cold weather where plastic parts might break. Dynamic Surveys Dynamic Survey Efficiency Quickest and has highest user...with the MetalMapper and/or TEMTADS. The ends of the line were marked in the field with PVC pin flags. The seed items were distributed sufficiently...and start and end points of each IVS line at the ground surface with PVC pin flags or wooden stakes. In addition to the IVS, a test pit was dug near

  10. Interplay between estrogen response element sequence and ligands controls in vivo binding of estrogen receptor to regulated genes.

    Science.gov (United States)

    Krieg, Adam J; Krieg, Sacha A; Ahn, Bonnie S; Shapiro, David J

    2004-02-06

    To examine the role of the estrogen response element (ERE) sequence in binding of liganded estrogen receptor (ER) to promoters, we analyzed in vivo interaction of liganded ER with the imperfect ERE in the pS2 gene and the composite estrogen-responsive unit (ERU) in the proteinase inhibitor 9 (PI-9) gene. In transient transfections of ER-positive HepG2-ER7 cells, PI-9 was strongly induced by estrogen, moxestrol (MOX), and 4-hydroxytamoxifen (OHT). PI-9 was not induced by raloxifene or ICI 182,780. Quantitative reverse transcriptase-PCR showed that moxestrol strongly induced cellular PI-9 and pS2 mRNAs, whereas OHT moderately induced PI-9 mRNA and weakly induced pS2 mRNA. Chromatin immunoprecipitation experiments demonstrated strong and similar association of 17beta-estradiol-hERalpha and MOX-hERalpha with the PI-9 ERU and with the pS2 ERE. Binding of MOX-hERalpha to the PI-9 ERU and the pS2 ERE was rapid and continuous. Although MOX-hERalpha bound strongly to the PI-9 ERU and less well to the pS2 ERE in chromatin immunoprecipitation, gel shift assays showed that estrogen-hERalpha binds with higher affinity to the deproteinized pS2 ERE than to the PI-9 ERU. Across a broad range of OHT concentrations, OHT-hERalpha associated strongly with the pS2 ERE and weakly with the PI-9 ERU. ICI-hERalpha bound poorly to the PI-9 ERU and effectively to the pS2 ERE. Raloxifene-hERalpha and MOX-hERalpha exhibited similar binding to the PI-9 ERU and the pS2 ERE. These studies demonstrate that ER ligand and ERE sequence work together to regulate in vivo binding of ER to estrogen-responsive promoters.

  11. Regulation of Insulin-Response Element Binding Protein-1 in Obesity and Diabetes: Potential Role in Impaired Insulin-Induced Gene Transcription

    OpenAIRE

    2008-01-01

    One of the major mechanisms by which insulin modulates glucose homeostasis is through regulation of gene expression. Therefore, reduced expression of transcription factors that are required for insulin-regulated gene expression may contribute to insulin resistance. We recently identified insulin response element-binding protein-1 (IRE-BP1) as a transcription factor that binds and transactivates multiple insulin-responsive genes, but the regulation of IRE-BP1 in vivo is largely unknown. In thi...

  12. Newly constructed stable reporter cell lines for mechanistic studies on electrophile-responsive element-mediated gene expression reveal a role for flavonoid planarity

    NARCIS (Netherlands)

    Boerboom, A.M.J.F.; Vermeulen, M.; Woude, van der H.; Bremer, B.I.; Lee, Y.Y.; Kampman, E.; Bladeren, van P.J.; Rietjens, I.M.C.M.; Aarts, J.M.M.J.G.

    2006-01-01

    The electrophile-responsive element (EpRE) is a transcriptional enhancer involved in cancer-chemoprotective gene expression modulation by certain food components. Two stably transfected luciferase reporter cell lines were developed, EpRE(hNQO1)-LUX and EpRE(mGST-Ya)-LUX, based on EpRE sequences from

  13. Newly constructed stable reporter cell lines for mechanistic studies on electrophile-responsive element-mediated gene expression reveal a role for flavonoid planarity.

    NARCIS (Netherlands)

    Boerboom, A.M.A.; Vermeulen, M.; Woude, H. van der; Bremer, B.I.; Lee-Hilz, Y.Y.; Kampman, E.; Bladeren, P.J. van; Rietjens, I.M.C.M.; Aarts, J.

    2006-01-01

    The electrophile-responsive element (EpRE) is a transcriptional enhancer involved in cancer-chemoprotective gene expression modulation by certain food components. Two stably transfected luciferase reporter cell lines were developed, EpRE(hNQO1)-LUX and EpRE(mGST-Ya)-LUX, based on EpRE sequences from

  14. Potency of isothiocyanates to induce luciferase reporter gene expression via the electrophile-responsive element from murine glutathione S-transferase Ya

    NARCIS (Netherlands)

    Vermeulen, M.; Boerboom, A.M.J.F.; Blankvoort, B.M.G.; Aarts, J.M.M.J.G.; Rietjens, I.; Bladeren, van P.J.; Vaes, W.H.J.

    2009-01-01

    Isothiocyanates are electrophiles that are able to induce phase II biotransformation enzyme gene expression via an electrophile-responsive element (EpRE) in the gene regulatory region. To study the potency of different isothiocyanates to induce the expression of EpRE-regulated genes, a Hepa-1c1c7 lu

  15. The NO/cGMP pathway inhibits transient cAMP signals through the activation of PDE2 in striatal neurons

    Directory of Open Access Journals (Sweden)

    Marina ePolito

    2013-11-01

    Full Text Available The NO-cGMP signaling plays an important role in the regulation of striatal function although the mechanisms of action of cGMP specifically in medium spiny neurons (MSNs remain unclear. Using genetically encoded fluorescent biosensors, including a novel Epac-based sensor (EPAC-SH150 with increased sensitivity for cAMP, we analyze the cGMP response to NO and whether it affected cAMP/PKA signaling in MSNs. The Cygnet2 sensor for cGMP reported large responses to NO donors in both striatonigral and striatopallidal MSNs, and this cGMP signal was controlled partially by PDE2. At the level of cAMP brief forskolin stimulations produced transient cAMP signals which differed between D1 and D2 medium spiny neurons. NO inhibited these cAMP transients through cGMP-dependent PDE2 activation, an effect that was translated and magnified downstream of cAMP, at the level of PKA. PDE2 thus appears as a critical effector of NO which modulates the post-synaptic response of MSNs to dopaminergic transmission.

  16. Revisiting cAMP signaling in the carotid body

    Directory of Open Access Journals (Sweden)

    Ana Rita eNunes

    2014-10-01

    Full Text Available Chronic carotid body (CB activation is now recognized as being essential in the development of hypertension and promoting insulin resistance; thus, it is imperative to characterize the chemotransduction mechanisms of this organ in order to modulate its activity and improve patient outcomes. For several years, and although controversial, cyclic adenosine monophosphate (cAMP was considered an important player in initiating the activation of the CB. However, its relevance was partially displaced in the 90s by the emerging role of the mitochondria and molecules such as AMP-activated protein kinase (AMPK and O2-sensitive K+ channels. Neurotransmitters/neuromodulators binding to metabotropic receptors are essential to chemotransmission in the CB, and cAMP is central to this process. cAMP also contributes to raise intracellular Ca2+ levels, and is intimately related to the cellular energetic status (AMP/ATP ratio. Furthermore, cAMP signaling is a target of multiple current pharmacological agents used in clinical practice. This review provides an outline on 1 the classical view of the cAMP-signaling pathway in the CB that originally supported its role in the O2/CO2 sensing mechanism, 2 present recent evidence on CB cAMP neuromodulation and 3 discuss how CB activity is affected by current clinical therapies that modify cAMP-signaling, namely dopaminergic drugs, caffeine (modulation of A2A/A2B receptors and roflumilast (PDE4 inhibitors. cAMP is key to any process that involves metabotropic receptors and the intracellular pathways involved in CB disease states are likely to involve this classical second messenger. Research examining the potential modification of cAMP levels and/or interactions with molecules associated with CB hyperactivity is currently in its beginning and this review will open doors for future explorations.

  17. Emergency Medicine Residency Boot Camp Curriculum: A Pilot Study

    Directory of Open Access Journals (Sweden)

    Ataya, Ramsey

    2015-03-01

    Full Text Available Introduction: Establishing a boot camp curriculum is pertinent for emergency medicine (EM residents in order to develop proficiency in a large scope of procedures and leadership skills.  In this article, we describe our program’s EM boot camp curriculum as well as measure the confidence levels of resident physicians through a pre- and post-boot camp survey. Methods: We designed a one-month boot camp curriculum with the intention of improving the confidence, procedural performance, leadership, communication and resource management of EM interns. Our curriculum consisted of 12 hours of initial training and culminated in a two-day boot camp. The initial day consisted of clinical skill training and the second day included code drill scenarios followed by interprofessional debriefing.   Results: Twelve EM interns entered residency with an overall confidence score of 3.2 (1-5 scale across all surveyed skills. Interns reported the highest pre-survey confidence scores in suturing (4.3 and genitourinary exams (3.9. The lowest pre-survey confidence score was in thoracostomy (2.4. Following the capstone experience, overall confidence scores increased to 4.0. Confidence increased the most in defibrillation and thoracostomy. Additionally, all interns reported post-survey confidence scores of at least 3.0 in all skills, representing an internal anchor of “moderately confident/need guidance at times to perform procedure.” Conclusion: At the completion of the boot camp curriculum, EM interns had improvement in self-reported confidence across all surveyed skills and procedures. The described EM boot camp curriculum was effective, feasible and provided a foundation to our trainees during their first month of residency. [West J Emerg Med. 2015;16(2:356–361.

  18. Modeling the seismic response of 2D models of asteroid 433 Eros, based on the spectral-element method.

    Science.gov (United States)

    Blitz, Celine; Komatitsch, Dimitri; Lognonné, Philippe; Martin, Roland; Le Goff, Nicolas

    The understanding of the interior structure of Near Earth Objects (NEOs) is a fundamental issue to determine their evolution and origin, and also, to design possible mitigation techniques (Walker and Huebner, 2004). Indeed, if an oncoming Potentially Hazardous Object (PHO) were to threaten the Earth, numerous methods are suggested to prevent it from colliding our planet. Such mitigation techniques may involve nuclear explosives on or below the object surface, impact by a projectile, or concentration of solar energy using giant mirrors (Holsapple, 2004). The energy needed in such mitigation techniques highly depends on the porosity of the hazardous threatening object (asteroid or comet), as suggested by Holsapple, 2004. Thus, for a given source, the seismic response of a coherent homogeneous asteroid should be very different from the seismic response of a fractured or rubble-pile asteroid. To assess this hypothesis, we performed numerical simulations of wave propagation in different interior models of the Near Earth Asteroid 433 Eros. The simulations of wave propagation required a shape model of asteroid Eros, kindly provided by A. Cheng and O. Barnouin-Jha (personal communication). A cross-section along the longest axis has been chosen to define our 2D geometrical model, and we study two models of the interior: a homogeneous one, and a complex one characterized by fault networks below the main crosscut craters, and covered by a regolith layer of thickness ranging from 50 m to 150 m. To perform the numerical simulations we use the spectral-element method, which solves the variational weak form of the seismic wave equation (Komatitsch and Tromp, 1999) on the meshes of the 2D models of asteroid Eros. The homogeneous model is composed of an elastic material characterized by a pressure wave velocity Vp = 3000 m.s-1 , a shear wave velocity Vs = 1700 m.s-1 and a density of 2700 kg.m-3 . The fractured model possesses the same characteristics except for the presence of

  19. Students' Perceptions of the Long-Term Impact of Attending a "CSI Science Camp"

    Science.gov (United States)

    Yanowitz, Karen L.

    2016-07-01

    A science summer camp is a popular type of informal science experience for youth. While there is no one model of a science camp, these experiences typically allow for more focused and in-depth exploration of different science domains and are usually hands-on and participatory. The goal of this research was to examine the impact of a short science camp program approximately 1 year after students attended the camp. Overall, the results revealed that attending a 2-day forensic science camp had a positive and continuing influence on the participants. Students' science self-efficacy increased immediately after attending the camp and remained higher than pre-camp levels approximately 1 year later. Students were able to articulate why they believed the camp had a long-term impact on their lives. Furthermore, participants attributed a higher level of engaging in additional informal STEM-related activities during the academic year as a result of attending the camp.

  20. Students' Perceptions of the Long-Term Impact of Attending a "CSI Science Camp"

    Science.gov (United States)

    Yanowitz, Karen L.

    2016-12-01

    A science summer camp is a popular type of informal science experience for youth. While there is no one model of a science camp, these experiences typically allow for more focused and in-depth exploration of different science domains and are usually hands-on and participatory. The goal of this research was to examine the impact of a short science camp program approximately 1 year after students attended the camp. Overall, the results revealed that attending a 2-day forensic science camp had a positive and continuing influence on the participants. Students' science self-efficacy increased immediately after attending the camp and remained higher than pre-camp levels approximately 1 year later. Students were able to articulate why they believed the camp had a long-term impact on their lives. Furthermore, participants attributed a higher level of engaging in additional informal STEM-related activities during the academic year as a result of attending the camp.

  1. Activation of Estrogen Response Element-independent ERα signaling protects female mice from diet-induced obesity.

    Science.gov (United States)

    Yasrebi, Ali; Rivera, Janelle A; Krumm, Elizabeth A; Yang, Jennifer A; Roepke, Troy A

    2016-11-30

    17β-estradiol (E2) regulates central and peripheral mechanisms that control energy and glucose homeostasis predominantly through estrogen receptor α (ERα) acting via receptor binding to estrogen response elements (ERE). ERα signaling is also involved in mediating the effects of E2 on diet-induced obesity (DIO), although the roles of ERE-dependent and -independent ERα signaling in ameliorating the effects of DIO remain largely unknown. We hypothesize that ERE-dependent ERα signaling is necessary to ameliorate the effects of DIO. We addressed this question using ERαKO (KO) and ERαKIKO (KIKO) female mice; the latter expressing an ERα that lacks a functional ERE binding domain. Females were ovariectomized, fed low-fat (LFD) or high-fat (HFD) diet, and orally dosed with vehicle or estradiol benzoate (EB, 300 μg/kg). After 9 weeks, body composition, glucose and insulin tolerance, peptide hormone and inflammatory cytokine levels, and hypothalamic arcuate nucleus and liver gene expression were assessed. EB reduced body weight and body fat in WT, regardless of diet, and in HFD-fed KIKO, in part by reducing energy intake and feeding efficiency. EB reduced fasting glucose levels in KIKO mice fed both diets but augmented glucose tolerance only in HFD-fed KIKO. Plasma insulin and IL-6 were elevated in KIKO and KO compared to WT on a LFD. Expression of arcuate neuropeptide and receptor genes and liver fatty acid biosynthesis genes was altered by HFD and by EB through ERE-dependent and -independent mechanisms. Therefore, ERE-independent signaling mechanisms in both the brain and peripheral organs mediate, in part, the effects of E2 during DIO.

  2. Effect of iron stress on Withania somnifera L.: antioxidant enzyme response and nutrient elemental uptake of in vitro grown plants.

    Science.gov (United States)

    Rout, Jyoti Ranjan; Behera, Sadhana; Keshari, Nitin; Ram, Shidharth Sankar; Bhar, Subhajit; Chakraborty, Anindita; Sudarshan, Mathummal; Sahoo, Santi Lata

    2015-03-01

    In the present study the response of antioxidant enzyme activities and the level of expression of their corresponding genes on bioaccumulation of iron (Fe) were investigated. In vitro germinated Withania somnifera L. were grown in Murashige and Skoog's liquid medium with increasing concentrations (0, 25, 50, 100 and 200 µM) of FeSO4 for 7 and 14 days. Root and leaf tissues analyzed for catalase (CAT, EC 1.11.1.6), superoxide dismutase (SOD, EC 1.15.1.1) and guaiacol peroxidase (GPX, EC 1.11.1.7), have shown an increase in content with respect to exposure time. Isoforms of CAT, SOD and GPX were separated using non-denaturing polyacrylamide gel electrophoresis and observed that the isoenzymes were greatly affected by higher concentrations of Fe. Reverse transcriptase polymerase chain reaction analysis performed by taking three pairs of genes of CAT (RsCat, Catalase1, Cat1) and SOD (SodCp, TaSOD1.2, MnSOD) to find out the differential expression of antioxidant genes under Fe excess. RsCat from CAT and MnSOD from SOD have exhibited high levels of gene expression under Fe stress, which was consistent with the changes of the activity assayed in solution after 7 days of treatment. Analysis by proton induced X-ray emission exhibited an increasing uptake of Fe in plants by suppressing and expressing of other nutrient elements. The results of the present study suggest that higher concentration of Fe causes disturbance in nutrient balance and induces oxidative stress in plant.

  3. Transrepression of the estrogen receptor promoter by calcitriol in human breast cancer cells via two negative vitamin D response elements.

    Science.gov (United States)

    Swami, Srilatha; Krishnan, Aruna V; Peng, Lihong; Lundqvist, Johan; Feldman, David

    2013-08-01

    Calcitriol (1,25-dihydroxyvitamin D3), the hormonally active metabolite of vitamin D, exerts its anti-proliferative activity in breast cancer (BCa) cells by multiple mechanisms including the downregulation of the expression of estrogen receptor α (ER). We analyzed an ∼3.5 kb ER promoter sequence and demonstrated the presence of two potential negative vitamin D response elements (nVDREs), a newly identified putative nVDRE upstream at -2488 to -2473 bp (distal nVDRE) and a previously published sequence (proximal nVDRE) at -94 to -70 bp proximal to the P1 start site. Transactivation analysis using ER promoter deletion constructs and heterologous promoter-reporter constructs revealed that both nVDREs functioned to mediate calcitriol transrepression. In the electrophoretic mobility shift assay, the vitamin D receptor (VDR) showed strong binding to both nVDREs in the presence of calcitriol, and the chromatin immunoprecipitation assay demonstrated the recruitment of the VDR to the distal nVDRE site. Mutations in the 5' hexameric DNA sequence of the distal nVDRE resulted in the loss of calcitriol-mediated transrepression and the inhibition of protein-DNA complex formation, demonstrating the importance of these nucleotides in VDR DNA binding and transrepression. A putative nuclear factor-Y (NFY) binding site, identified within the distal nVDRE, led to the findings that NFY bound to the distal nVDRE site interfered with the binding of the VDR at the site and reduced calcitriol-mediated transrepression. In conclusion, the ER promoter region contains two negative VDREs that act in concert to bind to the VDR and both nVDREs are required for the maximal inhibition of ER expression by calcitriol. The suppression of ER expression and estrogen-mediated signaling by calcitriol in BCa cells suggests that vitamin D may be useful in the treatment of ER+ BCa.

  4. Soil solution chemistry and element fluxes in three European heathlands and their responses to warming and drought

    DEFF Research Database (Denmark)

    Schmidt, I.K.; Tietema, A.; Williams, D.;

    2004-01-01

    in the first year, but, because of high retention of N in the vegetation or mineral soil, there were no significant effects of warming on seepage water NO3-N and NH4-N. Retention of P was high at all three sites. In several cases, drought increased concentrations of elements momentarily, but element fluxes...

  5. Anxiety and depression with neurogenesis defects in exchange protein directly activated by cAMP 2-deficient mice are ameliorated by a selective serotonin reuptake inhibitor, Prozac

    Science.gov (United States)

    Zhou, L; Ma, S L; Yeung, P K K; Wong, Y H; Tsim, K W K; So, K F; Lam, L C W; Chung, S K

    2016-01-01

    Intracellular cAMP and serotonin are important modulators of anxiety and depression. Fluoxetine, a selective serotonin reuptake inhibitor (SSRI) also known as Prozac, is widely used against depression, potentially by activating cAMP response element-binding protein (CREB) and increasing brain-derived neurotrophic factor (BDNF) through protein kinase A (PKA). However, the role of Epac1 and Epac2 (Rap guanine nucleotide exchange factors, RAPGEF3 and RAPGEF4, respectively) as potential downstream targets of SSRI/cAMP in mood regulations is not yet clear. Here, we investigated the phenotypes of Epac1 (Epac1−/−) or Epac2 (Epac2−/−) knockout mice by comparing them with their wild-type counterparts. Surprisingly, Epac2−/− mice exhibited a wide range of mood disorders, including anxiety and depression with learning and memory deficits in contextual and cued fear-conditioning tests without affecting Epac1 expression or PKA activity. Interestingly, rs17746510, one of the three single-nucleotide polymorphisms (SNPs) in RAPGEF4 associated with cognitive decline in Chinese Alzheimer's disease (AD) patients, was significantly correlated with apathy and mood disturbance, whereas no significant association was observed between RAPGEF3 SNPs and the risk of AD or neuropsychiatric inventory scores. To further determine the detailed role of Epac2 in SSRI/serotonin/cAMP-involved mood disorders, we treated Epac2−/− mice with a SSRI, Prozac. The alteration in open field behavior and impaired hippocampal cell proliferation in Epac2−/− mice were alleviated by Prozac. Taken together, Epac2 gene polymorphism is a putative risk factor for mood disorders in AD patients in part by affecting the hippocampal neurogenesis. PMID:27598965

  6. Lagrangian three-dimensional finite-element formulation for the nonlinear fluid-structural response of reactor components. [LMFBR

    Energy Technology Data Exchange (ETDEWEB)

    Kulak, R. F.; Fiala, C.

    1980-03-01

    This report presents the formulations used in the NEPTUNE code. Specifically, it describes the finite-element formulation of a three-dimensional hexahedral element for simulating the behavior of either fluid or solid continua. Since the newly developed hexahedral element and the original triangular plate element are finite elements, they are compatible in the sense that they can be combined arbitrarily to simulate complex reactor components in three-dimensional space. Because rate-type constitutive relations are used in conjunction with a velocity-strain tensor, the formulation is applicable to large deformation problems. This development can be used to simulate (1) the fluid adjacent to reactor components and (2) the concrete fill found in large reactor head closures.

  7. Stress and glucocorticoids impair memory retrieval via β2-adrenergic, Gi/o-coupled suppression of cAMP signaling.

    Science.gov (United States)

    Schutsky, Keith; Ouyang, Ming; Castelino, Christina B; Zhang, Lei; Thomas, Steven A

    2011-10-05

    Acute stress impairs the retrieval of hippocampus-dependent memory, and this effect is mimicked by exogenous administration of stress-responsive glucocorticoid hormones. It has been proposed that glucocorticoids affect memory by promoting the release and/or blocking the reuptake of norepinephrine (NE), a stress-responsive neurotransmitter. It has also been proposed that this enhanced NE signaling impairs memory retrieval by stimulating β(1)-adrenergic receptors and elevating levels of cAMP. In contrast, other evidence indicates that NE, β(1), and cAMP signaling is transiently required for the retrieval of hippocampus-dependent memory. To resolve this discrepancy, wild-type rats and mice with and without gene-targeted mutations were stressed or treated with glucocorticoids and/or adrenergic receptor drugs before testing memory for inhibitory avoidance or fear conditioning. Here we report that glucocorticoids do not require NE to impair retrieval. However, stress- and glucocorticoid-induced impairments of retrieval depend on the activation of β(2) (but not β(1))-adrenergic receptors. Offering an explanation for the opposing functions of these two receptors, the impairing effects of stress, glucocorticoids and β(2) agonists on retrieval are blocked by pertussis toxin, which inactivates signaling by G(i/o)-coupled receptors. In hippocampal slices, β(2) signaling decreases cAMP levels and greatly reduces the increase in cAMP mediated by β(1) signaling. Finally, augmenting cAMP signaling in the hippocampus prevents the impairment of retrieval by systemic β(2) agonists or glucocorticoids. These results demonstrate that the β(2) receptor can be a critical effector of acute stress, and that β(1) and β(2) receptors can have quite distinct roles in CNS signaling and cognition.

  8. Sevoflurane effects on cyclic adenosine monophosphate response element binding protein, phosphorylated cyclic adenosine monophosphate response element binding protein, and Livin expression in the cortex and hippocampus of a vascular cognitive impairment rat model

    Institute of Scientific and Technical Information of China (English)

    Bin Wu; Ling Dan; Xianlin Zhu

    2009-01-01

    BACKGROUND: Neuronal necrosis and apoptosis play important roles in the pathophysiology of cerebral ischemia and resulting cognitive impairment. However, inhibition of neuronal necrosis and apoptosis has been shown to attenuate cognitive impairment following cerebral ischemia.OBJECTIVE: To investigate the effects of sevoflurane on cyclic adenosine monophosphate response element binding protein (CREB), phosphorylated CREB (pCREB), and Livin expression in the cortex and hippocampus of a rat model of vascular cognitive impairment.DESIGN, TIME AND SETTING: A randomized, controlled experiment was performed in the Chongqing Key Laboratory of Neurology between June 2007 and July 2008.MATERIALS: Sevoflurane was provided by Abbott Laboratory, UK; Morris water maze was provided by Chinese Academy of Medical Sciences, China; goat anti-rat CREB, goat anti-rat pCREB and goat anti-rat Livin antibodies were provided by Biosource International, USA.METHODS: A total of 42 female, Wistar rats were randomly assigned to the following groups: sham operation, vascular cognitive impairment, and sevoflurane treatment. The vascular cognitive impairment rat model was established by permanent bilateral occlusion of both common carotid arteries, and 1.0 MAC sevoflurane was immediately administered by inhalation for 2 hours.MAIN OUTCOME MEASURES: CREB, pCREB, and Livin expression was measured in the cortex and hippocampus by Western blot and reverse transcription-polymerase chain reaction. Behavior was evaluated with Morris water maze.RESULTS: CREB, pCREB, and Livin expression in the sevoflurane treatment group was significantly greater than the vascular cognitive impairment group (P<0.01). However, expression of CREB and pCREB was significantly less in the sevoflurane treatment and vascular cognitive impairment groups, compared with the sham operation group (P<0.01). Livin expression in the sevoflurane treatment and vascular cognitive impairment groups was significantly greater than the sham

  9. Advances in Pediatric Cardiology Boot Camp: Boot Camp Training Promotes Fellowship Readiness and Enables Retention of Knowledge.

    Science.gov (United States)

    Ceresnak, Scott R; Axelrod, David M; Sacks, Loren D; Motonaga, Kara S; Johnson, Emily R; Krawczeski, Catherine D

    2017-03-01

    We previously demonstrated that a pediatric cardiology boot camp can improve knowledge acquisition and decrease anxiety for trainees. We sought to determine if boot camp participants entered fellowship with a knowledge advantage over fellows who did not attend and if there was moderate-term retention of that knowledge. A 2-day training program was provided for incoming pediatric cardiology fellows from eight fellowship programs in April 2016. Hands-on, immersive experiences and simulations were provided in all major areas of pediatric cardiology. Knowledge-based examinations were completed by each participant prior to boot camp (PRE), immediately post-training (POST), and prior to the start of fellowship in June 2016 (F/U). A control group of fellows who did not attend boot camp also completed an examination prior to fellowship (CTRL). Comparisons of scores were made for individual participants and between participants and controls. A total of 16 participants and 16 control subjects were included. Baseline exam scores were similar between participants and controls (PRE 47 ± 11% vs. CTRL 52 ± 10%; p = 0.22). Participants' knowledge improved with boot camp training (PRE 47 ± 11% vs. POST 70 ± 8%; p < 0.001) and there was excellent moderate-term retention of the information taught at boot camp (PRE 47 ± 11% vs. F/U 71 ± 8%; p < 0.001). Testing done at the beginning of fellowship demonstrated significantly better scores in participants versus controls (F/U 71 ± 8% vs. CTRL 52 ± 10%; p < 0.001). Boot camp participants demonstrated a significant improvement in basic cardiology knowledge after the training program and had excellent moderate-term retention of that knowledge. Participants began fellowship with a larger fund of knowledge than those fellows who did not attend.

  10. Evaluating the Effectiveness of the General Surgery Intern Boot Camp.

    Science.gov (United States)

    Schoolfield, Clint S; Samra, Navdeep; Kim, Roger H; Shi, Runhua; Zhang, Wayne W; Tan, Tze-Woei

    2016-03-01

    The aim of our study is to evaluate the effectiveness of newly implemented general surgery intern boot camp. A 2-day didactic and skills-based intern boot camp was implemented before the start of clinical duties. Participants who did not attend all boot camp activities and had prior postgraduate training were excluded. A survey utilizing a 5-point Likert scale scoring system was used to assess the participants' confidence to perform intern-level tasks before and after the boot camp. Subgroup analyses were performed comparing changes in confidence among graduates from home institution versus others and general surgery versus other subspecialties. In the analysis, 21 participants over two years were included. Among them, 7 were graduates from home institution (4 general surgery, 3 subspecialty) and 14 were from other institutions (6 general surgery and 8 subspecialty). There were significant increases in overall confidence levels (pre = 2.79 vs post = 3.43, P surgery (2.78 vs 3.46, P = 0.001) and other specialties (2.74 vs 3.34, P surgery intern boot camp before the start of official rotation is effective in improving confidence level in performing level-appropriate tasks of the incoming new interns.

  11. The MluI cell cycle box (MCB) motifs, but not damage-responsive elements (DREs), are responsible for the transcriptional induction of the rhp51+ gene in response to DNA replication stress.

    Science.gov (United States)

    Sartagul, Wugangerile; Zhou, Xin; Yamada, Yuki; Ma, Ning; Tanaka, Katsunori; Furuyashiki, Tomoyuki; Ma, Yan

    2014-01-01

    DNA replication stress induces the transcriptional activation of rhp51+, a fission yeast recA homolog required for repair of DNA double strand breaks. However, the mechanism by which DNA replication stress activates rhp51+ transcription is not understood. The promoter region of rhp51+ contains two damage-responsive elements (DREs) and two MluI cell cycle box (MCB) motifs. Using luciferase reporter assays, we examined the role of these elements in rhp51+ transcription. The full-length rhp51+ promoter and a promoter fragment containing MCB motifs only, but not a fragment containing DREs, mediated transcriptional activation upon DNA replication stress. Removal of the MCB motifs from the rhp51+ promoter abolished the induction of rhp51+ transcription by DNA replication stress. Consistent with a role for MCB motifs in rhp51+ transcription activation, deletion of the MBF (MCB-binding factor) co-repressors Nrm1 and Yox1 precluded rhp51+ transcriptional induction in response to DNA replication stress. Using cells deficient in checkpoint signaling molecules, we found that the Rad3-Cds1/Chk1 pathway partially mediated rhp51+ transcription in response to DNA replication stress, suggesting the involvement of unidentified checkpoint signaling pathways. Because MBF is critical for G1/S transcription, we examined how the cell cycle affected rhp51+ transcription. The transcription of rhp51+ and cdc18+, an MBF-dependent G1/S gene, peaked simultaneously in synchronized cdc25-22 cells. Furthermore, DNA replication stress maintained transcription of rhp51+ similarly to cdc18+. Collectively, these results suggest that MBF and its regulators mediate rhp51+ transcription in response to DNA replication stress, and underlie rhp51+ transcription at the G1/S transition.

  12. Preliminary Outcomes from a Week-Long Environmental Engineering Summer Camp for High School Female Students

    Science.gov (United States)

    Balasubramanian, S.; Koloutsou-Vakakis, S.

    2014-12-01

    There is a need for environment engineers and sustainability managers to address global environmental, energy and health challenges. Environmental literacy programs at K-12 level provide a unique opportunity in motivating young minds in joining STEM and also provide additional value in learning about "saving planet earth". The Women in Engineering at the University of Illinois organize an annual week long camp, for female high school students with tracks corresponding to different fields of Engineering. The Environmental Engineering and Sustainability (EES) track is organized by faculty and graduate students of the Civil and Environmental Engineering department and introduces students to concepts in sustainability and systems thinking in connection with air and water quality, climate change and renewable energy. This study is a preliminary assessment of the relevance of the EES outreach track conducted in July 2014 in student learning. Specific goals include assessing (a) demographics of participants and their motivation to join this camp, (b) educational and enjoyability quotients of the modules and (c) learning and motivational outcomes using the Likert scale. A pre-camp survey indicated keen interest in learning about environmental engineering (4.56/5.0) and expected this camp to be a venue to learn about related career choices (4.9/5.0). Five days of instruction were divided thematically and included a mix of lectures, activity based learning, demonstrations and field visits. Overall modules were rated as educational (4.4/5.0) and enjoyable (4.5/5.0). Modules with hands-on learning were best received (4.67/5.0) and rated unique (4.7/5.0). Post camp, participants acknowledged the important contribution of environmental engineers to society (4.8/5.0) and could relate the different modules to the role engineer's play (4.06/5.0) for sustainability. On an average, the participants evinced interest in engineering as a career choice (4.0/5.0) but there was a broader

  13. Direct Light-up of cAMP Derivatives in Living Cells by Click Reactions

    Directory of Open Access Journals (Sweden)

    Yan Xu

    2013-10-01

    Full Text Available 8-Azidoadenosine 3′,5′-cyclic monophosphate (8-azido cAMP was directly detected in living cells, by applying Cu-free azide-alkyne cycloaddition to probe cAMP derivatives by fluorescence light-up. Fluorescence emission was generated by two non-fluorescent molecules, 8-azido cAMP as a model target and difluorinated cyclooctyne (DIFO reagent as a probe. The azide-alkyne cycloaddition reaction between 8-azido cAMP and DIFO induces fluorescence in 8-azido cAMP. The fluorescence emission serves as a way to probe 8-azido cAMP in cells.

  14. Offering a Forensic Science Camp To Introduce and Engage High School Students in Interdisciplinary Science Topics

    DEFF Research Database (Denmark)

    Ahrenkiel, Linda; Worm-Leonhard, Martin

    2014-01-01

    In this article, we present details of a one-week interdisciplinary science camp for high school students in Denmark, “Criminal Camp”. We describe the use of forensic science and simulated crimes as a common foundation for teaching the theory and practice of concepts in chemistry, physics......’ attitudes toward science in general and the applications within forensic science in particular. From the free-response answers given in the survey, it was furthermore inferred that the participants enjoyed working with science in an interdisciplinary context, and that they gained both concrete knowledge...

  15. Physiological and Molecular Effects of the Cyclic Nucleotides cAMP and cGMP on Arabidopsis thaliana

    KAUST Repository

    Herrera, Natalia M.

    2012-12-01

    The cyclic nucleotide monophosphates (CNs), cAMP and cGMP, are second messengers that participate in the regulation of development, metabolism and adaptive responses. In plants, CNs are associated with the control of pathogen responses, pollen tube orientation, abiotic stress response, membrane transport regulation, stomatal movement and light perception. In this study, we hypothesize that cAMP and cGMP promote changes in the transcription level of genes related to photosynthesis, high light and membrane transport in Arabidopsis thaliana leaves and, that these changes at the molecular level can have functional biological consequences. For this reason we tested if CNs modulate the photosynthetic rate, responses to high light and root ion transport. Real time quantitative PCR was used to assess transcription levels of selected genes and infrared gas analyzers coupled to fluorescence sensors were used to measure the photosynthetic parameters. We present evidence that both cAMP and cGMP modulate foliar mRNA levels early after stimulation. The two CNs trigger different responses indicating that the signals have specificity. A comparison of proteomic and transcriptional changes suggest that both transcriptional and post-transcriptional mechanisms are modulated by CNs. cGMP up-regulates the mRNA levels of components of the photosynthesis and carbon metabolism. However, neither cAMP nor cGMP trigger differences in the rate of carbon assimilation, maximum efficiency of the photosystem II (PSII), or PSII operating efficiency. It was also demonstrated that CN regulate the expression of its own targets, the cyclic nucleotide gated channels - CNGC. Further studies are needed to identify the components of the signaling transduction pathway that mediate cellular changes and their respective regulatory and/or signaling roles.

  16. Intracellular cAMP signaling by soluble adenylyl cyclase.

    Science.gov (United States)

    Tresguerres, Martin; Levin, Lonny R; Buck, Jochen

    2011-06-01

    Soluble adenylyl cyclase (sAC) is a recently identified source of the ubiquitous second messenger cyclic adenosine 3',5' monophosphate (cAMP). sAC is distinct from the more widely studied source of cAMP, the transmembrane adenylyl cyclases (tmACs); its activity is uniquely regulated by bicarbonate anions, and it is distributed throughout the cytoplasm and in cellular organelles. Due to its unique localization and regulation, sAC has various functions in a variety of physiological systems that are distinct from tmACs. In this review, we detail the known functions of sAC, and we reassess commonly held views of cAMP signaling inside cells.

  17. Investigation of Sylvatic Typhus at a Wilderness Camp

    Centers for Disease Control (CDC) Podcasts

    2009-06-30

    In this podcast, Dr. Greg Dasch discusses an outbreak of four cases of sylvatic typhus that occurred at a wilderness camp in Pennsylvania. Sylvatic typhus is very rare in the United States, with only 41 cases since it was discovered in the United States in 1975. Lab work at CDC and the discovery that all four camp counselors who became ill had slept in the same bunk at the camp between 2004 and 2006 ultimately led to confirmation that flying squirrels living in the wall of the cabin were to blame for the illnesses.  Created: 6/30/2009 by Emerging Infectious Diseases.   Date Released: 6/30/2009.

  18. Vitamin D Responsive Elements within the HLA-DRB1 Promoter Region in Sardinian Multiple Sclerosis Associated Alleles

    Science.gov (United States)

    Murru, Maria Rita; Corongiu, Daniela; Tranquilli, Stefania; Fadda, Elisabetta; Murru, Raffaele; Schirru, Lucia; Secci, Maria Antonietta; Costa, Gianna; Asunis, Isadora; Cuccu, Stefania; Fenu, Giuseppe; Lorefice, Lorena; Carboni, Nicola; Mura, Gioia; Rosatelli, Maria Cristina; Marrosu, Maria Giovanna

    2012-01-01

    Vitamin D response elements (VDREs) have been found in the promoter region of the MS-associated allele HLA-DRB1*15∶01, suggesting that with low vitamin D availability VDREs are incapable of inducing *15∶01 expression allowing in early life autoreactive T-cells to escape central thymic deletion. The Italian island of Sardinia exhibits a very high frequency of MS and high solar radiation exposure. We test the contribution of VDREs analysing the promoter region of the MS-associated DRB1 *04∶05, *03∶01, *13∶01 and *15∶01 and non-MS-associated *16∶01, *01, *11, *07∶01 alleles in a cohort of Sardinians (44 MS patients and 112 healthy subjects). Sequencing of the DRB1 promoter region revealed a homozygous canonical VDRE in all *15∶01, *16∶01, *11 and in 45/73 *03∶01 and in heterozygous state in 28/73 *03∶01 and all *01 alleles. A new mutated homozygous VDRE was found in all *13∶03, *04∶05 and *07∶01 alleles. Functionality of mutated and canonical VDREs was assessed for its potential to modulate levels of DRB1 gene expression using an in vitro transactivation assay after stimulation with active vitamin D metabolite. Vitamin D failed to increase promoter activity of the *04∶05 and *03∶01 alleles carrying the new mutated VDRE, while the *16∶01 and *03∶01 alleles carrying the canonical VDRE sequence showed significantly increased transcriptional activity. The ability of VDR to bind the mutant VDRE in the DRB1 promoter was evaluated by EMSA. Efficient binding of VDR to the VDRE sequence found in the *16∶01 and in the *15∶01 allele reduced electrophoretic mobility when either an anti-VDR or an anti-RXR monoclonal antibody was added. Conversely, the Sardinian mutated VDRE sample showed very low affinity for the RXR/VDR heterodimer. These data seem to exclude a role of VDREs in the promoter region of the DRB1 gene in susceptibility to MS carried by DRB1* alleles in Sardinian patients. PMID:22848563

  19. Element Selective Probe of the Ultra-Fast Magnetic Response to an Element Selective Excitation in Fe-Ni Compounds Using a Two-Color FEL Source

    Directory of Open Access Journals (Sweden)

    Eugenio Ferrari

    2017-01-01

    Full Text Available The potential of the two-color mode implemented at the FERMI free-electron laser (FEL source for pumping and probing selectively different atomic species has been demonstrated by time-resolved scattering experiments with permalloy (FeNi alloy and NiFe2O4 samples. We monitored the ultra-fast demagnetization of Ni induced by the pump FEL pulse, by tuning the linearly-polarized FEL probe pulse to the Ni-3p resonance and measuring the scattered intensity in the transverse magneto-optical Kerr effect geometry. The measurements were performed by varying the intensity of the FEL pump pulse, tuning its wavelength to and off of the Fe-3p resonance, and by spanning the FEL probe pulse delays across the 300–900 fs range. The obtained results have evidenced that for the case of NiFe2O4, there is a sensible difference in the magnetic response at the Ni site when the pump pulse causes electronic excitations at the Fe site.

  20. Control of βAR- and N-methyl-D-aspartate (NMDA) Receptor-Dependent cAMP Dynamics in Hippocampal Neurons.

    Science.gov (United States)

    Chay, Andrew; Zamparo, Ilaria; Koschinski, Andreas; Zaccolo, Manuela; Blackwell, Kim T

    2016-02-01

    Norepinephrine, a neuromodulator that activates β-adrenergic receptors (βARs), facilitates learning and memory as well as the induction of synaptic plasticity in the hippocampus. Several forms of long-term potentiation (LTP) at the Schaffer collateral CA1 synapse require stimulation of both βARs and N-methyl-D-aspartate receptors (NMDARs). To understand the mechanisms mediating the interactions between βAR and NMDAR signaling pathways, we combined FRET imaging of cAMP in hippocampal neuron cultures with spatial mechanistic modeling of signaling pathways in the CA1 pyramidal neuron. Previous work implied that cAMP is synergistically produced in the presence of the βAR agonist isoproterenol and intracellular calcium. In contrast, we show that when application of isoproterenol precedes application of NMDA by several minutes, as is typical of βAR-facilitated LTP experiments, the average amplitude of the cAMP response to NMDA is attenuated compared with the response to NMDA alone. Models simulations suggest that, although the negative feedback loop formed by cAMP, cAMP-dependent protein kinase (PKA), and type 4 phosphodiesterase may be involved in attenuating the cAMP response to NMDA, it is insufficient to explain the range of experimental observations. Instead, attenuation of the cAMP response requires mechanisms upstream of adenylyl cyclase. Our model demonstrates that Gs-to-Gi switching due to PKA phosphorylation of βARs as well as Gi inhibition of type 1 adenylyl cyclase may underlie the experimental observations. This suggests that signaling by β-adrenergic receptors depends on temporal pattern of stimulation, and that switching may represent a novel mechanism for recruiting kinases involved in synaptic plasticity and memory.

  1. Control of βAR- and N-methyl-D-aspartate (NMDA Receptor-Dependent cAMP Dynamics in Hippocampal Neurons.

    Directory of Open Access Journals (Sweden)

    Andrew Chay

    2016-02-01

    Full Text Available Norepinephrine, a neuromodulator that activates β-adrenergic receptors (βARs, facilitates learning and memory as well as the induction of synaptic plasticity in the hippocampus. Several forms of long-term potentiation (LTP at the Schaffer collateral CA1 synapse require stimulation of both βARs and N-methyl-D-aspartate receptors (NMDARs. To understand the mechanisms mediating the interactions between βAR and NMDAR signaling pathways, we combined FRET imaging of cAMP in hippocampal neuron cultures with spatial mechanistic modeling of signaling pathways in the CA1 pyramidal neuron. Previous work implied that cAMP is synergistically produced in the presence of the βAR agonist isoproterenol and intracellular calcium. In contrast, we show that when application of isoproterenol precedes application of NMDA by several minutes, as is typical of βAR-facilitated LTP experiments, the average amplitude of the cAMP response to NMDA is attenuated compared with the response to NMDA alone. Models simulations suggest that, although the negative feedback loop formed by cAMP, cAMP-dependent protein kinase (PKA, and type 4 phosphodiesterase may be involved in attenuating the cAMP response to NMDA, it is insufficient to explain the range of experimental observations. Instead, attenuation of the cAMP response requires mechanisms upstream of adenylyl cyclase. Our model demonstrates that Gs-to-Gi switching due to PKA phosphorylation of βARs as well as Gi inhibition of type 1 adenylyl cyclase may underlie the experimental observations. This suggests that signaling by β-adrenergic receptors depends on temporal pattern of stimulation, and that switching may represent a novel mechanism for recruiting kinases involved in synaptic plasticity and memory.

  2. Hydrogen sulfide inhibits A2A adenosine receptor agonist induced β-amyloid production in SH-SY5Y neuroblastoma cells via a cAMP dependent pathway.

    Directory of Open Access Journals (Sweden)

    Bhushan Vijay Nagpure

    Full Text Available Alzheimer's disease (AD is the leading cause of senile dementia in today's society. Its debilitating symptoms are manifested by disturbances in many important brain functions, which are influenced by adenosine. Hence, adenosinergic system is considered as a potential therapeutic target in AD treatment. In the present study, we found that sodium hydrosulfide (NaHS, an H2S donor, 100 µM attenuated HENECA (a selective A2A receptor agonist, 10-200 nM induced β-amyloid (1-42 (Aβ42 production in SH-SY5Y cells. NaHS also interfered with HENECA-stimulated production and post-translational modification of amyloid precursor protein (APP by inhibiting its maturation. Measurement of the C-terminal APP fragments generated from its enzymatic cleavage by β-site amyloid precursor protein cleaving enzyme 1 (BACE1 showed that NaHS did not have any significant effect on β-secretase activity. However, the direct measurements of HENECA-elevated γ-secretase activity and mRNA expressions of presenilins suggested that the suppression of Aβ42 production in NaHS pretreated cells was mediated by inhibiting γ-secretase. NaHS induced reductions were accompanied by similar decreases in intracellular cAMP levels and phosphorylation of cAMP responsive element binding protein (CREB. NaHS significantly reduced the elevated cAMP and Aβ42 production caused by forskolin (an adenylyl cyclase, AC agonist alone or forskolin in combination with IBMX (a phosphodiesterase inhibitor, but had no effect on those caused by IBMX alone. Moreover, pretreatment with NaHS significantly attenuated HENECA-elevated AC activity and mRNA expressions of various AC isoforms. These data suggest that NaHS may preferentially suppress AC activity when it was stimulated. In conclusion, H2S attenuated HENECA induced Aβ42 production in SH-SY5Y neuroblastoma cells through inhibiting γ-secretase via a cAMP dependent pathway.

  3. Molecular modifications by regulating cAMP signaling and oxidant-antioxidant defence mechanisms, produce antidepressant-like effect: A possible mechanism of etazolate aftermaths of impact accelerated traumatic brain injury in rat model.

    Science.gov (United States)

    Jindal, Ankur; Mahesh, Radhakrishnan; Bhatt, Shvetank; Pandey, Dilip

    2016-12-14

    Traumatic brain injury (TBI) is one of the leading cause of psychiatric conditions in patients, amongst which, depression and anxiety are more frequent. Despite the preclinical antidepressant-like effects, clinical development of Phospodiesterase-4 (PDE4) enzyme inhibitors has been hampered due to serious side effect profiles, such as nausea and vomiting. Etazolate (ETZ) is a new generation PDE4 inhibitor with encouraging safety and tolerance profiles. In our previous studies we have addressed that ETZ produces antidepressant-like effects in animal models of depression, however, the underlying mechanism(s) following TBI have not been completely explored. Impact accelerated TBI by weight drop method causes depression-like behavioral deficits in modified open field exploration, hyper-emotionality and sucrose consumption paradigms. TBI not only causes immediate mechanical damage to the brain, but also induces biochemical changes that lead to delayed neural cell loss leading to a secondary injury. The present study examines the antidepressant effects of ETZ on the TBI-induced depression-like behavior deficits and attempts to explore the underlying mechanism. In order to understand the underlying pathology of TBI and mechanism(s) of ETZ in TBI molecular markers namely, brain cAMP, cAMP response element binding protein (pCREB) and brain-derived neurotrophic factor (BDNF) were estimated. Additionally, the level of oxidative (lipid peroxidation) & nitrosative (nitrite) stress markers, along with antioxidant enzymes markers, such as, reduced glutathione (GSH), superoxide dismutase (SOD) and catalase (CAT) were measured. Furthermore, the involvement of hypothalamic-pituitary adrenal (HPA) axis activity in underlying mechanism was also investigated by measuring serum corticosterone (CORT) level. The results revealed that TBI significantly altered cAMP, pCREB and BDNF levels. Moreover, a significant increase in oxidative-nitrosative stress markers levels, while, significant

  4. Rebuilding Jewish identities in Displaced Persons Camps in Germany

    Directory of Open Access Journals (Sweden)

    Françoise Ouzan

    2007-10-01

    Full Text Available In the summer 1945, Displaced Persons camps in Germany epitomized a place of contrasts and paradoxes. DPs still languished behind barbed wires after the Allied armies had liberated the concentration camps. The military had assumed that practically all of the Displaced Persons would be sent to their countries of origin. In the spring and summer 1945, 65 000 DPs were sent back home every day and almost six million were repatriated in September 1945. Accurate statistics are impossible, yet, acco...

  5. Science Camp - lystigt eller lærerigt

    DEFF Research Database (Denmark)

    Ahrenkiel, Linda; Albrechtsen, Thomas S. R.

    2013-01-01

    I oplægget vil vi undersøge fænomenet Science Camps nærmere ved at fortælle om dets historiske udvikling og ikke mindst lægge op til en diskussion af en definition. Derudover vil vi præsentere en case, hvor der med udgangspunkt i et aktuelt ph.d.-projekt er blevet undersøgt, hvad deltagerne får ud...... af at deltage i en science camp: Kan man både vække begejstring og medvirke til læring?...

  6. "Camping up" self-esteem in children with hemophilia.

    Science.gov (United States)

    Thomas, D; Gaslin, T C

    2001-01-01

    Children with hemophilia have often been viewed at greater risk for altered self-esteem than their healthy counterparts. Our article shares the positive effects of the camp experience on children with hemophilia and subsequent enhancement of self-esteem. Interaction and support in the camp environment provide an opportunity for these children to gain independence and "prove" their self-worth and ability. Previous literature has provided a variety of findings on the relationship between chronic illness, such as hemophilia, and self-esteem alterations. We identify many opportunities for future education and research to provide quality nursing support to this unique population.

  7. EduCamp Colombia: Social Networked Learning for Teacher Training

    Directory of Open Access Journals (Sweden)

    Diego Ernesto Leal Fonseca

    2011-03-01

    Full Text Available This paper describes a learning experience called EduCamp, which was launched by the Ministry of Education of Colombia in 2007, based on emerging concepts such as e-Learning 2.0, connectivism, and personal learning environments. An EduCamp proposes an unstructured collective learning experience, which intends to make palpable the possibilities of social software tools in learning and interaction processes while demonstrating face-to-face organizational forms that reflect social networked learning ideas. The experience opens new perspectives for the design of technology training workshops and for the development of lifelong learning experiences.

  8. Science Skills Boot Camp Gets Interns Ready for Research | Poster

    Science.gov (United States)

    By Ashley DeVine, Staff Writer Summer interns learned how to read a scientific paper, present a poster, maintain a laboratory notebook, and much more, at the Science Skills Boot Camp in June. “It was a great experience, and it was a great opportunity to meet some of the other interns also working on the campus,” said Alyssa Klein, a Werner H. Kirsten student intern in the Cellular Immunology Group, Laboratory of Molecular Immunoregulation. “The boot camp covered many topics essential to being a good scientist and science researcher.”

  9. Camp as a Teaching Method in Health Education

    DEFF Research Database (Denmark)

    Ringby, Betina

    methodology and theories/methods put INTO action. The camp method encourages a student-participatory and an inter-professionally approach required to think out-of-the-box. Teachers were offered the possibility to be mentor/coach for students. ‘Effectuation’, the ‘PUSH model’ and the ‘Entrepreneurial...... education to support students in gaining innovative and entrepreneurial skills. Participants A total of 33 physiotherapist students each participated in one of three CAMPS of 48, 24 or 12 hours in an elective module named “Sport, innovation and entrepreneurship”. Methods The project was based on case...

  10. Promoting independence in adolescent paraplegics: a 2-week "camping" experience.

    Science.gov (United States)

    Bodzioch, J; Roach, J W; Schkade, J

    1986-01-01

    In the summer of 1982, Texas Scottish Rite Hospital (Dallas, TX, U.S.A.) sponsored a camp for paraplegic adolescents. Six patients, three boys and three girls 14-17 years of age, participated in a 2-week program that was designed to improve their self-esteem, independence, and eventual employability. In their pre- and postcamp psychological evaluations, the campers demonstrated improvement in social skills and self-concept testing as compared with the scores of a matched control group, although this improvement did not reach statistical significance. We believe the camp was immensely successful, an opinion that was shared by both the campers and their parents.

  11. Aging has the opposite effect on cAMP and cGMP circadian variations in rat Leydig cells.

    Science.gov (United States)

    Baburski, Aleksandar Z; Sokanovic, Srdjan J; Andric, Silvana A; Kostic, Tatjana S

    2016-12-03

    The Leydig cell physiology displays a circadian rhythm driven by a complex interaction of the reproductive axis hormones and circadian system. The final output of this regulatory process is circadian pattern of steroidogenic genes expression and testosterone production. Aging gradually decreases robustness of rhythmic testosterone secretion without change in pattern of LH secretion. Here, we analyzed effect of aging on circadian variation of cAMP and cGMP signaling in Leydig cells. Results showed opposite effect of aging on cAMP and cGMP daily variation. Reduced amplitude of cAMP circadian oscillation was probably associated with changed expression of genes involved in cAMP production (increased circadian pattern of Adcy7, Adcy9, Adcy10 and decreased Adcy3); cAMP degradation (increased Pde4a, decreased Pde8b, canceled rhythm of Pde4d, completely reversed circadian pattern of Pde7b and Pde8a); and circadian expression of protein kinase A subunits (Prkac/PRKAC and Prkar2a). Aging stimulates expression of genes responsible for cGMP production (Nos2, Gucy1a3 and Gucy1b3/GUCYB3) and degradation (Pde5a, Pde6a and Pde6h) but the overall net effect is elevation of cGMP circadian oscillations in Leydig cells. In addition, the expression of cGMP-dependent kinase, Prkg1/PRKG1 is up-regulated. It seems that aging potentiate cGMP- and reduce cAMP-signaling in Leydig cells. Since both signaling pathways affect testosterone production and clockwork in the cells, further insights into these signaling pathways will help to unravel disorders linked to the circadian timing system, aging and reproduction.

  12. Dibutyryl cAMP effects on thromboxane and leukotriene production in decompression-induced lung injury

    Science.gov (United States)

    Little, T. M.; Butler, B. D.

    1997-01-01

    Decompression-induced venous bubble formation has been linked to increased neutrophil counts, endothelial cell injury, release of vasoactive eicosanoids, and increased vascular membrane permeability. These actions may account for inflammatory responses and edema formation. Increasing the intracellular cAMP has been shown to decrease eicosanoid production and edema formation in various models of lung injury. Reduction of decompression-induced inflammatory responses was evaluated in decompressed rats pretreated with saline (controls) or dibutyryl cAMP (DBcAMP, an analog of cAMP). After pretreatment, rats were exposed to either 616 kPa for 120 min or 683 kPa for 60 min. The observed increases in extravascular lung water ratios (pulmonary edema), bronchoalveolar lavage, and pleural protein in the saline control group (683 kPa) were not evident with DBcAMP treatment. DBcAMP pretreatment effects were also seen with the white blood cell counts and the percent of neutrophils in the bronchoalveolar lavage. Urinary levels of thromboxane B2, 11-dehydrothromboxane B2, and leukotriene E4 were significantly increased with the 683 kPa saline control decompression exposure. DBcAMP reduced the decompression-induced leukotriene E4 production in the urine. Plasma levels of thromboxane B2, 11-dehydrothromboxane B2, and leukotriene E4 were increased with the 683-kPa exposure groups. DBcAMP treatment did not affect these changes. The 11-dehydrothromboxane B2 and leukotriene E4 levels in the bronchoalveolar lavage were increased with the 683 kPa exposure and were reduced with the DBcAMP treatment. Our results indicate that DBcAMP has the capability to reduce eicosanoid production and limit membrane permeability and subsequent edema formation in rats experiencing decompression sickness.

  13. Inhibition of hormone-sensitive lipase gene expression by cAMP and phorbol esters in 3T3-F442A and BFC-1 adipocytes.

    Science.gov (United States)

    Plée-Gautier, E; Grober, J; Duplus, E; Langin, D; Forest, C

    1996-09-15

    Hormone-sensitive lipase (HSL) catalyses the rate-limiting step in adipocyte lipolysis. Short-term hormonal regulation of HSL activity is well characterized, whereas little is known about the control of HSL gene expression. We have measured HSL mRNA content of 3T3-F442A and BFC-1 adipocytes in response to the cAMP analogue 8-(4-chlorophenylthio)-cAMP (8-CPT-cAMP) and to the phorbol ester phorbol 12-myristate 13-acetate (PMA) by Northern blot, using a specific mouse cDNA fragment. Treatment of the cells for 12 or 6 h with, respectively, 0.5 mM 8-CPT-cAMP or 1 microM PMA produced a maximal decrease of about 60% in HSL mRNA. These effects were unaffected by the protein-synthesis inhibitor anisomycin, suggesting that cAMP and PMA actions were direct. The reduction in HSL mRNA was accompanied by a reduction in HSL total activity. The intracellular routes that cAMP and PMA follow for inducing such an effect seemed clearly independent. (i) After desensitization of the protein kinase C regulation pathway by a 24 h treatment of the cells with 1 microM PMA, PMA action was abolished whereas cAMP was still fully active. (ii) Treatment with saturating concentrations of both agents produced an additive effect. (iii) The synthetic glucocorticoid dexamethasone had no proper effect on HSL gene expression but potentiated cAMP action without affecting PMA action. cAMP inhibitory action on HSL is unexpected. Indeed, the second messenger of catecholamines is the main activator of HSL by phosphorylation. We envision that a long-term cAMP treatment of adipocytes induces a counter-regulatory process that reduces HSL content and, ultimately, limits fatty acid depletion from stored triacylglycerols.

  14. Nuclear toxicology file: cell response to the steady or radioactive chemical elements exposure; Dossier toxicologie nucleaire: reponse cellulaire a l'exposition aux elements chimiques stables ou radioactifs

    Energy Technology Data Exchange (ETDEWEB)

    Lopez, B.S.; Saintigny, Y. [Centre National de la Recherche Scientifique (CNRS), Sciences du Vivant, UMR 217, 92 - Fontenay aux Roses (France); CEA Fontenay aux Roses, IRCM, UMR 217, 92 (France); Adam, Ch. [Institut de Radioprotection et de Surete Nucleaire (IRSN:DEI/SECRE), Lab. de Radioecologie et d' Ecotoxicologie, 13 - Saint-Paul-lez-Durance (France)

    2008-09-15

    The cellular response to an exposure in a toxic element is made at different levels. The first level is the agent detoxication by its elimination or its neutralization. The second level is the repair of the damages caused by this agent (for example the DNA repair). The third level is the control of the cellular death programmed to eliminate the irreparably damaged cells.Finally, the hurt cell can inform the nearby cells by producing molecular effectors inducing an abscopal or bystander effect. (N.C.)

  15. Regulation of phosphoenolpyruvate carboxykinase gene transcription by insulin and cAMP: reciprocal actions on initiation and elongation.

    OpenAIRE

    1988-01-01

    Nuclei isolated from H4IIE rat hepatoma cells were used in an in vitro run-on assay, with probes directed against various regions of the phosphoenolpyruvate carboxykinase [GTP: oxaloacetate carboxy-lyase (transphosphorylating); EC 4.1.1.32] gene, to analyze whether transcription proceeds uniformly across this gene in response to insulin and cAMP treatment. Fewer polymerase II complexes were associated with the phosphoenolpyruvate carboxykinase gene after insulin treatment, as compared with cA...

  16. Methodology to determine skull bone and brain responses from ballistic helmet-to-head contact loading using experiments and finite element analysis.

    Science.gov (United States)

    Pintar, Frank A; Philippens, Mat M G M; Zhang, JiangYue; Yoganandan, Narayan

    2013-11-01

    The objective of the study was to obtain helmet-to-head contact forces from experiments, use a human head finite element model to determine regional responses, and compare outputs to skull fracture and brain injury thresholds. Tests were conducted using two types of helmets (A and B) fitted to a head-form. Seven load cells were used on the head-form back face to measure helmet-to-head contact forces. Projectiles were fired in frontal, left, right, and rear directions. Three tests were conducted with each helmet in each direction. Individual and summated force- and impulse-histories were obtained. Force-histories were inputted to the human head-helmet finite element model. Pulse durations were approximately 4 ms. One-third force and impulse were from the central load cell. 0.2% strain and 40 MPa stress limits were not exceeded for helmet-A. For helmet-B, strains exceeded in left, right, and rear; pressures exceeded in bilateral directions; volume of elements exceeding 0.2% strains correlated with the central load cell forces. For helmet-A, volumes exceeding brain pressure threshold were: 5-93%. All elements crossed the pressure limit for helmet-B. For both helmets, no brain elements exceeded peak principal strain limit. These findings advance our understanding of skull and brain biomechanics from helmet-head contact forces.

  17. The freshman camp report of Computer & Information Engineering(Educationai Development Symposiums)

    OpenAIRE

    粂野, 文洋; Fumihiro, Kumeno

    2016-01-01

    In 2015 and 2016, the freshman camp of Computer & Information Engineering was conducted at Kinugawa Park Hotels, Nikko National Park. We successfully carried out the both camps in almost the same program and schedule. Based on this experience, the basic outline of our camp and the process for preparation and execution has been definite. In this report, we explain the basic outline and what we have done in each phase of the camp: plan, preparation, execution and finalizing. We also analyze the...

  18. Streptococcus pyogenes streptolysin O as a cause of false-positive CAMP reactions.

    OpenAIRE

    Tapsall, J W; Phillips, E A

    1984-01-01

    The synergistic hemolysis of sheep erythrocytes in the CAMP reaction by the sequential action of staphylococcal beta-lysin and the CAMP factor of group B streptococci is the only known function of this extracellular product of group B streptococci. The reaction forms the basis of the CAMP test used to identify group B streptococci because the CAMP factor is believed to be restricted to this group of organisms. However, on occasion other streptococci, notably group A streptococci, may produce ...

  19. Diacylglycerol Kinases Are Widespread in Higher Plants and Display Inducible Gene Expression in Response to Beneficial Elements, Metal, and Metalloid Ions

    Science.gov (United States)

    Escobar-Sepúlveda, Hugo F.; Trejo-Téllez, Libia I.; Pérez-Rodríguez, Paulino; Hidalgo-Contreras, Juan V.; Gómez-Merino, Fernando C.

    2017-01-01

    Diacylglycerol kinases (DGKs) are pivotal signaling enzymes that phosphorylate diacylglycerol (DAG) to yield phosphatidic acid (PA). The biosynthesis of PA from phospholipase D (PLD) and the coupled phospholipase C (PLC)/DGK route is a crucial signaling process in eukaryotic cells. Next to PLD, the PLC/DGK pathway is the second most important generator of PA in response to biotic and abiotic stresses. In eukaryotic cells, DGK, DAG, and PA are implicated in vital processes such as growth, development, and responses to environmental cues. A plethora of DGK isoforms have been identified so far, making this a rather large family of enzymes in plants. Herein we performed a comprehensive phylogenetic analysis of DGK isoforms in model and crop plants in order to gain insight into the evolution of higher plant DGKs. Furthermore, we explored the expression profiling data available in public data bases concerning the regulation of plant DGK genes in response to beneficial elements and other metal and metalloid ions, including silver (Ag), aluminum (Al), arsenic (As), cadmium (Cd), chromium (Cr), mercury (Hg), and sodium (Na). In all plant genomes explored, we were able to find DGK representatives, though in different numbers. The phylogenetic analysis revealed that these enzymes fall into three major clusters, whose distribution depends on the composition of structural domains. The catalytic domain conserves the consensus sequence GXGXXG/A where ATP binds. The expression profiling data demonstrated that DGK genes are rapidly but transiently regulated in response to certain concentrations and time exposures of beneficial elements and other ions in different plant tissues analyzed, suggesting that DGKs may mediate signals triggered by these elements. Though this evidence is conclusive, further signaling cascades that such elements may stimulate during hormesis, involving the phosphoinositide signaling pathway and DGK genes and enzymes, remain to be elucidated.

  20. Identification of a growth hormone-responsive STAT5-binding element in the rat insulin 1 gene

    DEFF Research Database (Denmark)

    Galsgaard, E D; Gouilleux, F; Groner, B

    1996-01-01

    GH and PRL stimulate both proliferation and insulin production in pancreatic beta-cells as well as in the rat insulinoma cell line RIN-5AH, We report here that human GH increases insulin mRNA levels in RIN-5AH cells via both somatogenic and lactogenic receptors. GH stimulated the rat insulin 1...... promoter activity 2-fold, and this stimulation was abolished by introduction of a block mutation in a gamma-interferon-activated sequence (GAS)-like element (GLE) with the sequence 5'-TTCTGGGAA-3' located in the rat insulin 1 enhancer at position -330 to -322. This element, termed Ins-GLE, was able...

  1. A Novel Negative Fe-Deficiency-Responsive Element and a TGGCA-Type-Like FeRE Control the Expression of FTR1 in Chlamydomonas reinhardtii

    Directory of Open Access Journals (Sweden)

    Xiaowen Fei

    2010-01-01

    Full Text Available We have reported three Fe-deficiency-responsive elements (FEREs, FOX1, ATX1, and FEA1, all of which are positive regulatory elements in response to iron deficiency in Chlamydomonas reinhardtii. Here we describe FTR1, another iron regulated gene and mutational analysis of its promoter. Our results reveal that the FeREs of FTR1 distinguish itself from other iron response elements by containing both negative and positive regulatory regions. In FTR1, the −291/−236 region from the transcriptional start site is necessary and sufficient for Fe-deficiency-inducible expression. This region contains two positive FeREs with a TGGCA-like core sequence: the FtrFeRE1 (ATGCAGGCT at −287/−279 and the FtrFeRE2 (AAGCGATTGCCAGAGCGC at −253/−236. Furthermore, we identified a novel FERE, FtrFeRE3 (AGTAACTGTTAAGCC localized at −319/−292, which negatively influences the expression of FTR1.

  2. Cooperative binding of estrogen receptor to imperfect estrogen-responsive DNA elements correlates with their synergistic hormone-dependent enhancer activity.

    Science.gov (United States)

    Martinez, E; Wahli, W

    1989-12-01

    The Xenopus vitellogenin (vit) gene B1 estrogen-inducible enhancer is formed by two closely adjacent 13 bp imperfect palindromic estrogen-responsive elements (EREs), i.e. ERE-2 and ERE-1, having one and two base substitutions respectively, when compared to the perfect palindromic consensus ERE (GGTCANNNTGACC). Gene transfer experiments indicate that these degenerated elements, on their own, have a low or no regulatory capacity at all, but in vivo act together synergistically to confer high receptor- and hormone-dependent transcription activation to the heterologous HSV thymidine kinase promoter. Thus, the DNA region upstream of the vitB1 gene comprising these two imperfect EREs separated by 7 bp, was called the vitB1 estrogen-responsive unit (vitB1 ERU). Using in vitro protein-DNA interaction techniques, we demonstrate that estrogen receptor dimers bind cooperatively to the imperfect EREs of the vitB1 ERU. Binding of a first receptor dimer to the more conserved ERE-2 increases approximately 4- to 8-fold the binding affinity of the receptor to the adjacent less conserved ERE-1. Thus, we suggest that the observed synergistic estrogen-dependent transcription activation conferred by the pair of hormone-responsive DNA elements of the vit B1 ERU is the result of cooperative binding of two estrogen receptor dimers to these two adjacent imperfect EREs.

  3. Hack City Summer: Computer Camps Can Bring a Vacation of Keyboard Delights.

    Science.gov (United States)

    Shell, Ellen Ruppel

    1983-01-01

    Activities at a summer computer camp (Camp Atari held at East Stroudsburg State College PA) are described. The curriculum, using logic, systematic analysis, and other fundamental programing skills, teaches students to interact effectively and creatively with computers. Sources for finding a computer camp are included. (JN)

  4. Culture Camp, Ethnic Identity, and Adoption Socialization for Korean Adoptees: A Pretest and Posttest Study

    Science.gov (United States)

    Baden, Amanda L.

    2015-01-01

    This study explores the impact of racial-ethnic socialization on adopted South Korean children and adolescents who attended a sleepaway Korean culture camp for one week. This camp provided racial-ethnic socialization experiences via exposure to camp counselors, staff, and teachers who were Korean Americans, Korean nationals, and Korean adult…

  5. The accidental city : violence, economy and humanitarianism in Kakuma refugee camp Kenya

    NARCIS (Netherlands)

    Jansen, B.J.

    2011-01-01

    In this research I examine social ordering processes in Kakuma refugee camp in Kenya. I view the camp as an accidental city, by which I challenge the image of the camp as a temporary and artificial waiting space or a protracted refugee crisis per se. The reference to the city is both metaphorical

  6. A Multidisciplinary Science Summer Camp for Students with Emphasis on Environmental and Analytical Chemistry

    Science.gov (United States)

    Schwarz, Gunnar; Frenzel, Wolfgang; Richter, Wolfgang M.; Ta¨uscher, Lothar; Kubsch, Georg

    2016-01-01

    This paper presents the course of events of a five-day summer camp on environmental chemistry with high emphasis on chemical analysis. The annual camp was optional and open for students of all disciplines and levels. The duration of the summer camp was five and a half days in the Feldberg Lake District in northeast Germany (federal state of…

  7. 77 FR 56174 - Proposed Establishment of Class D and Class E Airspace; Camp Guernsey, WY

    Science.gov (United States)

    2012-09-12

    ... 14 CFR Part 71 Proposed Establishment of Class D and Class E Airspace; Camp Guernsey, WY AGENCY... action proposes to establish Class D airspace and Class E airspace at Camp Guernsey Airport, Camp... holidays. An informal docket may also be examined during normal business hours at the Northwest...

  8. Reflections on Refugee Students' Major Perceptions of Education in Kakuma Refugee Camp, Kenya

    Science.gov (United States)

    Mareng, Chuei D.

    2010-01-01

    This reflective study explores refugee students' perceptions of the educational approach used in Kakuma Refugee Camp in Kenya. The study focuses on my personal reflections as a teacher and a student in this camp, and as a refugee. My goal of writing this narrative is to reflect fully on the refugee students' life in a camp and then contribute to…

  9. History Matters: Children's Art Education inside the Japanese American Internment Camp

    Science.gov (United States)

    Wenger, Gina Mumma

    2012-01-01

    What did art education look like within the confines of the Japanese American Internment Camp classrooms? Did the art education in the camps reflect the same curriculum that was being taught outside the camps and what other factors may have played a part in the students' experience? I propose that there were at least three significant…

  10. Antagonists of chemoattractants reveal separate receptors for cAMP, folic acid and pterin in Dictyostelium

    NARCIS (Netherlands)

    Haastert, Peter J.M. van; Wit, René J.W. de; Konijn, Theo M.

    1982-01-01

    Adenosine 3’,5’-monophosphate (cAMP), folic acid and pterin are chemoattractants in the cellular slime molds. The cAMP analog, 3’-amino-cAMP, inhibits a chemotactic reaction to cAMP at a concentration at which the analog is chemotactically inactive. The antagonistic effect of 3’-amino-cAMP on the ch

  11. Activation of FoxO transcription factors contributes to the antiproliferative effect of cAMP

    NARCIS (Netherlands)

    Kuiperij, H.B.; Horst, Armando van der; Raaijmakers, Judith; Weijzen, S.; Medema, R.H.; Bos, J.L.; Burgering, B.M.T.; Zwartkruis, G.J.T.

    2005-01-01

    cAMP is a potent inhibitor of cell proliferation in a variety of cell lines. Downregulation of cyclin D1 and upregulation of the cell cycle inhibitor p27Kip1 are two mechanisms by which cAMP may induce a G1-arrest. Here we show that cAMP inhibits proliferation of cells that constitutively express cy

  12. What Do Children Most Enjoy about Summer Soccer Camp? Gender and Group Perceptions

    Science.gov (United States)

    Jones, Rhys

    2005-01-01

    One hundred children attending a summer soccer camp in NE Ohio provided written data on what they most enjoyed about the camp. Findings indicated that, overall, they ranked "soccer games and skills" and "camp related activities" as the two leading major categories. In terms of gender group analysis (females = 49; males = 51)…

  13. 78 FR 55671 - Hospital Care and Medical Services for Camp Lejeune Veterans

    Science.gov (United States)

    2013-09-11

    ... the residences and workplaces, in addition to other water systems on Camp Lejeune, have tested... substances while at Camp Lejeune. U.S. Marine Corps Base Camp Lejeune includes base housing, training sites..., 2015. We believe that 2 years would provide veterans sufficient time to learn about the new status...

  14. Signatures of rare-earth elements in banded corals of Kalpeni atoll-Lakshadweep archipelago in response to monsoonal variations

    Digital Repository Service at National Institute of Oceanography (India)

    Naqvi, S.A.S.; Nath, B.N.; Balaram, V.

    Concentrations of rare-earth elements (REE) have been determined in seasonal bands of Porites species collected from the Lakshadweep lagoon. Total REE (REE) are very low (less than 3 ppm) in these corals. Seasonal variations in REE appear to have...

  15. Phun Physics 4 Phemales: Physics Camp for High School Girls

    Science.gov (United States)

    Kwon, Chuhee; Gu, Jiyeong; Henriquez, Laura

    2014-03-01

    The department of Physics and Astronomy with the department of Science Education at California State University, Long Beach hosted summer program of ``Phun Physics 4 Phemales (PP4P)'' during summer 2012 and summer 2013 with the support from APS public outreach program. PP4P summer camp was hosted along with a two-week summer science camp, Young Scientists Camp, which has been institutionalized for the last 14 years since 1999. More than 2,500 3rd -8th grade students and 250 teachers have participated in the program. PP4P program provided the tools and support that female high school students need to pursue careers in physics and/or science, technology, engineering and math (STEM) field. This girls-only camp created connections among the girls and built confidence. In addition PP4P program introduced students to key principles in physics by a hands-on lab environment and demonstrated the real-world social impact of physics. In summer 2012, high school girls worked on physics experimental project on electronics and in summer 2013 they worked on the mechanics. I would share our experience in this program and the impact on the female high school students. This work was supported by 2012 Public Outreach and Informing the Public Grants from American Physical Society.

  16. Addressing Nature Deficit Disorder through Primitive Camping Experiences

    Science.gov (United States)

    Allen, Kevin; Varner, Keegan; Sallee, Jeff

    2011-01-01

    Today's youth suffer from Nature Deficit Disorder, a condition that has been connected to ADHD, shortage of creativity, and general lack of knowledge about the outdoors. A team of educators and specialists are addressing this issue with primitive camping. County educators were trained using experiential learning and train-the-trainer techniques.…

  17. Credit-based livelihood interventions in a Zambian refugee camp

    Directory of Open Access Journals (Sweden)

    Jane Travis

    2004-05-01

    Full Text Available Establishing community credit facilities has become an important developmental tool for building livelihood strategies. In the refugee camps where the British NGO Christian Outreach Relief andDevelopment (CORD has worked, programmes have provided credit in the form of cash, agricultural inputs or livestock.

  18. A Pediatric Cardiology Fellowship Boot Camp improves trainee confidence.

    Science.gov (United States)

    Allan, Catherine K; Tannous, Paul; DeWitt, Elizabeth; Farias, Michael; Mansfield, Laura; Ronai, Christina; Schidlow, David; Sanders, Stephen P; Lock, James E; Newburger, Jane W; Brown, David W

    2016-12-01

    Introduction New paediatric cardiology trainees are required to rapidly assimilate knowledge and gain clinical skills to which they have limited or no exposure during residency. The Pediatric Cardiology Fellowship Boot Camp (PCBC) at Boston Children's Hospital was designed to provide incoming fellows with an intensive exposure to congenital cardiac pathology and a broad overview of major areas of paediatric cardiology practice.

  19. The Career Camp: An Early, Early Career Guidance Program.

    Science.gov (United States)

    Wright, Sue Edmonds

    1995-01-01

    Describes Marshall University's summer camp where young people participate in activities that help prepare them for important career choices they will need to make when entering college. Benefits for the university include: recruitment, enhanced community partnerships, better informed incoming freshman, and publicity for the career center. (JBJ)

  20. Camping Burner-Based Flame Emission Spectrometer for Classroom Demonstrations

    Science.gov (United States)

    Ne´el, Bastien; Crespo, Gasto´n A.; Perret, Didier; Cherubini, Thomas; Bakker, Eric

    2014-01-01

    A flame emission spectrometer was built in-house for the purpose of introducing this analytical technique to students at the high school level. The aqueous sample is sprayed through a homemade nebulizer into the air inlet of a consumer-grade propane camping burner. The resulting flame is analyzed by a commercial array spectrometer for the visible…

  1. Novel H1N1 Flu and Camp

    Centers for Disease Control (CDC) Podcasts

    2009-06-30

    This podcast gives tips to stay healthy and help prevent infection with novel H1N1 flu if your child or someone you know is going to camp.  Created: 6/30/2009 by Centers for Disease Control and Prevention (CDC).   Date Released: 6/30/2009.

  2. Archaeology and Memory. Former WWII Camps in Europe

    NARCIS (Netherlands)

    Laarse, van der R.; Ooijen, van I.M.A.

    The archaeology of 20th-century war, terror and conflict is a growing field of research. The archaeological research of ‘terrorscapes’ often overlaps with personal and collective memories. Besides memory, the heritage of the camps has been dominated in the last decades by historical research. What t

  3. Menselijk gedrag bij de evacuatie van een camping

    NARCIS (Netherlands)

    Kerstholt, J.H.; Groenewegen-Ter Morsche, K.; Johannink, R.; Getz-Smeenk, A.F.

    2010-01-01

    In geval van onbeheersbare natuurbranden zal er een beroep moeten worden gedaan op de zelfredzaamheid van burgers. De resultaten van een ontruiming van een camping laten zien dat vele deelnemers niet reageerden op rook en brandgeur en dat ze slechts in actie kwamen nadat z|j door een personeelslid v

  4. Chinese Students’ Winter Camp Tour of the U. S.

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    <正>At the invitation of Brigham Young University (BYU)-Hawaii of the U. S., a 26-member middle school student winter camp delegation, organized and sent by the CPAFFC, made a study tour of the U. S. with the theme of enhancing friendship between the

  5. Graying America Presents Golden Opportunities for Camp Directors.

    Science.gov (United States)

    Cosky, Alicia C.

    1989-01-01

    Discusses quality-of-life issues for ever-increasing population of American elderly, emphasizing value of recreation. Offers organized camping as way of exposing older adults to enjoyable physical activities. Cites evidence supporting beneficial effects of regular exercise for elderly, beginning at any age. (TES)

  6. Camp stability predicts patterns of hunter-gatherer cooperation.

    Science.gov (United States)

    Smith, Daniel; Dyble, Mark; Thompson, James; Major, Katie; Page, Abigail E; Chaudhary, Nikhil; Salali, Gul Deniz; Vinicius, Lucio; Migliano, Andrea Bamberg; Mace, Ruth

    2016-07-01

    Humans regularly cooperate with non-kin, which has been theorized to require reciprocity between repeatedly interacting and trusting individuals. However, the role of repeated interactions has not previously been demonstrated in explaining real-world patterns of hunter-gatherer cooperation. Here we explore cooperation among the Agta, a population of Filipino hunter-gatherers, using data from both actual resource transfers and two experimental games across multiple camps. Patterns of cooperation vary greatly between camps and depend on socio-ecological context. Stable camps (with fewer changes in membership over time) were associated with greater reciprocal sharing, indicating that an increased likelihood of future interactions facilitates reciprocity. This is the first study reporting an association between reciprocal cooperation and hunter-gatherer band stability. Under conditions of low camp stability individuals still acquire resources from others, but do so via demand sharing (taking from others), rather than based on reciprocal considerations. Hunter-gatherer cooperation may either be characterized as reciprocity or demand sharing depending on socio-ecological conditions.

  7. The RGS protein Crg2 regulates both pheromone and cAMP signalling in Cryptococcus neoformans.

    Science.gov (United States)

    Xue, Chaoyang; Hsueh, Yen-Ping; Chen, Lydia; Heitman, Joseph

    2008-10-01

    G proteins orchestrate critical cellular functions by transducing extracellular signals into internal signals and controlling cellular responses to environmental cues. G proteins typically function as switches that are activated by G protein-coupled receptors (GPCRs) and negatively controlled by regulator of G protein signalling (RGS) proteins. In the human fungal pathogen Cryptococcus neoformans, three G protein alpha subunits (Gpa1, Gpa2 and Gpa3) have been identified. In a previous study, we identified the RGS protein Crg2 involved in regulating the pheromone response pathway through Gpa2 and Gpa3. In this study, a role for Crg2 was established in the Gpa1-cAMP signalling pathway that governs mating and virulence. We show that Crg2 physically interacts with Gpa1 and crg2 mutations increase cAMP production. crg2 mutations also enhance mating filament hyphae production, but reduce cell-cell fusion and sporulation efficiency during mating. Although crg2 mutations and the Gpa1 dominant active allele GPA1(Q284L) enhanced melanin production under normally repressive conditions, virulence was attenuated in a murine model. We conclude that Crg2 participates in controlling both Gpa1-cAMP-virulence and pheromone-mating signalling cascades and hypothesize it may serve as a molecular interface between these two central signalling conduits.

  8. Cross-talk between signaling pathways can generate robust oscillations in calcium and cAMP.

    Directory of Open Access Journals (Sweden)

    Fernando Siso-Nadal

    Full Text Available BACKGROUND: To control and manipulate cellular signaling, we need to understand cellular strategies for information transfer, integration, and decision-making. A key feature of signal transduction is the generation of only a few intracellular messengers by many extracellular stimuli. METHODOLOGY/PRINCIPAL FINDINGS: Here we model molecular cross-talk between two classic second messengers, cyclic AMP (cAMP and calcium, and show that the dynamical complexity of the response of both messengers increases substantially through their interaction. In our model of a non-excitable cell, both cAMP and calcium concentrations can oscillate. If mutually inhibitory, cross-talk between the two second messengers can increase the range of agonist concentrations for which oscillations occur. If mutually activating, cross-talk decreases the oscillation range, but can generate 'bursting' oscillations of calcium and may enable better filtering of noise. CONCLUSION: We postulate that this increased dynamical complexity allows the cell to encode more information, particularly if both second messengers encode signals. In their native environments, it is unlikely that cells are exposed to one stimulus at a time, and cross-talk may help generate sufficiently complex responses to allow the cell to discriminate between different combinations and concentrations of extracellular agonists.

  9. PPARgamma-dependent regulation of adenylate cyclase 6 amplifies the stimulatory effect of cAMP on renin gene expression.

    Science.gov (United States)

    Desch, Michael; Schubert, Thomas; Schreiber, Andrea; Mayer, Sandra; Friedrich, Björn; Artunc, Ferruh; Todorov, Vladimir T

    2010-11-01

    The second messenger cAMP plays an important role in the regulation of renin gene expression. Nuclear receptor peroxisome proliferator-activated receptor-γ (PPARγ) is known to stimulate renin gene transcription acting through PPARγ-binding sequences in renin promoter. We show now that activation of PPARγ by unsaturated fatty acids or thiazolidinediones drastically augments the cAMP-dependent increase of renin mRNA in the human renin-producing cell line Calu-6. The underlying mechanism involves potentiation of agonist-induced cAMP increase and up-regulation of adenylate cyclase 6 (AC6) gene expression. We identified a palindromic element with a 3-bp spacer (Pal3) in AC6 intron 1 (AC6Pal3). AC6Pal3 bound PPARγ and mediated trans-activation by PPARγ agonist. AC6 knockdown decreased basal renin mRNA level and attenuated the maximal PPARγ-dependent stimulation of the cAMP-induced renin gene expression. AC6Pal3 decoy oligonucleotide abrogated the PPARγ-dependent potentiation of cAMP-induced renin gene expression. Treatment of mice with PPARγ agonist increased AC6 mRNA kidney levels. Our data suggest that in addition to its direct effect on renin gene transcription, PPARγ "sensitizes" renin gene to cAMP via trans-activation of AC6 gene. AC6 has been identified as PPARγ target gene with a functional Pal3 sequence.

  10. GCC box in Arabidopsis PDF1.2 promoter is an essential and sufficient cis-acting element in response to MeJA treatment

    Institute of Scientific and Technical Information of China (English)

    ZHANG Haiwen; XIE Bingyan; LU Xiangyang; YANG Yuhong; HUANG Rongfeng

    2004-01-01

    The expression of Arabidopsis PDF1.2 gene is regulated by jasmonic acid (JA) and ethylene (ET). It also has been well documented that GCC box is an element responsive to ET,however, the responsive mechanism of JA in such plant defense gene expression is unclear. In this paper, the authors define the essential cis-acting element in PDF1.2 promoter responsive to methyl jasmonate (MeJA) through fragment deletions and site-directed mutageneses combining Agrobacterium-mediated transient reporter gene expression in tobacco leaves. Firstly, the MeJA inducible expression of PDF1.2 was confirmed by using the upstream -1.86 kb fragment of PDF1.2 gene. Secondly, the upstream -300--243 bp fragment of the promoter was evidenced to respond to MeJA. To further characterize this promoter region, three point mutations were introduced into the -300--243 bp fragment of the promoter. This result showed that the mutation of GCC box abolished MeJA induction, whereas the mutations of the G box-like and the imperfect palindrome sequence did not significantly decrease MeJA inducible effect, indicating that GCC box in PDF1.2 is essential for MeJA induction. The sufficient responsiveness to MeJA of this GCC box was further investigated by 4×GCC fused upstream to the CaMV 35S minimal promoter. This result suggested that the fused promoter was able to activate reporter gene expression in response to MeJA. Thus these results indicate that the GCC box in PDF1.2 is an essential and sufficient element to confer MeJA induction.

  11. Exogenous and endogenous ghrelin counteracts GLP-1 action to stimulate cAMP signaling and insulin secretion in islet β-cells.

    Science.gov (United States)

    Damdindorj, Boldbaatar; Dezaki, Katsuya; Kurashina, Tomoyuki; Sone, Hideyuki; Rita, Rauza; Kakei, Masafumi; Yada, Toshihiko

    2012-07-30

    We studied interactive effects of insulinotropic GLP-1 and insulinostatic ghrelin on rat pancreatic islets. GLP-1 potentiated glucose-induced insulin release and cAMP production in isolated islets and [Ca(2+)](i) increases in single β-cells, and these potentiations were attenuated by ghrelin. Ghrelin suppressed [Ca(2+)](i) responses to an adenylate cyclase activator forskolin. Moreover, GLP-1-induced insulin release and cAMP production were markedly enhanced by [D-lys(3)]-GHRP-6, a ghrelin receptor antagonist, in isolated islets. These results indicate that both exogenous and endogenous islet-derived ghrelin counteracts glucose-dependent GLP-1 action to increase cAMP production, [Ca(2+)](i) and insulin release in islet β-cells, positioning ghrelin as a modulator of insulinotropic GLP-1.

  12. The MprF protein is required for lysinylation of phospholipids in listerial membranes and confers resistance to cationic antimicrobial peptides (CAMPs) on Listeria monocytogenes

    NARCIS (Netherlands)

    Thedieck, Kathrin; Hain, Torsten; Mohamed, Walid; Tindall, Brian J; Nimtz, Manfred; Chakraborty, Trinad; Wehland, Jürgen; Jänsch, Lothar

    2006-01-01

    Pathogenic bacteria have to cope with defence mechanisms mediated by adaptive and innate immunity of the host cells. Cationic antimicrobial peptides (CAMPs) represent one of the most effective components of the host innate immune response. Here we establish the function of Lmo1695, a member of the V

  13. Preliminary assessment report for Camp Carroll Training Center, Installation 02045, Anchorage, Alaska. Installation Restoration Program

    Energy Technology Data Exchange (ETDEWEB)

    Krokosz, M.; Sefano, J.

    1993-08-01

    This report presents the results of the preliminary assessment (PA) conducted by Argonne National Laboratory at the Alaska Army National Guard property known as Camp Carroll Training Center, located on the Fort Richardson Army facility near Anchorage, Alaska. Preliminary assessments of federal facilities are being conducted to compile the information necessary for the completion of preremedial activities and to provide a basis for establishing, corrective actions in response to releases of hazardous substances. The principal objective of the PA is to characterize the site accurately and determine the need for further action by examining site activities, types and quantities of hazardous substances used, the nature and amounts of wastes generated or stored at the facility, and potential pathways by which contamination could affect public health and the environment. The primary environmentally significant operations (ESOs) associated with the property are (1) the Alaska Air National Guard storage area behind Building S57112 (Organizational Maintenance Shop [OMS] 6); (2) the state of Alaska maintenance facility and the soil/tar-type spill north of the state of Alaska maintenance facility; (3) the waste storage area adjacent to OMS 6; (4) the contaminated area from leaking underground storage tanks (USTs) and the oil-water separator; and (5) soil staining in the parking area at the Camp Carroll Headquarters Building. Camp Carroll appears to be in excellent condition from an environmental standpoint, and current practices are satisfactory. Argonne recommends that the Alaska Department of Military Affairs consider remediation of soil contamination associated with all storage areas, as well as reviewing the practices of other residents of the facility. Argonne also recommends that the current methods of storing waste material behind Building S57112 (OMS 6) be reviewed for alternatives.

  14. Using Science Camps to Develop Understandings about Scientific Inquiry--Taiwanese Students in a U.S. Summer Science Camp

    Science.gov (United States)

    Antink-Meyer, Allison; Bartos, Stephen; Lederman, Judith S.; Lederman, Norman G.

    2016-01-01

    Recent years have witnessed a dramatic rise in the number of middle and high school students from Asian countries participating in U.S.-based summer experiences (Perlez & Gao, 2013). Although summer science camps have been shown to improve students' attitudes and interests related to science and science learning (Bhattacharyya, Mead &…

  15. Extended spectrum β-lactamases, carbapenemases and mobile genetic elements responsible for antibiotics resistance in Gram-negative bacteria.

    Science.gov (United States)

    El Salabi, Allaaeddin; Walsh, Timothey R; Chouchani, Chedly

    2013-05-01

    Infectious diseases due to Gram-negative bacteria are a leading cause of morbidity and mortality worldwide. Antimicrobial agents represent one major therapeutic tools implicated to treat these infections. The misuse of antimicrobial agents has resulted in the emergence of resistant strains of Gram-negatives in particular Enterobacteriaceae and non-fermenters; they have an effect not only on a human but on the public health when bacteria use the resistance mechanisms to spread in the hospital environment and to the community outside the hospitals by means of mobile genetic elements. Gram-negative bacteria have become increasingly resistant to antimicrobial agents. They have developed several mechanisms by which they can withstand to antimicrobials, these mechanisms include the production of Extended-spectrum β-lactamases (ESBLs) and carbapenemases, furthermore, Gram-negative bacteria are now capable of spreading such resistance between members of the family Enterobacteriaceae and non-fermenters using mobile genetic elements as vehicles for such resistance mechanisms rendering antibiotics useless. Therefore, addressing the issue of mechanisms of antimicrobial resistance is considered one of most urgent priorities. This review will help to illustrate different resistance mechanisms; ESBLs, carbapenemases encoded by genes carried by mobile genetic elements, which are used by Gram-negative bacteria to escape antimicrobial effect.

  16. Novel cAMP signalling paradigms: therapeutic implications for airway disease

    OpenAIRE

    Billington, Charlotte K; Hall, Ian P

    2012-01-01

    Since its discovery over 50 years ago, cAMP has been the archetypal second messenger introducing students to the concept of cell signalling at the simplest level. As explored in this review, however, there are many more facets to cAMP signalling than the path from Gs-coupled receptor to adenylyl cyclase (AC) to cAMP to PKA to biological effect. After a brief description of this canonical cAMP signalling pathway, a snapshot is provided of the novel paradigms of cAMP signalling. As in the airwa...

  17. Inactivation of Multidrug Resistance Proteins Disrupts Both Cellular Extrusion and Intracellular Degradation of cAMP

    OpenAIRE

    Xie, Moses; Rich, Thomas C.; Scheitrum, Colleen; Conti, Marco; Richter, Wito

    2011-01-01

    In addition to xenobiotics and several other endogenous metabolites, multidrug-resistance proteins (MRPs) extrude the second-messenger cAMP from various cells. Pharmacological and/or genetic inactivation of MRPs has been shown to augment intracellular cAMP signaling, an effect assumed to be a direct consequence of the blockade of cAMP extrusion. Here we provide evidence that the augmented intracellular cAMP levels are not due exclusively to the prevention of cAMP efflux because MRP inactivati...

  18. Transcutaneous electrical nerve stimulation (TENS) improves the diabetic cytopathy (DCP) via up-regulation of CGRP and cAMP.

    Science.gov (United States)

    Ding, Liucheng; Song, Tao; Yi, Chaoran; Huang, Yi; Yu, Wen; Ling, Lin; Dai, Yutian; Wei, Zhongqing

    2013-01-01

    The objective of this study was to investigate the effects and mechanism of Transcutaneous Electrical Nerve Stimulation (TENS) on the diabetic cytopathy (DCP) in the diabetic bladder. A total of 45 rats were randomly divided into diabetes mellitus (DM)/TENS group (n=15), DM group (n=15) and control group (n=15). The rats in the DM/TENS and TENS groups were electronically stimulated (stimulating parameters: intensity-31 V, frequency-31 Hz, and duration of stimulation of 15 min) for three weeks. Bladder histology, urodynamics and contractile responses to field stimulation and carbachol were determined. The expression of calcitonin gene-related peptide (CGRP) was analyzed by RT-PCR and Western blotting. The results showed that contractile responses of the DM rats were ameliorated after 3 weeks of TENS. Furthermore, TENS significantly increased bladder wet weight, volume threshold for micturition and reduced PVR, V% and cAMP content of the bladder. The mRNA and protein levels of CGRP in dorsal root ganglion (DRG) in the DM/TENS group were higher than those in the DM group. TENS also significantly up-regulated the cAMP content in the bladder body and base compared with diabetic rats. We conclude that TENS can significantly improve the urine contractility and ameliorate the feeling of bladder fullness in DM rats possibly via up-regulation of cAMP and CGRP in DRG.

  19. Transcutaneous electrical nerve stimulation (TENS improves the diabetic cytopathy (DCP via up-regulation of CGRP and cAMP.

    Directory of Open Access Journals (Sweden)

    Liucheng Ding

    Full Text Available The objective of this study was to investigate the effects and mechanism of Transcutaneous Electrical Nerve Stimulation (TENS on the diabetic cytopathy (DCP in the diabetic bladder. A total of 45 rats were randomly divided into diabetes mellitus (DM/TENS group (n=15, DM group (n=15 and control group (n=15. The rats in the DM/TENS and TENS groups were electronically stimulated (stimulating parameters: intensity-31 V, frequency-31 Hz, and duration of stimulation of 15 min for three weeks. Bladder histology, urodynamics and contractile responses to field stimulation and carbachol were determined. The expression of calcitonin gene-related peptide (CGRP was analyzed by RT-PCR and Western blotting. The results showed that contractile responses of the DM rats were ameliorated after 3 weeks of TENS. Furthermore, TENS significantly increased bladder wet weight, volume threshold for micturition and reduced PVR, V% and cAMP content of the bladder. The mRNA and protein levels of CGRP in dorsal root ganglion (DRG in the DM/TENS group were higher than those in the DM group. TENS also significantly up-regulated the cAMP content in the bladder body and base compared with diabetic rats. We conclude that TENS can significantly improve the urine contractility and ameliorate the feeling of bladder fullness in DM rats possibly via up-regulation of cAMP and CGRP in DRG.

  20. A Full Dynamic Compound Inverse Method for output-only element-level system identification and input estimation from earthquake response signals

    Science.gov (United States)

    Pioldi, Fabio; Rizzi, Egidio

    2016-08-01

    This paper proposes a new output-only element-level system identification and input estimation technique, towards the simultaneous identification of modal parameters, input excitation time history and structural features at the element-level by adopting earthquake-induced structural response signals. The method, named Full Dynamic Compound Inverse Method (FDCIM), releases strong assumptions of earlier element-level techniques, by working with a two-stage iterative algorithm. Jointly, a Statistical Average technique, a modification process and a parameter projection strategy are adopted at each stage to achieve stronger convergence for the identified estimates. The proposed method works in a deterministic way and is completely developed in State-Space form. Further, it does not require continuous- to discrete-time transformations and does not depend on initialization conditions. Synthetic earthquake-induced response signals from different shear-type buildings are generated to validate the implemented procedure, also with noise-corrupted cases. The achieved results provide a necessary condition to demonstrate the effectiveness of the proposed identification method.