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Sample records for arcus senilis

  1. Significance of corneal arcus

    Directory of Open Access Journals (Sweden)

    K Mohan Raj

    2015-01-01

    Full Text Available The corneal arcus consists of cholesterol, phospholipids and triglycerides. As serum triglyceride is one of the accurate of lipid metabolic state, greater importance was given, and it was found to be elevated in 72% of patients and a positive correlation with increasing age. This suggests a strong correlation between impairment of lipid metabolism and incidence of corneal arcus.

  2. Correlating corneal arcus with atherosclerosis in familial hypercholesterolemia

    Directory of Open Access Journals (Sweden)

    Zech Loren A

    2008-03-01

    Full Text Available Abstract Background A relationship between corneal arcus and atherosclerosis has long been suspected but is controversial. The homozygous familial hypercholesterolemia patients in this study present a unique opportunity to assess this issue. They have both advanced atherosclerosis and corneal arcus. Methods This is a cross-sectional study of 17 patients homozygous for familial hypercholesterolemia presenting to the Clinical Center of the National Institutes of Health. Plasma lipoproteins, circumferential extent of arcus, thoracic aorta and coronary calcific atherosclerosis score, and Achilles tendon width were measured at the National Institutes of Health. Results Patients with corneal arcus had higher scores for calcific atherosclerosis (mean 2865 compared to 412, cholesterol-year score (mean 11830 mg-yr/dl compared to 5707 mg-yr/dl, and Achilles tendon width (mean 2.54 cm compared to 1.41 cm than those without. Corneal arcus and Achilles tendon width were strongly correlated and predictive of each other. Although corneal arcus was correlated with calcific atherosclerosis (r = 0.67; p = 0.004, it was not as highly correlated as was the Achilles tendon width (r = 0.855; p Conclusion Corneal arcus reflects widespread tissue lipid deposition and is correlated with both calcific atherosclerosis and xanthomatosis in these patients. Patients with more severe arcus tend to have more severe calcific atherosclerosis. Corneal arcus is not as good an indicator of calcific atherosclerosis as Achilles tendon thickness, but its presence suggests increased atherosclerosis in these hypercholesterolemic patients.

  3. Association between corneal arcus and some of the risk factors for coronary artery disease.

    OpenAIRE

    Pe'er, J; Vidaurri, J.; Halfon, S. T.; Eisenberg, S; Zauberman, H

    1983-01-01

    The relationships between coronary artery disease risk factors and corneal arcus were examined in 150 adults aged 55 years and above of both sexes and from different ethnic origins. The width of the corneal arcus was measured accurately by a digitiser, and the risk factors for coronary artery disease were examined according to the standard procedure used by the Lipid Research Clinics. The results show that the corneal arcus is more frequent in males; the frequency and size of corneal arcus ar...

  4. System for quantifying the formation stages of corneal arcus

    Science.gov (United States)

    Nasution, Aulia; Fahdarina, Sally; Cahya, Deny I.

    2015-07-01

    Extensive research on interpreting the clinical signs of corneal-arcus formation and their related diagnostics potentials have found that there is a strong correlation of the arcus formation with the risk of coronary artery diseases and lipid stratification. Clinically the stages of the arcus formation are normally observed as separate grey-whitish arcs, that are formed at the inferior and then at the superior poles of the cornea. These arcs will by time being elongated to form a ring approximately 1 mm in width. In this paper, efforts to develop quantification system that is capable to recognize the stages of the arcus formation will be reported. The quantification was based on eye-images taken using prior developed low-cost digital image acquisition system, which self constructed from a plastic safety welding-goggle that was modified by placing two Logitec C525 webcam and LEDs lighting system. Pattern images of arcs with variation of arc's positions, lengths and thickness were used for pre-calibration purposes. Then these similar arcs are drawn on the of periphery of cornea images to simulate dummy corneal arcus, which mimick the stages of corneal arcus development. Using 672 data images, results of recognition show a good recognition rate, i.e. 93.6 % for determining arc's length (with maximum %RSD of 5.67 %) and 84.83 % for determining arc's thickness (with maximum %RSD of 5.67 %). Worser precision data were observed to happen for the small arc's length as well as small arc's thickness. Current efforts are devoted to translate the system for clinical trials.

  5. Arcus: An X-ray Grating Spectroscopy Mission

    Science.gov (United States)

    Smith, Randall K.; Arcus Collaboration

    2016-01-01

    We present the design and scientific motivation for Arcus, an X-ray grating spectrometer mission to be proposed to NASA as a MIDEX in 2016. This mission will observe structure formation at and beyond the edges of clusters and galaxies, feedback from supermassive black holes, the structure of the interstellar medium and the formation and evolution of stars. Key mission design parameters are R~3000 and >700 cm^2 of effective area at the crucial O VII and O VIII lines, with the full bandpass going from ~10-50Å. Arcus will use the silicon pore optics proposed for ESA's Athena mission, paired with off-plane gratings being developed at the University of Iowa and combined with MIT/Lincoln Labs CCDs.

  6. Xanthelasmata, arcus corneae, and ischaemic vascular disease and death in general population: prospective cohort study

    DEFF Research Database (Denmark)

    Christoffersen, Mette; Frikke-Schmidt, Ruth; Schnohr, Peter; Jensen, Gorm B; Nordestgaard, Børge G; Tybjærg-Hansen, Anne

    2011-01-01

    To test the hypothesis that xanthelasmata and arcus corneae, individually and combined, predict risk of ischaemic vascular disease and death in the general population.......To test the hypothesis that xanthelasmata and arcus corneae, individually and combined, predict risk of ischaemic vascular disease and death in the general population....

  7. Morfología y anatomía del cefalio de Cephalocereus senilis (Cactaceae

    Directory of Open Access Journals (Sweden)

    Vázquez-Sánchez, Monserrat

    2005-12-01

    Full Text Available We study the morphology and anatomy of Cephalocereus senilis (Haw. Pfeiff. flowering zone to describe and compare it with the information available for other species. We described in detail the vegetative and reproductive branches. Results show that there are morphological changes linked to anatomical ones after the flowering zone is differentiated. The flowering zone in this species is termed lateral cephalium by its interareolar space reduction, areole size increment, and high production of long bristles and trichomes in the areoles. Moreover, periderm development near the apical meristem, lack of chlorenchyma and a delay in xylematic fibers differentiation are traits related with the lateral cephalium. The lateral cephalium of C. senilis shows modifications previously reported for the Espostoa species with lateral cephalium, except for the presence of crystals in the trichomes, the addition of new ribs to the cephalium, and the growth in xylem and phloem parenchyma.Se estudió la morfología y anatomía de la zona florífera de Cephalocereus seniles (Haw. Pfeiff. con la finalidad de caracterizarla y compararla con la información disponible para otras especies. Se describen con detalle las ramas vegetativas y reproductivas. Los resultados mostraron que existen cambios en la morfología relacionados con cambios en la anatomía después de la formación de la zona florífera. La reducción de los espacios interareolares, el incremento en el tamaño de las aréolas y una densa producción de cerdas y tricomas largos en las aréolas de la zona florífera permiten reconocerla como un cefalio lateral. Tres cambios anatómicos se asocian a la presencia del cefalio lateral: el desarrollo de la peridermis cercana al meristemo apical, la ausencia de clorénquima y el retardo en la formación de fibras en el xilema secundario. El cefalio lateral de C. seniles presenta las modificaciones reportadas para las especies del género Espostoa, también con

  8. The Arctic Research Consortium of the United States (ARCUS): Connecting Arctic Research

    Science.gov (United States)

    Rich, R. H.; Wiggins, H. V.; Creek, K. R.; Sheffield Guy, L.

    2015-12-01

    This presentation will highlight the recent activities of the Arctic Research Consortium of the United States (ARCUS) to connect Arctic research. ARCUS is a nonprofit membership organization of universities and institutions that have a substantial commitment to research in the Arctic. ARCUS was formed in 1988 to serve as a forum for planning, facilitating, coordinating, and implementing interdisciplinary studies of the Arctic; to act as a synthesizer and disseminator of scientific information on arctic research; and to educate scientists and the general public about the needs and opportunities for research in the Arctic. ARCUS, in collaboration with the broader science community, relevant agencies and organizations, and other stakeholders, coordinates science planning and educational activities across disciplinary and organizational boundaries. Examples of ARCUS projects include: Arctic Sea Ice Outlook - an international effort that provides monthly summer reports synthesizing community estimates of the expected sea ice minimum. Sea Ice for Walrus Outlook - a resource for Alaska Native subsistence hunters, coastal communities, and others that provides weekly reports with information on sea ice conditions relevant to walrus in Alaska waters. PolarTREC (Teachers and Researchers Exploring and Collaborating) - a program whereby K-12 educators and researchers work together in hands-on field experiences in the Arctic and Antarctic to advance polar science education. ArcticInfo mailing list, Witness the Arctic newsletter, and the Arctic Calendar - communication tools for the arctic science community to keep apprised of relevant news, meetings, and announcements. Coordination for the Study of Environmental Arctic Change (SEARCH) program, which aims to provide scientific understanding of arctic environmental change to help society understand and respond to a rapidly changing Arctic. More information about these and other ARCUS activities can be found at the ARCUS website at

  9. Risk Factors for Senile Corneal Arcus in Patients with Acute Myocardial Infarction

    OpenAIRE

    Mirnaghi Moosavi; Ahmad Sareshtedar; Siamak Zarei-Ghanavati; Mehran Zarei-Ghanavati; Nazanin Ramezanfar

    2010-01-01

    Purpose: To investigate the association between senile corneal arcus and atherosclerosis risk factors in patients with recent acute myocardial infarction. Methods: In this cross sectional study, atherosclerosis risk factors including fasting blood sugar, total cholesterol and triglyceride levels were measured in 165 patients with recent (less than three months′ duration) acute myocardial infarction. Slitlamp examination was performed to detect corneal arcus. Associations between senile co...

  10. Risk Factors for Senile Corneal Arcus in Patients with Acute Myocardial Infarction

    OpenAIRE

    Moosavi, Mirnaghi; Sareshtedar, Ahmad; Zarei-Ghanavati, Siamak; Zarei-Ghanavati, Mehran; Ramezanfar, Nazanin

    2010-01-01

    Purpose To investigate the association between senile corneal arcus and atherosclerosis risk factors in patients with recent acute myocardial infarction. Methods In this cross sectional study, atherosclerosis risk factors including fasting blood sugar, total cholesterol and triglyceride levels were measured in 165 patients with recent (less than three months’ duration) acute myocardial infarction. Slitlamp examination was performed to detect corneal arcus. Associations between senile corneal ...

  11. Arcus: Exploring the Formation and Evolution of Clusters, Galaxies, and Stars

    Science.gov (United States)

    Smith, Randall K.

    2016-04-01

    We present the scientific motivation and performance for Arcus, an X-ray grating spectrometer mission to be proposed to NASA as a MIDEX in 2016. This mission will observe structure formation at and beyond the edges of clusters and galaxies, feedback from supermassive black holes, the structure of the interstellar medium and the formation and evolution of stars. Key mission design parameters are R = 3000 with >500 cm2 of effective area at the crucial O VII and O VIII lines, with the full bandpass going from ~10-50 Angstroms. Arcus will use the silicon pore optics developed for ESA’s Athena mission, paired with off-plane gratings being developed at the University of Iowa and combined with MIT/Lincoln Labs CCDs. With essentially no consumables, Arcus should achieve its mission goals in under 2 years, after which we anticipate a substantial period of operation as a general observatory.

  12. Corneal arcus and xanthomas in homozygous familial hypercholesterolemia: First report from China

    Directory of Open Access Journals (Sweden)

    Xin Meng

    2013-01-01

    Full Text Available We report the case of a 12-year-old male who developed corneal arcus and multiple skin lesions with a 10-year history of xanthomas. The lesions appeared over his fingers, hands, elbows, knees, buttocks and feet. Laboratory studies showed a total serum cholesterol level of 752.1 mg/dL; a triglyceride level of 96.6 mg/dL; a low-density lipoprotein cholesterol level of 661.3 mg/dL. Findings were consistent with homozygous familial hypercholesterolemia. To our knowledge, this is the first such case to be reported from China.

  13. Right sided arcus aorta as a cause of dyspnea and chronic cough

    Directory of Open Access Journals (Sweden)

    Ozkaya Sevket

    2012-10-01

    Full Text Available Abstract Background Right sided arcus aorta (RSAA is a rare condition that is usually asymptomatic. Patients may present with exertional dyspnea and chronic cough. A recent article suggested that RSAA should be included in the differential diagnosis of asthma, especially in patients with intractable exertional dyspnea. We aimed to present the clinical, radiologic and spirometric features of thirteen patients with RSAA observed in four years at the Rize Education and Research Hospital and Samsun Chest Diseases and Thoracic Surgery Hospital. Methods The characteristics of patients with RSAA, including age, gender, symptoms, radiologic and spirometric findings, were retrospectively evaluated. Results A total of thirteen patients were diagnosed with RSAA. Their ages ranged from 17 to 86 years and the male to female ratio was 11:2. Seven of the patients (54% were symptomatic. The most common symptoms were exertional dyspnea, dysphagia and chronic cough. Five patients had received treatment for asthma with bronchodilators. Spirometry showed intrathoracic tracheal obstruction in five patients. Conclusions The RSAA anomaly occurs more frequently than might be estimated from the number of patients who are detected. Patients with intractable exertional dyspnea and chronic cough should be evaluated for the RSAA anomaly by thoracic CT.

  14. Characterization of High Density Lipoprotein Particles in Familial Apolipoprotein A-I Deficiency With Premature Coronary Atherosclerosis, Corneal Arcus and Opacification, and Tubo-Eruptive and Planar Xanthomas

    Science.gov (United States)

    We describe two male siblings with homozygous familial apolipoprotein (apo) A-I deficiency, markedly decreased high density lipoprotein (HDL) cholesterol levels, undetectable plasma apoA-1, tubo-eruptive and planar xanthomas, and mild corneal arcus and opacification. Sequencing of the apoA-I gene re...

  15. Teachers, Researchers, and Students Collaborating in Arctic Climate Change Research: The Partnership Between the Svalbard REU and ARCUS PolarTREC programs

    Science.gov (United States)

    Roof, S.; Warburton, J.; Oddo, B.; Kane, M.

    2007-12-01

    Since 2004, the Arctic Research Consortium of the U.S. (ARCUS) "TREC" program (Teachers and Researchers Exploring and Collaborating, now "PolarTREC") has sent four K-12 teachers to Svalbard, Norway to work alongside researchers and undergraduate students conducting climate change research as part of the Svalbard Research Experiences for Undergraduates (REU) Program. The benefits of this scientist/educator/student partnership are many. Researchers benefit from teacher participation as it increases their understanding of student learning and the roles and responsibilities of K-12 teachers. The TREC teacher contributes to the research by making observations, analyzing data, and carrying heavy loads of equipment. In collaborating with K- 12 teachers, undergraduate student participants discover the importance of teamwork in science and the need for effective communication of scientific results to a broad audience. The questions that K-12 teachers ask require the scientists and students in our program to explain their work in terms that non-specialists can understand and appreciate. The K-12 teacher provides a positive career role model and several Svalbard REU undergraduate students have pursued K-12 teaching careers after graduating. TREC teachers benefit from working alongside the researchers and by experiencing the adventures of real scientific research in a remote arctic environment. They return to their schools with a heightened status that allows them to share the excitement and importance of scientific research with their students. Together, all parties contribute to greatly enhance public outreach. With ARCUS logistical support, TREC teachers and researchers do live web conferences from the field, reaching hundreds of students and dozens of school administrators and even local politicians. Teachers maintain web journals, describing the daily activities and progress of the researcher team. Online readers from around the world write in to ask questions, which the

  16. Corneal arcus and its relationship with atherosclerosis in familial hypercholesterolemia%家族性高胆固醇血症患者角膜弓及其与动脉硬化之间关系

    Institute of Scientific and Technical Information of China (English)

    郭佳; 汪军; 蔺洁; 勇强; 孟忻; 高新晓; 辛晨; 刘广峰

    2012-01-01

    目的 探讨家族性高胆固醇血症(familial hypercholesterolemia,FH)患者角膜弓及其与动脉硬化之间的关系.方法 选取2011年1月至2012年3月于北京安贞医院心肺血管研究所随访的FH患者14例.采集静脉血得到四项血脂数值;眼科检查确定角膜弓分级;颈总动脉彩色多普勒明确左、右颈总动脉内中膜厚度,以其最厚处的内-中膜厚度来表示其动脉硬化程度.分析角膜弓与血脂、角膜弓与年龄、角膜弓与动脉硬化之间的关系.结果 14例FH患者血脂总胆固醇(12.95±5.24)mmol· L-1、低密度脂蛋白(9.89±4.28)mmol · L-1,与正常对照组(4.03±0.54 )mmol·L-1、(2.17±0.47)mmol·L-相比,差异均有显著统计学意义(均为P<0.01).14例FH患者的角膜弓与年龄间有相关性(r=0.580,P=0.030)、与动脉硬化之间有相关性:左侧颈总动脉(r=0.548,P=0.042),右侧颈总动脉(r=0.692,P=0.006).结论 FH患者中角膜弓的程度与年龄及动脉硬化之间存在正相关性.%Objective To investigate the comeal arcus and its relationship with atherosclerosis in familial hypercholesterolemia ( FH). Methods Fourteen patients with FH from January 2011 to March 2012 at Institute of Heart Lung and Blood Vessel Diseases, Beijing Anzhen Hospital were observed. The venous blood was obtained to measure the four plasma lipoproteins,grade of corneal arcus was made,and the interior-media thickness (IMT) of carotid artery was measured by color Doppler. Results The concentrations of total cholesterol and low density lipoproteins of FH patients were (12.95±5.24)mmol · L-1 and (9. 89 ±4. 28)mraol · L-1,compared with the normal control cases (4.03 ±0.54)mmol · L-1 and (2.17 ±0.47)mmol · L -1 ,there were significant differences (both P < 0.01). There were positive correlations between the grade of corneal arcus and age(r = 0.580,P = 0.030) ,the same result between the grade of corneal arcus and atherosclerosis: left carotid artery (r = 0.548 ,P=0

  17. 睑袋整形术同时行眶隔脂肪释放与填充剂矫正泪槽畸形的疗效对比%The contrast of effect of arcus marginalis release and orbital fat preservation and filler in treating tear trough deformity in eyelid bags of plastic surgery

    Institute of Scientific and Technical Information of China (English)

    张连生; 高俊明; 刘中策

    2012-01-01

    Objective To contrast the curative effect of arcus marginalis release and orbital fat preservation and filler in treating tear trough deformity on the aging of facial plastic surgery of the eyelid bags. Methods 46 cases of lower eyelid bags were operated, including 33 cases of eyelid bags plastic surgery incision, dissected the skin flap about 1cm area .designed orbicularis oculi incision beyond the skin incision 4mm and cut it, separated orbicularis muscle from orbital septum to the orbital rim, released the orbital fascia ligament (Wang ligament) .separated supporting ligaments of lower eyelid from the orbital rim, and separated the orbicularis muscle from the orbital rim about 1 ~2cm area on periosteum, taken arcus marginalis release and orbital fat preservation. If the orbital fat is more enough and some the fat was removed to local area smooth. Removed excess orbicularis oculi muscle and local skin . skin incision was sutured. The other 13 cases of eyelid bags of plastic surgery were, just not released of orbital fat, as above and the filler treated the tear trough deformity after operation 2 months. Results In 46 cases of eyelid bags plastic surgery, 33 cases of arcus marginalis release and orbital fat preservation were perfect effect by-following 3-12 months. The other 13 cases of filler include 5 cases of Artecoll and 8 cases of hyaluronic acid. The Artecoll group, the tear trough deformity was corrected and the hyaluronic acid group,the tear trough deformity was still evident by-following 3~12m. Conclusion Arcus marginalis release and orbital fat preservation is a good process for the eyelid bags with tear trough deformity.Fillers can solve the tear trough deformity, but fillers have timeliness and some complications.so the plastic surgery of the eyelid bags do not remove easily the orbital fat.%目的:对中面部老化在睑袋整形术的同时矫正泪槽畸形采用眶隔脂肪释放与填充剂矫正的疗效进行对比.方法:46

  18. Larval memory affects adult nest-mate recognition in the ant Aphaenogaster senilis

    OpenAIRE

    Signorotti, Lisa; Jaisson, Pierre; D'Ettorre, Patrizia

    2014-01-01

    Prenatal olfactory learning has been demonstrated in a wide variety of animals, where it affects development and behaviour. Young ants learn the chemical signature of their colony. This cue-learning process allows the formation of a template used for nest-mate recognition in order to distinguish alien individuals from nest-mates, thus ensuring that cooperation is directed towards group members and aliens are kept outside the colony. To date, no study has investigated the possible effect of cu...

  19. Senilia senilis (Linnaeus, 1758), a biogenic archive of environmental conditions on the Banc d'Arguin (Mauritania)

    NARCIS (Netherlands)

    Lavaud, R.; Thébault, J.; Lorrain, A.; van der Geest, M.; Chauvaud, L.

    2013-01-01

    Environmental archives are useful tools for describing past and current climate variations and they provide an opportunity to assess the anthropogenic contribution in coastal ecological changes. Along the West African coast, few studies have focused on such archives in coastal ecosystems. The bloody

  20. Linie Aquavit : taste that really travels

    OpenAIRE

    Flåten, Mats; Knudsen, Øyvind L.; Rosted, Ulrik; Rønning, Kim-André S.; Settemsdal, Simen E.

    2011-01-01

    This thesis presents the findings from a mainly descriptive research study about Chinese students‟ attitude towards alcohol and food. The research has been conducted on behalf of Arcus AS, from here on referred to as Arcus, concerning their long term goal of launching their product Linie Aquavit on the Chinese mainland market. In order to do this, Arcus needs to know more about their future target consumer segment in the Chinese market. Together, Arcus and the authors decided to do a research...

  1. Notes on the Nest Architecture of Halictus senilis (Eversmann) in Southeast Kazakhstan (Hymenoptera, Halictidae)

    OpenAIRE

    Miyanaga, Ryoichi; Tadauchi, Osamu; Murao,Ryuki

    2006-01-01

    Four nests of Halictus senilis (Eversmann) were excavated near Chimkent, southeast Kazakhstan. The nest of H. senilis was similar in structure to nests of the other species of Halictus s. s., i.e., each cell directly, not by means of lateral, connected to the main burrow. On the other hand, the deviation from the typical nest structure of Halictus was found. The coexistence of delayed eusocial and solitary nests was suggested in this species.

  2. Significance of lenticular opacity from the view point of the exposure dose of A-bomb radiation

    International Nuclear Information System (INIS)

    Two cases of lenticular opacity were discussed from the view point of exposure dose of A-bomb radiation. Case 1: female, 22 year and 5 months old when she was exposured to A-bomb radiation. The presumed exposure dose was 482.0 rad. Cataract due to A-bomb radiation. Case 2: female, 21 years and 6 months old when she was exposured to A-bomb radiation. The presumed exposure dose was more than 1,000 rad. Cataract due to A-bomb radiation and incipient cataract senilis. It was reported here that there was a marked difference in opacity findings of cataract due to A-bomb radiation in accordance with difference in exposure dose of radiation. It was also presumed from the findings of incipient cataract senilis that with increasing exposure dose, the aging phenomenon was promoted. (Y. Tsukamoto)

  3. What effects has the cataract surgery on the development and progression of Age-Related Macular Degeneration (AMD)?

    OpenAIRE

    Bockelbrink, A; Rasch, A; Roll, S.; Willich, SN; Greiner, W

    2006-01-01

    Background The cataract (Cataracta senilis) is the most frequent eye disease of elderly people worldwide. In Germany, the cataract operation - with currently 450,000 interventions each year the most frequent operation in ophthalmology - can be seen as routine surgery. The age related macular degeneration (AMD) is a further one of the most common, age-related eye diseases and the most frequent cause of blindness of elderly people in industrial nations. Due to demographic changes an increasing ...

  4. What effects has the cataract surgery on the development and progression of Age-Related Macular Degeneration (AMD)?

    OpenAIRE

    Willich, Stefan N.; Roll, Stephanie; Rasch, Andrej; Bockelbrink, Angelina; Greiner, Wolfgang

    2006-01-01

    Background: The cataract (Cataracta senilis) is the most frequent eye disease of elderly people worldwide. In Germany, the cataract operation - with currently 450,000 interventions each year the most frequent operation in ophthalmology – can be seen as routine surgery. The age related macular degeneration (AMD) is a further one of the most common, age-related eye diseases and the most frequent cause of blindness of elderly people in industrial nations. Due to demographic changes an increasing...

  5. Intraspecific competition affects population size and resource allocation in an ant dispersing by colony fission

    OpenAIRE

    Boulay, Raphaël; Galarza, Juan A.; Chéron, Blandine; Hefetz, Abraham; Lenoir, Alain; Van Oudenhove, Louise; Cerdá, Xim

    2010-01-01

    Intraspecific competition is a pervasive phenomenon with important ecological and evolutionary consequences, yet its effect in natural populations remains controversial. Although numerous studies suggest that in many cases populations across all organisms are limited by density-dependent processes, this conclusion often relies on correlative data. Here, using an experimental approach, we examined the effect of intraspecific competition on population regulation of the ant Aphaenogaster senilis...

  6. Better Together: Research Findings on the Relationship between Racial Justice Organizations and LGBT Communities. Report

    Science.gov (United States)

    Sen, Rinku; Wessler, Seth; Apollon, Dominique

    2010-01-01

    In partnership with the Arcus Foundation, the Applied Research Center (ARC) has undertaken a study of the relationship between racial justice organizations and lesbian/gay/bisexual/transgender (LGBT) constituencies and issues, with the understanding that communities of color themselves, including their LGBT members, have a good deal at stake in…

  7. Estrategias alternativas en el ciclo de vida de tres hormigas mediterráneas

    OpenAIRE

    Cerdá, Xim; Retana Alumbreros, Javier

    1992-01-01

    Se ha estudiado el ciclo biológico de tres especies de hormigas mediterráneas, y se han constatado importantes diferencias entre ellas. Cataglyphis cursor hibema sin descendencia y completa un ciclo de nidada entre los meses de abril y septiembre. Aphaenogaster senilis hibema sin nidada y produce pupas durante un amplio periodo de tiempo, desde abril hasta octubre, aunque los valores mtiximos (que coinciden con el pico de actividad exterior) se dan en primavera y principio de verano. Ambas es...

  8. Variability of Seed Traits in Interspecific and Intergeneric Combinations between Different Genotypes of Cactaceae

    Directory of Open Access Journals (Sweden)

    Lucica MIHALTE

    2010-12-01

    Full Text Available Based on aesthetic consideration of cacti plants and germination capacity of the pollen grains (more than 30%, 19 genotypes of cacti (including Aylostera narvaecensis, A. buiningiana, Rebutia kupperiana var. spiniflorum, R. donaldiana have been used in cyclic cross-pollination pattern. Fruits and seeds obtained from 24 interspecific and intergeneric combinations were analyzed by studying their main traits. The highest weight was registered for fruit belonging to R. pseudodeminuta var. schumaniana x R. senilis (23.3 mg and A. buiningiana x A. vallegardensis (20.4 mg. Coefficient of variability for fruit weight had large amplitude, between 12.3% (A. spinosissima x A. albiflora and 98.4% (A. favistyla x A. archibuinigiana. The fruits belonging to A. muscula x A. vallegardensis were registered with the highest value of number of seeds/fruit (93.2. In the cross between genera, the greatest value of fruits weights mean was registered on R. senilis x A. archibuinigiana (29.2 mg and R. cajasensis x A. muscula (23.1 mg. Peculiarities of the fruits and seeds resulted from intergeneric combinations presented closer connections than interspecific ones. The phenotypic traits of fruits and seeds did not influence the seeds germination, but germination was clearly influenced by compatibility between genitors.

  9. Sea Ice Prediction Has Easy and Difficult Years

    Science.gov (United States)

    Hamilton, Lawrence C.; Bitz, Cecilia M.; Blanchard-Wrigglesworth, Edward; Cutler, Matthew; Kay, Jennifer; Meier, Walter N.; Stroeve, Julienne; Wiggins, Helen

    2014-01-01

    Arctic sea ice follows an annual cycle, reaching its low point in September each year. The extent of sea ice remaining at this low point has been trending downwards for decades as the Arctic warms. Around the long-term downward trend, however, there is significant variation in the minimum extent from one year to the next. Accurate forecasts of yearly conditions would have great value to Arctic residents, shipping companies, and other stakeholders and are the subject of much current research. Since 2008 the Sea Ice Outlook (SIO) (http://www.arcus.org/search-program/seaiceoutlook) organized by the Study of Environmental Arctic Change (SEARCH) (http://www.arcus.org/search-program) has invited predictions of the September Arctic sea ice minimum extent, which are contributed from the Arctic research community. Individual predictions, based on a variety of approaches, are solicited in three cycles each year in early June, July, and August. (SEARCH 2013).

  10. 在非X线检测下AF系统固定胸腰椎骨折——附20例报告

    Institute of Scientific and Technical Information of China (English)

    王道成; 李孝福; 董延璜; 胡廷军; 黄道文; 王峰; 周玉宽; 武红军; 王海伦

    2005-01-01

    Objective To investigate treatment fracture of thoracolumbar vertebrae by AF system.Methods Direct incise and with AF system opening and fixing fracture of thoracolumbar vertebrae,putting nail in from roots of arcus vertebrae Without guiding of X-ray by persistant anaesthesia of cavitas epidurails. Results 80%-90% restoration of vertebras shape was 70% ,90%-100% restoration of vertebras shape was 30%,restoration of vertebras shape was very well in all cases. Conclusion With preparation of mentation and skill, by AF system opening and fixing,putting nail in from roots of arcus vertebrae also can cure fracture of thoracolumbar vertebrae without guidling of X-ray machine with C-arm.

  11. Aufzeichnung einiger Parameter der Kiefergelenksführung durch unterschiedliche extraorale Registriersysteme - Vergleich der Handhabung und Ergebnisse

    OpenAIRE

    Orth, Bernhard

    2004-01-01

    Die instrumentelle Funktionsanalyse dient heute der Programmierung justierbarer Artikulatoren vor umfangreichen prothetischen Restaurationen, sowie der Diagnostik von Kiefergelenkserkrankungen. Für diese Zwecke wurde das System Arcus Pro der Firma KaVO EWL, Leutkirch, Deutschland entwickelt. Ziel der vorliegenden Untersuchung ist eine Äquivalenzprüfung mit bereits erprobten und zuverlässigen Systemen. Dies ist der Achsiograph 2 der SAM Präzisionstechnik, München, Deutschland und der CondyloCo...

  12. Common and Rare Causes of Spinal Dumbbell-Shaped Lesions Including a Chondrosarcoma That Primarily Developed in the Cervical Spine: A Case Report

    Directory of Open Access Journals (Sweden)

    Amirhossein Ghazavi

    2009-01-01

    Full Text Available Various neoplastic, vascular and developmental causes may lead to spinal neural foraminal widening. Schwanomas and neurofibromas are the most common causes of spinal dumbbell-shaped lesions. Occasionally, some other slow-growing tumors may cause neural foraminal widening."nWe report an exceptional case of a spinal chondrosarcoma of the neural arcus of C5. The lesion passed through the C4-C5 foramen, producing a dumbbell mass.

  13. Xanthoma Tendinosum And Familial Hypercholesterolemia

    Directory of Open Access Journals (Sweden)

    Mahajan Vikram K

    2003-01-01

    Full Text Available A 40 year old female presented with multiple tendon xanthomas over extensor tendons of hands and feet, xanthelasma palpebrarum, arcus corneae and early atherosclerosis of retinal vessels. Investigations revealed normal triglycerides, very high plasma cholesterol and LDL levels, consistent with familial hypercholesterolemia (Fredrickson type lla. A work-up for cardiovascular involvement was normal and biopsy from one of the nodules showed xanthoma cells.

  14. Homozygous familial hypercholesterolemia associated with symmetric subcutaneous lipomatosis

    OpenAIRE

    Noha Mohammed Dawoud; Ola Ahmed Bakry; Iman Seleit

    2015-01-01

    Homozygous familial hypercholesterolemia is an autosomal dominant disorder of lipid metabolism, characterized by reduced clearance of low-density lipoprotein-cholesterol and a high risk of rapid development of cardiovascular diseases. Its incidence is relatively rare and estimated to be one in one million in general populations. Here, we report homozygous familial hypercholesterolemia in two Egyptian young siblings, presented with cutaneous, tendinous xanthomas, and corneal arcus. One of them...

  15. PolarTREC-Teachers and Researchers Exploring and Collaborating: Innovative Science Education from the Poles to the World

    Science.gov (United States)

    Warnick, W. K.; Warburton, J.; Breen, K.; Wiggins, H. V.; Larson, A.; Behr, S.

    2006-12-01

    PolarTREC-Teachers and Researchers Exploring and Collaborating is a three-year (2007-2009) teacher professional development program celebrating the International Polar Year (IPY) that will advance polar science education by bringing K-12 educators and polar researchers together in hands-on field experiences in the Arctic and Antarctic. PolarTREC builds on the strengths of the existing TREC program in the Arctic, an NSF supported program managed by the Arctic Research Consortium of the US (ARCUS), to embrace a wide range of activities occurring at both poles during and after IPY. PolarTREC will foster the integration of research and education to produce a legacy of long-term teacher-researcher collaborations, improved teacher content knowledge through experiences in scientific inquiry, and broad public interest and engagement in polar science and IPY. PolarTREC will enable thirty-six teachers to spend two to six weeks in the Arctic or Antarctic, working closely with researchers investigating a wide range of IPY science themed topics such as sea-ice dynamics, terrestrial ecology, marine biology, atmospheric chemistry, and long-term climate change. While in the field, teachers and researchers will communicate extensively with their colleagues, communities, and hundreds of students of all ages across the globe, using a variety of tools including satellite phones, online journals, podcasts and interactive "Live from IPY" calls and web-based seminars. The online outreach elements of the project convey these experiences to a broad audience far beyond the classrooms of the PolarTREC teachers. In addition to field research experiences, PolarTREC will support teacher professional development and a sustained community of teachers, scientists, and the public through workshops, Internet seminars, an e-mail listserve, and teacher peer groups. For further information on PolarTREC, contact Wendy Warnick, ARCUS Executive Director at warnick@arcus.org or 907-474-1600 or visit www.arcus.org/trec/

  16. Jaw myology and bite force of the monk parakeet (Aves, Psittaciformes).

    Science.gov (United States)

    Carril, Julieta; Degrange, Federico J; Tambussi, Claudia P

    2015-07-01

    Psittaciform birds exhibit novelties in jaw bone structure and musculature that are associated with strong bite forces. These features include an ossified arcus suborbitalis and the muscles ethmomandibularis and pseudomasseter. We analyse the jaw musculature of the monk parakeet (Myiopsitta monachus) to enable future studies aimed at understanding craniofacial development, morphology, function and evolution. We estimate bite force based on muscle dissections, physiological cross-sectional area and skull biomechanical modelling. We also compare our results with available data for other birds and traced the evolutionary origin of the three novel diagnostic traits. Our results indicate that, in Myiopsitta, (i) the arcus suborbitalis is absent and the orbit is ventrally closed by an elongate processus orbitalis and a short ligamentum suborbitale; (ii) the ethmomandibularis muscle is a conspicuous muscle with two bellies, with its origin on the anterior portion of the septum interorbitale and insertion on the medial aspect of the mandible; (iii) the pseudomasseter muscle consists of some fibers arising from the m. adductor mandibulae externus superficialis, covering the lateral surface of the arcus jugalis and attaches by an aponeurotic sheet on the processus orbitalis; (iv) a well-developed adductor mandibulae complex is present; (v) the bite force estimation relative to body mass is higher than that calculated for other non-psittaciform species; and (vi) character evolution analysis revealed that the absence of the arcus suborbitalis and the presence of the m. pseudomassseter are the ancestral conditions, and mapping is inconclusive about presence of one or two bellies of the m. ethmomandibularis. PMID:26053435

  17. PolarTREC-Teachers and Researchers Exploring and Collaborating: Bringing Polar Research to the Classroom

    Science.gov (United States)

    Warnick, W. K.; Warburton, J.; Breen, K.; Wiggins, H. V.; Larson, A.; Behr, S.

    2006-12-01

    PolarTREC-Teachers and Researchers Exploring and Collaborating is a three-year (2007-2009) teacher professional development program that pairs K-12 teachers with researchers to improve science education through authentic polar research experience. PolarTREC builds on the strengths of the existing TREC program in the Arctic, an NSF supported program managed by the Arctic Research Consortium of the US (ARCUS), to embrace a wider range of research activities in the Arctic and Antarctic. PolarTREC uses a Teacher Research Experience (TRE) model to foster the integration of research and education to produce a legacy of long-term teacher-researcher collaborations, improved teacher content knowledge through experiences in scientific inquiry, and broad public interest and engagement in polar science. PolarTREC will enable thirty-six teachers to spend two to six weeks in the Arctic or Antarctic, working closely with researchers investigating a wide range of topics such as sea-ice dynamics, terrestrial ecology, marine biology, atmospheric chemistry, and long-term climate change. With the help of their host researcher and the research team, teachers will develop the experience and tools necessary to teach science through scientific inquiry and investigation based on real-world experiences. While in the field, teachers and researchers will communicate extensively with their colleagues, communities, and hundreds of students of all ages across the globe, using a variety of tools including satellite phones, online journals, podcasts and interactive "Live from IPY" calls and web-based seminars. The online outreach elements of the project convey these experiences to a broad audience far beyond the classrooms of the PolarTREC teachers. In addition to field research experiences, PolarTREC will support teacher professional development and a sustained community of teachers, scientists, and the public through workshops, Internet seminars, an e-mail listserve, and ongoing teacher

  18. Case Report: Atypical Cornelia de Lange Syndrome.

    Science.gov (United States)

    Leanza, Vito; Rubbino, Gabriella; Leanza, Gianluca

    2014-01-01

    Cornelia de Lange Syndrome (CdLS) (also called Bushy Syndrome or Amsterdam dwarfism), is a genetic disorder that can lead to several alterations. This disease affects both physical and neuropsychiatric development. The various abnormalities include facial dysmorphia (arched eyebrows, synophrys, depressed nasal bridge, long philtrum, down-turned angles of the mouth), upper-extremity malformations, hirsutism, cardiac defects, and gastrointestinal alterations. The prevalence of this syndrome is approximately one per 15,000. Ultrasound is not the perfect means to diagnose CdLS, however, many abnormalities can be detected prenatally by scrupulous image observation. We report an atypical CdLS case characterized by increased nuchal translucency in the first trimester, normal karyotype, saddle nose, micrognathia with receding jaw, low set ears, facies senilis, arthrogryposis of the hands, absence of the Aranzio ductus venous, dilatation of gallbladder and bowel, a unique umbilical artery, increased volume of amniotic fluid, and intrauterine growth retardation ending with the interruption of pregnancy. PMID:26834972

  19. Sensitivity of linear CCD array based film scanners used for film dosimetry

    International Nuclear Information System (INIS)

    Film dosimetry is commonly performed by using linear CCD array transmission optical densitometers. However, these devices suffer from a variation in response along the detector array. If not properly corrected for, this nonuniformity may lead to significant overestimations of the measured dose as one approaches regions close to the edges of the scanning region. In this note, we present measurements of the spatial response of an AGFA Arcus II document scanner used for radiochromic film dosimetry. Results and methods presented in this work can be generalized to other CCD based transmission scanners used for film dosimetry employing either radiochromic or radiographic films

  20. Sensitivity of linear CCD array based film scanners used for film dosimetry.

    Science.gov (United States)

    Devic, Slobodan; Wang, Yi-Zhen; Tomic, Nada; Podgorsak, Ervin B

    2006-11-01

    Film dosimetry is commonly performed by using linear CCD array transmission optical densitometers. However, these devices suffer from a variation in response along the detector array. If not properly corrected for, this nonuniformity may lead to significant overestimations of the measured dose as one approaches regions close to the edges of the scanning region. In this note, we present measurements of the spatial response of an AGFA Arcus II document scanner used for radiochromic film dosimetry. Results and methods presented in this work can be generalized to other CCD based transmission scanners used for film dosimetry employing either radiochromic or radiographic films. PMID:17153378

  1. Disease: H00959 [KEGG MEDICUS

    Lifescience Database Archive (English)

    Full Text Available gene) Poulaki V, Colby K Genetics of anterior and stromal corneal dystrophies. Semin Ophthalmol 23:9-17 (2008) ... ...d a diffuse haze. In approximately 50% of cases, crystals are not evident clinically (Schnyder crystalline d...ia is common, and so are associated manifestations, such as arcus lipoides and xanthelasma.... Over time, an initially unremarkable corneal stroma acquires small white opacities an...(SCD) is a corneal dystrophy that is characterized by deposition of cholesterol in the corneal stroma. SCD u

  2. Perspectives of cesarean section in buffaloes

    Institute of Scientific and Technical Information of China (English)

    G N Purohit; Mitesh Gaur; Amit Kumar; Chandra Shekher; Swati Ruhil

    2013-01-01

    Cesarean section in buffaloes is an emergency operative procedure being performed prinicipally for uncorrectable uterine torsions and for delivery of fetal monsters. Left paramedian (lateral and parallel to the milk vein) and oblique ventrolateral (above arcus cruralis) are the two common operative sites used for buffalo caesarean section. Although many anesthetic combinations including intravenous and inhalation anesthetic procedures have been experimented in the buffalo species yet most caesarean sections in buffaloes are satisfactorily performed in right lateral recumbency under mild sedation and local infiltration analgesia or paravertebral nerve blocks. The history, indications, anesthesia, operative procedures, post operative complications and future fertility following caesarean section in buffalo are described.

  3. Homozygous familial hypercholesterolemia associated with symmetric subcutaneous lipomatosis

    Directory of Open Access Journals (Sweden)

    Noha Mohammed Dawoud

    2015-01-01

    Full Text Available Homozygous familial hypercholesterolemia is an autosomal dominant disorder of lipid metabolism, characterized by reduced clearance of low-density lipoprotein-cholesterol and a high risk of rapid development of cardiovascular diseases. Its incidence is relatively rare and estimated to be one in one million in general populations. Here, we report homozygous familial hypercholesterolemia in two Egyptian young siblings, presented with cutaneous, tendinous xanthomas, and corneal arcus. One of them has symmetric subcutaneous lipomatosis, which has not been reported before in association with familial hypercholesterolemia.

  4. Familial hypercholesterolemia with multiple cutaneous xanthomas

    Directory of Open Access Journals (Sweden)

    Reddy BSN

    2006-01-01

    Full Text Available An interesting episode of homozygous familial hypercholesterolemia affecting four children born to a consanguinous parents belonging to two different families is reported for its rarity. The patients had multiple cutaneous xanthomas including the characteristic xanthoma tendinosum, xanthoma interosseum, xanthoma tuberosum, and xanthelasma palpebrarum. Prominent corneal arcus juvenalis has been noted in three children. Gross elevation of serum levels of low density lipoprotein cholesterol (LDLc with normal values of triglycerides have been found in all patients. They have been prescribed medication with oral tablets of simvastatin and advised fat restricted diet and regular follow up in the clinic at periodic intervals.

  5. Collaboration in Arctic Research: Best Practices to Build and Sustain Successful Cross- and Trans-disciplinary Efforts

    Science.gov (United States)

    Wiggins, H. V.; Rich, R. H.

    2015-12-01

    The rapid physical and social changes currently underway in the Arctic - and changes in the way in which we study and manage the region -- require coordinated research efforts to improve our understanding of the Arctic's physical, biological, and social systems and the implications of change at many scales. At the same time, policy-makers and Arctic communities need decision-support tools and synthesized information to respond and adapt to the "new Arctic". There are enormous challenges, however, in collaboration among the disparate groups of people needed for such efforts. A carefully planned strategic approach is required to bridge the scientific disciplinary and organizational boundaries, foster cooperation between local communities and science programs, and effectively communicate between scientists and policy-makers. Efforts must draw on bodies of knowledge from project management, strategic planning, organizational development, and group dynamics. This poster presentation will discuss best practices of building and sustaining networks of people to catalyze successful cross-disciplinary activities. Specific examples and case studies - both successes and failures -- will be presented that draw on several projects at the Arctic Research Consortium of the U.S. (ARCUS; www.arcus.org), a nonprofit membership organization composed of universities and institutions that have a substantial commitment to research in the Arctic.

  6. The Arctic Visiting Speakers Program

    Science.gov (United States)

    Wiggins, H. V.; Fahnestock, J.

    2013-12-01

    The Arctic Visiting Speakers Program (AVS) is a program of the Arctic Research Consortium of the U.S. (ARCUS) and funded by the National Science Foundation. AVS provides small grants to researchers and other Arctic experts to travel and share their knowledge in communities where they might not otherwise connect. The program aims to: initiate and encourage arctic science education in communities with little exposure to arctic research; increase collaboration among the arctic research community; nurture communication between arctic researchers and community residents; and foster arctic science education at the local level. Individuals, community organizations, and academic organizations can apply to host a speaker. Speakers cover a wide range of arctic topics and can address a variety of audiences including K-12 students, graduate and undergraduate students, and the general public. Preference is given to tours that reach broad and varied audiences, especially those targeted to underserved populations. Between October 2000 and July 2013, AVS supported 114 tours spanning 9 different countries, including tours in 23 U.S. states. Tours over the past three and a half years have connected Arctic experts with over 6,600 audience members. Post-tour evaluations show that AVS consistently rates high for broadening interest and understanding of arctic issues. AVS provides a case study for how face-to-face interactions between arctic scientists and general audiences can produce high-impact results. Further information can be found at: http://www.arcus.org/arctic-visiting-speakers.

  7. Case Report: Atypical Cornelia de Lange Syndrome [version 2; referees: 1 approved, 2 approved with reservations

    Directory of Open Access Journals (Sweden)

    Vito Leanza

    2015-05-01

    Full Text Available Cornelia de Lange Syndrome (CdLS (also called Bushy Syndrome or Amsterdam dwarfism, is a genetic disorder that can lead to several alterations. This disease affects both physical and neuropsychiatric development. The various abnormalities include facial dysmorphia (arched eyebrows, synophrys, depressed nasal bridge, long philtrum, down-turned angles of the mouth, upper-extremity malformations, hirsutism, cardiac defects, and gastrointestinal alterations. The prevalence of this syndrome is approximately one per 15,000. Ultrasound is not the perfect means to diagnose CdLS, however, many abnormalities can be detected prenatally by scrupulous image observation. We report an atypical CdLS case characterized by increased nuchal translucency in the first trimester, normal karyotype, saddle nose, micrognathia with receding jaw, low set ears, facies senilis, arthrogryposis of the hands, absence of the Aranzio ductus venous, dilatation of gallbladder and bowel, a unique umbilical artery, increased volume of amniotic fluid, and intrauterine growth retardation ending with the interruption of pregnancy.

  8. SEARCH: Study of Environmental Arctic Change--A System-scale, Cross-disciplinary, Long-term Arctic Research Program

    Science.gov (United States)

    Wiggins, H. V.; Schlosser, P.; Loring, A. J.; Warnick, W. K.; Committee, S. S.

    2008-12-01

    Institution, and the U.S. Department of Agriculture (USDA). The U.S. Arctic Research Commission participates as an IPMC observer. For further information, please visit the website: http://www.arcus.org/search or contact: Helen V. Wiggins: helen@arcus.org, SEARCH Project Office, Arctic Research Consortium of the U.S. (ARCUS); or Peter Schlosser, schlosser@ldeo.columbia.edu, SEARCH SSC Chair.

  9. Precise radiochromic film dosimetry using a flat-bed document scanner

    International Nuclear Information System (INIS)

    In this study, a measurement protocol is presented that improves the precision of dose measurements using a flat-bed document scanner in conjunction with two new GafChromic registered film models, HS and Prototype A EBT exposed to 6 MV photon beams. We established two sources of uncertainties in dose measurements, governed by measurement and calibration curve fit parameters contributions. We have quantitatively assessed the influence of different steps in the protocol on the overall dose measurement uncertainty. Applying the protocol described in this paper on the Agfa Arcus II flat-bed document scanner, the overall one-sigma dose measurement uncertainty for an uniform field amounts to 2% or less for doses above around 0.4 Gy in the case of the EBT (Prototype A), and for doses above 5 Gy in the case of the HS model GafChromic registered film using a region of interest 2x2 mm2 in size

  10. Precise radiochromic film dosimetry using a flat-bed document scanner.

    Science.gov (United States)

    Devic, Slobodan; Seuntjens, Jan; Sham, Edwin; Podgorsak, Ervin B; Schmidtlein, C Ross; Kirov, Assen S; Soares, Christopher G

    2005-07-01

    In this study, a measurement protocol is presented that improves the precision of dose measurements using a flat-bed document scanner in conjunction with two new GafChromic film models, HS and Prototype A EBT exposed to 6 MV photon beams. We established two sources of uncertainties in dose measurements, governed by measurement and calibration curve fit parameters contributions. We have quantitatively assessed the influence of different steps in the protocol on the overall dose measurement uncertainty. Applying the protocol described in this paper on the Agfa Arcus II flat-bed document scanner, the overall one-sigma dose measurement uncertainty for an uniform field amounts to 2% or less for doses above around 0.4 Gy in the case of the EBT (Prototype A), and for doses above 5 Gy in the case of the HS model GafChromic film using a region of interest 2 X 2 mm2 in size. PMID:16121579

  11. Recurrent Inguinal Hernia in Children%小儿复发性腹股沟疝(附18例报告)

    Institute of Scientific and Technical Information of China (English)

    刘宝善; 朴庆云

    1983-01-01

    @@ 我院1976年3月至1982年4月,六年阃共收治小儿复发性腹股沟疝18例(我院做过的8例).现将复发原因,治疗方法,防止措施诸方面结合文献进行探讨.%In the past 6 years,18 patients with recurrent inguinal hernia have been admitted.The recurrence was attributed to lower ligation of the sac and damage to fascia transversalis.To prevent reccurrence,the author suggests that,on the basis of high ligation of the sac,the operation should be performed around the fascia transversalis.It consists of:(1) simple high ligation of the sac,adequate and firm enough to achieve smooth arcus of fascia pelvis parietalis,and (2) suturing of fascia transversalis fissure as to make it contracted.

  12. Visible aging signs as risk markers for ischemic heart disease

    DEFF Research Database (Denmark)

    Christoffersen, Mette; Tybjærg-Hansen, Anne

    2016-01-01

    Association of common aging signs (i.e., male pattern baldness, hair graying, and facial wrinkles) as well as other age-related appearance factors (i.e., arcus corneae, xanthelasmata, and earlobe crease) with increased risk of ischemic heart disease was initially described in anecdotal reports from...... clinicians observing trends in the physical appearance of patients with ischemic heart disease. Following these early observations numerous epidemiological studies have reported these associations. Since the prevalences of both visible aging signs and ischemic heart disease have a strong correlation with......, and are mostly speculative. As a consequence of inconsistent findings and lack of mechanistic explanations for the observed associations with ischemic heart disease, consensus on the clinical importance of these visible aging signs has been lacking. The aim of this review is for each of the visible...

  13. Spontaneous perforation of a syphilitic aneurysm of the aortic arch into the pulmonary artery

    International Nuclear Information System (INIS)

    An aortopulmonary fistula in case of a bag-shaped aneurysm of the aortic arch is demonstrated via angiography. A diagnosis to the effect that the existence of this phenomenon is suspected, can already be arrived at when examining the plain radiography of the thorax. We can say that a sign of an aortopulmonary fistula is represented, in case of an aneurysm of the aorta ascendens and of the arcus aortae, by the existence of a left-right shunt with hypercirculation in the pulmonary circulation, in most cases also signs of right ventricular insufficiency. This is often combined with a typical previous history of sudden dyspnoeas and thoracic pain. The article points out the theoretical possibility of balloon catheter occlusion of the fistula to relieve the acute right ventricular load. (orig.)

  14. New insights into muscle function during pivot feeding in seahorses.

    Directory of Open Access Journals (Sweden)

    Sam Van Wassenbergh

    Full Text Available Seahorses, pipefish and their syngnathiform relatives are considered unique amongst fishes in using elastic recoil of post-cranial tendons to pivot the head extremely quickly towards small crustacean prey. It is known that pipefish activate the epaxial muscles for a considerable time before striking, at which rotations of the head and the hyoid are temporarily prevented to allow energy storage in the epaxial tendons. Here, we studied the motor control of this system in seahorses using electromyographic recordings of the epaxial muscles and the sternohyoideus-hypaxial muscles with simultaneous high-speed video recordings of prey capture. In addition we present the results from a stimulation experiment including the muscle hypothesised to be responsible for the locking and triggering of pivot feeding in seahorses (m. adductor arcus palatini. Our data confirmed that the epaxial pre-activation pattern observed previously for pipefish also occurs in seahorses. Similar to the epaxials, the sternohyoideus-hypaxial muscle complex shows prolonged anticipatory activity. Although a considerable variation in displacements of the mouth via head rotation could be observed, it could not be demonstrated that seahorses have control over strike distance. In addition, we could not identify the source of the kinematic variability in the activation patterns of the associated muscles. Finally, the stimulation experiment supported the previously hypothesized role of the m. adductor arcus palatini as the trigger in this elastic recoil system. Our results show that pre-stressing of both the head elevators and the hyoid retractors is taking place. As pre-activation of the main muscles involved in pivot feeding has now been demonstrated for both seahorses and pipefish, this is probably a generalized trait of Syngnathidae.

  15. Social coercion of larval development in an ant species

    Science.gov (United States)

    Villalta, Irene; Amor, Fernando; Cerdá, Xim; Boulay, Raphaël

    2016-04-01

    Ants provide one of the best examples of the division of labor in animal societies. While the queens reproduce, workers generally refrain from laying eggs and dedicate themselves exclusively to domestic tasks. In many species, the small diploid larvae are bipotent and can develop either into workers or queens depending mostly on environmental cues. This generates a conflicting situation between the adults that tend to rear a majority of larvae into workers and the larvae whose individual interest may be to develop into reproductive queens. We tested the social regulation of larval caste fate in the fission-performing ant Aphaenogaster senilis. We first observed interactions between resident workers and queen- and worker-destined larvae in presence/absence of the queen. The results show that workers tend to specifically eliminate queen-destined larvae when the queen is present but not when she is absent or imprisoned in a small cage allowing for volatile pheromone exchanges. In addition, we found that the presence of already developed queen-destined larvae does not inhibit the development of younger still bipotent larvae into queens. Finally, we analyzed the cuticular hydrocarbon profiles of queen- and worker-destined larvae and found no significant quantitative or qualitative difference. Interestingly, the total amount of hydrocarbons on both larval castes is extremely low, which lends credence on the chemical insignificance hypothesis of larval ants. Overall, our results suggest that workers control larval development and police larvae that would develop into queens instead of workers. Such policing behavior is similar in many aspects to what is known of worker policing among adults.

  16. Bone and skin defects of forefoot repaired by ailograft and complex flap with periosteum%异体骨移植带骨膜的复合皮瓣修复前足骨和皮肤缺损

    Institute of Scientific and Technical Information of China (English)

    钟广铃; 左中男

    2001-01-01

    Objective To report the clinic result of bone and skin defects of forefoot and defects of forefoot treated by allograft and complex flap of crural artery with nerve and periosteum. Methods Allograft and complex flap with periosteum of tibien were used to repair bone and skin defects of forefoot in 9 cases ,in which the defects of forefeet were reconstructed by sequential connection with the complex flaps of tibialis posterior artery with saphenous nerve and periosteum in 2 cases. Results Six cases were survived completely;distal part in surface layer of flaps were necrosis partly in 3 cases and healed by dressing. After operation ,the repaired bone and joint showed normal position and recovered arcus pedis transversalis and arcus pedis longitudinalis by X-ray films. The patients were followedup from 3 months to 3 years,all grafted allograft had showed bone union and hadnt showed complications such as absorption,infection and repulsion. The injuried foot was restored its weight-bearing and walking functions and obtained a satisfactory contour. After operation,sensory recovery of foot occurred about 2 months. Conclusion Used allograft is easy to do and recover arcus plantaris. The reverse complex flaps of tibialis anterior artery with periosteum have advantages as follow :the advoidance of influencing blood supply of injuried foot ,advancing symphysis ,short treatment course,simply procedure ,walking functions recovered ,good appearance and sensation.%目的报道应用同种异体骨移植带骨膜和神经的小腿动脉复合组织瓣修复前足骨和皮肤缺损以及前足再造的临床应用效果。方法采用异体骨移植、带胫骨骨膜的复合皮瓣修复前足骨和皮肤缺损9例,其中串联带隐神经和骨膜的胫后动脉复合组织瓣修复前足2例。结果6例皮瓣全部成活,3例皮瓣远端表层部分坏死,经换药创面愈合。术后X线复查,移植异体骨对位好,恢复了足的横弓和纵弓。本组随访3

  17. SEARCH: Study of Environmental Arctic Change—A System-scale, Cross-disciplinary Arctic Research Program

    Science.gov (United States)

    Wiggins, H. V.; Eicken, H.; Fox, S. E.

    2012-12-01

    permafrost, land ice and sea level, and societal and policy implications. Together, the goals will provide significant insight into arctic system change as a whole. The SEARCH SSC will release the goals in their revised form and then work closely with agency representatives to implement the goals through research opportunities and community activities. SEARCH is guided by a Science Steering Committee and several panels and working groups, with broad representation of the research community. SEARCH is sponsored by eight U.S. agencies, including: the National Science Foundation (NSF), the National Oceanic and Atmospheric Administration (NOAA), the National Aeronautics and Space Administration (NASA), the Department of Defense (DOD), the Department of Energy (DOE), the Department of the Interior (DOI), the Smithsonian Institution, and the U.S. Department of Agriculture (USDA). The U.S. Arctic Research Commission participates as an agency observer. For further information, please visit the website: http://www.arcus.org/search or contact: Helen V. Wiggins: helen@arcus.org, SEARCH Project Office, Arctic Research Consortium of the U.S. (ARCUS).

  18. Arctic Visiting Speakers Series (AVS)

    Science.gov (United States)

    Fox, S. E.; Griswold, J.

    2011-12-01

    . Hosts must acknowledge the National Science Foundation Office of Polar Programs and ARCUS in all promotional materials. Host agrees to send ARCUS photographs, fliers, and if possible a video of the main lecture. Host and speaker agree to collect data on the number of attendees in each audience to submit as part of a post-tour evaluation. The grants can generally cover all the expenses of a tour, depending on the location. A maximum of 2,000 will be provided for the travel related expenses of a speaker on a domestic visit. A maxiμm of 2,500 will be provided for the travel related expenses of a speaker on an international visit. Each speaker will receive an honorarium of $300.

  19. Dose distribution around a needle-like anode X-ray tube: Dye-film vs. planar thermoluminescent detectors

    International Nuclear Information System (INIS)

    The dosimetry around the X-ray tube with a needle-like anode (NAXT), developed at the Inst. of Nuclear Studies, for interstitial brachytherapy has been performed using (1) dye films (Gafchromic XR-T), (2) large-area thermoluminescent (TL) detectors - prepared either by gluing TL powder onto thin Al foil (so-called planar detectors with spatial resolution of 0.1 mm) and (3) miniature (2 mm diameter and 0.5 mm thick) TL detectors. The measurements were performed in following geometries. (1) Needle inside a PMMA cylinder - the planar TL detector mounted on the surface of the cylinder. (2) Needle inside a thick block of PMMA and TL detector mounted vertically 7 mm from needle axis. TL detectors were read with the planar (2D) thermoluminescence reader, developed at IFJ, with a sensitive CCD (charge couple device) camera. Gafchromic films were evaluated with a system based on Agfa Arcus 1200 scanner and calibrated with X-rays (35 kV) filtered with 0.03 mm Mo and with Co-60 photons. The intensity distribution of TL light on the planar detector was calibrated in terms of absorbed dose to water, using 137Cs gamma-rays. TL planar detectors seem to be a promising tool for 2D dosimetry of miniature X-ray sources. Obtained results for TLDs and Gafchromic films seem to be comparable but differences have been found. Both methods are useful for measurements of dose distribution around the NAXT X-rays source. (authors)

  20. Fine mapping of the Schnyder's crystalline corneal dystrophy locus.

    Science.gov (United States)

    Theendakara, Veena; Tromp, Gerard; Kuivaniemi, Helena; White, Peter S; Panchal, Seema; Cox, Jennifer; Winters, R Scott; Riebeling, Petra; Tost, Frank; Hoeltzenbein, Maria; Tervo, Timo M; Henn, Wolfram; Denniger, Elke; Krause, Matthias; Koksal, Murat; Kargi, Sebnem; Ugurbas, Suat H; Latvala, Terho; Shearman, Amanda M; Weiss, Jayne S

    2004-05-01

    Schnyder's crystalline corneal dystrophy (SCCD) is a rare autosomal dominant eye disease with a spectrum of clinical manifestations that may include bilateral corneal clouding, arcus lipoides, and anterior corneal crystalline cholesterol deposition. We have previously performed a genome-wide linkage analysis on two large Swede-Finn families and mapped the SCCD locus to a 16-cM interval between markers D1S2633 and D1S228 on chromosome 1p36. We have collected 11 additional families from Finland, Germany, Turkey, and USA to narrow the critical region for SCCD. Here, we have used haplotype analysis with densely spaced microsatellite markers in a total of 13 families to refine the candidate interval. A common disease haplotype was observed among the four Swede-Finn families indicating the presence of a founder effect. Recombination results from all 13 families refined the SCCD locus to 2.32 Mbp between markers D1S1160 and D1S1635. Within this interval, identity-by-state was present in all 13 families for two markers D1S244 and D1S3153, further refining the candidate region to 1.58 Mbp. PMID:15034782

  1. Dimensions of the lumbar spinal canal: variations and correlations with somatometric parameters using CT

    International Nuclear Information System (INIS)

    The aim of this study was to investigate the correlation of vertebral dimensions with somatometric parameters in patients without clinical symptoms and radiological signs of central lumbar spinal stenosis. One hundred patients presenting with low back pain or sciatica were studied with CT. In each of the L3, L4 and L5 vertebra three slices were taken with the following measurements: 1. Slice through the intervertebral disc: (a) spinal canal area; (b) interarticular diameter; (c) interligamentous diameter. 2. Slice below the vertebral arcus: (a) dural sac area; (b) vertebral body area. 3. Pediculolaminar level: (a) anteroposterior diameter and interpedicular diameter of the spinal canal; (b) spinal canal area; (c) width of the lateral recesses. The Jones-Thomson index was also estimated. The results of the present study showed that there is a statistically significant correlation of height, weight and age with various vertebral indices. The conventional, widely accepted, anteroposterior diameter of 11.5 mm of the lumbar spinal canal is independent of somatometric parameters, and it is the only constant measurement for the estimation of lumbar spinal stenosis with a single value. The present study suggests that there are variations of the dimensions of the lumbar spinal canal and correlations with height, weight and age of the patient. (orig.)

  2. Dimensions of the lumbar spinal canal: variations and correlations with somatometric parameters using CT

    Energy Technology Data Exchange (ETDEWEB)

    Karantanas, A.H. [Department of CT-MRI, Larissa General Hospital (Greece); Zibis, A.H.; Papaliaga, M.; Georgiou, E.; Rousogiannis, S. [Larissa Medical School, University of Thessaly, Larissa (Greece)

    1998-12-01

    The aim of this study was to investigate the correlation of vertebral dimensions with somatometric parameters in patients without clinical symptoms and radiological signs of central lumbar spinal stenosis. One hundred patients presenting with low back pain or sciatica were studied with CT. In each of the L3, L4 and L5 vertebra three slices were taken with the following measurements: 1. Slice through the intervertebral disc: (a) spinal canal area; (b) interarticular diameter; (c) interligamentous diameter. 2. Slice below the vertebral arcus: (a) dural sac area; (b) vertebral body area. 3. Pediculolaminar level: (a) anteroposterior diameter and interpedicular diameter of the spinal canal; (b) spinal canal area; (c) width of the lateral recesses. The Jones-Thomson index was also estimated. The results of the present study showed that there is a statistically significant correlation of height, weight and age with various vertebral indices. The conventional, widely accepted, anteroposterior diameter of 11.5 mm of the lumbar spinal canal is independent of somatometric parameters, and it is the only constant measurement for the estimation of lumbar spinal stenosis with a single value. The present study suggests that there are variations of the dimensions of the lumbar spinal canal and correlations with height, weight and age of the patient. (orig.) With 1 fig., 6 tabs., 24 refs.

  3. A Novel Technique for Anterior Vaginal Wall Prolapse Repair: Anterior Vaginal Wall Darn

    Directory of Open Access Journals (Sweden)

    Osman Köse

    2013-01-01

    Full Text Available Aim. The aim of this study is to introduce a new technique, anterior vaginal wall darn (AVWD, which has not been used before to repair the anterior vaginal wall prolapse, a common problem among women. Materials and Methods. Forty-five women suffering from anterior vaginal wall prolapse were operated on with a new technique. The anterior vaginal wall was detached by sharp and blunt dissection via an incision beginning from the 1 cm proximal aspect of the external meatus extending to the vaginal apex, and the space between the tissues that attach the lateral walls of the vagina to the arcus tendineus fascia pelvis (ATFP was then darned. Preoperation and early postoperation evaluations of the patients were conducted and summarized. Results. Data were collected six months after operation. Cough stress test (CST, Pelvic Organ Prolapse Quantification (POP-Q evaluation, Incontinence Impact Questionnaire (IIQ-7, and Urogenital Distress Inventory (UDI-6 scores indicated recovery. According to the early postoperation results, all patients were satisfied with the operation. No vaginal mucosal erosion or any other complications were detected. Conclusion. In this initial series, our short-term results suggested that patients with grade II-III anterior vaginal wall prolapsus might be treated successfully with the AVWD method.

  4. Detecting the Missing Metals and Missing Baryons Through X-Ray Spectroscopy

    Science.gov (United States)

    Bregman, Joel N.; Miller, Matthew J.; Hodges-Kluck, Edmund J.

    2016-04-01

    About 90% of the metals produced in the universe and 50% of the baryons are unaccounted for through UV-IR and radio studies of stars and gas. This large amount of missing gas and metals likely lies in a hot phase (0.5-10x106 K) and must be enriched to about 0.2-0.3 of the solar metallicity, so it should be a good absorber of X-rays in the resonance lines of common elements. Both existing data and simulations predict that hot galactic halos have N(H) ~1-10x1019 cm-2 and EW(OVII) = 3-10 mÅ, which are best studied with instruments that can resolve the lines, as the estimated line widths are 100-200 km/s. This sort of resolution and sensitivity is possible with grating spectroscopy of the type envisioned for missions such as Arcus and X-Ray Surveyor. These same instruments can probe the dynamics of the gas, and when applied to the halo of the Milky Way, can determine the rates of rotation and infall (or outflow) and the degree of turbulence.

  5. Sequences of cytochrome b gene for primitive cyprinid fishes in East Asia and their phylogenetic concerning

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    1140 bp of cytochrome b gene were amplified and sequenced from 14species of primitive cyprinid fishes in East Asia. Aligned with other ten cytochrome b gene sequences of cyprinid fish from Europe and North America retrieved from Gene bank, we obtained a matrix of 24 DNA sequences. A cladogram was generated by the method of Maximum likelihood for the primitive cyprinid fishes. The result indicated that subfamily Leuciscinae and Danioninae do not form a monophyletic group. In the subfamily Danioninae, Opsariichthys biden and Zacco platypus are very primitive and form a natural group and located at the root. But the genera in subfamily Danioninae are included in different groups and have not direct relationship. Among them, Aphyocypris chinensis and Yaoshanicus arcus form a monophyletic group. Tanichthys albonubes and Gobiocypris rarus have a close relation to Gobioninae. The genus Danio is far from other genera in Danioninae. In our cladogram, the genera in Leuciscinae were divided into two groups that have no direct relationship. The genera in Leuciscinae distributed in Europe, Sibera and North America, including Leuciscus, Rutilus, Phoxinus, N. crysole, Opsopoeodus emilae, form a monophyletic group. And the Leuciscinae in southern China including Ctenopharyngodon idellus, Mylopharyngodon piceus, Squalibarbus and Ochetobius elongatus have a common origination.

  6. Anatomical Position of Four Different Transobturator Mesh Implants for Female Anterior Prolapse Repair.

    Science.gov (United States)

    Lenz, F; Doll, S; Sohn, C; Brocker, K A

    2013-10-01

    Purpose: Polypropylene mesh implants are frequently used for pelvic floor reconstruction in women. Yet they vary in size and fixation. The purpose of this study is to compare four mesh products with regard to their anatomical positioning and functionality within the pelvic floor, to determine whether each mesh fits equally well in a female cadaver. Methods: One female pelvis was dissected, opening the retropubic space exposing the endopelvic fascia and demonstrating the arcus tendineus fasciae pelvis (ATFP). Anatomical parameters were measured before and after implanting four meshes via the transobturator approach. Results: The anterior fixation of the ATFP was found to be 5 mm lateral to the symphysis in this cadaver. The endopelvic fascia covered 54.6 cm(2). The obturator nerve was located 35 mm from the white line. The distance of the proximal and lateral points of mesh fixation from the ischial spine or ATFP varied from 0 to 25 mm. The meshes varied in size and anatomical positioning. Conclusion: These observations demonstrate the necessity of developing optimally sized meshes and appropriate introducer techniques that can provide sufficient vaginal support. Surgeons, furthermore, need profound knowledge of anatomy, the patient's pelvic floor defect and the meshes available on the market. PMID:24771893

  7. control study from India

    Directory of Open Access Journals (Sweden)

    Amitesh Aggarwal

    2014-03-01

    Full Text Available Introduction: The role of the conventional risk factors in premature coronary artery disease (CAD after eliminating the confounding variability of smoking has not been evaluated. This study was conducted to identify role of traditional risk factors in smokers with premature CAD.Methods: The case records of patients presenting acutely with premature CAD during the period 2007-2010 were analyzed retrospectively. Age, sex and smoking matched controls were selected from same time period. Data records were obtained for family history, alcohol, waist size, blood pressure, hypertension, blood sugar, lipid profile and presence of cutaneous markers for both groups and analyzed using statistical software.Results: 234 smokers with CAD and 122 smokers without CAD were included in groups 1 and 2, respectively. The patients in group 1 had significantly increased prevalence of hypertension, diabetes mellitus, metabolic syndrome, dyslipidemia and central obesity. There was no difference in prevalence of family history of CAD, arcus juvenilis and baldness. We found statistically significant association of hypertension, DM and metabolic syndrome in young smokers with premature acute CAD in Indian population as compared to young smokers without CAD.Conclusion: In young smokers, presence of hypertension, central obesity, diabetes mellitus and metabolic syndrome identifies a subset at increased risk for future acute CAD requiring more rigorous follow up and treatment.

  8. Ballistic parameters and trauma potential of carbon dioxide-actuated arrow pistols.

    Science.gov (United States)

    Nguyen, Tien Thanh; Grossjohann, Rico; Ekkernkamp, Axel; Bockholdt, Britta; Frank, Matthias

    2015-05-01

    Medical literature abounds with reports of injuries and fatalities caused by arrows and crossbow bolts. Crossbows are of particular forensic and traumatological interest, because their mode of construction allows for temporary mechanical storage of energy. A newly developed type of pistol (Arcus Arrowstar), which belongs to the category of air and carbon dioxide weapons, discharges arrow-shaped bolts actuated by carbon dioxide cylinders. As, to the best of the authors' knowledge, literature contains no information on this uncommon subclass of weapons it is the aim of this work to provide the experimental data and to assess the trauma potential of these projectiles based on the ascertained physical parameters. Basic kinetic parameters of these carbon dioxide-actuated bolts (velocity v = 39 m/s, energy E = 7.2 J, energy density E' = 0.26 J/mm(2)) are similar to bolts discharged by pistol crossbows. Subsequent firing resulted in a continuous and fast decrease in kinetic energy of the arrows. Test shots into ballistic soap blocks reveal a high penetration capacity, especially when compared to conventional projectiles of equal kinetic energy values (like, e.g., airgun pellets). To conclude, these data demonstrate the high efficiency of arrow-shaped projectiles, which are also characterized by a high cross-sectional density (ratio of mass to cross-sectional area of a projectile). PMID:25246008

  9. Single-stage repair of adult aortic coarctation and concomitant cardiovascular pathologies: a new alternative surgical approach

    Directory of Open Access Journals (Sweden)

    Saba Davit

    2006-06-01

    Full Text Available Abstract Background Coarctation of the aorta in the adulthood is sometimes associated with additional cardiovascular pathologies that require intervention. Ideal approach in such patients is uncertain. Anatomic left-sided short aortic bypass from the arcus aorta to descending aorta via median sternotomy allows simultaneuos repair of both complex aortic coarctation and concomitant cardiac operation. Materials Four adult patients were underwent Anatomic left-sided short aortic bypass operation for complex aortic coarctation through median sternotomy using deep hypothermic circulatory arrest. Concomitant cardiac operations were Bentall procedure for annuloaortic ectasia in one patient, coronary artery bypass grafting for three vessel disease in two patient, and patch closure of ventricular septal defect in one patient. Results All patients survived the operation and were alive with patent bypass at a mean follow-up of 36 months. No graft-related complications occurred, and there were no instances of stroke or paraplegia. Conclusion We conclude that single-stage repair of adult aortic coarctation with concomitant cardiovascular lesions can be performed safely using this newest technique.

  10. 贵州台江凯里组的遗迹化石Treptichnus%Ichnofossil Treptichnus from the Kaili Formation at Taijiang County, Guizhou Province

    Institute of Scientific and Technical Information of China (English)

    王约; 王平丽

    2006-01-01

    贵州台江下-中寒武统凯里组中产有丰富的、保存良好的Treptichnus Miller,计5个遗迹种(其中包括2个新遗迹种):T. bifurcus Miller,T. pedum(Seilacher),T. pollardi Buatois and Mángano,T. arcus n. ichnosp.和T. taijiangensis n. ichnosp.,并与节肢动物的觅食迹、爬行迹和游泳迹等共生,属Cruziana遗迹相.产于凯里组的Treptichnus可能为节肢动物的居住迹.随着造迹生物身体的增长和沉积物的增厚,造迹生物在原潜穴的基础上不断地开拓新的潜穴,而构成三维空间复杂的潜穴系统.

  11. Chemo killed the small-talk gene.

    Science.gov (United States)

    Vaid, Urvashi

    2014-01-01

    Urvashi Vaid is a community organizer and writer active in the lesbian, gay, bisexual, and transgender (LGBT) and social justice movements for over three decades. She is currently Director of the Engaging Tradition Project at the Center for Gender and Sexuality Law at Columbia University Law School. She is founder of LPAC, the first lesbian political action committee, and sits on the Board of Directors of the Gill Foundation. Vaid's past positions include Executive Director of the Arcus Foundation, Deputy Director of Governance and Civil Society Unit for the Ford Foundation, Executive Director of the National Gay and Lesbian Task Force, and staff attorney for the ACLU National Prison Project. She is author of the books Irresistible Revolution: Confronting Race, Class and The Assumptions of Lesbian, Gay, Bisexual, and Transgender Politics, and Virtual Equality: The Mainstreaming of Gay & Lesbian Liberation, and co-editor of the book Creating Change: Public Policy, Sexuality and Civil Rights. Urvashi has had thyroid cancer and stage III breast cancer. PMID:24400627

  12. Epilithic Algal Diversity of Cimil Stream (Rize, Turkey

    Directory of Open Access Journals (Sweden)

    Beyhan Taş

    2015-10-01

    Full Text Available The Ikizdere Valley is one of priority ecologic region within 200 areas where is under protection in the world. It is natural conservation area. In this study, epilithic algal diversity of Cimil Stream in the Cimil (Tiron Valley where is one of the most important protection areas were investigated. The ecological structure of the stream is to determine by using indicator algae. According to sampling results obtained from four different stations after rainy and dry seasons (November 2010 and August 2011, total 113 taxa belongs to five different division were identified. Diatoms have the most species diversity in terms of other groups (74, 65%. This was followed by Cyanophyta (28, 25%, Charophyta (6, 5%, Chlorophyta (4, 4% and Euglenophyta (1, 1%. Achnanthidium minutissimum, Cocconeis pediculus, C. placentula, Cymbella affinis, Gomphonema parvulum, G. truncatum, Encyonema minutum, Hannaea arcus, Navicula menisculus, N. salinarum ve Nitzschia palea are common and dominant diatom species in the Cimil Stream. Indicator species showed that the ecological situation of the Cimil Stream is not yet under intense pressure pollution. However, it is seen that the stream showed a change towards β-α-mesosaprobic conditions from oligosaprobic top to bottom. For the area's tourism potential is very high, it is recommended that the necessary measures take as to maintaining ecological structure in future.

  13. Structure and seasonal variability of fish food webs in an estuarine tropical marine protected area (Senegal): Evidence from stable isotope analysis

    Science.gov (United States)

    Faye, Djibril; Tito de Morais, Luis; Raffray, Jean; Sadio, Oumar; Thiaw, Omar Thiom; Le Loc'h, François

    2011-05-01

    West African tropical estuaries play an important role in the growth and survival of many commercially exploited fish species and enable the sustainability of considerable artisanal fishery yields. However, their trophic functioning remains poorly understood. In the Sine Saloum estuary (Senegal), a marine protected area (MPAs) was designated in 2003 to manage fisheries resources. The present study aimed to determine the structure, trophic functioning and seasonal patterns of the fish assemblages in this MPA. Throughout the study, 28 fish species were collected, with higher values of biomass (3826 kg km -2) recorded during the wet season and lower values during the dry season (1228 kg km -2). Fish assemblages in both seasons were dominated by species with marine affinity, which accounted for 87% of the total biomass in the wet season and 70% in the dry season, with their abundance varying from 83% to 57%, respectively. Based on stable isotopic composition (δ 13C and δ 15N), species were combined into trophic groups. Primary consumers were partitioned into suspensivores (pelagic copepods, oysters and mussels), which fed mainly on particulate organic matter, and intermediate consumers, feeding on freshly deposited organic matter and benthic microalgae ( Sarotherodon melanotheron and Arca senilis). Secondary consumers were divided into three groups. The first group included mullet, which fed by grazing on benthic microalgae (benthic affinity feeders). The second group, pelagic affinity feeders, was the most heterogeneous and fed mainly on pelagic components. The last secondary consumer group termed the intermediate group, included piscivores and benthic and pelagic invertebrate feeders, which dominated the top of the food web. The food chain in October was lengthened due to the occurrence of tertiary consumers. Food webs were dominated by secondary consumers, which constituted 89% of total biomass in the dry season and 71% in the wet season. The fish food web varied

  14. Engaging Scientists in K-12 Professional Development and Curriculum Development in the Context of Alaska's Large Marine Ecosystems

    Science.gov (United States)

    Sigman, M.; Anderson, A.; Deans, N. L.; Dublin, R.; Dugan, D.; Matsumoto, G. I.; Warburton, J.

    2012-12-01

    Alaska marine ecosystem-based professional development workshops have proven to be a robust context for engaging scientists from a variety of disciplines in overcoming barriers to communication and collaboration among scientists and educators. Scientists came away from scientist-teacher workshops with effective K-12 outreach strategies as well as a deeper understanding about how to contribute meaningfully to K-12 education. The establishment of the Alaskan Center for Ocean Sciences Education Excellence (COSEE-AK) in 2009 was the catalyst for a series of professional development workshops related to the North Pacific Research Board's (NPRB) marine focus areas (Bering Sea/Aleutian Islands, Gulf of Alaska, and Arctic Ocean) for Integrated Ecosystem Research Programs (IERPs). During 2010-2012, COSEE-AK and NPRB partnered with the Arctic Research Consortium of the U.S. (ARCUS), the Alaska Ocean Observing System (AOOS), and the Monterey Bay Aquarium Research Institute (MBARI) to support a five-day professional development workshop focused on each ecosystem. The workshops brought together three types of participants: 1) Alaska-focused marine ecosystem scientists; 2) rural Alaskan teachers living within each ecosystem; and 3) teachers from outside Alaska who had research experiences with scientists in the ecosystem. Over the course of the workshops, we developed a workshop model with four objectives: 1) to increase the science content knowledge of educators and their ability to teach ecosystem science; 2) to provide the scientists an opportunity to have broader impacts from their research on educators and Alaska Native and rural students; 3) to increase the knowledge and skills of educator and scientist participants to provide effective learning experiences for K-12 students; and 4) to facilitate the collaborative development of lesson plans. A total of 28 scientists and 41 educators participated in the three workshops. The success of the workshop for the educators was

  15. Incorporating Web 2.0 Technologies from an Organizational Perspective

    Science.gov (United States)

    Owens, R.

    2009-12-01

    The Arctic Research Consortium of the United States (ARCUS) provides support for the organization, facilitation, and dissemination of online educational and scientific materials and information to a wide range of stakeholders. ARCUS is currently weaving the fabric of Web 2.0 technologies—web development featuring interactive information sharing and user-centered design—into its structure, both as a tool for information management and for educational outreach. The importance of planning, developing, and maintaining a cohesive online platform in order to integrate data storage and dissemination will be discussed in this presentation, as well as some specific open source technologies and tools currently available, including: ○ Content Management: Any system set up to manage the content of web sites and services. Drupal is a content management system, built in a modular fashion allowing for a powerful set of features including, but not limited to weblogs, forums, event calendars, polling, and more. ○ Faceted Search: Combined with full text indexing, faceted searching allows site visitors to locate information quickly and then provides a set of 'filters' with which to narrow the search results. Apache Solr is a search server with a web-services like API (Application programming interface) that has built in support for faceted searching. ○ Semantic Web: The semantic web refers to the ongoing evolution of the World Wide Web as it begins to incorporate semantic components, which aid in processing requests. OpenCalais is a web service that uses natural language processing, along with other methods, in order to extract meaningful 'tags' from your content. This metadata can then be used to connect people, places, and things throughout your website, enriching the surfing experience for the end user. ○ Web Widgets: A web widget is a portable 'piece of code' that can be embedded easily into web pages by an end user. Timeline is a widget developed as part of the

  16. Dose distribution around a needle-like anode X-ray tube: dye-film vs. planar thermoluminescent detectors.

    Science.gov (United States)

    Budzanowski, M; Olko, P; Marczewska, B; Czopyk, L; Slapa, M; Stras, W; Traczyk, M; Talejko, M

    2006-01-01

    The dosimetry around the X-ray tube with a needle-like anode (NAXT), developed at the Institute of Nuclear Studies, for interstitial brachytherapy has been performed using (1) dye films (Gafchromic XR-T), (2) large-area thermoluminescent (TL) detectors--prepared either by gluing TL powder onto thin Al foil (so-called planar detectors with spatial resolution of 0.1 mm) and (3) miniature (2 mm diameter and 0.5 mm thick) TL detectors. The measurements were performed in following geometries. (1) Needle inside a PMMA cylinder--the planar TL detector mounted on the surface of the cylinder. (2) Needle inside a thick block of PMMA and TL detector mounted vertically 7 mm from needle axis. TL detectors were read with the planar (2D) thermoluminescence reader, developed at IFJ, with a sensitive CCD (charge couple device) camera. Gafchromic films were evaluated with a system based on Agfa Arcus 1200 scanner and calibrated with X rays (35 kV) filtered with 0.03 mm Mo and with Co-60 photons. The intensity distribution of TL light on the planar detector was calibrated in terms of absorbed dose to water, using (137)Cs gamma-rays. TL planar detectors seem to be a promising tool for 2D dosimetry of miniature X-ray sources. Obtained results for TLDs and Gafchromic films seem to be comparable but differences have been found. Both methods are useful for measurements of dose distribution around the NAXT X-rays source. PMID:16614087

  17. Dosimetric properties of improved GafChromic films for seven different digitizers

    International Nuclear Information System (INIS)

    Two recently introduced GafChromic film models, HS and XR-T, have been developed as more sensitive and uniform alternatives to GafChromic MD-55-2 film. The HS model has been specifically designed for measurement of absorbed dose in high-energy photon beams (above 1 MeV), while the XR-T model has been introduced for dose measurements of low energy (0.1 MeV) photons. The goal of this study is to compare the sensitometric curves and estimated dosimetric uncertainties associated with seven different GafChromic film dosimetry systems for the two new film models. The densitometers tested are: LKB Pharmacia UltroScan XL, Molecular Dynamics Personal Densitometer, Nuclear Associates Radiochromic Densitometer Model 37-443, Photoelectron Corporation CMR-604, Laser Pro 16, Vidar VXR-16, and AGFA Arcus II document scanner. Pieces of film were exposed to different doses in a dose range from 0.5 to 50 Gy using 6 MV photon beam. Functional forms for dose vs net optical density have been determined for each of the GafChromic film-dosimetry systems used in this comparison. Two sources of uncertainties in dose measurements, governed by the experimental measurement and calibration curve fit procedure, have been compared for the densitometers used. Among the densitometers tested, it is found that for the HS film type the uncertainty caused by the experimental measurement varies from 1% to 3% while the calibration fit uncertainty ranges from 2% to 4% for doses above 5 Gy. Corresponding uncertainties for XR-T film model are somewhat higher and range from 1% to 5% for experimental and from 2% to 7% for the fit uncertainty estimates. Notwithstanding the significant variations in sensitivity, the studied densitometers exhibit very similar precision for GafChromic film based dose measurements above 5 Gy

  18. Dosimetric properties of improved GafChromic films for seven different digitizers.

    Science.gov (United States)

    Devic, Slobodan; Seuntjens, Jan; Hegyi, Gyorgy; Podgorsak, Ervin B; Soares, Christopher G; Kirov, Assen S; Ali, Imad; Williamson, Jeffrey F; Elizondo, Angel

    2004-09-01

    Two recently introduced GafChromic film models, HS and XR-T, have been developed as more sensitive and uniform alternatives to GafChromic MD-55-2 film. The HS model has been specifically designed for measurement of absorbed dose in high-energy photon beams (above 1 MeV), while the XR-T model has been introduced for dose measurements of low energy (0.1 MeV) photons. The goal of this study is to compare the sensitometric curves and estimated dosimetric uncertainties associated with seven different GafChromic film dosimetry systems for the two new film models. The densitometers tested are: LKB Pharmacia UltroScan XL, Molecular Dynamics Personal Densitometer, Nuclear Associates Radiochromic Densitometer Model 37-443, Photoelectron Corporation CMR-604, Laser Pro 16, Vidar VXR-16, and AGFA Arcus II document scanner. Pieces of film were exposed to different doses in a dose range from 0.5 to 50 Gy using 6 MV photon beam. Functional forms for dose vs net optical density have been determined for each of the GafChromic film-dosimetry systems used in this comparison. Two sources of uncertainties in dose measurements, governed by the experimental measurement and calibration curve fit procedure, have been compared for the densitometers used. Among the densitometers tested, it is found that for the HS film type the uncertainty caused by the experimental measurement varies from 1% to 3% while the calibration fit uncertainty ranges from 2% to 4% for doses above 5 Gy. Corresponding uncertainties for XR-T film model are somewhat higher and range from 1% to 5% for experimental and from 2% to 7% for the fit uncertainty estimates. Notwithstanding the significant variations in sensitivity, the studied densitometers exhibit very similar precision for GafChromic film based dose measurements above 5 Gy. PMID:15487718

  19. Comparison of classical and probable heterozygous familial hypercholesterolemia cases with controls

    Directory of Open Access Journals (Sweden)

    Samia Perwaiz Khan

    2012-07-01

    Full Text Available Backgroud: Heterozygous familial hypercholesterolemia are either classical cases with high LDL-C levels, tendon xanthomas and LDL receptor gene mutation or probable cases with hypercholesterolemia without known LDL receptor gene mutations. Aims & Objectives: This study was done to compare the severity of hypercholesterolemia and risk of CVD in classical and probable cases of heterozygous familial hypercholesterolemia in tertiary care hospitals of Karachi. This was a case-series done from June 2008 to July 2010 at Dr Ziauddin Hospital and National Institute of Cardiovascular Diseases, Karachi, Pakistan. Methods: Out of more than 240 patients with dyslipidemia or premature coronary artery diseases 120 patients who had primary hypercholesterolemia and were found to have total cholesterol >230mg/dL and LDL-C >160mg/dL were included in the study. All these cases had premature coronary artery diseases or had a family history of coronary artery diseases. They were grouped as classical or probable cases depending on raised LDL-C, xanthelasmas, xanthoma, premature coronary artery diseases and LDL-R gene mutations. Their blood samples were collected after twelve hours fasting. PCR was done for mutation specific primers for exons 3, 4, 9 and 14. Results: Out of these 120 patients with heterozygous familial hypercholesterolemia, classical cases with LDL-receptor gene mutation were 42(35% and probable cases without LDL-receptor gene mutations were 78(65%. Eleven (27% of these classical cases had severe hypercholesterolemia having total cholesterol (>290mg/dL and LDL-C (>200mg/dL and were found to have xanthelasmas, xanthomas and arcus cornealis. Discussion/Conclusions: Amongst the HeFH patients from the tertiary care hospitals of Karachi, classical cases with tendon xanthomas and LDL receptor gene mutations had severe hypercholesterolemia with greater risk of CVD, they required more aggressive treatment. Probable cases were also at risk of CVD and needed

  20. Carotid intima-media thickness correlation with lipid profile in patients with familial hypercholesterolemia versus controls

    International Nuclear Information System (INIS)

    To determine the variations in carotid intima-media thickness (CIMT) in familial hypercholesterolemia (FH) patients and its use as predictive marker for premature cardiovascular diseases. Familial hypercholesterolemia was clinically diagnosed by premature coronary diseases, xanthomas, arcus cornealis and family history of premature coronary heart diseases. Controls were age matched normal individuals without hypercholesterolemia. Their lipid profile was tested after overnight fasting. CIMT was measured in mm using B-mode ultrasonography using linear probe. Student t-test was applied to compare mean CIMT of cases and the control. The mean CIMT values of the FH cases were correlated with LDL using Pearson's correlation test. Forty cases with hypercholesterolemia gave consent to participate in the study. These patients had total cholesterol 200 mg/dL and LDL 160 mg/dL as compared to twenty controls of similar age with total cholesterol ? 200 mg/dL and LDL 130 mg/dL. Mean CIMT for the cases was 0.77 + 0.18 mm while mean CIMT for control was 0.59 + 0.08 mm. The mean CIMT for the cases ranged from 0.7-1.83 mm and 0.48-0.73 mm for controls. Among the FH cases, 25% (n=11) had arterial plaques. Mean CIMT was significantly correlated to LDL-cholesterol (r 0.725**, p < 0.001). In this study, CIMT was found to be significantly increased in familial hypercholesterolemia and it correlated with raised LDL-cholesterol. Both are predictive of premature cardiovascular diseases. (author)

  1. Atlanto-Axial Instability in People with Down’s Syndrome and its Impact on the Ability to Perform Sports Activities – A Review

    Directory of Open Access Journals (Sweden)

    Myśliwiec Andrzej

    2015-12-01

    Full Text Available Atlanto-axial instability (AAI is a developmental anomaly often occurring in persons with Down’s syndrome (DS. According to various reports, AAI affects from 6.8 to 27% of the population with DS. The aim of this review was to illustrate the issue of AAI with regard to the progressively changing state of scientific knowledge. The extended distance between the rear surface of the frontal arcus of the C1 cervical vertebra and the anterior surface of C2 cervical vertebra dens (anterior atlanto-odontoid distance, AAOD indicates the occurrence of AAI and is detectable through X-ray examination. Hypoplasia of the C2 dens, also detectable through X-ray examination, is another suggested risk factor for AAI. According to current data, the methodology of taking measurements is inconsistent, which leads to errors in interpretation. As research focusing on AAI was progressing, new data emerged from other studies on persons with DS, suggesting that neurological symptoms in persons with DS that indicated the occurrence of spinal cord compression were an important factor in medical imaging detection of AAI. One of the main arguments supporting this thesis is that in isolated cases spinal cord (SC damage was noted during screening examinations conducted on a large population of subjects. Moreover, cases in which the neurological symptoms indicate spinal cord compression existed long before the occurrence of the actual damage also remain of significant importance. Therefore, it is necessary to promote neurological studies on persons with DS to enable early diagnosis of spinal cord compression and, at the same time, reduce the use of medical imaging in cases of neurological symptoms.

  2. PolarTREC-Teachers and Researchers Exploring and Collaborating: Science Education from the Poles to the World

    Science.gov (United States)

    Warnick, W. K.; Breen, K.; Warburton, J.; Fischer, K.; Wiggins, H.; Owens, R.; Polly, B.; Wade, B.; Buxbaum, T.

    2007-12-01

    PolarTREC-Teachers and Researchers Exploring and Collaborating is a three-year (2007-2009) teacher professional development program celebrating the International Polar Year (IPY) that advances polar science education by bringing K-12 educators and polar researchers together in hands-on field experiences in the Arctic and Antarctic. Currently in its second year, the program fosters the integration of research and education to produce a legacy of long-term teacher-researcher collaborations, improved teacher content knowledge through experiences in scientific inquiry, and broad public interest and engagement in polar science. Through PolarTREC, over 40 U.S. teachers will spend two to six weeks in the Arctic or Antarctic, working closely with researchers in the field as an integral part of the science team. Research projects focus on a wide range of IPY science themed topics such as sea-ice dynamics, terrestrial ecology, marine biology, atmospheric chemistry, and long-term climate change. While in the field, teachers and researchers will communicate extensively with their colleagues, communities, and hundreds of students of all ages across the globe, using a variety of tools including satellite phones, online journals, podcasts and interactive "Live from IPY" calls and web-based seminars. The online outreach elements of the project convey these experiences to a broad audience far beyond the classrooms of the PolarTREC teachers. In addition to field research experiences, PolarTREC will support teacher professional development and a sustained community of teachers, scientists, and the public through workshops, Internet seminars, an e-mail listserve, and teacher peer groups. To learn more about PolarTREC visit the website at: http://www.polartrec.com or contact info@polartrec.com or 907-474-1600. PolarTREC is funded by NSF and managed by the Arctic Research Consortium of the US (ARCUS).

  3. Phenotype, Body Composition, and Prediction Equations (Indian Fatty Liver Index for Non-Alcoholic Fatty Liver Disease in Non-Diabetic Asian Indians: A Case-Control Study.

    Directory of Open Access Journals (Sweden)

    Surya Prakash Bhatt

    Full Text Available In this study, we have attempted comparison of detailed body composition phenotype of Asian Indians with non-alcoholic fatty liver disease (NAFLD vs. those without, in a case controlled manner. We also aim to analyse prediction equations for NAFLD for non-diabetic Asian Indians, and compare performance of these with published prediction equations researched from other populations.In this case-control study, 162 cases and 173 age-and sex-matched controls were recruited. Clinical, anthropometric, metabolic, and body composition profiles, and liver ultrasound were done. Fasting insulin levels, value of homeostasis model assessment of insulin resistance (HOMA-IR, and serum high sensitive C-reactive protein (hs-CRP levels were evaluated. Multivariate logistic and linear regression analyses were used to arrive at prediction equations for fatty liver [Indian fatty liver index (IFLI].As compared to those without fatty liver, those with fatty liver exhibited the following; Excess dorsocervical fat ('Buffalo hump', skin tags, xanthelasma, 'double chin', arcus; excess total, abdominal and subcutaneous adiposity, and high blood pressure, blood glucose, measures of insulin resistance (fasting insulin and HOMA-IR values, lipids and hs-CRP levels. Two prediction equations were developed; Clinical [Indian Fatty Liver Index-Clinical; IFLI-C]: 1(double chin +15.5 (systolic blood pressure +13.8 (buffalo hump; and IFLI-Clinical and Biochemical (CB: serum triglycerides+12 (insulin+1(systolic blood pressure +18 (buffalo hump. On ROC Curve analysis, IFLI performed better than all published prediction equations, except one.Non-diabetic Asian Indians with NAFLD researched by us were overweight/obese, had excess abdominal and subcutaneous fat, multiple other phenotypic markers, had higher insulin resistance, glycemia, dyslipidemia and subclinical inflammation than those without. Prediction score developed by us for NAFLD; IFLI-C and IFLI-CB, should be useful for

  4. Evaluation of injuries of the upper cervical spine in a postmortem study with digital radiography, CT and MRI

    International Nuclear Information System (INIS)

    Purpose: To compare digital X-ray, CT, and MRI in the evaluation of ligamentous and osseous lesions in upper cervical spine specimens after artificial craniocervical injury with the findings of macroscopic preparation. Materials and Methods: A rotation trauma of defined severity was applied to 19 human corpses. After dissection of the neck specimens, digital X-ray (DIMA Soft P41, Feinfocus), conventional and helical CT (CTi, High Speed, GE, collimation 1 mm; pitch 1.0), and MRI were performed from the skull base to C3. The findings were correlated with the macroscopic results of preparation. MR (Magnetom Vision, Siemens) imaging was obtained with a 1.5 T system using 2D- and 3D-sequences. Results: Preparation revealed 6 fractures of the vertebral bodies, 5 fractures of the dens axis, 1 fracture of the arcus anterior of the atlas, 4 osseous flakes at the occipital condylus, and 6 lesions of the alar ligaments. Digital radiography showed all fractures and 4 osseous flakes at the occipital condylus. With conventional and helical CT, all fractures and all ruptured alar ligaments could be detected. 2D MRI depicted 9 of the fractures and 3D MRI showed fractures. With 2D MRI, 2 of the 4 osseous flakes at the condylus could be detected and with 3D MRI one occipital condylus fracture could be depicted. Ligamentous injuries were visualized by 2D MRI in 2 of 6 cases and by 3 D MRI inone case. Conclusions: In post-mortem studies, CT was superior to MRI in the visualization of osseous and ligamentous injuries after trauma of the upper cervical spine. However, these results are not transferable to patients with rotation injury in general. (orig.)

  5. Effect of atorvastatin therapy on oxidant-antioxidant status and atherosclerotic plaque formation

    Directory of Open Access Journals (Sweden)

    Sezer ED

    2011-06-01

    Full Text Available Ebru Demirel Sezer1, Eser Yildirim Sozmen1, Deniz Nart2, Taner Onat11Medical Biochemistry, 2Pathology Department, Ege University School of Medicine, Izmir, TurkeyBackground: The aim of this study was to determine the oxidant–antioxidant status and lipid peroxidation products, as well as paraoxonase and atherosclerotic plaque formation, in a hypercholesterolemic atherosclerosis rabbit model to investigate the effects of atorvastatin in the atherosclerotic process.Methods: Forty male New Zealand rabbits were divided into four groups, ie, a control group receiving standard pellets, a group receiving atorvastatin therapy, a hypercholesterolemic group receiving an atherogenic diet, and a group receiving both an atherogenic diet and atorvastatin.Results: The atherogenic diet increased the levels of low-density lipoprotein (LDL thiobarbituric acid reactive substances (1.84 vs 3.79 nmol/mg protein and LDL-conjugated diene (147 vs 318 µmol/mg protein after induction of oxidation by Cu2+, despite an increase of superoxide dismutase activity. Treatment with atorvastatin limited LDL oxidation significantly (LDL thiobarbituric acid reactive substances 2.19 nmol/mg protein, LDL-conjugated diene 222 µmol/mg protein. Paraoxonase, which prevents LDL oxidation and inactivates LDL-derived oxidized phospholipids, showed a pronounced decrease in the group receiving the atherogenic diet (110 U/L to 28 U/L, and atorvastatin treatment increased paraoxonase activity. Histological examination of arcus aorta tissues from the hypercholesterolemic group showed abundant plaque formation surrounding and obstructing the lumen, whereas treatment with atorvastatin prevented or limited plaque formation, keeping the plaque thin and localized.Conclusion: Atorvastatin has dramatic antiatherosclerotic effects, part of which seems to be due to the antioxidant features of the parent drug and/or its metabolites, favoring inhibition of LDL oxidation.Keywords: atherosclerosis

  6. Arctic Risk Management (ARMNet) Network: Linking Risk Management Practitioners and Researchers Across the Arctic Regions of Canada and Alaska To Improve Risk, Emergency and Disaster Preparedness and Mitigation Through Comparative Analysis and Applied Research

    Science.gov (United States)

    Garland, A.

    2015-12-01

    The Arctic Risk Management Network (ARMNet) was conceived as a trans-disciplinary hub to encourage and facilitate greater cooperation, communication and exchange among American and Canadian academics and practitioners actively engaged in the research, management and mitigation of risks, emergencies and disasters in the Arctic regions. Its aim is to assist regional decision-makers through the sharing of applied research and best practices and to support greater inter-operability and bilateral collaboration through improved networking, joint exercises, workshops, teleconferences, radio programs, and virtual communications (eg. webinars). Most importantly, ARMNet is a clearinghouse for all information related to the management of the frequent hazards of Arctic climate and geography in North America, including new and emerging challenges arising from climate change, increased maritime polar traffic and expanding economic development in the region. ARMNet is an outcome of the Arctic Observing Network (AON) for Long Term Observations, Governance, and Management Discussions, www.arcus.org/search-program. The AON goals continue with CRIOS (www.ariesnonprofit.com/ARIESprojects.php) and coastal erosion research (www.ariesnonprofit.com/webinarCoastalErosion.php) led by the North Slope Borough Risk Management Office with assistance from ARIES (Applied Research in Environmental Sciences Nonprofit, Inc.). The constituency for ARMNet will include all northern academics and researchers, Arctic-based corporations, First Responders (FRs), Emergency Management Offices (EMOs) and Risk Management Offices (RMOs), military, Coast Guard, northern police forces, Search and Rescue (SAR) associations, boroughs, territories and communities throughout the Arctic. This presentation will be of interest to all those engaged in Arctic affairs, describe the genesis of ARMNet and present the results of stakeholder meetings and webinars designed to guide the next stages of the Project.

  7. Distribution patterns of benthic diatoms during summer in the Niyang River, Tibet, China

    Institute of Scientific and Technical Information of China (English)

    PEI Guofeng; LIU Guoxiang

    2011-01-01

    The aim of this study was to investigate the distribution,density,community structure and biodiversity characteristics of benthic diatoms,and to analyze whether differences in species composition and abundance exist in different regions of the Niyang River,Tibet.Among the 157 taxa observed in 15 sampling sites in the main river and tributary,most were casual species (>100),the relative abundance of the genera Achnanthes and Fragilaria was 67% of the total relative abundance.Achnanthes minutissima was the most important species and dominated the whole river reaches (average relative abundance was 30%); the average diatom densities were 7.4× 105 cell/cm2 at all sites,and increased slowly from the upper section to downriver.The significant indicator taxa with higher relative abundance were Achnanthes biasolettiana (18.0%) and Fragilaria arcus (18.2%),Fragilaria capucina var.vaucheriae (31.2%),Fragilaria construens var.venter (11.3%) and Cymbella affinis (11.0%) in the upper,tributary and mid-river sections,respectively.Achnanthes minutissima was the most abundant species (56%) in the downriver section.Biodiversity indices showed a gradual decrease from the up- to down-river section,and dominant species were more abundant in the upper and mid-river sections than in the downriver section.A two-way indictor species analysis (TWINSPAN) of diatom composition clearly showed four different groups,namely the upper,mid,lower and tributary sections.Detrended correspondence analysis (DCA)supported the results of TW1NSPAN,and the characteristics of site distribution and species composition in the Niyang River supported the spatial structure of diatom assemblages.This study indicates that bio-assessment programs utilizing benthic diatoms could clearly benefit lotic water with regional stratification.

  8. PolarTREC-Teachers and Researchers Exploring and Collaborating: Science Education from the Poles to the World

    Science.gov (United States)

    Timm, K. M.; Warburton, J.; Owens, R.; Warnick, W. K.

    2008-12-01

    PolarTREC--Teachers and Researchers Exploring and Collaborating, a program of the Arctic Research Consortium of the U.S. (ARCUS), is a National Science Foundation (NSF)--funded International Polar Year (IPY) project in which K-12 educators participate in hands-on field experiences, working closely with IPY scientists as a pathway to improving science education. PolarTREC has developed a successful internet-based platform for teachers and researchers to interact and share their diverse experiences and expertise by creating interdisciplinary educational tools including online journals and forums, real-time Internet seminars, lesson plans, activities, audio, and other educational resources that address a broad range of scientific topics. These highly relevant, adaptable, and accessible resources are available to educators across the globe and have connected thousands of students and citizens to the excitement of polar science. By fostering the integration of research and education and infusing education with the thrill of discovery, PolarTREC will produce a legacy of long-term teacher-researcher collaborations and increased student knowledge of and interest in the polar regions well beyond the IPY time period. Educator and student feedback from preliminary evaluations has shown that PolarTREC's comprehensive program activities have many positive impacts on educators and their ability to teach science concepts and improve their teaching methods. Additionally, K-12 students polled in interest surveys showed significant changes in key areas including amount of time spent in school exploring research activities, importance of understanding science for future work, importance of understanding the polar regions as a person in today's world, as well as increased self-reported knowledge and interest in Science, Technology, Engineering, and Mathematics content areas. PolarTREC provides a tested approach and a clear route for researcher participation in the education community

  9. MRI assessment of mid-urethral ligament changes in female stress urinary incontinence

    International Nuclear Information System (INIS)

    Objective: To evaluate the MRI value in changes of mid-urethral ligament injury of female stress urinary incontinence (SUI). Methods: Comparison of MRI changes of mid-urethral ligament on 30 healthy female volunteers and 20 female SUI patients. Chi-square test was used to compare the form of SUI patient's mid-urethral support ligaments. Results: The female mid-urethral support ligaments were composed of 4 groups of ligaments, including the periurethral ligament and pubourethral ligaments (1 pair), and at both sides of the urethra's paraurethral ligaments (1 pair) and suburethral ligament lying dorsal urethra, connecting the urethra and pelvic arcus tendinous fasciae. In normal MRI, ligament was a thin strip and showed low signal on both T1WI and T2WI, T2WI sagittal and cross-section scan was the best combination to show the middle urethral support ligaments changes, with tension; 6 patients (20%) in the 30 patients normal control group could be seen tortuously and slack like around the urethra ligaments. Twenty SUI patients mid-urethral support ligaments were performance laxity or rupture,rates were 39% (47/120) and 42% (50/120) (χ2=43.191, P<0.05). On T2WI, the ligamentous laxity was floating,and loss tension, also could performance one side extension and thinner than the other side. The ligament rupture was performance of the signal interruption, ligament contracture and one end of ligament attachment points separation. Conclusion: MRI can objective effective evaluate the mid-urethral support ligaments' pathological changes in stress urinary incontinence patients. (authors)

  10. Atlanto-Axial Instability in People with Down's Syndrome and its Impact on the Ability to Perform Sports Activities - A Review.

    Science.gov (United States)

    Myśliwiec, Andrzej; Posłuszny, Adam; Saulicz, Edward; Doroniewicz, Iwona; Linek, Paweł; Wolny, Tomasz; Knapik, Andrzej; Rottermund, Jerzy; Żmijewski, Piotr; Cieszczyk, Paweł

    2015-11-22

    Atlanto-axial instability (AAI) is a developmental anomaly often occurring in persons with Down's syndrome (DS). According to various reports, AAI affects from 6.8 to 27% of the population with DS. The aim of this review was to illustrate the issue of AAI with regard to the progressively changing state of scientific knowledge. The extended distance between the rear surface of the frontal arcus of the C1 cervical vertebra and the anterior surface of C2 cervical vertebra dens (anterior atlanto-odontoid distance, AAOD) indicates the occurrence of AAI and is detectable through X-ray examination. Hypoplasia of the C2 dens, also detectable through X-ray examination, is another suggested risk factor for AAI. According to current data, the methodology of taking measurements is inconsistent, which leads to errors in interpretation. As research focusing on AAI was progressing, new data emerged from other studies on persons with DS, suggesting that neurological symptoms in persons with DS that indicated the occurrence of spinal cord compression were an important factor in medical imaging detection of AAI. One of the main arguments supporting this thesis is that in isolated cases spinal cord (SC) damage was noted during screening examinations conducted on a large population of subjects. Moreover, cases in which the neurological symptoms indicate spinal cord compression existed long before the occurrence of the actual damage also remain of significant importance. Therefore, it is necessary to promote neurological studies on persons with DS to enable early diagnosis of spinal cord compression and, at the same time, reduce the use of medical imaging in cases of neurological symptoms. PMID:26834869

  11. The relationship of occlusal disharmonies and symptoms of temporomandibular disorders

    Directory of Open Access Journals (Sweden)

    Dodić Slobodan

    2006-01-01

    Full Text Available Introduction: The influence of occlusal condition on the onset of temporomandibular disorder (TMD has been strongly debated for many years and is still the source of controversy. Until 1980s, the occlusal factors such as the presence of uncured malocclusions, discrepancies between intercuspal position (ICP and retruded contact position (RCP greater than two millimeters, occlusal abnormality, particularly mediotrusion and retrusion, and loss of posterior teeth were considered the primary causes of TMD. Objective: The objective of our study was to find correlation of occlusion disharmonies (difference between ICP and RCP and present sings and symptoms of TMD. Method: The study involved 60 subjects between 18 and 26 years of age who were divided in two groups. The study group consisted of 30 subjects between 18 and 26 years of age with sings and symptoms of temporomandibular disorders (TMD. TMD was confirmed according to Helkimo index. An average value of Helkimo index in this group was 1. The control group included 30 subjects between 20 and 25 years of age without TMD sings and symptoms. An average value of Helkimo index in this group was 0. The function analysis of cinematic centers position in RCP and ICP was performed in each subject using the computer pantograph Arcus-Digma (KaVo EWL GmbH, Leutkirch, Germany. Results: The results of our study showed that the translation tracing of cinematic points from RCP to ICP was significantly different in TMD subjects and asymptomatic group (p>0.16. In addition, the study revealed that 53.4 % of subjects with sings and symptoms of temporomandibular disorders had marked translation in the lower temporomandibular joint (0.61-1.2 mm what directed to intracapsular disorders. Conclusion: The results of our study suggested significant difference of RCP and ICP between subjects with sings and symptoms of the temporomandibular disorders and subjects without sings and symptoms.

  12. Carbon storage in Amazonian podzols

    Science.gov (United States)

    Montes, Celia; Lucas, Yves; Pereira, Osvaldo; Merdy, Patricia; Santin, Roberta; Ishida, Débora; du Gardin, Beryl; Melfi, Adolpho

    2014-05-01

    It has recently been discovered that Amazonian podzols may store much larger quantities of carbon than previously thought, particularly in their deep Bh horizons (over 13.6 Pg for Brazilian Amazonia alone [1]). Similarly high carbon stocks are likely to exist in similar climate/soil areas, mainly in Africa and in Borneo. Such carbon stocks raise the problem of their stability in response to changes in land use or climate. Any significant changes in vegetation cover would significantly alter the soil water dynamics, which is likely to affect organic matter turnover in soils. The direction of the change, however, is not clear and is likely to depend on the specific conditions of carbon storage and properties of the soils. It is reasonable to assume that the drying of the Bh horizons of equatorial podzols, which are generally saturated, will lead to an increase in C mineralization, although the extent of this increase has not yet been determined. These unknowns resulted in research programs, granted by the Brazilian FAPESP and the French Région PACA-ARCUS and ANR, dedicated improving estimates of the Amazonian podzol carbon stocks and to an estimate of its mineralisability. Eight test areas were determined from the analysis of remote sensing data in the larger Amazonian podzol region located in the High Rio Negro catchment and studied in detail. Despite the extreme difficulties in carrying out the field work (difficulties in reaching the study sites and extracting the soils), more than a hundred points were sampled. In all podzols the presence of a thick deep Bh was confirmed, sometimes to depths greater than 12 m. The Bh carbon was quantified, indicating that carbon stocks in these podzols are even higher than estimated recently [1]. References 1- Montes, C.R.; Lucas, Y.; Pereira, O.J.R.; Achard, R.; Grimaldi, M.; Mefli, A.J. Deep plant?derived carbon storage in Amazonian podzols. Biogeosciences, 8, 113?120, 2011.

  13. History of NAMES Conferences

    Science.gov (United States)

    Filippov, Lev

    2013-03-01

    -Russian International Centre was demonstrated. By the high standards of the reports presented, as well as by its overall organization, the second Seminar met the standards of an international conference. Reviews of state-of-the-art developments in materials science were given by leading scientists from Moscow and from the Lorraine region. The three days of the seminar were structured into four main themes: Functional Materials Coatings, Films and Surface Engineering Nanomaterials and Nanotechnologies The Environment and three Round Table discussions: Defining practical means of carrying out Franco-Russian collaborations in technology transfer and innovation Materials science ARCUS: Lorraine-Russian collaboration in materials science and the environment 32 oral and 25 poster presentations within four sections were given by a total of 110 participants. NAMES 2007, the 3rd Franco-Russian Seminar on New Achievements in Materials and Environmental Sciences, took place in Metz, France on 7-9 November 2007. The conference highlights fundamentals and development of the five main themes connected to the Lorraine-Russia ARCUS project with possible extension to other topics. The five main subjects included in the ARCUS project are: Bulk-surface-interface material sciences Nanomaterials and nanotechnologies Environment and natural resources Plasma physics—ITER project Vibrational dynamics The first, second and third NAMES conferences were financially supported by the following organizations: Ambassade de France à Moscou Communauté Urbaine du Grand Nancy Région Lorraine Conseil Général de Meurthe et Moselle Institut National Polytechnique de Lorraine Université de Metz Université Henry Poincaré CNRS ANVAR Federal Agency on Science and Innovations of the Ministry of Education and Science of the Russian Federation Moscow Committee on Science and Technologies Moscow Institute of Steel and Alloys (Technological University) The 4th conference is supported by the Ministry of Foreign Affairs of

  14. What effects has the cataract surgery on the development and progression of Age-Related Macular Degeneration (AMD?

    Directory of Open Access Journals (Sweden)

    Willich, Stefan N.

    2006-12-01

    Full Text Available Background: The cataract (Cataracta senilis is the most frequent eye disease of elderly people worldwide. In Germany, the cataract operation - with currently 450,000 interventions each year the most frequent operation in ophthalmology – can be seen as routine surgery. The age related macular degeneration (AMD is a further one of the most common, age-related eye diseases and the most frequent cause of blindness of elderly people in industrial nations. Due to demographic changes an increasing number of patients will suffer from cataract and AMD at the same time. This coincidence leads to a greater interest in the question of a mutual influence of both diseases, respectively their therapies, on each other. Objectives: The aim of this report was the evaluation of the medical and health economic effects of cataract operations on the development and progression of an age related macular degeneration (AMD. It was differentiated between first manifestations of AMD, progression of early stages of AMD and influence on further impairment in late stages of AMD. Methods: The relevant publications for this report were identified by DIMDI via structured database enquiry as well as common, self-made enquiry and were evaluated, based on the criteria of evidence based medicine. The present report included German and English literature published since 1983. Results: The database enquiry generated a record of 2769 issue-related publications. Eight medical publications were eligible for analysis in the course of the present HTA report. No relevant studies on health economical, ethical, social or legal issues could be included. Three epidemiological cohort studies provided some evidence for a promoting influence of cataract extractions on the progression of early types of AMD. Two of the epidemiological studies assessed the risk of first manifestation of AMD after cataract extraction. Both came up with up with increased incidences that did not reach statistical

  15. Artificial neural networks versus proportional hazards Cox models to predict 45-year all-cause mortality in the Italian Rural Areas of the Seven Countries Study

    Directory of Open Access Journals (Sweden)

    Puddu Paolo

    2012-07-01

    Full Text Available Abstract Background Projection pursuit regression, multilayer feed-forward networks, multivariate adaptive regression splines and trees (including survival trees have challenged classic multivariable models such as the multiple logistic function, the proportional hazards life table Cox model (Cox, the Poisson’s model, and the Weibull’s life table model to perform multivariable predictions. However, only artificial neural networks (NN have become popular in medical applications. Results We compared several Cox versus NN models in predicting 45-year all-cause mortality (45-ACM by 18 risk factors selected a priori: age; father life status; mother life status; family history of cardiovascular diseases; job-related physical activity; cigarette smoking; body mass index (linear and quadratic terms; arm circumference; mean blood pressure; heart rate; forced expiratory volume; serum cholesterol; corneal arcus; diagnoses of cardiovascular diseases, cancer and diabetes; minor ECG abnormalities at rest. Two Italian rural cohorts of the Seven Countries Study, made up of men aged 40 to 59 years, enrolled and first examined in 1960 in Italy. Cox models were estimated by: a forcing all factors; b a forward-; and c a backward-stepwise procedure. Observed cases of deaths and of survivors were computed in decile classes of estimated risk. Forced and stepwise NN were run and compared by C-statistics (ROC analysis with the Cox models. Out of 1591 men, 1447 died. Model global accuracies were extremely high by all methods (ROCs > 0.810 but there was no clear-cut superiority of any model to predict 45-ACM. The highest ROCs (> 0.838 were observed by NN. There were inter-model variations to select predictive covariates: whereas all models concurred to define the role of 10 covariates (mainly cardiovascular risk factors, family history, heart rate and minor ECG abnormalities were not contributors by Cox models but were so by forced NN. Forced expiratory volume and arm

  16. The application of undermining orbicularis oculi muscle from orbital rim for the correction of tear trough deformity and palabromalar groove in lower blepharoplasty%剥离弓状缘眼轮匝肌在伴有泪槽和睑颊沟的眼袋整复中的应用

    Institute of Scientific and Technical Information of China (English)

    郑亚荣; 刘凯; 李青峰; 李锋; 洪素庄

    2012-01-01

    Objective To evaluate the role of undermining orbicularis oculi muscle from Orbital rim for the correction of tear trough deformity and palabromalar groove in lower blepharoplasty.Methods 56 cases of lower eye baggy deformity with tear trough deformity and palabromalar groove were treated with the procedure of stripping eye orbicularis oculi muscle from orbital rim by a transcutaneous approach in lower blepharoplasty.The orbital septum was opened along the arcus marginalis for releasing the orbital fat.Some orbital fat was removed if necessary.Then the inferior edge of the orbital septum fat was reset over the orbital rim so as to smooth the infraorbital groove.Results 56 patients were available for 6 to 18 month' s follow-up.54 patients were quite satisfied with the cosmetic result.One developed lower eyelid retraction and another one showed asymmetrical subcutaneous local uneven after 1 month' s.They were all corrected by the second operation after 3 months.Conclusions Stripping orbicularis oculi muscle from orbital rim plays an important role for the correction of tear trough deformity and palabromalar groove in lower blepharoplasty.%目的 探讨伴有明显泪槽和睑颊沟的眼袋整形手术方法.方法 2007年1月至2011年6月,对56例眼袋伴泪槽和睑颊沟畸形者,在术中充分剥离松解弓状缘眼轮匝肌,尤其是附着在内侧泪槽处眶下缘骨膜面的眼轮匝肌,将眶隔脂肪释放重置并缝合固定于眶下缘下方4 ~6 mm处骨膜面上,进行泪槽和睑颊沟充填.结果 术后随访3 ~18个月,54例眼袋消失,无下睑凹陷、不平整等;1例术后1个月出现下睑皮下局部凹凸不平,3个月后经结膜入路修复后改善;1例出现下睑缘轻度退缩,经局部理疗后睑缘退缩消失.结论 剥离松解弓状缘眼轮匝肌,行眶隔重置,对矫正伴有泪槽及睑颊沟畸形的眼袋效果良好.

  17. Surgical anatomy and histology of the levator palpebrae superioris muscle for blepharoptosis correction

    Directory of Open Access Journals (Sweden)

    Đorđević Boban

    2013-01-01

    Full Text Available Background/Aim. The detailed knowledge of the architecture of the upper eyelid is very important in numerous upper eyelid corrective surgeries. The article deals with the detailed anatomy of the major components of the upper lid, which are commonly seen in surgical practice. Methods. This study was conducted on 19 human cadavers (12 adults and 7 infants without pathologic changes in the orbital region and eyelids. Anatomic microdissection of the contents of the orbita was performed bilaterally on 12 orbits from 6 unfixed cadavers (3 male and 3 female. Micromorphologic investigations of the orbital tissue were performed on 8 en bloc excised and formalin-fixed orbits of infant cadavers. Specimens were fixed according to the Duvernoy method. An intra-arterial injection of 5% mixture of melt formalin and black ink was administered into the carotid arterial system. Using routine fixation, decalcination, dehydration, illumination, impregnation and molding procedures in paraplast, specimens were prepared for cross-sections. Results. The measurement of the muscle length and diameter in situ in 6 nonfixed cadavers (12 orbits showed an average length of the levator palpbrae superioris (LPS muscle body of the 42.0 ± 1.41 mm on the right, and 40.3 ± 1.63 mm on the left side. In all the cases, the LPS had blood supply from 4 different arterial systems: the lacrimal, supratrochlear, and supraorbital artery and muscle branches of the ophthalmic artery. The LPS muscle in all the specimens was supplied by the superior medial branch of the oculomotor nerve. The connective tissue associated with the LPS muscle contains two transverse ligaments: the superior (Whitnall’s and intermuscular transverse ligaments (ITL. The orbital septum in all the specimens originated from the arcus marginalis of the frontal bone, and consisted of two layers - the superficial and the inner layer. In addition, a detailed histological analysis revealed that the upper eyelid

  18. The geology of Hotei Regio, Titan: Correlation of Cassini VIMS and RADAR

    Science.gov (United States)

    Soderblom, L.A.; Brown, R.H.; Soderblom, J.M.; Barnes, J.W.; Kirk, R.L.; Sotin, C.; Jaumann, R.; MacKinnon, D.J.; Mackowski, D.W.; Baines, K.H.; Buratti, B.J.; Clark, R.N.; Nicholson, P.D.

    2009-01-01

    evidence a complex set of geological processes (pluvial, fluvial, tectonic, cryovolcanic, impact) that have likely remained active up to very recent geological time (<104 year). That the cryovolcanic flows are excessively bright in the infrared, particularly at 5 ??m, might signal ongoing geological activity. One study [Nelson, R.M., and 28 colleagues, 2009. Icarus 199, 429-441] reported significant 2-??m albedo changes in VIMS data for Hotei Arcus acquired between 2004 and 2006, that were interpreted as evidence for such activity. However in our review of that work, we do not agree that such evidence has yet been found.

  19. Correction of lower eyelids tear trough deformity via multiple techniques used synthetically in lower blepharoplasty%多技术综合应用下睑成形术矫正下睑泪槽畸形

    Institute of Scientific and Technical Information of China (English)

    刘志坤; 蒋晟; 杨锋; 蒋斌; 肖霞; 惠品香

    2013-01-01

    Objective To investigate the feasibility of correction of lower eyelids tear trough deformity via multiple techniques used synthetically in lower blepharoplasty, and to summarize operation skills and experience. Methods Through skin incision muscle -skin flap operation approach,arcus marginalis orbital septum fat release,orbital fat preservation, orbital septum tighten and reset, fascia ligament of orbicularis lifting suspension combined operation method. Results In 56 patients.no obvious bleeding, petechiae in postoperative,without eyelid ball separation, ectropion complications. Follow up of 2 months to 30 months,lower eyelid skin was smooth, the tear trough deformity was significantly improved, patients perceived appearance satisfaction. Conclusion Correction of lower eyelids tear trough deformity via multiple techniques used synthetically in lower blepharoplasty, was a effective operation method to obtain the mid-face rejuvenation.%目的:探讨多项技术综合应用下睑成形术矫正下睑泪槽畸形的可行性,总结手术操作技巧及经验.方法:经皮肤肌皮瓣手术入路,采用弓状缘眶隔脂肪释放、眶内脂肪保留、眶隔紧缩重置技术及眶肌筋膜韧带提紧悬吊相结合的综合手术方法. 结果:本组56例患者,术后无明显出血、瘀斑,无睑球分离、下睑外翻等并发症出现.随访2~30个月,下睑部皮肤平整,泪槽畸形明显改善,患者自感外观效果满意.结论:多项技术综合应用下睑成形术矫正下睑泪槽畸形是获得面中部年轻化的行之有效的手术方法.

  20. PolarTREC: Successful Methods and Tools for Attaining Broad Educational Impacts with Interdisciplinary Polar Science

    Science.gov (United States)

    Timm, K. M.; Warburton, J.; Owens, R.; Warnick, W. K.

    2008-12-01

    PolarTREC--Teachers and Researchers Exploring and Collaborating, a program of the Arctic Research Consortium of the U.S. (ARCUS), is a National Science Foundation (NSF)-funded International Polar Year (IPY) project in which K-12 educators participate in hands-on field experiences in the polar regions, working closely with IPY scientists as a pathway to improving science education. Developing long-term teacher- researcher collaborations through PolarTREC ensures up-to-date climate change science content will permeate the K-12 education system long after the IPY. By infusing education with the cutting edge science from the polar regions, PolarTREC has already shown an increase in student and public knowledge of and interest in the polar regions and global climate change. Preliminary evaluations have shown that PolarTREC's program activities have many positive impacts on educators and their ability to teach science concepts and improve their teaching methods. Additionally, K-12 students polled in interest surveys showed significant changes regarding the importance of understanding the polar regions as a person in today's world. Researchers have been overwhelmingly satisfied with PolarTREC and cited several specific strengths, including the program's crucial link between the teachers' field research experiences and their classroom and the extensive training provided to teachers prior to their expedition. This presentation will focus on other successful components of the PolarTREC program and how researchers and organizations might use these tools to reach out to the public for long-term impacts. Best practices include strategies for working with educators and the development of an internet-based platform for teachers and researchers to interact with the public, combining several communication tools such as online journals and forums, real-time Internet seminars, lesson plans, activities, audio, and other educational resources that address a broad range of scientific

  1. Antarctica Day: An International Celebration

    Science.gov (United States)

    Pope, A.; Hambrook Berkman, J.; Berkman, P. A.

    2013-12-01

    For more than half a century, the 1959 Antarctic Treaty continues to shine as a rare beacon of international cooperation. To celebrate this milestone of peace in our civilization with hope and inspiration for future generations, Antarctica Day is celebrated each year on December 1st , the anniversary of the Antarctic Treaty signing. As an annual event - initiated by the Foundation for the Good Governance of International Spaces (www.internationalspaces.org/) in collaboration with the Association of Polar Early Carer Scientists (www.apecs.is) - Antarctica Day encourages participation from around the world. The Antarctic Treaty set aside 10% of the earth, 'forever to be used exclusively for peaceful purposes in the interest of mankind.' It was the first nuclear arms agreement and the first institution to govern all human activities in an international region beyond sovereign jurisdictions. In this spirit, Antarctica Day aims to: - Demonstrate how diverse nations can work together peacefully, using science as a global language of cooperation for decision making beyond national boundaries, - Provide strategies for students learning about Antarctica through art, science and history at all school levels, - Increase collaboration and communication between classrooms, communities, researchers and government officials around the world, and - Provide a focus for polar educators to build on each year. Through close collaboration with a number of partners. Antarctica Day activities have included: a Polar Film Festival convened by The Explorers Club; live sessions connecting classrooms with scientists in Antarctica thanks to PolarTREC and ARCUS; an international activity that involved children from 13 countries who created over 600 flags which exemplify Antarctica Day (these were actually flown in Antarctica with signed certificates then returned to the classes); a map where Antarctica Day participants all over the world could share what they were doing; an Antarctic bird count

  2. Improving Geoscience Education through the PolarTREC Teacher Research Experience Model (Invited)

    Science.gov (United States)

    Warburton, J.; Timm, K.; Larson, A. M.

    2010-12-01

    Teacher Research Experiences (TRE’s) are not new. For more than a decade, the National Science Foundation (NSF) as well as other federal agencies have been funding programs that place teachers with researchers in efforts to invigorate science education by bringing educators and researchers together through hands-on experiences. Many of the TRE’s are successful in providing a hands-on field experience for the teachers and researchers however many of the programs lack the resources to continue the collaborations and support the growing network of teachers that have had these field experiences. In 2007, NSF provided funding for PolarTREC—Teachers and Researchers Exploring and Collaborating, a program of the Arctic Research Consortium of the U.S. (ARCUS). PolarTREC is a TRE where K-12 teachers participate in polar field research, working closely with scientists as a pathway to improving science education. In just three years, it has become a successful TRE. What makes PolarTREC different than other the teacher research experience programs and how can others benefit from what we have learned? During this presentation, we will share data collected through the program evaluation and on how PolarTREC contributes to the discipline of Science, Technology, Engineering, and Mathematics (STEM) education and pedagogy through a model program conceived and organized according to current best practices, such as pre-research training, mentoring, support for classroom transfer, and long-term access to resources and support. Data shows that PolarTREC’s comprehensive program activities have many positive impacts on educators and their ability to teach science concepts and improve their teaching methods. Additionally, K-12 students polled in interest surveys showed significant changes in key areas including amount of time spent in school exploring research activities, importance of understanding science for future work, importance of understanding the polar regions as a person

  3. SEARCH: Study of Environmental Arctic Change--A System-scale, Cross-disciplinary Arctic Research Program

    Science.gov (United States)

    Shnoro, R. S.; Eicken, H.; Francis, J. A.; Scambos, T. A.; Schuur, E. A.; Straneo, F.; Wiggins, H. V.

    2013-12-01

    will create a network of scientists and stakeholders to generate, assess and communicate Arctic seasonal sea ice forecasts. - Collaboration with the Interagency Arctic Research Policy Committee (IARPC) to implement mutual science goals. SEARCH is sponsored by 8 U.S. agencies, including: the National Science Foundation, the National Oceanic and Atmospheric Administration, the National Aeronautics and Space Administration, the Department of Defense, the Department of Energy, the Department of the Interior, the Smithsonian Institution, and the U.S. Department of Agriculture. The U.S. Arctic Research Commission participates as an observer. For more information: http://www.arcus.org/search.

  4. PolarTREC-Celebrating the Legacy of the IPY Through Researcher-Educator Partnerships

    Science.gov (United States)

    Timm, K.; Warburton, J.; Larson, A. M.

    2009-12-01

    the other hand, gained life-changing professional development and a network of science content experts who can help them in curriculum development. The IPY emphasized improved scientific understanding through innovative approaches to education and outreach programming. In initial PolarTREC evaluation data, participating teachers reported extensive increases in their knowledge of the Polar Regions, their use of effective science instruction methods, and their ability to teach the science concepts pertinent to their research experience. Students reported an increased understanding of general physical science concepts, topics related to the polar regions, and the importance of science for their future work and as a citizen in today’s world. Through participation in the IPY, PolarTREC provides a tested approach to TRE's that can be applied in the future to other contexts and locations. For more information, contact ARCUS at: info@polartrec.com or 907-474-1600.

  5. Is diatom richness responding to catchment glaciation? A case study from Cana+9dian headwater streams

    Directory of Open Access Journals (Sweden)

    Eugen Rott

    2012-01-01

    Full Text Available Due to global change affecting glaciers worldwide, glacial streams are seen as threatened environments deserving specific scientific interest. Glacial streams from the Coast Range and Rocky Mountains in British Columbia and at the border to Alberta were investigated. In particular glacial streams and downstream sites in the Joffré Lakes Provincial Park, a near by mountain river and two large glacial streams in the Rocky Mountains (Kootenay Range, Jasper National Park were studied. Regardless of a high variability of catchment glaciation (1 to 99% thin organic biofilms with firmly attached diatom frustules of the genera Achnanthidium, Psammothidium, Encyonema, Gomphonema and fragilaroid taxa were found in all cases. In spite of fundamentally different geological conditions between the Coast Range sites and the Rocky Mountain sites, the pioneer taxon Achnanthidium minutissimum (with a slimy long ecomorph was dominating quantitatively in most of the glacier stream samples together with the rheobiontic Hannaea arcus. Individual glacier stream samples were characterized by the dominance of Achnanthidium petersenii and Gomphonema calcifugum/Encyonema latens. The diatom community analysis (cluster analysis revealed the expected separation of glacier stream sites and sites of the lower segments of the river continuum (e.g., dominance of Diatoma ehrenbergii in the mountain river. In the Joffré area, the total species richness of turbid glacial streams close to the glacier mouth was significantly lower than in the more distant sites. The two largest glacial streams in the Rocky Mountains showed divergent results with a remarkable high species richness (43 taxa at the Athabasca River origin (Columbia Icefield and low diversity in Illecillewaet river (9 km downstream the glacier mouth. From the biogeographical point of view the dominant taxa comprised mainly widespread pioneer species coping best with the unstable conditions, while the subdominant taxa

  6. Sustaining the Bering Ecosystem: A Social Science Research Plan

    Science.gov (United States)

    Fitzhugh, B.; Huntington, H. P.; Pete, M. C.; Sepez, J. A.

    2007-12-01

    The Bering Sea is changing from an ice-dominated to an increasingly open water system. The over-arching goal of the NSF-supported Bering Ecosystem Study (BEST) is to understand the effects of climate variability and change on the Bering Sea ecosystem. To the people who are simultaneously a part of that ecosystem and rely on its productivity for life and work, climate change and its effects are among the top concerns. Sustaining the Bering Ecosystem articulates a vision and approaches for social science research as a component of the BEST Program (www.arcus.org/bering). This science plan seeks to initiate research to elucidate the dynamic relationship between the Bering Sea ecosystem and the humans who constitute an integral component of that system. To do so, this plan delineates a research program focused on three broad themes: 1. Impacts on humans: how past, current, and possible future changes in the Bering Sea ecosystem affect the health and well-being of people living and depending on this region for subsistence, employment, and cultural survival. 2. Human impacts: how changing human uses of the Bering Sea region affect the natural cycles of this ecosystem by moderating and/or accelerating systemic changes. 3. Dynamics of human and non-human natural systems: how the human-environmental dynamic has changed through time and may change in the future due to internal and external opportunities and pressures. These themes are developed in the context of a community-driven approach based on the concerns, goals, and interests of Bering Sea residents and other stakeholders of the region. This plan has been drafted through the collaboration of Bering Sea residents (primarily Alaska Natives) and non-resident stakeholders, social scientists, and natural scientists to focus efforts around research questions important to stakeholders, which in various ways center on issues of sustainability (of resources, economic opportunities, ways of life, and culture itself). The

  7. The Arctic Grand Challenge: Abrupt Climate Change

    Science.gov (United States)

    Wilkniss, P. E.

    2003-12-01

    Trouble in polar paradise (Science, 08/30/02), significant changes in the Arctic environment are scientifically documented (R.E. Moritz et al. ibid.). More trouble, lots more, "abrupt climate change," (R. B. Alley, et al. Science 03/28/03). R. Corell, Arctic Climate Impact Assessment team (ACIA), "If you want to see what will happen in the rest of the world 25 years from now just look what's happening in the Arctic," (Arctic Council meeting, Iceland, 08/03). What to do? Make abrupt Arctic climate change a grand challenge for the IPY-4 and beyond! Scientifically:Describe the "state" of the Arctic climate system as succinctly as possible and accept it as the point of departure.Develop a hypothesis and criteria what constitutes "abrupt climate change," in the Arctic that can be tested with observations. Observations: Bring to bear existing observations and coordinate new investments in observations through an IPY-4 scientific management committee. Make the new Barrow, Alaska, Global Climate Change Research Facility a major U.S. contribution and focal point for the IPY-4 in the U.S Arctic. Arctic populations, Native peoples: The people of the North are living already, daily, with wrenching change, encroaching on their habitats and cultures. For them "the earth is faster now," (I. Krupnik and D. Jolly, ARCUS, 2002). From a political, economic, social and entirely realistic perspective, an Arctic grand challenge without the total integration of the Native peoples in this effort cannot succeed. Therefore: Communications must be established, and the respective Native entities must be approached with the determination to create well founded, well functioning, enduring partnerships. In the U.S. Arctic, Barrow with its long history of involvement and active support of science and with the new global climate change research facility should be the focal point of choice Private industry: Resource extraction in the Arctic followed by oil and gas consumption, return the combustion

  8. Connections in the Field and Beyond: A Case Study of Successful Teacher Research Experiences at the Poles

    Science.gov (United States)

    Rosenberger, D.

    2007-12-01

    Successful and lasting partnerships between scientists and teachers can be established through Teacher Research Experiences (TRE). The documented benefits of the TRE include increased teacher retention in addition to renewed instructional practices in veteran teachers. The reality and excitement of field science is very difficult to convey to students if the teacher has never personally experienced it, and a TRE can transfer this interest into the classroom. With the field research experience as the centerpiece of the TRE relationship, much should be done before, during, and after the TRE to ensure a positive and lasting connection that meets the needs of both the teacher and researcher. This presentation focuses, from a teacher's first-hand perspective, on the critical issues that scientists must consider to ensure successful collaborations with teachers in the field. I have participated in two TRE's and have learned a great deal from both. In 2001, through the National Science Foundation sponsored program Teachers Experiencing Antarctica and the Arctic (TEA) I was able to participate in biochemical oceanographic science on-board the Icebreaker Oden in the Arctic Ocean. In 2005, I did biogeochemical research at Pony Lake/McMurdo Station in Antarctica as a participant in Teachers and Researchers Exploring and Collaborating (TREC), a program of the Arctic Research Consortium of the United States (ARCUS). On both research experiences, I was a working member of the science team. I was responsible for numerous teaching and outreach activities including: uploading daily journals and photos to a website, answering email from students and the public, and managing live communications with schools. Both research experiences were very successful and have resulted in lasting relationships with scientists and other teachers interested in polar science. My participation in these experiences also influenced my teaching by increasing student enthusiasm in the classroom and

  9. Live from the Arctic

    Science.gov (United States)

    Warnick, W. K.; Haines-Stiles, G.; Warburton, J.; Sunwood, K.

    2003-12-01

    For reasons of geography and geophysics, the poles of our planet, the Arctic and Antarctica, are places where climate change appears first: they are global canaries in the mine shaft. But while Antarctica (its penguins and ozone hole, for example) has been relatively well-documented in recent books, TV programs and journalism, the far North has received somewhat less attention. This project builds on and advances what has been done to date to share the people, places, and stories of the North with all Americans through multiple media, over several years. In a collaborative project between the Arctic Research Consortium of the United States (ARCUS) and PASSPORT TO KNOWLEDGE, Live from the Arctic will bring the Arctic environment to the public through a series of primetime broadcasts, live and taped programming, interactive virtual field trips, and webcasts. The five-year project will culminate during the 2007-2008 International Polar Year (IPY). Live from the Arctic will: A. Promote global understanding about the value and world -wide significance of the Arctic, B. Bring cutting-edge research to both non-formal and formal education communities, C. Provide opportunities for collaboration between arctic scientists, arctic communities, and the general public. Content will focus on the following four themes. 1. Pan-Arctic Changes and Impacts on Land (i.e. snow cover; permafrost; glaciers; hydrology; species composition, distribution, and abundance; subsistence harvesting) 2. Pan-Arctic Changes and Impacts in the Sea (i.e. salinity, temperature, currents, nutrients, sea ice, marine ecosystems (including people, marine mammals and fisheries) 3. Pan-Arctic Changes and Impacts in the Atmosphere (i.e. precipitation and evaporation; effects on humans and their communities) 4. Global Perspectives (i.e. effects on humans and communities, impacts to rest of the world) In The Earth is Faster Now, a recent collection of comments by members of indigenous arctic peoples, arctic

  10. High-resolution diatom analyses of holocene deposits from lake baikal: preliminary results for the records from continent ridge, posolsky bank and vydrino shoulder

    Science.gov (United States)

    Rioual, P.; Morley, D.; Mackay, A. W.

    2003-04-01

    Most studies on the sedimentary diatom assemblages of Lake Baikal have either focused on the very recent past or have been carried out at low sampling resolution on sequences that encompass several glacial/interglacial cycles. Here we present the progress made so far on the high-resolution diatoms analysis of the Holocene records found in three sites, one located in the North basin (Continent Ridge), and two located in the South basin (Posolsky Bank and Vydrino Shoulder). Samples are being analysed at a 5 mm resolution throughout the Holocene record for Vydrino Shoulder and every 1 cm for Posolsky Bank. At Continent Ridge, diatom analysis was carried out every 2 mm on the uppermost 20 cm of the core, while samples for the rest of the Holocene record were analysed every 1 cm only. We expect these to reflect a decadal to centennial resolution. From these three sequences, a very large number of diatom taxa (about 500) have been identified. In all three sequences, endemic planktonic diatoms dominate the assemblages. Species shifts common to all three sequences can be identified such as the rising percentages of Aulacoseira baicalensis and A. skvortzowii (species blooming under the ice in Spring) and the relative decline of Cyclotella minuta (that blooms during the Autumn overturn) at the top of the sequences, perhaps associated with the end of the Little Ice Age. Further down core, a peak of Stephanodiscus parvus, the rise in percentages of Cyclostephanos dubius and the decline of the endemic Stephanodiscus flabellatus also represent distinct species shifts. The cosmopolitan S. parvus and C. dubius are thought to indicate higher nutrient status. These features appear to be lake-wide and can maybe be used to correlate the sequences. Differences in species succession, however, are also apparent between the three records. Large peaks of Hannaea arcus, a periphytic diatom, and Asterionella formosa, a cosmopolitan planktonic species, for example are only found at Vydrino

  11. Blefaroplastia inferior: poderia a cirurgia proporcionar satisfação aos pacientes? Lower blepharoplasty: would the surgery provide satisfaction to the patient?

    Directory of Open Access Journals (Sweden)

    Giovanni André Pires Viana

    2012-12-01

    was composed of 25 patients who were submitted to conservatively standard fat-resection lower eyelid blepharoplasty, and routine lateral canthal support. The Surgical Group 2 (experimental group was represented by 25 patients submitted to lower eyelid blepharoplasty with periorbital fat mobilization and arcus marginalis redrape, and routine lateral canthal support. The self-esteem of all patients was compared with those in 25 age-matched volunteers from the general population. The parameters of the Rosenberg Self-Esteem Scale were determined preoperatively and at 6-month interval postoperatively. Standardized photographs obtained before and after surgery were evaluated by three independent observers. RESULTS: The median follow-up was 395 days (range 364 to 547 days. The mean age was 48.8 years, the population's gender was predominantly female (96%. Analysis of preoperative and postoperative photographs showed that 96% patients achieved significant improvement. Self-esteem scores improved from baseline preoperative mean levels of 5.1 (Standard Deviation = 4.1 to a mean level of 3.6 (Standard Deviation = 3.5 at 6 months post-surgery (p=0.001. No patients had orbital hematoma, blepharitis, lagophthalmos or ectropion. CONCLUSIONS: The authors concluded that both procedures are safe and effective with low complication rates, and marked improvement in self-esteem was observed in patients at 6-month follow-up.

  12. Three-Dimensional Views of Titan

    Science.gov (United States)

    Kirk, R. L.; Howington-Kraus, E.; Redding, B. L.; Becker, T. L.; Lee, E. M.; Stiles, B. W.; Hensley, S.; Cassini RADAR Team

    2009-04-01

    processes. T41-T43 This pair covers part of Hotei Arcus, an infrared-bright and possibly time-variable feature that has been hypothesized to be cryovolcanic, based on the presence of lobate flow-like features in the RADAR images. Our DTM shows that these flows are 100-200 m thick (which should lead to constraints on their rheology and composition), with radar-bright tops and dark margins. Narrow, bright channels nearby are incised into the mountains and display little elevation change, consistent with a less viscous fluid such as pluvial/fluvial liquid methane. T13-T43 This pair covers part of the "middle rugged terrain" in the north central part of the continent-sized bright region Xanadu. The DTM does not resolve the many small (<10 km wide) mountains in the region, but clearly shows the largest peaks and chains to be elevated by hundreds of meters. The model also indicates a regional slope to the southwest, consistent with the apparent flow direction of numerous fluvial channels in western Xanadu.