WorldWideScience

Sample records for amphipoda stages 1-4

  1. Changes in ventilation and locomotion of Gammarus pulex (Crustacea, Amphipoda) in response to low concentrations of pharmaceuticals

    NARCIS (Netherlands)

    Lange, de H.J.; Peeters, E.T.H.M.; Lürling, M.F.L.L.W.

    2009-01-01

    Exposure to contaminants below lethal concentrations may affect the performance of organisms, resulting in measurable differences in behavior. We measured the response of the benthic invertebrate Gammarus pulex (Crustacea, Amphipoda) to sublethal concentrations of three pharmaceuticals, fluoxetine,

  2. Marine interstitial Amphipoda and Isopoda (Crustacea) from Santiago, Cape Verde Islands

    NARCIS (Netherlands)

    Stock, Jan H.; Vonk, Ronald

    1992-01-01

    Three species of Amphipoda are recorded from interstices of a marine beach on the island of Santiago, Cape Verde Archipelago: Cabogidiella littoralis n. gen., n. sp. (Bogidiellidae), Psammogammarus spinosus n. sp. (Melitidae), and Idunella sketi Karaman, 1980 (Liljeborgiidae). The latter, widely dis

  3. Simple ps microchip Nd:YVO4 laser with 3.3 ps pulses at 0.2 - 1.4 MHz and single-stage amplification to the microjoule level

    Science.gov (United States)

    Türkyilmaz, Erdal; Lohbreier, Jan; Günther, Christian; Mehner, Eva; Kopf, Daniel; Giessen, Harald; Braun, Bernd

    2016-03-01

    Commercial picosecond sources have found widespread applications. Typical system parameters are pulse widths below 20 ps, repetition rates between 0.1 to 2 MHz, and micro Joule level pulse energies. Most systems are based on short pulse modelocked oscillators, regenerative amplifiers, and pockel cells as active beam switches. In contrast we present a completely passive system, consisting of a passively Q-switched microchip laser, a single-stage amplifier, and a pulse compressor. The Q-switched microchip laser has a 50 μm long Nd:YVO4-gain material optically bonded to a 4.6 mm thick undoped YVO4-crystal. It delivers pulse widths of 40 ps and repetition rates of 0.2 - 1.4 MHz at a wavelength of 1.064 μm. The pulse energy is a few nJ. These 40-ps pulses are spectrally broadened in a standard single mode fibre and then compressed in a 24 mm long chirped Bragg grating to as low as 3.3 ps. The repetition rate can be tuned from app. 0.2 to 1.4 MHz by changing the pump power while the pulse width and the pulse energy from the microchip laser are unchanged. The spectral broadening in the fibre is observed throughout the pulse repetition rate, supporting sub-10- ps pulses. Finally, the pulses are amplified in a single-stage Nd:YVO4-amplifier up to the microjoule level (up to 4 μJ pulse energy). As a result the system delivers sub-10-ps pulses at a microjoule level with about 1 MHz repetition rate, and thus fulfills the requirements for ps-micromachining. It does not contain any active switching elements and can be integrated in a very compact setup.

  4. Simple ps microchip Nd:YVO4 laser with 3.3-ps pulses at 0.2 to 1.4 MHz and single-stage amplification to the microjoule level

    Science.gov (United States)

    Türkyilmaz, Erdal; Lohbreier, Jan; Günther, Christian; Mehner, Eva; Kopf, Daniel; Giessen, Harald; Braun, Bernd

    2016-06-01

    Commercial picosecond sources have found widespread applications. Typical system parameters are pulse widths below 20 ps, repetition rates between 0.1 and 2 MHz, and microjoule level pulse energies. Most systems are based on short pulse mode-locked oscillators, regenerative amplifiers, and pockel cells as active beam switches. In contrast, we present a completely passive system, consisting of a passively Q-switched microchip laser, a single-stage amplifier, and a pulse compressor. The Q-switched microchip laser has a 50-μm-long Nd:YVO4 gain material optically bonded to a 4.6-mm-thick undoped YVO4 crystal. It delivers pulse widths of 40 ps and repetition rates of 0.2 to 1.4 MHz at a wavelength of 1.064 μm. The pulse energy is a few nanojoule. These 40-ps pulses are spectrally broadened in a standard single-mode fiber and then compressed in a 24-mm-long chirped Bragg grating to as low as 3.3 ps. The repetition rate can be tuned from ˜0.2 to 1.4 MHz by changing the pump power, while the pulse width and the pulse energy from the microchip laser are unchanged. The spectral broadening in the fiber is observed throughout the pulse repetition rate, supporting sub-10-ps pulses. Finally, the pulses are amplified in a single-stage Nd:YVO4 amplifier up to the microjoule level (up to 4 μJ pulse energy). As a result, the system delivers sub-10-ps pulses at a microjoule level with about 1 MHz repetition rate, and thus fulfills the requirements for ps-micromachining. It does not contain any active switching elements and can be integrated in a very compact setup.

  5. The first hypothelminorheic Crustacea (Amphipoda, Dogielinotidae, Hyalella from South America

    Directory of Open Access Journals (Sweden)

    Stella Rodrigues

    2012-11-01

    Full Text Available Most of known troglobiotic species occur in caves and subterranean environments from great depths. However, recently more attention has been given to other subterranean environments, such as the hypothelminorheic habitats. It comprises the most superficial among all subterranean habitats. This kind of environment is characterized by the constant presence of wet spots, absence of light and very particular abiotic characteristics, comprising unique species. The first hypothelminorheic Amphipoda from South America is here described, a new species of the genus Hyalella which occurs in a wetland on Southern Brazil. The new species differs from other troglobiotics of the genus by the presence of a curved seta on the inner ramus of uropod 1 and elongation of appendices, as the first pair of antennae and peraeopods 6 and 7. However, human impacts in the area where the new species occurs have changed heavily their habitat, which may have led the species to a critical level of threat or even extinction, demonstrating the fragility of this environment.a

  6. Identification of the first neuropeptides from the Amphipoda (Arthropoda, Crustacea).

    Science.gov (United States)

    Christie, Andrew E

    2014-09-15

    Despite being used as models in the field of ecotoxicology, including use in studies of endocrine disruption, little is known about the hormonal systems of amphipods, particularly their peptidergic signaling systems. Here, transcriptome shotgun assembly (TSA) sequences were used to predict the structures of the first neuropeptides from members of this crustacean order. Using a well-established workflow, BLAST searches of the extant amphipod TSA data were conducted for putative peptide-encoding transcripts. The pre/preprohormones deduced from the identified TSA sequences were then used to predict the mature structures of amphipod neuropeptides. In total, 43 putative peptide-encoding transcripts were identified from three amphipods, Echinogammarus veneris, Hyalella azteca and Melita plumulosa. Collectively, 139 distinct mature peptides (110 from E. veneris alone) were predicted from these TSA sequences. The identified peptides included members of the adipokinetic hormone/red pigment concentrating hormone, allatostatin A, allatostatin B, allatostatin C, bursicon α, bursicon β, crustacean hyperglycemic hormone, diuretic hormone 31, FLRFamide, molt-inhibiting hormone, myosuppressin, neuroparsin, neuropeptide F, orcokinin, pigment dispersing hormone (PDH), proctolin, RYamide, SIFamide, sulfakinin and tachykinin-related peptide families. Of particular note were the identifications of orcokinins possessing SFDEIDR- rather than the typical NFDEIDR- amino-termini, e.g. SFDEINRSNFGFN, a carboxyl-terminally amidated orcokinin, i.e. SFDEINRSNFGFSamide, PDHs longer than the stereotypical 18 amino acids, e.g. NSELLNTLLGSKSLAALRAAamide, and a 13 rather than 12 amino acid long SIFamide, i.e. GPYRKPPFNGSIFamide. These data not only provide the first descriptions of native amphipod neuropeptides, but also represent a new resource for initiating investigations of peptidergic signaling in the Amphipoda.

  7. Regional diversity of amphipoda in the Caribbean Sea.

    Science.gov (United States)

    Martín, Alberto; Díaz, Yusbelly; Miloslavich, Patricia; Escobar-Briones, Elva; Guerra-García, José Manuel; Ortiz, Manuel; Valencia, Bellineth; Giraldo, Alan; Klein, Eduardo

    2013-12-01

    The order Amphipoda is one of the most diverse within Peracarids, and comprises 6950 described marine species. Amphipod research in the Caribbean Sea began in the late 1800s, but has increased significantly since 1980. In this study, we analized the amphipod biodiversity (Caprellidea, Gammaridea, Hyperiidea, and Ingolfiellidea) of the Caribbean Sea. For this, we compiled available data on species diversity of marine amphipods (data bases: WoRMS and OBIS and published species lists) into a comprehensive taxonomic list by country for the ecoregions of the Caribbean. Additionally, we analized the relative contribution of each country to regional diversity and the rate of discovery of new species. The Caribbean amphipod fauna is composed of 535 species within 236 genera and 73 families for the higher taxon. The Western Caribbean ecoregion holds the largest diversity (282 species), while the Eastern Caribbean recorded the lowest one (73). Mexico and Venezuela recorded the largest number of species with 266 and 206, respectively. Twelve countries had less than 50 species. The richest suborder is the Gammaridea with 381 species followed by the suborder Hyperiidea with 116. From the total of 535 amphipod species reported for the Caribbean region, 218 have the Caribbean as the holotype locality, and 132 are endemic (about 25% of the total). Areas of higher diversity seem to be concentrated along the Mexican Caribbean, Cuba and the Northern coast of South America (Venezuela-Colombia); however, such pattern is most likely reflecting local collection efforts and taxonomic expertise rather than actual distribution. Knowledge of amphipod species is mostly limited to shallow, near-shore waters, with little infonnation available on the deep sea fauna. Regional research priorities for this group should be focused on completing shallow water coastal inventories of species in Central America and the Greater and Lesser Antilles. In addition, sampling the deep sea ecosystems should

  8. The amphipoda collected during the voyages of the Willem Barents in the Arctic Seas in the years 1880—1884

    NARCIS (Netherlands)

    Stebbing, Thomas R.R.

    1893-01-01

    The arctic amphipoda collected by the Willem Barents’ expeditions of 1878 and 1879 were described by Dr. P. P. C. Hoek. The same eminent carcinologist had already carried out the preliminary sorting of the present collection, when, upon appointment to his important post at Helder, he found that the

  9. Amsterdam Expeditions to the West Indian Islands, Report 14. The taxonomy and zoogeography of the family Bogidiellidae (Crustacea, Amphipoda), with emphasis on the West Indian taxa

    NARCIS (Netherlands)

    Stock, Jan H.

    1981-01-01

    The diagnosis of a family of groundwater Amphipoda, the Bogidiellidae, is revised. Based on a cladistic analysis, the former genus Bogidiella is subdivided. In its present conception, the Bogidiellidae comprise eleven named genera, seven subgenera, and 50 named species, whereas several other taxa re

  10. A new species of Elasmopus (Amphipoda: Hadzioidea: Maeridae from Suape Harbor, Northeastern Brazilian coast

    Directory of Open Access Journals (Sweden)

    André R. Senna

    2011-09-01

    Full Text Available A new amphipod species of the genus Elasmopus Costa, 1853 is described based on material collected from intertidal rocky shore, near the Suape Harbor, coast of the Brazilian state of Pernambuco. The new species may be recognized by the propodus of gnathopod 2 suboval, slightly tapering distally, palmar margin not defined by a stout seta, spine, or palmar corner, with a subdistal blunt tubercle, posterior margin covered by a dense fringe of plumose setae, and posterior margin of basis of pereopod 7 castelloserrate. This is the ninety-fifth species of the genus Elasmopus described worldwide, the most diverse genus in the family Maeridae Krapp-Schickel, 2008, and the eighth species recorded from Brazilian waters. An identification key to Brazilian species of Elasmopusis also provided.Uma nova espécie Amphipoda do gênero Elasmopus Costa, 1853 é descrita com base em material coletado da zona entre marés de um costão rochoso, próximo ao Porto de Suape, costado estado brasileiro de Pernambuco. A nova espécie pode ser reconhecida pelo própodo do gnatópo de 2 suboval, estreitando-se de forma suave distalmente, margem palmar não definida por uma cerda grossa, espinho, ou ângulo palmar, comum tubérculo subdistal não agudo, margem posterior coberta por uma franja densa de cerdas plumosas, e margem posterior da base do pereópodo 7 castelosserrado. Esta é a nonagésima quinta espécie do gênero Elasmopus descrita ao redor do mundo, o mais diverso gênero na família Maeridae Krapp-Schickel, 2008, e a oitava espécie registrada para as águas brasileiras. É fornecida também uma chave de identificação para as espécies brasileiras de Elasmopus.

  11. 45 CFR 1206.1-4 - Suspension.

    Science.gov (United States)

    2010-10-01

    ... 45 Public Welfare 4 2010-10-01 2010-10-01 false Suspension. 1206.1-4 Section 1206.1-4 Public... GRANTS AND CONTRACTS-SUSPENSION AND TERMINATION AND DENIAL OF APPLICATION FOR REFUNDING Suspension and Termination of Assistance § 1206.1-4 Suspension. (a) General. The responsible Corporation official may...

  12. 49 CFR 1.4 - General responsibilities.

    Science.gov (United States)

    2010-10-01

    ... information databases. (5) Providing leadership on technical, navigation, communication, and systems... § 1.4 General responsibilities. (a) Office of the Secretary. Provides for: (1) Leadership...

  13. 24 CFR 1.4 - Discrimination prohibited.

    Science.gov (United States)

    2010-04-01

    ... 24 Housing and Urban Development 1 2010-04-01 2010-04-01 false Discrimination prohibited. 1.4... DEVELOPMENT-EFFECTUATION OF TITLE VI OF THE CIVIL RIGHTS ACT OF 1964 § 1.4 Discrimination prohibited. (a... excluded from participation in, be denied the benefits of, or be otherwise subjected to...

  14. Reproduction of 3/4 White Composite and 1/4 Duroc, 1/4 Meishan, 1/4 Fengjing, or 1/4 Minzhu gilts and sows.

    Science.gov (United States)

    Young, L D

    1998-06-01

    Females were either 1/4 Duroc, 1/4 Meishan, 1/4 Fengjing, or 1/4 Minzhu, and the remainder were 3/4 White Composite. A greater percentage of Fengjing crosses reached puberty than Duroc or Minzhu (P .05) from other breed types. After adjusting for differences in percentage detected owing to termination of observation for estrus, breed types ranked Fengjing, Meishan, Minzhu, and Duroc from youngest to oldest at puberty with approximately 14 d between adjacent breed types. Meishan and Fengjing crosses had a greater (P .05) for litter or uterine traits measured on gilts slaughtered at 60 or 100 d of gestation. Total number of pigs born was greater (P Gestation length, number born alive, number weaned, litter birth weight, or litter weaning weight for gilts did not differ (P > .05) among breed types. Duroc crosses were heavier (P .05) for backfat thickness at those times. Breed types did not differ (P > .05) for the ratio of litter gain from 0 to 28 d/total Mcal or any of the component traits in the ratio. Postweaning estrus activity, conception rate, and litter and uterine traits of sows bred for second parity were not affected (P > .05) by breed type. These analyses indicate that crossbred gilts containing 1/4 Meishan, 1/4 Fengjing, or 1/4 Minzhu will reach puberty earlier, have larger litters, and weigh less at first parity than gilts containing 1/4 Duroc, but they do not have any significant advantage in litter size at second parity.

  15. Coordination chemistry of 1,4-bis-carboxymethylcyclam, H(2)(1,4-bcc).

    Science.gov (United States)

    Tonei, Deborah M; Ware, David C; Brothers, Penelope J; Plieger, Paul G; Clark, George R

    2006-01-07

    Zinc metal reduction of the cobalt(III) complex [Co(1,4-bcc)](+) (1,4-bcc = 1,4-bis-carboxymethylcyclam) produces the corresponding cobalt(II) complex which crystallises as the coordination polymer {[Co(1,4-bcc)]ZnCl(2)}(n). A method has been developed for removal of the cobalt(III) ion from [Co(1,4-bcc)](+) and isolation of the free ligand as its hydrochloride salt, H(2)(1,4-bcc).4HCl. This has been used for the preparation of new metal complexes, and the syntheses and characterisation of the copper(ii), nickel(ii), zinc(ii) and chromium(iii) complexes containing the 1,4-bcc ligand are described. X-Ray crystal structures of {[Co(1,4-bcc)]ZnCl(2)}(n).2.5H(2)O, {[Cu(1,4-bcc)]CuCl(2)}(n).0.25MeOH.H(2)O and [Cu(1,4-bcc)H]ClO(4) show the complexes to have the trans(O) geometry of the 1,4-bcc ligand, while the structure of [Cr(1,4-bcc)H(0.5)](ClO(4))(1.5).EtOH exhibits the cis(O) configuration.

  16. 1/4-pinched contact sphere theorem

    DEFF Research Database (Denmark)

    Ge, Jian; Huang, Yang

    2016-01-01

    Given a closed contact 3-manifold with a compatible Riemannian metric, we show that if the sectional curvature is 1/4-pinched, then the contact structure is universally tight. This result improves the Contact Sphere Theorem in [EKM12], where a 4/9-pinching constant was imposed. Some tightness res...

  17. Biodegradation of 1,4-Dioxane

    Science.gov (United States)

    2007-08-01

    transferred to 950 mL QA/QC bottles with Teflon™-lined lids, and stored at 4 oC until used in microcosm set up. Site ground water from the two 1,4...P. Wackett and M. J. Sadowsky. 1997. Toluene 2-monooxygenase-dependent growth of Burkholderia cepacia G4-PR1 on diethyl ether. Appl. Environ...United States and elsewhere. Because of its miscibility in water , its low Henry’s Law constant (4.9 x 10-6 atm m3/mol), and low octanol/ water

  18. Butallylonal 1,4-dioxane hemisolvate

    Directory of Open Access Journals (Sweden)

    Ulrich J. Griesser

    2010-10-01

    Full Text Available The asymmetric unit of the title compound [systematic name: 5-(1-bromoprop-2-en-1-yl-5-sec-butylpyrimidine-2,4,6-trione 1,4-dioxane hemisolvate], C11H15BrN2O3·0.5C4H8O2, contains one half-molecule of 1,4-dioxane and one molecule of butallylonal, with an almost planar barbiturate ring [largest deviation from the mean plane = 0.049 (5 Å]. The centrosymmetric dioxane molecule adopts a nearly ideal chair conformation. The barbiturate molecules are linked together by an N—H...O hydrogen bond, giving a single-stranded chain. Additionally, each dioxane molecule acts as a bridge between two antiparallel strands of hydrogen-bonded barbiturate molecules via two hydrogen bonds, N—H...O(dioxaneO...H—N. Thus, a ladder structure is obtained, with the connected barbiturate molecules forming the `stiles' and the bridging dioxane molecules the `rungs'.

  19. SAS 3 observations of GX 1 + 4

    Science.gov (United States)

    Doty, J. P.; Lewin, W. H. G.; Hoffman, J. A.

    1981-01-01

    GX 1 + 4 is one of the brightest celestial sources of high-energy X-rays. It is a pulsar with a period of approximately 2 min (perhaps a multiple of 2 min), decreasing at a variable rate which, since 1971, has averaged approximately 2% per year, but which can be larger than 5% per year. This is the largest rate of decrease observed for any pulsar. The rate of decrease appears to be correlated with the luminosity, in support of the idea that the period decrease is produced by accretion torques acting upon a neutron star. No evidence is seen for a Doppler shift due to motion of the pulsar in a binary orbit; this is consistent with the results of optical observations which suggest that any orbital period is fairly long (months to years). The spectrum of GX 1 + 4 is measured as a function of pulse phase, as well as the phase-averaged total spectrum, and the average spectrum of the pulses alone. The shape of the average pulsed spectrum suggests that the pulsations may be produced by 'hot spots' which are a few hundred meters in extent, with temperatures of approximately 10 to the 8th K (kT being approximately equal to 8 keV).

  20. Enlarged test catalysts during the hydrogenation of 1,4-butynediol to 1,4-butanediol

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    Zhaksyntay Kairbekov

    2013-09-01

    Full Text Available The highly effective catalyzer for butynediol-1;4 hydrogenation was designed and synthesized. Enlarged tests showed that the selectivity on butanediol-1.4 at the hydrogenation of butynediol-1.4 on the alloyed catalyst SKN-39H during 320 h was 84.6 %; that on 18 % higher than for  industrial MNH. The yield of product on the catalyst SKN-39 increases slowly from 3.1 to 7.3 % when on a catalyst MNH – 7.1 to 11.7 % from the initial content of butynediol-1;4. At the hydrogenation of  butynediol on catalyst SKN-39H process efficiency increases in 1.5-2 times and product purity on 2-3 % is higher in comparing with the industrial catalyst MNH. 

  1. 1,4-Dihydro-1,4-diphosphinine fused with two tetrathiafulvalenes.

    Science.gov (United States)

    Avarvari, Narcis; Fourmigué, Marc

    2004-12-21

    Electrochemical and theoretical investigations demonstrate through-bond interactions between two TTF moieties fused to a 1,4-dihydro-1,4-diphosphinine, for which the single crystal X-ray structure of the cis isomer is described together with that of a mixed-valent, charge-localized, radical cation salt with Mo6O19(2-), obtained upon electrocrystallization of the same cis isomer.

  2. Analysis of Horace ode 1.4

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    Nada Grošelj

    1999-12-01

    Full Text Available On its most obvious level, Ode 1.4 by Quintus Horatius Flaccus consists of two jarringly discrepant and seemingly unrelated parts, beginning with an idyllic depiction of spring and switching to a morbid obsession with the shortness of life, which results in the "carpe diem" philosophy. On closer inspection, however, the first part encompasses not only spring but a whole cycle of seasons, gliding from very early spring (or late winter to an almost summerlike period. In the second part, this passage of time is used as a parallel for the cycle of life, with the spring and summer as symbolic of youth and winter as emblematic of death. The combination of the two parts thus stems from a well-considered purpose rather than random association. However, the full impact of the work is only understood when it is read as a whole, composed of many parts influencing each other, since a Horatian poem is subtly held together by a careful choice of words and their positions, which form links, .reflections and contrasts. In particular this ode shows a technique of oblique and highly economical mode of expression, so that the intent of many nuances easily escapes notice.

  3. 1-Methylpiperazine-1,4-diium dipicrate

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    Grzegorz Dutkiewicz

    2011-02-01

    Full Text Available In the crystal structure of the title compound [systematic name: 1-methylpiperazine-1,4-diium bis(2,4,6-trinitrophenolate], C5H14N22+·2C6H2N3O7−, the ionic components are connected by relatively strong N—H...O hydrogen bonds into centrosymmetric six-membered conglomerates, which comprise two dications and four anions. Besides Coulombic interactions, only weak C—H...O interactions and some stacking between picrates (separation between the planes of ca. 3.4 Å but only a small overlapping can be identified between these `building blocks' of the crystal structure. The piperazine ring adopts a chair conformation with the methyl substituent in the equatorial position. In the picrate anions, the twist angles of the nitro groups depend on their positions relative to the phenolate O atom: it is much smaller for the NO2 groups para to the C—O− group [15.23 (9and 3.92 (14°] than for the groups in the ortho positions [28.76 (13–39.84 (11°].

  4. 76 FR 7703 - 1,4-Benzenedicarboxylic Acid, Dimethyl Ester, Polymer With 1,4-Butanediol, Adipic Acid, and...

    Science.gov (United States)

    2011-02-11

    ... AGENCY 40 CFR Part 180 1,4-Benzenedicarboxylic Acid, Dimethyl Ester, Polymer With 1,4- Butanediol, Adipic... from the requirement of a tolerance for residues of 1,4-benzenedicarboxylic acid, dimethyl ester... residues of 1,4-benzenedicarboxylic acid, dimethyl ester, polymer with 1,4-butanediol, adipic acid,...

  5. 8,8-Diethyl-1,4,5,8-tetrahydronaphthalene-1,4,5-trione

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    Ramiro Araya-Maturana

    2009-02-01

    Full Text Available The title molecule, C14H14O3, contains two fused six-membered carbon rings with keto groups at positions 1, 4 and 5 and a gem-diethyl group at position 8. The molecule is close to planar (maximum deviation = 0.044 Å, with one ethyl group at each side of the molecular plane, with exception of the keto group at position 1 which is slightly deviated from the plane and disordered over two positions one on each side of it (occupancies 0.80/0.20. The packing of the molecule shows weak bonded chains along a through C—H...O contacts and two intramolecular C—H...O interactions are also present.

  6. Life History and Production of the Western Gray Whale's Prey, Ampelisca eschrichtii Kroyer, 1842 (Amphipoda, Ampeliscidae.

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    Natalia L Demchenko

    Full Text Available Ampelisca eschrichtii are among the most important prey of the Western North Pacific gray whales, Eschrichtius robustus. The largest and densest known populations of this amphipod occur in the gray whale's Offshore feeding area on the Northeastern Sakhalin Island Shelf. The remote location, ice cover and stormy weather at the Offshore area have prevented winter sampling. The incomplete annual sampling has confounded efforts to resolve life history and production of A. eschrichtii. Expanded comparisons of population size structure and individual reproductive development between late spring and early fall over six sampling years between 2002 and 2013 however, reveal that A. eschrichtii are gonochoristic, iteroparous, mature at body lengths greater than 15 mm and have a two-year life span. The low frequencies of brooding females, the lack of early stage juveniles, the lack of individual or population growth or biomass increases over late spring and summer, all indicate that growth and reproduction occur primarily in winter, when sampling does not occur. Distinct juvenile and adult size cohorts additionally indicate growth and juvenile production occurs in winter through spring under ice cover. Winter growth thus requires that winter detritus or primary production are critical food sources for these ampeliscid populations and yet, the Offshore area and the Eastern Sakhalin Shelf ampeliscid communities may be the most abundant and productive amphipod population in the world. These A. eschrichtii populations are unlikely to be limited by western gray whale predation. Whether benthic community structure can limit access and foraging success of western gray whales is unclear.

  7. Towards Integrated Multi-Trophic Aquaculture: Lessons from Caprellids (Crustacea: Amphipoda.

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    José Manuel Guerra-García

    Full Text Available The search for alternative live feed organisms and the progression of Integrative Multi-Trophic Aquaculture (IMTA are currently being highly prioritised in EU strategies. Caprellids could potentially be an important exploitable resource in aquaculture due to their high levels of beneficial polyunsaturated fatty acids, fast growing nature and widespread distribution. Furthermore, since they are mainly detritivorous, they could be excellent candidates for integration into IMTA systems, potentially benefitting from uneaten feed pellets and faeces released by cultured fish in fish farms and sea-cage structures. Despite this, there is a lack of experimental studies to: (i test inexpensive diets for caprellids, such as detritus, (ii develop sustainable caprellid culture techniques and (iii include caprellids in IMTA systems. The main aim of this study was to determine whether detritus (D in the form of fish faeces provided an adequate diet for caprellids in comparison to other traditional diets, such as Artemia nauplii (A or phytoplankton (P. Adult survival rate was shown to be significantly higher for caprellids fed with D. Conversely, hatchlings had the highest survival rate with A, although the juvenile growth rate and number of moults was similar in the three diets. With regard to lipid composition, caprellids fed with A had higher concentrations of Triacylglycerols (TAG and Phosphatidylcholine (PC while those fed with P or D were richer in polyunsaturated fatty acids, especially 22:6(n-3 (DHA. Interestingly, caprellids fed with D were also a rich source of 18:2(n-6 (LA, considered to be an essential fatty acid in vertebrates. It was found that detritus based mainly on fish faeces and uneaten feed pellets can be considered an adequate feed for adult caprellids, providing a source of both omega-3 (DHA and omega-6 (LA fatty acids. Hatchlings however seem to require an additional input of TAG and PC during juvenile stages to properly grow.

  8. 40 CFR 721.990 - 1,4-Benzedicarboxylic acid, dimethyl ester, polymer with 1,4 - butanediol, cyclized.

    Science.gov (United States)

    2010-07-01

    ... ester, polymer with 1,4 - butanediol, cyclized. 721.990 Section 721.990 Protection of Environment..., dimethyl ester, polymer with 1,4 - butanediol, cyclized. (a) Chemical substance and significant new uses subject to reporting. (1) The chemical substance identified as 1,4-benzedicarboxylic acid, dimethyl...

  9. On the presence of the Mediterranean endemic Microdeutopus sporadhi Myers, 1969 (Crustacea: Amphipoda: Aoridae in the Gulf of Naples (Italy with a review on its distribution and ecology

    Directory of Open Access Journals (Sweden)

    M. B. SCIPIONE

    2013-07-01

    Full Text Available The species Microdeutopus sporadhi (Crustacea: Amphipoda: Aoridae, endemic of the Mediterranean Sea, was described by Myers in 1969 on material collected from the Aegean Sea in a sheltered environment with high sedimentation rates. A check on the distribution and ecology of M. sporadhi showed that: — although not mentioned in the checklist of amphipods of the Italian seas, it was already found in the central Tyrrhenian Sea in 1983-84 and in the northern Adriatic Sea in 2002-03; — it was rarely found in the Mediterranean Sea, one of the most studied basins as concerns amphipod fauna; but notwithstanding the few records available, the wide ecological spectrum of this species was pointed out. The present study, conducted off the Island of Ischia (Gulf of Naples, Italy, showed the presence of rich and well established populations through time, but only in a peculiar substratum (artificial collectors and environment (low pH values. The species seems to be able to withstand harsh environmental conditions and probably to conceal itself through a cryptic behaviour, escaping traditional sampling methods. The role of rare or hidden species in bio-assessment should be re-evaluated.

  10. Secondary production of Ampelisca mississippiana Soliman and Wicksten 2007 (Amphipoda, Crustacea) in the head of the Mississippi Canyon, northern Gulf of Mexico

    Science.gov (United States)

    Soliman, Y. S.; Rowe, G. T.

    2008-12-01

    Annual production was calculated for the dominant ampeliscid amphipod Ampelisca mississippiana [Soliman, Y., Wicksten, M., 2007. Ampelisca mississippiana a new species (Amphipoda: Gammaredea) dominated the head of the Mississippi Canyon (Northern Gulf of Mexico). Zootaxa, submitted] at the head of the Mississippi Canyon in the northern Gulf of Mexico. Average densities were 12,094±2499 ind m -2, with secondary production of 6.93 g dry wt m -2 yr -1, based on the "size-frequency method" [Hynes-Hamilton, H.B.N., Coleman, M., 1968. A simple method for assessing the annual production of stream benthos. Limnology and Oceanography 13, 569-573; Menzies, C.A., 1980. A note on the Hynes-Hamilton method of estimating secondary production. Limnology and Oceanography 25(4), 770-773], with a production/biomass ( P/ B) ratio of 3.11. Growth rates of this magnitude are comparable to available data for freshwater and shallow marine ampeliscids, but are unexpectedly high for deep-ocean habitats. Growth efficiency appeared to be approximately 35% (Growth/Assimilation×100).

  11. The 1.4 GHZ light curve of GRB 970508

    NARCIS (Netherlands)

    Galama, TJ; Wijers, RAMJ; Groot, PJ; Strom, RG; De Bruyn, AG; Kouveliotou, C; Robinson, CR; van Paradus, J

    1998-01-01

    We report on Westerbork 1.4 GHz radio observations of the radio counterpart to gamma-ray burst GRB 970508, between 0.80 and 138 days after this event. The 1.4 GHz light curve shows a transition from optically thick to thin emission between 39 and 54 days after the event. We derive the slope p of the

  12. First Synthesis of 1,4-Dimethoxy-2-Naphthoxyacetic acid.

    Science.gov (United States)

    Chinea, Kimberly; Banerjee, Ajoy K

    2015-07-01

    2-Acetyl-1-hydroxynaphthalene was converted into 1,4-dimethoxy-2-naphthoxyacetic acid in seven steps (methylation, Bayer-Villiger oxidation, hydrolysis, bromination, methylation, alkylation and hydrolysis). 2-Hydroxy-1,4-naphthoquinone on acetylation, aromatization, methylation and hydrolysis, respectively, also yielded the title compound.

  13. Regioselective oxidation of unprotected 1,4 linked glucans

    NARCIS (Netherlands)

    Eisink, Niek N.H.M.; Lohse, Jonas; Witte, Martin D.; Minnaard, Adriaan J.

    2016-01-01

    Palladium-catalyzed alcohol oxidation allows the chemo- and regioselective modification of unprotected 1,4 linked glucans. This is demonstrated in the two-step bisfunctionalization of 1,4 linked glucans up to the 7-mer. Introduction of an anomeric azide is followed by a highly regioselective mono-ox

  14. Well staged

    Energy Technology Data Exchange (ETDEWEB)

    Budd, Godfrey

    2011-06-15

    Packers Plus Energy Services Inc. has commercially launched QuickFRAC, a multi-stage completition system which can fracture four to five isolated stages in one treatment and set up a record of 23-stage slickwater frac in less than 10 hours. It could take up to 40 days to do 100 fracture treatments with other systems. This technology makes it possible to distribute fluid at each port thanks to the limited entry system. In order to make multiple isolated stages within one treatment zone, each zone includes multiple QuickPORT sleeves with packers on either side. The other technology which made this possible is the repeater port system, it allows them to perform more frac stages. This technology could be useful in the future since the need for stages will be doubling soon with microdarcy shale oil extraction which is more difficult than gas.

  15. Toxicity Effects of 1,4-Dinitrobenzene on Oryzias Latipes

    Institute of Scientific and Technical Information of China (English)

    XU Jing-bo; JING Ti-song; LIANG Lin; SHENG Lian-xi

    2005-01-01

    1,4-Dinitrobenzene(1,4-DNB) is one of the preferential toxicants stipulated by OECD and EPA of USA.With Oryzias latipes, which were chosen as the acceptors according to the international standard, the acute,subacute and accumulative toxicity experiments were conducted. The threshold mass concentration of O.latipes was 1.360 mg/L. The subacute experiment showed that O. latipes were hardly affected when the mass concentration of 1,4-DNB was 0. 0292 mg/L, but were significantly affected when the mass concentration of 1,4-DNB was 0. 0420, 0. 0608 or 0. 0875 mg/L in contrast to the control sample(P<0. 05). The accumulative rate(K) was 1.21. This shows that there are significant accumulative actions of 1,4-DNB in fish. When the mass concentration of 1,4-DNB is in the range of 0. 032-0. 320 mg/L, the higher the 1,4-DNB concentration, the more strongly the Na+/K+-ATPase is inhibited. The calculated IC50 values in gill, kidney and liver of O. latipes are 0. 128, 0. 132 and 0. 428 mg/L, respectively.

  16. PREPARATION AND CHARACTERIZATION OF cis-1,4- POLYBUTADIENE CONTAINING A FRACTION OF trans- 1,4-POLYBUTADIENE

    Institute of Scientific and Technical Information of China (English)

    HU Zhenya; LI Shuquan; LIN Yunqing

    1984-01-01

    Polymerization of butadiene catalysed first with V(acac)3-Al(i-Bu)2Cl, then with Co(acac)3-H2O-Al(i-Bu)2Cl has been studied. The polymer obtained was identified to be a new variety of cis-1,4-polybutadiene which contained a fraction of trans-1,4-polybutadiene chemically bonded to the cis-1,4-polybutadiene chains. Its molecular weight and trans-1,4 content can be regulated by varying the catalyst composition and concentration as well as other polymerization conditions. The trans-1,4fraction, although it presents only in 9-16%, forms a crystalline phase in the matrix at room temperature and facilitates the crystallization of the polymer.

  17. Trading stages

    DEFF Research Database (Denmark)

    Steiner, Uli; Tuljapurkar, Shripad; Coulson, Tim

    2012-01-01

    Interest in stage-and age structured models has recently increased because they can describe quantitative traits such as size that are left out of age-only demography. Available methods for the analysis of effects of vital rates on lifespan in stage-structured models have not been widely applied ...... examples. Much of our approach relies on trading of time and mortality risk in one stage for time and risk in others. Our approach contributes to the new framework of the study of age- and stage-structured biodemography....

  18. Single and combined effects of cadmium and arsenate in Gammarus pulex (Crustacea, Amphipoda): Understanding the links between physiological and behavioural responses

    Energy Technology Data Exchange (ETDEWEB)

    Vellinger, Céline, E-mail: celine.vellinger@gmail.com [Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), CNRS UMR 7360, Université de Lorraine – Metz (France); Gismondi, Eric, E-mail: gismondi.eric@gmail.com [Laboratoire d’Ecologie animale et d’Ecotoxicologie, Institut de Chimie, Université de Liège, Allée du 6 Août 15, B-4000 Sart-Tilman, Liège (Belgium); Felten, Vincent, E-mail: vincent.felten@univ-lorraine.fr [Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), CNRS UMR 7360, Université de Lorraine – Metz (France); Rousselle, Philippe, E-mail: rousselle@univ-lorraine.fr [Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), CNRS UMR 7360, Université de Lorraine – Metz (France); Mehennaoui, Kahina, E-mail: meh_kahina@yahoo.fr [Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), CNRS UMR 7360, Université de Lorraine – Metz (France); Parant, Marc, E-mail: parant@univ-lorraine.fr [Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), CNRS UMR 7360, Université de Lorraine – Metz (France); Usseglio-Polatera, Philippe, E-mail: usseglio-polatera@univ-lorraine.fr [Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), CNRS UMR 7360, Université de Lorraine – Metz (France)

    2013-09-15

    Highlights: •Linking physiological to behavioural responses of G. pulex exposed to AsV and/or Cd. •AsV and/or Cd exposure exhibited similar biomarkers responses. •Contamination increases the mobilization of detoxification systems in gammarids. •Both changes in energy reserve use and allocation are involved in gammarid response. •Increased lipid peroxidation could be the cause of increasing gammarid mortality. -- Abstract: This study aimed at investigating the individual and interactive effects of cadmium (Cd) and arsenate (AsV) in Gammarus pulex (Crustacea, Amphipoda) through the use of several biomarkers. Individuals were exposed for 240 h to two concentrations of AsV or Cd alone, and all the possible binary mixtures of these concentrations of AsV and Cd in a complete factorial design. The pattern of the biomarkers’ responses to Cd and AsV alone or in mixture was similar in Gammarus pulex, even if the response intensity varied depending on the tested conditions. G. pulex responded to contamination with increased mobilization of the detoxification systems [i.e. γ-glutamyl-cystein ligase activity (GCL), reduced glutathione content (GSH) and metallothionein concentrations (MT)]. This response seems to imply changes in energy reserve utilization (total lipids and proteins are used prior to glycogen reserves), but also a possible energy reallocation from locomotion to detoxification processes. The observed increase in lipid peroxidation could be relied to the increasing gammarid mortality, despite the higher mobilization of detoxification systems. Even if the outcome of the complex interactions between AsV and Cd remains difficult to unravel, such studies are critically important for better assessing the effects of stressors on organisms, populations and communities in a multi-contamination context of ecosystems.

  19. Improved features of MARS 1.4 and verification

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Won Jae; Chung, Bub Don; Jeong, Jae Jun; Ha, Kwi Seok [Korea Atomic Energy Research Institute, Taejon (Korea)

    1999-09-01

    MARS 1.4 code has been developed as a basic code frame for multi-dimensional thermal-hydraulic analysis of light water reactor transients. This report describes the newly improved features of MARS 1.4 and their verification results. The new features of MARS 1.4 include the implementation of point kinetics model in the 3D module, the coupled heat structure model, the extension of control functions and input check functions in the 3D module, the implementation of new features of RELAP5/MOD3.2.2 -version, the addition of automatic initialization function for fuel 3-D analysis and the unification of material properties and forcing functions, etc. These features have been implemented in the code in order to extend the code modeling capability and to enhance the user friendliness. Among these features, this report describes the implementation of new features of RELAP5/MOD3.3.3-version such as reflood model and critical heat flux models, etc., the automatic initialization function, the unification of material properties and forcing functions and the other code improvements and error corrections, which were not reported in the previous report. Through the verification calculations, the new features of MARS 1.4 have been verified well implemented in the code. In conclusion, MARS 1.4 code has been developed and verified as implemented in the code. In conclusion, MARS 1.4 code has been developed and verified as a multi-dimensional system thermal-hydraulic analysis tool. And, it can play its role as a basic code frame for the future development of a multi-purpose consolidated code, MARS 2.x, for coupled analysis of multi-dimensional system thermal hydraulics, 3D core kinetics, core CHF and containment as well as for further improvement of thermal-hydraulic and numerical models. 4 refs., 10 figs. (Author)

  20. Amino acid derived 1,4-dialkyl substituted imidazolones

    DEFF Research Database (Denmark)

    Diness, Frederik; Meldal, Morten Peter

    2010-01-01

    A general method for synthesis of 1,4-substituted imidazolones from amino acids on solid support or in solution has been developed. Amino acid derived 3-Boc-(1,3)-oxazinane (Box) protected amino aldehyde building blocks were coupled through urea bonds to the amino terminal of dipeptides or amino...

  1. N,N′-Bis(2-thienylmethylenebenzene-1,4-diamine

    Directory of Open Access Journals (Sweden)

    Nai-Wei Dong

    2009-09-01

    Full Text Available The Schiff base, C16H12N2S2, has been synthesized by refluxing an ethanolic solution of thiophene-2-carbaldehyde and benzene-1,4-diamine. The center of the benzene ring is located on a crystallographic center of inversion. The dihedral angle between the benzene and thiophene rings is 63.6 (1°.

  2. Diastereoselective and enantioselective reduction of tetralin-1,4-dione

    Directory of Open Access Journals (Sweden)

    2008-10-01

    Full Text Available BackgroundThe chemistry of tetralin-1,4-dione, the stable tautomer of 1,4-dihydroxynaphthalene, has not been explored previously. It is readily accessible and offers interesting opportunities for synthesis.ResultsThe title reactions were explored. L-Selectride reduced the diketone to give preferentially the cis-diol (d.r. 84 : 16. Red-Al gave preferentially the trans-diol (d.r. 13 : 87. NaBH4, LiAlH4, and BH3 gave lower diastereoselectivities (yields: 76–98%. Fractional crystallization allowed isolation of the cis-diol and the trans-diol (55% and 66% yield, respectively. Borane was used to cleanly give the mono-reduction product. Highly enantioselective CBS reductions afforded the trans-diol (72% yield, 99% ee and the mono-reduction product (81%, 95% ee.ConclusionDiastereoselective and enantioselective reductions of the unexplored tetralin-1,4-dione provides a very convenient entry into a number of synthetically highly attractive 1,4-tetralindiols and 4-hydroxy-1-tetralone.

  3. Chemoenzymatic Synthesis of Enantiopure 1,4-Dihydropyridine Derivates

    NARCIS (Netherlands)

    Sobolev, A.; Franssen, M.C.R.; Duburs, G.; Groot, de Æ.

    2004-01-01

    1,4-Dihydropyridines possess a broad range of biological activities, such as the ability to control the influx of calcium into cells, as well as neuroprotective, antineuro-degenerative, cognition and memory enhancing, anti-inflammatory, antiviral and many other properties. Chirality plays an importa

  4. Palun, teie 1,4 miljardit / Keit Pentus

    Index Scriptorium Estoniae

    Pentus, Keit, 1976-

    2008-01-01

    Ilmunud ka: Hiiu Leht 19. veebr. lk. 2, Tallinnskii Vestnik veebr. lk. 6, Meie Maa 20. veebr. lk. 2, Sakala 22. veebr. lk. 2, Elva Postipoiss 23. veebr. lk. 2, Koit 28. veebr. lk. 6. Linnadel ja valdadel on kasutada uute lasteaia- ja sõimekohtade loomiseks ning olemasolevate lasteasutuste seisukorra parandamiseks 1,4 miljardit krooni riigieelarve raha

  5. Regulation of inositol 1,4,5-trisphosphate receptor expression

    NARCIS (Netherlands)

    Deelman, Leo Edwin

    1999-01-01

    This thesis describes the regulation of the inositol 1,4,5-triphosphate receptor (InsP3R). The mechanisms of InsP3R regulation were investigated after cloning of the promoters of the human and rat InsP3R-1 gene and visualization of subcellular distribution of InsP3R-3 by immunoelectron microscopy (c

  6. Multicomponent Synthesis of Diverse 1,4-Benzodiazepine Scaffolds

    NARCIS (Netherlands)

    Huang, Yijun; Khoury, Kareem; Chanas, Tyler; Domling, Alexander

    2012-01-01

    The 1,4-benzodiazepine (BDZ) scaffold is of particular interest in drug design due to a balanced ensemble of beneficial physicochemical properties including a semirigid and compact diazepine ring with spatial placements of several substituents, combined with low number of rotatable bonds, hydrogen b

  7. Electronic states of 1,4-bis(phenylethynyl)benzene

    DEFF Research Database (Denmark)

    Nguyen, Duy Duc; Jones, Nykola; Hoffmann, Søren Vrønning

    2012-01-01

    The electronic transitions of 1,4-bis(phenylethynyl)benzene (BPEB) were investigated by UV synchrotron radiation linear dichroism (SRLD) spectroscopy in the range 25,000 – 58,000 cm–1 (400 – 170 nm) on molecular samples aligned in stretched polyethylene. The investigation was supported by variable...

  8. 14 CFR Sec. 1-4 - System of accounts coding.

    Science.gov (United States)

    2010-01-01

    ... General Accounting Provisions Sec. 1-4 System of accounts coding. (a) A four digit control number is... digit code assigned to each profit and loss account denote a detailed area of financial activity or... sequentially within blocks, designating more general classifications of financial activity and...

  9. Staging atmospheres

    DEFF Research Database (Denmark)

    Bille, Mikkel; Bjerregaard, Peter; Sørensen, Tim Flohr

    2015-01-01

    The article introduces the special issue on staging atmospheres by surveying the philosophical, political and anthropological literature on atmosphere, and explores the relationship between atmosphere, material culture, subjectivity and affect. Atmosphere seems to occupy one of the classic...... localities of tensions between matter and the immaterial, the practical and the ideal, and subject and object. In the colloquial language there can, moreover, often seem to be something authentic or genuine about atmosphere, juxtaposing it to staging, which is implied to be something simulated or artificial....... This introduction seeks to outline how a number of scholars have addressed the relationship between staged atmospheres and experience, and thus highlight both the philosophical, social and political aspects of atmospheres...

  10. Skeletally Diverse Synthesis of Innovative [2,1-c]-1,4-Oxazepine and [1,4]-Quinoxaline Systems.

    Science.gov (United States)

    Lee, Chia-Hsin; Wu, Wen-Chun; Dangate, Prasad S; Shen, Li-Ching; Chung, Wen-Sheng; Sun, Chung-Ming

    2015-10-12

    An efficient, innovative synthesis of [2,1-c]-1, 4-oxazepine and [1,4]-quinoxaline heterocycles along with the embodied pyrimido-pyrrolo motifs was established. Initially, the pyrrole ring was installed using microwave irradiation through an intramolecular base-catalyzed cyclization between acetyl bromomethyl pyrimidine dione and o-amino phenyl methanol or o-phenylenediamine methyl benzoates. Furthermore, oxazepine, and quinoxaline scaffolds were constructed by an acid-catalyzed condensation with a variety of aldehydes by an unconventional Pictet-Spengler reaction strategy. An important aspect of this work is to build novel heterocyclic ring systems with potential medicinal interest.

  11. 21 CFR 177.1240 - 1,4-Cyclohexylene dimethylene terephthalate and 1,4-cyclohexylene dimethylene isophthalate...

    Science.gov (United States)

    2010-04-01

    ...) INDIRECT FOOD ADDITIVES: POLYMERS Substances for Use as Basic Components of Single and Repeated Use Food..., manufacturing, packing, processing, preparing, treating, packaging, transporting, or holding food, subject to... 21 Food and Drugs 3 2010-04-01 2009-04-01 true 1,4-Cyclohexylene dimethylene terephthalate and...

  12. Electronic transport through thiophene-1,4-dithiol molecule

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Sergio Selma dos; Hobbi Junior, Edwin; Correia, Nestor Santos, E-mail: sergioss2001@yahoo.com.br [Universidade Estadual de Santa Cruz (UESC), Ilheus, BA (Brazil). Campus Soane Nazare de Andrade

    2015-08-15

    In this paper, we study electronic transport through thiophene-1,4-dithiol molecules attached to gold electrodes Au (111) and subjected to bias voltage. The choice of this molecule is justified by its promising applications in the construction of molecular devices. The electronic structure of thiophene-1,4-dithiol was investigated by using Density Functional Theory (DFT) combined with non-equilibrium Green's functions (NEGF), as implemented in TRANSIESTA program. We found that both an increased separation between the electrodes and the presence of anchor group S, cause an increase in transmittance through the molecule. Also, we obtain a structure in the transmittance curve, a Fano resonance feature, present in electronic transport phenomena in nanostructured devices. The results are reported in terms of transmittance versus energy around Fermi Level and voltage versus current plots. (author)

  13. Thermophysical study of 1,4-dioxane with cycloalkane mixtures

    Energy Technology Data Exchange (ETDEWEB)

    Romero, C. [Departamento de Quimica Organica-Quimica Fisica, Facultad de Ciencias, Universidad de Zaragoza, Ciudad Universitaria, 50009 Zaragoza (Spain); Giner, B. [Departamento de Quimica Organica-Quimica Fisica, Facultad de Ciencias, Universidad de Zaragoza, Ciudad Universitaria, 50009 Zaragoza (Spain); Haro, M. [Departamento de Quimica Organica-Quimica Fisica, Facultad de Ciencias, Universidad de Zaragoza, Ciudad Universitaria, 50009 Zaragoza (Spain); Artigas, H. [Departamento de Quimica Organica-Quimica Fisica, Facultad de Ciencias, Universidad de Zaragoza, Ciudad Universitaria, 50009 Zaragoza (Spain); Lafuente, C. [Departamento de Quimica Organica-Quimica Fisica, Facultad de Ciencias, Universidad de Zaragoza, Ciudad Universitaria, 50009 Zaragoza (Spain)]. E-mail: celadi@unizar.es

    2006-07-15

    Densities, refractive indices, and surface tension for the binary mixtures 1,4-dioxane with cyclopentane or cylohexane have been determined at ambient pressure and at T = (283.15, 298.15, and 313.15) K. Excess volumes and refractive index and surface tension deviations have been calculated from the experimental data. Several relations between the thermophysical properties studied here have been tested using our experimental results.

  14. 1-Cyclohexyl-6,7-dimethoxy-1,4-dihydronaphthalene

    Directory of Open Access Journals (Sweden)

    Shao-Yuan Chen

    2014-06-01

    Full Text Available The title compound, C18H24O2, was isolated from the leaves extract of Ficus carica L. The cyclohexane ring displays a chair conformation whereas the cyclohexa-1,4-diene ring adopts a flattened boat conformation with methyl C atoms at the prow and stern. In the crystal, molecules are linked by weak C—H...O hydrogen bonds into supramolecular chains propagated along the b-axis direction.

  15. GHB, GBL and 1,4-BD addiction.

    Science.gov (United States)

    Brunt, Tibor M; van Amsterdam, Jan G C; van den Brink, Wim

    2014-01-01

    A growing body of evidence shows that gamma-hydroxybutyric acid (GHB) is an addictive substance. Its precursors gammabutyrolactone (GBL) and 1,4-butanediol (1,4-BD) show the same properties and may pose even more risks due to different pharmacokinetics. There are indications that problematic GHB use is increasing in the European Union. This review investigates the existing literature on the neurochemistry of GHB and its precursors, their acute toxicity, addiction potential and withdrawal, the proposed molecular mechanism underlying addiction and the treatment of withdrawal and addiction. Current evidence shows that GHB and its precursors are highly addictive, both in humans and animals, probably through a GABAB receptor related mechanism. Severity of withdrawal symptoms can be considered as a medical emergency. Recent studies suggest that benzodiazepines are not very effective, showing a high treatment resistance, whereas detoxification with pharmaceutical GHB proved to be successful. However, relapse in GHB use is frequent and more research is warranted on relapse prevention. This might aid medical practitioners in the field and improve general understanding of the severity of addiction to GHB, GBL and 1,4-BD.

  16. Staging Mobilities

    DEFF Research Database (Denmark)

    Jensen, Ole B.

    In recent years, the social sciences have taken a “mobilities turn.” There has been a developing realisation that mobilities do not “just happen.” Mobilities are carefully and meticulously designed, planned and staged (from above). However, they are equally importantly acted out, performed...... that mobility is more than movement between point A and B. It explores how the movement of people, goods, information, and signs influences human understandings of self, other and the built environment. Moving towards a new understanding of the relationship between movement, interaction and environments......, the book asks: what are the physical, social, technical, and cultural conditions to the staging of contemporary urban mobilities?...

  17. ER-1422: Biodegradation of 1,4-Dioxane

    Science.gov (United States)

    2007-08-01

    transferred to 950 mL QA/QC bottles with Teflon™-lined lids, and stored at 4 oC until used in microcosm set up. Site ground water from the two 1,4...2-monooxygenase-dependent growth of Burkholderia cepacia G4-PR1 on diethyl ether. Appl. Environ. Microbiol. 63:1606-1609. 6. Janssen, D. B., J...United States and elsewhere. Because of its miscibility in water , its low Henry’s Law constant (4.9 x 10-6 atm m3/mol), and low octanol/ water

  18. Space-Dependent Dynamics in 1,4-Polybutadiene Nanocomposite

    Science.gov (United States)

    2013-01-01

    Polymers. In Encyclopedia of Analytical Chemistry ; John Wiley & Sons: New York, 2012. (7) Zajac, W.; Gabrys, B. J.; McGreevy, R.; Mattssons, B. Physica B...Space-Dependent Dynamics in 1,4-Polybutadiene Nanocomposite J. H. Roh,† M. Tyagi,‡,∥ T. E. Hogan,§ and C. M. Roland*,† † Chemistry Division, Code 6120...PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) Naval Research Laboratory, Chemistry Division, Code 6120,Washington,DC,20375 8. PERFORMING ORGANIZATION

  19. 1,4-Disilacyclohexa-2,5-diene

    DEFF Research Database (Denmark)

    Tibbelin, Julius; Wallner, Andreas; Emanuelsson, Rikard;

    2014-01-01

    arranged into a cycle. Remarkable variations in the lowest electronic excitation energies, lowest ionization energies, and the first oxidation potentials were observed upon change of substituents, as determined by gas phase ultraviolet (UV) absorption spectroscopy, ultraviolet photoelectron spectroscopy......2,3,5,6-Tetraethyl-1,4-disilacyclohexa-2,5-dienes with either four chloro (1a), methyl (1b), or trimethylsilyl (TMS) (1c) substituents at the two silicon atoms were examined in an effort to design rigid compounds with strong neutral cross-hyperconjugation between π- and σ-bonded molecular segments...

  20. Photoluminescent carbon dots from 1,4-addition polymers.

    Science.gov (United States)

    Jiang, Zhiqiang; Nolan, Andrew; Walton, Jeffrey G A; Lilienkampf, Annamaria; Zhang, Rong; Bradley, Mark

    2014-08-25

    Photoluminescent carbon dots were synthesised directly by thermopyrolysis of 1,4-addition polymers, allowing precise control of their properties. The effect of polymer composition on the properties of the carbon dots was investigated by TEM, IR, XPS, elemental analysis and fluorescence analysis, with carbon dots synthesised from nitrogen-containing polymers showing the highest fluorescence. The carbon dots with high nitrogen content were observed to have strong fluorescence in the visible region, and culture with cells showed that the carbon dots were non-cytotoxic and readily taken up by three different cell lines.

  1. Bis[diethyl(hydroxyammonium] benzene-1,4-dicarboxylate

    Directory of Open Access Journals (Sweden)

    De-Ming Xie

    2010-08-01

    Full Text Available In the centrosymmetric title compound, 2C4H12NO+·C8H4O42−, two N,N-diethyl(hydroxyammonium cations are linked to a benzene-1,4-dicarboxylate dianion by a combination of O—H...O and N—H...O hydrogen bonds, which can be described in graph-set terminology as R22(7. The crystal structure is further stabilized by C—H...O hydrogen bonds, leading to the fomation of a ribbon-like network.

  2. ESTUDIO DE SENSORES DERIVADOS DE 1,4-DIFENILPIRIDINIO

    OpenAIRE

    TIRAPEGUI CALQUIN; CRISTIAN ANDRES

    2011-01-01

    En esta tesis, se estudiaron dos tipos de sensores, solvatocrómicos y radicalarios. Ambas familias presentan en su estructura básica un esqueleto molecular común, el 1,4-difenilpiridinio, el que se ha seleccionado por la versatilidad que presenta desde el punto de vista sintético, y por sus conocidas características fotoquímicas. Diversas técnicas espectroscópicas, como espectroscopía de fluorescencia , UV-visible, resonancia paramagnética electrónica (EPR) y resonancia magnética nuclear d...

  3. Sorption and desorption of 1,4-dichlorobenzene on peat

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    Sorption and desorption of 1,4-dichlorobenzene (DCB) on peat (>92% organic matter)display large-scale hysteresis and nonlinearity. The magnitude of desorption hysteresis decreases in the order: untreated Pahokee peat (P)>acid treated peat (FP)>humin (TP). The desorption percentages are lower than 28% of the sorbed 1, 4-DCB after desorbing for 6 days. The sorption and desorption isotherms are well fitted to Freundlich equation, whose parameter 1/n ranges from 0.055 to 0.527. Moreover, the parameter 1/n of the desorption isotherm is significantly lower than that of the sorption isotherm, but the parameter IogK increases on contrary to 1/n. The desorption isotherms are very well fitted to Langmuir equation, whose Qm decreases in the order: TP>FP>P.The apparent partition coefficients (Kp) increase with increasing sorption time or decreasing aqueous equilibrium concentration of DCB. And Kp of P is significantly higher than that of FP or TP.

  4. Spin period evolution of GX 1+4

    CERN Document Server

    González-Galán, A; Kretschmar, P; Larsson, S; Postnov, K; Kochetkova, A; Finger, M H

    2011-01-01

    We report on the long-term evolution of the spin period of the symbiotic X-ray pulsar GX 1+4 and a possible interpretation within a model of quasi-spherical accretion. New period measurements from BeppoSAX/WFC, INTEGRAL/ISGRI and Fermi/GBM observations have been combined with previously published data from four decades of observations. During the 1970's GX 1+4 was spinning up with the fastest rate among the known X-ray pulsars at the time. In the mid 1980's it underwent a change during a period of low X-ray flux and started to spin down with a rate similar in magnitude to the previous spin up rate. The spin period has changed from ~110 s to ~160 s within the last three decades. Our results demonstrate that the overall spin down trend continues and is stronger than ever. We compare the observations with predictions from a model assuming quasi-spherical accretion from the slow wind of the M giant companion.

  5. Transesterification Kinetics of Dimethyl Terephthalate with 1,4-Butanediol

    Energy Technology Data Exchange (ETDEWEB)

    Cho, Impyo; Lee, Jinhong; Jo, Sanhwan; Cho, Minjung; Han, Myungwan [Chungnam National University, Daejeon (Korea, Republic of); Kang, Kyungsuk [Siontech, Daejeon (Korea, Republic of)

    2013-02-15

    PBT (polybutylene terephthalate) has excellent mechanical properties such as low absorption, dimensional stability, abrasion resistance. It is used in manufacturing electronic components, the automobile part and the various precise parts. Bis (hydroxybutyl) terephthalate (BHBT) which is a PBT monomer, can be produced by transesterification reaction of DMT (dimethyl terephthalate) with 1,4-butandiol (BD). The kinetics of transesterification reaction of DMT with BD using zinc acetate as a catalyst was studied in a batch reactor. Previous kinetic studies was carried out in a semibatch reactor where generated methanol was removed so that reverse reactions were not considered in the kinetic expressions, resulting in inaccuracy of the kinetic model. Mathematical models of a batch reactor for the transesterification reaction were developed and used to characterize the reaction kinetics and the composition distribution of the reaction products. More accurate models than previous models was obtained and found to have a good agreement between model predictions and experimental data.

  6. [Current knowledge on gamma-hydroxybutyric acid (GHB), gamma-butyrolactone (GBL) and 1 ,4-butanediol (1,4-BD)].

    Science.gov (United States)

    Dematteis, Maurice; Pennel, Lucie; Mallaret, Michel

    2012-05-01

    Gamma-hydroxybutyric acid (GHB) is an old anaesthetic drug which was misused in the 80-90's as an anabolic agent (bodybuilding), recreational drug (drunkenness, euphoric, disinhibiting and aphrodisiac effects) and as a date rape drug (disinhibiting, hypnotic and amnesic effects). Its use in the general population is low, and mainly concerns gay population in nightclubs and young people in parties. The intoxications, above all with alcohol combination, can be severe, with coma and breathing depression, or even fatal. Chronic use leads to psychic and physical dependence; withdrawal syndrome can be severe, with agitation and delirium. In 1999, GHB classification as a narcotic resulted in the increased use of GHB prodrugs gamma-butyrolactone (GBL) and 1,4-butanediol (1,4-BD), which were easily commercially available as solvent and cleaning products. Like GHB, they have a narrow window of use, and share similar toxicity. Their increased cases of recreational use and of severe drug intoxication, abuse and dependence, led the French Ministry of Health in 2011 to prohibit their sale and transfer to the public.

  7. Niphargus plurispinosus sp. n. (Crustacea, Amphipoda, a stygophile and hypotelminorheic representative from Central Europe

    Directory of Open Access Journals (Sweden)

    Igor Hudec

    2014-06-01

    Full Text Available The detailed description of the morphology of Niphargus plurispinosus sp. n. from Slovakia is presented. Over 300 specimens were collected from a permanent seepage spring on repeated visits between May 2011 and May 2013. The type locality is located in the foothills of the Zemplínske vrchy mountains in the East Slovakian Lowland (NE part of Pannonian Lowland - small, low and isolated hills formed during Neogene volcanic activity. Volcanic rocks draw together fragments of massives of Palaezoic and Mesozoic age as same as Neogene sediments. The new species can be classified as stygophile, living in the shallow subterranean habitat. The species has small subequal gnathopods, sexually dimorphic uropod III, sexually non-dimorphic uropod I in juveniles, dimorphic uropod 1 in adults. They are extremely different in the post-reproductive stage, when they have 2-4 dorsal spines (arranged in a transverse row on the telson and supporting dorsal spines.

  8. On Potentially K1,4+P2-graphic Sequences%蕴含K1,4+P2的可图序列

    Institute of Scientific and Technical Information of China (English)

    王艳

    2008-01-01

    本文刻划了蕴含K1,4+P2的可图序列,其中K1,4+P2是向完全二部图K1,4添加一条被剖分的边后构成的简单图.%In this paper, we characterize the potentially K1,4+P2-graphic sequences, where K1,4+P2 be a graph obtained by adding an edge e which is subdivided to complete bipartite graph K1,4.

  9. Development of nuclear transfer and parthenogenetic rabbit embryos activated with inositol 1,4,5-trisphosphate.

    Science.gov (United States)

    Mitalipov, S M; White, K L; Farrar, V R; Morrey, J; Reed, W A

    1999-04-01

    The present study was carried out to evaluate the effects of different activation protocols, enucleation methods, and culture media on the development of parthenogenetic and nuclear transfer (NT) rabbit embryos. Electroporation of 25 mM inositol 1,4, 5-trisphosphate (IP3) in calcium- and magnesium-free PBS immediately induced a single intracellular calcium transient in 6 out of 14 metaphase II-stage rabbit oocytes evaluated during a 10-min recording period. The percentage of oocytes treated with IP3 followed by 6-dimethylaminopurine (IP3 + DMAP) that cleaved (83.9%) and reached the blastocyst stage (50%) was significantly higher (p < 0.05) than those activated with multiple pulses (61.6% and 30.1%, respectively) or treated with ionomycin + DMAP (52.9% and 5.7%, respectively). Development of IP3 + DMAP-activated rabbit oocytes and in vivo-fertilized zygotes in different culture media was studied. Development of activated oocytes to the blastocyst stage in Earle's balanced salt solution (EBSS) supplemented with MEM nonessential amino acids, basal medium Eagle amino acids, 1 mM L-glutamine, 0.4 mM sodium pyruvate, and 10% fetal bovine serum (FBS) (EBSS-complete) (40.6%) was significantly higher (p < 0.05) than those that developed in either Dulbecco's Modified Eagle's medium (DMEM)/RPMI + 10% FBS (15.5%) or CR1aa + 10% FBS (4%) medium. In addition, 100% of in vivo-fertilized rabbit zygotes developed to the blastocyst stage in EBSS-complete. A third set of experiments was carried out to study the efficiency of blind versus stained (Hoechst 33342) enucleation of oocytes. Twenty-nine of 48 blind enucleated and IP3 + DMAP-activated oocytes cleaved (60.4%), and 15 (31.2%) subsequently reached the blastocyst stage, whereas 9 of 52 oocytes enucleated using epifluorescence (17.3%) cleaved, and none of these reached the blastocyst stage. When the above parameters that yielded the highest blastocysts were combined in an NT experiment using adult rabbit fibroblast nuclei, 72

  10. Deep 1.4-GHz observations of diffuse polarized emission

    CERN Document Server

    Carretti, E; Reich, W; Reich, P; Fürst, E; Bernardi, G; Cortiglioni, S; Sbarra, C

    2006-01-01

    Polarized diffuse emission observations at 1.4-GHz in a high Galactic latitude area of the northern Celestial hemisphere are presented. The 3.2 X 3.2 deg^2 field, centred at RA = 10h 58m, Dec = +42deg 18' (B1950), has Galactic coordinates l~172deg, b~+63deg and is located in the region selected as northern target of the BaR-SPOrt experiment. Observations have been performed with the Effelsberg 100-m telescope. We find that the angular power spectra of the E- and B-modes have slopes of beta_E = -1.79 +/- 0.13 and beta_B = -1.74 +/- 0.12, respectively. Because of the very high Galactic latitude and the smooth emission, a weak Faraday rotation action is expected, which allows both a fair extrapolation to Cosmic Microwave Background Polarization (CMBP) frequencies and an estimate of the contamination by Galactic synchrotron emission. We extrapolate the E-mode spectrum up to 32-GHz and confirm the possibility to safely detect the CMBP E-mode signal in the Ka band found in another low emission region (Carretti et a...

  11. Spin period evolution of GX 1+4

    CERN Document Server

    González-Galán, A; Kretschmar, P; Larsson, S; Postnov, K; Kochetkova, A; Finger, M H

    2011-01-01

    We aim both to complement the existing data on the spin history of the peculiar accreting X-ray pulsar GX 1+4 with more past and current data from BeppoSAX, INTEGRAL, and Fermi and to interpret the evolution in the framework of accretion theory. We used source light curves obtained from BeppoSAX/WFC and INTEGRAL/ISGRI to derive pulse periods using an epoch-folding analysis. Fermi/GBM data were analyzed by fitting a constant plus a Fourier expansion to background-subtracted rates, and maximizing the Y2 statistic. We completed the sample with hard X-ray light curves from Swift/BAT. The data were checked for correlations between flux and changes of the pulsar spin on different timescales. The spin-down of the pulsar continues with a constant change in frequency, i.e., an apparently accelerating change in the period. Over the past three decades, the pulse period has increased by about ~50%. Short-term fluctuations on top of this long-term trend do show anti-correlation with the source flux. Possible explanations ...

  12. Levels of polychlorinated biphenyls in 1,4-dichlorobenzene mothballs

    Institute of Scientific and Technical Information of China (English)

    LIU Wen-bin; ZHENG Ming-hui; XING Ying; WANG Dong-sheng; ZHAO Xing-ru; GAO Li-rong

    2005-01-01

    Although polychlorinated biphenyls(PCBs) are globally recognized pollutant, an understanding of their resources as by-products in chemical industry is poorly investigated. This paper presents data from a study that was conducted in order to determine the extent of PCBs in 1,4-dichlorobenzene(p-DCB) mothballs. Total PCBs and dioxin-like PCBs were detected in five mothball samples. Total PCB concentrations ranged from 328 ng/g to 1798 ng/g, while the levels of WHO-TEQ were between 0.16 pg/g and 13 pg/g. Mean concentrations of total PCBs and WHO-TEQ in the samples were 724 ng/g and 3.2 pg/g, respectively. The highest level of PCB congeners was that of trichlorinated biphenyls(537 ng/g), which maybe due to the relatively low chlorination in the process of p-DCB production. A mechanism of the formation of PCBs from polychlorinated benzene in the presence of chlorine is also suggested. The results suggested that re-estimation on the risk of p-DCB products, especially the products for daily use such as mothballs, is expected.

  13. Atmospheric photochemical degradation of 1,4-unsaturated dicarbonyls

    Energy Technology Data Exchange (ETDEWEB)

    Liu, X.; Jeffries, H.E.; Sexton, K.G.

    1999-12-01

    To better understand fates of aromatics hydrocarbon species in the atmosphere, the authors have investigated the transformation chemistry of butenedial (CHOCH{double{underscore}bond}CHCHO), 4-oxo-2-pentenal (CH{sub 3}COCH{double{underscore}bond}CHCHO), and 3-hexene-2, 5-dione (CH{sub 3}COCH{double{underscore}bond}CHCOCH{sub 3}). These 1,4-unsaturated dicarbonyls are known to be products of aromatic photochemical oxidation. Both hydroxyl radical (OH) and ozone (O{sub 3}) initiated smog chamber experiments under atmospheric conditions were conducted in the University of North Carolina outdoor smog chamber. Carbonyl intermediates and products were measured using the O-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine derivatization method followed by gas chromatography/ion trap mass spectrometry analysis. Carbonyl products detected and identified by comparison with standards in the OH-initiated photooxidation of butenedial include formaldehyde, acrolein, glycolaldehyde, glyoxal, and malonaldehyde (CHOCH{sub 2}CHO). For 4-oxo-2-pentenal, the carbonyl products were formaldehyde, methyl vinyl ketone, glycolaldehyde, hydroxyacetone, glyoxal, methylglyoxal, and malonaldehyde. for 3-hexene-2,5-dione the products were formaldehyde, acetaldehyde, acetone, hydroxyacetone, and methylglyoxal. Carbonyl products detected in the P{sub 3}-initiated experiments with cyclohexane as the OH scavenger were formaldehyde and glyoxal in butenedial; formaldehyde, glyoxal, methyl-glyoxal, and malonaldehyde in 4-oxo-2-pentenal; and formaldehyde and methylglyoxal in 3-hexene-2,5-dione.

  14. Phytoremediation of 1,4-dioxane-containing recovered groundwater.

    Science.gov (United States)

    Ferro, Ari M; Kennedy, Jean; LaRue, James C

    2013-01-01

    The results of a pilot-scale phytoremediation study are reported in this paper. Small plots of trees established on a closed municipal waste landfill site were irrigated with recovered groundwater containing 1,4-dioxane (dioxane) and other volatile organic compounds (VOCs). The plots were managed to minimize the leaching of irrigation water, and leaching was quantified by the use of bromide tracer. Results indicated that the dioxane (2.5 microg/L) was effectively removed, probably via phytovolatilization, and that a full-scale phytoremediation system could be used. A system is now in place at the site in which the recovered groundwater can be treated using two different approaches. A physical treatment system (PTS) will be used during the winter months, and a 12 ha phytoremediation system (stands of coniferous trees) will be used during the growing season. The PTS removes VOCs using an air-stripper, and destroys dioxane using a photo-catalytic oxidation process. Treated water will be routed to the local sewer system. The phytoremediation system, located on the landfill, will be irrigated with effluent from the PTS air-stripper containing dioxane. Seasonal use of the phytoremediation system will reduce reliance on the photo-catalytic oxidation process that is extremely energy consumptive and expensive to operate.

  15. Installation Restoration Program Stage 3. Remedial Investigation/ Feasibility Study, Elmendorf AFB, Alaska. Volume 1. Sections 1-4, Text

    Science.gov (United States)

    1990-05-01

    They primarily hunted marine mammals including seals and beluga whales. Their language was regionally unique and communication with tribes from the...water flow. Landsurface elevation contour. HYDROGEOLOGIC MAP .- 300" Contour intervals: 25ft. SITE D-16 Geologic Cross Section wale table contour.gur

  16. Influence of dispersity on the activity, selectivity, and stability of Raney-Nickel catalyst during the hydrogenation of 1,4-butynediol into 1,4-butanediol

    Energy Technology Data Exchange (ETDEWEB)

    Rusina, S.V.; Litvin, E.F.; Kheifets, V.I.; Sharf, V.Z.

    1992-07-10

    Raney-nickel catalysts are widely used in the hydrogenation of 1,4-butynediol into 1,4-butanediol, an important intermediate for the preparation of thermostable resins, plasticizers, pharmaceutical preparations, and other compounds. The authors carried out the investigation of the influence of the dispersity of the Raney-nickel catalysts on their activity, selectivity, and stability in the hydrogenation reaction of 1,4-butynediol into 1,4-butanediol.

  17. Crystal structure of (μ-1,4-dicarboxybutane-1,4-dicarboxylatobis[bis(triphenylphosphanesilver(I] dichloromethane trisolvate

    Directory of Open Access Journals (Sweden)

    Peter Frenzel

    2016-02-01

    Full Text Available The molecular structure of the tetrakis(triphenylphosphanyldisilver salt of butane-1,1,4,4-tetracarboxylic acid, [Ag2(C8H8O8(C18H15P4]·3CH2Cl2, crystallizes with one and a half molecules of dichloromethane in the asymmetric unit. The coordination complex exhibits an inversion centre through the central CH2—CH2 bond. The AgI atom has a distorted trigonal–planar P2O coordination environment. The packing is characterized by intermolecular T-shaped π–π interactions between the phenyl rings of the PPh3 substituents in neighbouring molecules, forming a ladder-type superstructure parallel to [010]. These ladders are arranged in layers parallel to (101. Intramolecular hydrogen bonds between the OH group and one O atom of the Ag-bonded carboxylate group results in an asymmetric bidendate coordination of the carboxylate moiety to the AgI ion.

  18. {sup 1}4C Accelerator mass spectrometry in Brazil

    Energy Technology Data Exchange (ETDEWEB)

    Macario, K.D.; Gomes, P.R.S.; Anjos, Roberto M.; Linares, R.; Queiroz, E.A.; Oliveira, F.M.; Cardozo, L. [Universidade Federal Fluminense (UFF), Niteroi, RJ (Brazil). Inst. de Fisica; Carvalho, C.R.A. [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Inst. de Fisica

    2011-07-01

    Radiocarbon Accelerator Mass Spectrometry is an ultra-sensitive technique that enables the direct measurement of carbon isotopes in samples as small as a few milligrams. The possibility of dating or tracing rare or even compound specific carbon samples has application in many fields of science such as Archaeology, Geosciences and Biomedicine. Several kinds of material such as wood, charcoal, carbonate and bone can be chemically treated and converted to graphite to be measured in the accelerator system. The Physics Institute of Universidade Federal Fluminense (UFF), in Brazil will soon be able to perform the complete {sup 14}C-AMS measurement of samples. At the Nuclear Chronology Laboratory (LACRON) samples are prepared and converted to carbon dioxide. A stainless steel vacuum system was constructed for carbon dioxide purification and graphitization is performed in sealed tubes in a muffle oven. Graphite samples will be analyzed in a 250 kV Single Stage Accelerator produced by National Electrostatic Corporation which will be installed in the beginning of 2012. With the sample preparation laboratory at LACRON and the SSAMS system, the Physics Institute of UFF will be the first {sup 14}C-AMS facility in Latin America. (author)

  19. In-situ activation of persulfate by iron filings and degradation of 1,4-dioxane.

    Science.gov (United States)

    Zhong, Hua; Brusseau, Mark L; Wang, Yake; Yan, Ni; Quig, Lauren; Johnson, Gwynn R

    2015-10-15

    Activation of persulfate by iron filings and subsequent degradation of 1,4-dioxane (dioxane) was studied in both batch-reactor and column systems to evaluate the potential of a persulfate-enhanced permeable reactive barrier (PRB) system for combined oxidative-reductive removal of organic contaminants from groundwater. In batch experiments, decomposition of persulfate to sulfate and degradation of dioxane both occurred rapidly in the presence of iron filings. Conversely, dioxane degradation by persulfate was considerably slower in the absence of iron filings. For the column experiments, decomposition and retardation of persulfate was observed for transport in the columns packed with iron filings, whereas no decomposition or retardation was observed for transport in columns packed with a reference quartz sand. Both sulfate production and dioxane degradation were observed for the iron-filings columns, but not for the sand column. The pH of the column effluent increased temporarily before persulfate breakthrough, and significant increases in both ferrous and ferric iron coincided with persulfate breakthrough. Multiple species of free radicals were produced from persulfate activation as determined by electron paramagnetic resonance (EPR) spectroscopy. The impact of the oxidation process on solution composition and iron-filings surface chemistry was examined using ICP-MS, SEM-EDS, and XRD analyses. A two-stage reaction mechanism is proposed to describe the oxidation process, consisting of a first stage of rapid, solution-based, radical-driven decomposition of dioxane and a second stage governed by rate-limited surface reaction. The results of this study show successful persulfate activation using iron filings, and the potential to apply an enhanced PRB method for improving in-situ removal of organic contaminants from groundwater.

  20. LIP: The Livermore Interpolation Package, Version 1.4

    Energy Technology Data Exchange (ETDEWEB)

    Fritsch, F N

    2011-07-06

    to functions that interpolate or invert the interpolant at an arbitrary number of points. The first section of this report describes the overall design of the package, including both forward and inverse interpolation. Sections 2-6 describe each interpolation method in detail. The software that implements this design is summarized function-by-function in Section 7. For a complete example of package usage, refer to Section 8. The report concludes with a few brief notes on possible software enhancements. For guidance on adding other functional forms to LIP, refer to Appendix B. The reader who is primarily interested in using LIP to solve a problem should skim Section 1, then skip to Sections 7.1-4. Finally, jump ahead to Section 8 and study the example. The remaining sections can be referred to in case more details are desired. Changes since version 1.1 of this document include the new Section 3.2.1 that discusses derivative estimation and new Section 6 that discusses the birational interpolation method. Section numbers following the latter have been modified accordingly.

  1. Phosphorylation of the rat Ins(1,4,5)P₃ receptor at T930 within the coupling domain decreases its affinity to Ins(1,4,5)P₃.

    Science.gov (United States)

    Haun, Shirley; Sun, Lu; Hubrack, Satanay; Yule, David; Machaca, Khaled

    2012-01-01

    The Ins(1,4,5)P 3 receptor acts as a central hub for Ca ( 2+) signaling by integrating multiple signaling modalities into Ca ( 2+) release from intracellular stores downstream of G-protein and tyrosine kinase-coupled receptor stimulation. As such, the Ins(1,4,5)P 3 receptor plays fundamental roles in cellular physiology. The regulation of the Ins(1,4,5)P 3 receptor is complex and involves protein-protein interactions, post-translational modifications, allosteric modulation, and regulation of its sub-cellular distribution. Phosphorylation has been implicated in the sensitization of Ins(1,4,5)P 3-dependent Ca ( 2+) release observed during oocyte maturation. Here we investigate the role of phosphorylation at T-930, a residue phosphorylated specifically during meiosis. We show that a phosphomimetic mutation at T-930 of the rat Ins(1,4,5)P 3 receptor results in decreased Ins(1,4,5)P 3-dependent Ca ( 2+) release and lowers the Ins(1,4,5)P 3 binding affinity of the receptor. These data, coupled to the sensitization of Ins(1,4,5)P 3-dependent Ca ( 2+) release during meiosis, argue that phosphorylation within the coupling domain of the Ins(1,4,5)P 3 receptor acts in a combinatorial fashion to regulate Ins(1,4,5)P 3 receptor function.

  2. Catecholato complexes of cobalt and nickel with 1,4-disubstituted-1,4-diazabutadiens-1,3 and 1,2-bis(diphenylphosphino)ethane

    Indian Academy of Sciences (India)

    Michael P Bubnov; Irina A Teplova; Nikolay O Druzhkov; Georgy K Fukin; Anna V Cherkasova; Vladimir K Cherkasov

    2015-03-01

    Divalent cobalt and nickel form four-coordinate complexes with sterically hindered 3,6-di-tert-butylcatecholato dianion (3,6-DBCat) and neutral bidentate 1,4-disubstituted-1,4-diazabutadiens-1,3 (DAB). Structural study of (1,4-di-tert-butyl-1,4-diazabutadiene-1,3)(3,6-di-tert-butyl-catecolato)nickel and (1,4-bis-(2,6-di-iso-propylphenyl)-2,3-dimethyl-1,4-diazabutadiene-1,3)(3,6-di-tert-butyl-catecolato)cobalt indicates square-planar environment of metals. Chemical one-electron oxidation of nickel complexes proceeds through catecholate ligand and leads to o-semiquinonato adducts. EPR spectral parameters indicate preservation of square-planar configuration after oxidation. Complexes (DAB)M(Cat) (M = Ni, Co) undergo neutral ligand substitution reactions.

  3. Phase relation of LaFe11.6Si1.4 compounds annealed at different high-temperature and the magnetic property of LaFe11.6−CoSi1.4 compounds

    Indian Academy of Sciences (India)

    Xiang Chen; Yungui Chen; Yongbai Tang

    2012-04-01

    LaFe11.6Si1.4 compounds are annealed at different high temperatures from 1323 to 1623 K. The powder X-ray diffraction patterns show that large amount of NaZn13-type phase begins to be observed in LaFe11.6Si1.4 compound after being annealed at 1423 K for 5 h. In the temperature range from 1423 to 1523 K, the -Fe and LaFeSi phases rapidly decrease to form 1:13 phase. LaFeSi phase is rarely observed in the XRD pattern in the LaFe11.6Si1.4 compound annealed at 1523 K (5 h).With annealing temperature increasing to 1573 K and 1673 K, La5Si3 phase is detected, and there is a certain amount of LaFeSi phase when the annealing temperature is 1673 K. The amount of impurity phases in the LaFe11.6Si1.4 compound annealed by the two-stage annealing consisting of high temperature (>1523 K) and 1523 K is larger than that of the single stage annealing at 1523 K under the same time. According to the results of different high-temperature annealing, LaFe11.6−CoSi1.4 (0.1 ≤ ≤ 0.8) compounds are annealed at 1523 K (5 h). The main phase is NaZn13-type phase, and the impurity phase is a small amount of -Fe in LaFe11.6−CoSi1.4 compounds. With increase in Co content from = 0.1 to 0.8, the Curie temperature C, goes up from 207 to 285 K. The introduction of Co element weakens the itinerant electron metamagnetic transition, and also results in the change of magnetic transition type from first to second order at about = 0.5. The magnetic entropy change decreases from 19.94 to 4.57 J /kg K with increasing Co concentration at a low magnetic field of 0–2 T. But the magnetic hysteresis loss around C reduces remarkably from 26.2 J /kg for = 0.1 to 0 J /kg for = 0.8.

  4. A note on inextensible flows of partially and pseudo null curves in E_1^4

    OpenAIRE

    Yuzbasi, Zuhal Kucukarslan; Bektas, Mehmet

    2013-01-01

    In this paper, we study inextensible flows of partially null and pseudo null curves in E_1^4. We give neccessary and sufficent conditions for inextensible flows of partially null and pseudo null curves in E_1^4

  5. Cervical Cancer Stage IVA

    Science.gov (United States)

    ... historical Searches are case-insensitive Cervical Cancer Stage IVA Add to My Pictures View /Download : Small: 756x576 ... Large: 3150x2400 View Download Title: Cervical Cancer Stage IVA Description: Stage IVA cervical cancer; drawing and inset ...

  6. Stable Isotopic and Molecular Biological Tools to Validate Biodegradation of 1,4-Dioxane

    OpenAIRE

    2014-01-01

    1,4-Dioxane, a probable human carcinogen, is a heterocyclic ether increasingly found as a contaminant in water supplies. Recent studies have reported that 1,4-dioxane can be biodegraded by a variety of microorganisms, and bioremediation may be an effective strategy for 1,4-dioxane contaminated sites. However, reliable monitoring tools to validate biodegradation of 1,4-dioxane are still lacking. Molecular biological tools and stable isotope-based tools have been previously applied as diagno...

  7. 37 CFR 1.4 - Nature of correspondence and signature requirements.

    Science.gov (United States)

    2010-07-01

    ... 37 Patents, Trademarks, and Copyrights 1 2010-07-01 2010-07-01 false Nature of correspondence and signature requirements. 1.4 Section 1.4 Patents, Trademarks, and Copyrights UNITED STATES PATENT AND... General Information and Correspondence § 1.4 Nature of correspondence and signature requirements....

  8. Pectin Biosynthesis: GALS1 in Arabidopsis thaliana Is a β-1,4-Galactan β-1,4-Galactosyltransferase [C][W][OA

    DEFF Research Database (Denmark)

    Liwanag, April Jennifer Madrid; Ebert, Berit; Verhertbruggen, Yves

    2012-01-01

    β-1,4-Galactans are abundant polysaccharides in plant cell walls, which are generally found as side chains of rhamnogalacturonan I. Rhamnogalacturonan I is a major component of pectin with a backbone of alternating rhamnose and galacturonic acid residues and side chains that include α-1,5-arabinans......, β-1,4-galactans, and arabinogalactans. Many enzymes are required to synthesize pectin, but few have been identified. Pectin is most abundant in primary walls of expanding cells, but β-1,4-galactan is relatively abundant in secondary walls, especially in tension wood that forms in response...

  9. Pharmacological Characterization of Inositol 1,4,5-tris Phosphate Receptors in Human Platelet Membranes

    Directory of Open Access Journals (Sweden)

    Yogesh Dwivedi

    2009-01-01

    Full Text Available The phosphatidylinositol (PI hydrolysis signaling system has been shown to be altered in platelets of depressed and schizophrenic subjects. Inositol (1,4,5 trisphosphate (Ins(1,4,5P3, an integral component of the PI signaling system, mobilizes Ca2+ by activating Ins(1,4,5P3 receptors. To eventually investigate the role of Ins(1,4,5P3 receptors in depression and other mental disorders, we characterized [H3]Ins(1,4,5P3 binding sites in crude platelet membranes prepared from small amounts of blood obtained from healthy human control subjects. We found a single, saturable binding site for [H3]Ins(1,4,5P3 to crude platelet membranes, which is time dependent and modulated by pH, inositol phosphates, and heparin. Since cyclic adenosine monophosphate (cAMP and Ca2+ have been shown to be important modulators in Ins(1,4,5P3 receptors, in the present study we also determined the effects of various concentrations of CaCI2 and forskolin on Ins(1,4,5P3 binding to platelet membranes. CaCI2 modulated [3H]Ins(1,4,5P3 binding sites in a biphasic manner: at lower concentrations it inhibited [3H]Ins(1,4,5P3 binding, whereas at higher concentrations, it stimulated [3H]Ins(1,4,5P3 binding. On the other hand, forskolin inhibited [3H]Ins(1,4,5P3 binding. Our results thus suggest that the pharmacological characteristics of [3H]Ins(1,4,5P3 binding to crude platelet membranes are similar to that of Ins(1,4,5P3 receptors; and that both Ca2+ and cAMP modulate [3H]Ins(1,4,5P3 binding in crude platelet membranes.

  10. Explaining the Cyclic Voltammetry of a Poly(1,4-phenylene-ethynylene)-alt-poly(1,4-phenylene-vinylene) Copolymer upon Oxidation by using Spectroscopic Techniques.

    Science.gov (United States)

    Enengl, Christina; Enengl, Sandra; Bouguerra, Nassima; Havlicek, Marek; Neugebauer, Helmut; Egbe, Daniel A M

    2017-01-04

    Poly(1,4-phenylene-ethynylene)-alt-poly(1,4-phenylene-vinylene) (PPE-PPV) copolymers have attracted quite a lot of attention in the last few years for electronic device applications owing to their enhanced fluorescence. In this work, we focus on one particular PPE-PPV copolymer with dissymmetrically substituted 1,4-phenylene-ethynylene and symmetrically substituted 1,4-phenylene-vinylene building units. Six successively performed cyclic voltammograms are presented, measured during the oxidation reactions. As the oxidation onset of the electrochemical reaction shifts to lower potentials in each cycle, this behavior is elucidated by using spectroscopic techniques ranging from UV/Vis/near-IR to mid-IR including spin-resonance techniques. Hence, these findings help to explain some of the copolymer's most advantageous properties in terms of possible oxidation products.

  11. SYNTHESIS, CRYSTAL STRUCTURE, AND PROPERTIES OF COPPER(II COMPLEXES WITH 1,4,7-TRIS(2-AMINOETHYL-1,4,7-TRIAZACYCLONONANE

    Directory of Open Access Journals (Sweden)

    Masahiro Mikuriya

    2015-12-01

    Full Text Available Three kinds of copper(II complexes with 1,4,7-tris(2-aminoethyl-1,4,7-triazacyclononane (taetacn, [Cu(taetacn](ClO42 (1, [Cu(Htaetacn](ClO43 (2, and [Cu(Htaetacn](BF43 (3 were synthesized and characterized by elemental analyses, IR and UV-Vis spectroscopies. The spectral features are in harmony with an octahedral geometry for 1 and a square-pyramidal coordination for 2 and 3.

  12. Between Stage and Screen

    NARCIS (Netherlands)

    Tornqvist, Egil

    1996-01-01

    Ingmar Bergman is worldwide known as a film and stage director. Yet no-one has attempted to compare his stage and screen activities. In Between stage and screen Egil Tornqvist examines formal and thematical correspondences and differences between a number of Bergman's stage, screen, and radio produc

  13. Poly[[μ-1,4-bis(imidazol-1-ylmethylbenzene]bis(μ4-cyclohexane-1,4-dicarboxylatodinickel(II

    Directory of Open Access Journals (Sweden)

    Bing-Bing Li

    2009-08-01

    Full Text Available The structure of the polymeric title compound, [Ni2(C8H10O42(C14H14N4]n, features a five-coordinate NiII centre defined by four carboxylate O atoms from two different cyclohexane-1,4-dicarboxylate (chdc ligands and an N atom from one end of a 1,4-bis(imidazol-1-ylmethylbenzene (1,4-bix molecule. The NO4 coordination geometry is distorted square-pyramidal with the N atom in the apical position. Each end of the chdc ligand links pairs of NiII atoms into a paddle-wheel assembly, i.e. Ni2(O2CR′4. These are connected into rows owing to the bridging nature of the chdc ligands, and the rows are connected into a two-dimensional grid via the 1,4-bix ligands. The 1,4-bix ligand, which is disposed about a centre of inversion, is disorderd. Two positions of equal occupancy were discerned for the –H2C(C6H4CH2– residue.

  14. Poly[[μ2-1,4-bis(imidazol-1-ylmethylbenzene]bis(μ4-cyclohexane-1,4-dicarboxylatodicobalt(II

    Directory of Open Access Journals (Sweden)

    Qun-Di Yu

    2009-10-01

    Full Text Available In the title compound, [Co2(C8H10O42(C14H14N4]n, the two CoII atoms are both five-coordinated by four carboxylate O atoms, derived from two different cyclohexane-1,4-dicarboxylate (chdc ligands, and an N atom, derived from one end of a 1,4-bis(imidazol-1-ylmethylbenzene molecule (1,4-bix, in a distorted square-pyramidal environment. Each end of the chdc ligand links pairs of CoII atoms into a paddle-wheel assembly, i.e. Co2(O2CR′4; these are connected into rows because of the bridging nature of the chdc ligands, and the rows are further connected into a two-dimensional layer through the 1,4-bix ligands. The 1,4-bix ligand, which is disposed about a centre of inversion, is disorderd. Two positions were discerned for the –CH2(C6H4CH2– residue, with the major component having a site-occupancy factor of 0.512 (9.

  15. Electrochemical selenium- and iodonium-initiated cyclisation of hydroxy-functionalised 1,4-dienes

    Directory of Open Access Journals (Sweden)

    Philipp Röse

    2015-01-01

    Full Text Available The cobalt(I-catalysed 1,4-hydrovinylation reaction of allyloxytrimethylsilane and allyl alcohol with substituted 1,3-dienes leads to hydroxy-functionalised 1,4-dienes in excellent regio- and diastereoselective fashion. Those 1,4-dienols can be converted into tetrahydrofuran and pyran derivatives under indirect electrochemical conditions generating selenium or iodonium cations. The reactions proceed in good yields and regioselectivities for the formation of single diastereomers.

  16. Dynamical structure of space-time discontinuum and spin 1/4

    Energy Technology Data Exchange (ETDEWEB)

    Sannikov-Proskuryakov, S.S

    2001-09-01

    It seems that spin 1/4 was recently observed in so called deep inelastic scattering experiments. Apparently its explanation is not packed in the frame of quark-gluon model of elementary particles. However the new theory surely contains these objects with spin 1/4. Such objects appear if we consider our space-time at very small distances as a discontinuum. Thus, two things are connected: spin 1/4 and space-time discontinuum.

  17. Effects of Contact Geometry on Electron Transport of 1,4-Diaminobenzene

    Institute of Scientific and Technical Information of China (English)

    ZHENG Ji-Ming; REN Zhao-Yu; GUO Ping; TIAN Jin-Shou; BAI Jin-Tao

    2008-01-01

    @@ The equilibrium electron transport of 1,4-diaminobenzene sandwiched between two Au electrodes is simulated by using a first principles analysis. The results show that equilibrium conductance increases with the moleculeelectrode distance decreasing, and a platform occurs at the distance varying from 1.4 (A) to 1.9 (A), implying the insensitiveness of 1,4-diaminobenzene equilibrium conductance to molecule-electrode distance. This is helpful to understand the improved reliability and reproducibility of conductance measurements using amines.

  18. Biosynthesis and molecular actions of specialized 1,4-naphthoquinone natural products produced by horticultural plants

    Science.gov (United States)

    Widhalm, Joshua R; Rhodes, David

    2016-01-01

    The 1,4-naphthoquinones (1,4-NQs) are a diverse group of natural products found in every kingdom of life. Plants, including many horticultural species, collectively synthesize hundreds of specialized 1,4-NQs with ecological roles in plant–plant (allelopathy), plant–insect and plant–microbe interactions. Numerous horticultural plants producing 1,4-NQs have also served as sources of traditional medicines for hundreds of years. As a result, horticultural species have been at the forefront of many basic studies conducted to understand the metabolism and function of specialized plant 1,4-NQs. Several 1,4-NQ natural products derived from horticultural plants have also emerged as promising scaffolds for developing new drugs. In this review, the current understanding of the core metabolic pathways leading to plant 1,4-NQs is provided with additional emphasis on downstream natural products originating from horticultural species. An overview on the biochemical mechanisms of action, both from an ecological and pharmacological perspective, of 1,4-NQs derived from horticultural plants is also provided. In addition, future directions for improving basic knowledge about plant 1,4-NQ metabolism are discussed. PMID:27688890

  19. Biodegradation of 1,4-dioxane: effects of enzyme inducers and trichloroethylene.

    Science.gov (United States)

    Hand, Steven; Wang, Baixin; Chu, Kung-Hui

    2015-07-01

    1,4-Dioxane is a groundwater contaminant and probable human carcinogen. In this study, two well-studied degradative bacteria Mycobacterium vaccae JOB5 and Rhodococcus jostii RHA1 were examined for their 1,4-dioxane degradation ability in the presence and absence of its co-contaminant, trichloroethylene (TCE), under different oxygenase-expression conditions. These two strains were precultured with R2A broth (complex nutrient medium) before supplementation with propane or 1-butanol to induce the expression of different oxygenases. Both propane- and 1-butanol-induced JOB5 and RHA1 were able to degrade 1,4-dioxane, TCE, and mixtures of 1,4-dioxane/TCE. Complete degradation of 1,4-dioxane/TCE mixture was observed only in propane-induced strain JOB5. Inhibition was observed between 1,4-dioxane and TCE for all cells. Furthermore, product toxicity caused incomplete degradation of 1,4-dioxane by 1-butanol-induced JOB5. In general, the more TCE degraded, the greater extent of product toxicity cells experienced; however, susceptibility to product toxicity was found to be both strain- and inducer-dependent. The findings of this study provide fundamental basis for developing an effective in-situ remediation method for 1,4-dioxane-contaminated ground water and the first known study of 1,4-dioxane degradation by wild-type strain RHA1.

  20. Evaluation for the withdrawal syndrome from gamma-hydroxybutyric acid (GHB), gamma-butyrolactone (GBL), and 1,4-butanediol (1,4-BD) in different rat lines.

    Science.gov (United States)

    Quang, Lawrence S; Colombo, Giancarlo; Lobina, Carla; Maccioni, Paola; Orru, Alessandro; Gessa, Gian Luigi; Maher, Timothy J; Carai, Mauro A M

    2006-08-01

    A severe and life-threatening gamma-hydroxybutyric acid (GHB) withdrawal syndrome, clinically similar to the alcohol withdrawal syndrome, is increasingly being reported in GHB addicts. We investigated for the occurrence of withdrawal in Wistar and Sprague-Dawley rats, and in the selectively bred lines of GHB-sensitive (GHB-S) and Sardinian alcohol-preferring (sP) rats, following chronic administration of GHB, gamma-butyrolactone (GBL), and/or 1,4-butanediol (1,4-BD). Using validated rodent alcohol withdrawal scoring scales, little to no spontaneous or pharmacologically precipitated withdrawal effects were observed in Wistar, Sprague-Dawley, or GHB-S rats. Conversely, sP rats displayed both spontaneous and precipitated audiogenic seizures following abrupt cessation of chronic GHB or 1,4-BD administration and following pharmacological challenge with the GABA(B) receptor-selective antagonist, SCH 50911, respectively.

  1. Acute toxicity and withdrawal syndromes related to γ-hydroxybutyrate (GHB) and its analogues γ-butyrolactone (GBL) and 1,4-butanediol (1,4-BD).

    Science.gov (United States)

    Wood, David M; Brailsford, Alan D; Dargan, Paul I

    2011-01-01

    Gamma-hydroxybutyrate (GHB) has been used as a recreational drug since the 1990s and over the last few years there has been increasing use of its analogues gamma-butyrolactone (GBL) and to a lesser extent 1,4-butanediol (1,4BD). This review will summarize the literature on the pharmacology of these compounds; the patterns and management of acute toxicity associated with their use; and the clinical patterns of presentation and management of chronic dependency associated with GHB and its analogues.

  2. Cervical Cancer Stage IVB

    Science.gov (United States)

    ... of the body, such as the lymph nodes, lung, liver, intestine, or bone. Stage IVB cervical cancer. Topics/Categories: Anatomy -- Gynecologic Cancer Types -- Cervical Cancer Staging Type: Color, ...

  3. Stages of Adolescence

    Science.gov (United States)

    ... Español Text Size Email Print Share Stages of Adolescence Page Content Article Body Adolescence, these years from puberty to adulthood, may be roughly divided into three stages: early adolescence, generally ages eleven to fourteen; middle adolescence, ages ...

  4. Stages of Esophageal Cancer

    Science.gov (United States)

    ... stage 0 , abnormal cells are found in the mucosa or submucosa layer of the esophagus wall. These ... found. Stage IA : Cancer has formed in the mucosa or submucosa layer of the esophagus wall. The ...

  5. Dynamic Stage Design

    Institute of Scientific and Technical Information of China (English)

    Florian von Hofen[GER

    2013-01-01

    Concepts and methods for dynamic stage designs were introduced ranging from different ifelds of TV live shows, exhibitions and theatre performances, and a special emphasis was put on solution to the theatre stage design.

  6. Ages and Stages: Teen

    Science.gov (United States)

    ... Spread the Word Shop AAP Find a Pediatrician Ages & Stages Prenatal Baby Toddler Preschool Gradeschool Teen Dating & ... Safety School Substance Abuse Young Adult Healthy Children > Ages & Stages > Teen Teen Article Body Adolescence can be ...

  7. Breast cancer staging

    Science.gov (United States)

    ... this page: //medlineplus.gov/ency/patientinstructions/000911.htm Breast cancer staging To use the sharing features on this ... Once your health care team knows you have breast cancer , they will do more tests to stage it. ...

  8. Beyond Erikson's Eight Stages.

    Science.gov (United States)

    Whitney, Ruth

    1979-01-01

    Erik Erikson has described eight stages of the healthy personality. This essay offers a revised version of the eight stages. Although most individuals develop through the eight stages, each is personally unique because patterns of fluctuation between safety and growth differ from one individual to another. (Author)

  9. Ovarian Cancer Stage II

    Science.gov (United States)

    ... hyphen, e.g. -historical Searches are case-insensitive Ovarian Cancer Stage II Add to My Pictures View /Download : ... 1650x675 View Download Large: 3300x1350 View Download Title: Ovarian Cancer Stage II Description: Three-panel drawing of stage ...

  10. Ovarian Cancer Stage IIIC

    Science.gov (United States)

    ... hyphen, e.g. -historical Searches are case-insensitive Ovarian Cancer Stage IIIC Add to My Pictures View /Download : ... 1530x1350 View Download Large: 3060x2700 View Download Title: Ovarian Cancer Stage IIIC Description: Drawing of stage IIIC shows ...

  11. Ovarian Cancer Stage I

    Science.gov (United States)

    ... hyphen, e.g. -historical Searches are case-insensitive Ovarian Cancer Stage I Add to My Pictures View /Download : ... 1650x675 View Download Large: 3300x1350 View Download Title: Ovarian Cancer Stage I Description: Three-panel drawing of stage ...

  12. Ramsey numbers r(K1, 4, G) for all three-partite graphs G of order six%K1,4和六阶三部图的Ramsey数r(K1,4,G)

    Institute of Scientific and Technical Information of China (English)

    顾华; 宋洪雪; 刘向阳

    2004-01-01

    本文主要应用了组合分析的方法. 在对所有边任意地进行了红、蓝2种颜色着色的完全图KN中, 考察了完全图KN的顶点集中某点的邻域在红图或蓝图中所生成的子图的性质. 在Jayawardene和Rousseau (Ars Combinatoria, 2000, 163-173)的主要结果的启发下, 研究并确定了另一种常见的五阶图K1, 4对于所有无孤立点的六阶三部图G的Ramsey数r(K1, 4, G).%In this paper, we use a combinatorial analysis method. In the complete graph KN with edges colored arbitrarily by red or blue, we consider the proposition of the subgraph of the red graph or blue graph induced by the neighborhood of some vertex in V(KN). Inspired by the main results of Jayawardene and Rousseau (Ars Combinatoria, 2000, 163-173), we determine the Ramsey numbers of r(K1, 4, G), where G is the three-partite graph of order six without isolate vertex.

  13. 26 CFR 1.4-4 - Short taxable year caused by death.

    Science.gov (United States)

    2010-04-01

    ... 26 Internal Revenue 1 2010-04-01 2010-04-01 true Short taxable year caused by death. 1.4-4 Section... Normal Taxes and Surtaxes § 1.4-4 Short taxable year caused by death. An individual making a return for a... results from the death of the taxpayer. Tax on Corporations...

  14. Biocatalytic Synthesis of Highly Enantiopure 1,4-Benzodioxane-2-carboxylic Acid and Amide

    Institute of Scientific and Technical Information of China (English)

    LIU Jun; WANG De-Xian; ZHENG Qi-Yu; WANG Mei-Xiang

    2006-01-01

    Catalyzed by Rhodococcus erythropolis A J270, a nitrile hydratase and amidase containing microbial whole-cell catalyst, at 10 ℃ and with the use of methanol as a co-solvent, nitrile and amide biotransformations produce 2S-1,4-benzodioxane-2-carboxamide and 2R-1,4-benzodioxane-2-carboxylic acid in high yields with excellent enantioselectivity.

  15. 10 CFR 960.3-1-4-3 - Site recommendation for characterization.

    Science.gov (United States)

    2010-01-01

    ... 10 Energy 4 2010-01-01 2010-01-01 false Site recommendation for characterization. 960.3-1-4-3... POTENTIAL SITES FOR A NUCLEAR WASTE REPOSITORY Implementation Guidelines § 960.3-1-4-3 Site recommendation for characterization. The evidence required to support the recommendation of a site as a...

  16. Rhodium-catalysed arylative annulation of 1,4-enynes with arylboronic acids.

    Science.gov (United States)

    Matsuda, Takanori; Watanuki, Shoichi

    2015-01-21

    The rhodium(I)-catalysed arylative annulation of 1,4-enynes with arylboronic acids was investigated. The reaction was found to proceed via an addition-1,4-rhodium migration-addition sequence, affording the corresponding 1,1-disubstituted 3-(arylmethylene)indanes.

  17. 10 CFR 960.3-1-4-2 - Site nomination for characterization.

    Science.gov (United States)

    2010-01-01

    ... 10 Energy 4 2010-01-01 2010-01-01 false Site nomination for characterization. 960.3-1-4-2 Section 960.3-1-4-2 Energy DEPARTMENT OF ENERGY GENERAL GUIDELINES FOR THE PRELIMINARY SCREENING OF POTENTIAL... characterization. The evidence required to support the nomination of a site as suitable for characterization...

  18. Syntheses of 3,7-disubstitrted 1,4-benzepin-2-one

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    A series of 3-methoxycarbonylpropoxy-7-(imidazol-4-ylpropinamide)-1, 3-dihydrogen-1-methyl-5-phenyl-2H-1, 4-benzodiazepin-2-ones, as farnesyltransferase(Ftase) inhibitors, were synthesized. The preparation of the key intermediate, 7-amino-3-methoxycabonylpropoxy-1- methyl-5-phenyl-2H-1,4-benzodiazepin-2-one, was improved.

  19. Solid-phase organic synthesis of 2-tridecanyl-1,4-naphthoquinone and 2-tridecanyl-1,4-naphthodiol that form redox-active micelles and vesicles.

    Science.gov (United States)

    Bugarin, Alejandro; Martinez, Luis E; Cooke, Peter; Islam, Tadiqul; Noveron, Juan C

    2014-10-01

    The solid-phase synthesis of new amphiphilic compounds is reported. It is based on a newly designed 1,4-naphthoquinone derivative that contains polar and nonpolar groups and self-assembles into micelles or vesicles in water depending on the concentration. They also display redox-active properties.

  20. Synthesis and Crystal Structure of N-[1-(4-Chlorophenyl)-1,4-dihydro-4-oxe-6-methylpyridazine-3-carbonyl]-N'-benzoylhydrazine

    Institute of Scientific and Technical Information of China (English)

    邹霞娟; 翁林红; 金桂玉; 王宏根

    2001-01-01

    The title compound N-[1-(4-chlorophenyl)-1,4-dihydro-4-oxe-6-methylpyridazine-3-carbonyl]-N'-benzoylhydrazine was prepared by the reaction of 1-(4-chlorophenyl)-1,4-dihydro-4-oxe-6-methylpyridazine-3-carboxylic acid with chloroformate ethyl ester and benzoyl hydrazine in the presence of triethylamine. The crystal structure The crystal is monoclinic, space group P2t/c, with unit cell parameters a=13.296(3),b=17.155(3), c=17.459(3)A, β=98.959(4), Z=4, V=3934(1) A3, Dc=1.371g/cm3, F(000)=1688,μ (MoKa)=0.226 mm-1, R=0.0495, wR=0.1348 for 3345 observed reflections (Ⅰ>2 σ(Ⅰ)). The hydrogen bonsd N(3)-H…O(1),N(7)-H…O(4),and N(8)-H…O(2)can be observed.

  1. 1.4—nm Intergrade Mineral in Soils of Subtropical China: A Review

    Institute of Scientific and Technical Information of China (English)

    HEJI-ZHENG; XUFENG-LIN; 等

    1995-01-01

    This paper is a review of some advances in the studies on 1.4-nm intergrade mineral of soils in subtropical China.1)1.4-nm intergrade mineral occurs ubiquitously in soils of subtropical China.The 1.4-nm mineral in red soil and yellow soil is mainly 1.4-nm intergrade mineral,and in acidic yellow-brown soil(pH<5.5) is vermiculite alone or 1.4-nm intergrade mineral together with vermiculite,The dstribution and the corresponding soils in horizontal zone.2) The interlayer material of 1.4-nm intergrade mineral in these soils appears to be hydroxy-Al polymers instead of hydroxy-Fe,proto-imogolite or kaolin-like material.There is a significant positive correlation between Al amount extracted from the soil with sodium citrate after DCB extraction and pH value of the citrate solution after the extraction.The citrate can also extract a certain amount of silicom from the soil,but the silicon may not come from interlayer of 1.4-nm intergrade mineral.3)It was seldom studied that either vermiculite or smectite did the natural 1.4-nm intergrade mineral come from in soil.or it was commonly thought to come from vermiculity,A recent report has revealed that if can come from smectite,There are some different behaviors between the 1.4-nm intergrade mineral derived from vermiculite and that from smectite,For example,they exert different influences on the formation of gibbsite.The 1.4-nm intergrade mineral derived from smectite may promote the formation of gibbsite in the yellow soil.4) The type of 1.4-nm minerals in soils.i.e.,vermiculite or .1.4nm intergrade mineral,may be significant to soil properties,such as soil acidity,exchangeable Al,electric charge amount and specific surface area.Therefore,the management for the soil in which 1.4-nm mineral is mainlay 1.4-nm intergrade mineral or vermiculte should be dealt with differently..

  2. Second stage of labor.

    Science.gov (United States)

    Cheng, Yvonne W; Caughey, Aaron B

    2015-06-01

    Current American College of Obstetricians and Gynecologists' definition of prolonged second stage diagnoses 10% to 14% of nulliparous and 3% to 3.5% of multiparous women as having a prolonged second stage. The progression of labor in modern obstetrics may have deviated from the current labor norms established in the 1950s, likely due to differences in obstetric population characteristics and variation in clinical practice. Optimal management of the second stage in women with and without epidural remains debatable. Although prolonged second stage is associated with increased risk of maternal morbidity, conflicting data exist regarding the duration of second stage and associated neonatal morbidity and mortality.

  3. Characterization of Cu1.4Te Thin Films for CdTe Solar Cells

    Directory of Open Access Journals (Sweden)

    Guangcan Luo

    2014-01-01

    Full Text Available The copper telluride thin films were prepared by a coevaporation technique. The single-phase Cu1.4Te thin films could be obtained after annealing, and annealing temperature higher than 220°C could induce the presence of cuprous telluride coexisting phase. Cu1.4Te thin films also demonstrate the high carrier concentration and high reflectance for potential photovoltaic applications from the UV-visible-IR transmittance and reflectance spectra, and Hall measurements. With contacts such as Cu1.4Te and Cu1.4Te/CuTe, cell efficiencies comparable to those with conventional back contacts have been achieved. Temperature cycle tests show that the Cu1.4Te contact buffer has also improved cell stability.

  4. Recent development in [1,4]benzodiazepines as potent anticancer agents: a review.

    Science.gov (United States)

    Gill, Rupinder Kaur; Kaushik, Shiv Om; Chugh, Jasreen; Bansal, Sumit; Shah, Anamik; Bariwal, Jitender

    2014-01-01

    The [1,4]benzodiazepine is an important class of heterocyclic compounds and clinically used for many ailments in humans. The [1,4]benzodiazepine has unique structure that mimics the peptide linkage. This interesting observation completely shifted the interest of medicinal chemist for [1,4]benzodiazepine from CNS acting drugs to anticancer agents. During last few decades, a large number of reports have appeared in the literature highlighting the anticancer activity of [1,4]benzodiazepines. Here, in this article, we have discussed the brief synthesis, origin of [1,4]benzodiazepines as anticancer agent, their mechanism of action and latest developments in this field. We have compiled the most important literature reports from last few decades till date.

  5. Cetuximab, Cisplatin, and Radiation Therapy in Treating Patients With Stage IB, Stage II, Stage III, or Stage IVA Cervical Cancer

    Science.gov (United States)

    2014-12-29

    Cervical Adenocarcinoma; Cervical Adenosquamous Carcinoma; Cervical Small Cell Carcinoma; Cervical Squamous Cell Carcinoma; Stage IB Cervical Cancer; Stage IIA Cervical Cancer; Stage IIB Cervical Cancer; Stage III Cervical Cancer; Stage IVA Cervical Cancer

  6. β-1,3 : 1,4-Glucan Synthase Activity in Rice Seedlings under Water

    Science.gov (United States)

    Kimpara, Tomoya; Aohara, Tsutomu; Soga, Kouichi; Wakabayashi, Kazuyuki; Hoson, Takayuki; Tsumuraya, Yoichi; Kotake, Toshihisa

    2008-01-01

    Background and Aims The metabolism of β-1,3 : 1,4-glucan regulates the mechanical properties of cell walls, and thereby changes the elongation growth of Poaceae plants. A previous study has shown that elongation growth of rice coleoptiles under water is enhanced by increased activity of β-1,3 : 1,4-glucan hydrolases; however, the involvement of β-1,3 : 1,4-glucan synthase activity in elongation growth under water has not yet been clarified. Methods The β-1,3 : 1,4-glucan synthase activity in a microsomal fraction prepared from rice seedlings grown under water was compared with that from control seedlings grown in air. The change under water in the relative expression level of CslF6, a major isoform of the β-1,3 : 1,4-glucan synthase genes, was examined by quantitative reverse-transcriptase PCR. Key Results The level of β-1,3 : 1,4-glucan synthase activity in submerged seedlings decreased to less than 40 % of that of the control seedlings and was accompanied by a significant reduction in the amount of β-1,3 : 1,4-glucan in the cell walls. Under water, the expression of CslF6 was reduced to less than 20 % of the unsubmerged control. Bubble aeration partially restored both β-1,3 : 1,4-glucan synthase activity and the expression of CslF6 under water, correlating with suppression of the submergence-induced elongation growth of coleoptiles. Conclusions Submergence down-regulates the expression of the CslF6 gene, leading to a decreased level of β-1,3 : 1,4-glucan synthase activity. Together with the increased activity of β-1,3 : 1,4-glucan hydrolases, the decreased activity of β-1,3 : 1,4-glucan synthase contributes to the decrease in the amount of β-1,3 : 1,4-glucan in the cell walls under water. The suppression of β-1,3 : 1,4-glucan synthesis under water may be mainly due to oxygen depletion. PMID:18487614

  7. Fate of 1,4-dioxane in the aquatic environment: from sewage to drinking water.

    Science.gov (United States)

    Stepien, Daria K; Diehl, Peter; Helm, Johanna; Thoms, Alina; Püttmann, Wilhelm

    2014-01-01

    Potential health effects of 1,4-dioxane and the limited data on its occurrence in the water cycle command for more research. In the current study, mobility and persistence of 1,4-dioxane in the sewage-, surface-, and drinking water was investigated. The occurrence of 1,4-dioxane was determined in wastewater samples from four domestic sewage treatment plants (STP). The influent and effluent samples were collected during weekly campaigns. The average influent concentrations in all four plants ranged from 262 ± 32 ng L(-1) to 834 ± 480 ng L(-1), whereas the average effluent concentrations were between 267 ± 35 ng L(-1) and 62,260 ± 36,000 ng L(-1). No removal of 1,4-dioxane during water treatment was observed. Owing to its strong internal chemical bonding, 1,4-dioxane is considered non-biodegradable under conventional bio-treatment technologies. The source of increased 1,4-dioxane concentrations in the effluents was identified to originate from impurities in the methanol used in the postanoxic denitrification process in one of the STPs. In view of poor biodegradation in STPs, surface water samples were collected to establish an extent of 1,4-dioxane pollution. Spatial and temporal distribution of 1,4-dioxane in the Rivers Main, Rhine, and Oder was examined. Concentrations reaching 2200 ng L(-1) in the Oder River, and 860 ng L(-1) in both Main and Rhine River were detected. The average monthly load of 1,4-dioxane in the Rhine River was calculated to equal to 172 kg d(-1). In all rivers, concentration of 1,4-dioxane increased with distance from the spring and was found to negatively correlate with the discharge of the river. Additionally, bank filtration and drinking water samples from two drinking water facilities were analyzed for the presence of 1,4-dioxane. The raw water contained 650 ng L(-1)-670 ng L(-1) of 1,4-dioxane, whereas the concentration in the drinking water fell only to 600 ng L(-1) and 490 ng L(-1), respectively. Neither of the purification

  8. Antimicrobial activity of 1,4-naphthoquinones by metal complexation Atividade antimicrobiana de 1,4-naftoquinonas por complexação com metais

    Directory of Open Access Journals (Sweden)

    Adriano Brandelli

    2004-06-01

    Full Text Available The effect of metal complexation on the antimicrobial activity of 1,4-naphthoquinones was investigated. Nickel-, chromium-, iron-, copper-, and cobalt-containing metal chelates of 5-amino-8-hydroxy-1,4-naphtoquinone (2 and its acyl-derivatives (3-8 were synthesized and characterized, and their antimicrobial activity was evaluated. Data from infrared spectroscopy indicate that naphthoquinones coordinate through oxygen and nitrogen atoms for 2, and through oxygen atoms when ligands were acyl derivatives 3-8. Susceptibility tests for antimicrobial activity showed that 2 and its acyl derivatives were effective on inhibiting the growth of pathogenic bacteria such as Staphylococcus aureus, Streptococcus uberis and Bacillus cereus, but not Gram-negative bacteria. The metal complexation often caused decrease of biological activity. Nickel complex of 2 was the most effective against Gram-positive bacteria, showing MIC values ranging from 375 to 1400 mg/ml. Metal chelates may be useful tools for the understanding of the antimicrobial mechanism of 1,4-naphthoquinones on these bacteria.O efeito da complexação com metais sobre a atividade antimicrobiana de 1,4-naftoquinonas foi investigado. Complexos contendo níquel, cromo, ferro, cobre e cobalto da 5-amino-8-hidroxi-1,4-naftoquinona (2 e seus acil-derivados (3-8 foram sintetizados e caracterizados e sua atividade antimicrobiana foi avaliada. Dados de espectroscopia de infravermelho indicaram que as naftoquinonas coordenam os metais através dos átomos de oxigênio e nitrogênio para 2 e através de átomos de oxigênio, quando os ligantes são os acil-derivados 3-8. Testes de sensibilidade antimicrobiana demonstraram que 2 e seus derivados foram efetivos na inibição do crescimento de bactérias patogênicas como Staphylococcus aureus, Streptococcus uberis e Bacillus cereus, mas não apresentaram efeito contra bactérias Gram-negativas. A complexação de metais geralmente causou diminuição da

  9. Staged electrostatic precipitator

    Science.gov (United States)

    Miller, Stanley J.; Almlie, Jay C.; Zhuang, Ye

    2016-03-01

    A device includes a chamber having an air inlet and an air outlet. The device includes a plurality of stages including at least a first stage adjacent a second stage. The plurality of stages are disposed in the chamber and each stage has a plurality of discharge electrodes disposed in an interior region and is bounded by an upstream baffle on an end proximate the air inlet and bounded by a downstream baffle on an end proximate the air outlet. Each stage has at least one sidewall between the upstream baffle and the downstream baffle. The sidewall is configured as a collection electrode and has a plurality of apertures disposed along a length between the upstream baffle and the downstream baffle. The upstream baffle of the first stage is positioned in staggered alignment relative to the upstream baffle of the second stage and the downstream baffle of the first stage are positioned in staggered alignment relative to the downstream baffle of the second stage.

  10. Metabolic Degradation of 1,4-dichloronaphthalene by Pseudomonas sp. HY

    Directory of Open Access Journals (Sweden)

    Jian Yu

    2015-08-01

    Full Text Available There is increasing concern regarding the adverse health effects of polychlorinated naphthalenes (PCNs. The metabolic degradation of 1,4-dichloronaphthalene (1,4-DCN as a model PCN, was studied using a strain of Pseudomonas sp. HY. The metabolites were analyzed by gas chromatography-mass spectrometry (GC-MS. A series of metabolites including dihydroxy-dichloro-naphthalene, epoxy-dichlorinated naphthalene, dichlorinated naphthol, and dichlorinated salicylic acid were identified. The time-concentration plots of the degradation curves of 1,4-DCN was also obtained from the experiments, which set the initial concentration of 1,4-DCN to 10 mg/L and 20 mg/L, respectively. The results showed that 98% removal could be achieved within 48 h at an initial 1,4-DCN concentration of 10 mg/L. Nevertheless, it took 144 h to reach the same degradation efficiency at an initial concentration of 20 mg/L. The degradation of 1,4-DCN may not remove the chloride ions during the processes and the metabolites may not benefit the bacterial growth. The research suggests a metabolic pathway of 1,4-DCN, which is critical for the treatment of this compound through biological processes.

  11. Enhanced decomposition of 1,4-dioxane in water by ozonation under alkaline condition.

    Science.gov (United States)

    Tian, Gui-Peng; Wu, Qian-Yuan; Li, Ang; Wang, Wen-Long; Hu, Hong-Ying

    2014-01-01

    1,4-Dioxane is a probable human carcinogenic and refractory substance that is widely detected in aquatic environments. Traditional wastewater treatment processes, including activated sludge, cannot remove 1,4-dioxane. Removing 1,4-dioxane with a reaction kinetic constant of 0.32 L/(mol·s) by using ozone, a strong oxidant, is difficult. However, under alkaline environment, ozone generates a hydroxyl radical (•OH) that exhibits strong oxidative potential. Thus, the ozonation of 1,4-dioxane in water under different pH conditions was investigated in this study. In neutral solution, with an inlet ozone feed rate of 0.19 mmol/(L·min), the removal efficiency of 1,4-dioxane was 7.6% at 0.5 h, whereas that in alkaline solution was higher (16.3-94.5%) within a pH range of 9-12. However, the removal efficiency of dissolved organic carbon was considerably lower than that of 1,4-dioxane. This result indicates that several persistent intermediates were generated during 1,4-dioxane ozonation. The pseudo first-order reaction further depicted the reaction of 1,4-dioxane. The obvious kinetic constants (kobs) at pH 9, 10, 11 and 12 were 0.94, 2.41, 24.88 and 2610 L/(mol·s), respectively. Scavenger experiments on radical species indicated that •OH played a key role in removing 1,4-dioxane during ozonation under alkaline condition.

  12. 1,4-Benzodiazepine drugs adsorption on the Ag colloidal surface

    Science.gov (United States)

    Cîntã, S.; Iliescu, T.; Astilean, S.; David, L.; Cozar, O.; Kiefer, W.

    1999-05-01

    The adsorption behaviour in the SERS complex of diazepam (7-chloro-1-methyl-5-phenyl-3-dihydro-1,4-benzodiazepin-2-one) and nitrazepam (1,3-dihydro-7-nitro-5-phenyl-1,4-benzodiazepin-2-one) with the Ag colloidal particles is reported and discussed. In both cases, the CN bond vibration of the 1,4-benzodiazepine is strongly affected by adsorption and enhanced. The SERS system of Ag colloid with diazepam or nitrazepam allow the recognition of the drug sample at concentration of 10 -7 mol l -1.

  13. Hydrogen consentration meter utilizing a diffusion tube composed of 2 1/4 C r

    Science.gov (United States)

    Roy, Prodyot; Sandusky, David W.; Hartle, Robert T.

    1979-01-01

    A diffusion tube hydrogen meter for improving the sensitivity and response time for the measurement of hydrogen in liquid sodium. The improved hydrogen meter has a composite membrane composed of pure nickel sleeve fitted, for example, over a 2 1/4 Cr-1 Mo steel or niobium diffusion tube. Since the hydrogen permeation rate through 2 1/4 Cr-1 Mo steels is a factor of four higher than pure nickel, and the permeation rate of hydrogen through niobium is two orders of magnitude greater than the 2 1/4 Cr-1 Mo steel, this results in a decrease in response time and an increase in the sensitivity.

  14. Crystal structure of dimethyl 2,5-bis-[(di-phen-oxy-phosphor-yl)-oxy]cyclo-hexa-1,4-diene-1,4-di-carboxyl-ate.

    Science.gov (United States)

    Gao, Lei; Ma, Zongshan; Yan, Hong

    2015-06-01

    In the title compound, C34H30O12P2, which was synthesized via the esterification of dimethyl 2,5-dioxo-1,4-cyclo-hexa-nedi-carboxyl-ate with diphenyl chloro-phosphate, the mol-ecule has crystallographic inversion symmetry. The dihedral angles between the plane of the cyclo-hexa-1,4-diene ring and those of the two benzene rings of the substituent phosphate groups are 41.0 (1) and 89.5 (1)°, while that with the ester group is 3.1 (3)°. In the crystal, only weak inter-molecular C-H⋯O hydrogen bonds are present.

  15. 1H NMR spectra of N-methyl-4-tolyl-1-(4-bromonaphthylamine and N-phenyl-1-(4-bromonaphthylamine: a combined experimental and theoretical study

    Directory of Open Access Journals (Sweden)

    Sergiy I. Okovytyy

    2014-03-01

    Full Text Available Theoretical investigations of the conformational properties and 1H NMR chemical shifts for N-methyl-4-tolyl-1-(4-bromonaphthylamine and N-phenyl-1-(4-bromonaphthylamine are reported. The calculations were performed at the DFT level (PBE1PBE functional using magnetically consistent 6-31G## and STO##-3Gmag basis sets. Conformational properties of the amines were studied using potential energy surface scanning. Chemical shifts were calculated using the GIAO and CSGT methods and averaged in proportion to the population of the corresponding conformations. Solvent effects (CDCl3 were accounted via PCM method. The obtained results allowed to assign the 1H NMR signals for the naphthalene moiety, which could not be done based on the experimental data alone.

  16. catena-Poly[[[tetra-aqua-magnesium]-trans-μ-[(piperazine-1,4-diium-1,4-di-yl)bis-(methyl-ene)]di-phospho-nato] hemihydrate].

    Science.gov (United States)

    Schilling, Lars-Hendrik; Stock, Norbert

    2013-01-01

    The structure of the title polymer, }[Mg(C6H14N2O6P2)(H2O)4]·0.5H2O} n , is based on centrosymmetric MgO6 octahedra, which are linked by [(piperazine-1,4-diium-1,4-di-yl)bis-(methyl-ene)]di-phospho-nate ligands, forming chains parallel to [1-1-1]. These chains are connected via hydrogen bonds primarily formed between the phospho-nate groups and water mol-ecules. The latter constitute four of the corners of the MgO6 polyhedra and bind to the O atoms of the phospho-nate groups of neighbouring chains. The lattice water molecule is disordered around an inversion centre, exhibiting an occupancy of 0.25.

  17. Staging Mobilities / Designing Mobilities

    DEFF Research Database (Denmark)

    Jensen, Ole B.

    2015-01-01

    In recent years, urban research has taken a ‘mobilities turn’. There has been a developing realisation that mobilities do not ‘just happen.’ Mobilities are carefully and meticulously designed, planned and staged (from above). However, they are equally importantly acted out, performed and lived...... as people are ‘staging themselves’ (from below). Staging mobilities is a dynamic process between ‘being staged’ (for example, being stopped at traffic lights) and the ‘mobile staging’ of interacting individuals (negotiating a passage on the pavement). Staging mobilities is about the fact that mobility...... asks: what are the physical, social, technical, and cultural conditions to the staging of contemporary urban mobilities? The theoretical framing in the Staging mobilities book is applied to four in-depth cases in the accompanying volume Designing mobilities.This book explore how places, sites...

  18. 1,4-丁二醇生产技术进展%Progress in Production Technology of 1,4-Butanediol

    Institute of Scientific and Technical Information of China (English)

    王俐

    2001-01-01

    @@ 1,4-丁二醇(BDO)除作为生产四氢呋喃(THF)和γ-丁内酯(GBL)的原料外,主要用于生产聚对苯二甲酸丁二醇酯(PBT).近年来,该领域涌现出大量新工艺和新的生产厂商.

  19. Synthesis and crystallographic analysis of meso-2,3-difluoro-1,4-butanediol and meso-1,4-dibenzyloxy-2,3-difluorobutane

    Directory of Open Access Journals (Sweden)

    Bruno Linclau

    2010-06-01

    Full Text Available A large-scale synthesis of meso-2,3-difluoro-1,4-butanediol in 5 steps from (Z-but-2-enediol is described. Crystallographic analysis of the diol and the corresponding benzyl ether reveals an anti conformation of the vicinal difluoride moiety. Monosilylation of the diol is high-yielding but all attempts to achieve chain extension through addition of alkyl Grignard and acetylide nucleophiles failed.

  20. Compatibility study of trans-1,4,5,8-tetranitro-1,4,5,8-tetraazadecalin (TNAD) with some energetic components and inert materials.

    Science.gov (United States)

    Yan, Qi-Long; Xiao-Jiang, Li; La-Ying, Zhang; Ji-Zhen, Li; Hong-Li, Li; Zi-Ru, Liu

    2008-12-30

    The compatibility of trans-1,4,5,8-tetranitro-1,4,5,8-tetraazadecalin (TNAD) with some energetic components and inert materials of solid propellants was studied by using the pressure DSC method where, cyclotetramethylenetetranitroamine (HMX), cyclotrimethylenetrinitramine (RDX), 1,4-dinitropiperazine (DNP), 1.25/1-NC/NG mixture, lead 3-nitro-1,2,4-triazol-5-onate (NTO-Pb), aluminum powder (Al, particle size=13.6microm) and N-nitrodihydroxyethylaminedinitrate (DINA) were used as energetic components and polyethylene glycol (PEG), polyoxytetramethylene-co-oxyethylene (PET), addition product of hexamethylene diisocyanate and water (N-100), 2-nitrodianiline (2-NDPA), 1,3-dimethyl-1,3-diphenyl urea (C2), carbon black (C.B.), aluminum oxide (Al2O3), cupric 2,4-dihydroxy-benzoate (beta-Cu), cupric adipate (AD-Cu) and lead phthalate (phi-Pb) were used as inert materials. It was concluded that the binary systems of TNAD with NTO-Pb, RDX, PET and Al powder are compatible, and systems of TNAD with DINA and HMX are slightly sensitive, and with 2-NDPA, phi-Pb, beta-Cu, AD-Cu and Al2O3 are sensitive, and with PEG, N-100, C2 and C.B. are incompatible. The impact and friction sensitivity data of the TNAD and TNAD in combination with the other energetic materials under present study was also obtained, and there was no consequential affiliation between sensitivity and compatibility.

  1. 二部图的K1,4-因子分解%K1,4-factorization of bipartite graphs

    Institute of Scientific and Technical Information of China (English)

    王建

    2001-01-01

    Km,n的K1,k-因子分解问题已被多位研究者所研究,当k=2时Km,n具有K1,2-因子分解的存在性问题已被Ushio完全解决.当k=3时Wang研究了Km,n的K1,3-因子分解问题,并给出了Km,n具有K1,3-因子分解的一个充分条件.本文研究Km,n的K1,4-因子分解问题,并给出Km,n具有K1,4-因子分解的一个充分条件.%The K1,k-factorization of complete bipartite graph Km,n has been studied by severalresearchers. When k = 2 , the spectum problem for K1,2-factorization of Km,n has been com-pletely solved by Ushio. When k=3, Wang investigated K1,3-factorization of Km, n and gavea sufficient condition for such a factorization to exist. In this paper, we investigate K1,4-fac-torization of Km, n, and give a sufficient condition for such a factorization to exist.

  2. An orthorhombic polymorph of N1,N4-diphenyl-3,6-bis(phenyliminocyclohexa-1,4-diene-1,4-diamine

    Directory of Open Access Journals (Sweden)

    Keiji Ohno

    2014-04-01

    Full Text Available A new orthorhombic polymorph of the title compound, C30H24N4, with a density of 1.315 Mg m−3, has been obtained. The molecule is centrosymmetric with the centroid of the cyclohexa-1,4-diene ring located on an inversion center. The two unique benzene rings are almost perpendicular to each other [dihedral angle = 86.70 (6°] and are oriented at dihedral angles of 30.79 (5 and 68.07 (5° with respect to the central cyclohexadiene ring. In the crystal, π–π stacking is observed between the central cyclohexa-1,4-diene-1,4-diamine unit and a phenyl ring of a neighboring molecule [centroid–centroid distance = 3.7043 (7 Å]. The crystal structure of the triclinic polymorph [Ohno et al. (2014. Acta Cryst. E70, o303–o304] showed chains running along the b-axis direction through weak C—H...π interactions.

  3. Distribution and variations of three 1,4-benzoxazin-3-ones in maize induced by the Asian corn borer, Ostrinia furnacalis (Guenée).

    Science.gov (United States)

    Huang, Cuihong; Wang, Xiaoying; Wang, Rongjiang; Xue, Kun; Yan, Fengming; Xu, Chongren

    2006-01-01

    Contents of three 1,4-benzoxazin-3-ones in tissue samples from different parts (young leaf, second leaf, old leaf, stem and root) of young maize plants of 4-leaves stage, fed by the third instar larvae of the Asian corn borer, Ostrinia furnacalis (Guenée), were analyzed by high-performance liquid chromatography-mass spectroscopy (HPLC-MS). Samples were taken immediately (set A) or 48 h (set B) after larvae had fed on the second leaf for 48 h. The three 1,4-benzoxazin-3-ones investigated in our experiments were 2,4-dihydroxy-7-methoxy-1,4(2H)-benzoxazin-3-one (DIMBOA), 2,4-dihydroxy-1,4(2H)-benzoxazin-3-one (DIBOA) and 2-hydroxy-7-methoxy-1,4(2H)-benzoxazin-3-one (HMBOA). In samples of set A, the levels of DIMBOA and HMBOA were significantly lifted in the old leaf (L3) and young leaf (L1), respectively, while amounts of these two chemicals in other plant parts were not significantly different between larvae-fed plants and intact plants. Concentrations of DIBOA in each plant part remained unchanged. In samples of set B, no concentration differences for any of these three 1,4-benzoxazin-3-ones between larvae-fed plants and controls were observed in any plant part. The feeding of the Asian corn borer seems to have limited effects on induction of these three 1,4-benzoxazin-3-ones in young maize plants of the variety investigated.

  4. Cytochrome P3-450 cDNA encodes aflatoxin B1-4-hydroxylase.

    Science.gov (United States)

    Faletto, M B; Koser, P L; Battula, N; Townsend, G K; Maccubbin, A E; Gelboin, H V; Gurtoo, H L

    1988-09-01

    Aflatoxin B1 (AFB1), a potent hepatocarcinogen and ubiquitous dietary contaminant in some countries, is detoxified to aflatoxin M1 (AFM1) via cytochrome P-450-mediated AFB1-4-hydroxylase. Genetic studies in mice have demonstrated that the expression of AFB1-4-hydroxylase is regulated by the aryl hydrocarbon locus and suggested that different cytochrome P-450 isozymes catalyze AFB1-4-hydroxylase and aryl hydrocarbon hydroxylase activities. We have now examined lysates from mammalian cells infected with recombinant vaccinia viruses containing expressible cytochrome P1-450 or P3-450 cDNAs for their ability to metabolize AFB1 to AFM1. Our results show that cytochrome P3-450 cDNA specifies AFB1-4-hydroxylase. This is the first direct assignment of a specific cytochrome P-450 to an AFB1 detoxification pathway. This finding may have relevance to the dietary modulation of AFB1 hepatocarcinogenesis.

  5. Synthesis of 2-Substituted Hexahydro-1H-1,4-diazepine Analogues

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    2-substituted hexahydro-1H-1,4-diazepine analogues were synthesized starting from N,N?-dibenzyl-1,3-propylene diamine and methyl-2,3-dibromo propionate through nucleophilic substitution, reduction, chlorination and debenzylation.

  6. Smoking Costs World $1.4 Trillion a Year in Disease, Lost Productivity

    Science.gov (United States)

    ... page: https://medlineplus.gov/news/fullstory_163313.html Smoking Costs World $1.4 Trillion a Year in ... the world's health-care spending is tied to smoking, a new study reports. That amounted to $1. ...

  7. Oxidative aromatization of Hantzsch 1,4-dihydropyridines by aqueous hydrogen peroxide-acetic acid

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    A simple method for the oxidative aromatization of Hantzsch 1,4-dihydropyridines to the corresponding pyridines is achieved by using hydrogen peroxide as green oxidant and acetic acid as catalyst in aqueous solution.

  8. Physiological and pathophysiological insights of Nav1.4 and Nav1.5 comparison

    Directory of Open Access Journals (Sweden)

    Gildas eLoussouarn

    2016-01-01

    Full Text Available Mutations in Nav1.4 and Nav1.5 α-subunits have been associated with muscular and cardiac channelopathies, respectively. Despite intense research on the structure and function of these channels, a lot of information is still missing to delineate the various physiological and pathophysiological processes underlying their activity at the molecular level. Nav1.4 and Nav1.5 sequences are similar, suggesting structural and functional homologies between the two orthologous channels. This also suggests that any characteristics described for one channel subunit may shed light on the properties of the counterpart channel subunit. In this review article, after a brief clinical description of the muscular and cardiac channelopathies related to Nav1.4 and Nav1.5 mutations, respectively, we compare the knowledge accumulated in different aspects of the expression and function of Nav1.4 and Nav1.5 α-subunits: the regulation of the two encoding genes (SCN4A and SCN5A, the associated/regulatory proteins and at last, the functional effect of the same missense mutations detected in Nav1.4 and Nav1.5. First, it appears that more is known on Nav1.5 expression and accessory proteins. Because of the high homologies of Nav1.5 binding sites and equivalent Nav1.4 sites, Nav1.5-related results may guide future investigations on Nav1.4. Second, the analysis of the same missense mutations in Nav1.4 and Nav1.5 revealed intriguing similarities regarding their effects on membrane excitability and alteration in channel biophysics. We believe that such comparison may bring new cues to the physiopathology of cardiac and muscular diseases.

  9. 26 CFR 1.4-3 - Husband and wife filing separate returns.

    Science.gov (United States)

    2010-04-01

    ... 26 Internal Revenue 1 2010-04-01 2010-04-01 true Husband and wife filing separate returns. 1.4-3... TAXES Normal Taxes and Surtaxes § 1.4-3 Husband and wife filing separate returns. (a) In general. If the... his wife is less than $5,000, and if each is required to file a return, the husband and the wife...

  10. Synthesis and Rearrangement of 3-Methyl-1,4-pentadiyne-3-ol

    Directory of Open Access Journals (Sweden)

    Werner Bonrath

    2002-03-01

    Full Text Available An efficient synthesis and rearrangement of 3-methyl-1,4-pentadiyne-3-ol (1 using perrhenate- and Mo(VI-catalysts is reported. The by-products 3,6-dimethyl-1,4,7-octatriyne-3,6-diol (2 and 3-ethynyl-5-methyl-1,6-heptadiyne-3,5-diol (3 were isolated and spectroscopically characterized. A possible reaction mechanism for the formation of the byproducts is discussed.

  11. Imaging B. anthracis heme catabolism in mice using the IFP1.4 gene reporter

    Science.gov (United States)

    Zhu, Banghe; Robinson, Holly; Wilganowski, Nathaniel; Nobles, Christopher L.; Sevick-Muraca, Eva; Maresso, Anthony

    2012-03-01

    B. anthracis is a gram-positive, spore-forming bacterium which likes all pathogenic bacteria, survive by sequestering heme from its host. To image B. anthracis heme catabolism in vivo, we stably transfect new red excitable fluorescent protein, IFP1.4, that requires the heme catabolism product biliverdin (BV). IFP1.4 reporter has favorable excitation and emission characteristics, which has an absorption peak at 685 nm and an emission peak at 708 nm. Therefore, IFP1.4 reporter can be imaged deeply into the tissue with less contamination from tissue autofluorescence. However, the excitation light "leakage" through optical filters can limit detection and sensitivity of IFP1.4 reporter due to the small Stoke's shift of IFP1.4 fluorescence. To minimize the excitation light leakage, an intensified CCD (ICCD) based infrared fluorescence imaging device was optimized using two band pass filters separated by a focus lens to increase the optical density at the excitation wavelength. In this study, a mouse model (DBA/J2) was first injected with B. anthracis bacteria expressing IFP1.4, 150 μl s.c., on the ventral side of the left thigh. Then mouse was given 250 μl of a 1mM BV solution via I.V. injection. Imaging was conducted as a function of time after infection under light euthanasia, excised tissues were imaged and IFP1.4 fluorescence correlated with standard culture measurements of colony forming units (CFU). The work demonstrates the use of IFP1.4 as a reporter of bacterial utilization of host heme and may provide an important tool for understanding the pathogenesis of bacterial infection and developing new anti-bacterial therapeutics.

  12. Anxiolytic-like effect of the monoterpene 1,4-cineole in mice.

    Science.gov (United States)

    Gomes, Patrícia Bezerra; Feitosa, Mariana Lima; Silva, Maria Izabel Gomes; Noronha, Emmanuelle Coelho; Moura, Brinell Arcanjo; Venâncio, Edith Teles; Rios, Emiliano Ricardo Vasconcelos; de Sousa, Damião Pergentino; de Vasconcelos, Silvânia Maria Mendes; Fonteles, Marta Maria de França; de Sousa, Francisca Cléa Florenço

    2010-09-01

    Recent studies have shown that some monoterpenes exert anxiolytic- and depressant-like actions, however, these effects from monoterpene 1,4-cineole are still unknown. This work aimed to study the effects of 1,4-cineole in classic animal models for depression- and anxiety-like behavior, specifically the elevated plus maze (EPM), hole board, open field, pentobarbital sleeping time, forced swimming, tail suspension and rota rod tests. 1,4-Cineole was administered orally to mice (100, 200 and 400 mg/kg), while diazepam (1 or 2 mg/kg) and imipramine (10 or 30 mg/kg) were used as standard drugs. 1,4-Cineole (400 mg/kg) modified all parameters observed in the EPM, while no significant variation was observed on general motor activity in the open-field test. In the hole-board assay, 1,4-cineole induced increase on the number of head dips. Forced swimming and tail suspension tests showed that cineole (200 and/or 400 mg/kg) was able to promote significant increase on the immobility time, while a decreased sleep latency was observed (200 and 400 mg/kg ) on the pentobarbital sleeping time. Cineole had no effect on the motor coordination of animals in the rota rod test. The results suggest that 1,4-cineole presents potential anxiolytic-like action consistent with possible general depression of the CNS.

  13. D-glucaro 1,4-lactone and resveratrol as antioxidants in blood platelets.

    Science.gov (United States)

    Olas, Beata; Saluk-Juszczak, Joanna; Wachowicz, Barbara

    2008-04-01

    The aim of our work was to study the anti-aggregatory and antioxidative effects of natural dietary products, D-glucaro 1,4-lactone (1,4-GL) in combination with phenolic compound resveratrol (trans-3,4',5-trihydroxystilbene). Our results in vitro showed that 1,4-GL alone slightly inhibits platelet aggregation induced by thrombin. The combination of resveratrol (0.1 microM) with 0.5 mM of 1,4-GL caused a significant decrease of thrombin-induced platelet aggregation; however separately, neither of studied compound at used concentrations was not effective. When platelets were treated with 1,4-GL (at the concentration of 0.1 mM and higher) and resveratrol (0.1 microM), similar synergistic action of both tested compound on markers of oxidative stress formation was observed. We measured the levels of different specific markers of oxidative stress, e.g., superoxide anion radicals O(2)(-)*, thiobarbituric acid-reactive substances and carbonyl group formation. Both tested compounds inhibited also the generation of O(2)(-)* and malondialdehyde that represents enzymatical peroxidation of arachidonic acid leading to thromboxane A(2) (TXA(2)) formation in platelets after thrombin stimulation. The obtained in vitro results demonstrate that anti-platelet and antioxidative properties of resveratrol may be significantly augmented by another dietary agent such as 1,4-GL, but mechanism synergistic action of these compounds is not yet known.

  14. Toxic effects of 1,4-dichlorobenzene on photosynthesis in Chlorella pyrenoidosa.

    Science.gov (United States)

    Zhang, Jinhua; Wang, Jie; Feng, Jia; Lv, Junping; Cai, Jin; Liu, Qi; Xie, Shulian

    2016-09-01

    1,4-Dichlorobenzene (1,4-DCB) is a common organic contaminant in water. To determine the effects of this contaminant on photosynthesis in the freshwater alga Chlorella pyrenoidosa, algal cells were treated with 1,4-DCB at different concentrations for various times, and their photosynthetic pigment contents and chlorophyll fluorescence traits were analyzed. The results showed that 1,4-DCB exerted toxic effects on photosynthesis in C. pyrenoidosa, especially at concentrations exceeding 10 mg/L. The inhibitory effects of 1,4-DCB were time- and concentration-dependent. After treatment with 1,4-DCB (≥10 mg/L), the contents of photosynthetic pigments decreased significantly, the photosystem II reaction center was irreversibly damaged, and the quantum yield of photosystem II decreased significantly. Also, there were sharp decreases in the efficiency of photosynthetic electron transport and energy conversion. Photosystem II became overloaded as the amount of excitation energy distributed to it increased. All of these events weakened the photochemical reaction, and ultimately led to serious inhibition of photosynthesis.

  15. An Update on the Synthesis of Pyrrolo[1,4]benzodiazepines

    Directory of Open Access Journals (Sweden)

    George Varvounis

    2016-01-01

    Full Text Available Pyrrolo[1,4]benzodiazepines are tricyclic compounds that are considered “privileged structures” since they possess a wide range of biological activities. The first encounter with these molecules was the isolation of anthramycin from cultures of Streptomyces, followed by determination of the X-ray crystal structure of the molecule and a study of its interaction with DNA. This opened up an intensive synthetic and biological study of the pyrrolo[2,1-c][1,4]benzodiazepines that has culminated in the development of the dimer SJG-136, at present in Phase II clinical trials. The synthetic efforts have brought to light some new synthetic methodology, while the contemporary work is focused on building trimeric pyrrolo[2,1-c][1,4]benzodiazepines linked together by various heterocyclic and aliphatic chains. It is the broad spectrum of biological activities of pyrrolo[1,2-a][1,4]benzodiazepines that has maintained the interest of researchers to date whereas several derivatives of the even less studied pyrrolo[1,2-d][1,4]benzodiazepines were found to be potent non-nucleoside HIV-1 reverse transcriptase inhibitors. The present review is an update on the synthesis of pyrrolo[2,1-c][1,4]benzodiazepines since the last major review of 2011, while the overview of the synthesis of the other two tricyclic isomers is comprehensive.

  16. 1,4-Dialkynylbutatrienes: synthesis, stability, and perspectives in the chemistry of carbo-benzenes.

    Science.gov (United States)

    Maraval, Valérie; Leroyer, Léo; Harano, Aya; Barthes, Cécile; Saquet, Alix; Duhayon, Carine; Shinmyozu, Teruo; Chauvin, Remi

    2011-04-26

    The π-electron-rich C(8)-conjugated sequence of 1,4-dialkynylbutatrienes is identified as a fragile and fascinating motif occurring in carbo-benzene derivatives, and in Diederich's 1,4-bis(arylethynyl)- or 1,4-bis(triisopropylsilylethynyl)butatriene "capped" representatives, in particular, in tetraalkynylbutatriene. The family of symmetrical 1,4-dialkynylbutatrienes (E-C≡C)RC=C=C=CR(C≡C-E) is extended to functional caps (E=H, CH(3), C≡CPh, CPh=CHBr, or CPh=CBr(2)) with non-alkynyl substituents at the sp(2) vertices (R=Ph or CF(3)). The targets were selected for their potential in appealing retrosynthetic routes to carbo-benzenes, in which the aromatic C(18) macrocycle would be directly generated by sequential metathesis or reductive coupling processes. The functional 1,4-dialkynylbutrienes were synthesized by either classical methods used for the preparation of generic butatrienes (R'Li/CuX-mediated reductive coupling of gem-dihaloenynes or SnCl(2)/HCl-mediated reduction of 3,6-dioxy-octa-1,4,7-triyne precursors). Their spectroscopic and electrochemical properties are compared and analyzed on the basis of the relative extent of total conjugation.

  17. An Update on the Synthesis of Pyrrolo[1,4]benzodiazepines.

    Science.gov (United States)

    Varvounis, George

    2016-01-28

    Pyrrolo[1,4]benzodiazepines are tricyclic compounds that are considered "privileged structures" since they possess a wide range of biological activities. The first encounter with these molecules was the isolation of anthramycin from cultures of Streptomyces, followed by determination of the X-ray crystal structure of the molecule and a study of its interaction with DNA. This opened up an intensive synthetic and biological study of the pyrrolo[2,1-c][1,4]benzodiazepines that has culminated in the development of the dimer SJG-136, at present in Phase II clinical trials. The synthetic efforts have brought to light some new synthetic methodology, while the contemporary work is focused on building trimeric pyrrolo[2,1-c][1,4]benzodiazepines linked together by various heterocyclic and aliphatic chains. It is the broad spectrum of biological activities of pyrrolo[1,2-a][1,4]benzodiazepines that has maintained the interest of researchers to date whereas several derivatives of the even less studied pyrrolo[1,2-d][1,4]benzodiazepines were found to be potent non-nucleoside HIV-1 reverse transcriptase inhibitors. The present review is an update on the synthesis of pyrrolo[2,1-c][1,4]benzodiazepines since the last major review of 2011, while the overview of the synthesis of the other two tricyclic isomers is comprehensive.

  18. Preliminary In-Flight Loads Analysis of In-Line Launch Vehicles using the VLOADS 1.4 Program

    Science.gov (United States)

    Graham, J. B.; Luz, P. L.

    1998-01-01

    To calculate structural loads of in-line launch vehicles for preliminary design, a very useful computer program is VLOADS 1.4. This software may also be used to calculate structural loads for upper stages and planetary transfer vehicles. Launch vehicle inputs such as aerodynamic coefficients, mass properties, propellants, engine thrusts, and performance data are compiled and analyzed by VLOADS to produce distributed shear loads, bending moments, axial forces, and vehicle line loads as a function of X-station along the vehicle's length. Interface loads, if any, and translational accelerations are also computed. The major strength of the software is that it enables quick turnaround analysis of structural loads for launch vehicles during the preliminary design stage of its development. This represents a significant improvement over the alternative-the time-consuming, and expensive chore of developing finite element models. VLOADS was developed as a Visual BASIC macro in a Microsoft Excel 5.0 work book on a Macintosh. VLOADS has also been implemented on a PC computer using Microsoft Excel 7.0a for Windows 95. VLOADS was developed in 1996, and the current version was released to COSMIC, NASA's Software Technology Transfer Center, in 1997. The program is a copyrighted work with all copyright vested in NASA.

  19. Multiple Stages 2

    DEFF Research Database (Denmark)

    Andreasen, John

    Multiple stages 2: theatrical futures, set design, community plays, cultural capitals, democracy & drama, WWII dramas, performance on adoption, promenade about emigration, qualities in political theatre, performance analysis, dramaturgical education, Toulmin Variations......Multiple stages 2: theatrical futures, set design, community plays, cultural capitals, democracy & drama, WWII dramas, performance on adoption, promenade about emigration, qualities in political theatre, performance analysis, dramaturgical education, Toulmin Variations...

  20. Antimicrobial activity of quinoxaline 1,4-dioxide with 2- and 3-substituted derivatives.

    Science.gov (United States)

    Vieira, Mónica; Pinheiro, Cátia; Fernandes, Rúben; Noronha, João Paulo; Prudêncio, Cristina

    2014-04-01

    Quinoxaline is a chemical compound that presents a structure that is similar to quinolone antibiotics. The present work reports the study of the antimicrobial activity of quinoxaline N,N-dioxide and some derivatives against bacterial and yeast strains. The compounds studied were quinoxaline-1,4-dioxide (QNX), 2-methylquinoxaline-1,4-dioxide (2MQNX), 2-methyl-3-benzoylquinoxaline-1,4-dioxide (2M3BenzoylQNX), 2-methyl-3-benzylquinoxaline-1,4-dioxide (2M3BQNX), 2-amino-3-cyanoquinoxaline-1,4-dioxide (2A3CQNX), 3-methyl-2-quinoxalinecarboxamide-1,4-dioxide (3M2QNXC), 2-hydroxyphenazine-N,N-dioxide (2HF) and 3-methyl-N-(2-methylphenyl)quinoxalinecarboxamide-1,4-dioxide (3MN(2MF)QNXC). The prokaryotic strains used were Staphylococcus aureus ATCC 6538, S. aureus ATCC 6538P, S. aureus ATCC 29213, Escherichia coli ATCC 25922, E. coli S3R9, E. coli S3R22, E. coli TEM-1 CTX-M9, E. coli TEM-1, E. coli AmpC Mox-2, E. coli CTX-M2 e E. coli CTX-M9. The Candida albicans ATCC 10231 and Saccharomyces cerevisiae PYCC 4072 were used as eukaryotic strains. For the compounds that presented activity using the disk diffusion method, the minimum inhibitory concentration (MIC) was determined. The alterations of cellular viability were evaluated in a time-course assay. Death curves for bacteria and growth curves for S. cerevisiae PYCC 4072 were also accessed. The results obtained suggest potential new drugs for antimicrobial activity chemotherapy since the MIC's determined present low values and cellular viability tests show the complete elimination of the bacterial strain. Also, the cellular viability tests for the eukaryotic model, S. cerevisiae, indicate low toxicity for the compounds tested.

  1. Two dephosphorylation pathways of inositol 1,4,5-trisphosphate in homogenates of the cellular slime mould Dictyostelium discoideum

    NARCIS (Netherlands)

    Lookeren Campagne, Michiel M. van; Erneux, Cristophe; Eijk, Ronald van; Haastert, Peter J.M. van

    1988-01-01

    Dictyostelium discoideum homogenates contain phosphatase activity which rapidly dephosphorylates Ins(1,4,5)P3 (D-myo-inositol 1,4,5-trisphosphate) to Ins (myo-inositol). When assayed in Mg2+, Ins(1,4,5)P3 is dephosphorylated by the soluble Dictyostelium cell fraction to 20% Ins(1,4)P2 (D-myo-inosito

  2. Gadolinium-1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid conjugate of arabinogalactan as a potential liver-targeting magnetic resonance imaging contrast agent.

    Science.gov (United States)

    Xiao, Yan; Xue, Rong; You, Tianyan; Li, Xiaojing; Pei, Fengkui; Wang, Xuxia; Lei, Hao

    2014-08-18

    A novel biocompatible macromolecule (AG-CM-EDA-DOTA-Gd) was synthesized as a liver magnetic resonance imaging (MRI) contrast agent. AG-CM-EDA-DOTA-Gd consisted of a carboxymethyl-arabinogalactan unit conjugated with gadolinium-1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (Gd-DOTA) via ethylenediamine, and was specifically designed to bind to hepatocyte asialoglycoprotein in vivo, in an effort to develop a potential new tool for the diagnosis of liver diseases. The T1-relaxivity (8.87mmol(-1)Ls(-1)) of AG-CM-EDA-DOTA-Gd was 1.86 times than that of Gd-DOTA (4.76mmol(-1)Ls(-1)) in D2O at 9.4 T and 25°C. MRI experiments showed significant enhancement in rat liver following the intravenous administration of AG-CM-EDA-DOTA-Gd (0.094mmol Gd(3+)/kg body weight), which persisted for longer than Gd-DOTA (0.098mmol Gd(3+)/kg body weight). The mean percentage enhancements in the liver parenchyma were 85.2±6.5% and 19.3±3.3% for AG-CM-EDA-DOTA-Gd and Gd-DOTA, respectively. The results of this study therefore indicate that AG-CM-EDA-DOTA-Gd could be used as a potential liver-targeting contrast agent for MRI.

  3. Atomic layer deposition of stoichiometric Co{sub 3}O{sub 4} films using bis(1,4-di-iso-propyl-1,4-diazabutadiene) cobalt

    Energy Technology Data Exchange (ETDEWEB)

    Han, Byeol; Park, Jae-Min; Choi, Kyu Ha; Lim, Wan-Kyu; Mayangsari, Tirta R. [Department of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul 143-747 (Korea, Republic of); Koh, Wonyong [R& D Center, UP Chemical Co., Ltd. Pyeongtaek-si, Gyeonggi-do 459-050 (Korea, Republic of); Lee, Won-Jun, E-mail: wjlee@sejong.ac.kr [Department of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul 143-747 (Korea, Republic of)

    2015-08-31

    We report the deposition of cobalt oxide films at 120–300 °C using alternating injections of a novel liquid cobalt precursor, bis(1,4-di-iso-propyl-1,4-diazabutadiene)cobalt [C{sub 16}H{sub 32}N{sub 4}Co, Co(dpdab){sub 2}], and ozone. The saturation doses of Co(dpdab){sub 2} and O{sub 3}/O{sub 2} were 4 × 10{sup 6} and 1 × 10{sup 8} L, respectively. The atomic layer deposition (ALD) temperature window was between 120 °C and 250 °C with a maximum growth per cycle of 0.12 nm/cycle. The deposited films showed excellent step coverage. Cobalt oxide films deposited at 250 °C consisted of stoichiometric and crystalline Co{sub 3}O{sub 4}. - Highlights: • Cobalt oxide films were grown by ALD using a novel cobalt precursor and O{sub 3}. • The ALD temperature window was 120–250 °C with a growth per cycle of 0.12 nm/cycle. • Cobalt oxide thin films showed excellent step coverage. • Cobalt oxide films deposited at 250 °C were stoichiometric and crystalline Co{sub 3}O{sub 4}.

  4. New quinoxaline 1,4-di-N-oxides. Part 1: Hypoxia-selective cytotoxins and anticancer agents derived from quinoxaline 1,4-di-N-oxides.

    Science.gov (United States)

    Amin, Kamelia M; Ismail, Magda M F; Noaman, Eman; Soliman, Dalia H; Ammar, Yousry A

    2006-10-15

    Hypoxic cells which are common feature of solid tumors are resistant to both anticancer drugs and radiation therapy. Thus, the identification of drugs with the selective toxicity toward hypoxic cells is an important target in anticancer chemotherapy. Tirapazamine has been shown to be an efficient and selective cytotoxin after bioreductive activation in hypoxic cells which is thought to be due to the presence of the 1,4-di-N-oxide. A new series of quinoxaline 1,4-di-N-oxides and fused quinoxaline di-N-oxides were synthesized and evaluated for hypoxic-cytotoxic activity on EAC cell line. Compound 10a was the most potent cytotoxin IC(50) 0.9 microg/mL, potency 75 microg/mL, and was approximately 15 times more selective cytotoxin (HCR>111) than 3-aminoquinoxaline-2-carbonitrile which has been used as a standard (HCR>7.5). Compounds 4 and 3a,b were more selective than the standard. In addition, antitumor activity against Hepg2 (liver) and U251 (brain) human cell lines was evaluated, compounds 9c and 8a were the most active against Hepg2 with IC(50) values 1.9 and 2.9 microg/mL, respectively, however, all the tested compounds were nontoxic against U251 cell line.

  5. Simultaneous determination of five quinoxaline-1,4-dioxides in animal feeds using an immunochromatographic strip.

    Science.gov (United States)

    Le, Tao; Zhu, Liqian; Shu, Lihui; Zhang, Lei

    2016-01-01

    An immunochromatographic (ICG) strip was developed for the simultaneous quantitative determination of five quinoxaline-1,4-dioxides in animal feed. For this purpose, polyclonal antibodies (PcAb) with group-specific quinoxaline-1,4-dioxides were conjugated to colloidal gold particles as the detection reagent for ICG strips to test for quinoxaline-1,4-dioxides. This method achieved semi-quantitative detection of quinoxaline-1,4-dioxides within 5-10 min. The visual lower detection limits of the strip for quinocetone, cyadox, carbadox, mequindox and olaquindox were 10, 15, 15, 20 and 20 ng ml(-1), respectively. Using an ICG strip reader, the 50% inhibitions (IC50 values) were calculated to be 9.1, 13.5, 16.6, 20.2 and 21.3 ng ml(-1) for quinocetone, cyadox, carbadox, mequindox and olaquindox, respectively. When used to analyse samples of animal feed, acceptable recovery rates of 77.5-99.5% and coefficients of variation (CVs) of 4.3-10.7% were obtained. Levels measured with the ICG strip for 10 spiked samples were confirmed by HPLC with a high correlation coefficient of 0.9965 (n = 10). In conclusion, the method was rapid and accurate for simultaneous determination of five quinoxaline-1,4-dioxides antibiotics in animal feed.

  6. Physiologically based Pharmacokinetic Modeling of 1,4-Dioxane in Rats, Mice, and Humans

    Energy Technology Data Exchange (ETDEWEB)

    Sweeney, Lisa M.; Thrall, Karla D.; Poet, Torka S.; Corley, Rick; Weber, Thomas J.; Locey, B. J.; Clarkson, Jacquelyn; Sager, S.; Gargas, M. L.

    2008-01-01

    ABSTRACT 1,4-Dioxane (CAS No. 123-91-1) is used primarily as a solvent or as a solvent stabilizer. It can cause lung, liver and kidney damage at sufficiently high exposure levels. Two physiologically-based pharmacokinetic (PBPK) models of 1,4-dioxane and its major metabolite, hydroxyethoxyacetic acid (HEAA), were published in 1990. These models have uncertainties and deficiencies that could be addressed and the model strengthened for use in a contemporary cancer risk assessment for 1,4-dioxane. Studies were performed to fill data gaps and reduce uncertainties pertaining to the pharmacokinetics of 1,4-dioxane and HEAA in rats, mice, and humans. Three types of studies were performed:partition coefficient measurements, blood time course in mice, and in vitro pharmacokinetics using rat, mouse, and human hepatocytes. Updated PBPK models were developed based on these new data and previously available data. The optimized rate of metabolism for the mouse was significantly higher than the value previously estimated. The optimized rat kinetic parameters were similar to those in the 1990 models. Only two human studies were identified. Model predictions were consistent with one study, but did not fit the second as well. In addition, a rat nasal exposure was completed. The results confirmed water directly contacts rat nasal tissues during drinking water under bioassays. Consistent with previous PBPK models, nasal tissues were not specifically included in the model. Use of these models will reduce the uncertainty in future 1,4-dioxane risk assessments.

  7. Physiologically based pharmacokinetic modeling of 1,4-Dioxane in rats, mice, and humans.

    Science.gov (United States)

    Sweeney, Lisa M; Thrall, Karla D; Poet, Torka S; Corley, Richard A; Weber, Thomas J; Locey, Betty J; Clarkson, Jacquelyn; Sager, Shawn; Gargas, Michael L

    2008-01-01

    1,4-Dioxane (CAS No. 123-91-1) is used primarily as a solvent or as a solvent stabilizer. It can cause lung, liver, and kidney damage at sufficiently high exposure levels. Two physiologically based pharmacokinetic (PBPK) models of 1,4-dioxane and its major metabolite, hydroxyethoxyacetic acid (HEAA), were published in 1990. These models have uncertainties and deficiencies that could be addressed and the model strengthened for use in a contemporary cancer risk assessment for 1,4-dioxane. Studies were performed to fill data gaps and reduce uncertainties pertaining to the pharmacokinetics of 1,4-dioxane and HEAA in rats, mice, and humans. Three types of studies were performed: partition coefficient measurements, blood time course in mice, and in vitro pharmacokinetics using rat, mouse, and human hepatocytes. Updated PBPK models were developed based on these new data and previously available data. The optimized rate of metabolism for the mouse was significantly higher than the value previously estimated. The optimized rat kinetic parameters were similar to those in the 1990 models. Only two human studies were identified. Model predictions were consistent with one study, but did not fit the second as well. In addition, a rat nasal exposure was completed. The results confirmed water directly contacts rat nasal tissues during drinking water under bioassay conditions. Consistent with previous PBPK models, nasal tissues were not specifically included in the model. Use of these models will reduce the uncertainty in future 1,4-dioxane risk assessments.

  8. Evaluation of Clinical and MRI Staging for Prostate Cancer before Radical Prostatectomy

    Institute of Scientific and Technical Information of China (English)

    ZHONGChenyang; ZOUEnze; CHENMin; WANGWenchao; ZHAOWeifeng; WANBen; DENGShuming; YANGJianye

    2004-01-01

    To evaluate the clinical significance of clinical staging and magnetic resonance imaging (MRI) staging for prostate cancer before radical prostatectomy. Methods: Thirty-two patients with organ confined prostate cancer were reviewed to assess the accuracy of clinical staging and MRI staging to correlate with pathological staging results after radical prostatectomy. Results: 33.3% (10/30) prostate cancer patients with staging C and 3.3% (1/30) prostate cancer patients with staging D were diagnosed by pathology after radical prostatectomy in 30 patients with prostate cancer with clinical staging B, and 36.7% (11/30) under staging; Only one patient was over staging in clinical staging C. 19.1% (4/21) prostate cancer patients with staging C were diagnosed in 21 patients with prostate cancer and under staging with MRI staging B; 11.1% (1/9) was over staging with MRI staging C. The clinical staging and MRI staging had more correlation with pathological staging results (P=0.002), and PPV of the organ confined prostate cancer by clinical staging and MRI staging were 63.3% and 80.9% respectively, and NPV of nonorgan confined prostate cancer by clinical staging and MRI staging were 50% and 88.9% respectively. MRI staging was more specificity and accuracy than that of clinical staging to predict pathological staging results before radical prostatectomy (P=0.023). Conclusion: The MRI staging was more accuracy than that of clinical staging to predict pathological staging results in organ confined and nonorgan confined prostate cancer before radical prostatectomy.

  9. The Strongest 100 Point Radio Sources in the LMC at 1.4 GHz

    CERN Document Server

    Payne, J L; Filipovic, M D; Crawford, E J; De Horta, A Y

    2009-01-01

    We present the 100 strongest 1.4 GHz point sources from a new mosaic image in the direction of the Large Magellanic Cloud (LMC). The observations making up the mosaic were made over a ten year period and were combined with Parkes single dish data at 1.4 GHz to complete the image for short spacing. An initial list of co-identifications within 10" at 0.843, 4.8 and 8.6 GHz consisted of 2682 sources. Elimination of extended objects and artifact noise allowed the creation of a refined list containing 1988 point sources. Most of these are presumed to be background objects seen through the LMC; a small portion may represent compact H II regions, young SNRs and radio planetary nebulae. We find an average spectral index of -0.53 and present a 1.4 GHz image showing source location in the direction of the LMC.

  10. Regional expression of aquaporin 1, 4, and 9 in the brain during pregnancy.

    Science.gov (United States)

    Wiegman, Marchien J; Bullinger, Lisa V; Kohlmeyer, Meghan M; Hunter, Timothy C; Cipolla, Marilyn J

    2008-05-01

    Pregnancy is a state of physiologic adaptation, with significant changes in cardiovascular, renal, and hemodynamic systems. Aquaporins (AQPs) may play a role in facilitating these changes. While AQP expression has been assessed in several organs during pregnancy, little is known about its expression in the brain during pregnancy. Therefore, this study assesses the regional expression of AQP1, 4, and 9 during pregnancy and the postpartum period using real-time quantitative polymerase chain reaction. The authors show that AQP1, 4, and 9 are expressed in the anterior and posterior cerebrum, cerebellum, and brainstem of nonpregnant, midpregnant, late pregnant, and postpartum rats. The regional distribution pattern of AQP4 and 9 remained similar during gestation, whereas this pattern changed for AQP1. The expression levels of AQP1, 4, and 9 in the brainstem did not change with gestation, whereas changes were found in the anterior cerebrum for AQP4 and in the posterior cerebrum and cerebellum for all AQPs.

  11. SINTESIS TURUNAN ASETOFENON DARI 1-(4-ASETOKSIFENIL-3-METOKSI-2-PROPANIL FORMAT

    Directory of Open Access Journals (Sweden)

    Kusmiyati Kusmiyati

    2012-05-01

    Full Text Available The Synthesis of acetophenone derivative from 1-(4-acetoxyphenyl- 3-methoxy-2-propanyl formate through Fries Rearrangement in order to produce ortho hidroxy acetophenone derivative as starting material of Flavanoid compound has been done. The reaction of 1-(4-acetoxyphenyl-3-methoxy-2-propanyl formate was done by heating at 120 °C for 3 hours under AlCl3, dichloromethane as the catalyst and solvent, respectively. The structure of the compound was identified using Infra Red spectrometry (IR dan GC-MS. Fries rearrangement of 1-(4-acetoxyphenil-3- methoxy-2-propanyl formate produce 1-(2-hyidroxy-3-methoxy-5-propenyl- acetophenone and 1-(2-hyidroxy-3-methoxy-5-propanyl-acetophenone as side product with product rendemen were 43.26% and 9.48%, respectively.

  12. 1,4-Dihydropyridine Derivatives: Dihydronicotinamide Analogues-Model Compounds Targeting Oxidative Stress.

    Science.gov (United States)

    Velena, Astrida; Zarkovic, Neven; Gall Troselj, Koraljka; Bisenieks, Egils; Krauze, Aivars; Poikans, Janis; Duburs, Gunars

    2016-01-01

    Many 1,4-dihydropyridines (DHPs) possess redox properties. In this review DHPs are surveyed as protectors against oxidative stress (OS) and related disorders, considering the DHPs as specific group of potential antioxidants with bioprotective capacities. They have several peculiarities related to antioxidant activity (AOA). Several commercially available calcium antagonist, 1,4-DHP drugs, their metabolites, and calcium agonists were shown to express AOA. Synthesis, hydrogen donor properties, AOA, and methods and approaches used to reveal biological activities of various groups of 1,4-DHPs are presented. Examples of DHPs antioxidant activities and protective effects of DHPs against OS induced damage in low density lipoproteins (LDL), mitochondria, microsomes, isolated cells, and cell cultures are highlighted. Comparison of the AOA of different DHPs and other antioxidants is also given. According to the data presented, the DHPs might be considered as bellwether among synthetic compounds targeting OS and potential pharmacological model compounds targeting oxidative stress important for medicinal chemistry.

  13. 1,4-Dihydropyridine Derivatives: Dihydronicotinamide Analogues—Model Compounds Targeting Oxidative Stress

    Directory of Open Access Journals (Sweden)

    Astrida Velena

    2016-01-01

    Full Text Available Many 1,4-dihydropyridines (DHPs possess redox properties. In this review DHPs are surveyed as protectors against oxidative stress (OS and related disorders, considering the DHPs as specific group of potential antioxidants with bioprotective capacities. They have several peculiarities related to antioxidant activity (AOA. Several commercially available calcium antagonist, 1,4-DHP drugs, their metabolites, and calcium agonists were shown to express AOA. Synthesis, hydrogen donor properties, AOA, and methods and approaches used to reveal biological activities of various groups of 1,4-DHPs are presented. Examples of DHPs antioxidant activities and protective effects of DHPs against OS induced damage in low density lipoproteins (LDL, mitochondria, microsomes, isolated cells, and cell cultures are highlighted. Comparison of the AOA of different DHPs and other antioxidants is also given. According to the data presented, the DHPs might be considered as bellwether among synthetic compounds targeting OS and potential pharmacological model compounds targeting oxidative stress important for medicinal chemistry.

  14. 1,4-Dihydropyridine Derivatives: Dihydronicotinamide Analogues—Model Compounds Targeting Oxidative Stress

    Science.gov (United States)

    Velena, Astrida; Zarkovic, Neven; Gall Troselj, Koraljka; Bisenieks, Egils; Krauze, Aivars; Poikans, Janis; Duburs, Gunars

    2016-01-01

    Many 1,4-dihydropyridines (DHPs) possess redox properties. In this review DHPs are surveyed as protectors against oxidative stress (OS) and related disorders, considering the DHPs as specific group of potential antioxidants with bioprotective capacities. They have several peculiarities related to antioxidant activity (AOA). Several commercially available calcium antagonist, 1,4-DHP drugs, their metabolites, and calcium agonists were shown to express AOA. Synthesis, hydrogen donor properties, AOA, and methods and approaches used to reveal biological activities of various groups of 1,4-DHPs are presented. Examples of DHPs antioxidant activities and protective effects of DHPs against OS induced damage in low density lipoproteins (LDL), mitochondria, microsomes, isolated cells, and cell cultures are highlighted. Comparison of the AOA of different DHPs and other antioxidants is also given. According to the data presented, the DHPs might be considered as bellwether among synthetic compounds targeting OS and potential pharmacological model compounds targeting oxidative stress important for medicinal chemistry. PMID:26881016

  15. Proteome Changes of Human Bone Marrow Mesenchymal Stem Cells Induced by 1,4-Benzoquinone

    Science.gov (United States)

    2016-01-01

    Benzene is metabolized to hydroquinone in liver and subsequently transported to bone marrow for further oxidization to 1,4-benzoquinone (1,4-BQ), which may be related to the leukemia and other blood disorders. In the present study, we investigated the proteome profiles of human primary bone marrow mesenchymal stem cells (hBM-MSCs) treated by 1,4-BQ. We identified 32 proteins that were differentially expressed. Two of them, HSP27 and Vimentin, were verified at both mRNA and protein levels and their cellular localization was examined by immunofluorescence. We also found increased mRNA level of RAP1GDS1, a critical factor of metabolism that has been identified as a fusion partner in various hematopoietic malignancies. Therefore, these differentially expressed proteins can play important roles in benzene-mediated hematoxicity. PMID:28119923

  16. Stages of Gallbladder Cancer

    Science.gov (United States)

    ... cancer. Tests that examine the gallbladder and nearby organs are used to detect (find), diagnose, and stage ... cancer cells or to make cancer cells more sensitive to the effects of radiation therapy and certain ...

  17. Thyroid Cancer Staging

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Ja Young; Kim, Soo Jin; Kim, Eun Kyung; Kwak, Jin Young [Yonsei University College of Medicine, Seoul (Korea, Republic of)

    2011-06-15

    The current prevalence of thyroid cancer in women is high. Likewise, other cancers and thyroid cancer have been based on the TNM classification system. Staging of thyroid cancer has an important role in determining the extent of surgical excision and lymph node dissection, planning the adjuvant therapy after surgery and predicting the recurrence rate and the prognosis of patients. Ultrasonography is the basic imaging modality to identify the tumor size and the extent of lymph node metastasis. More recently, computed tomography, magnetic resonance imaging and positron emission tomography provide additional help for the staging of thyroid cancer. So, this article describes the 7th edition of the TNM staging of thyroid cancer, as proposed by the American Joint Committee on Cancer, and the details of radiologic evaluation of the T, N and M stages

  18. Late-Stage Caregiving

    Science.gov (United States)

    ... resources, care and ways to engage in meaningful connections. During the late stages, your role as a ... drinks. This will help you track the person's natural routine, and then you can plan a schedule. ...

  19. Understanding cancer staging

    Science.gov (United States)

    ... Manual and Handbook . 2nd ed. New York, NY: Springer; 2012. National Cancer Institute. Staging. Updated March 9, ... medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- ...

  20. Staged bilateral carotid endarterectomy

    DEFF Research Database (Denmark)

    Schroeder, T; Sillesen, H; Engell, Hans Christian

    1986-01-01

    In a series of 56 staged bilateral carotid endarterectomies, new neurologic symptoms developed in 5% and 20% following the first and second procedure, respectively. All complications were transient or minor. The incidence of postendarterectomy hypertension was significantly higher following...

  1. Recombinant β-1,3-1,4-glucanase from Theobroma cacao impairs Moniliophthora perniciosa mycelial growth.

    Science.gov (United States)

    Britto, Dahyana Santos; Pirovani, Carlos Priminho; Andrade, Bruno Silva; Dos Santos, Tassiara Pereira; Pungartnik, Cristina; Cascardo, Júlio Cezar M; Micheli, Fabienne; Gesteira, Abelmon S

    2013-09-01

    In this work, we identified a gene from Theobroma cacao L. genome and cDNA libraries, named TcGlu2, that encodes a β-1,3-1,4-glucanase. The TcGlu2 ORF was 720 bp in length and encoded a polypeptide of 239 amino acids with a molecular mass of 25.58 kDa. TcGlu2 contains a conserved domain characteristic of β-1,3-1,4-glucanases and presented high protein identity with β-1,3-1,4-glucanases from other plant species. Molecular modeling of TcGlu2 showed an active site of 13 amino acids typical of glucanase with β-1,3 and 1,4 action mode. The recombinant cDNA TcGlu2 obtained by heterologous expression in Escherichia coli and whose sequence was confirmed by mass spectrometry, has a molecular mass of about 22 kDa (with His-Tag) and showed antifungal activity against the fungus Moniliophthora perniciosa, causal agent of the witches' broom disease in cacao. The integrity of the hyphae membranes of M. perniciosa, incubated with protein TcGlu2, was analyzed with propidium iodide. After 1 h of incubation, a strong fluorescence emitted by the hyphae indicating the hydrolysis of the membrane by TcGlu2, was observed. To our knowledge, this is the first study of a cacao β-1,3-1,4-glucanase expression in heterologous system and the first analysis showing the antifungal activity of a β-1,3-1,4-glucanase, in particular against M. perniciosa.

  2. Normalization: A Preprocessing Stage

    OpenAIRE

    Patro, S. Gopal Krishna; Sahu, Kishore Kumar

    2015-01-01

    As we know that the normalization is a pre-processing stage of any type problem statement. Especially normalization takes important role in the field of soft computing, cloud computing etc. for manipulation of data like scale down or scale up the range of data before it becomes used for further stage. There are so many normalization techniques are there namely Min-Max normalization, Z-score normalization and Decimal scaling normalization. So by referring these normalization techniques we are ...

  3. Bioimpedance Spectroscopy in Detecting Lower-Extremity Lymphedema in Patients With Stage I, Stage II, Stage III, or Stage IV Vulvar Cancer Undergoing Surgery and Lymphadenectomy

    Science.gov (United States)

    2016-02-09

    Lymphedema; Perioperative/Postoperative Complications; Stage IA Vulvar Cancer; Stage IB Vulvar Cancer; Stage II Vulvar Cancer; Stage IIIA Vulvar Cancer; Stage IIIB Vulvar Cancer; Stage IIIC Vulvar Cancer; Stage IVA Vulvar Cancer; Stage IVB Vulvar Cancer

  4. Simple synthesis, structure and ab initio study of 1,4-benzodiazepine-2,5-diones

    Science.gov (United States)

    Jadidi, Khosrow; Aryan, Reza; Mehrdad, Morteza; Lügger, Thomas; Ekkehardt Hahn, F.; Ng, Seik Weng

    2004-04-01

    A simple procedure for the synthesis of pyrido[2,1-c][1,4] benzodiazepine-6,12-dione ( 1) and 1,4-benzodiazepine-2,5-diones ( 2a- 2d), using microwave irradiation and/or conventional heating is reported. The configuration of 1 was determined by single-crystal X-ray diffraction. A detailed ab initio B3LYP/6-31G* calculation of structural parameters and substituent effects on ring inversion barriers (Δ G#) and also free energy differences (Δ G0) for benzodiazepines are reported.

  5. Green synthesis and anxiolytic activity of some new dibenz-[1,4] diazepine-1-one analogues

    Directory of Open Access Journals (Sweden)

    Jaiprakash N. Sangshetti

    2017-02-01

    Full Text Available A facile, green approach for the synthesis of some new dibenz[1,4]-diazepine-1-one by a three component reaction of Diamine, 1,3 diketone and aromatic aldehyde using oxalic acid as catalyst in water is described. The products are formed in good yields (92–94%. Newly synthesized dibenz [1,4]-diazepine-1-one analogues were evaluated for the anxiolytic activity by the elevated plus maze method. From the activity data it is observed that compounds, 4g, 4h and 4k show promising anxiolytic activity.

  6. Clobazam: chemical aspects of the 1,4 and 1,5-benzodiazepines.

    Science.gov (United States)

    Kuch, H

    1979-01-01

    1 The structures and chemistry of the 1,4- and 1,5-benzodiazepines are compared. These two groups of drugs differ in respect to basicity, lipophilicity and electronic charge distribution. 2 The 1,4-benzodiazepine diazepam has a weakly basic imine group in contrast to the acid methylene protons of clobazam. 3 The imine function of diazepam is more lipophilic than the carboxamide group of clobazam with its rather hydrophilic character. 4 Diazepam and clobazam differ in electronic charge distribution and hence in the location of the chemically reactive centres, the imine partial structure in diazepam and the malonic acid portion of clobazam.

  7. Study of the complexation of oxacillin in 1-(4-Carbomethoxypyrrolidone)-terminated PAMAM dendrimers

    DEFF Research Database (Denmark)

    Hansen, Jon Stefan; Ficker, Mario; Petersen, Johannes Fabritius

    2013-01-01

    The complexation of oxacillin to three generations of 1-(4-carbomethoxypyrrolidone)-terminated PAMAM dendrimers was studied with NMR in CD3OD and CDCl3. The stochiometries, which were determined from Job plots, were found to be both solvent- and generation-dependent. The dissociation constants (Kd......) and Gibbs energies for complexation of oxacillin into the 1-(4-carbomethoxypyrrolidone)-terminated PAMAM dendrimer hosts were determined by (1)H NMR titrations and showed weaker binding of oxacillin upon increasing the size (generation) of the dendrimer....

  8. Studies on Epitaxial Polymerization of 1,3-Bis(3-quinolyl)-1,4-butadiyne

    Institute of Scientific and Technical Information of China (English)

    LI Tie-Sheng; Shuji Okada; Hachiro Nakanishi

    2004-01-01

    During investigating what causes the low yield of the polymerization product of 1,4-bis (quinolyl)-1, 3-butadiyne(DQ), we found that the DQ crystals formed on the surface of PDQ cauld be polymerized to give blue crystals, in which DQ could be sublimated and crystallized on the surface of PDQ film. According to the experimental results, the reason why the DQ crystals can be polymerized is that the sublimation of DQ changes the molecular orientation of DQ in the crystal. The crystals formed in epitaxial growth on the surface of DQ or PDQ during sublimation of DQ are suitable for 1,4-addition polymerization.

  9. Pathway for inositol 1,3,4-trisphosphate and 1,4-bisphosphate metabolism.

    OpenAIRE

    Inhorn, R C; Bansal, V S; Majerus, P W

    1987-01-01

    We prepared [3H]inositol-,3-[32P]phosphate-and 4-[32P]phosphate-labeled inositol phosphate substrates to investigate the metabolism of inositol 1,3,4-trisphosphate and inositol 1,4-bisphosphate. In crude extracts of calf brain, inositol 1,3,4-trisphosphate is first converted to inositol 3,4-bisphosphate, then the inositol 3,4-bisphosphate intermediate is further converted to inositol 3-phosphate. Similarly, inositol 1,4-bisphosphate is converted to inositol 4-phosphate, and no inositol 1-phos...

  10. Conductivity of I2-Doped High trans-1,4-Polybutadiene

    Institute of Scientific and Technical Information of China (English)

    史辰君; 薛怀国; 沈之荃; 张一烽; 李永舫; 杨春和

    2001-01-01

    High trans-1,4-polybutadiene ( ~ 96% (trans)) was prepared by lanthanum naphthenate catalytic systern. The conductivity of obtained polybutadiene doped with iodine reaches about ~10-3 s/cm, which is 2 orders of magnitude higher than the value reported.4,5 During the I2-doping, the conjugated sequence was formed through double bond shifting reaction. According to the relationship between conductivity and temperature, conducting mechanism of doped high trans-1,4-polybutadiene is fit on variable range hoping (VRH) model.

  11. Isolated renal vein thrombosis associated with MTHFR-1298 and PAI-1 4G gene mutations.

    Science.gov (United States)

    Cinemre, Hakan; Bilir, Cemil; Akdemir, Nermin

    2010-12-01

    Isolated renal vein thrombosis is very rare without the presence of nephrotic syndrome. It is more common in the newborns and infants. Whereas major risk factors in adults are the procoagulant states such as protein C or S deficiency, factor V Leiden mutation, primary or secondary antiphospholipid syndrome, severe hypothyroidism, and trauma. Here, we report a case of isolated renal vein thrombosis associated with MTHFR-1298 and PAI-1 4G gene mutations. It should be noted that the presence of MTHFR-1298 and PAI-1 4G gene mutations together might be one of the examples of genetic mutation combinations that increase the likelihood of a thrombotic event.

  12. Anaerobic transformation of 1,4-Tyrosol to 4-Hydoxyphenylacetate by Desulfovibrio Species

    Energy Technology Data Exchange (ETDEWEB)

    Chamkh, F.; El Bakouchi, I.; Ouazzani, N.; Said Eddarir, S.; Bennisse, R.; Qatibi, A. I.

    2009-07-01

    1,4 Tyrosol (4-hydroxyphenylethanol) is a phenolic compound that is typically found in olive oil, olive brine, and olive oil mill wastewaters. Its anaerobic transformation was investigated in Desulfovibrio strain EMSSDQT (chamkh et al., 2008) and Desulgovibrio alcoholivorans (Qatibi et al., 1991) using high-performance liquid chromatography (HPLC) and nuclear magnetic resonance ( {sup 1}3C-NMR) as analysis technic. To our knowledge, this is the first report showing the transformation of 1,4-tyrosol to 4-hydroxyphenylacetate (PHPA) by Desulfovibrio sp in anoxic conditions. (Author)

  13. Synthesis of carbon-13 and carbon-14 labelled triazolo-1,4-benzodiazepines

    Energy Technology Data Exchange (ETDEWEB)

    Banks, W.R.; Hawi, A.A.; Digenis, G.A. (Kentucky Univ., Lexington, KY (USA). College of Pharmacy)

    1989-04-01

    An efficient two-step synthesis of 8-chloro-1-methyl-6-phenyl-(3H)-S-triazolo-(4,3-a)(1,4)-benzodiazepine (alprazolam) and 8-chloro-6-(2-chlorophenyl)-1-methyl-(3H)-S-triazolo-(4,3-a)(1,4)-benzodiazepine (triazolam) labelled with carbon-13 or carbon-14 from their corresponding hydrazines is reported. The method involved acylation of the appropriate hydrazine using the mixed carbonic anhydride of sodium ({sup 13}C) or ({sup 14}C) acetate and isobutylchloroformate under mild conditions. Thermolysis of the resulting acetylhydrazides gave the target carbon-14 and carbon-13 labelled compounds in good yields. (author).

  14. 1,4-Bis(4,5-dihydro-1H-imidazol-2-ylbenzene–terephthalic acid–water (1/1/4

    Directory of Open Access Journals (Sweden)

    Shao-Ming Shang

    2009-11-01

    Full Text Available The asymmetric unit of the title compound, C12H14N4·C8H6O4·4H2O, consists of one half of the 1,4-bis(4,5-dihydro-1H-imidazol-2-ylbenzene (bib molecule, one half of the terephthalic acid (TA molecule and two water molecules. Both the bib and the TA molecules reside on crystallographic inversion centers, which coincide with the centroids of the respective benzene rings. The bib and the TA, together with the water molecules, are linked through intermolecular O—H...O, O—H...N and N—H...O hydrogen bonds, forming a three-dimensional network of stacked layers. Weak intermolecular C—H...O contacts support the stability of the crystal structure.

  15. Chemotherapy Toxicity On Quality of Life in Older Patients With Stage I, Stage II, Stage III, or Stage IV Ovarian Epithelial, Primary Peritoneal Cavity, or Fallopian Tube Cancer

    Science.gov (United States)

    2016-02-09

    Stage I Ovarian Cancer; Stage IA Fallopian Tube Cancer; Stage IB Fallopian Tube Cancer; Stage IC Fallopian Tube Cancer; Stage II Ovarian Cancer; Stage IIA Fallopian Tube Cancer; Stage IIB Fallopian Tube Cancer; Stage IIC Fallopian Tube Cancer; Stage III Ovarian Cancer; Stage III Primary Peritoneal Cancer; Stage IIIA Fallopian Tube Cancer; Stage IIIB Fallopian Tube Cancer; Stage IIIC Fallopian Tube Cancer; Stage IV Fallopian Tube Cancer; Stage IV Ovarian Cancer; Stage IV Primary Peritoneal Cancer

  16. Inhibition of jack bean urease by 1,4-benzoquinone and 2,5-dimethyl-1,4-benzoquinone. Evaluation of the inhibition mechanism.

    Science.gov (United States)

    Zaborska, Wiesława; Kot, Mirosława; Superata, Kinga

    2002-08-01

    1,4-benzoquinone (BQ) and 2,5-dimethyl-1,4-benzoquinone (DMBQ) were studied as inhibitors of jack bean urease in 50 mM phosphate buffer, pH 7.0. The mechanisms of inhibition were evaluated by progress curves studies and steady-state approach to data achieved by preincubation of the enzyme with the inhibitor. The obtained reaction progress curves were time-dependent and characteristic of slow-binding inhibition. The effects of different concentrations of BQ and DMBQ on the initial and steady-state velocities as well as the apparent first-order velocity constants obeyed the relationships of two-step enzyme-inhibitor interaction, qualified as mechanism B. The rapid formation of an initial BQ-urease complex with an inhibition constant of Ki = 0.031 mM was followed by a slow isomerization into the final BQ-urease complex with the overall inhibition constant of Ki* = 4.5 x 10(-5) mM. The respective inhibition constants for DMBQ were Ki = 0.42 mM, Ki* = 1.2 x 10(-3) mM. The rate constants of the inhibitor-urease isomerization indicated that forward processes were rapid in contrast to slow reverse reactions. The overall inhibition constants obtained by the steady-state analysis were found to be 5.1 x 10(-5) mM for BQ and 0.98 x 10(-3) mM for DMBQ. BQ was found to be a much stronger inhibitor of urease than DMBQ. A test, based on reaction with L-cysteine, confirmed the essential role of the sulfhydryl group in the inhibition of urease by BQ and DMBQ.

  17. Functionalization of anthracene: A selective route to brominated 1,4-anthraquinones

    Directory of Open Access Journals (Sweden)

    Kiymet Berkil Akar

    2011-07-01

    Full Text Available Efficient and stereoselective syntheses are described for the preparation of 2,3,9,10-tetrabromo-1,4-dimethoxy-1,2,3,4-tetrahydroanthracenes 7, 8 and the corresponding 1,4-diol 17 by silver ion-assisted solvolysis of hexabromotetrahydroanthracene 6. Base-promoted aromatization of 7 and 8 afforded synthetically valuable tribromo-1-methoxyanthracenes 10 and 11. The reaction of 17 with sodium methoxide generated tribromodihydroanthracene-1,4-diol 27, whose oxidation with PCC gave 2,9,10-tribromoanthracene-1,4-dione (28. Therefore a selective and efficient method was developed for the preparation of compound 28 starting from 9,10-dibromoanthracene (1, in a simple four-step process. Compounds 10 and 11, and diol 27 constitute key precursors for the preparation of functionalized substituted anthracene derivatives that are difficult to prepare by other routes. The studies also reveal the broad range of reactivity and selectivity of the stereoisomeric anthracene derivatives.

  18. Crosslinking and modification of dermal sheep collagen using 1,4-butanediol diglycidyl ether

    NARCIS (Netherlands)

    Zeeman, R; Dijkstra, PJ; van Wachem, PB; van Luyn, MJA; Hendriks, M; Cahalan, PT; Feijen, J

    1999-01-01

    Crosslinking of dermal sheep collagen (DSC) was accomplished using 1,4-butanediol diglycidyl ether (BDDGE). At pH values > 8.0, epoxide groups of BDDGE will react with amine groups of collagen. The effects of BDDGE concentration, pH, time, and temperature were studied. Utilization of a 4-wt % BDDGE

  19. Poly[bis[μ-1,4-bis(imidazol-1-ylmethylbenzene]dichloridocadmium(II

    Directory of Open Access Journals (Sweden)

    Xinliang Hu

    2008-07-01

    Full Text Available The title compound, [CdCl2(C14H14N42]n, has a slightly distorted octahedral coordination geometry, formed by four N atoms from 1,4-bis(imidazol-1-ylmethylbenzene ligands and two Cl atoms, giving a two-dimensional network. The Cd atom lies on a centre of inversion.

  20. More efficient redox biocatalysis by utilising 1,4-butanediol as a ‘smart cosubstrate’

    NARCIS (Netherlands)

    Kara, S.; Spickermann, D.; Schrittwieser, J.H.; Leggewie,C.; Van Berkel, W.J.H.; Arendsa, I.W.C.E.; Hollmann, F.

    2012-01-01

    1,4-Butanediol is shown to be an efficient cosubstrate to promote NAD(P)H-dependent redox biocatalysis. The thermodynamically and kinetically inert lactone coproduct makes the regeneration reaction irreversible. Thereby not only the molar surplus of cosubstrate is dramatically reduced but also faste

  1. More efficient redox biocatalysis by utilizing 1,4-butanediol as a ‘smart cosubstrate'

    NARCIS (Netherlands)

    Kara, S.; Spickermann, D.; Schrittwieser, J.H.; Leggewie, C.; Berkel, van W.J.H.; Arends, I.W.C.E.; Hollmann, F.

    2013-01-01

    1,4-Butanediol is shown to be an efficient cosubstrate to promote NAD(P)H-dependent redox biocatalysis. The thermodynamically and kinetically inert lactone coproduct makes the regeneration reaction irreversible. Thereby not only the molar surplus of cosubstrate is dramatically reduced but also faste

  2. Determination of lnositol 1,4,5-Trisphosphate Levels in Dictyostelium by Isotope Dilution Assay

    NARCIS (Netherlands)

    Haastert, Peter J.M. van

    1989-01-01

    A commercial isotope dilution assay was used for the determination of Ins(1,4,5)P3 levels in the microorganism Dictyostelium discoideum. Cross-reactivity in the assay was detected with extracts from cells and the medium. The compound which induced this cross-reactivity was tentatively identified as

  3. Multicomponent Reaction in Ionic Liquid: A Novel and Green Synthesis of 1, 4-Dihydropyridine Derivatives

    Institute of Scientific and Technical Information of China (English)

    Xin Ying ZHANG; Yan Zhen LI; Xue Sen FAN; Gui Rong QU; Xue Yuan HU; Jian Ji WANG

    2006-01-01

    An efficient and green method for the synthesis of 1, 4-dihydropyridine derivatives mediated in an ionic liquid, [bmim][BF4], through a four-component condensation process of aldehydes, 1, 3-dione, Meldrum's acid and ammonium acetate is disclosed in this paper.

  4. Radio confirmation of Galactic supernova remnant G308.3-1.4

    CERN Document Server

    De Horta, A Y; Filipovic, M D; Crawford, E J; Urosevic, D; Stootman, F H; Tothill, N F H

    2012-01-01

    We present radio-continuum observations of the Galactic supernova remnant (SNR) candidate, G308.3-1.4, made with the Australia Telescope Compact Array, Molonglo Observatory Synthesis Telescope and the Parkes radio telescope. Our results combined with Chandra X-ray images confirm that G308.3-1.4 is a bona fide SNR with a shell morphology. The SNR has average diameter of D = 34 +- 19 pc, radio spectral index of alpha = -0.68 +- 0.16 and linear polarisation of 10 +- 1%; We estimate the SNR magnetic field B = 29 uG. Employing a Sigma-D relation, we estimate a distance to G308.3-1.4 of d = 19 +- 11 kpc. The radio morphology, although complex, suggests a smaller size for the SNR than previously implied in an X-Ray study. These results imply that G308.3-1.4 is a young to middle-aged SNR in the early adiabatic phase of evolution.

  5. Organocatalytic Enantioselective Synthesis of 1,4-Dioxanes and Other Oxa-Heterocycles by Oxetane Desymmetrization.

    Science.gov (United States)

    Yang, Wen; Sun, Jianwei

    2016-01-26

    A new asymmetric synthesis of chiral 1,4-dioxanes and other oxa-heterocycles has been developed by means of organocatalytic enantioselective desymmetrization of oxetanes. This mild process proceeds with exceedingly high efficiency and enantioselectivity to establish the quaternary stereocenters. This method complements the existing, yet limited, strategies for the synthesis of these oxa-heterocycles.

  6. Teacher-Student Relationship and Peer Disliking and Liking across Grades 1-4

    Science.gov (United States)

    Hughes, Jan N.; Im, Myung H.

    2016-01-01

    Between-child and within-child effects of teacher-student warmth and conflict on children's peer-nominated disliking and liking across Grades 1-4 (ages 6-10) were investigated in a sample of 746 ethnically diverse and academically at-risk children in Texas. Multilevel modeling controlled for time-invariant between-child differences while modeling…

  7. Learning Progression of Ecological System Reasoning for Lower Elementary (G1-4) Students

    Science.gov (United States)

    Hokayem, Hayat Al

    2012-01-01

    In this study, I utilized a learning progression framework to investigate lower elementary students (G1-4) systemic reasoning in ecology and I related students reasoning to their sources of knowledge. I used semi-structured interviews with 44 students from first through fourth grade, four teachers, and eight parents. The results revealed that a…

  8. 21 CFR 177.1315 - Ethylene-1, 4-cyclohexylene dimethylene terephthalate copolymers.

    Science.gov (United States)

    2010-04-01

    ... production or added to impart desired physical or technical properties. (b) Specifications: Ethylene-1,4... carbonated beverages and beer. Conditions of hot fill not to exceed 82.2 °C (180 °F), storage at temperatures...), or (j). (c) Analytical method for determination of extractability. The total extracted...

  9. RADIAL DISTRIBUTION FUNCTION OF cis-1,4-POLYBUTADIENE BY ELECTRON DIFFRACTION

    Institute of Scientific and Technical Information of China (English)

    ZHOU Enle; KAN Xianglan; ZHAO Xiaoguang

    1983-01-01

    The interatomic distance function of rareearth catalyzed cis-1,4-polybutadiene was studied by radial distribution function (RDF) derived from electron diffraction. Two intramolecular peaks and three intermolecular peaks have been found on the RDF. The appearance of such a number of intermolecular maxima on the RDF can be explained by the local parallel packing of long molecular chains of the amorphous polymers.

  10. High molecular weight polyurethanes and a polyurethane urea based on 1,4-butanediisocyanate

    NARCIS (Netherlands)

    Spaans, CJ; de Groot, JH; Dekens, FG; Pennings, AJ

    1998-01-01

    New biomedical polyurethanes and a polyurethane urea based on epsilon-caprolactone and 1,4-butanediisocyanate have been developed. On degradation, only non-toxic products are produced. The polyurethane urea with poly(epsilon-caprolactone) soft segments and butanediisocyanate/butanediamine hard segme

  11. High affinity, bioavailable 3-amino-1,4-benzodiazepine-based gamma-secretase inhibitors.

    Science.gov (United States)

    Owens, Andrew P; Nadin, Alan; Talbot, Adam C; Clarke, Earl E; Harrison, Timothy; Lewis, Huw D; Reilly, Michael; Wrigley, Jonathan D J; Castro, José L

    2003-11-17

    In this paper, we describe the development of a novel series of high affinity, orally bioavailable 3-amino-1,4 benzodiazepine-based gamma-secretase inhibitors for the potential treatment of Alzheimer's disease. We disclose structure-activity relationships based around the 1, 3 and 5 positions of the benzodiazepine core structure.

  12. Synthesis and in vitro cytotoxicity of novel 1,4-disubstituted phthalazines

    Institute of Scientific and Technical Information of China (English)

    Xin Zhai; Juan Li; Lei He; Su Zheng; Yao Bin Zhang; Ping Gong

    2008-01-01

    Eight novel 1,4-disubstituted phthalazines (7-14) were designed and synthesized. The structures of all the synthesizedcompounds were confirmed by IR, 1H NMR,13C NMR, MS and elemental analysis. Their in vitro cytotoxicity against cancercell lines (Bel-7402 and HT-1080) were evaluated by standard MTT assay. Among them, compounds 9 and 11 exhibited more potentcytotoxicity than cisplatin.

  13. FIELD STUDY: IN SITU OXIDATION OF 1,4-DIOXANE WITH OZONE AND HYDROGEN PEROXIDE

    Science.gov (United States)

    A pilot-scale field evaluation is underway to assess the effectiveness of in situ oxidation (using ozone with and without hydrogen peroxide) for remediation of 1,4-dioxane and chlorinated volatile organic compounds in groundwater at the Cooper Drum Company Superfund Site located ...

  14. Studies on the antibacterial and antifungal properties of 1,4-naphthoquinones

    Science.gov (United States)

    Ambrogi, V.; Artini, D.; de Carneri, I.; Castellino, S.; Dradi, E.; Logemann, W.; Meinardi, G.; Di Somma, M.; Tosolini, G.; Vecchi, E.

    1970-01-01

    1. New halogenated 1,4-naphthoquinones were synthesized and together with other known 1,4-naphthoquinones, were screened for antibacterial activity by a turbidimetric method, and for antifungal activity by the diffusion method on agar plates. 2. The half-wave potentials and the influence on the oxidative phosphorylation of some of these compounds were determined. 3. 2-chloro-3,2′-chloro-ethyl-1,4-naphthoquinone (half-wave potential=-187 mV) was the most active compound, completely inhibiting cell respiration. 4. While the natural active naphthoquinones, vitamin K and ubiquinones, possess, as substituent, the electron repelling methyl group, the microbiologically active 1,4-naphthoquinones are substituted, in the quinone moiety, with electron attracting groups such as OH or Cl. 5. The half-wave potentials can give only an initial indication of the activity of the compounds studied; a good correlation, on the contrary, can be found between the ultraviolet spectra of such compounds and their activity which seems to depend on the ability of active compounds to exist in an extensively conjugated structure and to form hydrogen bonds. PMID:4992959

  15. NMR study of 1,4-dihydropyridine derivatives endowed with long alkyl and functionalized chains

    Energy Technology Data Exchange (ETDEWEB)

    Suarez, Margarita; Salfran, Esperanza; Rodriguez, Hortensia; Coro, Julieta, E-mail: msuarez@fq.uh.c [Universidad de La Habana (Cuba). Facultad de Quimica. Lab. de Sintesis Organica; Molero, Dolores; Saez, Elena [Universidad Complutense, Madrid (Spain). CAI-RMN; Martinez-Alvarez, Roberto; Martin, Nazario [Universidad Complutense, Madrid (Spain). Facultad de Quimica. Dept. de Quimica Organica I

    2011-07-01

    The {sup 1}H , {sup 13}C and {sup 15}N NMR spectroscopic data for 1,4-dihydropyridine endowed with long alkyl and functionalized chain on C-3 and C-5, have been fully assigned by combination of one- and two dimensional experiments (DEPT, HMBC, HMQC, COSY, nOe). (author)

  16. A NEW CELL CLONE DERIVED FROM TRICHOPLUSIA NI TN5B1-4 CELLS

    Institute of Scientific and Technical Information of China (English)

    Jian-xiaoTian; Chang-youLi; Gui-lingZheng; Guo-xunLi; PingWang; Granados

    2004-01-01

    The characteristics of a cultured cell line do not always remain stable and may change upon continuous passage. Most continuous cell lines, even after cloning, possess several genotypes that are constantly changing. There are numerous selective and adaptive culture processes, in addition to genetic instability, that may improve phenotypic change in cell growth, virus susceptibility, gene expression, and production of virus. Similar detrimental effects of long term passaging of insect cells have also been reported for continuous cell lines, for example, Tn5B 1-4 cells, which are the most widely used for the baculovirus expression vector system (BEVS), provide superior production of recombinant proteins,however, this high productivity may be more evident in low passage cells. In this paper, we describe the isolation of a cell clone, Tn5B-40, from low passage Tn5B 1-4 cells. The growth characteristics,productions of virus, and high level of recombinant protein productions were determined. The results showed the susceptibility of both clone and Tn5B 1-4 cells to wild-type AcNPV was approximately the same rate with over 95% of infection; when the cloned cells were infected with recombinant baculoviruses expressing β-galactosidase and secreted alkaline phosphatase (SEAP), expression of the recombinant proteins from the cloned cells exceeded that from the parental Tn5B 1-4 cells.

  17. Electrochemical stability and transformations of fluorinated poly(2,6-dimethyl-1,4-phenylene oxide)

    NARCIS (Netherlands)

    Pud, A.A.; Rogalsky, S.P.; Ghapoval, G.S.; Kharitonov, A.P.; Kemperman, A.

    2000-01-01

    Fluorination of poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) leads to narrowing of its window of electrochemical stability in a cathodic range of potentials. It is found this is connected with appearance of both perfluorinated and incompletely fluorinated units in the polymer. The former units are l

  18. Bioinspired total synthesis of katsumadain A by organocatalytic enantioselective 1,4-conjugate addition

    Directory of Open Access Journals (Sweden)

    Yongguang Wang

    2013-08-01

    Full Text Available Katsumadain A, a naturally occurring influenza virus neuraminidase (NA inhibitor, was synthesized by using a bioinspired, organocatalytic enantioselective 1,4-conjugate addition of styryl-2-pyranone with cinnamaldehyde, followed by a tandem Horner–Wadsworth–Emmons/oxa Michael addition.

  19. 40 CFR 721.1577 - 1,4-Benzenedicarboxylic acid, bis [4-(ethenyloxy) butyl] ester.

    Science.gov (United States)

    2010-07-01

    ... ester. 721.1577 Section 721.1577 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED... Specific Chemical Substances § 721.1577 1,4-Benzenedicarboxylic acid, bis ester. (a) Chemical substance and... acid, bis ester (PMN P-98-1163; CAS No. 117397-31-6) is subject to reporting under this section for...

  20. Chemical consequences of long-range orbital interaction in perhydronaphtalene-1,4 diol monosulfonate esters.

    NARCIS (Netherlands)

    Orru, R.V.A.

    1994-01-01

    In this thesis the base-induced reactions of perhydronaphthalene-1,4-diol monosulfonate esters are described. These compounds undergo smoothly, typical carbocationic processes upon treatment with sodium tert -amylate in refluxing benzene. The product outcome, product ratio, and (relative) rate of th

  1. Convenient synthesis of some optically active 1,4-benzodiazepin-2,5-diones

    Institute of Scientific and Technical Information of China (English)

    M. Bakavoli; A. Davoodnia; R. Shahnaee

    2008-01-01

    Isatoic anhydride was reacted with several L-amino acids to give the corresponding (2S)-N-(o-aminobenzoyl)-2-alkyl-aminoacetic acids. The latter compounds were treated with phosphoryl chloride under reflux temperature to afford the eyclizedproducts, (3S)-3-alkyl-3,4-dihydro- 1H- 1,4-benzodiazepin-2,5-diones.

  2. Synthesis of (E,E)-Germacrane Sesquiterpene Alcohols via Enolate-Assisted 1,4-Fragmentation

    NARCIS (Netherlands)

    Minnaard, Adriaan J.; Wijnberg, Joannes B.P.A.; Groot, Aede de

    1997-01-01

    An efficient method has been developed for the synthesis of (E,E)-germacrane sesquiterpene alcohols. The key step in these syntheses involves the enolate-assisted 1,4-fragmentation of properly functionalized perhydro-1-naphthalenecarboxaldehydes with 1 equiv of sodium tert-amylate as base, to give t

  3. Unusual Ring Contration by Substitution of 4-O-activated-pentono-1,5-lactams with cyanide. Stereospecific Synthesis of 6-Amino-1,4,5,6-tetradeoxy-1,4-imino-hexitols

    DEFF Research Database (Denmark)

    Godskesen, Michael Anders; Lundt, Inge; Søtofte, Inger

    2000-01-01

    case. Reduction of the cyanolactams with LiAlH4 gave 6-amino-1,4,5,6-tetradeoxy-1,4-imino-L-lyxo-6 or -L-ribo-16-hexitol, respectively. The 6-amino-1,4,5,6-tetradeoxy-1,4-imino-L-ribo-hexitol 16 was found to be a moderate inhibitor of alpha-L-fucosidase with a K-i of 110 mu M. (C) 2000 Elsevier Science...

  4. Composers on stage

    DEFF Research Database (Denmark)

    Groth, Sanne Krogh

    A trend on the scene of contemporary music is composers going on stage, performing their pieces themselves. Within a discourse of popular music, this is more the rule than exception, but when it comes to the context of contemporary scored music, the historical and aesthetic context differs......, and something quite different is undergoing. This paper intends to discuss three examples of performances in which the composer’s appearance on stage was an important part of the piece, - both when it came to the role as a performer and as an individual person – as representer and presenter. The paper intends...... 2011 and Fischer-Lichte 2008) Hereby, the role of the composer appearing on stage is discussed from an aesthetic point of view; meanwhile social and political aspects of the phenomenon are also addressed. The three artistic works discussed are Simon Steen-Andersen’s Run Time Error (2009-), Niels...

  5. Staging of prostate cancer.

    Science.gov (United States)

    Cheng, Liang; Montironi, Rodolfo; Bostwick, David G; Lopez-Beltran, Antonio; Berney, Daniel M

    2012-01-01

    Prostatic carcinoma (PCa) is a significant cause of cancer morbidity and mortality worldwide. Accurate staging is critical for prognosis assessment and treatment planning for PCa. Despite the large volume of clinical activity and research, the challenge to define the most appropriate and clinically relevant staging system remains. The pathologically complex and uncertain clinical course of prostate cancer further complicates the design of staging classification and a substaging system suitable for individualized care. This review will focus on recent progress and controversial issues related to prostate cancer staging. The 2010 revision of the American Joint Committee on Cancer/Union Internationale Contre le Cancer (AJCC/UICC) tumour, node and metastasis (TNM) system is the most widely used staging system at this time. Despite general acceptance of the system as a whole, there is controversy and uncertainty about its application, particularly for T2 subclassification. The three-tiered T2 classification system for organ-confined prostate cancer is superfluous, considering the biology and anatomy of PCa. A tumour size-based substaging system may be considered in the future TNM subclassification of pT2 cancer. Lymph node status is one of the most important prognostic factors for prostate cancer. Nevertheless, clinical outcomes in patients with positive lymph nodes are variable. Identification of patients at the greatest risk of systemic progression helps in the selection of appropriate therapy. The data suggest that the inherent aggressiveness of metastatic prostate cancer is closely linked to the tumour volume of lymph node metastasis. We recommend that a future TNM staging system should consider subclassification of node-positive cancer on the basis of nodal cancer volume, using the diameter of the largest nodal metastasis and/or the number of positive nodes.

  6. Bilobalide inhibits the expression of aquaporin 1, 4 and glial fibrillary acidic protein in rat brain tissue after permanent focal cerebral ischemia

    Institute of Scientific and Technical Information of China (English)

    Haiming Qin; Fulin Song; Hongguang Han; Hong Qu; Xingwen Zhai; Bin Qin; Song You

    2011-01-01

    The present results demonstrated that in an adult rat model of permanent middle cerebral artery occlusion (pMCAO), pretreatment with bilobalide reduced brain water content and infarct area, down-regulated aquaporin 1, 4 mRNA expression in brain edema tissue, then inhibited their synthesis in the striatum, in particular at the early stage of ischemia (at 8 hours after pMCAO), inhibited glial fibrillary acidic protein expression, and lightened reactive gliosis. These data sug-gest that bilobalide attenuates brain edema formation due to reduced expression of aquaporins.

  7. Synthesis, Characterization and Antitumor Activities of Co, Ni, Cu, Zn Complexes with 1,4,7,10- tetrakis (4- nitrobenzyl )- 1,4,7,10- tetraazacyclododecane Macrocyclic Ligand

    Institute of Scientific and Technical Information of China (English)

    孔德源; 谢雨礼; 谢毓元; 黄小荧

    2000-01-01

    New tetraazamacrocyclic ligand with 1, 4, 7, 10-tetrakis (4-nitrobenzyl) pendent groups (C36H40N8O8, Mr= 712.76) crystallized in the monoclinic system, P21/n space group with unit cell parameters: a=7. 834(2), b=22. 902(6), c =10. 147(3)A, β=106.53(2)°, V=1745(1)A3, Z=2, Dc=1. 356 g/cm3, λ(MoKa)=0. 71069 A ; μ=0. 92cm-1, F(000)=752, T=296K. The final R and Rw values are 0.065 and 0.066, respectively. The Cu( Ⅱ ), Ni( Ⅱ ), Co( Ⅱ ), Zn( Ⅱ ) complexes with this new ligand have been synthesized and characterized by elemental analyses, IR, UV, ESI-MS and molar conductance. The macrocyclic ligand molecular structure is centrosymmetrical. All complexes are in accordance with the general forN8O8). The central metal ions coordinate to four nitrogen atoms of azamacrocycle and two oxygen atoms of one nitrate ion. Preliminary pharmacological tests against P-388and A-549 tumor cell lines showed that all these complexes had considerable activities in vitro.

  8. 1,4-二乙氧基苯的相转移催化合成%Synthesis of 1,4-Diethoxybenzene Catalyzed by Phase Transfer Catalyst

    Institute of Scientific and Technical Information of China (English)

    颜桂炀; 郑柳萍; 林深

    2002-01-01

    采用大孔型交联聚苯乙烯为载体研究制得新型季钅米舛盐型相转移催化剂Y98B,并将其应用于1,4-二乙氧基苯的催化合成反应,进行了产品的红外光谱分析和熔点测定,探讨了催化剂用量、对苯二酚与溴乙烷物的质量比、反应温度和反应时间等动力学条件对产品收率的影响.确定了在反应温度为70℃,mol对苯二酚∶mol溴乙烷=1∶3.5,反应时间4h,催化剂用量3.0g的条件下产品收率可达84.3%

  9. Synthesis of 1,4 - Diethoxybenzene Catalyzed by Phase Transfer Catalyst%1,4-二乙氧基苯的相转移催化合成

    Institute of Scientific and Technical Information of China (English)

    颜桂炀; 郑柳萍; 林深

    2001-01-01

    采用大孔型交联聚苯乙烯为载体研制出新型季鏻盐型相转移催化剂Y98B,并将其应用于1,4-二乙氧基苯的催化合成反应,产品进行了红外光谱分析和熔点测定,探讨了催化剂用量、对苯二酚与溴乙烷物质的量比、反应温度和反应时间等动力学条件对产品收率的影响.确定了在反应温度为70℃、对苯二酚:溴乙烷(摩尔比)为1:3.5、反应时间为4h、催化剂用量为3.0g的条件下产品收率可达84.3%.

  10. 1,4-Diamino-2-butanone, a putrescine analogue, promotes redox imbalance in Trypanosoma cruzi and mammalian cells.

    Science.gov (United States)

    Soares, Chrislaine O; Colli, Walter; Bechara, Etelvino J H; Alves, Maria Julia M

    2012-12-15

    The putrescine analogue 1,4-diamino-2-butanone (DAB) is highly toxic to various microorganisms, including Trypanosoma cruzi. Similar to other α-aminocarbonyl metabolites, DAB exhibits pro-oxidant properties. DAB undergoes metal-catalyzed oxidation yielding H(2)O(2), NH(4)(+) ion, and a highly toxic α-oxoaldehyde. In vitro, DAB decreases mammalian cell viability associated with changes in redox balance. Here, we aim to clarify the DAB pro-oxidant effects on trypomastigotes and on intracellular T. cruzi amastigotes. DAB (0.05-5 mM) exposure in trypomastigotes, the infective stage of T. cruzi, leads to a decline in parasite viability (IC(50)c.a. 0.2 mM DAB; 4 h incubation), changes in morphology, thiol redox imbalance, and increased TcSOD activity. Medium supplementation with catalase (2.5 μM) protects trypomastigotes against DAB toxicity, while host cell invasion by trypomastigotes is hampered by DAB. Additionally, intracellular amastigotes are susceptible to DAB toxicity. Furthermore, pre-treatment with 100-500 μM buthionine sulfoximine (BSO) of LLC-MK2 potentiates DAB cytotoxicity, whereas 5 mM N-acetyl-cysteine (NAC) protects cells from oxidative stress. Together, these data support the hypothesis that redox imbalance contributes to DAB cytotoxicity in both T. cruzi and mammalian host cells.

  11. Inositol 1,4,5-trisphosphate 3-kinase B controls survival and prevents anergy in B cells.

    Science.gov (United States)

    Maréchal, Yoann; Quéant, Séverine; Polizzi, Selena; Pouillon, Valérie; Schurmans, Stéphane

    2011-01-01

    Inositol 1,4,5-trisphosphate 3-kinase B (or Itpkb) and inositol 1,3,4,5-tetrakisphosphate (Ins(1,3,4,5)P4), its reaction product, play an important role in the control of B lymphocyte fate and function in vivo. In order to investigate the fine mechanisms of Itpkb and Ins(1,3,4,5)P4 action in B cells, we crossed Itpkb(-/-) mice with transgenic mice expressing a 3-83μδ B cell receptor (BCR) specific for membrane-bound MHC-I H2-K(b) and H2-K(k) molecules. On a non-deleting H2-K(d) genetic background, we show that Itpkb is important for the control of Bim protein expression and B cell survival rather than for the control of B cell development from one stage to another. Analyses of cell surface markers expression, proapoptotic Bim protein expression, in vitro survival and in vivo turnover demonstrated that BCR transgenic Itpkb(-/-) B cells exhibit an anergic phenotype with the notable exception of their enhanced antigen-induced calcium signalling. On a deleting H2-K(b) genetic background, we show that Itpkb is not essential for BCR editing or negative selection. These data establish Itpkb as an important regulator of B cell survival and anergy in vivo.

  12. Interactions between the inositol 1,4,5-trisphosphate and cyclic AMP signaling pathways regulate larval molting in Drosophila.

    Science.gov (United States)

    Venkatesh, K; Siddhartha, G; Joshi, R; Patel, S; Hasan, G

    2001-05-01

    Larval molting in Drosophila, as in other insects, is initiated by the coordinated release of the steroid hormone ecdysone, in response to neural signals, at precise stages during development. In this study we have analyzed, using genetic and molecular methods, the roles played by two major signaling pathways in the regulation of larval molting in Drosophila. Previous studies have shown that mutants for the inositol 1,4,5-trisphosphate receptor gene (itpr) are larval lethals. In addition they exhibit delays in molting that can be rescued by exogenous feeding of 20-hydroxyecdysone. Here we show that mutants for adenylate cyclase (rut) synergize, during larval molting, with itpr mutant alleles, indicating that both cAMP and InsP(3) signaling pathways function in this process. The two pathways act in parallel to affect molting, as judged by phenotypes obtained through expression of dominant negative and dominant active forms of protein kinase A (PKA) in tissues that normally express the InsP(3) receptor. Furthermore, our studies predict the existence of feedback inhibition through protein kinase A on the InsP(3) receptor by increased levels of 20-hydroxyecdysone.

  13. Antisense Oligonucleotides Targeting Parasite Inositol 1,4,5-Trisphosphate Receptor Inhibits Mammalian Host Cell Invasion by Trypanosoma cruzi

    Science.gov (United States)

    Hashimoto, Muneaki; Nara, Takeshi; Hirawake, Hiroko; Morales, Jorge; Enomoto, Masahiro; Mikoshiba, Katsuhiko

    2014-02-01

    Chagas disease is caused by an intracellular parasitic protist, Trypanosoma cruzi. As there are no highly effective drugs against this agent that also demonstrate low toxicity, there is an urgent need for development of new drugs to treat Chagas disease. We have previously demonstrated that the parasite inositol 1,4,5-trisphosphate receptor (TcIP3R) is crucial for invasion of the mammalian host cell by T. cruzi. Here, we report that TcIP3R is a short-lived protein and that its expression is significantly suppressed in trypomastigotes. Treatment of trypomastigotes, an infective stage of T. cruzi, with antisense oligonucleotides specific to TcIP3R deceased TcIP3R protein levels and impaired trypomastigote invasion of host cells. Due to the resulting instability and very low expression level of TcIP3R in trypomastigotes indicates that TcIP3R is a promising target for antisense therapy in Chagas disease.

  14. How Is Ovarian Cancer Staged?

    Science.gov (United States)

    ... Cancer Early Detection, Diagnosis, and Staging How Is Ovarian Cancer Staged? Staging is the process of finding out ... Ask Your Doctor About Ovarian Cancer? More In Ovarian Cancer About Ovarian Cancer Causes, Risk Factors, and Prevention ...

  15. Staging of Lung Cancer

    Science.gov (United States)

    ... is important for two reasons. First, staging your lung cancer helps decide which therapy (or therapies) should be used. Second, lung cancer ... 422-6237 http://www.cancer.gov/cancertopics/wyntk/lung/page8 http://www.cancer.gov/cancertopics/pdq/treatment/non- small-cell-lung/Patient/page2 National Lung ...

  16. Stages of Hypopharyngeal Cancer

    Science.gov (United States)

    ... not spread to the larynx (voice box); or cancer has spread to the larynx or esophagus and is more than 4 centimeters; ... a common treatment for all stages of hypopharyngeal cancer. The following surgical ... to remove the larynx (voice box) and part of the pharynx (throat). ...

  17. World Stage Design

    Index Scriptorium Estoniae

    2005-01-01

    12-19. III Torontos rahvusvaheline lavakujunduse, kostüümi ning valgus- ja helikujunduse näitus, mis toimub samaaegselt OISTATi (International Organization of Scenographers, Theatre Architects and Technicians) maailmakongressiga ja USITT (United States Institute for Theatre Technology) üritustega (konverents, Stage Expo). Eestit esindab lavakujunduse kategoorias Lilja Blumenfeld-Luhse

  18. Implicit stage topics

    Directory of Open Access Journals (Sweden)

    Karen Lahousse

    2008-04-01

    Full Text Available Il a souvent été proposé que les éléments spatio-temporels en position initiale de phrase spécifient le cadre de l’événement dénoté par la proposition et ont une interprétation thématique ou topicale. Alors que les topiques spatio-temporels explicites ont souvent été étudiés, Erteschik-Schir (1997, 1999 propose l’idée que les topiques spatio-temporels, ou topiques scéniques (stage topics peuvent aussi être implicites.Dans cet article, nous offrons des arguments en faveur de la notion de topique scénique implicite. Nous montrons qu’un certain nombre de cas d’inversion nominale en français, une configuration syntaxique qui est favorisée par la présence d’un topique scénique explicite, s’expliquent par la présence d’un topique scénique implicite. Le fait que les topiques scéniques implicites interagissent avec la structure syntaxique de la même façon que les topiques scéniques explicites constitue un argument empirique en faveur de leur existence.It has often been proposed that sentence-initial spatio-temporal elements specify the frame in which the whole proposition takes place and are topical (i.e. thematic. Whereas considerable attention has been paid to explicit spatio-temporal topics, Erteschik-Shir (1997, 1999 argues that spatio-temporal topics, or stage topics, can also be implicit.In this article we provide evidence in favour of the notion of implicit stage topic. We show that a certain number of nominal inversion cases in French, a syntactic configuration which is triggered by the presence of an explicit stage topic, are explained by the presence of an implicit stage topic. The fact that implicit stage topics interact with syntactic structure the same way explicit stage topics do constitutes a strong empirical argument in favour of their existence.

  19. Multi-stage cleaning plant

    Energy Technology Data Exchange (ETDEWEB)

    Kullendorff, A.; Wikner, J.

    1980-12-09

    A cleaning plant positioned within an annular fluidized bed combustion chamber is divided into a plurality of separate cleaning stages, wherein a first stage is located adjacent the fluidized bed and additional stages are arranged within the first stage. Each stage comprises a plurality of separate cleaning devices which act in parallel, while cleaning devices of different stages act in series to remove debris from the combustion gases that exit from the fluidized bed combustion chamber.

  20. A Competition Binding Assay for Determination of the Inositol (1,4,5)-Trisphosphate Content of Human Leucocytes

    NARCIS (Netherlands)

    Nibbering, Peter H.; Zomerdijk, Timo P.L.; Haastert, Peter J.M. van; Furth, Ralph van

    1990-01-01

    We developed a competition binding assay for estimation of the intracellular inositol (1,4,5)-trisphosphate (Ins(1,4,5)P3) and optimalized it for the measurement of the Ins(1,4,5)P3 content of human blood leucocytes. The present method is considerably cheaper and requires five times fewer cells than

  1. D 1.4.1. Review of Scientific Literature on Performance, Innovation and Management of Supply Chains

    NARCIS (Netherlands)

    Uffelen, van R.L.M.; Immink, V.M.; Trienekens, J.H.

    2007-01-01

    The aim of the Work package 1.4 INNOCHAIN (WP1.4) of ISAfruit is to develop a conceptual framework of the mechanisms underlying supply chain management, in particular chain innovativeness, of the European supply chains in such a way that performance can be maximized. The results of WP1.4 will contri

  2. Selective Synthesis of [2+2] Macrocyclic Schiff Bases from Chiral 1,4-Diamines

    Institute of Scientific and Technical Information of China (English)

    ZHU Hai-Bin; HU Da-Hua; DONG Hua-Ze; LI Gen-Xi; GOU Shao-Hua

    2007-01-01

    [2+2] macrocyclic Schiff bases of three kinds have been synthesized from chiral 1,4-diamines by use of different methods. Macrocyclic Schiff bases 1a-1c have been selectively obtained based on a non-templated dilution method from chiral 1,4-diamines a-c and dialdehyde DA1, whereas macrocycles 2a-2c have been selectively produced from reaction of diamines a-c and dialdehyde DA2 in the presence of boric acid as templates. Macrocyclic Schiff bases 3a-3c have been afforded in high selectivity from diamines a-c and dialdehyde DA3 by means of sodium-template. All the titled compounds have been confirmed by 1H NMR and ESI-MS analyses.

  3. Synthesis of Chiral 1,4-Disubstituted-1,2,3-Triazole Derivatives from Amino Acids

    Directory of Open Access Journals (Sweden)

    Morten Grøtli

    2009-12-01

    Full Text Available A versatile method for the synthesis of chiral 1,4-disubstituted-1,2,3-triazole derivatives starting from easily accessible naturally occurring D-or L-amino acids as chiral synthons is described. The amino acids were converted into azido alcohols, followed by copper catalyzed [3+2] cycloaddition reactions between the azido alcohols and methyl propiolate and subsequent ester aminolysis with primary and secondary amines furnished the target compounds, which were obtained in excellent yields with no racemization. Docking of selected target compounds shows that the chiral 1,4-disubstituted-1,2,3-triazoles derivatives has the potential of mimicking the binding mode of known purine analogues.

  4. Crystal structure of (E-1-(4-chlorophenylethanone O-dehydroabietyloxime

    Directory of Open Access Journals (Sweden)

    Jian-Qiang Zheng

    2014-09-01

    Full Text Available The title compound, C28H34ClNO2 {systematic name: (E-1-(4-chlorophenylethanone O-[(1R,4aS,10aR-7-isopropyl-1,4a-dimethyl-1,2,3,4,4a,9,10,10a-octahydrophenanthrene-1-carbonyl]oxime}, was synthesized from dehydroabietic acid. In the dehydroabietyl moiety, the central and terminal cyclohexane rings display chair and half-chair conformations, respectively, and a trans-ring junction. The C=N bond is in an E conformation and the C—O—N=C torsion angle is 148.1 (5°. No directional interactions except van der Waals contacts occur in the crystal structure.

  5. Crystal structure, NMR and theoretical investigations on 2-( o-hydroxy-anilino)-1,4-napthoquinone

    Science.gov (United States)

    Feizi, Nourollah; Pinjari, Rahul V.; Gejji, Shridhar P.; Sayyed, Fareed B.; Gonnade, Rajesh; Rane, Sandhya Y.

    2010-03-01

    Crystal structure, 1H NMR and cyclic voltammetric investigations of 2-( o-hydroxy-anilino)-1,4-napthoquinone (HAN), resulting from coupling of aminophenol with 2-hydroxy-1,4-napthoquinone, have been carried out. X-ray structure reveals that the HAN ligand crystallizes in orthorhombic space group Pca2 1 with Z = 4, forming a chain via inter-molecular O2⋯H1A sbnd O1 and C15 sbnd H15⋯O3 interactions. Both 1H NMR and cyclic voltammetry experiments suggest the titled ligand is associated and exists as dimer in d6-DMSO while the monomer has been predicted in CDCl 3 solution. Density functional calculations can be utilized to gauge the strength of hydrogen-bonded interactions from the 1H chemical shifts in the NMR spectra. Self-consistent reaction field (SCRF) calculations further support the inferences drawn from cyclic voltammetry experiments.

  6. Proton transfer from 1,4-pentadiene to superoxide radical anion: a QTAIM analysis

    Directory of Open Access Journals (Sweden)

    Angela Rodríguez-Serrano

    2014-04-01

    Full Text Available We studied the bis-allylic proton transferreaction from 1,4-pentadiene to superoxideradical anion (O2·־. Minima andtransition state geometries, as well asthermochemical parameters were computedat the B3LYP/6-311+G(3df,2plevel of theory. The electronic wavefunctions of reactants, intermediates,and products were analyzed within theframework of the Quantum Theory ofAtoms in Molecules. The results showthe formation of strongly hydrogen bondedcomplexes between the 1,4-pentadien-3-yl anion and the hydroperoxylradical as the reaction products. Theseproduct complexes (PCs are more stablethan the isolated reactants and muchmore stable than the isolated products.This reaction occurs via pre-reactivecomplexes which are more stable thanthe PCs and the transition states. This isin agreement with the fact that the netproton transfer reaction that leads to freeproducts is an endothermic and nonspontaneousprocess.

  7. Quinoxaline 1,4-dioxide: a versatile scaffold endowed with manifold activities.

    Science.gov (United States)

    Carta, A; Corona, P; Loriga, M

    2005-01-01

    Since 1940s, Quinoxaline 1,4-dioxides (QdNO's) are known as potent antibacterial agents, and subtherapeutic levels have been used to promote growth and improve efficiency of feed conversion in animal feed. They have also shown a selective cytotoxicity against hypoxic cells present in solid tumours. Furthermore, recent studies have put in evidence that QdNO's are endowed with antitubercular, antiprotozoal and anticandida activities. On the other hand, several authors have reported about photoallergic and mutagenic effects of some derivatives. QdNO's may also cause the development of antibiotic-resistant bacteria and influence the horizontal transfer of virulence genes between bacteria. In this review article we report the biological properties, the mode of action and Structure Activity Relationship (SAR) studies of the QdNO derivatives. Furthermore, some cytogenetic and genotoxic effects, classical and more recent method of synthesis, the quinoxaline 1,4-dioxides, and some of their most important reactions, were also reported.

  8. Cyclization of 1,4-hydroxycarbonyls is not a homogenous gas phase process

    Science.gov (United States)

    Dibble, Theodore S.

    2007-10-01

    Previous studies of 1,4-hydroxycarbonyls derived from alkanes have suggested that they can cyclize to saturated furans, which can subsequently eliminate water to form the corresponding dihydrofurans. CBS-QB3 and G3 studies of 5-hydroxy-2-pentanone and 2-hydroxypentanal show that both steps have activation barriers far too large for these reactions to occur as homogenous gas phase reactions. Similar results were obtained in CBS-QB3 studies of the analogous process leading from 2- and 3-methyl-4-hydroxy-2-butenal (species posited to form in the degradation of isoprene) to 3-methylfuran. The latter two processes are much more favorable, thermodynamically, than the formation of dihydrofurans from the saturated 1,4-hydroxycarbonyls.

  9. Cloning and characterization of a novel member of human β-1,4-galactosyltransferase gene family

    Institute of Scientific and Technical Information of China (English)

    范玉新; 余龙; 张琪; 江萤; 戴方彦; 陈驰原; 屠强; 毕安定; 许月芳; 赵寿元

    1999-01-01

    By using the EST strategy for identifying novel members belonging to homologous gene families, a novel full-length cDNA encoding a protein significantly homologous to UDP-Gal: N-acetylglucosamine β-1, 4-galactosyltransferase (GAlT) was isolated from a human testis cDNA library. A nucleotide sequence of 2 173 bp long was determined to contain an open reading frame of 1032 nucleotides (344 amino acids). In view of the homology to members of the galactosyltransferase gene family and especially the closest relationship to Gallus gallus GalT type I (CK I), the predicted product of the novel cDNA was designated as human β-1, 4-galactosyltransferase homolog I (HumGT-H1). Its mRNA is present in different degrees in 16 tissues examined. Southern analysis of human genomic DNA revealed its locus on chromosome 3.

  10. Cancer Cell Cytotoxicities of 1-(4-Substitutedbenzoyl-4-(4-chlorobenzhydrylpiperazine Derivatives

    Directory of Open Access Journals (Sweden)

    Mine Yarim

    2012-06-01

    Full Text Available A series of novel 1-(4-substitutedbenzoyl-4-(4-chlorobenzhydrylpiperazine derivatives 5ag was designed by a nucleophilic substitution reaction of 1-(4-chlorobenzhydrylpiperazine with various benzoyl chlorides and characterized by elemental analyses, IR and 1H nuclear magnetic resonance spectra. Cytotoxicity of the compounds was demonstrated on cancer cell lines from liver (HUH7, FOCUS, MAHLAVU, HEPG2, HEP3B, breast (MCF7, BT20, T47D, CAMA-1, colon (HCT-116, gastric (KATO-3 and endometrial (MFE-296 cancer cell lines. Time-dependent cytotoxicity analysis of compound 5a indicated the long-term in situ stability of this compound. All compounds showed significant cell growth inhibitory activity on the selected cancer cell lines.

  11. Synthesis of new 2-aminocarbohydrate-1,4-naphthoquinone derivatives promoted by ultrasonic irradiation

    Energy Technology Data Exchange (ETDEWEB)

    Franco, Caroline F.J.; Jordao, Alessandro K.; Ferreira, Vitor F.; Souza, Maria C.B.V. de; Cunha, Anna C., E-mail: annac@vm.uff.b [Universidade Federal Fluminense (UFF), Niteroi, RJ (Brazil). Inst. de Quimica. Dept. de Quimica Organica; Resende, Jackson A.L.C. [Universidade Federal Fluminense (UFF), Niteroi, RJ (Brazil). Dept. de Quimica Inorganica. Lab. Regional de Difracao de Raios X

    2011-07-01

    In this report we describe the ultrasound-accelerated synthesis of new naphthoquinone derivatives 6a-f and 7a-c, which possess an aminocarbohydrate chain at the C-2 position of the quinone ring. This novel type of 1,4-naphthoquinone derivative has been synthesized under mild conditions by the reaction of 1,4-naphthoquinone (8a) or methoxylapachol (8b) with different aminocarbohydrates 9a-d. Characterization of all substances was confirmed by one- and two-dimensional nuclear magnetic resonance (NMR) techniques ({sup 1}H, {sup 13}C-APT, cosy-1H vs. 1H and HETCOR {sup 1}J{sub CH}) and by high-resolution electrospray ionization mass spectrometry (HR ESI MS). (author)

  12. {sup 14}N NQR study of selected 1,4-benzoquinonedioximes

    Energy Technology Data Exchange (ETDEWEB)

    Singh, N., E-mail: nadiabeepath@hotmail.com; Stephenson, D., E-mail: david.stephenson@sta.uwi.edu [University of the West Indies, Chemistry Department (Trinidad and Tobago)

    2010-04-15

    The {sup 14}N NQR frequencies of selected 1,4-benzoquinonedioximes were measured using cross relaxation double resonance. As the number of substituents increase, a significant shift in the NQR values is observed. Comparison of unsubstituted and tri-substituted 1,4-benzoquinonedioximes shows that the quadrupole coupling constant ({chi}) increases by about 1000 kHz and the asymmetry parameter ({eta}) decreases from Almost-Equal-To 0.7 to 0.3 respectively. Ab-initio calculations show that for the unsubstituted compound hydrogen bonding between oxime groups and pi-ring stacking is possible which cannot be accommodated for in heavily methyl substituted dioximes and this results in distinct NQR parameters.

  13. One-dimensional supramolecular surface structures: 1,4-diisocyanobenzene on Au(111) surfaces

    Energy Technology Data Exchange (ETDEWEB)

    Boscoboinik, Jorge [University of Wisconsin, Milwaukee; Calaza, Florencia C [ORNL; Habeeb, Zeesham [University of Wisconsin, Milwaukee; Bennett, Dennis [University of Wisconsin, Milwaukee; Stacchiola, Dario [Michigan Technological University; Purino, Martin [Universidad de La Laguna, Tenerife-Canary Islands, Spain; Tysoe, Wilfred [University of Wisconsin, Milwaukee

    2010-01-01

    One-dimensional supramolecular structures formed by adsorbing low coverages of 1,4-diisocyanobenzene on Au(111) at room temperature are obtained and imaged by scanning tunneling microscopy (STM) under ultrahigh vacuum (UHV) conditions. The structures originate from step edges or surface defects and arrange predominantly in a straight fashion on the substrate terraces along the h110i directions. They are proposed to consist of alternating units of 1,4-diisocyanobenzene molecules and gold atoms with a unit cell in registry with the substrate corresponding to four times the lattice interatomic distance. Their long 1-D chains and high thermal stability offer the potential to use them as conductors in nanoelectronic applications.

  14. Sigma-1 receptor agonists directly inhibit Nav1.2/1.4 channels.

    Directory of Open Access Journals (Sweden)

    Xiao-Fei Gao

    Full Text Available (+-SKF 10047 (N-allyl-normetazocine is a prototypic and specific sigma-1 receptor agonist that has been used extensively to study the function of sigma-1 receptors. (+-SKF 10047 inhibits K(+, Na(+ and Ca2+ channels via sigma-1 receptor activation. We found that (+-SKF 10047 inhibited Na(V1.2 and Na(V1.4 channels independently of sigma-1 receptor activation. (+-SKF 10047 equally inhibited Na(V1.2/1.4 channel currents in HEK293T cells with abundant sigma-1 receptor expression and in COS-7 cells, which barely express sigma-1 receptors. The sigma-1 receptor antagonists BD 1063,BD 1047 and NE-100 did not block the inhibitory effects of (+-SKF-10047. Blocking of the PKA, PKC and G-protein pathways did not affect (+-SKF 10047 inhibition of Na(V1.2 channel currents. The sigma-1 receptor agonists Dextromethorphan (DM and 1,3-di-o-tolyl-guanidine (DTG also inhibited Na(V1.2 currents through a sigma-1 receptor-independent pathway. The (+-SKF 10047 inhibition of Na(V1.2 currents was use- and frequency-dependent. Point mutations demonstrated the importance of Phe(1764 and Tyr(1771 in the IV-segment 6 domain of the Na(V1.2 channel and Phe(1579 in the Na(V1.4 channel for (+-SKF 10047 inhibition. In conclusion, our results suggest that sigma-1 receptor agonists directly inhibit Na(V1.2/1.4 channels and that these interactions should be given special attention for future sigma-1 receptor function studies.

  15. An expedient synthesis of functionalized 1,4-diketone-derived compounds via silyloxyallyl cation intermediates.

    Science.gov (United States)

    Stepherson, Jacob R; Fronczek, Frank R; Kartika, Rendy

    2016-02-07

    Herein we describe a new method, enabling the synthesis of highly functionalized 1,4-diketones that are readily differentiated as monosilylenol ethers under Brønsted acid catalysis. This synthetically useful chemistry exploited an intermediacy of unsymmetrical silyloxyallyl cations, which were directly captured by silyl enolates to create the targeted α,α carbon-carbon linkages in a regioselective manner. Our reaction conditions proved to be mild, rendering the silylenol ether functionalities intact.

  16. Molecular structure and polymorphism of a cyclohexanediol: trans-1,4-cyclohexanedimethanol

    OpenAIRE

    Rosado, Mário T. S.; Maria, Teresa M. R.; Castro, Ricardo A. E.; Canotilho, João; Silva, Manuela Ramos; Eusébio,M. Ermelinda S.

    2014-01-01

    This study aims to investigate the molecular structure and polymorphism of trans-1,4-cyclohexanedimethanol, including the bi-axial/bi-equatorial equilibrium and the nature of the intermolecular H-bond networks in condensed phases created by the hydroxyl group torsions. The full conformational space of the single molecule was explored by MP2 calculations, showing that the optimized bi-equatorial conformers have similar stability and the bi-axial ones have much higher energies. The ...

  17. Polymorphism in chloro derivatives of 1,4-naphthoquinone: Experiment and density functional theoretic investigations

    Science.gov (United States)

    Chaudhari, Dinkar; Gejji, Shridhar P.; Lande, Dipali N.; Chakravarty, Debamitra; Salunke-Gawali, Sunita

    2016-09-01

    Molecular interactions underlying polymorphs of chlorine containing 1,4-naphthoquinone derivatives have been investigated by employing single crystal X-ray, 1H NMR, FTIR and electronic spectra experiments combined with density functional theory. Two polymorphs of 2,3-dichloro-1,4-naphthoquinone possessing (i) triclinic space group P-1(A1 and A3), and (ii) orthorhombic with Pb21a (A2) space group were obtained. The polymorph A3 has two molecules in its asymmetric unit which facilitate Csbnd H⋯O interactions engendeing polymeric planar sheets. The two polymorphs of 2-amino-3-chloro-1,4-naphthoquinone reveal monoclinic forms with Pc (B1) and C2/C (B2) space groups. A tetramer of B2 molecule possess Nsbnd H⋯O interactions. The polymorphs of 2-chloro-3-hydroxy-1,4-naphthoquinone crystallizes in monoclinic space groups Pc (C1) and Pn (C2). Polymeric chain of C2 molecules results via Osbnd H⋯O interactions and the chains further are connected through Csbnd H⋯Cl and π-π stacking interactions those arise from benzenoid and quinonoid centroid. Moreover A3 facilitates the dimer via the halogen bonding interactions. Furthermore hydrogen bonding renders stability to the dimer C2. On the other hand compound B2 does not favor dimer formation. These inferences based on experimental observations are rationalized through the use of the dispersion corrected M06-2x functional based density functional theory. Further time dependent density functional theory has been used to assign the electronic transitions in UV-visible spectra of A3, B2 and C2.

  18. Synthesis and antitumor activities of novel 1,4-substituted phthalazine derivatives

    Institute of Scientific and Technical Information of China (English)

    Shu Lan Zhang; Ya Jing Liu; Yan Fang Zhao; Qiu Ting Guo; Ping Gong

    2010-01-01

    A series of 1,4-substituted phthalazine derivatives were designed and synthesized.All the prepared compounds were screened for their cytotoxic activities against A549,HT-29 and MDA-MB-231 cell lines in vitro.Among them,compounds 7a-7h showed excellent selectivity for MDA-MB-231 cell line with IC50 values from 1 nmol/L to 0.92 μmol/L.A preliminary SAR study of these derivatives was performed.

  19. Magnetic phenomena at and near nu = 1 / 2 and 1 / 4: theory, experiment, and interpretation

    Science.gov (United States)

    Shankar

    2000-04-24

    I show that the Hamiltonian theory of composite fermions is capable of yielding a unified description in fair agreement with recent experiments on polarization P and relaxation rate 1/T1 in quantum Hall states at filling nu = p/(2ps+1), at and near nu = 1 / 2 and 1 / 4 ( s = 1,2) at zero and nonzero temperatures. I show how rotational invariance and two dimensionality can make the underlying interacting theory behave like a free one in a limited context.

  20. A convenient approach to fused indeno-1,4-diazepinones through hypervalent iodine chemistry.

    Science.gov (United States)

    Malamidou-Xenikaki, Elizabeth; Spyroudis, Spyros; Tsanakopoulou, Maria; Hadjipavlou-Litina, Dimitra

    2009-10-02

    Indenocarboxamides, resulting from the sequential addition of two arylamine equivalents to indanedione ketene dimer, are oxidized by [bis(trifluoroacetoxy)iodobenzene] to fused indeno-1,4-diazepinones in yields depending on the substituents on both aromatic rings. A plausible reaction pathway explaining the formation of the title compounds, as well as the formation of the two other minor products of the reaction, through a common intermediate, is suggested.

  1. Palladium-catalyzed 1,4-difunctionalization of butadiene to form skipped polyenes.

    Science.gov (United States)

    McCammant, Matthew S; Liao, Longyan; Sigman, Matthew S

    2013-03-20

    A palladium-catalyzed 1,4-addition across the commodity chemical 1,3-butadiene to afford skipped polyene products is reported. Through a palladium σ → π → σ allyl isomerization, two new carbon-carbon bonds are formed with high regioselectivity and trans stereoselectivity of the newly formed alkene. The utility of this method is highlighted by the successful synthesis of the ripostatin A skipped triene core.

  2. e,e-trans-Cyclohexane-1,4-carboxylic acid–hexamethylenetetramine (1/2

    Directory of Open Access Journals (Sweden)

    Andreas Lemmerer

    2011-02-01

    Full Text Available The asymmetric unit of the title compound, 2C6H12N4·C8H12O4, contains one half-molecule of e,e-trans-cyclohexane-1,4-dicarboxylic acid (the complete molecule being generated by inversion symmetry and one molecule of hexamethylenetetramine (HMTA, which are connected by O—H...N hydrogen bonds. This forms isolated trimers that pack in a herringbone fashion.

  3. Quinoxaline 1,4-di-N-Oxides: Biological Activities and Mechanisms of Actions

    OpenAIRE

    Cheng, Guyue; Sa, Wei; Cao, Chen; Guo, Liangliang; Hao, Haihong; Liu, Zhenli; Wang, Xu; Yuan, Zonghui

    2016-01-01

    Quinoxaline 1,4-di-N-oxides (QdNOs) have manifold biological properties, including antimicrobial, antitumoral, antitrypanosomal and antiinflammatory/antioxidant activities. These diverse activities endow them broad applications and prospects in human and veterinary medicines. As QdNOs arouse widespread interest, the evaluation of their medicinal chemistry is still in progress. In the meantime, adverse effects have been reported in some of the QdNO derivatives. For example, genotoxicity and ba...

  4. Thermal and structural study on the lattice compound 1,4-diammoniumbutane bis(theophyllinate)

    Energy Technology Data Exchange (ETDEWEB)

    Ban, Margit; Madarasz, Janos; Bombicz, Petra; Pokol, Gyoergy; Gal, Sandor

    2004-10-01

    Crystalline title compound (1) prepared from aqueous solution of theophylline and 1,4-diaminobutane has been structurally and thermally characterized. Both the two-step TG decomposition curve and elemental analysis of the hexagonal crystals show that it consists of theophylline and 1,4-diaminobutane in 2:1 molar ratio. Actually, presence of one type of both theophyllinate anions and 1,4-diammoniumbutane dication have been indicated by FTIR spectroscopy. The molecular structure of lattice compound (1) has been determined by single crystal X-ray diffraction, where the hydrogen positions have been obtained from differential Fourier maps. It has confirmed that the crystal is really built up from these ionic constituents bound together with an extensive net of hydrogen bonds. The coupled TG-FTIR analysis of the evolved gases has revealed that the diamine is released as a whole molecule in the first decomposition step. Clathrate 1 and the proton migration in it might serve as a structural model of solid aminophylline whose crystal structure is still unknown.

  5. 1, 4-alpha-Glucan phosphorylase from Klebsiella pneumoniae purification, subunit structure and amino acid composition.

    Science.gov (United States)

    Linder, D; Kurz, G; Bender, H; Wallenfels, K

    1976-11-01

    1. A 1,4-alpha-glucan phosphorylase from Klebsiella pneumoniae has been purified about 80-fold with an over-all yield greater than 35%. The purified enzyme has been shown to be homogeneous by gel electrophoresis at different pH-values, by isoelectric focusing, by dodecylsulfate electrophoresis and by ultracentrifugation. 2. The molecular weight of the native enzyme has been determined to be 180 000 by ultra-centrifugation studies, in good agreement with the value of 189 000 estimated by gel permeation chromatography. 3. The enzyme dissociates in the presence of 0.1% dodecylsulfate or 5 M guanidine hydrochloride into polypeptide chains. The molecular weight of these polypeptide chains has been found to be 88 000 by dodecylsulfate polyacrylamide gel electrophoresis and 99 000 by sedimentation equilibrium studies, indicating that the native enzyme is composed of two polypeptide chains. 4. The enzyme contains pyridoxalphosphate with a stoichiometry of two moles per 180 000 g protein, confirming that the 1,4-alpha-glucan phosphorylase from Klebsiella pneumoniae is a dimeric enzyme. 5. The amino acid composition of the enzyme has been determined, and its correspondence to that of 1,4-alpha-glucan phosphorylases from other sources is discussed. 6. The pI of the enzyme has been shown to be 5.3 and its pH-optimum to be about pH 5.9. The enzyme is stable in the range from pH 5.9 to 10.5.

  6. Preparation of Chiral 1,4-Phenylene-silicas via Chiral Low-molecular-weight Amphiphiles

    Institute of Scientific and Technical Information of China (English)

    XIAO Min; LIU Xiao-juan; HU Kai; WU Li-min; LI Yi; LI Bao-zong; YANG Yong-gang

    2012-01-01

    Chiral organic-inorganic hybrid silicas can be prepared via the self-assemblies of chiral surfactants and gelators as templates.However,the relationship between the chirality of the hybrid silica and the structure of the surfactant/gelator has not been systemically studied.Herein,a series of chiral low-molecular-weight amphiphiles(LMWAs) derived from L-valine was synthesized.Their alkyl chains were n-butadecyl,n-hexadecyl and n-octadecyl,respectively.They can form viscous liquids in pure water,and physical gels in tetrahydrofuran,cyclohexanone,acetonitrile,acetone,chlorobenzene and nitrobenzenc.Chiral 1,4-phenylene-silicas were prepared via the self-assemblies of these LMWAs as templates.With increasing the alkyl chain length,the 1,4-phenylene-silicas changed from short mesoporous nanorods to long nanotubcs. The circular dichroism spectra of the 1,4-phenylene-silicas indicated that the long nanotubes exhibit the strongest chirality.

  7. Biotechnological tools to improve bioremediation of phenol by Acinetobacter sp. RTE1.4.

    Science.gov (United States)

    Paisio, Cintia E; Talano, Melina A; González, Paola S; Magallanes-Noguera, Cynthia; Kurina-Sanz, Marcela; Agostini, Elizabeth

    2016-09-01

    The use of native bacteria is a useful strategy to decontaminate industrial effluents as well as the environment. Acinetobacter sp. RTE1.4 was previously isolated from polluted environments and constitutes a promising alternative for this purpose due to its capability to remove phenol from synthetic solutions and industrial effluents. In this work, this strain was identified at species level as A. tandoii RTE1.4. Phenol degradation pathway was studied and some reaction intermediates were detected, confirming that this strain degraded phenol through ortho-cleavage of the aromatic ring. Phenol removal assays were carried out in a stirred tank bioreactor and a complete degradation of the contaminant was achieved after only 7 h, at an aeration rate of 3 vvm and at agitation of 600 rpm. Moreover, this bacterium was immobilized into calcium alginate beads and an increase in phenol biodegradation with respect to free cells was observed. The immobilized cells were reused for four consecutive cycles and stored at 4°C for 9 months, during which phenol removal efficiency was maintained. Post-removal solutions were evaluated by Microtox® test, showing a toxicity reduction after bacterial treatment. These findings demonstrated that A. tandoii RTE1.4 might be considered as a useful biotechnological tool for an efficient treatment of different solutions contaminated with phenol in bioreactors, using either free or immobilized cells.

  8. Prediction of turnover number of cellulose 1,4-beta-cellobiosidase.

    Science.gov (United States)

    Yan, Shaomin; Wu, Guang

    2013-03-01

    The turnover number is an important parameter to distinguish whether an enzyme is practically workable. Therefore the prediction of turnover number of enzyme will reduce the workload to conduct time-consuming and costly experiments to determine the turnover number. However, no studies have been so far conducted to predict them with respect to cellulose 1,4-beta-cellobiosidase, which is an enzyme used in industries, especially in bio-fuel industry. It is important to develop methods to predict the turnover numbers of cellulose 1,4-beta-cellobiosidases from both wild-type and mutations. In this study, we used neural network models with different amino acid properties, pH levels, temperatures and substrates as inputs to predict the turnover number. The results show that 11 out of 25 amino acid properties analyzed can work as predictor and the amino acid distribution probability is the best one because it can reach smaller mean squared errors during convergence and higher correlation coefficient in two-layer neural network models. This study demonstrates the probability that the neural network model can approximately predict the turnover number of cellulose 1,4-betacellobiosidase.

  9. Molluscicidal activity of 2-hydroxy-[1,4]naphthoquinone and derivatives

    Directory of Open Access Journals (Sweden)

    Celso A. Camara

    2008-06-01

    Full Text Available The toxic profile of lawsone (2-hydroxy-[1,4]naphthoquinone and a series of [1,4]naphthoquinone derivatives was evaluated against the brine shrimp Artemia salina and against the mollusk Biomphalaria glabrata, the main transmitting vector of schistosomiasis in Brazil. Of the seventeen compounds tested nine fell below the threshold of 100 µg/mL set for potential molluscicidal activity by the World Health Organization. As a general rule derivatives with non-polar substituents presented the highest molluscicidal activities. These substances showed significant toxicity in A. salina lethality bioassay.A toxicidade da lausona (2-hidroxi-1,4-naftoquinona e de diversos derivados foi avaliada frente à Artemia salina e ao molusco Biomphalaria glabrata, o principal vetor de transmissão da esquistossomose no Brasil. Entre os dezessete compostos testados, nove apresentaram um perfil de toxicidade menor que 100 µg/mL, sendo potenciais agentes moluscicidas de acordo com as designações da Organização Mundial da Saúde. No presente estudo, os compostos contendo substituintes apolares exibiram as maiores atividades. Estes compostos também se mostraram significantemente tóxicos frente à A. salina.

  10. Thermodynamics of the Hydrolysis Reactions of 1,4-beta-D-xylobiose, 1,4-beta-D-xylotriose, D-cellobiose, and D-Maltose

    Energy Technology Data Exchange (ETDEWEB)

    Tewari, Y. B.; Lang, B. E.; Decker, S. R.; Goldberg, R. N.

    2008-10-01

    Microcalorimetry and high-performance liquid chromatography have been used to conduct a thermodynamic investigation of the following reactions: (1) 1,4-{beta}-Dxylobiose(aq)+H{sub 2}O(I)=2D-xylose(aq); (2) 1,4-{beta}-D-xylotriose+2H{sub 2}O(I)=3D-xylose(aq); (3) D-maltose(aq)+H{sub 2}O(I)=2{alpha}-D-glucose(aq); and (4) D-cellobiose(aq)+H{sub 2}O(I)=2{alpha}-D-glucose(aq). The results of the equilibrium measurements were K = (1.46 {+-} 0.15) {center_dot} 10{sup 3} for reaction (1) and K = (551 {+-} 34) for reaction (3). Although it was not possible to measure directly a value for the equilibrium constant for reaction (4), it was possible to obtain the value K = 657 for this reaction via a thermochemical pathway calculation. The results of the calorimetric measurements were standard enthalpies of reaction {Delta}{sub r}H{sup o} = (0.12 {+-} 0.26) kJ {center_dot} mol{sup -1} for reaction (1) and {Delta}{sub r}H{sup o} = -(0.06 {+-} 0.18) kJ {center_dot} mol{sup -1} for reaction (2). It is noted that values of {Delta}{sub r}H{sup o} for reactions (1) and (2) are equal to each other within their respective experimental errors. This fact is consistent with earlier observations that, for reactions involving the making/breaking of N saccharide linkages, the assignment of characteristic values of {Delta}{sub r}H{sup o}/N or {Delta}{sub r}G{sup o}/N or {Delta}{sub r}S{sup o}/N for a specified linkage, is accurate in predicting the values of {Delta}{sub r}H{sup o}, {Delta}{sub r}G{sup o}, and {Delta}{sub r}S{sup o} for reactions involving saccharides that contain multiples or combinations of such linkages. Also, the values of the standard entropy changes {Delta}{sub r}S{sup o} for the hydrolysis reactions (3) and (4) fall into the range of values {l_brace}(32 to 48) J {center_dot} K{sup -1} {center_dot} mol{sup -1}{r_brace} previously noted for the hydrolysis of six-carbon disaccharides. In order to tie the results of this study into the thermochemical literature, a reaction

  11. Thermodynamics of the hydrolysis reactions of 1,4-{beta}-D-xylobiose, 1,4-{beta}-D-xylotriose, D-cellobiose, and D-maltose

    Energy Technology Data Exchange (ETDEWEB)

    Tewari, Yadu B. [Biochemical Science Division, National Institute of Standards and Technology, Gaithersburg, MD 20876 (United States)], E-mail: yadu.tewari@nist.gov; Lang, Brian E. [Biochemical Science Division, National Institute of Standards and Technology, Gaithersburg, MD 20876 (United States)], E-mail: brian.lang@nist.gov; Decker, Stephen R. [National Renewable Energy Laboratory, Chemical and Biosciences Center, 1617 Cole Boulevard, Golden, CO 80401 (United States)], E-mail: steve_decker@nrel.gov; Goldberg, Robert N. [Biochemical Science Division, National Institute of Standards and Technology, Gaithersburg, MD 20876 (United States); Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, MD 21250 (United States)], E-mail: robert.goldberg@nist.gov

    2008-10-15

    Microcalorimetry and high-performance liquid chromatography have been used to conduct a thermodynamic investigation of the following reactions: (1)1,4-{beta}-D-xylobiose(aq)+H{sub 2}O(l)=2D-xylose(aq), (2)1,4-{beta}-D-xylotriose+2H{sub 2}O(l)=3D-xylose(aq), (3)D-maltose(aq)+H{sub 2}O(l)=2{alpha}-D-glucose(aq), (4)D-cellobiose(aq)+H{sub 2}O(l)=2{alpha}-D-glucose(aq). The results of the equilibrium measurements were K = (1.46 {+-} 0.15) . 10{sup 3} for reaction (1) and K = (551 {+-} 34) for reaction (3). Although it was not possible to measure directly a value for the equilibrium constant for reaction (4), it was possible to obtain the value K = 657 for this reaction via a thermochemical pathway calculation. The results of the calorimetric measurements were standard enthalpies of reaction {delta}{sub r}H{sup 0} = (0.12 {+-} 0.26) kJ . mol{sup -1} for reaction (1) and {delta}{sub r}H{sup 0} = -(0.06 {+-} 0.18) kJ . mol{sup -1} for reaction (2). It is noted that values of {delta}{sub r}H{sup 0} for reactions (1) and (2) are equal to each other within their respective experimental errors. This fact is consistent with earlier observations that, for reactions involving the making/breaking of N saccharide linkages, the assignment of characteristic values of {delta}{sub r}H{sup 0}/N or {delta}{sub r}G{sup 0}/N or {delta}{sub r}S{sup 0}/N for a specified linkage, is accurate in predicting the values of {delta}{sub r}H{sup 0}, {delta}{sub r}G{sup 0}, and {delta}{sub r}S{sup 0} for reactions involving saccharides that contain multiples or combinations of such linkages. Also, the values of the standard entropy changes {delta}{sub r}S{sup 0} for the hydrolysis reactions (3) and (4) fall into the range of values {l_brace}(32 to 48) J . K{sup -1} . mol{sup -1}){r_brace} previously noted for the hydrolysis of six-carbon disaccharides. In order to tie the results of this study into the thermochemical literature, a reaction catalog of related property values was created. Selected

  12. Staging Sociotechnical Spaces

    DEFF Research Database (Denmark)

    Clausen, Christian; Yoshinaka, Yutaka

    2007-01-01

    The management of innovation and product development is increasingly facing complex challenges of staging design processes across heterogeneous organisational spaces, with multiple actor-concerns and sources of knowledge. This paper addresses how insights from the Actor-Network Theory and political...... process theory may contribute to a reflexive understanding of design as the staging of socio-technical relations and processes cutting across boundaries of diverse organisational, political and knowledge domains. This idea is pursued through the notion of ‘socio-technical spaces’. Socio-technical space...... of product development. The concept of socio-technical spaces is further illustrated through actual examples from industry dealing with early conceptualisation in product development and the role played by management concepts in the configuration of spaces....

  13. Calibration of Nanopositioning Stages

    Directory of Open Access Journals (Sweden)

    Ning Tan

    2015-12-01

    Full Text Available Accuracy is one of the most important criteria for the performance evaluation of micro- and nanorobots or systems. Nanopositioning stages are used to achieve the high positioning resolution and accuracy for a wide and growing scope of applications. However, their positioning accuracy and repeatability are not well known and difficult to guarantee, which induces many drawbacks for many applications. For example, in the mechanical characterisation of biological samples, it is difficult to perform several cycles in a repeatable way so as not to induce negative influences on the study. It also prevents one from controlling accurately a tool with respect to a sample without adding additional sensors for closed loop control. This paper aims at quantifying the positioning repeatability and accuracy based on the ISO 9283:1998 standard, and analyzing factors influencing positioning accuracy onto a case study of 1-DoF (Degree-of-Freedom nanopositioning stage. The influence of thermal drift is notably quantified. Performances improvement of the nanopositioning stage are then investigated through robot calibration (i.e., open-loop approach. Two models (static and adaptive models are proposed to compensate for both geometric errors and thermal drift. Validation experiments are conducted over a long period (several days showing that the accuracy of the stage is improved from typical micrometer range to 400 nm using the static model and even down to 100 nm using the adaptive model. In addition, we extend the 1-DoF calibration to multi-DoF with a case study of a 2-DoF nanopositioning robot. Results demonstrate that the model efficiently improved the 2D accuracy from 1400 nm to 200 nm.

  14. Synthesis, Characterization, and Biodegradation Studies of Poly(1,4-cyclohexanedimethylene-adipate-carbonates

    Directory of Open Access Journals (Sweden)

    Ajay S. Chandure

    2014-01-01

    Full Text Available Aliphatic/alicyclic poly(1,4-cyclohexanedimethylene-adipate-carbonates (PCACs were synthesized by a transesterification from 1,4-cyclohexamethylendimethanol (1,4-CHDM, adipic acid (AA, diethyl carbonate (DEC, and titanium butoxide Ti(OBu4 as a transesterification catalyst. The synthesized PCACs were characterized by the Fourier transform infrared (FTIR, X-ray diffraction analysis (XRD, solubility, solution viscosity, gel permeation chromatography (GPC, differential scanning calorimetry (DSC, thermogravimetric analysis (TGA, and scanning electron microscope (SEM for their structural, physical, thermal, and morphological investigation. The structure of synthesized PCACs was confirmed by FTIR. All TGA curves of PCACs shows 10% weight loss above 270°C, and they reveal good thermal stability. Biodegradability of PCACs was investigated by hydrolytic degradation at (pH 7.2 and 11.5, enzymatic degradation using Rhizopus delemar lips at 37°C in phosphate buffer solution (PBS, and soil burial degradation at 30°C. The hydrolytic degradation shows the greater rate of weight loss in PBS at pH-11.5 than pH-7.2. The hydrolytic and soil burial degradation shows faster rate of weight loss as compared to enzymatic degradation. Biodegradation rate of PCACs follows the order: PCAC-20 > PCAC-40 > PCAC-60. SEM images show that degradation occurred all over the film surface, creating holes and cracks. These biodegradable PCACs may be able to replace conventional polymer in the fabrication of packaging film in near future.

  15. A shock tube and theoretical study on the pyrolysis of 1,4-dioxane.

    Science.gov (United States)

    Yang, X; Jasper, A W; Giri, B R; Kiefer, J H; Tranter, R S

    2011-03-07

    The dissociation of 1, 2 and 4% 1,4-dioxane dilute in krypton was studied in a shock tube using laser schlieren densitometry, LS, for 1550-2100 K with 56 ± 4 and 123 ± 3 Torr. Products were identified by time-of-flight mass spectrometry, TOF-MS. 1,4-dioxane was found to initially dissociate via C-O bond fission followed by nearly equal contributions from pathways involving 2,6 H-atom transfers to either the O or C atom at the scission site. The 'linear' species thus formed (ethylene glycol vinyl ether and 2-ethoxyacetaldehyde) then dissociate by central fission at rates too fast to resolve. The radicals produced in this fission break down further to generate H, CH(3) and OH, driving a chain decomposition and subsequent exothermic recombination. High-level ab initio calculations were used to develop a potential energy surface for the dissociation. These results were incorporated into an 83 reaction mechanism used to simulate the LS profiles with excellent agreement. Simulations of the TOF-MS experiments were also performed with good agreement for consumption of 1,4-dioxane. Rate coefficients for the overall initial dissociation yielded k(123Torr) = (1.58 ± 0.50) × 10(59) × T(-13.63) × exp(-43970/T) s(-1) and k(58Torr) = (3.16 ± 1.10) × 10(79) × T(-19.13) × exp(-51326/T) s(-1) for 1600 < T < 2100 K.

  16. Unilateral lag-screw technique for an isolated anterior 1/4 atlas fracture

    Directory of Open Access Journals (Sweden)

    Semih Keskil

    2016-01-01

    Full Text Available Study Design: Fractures of the atlas are classified based on the fracture location and associated ligamentous injury. Among patients with atlas fractures treated using external immobilization, nonunion of the fracture could be seen. Objective: Ideally, treatment strategy for an unstable atlas fracture would involve limited fixation to maintain the fracture fragments in a reduced position without restricting the range of motion (ROM of the atlantoaxial and atlantooccipital joints. Summary of Background Data: Such a result can be established using either transoral limited internal fixation or limited posterior lateral mass fixation. However, due to high infection risk and technical difficulty, posterior approaches are preferred but none of these techniques can fully address anterior 1/4 atlas fractures such as in this case. Materials and Methods: A novel open and direct technique in which a unilateral lag screw was placed to reduce and stabilize a progressively widening isolated right-sided anterior 1/4 single fracture of C 1 that was initially treated with a rigid cervical collar is described. Results: Radiological studies made after the surgery showed no implant failure, good cervical alignment, and good reduction with fusion of C 1 . Conclusions: It is suggested that isolated C 1 fractures can be surgically reduced and immobilized using a lateral compression screw to allow union and maintain both C 1-0 and C 1-2 motions, and in our knowledge this is the first description of the use of a lag screw to achieve reduction of distracted anterior 1/4 fracture fragments of the C1 from a posterior approach. This technique has the potential to become a valuable adjunct to the surgeon′s armamentarium, in our opinion, only for fractures with distracted or comminuted fragments whose alignment would not be expected to significantly change with classical lateral mass screw reduction.

  17. A new calmodulin-binding motif for inositol 1,4,5-trisphosphate 3-kinase regulation.

    Science.gov (United States)

    Franco-Echevarría, Elsa; Baños-Sanz, Jose I; Monterroso, Begoña; Round, Adam; Sanz-Aparicio, Julia; González, Beatriz

    2014-11-01

    IP3-3K [Ins(1,4,5)P3 3-kinase] is a key enzyme that catalyses the synthesis of Ins(1,3,4,5)P4, using Ins(1,4,5)P3 and ATP as substrates. Both inositides, substrate and product, present crucial roles in the cell. Ins(1,4,5)P3 is a key point in Ca2+ metabolism that promotes Ca2+ release from intracellular stores and together with Ins(1,3,4,5)P4 regulates Ca2+ homoeostasis. In addition, Ins(1,3,4,5)P4 is involved in immune cell development. It has been proved that Ca2+/CaM (calmodulin) regulates the activity of IP3-3K, via direct interaction between both enzymes. Although we have extensive structural knowledge of the kinase domains of the three IP3-3K isoforms, no structural information is available about the interaction between IP3-3K and Ca2+/CaM. In the present paper we describe the crystal structure of the complex between human Ca2+/CaM and the CaM-binding region of human IP3-3K isoform A (residues 158-183) and propose a model for a complex including the kinase domain. The structure obtained allowed us to identify all of the key residues involved in the interaction, which have been evaluated by site-directed mutagenesis, pull-down and fluorescence anisotropy experiments. The results allowed the identification of a new CaM-binding motif, expanding our knowledge about how CaM interacts with its partners.

  18. ELEFUNT test results under X1. 4 on the Encore Multimax

    Energy Technology Data Exchange (ETDEWEB)

    Cody, W.J.

    1986-04-01

    Two libraries of Fortran test programs for elementary functions, MACHAR and ELEFUNT, were run on an Encore Multimax computer with 20 CPUs and 20 Megabytes of memory. The test program libraries were run under the X1.4 operating system (a version of 4.2 BSD UNIX). PARANOIA, an arithmetic test program, was run under the X1.2 operating system. Accuracy of the elementary functions, error detection, and error responses for the functions are discussed. 5 refs., 3 tabs. (DWL)

  19. Experimental and Theoretical Investigation of Valence Orbitals in 1,4-Dioxane by Electron momentum Spectroscopy

    Institute of Scientific and Technical Information of China (English)

    YANG Tie-Cheng; NING Chuan-Gang; SU Guo-Lin; DENG Jing-Kang; ZHANG Shu-Feng; REN Xue-Guang; HUANG Yan-Ru

    2006-01-01

    @@ The binding energy spectrum of all valence orbitals and the momentum distributions of highest occupied molecular orbital (HOMO: 8ag), 7bu + 7ag, 4bu, 2bg + 4ag and 2au in 1, 4-dioxane are investigated by electron momentum spectroscopy (EMS) with 600 e V impact energy. The experimental results are consistent with theoretical calculations of C2h chair conformation using the Hartree-Fock method and density functional theory with 6-311++G**and A UG-CC-PVTZ basis sets.

  20. 1/4 BPS Wilson Loop in beta-deformed Theories

    CERN Document Server

    Chu, Chong-Sun

    2007-01-01

    We consider general BPS Wilson loop operators in the N=1 beta-deformed supersymmetric Yang-Mills theory and derive the boundary condition satisfied by the dual string worldsheet. The boundary condition is found to be deformed and is characterized by the vielbein of the deformed supergravity metric. We also construct the string dual configuration for the 1/4 BPS Wilson loop operators. The string lies on a deformed three-sphere instead of a two-sphere as in the undeformed case. We compute the expectation value of the Wilson loop operator using the AdS/CFT correspondence and find that it is independent of the deformation.

  1. K-corona recording in the range < 1.4 Rsun

    CERN Document Server

    Kim, I S; Lisin, D V; Nasonova, L P

    2015-01-01

    Two approaches are suggested for recording the continuum corona in the range < 1.4 Rsun. They are different from the classical coronagraphic ones. Current state in the thin film technology allows discussing a new generation coronagraph with a variable transmission of an entrance aperture. The estimated coronagraphic factor is 2 orders of magnitude higher compared to a Lyot-type coronagraph. Another approach is based on the use of total solar eclipses at near-Mercury orbits. The instrumental background is decreased at least 3 orders of magnitude. That allows using a more simplified optical sketch.

  2. Structure of rat acidic fibroblast growth factor at 1.4 A resolution

    DEFF Research Database (Denmark)

    Kulahin, Nikolaj; Kiselyov, Vladislav; Kochoyan, Artur;

    2007-01-01

    Fibroblast growth factors (FGFs) constitute a family of 22 structurally related heparin-binding polypeptides that are involved in the regulation of cell growth, survival, differentiation and migration. Here, a 1.4 A resolution X-ray structure of rat FGF1 is presented. Two molecules are present in...... in the asymmetric unit of the crystal and they coordinate a total of five sulfate ions. The structures of human, bovine and newt FGF1 have been published previously. Human and rat FGF1 are found to have very similar structures....

  3. A New Class of Heterocycles: 1,4,3,5-Oxathiadiazepane 4,4-dioxides

    Directory of Open Access Journals (Sweden)

    Amel Bendjeddou

    2012-02-01

    Full Text Available This work reports the synthesis of novel 1,4,3,5-oxathiadiazepanes 4,4-dioxides from the reaction of N’-benzyl-N-(2-hydroxyethyl-sarcosine or proline sulfamide with aromatic aldehydes under acid catalysis. To prepare the starting materials N-Boc-sulfamide derivatives of sarcosine or proline were alkylated with benzyl alcohol under Mitsunobu reaction conditions, the Boc group was removed chemoselectively by acidolysis, and the resulting product reduced to the corresponding alcohol in good yields.

  4. Lipschitz equivalence of generalized {1,3,5}-{1,4,5} self-similar sets

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    This paper investigates the Lipschitz equivalence of generalized {1,3,5}-{1,4,5} self-similar sets D = (r1D) ∪ (r2D + (1 + r1 - r2 - r3)/2) ∪ (r3D + 1 - r3) and E = (r1E) ∪ (r2E + 1 - r2 -r3) ∪ (r3E + 1 - r3),and proves that D and E areLipschitz equivalent if and only if there are positive integers m and n such that rm1= rn3.

  5. The cytotoxic effect of 2-acylated-1,4-naphthohydroquinones on leukemia/lymphoma cells

    Science.gov (United States)

    Pedroza, Diego A.; De Leon, Fernando; Varela-Ramirez, Armando; Lema, Carolina; Aguilera, Renato J.; Mito, Shizue

    2014-01-01

    Here, we tested seven 2-acylated-1,4-hydronaphthoquinones for their cytotoxic effects on a panel of cancer lymphoma/leukemia cells and compared to a non-cancer origin cell line. Several naphthohydroquinones exhibited selective cytotoxic effects on lymphoma/leukemia cells with lowest activity on non-cancer cells. The mode of cell death induced by an acylated naphthohydroquinone, which has a long alkyl chain, was found to be via apoptosis. Furthermore, the naphthohydroquinone provoked mitochondria depolarization and activation of its downstream effector, caspase-3, thus implicating the intrinsic apoptotic pathway as its mechanism to exert cell death. PMID:24368029

  6. 1,4-Diazoniabicyclo[2.2.2]octane tetrachloridocadmate(II monohydrate

    Directory of Open Access Journals (Sweden)

    Tarek Ben Rhaiem

    2014-05-01

    Full Text Available The asymmetric unit of the title compound (C6H14N2[CdCl4]·H2O contained one 1,4-diazabicyclo[2.2.2]octane dication, a tetrahedral CdCl42− anion and a lattice water molecule. In the crystal, the solvate water molecule interacts with the cationic and anionic species via N—H...O and O—H...Cl [O...Cl = 3.289 (7 Å] hydrogen-bond interactions, respectively, leading to a layered supramolecular structure extending parallel to (011.

  7. Zirconium phosphonate/1,4,5,8-naphthalenediimides self-assembled films

    Directory of Open Access Journals (Sweden)

    MAGALI A. RODRIGUES

    2000-03-01

    Full Text Available The formation and characterization of self-assembled films of zirconium phosphonate / N,N'-di(2-phosphonoethyl-1,4,5,8-naphthalenediimide (DPN is presented. The films were produced on glass substrates by deposition of alternating layers of Zr+4 and DPN. Films containing up to 16 layers on each side of the substrate were obtained and monitored by absorption spectroscopy and ellipsometry. When irradiated, the initially colorless films turned to a persistent pinky color reminiscent of that of DPN anion radical. These films are a promising material to the development of photovoltaic devices.

  8. Poly[1,4-bis(ammoniomethylcyclohexane [di-μ-iodido-diiodidoplumbate(II

    Directory of Open Access Journals (Sweden)

    Matthew Kyle Rayner

    2010-06-01

    Full Text Available The title compound, {(C8H20N2[PbI4]}n, is an inorganic–organic hybrid. The structure is composed of alternate layers of two-dimensional corner-sharing PbI6 octahedra (overline{1} symmetry and 1,4-bis(ammoniomethylcyclohexane cations (overline{1} symmetry extending parallel to the bc plane. The cations interact with the inorganic layer via N—H...I hydrogen bonding in the right-angled halogen sub-type of the terminal halide hydrogen-bonding motif.

  9. Condensation Polymers of Terephthalic Acid and 1,4-Diaminobutane and Their Schiff Base Complexes

    Directory of Open Access Journals (Sweden)

    Sandeep Rai

    2013-01-01

    Full Text Available Amino-terminated oligomeric poly(tetramethylene terephthalamide (PTTA was prepared by condensation of terephthalic acid and 1,4-diaminobutane using phosphorylation technique. Schiff base complexes of this polyamide were synthesized with salicylaldehyde and 2-hydroxy-1-naphthaldehyde complexes of Co(II, Ni(II, and Cu(II. The polyamide as well as Schiff base complexes were characterized by elemental analysis, IR spectroscopy, and magnetic susceptibility measurements. Thermal stabilities of ligand and its various complexes were compared by thermogravimetric analysis.

  10. 1,4-Diazabicyclo[2.2.2]octane (DABCO 5-aminotetrazolates

    Directory of Open Access Journals (Sweden)

    Herwig Schottenberger

    2012-02-01

    Full Text Available The crystal structures of four salts of 1,4-diazabicyclo[2.2.2]octane (DABCO and 5-aminotetrazole are described. Anhydrous 1:1 (Pbca, Rgt = 0.041 and 1:2 (P, Rgt = 0.038 salts form hydrogen-bonded layers of anions and cations. The monohydrate of the 1:1 compound (P21/c, Rgt = 0.038 shows infinite chains of DABCO cations and an undulated layer of anions and water molecules. The octahydrate of the 3:2 compound (P21/c, Rgt = 0.042 features DABCO triples and clusters of four tetrazolate ions in a network of water molecules.

  11. Structure of rat acidic fibroblast growth factor at 1.4 A resolution

    DEFF Research Database (Denmark)

    Kulahin, Nikolaj; Kiselyov, Vladislav; Kochoyan, Artur

    2007-01-01

    Fibroblast growth factors (FGFs) constitute a family of 22 structurally related heparin-binding polypeptides that are involved in the regulation of cell growth, survival, differentiation and migration. Here, a 1.4 A resolution X-ray structure of rat FGF1 is presented. Two molecules are present...... in the asymmetric unit of the crystal and they coordinate a total of five sulfate ions. The structures of human, bovine and newt FGF1 have been published previously. Human and rat FGF1 are found to have very similar structures....

  12. Indomethacin solubility estimation in 1,4-dioxane + water mixtures by the extended hildebrand solubility approach

    Directory of Open Access Journals (Sweden)

    Miller A Ruidiaz

    2011-09-01

    Full Text Available Extended Hildebrand Solubility Approach (EHSA was successfully applied to evaluate the solubility of Indomethacin in 1,4-dioxane + water mixtures at 298.15 K. An acceptable correlation-performance of EHSA was found by using a regular polynomial model in order four of the W interaction parameter vs. solubility parameter of the mixtures (overall deviation was 8.9%. Although the mean deviation obtained was similar to that obtained directly by means of an empiric regression of the experimental solubility vs. mixtures solubility parameters, the advantages of EHSA are evident because it requires physicochemical properties easily available for drugs.

  13. Investigation on photochromism of 1,2-bis(1,4-dimethyl-2-phenyl)perfluorocyclopentene

    Institute of Scientific and Technical Information of China (English)

    LIU Xuedong; TONG Qingxiao; SHI Ming; ZHANG Fushi

    2006-01-01

    The photochromic diarylethene, 1,2-bis(1,4-dimethyl-2-phenyl)perfluorocyclopentene has been synthesized and its single crystal can be obtained in hexane at -4℃. The structure of diphenylperluorocyclopentene bearing C2/c space group and monoclinic crystal system is very different from that of dithienylperfluorocyclopentene derivatives bearing Pī space group and triclinic crystal system by X-ray crystallographic analysis. The compound undergoes the phototchromic reaction in solution but no optical activity in single crystal. In addition, its optimum conformation in solvent is also discussed.

  14. Bandwidth and Offset Launch Investigations on a 1.4 m Multimode Polymer Spiral Waveguide

    CERN Document Server

    Chen, Jian; Penty, Richard V; White, Ian H; Westbergh, Petter; Larsson, Anders

    2016-01-01

    Bandwidth measurements are conducted on a 1.4 m long spiral polymer multimode waveguide for a SMF and 50/125 um MMF launch and for different input offsets. The waveguide exhibits a bandwidth of at least 30 GHz for all input types, yielding a bandwidth-length product of at least 42 GHzxm, while no impact is observed on the waveguide performance due to the different spatial input offsets. The results indicate that data transmission at data rates even higher than 25 Gb/s can be achieved over such structures, thereby demonstrating the potential of multimode polymer waveguide technologies in short-reach board-level datacommunication links.

  15. Synthesis, antimicrobial and antifungal activities of novel 1H-1,4-diazepines containing pyrazolopyrimidinone moiety

    Indian Academy of Sciences (India)

    Rajesh Kumar; Yogesh Chandra Joshi

    2009-07-01

    Acylation of 5-(2-ethoxyphenyl)-1-methyl-3-propyl-1,6-dihydro-7-pyrazolo [4,3-d) pyrimidin-7-one 1 with chloroacetylchloride in the presence of anyhydrous aluminium chloride affords 5-[(5-chloroacetyl-2-ethoxy)phenyl]-1-methyl-3-propyl-1,6-dihydro-7H-pyrazolo [4,3-d] pyrimidin-7-one 2. The compound 2 condensed with various -diketones/-ketoesters compound, to obtain new -diketones/-ketoesters 4a-i treated with ethylenediamine (EDA) gives 1H-1,4-diazepines. The compounds 5a-i has been screened for antimicrobial, antifungal and anthelmintic activities.

  16. Primary staging of prostate cancer

    Energy Technology Data Exchange (ETDEWEB)

    Jager, G.J. [Dept. of Radiology, Univ. Hospital, Nijmegen (Netherlands); Barentz, J.O. [Dept. of Radiology, Univ. Hospital, Nijmegen (Netherlands); Ruijter, E.T.G. [Dept. of Urology, Univ. Hospital, Nijmegen (Netherlands)]|[Dept. of Pathology, Univ. Hospital, Nijmegen (Netherlands); Rosette, J.J.M.C.H. de la [Dept. of Urology, Univ. Hospital, Nijmegen (Netherlands); Oosterhof, G.O.N. [Dept. of Urology, Univ. Hospital, Nijmegen (Netherlands)

    1996-04-01

    Staging prostate cancer is a systematic classification of the extent of disease based on clinical and pathological criteria. Despite general acceptance of the TNM staging system, a lot of controversy and uncertainty with respect to staging still exists. This paper gives an overview of differnt staging modalities and emphasizes the need for incorporation of prognostic factors, such as tumour grade and volume, in the staging system. (orig.)

  17. Synthesis and Biological Evaluation of Lipophilic 1,4-Naphthoquinone Derivatives against Human Cancer Cell Lines

    Directory of Open Access Journals (Sweden)

    Shao-Hung Wang

    2015-06-01

    Full Text Available To examine the effect of hydrophobicity on the anticancer activity of 1,4-naphthoquinone derivatives, a series of compounds bearing a 2-O-alkyl-, 3-C-alkyl- or 2/3-N-morpholinoalkyl group were synthesized and evaluated for their anticancer activity against five human cancer cell lines in vitro. The cytotoxicity of these derivatives was assayed against HT-29, SW480, HepG2, MCF-7 and HL-60 cells by the MTT assay. Among them, 2-hydroxy-3-farnesyl-1,4-naphthoquinone (11a was found to be the most cytotoxic against these cell lines. Our results showed that the effectiveness of compound 11a may be attributed to its suppression of the survival of HT-29. Secondly, in the Hoechst 33258 staining test, compound 11a-treated cells exhibited nuclear condensation typical of apoptosis. Additionally, cell cycle analysis by flow cytometry indicated that compound 11a arrested HT-29 cells in the S phase. Furthermore, cell death detected by Annexin V-FITC/propidium iodide staining showed that compound 11a efficiently induced apoptosis of HT-29 in a concentration-dependent manner. Taken together, compound 11a effectively inhibits colon cancer cell proliferation and may be a potent anticancer agent.

  18. Inactivation of urease by 1,4-benzoquinone: chemistry at the protein surface.

    Science.gov (United States)

    Mazzei, L; Cianci, M; Musiani, F; Ciurli, S

    2016-04-07

    The high activity of urease, a Ni(ii) enzyme, has several adverse effects on human health and agriculture, and its modulation needs the use of inhibitors. 1,4-Benzoquinone (BQ) irreversibly inactivates Sporosarcina pasteurii urease (SPU), with first order kinetics for both the inhibitor and the enzyme. This reaction is stoichiometrically quenched in the presence of sulphite. The 2.07 Å crystal structure of SPU bound to BQ shows the presence of a 1,4-hydroquinone moiety covalently bound to the thiol group of αCys322, a key residue found on the mobile flap regulating the substrate access to the active site. The 1.75 Å crystal structure obtained when sulphite is added to a solution of SPU previously incubated with BQ shows the presence of a 2,5-dihydroxy-benzenesulphonate moiety bound to the αCys322 thiol group. These data reveal how the active site cysteine reacts with a prototypical BQ moiety, found in a large number of natural substances potentially suitable to control the urease activity.

  19. MODELING CST ION EXCHANGE FOR CESIUM REMOVAL FROM SCIX BATCHES 1 - 4

    Energy Technology Data Exchange (ETDEWEB)

    Smith, F.

    2011-04-25

    The objective of this work is, through modeling, to predict the performance of Crystalline Silicotitinate (CST) for the removal of cesium from Small Column Ion Exchange (SCIX) Batches 1-4 (as proposed in Revision 16 of the Liquid Waste System Plan). The scope of this task is specified in Technical Task Request (TTR) 'SCIX Feed Modeling', HLE-TTR-2011-003, which specified using the Zheng, Anthony, Miller (ZAM) code to predict CST isotherms for six given SCIX feed compositions and the VErsatile Reaction and SEparation simulator for Liquid Chromatography (VERSE-LC) code to predict ion-exchange column behavior. The six SCIX feed compositions provided in the TTR represent SCIX Batches 1-4 and Batches 1 and 2 without caustic addition. The study also investigated the sensitivity in column performance to: (1) Flow rates of 5, 10, and 20 gpm with 10 gpm as the nominal flow; and (2) Temperatures of 25, 35, and 45 C with 35 C as the nominal temperature. The isotherms and column predictions presented in this report reflect the expected performance of engineered CST IE-911. This form of CST was used in experiments conducted at the Savannah River National Laboratory (SRNL) that formed the basis for estimating model parameters (Hamm et al., 2002). As has been done previously, the engineered resin capacity is estimated to be 68% of the capacity of particulate CST without binder.

  20. Inositol 1,4,5-trisphosphate receptor 1 is essential to spinocerebellar ataxia modeling

    Directory of Open Access Journals (Sweden)

    Sherry-Ann eBrown

    2015-01-01

    Full Text Available A suite of models was developed to study the role of inositol 1,4,5-trisphosphate receptor 1 (IP3R1 in spinocerebellar ataxias (SCAs. Several SCAs are linked to reduced abundance of IP3R1 or to supranormal sensitivity of the receptor to activation by its ligand inositol 1,4,5-trisphosphate (IP3. Detailed multidimensional models have been created to simulate biochemical calcium signaling and membrane electrophysiology in cerebellar Purkinje neurons. In these models, IP3R1-mediated calcium release is allowed to interact with ion channel response on the cell membrane. Experimental findings in mice and clinical observations in humans provide data input for the models. The SCA modeling suite helps interpret experimental results and provides suggestions to guide experiments. The models predict IP3R1 supersensitivity in SCA1 and compensatory mechanisms in SCA1, SCA2, and SCA3. Simulations explain the impact of calcium buffers. Results show that IP3R1-mediated calcium release activates voltage-gated calcium-activated potassium channels in the plasma membrane. The SCA modeling suite unifies observations from experiments in a number of SCAs. The cadre of simulations demonstrates the central role of IP3R1.

  1. Deep 1.4 GHZ Follow Up of the Steep Spectrum Radio Halo in Abell 521

    CERN Document Server

    Dallacasa, D; Giacintucci, S; Cassano, R; Venturi, T; Macario, G; Kassim, N E; Lane, W; Setti, G

    2009-01-01

    In a recent paper we reported on the discovery of a radio halo with very steep spectrum in the merging galaxy cluster Abell 521 through observations with the Giant Metrewave Radio Telescope (GMRT). We showed that the steep spectrum of the halo is inconsistent with a secondary origin of the relativistic electrons and supports a turbulent acceleration scenario. At that time, due to the steep spectrum, the available observations at 1.4 GHz (archival NRAO - Very Large Array - VLA CnB-configuration data) were not adequate to accurately determine the flux density associated with the radio halo. In this paper we report the detection at 1.4 GHz of the radio halo in Abell 521 using deep VLA observations in the D-configuration. We use these new data to confirm the steep-spectrum of the object. We consider Abell 521 the prototype of a population of very-steep spectrum halos. This population is predicted assuming that turbulence plays an important role in the acceleration of relativistic particles in galaxy clusters, and...

  2. Experiment data report for LOFT nonnuclear Test L1-4. [PWR

    Energy Technology Data Exchange (ETDEWEB)

    Batt, D. L.

    1977-07-01

    Test L1-4 was the fourth in a series of five nonnuclear isothermal blowdown tests conducted by the Loss of Fluid Test (LOFT) Program. Test L1-4 was the first Nuclear Regulatory Commission standard problem (International Problem No. 5 and U.S. Problem No. 7) experiment conducted at LOFT. Data from this test will be compared with predictions generated by the standard problem participants. For this test the LOFT Facility was configured to simulate a loss-of-coolant accident in a large pressurized water reactor resulting from a 200% double-ended offset shear break in a cold leg of the primary coolant system. A hydraulic core simulator assembly was installed in place of the nuclear core. The initial conditions in the primary coolant system intact loop were temperature at 279/sup 0/C, gauge pressure at 15.65 MPa, and intact loop flow at 268.4 kg/s. During system depressurization into a simulated containment, emergency core cooling water was injected into the primary coolant system cold leg to provide data on the effects of emergency core cooling on system thermalhydraulic response.

  3. The Orbital Period of the Accreting Pulsar GX1+4

    CERN Document Server

    Pereira, M G; Jablonski, F J; Pereira, Marildo G.; Braga, Joao; Jablonski, Francisco J.

    1999-01-01

    We report strong evidence for a ~304-day periodicity in the spin history of the accretion-powered pulsar GX1+4 that is most probably associated with the orbital period of the system. We have used data from the Burst and Transient Source Experiment on the Compton Gamma Ray Observatory to show a clear periodic modulation of the pulsar frequency from 1991 to date, in excellent agreement with the ephemeris proposed by Cutler, Dennis & Dolan (1986). Our results indicate that the orbital period of GX1+4 is 303.8 +- 1.1 days, making it the widest known low-mass X-ray binary system by more than one order of magnitude and putting this long-standing question to rest. A likely scenario for this system is an elliptical orbit in which the neutron star decreases its spin-down rate (or even exhibits a momentary spin-up behavior) at periastron passages due to the higher torque exerted by the accretion disk onto the magnetosphere of the neutron star. These results are not inconsistent with both the X-ray pulsed flux light...

  4. Deformed Matrix Models, Supersymmetric Lattice Twists and N=1/4 Supersymmetry

    Energy Technology Data Exchange (ETDEWEB)

    Unsal, Mithat

    2008-09-24

    A manifestly supersymmetric nonperturbative matrix regularization for a twisted version of N = (8, 8) theory on a curved background (a two-sphere) is constructed. Both continuum and the matrix regularization respect four exact scalar supersymmetries under a twisted version of the supersymmetry algebra. We then discuss a succinct Q = 1 deformed matrix model regularization of N = 4 SYM in d = 4, which is equivalent to a non-commutative A*{sub 4} orbifold lattice formulation. Motivated by recent progress in supersymmetric lattices, we also propose a N = 1/4 supersymmetry preserving deformation of N = 4 SYM theory on R{sup 4}. In this class of N = 1/4 theories, both the regularized and continuum theory respect the same set of (scalar) supersymmetry. By using the equivalence of the deformed matrix models with the lattice formulations, we give a very simple physical argument on why the exact lattice supersymmetry must be a subset of scalar subalgebra. This argument disagrees with the recent claims of the link approach, for which we give a new interpretation.

  5. 1,4-alpha-Glucan phosphorylase form Klebsiella pneumoniae covalently couple on porous glass.

    Science.gov (United States)

    Wengenmayer, F; Linder, D; Wallenfels, K

    1977-09-01

    A simplified procedure for the preparation of 1,4-alpha-glucan phosphorylase from Klebsiella pneumoniae is described. An 80-fold purification is achieved in two steps with an overall yield of about 50%. The specific activity of the homogeneous enzyme protein is 17.7 units/mg. Compared with glycogen phosphorylase from rabbit muscle the enzyme from K. pneumoniae shows a markedly higher stability against deforming and chaotropic agents. The 1,4-alpha-glucan phosphorylase was covalently bound to porous glass particles by three different methods. Coupling with glutaraldehyde gave the highest specific activity, i.e., 5.6 units/mg of bound protein or 133 units/g of glass with maltodextrin as substrate. This corresponds to about 30% of the specific activity of the soluble enzyme. With substrates of higher molecular weight, such as glycogen or amylopectin, lower relative activity was observed. The immobilized enzyme preparations showed pH activity profiles which were slightly displaced to higher values and exhibited an increased temperature stability.

  6. Enhancement of the thermostability of β-1,3-1,4-glucanase by directed evolution

    Institute of Scientific and Technical Information of China (English)

    ZHANG Xiu-yan; RUAN Hui; MU Lin; HE Guo-qing; TANG Xing-jun; CHEN Qi-he

    2006-01-01

    In order to improve the thermostability of β- 1,3-1,4-glucanase, evolutionary molecular engineering was used to evolve the β-l,3-1,4-glucanase from Bacillus subtilis ZJF-1A5. The process involves random mutation by error-prone PCR and DNA shuffling followed by screening on the filter-based assay. Two mutants, EGsl and EGs2, were found to have four and five amino acid substitutions, respectively. These substitutions resulted in an increase in melting temperature from Tm=62.5℃ for the wild-type enzyme to Tm=65.5℃ for the mutant EGsl and 67.5℃ for the mutant EGs2. However, the two mutated enzymes had opposite approaches to produce reducing sugar from lichenin with either much higher (28%) for the former or much lower (21.6%)for the latter in comparison with their parental enzymes. The results demonstrate that directed evolution is an effective approach to improve the thermostability of a mesophilic enzyme.

  7. Inositol 1,4,5-trisphosphate 3-kinases: functions and regulations

    Institute of Scientific and Technical Information of China (English)

    Hui Jun XIA; Guang YANG

    2005-01-01

    Inositol 1,4,5-trisphosphate 3-kinase (IP3 3-kinase/IP3K) plays an important role in signal transduction in animal cells by phosphorylating inositol 1,4,5-trisphosphate (IP3) to inositol 1,3,4,5-tetrakisphosphate (IP4). Both IP3 and IP4 are critical second messengers which regulate calcium (Ca2+) homeostasis. Mammalian IP3Ks are involved in many biological processes, including brain development, memory, learning and so on. It is widely reported that Ca2+ is a canonical second messenger in higher plants. Therefore, plant IP3K should also play a crucial role in plant development. Recently,we reported the identification of plant IP3K gene (AtIpk2β/AtIP3K) from Arabidopsis thaliana and its characterization.Here, we summarize the molecular cloning, biochemical properties and biological functions of IP3Ks from animal, yeast and plant. This review also discusses potential functions of IP3Ks in signaling crosstalk, inositol phosphate metabolism,gene transcriptional control and so on.

  8. Intrinsically Conductive Polymer Fibers from Thermoplastic trans-1,4-Polyisoprene.

    Science.gov (United States)

    Han, Peng; Zhang, Xiaohong; Qiao, Jinliang

    2016-05-17

    Herein, we report a new strategy to prepare conductive polymer fibers to overcome the insurmountable weakness of current conductive polymer fibers. First, special thermoplastic polymers are processed into polymer fibers using a conventional melt-spinning process, and then the nonconductive polymer fibers are converted into intrinsically conductive polymer fibers. Using this new strategy, intrinsically conductive polymer fibers have been prepared by melt spinning low-cost thermoplastic trans-1,4-polyisoprene and doping with iodine, which can be as fine as 0.01 mm, and the resistivity can be as low as 10(-2) Ω m. Moreover, it has been found that drawing can improve the orientation of trans-1,4-polyisoprene crystals in the fibers and, thus, the conductivity of the conductive polymer fibers. Therefore, conductive fibers with excellent conductivities can be prepared by large drawing ratios before doping. Such conductive polymer fibers with low cost could be used in textile, clothing, packing, and other fields, which would benefit both industry and daily life. The newly developed method also allows one to produce conductive polymers of any shape besides fibers for antistatic or conductive applications.

  9. Spin period evolution of the X-ray pulsar GX 1+4

    CERN Document Server

    González-Galán, A; Kretschmar, P; Larsson, S; Postnov, K; Kochetkova, A; Finger, M H

    2012-01-01

    We report on the long-term evolution of the spin period of the symbiotic X-ray pulsar GX 1+4 and a possible interpretation within a model of quasi-spherical accretion. New period measurements from BeppoSAX, INTEGRAL and Fermi observations have been combined with previously published data from four decades of observations. During the 1970s GX 1+4 was spinning up with the fastest rate among the known X-ray pulsars at the time. In the mid 1980s it underwent a change during a period of low X-ray ux and started to spin down with a rate similar in magnitude to the previous spin up rate. The spin period has changed from ~110 s to ~160 s within the last three decades. Our results demonstrate that the overall spin down trend continues and is stronger than ever. We compare the observations with predictions from a model assuming quasi-spherical accretion from the slow wind of the M giant companion.

  10. Gas-to-dust ratio in massive star-forming galaxies at z~1.4

    CERN Document Server

    Seko, Akifumi; Yabe, Kiyoto; Hatsukade, Bunyo; Aono, Yuya; Iono, Daisuke

    2016-01-01

    We present results of 12CO(J=2-1) observations toward four massive star-forming galaxies at z~1.4 with the Nobeyama 45~m radio telescope. The galaxies are detected with Spitzer/MIPS in 24 um, Herschel/SPIRE in 250 um, and 350 um and they mostly reside in the main sequence. Their gas-phase metallicities derived with N2 method by using the Ha and [NII]6584 emission lines are near the solar value. CO lines are detected toward three galaxies. The molecular gas masses obtained are (9.6-35) x 10^{10} Msun by adopting the Galactic CO-to-H2 conversion factor and the CO(2-1)/CO(1-0) flux ratio of 3. The dust masses derived with the modified blackbody model (assuming the dust temperature of 35 K and the emissivity index of 1.5) are (2.4-5.4) x 10^{8} Msun. The resulting gas-to-dust ratios (not accounting for HI mass) at z~1.4 are 220-1450, which are several times larger than those in local star-forming galaxies. A dependence of the gas-to-dust ratio on the far-infrared luminosity density is not clearly seen.

  11. A major electronics upgrade for the H.E.S.S. Cherenkov telescopes 1-4

    CERN Document Server

    Giavitto, G; Balzer, A.; Berge, D.; Brun, F.; Chaminade, T.; Delagnes, E.; Fontaine, G.; Füßling, M.; Giebels, B.; Glicenstein, J.F.; Gräber, T.; Hinton, J.A.; Jahnke, A.; Klepser, S.; Kossatz, M.; Kretzschmann, A.; Lefranc, V.; Leich, H.; Lüdecke, H.; Manigot, P.; Marandon, V.; Moulin, E.; de, M.; Nayman, P.; Penno, M.; Ross, D.; Salek, D.; Schade, M.; Schwab, T.; Simoni, R.; Stegmann, C.; Thornhill, J.; Toussenel, F.

    2015-01-01

    The High Energy Stereoscopic System (H.E.S.S.) is an array of imaging atmospheric Cherenkov telescopes (IACTs) located in the Khomas Highland in Namibia. It consists of four 12-m telescopes (CT1-4), which started operations in 2003, and a 28-m diameter one (CT5), which was brought online in 2012. It is the only IACT system featuring telescopes of different sizes, which provides sensitivity for gamma rays across a very wide energy range, from ~30 GeV up to ~100 TeV. Since the camera electronics of CT1-4 are much older than the one of CT5, an upgrade is being carried out; first deployment was in 2015, full operation is planned for 2016. The goals of this upgrade are threefold: reducing the dead time of the cameras, improving the overall performance of the array and reducing the system failure rate related to aging. Upon completion, the upgrade will assure the continuous operation of H.E.S.S. at its full sensitivity until and possibly beyond the advent of CTA. In the design of the new components, several CTA con...

  12. Novel microbial screen for detection of 1,4-butanediol, ethylene glycol, and adipic acid.

    Science.gov (United States)

    Stieglitz, B; Weimer, P J

    1985-03-01

    A novel microbial-screening procedure was developed for separate detection of 1,4-butanediol, ethylene glycol, and adipic acid, three commercially important oxychemicals potentially derivable from bacterial omega-oxidation of n-butanol, ethanol, and hexanoic acid, respectively. The screening method involved postproduction addition of one of several specific Pseudomonas strains which produce a soluble fluorescent pigment during growth on the product of interest. A mutation and selection procedure was developed for isolation of specific strains with phenotypes for growth and pigment production on the desired product (e.g., 1,4-butanediol), but not on its bioconversion substrate (e.g., n-butanol), common by-products (e.g., n-butyrate), or product isomers. Pigment production was growth associated and required cultivation of the screening strains under limiting Fe3+ concentrations. The pigments resembled well-characterized, iron-chelating siderophores produced by other fluorescent pseudomonads. The sensitivity of the assay for product accumulation was enhanced by (i) conducting the screening in microtiter dishes to permit examination of individual isolates of putative producers and to control product diffusion, (ii) using a wavelength cutoff filter to reduce background source light, and (iii) using adapted screening strains which grew at lower (0.3 mM) concentrations of test compounds. The potential utility of the method for detecting a variety of oxidative catabolic products is discussed.

  13. ADAMS/WT advanced development - version 1.4 and beyond

    Energy Technology Data Exchange (ETDEWEB)

    Elliott, A.S.; Depauw, T.R. [Mechanical Dynamics, Inc., Mesa, AZ (United States)

    1996-12-31

    ADAMS/WT is an wind-turbine-specific shell for the general-purpose mechanical system simulation package ADAMS5. It was developed under the guidance of the National Renewable Energy Laboratory to give engineers and analysts in the wind turbine community access to the analytical power of ADAMS, without having to become expert in its particular technology. The 1.4 version of ADAMS/WT is the most recent upgrade to the package, incorporating the most up-to-date version of the AeroDyn aerodynamic forcing subroutines from the University of Utah. It is also the first version to be made available on the Windows/NT platform. In version 1.4, ADAMS/WT has been significantly improved throughout and runs much faster. Automatic generation of standardized output has been added. The documentation has been extensively augmented with more detailed descriptions, more figures and more examples. ADAMS/WT remains the most powerful analytical tool available for horizontal-axis wind turbine development. 10 figs.

  14. Radio variability in the Phoenix Deep Survey at 1.4 GHz

    Science.gov (United States)

    Hancock, P. J.; Drury, J. A.; Bell, M. E.; Murphy, T.; Gaensler, B. M.

    2016-09-01

    We use archival data from the Phoenix Deep Survey to investigate the variable radio source population above 1 mJy beam-1 at 1.4 GHz. Given the similarity of this survey to other such surveys we take the opportunity to investigate the conflicting results which have appeared in the literature. Two previous surveys for variability conducted with the Very Large Array (VLA) achieved a sensitivity of 1 mJy beam-1. However, one survey found an areal density of radio variables on time-scales of decades that is a factor of ˜4 times greater than a second survey which was conducted on time-scales of less than a few years. In the Phoenix deep field we measure the density of variable radio sources to be ρ = 0.98 deg-2 on time-scales of 6 months to 8 yr. We make use of Wide-field Infrared Survey Explorer infrared cross-ids, and identify all variable sources as an active galactic nucleus of some description. We suggest that the discrepancy between previous VLA results is due to the different time-scales probed by each of the surveys, and that radio variability at 1.4 GHz is greatest on time-scales of 2-5 yr.

  15. The Phoenix Deep Survey The 1.4 GHz microJansky catalogue

    CERN Document Server

    Hopkins, A M; Chan, B; Cram, L E; Georgakakis, A; Mobasher, B

    2003-01-01

    The initial Phoenix Deep Survey (PDS) observations with the Australia Telescope Compact Array have been supplemented by additional 1.4 GHz observations over the past few years. Here we present details of the construction of a new mosaic image covering an area of 4.56 square degrees, an investigation of the reliability of the source measurements, and the 1.4 GHz source counts for the compiled radio catalogue. The mosaic achieves a 1-sigma rms noise of 12 microJy at its most sensitive, and a homogeneous radio-selected catalogue of over 2000 sources reaching flux densities as faint as 60 microJy has been compiled. The source parameter measurements are found to be consistent with the expected uncertainties from the image noise levels and the Gaussian source fitting procedure. A radio-selected sample avoids the complications of obscuration associated with optically-selected samples, and by utilising complementary PDS observations including multicolour optical, near-infrared and spectroscopic data, this radio catal...

  16. New series of chelated organochromium(III) complexes. [1,4,8,12-Tetraazacyclopentaedecane

    Energy Technology Data Exchange (ETDEWEB)

    Samuels, G.J.

    1979-01-01

    A kinetic and mechanistic study of the preparation of a new family of chelated organochromium(III) complexes was completed. These species were formed from organic halides and (1,4,8,12 tetraazacyclopentadecane) chromium(II) by a mechanism which involves initial halogen atom abstraction followed by subsequent radical capture by another Cr(II) complex. The rates of reaction follow the pattern expected for a S/sub H/2 process, 3/sup 0/ > 2/sup 0/ > 1/sup 0/ and I > Br > Cl. These organochromium(III) chelate complexes have the trans configuration. Electrophilic cleavage reactions by mercuric and methylmercuric ions were studied. These reactions proceed by a S/sub E/2 (open) mechanism with the reaction rates being approx. 100 times slower for the chelated species. The activation parameters were determined for five reactions. The crystal structure of (trans-chloroaquo(1,4,8,12-tetraazacyclopentadecane)chromium(III))diiodide-dihydrate is also reported. The macrocycle assumes the lowest energy conformation as predicted by strain energy calculations.

  17. Synthesis, Characterization and Thermal Decomposition Studies of Cr(III, Mn(II and Fe(III Complexes of N, N '-Bis[1,3-benzodioxol-5-ylmethylene]butane-1,4-diamine

    Directory of Open Access Journals (Sweden)

    Prasad M. Alex

    2009-01-01

    Full Text Available A bidentate Schiff base ligand namely, N,N'-bis-1,3-benzodioxol-5-ylmethylene]butane-1,4-diamine was synthesised by condensing piperonal (3,4-dioxymethylenebenzaldehyde with butane-1,4-diamine. Cr(III, Mn(II, Fe(III complexes of this chelating ligand were synthesised using acetates, chlorides, bromides, nitrates and perchlorates of these metals. The ligand and the complexes were characterised by elemental analysis, 1H NMR, UV-Vis and IR spectra, conductance and magnetic susceptibility measurements and thermogravimetric analysis. The thermograms of three complexes were analysed and the kinetic parameters for the different stages of decompositions were determined.

  18. Thermally induced crystallization kinetics of uncrosslinked and unfilled synthetic cis-1,4-polyisoprene rubber monitored by shear rheological tests

    Science.gov (United States)

    Yang, Wei; Hong, Daesun; Kim, Hyungsu; Kim, Byungsoo; Chang, Wenji V.

    2016-11-01

    This study demonstrates the unique capability of a shear rotational rheometer for studying the thermally induced crystallization (TIC) of uncrosslinked and unfilled cis-1,4-polyisoprene rubber (IR). At temperatures below -15°C, a crystallization phenomenon (TIC) occurred in a quasi-unstrained IR specimen. Such a distinguished phenomenon was determined from the steady and sharp changes of both tanδ and the modulus. The changing ratio of those parameters with time characterizes the crystallization rate, on which the effects of the compressive force magnitude, testing repeat, and temperature are studied. The crystallization rate was shown to depend less on the magnitude of normal force, but depended largely on the specimen's previous testing history. A specimen not fully recovered from the previous crystallized memory showed a faster rate than before. More cooling to -25°C increased the crystallization rate, but the slow crystallization helped increase the final crystallinity. The crystallization rate was further interpreted by the Avrami equation to propose the crystal structure, whose morphological feature was shown in agreement with the reported TEM and X-ray results. However, our study found a thermo-mechanically aged specimen showed a very different rheological behavior at the late stage of crystallization suggesting the crystalline metamorphosis. But this unexpected behavior turned out to be unrecoverable indicating a property failure due to material aging more plausibly. All these findings were successfully monitored by the rheometer. It is expected the well-organized rheometric measurements can sufficiently supplement some instrumental limitations of the traditional crystallization monitoring analyzers on soft materials.

  19. Effects of Propafenone, Amiodarone and Dilthiazem on the potassium channel of c-Type Kv1.4△N%普罗帕酮、胺碘酮、地尔硫卓对Kv1.4△N钾通道的作用

    Institute of Scientific and Technical Information of China (English)

    王智泉; 蒋学俊; 王世敏; 徐林; 王能; 张冬

    2011-01-01

    目的 探讨不同类别抗心律失常药物普罗帕酮、胺碘酮和地尔硫卓对去N端Kv1.4通道(Kv1.4△N)的作用方式,以及这些作用的差异性.方法 将Kv1.4△N的mRNA注射入非洲爪蟾卵母细胞并使用双电极钳制法(two electrodes voltage clamp,TEV),运用Clampfit 9.0软件分别观察三种药物对KV1..4△N电生理特性的影响.结果 三种药物对ELvl.4△N通道的作用都具有浓度、频率和电压依赖性.在亲和力方面,propafenone的IC50最小,dilthiazem次之,amiodarone的IC50最大(P=0.031);在频率抑制性方面,propafenone组达到稳态时为对照组的41%,amiodarone为32%左右,dilthiazem为21%左右(P=0.045);在电压抑制性方面,100μMpropafenone,500μM amiodarone、350μM dilthjazem在+50 mV电压下分别能使fKv1.4△N通道电流抑制到对照组的(54.6±1.9)%,(46.3±3.5)%和(52.8±2.8)%(P=0.046).结论 三者都是fKv1.4△N通道的开放通道阻滞剂,对fKv1.4△N通道的作用和机制既有相同之处,又有不同特点,这可能是三者抗心律失常的机制之一.%Objective To study the effects of the antiarrhythmic drugs of propafenone, amiodarone and dilthiazem on c-type Kv1. 4 channels in Xenopus laevis oocytes with two-electrode voltage-clamp technique. Methods Defolliculated oocytes ( stage Ⅴ - Ⅵ) had transcribed cRNAs of ferret Kv1. 4△N channels injected. The oocytes were continuously perfused with control solution or propafenone, amiodarone and dilthiazem under monitoring of software of Clampfit v 9. 0. Results All of the three drugs blocked ferret Kv1. 4△N channel in voltage-, frequency- and concentration-dependent manners. The values of IC50 (50%inhibiting concentration ) of propafenone, amiodarone and dilthiazem were ( 103.4± 2. 2 ) μ mol/L,(501.22 +5.9) μmol/L and (353.62 +9.9) μmol/L, respectively. The currents under the actions of propafenone , amiodarone and dilthiazem were decreased to 41%, 32% and 21% of control group, respectively. Propafenone

  20. Preparation of 14-C-labelled 1,4-Dideoxy-1,4-imino-D-arabinitol: Cyanosilylation of Cyclic Imines using KCN in a One-Pot Synthesis

    DEFF Research Database (Denmark)

    Lundt, Inge; Malle, Birgitte Mølholm; Foged, Christian;

    1999-01-01

    A new method for C-C bond formation was developed based on in situ cyanosilylation of cyclic Schiff bases using KCN, TMSCl, KI and ZnI2. This method was used to prepare the potent -glucosidase inhibitor 1,4-dideoxy-1,4-imino-D-arabinitol 14-C labelled at C-5.Keywords: in situ cyanosilylation; 14-C...

  1. Visualization of Ins(1,4,5)P3 dynamics in living cells: two distinct pathways for Ins(1,4,5)P3 generation following mechanical stimulation of HSY-EA1 cells.

    Science.gov (United States)

    Nezu, Akihiro; Tanimura, Akihiko; Morita, Takao; Tojyo, Yosuke

    2010-07-01

    In the present study, the contribution of inositol (1,4,5)-trisphosphate [Ins(1,4,5)P(3)] generation on the mechanical-stimulation-induced Ca(2+) response was investigated in HSY-EA1 cells. Mechanical stimulation induced a local increase in the cytosolic concentration of Ins(1,4,5)P(3) ([IP(3)](i)), as indicated by the Ins(1,4,5)P(3) biosensor LIBRAvIII. The area of this increase expanded like an intracellular Ins(1,4,5)P(3) wave as [IP(3)](i) increased in the stimulated region. A small transient [IP(3)](i) increase was subsequently seen in neighboring cells. The phospholipase C inhibitor U-73122 abolished these Ins(1,4,5)P(3) responses and resultant Ca(2+) releases. The purinergic receptor blocker suramin completely blocked increases in [IP(3)](1) and the Ca(2+) release in neighboring cells, but failed to attenuate the responses in mechanically stimulated cells. These results indicate that generation of Ins(1,4,5)P(3) in response to mechanical stimulation is primarily independent of extracellular ATP. The speed of the mechanical-stimulation-induced [IP(3)](i) increase was much more rapid than that induced by a supramaximal concentration of ATP (1 mM). The contribution of the Ins(1,4,5)P(3)-induced Ca(2+) release was larger than that of Ca(2+) entry in the Ca(2+) response to mechanical stimulation in HSY-EA1 cells.

  2. SYNTHESIS OF THE MACROCYCLIC THIOCROWN ETHERS 1,4,7,10,13,16,19-HEPTATHIAHENEICOSANE (21-S-7) AND 1,4,7,10,13,16,19,22-OCTATHIATETRAEICOSANE (24-S-8)

    NARCIS (Netherlands)

    EDEMA, JJH; KELLOGG, RM

    1994-01-01

    The synthesis and characterization of the two macrocyclic sulfides, 1,4,7,10,13,16,19-heptathiaheneicosane (21-S-7) and 1,4,7,10,13,16,19,22-octathiatetraeicosane (24-S-8), are described starting from different combinations of dithiols and dichlorides of differing chain lengths. Cs2CO3 is used for t

  3. Linking structure to function: Recent lessons from inositol 1,4,5-trisphosphate receptor mutagenesis.

    Science.gov (United States)

    Yule, David I; Betzenhauser, Matthew J; Joseph, Suresh K

    2010-06-01

    Great insight has been gained into the structure and function of the inositol 1,4,5 trisphosphate receptor (InsP(3)R) by studies employing mutagenesis of the cDNA encoding the receptor. Notably, early studies using this approach defined the key constituents required for InsP(3) binding in the N-terminus and the membrane spanning regions in the C-terminal domain responsible for channel formation, targeting and function. In this article we evaluate recent studies which have used a similar approach to investigate key residues underlying the in vivo modulation by select regulatory factors. In addition, we review studies defining the structural requirements in the channel domain which comprise the conduction pathway and are suggested to be involved in the gating of the channel.

  4. Vapor pressure, density, viscosity and refractive index of dimethyl sulfoxide + 1,4-dimethylbenzene system

    Directory of Open Access Journals (Sweden)

    OANA CIOCIRLAN

    2008-01-01

    Full Text Available This paper reports the experimental results of isothermal vapor–liquid equilibrium data between 303.15 and 333.15 K, and densities, viscosities, refractive indices from 298.15 to 323.15 K of the dimethyl sulfoxide + 1,4-dimethylbenzene system over the entire range of mixture composition. The obtained PTX data were correlated by the Wilson and NRTL models and estimated by the UNIFAC model. The excess Gibbs energy and activity coefficients were calculated and compared with others excess properties. Excess molar volumes, viscosity deviations and deviations in refractivity were calculated from the experimental data; all the computed quantities were fitted to the Redlich–Kister equation. The resulting excess functions were interpreted in terms of structure and interactions.

  5. Solid Waste Projection Model: Database User`s Guide. Version 1.4

    Energy Technology Data Exchange (ETDEWEB)

    Blackburn, C.L.

    1993-10-01

    The Solid Waste Projection Model (SWPM) system is an analytical tool developed by Pacific Northwest Laboratory (PNL) for Westinghouse Hanford Company (WHC) specifically to address Hanford solid waste management issues. This document is one of a set of documents supporting the SWPM system and providing instructions in the use and maintenance of SWPM components. This manual contains instructions for using Version 1.4 of the SWPM database: system requirements and preparation, entering and maintaining data, and performing routine database functions. This document supports only those operations which are specific to SWPM database menus and functions and does not Provide instruction in the use of Paradox, the database management system in which the SWPM database is established.

  6. Synthesis of new 1H-1,2,3-triazole-1,4-naphthoquinones

    Directory of Open Access Journals (Sweden)

    Wagner O. Valença

    2012-06-01

    Full Text Available In this work, were synthesized new 1H-1,2,3-triazole-1,4-naphthoquinones via 1,3-dipolar cycloaddition reaction using CuI/acetonitrile without addition of base or ligand. The compounds (3a-i were obtained in moderate-to-good yields 45-92%. To prepare (3d, we obtain a mixture of (3d and (4 in a ratio 3:1, that it was difficult to separate. The low yield for the compound (3f can be also justified based in the formation of aminonaphthoquinone (4. The acetylation of (3h and (3i afforded the compounds (5 and (6 in 77% and 35% of yields, respectively. The low yield of (6 was due to formation of 35 % of the elimination product (7.

  7. 2-[(1R*,4R*-1,4-Dihydroxycyclohexyl]acetic acid

    Directory of Open Access Journals (Sweden)

    Mohammad Arfan

    2011-04-01

    Full Text Available The title compound, C8H14O4, is an isolation product of the aerial parts of Senecio desfontanei. The acetic acid group is oriented at a dihedral angle of 48.03 (9° with respect to the basal plane of the cyclohexane-1,4-diol chair. An intramolecular O—H...O hydrogen bond generates an S(6 ring with an envelope conformation. In the crystal, molecules are linked by O—H...O hydrogen bonds, resulting in R33(20 ring motifs and C(2 O—H...O—H...O—H... chains. Overall, a three-dimensional polymeric network arises. A C—H...O contact is also present.

  8. A tropical rainforest in Colorado 1.4 million years after the Cretaceous-Tertiary boundary.

    Science.gov (United States)

    Johnson, Kirk R; Ellis, Beth

    2002-06-28

    An extremely diverse lower Paleocene (64.1 million years ago) fossil leaf site from Castle Rock, Colorado, contains fossil litter that is similar to the litter of extant equatorial rainforests. The presence of a high-diversity tropical rainforest is unexpected, because other Paleocene floras are species-poor, a feature generally attributed to the Cretaceous-Tertiary (K-T) extinction. The site occurs on the margin of the Denver Basin in synorogenic sedimentary rocks associated with the rise of the Laramide Front Range. Orographic conditions caused by local topography, combined with equable climate, appear to have allowed for the establishment of rainforests within 1.4 million years of the K-T boundary.

  9. A New 1,4-Diazepine from South China Sea Marine Sponge Callyspongia Species

    Directory of Open Access Journals (Sweden)

    Shi-Hai Xu

    2010-02-01

    Full Text Available A new 1,4-diazepine, callysponine (1, was isolated from a South China Sea Callyspongia sp. marine sponge, together with four known proline-based diketopiperazines: cyclo-(S-Pro-R-Leu (2, cyclo-(S-Pro-R-Val (3, cyclo-(S-Pro-R-Ala (4, andcyclo-(S-Pro-R-Tyr (5. The new structure was determined on the basis of NMR and MS analysis, and the absolute stereochemistry was defined by NOESY spectroscopy and optical rotation. The structures of the known compounds were identified by comparison of their spectroscopic data with those reported in the literature. Callysponine (1 did not inhibit the growth of HepG2 (hepatoma carcinoma cell, A549 (lung carcinoma cell, and HeLa (cervical cancer cell cell lines.

  10. 1,4-丁二醇生产技术及市场

    Institute of Scientific and Technical Information of China (English)

    瞿勇

    2010-01-01

    1.概述 1,4-丁二醇(BDO)是一种重要的有机和精细化工原料,被广泛应用于医药、化工、纺织、造纸、汽车和日用化工等领域.由BDO可以生产四氢呋喃(THF)、聚对苯二甲酸丁二醇酯(PBT)、γ-丁内酯(GBL)、聚氨酯(Pu).其它应用还包括、涂料、增塑剂以及作为溶剂和电镀行业的增亮剂等.2010年全球BDO产能为193.4万t/a,中国大陆产能42.9万t/a.

  11. DETERMINATION OF BRANCHING DISTRIBUTION IN HIGH cis-1,4-POLYBUTADIENE BY GPC AND AUTOMATIC VISCOMETRY

    Institute of Scientific and Technical Information of China (English)

    SUN Benhui; JIN Riguang

    1984-01-01

    Based on the methods reported by Ambler and Kraus, a method has been developed for the determination of long-chain branching distribution in polymers by the combined use of GPC and intrinsic viscosity data of polymer fractions. In this method, gi, λi, Gi, mi, the weight percentage of polymer that is branched, etc. can be used simultaneously to characterize the distribution, degree and content of branching in polymers. Some relations between molecular weight polydispersity and branching polydispersity in Nickel-based high cis-1,4-polybutadiene samples are discussed. It was found that the number of long branches λ per unit molecular weight is a function of molecular weight and all of the samples are highly branched at a molecular weight of about 106.

  12. Quinoxaline 1,4-di-N-oxide and the potential for treating tuberculosis.

    Science.gov (United States)

    Vicente, Esther; Villar, Raquel; Pérez-Silanes, Silvia; Aldana, Ignacio; Goldman, Robert C; Mong, Antonio

    2011-04-01

    New drugs active against drug-resistant tuberculosis are urgently needed to extend the range of TB treatment options to cover drug resistant infections. Quinoxaline derivatives show very interesting biological properties (antibacterial, antiviral, anticancer, antifungal, antihelmintic, insecticidal) and evaluation of their medicinal chemistry is still in progress. In this review we report the properties and the recent developments of quinoxaline 1,4-di-N-oxide derivatives as potential anti-tuberculosis agents. Specific agents are reviewed that have excellent antitubercular drug properties, are active on drug resistant strains and non-replicating mycobacteria. The properties of select analogs that have in vivo activity in the low dose aerosol infection model in mice will be reviewed.

  13. Novel quinoxaline 1,4-di-N-oxide derivatives as new potential antichagasic agents.

    Science.gov (United States)

    Torres, Enrique; Moreno-Viguri, Elsa; Galiano, Silvia; Devarapally, Goutham; Crawford, Philip W; Azqueta, Amaia; Arbillaga, Leire; Varela, Javier; Birriel, Estefanía; Di Maio, Rossanna; Cerecetto, Hugo; González, Mercedes; Aldana, Ignacio; Monge, Antonio; Pérez-Silanes, Silvia

    2013-08-01

    As a continuation of our research and with the aim of obtaining new agents against Chagas disease, an extremely neglected disease which threatens 100 million people, eighteen new quinoxaline 1,4-di-N-oxide derivatives have been synthesized following the Beirut reaction. The synthesis of the new derivatives was optimized through the use of a new and more efficient microwave-assisted organic synthetic method. The new derivatives showed excellent in vitro biological activity against Trypanosoma cruzi. Compound 17, which was substituted with fluoro groups at the 6- and 7-positions of the quinoxaline ring, was the most active and selective in the cytotoxicity assay. The electrochemical study showed that the most active compounds, which were substituted by electron-withdrawing groups, possessed a greater ease of reduction of the N-oxide groups.

  14. Crystal structure of chlorido[1-(4-nitrophenylthiourea-κS]bis(triphenylphosphane-κPcopper(I

    Directory of Open Access Journals (Sweden)

    Arunpatcha Nimthong-Roldán

    2017-01-01

    Full Text Available The mononuclear mixed-ligand title complex, [CuCl(C7H7N3O2S(C18H15P2], displays a distorted tetrahedral coordination sphere around the CuI atom, with two P atoms from two triphenylphosphane molecules, one terminal S atom from a 1-(4-nitrophenylthiourea molecule and a chloride ion as ligands. An intramolecular N—H...Cl hydrogen bond stabilizes the molecular conformation [graph-set motif R22(6]. In the crystal, further N—H...Cl hydrogen bonds connect individual molecules into zigzag chains parallel to [001]. The chains are linked by weak C—H...O hydrogen-bonding interactions into a three-dimensional network.

  15. New chalcone and dimeric chalcones with 1,4-p-benzoquinone residue from Combretum yunnanense.

    Science.gov (United States)

    Wu, Ming-Mei; Wang, Li-Qin; Hua, Yan; Chen, Ye-Gao; Wang, Yuan-Yuan; Li, Xing-Yao; Li, Yan; Li, Ting; Yang, Xun-Yun; Tang, Zheng-Rong

    2011-03-01

    New chalcone and dimeric chalcones with 1,4- P-benzoquinone residue, combrequinone A (1), combrequinone B (2), and combrequinone C (3), along with three known compounds (4-6), were isolated from the ethanolic extract of the stems and leaves of Combretum yunnanense, and their structures were determined by spectroscopic analysis. Compounds 1-3 were evaluated for in vitro cytotoxicity against five human cancer cell lines: HL-60, SMMC-7721, A-549, MCF-7, and SW480. Compounds 1, 2 and 3 were found to be most potent against HL-60 acute leukemia cells, with IC₅₀ values of 4.63, 4.07, and 1.26 µM, respectively.

  16. H-1 Dynamic Nuclear Polarization in Supercritical Ethylene at 1.4 T

    Energy Technology Data Exchange (ETDEWEB)

    Wind, Robert A.(BATTELLE (PACIFIC NW LAB)); Shi, Bai (PNNL); Hu, Jian Zhi (BATTELLE (PACIFIC NW LAB)); Solum, Mark S.(Utah, Univ Of); Ellis, Paul D.(BATTELLE (PACIFIC NW LAB)); Grant, David M.(Utah, Univ Of); Pugmire, Ronald J.(Utah, Univ Of); Taylor, Craig M.(DOE); Yonker, Clement R.(BATTELLE (PACIFIC NW LAB))

    2000-03-01

    H1 dynamic nuclear polarization (DNP) has been measured in supercritical ethylene in the pressure range 60-300 bar and in an external field of 1.4 T. A single-cell sapphire tube was used as a high pressure cell and powdered 1,3-bisdiphenylene-2-phenyl allyl(BDPA) free radicals were added and distributed at the wall of the cell. At all pressures the dominant DNP effect was a positive Overhauser enhancement, caused by proton-electron contact interactions at the fluid/solid radical interface. The observed enhancements varied from 12 at 67 bar to 17 at 300 bar. Besides the Overhauser enhancement, also a small solid state and thermal mixing enhancement were observed, indicating that part of the ethylene is absorbed at the radical surface for a prolonged time. These data indicate that DNP-enhanced NMR has the potential of extending the impact of NMR in research areas involving supercritical fluids.

  17. Regulation of the inositol 1,4,5-trisphosphate receptor by tyrosine phosphorylation.

    Science.gov (United States)

    Jayaraman, T; Ondrias, K; Ondriasová, E; Marks, A R

    1996-06-07

    Tyrosine kinases indirectly raise intracellular calcium concentration ([Ca2+]i) by activating phospholipases that generate inositol 1,4,5-trisphosphate (IP3). IP3 activates the IP3 receptor (IP3R), an intracellular calcium release channel on the endoplasmic reticulum. T cell receptor stimulation triggered a physical association between the nonreceptor protein tyrosine kinase Fyn and the IP3R, which induced tyrosine phosphorylation of the IP3R. Fyn activated an IP3-gated calcium channel in vitro, and tyrosine phosphorylation of the IP3R during T cell activation was reduced in thymocytes from fyn-/- mice. Thus, activation of the IP3R by tyrosine phosphorylation may play a role in regulating [Ca2+]i.

  18. Sulphonamide 1,4-dithia-7-azaspiro[4,4]nonane derivatives as gelatinase A inhibitors.

    Science.gov (United States)

    Shi, Leilei; Wang, Qiang; Wang, Haina; Zhou, Hua; Li, Yonggang; Li, Xun

    2013-12-15

    Gelatinase A, a zinc-containing endopeptidase, has been shown to be an essential therapeutic target for tumor intervention owing to its participation in almost all types of solid tumors. Based on our previous work with respect to quinoxalinone peptidomimetics, a novel series of sulphonamide-containing 1,4-dithia-7-azaspiro[4,4]nonane (DAN) derivatives have been synthesized and evaluated as potential gelatinase A inhibitors hereby. The results revealed that the majority of tested compounds displayed satisfactory inhibition activity against gelatinase A. Among the tested compounds, 2b, 3a, 4a-d, 6a, 6d, 7a-d exhibited more potent gelatinase A inhibition than the positive control LY52. Furthermore, two test compounds 2b and 6a demonstrated moderate anti-proliferative in vitro and anti-metastatic activities in vivo, which might be utilized as potential leads in future chemical optimization.

  19. Oxidation characteristics of Ti-33Al-6Nb-1.4Ta

    Science.gov (United States)

    Wallace, T. A.; Clark, R. K.; Sankaran, S. N.; Wiedemann, K. E.

    1991-01-01

    Static oxidation kinetics of the gamma titanium-aluminide alloy Ti-33Al-6Nb-1.4Ta (wt pct) have been investigated in air from 700 to 1000 C and in oxygen from 800 to 1000 C using thermogravimetric analysis. The oxidation kinetics were controlled by the presence of alumina for all oxygen exposures and in air below 800 C, while the kinetics in air above 800 C were more complex. Oxidation products were identified using X-ray diffraction techniques. Oxide scale morphology was examined by SEM and TEM of the surfaces and across sections of oxidized specimens. The oxidation products formed depended on the exposure: Al2O3 and TiO2 were identified on all specimens exposed in and air and oxygen; the nitride phases TiN and Ti2AlN were also found on specimens exposed in air.

  20. Academic Training Lecture Regular Programme: Computer Security - Introduction to information and computer security (1/4)

    CERN Multimedia

    2012-01-01

    Computer Security: Introduction to information and computer security (1/4), by Sebastian Lopienski (CERN).   Monday, 21 May, 2012 from 11:00 to 12:00 (Europe/Zurich) at CERN ( 31-3-004 - IT Auditorium ) Sebastian Lopienski is CERN's Deputy Computer Security Officer. He works on security strategy and policies; offers internal consultancy and audit services; develops and maintains security tools for vulnerability assessment and intrusion detection; provides training and awareness raising; and does incident investigation and response. During his work at CERN since 2001, Sebastian has had various assignments, including designing and developing software to manage and support services hosted in the CERN Computer Centre; providing Central CVS Service for software projects at CERN; and development of applications for accelerator controls in Java. He graduated from the University of Warsaw (MSc in Computer Science) in 2002, and earned an MBA degree at the Enterprise Administration Institute in Ai...

  1. [Pyrido[2,3-b][1,4]diazepinones with CNS activity].

    Science.gov (United States)

    Savelli, F; Boido, A; Pirisino, G; Piu, L; Satta, M; Manca, P

    1987-11-01

    In the interests of developing our research on compounds with a pyrazinone nucleus, cyclohomologues, characterised by the presence of one diazepinone nucleus, were prepared. The 5-[(dialkylamino)alkyl]-3,5-dihydro-2-methyl/phenyl-4H-pyrido[2,3- b][1,4]diazepin-4-ones obtained by means of condensation of the 2-(dialkylamino)alkylamino-3-aminopyridines with ethyl acetyl- or benzoyl- acetate, were subjected to pharmacological experimentation in order to evaluate their effect upon mice with regard to exploratory activity, motor coordination, and spontaneous activity. In addition their analgesic activity was evaluated and also their anti-strychnine, anti-cardiazole, anti-amphetamine and anti-reserpine activities.

  2. VENUS-2 MOX Core Benchmark: Results of ORNL Calculations Using HELIOS-1.4

    Energy Technology Data Exchange (ETDEWEB)

    Ellis, RJ

    2001-02-02

    The Task Force on Reactor-Based Plutonium Disposition, now an Expert Group, was set up through the Organization for Economic Cooperation and Development/Nuclear Energy Agency to facilitate technical assessments of burning weapons-grade plutonium mixed-oxide (MOX) fuel in U.S. pressurized-water reactors and Russian VVER nuclear reactors. More than ten countries participated to advance the work of the Task Force in a major initiative, which was a blind benchmark study to compare code benchmark calculations against experimental data for the VENUS-2 MOX core at SCK-CEN in Mol, Belgium. At the Oak Ridge National Laboratory, the HELIOS-1.4 code was used to perform a comprehensive study of pin-cell and core calculations for the VENUS-2 benchmark.

  3. VENUS-2 MOX Core Benchmark: Results of ORNL Calculations Using HELIOS-1.4 - Revised Report

    Energy Technology Data Exchange (ETDEWEB)

    Ellis, RJ

    2001-06-01

    The Task Force on Reactor-Based Plutonium Disposition (TFRPD) was formed by the Organization for Economic Cooperation and Development/Nuclear Energy Agency (OECD/NEA) to study reactor physics, fuel performance, and fuel cycle issues related to the disposition of weapons-grade (WG) plutonium as mixed-oxide (MOX) reactor fuel. To advance the goals of the TFRPD, 10 countries and 12 institutions participated in a major TFRPD activity: a blind benchmark study to compare code calculations to experimental data for the VENUS-2 MOX core at SCK-CEN in Mol, Belgium. At Oak Ridge National Laboratory, the HELIOS-1.4 code system was used to perform the comprehensive study of pin-cell and MOX core calculations for the VENUS-2 MOX core benchmark study.

  4. Drie nuwe verklaringsopsies in die Jakobusbrief (Jak 2:1; 4:5; 5:6

    Directory of Open Access Journals (Sweden)

    E. A.C. Pretorius

    1988-01-01

    Full Text Available New options in the understanding of the Epistle of James(Js 2:1; 4:5; 5:6 New methods of interpretation occasionally lead to new options in the understanding of texts. In the case of the Epistle of James, the interpretation has until recently stood under the spell of the 'comparative' method of Dibelius. Greater emphasis on internal cohesion in the text recently led to the proposal of the following translations: James 2:1: '... surely, you do not have the faith in our Lord ... on account of favouritism?' James 4:5: 'Do you think Scripture speaks in vain? Should the spirit which He made to dwell in us desire (the world with envy?' James 5:6 'You judge and murder the innocent. Will He (God, cf 4:6 not resist you?'

  5. Genotoxicity of quinoxaline 1,4-dioxide derivatives in Escherichia coli and Salmonella typhimurium.

    Science.gov (United States)

    Nunoshiba, T; Nishioka, H

    1989-05-01

    The mutagenicities of 5 quinoxaline 1,4-dioxide (QdO) derivatives were tested by 2 bacterial assays using forward mutation with Escherichia coli WP2uvrA/pKM101 and reverse mutation with Salmonella typhimurium TA100 and TA98. Potent mutagenic activities of all QdOs tested were observed in both mutation assays. Mutagenicities of these compounds were varied by addition of S9 mix. Their SOS-inducing activities were examined with a 'Rec-lac test' that has been newly developed by us for detecting genotoxins. A high level of SOS-inducing activity was observed in all samples tested. These results suggest that the mutagenicity of QdOs results from the error-prone repair involved in SOS responses.

  6. Magnetic orientation of garden warblers (Sylvia borin) under 1.4 MHz radiofrequency magnetic field.

    Science.gov (United States)

    Kavokin, Kirill; Chernetsov, Nikita; Pakhomov, Alexander; Bojarinova, Julia; Kobylkov, Dmitry; Namozov, Barot

    2014-08-01

    We report on the experiments on orientation of a migratory songbird, the garden warbler (Sylvia borin), during the autumn migration period on the Courish Spit, Eastern Baltics. Birds in experimental cages, deprived of visual information, showed the seasonally appropriate direction of intended flight with respect to the magnetic meridian. Weak radiofrequency (RF) magnetic field (190 nT at 1.4 MHz) disrupted this orientation ability. These results may be considered as an independent replication of earlier experiments, performed by the group of R. and W. Wiltschko with European robins (Erithacus rubecula). Confirmed outstanding sensitivity of the birds' magnetic compass to RF fields in the lower megahertz range demands for a revision of one of the mainstream theories of magnetoreception, the radical-pair model of birds' magnetic compass.

  7. Improvement of Lithium Interface Stability with 1,4-dioxane Pretreatment

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    1,4-dioxane (DOA) was originally used to pretreat the lithium metal electrode in order to improve its interface stability. Electrochemical impedance spectra (EIS) measurements reveal that with DOA pretreatment, lithium electrode has a low and stable interracial resistance during the storage in electrolyte for a long time. And it is also found that the pretreated lithium electrode has an improved inteffacial performance in repeated charge/discharge cycles. Furthermore, it is proved by SEM that the pretreated one has smooth morphology after long-time storage or repeated charge/discharge cycles. Consequentially, because of more stable interface characteristics of lithium electrode, the rechargeable lithium cell with DOA pretreated lithium anode has an obviously enhanced discharging performance and a better cycleability, compared with that of the cell using the untreated lithium anode.

  8. Pulse tube cooler having 1/4 wavelength resonator tube instead of reservoir

    Science.gov (United States)

    Gedeon, David R. (Inventor)

    2008-01-01

    An improved pulse tube cooler having a resonator tube connected in place of a compliance volume or reservoir. The resonator tube has a length substantially equal to an integer multiple of 1/4 wavelength of an acoustic wave in the working gas within the resonator tube at its operating frequency, temperature and pressure. Preferably, the resonator tube is formed integrally with the inertance tube as a single, integral tube with a length approximately 1/2 of that wavelength. Also preferably, the integral tube is spaced outwardly from and coiled around the connection of the regenerator to the pulse tube at a cold region of the cooler and the turns of the coil are thermally bonded together to improve heat conduction through the coil.

  9. Synthesis and Crystal Structure of 2-(N-Cyclohexyl)-imino-1,4-succinic Acid Dihydrate

    Institute of Scientific and Technical Information of China (English)

    郭金波; 李森兰; 郁兆莲; 陈庆华

    2005-01-01

    The title compound, 2-(N-cyclohexyl)-imino-1,4-succinic acid dihydrate 4, has been prepared and structurally determined by X-ray diffraction analysis. Crystal data: monoclinic, space group Cc, a = 7.5790(15), b = 24.860(5), c = 7.1394(14)(A), β = 104.23(3)°, V = 1303.9(4) (A)3, C10H21NO6, Mr = 251.28, Z = 4, Dc = 1.280 g/cm3, μ = 0.105 mm-1, F(000) = 544, R = 0.0397 and wR = 0.0918 for 1212 observed reflections with I ≥ 2σ(I). X-ray structure analysis reveals that there exist two intramolecular and six intermolecular hydrogen-bonding interactions in the crystal lattice, which can stabilize the configuration of the α-imino acid dihydrate 4.

  10. Dielectric properties of poly (1,4-phenylene ether-ether-sulfone)

    CERN Document Server

    Spasevska, H

    2002-01-01

    Dielectric properties of Poly (1,4-phenylene ether-ether-sulfone) are obtained from dielectric spectroscopy of the polymer pellet. The values of relative dielectric constant epsilon', dielectric losses epsilon sup , dielectric dissipation factor tan delta and complex impedance are obtained at temperature of 75 sup o C. The temperature dependence of these parameters is investigated for three frequencies (8x10 sup 4 Hz; 8x10 sup 5 Hz; 8x10 sup 6 Hz) of applied electric field. The specific conductivity sigma, which depends on temperature, is related to the ohmic resistance R, at temperature in the interval from 66 to 83 sup o C. Fitting the experimental data, the value of the activation energy U is obtained. (Original)

  11. SYNTHESIS AND POLYMERIZATION OF 2-OXO-3-METHYLENE-5,6-DIPHENYL-1,4-DIOXAN

    Institute of Scientific and Technical Information of China (English)

    FENG Pinzhen; LU Jiantao

    1994-01-01

    A new cyclic monomer, 2-oxo-3-methylene-5, 6-diphenyl-1,4-dioxan, was synthesized. The structure of the intermediates and the monomer were determined by IR,1H NMR,13C NMR and elemental analysis. This new monomer is different from other cyclic monomers in this series,it is a solid (mp 108-109℃)and not very reactive,but still can undergo free radical ring-opening polymerization. The free radical polymerization was carried out at 130℃. The structure of the resulting polymer was discussed and charaterized by IR, 1H NMR, 13C NMR and elemental analysis. The molecular weight of the polymer was estimated by viscosity determination.

  12. cis-Nitenpyram Analogues Containing 1,4-Dihydropyridine: Synthesis, Insecticidal Activities, and Molecular Docking Studies

    Institute of Scientific and Technical Information of China (English)

    孙传文; 陈艳霞; 刘天雁; 吴颖; 方庭; 王静; 邢家华

    2012-01-01

    A novel series of cb-nitenpyram analogues (2a--2p) were designed and prepared by introducing the 1,4-dihydropyridine, with their eis-configuration confirmed by X-ray diffraction. Preliminary bioassays showed that most compounds exhibited good insecticidal activities at 20 mg/L against Aphis medicagini, and analogues 2a and 2d aflbrded the best activity, and both of them had 100% mortality at 4 mg/L. In addition, molecular docking studies were also performed to model the ligand-receptor complexes, and the results explained the structure-activity relationships observed in vitro, which may provide some useful information for future design of new insecticides.

  13. Purification and characterization of two endo-beta-1,4-glucanases from mollusca, Ampullaria crossean.

    Science.gov (United States)

    Li, Yan-Hong; Guo, Rui; Yin, Qiu-Yu; Ding, Ming; Zhang, Si-Liang; Xu, Gen-Jun; Zhao, Fu-Kun

    2005-10-01

    Two novel endo-beta-1,4-glucanases, EG45 and EG27, were isolated from the gastric juice of mollusca, Ampullaria crossean, by anion exchange, hydrophobic interaction, gel filtration and a second round of anion exchange chromatography. The purified proteins EG45 and EG27 appeared as a single band on sodium dodecylsulfate polyacrylamide gel electrophoresis with a molecular mass of 45 kDa and 27 kDa, respectively. The optimum pH for CMC activity was 5.5 for EG45 and 4.4-4.8 for EG27. The optimum temperature range for EG27 was broad, between 50 degrees and 60 degrees; for EG45 it was 50 degrees. The analysis on the stability of these two endo-beta-1,4-glucanases showed that EG27 was acceptably stable at pH 3.0-11.0 even when the incubation time was prolonged to 24 h at 30 degrees, whereas EG45 remained relatively stable at pH 5.0-8.0. About 85% of the activity of EG27 could be retained upon incubation at 60 degrees for 24 h. However, less than 10% residual activity of EG45 was detected at 50 degrees. Among different kinds of substrates, both enzymes showed a high preference for carboxymethyl cellulose. EG45, in particular, showed a carboxymethyl cellulose hydrolytic activity of 146.5 IU/mg protein. Both enzymes showed low activities to xylan (from oat spelt) and Sigmacell 101, and they were inactive to p-nitrophenyl-beta-D-cellobioside, salicin and starch.

  14. Purification and Characterization of Two Endo-β-1,4-glucanases from Mollusca, Ampullaria crossean

    Institute of Scientific and Technical Information of China (English)

    Yan-Hong LI; Rui GUO; Qiu-Yu YIN; Ming DING; Si-Liang ZHANG; Gen-Jun XU; Fu-Kun ZHAO

    2005-01-01

    Two novel endo-β-1,4-glucanases, EG45 and EG27, were isolated from the gastric juice of mollusca, Ampullaria crossean, by anion exchange, hydrophobic interaction, gel filtration and a second round of anion exchange chromatography. The purified proteins EG45 and EG27 appeared as a single band on sodium dodecylsulfate polyacrylamide gel electrophoresis with a molecular mass of 45 kDa and 27 kDa,respectively. The optimum pH for CMC activity was 5.5 for EG45 and 4.4-4.8 for EG27. The optimum temperature range for EG27 was broad, between 50 ℃ and 60 ℃; for EG45 it was 50 ℃. The analysis on the stability of these two endo-β-1,4-glucanases showed that EG27 was acceptably stable at pH 3.0-11.0 even when the incubation time was prolonged to 24 h at 30 ℃, whereas EG45 remained relatively stable at pH 5.0-8.0. About 85% of the activity of EG27 could be retained upon incubation at 60 ℃ for 24 h. However,less than 10% residual activity of EG45 was detected at 50 ℃. Among different kinds of substrates, both enzymes showed a high preference for carboxymethyl cellulose. EG45, in particular, showed a carboxymethyl cellulose hydrolytic activity of 146.5 IU/mg protein. Both enzymes showed low activities to xylan (from oat spelt) and Sigmacell 101, and they were inactive to p-nitrophenyl-β-D-cellobioside, salicin and starch.

  15. Staging interrail mobilities

    DEFF Research Database (Denmark)

    Jensen, Martin Trandberg; Gyimóthy, Szilvia; Jensen, Ole B.

    2016-01-01

    studies of rail travel, by exploring how interrail travel is embedded in, and (im)mobilised by socio-material environments and institutional design decisions. More precisely, it explores the affordances of three objects that shape interrail mobility: the interrail pass, the RailPlanner application......This article applies the multiscalar ‘staging mobilities’ framework from the emergent subfield of mobilities design to analyse an enduring European rail travel phenomenon, interrail. This discussion extends and contributes to tourism mobilities research. Second, the article enriches previous...... and seat reservations. To reach these aims, the research design intertwines multi-sited ethnography, netnography, survey and interviews. The conclusion offers theoretical reflections pertaining to the role of mobilities designs and methodical hybrids in tourism mobilities research....

  16. Oscillatory dynamics in systems containing bromate and 1,4-cyclohexanedione in acidic media. I. The effect of temperature; Dinamica oscilatoria em sistemas contendo bromato e 1,4-ciclo-hexanodiona em meio acido. I. Efeito da temperatura

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Hyrla C.L.; Oliveira, Tatiane B.; Varela, Hamilton, E-mail: varela@iqsc.usp.br [Instituto de Quimica de Sao Carlos, Universidade de Sao Paulo (IQSC/USP), Sao Carlos, SP (Brazil)

    2012-07-01

    We present in this work the influence of temperature on the dynamics of homogeneous chemical systems containing bromate and 1,4-cyclohexanedione (1,4-CHD) in acidic media. In particular, the following systems were studied: bromate/1,4-CHD/acid, bromate/1,4-CHD/ferroin/acid and bromate/1,4-CHD/trisbipyridine ruthenium/acid. Investigations were carried out by means of an electrochemical probe, at five temperatures between 5 and 45 degree C. Activation energies (Ea) were estimated in different ways for the pre-oscillatory and oscillatory regimes. In any case, the Ea was found to depend on the catalyst, composition and initial concentrations. In addition, it was observed that ferroin and trisbipyridine ruthenium act as catalysts only during the transition between the induction period and oscillatory regime. (author)

  17. CalCOFI Egg Stages

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Egg morphological developmental stage for eggs of selected species captured in CalCOFI icthyoplankton nets. Sequential developmental stages are described by Moser...

  18. Staged urethroplasty: indications and techniques.

    Science.gov (United States)

    Secrest, Charles L

    2002-05-01

    There is still a place for staged urethroplasty. There are some indications for staged urethral reconstruction such as strictures associated with chronic inflammation, fistula, false passage, urethral stones, urethral diverticula, abscess, failed prior repair, complicated hypospadias, severe trauma, neurologic diseases, extensive BXO strictures and long strictures. Staging a urethroplasty should not be considered a step backwards rather instead we should learn from experience and realize there are some patients who are too complex to reconstruct in a single stage.

  19. Siphonoecetini Just, 1983 (Crustacea, Amphipoda, Ischyroceridae) 10

    DEFF Research Database (Denmark)

    Just, Jean

    2012-01-01

    Two new genera and eight new species of bubocorophiid Siphonoecetini are described from north-eastern and northern Australia: Belkginoecetes bullockyensis gen. et sp. nov. B. cooee sp. nov. (type species), B. darwiniense sp. nov., B. fleurae sp. nov., B. solea sp. nov., B. springthorpei sp. nov.,...

  20. Die Gattung Stenothoe (Crustacea, Amphipoda) im Mittelmeer

    NARCIS (Netherlands)

    Krapp-Schickel, Gertraud

    1976-01-01

    Ausgangssituation dieser Untersuchung war die Kenntnis von 11 nominellen Stenothoe-Arten im Mittelmeer. Von diesen wurde St. bosphorana Sowinski, 1898, seit der Beschreibung nicht mehr wiedergefunden, von St. dactylipotens Chevreux, 1908, kannte man nur das ♀, schließlich waren die Arten im Komplex

  1. A facile and regioselective synthesis of 1,4-disubstituted 1,2,3-triazoles using click chemistry

    Science.gov (United States)

    The reaction of α-tosyloxy ketones, sodium azide and terminal alkynes in presence of copper(I) in aqueous polyethylene glycol afforded regioselectively 1,4-disubstituted 1,2,3-triazoles in good yield at ambient temperature. The one-pot exclusive formation of 1,4-disubstituted 1,2...

  2. One-pot synthesis of N-aryl 1,4-dihydropyridine derivatives and their biological activities

    Indian Academy of Sciences (India)

    Isaivani Dhinakaran; Vediappen Padmini; Nattamai Bhuvanesh

    2015-12-01

    Highly efficient, one pot synthesis of N-aryl, 1,4-dihydopyridines was carried out by four component reaction. Synthesized 1,4-dihydropyridines were screened for their cytotoxicity against A549 cell line. All the synthesized compounds exhibited better DPPH radical scavenging activity.

  3. Synthesis of Gingerenone C and 5-Hydroxy-1-(4'-hydroxy- 3'-methoxyphenyl)-7-(4"-hydroxyphenyl)-3-heptanone

    Institute of Scientific and Technical Information of China (English)

    2003-01-01

    The two diarylheptanoids (E)-1-(4'-hydroxy-3'-methoxyphenyl)-7-(4"-hydroxyphenyl) hept-4-en-3-one 1 (Gingerenone C) and (±)-5-hydroxy-1-(4'-hydroxy-3'-methoxyphenyl)-7-(4"-hydroxyphenyl)-3-heptanone 2 were synthesized from vanillin 3 and 4-hydroxybenzaldehyde 9.

  4. Regulation of (1,3;1,4)-beta-D-glucan synthesis in developing endosperm of barley lys mutants

    DEFF Research Database (Denmark)

    Christensen, Ulla; Scheller, Henrik Vibe

    2012-01-01

    The mechanism behind altered content of (1,3:1,4)-beta-D-glucan was investigated in developing endosperm of barley lys3 and lys5 mutants. Both types of mutants are primarily affected in starch biosynthesis, and hence effects on (1,3;1,4)-beta-D-glucan are likely to be pleiotropic. The mutant alle...

  5. Dephosphorylation Pathway of D-myo-Inositol 1,4,5-trisphosphate in the Unicellular Green Alga Chlamydomonas eugametos

    NARCIS (Netherlands)

    Klerk, Hans; Himbergen, John A.J. van; Musgrave, Alan; Haastert, Peter J.M. van; Ende, Herman van den

    1994-01-01

    In vitro dephosphorylation of D-myo-inositol 1,4,5-trisphosphate [Ins(l,4,5)P-3] by vegetative cells, gametes and zygotes of the green alga Chlamydomonas eugametos was studied using a soluble cell fraction as enzyme source and labelled Ins(1,4,5)P-3 as substrate. This compound was dephosphorylated y

  6. Gas phase UV and IR absorption spectra of CxF2x+1CHO (x=1-4)

    DEFF Research Database (Denmark)

    Hashikawa, Y; Kawasaki, M; Waterland, RL;

    2004-01-01

    The UV and IR spectra of CxF2x+1 CHO (x = 1-4) were investigated using computational and experimental techniques. CxF2x+1CHO (x = 1-4) have broad UV absorption features centered at 300-310 nm. The maximum absorption cross-section increases significantly and shifts slightly to the red with increas...

  7. 77 FR 68692 - 1,4-Dimethylnaphthalene; Amendment to an Exemption From the Requirement of a Tolerance

    Science.gov (United States)

    2012-11-16

    ... 1,4-DMN to support the expansion of the tolerance exemption. 1,4-DMN was administered by oral gavage... mating performance, fertility, fecundity, litter survival, sperm morphology/vaginal cytology as well as... (150 ppm) for females. The previous tolerance exemption showed an acute oral toxicity LD 50 of 2,730...

  8. Active phase and polarization locking of a 1.4 kW fiber amplifier.

    Science.gov (United States)

    Goodno, Gregory D; McNaught, Stuart J; Rothenberg, Joshua E; McComb, Timothy S; Thielen, Peter A; Wickham, Michael G; Weber, Mark E

    2010-05-15

    A three-stage Yb-fiber amplifier emitted 1.43 kW of single-mode power when seeded with a 25 GHz linewidth master oscillator (MO). The amplified output was polarization stabilized and phase locked using active heterodyne phase control. A low-power sample of the output beam was coherently combined to a second fiber amplifier with 90% visibility. The measured combining efficiency agreed with estimated decoherence effects from fiber nonlinearity, linewidth, and phase-locking accuracy. This is the highest-power fiber laser that has been coherently locked using any method that allows brightness scaling.

  9. Go-Lab Deliverable D1.4 Go-Lab classroom scenarios handbook

    OpenAIRE

    2015-01-01

    This deliverable presents the Go-Lab scenarios handbook. This handbook offers six different scenarios that are meant to help teachers design ILSs. Each scenario represents a specific pedagogical method within the overall Go-Lab inquiry approach. The six Go-Lab inquiry scenarios are labelled as follows:• The basic scenario • The jigsaw approach • Six changing hats • Learning by critiquing • Structured controversy • Find the mistakeIn a later stage, when a suitable modelling tool has been found...

  10. Synthetic, crystallographic, computational, and biological studies of 1,4-difluorobenzo[c]phenanthrene and its metabolites.

    Science.gov (United States)

    Bae, Suyeal; Mah, Heduck; Chaturvedi, Surendrakumar; Jeknic, Tamara Musafia; Baird, William M; Katz, Amy K; Carrell, H L; Glusker, Jenny P; Okazaki, Takao; Laali, Kenneth K; Zajc, Barbara; Lakshman, Mahesh K

    2007-09-28

    1,4-Difluorobenzo[c]phenanthrene (1,4-DFBcPh) and its putative metabolites, the dihydrodiol and diol epoxides, have been synthesized and structurally characterized, and the extent of DNA binding by the metabolites has been assessed. 1,4-DFBcPh and 1,4-difluoro-10-methoxybenzo[c]phenanthrene were prepared by photochemical cyclization of appropriate naphthylphenylethylenes. The dihydrodiol was synthesized from 1,4-difluoro-10-methoxybenzo[c]phenanthrene, and the diol epoxides were diastereoselectively synthesized from the dihydrodiol. Interesting differences were noted in 1H NMR spectra of the series 1 (syn) diol epoxides of benzo[c]phenanthrene (BcPh) and 1,4-DFBcPh; the BcPh diol epoxide displays a quasi-diequatorial orientation of the hydroxyl groups, but in the 1,4-DFBcPh case these are diaxially disposed. This difference probably stems from the presence of the fjord-region fluorine atom in 1,4-DFBcPh. A through-space, fjord-region H-F coupling has also been observed for 1,4-DFBcPh and its derivatives. Comparative X-ray crystallographic analyses of BcPh and 1,4-DFBcPh and their dihydrodiols show that introduction of fluorine increases the molecular distortion by about 6-7 degrees . As a guide to estimating the molecular distortion and its effects, and for comparison with the X-ray structures in known cases, optimized structures of BcPh, 1,4-DFBcPh, and 1,4-DMBcPh (the dimethyl analogue) as well as their dihydrodiols and diol epoxides were computed. Relative aromaticities of these compounds were assessed by nucleus-independent chemical shift calculations, and 13C NMR chemical shifts were computed by gauge-inducing atomic orbital calculations. 1,4-DFBcPh and its dihydrodiol were subjected to metabolism, and the amount of DNA binding in human breast cancer MCF-7 cells was assessed. The extent of DNA binding was then compared with that for BcPh and its dihydrodiol and the potent carcinogen benzo[a]pyrene. The 1,4-DFBcPh series 2 (anti) diol epoxide-derived DNA

  11. Comparative study of equimolar doses of gamma-hydroxybutyrate (GHB), 1,4-butanediol (1,4-BD) and gamma-butyrolactone (GBL) on catalepsy after acute and chronic administration.

    Science.gov (United States)

    Towiwat, Pasarapa; Phattanarudee, Siripan; Maher, Timothy J

    2013-01-01

    Gamma-hydroxybutyrate (GHB), and its precursors 1,4-butanediol (1,4-BD) and gamma-butyrolactone (GBL) are known drugs of abuse. The ability of acute and chronic administration of equimolar doses of GHB (200mg/kg), 1,4-BD (174mg/kg) and GBL (166mg/kg) to produce catalepsy in male Swiss Webster mice was examined. GHB, 1,4-BD, GBL produced catalepsy when injected acutely. Drug treatment was then continued for 14days. Tolerance development was determined on days 6, 14, and challenged with a higher dose on day 15 in those chronically pretreated mice, and compared with naïve mice. Chronic GHB produced tolerance to catalepsy, as evidenced from area under the curve (AUC) of catalepsy versus time (min-sec) on days 6 (678±254), 14 (272±247), which were less than those on day 1 (1923±269). However, less tolerance was seen from GBL or 1,4-BD, as AUCs on days 6 and 14 were not significantly lower than that of day 1. In conclusion, although equimolar doses were used, expecting similar levels of GHB in the body, 1,4-BD and GBL shared only some of the in vivo effects of GHB. The rate of metabolic conversion of 1,4-BD and GBL into GHB might be responsible for the differences in the tolerance development to these drugs.

  12. A double peaked pulse profile observed in GX 1+4.

    Science.gov (United States)

    Paul, B.; Agrawal, P. C.; Rao, A. R.; Manchanda, R. K.

    1997-03-01

    The hard X-ray pulsar GX 1+4 was observed several times in the last few years with a pair of balloon-borne Xenon filled Multi-cell Proportional Counters (XMPC). In a balloon flight made on 22 March 1995, the source was detected in a bright state, the average observed source count rate being 8.0+/-0.2s^-1^ per detector. X-ray pulsations with a period of 121.9+/-0.1 s were detected in the source with a broad double peak pulse feature. When observed in December 1993 with the same instrument, the pulse profile of GX 1+4 showed a single peak. This change in the pulse profile to a double pulse structure in about 15 months indicates either activation of the opposite pole of the neutron star if the magnetic field is asymmetric or possibly a change in the beam pattern, from a pencil beam to a fan beam. Assuming a fan beam configuration, the pulse profile is used to find the inclinations of the magnetic axis and the viewing axis with the spin axis. The derived angles support the GINGA observations of a dip in the pulse profile which was resolved to have a local maximum in one of the observations and was explained with resonance scattering of cyclotron line energy photons by the accretion column (Makishima et al., 1988Natur.333..746M, Dotani et al., 1989PASJ...41..427D). Compared to our previous observation of the same source with the same telescope (Rao et al., 1994A&A...289L..43R) a period change rate of 0.72 +/-0.40s/yr is obtained which is the lowest rate of change of period for this source since its discovery. Average pulse fraction in the hard X-ray range is low (30%), consistent with its anti correlation with luminosity as reported by us earlier (Rao et al., 1994A&A...289L..43R) and the observed spectrum is very hard (power law photon index 1.67+/-0.12).

  13. Science on stage

    CERN Multimedia

    2005-01-01

    During the opening ceremony, the audience was dazzled by a juggling show involving dramatic light effects. They also took away with them a teacher's sheet explaining some of the scientific concepts involved in juggling. Science teachers can sometimes be quite humorous when it comes to explaining serious matters, as those who took part in the 'Science on Stage' festival held at CERN from 21 to 25 November were able to see for themselves. The 500 or so participants from 27 different countries, mostly science teachers but also some university lecturers, science outreach specialists and students, had the opportunity to share their experience of the teaching of science. They also attended presentations and shows, took part in workshops and visited a fair with stands offering ideas on how to make school science lessons more appealing. The festival, organised by the EIROforum (a partnership between CERN, EFDA, ESA, ESO, EMBL, ESRF and ILL), marked the end of two years of projects for the promotion of science in vir...

  14. Bevacizumab, Cisplatin, Radiation Therapy, and Fluorouracil in Treating Patients With Stage IIB, Stage III, Stage IVA, or Stage IVB Nasopharyngeal Cancer

    Science.gov (United States)

    2014-04-21

    Stage II Squamous Cell Carcinoma of the Nasopharynx; Stage III Lymphoepithelioma of the Nasopharynx; Stage III Squamous Cell Carcinoma of the Nasopharynx; Stage IV Lymphoepithelioma of the Nasopharynx; Stage IV Squamous Cell Carcinoma of the Nasopharynx

  15. Activated Persulfate Treatment of 1,4-Dioxane in the Presence of Chlorinated Solvent Co-contaminants

    Science.gov (United States)

    Boving, T. T.; Eberle, D. E. H.; Ball, R.

    2014-12-01

    1,4-dioxane is an emerging groundwater contaminant and a likely human carcinogen. Due to its history as a stabilizer in chlorinated solvents, 1,4-dioxane is often found as a co-contaminant at solvent releases sites such as landfills, solvent recycling facilities, vapor decreasing operations, and fire-training areas. Historically, 1,4-dioxane was not routinely analyzed for at solvent release sites. The lack of analyses and the limitations of the analyses that were performed (i.e. high reporting limits) means that the scale of 1,4-dioxane subsurface contamination is still emerging. With the number of known 1,4-dioxane sites increasing, the need for cost effective 1,4-dioxane remediation technologies is rising as well. Remediation strategies that are capable of treating both 1,4-dioxane as well as chlorinated co-contaminants are of particular importance, especially when treating mixed-waste source zones. In the present study, we examined the fate of 1,4-dioxane during the targeted remediation of aqueous phase volatile organic compounds (VOC) using an activated persulfate based ISCO method (OxyZone®). Bench scale laboratory experiments are used to evaluate the treatability of 1,4-dioxane both as a single compound and in the presence of trichloroethene (TCE) and 1,1,1-trichloroethane (1,1,1-TCA). Possible dependencies on oxidant concentration and reaction kinetics were studied. Preliminary results are promising and show that OxyZone® is persistent and long lived, with oxidation of 1,4-dioxane continuing more than 12 days after initial dosage, even at dilute oxidant concentrations. The oxidative destruction of 1,4-dioxane, TCE and 1,1,1-TCA in single compound batch systems followed pseudo first order reaction kinetics. The rate of oxidation for each contaminant increased linearly with increasing persulfate concentration over the range of oxidant concentrations tested. The rate of oxidative destruction, from most easily degraded to least was: TCE > 1,4-Dioxane > 1

  16. Lineage-related cytotoxicity and clonogenic profile of 1,4-benzoquinone-exposed hematopoietic stem and progenitor cells

    Energy Technology Data Exchange (ETDEWEB)

    Chow, Paik Wah [Biomedical Science Programme, School of Diagnostic & Applied Health Sciences, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Jalan Raja Abdul Muda Aziz, 50300 Kuala Lumpur, Wilayah Persekutuan (Malaysia); Toxicology Laboratory, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur (Malaysia); Abdul Hamid, Zariyantey, E-mail: zyantey@ukm.edu.my [Biomedical Science Programme, School of Diagnostic & Applied Health Sciences, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Jalan Raja Abdul Muda Aziz, 50300 Kuala Lumpur, Wilayah Persekutuan (Malaysia); Toxicology Laboratory, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur (Malaysia); Chan, Kok Meng [Environmental Health and Industrial Safety Programme, School of Diagnostic & Applied Health Sciences, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Jalan Raja Abdul Muda Aziz, 50300 Kuala Lumpur, Wilayah Persekutuan (Malaysia); Toxicology Laboratory, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur (Malaysia); Inayat-Hussain, Salmaan Hussain [Environmental Health and Industrial Safety Programme, School of Diagnostic & Applied Health Sciences, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Jalan Raja Abdul Muda Aziz, 50300 Kuala Lumpur, Wilayah Persekutuan (Malaysia); Rajab, Nor Fadilah [Biomedical Science Programme, School of Diagnostic & Applied Health Sciences, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Jalan Raja Abdul Muda Aziz, 50300 Kuala Lumpur, Wilayah Persekutuan (Malaysia); Toxicology Laboratory, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur (Malaysia)

    2015-04-01

    Hematopoietic stem cells (HSCs) and hematopoietic progenitor cells (HPCs) are sensitive targets for benzene-induced hematotoxicity and leukemogenesis. The impact of benzene exposure on the complex microenvironment of HSCs and HPCs remains elusive. This study aims to investigate the mechanism linking benzene exposure to targeting HSCs and HPCs using phenotypic and clonogenic analyses. Mouse bone marrow (BM) cells were exposed ex vivo to the benzene metabolite, 1,4-benzoquinone (1,4-BQ), for 24 h. Expression of cellular surface antigens for HSC (Sca-1), myeloid (Gr-1, CD11b), and lymphoid (CD45, CD3e) populations were confirmed by flow cytometry. The clonogenicity of cells was studied using the colony-forming unit (CFU) assay for multilineage (CFU-GM and CFU-GEMM) and single-lineage (CFU-E, BFU-E, CFU-G, and CFU-M) progenitors. 1,4-BQ demonstrated concentration-dependent cytotoxicity in mouse BM cells. The percentage of apoptotic cells increased (p < 0.05) following 1,4-BQ exposure. Exposure to 1,4-BQ showed no significant effect on CD3e{sup +} cells but reduced the total counts of Sca-1{sup +}, CD11b{sup +}, Gr-1{sup +}, and CD45{sup +} cells at 7 and 12 μM (p < 0.05). Furthermore, the CFU assay showed reduced (p < 0.05) clonogenicity in 1,4-BQ-treated cells. 1,4-BQ induced CFU-dependent cytotoxicity by significantly inhibiting colony growth for CFU-E, BFU-E, CFU-G, and CFU-M starting at a low concentration of exposure (5 μM); whereas for the CFU-GM and CFU-GEMM, the inhibition of colony growth was remarkable only at 7 and 12 μM of 1,4-BQ, respectively. Taken together, 1,4-BQ caused lineage-related cytotoxicity in mouse HPCs, demonstrating greater toxicity in single-lineage progenitors than in those of multi-lineage. - Highlights: • We examine 1,4-BQ toxicity targeting mouse hematopoietic cell lineages. • 1,4-BQ induces concentration-dependent cytotoxicity in bone marrow (BM) cells. • 1,4-BQ shows lineage-related toxicity on hematopoietic stem and

  17. Retrogradation behavior of corn starch treated with 1,4-α-glucan branching enzyme.

    Science.gov (United States)

    Li, Wenwen; Li, Caiming; Gu, Zhengbiao; Qiu, Yijing; Cheng, Li; Hong, Yan; Li, Zhaofeng

    2016-07-15

    The retrogradation behavior of corn starch treated with 1,4-α-glucan branching enzyme (GBE) was investigated using rheometry, pulsed nuclear magnetic resonance (PNMR), differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR). Dynamic time sweep analysis confirmed that the storage modulus (G') of corn starch stored at 4 °C decreased with increasing GBE treatment time. PNMR analysis demonstrated that the transverse relaxation times (T2) of corn starches treated with GBE were higher than that of control during the storage at 4 °C. DSC results demonstrated that the retrogradation enthalpy (ΔHr) of corn starch was reduced by 22.3% after GBE treatment for 10h. Avrami equation analysis showed that GBE treatment reduced the rate of starch retrogradation. FTIR analysis revealed that GBE treatment led to a decrease in hydrogen bonds within the starch. Overall, these results demonstrate that both short- and long-term retrogradation of corn starch were retarded by GBE treatment.

  18. Computational design of an endo-1,4-[beta]-xylanase ligand binding site

    Energy Technology Data Exchange (ETDEWEB)

    Morin, Andrew; Kaufmann, Kristian W.; Fortenberry, Carie; Harp, Joel M.; Mizoue, Laura S.; Meiler, Jens (Vanderbilt)

    2012-09-05

    The field of computational protein design has experienced important recent success. However, the de novo computational design of high-affinity protein-ligand interfaces is still largely an open challenge. Using the Rosetta program, we attempted the in silico design of a high-affinity protein interface to a small peptide ligand. We chose the thermophilic endo-1,4-{beta}-xylanase from Nonomuraea flexuosa as the protein scaffold on which to perform our designs. Over the course of the study, 12 proteins derived from this scaffold were produced and assayed for binding to the target ligand. Unfortunately, none of the designed proteins displayed evidence of high-affinity binding. Structural characterization of four designed proteins revealed that although the predicted structure of the protein model was highly accurate, this structural accuracy did not translate into accurate prediction of binding affinity. Crystallographic analyses indicate that the lack of binding affinity is possibly due to unaccounted for protein dynamics in the 'thumb' region of our design scaffold intrinsic to the family 11 {beta}-xylanase fold. Further computational analysis revealed two specific, single amino acid substitutions responsible for an observed change in backbone conformation, and decreased dynamic stability of the catalytic cleft. These findings offer new insight into the dynamic and structural determinants of the {beta}-xylanase proteins.

  19. Roles of inositol 1,4,5-trisphosphate receptors in spinocerebellar ataxias.

    Science.gov (United States)

    Tada, Masayoshi; Nishizawa, Masatoyo; Onodera, Osamu

    2016-03-01

    Modulation of the intracellular calcium concentration is a ubiquitous signaling system involved in the control of numerous biological processes in a wide variety of cells. Inositol 1,4,5-trisphosphate (IP3) receptors (IP3Rs), which act as calcium release channels in the ER membrane, play a key role in the regulation of intracellular calcium concentration. IP3R type 1 (IP3R1) is the major neuronal IP3R isoform in the central nervous system and particularly abundant in cerebellar Purkinje cells. Heterozygous deletions or missense mutations in ITPR1, which encodes IP3R1, result in autosomal dominantly inherited spinocerebellar ataxias (SCAs), including SCA types 15 (SCA15) and 29 (SCA29). In addition, homozygous missense mutations in carbonic anhydrase-related protein VIII (CARP), which suppresses the ability of IP3 to bind to IP3R1, cause a recessively inherited ataxia with mild cognitive impairment with/without quadrupedal gait. Moreover, cytosolic calcium overload with excessive IP3R1 activity has been implicated in the pathogenesis of other SCAs, including SCA types 2 (SCA2) and 3 (SCA3). These facts indicate that dysregulation of IP3R-mediated calcium signaling is linked to the pathogenesis of SCAs. Here, we focus on the molecular basis of SCA15 and SCA29, which are caused by mutations in ITPR1. In addition, we discuss other SCAs whose pathogenesis may be linked to aberrant activation of IP3R-mediated Ca(2+) signaling.

  20. Near infrared cavity enhanced absorption spectra of atmospherically relevant ether-1, 4-Dioxane

    Science.gov (United States)

    Chandran, Satheesh; Varma, Ravi

    2016-01-01

    1, 4-Dioxane (DX) is a commonly found ether in industrially polluted atmosphere. The near infrared absorption spectra of this compound has been recorded in the region 5900-8230 cm- 1 with a resolution of 0.08 cm- 1 using a novel Fourier transform incoherent broadband cavity-enhanced absorption spectrometer (FT-IBBCEAS). All recorded spectra were found to contain regions that are only weakly perturbed. The possible combinations of fundamental modes and their overtone bands corresponding to selected regions in the measured spectra are tabulated. Two interesting spectral regions were identified as 5900-6400 cm- 1 and 8100-8230 cm- 1. No significant spectral interference due to presence of water vapor was observed suggesting the suitability of these spectral signatures for spectroscopic in situ detection of DX. The technique employed here is much more sensitive than standard Fourier transform spectrometer measurements on account of long effective path length achieved. Hence significant enhancement of weaker absorption lines above the noise level was observed as demonstrated by comparison with an available measurement from database.

  1. Thermal Degradation Kinetics of N,N'-Di(diethoxythiophosphoryl)-1,4-phenylenediamine

    Institute of Scientific and Technical Information of China (English)

    REN Yuan-lin; CHENG Bo-wen; ZHANG Jin-shu; JIANG Ai-bing; FU Wen-li

    2008-01-01

    The non-isothermal degradation kinetics of N,N'-di(diethoxythiophosphoryl)-1,4-phenylenediamine in N2 was studied by TG-DTG techniques.The kinetic parameters,including the activation energy and pre-exponential factor of the degradation process for the title compound were calculated by means of the Kissinger and Fiynn-Wall-Ozawa(FWO) method and the thermal degradation mechanism of the title compound was also studied with the Satava-Sestak methods.The results indicate that the activation energy and pre-exponential factor are 152.61 kJ/mol and 9.06×1014 s-1 with the Kissinger method and 154.08 kJ/mol with the Flynn-Wall-Ozawa method,respectively.It has been shown that the degradation of the title compound follows a kinetic model of one-dimensional diffusion or parabolic law,the kinetic function is G(a)=a2 and the reaction order is n=2.

  2. A planet in a polar orbit of 1.4 solar-mass star

    Directory of Open Access Journals (Sweden)

    Guenther E.W.

    2015-01-01

    Full Text Available Although more than a thousand transiting extrasolar planets have been discovered, only very few of them orbit stars that are more massive than the Sun. The discovery of such planets is interesting, because they have formed in disks that are more massive but had a shorter life time than those of solar-like stars. Studies of planets more massive than the Sun thus tell us how the properties of the proto-planetary disks effect the formation of planets. Another aspect that makes these planets interesting is that they have kept their original orbital inclinations. By studying them we can thus find out whether the orbital axes planets are initially aligned to the stars rotational axes, or not. Here we report on the discovery of a planet of a 1.4 solar-mass star with a period of 5.6 days in a polar orbit made by CoRoT. This new planet thus is one of the few known close-in planets orbiting a star that is substantially more massive than the Sun.

  3. Ionothermal synthesis, structures, properties of cobalt-1,4-benzenedicarboxylate metal-organic frameworks

    Science.gov (United States)

    Zhang, Zong-Hui; Xu, Ling; Jiao, Huan

    2016-06-01

    Eight kinds of 1-methyl-3-alkylimidazolium halide [RMI]X (R=ethyl (E), propyl (P), butyl (B) and amyl (A); MI = imidazolium; X= Cl-, I-) ionic liquids (ILs) were used as reaction media and obtained a series of 2D [RMI]2[Co3(BDC)3X2] frameworks through the ionothermal reactions of 1,4-benzenedicarboxylic acid (H2BDC) with Co(NO3)2·6H2O. The 2D [RMI]2[Co3(BDC)3X2] frameworks exhibit a same (3,6) topology network with [RMI]+ cations locating in the interlayer space. [RMI]+ cations play a template role in the structure constructions, whose influence combining with the effect of X- anions pass to the TG behaviors. The decomposition temperatures of the [RMI]2[Co3(BDC)3X2] frameworks decrease with the alkyl chains in [RMI]+ cations, and the compounds containing Cl- show higher thermal stabilities than those with I-. However, compounds 1-8 exhibit two similar broad emissions at ca. 380 and 390 nm, assigned to ILCT. The RMI+ templates and the X- anions do not exert their influence on the fluorescence.

  4. System for Automated Geoscientific Analyses (SAGA v. 2.1.4

    Directory of Open Access Journals (Sweden)

    O. Conrad

    2015-02-01

    Full Text Available The System for Automated Geoscientific Analyses (SAGA is an open-source Geographic Information System (GIS, mainly licensed under the GNU General Public License. Since its first release in 2004, SAGA has rapidly developed from a specialized tool for digital terrain analysis to a comprehensive and globally established GIS platform for scientific analysis and modeling. SAGA is coded in C++ in an object oriented design and runs under several operating systems including Windows and Linux. Key functional features of the modular organized software architecture comprise an application programming interface for the development and implementation of new geoscientific methods, an easily approachable graphical user interface with many visualization options, a command line interpreter, and interfaces to scripting and low level programming languages like R and Python. The current version 2.1.4 offers more than 700 tools, which are implemented in dynamically loadable libraries or shared objects and represent the broad scopes of SAGA in numerous fields of geoscientific endeavor and beyond. In this paper, we inform about the system's architecture, functionality, and its current state of development and implementation. Further, we highlight the wide spectrum of scientific applications of SAGA in a review of published studies with special emphasis on the core application areas digital terrain analysis, geomorphology, soil science, climatology and meteorology, as well as remote sensing.

  5. Origins of the 1/4 keV Soft X-Ray Background

    CERN Document Server

    Bellm, E C; Bellm, Eric C.; Vaillancourt, John E.

    2005-01-01

    Snowden and coworkers have presented a model for the 1/4 keV soft X-ray diffuse background in which the observed flux is dominated by a ~ 10^6 K thermal plasma located in a 100-300 pc diameter bubble surrounding the Sun, but has significant contributions from a very patchy Galactic halo. Halo emission provides about 11% of the total observed flux and is responsible for half of the H I anticorrelation. The remainder of the anticorrelation is presumably produced by displacement of disk H I by the varying extent of the local hot bubble (LHB). The ROSAT R1 and R2 bands used for this work had the unique spatial resolution and statistical precision required for separating the halo and local components, but provide little spectral information. Some consistency checks had been made with older observations at lower X-ray energies, but we have made a careful investigation of the extent to which the model is supported by existing sounding rocket data in the Be (73-111 eV) and B bands (115-188 eV) where the sensitivities...

  6. Quinoxaline 1,4-di-N-Oxides: Biological Activities and Mechanisms of Actions.

    Science.gov (United States)

    Cheng, Guyue; Sa, Wei; Cao, Chen; Guo, Liangliang; Hao, Haihong; Liu, Zhenli; Wang, Xu; Yuan, Zonghui

    2016-01-01

    Quinoxaline 1,4-di-N-oxides (QdNOs) have manifold biological properties, including antimicrobial, antitumoral, antitrypanosomal and antiinflammatory/antioxidant activities. These diverse activities endow them broad applications and prospects in human and veterinary medicines. As QdNOs arouse widespread interest, the evaluation of their medicinal chemistry is still in progress. In the meantime, adverse effects have been reported in some of the QdNO derivatives. For example, genotoxicity and bacterial resistance have been found in QdNO antibacterial growth promoters, conferring urgent need for discovery of new QdNO drugs. However, the modes of actions of QdNOs are not fully understood, hindering the development and innovation of these promising compounds. Here, QdNOs are categorized based on the activities and usages, among which the antimicrobial activities are consist of antibacterial, antimycobacterial and anticandida activities, and the antiprotozoal activities include antitrypanosomal, antimalarial, antitrichomonas, and antiamoebic activities. The structure-activity relationship and the mode of actions of each type of activity of QdNOs are summarized, and the toxicity and the underlying mechanisms are also discussed, providing insight for the future research and development of these fascinating compounds.

  7. N,N′-Bis(pyridin-2-ylbenzene-1,4-diamine–quinoxaline (2/1

    Directory of Open Access Journals (Sweden)

    Barbara Wicher

    2011-12-01

    Full Text Available The asymmetric unit of the title compound, 2C16H14N4·C8H6N2, consits of one molecule of N,N′-bis(pyridin-2-ylbenzene-1,4-diamine (PDAB and one half-molecule of quinoxaline (QX that is located around an inversion centre and disordered over two overlapping positions. The PDAB molecule adopts a non-planar conformation with an E configuration at the two partially double exo C...;N bonds of the 2-pyridylamine units. In the crystal, these self-complementary units are N—H...N hydrogen bonded via a cyclic R22(8 motif, creating tapes of PDAB molecules extending along [010]. Inversion-related tapes are arranged into pairs through π–π stacking interactions between the benzene rings [centroid–centroid distance = 3.818 (1 Å] and the two symmetry-independent pyridine groups [centroid–centroid distance = 3.760 (1 Å]. The QX molecules are enclosed in a cavity formed between six PDAB tapes.

  8. Path Loss Channel Model for Inland River Radio Propagation at 1.4 GHz

    Directory of Open Access Journals (Sweden)

    Junyi Yu

    2017-01-01

    Full Text Available In this paper, a propagation path loss model for inland river is proposed by three improvements compared with the Round Earth Loss (REL model for open-sea environment. Specifically, parameters optimization uses Okumura-Hata model in dB scale to replace the equation transformed from the free space loss in REL model; secondly, diffraction loss caused by the obstacles (e.g., large buildings, bridges, or some other facilities near the river bank is also taken into account; mixed-path methodology as another improvement is used for Inland River (IR model because the actual propagation environment between transmitter (TX antenna and receiver (RX antenna contains both land part and water part. The paper presents a set of 1.4 GHz measurements conducted along the Yangtze River in Wuhan. According to the comparison between path loss models and experimental results, IR model shows a good matching degree. After that, Root Mean Square Error (RMSE, Grey Relation Grade and Mean Absolute Percentage Error (GRG-MAPE, Pearson Correlation Coefficient, and Mean Absolute Percentage Error (PCC-MAPE are employed to implement quantitative analysis. The results prove that IR model with consideration of mixed path and deterministic information is more accurate than other classic empirical propagation models for these scenarios.

  9. ATLAS - I. Third Release of 1.4 GHz Mosaics and Component Catalogues

    CERN Document Server

    Franzen, T M O; Hales, C A; Hopkins, A; Norris, R P; Seymour, N; Chow, K E; Herzog, A; Huynh, M T; Lenc, E; Mao, M Y; Middelberg, E

    2015-01-01

    We present the third data release from the Australia Telescope Large Area Survey (ATLAS). These data combine the observations at 1.4 GHz before and after upgrades to the Australia Telescope Compact Array reaching a sensitivity of 14 microJy/beam in 3.6 deg^2 over the Chandra Deep Field South (CDFS) and of 17 microJy/beam in 2.7 deg^2 over the European Large Area ISO Survey South 1 (ELAIS-S1). We used a variety of array configurations to maximise the uv coverage resulting in a resolution of 16 by 7 arcsec in CDFS and of 12 by 8 arcsec in ELAIS-S1. After correcting for peak bias and bandwidth smearing, we find a total of 3034 radio source components above 5 sigma in CDFS, of which 514 (17 per cent) are considered to be extended. The number of components detected above 5 sigma in ELAIS-S1 is 2084, of which 392 (19 per cent) are classified as extended. The catalogues include reliable spectral indices (delta alpha < 0.2) between 1.40 and 1.71 GHz for ~350 of the brightest components.

  10. Induction of inositol 1,4,5 trisphosphate receptor genes by ionizing radiation

    Energy Technology Data Exchange (ETDEWEB)

    Yan, J. [Queensland Inst. of Medical Research, Brisbane, QLD (Australia)]|[Queensland Univ., Brisbane, QLD (Australia). Dept. of Surgery; Khanna, K.K.; Lavin, M.F. [Queensland Inst. of Medical Research, Brisbane, QLD (Australia)

    1996-05-01

    We used differential display, a method designed to amplify partial cDNA sequences from subsets of mRNAs, to identify mRNAs induced by ionizing radiation in human Epstein Barr Virus (EBV)-transformed lymphoblastoid cells. Increased expression of a cDNA corresponding to the inositol 1,4,5 trisphosphate receptor (InsP{sub 3}R) type 1 was observed after exposure of cells to 3Gy {gamma}-rays. This was confirmed by Northern blot analysis. The increase in mRNA for InsP{sub 3}R type 1 was accompanied by a corresponding increase in the level of InsP{sub 3}R type 1 protein as determined by Western blotting. Exposure of cells from patients with the human genetic disorder ataxia-telangiectasia (A-T), characterized by hypersensitivity to ionizing radiation, failed to change the levels of InsP{sub 3}R type 1 mRNA and, as expected, there was no increase in InsP{sub 3}R type 1 protein in A-T cells in response to radiation exposure. Protein levels for two other InsP{sub 3}Rs, types 2 and 3, were observed to increase in control and A-T cells after exposure to ionizing radiation. The induction of the InsP{sub 3}R type 1, which is primarily located in the endoplasmic reticulum, may play an important role in radiation signal transduction. (Author).

  11. Poly[[hexakis(μ-benzene-1,4-dicarboxylatooctakis(N,N-dimethylacetamidehexamanganese(II] monohydrate

    Directory of Open Access Journals (Sweden)

    Ying Zhang

    2011-07-01

    Full Text Available In the title compound, {[Mn6(C8H4O46(C4H9NO8]·H2O}n, two of the Mn atoms are six-coordinated by six O atoms from three benzene-1,4-dicarboxylate (bdc ligands and two trans DMA (dimethylacetamide molecules, whereas two other Mn atoms, located on inversion centers, are both in octahedral coordinations by six bdc O atoms. The discrete trinuclear manganese secondary building units (SBU of Mn3(O2CR6 ({–Mn—Mn—Mn-} are linked through bdc ligands, forming a chain, while the discrete trinuclear SBU of {–Mn—Mn—Mn-} are bridged, forming another chain]. The two types of chains are linked through bdc ligands, resulting in the formation of a layer with 36 topology. Weak O—H...O and O—H...N hydrogen-bonding interactions involving the disordered water molecule (half-occupation extend the two-dimensional layers into a three-dimensional supramolecular framework.

  12. Effect of 1,1-dimethylphenyl 1,4-piperazinium on mouse tracheal smooth muscle responsiveness.

    Science.gov (United States)

    Dorion, G; Israël-Assayag, E; Beaulieu, M J; Cormier, Y

    2005-06-01

    Bronchial hyperresponsiveness is one of the main features of asthma. A nicotinic receptor agonist, 1,1-dimethylphenyl 1,4-piperazinium (DMPP), has been shown to have an inhibitory effect on airway response to methacholine in an in vivo model of asthma. The aims of this study were to 1) verify whether nicotinic acetylcholine receptors (nAChR) were present on mouse tracheal smooth muscle, 2) verify whether bronchoprotection observed in mice was due to a direct effect on airway smooth muscle, and 3) compare the effects of nicotinic agonists to that of salbutamol. Alpha3-, alpha4-, and alpha7-nAChR subunits were detected by immunofluorescence on tracheal tissues from normal BALB/c mice. The effect of DMPP on tracheal responsiveness was verified by an isometric method. Tracheas were isolated from normal mice, placed in organ baths, and contracted with a single dose of methacholine. Cumulative doses of DMPP or salbutamol were added to the baths. Results show that mouse tracheal smooth muscle is positive for alpha4- and alpha7-nAChR subunits and that the epithelium is positive for alpha3-, alpha4-, and alpha7-subunits. DMPP induced a greater dose-dependent relaxation of tracheal smooth muscles precontracted with methacholine than with salbutamol. These results suggest that the smooth muscle-relaxing effect of DMPP could have some interest in the treatment of obstructive pulmonary diseases.

  13. 2,5-Difluoro-1,4-dimethoxybenzene for overcharge protection of secondary lithium batteries

    Energy Technology Data Exchange (ETDEWEB)

    Taggougui, M.; Carre, B.; Lemordant, D. [Laboratoire de Chimie des Interfaces et des Milieux Electrolytiques (EA2098), Universite de Tours, Faculte des Sciences et Techniques, Parc de Grandmont, F 37200 Tours (France); Willmann, P. [CNES, 18 Avenue E. Belin, 31055 Toulouse Cedex (France)

    2007-12-06

    Based on the voltammetric behaviour of a series of halogen-substituted dimethoxybenzene in 1 M LiPF{sub 6}/EC:DEC electrolyte, 2,5-difluoro-1,4-dimethoxybenzene (F{sub 2}DMB) was selected and tested as an electrolyte additive for overcharge protection of Li/Li{sub 4}Ti{sub 5}O{sub 12} cell. From the galvanostatic study of the cells at different overcharge current (C/20, C/50, C/100 and C/200) in the presence of F{sub 2}DMB, it was found that the shuttle additive can be adsorbed at the cathode surface and form a dense layer which prevents the intercalation of Li{sup +} ion in the positive electrode. At low overcharge current (C/200 rate) the voltage of the cell levelled off at the oxidation potential of the shuttle molecule for more than 50 cycles, but at higher charge rates (C/50 and C/100), the voltage of the cell was levelled off for only 16 cycles. The reason is that the F{sub 2}DMB molecules remaining in solution after the formation of the layer at the cathode cannot carry the current even at charge rates as low as C/100. (author)

  14. Redox-Active Tetraruthenium Macrocycles Built from 1,4-Divinylphenylene-Bridged Diruthenium Complexes.

    Science.gov (United States)

    Scheerer, Stefan; Linseis, Michael; Wuttke, Evelyn; Weickert, Sabrina; Drescher, Malte; Tröppner, Oliver; Ivanović-Burmazović, Ivana; Irmler, Andreas; Pauly, Fabian; Winter, Rainer F

    2016-07-01

    Metallamacrocylic tetraruthenium complexes were generated by treatment of 1,4-divinylphenylene-bridged diruthenium complexes with functionalized 1,3-benzene dicarboxylic acids and characterized by HR ESI-MS and multinuclear NMR spectroscopy. Every divinylphenylene diruthenium subunit is oxidized in two consecutive one-electron steps with half-wave potential splittings in the range of 250 to 330 mV. Additional, smaller redox-splittings between the +/2+ and 0/+ and the 3+/4+ and 2+/3+ redox processes, corresponding to the first and the second oxidations of every divinylphenylene diruthenium entity, are due to electrostatic effects. The lack of electronic coupling through bond or through space is explained by the nodal properties of the relevant molecular orbitals and the lateral side-by-side arrangement of the divinylphenylene linkers. The polyelectrochromic behavior of the divinylphenylene diruthenium precursors is retained and even amplified in these metallamacrocyclic structures. EPR studies down to T=4 K indicate that the dications 1-H(2+) and 1-OBu(2+) are paramagnetic. The dications and the tetracation of macrocycle 3-H display intense (dications) or weak (3-H(4+) ) EPR signals. Quantum chemical calculations indicate that the four most stable conformers of the macrocycles are largely devoid of strain. Bond parameters, energies as well as charge and spin density distributions of model macrocycle 5-H(Me) were calculated for the different charge and spin states.

  15. Climate applications for NOAA 1/4° Daily Optimum Interpolation Sea Surface Temperature

    Science.gov (United States)

    Boyer, T.; Banzon, P. V. F.; Liu, G.; Saha, K.; Wilson, C.; Stachniewicz, J. S.

    2015-12-01

    Few sea surface temperature (SST) datasets from satellites have the long temporal span needed for climate studies. The NOAA Daily Optimum Interpolation Sea Surface Temperature (DOISST) on a 1/4° grid, produced at National Centers for Environmental Information, is based primarily on SSTs from the Advanced Very High Resolution Radiometer (AVHRR), available from 1981 to the present. AVHRR data can contain biases, particularly when aerosols are present. Over the three decade span, the largest departure of AVHRR SSTs from buoy temperatures occurred during the Mt Pinatubo and El Chichon eruptions. Therefore, in DOISST, AVHRR SSTs are bias-adjusted to match in situ SSTs prior to interpolation. This produces a consistent time series of complete SST fields that is suitable for modelling and investigating local climate phenomena like El Nino or the Pacific warm blob in a long term context. Because many biological processes and animal distributions are temperature dependent, there are also many ecological uses of DOISST (e.g., coral bleaching thermal stress, fish and marine mammal distributions), thereby providing insights into resource management in a changing ocean. The advantages and limitations of using DOISST for different applications will be discussed.

  16. Quinoxaline 1, 4-di-N-oxides: Biological activities and mechanisms of actions

    Directory of Open Access Journals (Sweden)

    Guyue eCheng

    2016-03-01

    Full Text Available Quinoxaline 1, 4-di-N-oxides (QdNOs have manifold biological properties, including antimicrobial, antitumoral, antitrypanosomal and antiinflammatory/antioxidant activities. These diverse activities endow them broad applications and prospects in human and veterinary medicines. As QdNOs arouse widespread interest, the evaluation of their medicinal chemistry is still in progress. In the meantime, adverse effects have been reported in some of the QdNO derivatives. For example, genotoxicity and bacterial resistance have been found in QdNO antibacterial growth promoters, conferring urgent need for discovery of new QdNO drugs. However, the modes of actions of QdNOs are not fully understood, hindering the development and innovation of these promising compounds. Here, QdNOs are categorized based on the activities and usages, among which the antimicrobial activities are consist of antibacterial, antimycobacterial and anticandida activities, and the antiprotozoal activities include antitrypanosomal, antimalarial, antitrichomonas and antiamoebic activities. The structure-activity relationship and the mode of actions of each type of activity of QdNOs are summarized, and the toxicity and the underlying mechanisms are also discussed, providing insight for the future research and development of these fascinating compounds.

  17. Hexaaquacopper(II bis(tetrafluoridoborate–pyrazine 1,4-dioxide (1/3

    Directory of Open Access Journals (Sweden)

    Jan L. Wikaira

    2013-04-01

    Full Text Available The crystal structure of the title compound, [Cu(H2O6](BF42·3C4H4N2O2, comprises discrete [Cu(H2O6]2+ cations and BF4− anions along with three equivalents of pyrazine 1,4-dioxide (pzdo. The hexaaquacopper(II ion and all three pzdo molecules lie about crystallographic inversion centers. The lattice is supported by an extensive hydrogen-bonding network. O—H...O hydrogen bonding between the [Cu(H2O6]2+ and pzdo units creates a pseudo-hexagonal lattice parallel to the bc plane. The BF4− anions lie in the voids of that lattice, held in place by O—H...F hydrogen bonds, and also generate BF4−–pzdo–BF4−–pzdo stacks via short F...N contacts [2.866 (3–3.283 (4 Å].

  18. Investigations of 1-(4-propylamino-3-ethyl imidazolium tetrafluoroborate ionic liquid capturing CO2

    Directory of Open Access Journals (Sweden)

    Yang Lijuan

    2013-01-01

    Full Text Available 1-(4-propylamino-3-ethyl imidazolium ([Paeim]+ Tetrafluoroborate([BF4]- Ionic liquid (IL, capturing CO2, was explored systematically at B3LYP/6-311++G** and mp2/6-311++G** level. The stable geometries of ILs and capture products were optimized, the energies of these geometries were obtained and corrected by Zero-point-vibration-energy and basis set superposition error correction. The results show that the interactions between [Paeim]+and [BF4]-are mainly displayed as hydrogen bonds, but the interaction energies exceeds -328 kJ/mol. Further analysis found that the interactions are reinforced by charge dispersion and charge redistribution of ion-pair, and that electrostatic attraction contributes much to the interaction energies. This IL system capturing CO2belongs to the class of physical sorption with 1:1 molar absorption ratio, the absorption energy is nearly -18kJ/moland thus this IL may have low energy consumption when regenerated from IL-CO2.

  19. The inositol 1,4,5-trisphosphate receptor regulates autophagy through its interaction with Beclin 1.

    Science.gov (United States)

    Vicencio, J M; Ortiz, C; Criollo, A; Jones, A W E; Kepp, O; Galluzzi, L; Joza, N; Vitale, I; Morselli, E; Tailler, M; Castedo, M; Maiuri, M C; Molgó, J; Szabadkai, G; Lavandero, S; Kroemer, G

    2009-07-01

    The inositol 1,4,5-trisphosphate receptor (IP(3)R) is a major regulator of apoptotic signaling. Through interactions with members of the Bcl-2 family of proteins, it drives calcium (Ca(2+)) transients from the endoplasmic reticulum (ER) to mitochondria, thereby establishing a functional and physical link between these organelles. Importantly, the IP(3)R also regulates autophagy, and in particular, its inhibition/depletion strongly induces macroautophagy. Here, we show that the IP(3)R antagonist xestospongin B induces autophagy by disrupting a molecular complex formed by the IP(3)R and Beclin 1, an interaction that is increased or inhibited by overexpression or knockdown of Bcl-2, respectively. An effect of Beclin 1 on Ca(2+) homeostasis was discarded as siRNA-mediated knockdown of Beclin 1 did not affect cytosolic or luminal ER Ca(2+) levels. Xestospongin B- or starvation-induced autophagy was inhibited by overexpression of the IP(3)R ligand-binding domain, which coimmunoprecipitated with Beclin 1. These results identify IP(3)R as a new regulator of the Beclin 1 complex that may bridge signals converging on the ER and initial phagophore formation.

  20. Probing Interstellar Silicate Dust Grain Properties in Quasar Absorption Systems at Redshifts z<1.4

    CERN Document Server

    Aller, Monique C; York, Donald G; Welty, Daniel E; Vladilo, Giovanni; Som, Debopam

    2014-01-01

    Absorption lines in the spectra of distant quasars whose sightlines pass through foreground galaxies provide a valuable tool to probe the dust and gas compositions of the interstellar medium (ISM) in galaxies. The first evidence of silicate dust in a quasar absorption system (QAS) was provided through our detection of the 10 micron silicate feature in the z=0.52 absorber toward the quasar AO 0235+164. We present results from 2 follow-up programs using archival Spitzer Space Telescope infrared spectra to study the interstellar silicate dust grain properties in a total of 13 QASs at 0.11.4. We find clear detections of the 10 micron silicate feature in the QASs studied. We also detect the 18 micron silicate feature in the sources with adequate spectral coverage. We find variations in the breadth, peak wavelength, and substructure of the 10 micron interstellar silicate absorption features among the absorbers. This suggests that the silicate dust grain properties in these distant galaxies may differ relat...

  1. Functional and structural analyses of a 1,4-β-endoglucanase from Ganoderma lucidum.

    Science.gov (United States)

    Liu, Guizhi; Li, Qian; Shang, Na; Huang, Jian-Wen; Ko, Tzu-Ping; Liu, Weidong; Zheng, Yingying; Han, Xu; Chen, Yun; Chen, Chun-Chi; Jin, Jian; Guo, Rey-Ting

    2016-05-01

    Ganoderma lucidum is a saprotrophic white-rot fungus which contains a rich set of cellulolytic enzymes. Here, we screened an array of potential 1,4-β-endoglucanases from G. lucidum based on the gene annotation library and found that one candidate gene, GlCel5A, exhibits CMC-hydrolyzing activity. The recombinant GlCel5A protein expressed in Pichia pastoris is able to hydrolyze CMC and β-glucan but not xylan and mannan. The enzyme exhibits optimal activity at 60°C and pH 3-4, and retained 50% activity at 80 and 90°C for at least 15 and 10min. The crystal structure of GlCel5A and its complex with cellobiose, solved at 2.7 and 2.86Å resolution, shows a classical (β/α)8 TIM-barrel fold as seen in other members of glycoside hydrolase family 5. The complex structure contains a cellobiose molecule in the +1 and +2 subsites, and reveals the interactions with the positive sites of the enzyme. Collectively, the present work provides the first comprehensive characterization of an endoglucanase from G. lucidum that possesses properties for industrial applications, and strongly encourages further studying in the cellulolytic enzyme system of G. lucidum.

  2. System for Automated Geoscientific Analyses (SAGA) v. 2.1.4

    Science.gov (United States)

    Conrad, O.; Bechtel, B.; Bock, M.; Dietrich, H.; Fischer, E.; Gerlitz, L.; Wehberg, J.; Wichmann, V.; Böhner, J.

    2015-07-01

    The System for Automated Geoscientific Analyses (SAGA) is an open source geographic information system (GIS), mainly licensed under the GNU General Public License. Since its first release in 2004, SAGA has rapidly developed from a specialized tool for digital terrain analysis to a comprehensive and globally established GIS platform for scientific analysis and modeling. SAGA is coded in C++ in an object oriented design and runs under several operating systems including Windows and Linux. Key functional features of the modular software architecture comprise an application programming interface for the development and implementation of new geoscientific methods, a user friendly graphical user interface with many visualization options, a command line interpreter, and interfaces to interpreted languages like R and Python. The current version 2.1.4 offers more than 600 tools, which are implemented in dynamically loadable libraries or shared objects and represent the broad scopes of SAGA in numerous fields of geoscientific endeavor and beyond. In this paper, we inform about the system's architecture, functionality, and its current state of development and implementation. Furthermore, we highlight the wide spectrum of scientific applications of SAGA in a review of published studies, with special emphasis on the core application areas digital terrain analysis, geomorphology, soil science, climatology and meteorology, as well as remote sensing.

  3. Effect of Environmental Parameters on hydrogen Production using Clostridium Saccharoperbutylacetonicum N1-4(ATCC 13564

    Directory of Open Access Journals (Sweden)

    Walid M. Alalayah

    2009-01-01

    Full Text Available Problem statement: Hydrogen gas production by Clostridium can be improved by several ways through media formulation, or suitable environment condition. This study was carried out to investigate the environmental factors effects on hydrogen production using Clostridium saccharoperbutylacetonicum N1-4 (ATCC 13564. Approach: The environmental factor studied includes initial substrate concentration, initial medium pH, temperature, sparging nitrogen and addition of Fe2+. Results: The result showed that the best yield of hydrogen produced (YP/S was 3.10 moL (moL glucose-1 when an initial glucose concentration was 10 g L-1, initial pH 6.0±0.2 at temperature 37°C. The volume of hydrogen produced was decreased when higher initial glucose concentration was applied. The yield of hydrogen increased when Fe2+ added to medium at concentration of 25 mg L-1. The yield and growth were further increased by sparging with nitrogen gas. Conclusion: It was observed that the best condition for highest hydrogen yield when initial pH 6.0±0.2 at 37°C and enhanced by adding ferrous sulfate in anaerobic process.

  4. VizieR Online Data Catalog: ATLAS 1.4GHz Data Release 3 (Franzen+, 2015)

    Science.gov (United States)

    Franzen, T. M. O.; Banfield, J. K.; Hales, C. A.; Hopkins, A.; Norris, R. P.; Seymour, N.; Chow, K. E.; Herzog, A.; Huynh, M. T.; Lenc, E.; Mao, M. Y.; Middelberg, E.

    2016-04-01

    ATLAS covers two regions, each of ~3 deg2, surroundin (RA=03:30:16.3, DE=-28:05:12.4) and ELAIS-S1 (RA=00:33:50.8, DE=-43:44:57.4). These two fields have previously been observed at 1.4GHz as part of the ATLAS project and are described by Hales et al. (2014, Cat. J/MNRAS/441/2555). Both of these fields were originally targeted for radio observations as they overlap with SWIRE which includes infrared and optical data for the majority of the radio objects. ATCA project C1967 was allocated 1000h distributed over 78d between 2009 June and 2010 June to extend ATLAS. Previous ATLAS DR2 observations (ATCA Project IDs C1035 and C1241) from Hales et al. (2014, Cat. J/MNRAS/441/2555) were combined with our CABB observations to maximize the sensitivity. The data were combined in the image plane for reasons related to bandwidth smearing, and described in detail in Section 3.2. These data consist of two 128MHz bands centred at 1344 and 1432MHz each containing 16 channels of 8MHz in size. Both bands were imaged together using a similar procedure to the CABB data. (1 data file).

  5. Unaltered cosmic spherules in a 1.4-Gyr-old sandstone from Finland.

    Science.gov (United States)

    Deutsch, A; Greshake, A; Pesonen, L J; Pihlaja, P

    1998-09-10

    Micrometeorites-submillimetre-sized particles derived from asteroids and comets-occur in significant quantities in deep sea sediments, and the ice sheets of Greenland and Antarctica. The most abundant micrometeorites are cosmic spherules, which contain nickel-rich spinels that were crystallized and oxidized during atmospheric entry, therefore recording the oxygen content in the uppermost atmosphere. But the use of micrometeorites for detecting past changes in the flux of incoming extraterrestrial matter, and as probes of the evolution of the atmosphere, has been hampered by the fact that most objects with depositional ages higher than 0.5 Myr show severe chemical alteration. Here we report the discovery of unaltered cosmic spherules in a 1.4-Gyr-old sandstone (red bed) from Finland. From this we infer that red beds, a common lithology in the Earth's history, may contain substantial unbiased populations of fossil micrometeorites. The study of such populations would allow systematic research on variations in the micrometeorite flux from the early Proterozoic era to recent times (a time span of about 2.5 Gyr), and could help to better constrain the time when the atmospheric oxygen content was raised to its present level.

  6. System for Automated Geoscientific Analyses (SAGA) v. 2.1.4

    Science.gov (United States)

    Conrad, O.; Bechtel, B.; Bock, M.; Dietrich, H.; Fischer, E.; Gerlitz, L.; Wehberg, J.; Wichmann, V.; Böhner, J.

    2015-02-01

    The System for Automated Geoscientific Analyses (SAGA) is an open-source Geographic Information System (GIS), mainly licensed under the GNU General Public License. Since its first release in 2004, SAGA has rapidly developed from a specialized tool for digital terrain analysis to a comprehensive and globally established GIS platform for scientific analysis and modeling. SAGA is coded in C++ in an object oriented design and runs under several operating systems including Windows and Linux. Key functional features of the modular organized software architecture comprise an application programming interface for the development and implementation of new geoscientific methods, an easily approachable graphical user interface with many visualization options, a command line interpreter, and interfaces to scripting and low level programming languages like R and Python. The current version 2.1.4 offers more than 700 tools, which are implemented in dynamically loadable libraries or shared objects and represent the broad scopes of SAGA in numerous fields of geoscientific endeavor and beyond. In this paper, we inform about the system's architecture, functionality, and its current state of development and implementation. Further, we highlight the wide spectrum of scientific applications of SAGA in a review of published studies with special emphasis on the core application areas digital terrain analysis, geomorphology, soil science, climatology and meteorology, as well as remote sensing.

  7. Age-associated repression of type 1 inositol 1, 4, 5-triphosphate receptor impairs muscle regeneration

    Science.gov (United States)

    Lee, Bora; Lee, Seung-Min; Bahn, Young Jae; Lee, Kwang-Pyo; Kang, Moonkyung; Kim, Yeon-Soo; Woo, Sun-Hee; Lim, Jae-Young; Kim, Eunhee; Kwon, Ki-Sun

    2016-01-01

    Skeletal muscle mass and power decrease with age, leading to impairment of mobility and metabolism in the elderly. Ca2+ signaling is crucial for myoblast differentiation as well as muscle contraction through activation of transcription factors and Ca2+-dependent kinases and phosphatases. Ca2+ channels, such as dihydropyridine receptor (DHPR), two-pore channel (TPC) and inositol 1,4,5-triphosphate receptor (ITPR), function to maintain Ca2+ homeostasis in myoblasts. Here, we observed a significant decrease in expression of type 1 IP3 receptor (ITPR1), but not types 2 and 3, in aged mice skeletal muscle and isolated myoblasts, compared with those of young mice. ITPR1 knockdown using shRNA-expressing viruses in C2C12 myoblasts and tibialis anterior muscle of mice inhibited myotube formation and muscle regeneration after injury, respectively, a typical phenotype of aged muscle. This aging phenotype was associated with repression of muscle-specific genes and activation of the epidermal growth factor receptor (EGFR)-Ras-extracellular signal-regulated kinase (ERK) pathway. ERK inhibition by U0126 not only induced recovery of myotube formation in old myoblasts but also facilitated muscle regeneration after injury in aged muscle. The conserved decline in ITPR1 expression in aged human skeletal muscle suggests utility as a potential therapeutic target for sarcopenia, which can be treated using ERK inhibition strategies. PMID:27658230

  8. Spatially-resolved dust maps from Balmer decrements in galaxies at z~1.4

    CERN Document Server

    Nelson, Erica June; Momcheva, Ivelina G; Brammer, Gabriel B; Wuyts, Stijn; Franx, Marijn; Schreiber, Natascha M Forster; Whitaker, Katherine E; Skelton, Rosalind E

    2015-01-01

    We derive average radial gradients in the dust attenuation towards HII regions in 609 galaxies at z~1.4, using measurements of the Balmer decrement out to r~3kpc. The Balmer decrements are derived from spatially resolved maps of Halpha and Hbeta emission from the 3D-HST survey. We find that with increasing stellar mass (M) both the normalization and strength of the gradient in dust attenuation increases. Galaxies with a mean mass of = 9.2Msun have little dust attenuation at all radii, whereas galaxies with = 10.2Msun have dust attenuation toward Halpha A(Halpha)~2mag in their central regions. We parameterize this as A(Halpha) = b + c log(r), with b = 0.9 + 1.0 log(M10), c = -1.9 - 2.2 log(M10), r in kpc, and M10 the stellar mass in units of 10^10Msun. This expression can be used to correct spatially resolved measurements of Halpha to radial distributions of star formation. When applied to our data, we find that the star formation rates in the central r<1kpc of galaxies in the highest mass bin are ~ 6 Msun...

  9. A 3.1-4.8 GHz CMOS receiver for MB-OFDM UWB

    Energy Technology Data Exchange (ETDEWEB)

    Yang Guang; Yao Wang; Yin Jiangwei; Zheng Renliang; Li Wei; Li Ning; Ren Junyan, E-mail: w-li@fudan.edu.c [State Key Laboratory of ASIC and System, Fudan University, Shanghai 201203 (China)

    2009-01-15

    An integrated fully differential ultra-wideband CMOS receiver for 3.1-4.8 GHz MB-OFDM systems is presented. A gain controllable low noise amplifier and a merged quadrature mixer are integrated as the RF front-end. Five order Gm-C type low pass filters and VGAs are also integrated for both I and Q IF paths in the receiver. The ESD protected chip is fabricated in a Jazz 0.18 mum RF CMOS process and achieves a maximum total voltage gain of 65 dB, an AGC range of 45 dB with about 6 dB/step, an averaged total noise figure of 6.4 to 8.8 dB over 3 bands and an in-band IIP3 of -5.1 dBm. The receiver occupies 2.3 mm{sup 2} and consumes 110 mA from a 1.8 V supply including test buffers and a digital module.

  10. Cadmium(II)-1,4-phenylenediacetate Complex with Green Luminescence

    Institute of Scientific and Technical Information of China (English)

    XU Yan-Qing; ZHOU You-Fu; YUAN Da-Qiang; HONG Mao-Chun

    2006-01-01

    The title complex, formulated as {[Cd(pda)(phen)]·3H2O}n 1 (pda = 1,4-pheny-lenediacetate, phen = 1,10'-phenanthroline), has been hydrothermally synthesized and determim- ned by X-ray crystallography. Crystallographic data: triclinic, space group P-1, a = 10.375 (7), b = 10.435(1), c = 12.040(1) (A),α = 68.503(1),β = 86.371(1),γ = 66.231(1)°, Mr = 538.82, V = 1104.5(8) (A)3, Z = 2, Dc = 1.620 g/cm3, μ = 1.035 mm-1, F(000) = 544, the final R = 0.0380 and wR = 0.0985 (w = 1/[σ2(Fo2) + (0.0559P)2 + 1.5319P], where P = (Fo2 + 2Fc2)/3) based on 3444 observed reflections with I >2σ(I). Complex 1 features a two-dimensional layer. Fluorescent analysis reveals that it exhibits intense green luminescence with the maximum at around 516 nm.

  11. Radio variability in the Phoenix Deep Survey at 1.4GHz

    CERN Document Server

    Hancock, Paul; Bell, Martin; Murphy, Tara; Gaensler, Bryan

    2016-01-01

    We use archival data from the Phoenix Deep Survey to investigate the variable radio source population above 1mJy/beam at 1.4GHz. Given the similarity of this survey to other such surveys we take the opportunity to investigate the conflicting results which have appeared in the literature. Two previous surveys for variability conducted with the Very Large Array (VLA) achieved a sensitivity of 1mJy/beam. However, one survey found an areal density of radio variables on timescales of decades that is a factor of ~4 times greater than a second survey which was conducted on timescales of less than a few years. In the Phoenix deep field we measure the density of variable radio sources to be $\\rho =0.98\\mathrm{deg}^{-2}$ on timescales of 6 months to 8 years. We make use of WISE infrared cross-ids, and identify all variable sources as an AGN of some description. We suggest that the discrepancy between previous VLA results is due to the different time scales probed by each of the surveys, and that radio variability at 1....

  12. 2,2′-(Piperazine-1,4-diyldiethanaminium dibenzoate

    Directory of Open Access Journals (Sweden)

    Ignacy Cukrowski

    2012-08-01

    Full Text Available The asymmetric unit of the title salt C8H22N42+·2C7H5O2−, comprises two independent pairs of half a 2,2′-(piperazine-1,4-diyldiethanaminium dication plus a benzoate anion. The dications are symmetrical and lie across crystallographic centres of inversion. The crystal structure was refined as a two-component pseudo-merohedral twin using the twin law 001 0-10 100 [he domain fractions are 0.8645 (8 and 0.1355 (8]. The anions and cations are linked by N—H...O hydrogen bonds and weak N—H...O intermolecular interactions to form infinite two-dimensional networks parallel to [101]. The conformation adopted by the cation in the crystal structure is very similar to that adopted by the same cation in the structures of the 2-hydroxybenzoate [Cukrowski et al. (2012. Acta Cryst, E68, o2387], the nitrate and the tetrahydrogen pentaborate salts.

  13. Deep near-infrared spectroscopy of passively evolving galaxies at z>1.4

    CERN Document Server

    Onodera, M; Carollo, M; Cappellari, M; Mancini, C; Strazzullo, V; Daddi, E; Arimoto, N; Gobat, R; Yamada, Y; McCracken, H J; Ilbert, O; Capak, P; Cimatti, A; Giavalisco, M; Koekemoer, A M; Kong, X; Lilly, S; Motohara, K; Ohta, K; Sanders, D B; Scoville, N; Tamura, N; Taniguchi, Y

    2012-01-01

    [Abridged] We present the results of new near-IR spectroscopic observations of passive galaxies at z>1.4 in a concentration of BzK-selected galaxies in the COSMOS field. The observations have been conducted with Subaru/MOIRCS, and have resulted in absorption lines and/or continuum detection for 18 out of 34 objects. This allows us to measure spectroscopic redshifts for a sample almost complete to K(AB)=21. COSMOS photometric redshifts are found in fair agreement overall with the spectroscopic redshifts, with a standard deviation of ~0.05; however, ~30% of objects have photometric redshifts systematically underestimated by up to ~25%. We show that these systematic offsets in photometric redshifts can be removed by using these objects as a training set. All galaxies fall in four distinct redshift spikes at z=1.43, 1.53, 1.67 and 1.82, with this latter one including 7 galaxies. SED fits to broad-band fluxes indicate stellar masses in the range of ~4-40x10^10Msun and that star formation was quenched ~1 Gyr before...

  14. 1,4-萘二酸银配合物的合成与性质表征%Synthesis, Structure and Properties of Silver(Ⅰ) Complexes With 1,4-Naphthalenedicarboxylic Acid Ligand

    Institute of Scientific and Technical Information of China (English)

    黄辉

    2014-01-01

    简要概述了1,4-萘二酸银配合物的合成和晶体结构的分析,并对银配合物的研究进展进行了概括.通过溶液法以银盐,1,4-萘二酸和含氮杂环配体合成两个配位聚合物:[Ag4(1,4-ndc)(5-methy-2-apy)4]n(1)、[Ag4(1,4-ndc)2(5-methy-2-apy)4]n·0.5 nCH3CN(2).对这两个配合物进行了红外、X-单晶衍射等结构表征,并对配合物进行了热重的测量.

  15. Correlation of the Serum Level of Carcinoembryonic Antigen and Prolactin with Different Stages of Colorectal Carcinoma According to Dukes' Staging.

    Science.gov (United States)

    Rahman, M R; Sheikh, S H; Lima, I J; Islam, M R; Faisal, M; Islam, M S; Faruk, M O; Jalal, M T

    2016-01-01

    Carcinoembryonic antigen (CEA) is well established tumor marker for colorectal cancers worldwide. Recent studies show that serum prolactin level is also raised in colorectal cancers. The purpose of the study is to evaluate the correlation of serum CEA and Prolactin with Dukes' staging of colorectal carcinomas. Between January 2013 and June 2013, Serum CEA and Serum Prolactin were measured by radioimmunoassay from 103 patients who were histopathologically diagnosed as colorectal carcinomas. Evaluation of the stages of the colorectal cancers was done on the basis of preoperative investigations and postoperative histopathology and correlated with Preoperative Serum CEA and Serum Prolactin. Results were presented as median value, range and percentage. Male to female ratio was 1.4:1 with median age of 42.26 years (range 17-78 years). Most of the patients in this series presented with carcinoma rectum (42%). Most of the patients (52%) were found in Dukes' stage C and 27% and 15% cases were found as Dukes' stage B and Dukes' stage D respectively. Stage of the disease is directly proportionate to percentage of the patient with high serum prolactin except early stage (Dukes' A-50%, Dukes' B-28.6%, Dukes' C-33.3% & Dukes' D-46.7%). Similarly serum CEA level is directly proportionate to tumor stage (Dukes' A-0%, Dukes' B-32%, Dukes' C-40.7% & Dukes' D-74.7%). A preoperative high serum CEA value suggests advanced disease either locally or with distant metastasis. In contrast preoperative high serum prolactin (hyperprolactinaemia) did not suggest advanced disease as it can be elevated even in early stage of disease. Serum CEA and Serum Prolactin both are valuable tumor markers but serum CEA could not be replaced by serum Prolactin. Serum Prolactin may be a helpful marker in earlier stages of the colorectal cancer.

  16. 1, 4-Pyrone Effects on O-H Bond Dissociation Energies of Catechols in Flavonoids: A Density Functional Theory Study

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Through B3LYP/6-31G** calculations, the 1, 4-pyrone effects on O-H bond dissociation energies (BDEs) of catechols in rings A or B of flavonoids were investigated. For the catechol in ring A, although 1, 4-pyrone enlarged the conjugation system, its electron-withdrawing property increased the O-H BDE 3 ( 4.184 kJ/mol compared with that of catechol. However, for the catechol in ring B, 1, 4-pyrone was poorly conjugated with the moiety, and therefore, had little effect on the O-H BDE.

  17. Short-chain grafting of tetrahydrofuran and 1,4-dioxane cycles on vinylchloride-maleic anhydride copolymer

    Directory of Open Access Journals (Sweden)

    2009-01-01

    Full Text Available Mass increase of vinylchloride-maleic anhydride (VC-MA copolymer samples aged in tetrahydrofuran (THF or in 1,4-dioxane results from chemical interaction of VC-MA macromolecules with 1,4-dioxane or THF. Microstructure of the products of such modification was proved by infrared spectroscopy (IR- and nuclear magnetic resonance spectroscopy (13C NMR and 1H NMR. Mechanism of modification has been proposed. The results of microstructure research of VC-MA samples aged in THF and in 1,4-dioxane coincide with already known data on the reactions of opening of these and other oxygen-containing cycles under mild conditions.

  18. Substitutions of Fluorine Atoms and Phenoxy Groups in the Synthesis of Quinoxaline 1,4-di-N-oxide Derivatives

    Directory of Open Access Journals (Sweden)

    Antonio Monge

    2008-01-01

    Full Text Available The unexpected substitution of fluorine atoms and phenoxy groups attached toquinoxaline or benzofuroxan rings is described. The synthesis of 2-benzyl- and 2-phenoxy-3-methylquinoxaline 1,4-di-N-oxide derivatives was based on the classical Beirut reaction.The tendency of fluorine atoms linked to quinoxaline or benzofuroxan rings to be replacedby a methoxy group when dissolved in an ammonia saturated solution of methanol wasclearly demonstrated. In addition, 2-phenoxyquinoxaline 1,4-di-N-oxide derivativesbecame 2-aminoquinoxaline 1,4-di-N-oxide derivatives in the presence of gaseousammonia.

  19. A Convenient and Efficient Route to 1,4-Bis(heteroaryl)buta-1,3-diene and 4-Heteroarylbut-1-en-3-yne from 1,4-Dichlorobut-2-yne

    Institute of Scientific and Technical Information of China (English)

    ZHANG Xiao-Ming; WU Guo-Qiang; CHEN Wan-Zhi

    2007-01-01

    A convenient and practical route to functionalized conjugated 1,3-enynes and 1,3-dienes is described.1,4-Bis(heteroaryl)-1,3-diene and 1-heteroarylbut-1-en-3-yne derivatives were prepared from 1,4-dichloro-2-buty'ne and corresponding N-heteroarenes such as imidazole, pyrrole, pyrazole and indole derivatives in the presence of bases in good to high yields.

  20. Material Property Correlations: Comparisons between FRAPCON-3.4, FRAPTRAN 1.4, and MATPRO

    Energy Technology Data Exchange (ETDEWEB)

    Luscher, Walter G.; Geelhood, Kenneth J.

    2010-08-01

    Sections 3 and 4, respectively. In addition to describing the material property correlations used in the subroutines of FRAPCON-3 and FRAPTRAN, this report also provides a variety of comparisons between material property correlations and data. Although they are frequently identical, comparisons are made between the material property correlations used in the FRAPCON-3 and FRAPTRAN codes. Comparisons are also made between the material property correlations used in MATPRO, a compilation of fuel and cladding material property correlations with an extensive history of used with various fuel performance and severe accident codes. For a number of reasons, consistency between the material property correlations in FRAPCON-3, FRAPTRAN, and MATPRO has never been complete. However, the current versions of FRAPCON-3 and FRAPTRAN use a relatively consistent set of correlations for the properties that are used by both codes. The material property correlations in the most recent version of MATPRO are documented in Volume 4 of NUREG/CR-6150. In addition to comparison of the various correlations, correlation-to-data comparisons are also made with FRAPCON-3, FRAPTRAN, and MATPRO. All comparisons made in this report are based on the material property correlations used in the most recent version of the FRAPCON-3 and FRAPTRAN codes, FRAPCON-3.4 and FRAPTRAN 1.4. The source code for each material property correlation discussed will be provided for FRAPCON-3.4 and FRAPTRAN 1.4 (see appendix) as well as a range of applicability and an estimate of uncertainty where possible.

  1. Isothermal flow measurement using planar PIV in the 1/4 scaled model of CANDU reactor

    Energy Technology Data Exchange (ETDEWEB)

    Im, Sunghyuk; Sung, Hyung Jin [KAIST, Daejeon (Korea, Republic of); Seo, Han; Bang, In Cheol [UNIST, Ulsan (Korea, Republic of); Kim, Hyoung Tae [KAERI, Daejeon (Korea, Republic of)

    2015-05-15

    The local temperature of the moderator is a key parameter in determining the available subcooling. To predict the flow field and local temperature distribution in the calandria, Korea Atomic Energy Research Institute (KAERI) started the experimental research on moderator circulation as one of a national R and D research programs from 2012. This research program includes the construction of the Moderator Circulation Test (MCT) facility, production of the validation data for self-reliant CFD tools, and development of optical measurement system using the Particle Image Velocimetry (PIV) and Laser Induced Fluorescence (LIF) techniques. Small-scale 1/40 and 1/8 small-scale model tests were performed prior to installation of the main MCT facility to identify the potential problems of the flow visualization and measurement expected in the 1/4 scale MCT facility. In the 1/40 scale test, a flow field was measured with a PIV measurement technique under an iso-thermal state, and the temperature field was visualized using a LIF technique. In this experiment, the key point was to illuminate the region of interest as uniformly as possible since the velocity and temperature fields in the shadow regions were distorted and unphysical. In the 1/8 scale test, the flow patterns from the inlet nozzles to the top region of the tank were investigated using PIV measurement at two different positions of the inlet nozzle. For each position of laser beam exposure the measurement sections were divided to 7 groups to overcome the limitation of the laser power to cover the relatively large test section. The MCT facility is the large-scale facility designed to reproduce the important characteristics of moderator circulation in a CANDU6 calandria under a range of operating conditions. It is reduced in a 1/4 scale and a moderator test vessel is built to the specifications of the CANDU6 reactor design, where a working fluid is sub-cooled water with atmospheric pressure. Previous studies were

  2. Functional inositol 1,4,5-trisphosphate receptors assembled from concatenated homo- and heteromeric subunits.

    Science.gov (United States)

    Alzayady, Kamil J; Wagner, Larry E; Chandrasekhar, Rahul; Monteagudo, Alina; Godiska, Ronald; Tall, Gregory G; Joseph, Suresh K; Yule, David I

    2013-10-11

    Vertebrate genomes code for three subtypes of inositol 1,4,5-trisphosphate (IP3) receptors (IP3R1, -2, and -3). Individual IP3R monomers are assembled to form homo- and heterotetrameric channels that mediate Ca(2+) release from intracellular stores. IP3R subtypes are regulated differentially by IP3, Ca(2+), ATP, and various other cellular factors and events. IP3R subtypes are seldom expressed in isolation in individual cell types, and cells often express different complements of IP3R subtypes. When multiple subtypes of IP3R are co-expressed, the subunit composition of channels cannot be specifically defined. Thus, how the subunit composition of heterotetrameric IP3R channels contributes to shaping the spatio-temporal properties of IP3-mediated Ca(2+) signals has been difficult to evaluate. To address this question, we created concatenated IP3R linked by short flexible linkers. Dimeric constructs were expressed in DT40-3KO cells, an IP3R null cell line. The dimeric proteins were localized to membranes, ran as intact dimeric proteins on SDS-PAGE, and migrated as an ∼1100-kDa band on blue native gels exactly as wild type IP3R. Importantly, IP3R channels formed from concatenated dimers were fully functional as indicated by agonist-induced Ca(2+) release. Using single channel "on-nucleus" patch clamp, the channels assembled from homodimers were essentially indistinguishable from those formed by the wild type receptor. However, the activity of channels formed from concatenated IP3R1 and IP3R2 heterodimers was dominated by IP3R2 in terms of the characteristics of regulation by ATP. These studies provide the first insight into the regulation of heterotetrameric IP3R of defined composition. Importantly, the results indicate that the properties of these channels are not simply a blend of those of the constituent IP3R monomers.

  3. Proteolytic fragmentation of inositol 1,4,5-trisphosphate receptors: a novel mechanism regulating channel activity?

    Science.gov (United States)

    Wang, Liwei; Alzayady, Kamil J; Yule, David I

    2016-06-01

    Inositol 1,4,5-trisphosphate receptors (IP3 Rs) are a family of ubiquitously expressed intracellular Ca(2+) release channels. Regulation of channel activity by Ca(2+) , nucleotides, phosphorylation, protein binding partners and other cellular factors is thought to play a major role in defining the specific spatiotemporal characteristics of intracellular Ca(2+) signals. These properties are, in turn, believed pivotal for the selective and specific physiological activation of Ca(2+) -dependent effectors. IP3 Rs are also substrates for the intracellular cysteine proteases, calpain and caspase. Cleavage of the IP3 R has been proposed to play a role in apoptotic cell death by uncoupling regions important for IP3 binding from the channel domain, leaving an unregulated leaky Ca(2+) pore. Contrary to this hypothesis, we demonstrate following proteolysis that N- and C-termini of IP3 R1 remain associated, presumably through non-covalent interactions. Further, we show that complementary fragments of IP3 R1 assemble into tetrameric structures and retain their ability to be regulated robustly by IP3 . While peptide continuity is clearly not necessary for IP3 -gating of the channel, we propose that cleavage of the IP3 R peptide chain may alter other important regulatory events to modulate channel activity. In this scenario, stimulation of the cleaved IP3 R may support distinct spatiotemporal Ca(2+) signals and activation of specific effectors. Notably, in many adaptive physiological events, the non-apoptotic activities of caspase and calpain are demonstrated to be important, but the substrates of the proteases are poorly defined. We speculate that proteolytic fragmentation may represent a novel form of IP3 R regulation, which plays a role in varied adaptive physiological processes.

  4. Crystal structures of β-1,4-galactosyltransferase 7 enzyme reveal conformational changes and substrate binding.

    Science.gov (United States)

    Tsutsui, Yuko; Ramakrishnan, Boopathy; Qasba, Pradman K

    2013-11-01

    The β-1,4-galactosyltransferase 7 (β4GalT7) enzyme is involved in proteoglycan synthesis. In the presence of a manganese ion, it transfers galactose from UDP-galactose to xylose on a proteoglycan acceptor substrate. We present here the crystal structures of human β4GalT7 in open and closed conformations. A comparison of these crystal structures shows that, upon manganese and UDP or UDP-Gal binding, the enzyme undergoes conformational changes involving a small and a long loop. We also present the crystal structures of Drosophila wild-type β4GalT7 and D211N β4GalT7 mutant enzymes in the closed conformation in the presence of the acceptor substrate xylobiose and the donor substrate UDP-Gal, respectively. To understand the catalytic mechanism, we have crystallized the ternary complex of D211N β4GalT7 mutant enzyme in the presence of manganese with the donor and the acceptor substrates together in the same crystal structure. The galactose moiety of the bound UDP-Gal molecule forms seven hydrogen bonds with the protein molecule. The nonreducing end of the xylose moiety of xylobiose binds to the hydrophobic acceptor sugar binding pocket created by the conformational changes, whereas its extended xylose moiety forms hydrophobic interactions with a Tyr residue. In the ternary complex crystal structure, the nucleophile O4 oxygen atom of the xylose molecule is found in close proximity to the C1 and O5 atoms of the galactose moiety. This is the first time that a Michaelis complex of a glycosyltransferase has been described, and it clearly suggests an SN2 type catalytic mechanism for the β4GalT7 enzyme.

  5. PAI-1 4G/5G polymorphism and coronary artery disease risk: a meta-analysis.

    Science.gov (United States)

    Liang, Zhongshu; Jiang, Weihong; Ouyang, Mao; Yang, Kan

    2015-01-01

    Many epidemiologic studies have investigated the plasminogen activator inhibitor-1 (PAI-1) gene 4G/5G polymorphism and this association with coronary artery disease (CAD). But definite conclusions can not be drawn. Related studies were identified from PubMed, Springer Link, Ovid, Chinese Wanfang Data Knowledge Service Platform, Chinese National Knowledge Infrastructure (CNKI), and Chinese Biology Medicine (CBM) till 10 August 2014. Pooled ORs and 95% CIs were used to assess the strength of the associations. A total of 53 studies including 20921 CAD cases and 18434 controls were included. Significantly elevated CAD risk was found in overall analysis (OR = 1.13, 95% CI: 1.05-1.21, P = 0.0009). In the subgroup analysis by races, significantly increased risk was found in Caucasians (OR = 1.11, 95% CI: 1.03-1.20, P = 0.005) and Asians (OR = 1.20, 95% CI: 1.01-1.42, P = 0.04). In the subgroup analysis by gender, significant association was found in males (OR = 1.15, 95% CI: 1.06-1.25, P = 0.0008), but was not found in females (OR = 1.05, 95% CI: 0.92-1.20, P = 0.47). In the subgroup analysis by age, young populations showed increased CAD risk (OR = 1.19, 95% CI: 1.02-1.37, P = 0.02), but old populations did not show this association (OR = 1.01, 95% CI: 0.82-1.24, P = 0.93). This meta-analysis provides the evidence that PAI-1 4G/5G polymorphism may contribute to the CAD development.

  6. Measurements of a 1/4-scale model of an explosives firing chamber

    Energy Technology Data Exchange (ETDEWEB)

    Pastrnak, J.W.; Baker, C.F.; Simmons, L.F.

    1995-01-27

    In anticipation of increasingly stringent environmental regulations, Lawrence Livermore National Laboratory (LLNL) proposes to construct a 60-kg firing chamber to provide blast-effects containment for most of its open-air, high-explosive, firing operations. Even though these operations are within current environmental limits, containment of the blast effects and hazardous debris will further drastically reduce emissions to the environment and minimize the generated hazardous waste. The major design consideration of such a chamber is its overall structural dynamic response in terms of long-term containment of all blast effects from repeated internal detonations of high explosives. Another concern is how much other portions of the facility outside the firing chamber must be hardened to ensure personnel protection in the event of an accidental detonation while the chamber door is open. To assess these concerns, a 1/4-scale replica model of the planned contained firing chamber was designed, constructed, and tested with scaled explosive charges ranging from 25 to 125% of the operational explosives limit of 60 kg. From 16 detonations of high explosives, 880 resulting strains, blast pressures, and temperatures within the model were measured to provide information for the final design. Factors of safety for dynamic yield of the firing chamber structure were calculated and compared to the design criterion of totally elastic response. The rectangular, reinforced-concrete chamber model exhibited a lightly damped vibrational response that placed the structure in alternating cycles of tension and compression. During compression, both the reinforcing steel and the concrete remained elastic.

  7. The levels of polychlorinated biphenyls in 1,4-dichlorobenzene mothballs

    Energy Technology Data Exchange (ETDEWEB)

    Liu, Wenbin; Zheng, Minghui; Xing, Ying; Wang, Dongshen; Zhao, Xingru; Gao, Lirong [Chinese Academy of Sciences, Beijing (China). Key laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences

    2004-09-15

    The chemical 1,4-dichlorobenzene (p-DCB), also called paramoth, is one of the chemicals commonly used to make mothballs. For the more than 20 years, p-DCB has been used principally (35-55% of all uses) as a space deodorant for toilets and refuse containers, and as a fumigant for control of moths, molds, and mildews. The process of production of p-DCB currently used by industry is direct chlorination of benzene or chlorobenzene in the presence of a Friedel-Crafts catalyst (typically FeCl{sub 3}), and the pure products of p-DCB are obtained by distillation and crystallization from the mixture of polychlorinated benzenes. This process is similar to that of production of PCBs which were manufactured commercially by the progressive chlorination of biphenyl in the presence of a suitable catalyst, e.g., iron chloride. However, few studies on the formation of PCBs from chlorobenzenes have been published. Buser reported significant quantities of PCDFs and a small amount of PCDDs, PCBs, and chlorophenols were formed in the pyrolysis of chlorobenzenes at 620 C. Peng-Yan Liu et al. revealed that lower chlorinated benzenes produce more PCBs than higher ones. Nevertheless, prior to this study, no reports on PCBs in p-DCB and the restriction of PCBs in p-DCB products have been found. In this paper, the occurrence and distribution of dioxin-like PCBs and total PCBs in some commercial p-DCB mothballs are investigated. Except of the toxic of p-DCB, the low concentration of PCBs in p-DCB mothballs should not be negligible.

  8. Tasmania in Nuna: Witness to a ~1.4 Ga East Antarctica-Laurentia Connection

    Science.gov (United States)

    Halpin, J. A.; Mulder, J. A.; Daczko, N. R.

    2015-12-01

    Most recent reconstructions of the supercontinent Nuna juxtapose the North Australian craton, Mawson continent (South Australia-East Antarctica), and Laurentia between 1.6 Ga and 1.3 Ga, but differ in their relative positioning. Tasmania (SE Australia) has not been considered in previous Nuna reconstructions. Prior to late Neoproterozoic rifting, this crustal fragment was likely part of the eastern margin of East Antarctica. The significance of Tasmania's position within Nuna has recently been highlighted with the discovery that the majority of a >10-km-thick marine shelfal package exposed in northwest Tasmania (Rocky Cape Group) was deposited between 1.45 and 1.30 Ga. The detrital zircon signatures of these strata are distinct from other Mesoproterozoic basins in Australia, and instead closely resemble time-equivalent upper parts of the Belt-Purcell Basin of Laurentia, suggesting correlations within Nuna. We investigate the provenance of the Rocky Cape Group quartzites by comparing new detrital zircon U-Pb-Hf isotopic data to an extensive compilation of zircon data from Australia, East Antarctica, and Laurentia. Our analysis demonstrates that the Rocky Cape Group is unlikely to have been sourced from any geological terrane exposed in present-day Australia. Instead, zircon isotopic signatures from basement terranes in Laurentia and East Antarctica show striking similarities to the Rocky Cape Group detrital signature. Paleocurrent data indicate a northwest-southeast-trending paleoshoreline
and suggest that the majority of sediment was sourced from Paleoproterozoic crust in SW Laurentia, which was to the southeast (present-day coordinates) of Tasmania. These new data support a SWEAT-like (southwest United States-East Antarctica) configuration for Nuna. We suggest that rifting propagated southward from ca. 1.4 Ga, leaving a thinned continental connection between East Antarctica and southwest Laurentia onto which the lower-middle RCG was deposited prior to 1.3 Ga.

  9. Community Intercomparison Suite (CIS) v1.4.0: a tool for intercomparing models and observations

    Science.gov (United States)

    Watson-Parris, Duncan; Schutgens, Nick; Cook, Nicholas; Kipling, Zak; Kershaw, Philip; Gryspeerdt, Edward; Lawrence, Bryan; Stier, Philip

    2016-09-01

    The Community Intercomparison Suite (CIS) is an easy-to-use command-line tool which has been developed to allow the straightforward intercomparison of remote sensing, in situ and model data. While there are a number of tools available for working with climate model data, the large diversity of sources (and formats) of remote sensing and in situ measurements necessitated a novel software solution. Developed by a professional software company, CIS supports a large number of gridded and ungridded data sources "out-of-the-box", including climate model output in NetCDF or the UK Met Office pp file format, CloudSat, CALIOP (Cloud-Aerosol Lidar with Orthogonal Polarization), MODIS (MODerate resolution Imaging Spectroradiometer), Cloud and Aerosol CCI (Climate Change Initiative) level 2 satellite data and a number of in situ aircraft and ground station data sets. The open-source architecture also supports user-defined plugins to allow many other sources to be easily added. Many of the key operations required when comparing heterogenous data sets are provided by CIS, including subsetting, aggregating, collocating and plotting the data. Output data are written to CF-compliant NetCDF files to ensure interoperability with other tools and systems. The latest documentation, including a user manual and installation instructions, can be found on our website (http://cistools.net). Here, we describe the need which this tool fulfils, followed by descriptions of its main functionality (as at version 1.4.0) and plugin architecture which make it unique in the field.

  10. The electrochemical reduction of 1,4-dichloroazoethanes: Reductive elimination of chloride to form aryl azines

    Energy Technology Data Exchange (ETDEWEB)

    Sauro, Vittorio A.; Magri, David C.; Pitters, Jason L. [Department of Chemistry, University of Western Ontario, London, ON, N6A 5B7 (Canada); Workentin, Mark S., E-mail: mworkent@uwo.c [Department of Chemistry, University of Western Ontario, London, ON, N6A 5B7 (Canada)

    2010-08-01

    Graphical abstract: -- Abstract: A series of 1,4-dichloroazoethanes (1-X/Y, X and Y = 4-NO{sub 2}, 4-CN, 4-CH{sub 3} or 4-H) were studied in N,N-dimethylformamide using cyclic voltammetry, constant potential sweep voltammetry (CPSW) and constant potential electrolysis. The voltammograms of 1-X/Y exhibit an irreversible two-electron wave corresponding to dissociative electron transfer (DET) reduction of the carbon-chlorine bond resulting in formation of the azines 2-X/Y in quantitative yield. Additional redox waves correspond to the reversible reduction of the azines to the 2-X/Y{center_dot}{sup -} radical anion and 2-X/Y{sup 2-} dianion consecutively, with the exception of 1-NO{sub 2}/NO{sub 2} where both NO{sub 2} groups are reduced simultaneously in a two-electron reversible wave. Thermodynamic and kinetic parameters were determined from CPSW: the standard reduction potentials (E{sup o}) vary between -0.7 and -1.3 V versus SCE as a function of electron-withdrawing substituent; the heterogeneous rate constants (k{sub het}) are consistent with a slow heterogeneous electron transfer with values ranging from 10{sup -3} to 10{sup -5} cm s{sup -1}; the transfer coefficients ({alpha}) for 1-NO{sub 2}/NO{sub 2} and 1-NO{sub 2}/H are greater than 0.5, indicative of a stepwise DET mechanism for the C-Cl bond cleavage while the remaining 1-X/Y compounds have {alpha} values between 0.35 and 0.5, and the intrinsic barriers are all significantly lower than predicted for a concerted DET, thereby also suggesting a stepwise DET mechanism.

  11. Hydrogen peroxide down-regulates inositol 1,4,5-trisphosphate receptor content through proteasome activation.

    Science.gov (United States)

    Martín-Garrido, A; Boyano-Adánez, M C; Alique, M; Calleros, L; Serrano, I; Griera, M; Rodríguez-Puyol, D; Griendling, K K; Rodríguez-Puyol, M

    2009-11-15

    Hydrogen peroxide (H(2)O(2)) is implicated in the regulation of signaling pathways leading to changes in vascular smooth muscle function. Contractile effects produced by H(2)O(2) are due to the phosphorylation of myosin light chain kinase triggered by increases in intracellular calcium (Ca(2+)) from intracellular stores or influx of extracellular Ca(2+). One mechanism for mobilizing such stores involves the phosphoinositide pathway. Inositol 1,4,5-trisphosphate (IP(3)) mobilizes intracellular Ca(2+) by binding to a family of receptors (IP(3)Rs) on the endoplasmic-sarcoplasmic reticulum that act as ligand-gated Ca(2+) channels. IP(3)Rs can be rapidly ubiquitinated and degraded by the proteasome, causing a decrease in cellular IP(3)R content. In this study we show that IP(3)R(1) and IP(3)R(3) are down-regulated when vascular smooth muscle cells (VSMC) are stimulated by H(2)O(2), through an increase in proteasome activity. Moreover, we demonstrate that the decrease in IP(3)R by H(2)O(2) is accompanied by a reduction in calcium efflux induced by IP(3) in VSMC. Also, we observed that angiotensin II (ANGII) induces a decrease in IP(3)R by activation of NADPH oxidase and that preincubation with H(2)O(2) decreases ANGII-mediated calcium efflux and planar cell surface area in VSMC. The decreased IP(3) receptor content observed in cells was also found in aortic rings, which exhibited a decreased ANGII-dependent contraction after treatment with H(2)O(2). Altogether, these results suggest that H(2)O(2) mediates IP(3)R down-regulation via proteasome activity.

  12. Measurements of a 1/4-scale model of a 60-kg explosives firing chamber

    Energy Technology Data Exchange (ETDEWEB)

    Pastrnak, J.W.; Baker, C.F.; Simmons, L.F.

    1995-01-27

    In anticipation of increasingly stringent environmental regulations, Lawrence Livermore National Laboratory (LLNL) proposes to construct a 60-kg firing chamber to provide blast-effects containment for, most of its open-air, high-explosive, firing operations. Even though these operations are within current environmental limits, containment of the blast effects and hazardous debris will further drastically reduce emissions to the environment and minimize the generated hazardous waste. The major design consideration of such a chamber is its overall structural dynamic response in terms of long-term containment of all blast effects from repeated internal detonations of high explosives. Another concern is how much other portions of the facility must be hardened to ensure personnel protection in the event of an accidental detonation. To assess these concerns, a 1/4-scale replica model of the planned contained firing chamber was designed, constructed, and tested with scaled explosive charges ranging from 25 to 125% of the operational explosives limit of 60 kg. From 16 detonations of high explosives, 880 resulting strains, blast pressures, and temperatures within the model were measured. Factors of safety for dynamic yield of the firing chamber structure were calculated and compared to the design criterion of totally elastic response. The rectangular, reinforced-concrete chamber model exhibited a lightly damped vibrational response that placed the structure in alternating cycles of tension and compression. During compression, both the reinforcing steel and the concrete remained elastic. During tension, the reinforcing steel remained elastic, but the concrete elastic limit was exceeded in two areas, the center spans of the ceiling and the north wall, where elastic safety factors as low as 0.66 were obtained, thus indicating that the concrete would be expected to crack in those areas. Indeed, visual post-test inspection of those areas revealed tight cracks in the concrete.

  13. The new RENAULT TCe 130 1.4 I turbocharged gasoline engine

    Energy Technology Data Exchange (ETDEWEB)

    Boccadoro, Yves; Tranchant, Olivier; Pionnier, Robert; Engelhardt, Helmut [Renault s.a.s., Rueil-Malmaison (France). Powertrain Div.

    2009-07-01

    Committed to remain amongst the best car manufacturers in term of CO{sub 2} emissions, RENAULT is pursuing the development of an affordable ''downsized'' engine line-up referred to as TCe engines, initiated two years ago with TCe 100 1.2 I turbocharged gasoline engine. This paper describes the development of TCe 130 1.4 I turbocharged engine meant to replace the existing 2.0 I naturally aspirated engine thus significantly reducing CO{sub 2} emissions in the 130 HP range. Like other engines in the TCe family, TCe 130 offers optimum cost to value, combining fuel economy with performance and liveliness. The engine has a maximum torque of 190 Nm rate at 2250 rpm with maximum power of 96 kW rate at 5500 rpm. Low rpm torque and particularly low end torque were given special attention in order to have very pleasing acceleration capabilities. Compared to a similar 2.0 I naturally aspirated engine on the existing Megane (C segment), fuel economy of new Megane III is improved by about 20% on NEDC cycle. The engine derives from NISSAN's 1.6 I naturally aspirated engine which shows reduced weight and total cost of ownership, it has an aluminium block with cast iron inserted cylinder liners. Other design features include a forged crankshaft with 8 counterweights, a variable valve timing system on the inlet camshaft and a timing chain. The engine has been co-developed by RENAULT and NISSAN Engineering Teams. (orig.)

  14. Sorption, mobility, and fate of 1,4,7,8-tetrachlorodibenzo-p-dioxin in soils

    Energy Technology Data Exchange (ETDEWEB)

    Larsen, G.; Hakk, H. [USDA ARS Biosciences Research Lab., Fargo (United States); Fan, Z.; Casey, F. [North Dakota State Univ., Fargo (United States)

    2004-09-15

    Most dioxins are released into the environment through low temperature combustion processes, which include waste incineration and metal refining. Incineration of medical and municipal wastes in the early 1990s was estimated to generate 0.7g -5 kg dioxin Toxic Equivalents (TEQ)/yr and 2-3 kg TEQ/yr of polychlorinated dibenzo-p-dioxins (PCDDs)/polychlorinated dibenzofurans (PCDFs) emissions, respectively. Governmental regulatory controls on waste incinerators have resulted in an annual decrease of dioxins/furans emissions from 13.5 kg TEQ/yr to 2.8 kg TEQ/yr from 1987 to 1995. Recently backyard burning of household waste has been shown to produce more PCDDs/PCDFs per mass burned than a typical modern municipal waste incinerator and has been estimated to account for 22% of the dioxin emissions in North America from 1996-1997. These combustion processes result in direct deposition of dioxins on soil. While degradation studies of PCDDs/PCDFs have been conducted on contaminated soils, little is known about the sorption, transport, and fate of dioxins in various soil types. 1,4,7,8- Tetrachlorodibenzo-p-dioxin (1478-TCDD) was also found to be a significant congener of the dioxins in ball clay.7 Ball clay had been used as an anti-caking agent in soybean meal of animal feed but its use has subsequently been discontinued. The main goal of this study was to identify the fate and transport of 1478-TCDD in various soils and sand through the use of laboratory batch and soil column experiments.

  15. Inositol-1,4,5-trisphosphate receptor regulates hepatic gluconeogenesis in fasting and diabetes.

    Science.gov (United States)

    Wang, Yiguo; Li, Gang; Goode, Jason; Paz, Jose C; Ouyang, Kunfu; Screaton, Robert; Fischer, Wolfgang H; Chen, Ju; Tabas, Ira; Montminy, Marc

    2012-04-08

    In the fasted state, increases in circulating glucagon promote hepatic glucose production through induction of the gluconeogenic program. Triggering of the cyclic AMP pathway increases gluconeogenic gene expression via the de-phosphorylation of the CREB co-activator CRTC2 (ref. 1). Glucagon promotes CRTC2 dephosphorylation in part through the protein kinase A (PKA)-mediated inhibition of the CRTC2 kinase SIK2. A number of Ser/Thr phosphatases seem to be capable of dephosphorylating CRTC2 (refs 2, 3), but the mechanisms by which hormonal cues regulate these enzymes remain unclear. Here we show in mice that glucagon stimulates CRTC2 dephosphorylation in hepatocytes by mobilizing intracellular calcium stores and activating the calcium/calmodulin-dependent Ser/Thr-phosphatase calcineurin (also known as PP3CA). Glucagon increased cytosolic calcium concentration through the PKA-mediated phosphorylation of inositol-1,4,5-trisphosphate receptors (InsP(3)Rs), which associate with CRTC2. After their activation, InsP(3)Rs enhanced gluconeogenic gene expression by promoting the calcineurin-mediated dephosphorylation of CRTC2. During feeding, increases in insulin signalling reduced CRTC2 activity via the AKT-mediated inactivation of InsP(3)Rs. InsP(3)R activity was increased in diabetes, leading to upregulation of the gluconeogenic program. As hepatic downregulation of InsP(3)Rs and calcineurin improved circulating glucose levels in insulin resistance, these results demonstrate how interactions between cAMP and calcium pathways at the level of the InsP(3)R modulate hepatic glucose production under fasting conditions and in diabetes.

  16. Staged membrane oxidation reactor system

    Science.gov (United States)

    Repasky, John Michael; Carolan, Michael Francis; Stein, VanEric Edward; Chen, Christopher Ming-Poh

    2013-04-16

    Ion transport membrane oxidation system comprising (a) two or more membrane oxidation stages, each stage comprising a reactant zone, an oxidant zone, one or more ion transport membranes separating the reactant zone from the oxidant zone, a reactant gas inlet region, a reactant gas outlet region, an oxidant gas inlet region, and an oxidant gas outlet region; (b) an interstage reactant gas flow path disposed between each pair of membrane oxidation stages and adapted to place the reactant gas outlet region of a first stage of the pair in flow communication with the reactant gas inlet region of a second stage of the pair; and (c) one or more reactant interstage feed gas lines, each line being in flow communication with any interstage reactant gas flow path or with the reactant zone of any membrane oxidation stage receiving interstage reactant gas.

  17. Staged Repository Development Programmes

    Energy Technology Data Exchange (ETDEWEB)

    Isaacs, T

    2003-10-01

    Programs to manage and ultimately dispose of high-level radioactive wastes are unique from scientific and technological as well as socio-political aspects. From a scientific and technological perspective, high-level radioactive wastes remain potentially hazardous for geological time periods-many millennia-and scientific and technological programs must be put in place that result in a system that provides high confidence that the wastes will be isolated from the accessible environment for these many thousands of years. Of course, ''proof'' in the classical sense is not possible at the outset, since the performance of the system can only be known with assurance, if ever, after the waste has been emplaced for those geological time periods. Adding to this challenge, many uncertainties exist in both the natural and engineered systems that are intended to isolate the wastes, and some of the uncertainties will remain regardless of the time and expense in attempting to characterize the system and assess its performance. What was perhaps underappreciated in the early days of waste management and repository program development were the unique and intense reactions that the institutional, political, and public bodies would have to repository program development, particularly in programs attempting to identify and then select sites for characterization, design, licensing, and ultimate development. Reactions in most nations were strong, focused, unrelenting, and often successful in hindering, derailing, and even stopping national repository programs. The reasons for such reactions and the measures to successfully respond to them are still evolving and continue to be the focus of many national program and political leaders. Adaptive Staging suggests an approach to repository program development that reflects the unique challenges associated with the disposal of high-level radioactive waste. The step-wise, incremental, learn-as-you-go approach is intended to

  18. 76 FR 54225 - Draft Toxicological Review of 1,4-Dioxane: In Support of Summary Information on the Integrated...

    Science.gov (United States)

    2011-08-31

    ... phone: 703-750-3000, ext. 6727, or toll free at 1-800-2-VERSAR (ask for Betzy Colon, the 1,4-Dioxane... noncancer health effects and cancer assessments. Combined with specific exposure information, government...

  19. Synthesis of 2-methoxy-6-oxo-1, 4, 2-diazaphosphorinane-2-oxide, A New Potential Antitumor Phosphorus Heterocycle Compound

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    2-methoxy-6-oxo-1, 4, 2-diazaphosphorinane-2-oxide 8, phosphorus counterpart of 2, 6-dioxopiperazine, was synthesized as antitumor agent. The new phosphorus heterocycle compound 8 is the key intermediate in the synthesis of phosphorus counterpart of bisdioxopiperazine.

  20. Quantitative Structure-Activity Relationship Studies of 4-Imidazolyl- 1,4-dihydropyridines as Calcium Channel Blockers

    Directory of Open Access Journals (Sweden)

    Farzin Hadizadeh

    2013-08-01

    Conclusion: The predictive ability of the model was found to be satisfactory and could be used for designing a similar group of 1,4- dihydropyridines , based on a pyridine structure core which can block calcium channels.

  1. Neutraalne kaasabi ja kaasaaitamise ebaõigussisu. Riigikohtu kriminaalkolleegiumi otsus 3-1-1-4-12 / Jaan Sootak

    Index Scriptorium Estoniae

    Sootak, Jaan, 1948-

    2012-01-01

    Riigikohtu otsusest 3-1-1-4-12, mis selgitab, et mitte igasugune objektiivselt põhitegu soodustav ja subjektiivselt tahtlikult toime pandud tegu ei ole kaasaaitamine. Ründamise teooriast, riskiteooriast ning deliktilise olemusseose ja professionaalse adekvaatsuse teooriatest

  2. Synthesis of 1, 4-Dihydropyridine Derivatives using FeCl3 as Catalyst under Solvent-free Condition

    Directory of Open Access Journals (Sweden)

    ABDORRAHMAN KEYHANI

    2013-06-01

    Full Text Available A mixture of ethyl acetoacetate, benzaldehyde and ammonium acetate and in the presence of FeCl3 under solvent-free condition were converted to 1, 4-dihydropyridines with good yields.

  3. Stage-specific psychological determinants of stage transition

    NARCIS (Netherlands)

    Dijkstra, A.; Tromp, D; Conijn, B

    2003-01-01

    Objectives. The stages of change construct refers to the different psychological states people move through when they change their behaviour. However, the prediction that people in different stages of change need different sorts of interventions to stimulate the change process has scarcely been test

  4. Carboplatin and Paclitaxel With or Without Cisplatin and Radiation Therapy in Treating Patients With Stage I, Stage II, Stage III, or Stage IVA Endometrial Cancer

    Science.gov (United States)

    2016-02-09

    Endometrial Clear Cell Adenocarcinoma; Endometrial Serous Adenocarcinoma; Stage IA Uterine Corpus Cancer; Stage IB Uterine Corpus Cancer; Stage II Uterine Corpus Cancer; Stage IIIA Uterine Corpus Cancer; Stage IIIB Uterine Corpus Cancer; Stage IIIC Uterine Corpus Cancer; Stage IVA Uterine Corpus Cancer

  5. Synthesis of 2,3-diyne-1,4-naphthoquinone derivatives and evaluation of cytotoxic activity against tumor cell lines

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Mauro G.; Camara, Celso A.; Silva, Tania M.S., E-mail: ccelso@dcm.ufrpe.br [Universidade Federal Rural de Pernambuco (LSCB/UFRPE), Recife, PE (Brazil). Dept. de Ciencias Moleculares. Lab. de Sintese de Compostos Bioativos; Feitosa, Anderson C.S.; Meira, Assuero S.; Pessoa, Claudia [Universidade Federal do Ceara (LOE/UFC), Fortaleza, CE (Brazil). Dept. de Fisiologia e Farmacologia. Lab. de Oncologia Experimental

    2013-09-15

    A series of 2,3-diyne-1,4-naphthoquinone derivatives was synthesized from 2,3-dibromo- 1,4-naphthoquinone and various functionalized terminal alkynes using palladium-catalyzed Sonogashira cross-coupling reaction. The diynes were evaluated as potential cytotoxic agents against three tumor cell lines: human ovarian adenocarcinoma (OVCAR-8), human metastatic prostate cancer (PC-3M) and human bronchoalveolar lung carcinoma (NCI-H358M), presenting, in general, satisfactory results for inhibition of cell growth. (author)

  6. Synthesis of substituted 1,4-diazepines and 1,5-benzodiazepines using an efficient heteropolyacid-catalyzed procedure.

    Science.gov (United States)

    Kaoua, Rachedine; Bennamane, Norah; Bakhta, Saliha; Benadji, Sihame; Rabia, Cherifa; Nedjar-Kolli, Bellara

    2010-12-28

    An efficient and improved procedure for the synthesis of 1,4-diazepine and 1,5-benzodiazepine derivatives via the reaction of ketimine intermediates with aldehydes in the presence of Keggin-type heteropolyacids (HPAs) was developed. High yields and short reaction times were obtained for both electron-releasing and electron-withdrawing substituted 1,4-diazepine  and 1,5-benzodiazepines derivatives.

  7. Epoxidation and oxidation reactions using 1,4-butanediol dimethacrylate crosslinked polystyrene-supported tertiary butyl hydroperoxide

    Indian Academy of Sciences (India)

    M S Sheela; K Sreekumar

    2004-11-01

    1,4-Butanediol dimethacrylate (1,4-BDDMA) crosslinked polystyrene-supported -butyl hydroperoxide was employed in the epoxidation of olefins and oxidation of alcohols to carbonyl compounds. The reagent proved to be successful as a recyclable solid phase organic reagent with as much or more efficiency when compared to its monomeric counterpart. The extent of reaction was found to be dependent on various reaction parameters like solvent, temperature, molar concentration and presence of catalyst.

  8. Structure and Properties of Semiconductor Microclusters GanPn(n=1-4):A First Principle Study

    Institute of Scientific and Technical Information of China (English)

    ZHANG Cai-rong; CHEN Hong-shan; WANG Guang-hou

    2004-01-01

    The possible geometrical structures and relative stabilities of semiconductor microclusters GanPn(n= 1-4) were studied by virtue of density functional calculations with generalized gradient approximation (B3LYP).For the most stable isomers of GanPn(n= 1-4) clusters, the electronic structure, vibrational properties,dipole moment, polarizability and ionization potential were analyzed by means of HF, MP2, CISD and B3LYP methods with different basis sets.

  9. Preparation of a polyclonal antibody that recognizes a unique galactoseβ1-4fucose disaccharide epitope.

    Science.gov (United States)

    Takeuchi, Tomoharu; Nishiyama, Kazusa; Saito, Saori; Tamura, Mayumi; Fuwa, Takashi J; Nishihara, Shoko; Takahashi, Hideyo; Natsugari, Hideaki; Arata, Yoichiro; Kasai, Ken-ichi

    2015-08-14

    Galactoseβ1-4fucose (Galβ1-4Fuc) is a unique disaccharide unit that has been found only in the N-glycans of protostomia. We demonstrated that this unit has a role as an endogenous ligand for Caenorhabditis elegans galectins. This unit is also recognized by fungal and mammalian galectins possibly as a non-self glycomarker. In order to clarify its biological function, we made a polyclonal antibody using (Galβ1-4Fuc)n-BSA as the antigen, which was prepared by crosslinking Galβ1-4Fuc-O-(CH2)2-SH and BSA. The binding specificity of the antibody was analyzed by frontal affinity chromatography, and it was confirmed that it recognizes naturally occurring N-glycans containing the Galβ1-4Fuc unit linked to the reducing-end GlcNAc via α1-6 linkage. By western blotting analysis, the antibody was also found to bind to (Galβ1-4Fuc)n-BSA but not to BSA or asialofetuin, which has N-glycan chains containing Galβ1-4GlcNAc. Western blotting experiments also revealed presence of stained proteins in crude extracts of C. elegans, the parasitic nematode Ascaris suum, and the allergenic mite Dermatophagoides pteronyssinus, while those from Drosophila melanogaster, Mus musculus, and the allergenic mites Dermatophagoides farinae and Tyrophagus putrescentiae were negative. This antibody should be a very useful tool for research on the distribution of the Galβ1-4Fuc disaccharide unit in glycans in a wide range of organisms.

  10. Characterizing the intrinsic bioremediation potential of 1,4-dioxane and trichloroethene using innovative environmental diagnostic tools.

    Science.gov (United States)

    Chiang, Sheau-Yun Dora; Mora, Rebecca; Diguiseppi, William H; Davis, Greg; Sublette, Kerry; Gedalanga, Phillip; Mahendra, Shaily

    2012-09-01

    An intrinsic biodegradation study involving the design and implementation of innovative environmental diagnostic tools was conducted to evaluate whether monitored natural attenuation (MNA) could be considered as part of the remedial strategy to treat an aerobic aquifer contaminated with 1,4-dioxane and trichloroethene (TCE). In this study, advanced molecular biological and stable isotopic tools were applied to confirm in situ intrinsic biodegradation of 1,4-dioxane and TCE. Analyses of Bio-Trap® samplers and groundwater samples collected from monitoring wells verified the abundance of bacteria and enzymes capable of aerobically degrading TCE and 1,4-dioxane. Furthermore, phospholipid fatty acid analysis with stable isotope probes (PLFA-SIP) of the microbial community validated the ability for microbial degradation of TCE and 1,4-dioxane. Compound specific isotope analysis (CSIA) of groundwater samples for TCE resulted in δ(13)C values that indicated likely biodegradation of TCE in three of the four monitoring wells sampled. Results of the MNA evaluation showed that enzymes capable of aerobically degrading TCE and 1,4-dioxane were present, abundant, and active in the aquifer. Taken together, these results provide direct evidence of the occurrence of TCE and 1,4-dioxane biodegradation at the study site, supporting the selection of MNA as part of the final remedy at some point in the future.

  11. [Phenotypic and molecular characteristics of Salmonella enterica serotype 1,4, [5] ,12:i:--a review].

    Science.gov (United States)

    Yang, Xiaojuan; Wu, Qingping; Zhang, Jumei; Guo, Weipeng

    2014-11-01

    Salmonella enterica serotype 1, 4, [5 ], 12: i:- ( Salmonella 1, 4, [5], 12: i:-), an emerging serotype antigenically related to Salmonella Typhimurium (1,4, [5], 12 : i:1,2) but lacking the second phase flagellar antigen, has been frequently detected in many countries over the last 10 years. Nowadays it seems to be one of the major serotypes responsible for human salmonellosis cases worldwide. In addition, multidrug resistance is quite common in Salmonella 1, 4, [5],12:i:-, the two major clones (labelled as Spanish and European clones) show multidrug resistance to four or more unrelated classes of antimicrobials mediated by plasmids or chromosome. Some resistance determinants including bla(TEM), bla(CTX-M(-1), aac(3)-IV, aadA2, cmlA1, sul1, sul2, dfrA12, strA-strB, tet (A) and tet (B) have been found in these multidrug resistance strains. The genomic characterization of 1,4, [5] ,12:i:- isolates suggests that this serovar is likely to gather several clones or strains that have independently emerged from S. Typhimurium, and have changed through multiple independent events involving different clonal groups. In later study, emphasis should be paid on development of rapid and precise detection methods and study of pathogenic and resistance mechanisms of Salmonella 1,4, [5] ,12:i:-.

  12. Quantum cascade lasers operating from 1.4 to 4 THz

    Institute of Scientific and Technical Information of China (English)

    Sushil Kumar

    2011-01-01

    The development of teranertz (THz) quantum cascade lasers (QCLs) has progressed considerably since their advent almost a decade ago. THz QCLs operating in a frequency range from 1.4 to 4 THz with electron-phonon scattering mediated depopulation schemes are described. Several different types of GaAs/AlGaAs superlattice designs are reviewed. Some of the best temperature performances are obtained by the so-called resonant-phonon designs that are described. Operation above a temperature of 160 K has been obtained across the spectrum for THz QCLs operating at v > 1.8 THz. The maximum operating temperature of previously reported THz QCLs has empirically been limited to a value of ~ hω/kB- A new design scheme for THz QCLs with scattering-assisted injection is shown to surpass this empirical temperature barrier, and is promising to improve the maximum operating temperatures of THz QCLs even further.%1.IntroductionHigh-power sources of terahertz (THz) radiation are required for a multitude of applications in sensing,imaging,and spectroscopy in fields as diverse as astronomy,medicine,security,pharmaceuticals and so-forth.THz science and technology has advanced significantly in the recent years[1,2] especially toward the realization of novel THz radiation sources.In comparison to narrow-band sources such as lasers,broadband sources of terahertz radiation are more widely available;however,such sources are inherently low power (average power is of the order of few micro-Watts).They are useful nevertheless because of room temperature operation and for their ability to be detected coherently.Techniques such as generation of THz bandwidth time-domain pulses in high resistivity semiconductors[3],non-linear generation by electrooptical-rectification in crystals such as ZnTe[4],or nonlinear generation by optical parametric conversion in materials such as LiNbO3[5] or by difference-frequency generation in semiconductors[6],have been used for various raster-scanned imaging and

  13. Development of quinoxaline 1, 4-dioxides resistance in Escherichia coli and molecular change under resistance selection.

    Directory of Open Access Journals (Sweden)

    Wentao Guo

    Full Text Available Quinoxaline 1, 4-dioxides (QdNOs has been used in animals as antimicrobial agents and growth promoters for decades. However, the resistance to QdNOs in pathogenic bacteria raises worldwide concern but it is barely known. To explore the molecular mechanism involved in development of QdNOs resistance in Escherichia coli, 6 strains selected by QdNOs in vitro and 21 strains isolated from QdNOs-used swine farm were subjected to MIC determination and PCR amplification of oqxA gene. A conjugative transfer was carried out to evaluate the transfer risk of QdNOs resistant determinant. Furthermore, the transcriptional profile of a QdNOs-resistant E. coli (79O4-2 selected in vitro with its parent strain 79-161 was assayed with a prokaryotic suppression subtractive hybridization (SSH PCR cDNA subtraction. The result showed that more than 95% (20/21 clinical isolates were oqxA positive, while all the 6 induced QdNOs-resistant strains carried no oqxA gene and exhibited low frequency of conjugation. 44 fragments were identified by SSH PCR subtraction in the QdNOs-resistant strain 79O4-2. 18 cDNAs were involved in biosynthesis of Fe-S cluster (narH, protein (rpoA, trmD, truA, glyS, ileS, rplFCX, rpsH, fusA, lipoate (lipA, lipid A (lpxC, trehalose (otsA, CTP(pyrG and others molecular. The 11 cDNAs were related to metabolism or degradation of glycolysis (gpmA and pgi and proteins (clpX, clpA, pepN and fkpB. The atpADG and ubiB genes were associated with ATP biosynthesis and electron transport chain. The pathway of the functional genes revealed that E. coli may adapt the stress generated by QdNOs or develop specific QdNOs-resistance by activation of antioxidative agents biosynthesis (lipoate and trehalose, protein biosynthesis, glycolysis and oxidative phosphorylation. This study initially reveals the possible molecular mechanism involved in the development of QdNOs-resistance in E. coli, providing with novel insights in prediction and assessment of the emergency

  14. Structural Snapshots of Beta- 1,4Galactosyltransferase-l Along the Kinetic Pathway

    Energy Technology Data Exchange (ETDEWEB)

    Ramakrishnan,B.; Ramasamy, V.; Qasba, P.

    2006-01-01

    During the catalytic cycle of {beta}1,4-galactosyltransferase-1 (Gal-T1), upon the binding of Mn{sup 2+} followed by UDP-Gal, two flexible loops, a long and a short loop, change their conformation from open to closed. We have determined the crystal structures of a human M340H-Gal-T1 mutant in the open conformation (apo-enzyme), its Mn{sup 2+} and Mn{sup 2+}-UDP-Gal-bound complexes, and of a pentenary complex of bovine Gal-T1-Mn{sup 2+}-UDP-GalNAc-Glc-{alpha}-lactalbumin. These studies show that during the conformational changes in Gal-T1, the coordination of Mn{sup 2+} undergoes significant changes. It loses a coordination bond with a water molecule bound in the open conformation of Gal-T1 while forming a new coordination bond with another water molecule in the closed conformation, creating an active ground-state structure that facilitates enzyme catalysis. In the crystal structure of the pentenary complex, the N-acetylglucosamine (GlcNAc) moiety is found cleaved from UDP-GalNAc and is placed 2.7 {angstrom} away from the O4 oxygen atom of the acceptor Glc molecule, yet to form the product. The anomeric C1 atom of the cleaved GalNAc moiety has only two covalent bonds with its non-hydrogen atoms (O5 and C2 atoms), similar to either an oxocarbenium ion or N-acetylgalactal form, which are crystallographically indistinguishable at the present resolution. The structure also shows that the newly formed, metal-coordinating water molecule forms a hydrogen bond with the {beta}-phosphate group of the cleaved UDP moiety. This hydrogen bond formation results in the rotation of the {beta}-phosphate group of UDP away from the cleaved GalNAc moiety, thereby preventing the re-formation of the UDP-sugar during catalysis. Therefore, this water molecule plays an important role during catalysis in ensuring that the catalytic reaction proceeds in a forward direction.

  15. Deep Near-infrared Spectroscopy of Passively Evolving Galaxies at z >~ 1.4

    Science.gov (United States)

    Onodera, M.; Renzini, A.; Carollo, M.; Cappellari, M.; Mancini, C.; Strazzullo, V.; Daddi, E.; Arimoto, N.; Gobat, R.; Yamada, Y.; McCracken, H. J.; Ilbert, O.; Capak, P.; Cimatti, A.; Giavalisco, M.; Koekemoer, A. M.; Kong, X.; Lilly, S.; Motohara, K.; Ohta, K.; Sanders, D. B.; Scoville, N.; Tamura, N.; Taniguchi, Y.

    2012-08-01

    We present the results of new near-IR spectroscopic observations of passive galaxies at z >~ 1.4 in a concentration of BzK-selected galaxies in the COSMOS field. The observations have been conducted with Subaru/MOIRCS, and have resulted in absorption lines and/or continuum detection for 18 out of 34 objects. This allows us to measure spectroscopic redshifts for a sample that is almost complete to K AB = 21. COSMOS photometric redshifts are found in fair agreement overall with the spectroscopic redshifts, with a standard deviation of ~0.05; however, ~30% of objects have photometric redshifts systematically underestimated by up to ~25%. We show that these systematic offsets in photometric redshifts can be removed by using these objects as a training set. All galaxies fall in four distinct redshift spikes at z = 1.43, 1.53, 1.67, and 1.82, with this latter one including seven galaxies. SED fits to broadband fluxes indicate stellar masses in the range of ~4-40 × 1010 M ⊙ and that star formation was quenched ~1 Gyr before the cosmic epoch at which they are observed. The spectra of several individual galaxies have allowed us to measure their HδF indices and the strengths of the 4000 Å break, which confirms their identification as passive galaxies, as does a composite spectrum resulting from the co-addition of 17 individual spectra. The effective radii of the galaxies have been measured on the COSMOS HST/ACS i F814W-band image, confirming the coexistence at these redshifts of passive galaxies, which are substantially more compact than their local counterparts with others that follow the local effective radius-stellar mass relation. For the galaxy with the best signal-to-noise spectrum we were able to measure a velocity dispersion of 270 ± 105 km s-1 (error bar including systematic errors), indicating that this galaxy lies closely on the virial relation given its stellar mass and effective radius. Based on data collected at the Subaru telescope, which is operated by

  16. Probing Interstellar Silicate Dust Grain Properties in Quasar Absorption Systems at Redshifts z<1.4

    Science.gov (United States)

    Aller, M.; Kulkarni, V. P.; York, D. G.; Welty, D. E.; Vladilo, G.; Som, D.

    Absorption lines in the spectra of distant quasars whose sightlines serendipitously pass through foreground galaxies provide a valuable tool to simultaneously probe the dust and gas compositions of the interstellar medium (ISM) in galaxies. In particular, the damped and sub-damped Lyman- α (DLA/sub-DLA) absorbers trace gas-rich galaxies, independent of the intrinsic luminosities or star-formation rates of the associated galaxy stellar populations. The first evidence of silicate dust in a quasar absorption system was provided through our detection of the 10 µ m silicate feature in the z=0.52 DLA absorber toward the quasar AO 0235+164. We present results from 2 follow-up programs using archival Spitzer Space Telescope infrared spectra to study the interstellar silicate dust grain properties in a total of 13 quasar absorption systems at 0.1 < z < 1.4. We find clear detections of the 10 µ m silicate feature in the quasar absorption systems studied. In addition, we also detect the 18 µ m silicate feature in the sources with adequate spectral coverage. We find variations in the breadth, peak wavelength, and substructure of the 10 µ m interstellar silicate absorption features among the absorbers. This suggests that the silicate dust grain properties in these distant galaxies may differ relative to one another, and relative to those in the Milky Way. We also find suggestions in several sources, based on comparisons with laboratory-derived profiles from the literature, that the silicate dust grains may be significantly more crystalline than those in the amorphous Milky Way ISM. This is particularly evident in the z=0.89 absorber toward the quasar PKS 1830-211, where substructure near 10 µ m is consistent with a crystalline olivine composition. If confirmed, these grain property variations may have implications for both dust and galaxy evolution over the past 9 Gyrs, and for the commonly-made assumption that highredshift dust is similar to local dust. We also discuss

  17. Clinical impact of PAI 1 4G/5G gene polymorphism in colorectal carcinoma patients.

    Science.gov (United States)

    Halamkova, J; Kiss, I; Pavlovsky, Z; Tomasek, J; Jarkovsky, J; Cech, Z; Bednarova, D; Tucek, S; Hanakova, L; Moulis, M; Zavrelova, J; Man, M; Benda, P; Robek, O; Kala, Z; Penka, M

    2013-01-01

    Plasminogen activator ihnibitor (PAI 1) belongs to the plasminogen activator system, which is part of the metastatic cascade and significantly contributes to invasive growth and angiogenesis of malignant tumors. Its plasma level is normally low but 4G/4G homozygotes have higher concentrations of PAI 1. This genotype may be associated with worse prognosis and proximal location of colorectal cancer than 5G/5G homozygotes. In our prospective evaluation we examined plasma level PAI 1 (using photometric microplate method ELISA) pre-surgery and, subsequently, 6-8 weeks later, from 80 patients. For the PAI 1 rs1799889 -675 4G/5G polymorphism test the PCR amplification was used.Analysis of collected data was confirmed that significantly higher plasma levels of PAI 1 were found in patients before starting therapy, which decreased (p=0.004) after initiation of treatment. Patients with higher plasma level PAI 1 before (p=0.013) and after therapy (p=0.004) had significantly shorter survival. We found no relationship between polymorphisms of PAI 1 (-675 4G/5G) in relation to stage, survival or tumor location. PAI 1 is useful as a negative marker of prognosis and could be advantageous when planning adjuvant treatment of patients with colorectal carcinoma. Although opinions on the importance of polymorphisms of PAI 1 in relation to the prognosis are not uniform, it does seem that their role in the prognosis of patients with colorectal cancer is not essential.

  18. ESR, electrochemical, molecular modeling and biological evaluation of 4-substituted and 1,4-disubstituted 7-nitroquinoxalin-2-ones as potential anti- Trypanosoma cruzi agents

    Science.gov (United States)

    Aguilera-Venegas, Benjamín; Olea-Azar, Claudio; Norambuena, Ester; Arán, Vicente J.; Mendizábal, Fernando; Lapier, Michel; Maya, Juan Diego; Kemmerling, Ulrike; López-Muñoz, Rodrigo

    2011-03-01

    Electrochemical and ESR studies were carried out in this work with the aim of characterizing the reduction mechanisms of 4-substituted and 1,4-disubstituted 7-nitroquinoxalin-2-ones by means of cyclic voltammetry in DMSO as aprotic solvent. Two reduction mechanisms were found for these compounds: the first, for compounds bearing a labile hydrogen by following a self-protonation mechanism (ECE steps), and the second, for compounds without labile hydrogen, based on a purely electrochemical reduction mechanism (typical of nitroheterocycles). The electrochemical results were corroborated using ESR spectroscopy allowing us to propose the hyperfine splitting pattern of the nitro-radical, which was later corroborated by the ESR simulation spectra. All these compounds were assayed as growth inhibitors against Trypanosoma cruzi: first, on the non-proliferative (and infective) form of the parasite (trypomastigote stage), and then, the ones that displayed activity, were assayed on the non-infective form (epimastigote stage). Thus, we found four new compounds highly active against T. cruzi. Finally, molecular modeling studies suggest the inhibition of the trypanothione reductase like one of the possible mechanisms involved in the trypanocidal action.

  19. Lernpunkt Deutsch--Stage 1.

    Science.gov (United States)

    Theil, Elvira

    1997-01-01

    Evaluates the first stage of "Lernpunkt Deutsch," a new three-stage German course designed for upper elementary and early secondary school. Describes the publisher's package of materials and the appropriateness of the course, utility of the different package elements, format of the materials, and assesses whether the course provides pedagogically…

  20. Writing Stages: A Developmental Hierarchy.

    Science.gov (United States)

    Milner, Joseph O.

    The developmental stages of writing can be related to Jean Piaget's final three stages of development (preoperational, concrete operational, and formal operational) and to the narrative, descriptive, explanative, analytical, and artistic rhetorical modes. As the child enters kindergarten or the first grade, narrative blooms. By this age most young…

  1. SUBCELLULAR LOCALIZATIONS OF β-1,4-GALACTOSYLTRANSFERASE- Ⅱ AND Ⅴ%β-1,4-半乳糖基转移酶Ⅱ、Ⅴ表达的亚细胞结构定位研究

    Institute of Scientific and Technical Information of China (English)

    沈爱国; 何江虹; 丁斐; 朱敏; 王汉洲; 顾建新

    2003-01-01

    为了研究β-1,4-半乳糖基转移酶Ⅱ和Ⅴ(β-1,4-GalT-Ⅲ and Ⅴ)蛋白表达的亚细胞结构定位,本实验构建了β-1,4-GalT-Ⅱ和Ⅴ融合绿色荧光蛋白(GFP)表达质粒,分别将构建的质粒转染到PC12细胞和肝癌7721细胞中,在荧光显微镜下观察β-1,4-GalT-Ⅱ和Ⅴ在其中表达的亚细胞结构定位.发现,β-1,4-GalT-Ⅱ和Ⅴ主要表达在这两种细胞的细胞核旁的Golgi复合体,说明它们主要分布在Golgi复合体上.提示它们可能是在Golgi复合体参与蛋白质的糖链修饰.

  2. Gamma-Hydroxybutyrate (GHB), gamma-butyrolactone (GBL), and 1,4-butanediol (1,4-BD) reduce the volume of cerebral infarction in rodent transient middle cerebral artery occlusion.

    Science.gov (United States)

    Sadasivan, Shankar; Maher, Timothy J; Quang, Lawrence S

    2006-08-01

    gamma-Hydroxybutyric acid (GHB), an endogenous organic acid catabolite of gamma-aminobutyric acid (GABA), has been shown to have tissue-protective effects in various organs, including the brain. We examined the potential neuroprotective effect of GHB and its chemical precursors, gamma-butyrolactone (GBL) and 1,4-butanediol (1,4-BD), in the rodent ischemic stroke model by intraluminal filament middle cerebral artery occlusion (MCAO). Adult male Sprague-Dawley rats underwent transient left-sided MCAO and received intraperitoneal treatment with 300 mg/kg of GHB, GBL, 1,4-BD, or control vehicle given at 30 min before, as well as 180 and 360 min after the onset of ischemia. Infarct volumes were determined 24 h after MCAO. In transient MCAO, the mean volume of infarction for control rats was 464.4 +/- 17.9 cu.mm versus 273.6 +/- 53.1, 233.3 +/- 44.7, and 275.4 +/- 39.9 cu.mm for rats treated with 1,4-BD (P GBL (P GBL, and 1,4-BD protect against rat focal cerebral ischemia from transient MCAO.

  3. 1,4-苯并二(口恶)烷类新木脂素Eusiderin G的全合成%A Facile Total Synthesis of 1,4-Benzodioxane Type Neolignans, Eusiderin G

    Institute of Scientific and Technical Information of China (English)

    汪秋安; 孙朝旭; 陈清奇

    2000-01-01

    An efficient transformation of methyl gallate to Eusiderin G7, a neolignan with 1,4-benzodioxane nuclei,in six steps with 24% overall yield is reported.This route is distinctly shorter,more economic and efficient than any of the previous approaches to the target reported in the literature.The Key step is a cyclization of an dihydroxy intermediate 4 catalysted by a strong acid ion exchange resin to give 1,4-benzodioxane skeleton.%以没食子酸甲酯为原料,经过6步反应(总产率为24%),对1,4-苯并二噁烷类新木脂素天然产物Eusidrin G进行了全合成.合成反应的关键步骤是在强酸性离子交换树脂催化下,分子内的醇羟基与酚羟基之间发生脱水反应,关环形成1,4-苯并二噁烷骨架化合物.该合成路线具有简便易行、产率较高、副反应少的特点,可适用于其它具有生理活性的1,4-苯二噁烷类化合物的合成.

  4. Synthesis and Structure of a Novel Supramolecular Compound [Co(2,2'-bipy)(H2 O)4 ][trans-1,4-chdc] and Separation of Isomer of 1,4-Cyclohexanedicarboxylic Acid

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    A supramolecular compound, [Co(2,2'-bipy)(H2O)4][trans-1,4-chdc] (compound 1) (2,2'-bipy=2,2'-bipyridine, 1,4-chdcH2=1,4-cyclohexanedicarboxylic acid), was synthesized and characterized by single-crystal X-ray diffraction analysis, IR spectrometry, TG analysis, and elemental analyses. Single-crystal X-ray diffraction analysis revealed that [Co(2,2'-bipy)(H2O)4]2+ units and adjacent 1,4-chdc2- formed a single layer by hydrogen bonding and electrostatic interactions along the ac-plane, and two symmetry-related single layers interacted with each other by hydrogen bonding, resulting in a double layer, which further formed a 3-D structure by π-π stacking. The most attractive structural feature of compound 1 is that 1,4-chdc2- possesses only trans-conformation although there are both cis- and trans-conformations in the raw material.

  5. Multi-stage complex contagions

    Science.gov (United States)

    Melnik, Sergey; Ward, Jonathan A.; Gleeson, James P.; Porter, Mason A.

    2013-03-01

    The spread of ideas across a social network can be studied using complex contagion models, in which agents are activated by contact with multiple activated neighbors. The investigation of complex contagions can provide crucial insights into social influence and behavior-adoption cascades on networks. In this paper, we introduce a model of a multi-stage complex contagion on networks. Agents at different stages—which could, for example, represent differing levels of support for a social movement or differing levels of commitment to a certain product or idea—exert different amounts of influence on their neighbors. We demonstrate that the presence of even one additional stage introduces novel dynamical behavior, including interplay between multiple cascades, which cannot occur in single-stage contagion models. We find that cascades—and hence collective action—can be driven not only by high-stage influencers but also by low-stage influencers.

  6. Isostatic compaction of beaker shaped bentonite blocks on the scale 1:4

    Energy Technology Data Exchange (ETDEWEB)

    Johannesson, Lars-Erik [Clay Technology AB, Lund (Sweden); Nord, Sven [Ifoe Ceramics AB, Bromoella (Sweden ); Pusch, Roland [Geodevelopment AB, Lund (Sweden); Sjoeblom, Rolf [AaF-Energikonsult AB, Stockholm (Sweden)

    2000-09-01

    The purpose of the present work is to test, on a scale of 1:4, the feasibility of manufacturing bentonite blocks by isostatic compaction for application as a buffer material in a repository for spent nuclear fuel. In order for the tests to be sensitive to any weaknesses of the method, the blocks were shaped as beakers. The scope included the following: 1. Preparation of powder: a. mixing of the bentonite and addition of water in predetermined amounts, b. sieving to remove any lumps generated; 2. Isostatic compaction: a. establishment of a separate laboratory for the handling of bentonite powder (weighing, mixing, filling, sampling and machining), b. development and design of equipment and procedures for compaction of bentonite to beaker-shaped specimens, c. compaction process operation, d. visual inspection; 3. Sampling and characterisation: a. extraction of samples from the blocks made, b. determination of water content, c. determination of density, d. determination of strain at maximum stress by means of bending tests, e. determination of tensile strength by means of bending tests, f. determination of geometries of the blocks prepared; 4. Post-treatment by means of machining: a. machining of blocks made, b. visual inspection; 5. Evaluation. The work went very smoothly. No significant obstacles or unexpected events were encountered. The conclusions are as follows: The conclusions drawn in this report from work on the (linear)scale of one to four are very relevant to the full scale. Mixing of bentonite powder as well as moistening can be carried out on a pilot scale with a good homogeneity and with maintained good quality of the press powder. The compaction of bentonite can be carried out in a similar manner to the present operation at Ifoe Ceramics AB. This implies a very efficient handling as well as a very efficient use of the time in the press which may account for a large proportion of the total cost. The blocks could readily be produced to reproducible

  7. Regulation of autophagy in cardiomyocytes by Ins(1,4,5)P(3) and IP(3)-receptors.

    Science.gov (United States)

    Wong, Albert; Grubb, David R; Cooley, Nicola; Luo, Jieting; Woodcock, Elizabeth A

    2013-01-01

    Autophagy is a process that removes damaged proteins and organelles and is of particular importance in terminally differentiated cells such as cardiomyocytes, where it has primarily a protective role. We investigated the involvement of inositol(1,4,5)trisphosphate (Ins(1,4,5)P(3)) and its receptors in autophagic responses in neonatal rat ventricular myocytes (NRVM). Treatment with the IP(3)-receptor (IP(3)-R) antagonist 2-aminoethoxydiphenyl borate (2-APB) at 5 or 20 μmol/L resulted in an increase in autophagosome content, defined as puncta labeled by antibody to microtubule associated light chain 3 (LC3). 2-APB also increased autophagic flux, indicated by heightened LC3II accumulation, which was further enhanced by bafilomycin (10nmol/L). Expression of Ins(1,4,5)P(3) 5-phosphatase (IP(3)-5-Pase) to deplete Ins(1,4,5)P(3) also increased LC3-labeled puncta and LC3II content, suggesting that Ins(1,4,5)P(3) inhibits autophagy. The IP(3)-R can act as an inhibitory scaffold sequestering the autophagic effector, beclin-1 to its ligand binding domain (LBD). Expression of GFP-IP(3)-R-LBD inhibited autophagic signaling and furthermore, beclin-1 co-immunoprecipitated with the IP(3)-R-LBD. A mutant GFP-IP(3)-R-LBD with reduced ability to bind Ins(1,4,5)P(3) bound beclin-1 and inhibited autophagy similarly to the wild type sequence. These data provide evidence that Ins(1,4,5)P(3) and IP(3)-R act as inhibitors of autophagic responses in cardiomyocytes. By suppressing autophagy, IP(3)-R may contribute to cardiac pathology.

  8. Synthesis of ionic liquid 1,4- (1-isopropyl-imidazole) butane bromide%离子液体1,4-二(1-异丙基咪唑)丁烷溴化物的合成研究

    Institute of Scientific and Technical Information of China (English)

    刘泓; 赵琦

    2011-01-01

    1-Isopropyl-imidazole was synthesized by reaction of isopropyl atnine with glyoxal, formaldehyde and ammonia in methanol. Bidentate ionic liquid 1,4-( 1-isopropyl-imidazole) butane bromide was synthesized by using 1-isopropyl-imidazole. The compound was confirmed by IR,'H NMR and 13C NMR.%以乙二醛、甲醛、氨水和异丙胺为原料,甲醇为溶剂,合成1-异丙基咪唑.由1-异丙基咪唑与1,4-二溴丁烷反应,合成一种二齿型离子液体1,4-二(1-异丙基眯唑)丁烷溴化物,产物经IR、1H NMR和13C NMR予以表征.

  9. Expresion of A-type potassium channel Kv1. 4 in the hippocampi regions of epilepsy model%A型钾通道Kv1.4在致痫大鼠海马区的表达

    Institute of Scientific and Technical Information of China (English)

    李亚伟; 曾常茜; 邹飒枫; 胡波; 李冬平

    2011-01-01

    Objective This article aimed to check the expression of A-type potassium channel Kv1.4 in the hippocampi CA1 ,CA3 and DG regions of epilepsy model-induced by pentylenetetrazol (PTZ) ,and discuss the relation of A-type potassium channel to epilepsy.Methods Forty SD rats were divided randomly into control group and epilepsy groups ( 1h,24h and 72h after injecting PTZ) ,each group had ten rats.The rats models of epilepsy were established by injecting PTZ.Kv.1 4 protein were deteced at different times in the CA1 ,CA3 and DG regions of hippocampus,by using immunohistoehemical assay and Western Blot.Results PTZ-induced epilepsy caused a obvious decline in Kv1.4 protein at 1h,24h and 72h time point( P <0.05 ); the expressions of Kv1.4 protein among the experimental groups were not obviously different( P >0.05).Conclusions A-type potassium channel Kv1.4 had a wide distributing in the hippocampus of SD rats,expressed abundantly and especially in neuraxon.The expression of A-type potassium channel Kv1.4 protein in hippocampus of epileptic model was descendant, and this result clewed that the downregulation may be associated with epilepsy.%目的 通过检测A型钾通道Kv1.4在戊四唑(PTZ)致痈大鼠海马CA1、CA3及齿状同区的表达变化,探讨A型钾通道与癫痫发病的关系.方法 SD大鼠40只,随机分为对照组、致痫后1h、24h、72h组,每组各10只.腹腔注射PTZ制备大鼠癫痫模型,应用免疫组化及Western Blot技术检测Kv1.4在各时间段海马CA1、CA3及齿状回区的蛋白表达.结果 致痫组大鼠海马区Kv1.4蛋白水平在致痫后1h、24h、72h 3个时间段均明显低于正常组(P0.05).结论 (1)A型钾通道Kv1.4在SD大鼠海马中广泛分布.表达丰富,以轴突处最为明显.(2)大鼠癫痫模型海马区A型钾通道Kv1.4蛋白表达减少,提示Kv1.4的表达下调可能与癫痫的发病相关.

  10. Thermodynamic and kinetic studies of the equilibration reaction between the sulfur and carbon bonded forms of a cobalt(III) complex with the ligands 1,4,7-triazycyclononane and 1,4-diaza-7-thiacyclodecane

    DEFF Research Database (Denmark)

    Song, Y.S.; Becker, J.; Kofod, Pauli

    1996-01-01

    -sulfur complex to form the alkyl complex gave 100% loss of deuterium. It is concluded that the labile methylene proton is bound to the carbon atom which in the alkyl complex is bound to cobalt(III). From the kinetic data it is estd. that the carbanion reacts with water 270 times faster than it is captured......The new cyclic thioether 1,4-diaza-7-thiacyclodecane, dathicd, has been synthesized and used for the prepn. of the sulfur- and carbon-bonded cobalt(III) complexes: [Co(tacn)(S-dathicd)]Cl3.5H2O and [Co(tacn)(C-dathicd)](ClO4)2 (tacn, 1,4,7-triazacyclononane; C-dathicd, 1,4-diamino-7-thiacyclodecan...

  11. Prevalence and Characterization of Monophasic Salmonella Serovar 1,4,[5],12:i:- of Food Origin in China.

    Directory of Open Access Journals (Sweden)

    Xiaojuan Yang

    Full Text Available Salmonella enterica subsp. enterica serovar 1,4,[5],12:i:- is a monophasic variant of Salmonella Typhimurium, which has recently been recognized as an emerging cause of infection worldwide. This bacterium has also ranked among the four most frequent serovars causing human salmonellosis in China. However, there are no reports on its contamination in Chinese food. Serotyping, polymerase chain reaction, antibiotic resistance, virulotyping, and multilocus sequence typing (MLST assays were used to investigate the prevalence of this serological variant in food products in China, and to determine phenotypic and genotypic difference of monophasic isolates and Salmonella Typhimurium isolated over the same period. Salmonella 1,4,[5],12:i:- was prevalent in various food sources, including beef, pork, chicken, and pigeon. The study also confirmed the high prevalence (53.8% of resistance to ampicillin, streptomycin, sulfonamides, and tetracycline in Salmonella 1,4,[5],12:i:-, which was higher than that in Salmonella Typhimurium. Moreover, Salmonella 1,4,[5],12:i:- isolates in our study were different from Salmonella Typhimurium isolates by the absence of three plasmid-borne genes (spvC, pefA, and rck and the presence of gipA in all isolates. All Salmonella 1,4,[5],12:i:- isolates demonstrated MLST pattern ST34. Genomic deletions within the fljBA operon and surrounding genes were only found in Salmonella 1,4,[5],12:i:- isolates, with all isolates containing a deletion of fljB. However, hin and iroB were identified in all Salmonella 1,4,[5],12:i:- isolates. Three different deletion profiles were observed and two of them were different from the reported Salmonella 1,4,[5],12:i:- clones from Spain, America, and Italy, which provided some new evidence on the independent evolution of the multiple successful monophasic clones from Salmonella Typhimurium ancestors. This study is the first report of Salmonella 1,4,[5],12:i:- in food products from China. The data are

  12. Ins(1,4,5)P3 receptor-mediated Ca2+ signaling and autophagy induction are interrelated.

    Science.gov (United States)

    Decuypere, Jean-Paul; Welkenhuyzen, Kirsten; Luyten, Tomas; Ponsaerts, Raf; Dewaele, Michael; Molgó, Jordi; Agostinis, Patrizia; Missiaen, Ludwig; De Smedt, Humbert; Parys, Jan B; Bultynck, Geert

    2011-12-01

    The role of intracellular Ca2+ signaling in starvation-induced autophagy remains unclear. Here, we examined Ca2+ dynamics during starvation-induced autophagy and the underlying molecular mechanisms. Tightly correlating with autophagy stimulation, we observed a remodeling of the Ca2+ signalosome. First, short periods of starvation (1 to 3 h) caused a prominent increase of the ER Ca2+-store content and enhanced agonist-induced Ca2+ release. The mechanism involved the upregulation of intralumenal ER Ca2+-binding proteins, calreticulin and Grp78/BiP, which increased the ER Ca2+-buffering capacity and reduced the ER Ca2+ leak. Second, starvation led to Ins(1,4,5)P3R sensitization. Immunoprecipitation experiments showed that during starvation Beclin 1, released from Bcl-2, first bound with increasing efficiency to Ins(1,4,5)P3Rs; after reaching a maximal binding after 3 h, binding, however, decreased again. The interaction site of Beclin 1 was determined to be present in the N-terminal Ins(1,4,5)P3-binding domain of the Ins(1,4,5)P3R. The starvation-induced Ins(1,4,5)P3R sensitization was abolished in cells treated with BECN1 siRNA, but not with ATG5 siRNA, pointing toward an essential role of Beclin 1 in this process. Moreover, recombinant Beclin 1 sensitized Ins(1,4,5)P3Rs in 45Ca2+-flux assays, indicating a direct regulation of Ins(1,4,5)P3R activity by Beclin 1. Finally, we found that Ins(1,4,5)P3R-mediated Ca2+ signaling was critical for starvation-induced autophagy stimulation, since the Ca2+ chelator BAPTA-AM as well as the Ins(1,4,5)P3R inhibitor xestospongin B abolished the increase in LC3 lipidation and GFP-LC3-puncta formation. Hence, our results indicate a tight and essential interrelation between intracellular Ca2+ signaling and autophagy stimulation as a proximal event in response to starvation.

  13. Experimental and theoretical charge-density analysis of 1,4-bis(5-hexyl-2-thienyl)butane-1,4-dione: applications of a virtual-atom model.

    Science.gov (United States)

    Ahmed, Maqsood; Nassour, Ayoub; Noureen, Sajida; Lecomte, Claude; Jelsch, Christian

    2016-02-01

    The experimental and theoretical charge densities of 1,4-bis(5-hexyl-2-thienyl)butane-1,4-dione, a precursor in the synthesis of thiophene-based semiconductors and organic solar cells, are presented. A dummy bond charges spherical atom model is applied besides the multipolar atom model. The results show that the dummy bond charges model is accurate enough to calculate electrostatic-derived properties which are comparable with those obtained by the multipolar atom model. The refinement statistics and the residual electron density values are found to be intermediate between the independent atom and the multipolar formalisms.

  14. Synthesis and antitumor activity of a new class of pyrazolo[4,3-e]pyrrolo[1,2-a][1,4]diazepinone analogues of pyrrolo[1,4][2,1-c]benzodiazepines.

    Science.gov (United States)

    Baraldi, P G; Leoni, A; Cacciari, B; Manfredini, S; Simoni, D; Bergomi, M; Menta, E; Spinelli, S

    1994-12-09

    A new class of pyrrolo[1,4]benzodiazepine (PBD) analogues featuring a pyrazolo[4,3-e]pyrrolo[1,2-a][1,4]diazepinone ring system has been designed and synthesized. These compounds, 2a-o, are characterized by the substitution of the aromatic A ring, characteristic of the PBDs, with a disubstituted pyrazole ring bearing alkyl and benzyl substituents at N6 or N7 and alkyl or carbomethoxy substituents at C8. Biological evaluation revealed an appreciable in vitro cytotoxic activity for compounds 2a,b,f-i.

  15. Magnetic field effect on the exciplex between all-s-trans- 1,4-diphenylbuta- 1,3-diene and 1,4-dicyanobenzene: a comparative study with other alpha,omega-diphenyl polyenes.

    Science.gov (United States)

    Sengupta, T; Basu, S

    2001-04-01

    The exciplex between all-s-trans-1,4-diphenylbuta-1,3-diene and 1,4-dicyanobenzene has been studied by steady state fluorescence along with the magnetic field effect (MFE) and compared with the other alpha,omega-diphenyl polyenes. The exciplex formation and magnetic field effect are dictated by the chain length of the polyene rather than the electronic requirement of these phenomena. The wavelength dependence of the MFE confirms the presence of two different charge-transfer complexes.

  16. Investigation and Sensory Characterization of 1,4-Cineole: A Potential Aromatic Marker of Australian Cabernet Sauvignon Wine.

    Science.gov (United States)

    Antalick, Guillaume; Tempère, Sophie; Šuklje, Katja; Blackman, John W; Deloire, Alain; de Revel, Gilles; Schmidtke, Leigh M

    2015-10-21

    This work reports the quantitation and sensory characterization of 1,4-cineole in red wine for the first time. A headspace-solid-phase microextraction-gas chromatography-mass spectrometry (HS-SPME-GC-MS) method was developed to quantitate 1,4-cineole and 1,8-cineole in 104 commercial Australian red wines. 1,4-Cineole was detected in all of the wines analyzed, with concentrations ranging from 0.023 to 1.6 μg/L. An important varietal effect was observed, with concentrations of 1,4-cineole in Cabernet Sauvignon wines (mean of 0.6 ± 0.3 μg/L) significantly higher than in Shiraz (0.07 ± 0.04 μg/L) and Pinot Noir (0.2 ± 0.2 μg/L) wines. Regional variations of both cineole isomer concentrations have been measured between wines originating from different Australian regions. Sensory studies demonstrated that the addition of 0.54 μg/L 1,4-cineole in a Cabernet Sauvignon wine, to produce a final concentration of 0.63 μg/L, was perceived significantly by a sensory panel (p wines and may be potential markers of regional typicality of these wines.

  17. Characterization of a new 1,3-1,4-β-glucanase gene from Bacillus tequilensis CGX5-1.

    Science.gov (United States)

    Wang, Jinjing; Niu, Chengtuo; Liu, Xiaoling; Chen, Xi; Li, Qi

    2014-06-01

    1,3-1,4-β-Glucanase received great interest due to its application in brewing and feed industries. Application of 1,3-1,4-β-glucanase in brewing industry helps make up for the defect that plant-derived β-glucanases are heat-sensitive. A new strain, CGX5-1, exhibited remarkable 1,3-1,4-β-glucanase, was isolated from Asian giant hornet nest and identified Bacillus tequilensis. Moreover, a new 1,3-1,4-β-glucanase gene from B. tequilensis was cloned and measured to be 720 bp encoding 239 amino acids, with a predicted molecular weight of 26.9 kDa. After expressed in Escherichia coli BL21, active recombinant enzyme of 24 kDa was detected in the supernatant of cell culture, with the activity of 2,978.2 U/mL. The new enzyme was stable in the pH 5.0-7.5 with the highest activity measured at pH 6.0. Moreover, it is thermostable within 45 to 60 °C. The property of the new recombinant enzyme makes this enzyme a broad prospect in brewing industry. Moreover, this is the first report on 1,3-1,4-β-glucanase produced by B. tequilensis.

  18. Comparison of the actions of gamma-butyrolactone and 1,4-butanediol in Swiss-Webster mice.

    Science.gov (United States)

    de Fiebre, Christopher M; de Fiebre, Nancy Ellen C; Coleman, Scott L; Forster, Michael J

    2004-04-01

    The abuse of gamma-hydroxybutyrate (GHB) and two of its precursors, gamma-butyrolactone (GBL) and 1,4-butanediol (1,4-BD) are recognized as a public health concern. Here, we report dose-response and time-course analyses for effects of GBL and 1,4-BD on locomotor activity and body temperature in Swiss-Webster mice. Locomotor activity was measured for 2 h following a single injection of one of four doses of each agent plus a saline vehicle control. At 50 mg/kg, GBL produced an initial depression of locomotor activity which was followed by stimulation of locomotor activity. In contrast, 1,4-BD at 50 mg/kg stimulated locomotor activity without producing any depression of activity. At higher doses, GBL produced primarily a dose-dependent decrease in locomotor activity that returned to baseline within 50 min. In contrast, 1,4-BD produced an initial depression which was followed by stimulation of activity. Body temperature was measured rectally across a 2.5-h time course following injection with either agent. Both drugs produced hypothermia with peak effects occurring at 20 and 30 min for both drugs for the lower and higher dose, respectively. At 150 mg/kg, GBL produced a greater hypothermic response; however, no differences in hypothermic response were observed at 100 mg/kg. These studies demonstrate that the precursor drugs to GHB have some differential actions from each other.

  19. Endogenous origin of endo-β-1,4-glucanase in common woodlouse Porcellio scaber (Crustacea, Isopoda).

    Science.gov (United States)

    Kostanjšek, Rok; Milatovič, Maša; Strus, Jasna

    2010-11-01

    Because endogenous cellulases have been observed in arthropods, the potential ability to produce cellulose degrading enzymes was examined in the terrestrial isopod Porcellio scaber, an important decomposer of decayed plant material. cDNA fragments encoding portions of two novel endo-β-1,4-glucanase amino acid sequences were amplified by RT-PCR, and the amino acid sequences predicted were affiliated to endo-β-1,4-glucanases from other arthropods, where they cluster with endo-β-1,4-glucanases of decapod crustaceans. Hybridization in situ reveals the hepatopancreas to be the primary site of gene expression and provides direct evidence of the endogenous origin of endo-β-1,4-glucanase in P. scaber. Conservation of catalytically important amino acid residues suggests that both sequences translate into functional cellulases. Cellulolytic activity was detected in hepatopancreatic extract after separation by SDS-PAGE, which included CMC as substrate. This is the first evidence of endogenous cellulases in peracarid crustaceans and gives strong support for the involvement of isopod endo-β-1,4-glucanases in the degradation of cellulose in their diet.

  20. Staging of unipolar affective illness

    Directory of Open Access Journals (Sweden)

    Ewa Ferensztajn

    2014-12-01

    Full Text Available In this article, a concept of staging of unipolar affective illness (recurrent depression is presented. In respective subchapters, three most important aspects of this issue have been discussed: 1 staging of unipolar affective illness; 2 staging of treatment-resistant depression; and 3 conversion of unipolar into bipolar affective illness. The evidence for so called neuroprogression of the illness, accumulated in recent years, has allowed for a classification of staging based on a concept of allostasis and allostatic load. In the course of illness, changes in neuroendocrine system (mainly hypothalamic pituitary-adrenal (HPA axis, immunological system, mechanisms of oxidative stress, neurotransmitters, neurotrophic factors as well as structural and functional changes of the brain occur. In their paper of 2007, Fava and Tossani elaborated a concept of staging of unipolar affective illness presenting a continuum model of five consecutive stages with specific clinical features. In the present paper, a concept of treatment-resistant depression and staging of treatment resistance is presented in the context of several models. An important determinant of treatment-resistant depression is so called subthreshold bipolarity which is connected with worse efficacy of antidepressant drugs. In the course of illness, there is a possibility of changing diagnosis from recurrent depression into bipolar affective illness. The studies on this issue show that frequency of such diagnostic conversion is 1,5% of depressed patients per year.

  1. Staging procedures in mycosis fungoides

    Energy Technology Data Exchange (ETDEWEB)

    Griem, M.L.; Moran, E.M.; Ferguson, D.J.; Mettler, F.A.; Griem, S.F.

    1975-01-01

    Mycosis fungoides (MF) in deep-seated lymph nodes, spleen or liver appears to be associated with a lack of response of the disease to topical external therapy. Fourteen patients with mycosis fungoides were clinically staged and had a staging laparotomy. Myosis fungoides was found in the lymph nodes of 3 of these patients, in the spleen in 4 and in the liver of 2 cases. Patients with adenopathy, or with splenomegaly or abnormal spleen scans, should be considered for surgical staging to determine the extent of extracutaneous disease. The documentation of extracutaneous MF becomes necessary in the development of new therapeutic approaches. (auth)

  2. Properties of a thermoactive beta-1,3-1,4-glucanase (lichenase) from Clostridium thermocellum expressed in Escherichia coli.

    Science.gov (United States)

    Schimming, S; Schwarz, W H; Staudenbauer, W L

    1991-05-31

    A Clostridium thermocellum gene (licB) encoding a thermoactive 1,3-1,4-beta-glucanase (lichenase) with a molecular weight of about 35,000 was localized on a 1.5-kb DNA fragment by cloning and expression in E. coli. The enzyme acts on beta-glucans with alternating beta-1,3- and beta-1,4-linkages such as barley beta-glucan and lichenan, but not on beta-glucans containing only 1,3- or 1,4-glucosidic bonds. It is active over a broad pH range (pH 5-12) and has a temperature optimum around 80 degrees C. The C. thermocellum lichenase is unusually resistant against inactivation by heat, ethanol or ionic detergents. These properties make the enzyme highly suitable for industrial application in the mashing process of beer brewing.

  3. Observation of a fractional quantum Hall state at v=1/4 in a wide GaAs quantum well.

    Energy Technology Data Exchange (ETDEWEB)

    Pan, Wei; Tsui, Daniel Chee (Princeton University, Princeton, NJ); Baldwin, K. W. (Bell Labs, Lucent Technologies, Murray Hill, NJ); West, Ken W. (Bell Labs, Lucent Technologies, Murray Hill, NJ); Pfeiffer, Loren N.; Luhman, D. R. (Princeton University, Princeton, NJ)

    2008-10-01

    We report the observation of an even-denominator fractional quantum Hall state at {nu}=1/4 in a high quality, wide GaAs quantum well. The sample has a quantum well width of 50 nm and an electron density of n{sub e}=2.55 x 10{sup 11} cm{sup -2}. We have performed transport measurements at T{approx}35 mK in magnetic fields up to 45 T. When the sample is perpendicular to the applied magnetic field, the diagonal resistance displays a kink at {nu}=1/4. Upon tilting the sample to an angle of {theta}=20.3{sup o} a clear fractional quantum Hall state emerges at {nu}=1/4 with a plateau in the Hall resistance and a strong minimum in the diagonal resistance.

  4. Review of time-dependent fatigue behavior and life prediction for 2 1/4 Cr-1 Mo steel. [LMFBR

    Energy Technology Data Exchange (ETDEWEB)

    Booker, M.K.; Majumdar, S.

    1982-01-01

    Available data on creep-fatigue life and fracture behavior of 2 1/4 Cr-1 Mo steel are reviewed. Whereas creep-fatigue interaction is important for Type 304 stainless steel, oxidation effects appear to dominate the time-dependent fatigue behavior of 2 1/4 Cr-1 Mo steel. Four of the currently available predictive methods - the Linear Damage Rule, Frequency Separation Equation, Strain Range Partitioning Equation, and Damage Rate Equation - are evaluated for their predictive capability. Variations in the parameters for the various predictive methods with temperature, heat of material, heat treatment, and environment are investigated. Relative trends in the lives predicted by the various methods as functions of test duration, waveshape, etc., are discussed. The predictive methods will need modification in order to account for oxidation and aging effects in the 2 1/4 Cr-1 Mo steel. Future tests that will emphasize the difference between the various predictive methods are proposed.

  5. Transition Metal Complexes of 1, 4(2'-Hydroxyphenyl-1-yl di-imino azine: Synthesis, Characterization and Antimicrobial Studies

    Directory of Open Access Journals (Sweden)

    M. Revanasiddappa

    2008-01-01

    Full Text Available The synthesis and characterization of first row transition metal complexes of the 1, 4(2'-hydroxyphenyl-1-yl di-imino azine {1,4(2'HPDA} are reported. The complexes have been characterized by elemental analysis, molar conductance, magnetic studies, IR, 1H NMR and UV-visible studies. They have the stoichiometry of the type [M{1,4(2'HPDA}2 2H2O ] and [M'L2] where M= Mn(II, Fe(III, Co(II, Ni(II and Cu(II, and M' = ZrO(II, VO(II, Zn(II, Cd(II, and Hg(II. The antibacterial and antifungal activity of the metal complexes has been investigated. Both ligand and complexes have shown good antibacterial and antifungal activity.

  6. Distribution, structure and biosynthetic gene families of (1,3;1,4)-β-glucan in Sorghum bicolor.

    Science.gov (United States)

    Ermawar, Riksfardini A; Collins, Helen M; Byrt, Caitlin S; Betts, Natalie S; Henderson, Marilyn; Shirley, Neil J; Schwerdt, Julian; Lahnstein, Jelle; Fincher, Geoffrey B; Burton, Rachel A

    2015-04-01

    In cereals, the presence of soluble polysaccharides including (1,3;1,4)-β-glucan has downstream implications for human health, animal feed and biofuel applications. Sorghum bicolor (L.) Moench is a versatile crop, but there are limited reports regarding the content of such soluble polysaccharides. Here, the amount of (1,3;1,4)-β-glucan present in sorghum tissues was measured using a Megazyme assay. Very low amounts were present in the grain, ranging from 0.16%-0.27% (w/w), while there was a greater quantity in vegetative tissues at 0.12-1.71% (w/w). The fine structure of (1,3;1,4)-β-glucan, as denoted by the ratio of cellotriosyl and cellotetraosyl residues, was assessed by high performance liquid chromatography (HPLC) and ranged from 2.6-3:1 in the grain, while ratios in vegetative tissues were lower at 2.1-2.6:1. The distribution of (1,3;1,4)-β-glucan was examined using a specific antibody and observed with fluorescence and transmission electron microscopy. Micrographs showed a variable distribution of (1,3;1,4)-β-glucan influenced by temporal and spatial factors. The sorghum orthologs of genes implicated in the synthesis of (1,3;1,4)-β-glucan in other cereals, such as the Cellulose synthase-like (Csl) F and H gene families were defined. Transcript profiling of these genes across sorghum tissues was carried out using real-time quantitative polymerase chain reaction, indicating that, as in other cereals, CslF6 transcripts dominated.

  7. 1,4-benzoquinone-induced STAT-3 hypomethylation in AHH-1 cells: Role of oxidative stress

    Directory of Open Access Journals (Sweden)

    Jing Yang

    2015-01-01

    Full Text Available Benzene, a known occupational and environmental contaminant, is associated with increased risk of leukemia. The objectives of this study were to elucidate the regulatory mechanism of the hypomethylated STAT3 involved in benzene toxicity in vitro. As 1,4-benzoquinone (1,4-BQ is one of benzene’s major toxic metabolites, AHH-1 cells were treated by 1,4-BQ for 24 h with or without pretreatment of the antioxidant a-LA or the methyltransferase inhibitor, 5-aza-2′ deoxycytidine (5-aza. The cell viability was investigated using the 3-(4, 5-dimethylthiazol-2-yl-2,5-diphenyltetrazolium bromide (MTT assay. ROS was determined via 2′,7′-dichlorodihydrofluorescein diacetate (DCFDA flow cytometric assays. The level of oxidative stress marker 8-OHdG was measured by enzyme-linked immunosorbent assay. Methylation-specific PCR was used to detect the methylation status of STAT3. Results indicated the significantly increasing expression of ROS and 8-OHdG which accompanied with STAT3 hypomethylation in 1,4-BQ-treated AHH-1 cells. α-LA suppressed the expression of both ROS and 8-OHdG, simultaneously reversed 1,4-BQ-induced STAT3 hypomethylation. However, although the methylation inhibitor, 5-aza reduced the expression level of ROS and 8-OHdG, but had no obvious inhibiting effect on STAT3 methylation level. Taken together, oxidative stress are involved 1,4-BQ-induced STAT3 methylation expression.

  8. Synthesis, radiosynthesis and biological evaluation of 1, 4-dihydroquinoline derivatives as new carriers for specific brain delivery

    Energy Technology Data Exchange (ETDEWEB)

    Foucout, L.; Bohn, P.; Dupas, G.; Marsais, F.; Levacher, V. [Laboratoire de Chimie Organique Fine et Heterocyclique, UMR 6014, IRCOF, CNRS, Universite et INSA de Rouen, B.P. 08 F-76131, Mont- Saint-Aignan Cedex (France); Gourand, F.; Dhilly, M.; Barre, L. [Groupe de Developpements Methodologiques en Tomographie par Emission de Positons, CEA/DSV/I2BM/CI-NAPS UMR6232, Universite de Caen Basse Normandie, Caen (France); Bohn, P.; Costentin, J. [Laboratoire de Neuropharmacologie Experimentale associe au CNRS, FRE-2735, Faculte de Medecine et de pharmacie, Universite de Rouen, F-76000 (France); Abbas, A. [Inserm-EPHE-Universite de Caen Basse-Normandie, Unite U923, GIP Cyceron, CHU Cote de Nacre, Caen (France)

    2009-07-01

    In spite of numerous reports dealing with the use of 1, 4-dihydro-pyridines as carriers to deliver biological active compounds to the brain, this chemical delivery system (CDS) suffers from poor stability of the 1, 4-dihydropyridine derivatives towards oxidation and hydration reactions seriously limiting further investigations in vivo. In an attempt to overcome these limitations, we report herein the first biological evaluation of more stable annellated NADH models in the quinoline series as relevant neuro-active drug-carrier candidates. The radiolabeled 1, 4-dihydroquinoline [{sup 11}C]1a was prepared to be subsequently peripherally injected in rats. The injected animals were sacrificed and brains were collected. The radioactivity measured in rat brain indicated a rapid penetration of the carrier [{sup 11}C]1a into the CNS. HPLC analysis of brain homogenates showed that oxidation of [{sup 11}C]1a into the corresponding quinolinium salt [{sup 11}C]4a was completed in less than 5 min. An in vivo evaluation in mice is also reported to illustrate the potential of such 1, 4-dihydroquinoline derivatives to transport a neuro-active drug in the CNS. For this purpose, g-aminobutyric acid (GABA), well known to poorly cross the brain blood barrier (BBB) was connected to this 1, 4-dihydroquinoline-type carrier. After i.p. injection of 1, 4-dihydroquinoline-GABA derivative 1b in mice, a significant alteration of locomotor activity (LMA) was observed presumably resulting from an enhancement of central GABAergic activity. These encouraging results give strong evidence for the capacity of carrier-GABA derivative 1b to cross the BBB and exert a pharmacological effect on the CNS. This study paves the way for further progress in designing new redox chemical delivery systems. (authors)

  9. CalCOFI Larvae Stages

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Developmental stages (yolk sac, preflexion, flexion, postflexion, or transformation) of selected fish larvae captured in CalCOFI icthyoplankton nets.

  10. Process for manufacturing bis(2-methoxyethyl)-2,3,6,7-tetracyano-1,4,5,8,9,10-hexazaanthracene

    Science.gov (United States)

    Rasmussen, Paul George; Lawton, Richard Graham

    2014-06-03

    A process to manufacture substituted tetracyano-hexaazatricyclics with the substitutions occurring at the 9 and 10 hydrogens. The process begins with 2,3-dichloro-5,6-dicyanopyrazine, which is reacted to form the desired tetracyano-hexaazatricyclic. Different process embodiments enable different reaction paths to the desired tetracyano-hexaazatricyclic. Different tetracyano-hexaazatricyclic embodiments include bis(2-methoxyethyl)-2,3,6,7-tetracyano-1,4,5,8,9,10-hexazaanthracene and bis(2-methoxyethoxyethyl)-2,3,6,7-tetracyano-1,4,5,8,9,10-hexazaanthracen- e.

  11. 6-Methyl-1,3,5-triazine-2,4-diamine butane-1,4-diol monosolvate

    Directory of Open Access Journals (Sweden)

    Rajni M. Bhardwaj

    2012-12-01

    Full Text Available The title co-crystal, C4H7N5·C4H10O2, crystallizes with one molecule of 6-methyl-1,3,5-triazine-2,4-diamine (DMT and one molecule of butane-1,4-diol in the asymmetric unit. The DMT molecules form ribbons involving centrosymmetric R22(8 dimer motifs between DMT molecules along the c-axis direction. These ribbons are further hydrogen bonded to each other through butane-1,4-diol, forming sheets parallel to (121.

  12. A Kinetically Mechanistic Investigation of Oxidation of 1,4-Butanediamine by Ag(Ⅲ)Complex in Alkaline Medium

    Institute of Scientific and Technical Information of China (English)

    SONG,Changying; SHAN,Jinhuan; Shen,Shigang; Sun,Hanwen

    2009-01-01

    Kinetics and mechanism of oxidation of 1,4-butanediamine by a Ag (Ⅲ)complex were studied spectropho-tometrically in alkaline medium at constant ion strength. The reaction shows first order with respect to the Ag(Ⅲ)complex and 1,4.butanediamine respectively. The second order rate constant,k`:increased with the increasing in[OH-],and decreased with the increasing in[IO4-4].A plausible mechanism was proposed from the kinetics study.The rate equations derived from the mechanism Can explain all experimental phenomena. The activation parameters were calculated.

  13. Poly[di-μ4-benzene-1,4-dicarboxylato-μ6-succinato-diholmium(III

    Directory of Open Access Journals (Sweden)

    Qin He

    2008-01-01

    Full Text Available The title compound, [Ho2(C4H4O4(C8H4O42]n, was synthesized hydrothermally. The Ho atom is coordinated by four O atoms from four benzene-1,4-dicarboxylate (BDC anions and four O atoms from three succinate anions, in a distorted square-antiprismatic coordination geometry. The antiprisms are bridged by the benzene-1,4-dicarboxylate and succinate anions, into a three-dimensional coordination network. The succinate anions are located on centres of inversion.

  14. 半乳糖β-1,4-糖苷键在瘢痕疙瘩组织中的定位与表达%Location and expression of galactose β-1,4-glycosidic bonds in keloid tissue

    Institute of Scientific and Technical Information of China (English)

    杨圣菊; 孟国梁; 陈晓栋

    2013-01-01

    目的 探讨半乳糖β-1,4-糖苷键在瘢痕疙瘩组织中的合成、定位及糖蛋白半乳糖基化在瘢痕疙瘩形成机制中的作用.方法 Lectin印迹法观察瘢痕疙瘩、增生性瘢痕和正常皮肤组织中糖蛋白的糖基化水平;饱和苦味酸-天狼猩红偏振光法观察组织学结构及胶原的形态与分布.分析组织中Ⅰ、Ⅲ型胶原的比例;蓖麻凝集素-Ⅰ免疫荧光组化法分析组织中半乳糖β-1,4-糖苷键的表达与定位,并与Ⅰ型前胶原α1共定位.结果 经糖链染色,与正常皮肤组织相比,瘢痕疙瘩组织在约30 000和40 000处糖蛋白的半乳糖β-1,4-糖苷键表达增高.偏振光显微镜显示,瘢痕疙瘩组织中含有大量Ⅰ型胶原纤维,约占(71.53±4.03)%,Ⅰ、Ⅲ型胶原比例为2.56±0.53,高于正常皮肤组织(P<0.05).免疫荧光发现,半乳糖β-1,4-糖苷键均匀分布在瘢痕疙瘩组织成纤维细胞胞膜和胞质内,与正常皮肤组织相比其表达量明显增加,且与Ⅰ型前胶原α1存在共定位.结论 瘢痕疙瘩组织中存在着半乳糖β-1,4-糖苷键的表达变化,且主要定位于成纤维细胞,提示半乳糖β-1,4-糖苷键可能参与瘢痕疙瘩修复过程中纤维过度增生相关因子的修饰调控.%Objective To observe the expression and location of galactose β-1,4-glycosidic bonds (Gal β-1,4-GlcNAc) in keloid tissue,and to investigate the role of glycoprotein galactosylation in the formation of keloid.Methods This study included 10 keloid tissue specimens,7 hyperplastic scar tissue specimens,and 6 normal skin specimens.Lectin blot analysis was performed to measure the glycosylation level of glycoproteins,saturated picric acid-Sirius red staining followed by polarization microscopy to observe the type,expression and distribution of collagens in these specimens.The type Ⅰ/type Ⅲ collagen ratio was calculated.Immunofluorescence-based histochemistry was carried out by using Ricinus communis agglutinin I to

  15. Synthesis and Crystal Structure of N-tert-butyl-N′-(2,4-dichlorobenzoyl)-N-[1-(4-chlorophenyl)-1, 4-dihydro-6-methylpyridazine-4-oxo-3- carbonyl] hydrazine

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    The title compound N-tert-butyl-N¢-(2,4-dichlorobenzoyl)-N-[1-(4-chlorophenyl)- 1,4-dihydro-6-methylpyridazine-4-oxo-3-carbonyl]hydrazine [(C23H21N4O3Cl3)2·1.5H2O, Mr = 1042.60] was prepared by the reaction of 1-(4-chlorophenyl)-1,4-dihydro-4-oxo-6- methylpyridazine-3-carboxylic acid with chloroformate ethyl ester, then with N′-tert-butyl-N- (2,4-dichlorobenzoyl) hydrazine in the present of triethylamine. The crystal structure has been determined by X-ray diffraction. The crystal belongs to Monoclinic, space group P21/c, with unit cell constants a =11.4948(9), b=12.7495(10), c=35.854(3) ?, β =92.964(2)°, Z=4, V=5247.6(7) ?3, Dc = 1.320 Mg/m3, F(000) = 2156 , μ (MoKa)= 0.385, R = 0.0661, wR = 0.1875, for 9151 observed reflections( I >2σ(I)). The structure is a dimer linked by intermolecular hydrogen bond which can be observed between N(1)- H…O(6), N(5)- H…O(3). The distances are 2.068 and 2.027? respectively.

  16. Staged regenerative sorption heat pump

    Science.gov (United States)

    Jones, Jack A. (Inventor)

    1995-01-01

    A regenerative adsorbent heat pump process and system for cooling and heating a space. A sorbent is confined in a plurality of compressors of which at least four are first stage and at least four are second stage. The first stage operates over a first pressure region and the second stage over a second pressure region which is higher than the first. Sorbate from the first stage enters the second stage. The sorbate loop includes a condenser, expansion valve, evaporator and the compressors. A single sorbate loop can be employed for single-temperature-control such as air conditioning and heating. Two sorbate loops can be used for two-temperature-control as in a refrigerator and freezer. The evaporator temperatures control the freezer and refrigerator temperatures. Alternatively the refrigerator temperature can be cooled by the freezer with one sorbate loop. A heat transfer fluid is circulated in a closed loop which includes a radiator and the compressors. Low temperature heat is exhausted by the radiator. High temperature heat is added to the heat transfer fluid entering the compressors which are desorbing vapor. Heat is transferred from compressors which are sorbing vapor to the heat transfer fluid, and from the heat transfer fluid to the compressors which are desorbing vapor. Each compressor is subjected to the following phases, heating to its highest temperature, cooling down from its highest temperature, cooling to its lowest temperature, and warming up from its lowest temperature. The phases are repeated to complete a cycle and regenerate heat.

  17. Bipolar disorder: staging and neuroprogression

    Directory of Open Access Journals (Sweden)

    Rodrigues, Aline André

    2014-04-01

    Full Text Available In bipolar disorder illness progression has been associated with a higher number of mood episodes and hospitalizations, poorer response to treatment, and more severe cognitive and functional impairment. This supports the notion of the use of staging models in this illness. The value of staging models has long been recognized in many medical and malignant conditions. Staging models rely on the fact that different interventions may suit different stages of the disorder, and that better outcomes can be obtained if interventions are implemented earlier in the course of illness. Thus, treatment planning would benefit from the assessment of cognition, functioning and comorbidities. Staging may offer a means to refine treatment options, and most importantly, to establish a more precise diagnosis. Moreover, staging could have utility as course specifier and may guide treatment planning and better information to patients and their family members of what could be expected in terms of prognosis. The present study reviews the clinical and biological basis of the concept of illness progression in bipolar disorder.

  18. Method of oxygen-enriched two-stage underground coal gasification

    Institute of Scientific and Technical Information of China (English)

    Liu Hongtao; Chen Feng; Pan Xia; Yao Kai; Liu Shuqin

    2011-01-01

    Two-stage underground coal gasification was studied to improve the caloric value of the syngas and to extend gas production times. A model test using the oxygen-enriched two-stage coal gasification method was carried out. The composition of the gas produced, the time ratio of the two stages, and the role of the temperature field were analysed. The results show that oxygen-enriched two-stage gasification shortens the time of the first stage and prolongs the time of the second stage. Feed oxygen concentrations of 30%,35%, 40%, 45%, 60%, or 80% gave time ratios (first stage to second stage) of 1:0.12, 1:0.21, 1:0.51, 1:0.64,1:0.90, and 1:4.0 respectively. Cooling rates of the temperature field after steam injection decreased with time from about 19.1-27.4 ℃/min to 2.3-6.8 ℃/min. But this rate increased with increasing oxygen concentrations in the first stage. The caloric value of the syngas improves with increased oxygen concentration in the first stage. Injection of 80% oxygen-enriched air gave gas with the highest caloric value and also gave the longest production time. The caloric value of the gas obtained from the oxygenenriched two-stage gasification method lies in the range from 5.31 MJ/Nm3 to 10.54 MJ/Nm3.

  19. Gene expression regulation of sprout inhibition and water retention genes in potatoes by 1,4-dimethylnapthalene (DMN)

    Science.gov (United States)

    The potato is the fifth largest agricultural crop in the world and a dietary staple in many cultures. When sprouting, the potato produces the toxin solanine and begins to sweeten, a process that makes the potato undesirable for consumer use. Sprout inhibitors such as 1,4-dimethylnapthalene (DMN) ar...

  20. Sequential synthesis of amino-1,4-naphthoquinone-appended triazoles and triazole-chromene hybrids and their antimycobacterial evaluation.

    Science.gov (United States)

    Devi Bala, Balasubramanian; Muthusaravanan, Sivasubramanian; Choon, Tan Soo; Ashraf Ali, Mohamed; Perumal, Subbu

    2014-10-06

    A general method for the synthesis of a library of hitherto unreported amino-1,4-naphthoquinone-appended triazoles was accomplished via a sequential three-component reaction of substituted N-propargylaminonaphthoquinones with variously substituted alkyl bromides/2-bromonaphthalene-1,4-dione and sodium azide in the presence of Et3N/CuI in water. Aminonaphthoquinone-appended iminochromene-triazole hybrid heterocycles were also synthesized from the amino-1,4-naphthoquinone-appended-1,2,3-triazolylacetonitriles. All the triazole hybrids were screened for their in vitro activity against Mycobacterium tuberculosis H37Rv (MTB). Among the triazoles, 2-(((1-benzyl-1H-1,2,3-triazol-4-yl)methyl)(4-(trifluoromethyl)phenyl)amino)naphthalene-1,4-dione (7d) emerged as the most active one with IC50 = 1.87 μM, being more potent than the anti-TB drugs, cycloserine (6 times), pyrimethamine (20 times) and equipotent as the drug ethambutol (IC50 < 1.56 μM).