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  • 1
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    Unknown
    Boulder : Periodicals Archive Online (PAO)
    East European quarterly. 14:2 (1980:Summer) 241 
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 114 (1983), S. 1005-1007 
    ISSN: 1434-4475
    Keywords: Ethyl acetoacetate ; Homolytic photocleavage ; Solvent effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Bei der Bestrahlung wäßriger Lösungen von Acetessigester mit UV-Licht bilden sich Essigsäure, Ethylacetat, Acetonylaceton und Diethylsuccinat. Ein möglicher Weg zur Entstehung dieser Produkte ist die Rekombination der durch homolytische Trennung der Bindungen zwischen den α-β und β-γ-Kohlenstoffatomen des β-Ketoesters gebildeten Radikale, sowie ihre Wechselwirkung mit dem Lösungsmittel.
    Notes: Abstract Irradiation of ethyl acetoacetate in water yielded acetic acid, ethyl acetate, acetonylacetone and diethyl succinate. The possible route of their formation is the recombination of the radicals resulting from the cleavage of the bonds between α-β and β-γ carbon atoms of the β-keto ester and/or their interaction with the solvent.
    Type of Medium: Electronic Resource
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  • 3
    facet.materialart.
    Unknown
    Washington, D.C. : Periodicals Archive Online (PAO)
    Human events. 44:31 (1984:Aug. 4) 19 
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  • 4
    ISSN: 1432-2048
    Keywords: Antigen ; Callus ; Cell suspension cultures ; Proteins (in differentiation) ; Seedling ; Vascular cylinder (stele) ; Zea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A group of antigenically distinct proteins characteristic for the tissue complex of the vascular cylinders was found in maize (Zea mays L.) seedlings using an immunofiltration technique. Specific stelar antigens present in the fully developed stele (vascular cylinder) of the primary root were also found in steles extracted from adventitious roots and from the mesocotyl but were absent, within the limits of sensitivity of the immunodiffusion tests employed, in root cortex and epidermis. Some of the stelar antigens were also evident in the meristem of the primary root and were present in traces in the scutellum, the mesocotyl node, and the primary leaves plus coleoptile. The specific stelar antigens could be traced in 13- and 15-day-old developing embryos and were definitely expressed by the 21 st day after pollination. Several stelar-specific antigens were found in embryo-derived callus tissues and in stem-derived cells maintained in serial suspension culture. Higher resolution of the stelar antigens by a modified technique of crossed immunoelectrophoresis was used to demonstrate several minor stelar antigens that were presumably characteristic exclusively of the completely differentiated stele. This technique along with sequential immunoprecipitation of labelled proteins provided a semiquantitative estimate of the specific stelar antigens in the meristem and the stele of the primary root, and in suspension-cultured cells which were devoid of noticeable signs of vascular differentiation.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The genome organization of the marine snail Rapana thomasiana Grosse (Gastropoda), genome size 2.7 pg, was studied by reassociation kinetics, S1-nuclease assay, and restriction enzyme analysis. The slow-reassociating (single-copy) fraction represented only 21% of the genome. The average length of 80% of the single-copy sequences was less than 700 bp and the remaining 20% no longer than 1,400 bp. Longer stretches of unique DNA were not observed. The genome contained an unusually high percent-age of inverted repeats: at standard fragment length the zero-time binding fraction amounted to 25% of the genome. Foldback structures ranging from 200 bp to more than 10 kb were observed after S1-nuclease treatment. They were randomly distributed throughout at least 85% of the genome, and the spacings between them were estimated to be about 1,600 bp on the average. The middle-repetitive DNA (45% of the genome) contained two kinetic components, repeated 430 and 65,000 times per genome, respectively. It was found that the majority of the repetitive sequences are about 300 bp long. Longer repeats (about 2,000 bp) were also observed, comprising a small portion of the genome. The inverted repeats, the middle-repetitive, and the singly-copy sequences were fully interspersed in the genome, thus indicating that R. thomasiana DNA is not organized in either the Xenopus or the Drosophila pattern type. — R. thomasiana is the only mollusc so far in which a satellite DNA has been found. It is organized in tandem repeats of 1,460 bp with a very complex organization but a low degree of divergence.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-0738
    Keywords: Acetylcholinesterase reactivators ; Bis-pyridinium monooximes ; Organophosphorus compounds ; Paraoxon ; Sarin ; VX ; Soman
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Eleven isomeric phenylhydroxymethyl and cyclohexylhydroxymethyl derivatives of 1-(2-hydroxyiminomethyl-1-pyridinio)-3-(1-pyridinio)-2-oxapropane diiodide and 1-(4-hydroxyiminomethyl-1-pyridinio)-3-(1-pyridinio)-2-oxapropane diiodide were prepared and characterized by spectroscopic methods and pKa values. The inhibitory power (I50) of the investigated oximes was determined on purified bovine erythrocyte AChE and human erythrocyte AChE. Percentage of reactivation after 30 min was estimated after inhibition of human erythrocyte AChE by sarin, VX, and paraoxon. The in vitro protective index against inhibition by soman has been calculated using bovine erythrocyte AChE. Their I50 for human erythrocyte AChE varied in the range of 9–61 (10−4 mol · dm−3) and for purified bovine erythrocyte AChE in the range of 11–57 (10−5 mol · dm−3). With 2 × 10−5 mol · dm−3 of oximes the percent of reactivation was: 0–63% for paraoxon inhibited AChE, 12–73% for sarin inhibited AChE and 11–80% for VX inhibited AChE. With the exception of 1-(2-hydroxyiminomethyl-1-pyridinio)-3-(4-phenylhydroxymethyl-1-pyridinio)-2-oxapropane diiodide (6) the derivatives of 4-hydroxyiminomethylpyridine are by far better reactivators. None of the compounds could protect purified bovine erythrocyte AChE from inhibition by soman.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1573-4978
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract It has been shown in a previous paper (8) that the prime product of reassociation of related DNA sequences under open experimental conditions are mismatched duplexes which undergo ‘maturation’ upon further incubation. Due to this feature, the Tm value of the duplexes of a large number of DNAs is strongly dependent on the Cot value. Here we present data showing that the Tm of the duplexes of such type of DNAs depends also on the concentration of DNA in the range of one and the same Cot value. The significance of this finding in studying the taxonomic relationship by DNA-DNA hybridisation is discussed.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-2323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Le choc traumatique a été provoqué chez 130 rats en les plaÇant dans un tambour Noble-Collip soumis à 600 révolutions, à la vitesse de 40 révolutions par minute. L'expérimentation a eu pour objet d'évaluer l'efficacité thérapeutique du fructose-1,6-diphosphate (FDP) en étudiant le taux de survie quand l'agent était administré à la fois avant et après l'expérimentation, d'une part, et seulement après l'expérimentation, d'autre part. Dans le premier groupe (n=50), où le traitement fut institué avant et après le traumatisme, les rats furent répartis au hasard en 3 sous-groupes: 1) 20 rats reÇurent 350 mg/kg de FDP avant et après le traumatisme, 2) 20 autres reÇurent de la mÊme faÇon des quantités égales de glucose, 3) 3 ne reÇurent ni FDP ni glucose. Dans le deuxième groupe (n=80), 35 rats reÇurent du FDP après le traumatisme, 35 du glucose et 10 ne furent soumis à aucun traitement. Les résultats sont les suivants: le taux de survie chez les rats traités par le FDP avant et après le traumatisme atteignit 85%, il fut seulement de 30% chez ceux qui reÇurent du glucose et de 20% chez ceux qui ne subirent aucun traitement. Dans le second groupe où les rats furent traités seulement après le traumatisme, le taux de survie fut de 66% pour ceux qui reÇurent du FDP, de 31% pour ceux qui reÇurent du glucose et de 20% chez les rats qui ne furent soumis à aucun traitement. Les résultats de cette étude et ceux obtenus en présence d'autres types de choc indiquent que le FDP possède une action thérapeutique anti-choc indiscutable, cette action étant de type métabolique et relevant de la production d'énergie endogénique grâce à la glycolyse.
    Abstract: Abstracto El shock traumático fue inducido en 130 ratas volteándolas en un tambor de Noble-Collip por un total de 600 revoluciones a 40 rotaciones/minuto. El protocolo original fue diseñado para evaluar la efectividad terapéutica de la fructosa-1,6-difosfato (FDP) en la reducción de la tasa de mortalidad cuando se administra antes y después del trauma, o solamente después del trauma. En el primer grupo (n=50), en el cual el tratamiento fue administrado antes y después del trauma, los animales fueron asignados a 3 subgrupos en la forma siguiente: 20 ratas recibieron 350 mg/kg de FDP antes del trauma y 350 mg/kg adicionales postrauma; otras 20 ratas recibieron iguales cantidades de glucosa de la misma manera, y 10 ratas no recibieron tratamiento. En el grupo tratado solo después de producida la lesión (n= 80), 35 ratas recibieron 350 mg/kg de FDP después del trauma; otras 35 recibieron glucosa; 10 no recibieron tratamiento. Las ratas de los diferentes subgrupos fueron volteadas al mismo tiempo. Las tasas de supervivencia en los subgrupos fue de 85% para aquellas que recibieron FDP, de 30% para las tratadas con glucosa (p〈0.005) y de 20% para las no tratadas. En los animales que fueron tratados después del trauma, también hubo un aumento significativo de la tasa de supervivencia para los tratados con FDP (66%), en tanto que para aquellos que recibieron glucosa un aumento de 31% (p〈 0.01) y de 20% para los no tratados. Los resultados del presente estudio y aquellos obtenidos en otros tipos etiológicos de shock, indican que el FDP posee una profunda actividad terapéutica antishock y que esta acción parece ser metabólicamente inducida mediante el aumento de la production de energía endógena por vía de la glicolisis.
    Notes: Abstract Traumatic shock was induced in 130 rats by tumbling them in a Noble-Collip drum for a total of 600 revolutions at 40 rotations/min. The experimental protocol was designed to evaluate the therapeutic effectiveness of fructose 1,6-diphosphate (FDP) in reducing the mortality rate when given both prior to and following the trauma, or only following the trauma. In the first group (n=50) in which the treatment was given prior to and after trauma, the animals were randomly assigned to 3 subgroups as follows: 20 rats received 350 mg/kg of FDP prior to and an additional 350 mg/kg after trauma; 20 other rats received in the same manner equal amounts of glucose; and 10 rats received no treatment. In the group treated only after inflicting the injury (n=80), 35 rats received 350 mg/kg of FDP after trauma; another 35 received glucose; and 10 received no treatment. The rats from the different subgroups were tumbled at the same time. Survival rates in the pretreated subgroups were 85% for those receiving FDP, 30% for glucose-treated animals (p〈 0.005), and 20% for the nontreated ones. In the animals that were treated after trauma, there was also a significant increase in survival rate for the FDP-treated ones (66%), while for those receiving glucose it was 31% (p〈0.01), and 20% for the nontreated ones. The results of the present study and those obtained in other etiological types of shock indicate that FDP has profound antishock therapeutic activity. This action appears to be metabolically mediated by augmenting the endogenous energy production via glycolysis.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    European journal of nuclear medicine 5 (1980), S. 75-84 
    ISSN: 1619-7089
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract As an alternative procedure to the exercise stress test used in myocardial scanning, vasoactive drugs were employed to elicit deficits in blood flow to myocardial regions supplied by stenotic arteries which maintain normal resting flow or collateral circulation. The data were collected from 35 dogs, some of which had partial stenosis (70–75%) on either major branch of the left coronary artery, and others which had Ameroid constrictor implants. The effects of lidoflazine, dipyridamole, and nitroglycerin on coronary hemodynamics and myocardial dispersion of potassium 43(43K) in animals with partial stenosis were evaluated in ten acute experiments. In the pilot studies, four rapid serial rectilinear control scans from 43K (750 μCi) were reported; dipyridamole (Persantin), lidoflazine, or nitroglycerin were then administered intravenously. When the selected drug reached a peak vasodilatative effect, a second equal bolus of 43K was given and four additional scans recorded. The last scan from the first set was subtracted from the corresponding regional count rates of all serial scans from the second set, and the resulting images were interpreted to be myocardial perfusion patterns induced by the drug intervention. The later studies were performed by giving only a single isotope injection after administering the drug. The control scans from dogs with partial stenosis or an Ameroid constrictor showed homogeneous distribution of the myocardial 43K. When drugs were used, the region supplied by compromised circulation became apparent because of lower counts when compared to the normally perfused ones. Coronary vasodilators, as opposed to postexercise in myocardial imaging, have a lesser effect on cardiac dynamics, peripheral hemodynamics, and also double the 43K uptake in normally perfused myocardium.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1573-8205
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Type of Medium: Electronic Resource
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