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  • 2000-2004  (4)
  • 1995-1999  (15)
  • 1970-1974  (21)
  • 1960-1964  (5)
  • 1
    Digitale Medien
    Digitale Medien
    s.l. : American Chemical Society
    Journal of the American Chemical Society 85 (1963), S. 2616-2621 
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Plant Physiology and Plant Molecular Biology 47 (1996), S. 509-540 
    ISSN: 1040-2519
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Biologie
    Notizen: Abstract Plant gene responses to changing carbohydrate status can vary markedly. Some genes are induced, some are repressed, and others are minimally affected. As in microorganisms, sugar-sensitive plant genes are part of an ancient system of cellular adjustment to critical nutrient availability. However, in multicellular plants, sugar-regulated expression also provides a mechanism for control of resource distribution among tissues and organs. Carbohydrate depletion upregulates genes for photosynthesis, remobilization, and export, while decreasing mRNAs for storage and utilization. Abundant sugar levels exert opposite effects through a combination of gene repression and induction. Long-term changes in metabolic activity, resource partitioning, and plant form result. Sensitivity of carbohydrate-responsive gene expression to environmental and developmental signals further enhances its potential to aid acclimation. The review addresses the above from molecular to whole-plant levels and considers emerging models for sensing and transducing carbohydrate signals to responsive genes.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    facet.materialart.
    Unbekannt
    Leiden : Periodicals Archive Online (PAO)
    Journal for the Study of Judaism in the Persian, Hellenistic, and Roman Period. 3 (1972) 117-148 
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Ltd
    Alimentary pharmacology & therapeutics 20 (2004), S. 0 
    ISSN: 1365-2036
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Aim : To assess the pharmacokinetics of alosetron, its effect on in vivo enzyme activities, and influence of demographic factors during repeated dosing.Methods : Thirty healthy men and women received 1 mg oral alosetron twice-daily for 29.5 days and a single oral dose of a metabolic probe cocktail before and on the last day of alosetron dosing. Serum alosetron concentrations were measured on days 1, 8, 15, 22 and 29. Probe-substrate and metabolite concentrations were measured after each cocktail dose.Results : Alosetron accumulation in serum was negligible. Exposure to alosetron did not alter probe-metabolite/substrate ratios associated with CYP2C19, 2E1, 2C9, or 3A4 activity, but modestly decreased those associated with CYP1A2 and N-acetyltransferase activity. Systemic exposure to alosetron was higher in women, positively correlated with age and body mass index, and negatively correlated with CYP1A2 activity. Incidence of constipation was higher in women, but not associated with alosetron concentration.Conclusions : Single dose data can reliably predict the pharmacokinetics of alosetron after repeated doses. Alosetron exhibits limited potential for inhibition of cytochrome P450-mediated metabolism. Interindividual differences in alosetron pharmacokinetics associated with demographic factors may be related to strong dependence on metabolism by CYP1A2.
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    Oxford BSL : Blackwell Science
    Alimentary pharmacology & therapeutics 11 (1997), S. 0 
    ISSN: 1365-2036
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Background: Ranitidine hydrochloride (Zantac) is one of the most extensively studied and widely used drugs of all time. This has provided an excellent opportunity to define its safety profile. Methods: Data from 189 controlled clinical trials in which more than 26000 patients received daily doses of ranitidine for 4 weeks or more were reviewed. More than 80% of patients were treated with up to 300 mg ranitidine daily; the remaining patients received doses of up to 1200 mg daily. Eighty-seven trials were placebo controlled. Analyses of post-marketing surveillance and a database of all spontaneously reported adverse events were also evaluated. Results: Overall in the clinical trial programme adverse events were reported by 20% of those receiving ranitidine compared with 27% of those receiving placebo. The pattern of events was similar in all treatment groups with no evidence of dose-related toxicity in regimens encompassing an eightfold range of therapeutic doses. Similarly in a programme of studies designed to evaluate a dose of ranitidine of 75  mg for non-prescription (over-the-counter) use in the treatment of heartburn, ranitidine was not associated with an adverse event profile distinct from that of placebo. Analysis of spontaneously reported adverse event data allowed identification of rare idiosyncratic events. Conclusions: Review of data from a large population of controlled clinical trials with analyses of postmarketing surveillance studies and spontaneously reported adverse events confirmed the excellent safety profile of ranitidine.
    Materialart: Digitale Medien
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  • 7
    ISSN: 1434-601X
    Schlagwort(e): PACS. 25.80.Ls Pion inclusive scettering and absorption
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: The absorption of π+ on Ar was studied at pion energies of 70, 118, 162, 239 and 330MeV, and on N and Xe at 239MeV. Twenty-six absorption reaction channels with at least two energetic charged particles in the final state have been evaluated. Partial cross-sections have been determined according to the number of protons, neutrons and deuterons in the final state.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 279 (1973), S. 9-18 
    ISSN: 1432-1912
    Schlagwort(e): Aldosterone Antagonists ; β-Methyl-Digoxin ; Guinea Pigs ; Potassium ; Cardiac Toxicity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The effects of aldosterone antagonists on the cardiotoxicity of β-methyl-digoxin in guinea pigs were investigated in vivo and in vitro. 1. Three days of pretreatment with spironolactone influenced neither plasma concentrations, urinary output and tissue distribution of radioactivity after intravenous injection of β-methyl-digoxin nor the pattern of lipid soluble metabolites in the urine. 2. Spironolactone injected intraduodenally 1 h before the infusion of β-methyl-digoxin decreased the cardiotoxicity of the latter if hypokalemia was reduced or prevented by giving 0.4–1.0 mEq/kg KCl 1 h before β-methyl-digoxin. 3. Three days of pretreatment with canrenoate-K decreased the cardiotoxicity of β-methyl-digoxin in vivo without the administration of KCl. 4. Isolated hearts from guinea pigs pretreated with canrenoate-K for 3 days tolerated the perfusion with toxic concentrations of β-methyl-digoxin better than those from controls although the rate of potassium extrusion from the heart was not decreased. 5. The addition of canrenone to the fluid perfusing isolated hearts decreased the potassium extrusion produced by and the toxicity of β-methyl-digoxin. The results suggest that the decreased glycoside toxicity is due to the stimulation of inward transport of potassium by aldosterone-antagonists described in the preceding paper.
    Materialart: Digitale Medien
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  • 9
    Digitale Medien
    Digitale Medien
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 282 (1974), S. 9-14 
    ISSN: 1432-1912
    Schlagwort(e): Cardiac Glycosides ; Distribution ; Guinea Pigs ; Protein Binding ; Therapeutic Ratio
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary In guinea pigs under urethane anaesthesia the concentrations of radioactivity in the plasma, the liver and the heart and the protein binding of radioactivity were measured 1 h after the intravenous injection of 0.2 μmoles/kg β-methyldigoxin or digoxin. The distribution coefficients were calculated between the concentrations in the plasma water and the tissues. Apart from a slightly higher distribution coefficient for β-methyl-digoxin than for digoxin between liver and plasma water there was no significant difference between the two glycosides. In guinea pigs under barbital anaesthesia, cardiac failure was produced by additional doses of barbital-Na. Bemegride was given to counteract the effects of barbital on the vasomotor centre. β-Methyl-digoxin and digoxin were infused until cardiac arrest. For each animal the doses were calculated which led to an increase in cardiac performance by 50 g · cm/sec, arrhythmia, ventricular fibrillation or cardiac arrest. The therapeutic range was calculated from the doses producing arrhythmias and those increasing cardiac performance by 50 g · cm/sec (“therapeutic” dose). There was no difference between the “therapeutic” and toxic doses and the therapeutic ratios of β-methyl-digoxin and digoxin.
    Materialart: Digitale Medien
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  • 10
    Digitale Medien
    Digitale Medien
    Springer
    Der Orthopäde 29 (2000), S. 151-157 
    ISSN: 1433-0431
    Schlagwort(e): Schlüsselwörter Bioimplantat • Biomechanik •¶Knorpeldefekt • Knorpelregeneration •¶Mesenchymale Zelldifferenzierung ; Key words Bioimplant • Biomechanics • Cartilage ¶defect • Cartilage repair • Mesenchymal cell differentiation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary Hyaline cartilage is thought to be unable to regenerate. All efforts so far – including autologous chondrocyte cell transplantation – to reconstruct cartilage defects in joints have not been totally convincing. However, mesenchymal cells are able to differentiate into chondrocytes under mechanical pressure conditions. In this study, an open porous resorbable two-layer “bioimplant” was constructed in which mechanical pressure was exerted onto mesenchymal cells when migrated into the open porous structure of the bioimplant. Differentiation of the cells into chondrocytes was thus induced. The bioimplants were implanted into the medial condyles of nine rabbits and left in place for eight or twelve weeks, respectively. In seven of these cases, cartilage formation was found, in contrary to the controls in which only connective tissue and bone had grown into the empty holes. The new bioimplants have proven their effectiveness in cartilage defect repair and might evolve in the future as a new alternative treatment of full thickness defects of joint surfaces.
    Notizen: Zusammenfassung Gelenkknorpel gilt in der Regel als nicht regenerationsfähig. Bis jetzt durchgeführte Versuche zur Wiederherstellung des Gelenkknorpels, inklusive der Knorpelzelltransplantation, zeigten wenig erfolgversprechende Ergebnisse. Jedoch gibt es Hinweise, dass unter Druckbelastung mesenchymale Stammzellen sich in Knorpelzellen differenzieren können. In der vorliegenden Studie wurde ein offenporiges resorbierbares, zweischichtiges „Bioimplantat“ konstruiert, das nach Implantation in einen Knochen-Knorpel-Defekt die physiologischen Druckverhältnisse nachahmt und so eine Differenzierung von mesenchymalen Stammzellen zu hyalinem Knorpel ermöglicht. An 9 Kaninchen wurde dieses Bioimplantat an Knochenknorpeldefekten des Femurkondylus über 2 verschiedene Zeiträume erprobt und mit Leerlochversuchen verglichen. Durch die Bioimplantate gelang es im Gegensatz zu den Leerlochversuchen in 7 von 9 Fällen Bereiche mit hyalinartigem Knorpel zu induzieren. Die Methode scheint einen neuen erfolgsversprechenden Ansatz zur Reparation von Knorpeldefekten darzustellen.
    Materialart: Digitale Medien
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