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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of toxicology 59 (1987), S. 371-373 
    ISSN: 1432-0738
    Keywords: 141Ce ; Diet ; Reduced absorption ; Immature rats
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The purpose of this work was to evaluate the effect of prolonged (immediate or delayed) administration of dietary additives to suckling rats on the absorption and retention of radioactive cerium in the body. The experiment was performed on 6-day-old suckling rats. According to dietary treatment the animals were divided into thee groups. Each group was artificially fed over 8 h for 6 or 12 days on one of the diets: the first group of animals was fed milk, the second group was given ingredients of rat diet and the third received milk during the first 2 days of the experiment and the ingredients of rat diet afterwards. At the end of the artificial feeding period the pups returned to their mothers and suckled overnight. On the 1st day of the experiment the food was labelled with 141Ce. Whole body radioactivity was determined in a double crystal scintillation counter every 48 h over a 12-day period. Half of the animals from each group were killed 6 days after 141Ce administration and the other half after 12 days. At these intervals retention was determined in the gut, liver, idneys and femur. The early and delayed administration of rat diet ingredients — fish meal, sunflower meal, alfalfa, cane molasses and premix — greatly reduced whole body retention. The early treatment was more efficacious than the delayed one. The reduction was mostly due to decreased gut retention but organ retentions were also lower. The results obtained indicate that by prolonged (immediate or delayed) administration of some dietary means the retention of radioactive cerium in sucklings can be significantly decreased.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0738
    Keywords: 203Hg ; DMPS ; Age ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effectiveness of DMPS (sodium 2,3-dimercaptopropane-1-sulfonate) in reducing inorganic mercury retention was studied in 2-, 6-, and 28-week-old albino rats. 203Hg was administered IP. The chelating agent DMPS was administered by IP injection at a dose of 250 μmol/kg body weight three times, 1 day after 203Hg administration and at 24 h intervals thereafter. The whole body retention determined 1, 2, 3, and 6 days after 203Hg administration showed that DMPS decreased the body retention of mercury in all age groups, being about twice as effective in adult compared to suckling rats. The reduced effectiveness was due to the reduced efficacy of DMPS in reducing kidney retention in young animals. In other organs the effectiveness of DMPS was not age dependent. These and previous results obtained with different chelating agents and other metals indicate that age might be an important factor in chelation therapy in general.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 22 (1976), S. 393-396 
    ISSN: 1432-0827
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Conclusions Our results indicate that both calcium intake and hormonal factors are important for the maintenance of bone structure. These findings might be relevant in setting up standards for calcium requirement.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 208 (1965), S. 1110-1111 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The terminology is that of the 'observed ratio' whoro nz? Sr/Ca of bone /diet values of OR were Sr/Ca of diet determined by short-term double tracer investigations7. The details of this procedure have been described previously5. The rats were of a highly inbred albino strain and were 8-9 weeks of ...
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 7 (1971), S. 299-306 
    ISSN: 1432-0827
    Keywords: Kinetics ; Calcium ; Metabolism ; Lactation ; Strontium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Le taux de dépôt du calcium et l'ampleur du calcium total échangeable sont déterminés chez le rat entre le 12ème et 17ème jour de lactation, après une injection intrapéritonéale unique de47Ca et85Sr. L'activité spécifique du sérum et la rétention des deux isotopes radioactifs dans l'organisme entier et le tibia (diaphyse et épiphyses) sont déterminées. L'analyse des résultats est réalisée à l'aide du modèle cinétique de Bauer à un compartiment unique. C'est ainsi qu'on observe une diminution du taux de dépôt et une augmentation du calcium total échangeable pendant la lactation.
    Abstract: Zusammenfassung Die Geschwindigkeit der Calciumzunahme und die Größe des austauschbaren Calciumpools wurde bei Ratten zwischen dem 12. und 17. Tag der Lactation nach einer einmaligen intraperitonealen Injektion von47Ca und85Sr bestimmt. Die spezifische Aktivität beider radioaktiven Isotopen im Serum und ihre Retention im ganzen Körper und in der Tibia (Schaft und Epiphysen) wurden bestimmt. Das kinetische Modell von Bauer für ein Kompartiment wurde für die Datenanalyse verwendet. Die Resultate zeigen eine Verminderung der Zunahmegeschwindigkeit und eine Erhöhung des austauschbaren Calciumpools bei laktierenden Tieren, verglichen mit unbegatteten Ratten.
    Notes: Abstract The calcium accretion rate and the size of the exchangeable calcium pool was determined in rats between the 12th and 17th day of lactation after a single intraperitoneal injection of47Ca and85Sr. The serum specific activity and the retention of both radioactive isotopes in the whole body and tibia (shaft and ends) was determined. The single compartment kinetic model by Bauer was used for the analysis of data. The results show a decrease in the accretion rate and an increase in the exchangeable calcium pool in lactating rats as compared to unmated animals.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 31 (1975), S. 834-835 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung In den oberen zervikalen Ganglien der Katze verursacht eine Perfusion mit Locke-Lösung mit 0.1 mM Quecksilber Chlorid eine spontane Freisetzung von Acetylcholin. Dieses Phänomen wird vom Standpunkt der bekannten Wirkung anderer Metalionen bei der Freisetzung von Transmittern diskutiert.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 201 (1964), S. 1240-1240 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Pregnant female rats were divided into two groups and radioactive calcium and strontium (45Ca and 85Sr) added to the drinking water immediately after mating. One group was maintained on a diet containing 0.5 g per cent phosphorus and the other on an exactly similar diet except that the phosphorus ...
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Archives of toxicology 33 (1975), S. 169-172 
    ISSN: 1432-0738
    Keywords: Tetracyclines ; Lead Metabolism ; Rats ; Tetracyklin ; Blei-Metabolismus ; Ratten
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Der Effekt der oralen oder parenteralen Vor- oder Nachbehandlung mit Tetracyklin auf den Blei-Metabolismus wurde bei 7 bis 9 Wochen alten weiblichen Albinoratten untersucht. Bei Tieren, welche über 12 Tage verschiedene Dosen von Tetracyklin oral (30–600 mg/kg täglich) bekamen, war die Retention einer oralen Dosis von 203Pb, welche am 4. Tage der Behandlung verabreicht wurde, am Ende des Experimentes die gleiche wie in der Kontrolle. Bei Ratten, welche täglich intraperitoneale Dosen von Tetracyklin (18,8–75 mg/kg) über 12 Tage erhielten, war die Retention einer am 4. Tage der Behandlung intraperitoneal injizierten Dosis von 203Pb am Ende des Versuches gleich hoch oder sogar höher als in der nichtbehandelten Gruppe. Dies deutet offenbar darauf hin, daß Tetracyklin für Vorbeugung oder Behandlung der Bleivergiftung nicht nützlich ist.
    Notes: Abstract The effects of oral, parenteral pretreatment, and posttreatment with tetracyclines on lead metabolism were studied in 7 to 9-week-old female rats. In animals receiving different doses of tetracyclines orally (30 to 600 mg/kg daily) for 12 days the retention of an oral dose of 203Pb applied on the 4th day of the treatment was, at the end of the experiment, the same as in the controls. In animals receiving daily intraperitoneal doses of tetracyclines (18.8 to 75 mg/kg for 12 days) the retention of an intraperitoneal dose of 203Pb applied on the 4th day of the treatment was, at the end of the experiment, the same or higher than in the untreated group. This indicates that tetracyclines are not likely to be useful in the prevention or treatment of lead poisoning.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Archives of toxicology 31 (1974), S. 265-269 
    ISSN: 1432-0738
    Keywords: Rats ; Age ; Sex ; Lead Acetate Toxicity ; Ratten ; Alter ; Geschlecht ; Bleiacetattoxicität
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Toxicität von Bleiacetat wurde bei jungen (3 Wochen alt) und erwachsenen (18 Wochen alt) Ratten beider Geschlechter 8 Tage nach einer einmaligen i.p. Anwendung bestimmt. Die LD50-Werte waren bei erwachsenen Ratten des männlichen Geschlechtes kleiner als bei erwachsenen Ratten des weib-lichen Geschlechtes oder bei jungen beider Geschlechter. Die Retention von Blei-203 im ganzen Körper, die bei einer anderen Rattengruppe des gleichen Alters und Geschlechtes über 8 Tage nach einmaliger i.p. Anwendung bestimmt wurde, war bei jungen größer als bei erwachsenen Tieren. Unsere Ergebnisse zeigen, daß die Toxicität von Bleiacetat bei jungen Tieren im Vergleich mit erwachsenen geringer und beim männlichen Geschlecht erwachsener Ratten höher ist.
    Notes: Abstract The toxicity of lead acetate was determined in young (3-week-old) and adult (18-week-old) rats of both sexes 8 days after a single i.p. injection. The LD50 was lower in adult males than in adult females and both groups of young animals. The whole-body retention of lead-203 determined in other groups of animals of the same age and sex 8 days after i.p. application was higher in young animals than in adults. Our results indicate a lower toxicity of lead acetate in young animals than in adults and a higher toxicity of lead in adult males.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of environmental contamination and toxicology 41 (1988), S. 185-188 
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
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