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  • 11
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 73 (1951), S. 4990-4990 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 12
    ISSN: 1432-0428
    Keywords: Diabetes mellitus ; characterization ; Mystromys ; South African hamster
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Spontaneous diabetes mellitus has been studied inMystromys albicaudatus (South African hamster) at the University of Missouri, Columbia Medical Center since its original discovery here in 1969. Thus far, characteristics established as part of the diabetic syndrome in this species included hyperglycemia, glucosuria, ketonuria, polyuria, polyphagia and polydipsia with variations in age of onset, degree of severity, and rate of progression. In addition, decreased glucose tolerance has been demonstrated and statistical analyses of data collected indicated that diabetes mellitus inM. albicaudatus has a polygenic, nonsex-linked mode of inheritance. — Histologic findings involving the pancreas, kidneys, and liver were found to be positively correlated to diagnostic parameters as well as to their degree of severity and duration. Pancreatic lesions includedΒ-cell vacuolization, glycogen infiltration, nuclear pyknosis, margination of organelles, andΒ-cell death.
    Type of Medium: Electronic Resource
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  • 13
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary The respiration of both castes ofFormica polyctena (Foerster) during the larval development was investigated manometrically. The distribution of mitochondria and their structure in the fat body cells were measured simultaneously by electron-microscopy to ascertain if caste-specific differences of the intensity of respiration were recognizable by the content of mitochondria. The following results were obtained: At 20°C larvae of sexuals weighing 1 to 5 mg per individual consumed 860–910 μl O2/g/h, which was double the oxygen amount used by larvae of workers weighing up to 1.5 mg per individual. At the end of the larval development this difference disappeared, with values stabilizing at 410–420 μl O2/g/h. The volume density of mitochondria in 8 mg-sexual larvae was 12.2%, and in 60 mg-larvae or 1.9 mg — and 12.5 mg — worker larvae only 8.2–8.6% of the cytoplasm (without nucleus). The numeric density of the mitochondria was calculated as 840 per mm3 in larvae of 8 mg-sexuals, and in those of 60 mg or in 1.9 mg — and 12,5 mg — worker larvae only as 570–625 per mm3. No caste-specific and stage-dependent differences could be found in the size and microstructure of the mitochondria. An increased respiration was associated with a higher numeric and volume density of the mitochondria.
    Notes: Zusammenfassung Die Atmung wurde während der Larvalentwicklung beider Kasten vonFormica polyctena (Foerster) manometrisch untersucht. Parallel dazu wurde nach elektronenoptischer Präparation die Mitochondrienverteilung und Mitochondrienstruktur in Fettkörperzellen ermittelt, um festzustellen, ob kastenspezifische Unterschiede in der Atmungsintensität auch im Mitochondriengehalt zu erkennen sind. Folgende Resultate wurden erhalten: Geschlechtstierlarven von 1–5 mg/Tier verbrauchten mit 860–910 μl O2/g/h bei 24°C mehr als doppelt so viel Sauerstoff wie Arbeiterinlarven bis 1,5 mg/Tier. Am Ende der Larvalentwicklung war dieser Unterschied bei 410–420 μl O2/g/h ausgeglichen. Die CO2-Abgabe verhielt sich ähnlich. Die Volumendichte der Mitochondrien betrug bei 8 mg-Geschlechtstierlarven 12,2%, bei solchen von 60 mg sowie Arbeiterinlarven von 1,9 mg und 12,5 mg nur 8-2-8,6% des Cytoplasmas (ohne Kern). Die numerische Dichte der Mitochondrien betrug bei 8 mg-Geschlechtstierlarven 840/mm3, bei solchen von 60 mg sowie Arbeiterinlarven von 1,9 mg und 12,5 mg nur 570–625/mm3. In der Größe und Feinstruktur der Mitochondrien konnten keine kastenspezifischen und stadiumabhängigen Unterschiede festgestellt werden. Eine erhöhte Atmungstätigkeit war verbunden mit höherer numerischer und Volumendichte der Mitochondrien.
    Type of Medium: Electronic Resource
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  • 14
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 24 (1977), S. 277-278 
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 15
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 32 (1985), S. 86-95 
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary Queens ofF. polyctena kept with workers in small groups under laboratory conditions laid eggs up to four months. The rate of egg deposition depended on the proportion of queen and workers. At a given size of the growing boxes an optimum was reached at about 100 workers per queen. An increase of the protein content of the artificial standard diet did not noticeably influence the rate of oviposition and the size of the eggs. After a vernalization in the laboratory the queens produced eggs of different sizes as they do after hibernation in the forest nests. But queens kept at constant high room temperature during the whole year laid eggs of similar size only. As in nature after experimental vernalization the queens at first produced big, later on smaller eggs similar to the known w- and s-eggs of the queens of this ant species.
    Notes: Zusammenfassung Königinnen vonF. polyctena, die mit Arbeiterinnen im Laboratorium in kleinen Gruppen gehalten wurden, legten bis über vier Monate hinweg Eier ab. Die Ablagerate wurde vom Verhältnis Königin/Arbeiterinnen beeinflußt. Bei vorgegebener Behältergröße erreichte sie ein Optimum bei ca. 100 Arbeiterinnen pro Königin. Eine Erhöhung des Proteingehaltes der künstlichen Standard-Diät beeinflußte die Eiablagerate und die Eigröße nicht merklich. Im Laboratorium eingewinterte legten wie solche im Winter aus Freilandnestern entnommene Königinnen Eier von unterschiedlicher Größe, während ganzjährig bei konstant hohen Raumtemperaturen gehaltene Königinnen Eier einheitlicher Größe produzierten. Auch nach experimenteller Vernalisation wurden zunächst große, später kleinere Eier abgelegt, die als W- und S-Eier betrachtet werden.
    Type of Medium: Electronic Resource
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  • 16
    Electronic Resource
    Electronic Resource
    Springer
    Development genes and evolution 122 (1930), S. 665-666 
    ISSN: 1432-041X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 17
    Electronic Resource
    Electronic Resource
    Springer
    Development genes and evolution 128 (1933), S. 522-563 
    ISSN: 1432-041X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 18
    Electronic Resource
    Electronic Resource
    Springer
    Development genes and evolution 129 (1933), S. 1-44 
    ISSN: 1432-041X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 19
    Electronic Resource
    Electronic Resource
    Springer
    Development genes and evolution 210 (2000), S. 575-578 
    ISSN: 1432-041X
    Keywords: Key words IRG1 ; Ectoderm ; Gastrulation ; Xenopus laevis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract XIRG (for Xenopus IRG) was cloned by screening a cDNA library of UV-ventralized stage 13 Xenopus laevis embryos for specifically ventrally expressed mRNAs. Embryonic XIRG mRNA expression is restricted to non-neural ectoderm at the gastrula and neurula stages. In adult X. laevis, XIRG mRNA can be detected in skin and kidney. Extensive searches in nucleic acid and protein databases revealed homologous sequences in mouse, human and zebrafish. Mouse IRG1 mRNA is expressed in cultured macrophages as a response to bacterial lipopolysaccharide treatment.
    Type of Medium: Electronic Resource
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  • 20
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 45 (1967), S. 634-638 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary A report has been given on a case of a female infant that showed the typical signs ofEdward's syndrome (E trisomy). The analysis of the chromosomes revealed the mosaic of a D and E double trisomy. As the characteristics of the E trisomy overlaps those of the D trisomy to a great extent, the differential diagnosis between these two syndromes is problematical since it is restricted only to the clinical findings. The etiology of this double trisomy that has also been detected in a milder form with the infant's mother is subsequently discussed.
    Notes: Zusammenfassung Es wird über einen weiblichen Säugling berichtet, der die typischen Zeichen des Edwards-Syndroms (E-Trisomie) bot. Die Chromosomenanalyse deckte das Mosaik einer Doppel-Trisomie D und E auf. Da sich die Symptomatik bei der E-Trisomie weitgehend mit der einer D-Trisomie (Pätau u. Mitarb.) überschneidet, ist eine sich nur auf klinische Symptome beschränkende Differentialdiagnose zwischen diesen beiden Syndromen problematisch. Die Ätiologie dieser Doppel-Trisomie, die bereits bei der Mutter des Säuglings in leichterer Form nachweisbar war, wird erörtert.
    Type of Medium: Electronic Resource
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