Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Multiple-locus heterozygosity, mortality, and growth in a cohort of Mytilus edulis (1985)
    Springer
    Marine biology 88 (1985), S. 265-271 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A positive correlation between the degree of individual heterozygosity (H) at five polymorphic enzyme loci and shell length was reported for a cohort of Mytilus edulis L. sampled in September, 1983, two months after settlement (Koehn and Gaffney, 1984). In the present study, the same cohort was resampled four and eight months after settlement in November, 1983, and April, 1984, respectively. Among individuals four months of age, there was a small, but statistically significant, negative correlation between H and shell length. In this sample, heterozygote deficiency in the cohort was less than that of any size group in the September sample. The reversal of the H-size relationship between September and November suggests that differential mortality, particularly among small, homozygous individuals, occurred in this period. For individuals eight months of age, there was no correlation between H and shell length, there was no heterozygote deficiency in the cohort and the average heterozygosity was the same as that of the largest individuals in September. At the youngest age, there was a positive relationship, between H and growth rate; as aging occurred, differential mortality altered the relationship between H and growth rate. viability differences among heterozygosity classes obscured the original effect of H on growth rate. If there is a positive relationship between heterozygosity and size, it can most likely be detected from sampling a large outbreeding population before differential mortality occurs and before energy is allocated to reproduction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392588
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Growth, condition and specific dynamic action in the mussel Mytilus edulis recovering from starvation (1986)
    Springer
    Marine biology 93 (1986), S. 401-409 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Juvenile Mytilus edulis were grown individually in plastic racks in a tidal salt marsh for 72 d in 1984, starved in the laboratory for 130 d, and then fed the alga Isochrysis galbana daily for 64 d. Oxygen consumption was measured at various times during the course of starvation and recovery. The effects of both size (tissue dry weight) and condition (tissue size relative to shell size) on the rate of oxygen consumption during the course of starvation and recovery were analyzed by multiple regression. Weight-specific preprandial rate was inversely correlated with both size and condition. Weight-specific active rate (measured shortly after feeding) was correlated with size but not condition. Relative Scope for Activity was inversely correlated with size and positively correlated with condition. Relative Specific Dynamic Action (RSDA; the integrated physiological and mechanical response to a meal) was initially correlated negatively with size and subsequently positively with condition. Glycogen content was shown to be positively correlated with condition in mussels before starvation and during recovery. During recovery, experimental mussels returned to 90% of their estimated dry weight prior to starvation, and from 53% after starvation. At weekly intervals during recovery, oxygen consumption was measured following a meal until it returned to the preprandial rate. Both pre- and postprandial volumes (μl at STP) of oxygen consumed per hour ( $$\dot V$$ O 2pre and $$\dot V$$ O 2post , respectively) increased significantly during recovery. The postprandial rise in oxygen consumption increased significantly from 15% to 23% of $$\dot V$$ O 2pre . At the end of the recovery period, RSDA [( $$\dot V$$ O 2post − $$\dot V$$ O 2pre )/ $$\dot V$$ O 2pre ] was independent of final dry weight, but was significantly correlated with percent dry weight recovered (r 2=0.44; df=10; P〈0.02). The increase in RSDA may reflect increased utilization of food and its conversion to soma during recovery from starvation, as distinct from mechanical energy expenditure (feeding activity) following a meal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00401108
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Food deprivation during different periods of tadpole (Hyla chrysoscelis) ontogeny affects metamorphic performance differently (1995)
    Springer
    Oecologia 103 (1995), S. 518-522 
    Details
    ISSN: 1432-1939
    Keywords: Tadpole ; Development ; Feeding ; Metamorphosis ; Starvation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Tadpoles in small, ephemeral pools whose duration and food content are unpredictable can potentially encounter substantial variation in diet composition and availability. We compared the effects of 10 days of food deprivation occurring early, midway and late in ontogeny on the metamorphic size and bioenergetic properties of Hyla chrysoscelis tadpoles. Tadpoles fed throughout ontogeny were controls. Metamorphs from tadpoles starved early and midway in ontogeny had the same snout-vent length and dry mass as controls, but the time to metamorphosis was extended by 8 and 19% respectively. Metamorphs of tadpoles starved late in development attained 85% of the length and 55% of the mass of controls, metamorphosed at the same time as controls, and suffered mortality 15 times greater than other treatments, perhaps because they were near the absolute minimum necessary level of energy reserves. There were no significant differences in percent organic matter, percent tissue water, condition index, and protein or glycogen concentrations between any experimental and control treatments. If food deprivation occurred early in development, the tadpoles caught up to the size of controls, but an extended developmental time would increase the risk of predation or habitat loss. If food reductions occur late in development, perhaps magnified by pond desiccation, tadpoles are stimulated to metamorphose at the same time as controls but at a smaller size. The bioenergetic composition of tadpoles at metamorphosis is unaffected by time of food deprivation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00328691
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Verlauf medikamentöser Mydriasis und Miosis unter Stabilisierung der übrigen pupillomotorischen Bedingungen (1965)
    Springer
    Graefe's archive for clinical and experimental ophthalmology 168 (1965), S. 157-174 
    Details
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung Um am Menschen bei einer Prüfung medikamentöser Pupillenveränderungen gesunder Augen die übrigen pupillomotorischen Bedingungen konstant zu halten, wird vor jeder Messung durch Änderung der Umgebungshelligkeit (gewöhnlich erreichbar durch entsprechende Änderung der Kopfhaltung) die Pupillenweite des unbeeinflußten Auges auf den Ausgangswert eingestellt. Mit dieser Methodik wird zunächst der Verlauf der Pupillenweite auf die Mydriatica Mydriaticum „Roche“ ®, Homatropin l %, Mydrial® und Veritol® sowie die Miotica Eserin 1/4 % und Pilocarpin 3% untersucht. An den so gewonnenen Kurven werden die Abschnitte der maximalen Erweiterungs und Verengerungsgeschwindigkeit, die einer isotonischen Kontraktion entsprechen, tangential verlängert und zum Schnitt gebracht. Koordinaten dieses „Tangentenschnittpunktes“ liegen sowohl für die parasympathicolytischen Mydriatica als auch für die parasympathicomimetischen Miotica zeitlich beträchtlich vor der maximalen Mydriasis bzw. Miosis. Bei Mydrial und Veritol hingegen rücken beide Punkte zeitlich sehr nahe. Eine Mischung aus Veritol und Mydriaticum „Roche“ nimmt hierin eine Zwischenstellung ein. Bei einer Verdünnungsreihe von Mydriaticum „Roche“ von 1% bis 1/128 % nimmt die Maximalgeschwindigkeit des Anstiegs mit fortschreitender Verdünnung ab, die erreichte Mydriasis nimmt dagegen bis 1/64 % allmählich von 8,1 auf 6,0 und von 1/64 % bis 1/128 % von 6,0 auf 3,9 mm ab: der Bereich der isotonischen Kontraktion erweist sich also auch gegen Konzentrationsänderungen als besonders empfindlich. Mit abnehmender maximaler Pupillenweite wird auch der Abstand zwischen dieser und dem „Tangentenschnittpunkt“ geringer. Hieraus wird die Vermutung abgeleitet, daß die Mydriasis im Übergang von der isotonischen zur isometrischen Kontraktion gegen eine Art elastischen Widerstand erfolgt, der bei reiner Sympathicusreizung entfällt, weil hier Dilatatorkontraktion und Sphincterdilatation gleichmäßig erfolgen. Dieser „elastische Widerstand“ entfällt aber auch dann, wenn sich die Pupille nur innerhalb der isotonischen Kontraktion erweitert, wie bei den starken Verdünnungen der Mydriaticum Roche. Während in den Einzelversuchen Pilocarpin und Eserin nur geringe Unterschiede im Wirkungsablauf zeigen, entfalten sie eine sehr unterschiedliche Wechselwirkung gegen Mydriatica: Sämtliche Mydriatiea vermögen eine Pilocarpin-Miosis wesentlich leichter zu überwinden und in eine Mydriasis zu überführen als eine Eserin-Miosis; umgekehrt vermag Eserin die Mydriasis sämtlicher Mydriatica wesentlich rascher zu überwinden als Pilocarpin: Eserin selbst wird im Gewebe verankert und vermag von dort aus das körpereigene Acetylcholin zu stabilisieren, welches seinerseits erst mit dem Mydriaticum in Konkurrenz tritt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00411268
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Schichtdickenbestimmung an dünen Edelmetallschichten durch Röntgenfluorescenzanalyse nach einer eichprobenfreien Emissionsmethode (1966)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 222 (1966), S. 178-189 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Röntgenfluorescenzeichkurven für die Schichtdicke dünner Edelmetallschichten werden berechnet. Die Annahme einer von der Schichtdicke unabhängigen konstanten Primärwellenlänge führt zum gleichen Kurventyp wie die Annahme eines polychromatischen Primärspektrums. Daraus wird geschlossen, daß für Elemente hoher Ordnungszahl das von einer Mo-Röhre emittierte Röntgenspektrum durch eine einzige Primärwellenlänge λ p ersetzt werden kann, welche unabhängig von der Schicht-dicke ist. Berechnungsmethoden und Werte für λ p werden angegeben.
    Notes: Summary X-ray fluorescence calibration curves are calculated for film thicknesses of noble metals. The assumption of a constant primary wave-length independent of the film thickness gives the same type of curve as the assumption of a polychromatic primary spectrum. Therefore, it is concluded that—as far as metals with high atomic number are concerned—the spectrum emitted by a molybdenum X-ray tube may be replaced by a single wave-length λp which does not depend on the film thickness. Calculation methods and values of λp are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00501332
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Rearrangements between the operators in the bacteriophage lambda (1985)
    Springer
    Molecular genetics and genomics 201 (1985), S. 107-114 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The left operator mutant λv2s develops poorly during infection as a result of constitutive expression of the left operon. A revertant of λv2s, designated λiri, was found to contain an inversion of the cI region with the inversion endpoints to be within the lambda operators o L and o R. Formation of the inversion is facilitated by a translocation of right operator o R c mutant sequence to the left operator in λv2s. The inversion in λiri positions wild-type o R sequence at o L returning control of the left operon to repression by the lambda cro repressor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397994
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Zur Bestimmung des Bleies auf maassanalytischem Wege (1880)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 19 (1880), S. 306-309 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01340994
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    How to make injection molds, by G. Menges/P. Mohren, Hanser, Munich, 1986, 385 pp. Price: $72.00 (1987)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 25 (1987), S. 305-305 
    Details
    ISSN: 0887-6258
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1987.140250709
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Zur Bestimmung und zur Trennung des Aluminiums (1905)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 44 (1905), S. 710-721 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01321747
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Über die Kondensationsprodukte von Phenylhydroxylamin mit Oxymethylenverbindungen und Carbinolen. I. Oxymethylencampher und Phenylhydroxylamin (1921)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 4 (1921), S. 388-395 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19210040139
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...