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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the World Aquaculture Society 18 (1987), S. 0 
    ISSN: 1749-7345
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Progress in propagation of milkfish has been impeded by the shortage of mature broodstock. This study was a first step toward revealing the environmental cues for the maturation of milkfish. Experiments were carried out during 1978-1985 in an indoor tank (5.2 × 4.8 × 13 m) under photoperiod control and in an outdoor tank (63 × 5.4 × 13 m). In two controlled, long-photoperiod regime experiments, 86 and 83% of the fish matured, the highest percentages yet reported. In these experiments, milkfish matured one month earlier than the normal spawning season, two months after the fish were exposed to the long daylight regime. Only 21% of the fish under a natural photoperiod regime in the outdoor tank matured. Results of the current study suggest that a change and increase in photoperiod are necessary for the onset of maturation.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 29 (1986), S. 0 
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Diets containing 17α-methyltestosterone (17α-MT) were fed to milkfish, Chanos chanos, both during the spawning season (experiment 1) and after (experiment 2). The daily dosage of 17α-MT per kg of body weight was either 25 mg or 12.5 mg in experiment 1, and either 12.5 mg or 6.25 mg in experiment 2. The fish in both experiments were smaller than the minimum mature size previously reported. After 12 weeks of treatment, the treated fish had GSIs that were four times higher than the control fish in both experiments. Histologically, the testes of the control fish had only spermatogonia, in contrast to spermatozoa in the treated fish. However, no male possessed running milt. So 17α-MT induced spermatogenesis but not spermiation in the immature-sized milkfish.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 26 (1985), S. 0 
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Diets containing 17α-Methyl-testosterone were given to grey mullet, Mugil cephalus, during the refractory period in its reproductive cycle at the dosage of 25 mg or 12.5mgkg−1 fish. Fish in experiment I were fed the diet containing methyl-testosterone every day for 55 weeks, and fish in Experiment II were fed the same diet daily for the first 10 weeks, and three times per week for the next 42 weeks. Fish were checked for the presence of sperm weekly or bi-weekly and tested for fertility during the spawning season. Terminal gonad weights and histology were compared with control groups. This study demonstrated that male mullet will mature 3 weeks or less by oral administration of 12.5 mg methyl-testosterone kg−1 fish daily. Fish can then be maintained in mature condition by feeding them methyl-testosterone at 12.5 mg kg−1 three times per week.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Muon inclusive multihadronic final states ine + e − annihilation at $$\langle \sqrt s \rangle $$ =34.6 GeV, collected by the JADE detector at PETRA, have been analysed in terms of the semi-muonic branching ratios and fragmentation functions of heavy quarks. Defining the fragmentation variable, ζ, as $$z = \frac{{\left( {E + p_\parallel } \right)_{hadron} }}{{\left( {E + p} \right)_{quark} }}$$ we find 〈z c 〉=(77±3±5)% and 〈z b 〉=(86±4±5)%. The corresponding semi-muonic branching ratios are measured to be BR(c→μv μ X)=7.8±1.5±2)% and BR (b→μv μ X)=(11.7±1.6±1.5)%. Defining ζ as $$x_E = \frac{{E_{hadron} }}{{E_{beam} }}$$ we observe an expected softening effect in the fragmentation due mainly to gluon emission, but find that this definition leads to semi-muonic branching ratiomeasurements which are strongly affected by uncertainties in the fragmentation process and the WCD calculation.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 38 (1985), S. 49-56 
    ISSN: 1570-7458
    Keywords: Homoptera ; Aphididae ; Myzus persicae ; Solanum tuberosum ; Beta vulgaris ; genetic variability ; host plant adaptation ; preference ; polyphagy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Die Grüne Pfirsichblattlaus Myzus persicae (Sulz.) lebt polyphag an über 400 Pflanzenarten in mehr als 50 Pflanzenfamilien. Ein breites Nahrungsspektrum einer Art ergibt sich jedoch aus der phänotypischen Plastizität des Individuums oder einer Klonlinie und der genetischen Variabilität der Population. Felpopulationen der Grünen Pfirsichblattlaus wurden auf ihre genetische Variabilität bezüglich der Wirtspflanzenanpassung an Rübe und Kartoffel untersucht. Eine Analyse von mehr als 1 000 Klonen, die über die Jahre 1980, 1981 und 1982 im Rheinland gesammelt wurden, lassen eine breite Variabilität in der Wirtspflanzenanpassung der Population erkennen. Beide Merkmale scheinen unabhängig voneinander vererbt zu werden und zeigen keine Beziehung zum Wirtswahlverhalten adult apterer Läuse der entsprechenden Klone. Die Art M. persicae kann daher charakterisiert werden als eine polyphage Insektenart mit einer breiten genetischen Variabilität und einer grossen phänotypischen Plastizität. Eine generelle Differenzierung von Herbivoren in Generalisten und Spezialisten vernachlässigt die genetische Komponente in der komplexen Beziehung zwischen Insekten un ihren Wirtspflanzen.
    Notes: Abstract The green peach aphid, Myzus persicae (Sulz.), is polyphagous on over 400 plant species in more than 50 families. Phenotypic plasticity of individuals and genetic variability in the population presumably contribute to this polyphagy. The genetic variability in field populations of M. persicae was assessed with respect to their adaptation to sugar beets and potatoes. An analysis of more than 1 000 clones, sampled during 1980, 1981 and 1982 from different host plants in the field, revealed a wide genetic variability in host plant adaptation to sugar beets as well as to potatoes. Both traits seem to be inherited independently from each other and do not correlate with clone-specific host plant preference of apterous adults. The aphid M. persicae can be characterized as a polyphagous insect species with a wide, continuously distributed variability and a broad phenotypic plasticity. A general differentiation of herbivorous species into generalists and specialists tends to ignore the genetic component in the complex of insect-plant relationships.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 72 (1985), S. 438-439 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Annals of hematology 57 (1988), S. 97-100 
    ISSN: 1432-0584
    Keywords: Chronic myelogenous leukemia ; Purine metabolism ; Tiazofurin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Antineoplastic activity of tiazofurin (2-β-D-ribofuranosylthiazole-4-carboxamide) is mediated by an anabolite of the drug thiazole-4-carboxamide adenine dinucleotide (TAD), an analog of NAD which inhibits IMP dehydrogenase activity resulting in the depletion of guanylate pools and cell death. Human chronic myelogenous leukemia K 562 cells were found to be sensitive to tiazofurin with an IC50 of 19.2 μM. TAD content in K 562 cells (1.3 nmol/109/h) was in the range found in susceptible murine and human tumor cells. Studies were conducted to relate tiazofurin toxicity with biochemical effects by examining nucleotide pools. Among the nucleotides, only guanylate pools were significantly depleted by the drug. To further study the effect of the drug on the purine nucleotide de novo and salvage biosynthetic pathways, flux of radiolabelled formate and guanine was employed. The results showed that de novo synthesis of guanylates was curtailed primarily by the drug's action without influencing adenylate biosynthesis or salvage of guanine to guanylates. These studies show that K 562 cells are sensitive to selective inhibition of de novo guanylate pathway indicating that human chronic myelogenous leukemia in blast crisis might be a good candidate for Phase II clinical trials with tiazofurin.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Archives of gynecology and obstetrics 243 (1988), S. 187-190 
    ISSN: 1432-0711
    Keywords: Shortened half-life of PGI2 ; Pre-eclampsia ; Haemostatic imbalance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The biological half-life of prostacyclin was short (5.02±2.10 min) in 5 out of 7 patients with pre-eclampsia; in the remaining two patients the half-life was normal at 9.78 and 10.27 min, respectively. Four weeks after delivery, the half-life was 5.83 min in one patient but had returned to normal 10.16±1.77 min) in the other four. In normal pregnancy and healthy nonpregnant females the values were within the normal range. The shortened half-life PGI2 may account for a decreased local availability of biologically active PGI2 with the consequent decrease in placental perfusion, growth retardation and thrombosis which are often seen in pre-eclampsia.
    Type of Medium: Electronic Resource
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  • 10
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    Unknown
    Urbana, etc. : Periodicals Archive Online (PAO)
    American Journal of Psychology. 41 (1929) 95 
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