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  • 1
    Electronic Resource
    Electronic Resource
    Comparison of biological and demographic parameters forMononychellus progresivus andOligonychus gossypii on cassava: influence of temperature (1995)
    Springer
    Entomologia experimentalis et applicata 75 (1995), S. 119-125 
    Details
    ISSN: 1570-7458
    Keywords: Acaru ; Tetranychidae ; Mononychellus progresivus ; Oligonychus gossypii ; biological ; demographic parameters ; cassava
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of five constant temperatures (16, 22, 26, 31 and 36°C) on biological (survival and duration of developmental stages, fecundity and longevity of females, sex-ratio) and demographic parameters (R o , G, r m and λ) of the two main phytophagous mites that attack cassava in Africa,Mononychellus progresivus Doreste andOligonychus gossypii (Zacher), was studied in the laboratory. Experiments were performed simultaneously on the two mite species reared on the same cassava variety (1M20) under controlled conditions: 70±10% r.h. and 12L∶12D. The lower thermal threshold was 13°C forM. progresivus and 11°C forO. gossypii. Both species developed in the range from 22 to 36°C. The shortest development time was obtained at 31°C for both species; it was 7.2 days forM. progresivus and 8.2 days forO. gossypii. Maximum fecundity of both species was recorded at 26°C with 42.1 eggs forM. progresivus and 36.3 eggs forO. gossypii The highest intrinsic rate of increase (r m ) was obtained at 31°C for both species with 0.289 and 0.214 forM. progresivus andO. gossypii, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02382170
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  • 2
    Electronic Resource
    Electronic Resource
    Changes in plasma glucagon and insulin associated with fasting in sea bass (Dicentrarchus labrax) (1991)
    Springer
    Fish physiology and biochemistry 9 (1991), S. 107-112 
    Details
    ISSN: 1573-5168
    Keywords: fasting ; Dicentrarchus labrax ; insulin ; glucagon ; glucose ; liver ; Muscle ; glycogen ; protein
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Juvenile sea bass (Dicentrarchus labrax) were fasted for 22 days and changes in plasma insulin, glucagon and glucose levels, as well as glycogen and protein content in liver and muscle were analyzed. Glucagon increased initially on the 4th day of fasting. The glucagon/insulin ratio (G/I) increased from a value of 0.11±0.02 (24h of fasting) to 0.21±0.05 (4th day of fasting). Thereafter, both glucagon and insulin levels decreased and remained at low concentrations until the 22nd day of fasting. Plasma glucose levels fell at the beginning of fasting, stabilized between the 4th and 8th day, and gradually declined during the rest of the experiment. There was a body weight loss of 15% and a significant decrease in both the hepatosomatic index and mesenteric fat. The decrease in the percentage of muscle proteins was not significant, while liver glycogen content showed a sharp decline.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02265126
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of fasting and feeding on plasma amino acid levels in brown trout (1997)
    Springer
    Fish physiology and biochemistry 16 (1997), S. 303-309 
    Details
    ISSN: 1573-5168
    Keywords: Salmo trutta ; fasting ; post-feeding ; amino acid ; fish nutrition ; protein metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Plasma amino acid (AA) levels were analysed at various intervals during fasting and after feeding in juvenile brown trout, Salmo trutta. After 3 days of food deprivation, total plasma AAs decreased significantly (–26% vs. control) due to a fall in the most abundant essential AAs (EAA): branched-chain amino acid (BCAA) and Thr, and there was also a decrease in non-essential AA (NEAA) levels, especially Ala and Asn. After 15 days of fasting, BCAA increased, possibly related to muscle protein mobilization. After 50 days of food deprivation, a significant increase in Gln levels (40% vs. 15 days of fasting) and a decrease in BCAA (–25% vs. 15 days of fasting) was noted. Feeding a commercial trout pellet caused a clear and progressive increase in plasma AA levels. Both EAA and NEAA concentrations peaked at 11 h post-feeding (4068 ± 160 and 4261 ± 239 µM NEAA, respectively) with a greater increase in EAA (+62%) than NEAA (40%) with respect to control values. These data show that changes in the plasma AA pool clearly reflect the nutritional state of fish and help us to understand the complex AA metabolism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007759316656
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  • 4
    Electronic Resource
    Electronic Resource
    Intraspecific diversity of the Cassava Green Mite Mononychellus progresivus (Acari: Tetranychidae) using comparisons of mitochondrial and nuclear ribosomal DNA sequences and cross-breeding (1994)
    Springer
    Experimental and applied acarology 18 (1994), S. 351-360 
    Details
    ISSN: 1572-9702
    Keywords: Mononychellus progresivus ; biodiversity ; molecular biology ; genetics ; cassava
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Intraspecific diversity in Cassava Green Mite Mononychellus progresivus Doreste was examined using individuals collected in Benin and the Congo and in Columbia and Brazil. Comparisons were based on mitochondrial and ribosomal DNA sequences and the results of several cross-breeding experiments. Sequence variation was examined in a total of 1139 base pairs (bp) constituting the ITS2 ribosomal DNA (805 bp) and a fragment of the Cytochrome Oxidase I (COI) gene (334 bp). Sequence divergence is low, ranging from 0% to 2.1% for COI and from 0% to 0.4% for ITS2. Inter-strain comparisons have shown that the two African populations appear to be identical. They were similar to the Colombian population while the Brazilian population was clearly different. The data support the hypothesis of a single introduction of the species in the two African populations. Crossing experiments have shown partial hybrid sterility, suggesting a genetic incompatibility consistent with differences detected by sequence data. The results show the usefulness of molecular markers as a tool for determining taxonomic status and dispersion paths in spider mites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00116316
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