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  • 1
    Electronic Resource
    Electronic Resource
    Parasitism ofLygus lineolaris eggs onCoronilla varia, solanum tuberosum, and three host weeds in southeastern Québec (1992)
    Springer
    BioControl 37 (1992), S. 515-523 
    Details
    ISSN: 1573-8248
    Keywords: egg parasitoids ; Mymaridae ; Scelionidae ; Miridae ; Lygus lineolaris ; oophage ; parasitoïde ; Lygus lineolaris
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Le parasitisme des œufs deLygus lineolaris par trois espèces deMymaridae, Anaphes iole, Erythmelus miridiphagus etPolynema pratensiphagum et une espèce deScelionidae, Telenomus sp. a été observé à Ste-Anne-de-Bellevue, Québec. Le niveau maximal de parasitisme observé au champ pour chaque espèce a été respectivement de 15,4, 53,8, 70,0 et 16,7%. Les parasitoïdes étaient obtenus d'œufs deL. lineolaris insérés dans des tiges et des branches d'Amaranthus retroflexus, Chenopodium album, Coronilla varia, Rumex obtusifolius etSolanum tuberosum. A. retroflexus etS. tuberosum portaient une population élevée deL. lineolaris et le parasitisme des œufs était suffisamment élevé pour que l'on puisse considérer qu'il constitue un facteur important de limitation des populations de la punaise.
    Notes: Abstract Parasitism ofLygus lineolaris (Palisot de Beauvois) eggs by three species ofMymaridae, Anaphes iole Girault,Erythmelus miridiphagus Dozier andPolynema pratensiphagum Walley and one species ofScelionidae, Telenomus sp., was investigated at Ste-Anne-de-Bellevue, Québec. The maximum level of field parasitism ofL. lineolaris eggs by individual species was 15.4, 53.8, 70.0 and 16,7%, respectively. Parasitoids were retrieved from eggs ofL. lineolaris inserted in stems and branches ofAmaranthus retroflexus L.,Chenopodium album L.,Coronilla varia L.,Rumex obtusifolius L. andSolanum tuberosum L. Amaranthus retroflexus andS. tuberosum sustained a large population ofL. lineolaris and egg parasitism was high enough to consider it as a potential control factor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02372321
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  • 2
    Electronic Resource
    Electronic Resource
    Predatory mirids of the green apple aphidAphis pomi, the two-spotted spider miteTetranychus urticae and the European red mitePanonychus ULMI in apple orchards in Québec (1992)
    Springer
    BioControl 37 (1992), S. 283-292 
    Details
    ISSN: 1573-8248
    Keywords: Predatory mirids ; Miridae ; Aphis pomi ; Tetranychus urticae ; Panonychus ulmi ; Miridae ; Aphis pomi ; Tetranychus urticae ; Panonychus ulmi ; prédateur
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Le niveau de prédation de huit espèces de mirides prédateurs (Hemiptera: Miridae) présents en verger de pommiers au Québec a été établi pour le puceron vert du pommier, le tétranyque à deux points et le tétranyque rouge du pommier. Le taux de consommation journalier a varié de 1–2 pucerons vert du pommier pourHyaliodes vitripennis Say etCampylomma verbasci Meyer à 7–9 pucerons pourDeraeocoris fasciolus Knight etLepidopsallus minisculus Knight.H. vitripennis a consommé significativement plus de tétranyques que les autres espèces de mirides avec 26 et 18 tétranyques à deux points et tétranyques rouge du pommier respectivement. L'utilisation combinée deH. vitripennis etL. minisculus est suggérée pour la lutte biologique contre les tétranyques du pommier.
    Notes: Abstract The incidence of predation of eight species of predacious mirids (Hemiptera: Miridae) present in an apple orchard of Québec on the green apple aphid, two-spotted spider mite and European red mite were investigated. The daily consumption rates varied from 1–2 green apple aphids forHyaliodes vitripennis Say andCampylomma verbasci Meyer to 7–9 aphids forDeraeocoris fasciolus Knight andLepidopsallus minisculus Knight.H. vitripennis consumed significantly more mites than the other mirid species with 26 and 18 mites per day for the two-spotted spider mite and the European red mite respectively. The combined use ofH. vitripennis andL. minisculus is suggested for the control of phytophagous mites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02372429
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  • 3
    Electronic Resource
    Electronic Resource
    Evidence for a direct effect of growth hormone on osteoblasts (1993)
    Springer
    Cell & tissue research 273 (1993), S. 279-286 
    Details
    ISSN: 1432-0878
    Keywords: Osteoblasts ; Growth hormone ; Growth hormone-receptor ; Alkaline phosphatase ; Immunocytology ; Rat (Wistar)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract In order to determine whether growth hormone (GH) exerts a direct effect on osteoblasts, in vitro and in vivo immunocytological studies were carried out on newborn rat calvaria and a clonal osteoblast-like cell line (MC3T3-E1) isolated from newborn mouse calvaria. After exposure to human growth hormone (hGH) or 1,25 dihydroxyvitamin D3 (1,25(OH)2D3), a significant increase in alkaline phosphatase activity was observed in MC3T3-E1 cells. Simultaneous exposure of MC3T3-E1 cells to hGH and 10 nM 1,25(OH)2D3 showed a synergistic effect of the two hormones on this activity. The optimal dose of hGH was 0.1 nM. An immunocytological procedure was performed on ultrathin frozen sections from 7-day-old rat calvaria and MC3T3-E1 cells cultured with hGH. GH-like immunoreactivity was observed in both cases. In calvaria, endogenous GH-like immunoreactivity was localized at the same ultrastructural level (plasma membrane, cytoplasmic and nuclear matrices) as exogenous GH-like immunoreactivity in MC3T3-E1 cells. Following the initial step of binding to the plasma membrane, GH may be internalized in the cytoplasmic matrix and nucleus. In situ hybridization revealed the presence of mRNA coding for GH receptor in calvaria cells. The density of these receptors seemed to be lower in osteoblasts than in hepatocytes. In MC3T3-E1 cells, hGH induced a dose-dependent secretion of insulin-like growth factor 1. In conclusion, these results indicate that GH may act directly on osteoblasts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00312829
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