排序方式： 共有24条查询结果，搜索用时 15 毫秒
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Very FW 《Science (New York, N.Y.)》1913,37(964):949-957
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Very FW 《Science (New York, N.Y.)》1910,31(787):143-144
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Very FW 《Science (New York, N.Y.)》1912,35(888):31-35
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Somatostatins (SS) are a structurally diverse family of peptide hormones that affect various aspects of growth, development and metabolism in vertebrates. Fish have proved to be useful models for understanding the role(s) of SS in the regulation of growth. Organismal growth is inhibited by SS and fish with impaired growth (caused by fasting or premature transfer to seawater of anadromous species) display enhanced SS production and elevated plasma levels of the hormone. Somatostatins modulate growth at the level of the pituitary through the inhibition of growth hormone (GH) synthesis and secretion. There are, however, significant structure-function relationships with regard to GH inhibition. For example, while SS-14 is a potent inhibitor of GH secretion, catfish SS-22 and salmonid SS-25 appear not to have GH secretotropic effects. Somatostatins also have extra-pituitary effects on growth. For example, SS reduce GH binding capacity and inhibit IGF-I mRNA expression in the liver. In addition, SS inhibit insulin, another factor essential to organismal growth. Finally, SS interact with a variety of reproductive and metabolic processes - actions which suggest that SS help modulate energy partitioning among biological processes. 相似文献
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Mohammed Mouradi Mohamed Farissi Abdelaziz Bouizgaren Bouchra Makoudi Ablaa Kabbadj Anne-Aliénor Very 《Arid Land Research and Management》2016,30(2):193-208
The effects of water deficit on growth, nodulation, and several physiological and biochemical processes in six symbiotic combinations involving three Moroccan alfalfa (Medicago sativa L.) populations (Tafilalet1, Adis-Tata and Demnate2), an American Moapa variety and two rhizobial strains (RhL9 and RhL10) were studied. The experiment was conducted under greenhouse conditions. Seedlings were separately inoculated with the suspension of two rhizobial strains and grown under two irrigation regimes: 80% of field capacity (optimal irrigation) and 40% of field capacity (water deficit). The water stress was applied for five weeks and the agro-physiological and biochemical parameters related to water deficit tolerance were assessed. The results showed that the water deficit had significantly reduced the height of the plants, the dry biomass and nodulation. This constraint also negatively affected the relative water content of leaves, the membrane permeability, the stomatal conductance, the maximum quantum yield of photosystem II, the time to reach maximum fluorescence, the total chlorophyll content and the total nitrogen content. Comparison among the tested symbiotic combinations showed that their behaviors were significantly different. Under drought, oasis populations Ad and Ta maintained high PS II efficiency, membrane stability, relative water content, chlorophyll and nitrogen content in comparison to the mountain one Dm2 and the American Moapa variety. These parameters were maintained at adequate levels in the plants inoculated with the rhizobial strain RhL9 that showed a tolerance to water deficit conditions. 相似文献
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FTV Pereira FC Braga KC Burioli JR Kfoury Jr LJ Oliveira PC Papa AF Carvalho CE Ambrósio FW Bazer MA Miglino 《Reproduction in domestic animals》2010,45(5):907-914
The objectives of this investigation were to understand transplacental transport of iron by secreted uteroferrin (UF) and haemophagous areas of water buffalo placenta and clarify the role(s) of blood extravasation at the placental‐maternal interface. Placentomes and interplacentomal region of 51 placentae at various stages of gestation were fixed, processed for light and transmission electron microscopy, histochemistry and immunohistochemistry. Haemophagous areas were present in placentomes collected between 4 and 10 months of pregnancy. Perl’s reaction for ferric iron was negative in placentomes, but positive in endometrial glands. Positive staining for UF indicated areas in which it was being taken up by phagocytosis and/or fluid phase pinocytosis in areolae of the interplacentomal mesenchyme, with little staining in endometrial stroma. Imunohistochemistry detected UF in trophectoderm of haemophagous regions of placentomes and in other parts of the foetal villous tree, but the strongest immunostaining was in the epithelial cells and lumen of uterine glands. Ultrastructural analyses indicated that erythrophagocytosis was occurring and that erythrocytes were present inside cells of the chorion that also contained endocytic vesicles and caveolae. Results of this study indicate that both the haemophagous areas of placentomes and the areolae at the interface between chorion and endometrial glands are important sites for iron transfer from mother to foetal‐placental tissues in buffalo throughout pregnancy. 相似文献
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P Very R Bocquentin G Duvallet 《Revue d'élevage et de médecine vétérinaire des pays tropicaux》1990,43(3):325-329
The double microcentrifugation technique, described by KRATZER and ONDIEK (1989) for the parasitological diagnosis of trypanosomes, has been tested both in the laboratory and in the field. The limits of detection obtained here were not as low as those described in the original experiment, but the sensitivity of this technique for the detection of Trypanosoma brucei, T. congolense and T. vivax was better than the phase contrast buffy coat method. This technique, which is easy to apply in the field, is highly recommended, especially for epidemiological surveys. A protocol and a list of equipment are included. 相似文献
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