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471.
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The rate of removal of high concentrations of glucose (10 μg/μl haemolymph) from haemolymph of adult male cockroaches, Periplaneta americana, was studied in normal and ligated insects. More than 50% of the injected glucose is removed from the haemolymph of normal insects within 20 min of injection. A period of rapid trehalose synthesis occurs during the initial 10 min following injection of glucose into the haemocoele, and this is succeeded by a period of glycogen synthesis. The results are discussed in terms of earlier observations on ‘stress-induced hypertrehalosemia’ and the possible involvement of a glycogenic agent. 相似文献
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Otmar Reiser 《Journal of Ornithology》1926,74(1):311-314
Ohne Zusammenfassung 相似文献
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Anja-Rose Strohmaier Herbert Spring Eberhard Spiess 《Histochemistry and cell biology》1996,105(3):179-185
Matrigel and collagen G gels were used as models for basement membrane and interstitial space-collagen, respectively, to study the invasive behavior of cells of the human lung tumor cell line EPLC 32M1, which was derived from a squamous cell carcinoma. For three dimensional analysis of the invasive process, cells were seeded onto the gels in a slide chamber and observed with a confocal laser scanning microscope. Optical sectioning in thexy andxz directions and image reconstruction with computer programs allowed us readily to obtain a three-dimensional overview of the invasive process in situ. Both types of gel showed a smooth surface. Matrigel had a granular structure whereas collagen G revealed a fiber-like morphology. The tumor cells showed a matrix-dependent behavior. On Matrigel, within 24 h of incubation, a network of cells appeared on the surface, which developed further within 72 h to interconnected multicellular cords also invading the gel. Tumor cells seeded on collagen G remained individual. They formed pseudopodia and achieved tight contact with the matrix, eventually also invading the gels in a time-dependent manner. Therefore, the composition of the substrate crucially influences the invasion path. 相似文献
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The biosynthesis of 4-hydroxycoumarin by Penicillium jenseni 总被引:1,自引:0,他引:1
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