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Highly transparent ZnO thin films were deposited at different substrate temperatures by pulsed laser deposition in an oxygen atmosphere.The thin films were characterized by various techniques including X-ray diffraction,scanning electron microscopy,optical absorption,and photoluminescence.We demonstrated that oriented wurtzite ZnO thin films could be deposited at room temperature using a high purity zinc target.Variable temperature photoluminescence revealed new characteristics in the band edge emission.The... 相似文献
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The difficulty of working with the intact brain in vivo has led to the increasing use of nerve cell cultures in neurobiology. However, dissociated cells cannot be unambiguously identified by morphological criteria before the third week in culture, for it is not until then that the basic morphology and size of neurones become stable so that these and other cell types can be easily distinguished. However, cultured neurones can be identified by various cytochemical techniques based on (1) the detection of neurotransmitters or receptors for transmitters, (2) the presence of the Thy 1 antigen and the receptor for tetanus toxin, which are present on the membrane of most neurones, and (3) the presence in neurones of neurone-specific enolase (NSE), a cytoplasmic enzyme, which can only be identified on fixed specimens. Furthermore, other cell types in culture can also be specifically labelled. For instance, antisera to galactocerebroside bind selectively to oligodendrocytes, and antibodies to a neural tumour bind selectively to Schwann cells. We report here the selective interaction of phosphorylcholine-binding myeloma proteins (PC-BMP) with mouse neurones in culture and in suspension. Phosphorylcholine (PC) is found as part of lecithin and sphingomyelin molecules in variable amounts in eukaryotic and prokaryotic membranes, including plasma membranes. 相似文献
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Mori M Benotmane MA Tirone I Hooghe-Peters EL Desaintes C 《Cellular and molecular life sciences : CMLS》2005,62(13):1489-1501
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Prolactin, growth hormone and the immune system in humans 总被引:1,自引:0,他引:1
B. Velkeniers Z. Dogusan F. Naessens R. Hooghe E. L. Hooghe-Peters 《Cellular and molecular life sciences : CMLS》1998,54(10):1102-1108
Prolactin (PRL) and growth hormone (GH) qualify as lymphoid growth and differentiation factors. Yet, long-standing hyper-
or hyposecretion of PRL or GH does not induce any significant alteration of the immune system. Subclinical changes in laboratory
parameters (such as chemotaxis or phagocytosis by granulocytes or macrophages or natural killer cell activity) have been reported
in some of these conditions. The GH-insulin-like growth factor (IGF)-I axis is dysregulated in ageing, in catabolic states
and in critical illness. Immune parameters, such as infection rate, are being monitored during clinical trials with GH or
IGF-I. Hyperprolactinaemia may play an aggravating role in systemic lupus erythematosus, in autoimmune thyroiditis and in
other autoimmune diseases. The patient may benefit from increased alertness about interactions between the endocrine and immune
systems. 相似文献
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从理论上分析了利用时间有限差分法由近场到近场或远场转换的频域和时域两种方法,并选择时域的方法计算在FDTD计算范围内一给定点的电场值,与直接利用FDTD法得到的结果相比较,两者非常一致;最后利用该方法计算了功率变换器FDTD计算范围外一给定点的电磁场时间响应. 相似文献
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