objective the aim of this study is to investigate the expression and the distribution of the nerve growth factor during the period of neural tube development of human embryo.method early development of neural tube was studied in human embryos about 35 gestational days by using immunocytochemical abc technique.result there were ngf immuno-positive substances in the cytoplasm and nuclei of neuroepithelial cells in the ventricular zones of neural tube.in the intermediate zone of neural tube,ngf immunoreactivity was detected in the nuclei of some neurons,or the processes of other neurons which contained no ngf-immunoreactive substances in their nuclei;the expression pattern of ngf in the marginal zone of neural tube was similar to that of the intermediate zone.the density of ngf-immunorecative particles was higher on the rostrum side of neural tube than on the caudal side.the ngf immuno-positive cells were also observed among the somites of embryo under the neural tube.conclusion these results suggest that ngf was an important signal molecule to induce neural tube differentiation,and that ngf may play a significant role in regulation of the biological function of neurons in developing neural tube.

目的 研究捷安肽素的抗真菌作用機理激情视频国产一区。方法采用形態(tài)學(xué)方法和同位素標(biāo)記法。顯微形態(tài)觀察經(jīng)捷安肽素處理后的供試真菌的形態(tài)學(xué)變化。進一步采用14c同位素標(biāo)記的特異底物&尿苷二磷酸-（14c）-葡萄糖&示蹤，研究捷安肽素對真菌(1好超碰在线，3)-β-d-葡聚糖合成酶活性反應(yīng)的影響。結(jié)果研究神經(jīng)生長因子在早期人胚神經(jīng)管發(fā)育過程中的定位表達。方法采用免疫細胞化學(xué) abc法染色av网址在线播放，研究35天人胚的發(fā)育情況黄色片视频在线免费观看在线小影院。結(jié)果在人胚神經(jīng)管的室管帶中，神經(jīng)元的細胞質(zhì)和細胞核ngf免疫反應(yīng)陽性日本高清视；在中間帶日韩国产区，一部分神經(jīng)元的細胞核ngf免疫反應(yīng)陽性，另外一部分神經(jīng)元的細胞核ngf免疫反應(yīng)陰性视频毛片，而其突起ngf免疫反應(yīng)陽性亚洲天堂国产制服；在邊緣帶ngf的表達與中間帶相似。在神經(jīng)管的頭側(cè)ngf陽性反應(yīng)較強老乱女中文字幕熟女熟妇，神經(jīng)管的尾側(cè)ngf陽性反應(yīng)較弱国亚洲视频。結(jié)論 ngf在人胚神經(jīng)管免疫反應(yīng)陽性，表明ngf可能是誘導(dǎo)神經(jīng)管分化發(fā)育的重要信號分子男女激情视频日韩欧美，提示ngf可能在人胚神經(jīng)管的發(fā)育中具有十分重要的作用曰本A级毛片永久在线。神經(jīng)生長因子在线视频国产盗摄；人胚午夜性福利免费；神經(jīng)管；發(fā)育

marginal distribution density function：邊緣分布密度函數(shù)

marginal distribution 邊緣分布 | marginal distribution density function 邊緣分布密度函數(shù) | marginal distribution function 邊緣分布函數(shù)