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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机理。方法采用形态学方法和同位素标记法。显微形态观察经捷安肽素处理后的供试真菌的形态学变化。进一步采用14c同位素标记的特异底物&尿苷二磷酸-(14c)-葡萄糖&示踪,研究捷安肽素对真菌(1,3)-β-d-葡聚糖合成酶活性反应的影响。结果研究神经生长因子在早期人胚神经管发育过程中的定位表达。方法采用免疫细胞化学 abc法染色,研究35天人胚的发育情况。结果在人胚神经管的室管带中,神经元的细胞质和细胞核ngf免疫反应阳性;在中间带,一部分神经元的细胞核ngf免疫反应阳性,另外一部分神经元的细胞核ngf免疫反应阴性,而其突起ngf免疫反应阳性;在边缘带ngf的表达与中间带相似。在神经管的头侧ngf阳性反应较强,神经管的尾侧ngf阳性反应较弱。结论 ngf在人胚神经管免疫反应阳性,表明ngf可能是诱导神经管分化发育的重要信号分子,提示ngf可能在人胚神经管的发育中具有十分重要的作用。神经生长因子;人胚;神经管;发育
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The result s show that the cerium compounds consist of Ce 3/ Ce 4 and Ce 2O 3/ CeO 2 , exist in the form of particles and are excellently dist ributed on the zinc powder subst rate. The capacity-loss of the zinc elect rodes is evidently suppressed while the discharge capacity and cycle life can be markedly improved due to the application of the zinc-based composite powder as negative materials of the silver-zinc bat tery. Especially , discharge capacity of 231. 4 mAh g-1 is still achieved at the 50th cycle for the zinc elect rode using the composite powder .
结果表明:由 Ce 3/ Ce 4和 Ce 2O 3/ CeO 2组成的铈化合物以颗粒形式良好地分散在锌粉基体上,用这种锌基复合粉作为模拟锌银电池的负极材料,其锌电极的容量衰减得到明显抑制,放电容量和循环寿命得到显著提高,尤其是其锌电极在 50周期的放电容量仍可达到 231。
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Tested the volatilization of boron through the acid-alkali neutralization titration, analyzed the influencing factor of boron volatilization, the conclusion showed that the moisture content and heating-up time were important factor; observed the phase splitting by the SEM, the conclusion showed that the phase splitting were all connected state.
通过酸碱中和滴定法测定了硼挥发量,分析了影响硼挥发的因数,结果表明含水量和升温速率是影响硼挥发的重要因数;通过扫描电镜观察了玻璃的分相情况,结果表明其分相类型均为连通状分相。
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The result shows that the mechanical strength and the thermal stability of bonded hybrid magnet are improved markedly with addition of ferrite in Nd-Fe-B powder,whereas its magnetic performance is reduced slightly.And the temperature coefficient of coercivity with zero is obtained in hybrid magnet with 87% ferrite and 13% HDDR Nd-Fe-B.Due to the magnetic dipole field between the differe...
实验结果表明:随着铁氧体磁粉的加入,复合磁体的磁性能虽略有降低,但其力学性能及热稳定性均有大幅度改善,特别是在铁氧体含量为87%时,复合磁体内禀矫顽力温度系数为零;不同磁粉间静磁场的存在,使得复合磁体在铁氧体含量低于70%时,其磁性能大于平均值,而大于70%时则小于平均值。
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The result show that the N elements curbed the transition from anatase phase to rutile phase , Doped-N was in the structure of the TiO2 as the form of Ti-O-N and formed a new bond energy level;N-doped changed the paramagnetic of the characteristics. The paramagnetic resonance spectrum of TiO2 showed anisotropic and showed hyperfine splitting, The Lande factor of Ti3 + combined with the N is 1.956. UV-Vis absorption spectra showed that the photocatalytic ability of photocatalyst TiO2-xNx to expand to the visible region, the sample (3.84wt %) has the highest photo catalytic activity, the adsorption edge extend to 520nm and degradation is 55.54% under the visible light for 1.5h.
研究结果显示,N元素抑制了锐钛矿相向金红石相的转变,阻止了晶粒的长大,掺杂的N元素以O-Ti-N的形式存在于光催化剂结构中,形成了新的能级结构;N掺杂改变了催化剂的顺磁特征,使TiO2的顺磁共振谱线呈现各向异性,发生了超精细分裂,其中g2=1.956,是与N结合的Ti3+的朗德因子;紫外可见光吸收谱表明,催化剂TiO2-xNx的光响应能力拓展到可见光区,光吸收带发生红移;光催化测试结果显示,掺杂量为3.84的TiO2-xNx在可见光区的响应能力最高,吸收波长延伸至520nm,其光催化活性最大,1.5h降解率达到55.54%。
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It introduces China pharmaceutical industry's characters and problems and then analyzes influence factors from the macroscopically, interspaced and microscopically views. Chapter four is the empirical research part in this paper. It introduces the principal of appraisal index and the choosing of the indexes. Then it introduces the building of model and its disposal method in Spss. To get a clear view of principal components analysis the paper analyzes the differentiate and connection between PCA and factor analysis. In this basement, the paper introduces the disposal process and results of the model. The paper then improves the model with entropy right method to eliminate the portrait diversity of data. To validate the model's stability, the paper makes a significance test of the four results.
第四章是本文的实证研究部分,首先介绍了评价指标选取的原则和指标的确定;然后介绍了模型的构建及其在spss中的处理原理,由于主成分分析法不能在spss中直接实现,且其原理和操作都易与因子分析相混淆,所以本节首先分析了主成分分析法和因子分析法的区别和联系,在此基础上描述了怎样在spss的因子分析的基础上利用主成分分析法进行投资价值评价模型的数据处理;然后介绍了模型的数据处理过程和输出结果,随后利用熵权法对模型做了进一步改进,消除了数据间的纵向差异性,并对改进前后的输出结果进行显著性检验,以验证模型的稳定性。
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After the president election of Taiwan in 2004 and the election of Kaohsiung mayor in 2006, the process and the result of it brought about the extensive issues in Taiwan that everyone concern weather the re-counting of votes could change the results of election and what percentage of that might be.
台湾2004年总统大选与2006年高雄市长选举开票后,过程与结果均引起台湾社会广大的争议,大家关心的是重新验票是否真能扭转选举结果,又其翻盘的机率为何?
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Analysis program of nonlinear signals is developed on the basis of this method, which it can separate the vibration signals into multiple eigenfunctions.
其基本核心思想是对信号利用EMD方法求解本征模态函数,并在此基础上对其做希尔伯特变换,以得到时频分析结果。
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In this paper, models are divided into two patterns, fine-grain and coarse-grain, according to the amount of data communication and are employed for the grid computing case studies.
浮点计算机的计算精度是影响数值模式性能的一种因素,在进行并行计算的过程中,更容易对比模式多CPU计算结果和串行的结果,研究其受舍入误差的影响。
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Eurhythmics, a favorite activity of students, is thus used as the main strategy to design teaching activities, with the aim to enhance the ability of improvisation.
研究方法采行动研究法,根据研究者在教学现场所面临的困境:学生普遍缺乏创作的动机,因此,以提升即兴创作能力为目标,运用学生最喜爱的肢体律动为教学策略,设计教学活动行动方案,并且采用实验教学,以行为观察纪录表与统计、即兴创作影音档案及音乐日记作为呈现实验结果的依据,是属於质、量并陈的研究,其研究之结果分述如下
- 推荐网络例句
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Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.
Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。
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I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.
我来只是现在,'歼灭战perfuming自己与胡努特,那麼,他来到和SAT 。
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The shamrock is the symbol of Ireland and of St.
三叶草是爱尔兰和圣特里克节的标志同时它的寓意是带来幸运。3片心形叶子围绕着一根断茎,深绿色。