查询词典 stem

Objective To explore the in vitro isolation of β2m(superscript -)/Thy-1(superscript +) bone marrow-derived liver stem cells which bear double features of stem and liver cells from bone marrow stem cells as so to provide suitable donor cells for the treatment of liver diseases by cellular transplant.

目的 尝试从骨髓干细胞中分选出具备干细胞和肝细胞双重特性的β2m/Thy-1骨髓源性肝干细胞亚群，为细胞移植治疗肝病提供合适的供体细胞。

Part three: An experiment study on the repair of peripheral nerve injury by NT-3 gene modified neural stem cells objective To investigate the effective treatment of peripheral nerve injury with NT-3 gene modified neural stem cells, to explore the feasibility of the treatment by means of gene transfection Methods 54 SD rats were divided evenly into 3 groups. The sciatic nerve transected model were made and sutured end to end with epineurium. The neural stem cell without NT-3 gene or with NT-3 gene modified were injected into triceps muscle one time a week, saline injected as control group. The nerve trunks of stomas and triceps muscle were acted as specimen three weeks、six weeks and nine weeks after operation.

最后，为了探讨神经营养素-3基因修饰的神经干细胞对周围神经再生修复的影响，从转基因角度探讨治疗周围神经损伤的有效方法，我们选用54只SD大鼠随机分为3组，造成坐骨神经切断损伤模型，神经外膜端端对位缝合后，于小腿三头肌每周分别注射生理盐水、未被神经营养素-3基因修饰的神经干细胞、及神经营养素-3基因修饰的神经干细胞。

About 4 days post amputation, cells in some areas in the out epidermis and inner parietal peritoneum near the end of the stump are induced by injury to dedifferentiate into stem cells and then proliferate forming stem-cell masses, which then invaginate into the interior dermis. The dermal cells are then induced by those invaginating stem-cell masses to dedifferentiate.

从第4 d起，近创伤处的表皮层和体腔上皮中部分细胞发生了脱分化形成了干细胞，并增殖形成了干细胞团，然后向真皮层内陷，并诱导真皮层组织发生脱分化，最终在残腕体壁的不同部位形成了众多干细胞原基，是进一步再生所需的细胞库。

UV-B radiation induced significant changes in the chemical composition of root, stem, and leaf. Under UV-B radiation, the soluble protein, lignin, and fat contents in leaf, lignin content in root, and cellulose and lignin contents in stem were increased, while the starch content in leaf and the soluble sugar, starch, and fat contents in stem were decreased significantly (P.05), compared with the control.

UV-B辐射处理下根、茎、叶部所检测的大多数化学成分与对照相比均有显著变化：叶片中可溶性蛋白、木质素和脂肪，根中木质素，茎中纤维素、木质素含量在辐射处理下显著高于对照；叶片中淀粉，茎中可溶性糖、淀粉和脂肪含量在辐射处理下显著低于对照(P.05)。

This result reveal that the cell is pancreatic stem cells and pancreatic stem cells do exist in pancreas,It maintains the steady of pancreas by neogenesis and differation. At present,our laboratory can isolate and expand this cell steadily.This study can provide reference for isolation and expansion of pancreatic stem cells.

说明胰腺内存在着多潜能干细胞，本方法分离到胎猪胰腺干细胞，经诱导分化可形成有功能的胰岛样细胞团并释放胰岛素，有望为进一步研究异种胰腺干细胞移植治疗糖尿病提供材料。

The results of this study indicated that L. gmelinii would transform each other at the different age and its transformation rate was 38.9% where the average stem was 50%, and the dominating stem and overtopped stem were all 33.3%.

结果表明，兴安落叶松分级木在不同年龄阶段有相互转换现象，其转换率38.9%，其中，平均木转换率占50%，优势木和被压木转换率均33.3%。

Prop root An adventitious root, arising from one of the lower nodes of the stem close to the soil surface, found at the junction of stem and soil that grows dowm to the ground and gives additional support to the stem, as seen in maize.

支柱根：一种不定根，起源于接近土壤表面的茎上位置较低的节部。向地生长，插入土壤，并对茎提供一定的支撑。如玉米的支柱根很常见。

Results Trunk neural crest stem cells were successfully isolated and cultured. The immuocytochemcal result showed that the cells were nestin-and P75-positive. Trunk neural crest stem cells grew through adhering to chitosan fiber after inoculation. Under an electon microscope, the spindle-shaped trunk neural crest stem cells were proliferated and migrated along the fiber. The cells arranged side by side or linked by heads and tails in processes. The ends of S-100 positive cells were flat and expanded, adhering to the fiber as claw-shaped pseudopodium.

结果 采用神经管植块法培养的神经嵴干细胞，免疫细胞化学染色呈现nestin及P75双阳性，将其接种在壳聚糖纤维支架材料上，可见神经嵴干细胞贴附于壳聚糖纤维上生长；S-100免疫细胞化学染色显示，S-100阳性细胞突起的末端呈扁平状膨大；扫描电镜显示，壳聚糖纤维上的躯干神经嵴干细胞为梭形，呈现"端对端"、"肩并肩"排列，伸出爪形伪足贴附于壳聚糖纤维上。

Based on the data and materials collected from many years investigation over the sample plots in Daemonorops margaritae plantation in Daqingshan, Guangxi Province, this paper established a model for its stem length distribution by choosing three growth equations and using a method of twice curve fitting to describe the rule of length distribution for mother stem and sucker stem.

对广西大青山黄藤人工林固定样地进行调查和收集资料，选择Logistic、Weibull和Richards 3种理论生长方程，采用两次曲线拟合法分别描述母茎长和萌茎长结构规律，旨在建立黄藤人工林茎长分布模型。

This article introduce the history, characters of tumor stem cell, and the relationship with body stem cell, review the meaning of tumor stem cell thory on tumorous cilinic.

本文介绍了肿瘤干细胞的历史、特征以及与成体干细胞的关系，最后对肿瘤干细胞理论在肿瘤临床的意义进行了初步的阐述。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失