根细胞

In short, programmed cell death is shown to be the mechanism involved in lysigenous aerenchyma formation by the phytohormone ethylene.

在缺氧条件下，植物根皮层细胞会死亡解体，致使崩溃细胞的径向胞壁聚集在一起，形成大的空腔。

BACKGROUND: Guided tissues regeneration has been successfully used in the treatment of periodontal diseases by using biocompatible membrane to prevent tooth epithelial cell growing towards root and to facilitate the formation of a certain gap which is favorable for periodontal membrane cells to occupy the surface of the root, thereby to rebuild the peridental structure.

背景：引导组织再生已成功地应用到牙周病的治疗，应用生物相容性膜，依靠其机械屏障作用能阻止牙龈上皮根向生长，并形成一定的间隙以利于牙周膜细胞占据根面，进而重建牙周结构。

The authors sug-gest that the decreased density of BDNF positive products in lamina II on the 3rd and 6th day was related with the degenerationof the nerve fibers and varicosities after section of the adjacent dorsal roots. On the 12th day, the remaining L6 dorsal roots un-derwent collateral sprouting compensatoryly and reestablished functional connection with target neurons.

作者认为3 d、6 d的减少主要与邻近背根节切除后，其神经纤维和膨体溃变有关；12 d时，保留的Ls背根逐渐侧支出芽，且与靶细胞再建功能联系，故脑源性神经营养因子阳性神经纤维和膨体数均趋于恢复。

Their common structure and annual changing pattern of mycorhizae are as follows: Fungi infect and form endomycorrhizal structure with plants throughout the latter's grown period, and hyphae exist in the cortical cells of roots in the following four forms: Coffee-colored or yellow big peloton consisting of twisted hyphae; Dust-colored or yellow big peloton consisting of fragmentary hyphae; Colorless scattered hyphae; Orange or yellow small peloton with blurry hyphae.

发现四种杓兰的的菌根结构及其在一个生长周期中的动态变化有以下共同特征：在其成年生活期的各个时期，都有真菌入侵形成内生菌根结构，菌丝在其根部皮层细胞内有四种存在状态：咖啡色或黄色、菌丝扭结缠绕而成的大菌丝结；灰褐色或黄色、由片断菌丝组成的大菌丝结；无色、零散的菌丝；橘红色和黄色、菌丝形态模糊的小菌丝结。

Root initation may be stimulated by auxin from the shoot, and auxins have been shown to move toward the root eips.

生长素刺激细胞增大，通过抑制侧芽的发育从而维持顶端优势，根的发生可能是通过芽产生的生长素刺激的，而且生长素可以沿着根尖运输。

Medullary slices of neonatal Sprague-Dawley rats, including hypoglossal nerve root and mNRF, were made according to Suzue's method. Simultaneous recordings of the respiratory rhythmic discharge activity in hypoglossal nerve root with suction electrode and the respiratory neuronal discharge in the mNRF with whole cell patch clamp were performed on the brainstem slice in vitro .

仿Suzue方法制作新生大鼠含有舌下神经根及mNRF的离体延髓脑片标本，以吸附电极记录舌下神经根呼吸节律性放电活动(respiratory rhythmic discharge activity， RRDA)作为呼吸活动的指标，采用全细胞膜片钳记录模式在mNRF同步记录呼吸神经元电活动。

Results show that root elongation and the mitotic index of the root tip cells were significantly decreased with the increasing Cd concentration and treatment duration.

结果表明，随着Cd浓度增加和处理时间延长，水稻幼苗根的生长及根尖细胞有丝分裂指数明显降低。

AIM: To analyze the apoptosis and proliferation of HERS (Hertwig's epithelial root sheath) and to evaluate the roles of HERS cells in the development of cementum.

目的：观察牙根发育中上皮根鞘细胞(Hertwig's epithelial root sheath， HERS)断裂后结局和增殖凋亡相关基因的表达，探讨上皮根鞘在牙根发育特别是牙骨质形成中的可能作用。

Exposure to 14℃didnt change the values of Valt and Vcyt in figleaf gourd root systems.

同时，低根温也引起黄瓜根尖更多的细胞死亡，而在黑籽南瓜中未发现此现象。

Kang-Hong Hu, Institute of Molecular and Cellular Anatomy, University of Regensburg, Regensburg D-93053, Germany

胡康洪，德国雷根斯堡大学分子和细胞解剖学研究所德国雷根斯堡 93051

Fancy gold-plated dangling earrings with facetted White Opal crystals.

花式镀金悬垂耳环与facetted白欧泊水晶。

This essay chooses the study aim from biology teachers in middle school in Shi Jiazhuang which tells us that most of the middle school biology teachers in Shi Jiazhuang have the"burnout", lower successfulness, individualize.

本文选取石家庄市初中生物教师作为研究对象，运用问卷调查的方法对石家庄市初中生物教师职业倦怠的现状进行调查，调查结果发现，石家庄市初中生物教师这一群体普遍存在职业倦怠，情感枯竭程度偏高，成就感偏低，去个性化程度最为严重。