共查询到20条相似文献，搜索用时 206 毫秒
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介绍了变电站程序化操作的概念以及其优势,提出了实现变电站程序化操作对一次设备和二次设备的要求.以深圳电局1lOkV莲花山程序化变电站为例,总结分析了程序化操作技术实现的方案选择,以及验收、运维管理等方面内容,探讨了程序化操作对提高工作效率,降低运维成本的作用. 相似文献
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<正>当细胞接受到生理或病理信号时,会做出相应的反应从而最大可能地维护生命体的正常功能。细胞死亡是这类反应中的一个,它的调控在个体发育及维护生命个体正常功能上起着很大的作用。因此,细胞死亡的机制是现代生物学的一个研究热点。细胞的死亡可以以不同的方式进行。细胞的死亡方式不同往往会导致不同的生物学效应。厦门大学韩家淮实验室近期的工作发现细胞的死亡方式之间可以转换,而此转换受能量代谢调控的影响。 相似文献
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在对知识工作的结构特征分析基础上,建立知识工作的程序化、规范化——生产率关系模型,指出对于知识工作,程序化和规范化过程并不必然导致最优生产率,知识工作生产率随着其程序化、规范化程度的提高,呈现先上升后下降的趋势。同时,对于不同类型的知识工作,由于其创新性要求以及工作任务的复杂性不同,最优生产率对应的程序化和规范化程度也有所不同,知识含量越低的岗位,其最优生产率对应的程序化、规范化程度越高;知识含量越高的岗位,其最优生产率对应的程序化、规范化程度越低。掌握知识工作的结构性特征规律,努力实现知识工作的程序化和规范化管理的同时,挖掘知识工作中的创新行为。该模型的建立为企业对科学管理与人本管理的选取提供了借鉴,为知识工作生产率研究提供了新的理论研究视角。 相似文献
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2002年诺贝尔生理学或医学奖授予了英国科学家悉尼·布雷内、美国科学家罗伯特·霍维茨和英国科学家约翰·苏尔斯顿,以表彰他们发现了在器官发育和“程序性细胞死亡”过程中的基因规则。那么,“程序性细胞死亡”是怎么一回事?“程序性细胞死亡”是细胞一种生理性、主动性的“自觉自杀行为”,这些细胞死得有规律,犹如秋天片片树叶的凋落,所以这种细胞死亡又称为“细胞凋亡”。我们每个人都是由受精卵发育 相似文献
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The story of the cell commonder, calcium, reaches into all corners of the cell and controls cell proliferation, differentiation, function, and even death. The calcium-driven eukaryotic revolution is one of the great turning points in the life history, happened about two billion years later when it was converted from a dangerous killer that had to be kept out of cell into the cell master which drives the cell. This review article will take the readers to a tour of tissues chosen to best show the calcium’s many faces (proliferator, differentiator, and killer). The reader will first see calcium and its many helpers, such as the calcium-binding signaler protein calmodulin, directing the key events of the cell cycle. Then the tour will move onto the colon to show calcium driving the proliferation of progenitor cells, then the differentiation and ultimately the programmed death of their progeny. Moreover, the reader will learn of the striking disabling and bypassing of calcium-dependent control mechanisms during carcinogenesis. Finally, recommendations should be taken from the underlying mechanisms through which calcium masters the presistance, progression, and even apoptosis of colorectal cancer cells. Thus, this could be of great interest for designing of chemoprevention protocols. 相似文献
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热休克蛋白的研究进展及其应用 总被引：7，自引：0，他引：7
在不利的环境中，各种有机体都有其共同对应的分子反应，即正常基因的表达抑制和一组特殊基因－热休克基因的激活和表达，并导致热休克蛋白的大量产生。热休克蛋白主要作为分了伴侣而参与蛋白的折叠、转运及组装等过程，并能恢复或加速清除细胞内已变性的蛋白质而稳定细胞结构，使细胞产生热耐受。随着对热休克蛋白研究的不断深入，其在生物工程、医学和遗传育种等方面的应用前景十分广阔。 相似文献
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采用细胞的传代培养，从细胞水平探索元极堂内三元场对体外培养细胞ＮＫＭ，Ｗｇ３－ｈ的形态，增殖和衰老死亡的影响，实验结果表明：放在元极深圳内三元场处理的癌细胞存活率随处理时间的延长而下降，死亡率上升，显示元极堂内三元场有促进癌细胞衰亡的作用。 相似文献
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细胞是生物体最基本的结构和功能单元,它蕴含了大自然几千万年进化所沉淀的智能。细胞外膜将细胞内部和细胞环境分割开,控制细胞内外物质的进出,而细胞内膜将细胞内部分成具有不同生物功能的细胞器,这使得细胞自身构成了一个分布式并行信息处理系统。文章介绍了研究细胞计算的背景,细胞的基本结构和功能,以及基于细胞的结构和功能而发展起来的计算机科学新领域:膜计算。膜计算目前主要有3类计算模型:细胞型计算模型、组织型计算模型和神经型计算模型,这3类计算模型分别以单个细胞、细胞群体和神经元作为计算载体。膜计算在生物系统建模等方面具有重要的应用价值。随着生物技术的发展,人们用大肠杆菌等实现了部分膜计算模型。最后,展望了膜计算在生物学、医学、大规模数据存储、大规模并行计算等方面的应用前景。 相似文献
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宫颈鳞状上皮癌变过程中细胞周期调节通路p14^ARF-MDM2-p53作用的研究 总被引：2，自引：0，他引：2
目的 探讨细胞周期调节p14ARF-MDM2-p53通路在宫颈上皮癌变过程中的作用.方法 采用免疫组化SP法检测18例正常宫颈上皮、48例宫颈上皮内瘤变(CIN)和23例宫颈鳞状细胞癌组织p14ARF、MDM2及p53蛋白的表达.结果 p14ARF蛋白表达阳性率在正常宫颈上皮、CIN和宫颈鳞癌组分别为28%、42%和78%,宫颈鳞癌组表达较正常上皮和CIN组升高(P＜0.05);MDM2蛋白表达阳性率在正常宫颈上皮、CIN和宫颈鳞癌组分别为0%、23%和43%,CIN和宫颈鳞癌组较正常宫颈上皮表达升高(P＜0.05);p53蛋白表达阳性率在正常宫颈上皮、CIN和宫颈鳞癌组分别为6%、31%和39%,CIN及宫颈鳞癌组表达水平较正常宫颈上皮升高(P＜0.05);统计分析未发现三种蛋白的表达存在显著相关性.结论 p14ARF-MDM2-p53细胞周期调节通路与宫颈癌发生发展有关并有望用于CIN及宫颈癌的诊断. 相似文献
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The rapid, complete, targeted and safe treatment for tumors remains a key issue in cancer therapy. A novel treatment of solid tumors by supramolecular photocatalyst Nano-SA-TCPP with the irradiation of 600–700 nm wavelength is established. Solid tumors (100 mm3) can be eliminated within 10 min. The 50-day mouse survival rate was increased from 0% to 100% after the photocatalytic therapy. The breakthrough was owing to the cell membrane rupture and the cytoplasmic loss caused by photogenerated holes inside cancer cells. The porphyrin-based photocatalysts can be internalized in a targeted manner by cancer cells due to the size selection effect, without entering the normal cells. The therapy has no toxicity or side effects for normal cells and organisms. Moreover, the photocatalytic therapy is effective for a variety of cancer cell lines. Because of its high efficiency, safety and universality, the photocatalytic therapy provides us with a new lancet to conquer the tumor. 相似文献
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S. Pandey A. Sharma S. Dahia V. Shah V. Sharma R. M. Mishra Sw. Pandey R. Saxena 《Indian journal of clinical biochemistry : IJCB》2012,27(2):191-195
Blood biochemistry has significant effect on pathophysiology of human body. Recently few studies found the association of biochemical abnormalities in sickle cell patients. Sickle cell disease showed clinical variability where African ancestors have severe phenotype than Indian sicklers. Our aim was to evaluate the biochemicals in sickle cell patients and their effect on severity. Here we present the comparative biochemical levels in sickle cell patients as well as controls. Sickle cell patients diagnosed by HPLC and biochemical analysis done by Beckman-auto analyzer. T test applied for statistical analysis. Result showed the renal abnormality lesser in patients and related biochemical within the normal range and statistically not significant. Electrolytes, hepatic enzymes, alkaline phosphatase and glucose were elevated and statistically significant (P value <0.05). Observation of the study concludes the biochemical abnormality play a significant role in sickle cell patient’s physiopathology and can be used to management of the disease. 相似文献
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Neeta Singh 《Indian journal of clinical biochemistry : IJCB》2007,22(2):6-16
Apoptosis a physiological mechanism that eliminates excessive, damaged or unwanted cells, is a highly regulated pathway important
for maintaining homeostasis in multicellular organisms. It can be initiated through various signals via the extrinsic pathway
which involves death receptors, or via the intrinsic pathway which is initiated by intracellular damage and involves the mitochondria
and release of cytochrome c from it to further activate caspases. The Bcl-2 family of proteins is situated upstream to the
irreversible damage of cellular constituents and is an important checkpoint in the fate of a cell. The pro-apoptotic members,
BH3 only members include BID, BAD and BIM. They directly or indirectly activate multidomain BAX/BAK that constitute the requisite
gateway to the intrinsic pathway which operates at the mitochondrial surface and endoplasmic reticulum. In contrast, antiapoptotic
members such as Bcl-2, Bcl-XL bind and sequester activation. Downstream of mitochondria, the apoptosome involvement is seen
to generate caspase activity. Post mitochondria regulation involves IAPs, and their inhibitors. The pathogenesis of several
diseases such as cancer, neurodegenerative disorders, autoimmune disorders, heart disease, infectious diseases including AIDS
is closely related to aberrant apoptosis. Consequently interest has emerged in employing various the rapeutic approaches such
as gene therapy, antisense therapy, recombinant biologicals, organic and combinatorial chemistry, to specifically target apoptosis
signaling pathways such as death receptors FAS/TRAIL, Bcl-2, p53, IAPs, SMAC and caspases, etc. and are now advancing from
preclinical to clinical phase. 相似文献