Results 91 to 100 of about 28,669 (212)

Molecular mechanisms of cell death induced by matrine in human cholangiocarcinoma Cells [PDF]

open access: yes, 2016
胆管癌是起源于胆管上皮的一种恶性肿瘤,在我国发病率和死亡率逐年上升。而胆管癌细胞抵抗凋亡是导致胆管癌化疗失败的重要原因,所以研发能够诱导胆管癌细胞以不发生凋亡的死亡新途径的化疗药显得十分重要。苦参碱具有多途径、多种机制的抗肿瘤活性,已经证实能够诱导多种肿瘤细胞死亡,但是在胆管癌中的生物学作用和潜在机制却鲜有报道。程序性坏死(necroptosis)是可被调控的程序性细胞死亡,在形态学上具有典型的坏死样形态改变,依赖于受体相互作用蛋白1和3,此外,可被程序性坏死的特异性抑制剂Nec-1所阻断 ...
徐贝贝
core  

Internal physiological drivers of leaf development in trees: Understanding the relationship between non‐structural carbohydrates and leaf phenology

open access: yesFunctional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Plant phenology is crucial for understanding plant growth and climate feedback. It affects canopy structure, surface albedo, and carbon and water fluxes. While the influence of environmental factors on phenology is well‐documented, the role of plant intrinsic factors ...
Yunpeng Luo   +8 more
wiley   +1 more source

羟基喜树碱对人前列腺癌PC-3m细胞凋亡的影响

open access: yesZhongguo shiyan zhenduanxue, 2010
目的观察羟基喜树碱(HCPT)对前列腺癌PC-3m细胞凋亡的影响,初步探讨其作用机制。方法采用四甲基偶氮唑盐(MTT)法、流式细胞仪(FCM)及激光共聚焦显微镜(CLSM)检测细胞增殖与凋亡变化。结果HCPT作用后PC-3m生长明显受抑,且呈时间-浓度依赖性;在FCM及CLSM上可见凋亡率增加。结论HCPT体外能有效抑制前列腺癌细胞株生长;但其作用机制目前尚需进一步研究。
金光虎   +4 more
doaj  

The coordination of dehydration tolerance and avoidance in oaks is mediated by leaf habit across a precipitation gradient

open access: yesFunctional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Forests worldwide are increasingly impacted by drought due to climate change, prompting plants to adapt through dehydration tolerance (DT) and avoidance (DA), two distinct physiological strategies.
Xingyun Liang   +11 more
wiley   +1 more source

抗癌活性肽-S诱导肝癌细胞凋亡及对细胞周期的调控

open access: yesZhongguo shiyan zhenduanxue, 2010
目的探讨抗癌活性肽-S对荷肝癌小鼠肿瘤的抑制作用及其可能机制。方法建立荷肝癌小鼠皮下种植瘤模型,随机分三组,分别给5-Fu,20mg/Kg,抗癌活性肽-S0.4ml/只,对照组给同体积的生理盐水,尾静脉注射,隔日给药连续10天。10天后处死小鼠,计算重量抑瘤率;取瘤组织制备石蜡切片,原位杂交法检测瘤细胞VEGFmRNA表达情况并计算瘤组织微血管密度(MVD),免疫组化法检测瘤组织中Ki67的表达情况;流式细胞仪检测细胞周期及凋亡。结果抗癌活性肽-S具有较好地抑制肝癌细胞增殖生长及血管生成作用 ...
王朝阳   +3 more
doaj  

The Study about Governance Strategy of Village in Scenic Area Based on Community Building: A Case Study of Dongping Mountain Village in Xiamen [PDF]

open access: yes, 2016
近年来,风景名胜区旅游的持续走热带动了周边地区经济的发展,引发了景中村的快速建设,景中村的蔓延对风景名胜区的保护产生了一定的威胁。针对此问题,政府颁布了相关的风景名胜区保护政策,有效管制了部分景中村的蔓延,但同时也约束了部分受到旅游经济影响较弱的“边缘化”景中村的发展。保护政策中关于村庄建设用地审批的限制,引发了人地矛盾,引起劳动人口的流失,导致景中村的衰败和文化的没落。这种强制性的政策直接保护了风景名胜区的土地资源,但也由此引发了景中村治理的新问题,限制了村庄的发展 ...
何雪婷
core  

Climate stability drives multidimensional nestedness of amphibian assemblages in a Chinese sky island system

open access: yesFunctional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract The nested subset pattern (nestedness) has been widely used to explain species distributions in island and fragmented systems. Mountain sky islands serve as critical natural laboratories for understanding the evolutionary consequences of geographic isolation and climate
Caiwen Zhang   +5 more
wiley   +1 more source

The effect and mechanism of IL-1 R II / IL-1 RAcp in Autoimmune Myocarditis [PDF]

open access: yes, 2016
【目的】白介素-1(IL-1)是一种T淋巴细胞激活因子,大量研究报道,在心肌炎急性期表达量明显升高。白介素1受体II型(IL-1RII)可以招募白介素1受体辅助蛋白(IL-1RAcp),从而拮抗IL-1β的作用。本课题目的为评估IL-1RII和IL-1RAcp的重组质粒对大鼠自身免疫性心肌炎(EAM)的作用,并进一步探讨其机制,为心肌炎的临床治疗提供理论基础。 【方法】首先在临床实验中,我们选取厦门市心血管病医院诊断明确的心肌炎住院患者28例,应用bio ...
宋颖
core  

Parental care and bird embryonic metabolism: A comparison between uniparentally incubating Silver‐throated Tits and biparentally incubating Black‐throated Tits

open access: yesFunctional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Studies have shown that organisms may adjust metabolic rates in response to thermal variability, highlighting metabolic plasticity as a key adaptive mechanism. Understanding the extent of metabolic plasticity of an organism is key to predicting its adaptation to climate
Qian Hu   +6 more
wiley   +1 more source

T淋巴细胞在脓毒症发病机制中的作用

open access: yesZhongguo shiyan zhenduanxue, 2019
脓毒症(Sepsis)是宿主对病原体的异常的反应而引起危及生命的器官功能障碍[1]。由于脓毒症的发病机制复杂,虽然人类对脓毒症的认识在不断进步,以抗生素为基础的治疗技术在不断的提高,但全球每年约有1900万新发的脓毒症患者[2],脓毒症的病死率仍高达25%到80%[3]。免疫抑制是脓毒症发病机制中研究最多的机制。T淋巴细胞(T lymphocytes)在脓毒症发病机制中起关键要作用[4]。本文综述T淋巴细胞在脓毒症的发病机制中的作用。
薛秋丽, 董丽华, 刘忠民
doaj  

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