Results 31 to 40 of about 17,116 (168)

miR-34a在低氧诱导的大鼠肺动脉平滑肌细胞增殖中的作用

open access: yesZhongshan Daxue xuebao. Yixue kexue ban, 2019
【目的】观察miR-34a在低氧诱导的大鼠肺动脉平滑肌细胞增殖中的作用并探讨其可能的机制。【方法】原代分离和培养大鼠肺动脉平滑肌细胞(PASMC),并给予3%低氧处理后,用Real-time PCR法检测miR-34a和Notch1mRNA在大鼠PASMC中的表达;低氧条件下用细胞转染法过表达和抑制miR-34a、沉默Notch1基因的表达后用EDU法观察细胞增殖情况,并用Real-time PCR和Western blot法检测细胞核增殖抗原PCNA的表达。【结果】分离和培养大鼠PASMC并给予3 ...
马兰
doaj  

Principal Physical Study and Burnup Calculation Analysis on Traveling-Wave Reactor [PDF]

open access: yes, 2015
行波堆是快堆的一种,但具有常规快堆所不具备的特点,它是是一种趋近理想状态的先进核能系统,其焚烧策略可以实现一次装料连续运行数十年。本文使用蒙特卡罗计算程序MCNPX(MentoCarloNeutron-PhotonTransportCode)及其内耦合的燃耗计算程序CINDER90为计算工具,对行波堆的物理性质进行了初步研究,并对用于研究的计算工具的计算性能做了初步的探讨。 首先,本文参照泰拉能源原型堆的组件大小对其进行组件的均匀化,通过建立不同燃料棒尺寸,其他堆芯参数都相同的堆芯模型 ...
沈道祥
core  

Changing fish invasion patterns associated with community fish species turnover in 15 Chinese plateau lakes

open access: yesFunctional Ecology, Volume 39, Issue 10, Page 2743-2757, October 2025.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Biological invasions threaten both biodiversity and ecosystem functioning, yet the role of functional and phylogenetic relationships between invaders and the recipient community in invasion success remains controversial.
Songhao Ji   +7 more
wiley   +1 more source

双靶向TRAIL过表达联合辐射对乳腺癌MDA-MB-435细胞增殖和凋亡的影响

open access: yesZhongguo shiyan zhenduanxue, 2013
目的探讨Egr-1和hTERT双靶向介导TRAIL过表达联合辐射对乳腺癌细胞增殖和凋亡的作用,为肿瘤基因-放射治疗提供必要的参考。方法实验分为正常对照组(Control)、CRAd.pEgr-1-TRAIL组、2.0Gy照射组及CRAd.pEgr-1-TRAIL+2.0Gy照射组。病毒感染和X射线照射后,分别采用CCK-8试剂盒和AnnexinⅤ-FITC试剂盒检测细胞增殖和细胞凋亡。结果随着时间延长,各组细胞均表现增殖状态,control和CRAd.pEgr-1-TRAIL组MDA-MB ...
王巍, 陈文庆, 王长青, 徐贵颖
doaj  

Yap Regulates ATF6-Mediated Unfolded Protein Response [PDF]

open access: yes, 2015
Hippo信号通路最早在果蝇里发现,是在进化上高度保守的一条激酶级联的通路,当Hippo通路的缺失会造其下游调控因子Yap或Taz的激活,促进细胞增殖,抑制细胞凋亡,从而导致器官增大和肿瘤产生。此外,大量文献阐述了内质网压力和肿瘤产生具有相关性。本实验室研究表明,Hippo通路的缺失或Yap蛋白的激活会引起内质网应激信号通路的激活和内质网的增大,并通过内质网应激反应导致肝脏器官增大和肿瘤生成。 当Hippo激酶,在高等动物的同源物为Mst1和Mst2激酶的缺失或Yap激活时 ...
蔡亚波
core  

Assessing the Corn Belt as an anthropogenic barrier to migrating landbirds in the United States

open access: yesConservation Biology, Volume 39, Issue 5, October 2025.
Abstract Migrating landbirds adjust their flight and stopover behaviors to efficiently cross inhospitable geographies, such as the Gulf of Mexico and the Sahara Desert. In addition to these natural barriers, birds may increasingly encounter anthropogenic barriers created by large‐scale changes in land use. One such barrier could be the Corn Belt in the
Fengyi Guo   +7 more
wiley   +1 more source

CpG ODN诱导人PBMC增殖的体外实验研究

open access: yesZhongguo shiyan zhenduanxue, 2010
目的研究CpGODN在体外刺激人PBMC的增殖情况。方法分别以肿瘤抗原(Ag)、白细胞介素-2(IL-2)和CpGODN单独或联合刺激正常人和肿瘤患者PBMC,并对其增殖活性进行测定。结果以CpGODN刺激人PBMC组的细胞增殖活性明显高于对照组 ...
李金龙, 耿力, 韩刚, 贾明库
doaj  

A study about the impact of overpression of Oct4 and Sox2 gene on gastric cancer cell biology and oncology characteristics [PDF]

open access: yes, 2015
目的:通过构建过表达干细胞因子Oct4和Sox2的胃癌SGC7901细胞株,研究过表达干细胞因子Oct4和Sox2对SGC7901胃癌细胞干细胞特性、肿瘤学特性、及生物学特性的影响,并探讨Oct4及Sox2在肿瘤细胞中的作用机制。 方法:1.构建携带Sox2基因的重组质粒,慢病毒载体感染SGC7901-OCT4细胞株得到SGC7901-OCT4-SOX2稳转细胞株。2.利用荧光定量PCR、western–bloting检测过表达Oct4及Sox2的胃癌SGC7901细胞中胃癌干细胞标志基因表达情况。3 ...
李文鹏
core  

On the normative roles of biodiversity and naturalness in conservation

open access: yesConservation Biology, Volume 39, Issue 5, October 2025.
Abstract Nature is an opaque concept. Consequently, the term biodiversity conservation has replaced nature conservation in most conservation contexts. We review the conceptual indeterminacies that plague the terms nature and natural but then show that comparable difficulties plague biodiversity.
David Saltz, Shlomo Cohen
wiley   +1 more source

麻雀的消化道在繁殖期间的形态变化及适应意义

open access: yes野生动物学报, 1995
麻雀的消化道在繁殖期总重量、鲜重及干重均高于繁殖前期,分别增加了61.21%、39.42%和32.12%。其中小肠的长度、重量、鲜重及干重也明显增加了4.92%、132.95%、173.74%和128.33%,而胃内含物重量的增加更为显著。表明了鸟类在繁殖期间通过改变消化道的形态以增加对能量的需求,是鸟类保证繁殖成功的生存对策之一.
柳劲松   +4 more
doaj  

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