全文获取类型
收费全文 | 19006篇 |
免费 | 1390篇 |
国内免费 | 1260篇 |
专业分类
21656篇 |
出版年
2024年 | 42篇 |
2023年 | 260篇 |
2022年 | 547篇 |
2021年 | 927篇 |
2020年 | 566篇 |
2019年 | 808篇 |
2018年 | 801篇 |
2017年 | 563篇 |
2016年 | 835篇 |
2015年 | 1110篇 |
2014年 | 1354篇 |
2013年 | 1450篇 |
2012年 | 1683篇 |
2011年 | 1524篇 |
2010年 | 969篇 |
2009年 | 938篇 |
2008年 | 1046篇 |
2007年 | 977篇 |
2006年 | 796篇 |
2005年 | 682篇 |
2004年 | 529篇 |
2003年 | 520篇 |
2002年 | 437篇 |
2001年 | 343篇 |
2000年 | 300篇 |
1999年 | 290篇 |
1998年 | 165篇 |
1997年 | 158篇 |
1996年 | 158篇 |
1995年 | 119篇 |
1994年 | 85篇 |
1993年 | 70篇 |
1992年 | 110篇 |
1991年 | 83篇 |
1990年 | 68篇 |
1989年 | 52篇 |
1988年 | 43篇 |
1987年 | 43篇 |
1986年 | 38篇 |
1985年 | 51篇 |
1984年 | 8篇 |
1983年 | 17篇 |
1982年 | 9篇 |
1981年 | 11篇 |
1980年 | 7篇 |
1979年 | 7篇 |
1978年 | 6篇 |
1977年 | 5篇 |
1974年 | 5篇 |
1969年 | 11篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
993.
994.
Long noncoding RNA H19 participates in metformin-mediated inhibition of gastric cancer cell invasion
Peiwen Li Linhao Tong Yongxi Song Jingxu Sun Jinxin Shi Zhonghua Wu Yao Diao Yaming Li Zhenning Wang 《Journal of cellular physiology》2019,234(4):4515-4527
Recent research suggests that the first-line oral antidiabetes drug metformin may prevent gastric cancer progression and improve prognosis. Many studies have also shown that long noncoding RNAs (lncRNAs) play important roles in many biological processes. Therefore, we aimed to explore whether lncRNAs participate in the mechanisms by which metformin affects gastric cancer cells. In the current study, we found that metformin significantly inhibited the cellular functions of gastric cancer cells through Cell Counting Kit-8 and invasion assays. We found that lncRNA H19 was greatly downregulated in gastric cancer cells treated with metformin using lncRNA microassays. Based on bioinformatics analyses of the Oncomine and The Cancer Genome Atlas databases, H19 is shown to be overexpressed in gastric cancer tissues, with increased expression of H19 relating to advanced pathological tumor stage and pathological tumor node metastasis stage, indicating that H19 may be associated with the invasive ability of gastric cancer. We knocked down H19 in AGS and SGC7901 cell lines and found that knocked-down H19 could decrease gastric cancer cell invasion and that metformin could not further decrease invasion after the knock down. Moreover, H19 depletion increased AMPK activation and decreased MMP9 expression, and metformin could not further activate AMPK or decrease MMP9 in H19 knocked-down gastric cancer cells. In summary, metformin has a profound antitumor effect on gastric cancer cells, and H19 is a key component in the process of metformin suppressing gastric cancer cell invasion. 相似文献
995.
996.
Fangsheng Fu Siyuan Shao Ziyi Wang Fangming Song Xixi Lin Jiaxin Ding Chen Li Zuoxing Wu Kai Li Yu Xiao Yiji Su Jinmin Zhao Qian Liu Jiake Xu 《Journal of cellular physiology》2019,234(7):11951-11959
Osteoporosis, arthritis, Peget's disease, bone tumor, periprosthetic joint infection, and periprosthetic loosening have a common characteristic of osteolysis, which is characterized by the enhanced osteoclastic bone resorptive function. At present, the treatment target of these diseases is to interfere with osteoclastic formation and function. Scutellarein (Scu), a flavonoids compound, can inhibit the progress of tumor and inflammation. However, the role of Scu in inflammatory osteolysis isn’t elucidated clearly. Our study showed that Scu inhibited bone destruction induced by LPS in vivo and OC morphology and function induced by RANKL in vitro. Mechanistic studies revealed that Scu suppressed osteoclastic marker gene expression by RANKL-induced, such as Ctsk9, Mmp9, Acp5, and Atp6v0d2. In addition, we found that the inhibition effects of osteoclastogenesis and bone resorption function of Scu were mediated via attenuating NF-κB and NFAT signaling pathways. In conclusion, the results showed that Scu may become a potential new drug for the treatment of inflammatory osteolysis. 相似文献
997.
Chengchuang Song Zhaoxin Yang Dong Dong Jiawei Xu Jian Wang Hui Li Yongzhen Huang Xianyong Lan Chuzhao Lei Yun Ma Hong Chen 《Journal of cellular physiology》2019,234(6):9839-9848
MicroRNAs (miRNAs) have been established to regulate skeletal muscle development in mammals. However, few studies have been conducted on the regulation of proliferation and differentiation of bovine myoblast cells by miRNAs. The aim of our study was to explore the function of miR-483 in cell proliferation and differentiation of bovine myoblast. Here, we found that miR-483 declined in both proliferation and differentiation stages of bovine myoblast cells. During the proliferation phase, the overexpression of miR-483 downregulated the cell cycle–associated genes cyclin-dependent kinase 2 (CDK2), proliferating cell nuclear antigen (PCNA) messenger RNA (mRNA), and the protein levels. At the cellular level, cell cycle, cell counting kit-8, and 5-ethynyl-2´-deoxyuridine results indicated that the overexpression of miR-483 block cell proliferation. During differentiation, the overexpression of miR-483 led to a decrease in the levels of the myogenic marker genes MyoD1 and MyoG mRNA and protein. Furthermore, the immunofluorescence analysis results showed that the number of MyHC-positive myotubes was reduced. In contrast, the opposite experimental results were obtained concerning both proliferation and differentiation after the inhibition of miR-483. Mechanistically, we demonstrated that miR-483 target insulin-like growth factor 1 (IGF1) and downregulated the expression of key proteins in the PI3K/AKT signaling pathway. Altogether, our findings indicate that miR-483 acts as a negative regulator of bovine myoblast cell proliferation and differentiation. 相似文献
998.
Guang-Cai Li Xu-Ling Qin Huai-Hua Song Ying-Ni Li Yu-Yan Qiu Shi-Chang Cui Yong-Sheng Wang Hui Wang Jun-Ling Gong 《Journal of cellular physiology》2019,234(12):22331-22342
Ovarian cancer characterizes as the fourth leading consequence of death associated with cancer for women. Accumulating evidence underscores the vital roles of microRNAs (miRNAs) in preventing ovarian cancer development. Besides, induction of the phosphatidylinositol-3 kinase/serine/threonine kinase (PI3K/Akt) pathway associated with the ovarian cancer cell migration and invasion. The study aims to examine the effects of miR-15b on the proliferation, apoptosis, and senescence of human ovarian cancer cells by binding to lysophosphatidic acid receptor 3 (LPAR3) with the involvement of the PI3K/Akt pathway. The positive expression of LPAR3 protein was detected by immunohistochemistry. Then the interaction between miR-15b and LPAR3 was examined. The possible role of miR-15b in ovarian cancer was explored using gain- and loss-of-function experiments. Subsequently, the functions of miR-15b on PI3K/Akt pathway, proliferation, migration, invasion, senescence and apoptosis of ovarian cancer cells were assessed. Furthermore, in vivo tumorigenicity assay in nude mice was performed. LPAR3 was overexpressed, whereas miR-15b was poorly expressed in ovarian cancer tissues. LPAR3 is a direct target of miR-15b. Restored miR-15b promoted Bax expression, apoptosis, and senescence, inhibited expression of LPAR3 and Bcl-2, the extent of PI3K and Akt phosphorylation, as well as ovarian cancer cell proliferation, migration, and invasion. Further, tumor growth was observed to be prevented by miR-15b overexpression. Collectively, our study demonstrates that miR-15b represses the proliferation and drives the senescence and apoptosis of ovarian cancer cells through the suppression of LPAR3 and the PI3K/Akt pathway, highlighting an antitumorigenic role of miR-15b. 相似文献
999.
1000.