全文获取类型
收费全文 | 11474篇 |
免费 | 926篇 |
国内免费 | 746篇 |
专业分类
13146篇 |
出版年
2024年 | 20篇 |
2023年 | 212篇 |
2022年 | 393篇 |
2021年 | 631篇 |
2020年 | 395篇 |
2019年 | 513篇 |
2018年 | 536篇 |
2017年 | 344篇 |
2016年 | 509篇 |
2015年 | 712篇 |
2014年 | 795篇 |
2013年 | 921篇 |
2012年 | 1073篇 |
2011年 | 930篇 |
2010年 | 578篇 |
2009年 | 499篇 |
2008年 | 538篇 |
2007年 | 495篇 |
2006年 | 430篇 |
2005年 | 365篇 |
2004年 | 305篇 |
2003年 | 228篇 |
2002年 | 188篇 |
2001年 | 207篇 |
2000年 | 173篇 |
1999年 | 182篇 |
1998年 | 111篇 |
1997年 | 131篇 |
1996年 | 106篇 |
1995年 | 91篇 |
1994年 | 93篇 |
1993年 | 49篇 |
1992年 | 75篇 |
1991年 | 55篇 |
1990年 | 46篇 |
1989年 | 47篇 |
1988年 | 40篇 |
1987年 | 29篇 |
1986年 | 22篇 |
1985年 | 24篇 |
1984年 | 12篇 |
1983年 | 10篇 |
1982年 | 5篇 |
1981年 | 6篇 |
1977年 | 2篇 |
1976年 | 3篇 |
1975年 | 2篇 |
1967年 | 2篇 |
1924年 | 1篇 |
1923年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
A subsystem impactor test for pedestrian lower limb injury evaluation has been brought in China New Car Assessment Protocol(CNCAP).Concerning large anthropometr... 相似文献
92.
93.
94.
Yao Zhou Diyin Li Jianhua Luo Aizhong Chen Xingxing Li Zhenrui Pan Li Wan Liuqing He Danyang Li Yanyan Li Min Dong Liang Tao 《Cell research》2021,31(8):935-938
Dear Editor,
Clostridium novyi(C.novyi)is a spore-forming anaerobic bacterium and opportunistic pathogen causing severe infectious diseases in humans and animal... 相似文献
95.
96.
Fei Huang Puiian Wong Jinglan Li Zheng Lv Liangliang Xu Genfu Zhu Mincong He Yiwen Luo 《Journal of cellular and molecular medicine》2022,26(13):3591
Osteoporosis is a bone disease that is caused by disorder of the skeletal microenvironment, and it characterized by a high disability rate and the occurrence of low energy fractures. Studies on osteoporosis and related treatment options have always been hot spots in the field of bone biology. In the past, the understanding of osteoporosis has been rather limited; research has only shown that osteoporosis involves the imbalance of bone resorption and bone formation, and recent studies have not provided cutting‐edge theories of the basic understanding of osteoporosis. Recent studies have shown crosstalk between bone and immune responses. RANKL, an essential factor for osteoclasts (OCs), is associated with the immune system. T helper (Th17)/regulatory T (Treg) cells are two different kinds of T cells that can self‐interact and regulate the differentiation and formation of OCs. Therefore, understanding the correlation between the skeletal and immune systems and further revealing the roles and the cooperation between RANKL and the Th17/Treg balance will help to provide new insights for the treatment of osteoporosis. 相似文献
97.
Zhengquan Yang Chengliang Zhang Guojun Lian Shijie Dong Menghui Song Hengrong Shao Jingmei Wang Tao Zhong Zhenni Luo Shengnan Jin Chunming Ding 《Nucleic acids research》2022,50(13):7560
5′-Adenylated oligonucleotides (AppOligos) are widely used for single-stranded DNA/RNA ligation in next-generation sequencing (NGS) applications such as microRNA (miRNA) profiling. The ligation between an AppOligo adapter and target molecules (such as miRNA) no longer requires ATP, thereby minimizing potential self-ligations and simplifying library preparation procedures. AppOligos can be produced by chemical synthesis or enzymatic modification. However, adenylation via chemical synthesis is inefficient and expensive, while enzymatic modification requires pre-phosphorylated substrate and additional purification. Here we cloned and characterized the Pfu RNA ligase encoded by the PF0353 gene in the hyperthermophilic archaea Pyrococcus furiosus. We further engineered fusion enzymes containing both Pfu RNA ligase and T4 polynucleotide kinase. One fusion enzyme, 8H-AP, was thermostable and can directly catalyze 5′-OH-terminated DNA substrates to adenylated products. The newly discovered Pfu RNA ligase and the engineered fusion enzyme may be useful tools for applications using AppOligos. 相似文献
98.
Ruijun Liu Ruili Liu Zhiyi Guo Jianghao Ren Jia Huang Qingquan Luo Qiang Tan 《Cell death & disease》2022,13(8)
In view of the important roles played by Kinetochore proteins in mitosis, we believed that they may contribute to the development and progression of human cancers, which has been reported recently elsewhere. Kinetochore-associated 1 (KNTC1) participates in the segregation of sister chromatids during mitosis, the effects of which on non-small-cell lung cancer (NSCLC) remain unclear. Here, we sought to identify the biological significance of KNTC1 in NSCLC. KNTC1 protein expression in NSCLC tissues was investigated by immunohistochemistry. Lentivirus delivered short hairpin RNA (shRNA) was utilized to establish KNTC1 silence NSCLC cell lines. The effects of KNTC1 depletion on NSCLC cell proliferation, migration, apoptosis, and tumor formation were analyzed by MTT assay, wound-healing assay, transwell assay, flow cytometry assay, and in nude mouse models in vivo. After KNTC1 reduction, NSCLC cell viability, proliferation, migration, and invasion were restrained. A xenograft tumor model was also provided to demonstrate the inhibited tumorigenesis in NSCLC. In addition, the downstream mechanism analysis indicated that KNTC1 depletion was positively associated with PSMB8. The findings of the present study suggested that KNTC1 may have a pivotal role in mediating NSCLC progression and may act as a novel therapeutic target for NSCLC.Subject terms: Non-small-cell lung cancer, Cell migration 相似文献
99.
100.