全文获取类型
收费全文 | 562097篇 |
免费 | 95041篇 |
国内免费 | 29021篇 |
专业分类
耳鼻咽喉 | 8491篇 |
儿科学 | 12069篇 |
妇产科学 | 6518篇 |
基础医学 | 58352篇 |
口腔科学 | 12426篇 |
临床医学 | 85565篇 |
内科学 | 113748篇 |
皮肤病学 | 16993篇 |
神经病学 | 42823篇 |
特种医学 | 20634篇 |
外国民族医学 | 230篇 |
外科学 | 84577篇 |
综合类 | 62845篇 |
现状与发展 | 165篇 |
一般理论 | 56篇 |
预防医学 | 33198篇 |
眼科学 | 14735篇 |
药学 | 43794篇 |
440篇 | |
中国医学 | 23008篇 |
肿瘤学 | 45492篇 |
出版年
2024年 | 1922篇 |
2023年 | 10091篇 |
2022年 | 15954篇 |
2021年 | 22566篇 |
2020年 | 24657篇 |
2019年 | 23967篇 |
2018年 | 27321篇 |
2017年 | 27711篇 |
2016年 | 28339篇 |
2015年 | 33825篇 |
2014年 | 44398篇 |
2013年 | 42802篇 |
2012年 | 34627篇 |
2011年 | 38056篇 |
2010年 | 36167篇 |
2009年 | 32844篇 |
2008年 | 26104篇 |
2007年 | 23195篇 |
2006年 | 25560篇 |
2005年 | 22320篇 |
2004年 | 14407篇 |
2003年 | 12376篇 |
2002年 | 10871篇 |
2001年 | 11869篇 |
2000年 | 11688篇 |
1999年 | 12125篇 |
1998年 | 9283篇 |
1997年 | 9087篇 |
1996年 | 7753篇 |
1995年 | 7344篇 |
1994年 | 5412篇 |
1993年 | 3883篇 |
1992年 | 3993篇 |
1991年 | 3591篇 |
1990年 | 2925篇 |
1989年 | 2756篇 |
1988年 | 2381篇 |
1987年 | 2054篇 |
1986年 | 1802篇 |
1985年 | 1437篇 |
1984年 | 940篇 |
1983年 | 773篇 |
1982年 | 646篇 |
1981年 | 539篇 |
1980年 | 454篇 |
1979年 | 410篇 |
1978年 | 333篇 |
1977年 | 397篇 |
1975年 | 280篇 |
1972年 | 302篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
91.
92.
The association between family affluence and smoking among 15‐year‐old adolescents in 33 European countries,Israel and Canada: the role of national wealth 下载免费PDF全文
93.
94.
95.
96.
Kota Sahara Rin Yamada Takashi Fujiwara Koichi Koizumi Shin‐ichiro Horiguchi Tsunekazu Hishima Tatsuro Yamaguchi 《Digestive endoscopy》2015,27(7):768-771
Idiopathic myointimal hyperplasia of mesenteric veins (IMHMV) is a rare and poorly understood ischemic colitis that occurs in the rectosigmoid colon of predominantly young, previously healthy, male patients. A 76‐year‐old Japanese man presented to our hospital with a 1‐year history of worsening diarrhea, lower abdominal pain, and weight loss (−6 kg). Laboratory evaluation revealed white blood cell count of 13 200/μL, C‐reactive protein level of 2.0 mg/dL (normal range, 0.0–0.3), and negative results for stool culture (including Clostridium difficile). Colonoscopy showed circumferential and edematous narrowing of the sigmoid colon with deep longitude ulceration. Biopsy was done and examination of the specimen demonstrated no specific ischemia. The patient was treated with bowel rest, antibiotics, and i.v. fluids; however, his symptoms worsened. Finally, sigmoidectomy was carried out. Histological examination demonstrated significant myointimal hyperplasia of mesenteric veins leading to thickening and stenosis of the venous lumen. Therefore, the final diagnosis was IMHMV. Three months following sigmoidectomy, he was asymptomatic. 相似文献
97.
98.
99.
Ling Zhang Xue-Jun Shang Hong-Fei Li Yu-Qin Shi Wei Li Maria E Teves Zhi-Qiong Wang Gao-Feng Jiang Shi-Zhen Song Zhi-Bing Zhang 《Asian journal of andrology》2015,17(1):86-93
Mammalian spermatogenesis is a well-organized process of cell development and differentiation. Meiosis expressed gene 1 (MEIG1) plays an essential role in the regulation of spermiogenesis. To explore potential mechanisms of MEIG1''s action, a yeast two-hybrid screen was conducted, and several potential binding partners were identified; one of them was membrane occupation and recognition nexus repeat containing 3 (MORN3). MORN3 mRNA is only abundant in mouse testis. In the testis, Morn3 mRNA is highly expressed in the spermiogenesis stage. Specific anti-MORN3 polyclonal antibody was generated against N-terminus of the full-length MORN3 protein, and MORN3 expression and localization was examined in vitro and in vivo. In transfected Chinese hamster ovary cells, the antibody specifically crossed-reacted the full-length MORN3 protein, and immunofluorescence staining revealed that MORN3 was localized throughout the cytoplasm. Among multiple mouse tissues, about 25 kDa protein, was identified only in the testis. The protein was highly expressed after day 20 of birth. Immunofluorescence staining on mixed testicular cells isolated from adult wild-type mice demonstrated that MORN3 was expressed in the acrosome in germ cells throughout spermiogenesis. The protein was also present in the manchette of elongating spermatids. The total MORN3 expression and acrosome localization were not changed in the Meig 1-deficient mice. However, its expression in manchette was dramatically reduced in the mutant mice. Our studies suggest that MORN3 is another regulator for spermatogenesis, probably together with MEIG1. 相似文献
100.