全文获取类型
收费全文 | 39316篇 |
免费 | 1899篇 |
国内免费 | 167篇 |
专业分类
耳鼻咽喉 | 534篇 |
儿科学 | 718篇 |
妇产科学 | 477篇 |
基础医学 | 4850篇 |
口腔科学 | 1224篇 |
临床医学 | 2667篇 |
内科学 | 9151篇 |
皮肤病学 | 893篇 |
神经病学 | 3629篇 |
特种医学 | 1993篇 |
外国民族医学 | 1篇 |
外科学 | 6117篇 |
综合类 | 146篇 |
一般理论 | 6篇 |
预防医学 | 1180篇 |
眼科学 | 804篇 |
药学 | 2517篇 |
中国医学 | 95篇 |
肿瘤学 | 4380篇 |
出版年
2023年 | 206篇 |
2022年 | 372篇 |
2021年 | 671篇 |
2020年 | 401篇 |
2019年 | 501篇 |
2018年 | 652篇 |
2017年 | 558篇 |
2016年 | 709篇 |
2015年 | 687篇 |
2014年 | 878篇 |
2013年 | 1072篇 |
2012年 | 1804篇 |
2011年 | 1866篇 |
2010年 | 1125篇 |
2009年 | 969篇 |
2008年 | 1670篇 |
2007年 | 1934篇 |
2006年 | 1768篇 |
2005年 | 1707篇 |
2004年 | 1736篇 |
2003年 | 1690篇 |
2002年 | 1689篇 |
2001年 | 1363篇 |
2000年 | 1446篇 |
1999年 | 1335篇 |
1998年 | 529篇 |
1997年 | 416篇 |
1996年 | 413篇 |
1995年 | 336篇 |
1994年 | 359篇 |
1993年 | 310篇 |
1992年 | 1027篇 |
1991年 | 870篇 |
1990年 | 834篇 |
1989年 | 826篇 |
1988年 | 781篇 |
1987年 | 789篇 |
1986年 | 677篇 |
1985年 | 636篇 |
1984年 | 434篇 |
1983年 | 346篇 |
1979年 | 303篇 |
1978年 | 203篇 |
1977年 | 187篇 |
1974年 | 190篇 |
1973年 | 164篇 |
1972年 | 165篇 |
1971年 | 187篇 |
1970年 | 159篇 |
1969年 | 179篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
K Takahashi A Ihaya Y Chiba N Tanikawa R Muraoka 《Kyobu geka. The Japanese journal of thoracic surgery》1990,43(3):236-239
A 34-year-old woman was admitted with an abnormal shadow on a chest X-ray film. Under a preoperative diagnosis of benign bronchogenic cyst, operation was carried out and the tumor was found to be originating from the right main vagal nerve in the mid-superior mediastinum. The vagal nerve was transected to remove the tumor. Pathological diagnosis was a neurinoma. Postoperative complication was chylothorax which was successfully treated with thoracic drainage and intravenous hyperalimentation. 相似文献
32.
H Niinami Y Egoh T Okoshi T Katsumata S Kato H Kobayashi M Nakagawa S Takahashi 《Kyobu geka. The Japanese journal of thoracic surgery》1990,43(12):1004-1007
Aneurysms of the inferior left ventricular wall represent only a small fraction of all aneurysms that have been reported in surgical series. And in comparison to anterior left ventricular aneurysms, a comparatively higher percentage of reported inferior wall aneurysms was classified as false. A 73-year-old male was admitted for acute inferior myocardial infarction. Three weeks after admission, cardiac catheterization was carried out. Coronary arteriography revealed triple vessel disease and left ventriculography showed an aneurysm of the inferior left ventricular wall, whose feature near the mitral annulus was multiple fenestrations. Left ventricular aneurysmectomy and aortocoronary bypass grafting to the left anterior descending artery were simultaneously performed under cardiopulmonary bypass with moderate hypothermia. The pathological feature was a true aneurysm. The postoperative course was uneventful. 相似文献
33.
Hisashi Tanii Norio Taniguchi Hisayoshi Niigawa Takayoshi Hosono Yasumitsu Ikura Sakae Sakamoto Takashi Kudo Tsuyoshi Nishimura Masatoshi Takeda 《Brain research》1996,743(1-2)
The neuroleptic malignant syndrome (NMS) is a life-threatening complication of neuroleptic treatment. To elucidate the pathogenesis of NMS, an animal model has been developed. Experimental rabbits treated with haloperidol (1 mg/kg) by intramuscular injection, were studied for the diagnostic symptoms of increased muscle rigidity, elevated body temperature, and high serum creatine phosphokinase (CPK) level. Administration of haloperidol (1 mg/kg) and atropine (0.4 mg/kg), and exposure to high ambient temperature (35°C) induced a significant increase in electromyographic activity with muscle rigidity similar to that observed in patients with NMS. Such rabbits also showed elevated body temperature and serum CPK value. In addition to the similarity of the signs and symptoms, all parameters measured (muscle rigidity, body temperature, and serum CPK level) were normalized by dantrolene treatment. The effectiveness of dantrolene in the experimental animal partially confirms the validity of this animal model for NMS. This experimental animal model for NMS may be useful to elucidate the pathogenesis of NMS. 相似文献
34.
High-performance liquid chromatography has been used to quantitate benzalkonium chloride (alkylbenzyldimethylammonium chloride) in complex ophthalmic formulations at or below concentration levels of 50 ppm. The method involves a one-step dilution for sample preparation and direct injection; therefore, recovery and/or conversion problems are nonexistent. The assay is quick, specific, reproducible, and simple. This new approach makes routine determinations far simpler than previous methods and is especially useful for product stability studies and quality control procedures. 相似文献
35.
The stability of factor VIII was studied in plasmas from patients on long-term warfarin therapy. The percent residual factor VIII activity (F.VIII:C) after incubation at 37 degrees C for 4 hr was higher in warfarinized patients than in normal subjects; 76.9 +/- 10.8% (mean +/- SD) of the initial F.VIII:C in the patients versus 61.6 +/- 5.8% in normal subjects (p less than 0.001). On the whole, neither protein C nor vitamin K-dependent coagulation factors except factor VII activity (F.VII:C) correlated with the residual F.VIII:C. There was a negative and weak correlation between the residual F.VIII:C at 4 hr and either the initial F.VIII:C or F.VII:C. Another experiment using protein C depleted plasma showed a relatively enhanced stability of F.VIII:C in the protein C deficiency. These results indicate that factor VIII is more stable in warfarinized plasma, and that protein C and vitamin K-dependent coagulation factors are not the sole, main factor responsible for such a phenomenon. 相似文献
36.
37.
Effects of ageing on the total number of muscle fibers and motoneurons of the tibialis anterior and soleus muscles in the rat 总被引:1,自引:0,他引:1
The age-related changes in the total number of muscle fibers and motoneurons of the tibialis anterior and soleus muscles were studied using 10-, 65-, and 135-week-old rats. The number of fast twitch muscle fibers was decreased at age 65 weeks, while the numbers of slow twitch fibers and of alpha motoneurons were decreased only later, at age 135 weeks. Therefore, the degenerative process of muscle fibers differs with the fiber type. 相似文献
38.
39.
N Sadatoh H Hatabu M Takahashi K Imanaka A Sano 《Journal of computer assisted tomography》1987,11(4):742-744
To achieve prolonged breath-holding, oxygen was administered just before dynamic CT and high resolution lung CT. Oxygen administration has proved to be a supportive means to improve the quality of CT studies. 相似文献
40.