全文获取类型
收费全文 | 56298篇 |
免费 | 5051篇 |
国内免费 | 3151篇 |
专业分类
耳鼻咽喉 | 859篇 |
儿科学 | 695篇 |
妇产科学 | 619篇 |
基础医学 | 7522篇 |
口腔科学 | 1082篇 |
临床医学 | 6724篇 |
内科学 | 9296篇 |
皮肤病学 | 849篇 |
神经病学 | 3331篇 |
特种医学 | 2792篇 |
外国民族医学 | 22篇 |
外科学 | 6131篇 |
综合类 | 6481篇 |
现状与发展 | 13篇 |
一般理论 | 6篇 |
预防医学 | 3261篇 |
眼科学 | 1306篇 |
药学 | 5736篇 |
43篇 | |
中国医学 | 2517篇 |
肿瘤学 | 5215篇 |
出版年
2024年 | 175篇 |
2023年 | 900篇 |
2022年 | 2219篇 |
2021年 | 3082篇 |
2020年 | 2244篇 |
2019年 | 2055篇 |
2018年 | 2076篇 |
2017年 | 1888篇 |
2016年 | 1870篇 |
2015年 | 2718篇 |
2014年 | 3138篇 |
2013年 | 3062篇 |
2012年 | 4355篇 |
2011年 | 4609篇 |
2010年 | 2860篇 |
2009年 | 2271篇 |
2008年 | 3012篇 |
2007年 | 2945篇 |
2006年 | 2753篇 |
2005年 | 2594篇 |
2004年 | 1912篇 |
2003年 | 1738篇 |
2002年 | 1451篇 |
2001年 | 1148篇 |
2000年 | 1125篇 |
1999年 | 1158篇 |
1998年 | 633篇 |
1997年 | 614篇 |
1996年 | 483篇 |
1995年 | 430篇 |
1994年 | 382篇 |
1993年 | 220篇 |
1992年 | 373篇 |
1991年 | 285篇 |
1990年 | 276篇 |
1989年 | 247篇 |
1988年 | 224篇 |
1987年 | 194篇 |
1986年 | 161篇 |
1985年 | 121篇 |
1984年 | 81篇 |
1983年 | 67篇 |
1982年 | 26篇 |
1981年 | 35篇 |
1980年 | 22篇 |
1979年 | 37篇 |
1978年 | 21篇 |
1977年 | 22篇 |
1976年 | 32篇 |
1974年 | 25篇 |
排序方式: 共有10000条查询结果,搜索用时 8 毫秒
91.
A case of a paraffinoma in the urinary bladder is presented. Plain radiography and intravenous urography showed a low attenuation filling defect in the urinary bladder, and CT demonstrated a lobulated fat-attenuation mass floating in the urinary bladder. 相似文献
92.
93.
94.
Tang De-ji汤德骥 Xu Ying-han徐英含 Dai Di戴迪 Han Yong-jian韩永坚Wang Bi-chang王必瑺 Lang Ya-min郎亚民and Liang Yi梁毅Department of Hematology Pathology ZhejiangMedical University HangzhouZeng Yi曾毅Institute of Virology Chinese Academy of Preventive Medicine Beijing 《中华医学杂志(英文版)》1989,102(11):819-824
Human immunodeficiency virus (HIV) is now considered as the causative agent of acquired immunodeficiency syndrome (AIDS). A high risk of AIDS has been reported among patients with hemophilia who received lyophilized commercial factor VIII and IX concentrates of American origin. At a prevalent survey from September to December 1985, HIV antibodies were found in all four patients with hemophilia treated with the batch number W87307, 955 I.U. of American commercial factor VIII concentrate supplied by Armour Pharmaceutical Company, USA. One of the sero-positive patients developed AIDS-related complex (ARC) and died of cerebral hemorrhage. The other three sero-positive patients had abnormalities in cell-mediated immunity. Of them two developed left lumbosacral radiculopathy and hemorrhagic herpes zoster and one remained well so far. 相似文献
95.
96.
Byung Hoon Han Myung Hwan Park Yong Nam Han Lin Keun Woo 《Archives of pharmacal research》1986,9(1):21-23
Over twelve alkaloids were delected in the roots ofPanax ginseng C.A. Meyer. Among them three alkaloids were isolated and were identified as N9-formylharman, ethyl β-carboline-1-carboxylate and perlolyrine on the basis of spectroscopic studies. 相似文献
97.
The popularization and application of cold storage red blood cells or whole blood at −80 °C of the Rh(D) negative patients in surgical operation 总被引:2,自引:0,他引:2
Summary The efficiency of cold storage red blood cells (CSRBC) or whole blood at −80 °C used in 27 Rh(D) negative patients during
surgical operation was reported. The Rh(D) negative patients received the transfusion of CSRBC or whole blood stored at −80
°C for 180 to 360 days. The changes in the indexes, such as blood TB, DB, K+, Na+, BUN, Cr, urine protein (URPO), UOB, Hb, HCT, serum total protein, relative to hemolytic reaction and blood volume before
and after transfusion were observed. The results showed that after transfusion of CSRBC or whole blood 27 cases were negative
for urine protein and UOB, and the levels of BUN and Cr were normal (P>0.05). Blood TB, DB, Hb, and HCT were increased, while pH, blood K+ and blood Na+ was normal with the difference being not significant before and after operation (P>0.05). Plasma protein was decreased, but there was no significant difference before and after operation (P>0.05). It was suggested that CSRBC or whole blood at −80 °C could be safely infused to the Rh(D) negative patients without
side effects during the surgical operation.
YU Zhongqing, male, born in 1957, Technician in Charge 相似文献
98.
Effects of mild iron-deficiency anemia on children's short-term memory and intelligence quotient 总被引:3,自引:0,他引:3
L Han 《中华预防医学杂志》1988,22(5):290-292
99.
Sonographic findings in 16 cases of Krukenberg tumor from gastric carcinoma were analyzed. The patients' ages ranged from 25 to 52 years (mean 42 years). The tumor involved both ovaries in 14 patients with asymmetrical masses in 9 of 14 cases. Ascites was noted in 15 cases. Echogenicity of the tumor varied from solid to predominantly cystic: solid in 8, mixed in 6, and predominantly cystic in 2 cases. Solid masses tended to be smaller than mixed or cystic masses. The primary gastric carcinoma had been diagnosed before emergence of the tumors in only 7 cases. The findings suggest that in relatively young patients with ovarian mass, particularly bilateral tumors, careful evaluation for gastrointestinal tract involvement should be done. 相似文献
100.
阴道毛滴虫代谢产物体外对精子活力的影响 总被引:1,自引:0,他引:1
目的 :研究阴道毛滴虫代谢产物体外对人精子活力的影响。 方法 :阴道毛滴虫体外培养 ,除去虫体 ,留取培养液 ,稀释成三个浓度 ;将 10例正常生育男性的优化精子分为等体积的 4份 ,组成以下 4组 :A组加入未培养滴虫的空白培养液 ,B ,C ,D组依次加入前述浓度梯度的培养液 (1.2× 10 9/L、6× 10 8/L、1.2× 10 8/L) ,分别于 30s、1、2、4和 6h时采用计算机辅助精子分析系统 (CASA)分析精子运动参数。 结果 :阴道毛滴虫浓度在 6× 10 8/L以上时 ,精子的活率和活力与对照组相比都显著降低 (P <0 .0 5 ) ,并呈浓度依赖性和时间依赖性。 结论 :阴道毛滴虫代谢产物体外能抑制精子活力 ,可能是造成不孕不育的原因之一。 相似文献