全文获取类型
收费全文 | 20916篇 |
免费 | 1675篇 |
国内免费 | 97篇 |
专业分类
耳鼻咽喉 | 259篇 |
儿科学 | 599篇 |
妇产科学 | 342篇 |
基础医学 | 2709篇 |
口腔科学 | 291篇 |
临床医学 | 2279篇 |
内科学 | 5282篇 |
皮肤病学 | 280篇 |
神经病学 | 1649篇 |
特种医学 | 810篇 |
外国民族医学 | 1篇 |
外科学 | 3146篇 |
综合类 | 327篇 |
一般理论 | 14篇 |
预防医学 | 1441篇 |
眼科学 | 671篇 |
药学 | 1230篇 |
中国医学 | 50篇 |
肿瘤学 | 1308篇 |
出版年
2023年 | 96篇 |
2022年 | 105篇 |
2021年 | 321篇 |
2020年 | 208篇 |
2019年 | 387篇 |
2018年 | 403篇 |
2017年 | 327篇 |
2016年 | 345篇 |
2015年 | 369篇 |
2014年 | 552篇 |
2013年 | 841篇 |
2012年 | 1192篇 |
2011年 | 1150篇 |
2010年 | 695篇 |
2009年 | 694篇 |
2008年 | 1166篇 |
2007年 | 1256篇 |
2006年 | 1281篇 |
2005年 | 1220篇 |
2004年 | 1164篇 |
2003年 | 1091篇 |
2002年 | 1029篇 |
2001年 | 386篇 |
2000年 | 377篇 |
1999年 | 340篇 |
1998年 | 231篇 |
1997年 | 206篇 |
1996年 | 169篇 |
1995年 | 214篇 |
1994年 | 163篇 |
1993年 | 141篇 |
1992年 | 277篇 |
1991年 | 214篇 |
1990年 | 245篇 |
1989年 | 217篇 |
1988年 | 229篇 |
1987年 | 225篇 |
1986年 | 201篇 |
1985年 | 175篇 |
1984年 | 170篇 |
1983年 | 166篇 |
1982年 | 155篇 |
1981年 | 143篇 |
1980年 | 129篇 |
1979年 | 142篇 |
1978年 | 128篇 |
1977年 | 138篇 |
1976年 | 105篇 |
1974年 | 103篇 |
1973年 | 106篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Dongbing Lai Emma C. Johnson Sarah Colbert Gayathri Pandey Grace Chan Lance Bauer Meredith W. Francis Victor Hesselbrock Chella Kamarajan John Kramer Weipeng Kuang Sally Kuo Samuel Kuperman Yunlong Liu Vivia McCutcheon Zhiping Pang Martin H. Plawecki Marc Schuckit Jay Tischfield Leah Wetherill Yong Zang Howard J. Edenberg Bernice Porjesz Arpana Agrawal Tatiana Foroud 《Alcoholism, clinical and experimental research》2022,46(3):374-383
2.
Anela Stanic Denis Rybin Francis Cannata Carole Hohl Jennifer Brody Jessie Gaeta 《AIDS care》2021,33(1):1-9
ABSTRACT The lack of stable housing can impair access and continuity of care for patients living with human immunodeficiency virus (HIV). This study investigated the relationship between housing status assessed at multiple time points and several core HIV-related outcomes within the same group of HIV patients experiencing homelessness. Patients with consistently stable housing (CSH) during the year were compared to patients who lacked CSH (non-CSH group). The study outcomes included HIV viral load (VL), CD4 counts, and health care utilization. Multivariable and propensity weighted analyses were used to assess outcomes adjusting for potential group differences. Of 208 patients, 88 (42%) had CSH and 120 (58%) were non-CSH. Patients with CSH had significantly higher proportion of VL suppression and higher mean CD4 counts. The frequency of nurse visits in the CSH group was less than a half of that in the non-CSH group. Patients with CSH were less likely to be admitted to the medical respite facility, and if admitted, their length of stay was about a half of that for the non-CSH group. Our study findings show that patients with CSH had significantly better HIV virologic control and immune status as well as improved health care utilization. 相似文献
3.
4.
Dynamic LVOT Obstruction and Aortic Stenosis in the Same Patient: A Case of Challenging Doppler Hemodynamics 下载免费PDF全文
Matthew W. Parker M.D. Francis J. Kiernan M.D. 《Echocardiography (Mount Kisco, N.Y.)》2015,32(6):1030-1032
We present a patient with both dynamic left ventricular outflow tract obstruction and valvular aortic stenosis. The aortic valve was calcified, and velocities and gradients measured by continuous‐wave Doppler met standard criteria for severe aortic stenosis. The increased subvalvular velocities invalidated assumptions of the simplified Bernoulli equation; correction using the longer form of the Bernoulli equation suggested a lower but still significant gradient. The complex shape of the subvalvular spectral Doppler envelope indicated supranormal systolic function and dynamic left ventricular outflow obstruction. Left heart catheterization with an end‐hole catheter was required to determine the subvalvular and valvular components of the obstruction. 相似文献
5.
6.
Bernard Natukunda Grace Ndeezi Lay See Er Francis Bajunirwe Gayle Teramura Meghan Delaney 《ISBT科学丛刊》2019,14(4):366-373
7.
8.
9.
Agenesis of the Gallbladder Revisited Laparoscopically 总被引:1,自引:0,他引:1
Najam Azmat M.D. Kenneth R. Francis M.D. Neal Mandava M.D. Walter F. Pizzi M.D. 《The American journal of gastroenterology》1993,88(8):1269-1270
Gallbladder agenesis is an extremely rare disease. Necropsy incidence has been reported to be 0.016%. Failure lo locate the gallbladder at the time of a planned cholecystectomy can be very challenging. We report such a case during a laparoscopic cholecystectomy. The indication for surgery in these patients are complaints of gallbladder symptoms along with a false-positive ultrasound study. During exploration, an abnormal location of the gallbladder has to be excluded. Ectopic gallbladder locations include intrahepatic, lesser omentum, retroperitoneal, retrohepatic, within the falciform ligament, retroduodenal, and retrohepatic areas. Thorough exploration and cholangiography are essential. Embryologically, the gallbladder and cystic duct arise from the caudal portion of the hepatic bud. All of the previously reported cases of gallbladder agenesis have shown an absence of both the gallbladder and cystic duct. We report an embryological oddity wherein a patent cystic duct was found along with an agenetic gallbladder. This is the first case report of this finding, along with this being the first absent gallbladder discovered laparoscopically. 相似文献
10.
Teaching psychiatric ethics 总被引:1,自引:0,他引:1
S Bloch 《Medical education》1988,22(6):550-553
In the last decade, we have witnessed a burgeoning of interest in ethical issues amongst psychiatrists. Teaching of the subject, however, remains at a rudimentary stage. Various approaches to such instruction are available, particularly modelling (students observe their experienced counterpart), the case method (examining specific clinical situations which involve a need for ethical decision-making), and the seminar approach (trainees are exposed to a core body of knowledge, mainly theoretical in nature). Faced with these different teaching models, the University of Oxford Department of Psychiatry has opted for a blend of all three approaches, which incorporates two goals: an increase in the trainees' sensitivity to the many intricate moral dilemmas facing the psychiatric profession; and their familiarity with salient concepts in moral philosophy which constitute a basis for ethical reasoning and which have a bearing on clinical practice. The teaching programme comprises the following: a pair of trainees prepares a presentation on an aspect of psychiatric ethics under the supervision of a senior psychiatrist. A moral philosopher assumes the role of discussant of the ethical problems raised by the trainees; this is followed by a general discussion. Topics have included involuntary hospitalization, dual loyalty, suicide, psychiatric diagnosis, and ethical issues in various spheres of psychiatric practice such as sex therapy, psychotherapy and child psychiatry. The approach has worked effectively and proved rewarding to all participants involved. 相似文献