全文获取类型
收费全文 | 2855篇 |
免费 | 145篇 |
国内免费 | 153篇 |
专业分类
耳鼻咽喉 | 79篇 |
儿科学 | 90篇 |
妇产科学 | 27篇 |
基础医学 | 302篇 |
口腔科学 | 35篇 |
临床医学 | 310篇 |
内科学 | 634篇 |
皮肤病学 | 41篇 |
神经病学 | 301篇 |
特种医学 | 368篇 |
外科学 | 356篇 |
综合类 | 59篇 |
预防医学 | 188篇 |
眼科学 | 43篇 |
药学 | 175篇 |
1篇 | |
中国医学 | 1篇 |
肿瘤学 | 143篇 |
出版年
2021年 | 14篇 |
2020年 | 15篇 |
2019年 | 36篇 |
2018年 | 34篇 |
2017年 | 24篇 |
2016年 | 26篇 |
2015年 | 31篇 |
2014年 | 52篇 |
2013年 | 109篇 |
2012年 | 67篇 |
2011年 | 101篇 |
2010年 | 85篇 |
2009年 | 92篇 |
2008年 | 103篇 |
2007年 | 205篇 |
2006年 | 84篇 |
2005年 | 115篇 |
2004年 | 79篇 |
2003年 | 77篇 |
2002年 | 95篇 |
2001年 | 83篇 |
2000年 | 87篇 |
1999年 | 92篇 |
1998年 | 103篇 |
1997年 | 93篇 |
1996年 | 82篇 |
1995年 | 77篇 |
1994年 | 51篇 |
1993年 | 58篇 |
1992年 | 53篇 |
1991年 | 55篇 |
1990年 | 52篇 |
1989年 | 88篇 |
1988年 | 62篇 |
1987年 | 70篇 |
1986年 | 61篇 |
1985年 | 50篇 |
1984年 | 43篇 |
1983年 | 40篇 |
1982年 | 43篇 |
1981年 | 23篇 |
1980年 | 25篇 |
1979年 | 29篇 |
1978年 | 19篇 |
1977年 | 27篇 |
1976年 | 35篇 |
1975年 | 22篇 |
1971年 | 15篇 |
1970年 | 13篇 |
1969年 | 15篇 |
排序方式: 共有3153条查询结果,搜索用时 503 毫秒
21.
22.
Intestinal schistosomiasis japonica: CT-pathologic correlation 总被引:1,自引:0,他引:1
Lee RC; Chiang JH; Chou YH; Rubesin SE; Wu HP; Jeng WC; Hsu CC; Tiu CM; Chang T 《Radiology》1994,193(2):539
23.
24.
25.
26.
A new behavioral assessment scale for geriatric out- and in-patients: the NOSGER (Nurses' Observation Scale for Geriatric Patients) 总被引:1,自引:0,他引:1
R Spiegel C Brunner D Ermini-Fünfschilling A Monsch M Notter J Puxty L Tremmel 《Journal of the American Geriatrics Society》1991,39(4):339-347
Although a great number of psychometric tests and rating scales for the assessment of psychogeriatric patients is available, there is still an urgent need, in research and practice, for a clinical rating instrument that meets the following main requirements: (1) applicable to institutionalized and community patients and covering a wide range of behavioral pathology; (2) acceptable and easy to use for professionals and lay persons alike; (3) covering a wide range of behavior relevant to daily functioning but independent of sex or social status of the individual assessed. The NOSGER contains 30 items of behavior, each rated on a 5-point scale according to frequency of occurrence. Item scores are summarized into 6 Dimension scores (memory, instrumental activities of daily life, self-care, mood, social behavior, and disturbing behavior) which are clinically relevant in dementia, depression, and other psychiatric disorders of old age. Validation studies with a preliminary version of the NOSGER indicated good acceptance of the scale, high inter-rater and test-retest reliability, and high correlations of all NOSGER Dimension scores with results of a variety of established assessment instruments. The NOSGER is currently being used in a number of European and North American centers and should turn out to be a useful instrument for longitudinal studies in psychogeriatrics. 相似文献
27.
28.
The patellofemoral joint was imaged with magnetic resonance (MR) in the axial plane while the knee was positioned from 0 degrees to 32 degrees of flexion (nine positions). These multiple sequential images obtained within the early phases of flexion of the knee were viewed in a "cine-loop" format, producing a kinematic study that clearly demonstrated the relationship of the patella to the trochlear groove. Four healthy subjects and one patient with known bilateral subluxing patellae were studied. The preliminary results suggest that kinematic MR imaging of the patellofemoral joint is potentially useful for the evaluation of patellar tracking abnormalities. 相似文献
29.
Follicular dendritic cells are a major reservoir for human immunodeficiency virus type 1 in lymphoid tissues facilitating infection of CD4+ T-helper cells. 总被引:9,自引:5,他引:9
下载免费PDF全文
![点击此处可从《The American journal of pathology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
H. Spiegel H. Herbst G. Niedobitek H. D. Foss H. Stein 《The American journal of pathology》1992,140(1):15-22
Human immunodeficiency virus type 1 (HIV-1) infection causes progressive depletion of CD4/HIV-receptor-positive T helper lymphocytes, ultimately leading to AIDS. The major HIV reservoir and site of T-helper cell infection in lymphoid tissues, however, has remained poorly defined. The authors used in situ hybridization in combination with immunohistologic labeling techniques to identify the phenotype of HIV-infected cells in lymph nodes from patients at different stages of HIV-infection. The number of HIV-infected macrophages, widely considered the major site of HIV replication, was extremely low. There was no evidence for HIV-infection of endothelial and interdigitating reticulum cells. However, HIV RNA was found in small but consistent proportions of CD45RO-positive T cells and in the vast majority of follicular dendritic cells (FDC) in a pattern suggestive of active infection in addition to HIV-immunocomplex trapping on cell membranes. FDC may therefore be a major HIV reservoir and since T-helper cells travel through the FDC meshwork during their migration within lymphoreticular tissues, it appears likely that HIV-replicating T cells may infect FDC, which then infect new T cells, thus causing a gradual dissemination of the virus to all FDC and thereby a steadily increasing infection of T-helper/memory cells within germinal centers. This results in CD4+ T cell depletion, and ultimately, in immunodeficiency. 相似文献
30.
T A Spiegel A J Stunkard E E Shrager C P O'Brien M F Morrison E Stellar 《Physiology & behavior》1987,40(2):135-141
Increasing doses of naltrexone (25 to 200 mg) given over 4 consecutive days reduced intake of laboratory luncheon meals by 30% in 17 obese men. Meal size remained suppressed in the laboratory during the week following naltrexone administration. Water intake in the laboratory and body weight were not affected. Rates of ingestion and subjective ratings suggested that naltrexone reduced appetite rather than promoted early satiation. Nausea and other side effects occurred on 1 or 2 days during the naltrexone week in seven subjects whose food intake was reduced. Food intake was also reduced in seven of the remaining 10 subjects who reported no adverse reactions. These results suggest that a conditioned taste aversion or a conditioned anorexia may have developed in some subjects. 相似文献