首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1704篇
  免费   95篇
  国内免费   9篇
耳鼻咽喉   11篇
儿科学   40篇
妇产科学   40篇
基础医学   132篇
口腔科学   38篇
临床医学   156篇
内科学   396篇
皮肤病学   21篇
神经病学   75篇
特种医学   52篇
外科学   394篇
综合类   35篇
一般理论   4篇
预防医学   125篇
眼科学   38篇
药学   134篇
中国医学   34篇
肿瘤学   83篇
  2024年   4篇
  2023年   30篇
  2022年   71篇
  2021年   88篇
  2020年   45篇
  2019年   66篇
  2018年   83篇
  2017年   53篇
  2016年   61篇
  2015年   58篇
  2014年   80篇
  2013年   98篇
  2012年   134篇
  2011年   127篇
  2010年   77篇
  2009年   52篇
  2008年   90篇
  2007年   79篇
  2006年   80篇
  2005年   77篇
  2004年   85篇
  2003年   77篇
  2002年   56篇
  2001年   19篇
  2000年   16篇
  1999年   16篇
  1998年   6篇
  1997年   6篇
  1996年   4篇
  1995年   7篇
  1994年   5篇
  1993年   3篇
  1992年   4篇
  1991年   6篇
  1990年   2篇
  1989年   4篇
  1988年   2篇
  1987年   4篇
  1985年   4篇
  1982年   2篇
  1981年   1篇
  1980年   1篇
  1979年   1篇
  1978年   2篇
  1977年   2篇
  1975年   1篇
  1973年   5篇
  1972年   4篇
  1971年   6篇
  1970年   2篇
排序方式: 共有1808条查询结果,搜索用时 18 毫秒
11.
We report here a rare case of bilateral pure gonadoblastoma which accounts for only 0.2% of all ovarian tumours seen at Universiti Kebangsaan Malaysia from 1980 to 1987. This tumour occurred in an 18 year old Chinese "female" who presented with primary amenorrhoea. Examination showed a phenotypic female with poorly developed external gentalia. Exploratory laparotomy revealed a hypoplastic uterus, rudimentary fallopian tubes and streak gonads. Histological examination of the gonads showed a mixed tumour comprising large germ cells and smaller sex cord derivatives arranged in characteristic nests or islands containing hyaline material.  相似文献   
12.
13.
14.
15.
16.
17.
18.
The present study was designed to investigate the toxico-pathological effect of cadmium (Cd) and its amelioration with silymarin (SL) and milk thistle (MT) in male Japanese quail (Coturnix japonica). A total of 144 male quail were divided into nine equal groups (A–I). Experimental feeds were offered to these groups containing different combinations of Cd chloride (Cd1: 150 and Cd2: 300?mg/kg feed), SL (250?mg/kg of feed), and MT (10?g/kg of feed). The duration of the experiment was 60 days. The physical parameters studied included feed intake and body weight. Hematobiochemical parameters included total protein, albumin, ALT, AST, creatinine, urea, hemoglobin, and hematocrit. The data were analyzed by analysis of variance (ANOVA) technique, and group means were compared by Duncan’s multiple range test. The body weight decreased significantly in Cd-treated groups while SL and MT ameliorated the toxic effects of Cd as compared to control group. The hemoglobin (Hb) concentration and hematocrit (Hct) values were decreased significantly in Cd2-treated group, while Hb and Hct decreased nonsignificantly in Cd1-treated group compared with control. Similar hematological findings were observed, when Cd was used in combinations with SL and MT. Urea, creatinine, and AST increased significantly, while ALT increased nonsignificantly in Cd-treated groups as compared to control group, while total protein, albumin, and globulin decreased significantly in Cd-treated groups as compared to control group. The SL and MT completely ameliorated these toxic effects at low dose of Cd; however, amelioration was partial at higher doses of Cd. These compounds (SL &; MT) might be used to ameliorate toxic effects of Cd in Japanese quail.  相似文献   
19.
Few studies have compared quality of sleep between pre-dialysis chronic kidney disease (pre-dialysis CKD) patients and end-stage renal disease patients on dialysis (ESRD) and have found inconsistent results. Objective of this study is to compare quality of sleep between patients with pre-dialysis CKD and ESRD in a developing country. This study was conducted in an out-patient department and hemodialysis unit of a tertiary care facility. Patients included had either pre-dialysis CKD or ESRD. Assessment of quality of sleep was done using Pittsburgh sleep quality index (PSQI). A total of 152 patients were included in the study. Out of these patients, 79 (52%) had ESRD and 73 (48%) had pre-dialysis CKD. Median PSQI score was 6 (IQR 3–8.8). Poor sleep quality (PSQI ≥5) was present in 100 (65.8%) patients. Only hemoglobin (β?=??0.39, p?β?=?0.56, p?β?=?0.22, p?r?=??0.34, p value .80) in pre-dialysis CKD patients. Poor sleep quality is common in patients with CKD including hemodialysis patients in a developing country, which is independent of kidney function in non-dialysis patients. There is no difference in quality of sleep between pre-dialysis CKD and ESRD patients.  相似文献   
20.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号