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   129235篇
  免费   44970篇
  国内免费   271篇
耳鼻咽喉   1813篇
儿科学   6270篇
妇产科学   724篇
基础医学   24809篇
口腔科学   6786篇
临床医学   16695篇
内科学   28234篇
皮肤病学   4389篇
神经病学   18714篇
特种医学   6211篇
外国民族医学   2篇
外科学   16524篇
综合类   2042篇
现状与发展   2篇
一般理论   10篇
预防医学   14483篇
眼科学   1378篇
药学   10458篇
  14篇
中国医学   1881篇
肿瘤学   13037篇
  2024年   30篇
  2023年   432篇
  2022年   962篇
  2021年   2764篇
  2020年   6849篇
  2019年   12130篇
  2018年   11644篇
  2017年   12944篇
  2016年   12061篇
  2015年   11984篇
  2014年   12090篇
  2013年   12719篇
  2012年   11254篇
  2011年   11253篇
  2010年   9803篇
  2009年   6183篇
  2008年   6720篇
  2007年   5146篇
  2006年   4841篇
  2005年   4518篇
  2004年   4329篇
  2003年   3924篇
  2002年   3649篇
  2001年   2824篇
  2000年   1638篇
  1999年   423篇
  1998年   156篇
  1997年   154篇
  1996年   152篇
  1995年   103篇
  1994年   77篇
  1993年   99篇
  1992年   61篇
  1991年   81篇
  1990年   43篇
  1989年   50篇
  1988年   41篇
  1987年   38篇
  1986年   26篇
  1985年   58篇
  1984年   28篇
  1983年   21篇
  1982年   45篇
  1981年   24篇
  1980年   25篇
  1979年   16篇
  1978年   18篇
  1977年   12篇
  1976年   8篇
  1975年   9篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
61.
高强度聚焦超声(high-intensity focused ultrasound,HIFU)消融治疗子宫肌瘤作为一种新的非侵入性的治疗方式,已越来越广泛地用于子宫肌瘤的治疗。但是对于HIFU治疗时妊娠的处理及妊娠结局鲜有文献报道。本文报道1例HIFU消融治疗子宫肌瘤时妊娠的病例,结合文献复习,探讨子宫平滑肌瘤对妊娠的影响、子宫平滑肌瘤不同处理方式对妊娠的影响、HIFU消融治疗子宫肌瘤时机选择的问题、HIFU消融治疗子宫肌瘤若同时合并妊娠时胎儿去留的问题以及近期HIFU消融治疗子宫肌瘤后对流产手术操作的影响等,以期对HIFU治疗子宫肌瘤的适应证、选择合适的治疗时间及术后选择合适的妊娠时机展开讨论。  相似文献   
62.
63.
Classical Kaposi sarcoma (KS) usually appears on lower extremities accompanied or preceded by local lymphedema. However, the development in areas of chronic lymphedema of the arms following mastectomy, mimicking a Stewart–Treves syndrome, has rarely been described. We report an 81‐year‐old woman who developed multiple, erythematous to purple tumors, located on areas of post mastectomy lymphedema. Histopathological examination evidenced several dermal nodules formed by spindle‐shaped cells that delimitated slit‐like vascular spaces with some red cell extravasation. Immunohistochemically, the human herpesvirus type 8 (HHV‐8) latent nuclear antigen‐1 was detected in the nuclei of most tumoral cells confirming the diagnosis of KS. Lymphedema could promote the development of certain tumors by altering immunocompetence. Although angiosarcoma (AS) is the most frequent neoplasia arising in the setting of chronic lymphedema, other tumors such as benign lymphangiomatous papules (BLAP) or KS can also develop in lymphedematous limbs. It is important to establish the difference between AS and KS because their prognosis and treatment are very different. Identification by immunohistochemistry of HHV‐8 is useful for the distinction between KS and AS or BLAP.  相似文献   
64.
65.
Erythema induratum of Bazin (EIB) is a form of tuberculid resulting from hypersensitivity to tuberculosis antigen. EIB occurs most commonly in middle‐aged women and is not typically seen in children. Here, we present a rare case of EIB, presenting as a chronic nodular panniculitis, in a 10‐year‐old Korean boy.  相似文献   
66.
67.
Objective: Longitudinal data on cardiometabolic effects of egg intake during adolescence are lacking. The current analyses aim to evaluate the impact of usual adolescent egg consumption on lipid levels, fasting glucose, and insulin resistance during late adolescence (age 17–20?years).

Methods: Data from 1392 girls, aged 9 to 10 at baseline and followed for 10?years, in the National Heart, Lung, and Blood Institute’s National Growth and Health Study were used to examine the association between usual egg intake alone and in combination with other healthy lifestyle factors and late adolescent lipid levels, fasting glucose, and insulin resistance, measured as homeostasis model assessment of insulin resistance (HOMA-IR). Diet was assessed using 3-day food records during eight examination cycles. Girls were classified according to usual weekly egg intake, ages 9–17?years:?<1 egg/wk (n?=?361), 1 to <3 eggs/wk (n?=?703), and ≥3 eggs/wk (n?=?328). Analysis of covariance modeling was used to control for confounding by other behavioral and biological risk factors.

Results: Girls with low, moderate, and high egg intakes had adjusted low-density lipoprotein cholesterol levels of 99.7, 98.8, and 95.5 mg/dL, respectively (p?=?0.0778). In combination with higher intakes of fiber, dairy, or fruits and vegetables, these beneficial effects were stronger and statistically significant. There was no evidence that ≥3 eggs/wk had an adverse effect on lipids, glucose, or HOMA-IR. More active girls who consumed ≥3 eggs/wk had the lowest levels of insulin resistance.

Conclusion: These results suggest that eggs may be included as part of a healthy adolescent diet without adverse effects on glucose, lipid levels, or insulin resistance.  相似文献   

68.
69.
70.
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