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   128480篇
  免费   45062篇
  国内免费   221篇
耳鼻咽喉   1838篇
儿科学   5711篇
妇产科学   1315篇
基础医学   24942篇
口腔科学   6732篇
临床医学   15461篇
内科学   30730篇
皮肤病学   4420篇
神经病学   18996篇
特种医学   6007篇
外国民族医学   1篇
外科学   17207篇
综合类   1846篇
一般理论   9篇
预防医学   11387篇
眼科学   1420篇
药学   10054篇
  2篇
中国医学   1905篇
肿瘤学   13780篇
  2024年   28篇
  2023年   548篇
  2022年   893篇
  2021年   2857篇
  2020年   6957篇
  2019年   12254篇
  2018年   11738篇
  2017年   12800篇
  2016年   11948篇
  2015年   11823篇
  2014年   11977篇
  2013年   12633篇
  2012年   11032篇
  2011年   11012篇
  2010年   9544篇
  2009年   6068篇
  2008年   6655篇
  2007年   5043篇
  2006年   4843篇
  2005年   4509篇
  2004年   4336篇
  2003年   3905篇
  2002年   3637篇
  2001年   2808篇
  2000年   1571篇
  1999年   425篇
  1998年   205篇
  1997年   198篇
  1996年   176篇
  1995年   159篇
  1994年   141篇
  1993年   130篇
  1992年   123篇
  1991年   103篇
  1990年   87篇
  1989年   71篇
  1988年   77篇
  1987年   62篇
  1986年   75篇
  1985年   79篇
  1984年   57篇
  1983年   42篇
  1982年   30篇
  1981年   19篇
  1980年   11篇
  1979年   23篇
  1978年   11篇
  1977年   6篇
  1976年   11篇
  1974年   6篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
The coronavirus disease 2019 (COVID-19) pandemic has rapidly created widespread impacts on global health and the economy. Data suggest that women are less susceptible to severe illness. However, sex-disaggregated data are incomplete, leaving room for misinterpretation, and focusing only on biologic sex underestimates the gendered impact of the pandemic on women. This narrative review summarizes what is known about gender disparities during the COVID-19 pandemic and the economic, domestic, and health burdens along with overlapping vulnerabilities related to the pandemic. In addition, this review outlines recommended strategies that advocacy groups, community leaders, and policymakers should implement to mitigate the widening gender disparities related to COVID-19.  相似文献   
3.
4.
5.
6.
Cutaneous leiomyomas are rare benign smooth‐muscle tumors. These lesions are distinguished based on their cell of origin and are subclassified as pilar leiomyoma, angioleiomyoma, and genital‐type leiomyoma. Nipple leiomyoma is the least common genital‐type leiomyoma, arising from the dartoic muscle cell of the nipple. Histologic examination of the lesion is necessary for definitive diagnosis, and these uncommon tumors can pose a diagnostic challenge. We describe herein a series of six nipple leiomyomas with a spectrum of histologic appearances.  相似文献   
7.
Although dose reduction of S‐1 is recommended for patients with impaired renal function, dose modification for such patients has not been prospectively evaluated. The aim of the present study was to investigate the pharmacokinetic parameters of 5‐fluorouracil, 5‐chloro‐2,4 dihydroxypyridine and oteracil potassium, and to review the recommended dose modification of S‐1 in patients with renal impairment. We classified patients receiving S‐1 into 4 groups according to their renal function, as measured using the Japanese estimated glomerular filtration rate (eGFR) equation. The daily S‐1 dose was adjusted based on the patient's eGFR and body surface area. Blood samples were collected for pharmacokinetic analysis. A total of 33 patients were enrolled and classified into 4 groups as follows: 10 patients in cohort 1 (eGFR ≥ 80 mL/min/1.73 m2), 10 patients in cohort 2 (eGFR = 50‐79 mL/min/1.73 m2), 10 patients in cohort 3 (eGFR = 30‐49 mL/min/1.73 m2), and 3 patients in cohort 4 (eGFR < 30 mL/min/1.73 m2). Those in cohorts 3 and 4 treated with an adjusted dose of S‐1 showed a similar area under the curve for 5‐fluorouracil (941.9 ± 275.6 and 1043.5 ± 224.8 ng/mL, respectively) compared with cohort 2 (1034.9 ± 414.3 ng/mL). Notably, while there was a statistically significant difference between cohort 1 (689.6 ± 208.8 ng/mL) and 2 (= 0.0474) treated with an equal dose of S‐1, there was no significant difference observed in the toxicity profiles of the cohorts. In conclusion, dose adjustment of S‐1 in patients with impaired renal function using eGFR is appropriate and safe.  相似文献   
8.
9.
10.
Among the chief limitations in achieving early detection and control of animal‐origin influenza of pandemic potential in high‐risk livestock populations is the existing lag time between sample collection and diagnostic result. Advances in molecular diagnostics are permitting deployment of affordable, rapid, highly sensitive, and specific point‐of‐capture assays, providing opportunities for targeted surveillance driving containment strategies with potentially compelling returns on investment. Interrupting disease transmission at source holds promise of disrupting cycles of animal‐origin influenza incursion to endemicity and limiting impact on animal production, food security, and public health. Adoption of new point‐of‐capture diagnostics should be undertaken in the context of promoting robust veterinary services systems and parallel support for operationalizing pre‐authorized plans and communication strategies that will ensure that the full potential of these new platforms is realized.  相似文献   
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