首页 | 官方网站   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   125367篇
  免费   7627篇
  国内免费   1201篇
医药卫生   134195篇
  2023年   664篇
  2022年   1348篇
  2021年   4390篇
  2020年   2110篇
  2019年   2948篇
  2018年   3682篇
  2017年   2994篇
  2016年   3903篇
  2015年   5451篇
  2014年   6449篇
  2013年   7535篇
  2012年   11257篇
  2011年   10792篇
  2010年   6183篇
  2009年   5320篇
  2008年   7533篇
  2007年   7224篇
  2006年   6488篇
  2005年   5997篇
  2004年   5220篇
  2003年   4540篇
  2002年   3911篇
  2001年   3042篇
  2000年   2795篇
  1999年   2148篇
  1998年   939篇
  1997年   695篇
  1996年   536篇
  1995年   473篇
  1994年   411篇
  1993年   346篇
  1992年   755篇
  1991年   705篇
  1990年   651篇
  1989年   571篇
  1988年   487篇
  1987年   477篇
  1986年   335篇
  1985年   376篇
  1984年   264篇
  1983年   194篇
  1982年   137篇
  1981年   175篇
  1980年   134篇
  1979年   222篇
  1978年   165篇
  1977年   121篇
  1976年   137篇
  1975年   125篇
  1974年   139篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Journal of Immigrant and Minority Health - Immunomodulating therapies for COVID-19 may carry risks of reactivating latent infections in foreign-born people. We conducted a rapid review of...  相似文献   
992.
We investigated the kinetics of severe acute respiratory syndrome coronavirus 2 neutralizing antibodies in 7 asymptomatic persons and 11 patients with pneumonia. The geometric mean titer of neutralizing antibodies declined from 219.4 at 2 months to 143.7 at 5 months after infection, indicating a waning antibody response.  相似文献   
993.
We diagnosed tuberculosis in an illegally wild-captured pet ring-tailed lemur manifesting lethargy, anorexia, and cervical lymphadenopathy. Whole-genome sequencing confirmed the Mycobacterium tuberculosis isolate belonged to lineage 3 and harbored streptomycin resistance. We recommend reverse zoonosis prevention and determination of whether lemurs are able to maintain M. tuberculosis infection.  相似文献   
994.
A concerning development during the coronavirus disease pandemic has been multisystem inflammatory syndrome in children. Reports of this condition in East Asia have been limited. In South Korea, 3 cases were reported to the national surveillance system for multisystem inflammatory syndrome in children. All case-patients were hospitalized and survived with no major disease sequelae.  相似文献   
995.

Asian American immigrant (AAI) women may have suboptimal 24-h activity patterns due to traditional gender role and caregiving responsibilities. However, little is known about their objectively-measured activity. We measured AAI women’s 24-h activity patterns using accelerometry and examined cultural correlates of time in sedentary behavior (SB), light intensity physical activity (LIPA), moderate-to-vigorous physical activity (MVPA) and sleep. Seventy-five AAI women completed surveys on acculturation (years of U.S. residency and English proficiency), discrimination, and sleep quality, and 7 days of wrist- and hip-accelerometer monitoring. Linear regression was conducted controlling for age, BMI, and education. We also compared activity patterns across Asian subgroups (East, Southeast, South Asians). On average, AAI women had 33 min of MVPA, 6.1 h of LIPA, 10 h of SB, and 5.3 h of sleep per day. South Asian women had the longest SB and the shortest sleep and MVPA hours. English proficiency was negatively related to MVPA (p?=?0.03) and LIPA (p?<?0.01). Years of U.S. residency was positively related to SB (p?=?0.07). Discrimination was related to shorter (p?=?0.03) and poorer quality sleep (p?=?0.06). Culturally-tailored programs targeting SB and sleep and integrating coping strategies against discrimination could help optimize AAI women’s 24-h activity patterns.

  相似文献   
996.
International Urology and Nephrology - Multidetector computed tomographic urography (MDCTU) is not yet sufficient to be used in the clinical staging of upper tract urothelial carcinoma (UTUC). This...  相似文献   
997.
International Urology and Nephrology - To date, several studies have reported inconsistent findings regarding the mortality risk faced by living kidney donors and controls. Our study assessed the...  相似文献   
998.
International Urology and Nephrology - Late onset hypogonadism (LOH) is an age-dependent reduction of testosterone associated with alterations of metabolic profile, including glucose control,...  相似文献   
999.
Lasers in Medical Science - The use of zirconia for implants and abutments has become more prevalent in implant dentistry as an alternative to the commonly used titanium implants, and peri-implant...  相似文献   
1000.
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-23

京公网安备 11010802026262号