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   4306787篇
  免费   343849篇
  国内免费   15251篇
耳鼻咽喉   58645篇
儿科学   135982篇
妇产科学   113164篇
基础医学   661286篇
口腔科学   119625篇
临床医学   392789篇
内科学   771796篇
皮肤病学   109621篇
神经病学   356952篇
特种医学   168697篇
外国民族医学   456篇
外科学   657613篇
综合类   126342篇
现状与发展   23篇
一般理论   2516篇
预防医学   350205篇
眼科学   102754篇
药学   306495篇
  25篇
中国医学   12710篇
肿瘤学   218191篇
  2021年   56305篇
  2020年   35842篇
  2019年   58940篇
  2018年   74397篇
  2017年   56563篇
  2016年   62793篇
  2015年   75974篇
  2014年   110433篇
  2013年   176124篇
  2012年   120153篇
  2011年   124651篇
  2010年   125654篇
  2009年   127035篇
  2008年   110364篇
  2007年   117270篇
  2006年   125643篇
  2005年   120164篇
  2004年   121192篇
  2003年   110910篇
  2002年   99876篇
  2001年   168636篇
  2000年   163632篇
  1999年   149449篇
  1998年   72224篇
  1997年   67801篇
  1996年   65653篇
  1995年   61207篇
  1994年   55016篇
  1993年   51158篇
  1992年   106626篇
  1991年   101947篇
  1990年   97756篇
  1989年   95308篇
  1988年   87345篇
  1987年   85076篇
  1986年   80725篇
  1985年   78912篇
  1984年   65896篇
  1983年   58728篇
  1982年   47336篇
  1981年   44068篇
  1980年   41426篇
  1979年   55665篇
  1978年   44932篇
  1977年   40878篇
  1976年   37101篇
  1975年   36880篇
  1974年   40031篇
  1973年   38591篇
  1972年   36110篇
排序方式: 共有10000条查询结果,搜索用时 250 毫秒
991.
992.
993.
994.
995.
996.
997.
998.
Inbred mouse strains are the most widely used mammalian model organism in biomedical research owing to ease of genetic manipulation and short lifespan; however, each inbred strain possesses a unique repertoire of deleterious homozygous alleles that can make a specific strain more susceptible to a particular disease. In the current study, we report dystrophic cardiac calcinosis (DCC) in C.B‐17 SCID male mice at 10 weeks of age with no significant change in cardiac function. Acquisition of DCC was characterized by myocardial injury, fibrosis, calcification, and necrosis of the tissue. At 10 weeks of age, 38% of the C.B‐17 SCID mice from two different commercial colonies exhibited significant calcinosis on the ventricular epicardium, predominantly on the right ventricle. The frequency of calcinosis was more than 50% for mice obtained from Taconic's Cambridge City colony and 25% for mice obtained from Taconic's German Town colony. Interestingly, the DCC phenotype did not affect cardiac function at 10 weeks of age. No differences in echocardiography or electrocardiography were observed between the calcinotic and non‐calcinotic mice from either colony. Our findings suggest that C.B‐17 SCID mice exhibit DCC as early as 10 weeks of age with no significant impact on cardiac function. This strain of mice should be cautiously considered for the study of cardiac physiology.  相似文献   
999.

Objective

To discover the experiences of end-of-life patients attended by the emergency services, through the discourse of the family caregivers who accompanied the family member in this care transit.

Method

A qualitative approach study, based on the paradigm of hermeneutical phenomenology. In total, 81 family caregivers participated. The techniques used were the in-depth interview and the discussion group, with a total of 5 discussion groups and 41 interviews. The period of data collection was carried out between January 2013 and June 2014.

Results

In the network of discourses obtained with respect to “Urgent Care”, all the codes were grouped in relation to a single argumentative line: deficiencies in urgent care. Among them, we found different dimensions that are established depending on the different times of care, or the different determinant aspects of these deficiencies: disorganization of the care received, lack of experience of the professionals in emergencies, application of general protocols in the emergency services, inadequate care in the treatment received, delays in emergency care.

Conclusions

In general, we highlight the dissatisfaction of the family members with respect to the care received from the emergency services. The needs of these types of situation are not covered from these services and are of low quality. Therefore, it is necessary to reorient the care protocols for these patients.  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