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   3018348篇
  免费   263167篇
  国内免费   13334篇
耳鼻咽喉   41412篇
儿科学   95465篇
妇产科学   76002篇
基础医学   495507篇
口腔科学   81219篇
临床医学   272307篇
内科学   521345篇
皮肤病学   85029篇
神经病学   258152篇
特种医学   118400篇
外国民族医学   100篇
外科学   473425篇
综合类   94124篇
现状与发展   23篇
一般理论   2113篇
预防医学   253691篇
眼科学   69330篇
药学   205574篇
  20篇
中国医学   9724篇
肿瘤学   141887篇
  2021年   54736篇
  2020年   34987篇
  2019年   57871篇
  2018年   70305篇
  2017年   53192篇
  2016年   58570篇
  2015年   73093篇
  2014年   107192篇
  2013年   172160篇
  2012年   80385篇
  2011年   78677篇
  2010年   113696篇
  2009年   118700篇
  2008年   65945篇
  2007年   67547篇
  2006年   78851篇
  2005年   74078篇
  2004年   76413篇
  2003年   67435篇
  2002年   57545篇
  2001年   85181篇
  2000年   77122篇
  1999年   80589篇
  1998年   63063篇
  1997年   61293篇
  1996年   59004篇
  1995年   54531篇
  1994年   48709篇
  1993年   45486篇
  1992年   54369篇
  1991年   52188篇
  1990年   49268篇
  1989年   49442篇
  1988年   45700篇
  1987年   44458篇
  1986年   42270篇
  1985年   42809篇
  1984年   41083篇
  1983年   38186篇
  1982年   38928篇
  1981年   36981篇
  1980年   34965篇
  1979年   32865篇
  1978年   30797篇
  1977年   28627篇
  1976年   26286篇
  1975年   24900篇
  1974年   24654篇
  1973年   23524篇
  1972年   22004篇
排序方式: 共有10000条查询结果,搜索用时 859 毫秒
971.
972.
973.
974.
975.
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   
976.

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   
977.
978.

Background

A history of childhood maltreatment and psychopathology are common in adults with obesity.

Objectives

To report childhood maltreatment and to evaluate associations between severity and type of childhood maltreatment and lifetime history of psychopathology among adults with severe obesity awaiting bariatric surgery.

Setting

Four clinical centers of the Longitudinal Assessment of Bariatric Surgery Research Consortium.

Methods

The Childhood Trauma Questionnaire, which assesses presence/severity (i.e., none, mild, moderate, severe) of physical abuse, mental abuse, physical neglect, mental neglect, and sexual abuse, was completed by 302 female and 66 male bariatric surgery patients. Presurgery lifetime history of psychopathology and suicidal ideation/behavior were assessed with the Structured Clinical Interview for DSM-IV and the Suicidal Behavioral Questionnaire-Revised, respectively. Presurgery lifetime history of antidepressant use was self-reported.

Results

Two thirds (66.6%) of females and 47.0% of males reported at least 1 form of childhood trauma; 42.4% and 24.2%, respectively, at greater than or equal to moderate severity. Among women, presence/greater severity of childhood mental or physical abuse or neglect was associated with a higher risk of history of psychopathology (i.e., major depressive disorder, posttraumatic stress disorder, other anxiety disorder, alcohol use disorder, binge eating disorder), suicidal ideation/behavior and antidepressant use (P for all ≤ .02). These associations were independent of age, race, education, body mass index, and childhood sexual abuse. Childhood sexual abuse was independently associated with a history of suicidal ideation/behavior and antidepressant use only (P for both ≤ .05). Statistical power was limited to evaluate these associations among men.

Conclusion

Among women with obesity, presence/severity of childhood trauma was positively associated with relatively common psychiatric disorders.  相似文献   
979.
980.
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