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   2186篇
  免费   124篇
  国内免费   5篇
耳鼻咽喉   18篇
儿科学   131篇
妇产科学   48篇
基础医学   236篇
口腔科学   67篇
临床医学   160篇
内科学   567篇
皮肤病学   49篇
神经病学   76篇
特种医学   440篇
外科学   169篇
综合类   53篇
预防医学   59篇
眼科学   22篇
药学   85篇
  1篇
肿瘤学   134篇
  2023年   19篇
  2022年   22篇
  2021年   24篇
  2020年   21篇
  2019年   22篇
  2018年   24篇
  2017年   35篇
  2016年   27篇
  2015年   30篇
  2014年   60篇
  2013年   57篇
  2012年   62篇
  2011年   65篇
  2010年   54篇
  2009年   80篇
  2008年   61篇
  2007年   74篇
  2006年   63篇
  2005年   57篇
  2004年   68篇
  2003年   52篇
  2002年   41篇
  2001年   46篇
  2000年   34篇
  1999年   39篇
  1998年   99篇
  1997年   91篇
  1996年   91篇
  1995年   77篇
  1994年   49篇
  1993年   65篇
  1992年   29篇
  1991年   17篇
  1990年   32篇
  1989年   65篇
  1988年   55篇
  1987年   56篇
  1986年   63篇
  1985年   84篇
  1984年   44篇
  1983年   36篇
  1982年   30篇
  1981年   33篇
  1980年   41篇
  1979年   5篇
  1978年   21篇
  1977年   25篇
  1976年   22篇
  1975年   20篇
  1965年   5篇
排序方式: 共有2315条查询结果,搜索用时 15 毫秒
51.
A two-and-half month-old female infant with cavernous haemangioma, agenesis and syndactyly of toes, microophthalmia and microcornea is reported.  相似文献   
52.
53.
A review of the literature regarding the effects of long-term psychotherapy indicates that it has rarely been examined purely from the standpoint of the patient. This study attempts to determine how the patients perceive attitudinal change in themselves and their therapists during the treatment process. Twenty patients who received dynamically oriented psychotherapy in excess of one year in a typical outpatient clinic participated. These patients were randomly assigned a therapist who was either a Clinic staff member or senior resident in psychiatry. Slightly more than half the patients included in the study had a diagnosis of psychoneurosis, while the remainder were viewed as possessing characterological or psychotic disturbances. Evaluation of patient attitudes was achieved through the use of a modified version of Osgood's Semantic Differential Scale. It was determined that patients perceived themselves as becoming significantly more like their therapists after one year of psychotherapy. They saw themselves as more active, independent, dominant, outgoing, realistic and happy. This "psychic shift" is discussed in terms of identification, transference and counter-transference phenomena.  相似文献   
54.
The influence of reported paternal attitudes on the decision to breast-feed   总被引:1,自引:0,他引:1  
Objective: To identify factors that influence a woman's decision to breast-feed.
Methodology: Five hundred and fifty-six women were recruited from the maternity wards of two Perth hospitals. Data were collected from a self-administered questionnaire completed by participants prior to discharge. Logistic regression analysis was used to determine factors influencing the initiation of breast-feeding.
Results: At discharge from hospital 83.8% of women were breast-feeding, including 6% who were giving complementary formula feeds. After controlling for potentially confounding demographic and biomedical factors, the father's reported preference for breast-feeding was found to be the most important factor influencing a woman's decision to breast-feed (OR 10.18).
Conclusion: Fathers participate in and influence the choice of infant feeding method and should be included in breast-feeding discussions.  相似文献   
55.
OBJECTIVE: Most neonatologists include an apnea-free period in the criteria for the discharge of preterm infants. However, the length of time one should wait after the cessation of apnea before sending an infant home without a monitor is debated. We undertook this study in an attempt to define a minimal and safe observation period between the time of the last apnea episode and discharge. METHODS: We reasoned that in infants with idiopathic apnea of prematurity, the intervals between days on which apnea occurs gradually increase until some point at which clinically significant apnea ceases. Therefore, knowledge about the intervals between days on which apnea occurred just before the last apnea would provide a reasonable estimate of the minimal safe observation interval between the last apnea and discharge. We reviewed the charts of 266 infants born in 1993 and 1994 at 相似文献   
56.
57.
The present study investigated the effects of dietary oltipraz on cigarette smoke-related lipophilic DNA adduct formation. Female Sprague- Dawley rats were exposed daily to sidestream cigarette smoke in a whole- body exposure chamber 6 h/day for 4 consecutive weeks. One group of rats was maintained on control diet while another group received the same diet supplemented with either a low (167 p.p.m.) or high (500 p.p.m.) dose of oltipraz, starting 1 week prior to initiation of smoke exposure until the end of the experiment. Analysis of lipophilic DNA adducts by the nuclease P1-mediated 32P-post-labeling showed up to five smoke-related adducts. Adduct no. 5 predominated in both the lung and the heart while adduct nos 3 and 2 predominated in the trachea and bladder, respectively. Quantitative analysis revealed that the total adduct level was the highest in lungs (270+/-68 adducts/10(10) nucleotides), followed by trachea (196+/-48 adducts/10(10) nucleotides), heart (141+/-22 adducts/10(10) nucleotides) and bladder (85+/-16 adducts/10(10) nucleotides). High dose oltipraz treatment reduced the adduct levels in lungs and bladder by >60%, while the reduction in lungs in the low-dose group was approximately 35%. In trachea, the effect of low and high dietary oltipraz on smoke DNA adduction was equivocal, while smoke-related DNA adducts in the heart were minimally inhibited by high-dose oltipraz. In a repeat experiment that employed a 3-fold lower dose of cigarette smoke, oltipraz (500 p.p.m.) was found to inhibit the formation of DNA adducts in rat lungs and trachea by 80 and 65%, respectively. These data clearly demonstrate a high efficacy of oltipraz in inhibiting the formation of cigarette smoke-induced DNA adducts in the target tissues.   相似文献   
58.
RA Dr. U. Baur 《Der Gyn?kologe》2004,37(11):1055-1056
  相似文献   
59.
Some of the girls who live in Germany and have Muslim parents are threatened by female genital mutilation. This report describes the kinds and medical consequences of female genital mutilation as well as the criminal judgement. Female genital mutilation is considered as dangerous bodily harm, not as grievous bodily harm. Consent does not justify the infringement of rights. The argument that Islam justifies the infringement of rights is irrelevant by law. The human right of bodily intactness has priority over the right of religious freedom. Finally the legal regulations about dealing with personal data are presented. A legal compulsory registration still does not exist.  相似文献   
60.
Intraosseous schwannoma (neurilemmoma) is an extremely rare, benign neoplasm, constituting less than 0.2% of primary bone tumors. It infrequently involves the bones of the hand. We present a case of intraosseous neurilemmoma of the metacarpal. Received: 26 July 1999 Revision requested: 16 August 1999 Revision received: 16 September 1999 Accepted: 4 October 1999  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