全文获取类型
收费全文 | 3759005篇 |
免费 | 262507篇 |
国内免费 | 9741篇 |
专业分类
耳鼻咽喉 | 50653篇 |
儿科学 | 123908篇 |
妇产科学 | 102472篇 |
基础医学 | 528343篇 |
口腔科学 | 105597篇 |
临床医学 | 343513篇 |
内科学 | 734845篇 |
皮肤病学 | 89008篇 |
神经病学 | 305902篇 |
特种医学 | 141176篇 |
外国民族医学 | 1006篇 |
外科学 | 558020篇 |
综合类 | 78414篇 |
现状与发展 | 8篇 |
一般理论 | 1434篇 |
预防医学 | 290418篇 |
眼科学 | 86672篇 |
药学 | 274004篇 |
12篇 | |
中国医学 | 8375篇 |
肿瘤学 | 207473篇 |
出版年
2021年 | 30122篇 |
2019年 | 31192篇 |
2018年 | 45633篇 |
2017年 | 34258篇 |
2016年 | 38565篇 |
2015年 | 43599篇 |
2014年 | 59192篇 |
2013年 | 88802篇 |
2012年 | 122462篇 |
2011年 | 129136篇 |
2010年 | 76050篇 |
2009年 | 71143篇 |
2008年 | 119381篇 |
2007年 | 127198篇 |
2006年 | 128010篇 |
2005年 | 123095篇 |
2004年 | 118160篇 |
2003年 | 113303篇 |
2002年 | 109299篇 |
2001年 | 177755篇 |
2000年 | 181953篇 |
1999年 | 153184篇 |
1998年 | 43418篇 |
1997年 | 38266篇 |
1996年 | 38350篇 |
1995年 | 37156篇 |
1994年 | 33972篇 |
1993年 | 31824篇 |
1992年 | 118362篇 |
1991年 | 114081篇 |
1990年 | 110398篇 |
1989年 | 106610篇 |
1988年 | 97615篇 |
1987年 | 95541篇 |
1986年 | 89687篇 |
1985年 | 85628篇 |
1984年 | 63893篇 |
1983年 | 54222篇 |
1982年 | 31842篇 |
1979年 | 56534篇 |
1978年 | 39712篇 |
1977年 | 33849篇 |
1976年 | 31480篇 |
1975年 | 33387篇 |
1974年 | 39886篇 |
1973年 | 38154篇 |
1972年 | 35618篇 |
1971年 | 33085篇 |
1970年 | 30620篇 |
1969年 | 29288篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
991.
G Pelletier A M de Passillé M Bernier-Cardou J Morisset 《The Journal of nutrition》1987,117(10):1759-1766
In the first experiment, 52 sows, each having raised one litter, were randomly assigned to the five following groups: control (nongravid) for pregnancy (CP), 110 d pregnancy (P110), control (nongravid) for lactation (CL), 4-wk lactation with 8 (L8) and with 12 (L12) piglets. In a second experiment, 36 sows, each having raised three litters, were randomly assigned to the following groups: control group (nongravid) fed a low-energy-density, 1% tallow diet (CLED) and two lactating groups, one fed the low-energy-density diet (LLED) and one fed a high-energy-density, 10% tallow diet (LHED). At slaughter, the stomach, small and large intestine and cecum were excised, emptied and freed from fat. Lengths and pre- and post-defatting weights were measured. Portions of tissues were homogenized and analyzed for protein, pepsin, maltase, RNA and DNA. Pregnancy had no effect on the weights of the different components of the gastrointestinal tract. Liver and small intestine weights were larger in lactating sows than in the CL group. Sows nursing 12 piglets had heavier livers than those nursing 8. The fundic mucosa of the latter had higher total pepsin activity and total protein and RNA contents than that of L12 sows. LHED sows had heavier small intestine and lower total pepsin content of the fundic mucosa than LLED sows. 相似文献
992.
P M Schulz S C Schulz S C Goldberg P Ettigi R J Resnick R O Friedel 《The Journal of nervous and mental disease》1986,174(8):457-463
Relatives of 22 schizotypal probands were evaluated for lifetime psychiatric diagnoses. Forty-four (N = 44) of the 97 available relatives were interviewed directly using the Diagnostic Interview Schedule. The rates of psychiatric diagnoses were compared with those of sixty-six (N = 66) of 140 relatives of 30 depressed patients. Family history of mental illness was ascertained by the informant method on the remainder of relatives of both proband groups. The rate of depression found in the relatives of schizotypal patients was 52% in those directly interviewed and 25.7% when informants' reports on unavailable relatives are pooled with direct interview data. These rates were not significantly higher than those found for the relatives of depressed probands (34.8% by direct interview and 21% including reports from informants). The high rates of depression in the relatives of schizotypal probands may indicate that schizotypal personality is associated with affective disorder and not only with schizophrenia. However, the high rates may be due to the presence of depressive character traits in relatives, which inflate the rates of dysthymic disorder and other chronic depressive disorders in the relatives of borderline patients. 相似文献
993.
A 68 year-old woman presented with a two-week history of amaurosis fugax, ipsilateral fronto-temporal headache and jaw claudication suggesting carotid giant cell arteritis. However, this syndrome proved to be due to atherosclerosis causing complete occlusion of the external carotid artery at its origin and narrowing of the internal carotid artery. Combined external and internal carotid endarterectomy relieved the symptoms. The symptom complex of temporal arteritis may be rarely mimicked by carotid atherosclerotic occlusive disease. 相似文献
994.
995.
A V Pokrovski? P O Kazanchian G I Kuntsevich V L Buianovski? M A Vikhert 《Vestnik khirurgii imeni I. I. Grekova》1986,137(9):56-64
Results of an examination of 39 patients are described and critically assessed. An analysis of the resolving power of the method of ultrasonic angiography in pathological formations of major vessels of the neck is given. 相似文献
996.
997.
998.
999.
1000.
Nonorganic failure-to-thrive is a medical-psychological disorder reflecting lack of growth in an infant without apparent physical causes. Children who fail to thrive as infants are at high risk for developmental delays, personality problems, abuse, and death. This article focuses on environmental failure-to-thrive, describing the behavioral characteristics of the nonthriving infant and the family milieu. Aspects of early environments of NOFT infants are profiled, specific intervention strategies are discussed, and recommendations regarding the promotion of intense, consistent multi-disciplinary intervention strategies are advanced. 相似文献