全文获取类型
收费全文 | 2842篇 |
免费 | 240篇 |
国内免费 | 26篇 |
专业分类
耳鼻咽喉 | 5篇 |
儿科学 | 173篇 |
妇产科学 | 87篇 |
基础医学 | 360篇 |
口腔科学 | 45篇 |
临床医学 | 317篇 |
内科学 | 473篇 |
皮肤病学 | 60篇 |
神经病学 | 212篇 |
特种医学 | 142篇 |
外科学 | 251篇 |
综合类 | 115篇 |
一般理论 | 3篇 |
预防医学 | 194篇 |
眼科学 | 57篇 |
药学 | 205篇 |
中国医学 | 1篇 |
肿瘤学 | 408篇 |
出版年
2021年 | 26篇 |
2020年 | 18篇 |
2019年 | 20篇 |
2018年 | 43篇 |
2017年 | 34篇 |
2016年 | 37篇 |
2015年 | 44篇 |
2014年 | 66篇 |
2013年 | 116篇 |
2012年 | 91篇 |
2011年 | 93篇 |
2010年 | 88篇 |
2009年 | 66篇 |
2008年 | 83篇 |
2007年 | 98篇 |
2006年 | 100篇 |
2005年 | 118篇 |
2004年 | 108篇 |
2003年 | 104篇 |
2002年 | 67篇 |
2001年 | 83篇 |
2000年 | 76篇 |
1999年 | 79篇 |
1998年 | 76篇 |
1997年 | 74篇 |
1996年 | 59篇 |
1995年 | 41篇 |
1994年 | 49篇 |
1993年 | 54篇 |
1992年 | 51篇 |
1991年 | 54篇 |
1990年 | 72篇 |
1989年 | 95篇 |
1988年 | 66篇 |
1987年 | 67篇 |
1986年 | 62篇 |
1985年 | 43篇 |
1984年 | 51篇 |
1983年 | 38篇 |
1982年 | 28篇 |
1981年 | 31篇 |
1980年 | 22篇 |
1979年 | 19篇 |
1978年 | 32篇 |
1976年 | 26篇 |
1975年 | 17篇 |
1974年 | 26篇 |
1973年 | 21篇 |
1967年 | 16篇 |
1966年 | 16篇 |
排序方式: 共有3108条查询结果,搜索用时 15 毫秒
1.
Relationships Between Arousal-Related Moods and Episodic Tension-Type Headache: A Biopsychological Study 总被引:3,自引:0,他引:3
An exploratory study was conducted examining arousal-related moods and episodic tension-type headache. Twelve subjects meeting International Headache Society criteria for episodic tension-type headache and 12 headache-free controls recorded headache activity and mood eight times daily for 14 consecutive days. Moods were measured using the Activation-Deactivation Adjective Check List, a self-report list that subjectively represents general arousal along two dimensions of Tension and Energy. Headache subjects had higher Tension levels than controls even in the absence of pain, and greater variation in this dimension as well. Within the headache group, Tension during pain-free periods was significantly lower than when experiencing headache, and was correlated with headache activity. The results were taken to support Thayer's (1989) biopsychological model of mood and arousal, and are discussed in terms of the model's heuristic value for general arousal and headache research. 相似文献
2.
The history and epidemiology of bovine tuberculosis in cattle herds in East Sussex are described. Since 1960, following the compulsory eradication scheme for tuberculosis, the incidence of herd infection has been low. The epidemiological features of herd infection have been sporadic incidents, with only small numbers of cattle becoming infected in the majority of incidents. There was no evidence of endemic Mycobacterium bovis infection in the cattle population in East Sussex in recent years, but a low risk of infection for cattle on the South Downs, from badgers, was apparent. 相似文献
3.
HUGH F. MOLLOY F.A.C.D. ERIC LAMONT-GREGORY M.SC. CHRIS IDZIKOWSKI PH.D. F.B.PS.S. TERENCE J. RYAN D.M. F.R.C.P. 《International journal of dermatology》1993,32(9):668-672
Background. Extensive questioning of patients with a wide variety of skin disorders led to the impression that nocturnal overheating was probably an important factor in the initiation and the perpetuation of many skin disorders. Methods. In order to test the hypothesis, 12 “clean-skinned” subjects (6M/6F) aged 18 to 45 years were monitored electronically every 30 seconds during an 8 hour sleep period (2300 to 0700 hours), sleeping under a standard 10 tog duvet. Results. All the subjects were too hot by 3 to 4°C. All showed changes in their EEG patterns with reduced REM sleep, increased awakenings, and all showed changes in their sleep stage patterns. In addition, they all showed evidence of increased sweating in the “heat-sink” area. Conclusions. The mechanisms where by such changes could be implicated in the precipitation and perpetuation of skin disease are discussed. “Lifestyle” modification as a very effective, noninvasive, therapeutic regime is recommended. Further research along these lines would probably be very valuable and instructive. 相似文献
4.
5.
6.
7.
Ten thrombocytopenic patients (platelets < 10–24 × 10(9)/L) who were refractory to platelet transfusion were investigated for their responsiveness to staphylococcal protein A column therapy. Nine patients had previously been treated with steroids, intravenous immune globulin, and/or other forms of immunosuppressive therapy without improvement in their transfusion response. All patients were receiving multiple platelet transfusions without achieving 1-hour corrected count increments (CCIs) > or = 7500. Eight patients had antibodies that reacted with platelets and were directed against HLA class I antigens, ABO antigens, and/or platelet-specific alloantigens. Plasma (500-2000 mL) from each patient was passed over a protein A silica gel column and then returned to the patient. Patients received from 1 to 14 treatments. A positive response to protein A therapy was defined as at least a doubling of the pretreatment platelet count and/or two successive 10- to 120-minute posttransfusion CCIs > or = 7500. Following plasma treatments, 6 of 10 patients responded with daily platelet counts that averaged 48 +/− 11 × 10(9) per L as compared with counts of 16 +/− 7 × 10(9) per L (p < 0.0005) before treatment. Posttransfusion CCI values determined in four of these patients averaged 2480 +/− 810 and 10,010 +/− 3540 (p < 0.005) before and after treatment, respectively. In contrast, among the four unresponsive patients, platelet counts averaged 10 +/− 9 and 13 +/− 10 × 10(9) per L (p = NS), respectively, while posttransfusion CCIs were 700 +/− 1410 and 1520 +/− 2460 (p = NS), respectively.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
8.
Medial border of the perirenal space: CT and anatomic correlation 总被引:11,自引:0,他引:11
9.
10.
C W Pritchard 《Journal of epidemiology and community health》1994,48(4):377-382
OBJECTIVE--The aim was to examine the association between depressive symptoms and smoking in pregnancy and to investigate the part played by social and psychosocial factors. SETTING--A single Glasgow hospital. DESIGN--Prospective survey by postal questionnaires at 20 and 30 weeks' gestation. PARTICIPANTS--A total of 395 women (69% of the 572 eligible) parity 1 who booked for delivery between November 1988 and February 1990 took part. MEASUREMENTS--Depressive symptoms were measured using the Hospital Anxiety and Depression Scale. Smoking was self reported. The Life Events Inventory and measures of role specific strain and stress in domestic roles were used to assess psychosocial well being. MAIN RESULTS--Smokers were more likely than non-smokers to experience depressive symptoms at 20 and 30 weeks' gestation and on both occasions. The excess risk remained substantial and significant after adjustment for social and psychosocial factors. CONCLUSIONS--Smoking is a significant risk factor for depression in pregnancy. The association of smoking with depression and psychosocial difficulty represents a major problem for interventions intended to reduce smoking in pregnancy. 相似文献