全文获取类型
收费全文 | 1092篇 |
免费 | 86篇 |
国内免费 | 6篇 |
专业分类
耳鼻咽喉 | 3篇 |
儿科学 | 32篇 |
妇产科学 | 6篇 |
基础医学 | 201篇 |
口腔科学 | 71篇 |
临床医学 | 106篇 |
内科学 | 212篇 |
皮肤病学 | 11篇 |
神经病学 | 146篇 |
特种医学 | 37篇 |
外科学 | 93篇 |
综合类 | 3篇 |
预防医学 | 115篇 |
眼科学 | 35篇 |
药学 | 68篇 |
中国医学 | 1篇 |
肿瘤学 | 44篇 |
出版年
2023年 | 12篇 |
2022年 | 8篇 |
2021年 | 16篇 |
2020年 | 18篇 |
2019年 | 20篇 |
2018年 | 24篇 |
2017年 | 15篇 |
2016年 | 25篇 |
2015年 | 31篇 |
2014年 | 44篇 |
2013年 | 45篇 |
2012年 | 67篇 |
2011年 | 75篇 |
2010年 | 36篇 |
2009年 | 37篇 |
2008年 | 66篇 |
2007年 | 50篇 |
2006年 | 48篇 |
2005年 | 44篇 |
2004年 | 34篇 |
2003年 | 45篇 |
2002年 | 34篇 |
2001年 | 21篇 |
2000年 | 25篇 |
1999年 | 21篇 |
1998年 | 12篇 |
1996年 | 12篇 |
1994年 | 6篇 |
1992年 | 14篇 |
1991年 | 11篇 |
1990年 | 10篇 |
1989年 | 6篇 |
1988年 | 8篇 |
1987年 | 5篇 |
1986年 | 9篇 |
1985年 | 8篇 |
1984年 | 5篇 |
1983年 | 5篇 |
1982年 | 7篇 |
1980年 | 5篇 |
1976年 | 10篇 |
1973年 | 7篇 |
1972年 | 5篇 |
1944年 | 5篇 |
1934年 | 5篇 |
1933年 | 15篇 |
1932年 | 13篇 |
1931年 | 6篇 |
1930年 | 5篇 |
1927年 | 8篇 |
排序方式: 共有1184条查询结果,搜索用时 15 毫秒
41.
42.
Bendixen H Madsen J Bay-Hansen D Boesen U Ovesen LF Bartels EM Astrup A 《Obesity research》2002,10(9):911-922
OBJECTIVE: To elucidate how frequent weight-loss attempts are made, the methods used to achieve weight loss, and the extent to which the outcome is positive. RESEARCH METHODS AND PROCEDURES: Two independent interviews were conducted in 1992 and in 1998, each with 1200 randomly selected adult subjects. Each survey was designed to ensure an equal distribution of age, gender, and geographical regions in Denmark. RESULTS: The proportion of subjects having attempted weight loss did not change from 1992 to 1998, although the prevalence of overweight and obesity increased from 1992 (overweight, 30%; obesity, 6%) to 1998 (overweight, 35%; obesity, 8%). Almost twice as many women (61%) than men (32%) had attempted weight loss (p < 0.0001). Slimming occurred more often in subjects <50 years (51%) than >50 years (39%) (p < 0.0001), although overweight and obesity were more frequent in the elderly. Over-the-counter diet pills or meal replacements were associated with a negative outcome of slimming treatment (p < 0.0001). DISCUSSION: Approximately half of all adult Danes have attempted weight loss, particularly women and individuals <50 years. This finding is inconsistent with the fact that overweight and obesity are more prevalent in men and in individuals >50 years. Changes in habitual diet and increased physical activity are the most prevalent modes of slimming, whereas the use of over-the-counter diet pills or meal replacements has decreased from 1992 to 1998. This development may have a positive impact on future body- weight-management strategies. 相似文献
43.
Long-term prognosis in malignant exophthalmos 总被引:1,自引:0,他引:1
R Riise 《Acta ophthalmologica》1970,48(4):634-643
44.
An outbreak of borderline oxacillin-resistant Staphylococcus aureus (BORSA) in a dermatological unit
Balslev U Bremmelgaard A Svejgaard E Havstreym J Westh H 《Microbial drug resistance (Larchmont, N.Y.)》2005,11(1):78-81
From February through July, 2000, there was an accumulation of mecA-negative borderline resistant Staphylococcus aureus (BORSA) in the Department of Dermatology. BORSA was isolated in 37 samples from 11 patients. The isolates were typed by antibiogram, phage type, pulsed-field gel electrophoresis (PFGE), and spa genotyping that confirmed that they were indistinguishable from one another. In May, 2000, an intervention was initiated focusing on infection control. In-patients with BORSA were discharged and antibiotic treatment was stopped, if possible. Emphasis was put on disinfection of shared utensils and individualization of previously shared creams and lotions. After the intervention, BORSA was isolated from another 3 patients before the outbreak was terminated. A case-control study was undertaken to identify possible risk factors for being a BORSA patient. Compared to the controls, the patients with BORSA had more severe skin disease, were more often hospitalized, and had more bed days. 相似文献
45.
Cooper J Kapur N Webb R Lawlor M Guthrie E Mackway-Jones K Appleby L 《The American journal of psychiatry》2005,162(2):297-303
OBJECTIVE: The purposes of this study were to estimate suicide rates up to 4 years after a deliberate self-harm episode, to investigate time-period effects on the suicide rate over the follow-up period, and to examine potential sociodemographic and clinical predictors of suicide within this cohort. METHOD: This prospective cohort study included 7,968 deliberate self-harm attendees at the emergency departments of four hospital trusts in the neighboring cities of Manchester and Salford, in northwest England, between September 1, 1997, and August 31, 2001. Suicide rates and standardized mortality ratios (SMRs) for the cohort were calculated. Potential risk factors were investigated by using Cox's proportional hazards models. RESULTS: Sixty suicides occurred in the cohort during the follow-up period. An approximately 30-fold increase in risk of suicide, compared with the general population, was observed for the whole cohort. The SMR was substantially higher for female patients than for male patients. Suicide rates were highest within the first 6 months after the index self-harm episode. The independent predictors of subsequent suicide were avoiding discovery at the time of self-harm, not living with a close relative, previous psychiatric treatment, self-mutilation, alcohol misuse, and physical health problems. CONCLUSIONS: The results highlight the importance in a suicide prevention strategy of early intervention after an episode of self-harm. Treatment should include attention to physical illness, alcohol problems, and living circumstances. Self-harm appears to confer a particularly high risk of suicide in female patients. 相似文献
46.
Jones GJ Vanderpump MP Easton M Baker DM Ball C Leenane M O'Brien H Turner N Else M Reid WM Johnson M 《Clinical medicine (London, England)》2004,4(5):427-430
This paper describes the strategy which achieved European Working Time Directive (EWTD) compliance at the Royal Free Hampstead NHS Trust in medicine and surgery. Compliance with EWTD regulations was assessed by diary card exercise, clinical care assessed through critical incident reports, electronic handover documents and nursing reports, training opportunities assessed by unit training directors, cost controls assessed by finance department analysis, and workload assessed by staff attendance on wards, in casualty and in theatres. There was a change in focus of care to a consultant-led, specialist registrar- (SpR-)driven service extending into evenings and on weekends, coupled with a move to a multi-skilled team for night cover, and to a move from traditional on-call shifts to a full shift system across both medicine and surgery. Compliance with the EWTD was achieved whilst maintaining good standards of clinical care, ensuring training opportunities for doctors in training, controlling payroll costs, removing the need for locums, and reducing workload for both junior doctors and consultants. 相似文献
47.
Hyperglycemia is a risk marker of morbidity and mortality in acute critical illness, and insulin therapy seems to be beneficial in this patient group. Whether this is true for a population of sepsis patients, as such, has not been investigated in clinical trials, but evidence from in vitro studies and experimental sepsis suggests that this may be the case. The endocrinology of septic patients is characterized by a shift in the balance between insulin and its counter-regulatory hormones favoring the latter. This leads to prominent metabolic derangements composed of high release and low use of glucose, amino acids, and free fatty acids (FFA), resulting in increased blood levels of these substrates. Circulating, proinflammatory mediators further enhance this state of global catabolism. Increased levels of glucose and FFA have distinct effects on inflammatory signaling leading to additional release of proinflammatory mediators and endothelial and neutrophil dysfunction. Insulin has the inherent capability to counteract the metabolic changes observed in septic patients. Concomitantly, insulin therapy may act as a modulator of inflammatory pathways inhibiting the unspecific, inflammatory activation caused by metabolic substrates. Given these properties, insulin could conceivably be serving a dual purpose for the benefit of septic patients. 相似文献
48.
Müller-Schweinitzer E Gilles H Grapow M Kern T Reineke D Zerkowski HR 《Journal of pineal research》2004,37(2):92-97
Reactive oxygen species (ROS) are thought to be important mediators in ischaemia/reperfusion injury following coronary vasospasm. The most ubiquitous action of melatonin is that of a free radical scavenger. Therefore, we investigated the action of melatonin by monitoring changes in the tone on ring preparations from human internal mammary arteries (IMA). In quiescent IMA rings melatonin (0.1 nm-10 microm) never elicited any change in baseline tension but 1-100 nm melatonin enhanced significantly maximal responses to noradrenaline (NA) in arteries with endothelial function. In NA (1 microm) precontracted arteries inhibition of nitric oxide (NO(*)) formation by N(G)-monomethyl-L-arginine (l-NMMA, 100 and 400 microm) eliminated 43 +/- 7 and 61 +/- 7% of the acetylcholine (ACH) effect. Melatonin (100 and 400 nm) attenuated maximal endothelium-dependent relaxant responses to ACH slightly by 23 +/- 9 and 17 +/- 9% leaving responses to direct stimulation of soluble guanylate cyclase by sodium nitroprusside unchanged. Incubation of IMA for 20 hr at 37 degrees C with 1 microg/mL lipopolysaccharide (LPS) enhanced maximal NA effects to 147 +/- 18% (n = 22, P < 0.01) whereas 50 microg/mL LPS reduced the NA maxima to 68 +/- 9% (n = 10, P < 0.01) of the control effects. The LPS-induced potentiation was completely attenuated by coincubation with melatonin (400 nm) and significantly reduced by coincubation with the thromboxane synthase inhibitor dazoxiben (10 microm). It is suggested that the LPS-induced hyperreactivity of vascular smooth muscle is mediated through enhanced release of ROS and prostanoids and that melatonin inhibits the vascular hyperreactivity through selective scavenging of ROS. 相似文献
49.
BACKGROUND: To assess if acupuncture could be a reasonable option for pain relief in labor and to look at possible effects of acupuncture on the progress of labor. METHODS: In a controlled, single blind study, 210 healthy parturients in spontaneous, active labor at term were randomly assigned to receive either real acupuncture or false acupuncture. Visual analog scale assessments were used to evaluate subjective effect on pain. The objective parameter of outcome was the need for analgesic medication in each group. RESULTS: There were significantly lower mean pain scores and significantly less need for pharmacological analgesia in the study group compared with the control group. The women given real acupuncture spent less time in active labor and needed less augmentation than the control group. CONCLUSION: The results indicate that acupuncture reduces the experience of pain in labor. A secondary outcome of acupuncture was a shorter delivery time, which mainly, if not exclusively, can be explained by the reduced need for epidural analgesia. Acupuncture may be useful for parturients who wish a nonpharmacological analgesia without side-effects. For others it could be the analgesic method of choice, with pharmacological analgesics as supplements. 相似文献
50.