全文获取类型
收费全文 | 2258篇 |
免费 | 161篇 |
国内免费 | 5篇 |
专业分类
耳鼻咽喉 | 25篇 |
儿科学 | 178篇 |
妇产科学 | 43篇 |
基础医学 | 205篇 |
口腔科学 | 23篇 |
临床医学 | 168篇 |
内科学 | 539篇 |
皮肤病学 | 64篇 |
神经病学 | 231篇 |
特种医学 | 51篇 |
外国民族医学 | 1篇 |
外科学 | 303篇 |
综合类 | 60篇 |
一般理论 | 1篇 |
预防医学 | 190篇 |
眼科学 | 43篇 |
药学 | 183篇 |
中国医学 | 5篇 |
肿瘤学 | 111篇 |
出版年
2023年 | 18篇 |
2022年 | 27篇 |
2021年 | 63篇 |
2020年 | 39篇 |
2019年 | 48篇 |
2018年 | 53篇 |
2017年 | 45篇 |
2016年 | 45篇 |
2015年 | 52篇 |
2014年 | 79篇 |
2013年 | 116篇 |
2012年 | 148篇 |
2011年 | 124篇 |
2010年 | 68篇 |
2009年 | 75篇 |
2008年 | 80篇 |
2007年 | 98篇 |
2006年 | 122篇 |
2005年 | 113篇 |
2004年 | 105篇 |
2003年 | 100篇 |
2002年 | 109篇 |
2001年 | 64篇 |
2000年 | 53篇 |
1999年 | 43篇 |
1998年 | 15篇 |
1997年 | 13篇 |
1996年 | 12篇 |
1995年 | 16篇 |
1993年 | 12篇 |
1992年 | 30篇 |
1991年 | 32篇 |
1990年 | 31篇 |
1989年 | 26篇 |
1988年 | 31篇 |
1987年 | 21篇 |
1986年 | 22篇 |
1985年 | 20篇 |
1984年 | 27篇 |
1983年 | 12篇 |
1982年 | 15篇 |
1981年 | 14篇 |
1979年 | 19篇 |
1978年 | 12篇 |
1976年 | 11篇 |
1975年 | 15篇 |
1974年 | 14篇 |
1973年 | 19篇 |
1971年 | 19篇 |
1970年 | 11篇 |
排序方式: 共有2424条查询结果,搜索用时 0 毫秒
1.
H. -J. Möller H. M. van Praag B. Aufdembrinke P. Bailey T. R. E. Barnes J. Beck H. Bentsen F. X. Eich L. Farrow W. W. Fleischhacker J. Gerlach K. Grafford B. Hentschel A. Hertkorn S. Heylen Y. Lecrubier J. P. Leonard P. McKenna W. Maier V. Pedersen A. Rappard W. Rein J. Ryan M. Sloth Nielsen R. -D. Stieglitz G. Wegener J. Wilson 《Psychopharmacology》1994,115(1-2):221-228
There is little agreement about the methodology of clinical trials of antipsychotic drugs in patients with negative symptoms. A literature review revealed wide variation in experimental design, rating scales and study duration. This reflects differing views as to the definition and response to treatment of negative symptoms. Some degree of standardization would improve comparability of studies and aid the development of new compounds. Patients included in such studies should have displayed negative symptoms for at least 6 months. Depressive symptoms, positive schizophrenic symptoms and extrapyramidal signs may all influence or be confused with negative symptoms and may respond to treatment; they should be at a low level at baseline and should be measured during the study period. Studies should last at least 8 weeks. Several scales are available for measuring negative symptoms and are reviewed; a global impression score should be used additionally. 相似文献
2.
Herman M van Praag 《The world journal of biological psychiatry》2004,5(3):155-160
Stress often precedes psychiatric disorders. This holds particularly for the group of mood disorders. A crucial question is whether stress is an epiphenomenon or a decisive factor in the causation of (certain forms of) mood disorder. Certainty about this question can only be obtained when it can be demonstrated that stress phenomena may induce changes in brain functioning similar to the ones supposedly associated with (certain forms of) depression. Since the phenomenology of stress syndromes, as well as their emotional intensity, are highly variable, careful diagnosis is a first requirement. In studies into the significance of stress in the occurrence of depression this degree of finesse has not been achieved. The major shortcomings are discussed. Those should be systematically addressed to provide this type of research with the necessary acuity 相似文献
3.
4.
This communication highlights scleral dellen as an unusual complication of strabismus surgery in a 55-year-old hypertensive male. The clinical significance, differential diagnosis and management of this condition has been discussed. 相似文献
5.
Herman M. van Praag 《European neuropsychopharmacology》1992,2(4):393-404
5-HT disturbances in depression (as exemplified by lowered CSF 5-HIAA) are not syndrome specific but related to components of the depressive syndrome, specifically to increased anxiety and aggression. These 5-HT disturbances are probably core pathogenetic processes not derivative features. I hypothesized that in this subtype of depression, i.e. in “5-HT related depression”, the key psychopathological disturbances are dysregulation of anxiety and aggression, while mood lowering is a “by-product”. Based on this hypothesis it was predicted that agents which ameliorate anxiety and/or aggression via harmonization of 5-HTergic transmission will, in addition, exert overall antidepressant effect in “5-HT related depression”. The study of the relative “weight” of the various psychopathological components of depression is a basic exercise in understanding the nature of that condition and could, as such, greatly facilitate the goal-directed search for new and innovative antidepressants. 相似文献
6.
7.
This study investigated the relationship between increased serotonin (5-hydroxytryptamine, 5HT) receptor sensitivity and human aggression. A low oral dose of meta-chlorophenylpiperazine (MCPP), a postsynaptic 5HT receptor agonist, was administered in a placebo-controlled design to depressed (n = 22) and panic disorder (n = 20) patients classified with or without signs of outwardly directed aggression, patients with a history of suicide attempts (inwardly directed aggression) (n = 11), and normal controls (n = 19). Hormones under 5HT control were measured at 30-min intervals. Results were as follows: (1) MCPP did not induce or reduce anger, (2) patients with outwardly directed aggression did not have significantly greater MCPP-induced cortisol or prolactin release than did patients without signs of outwardly directed aggression, (3) patients with a history of suicide attempts did not have significantly greater MCPP-induced cortisol or prolactin release than did normal controls, and (4) MCPP-induced hormone release was unrelated to measures of aggression. 相似文献
8.
Hazards of smoking 总被引:1,自引:0,他引:1
A strong association exists between cigarette smoking and several diseases namely, cancer of the lung, bronchitis and emphysema, cancer of the larynx, oral cavity and oesophagus, gastric and duodenal ulcers, Crohn's disease, cancer of the bladder, coronary artery disease, macrocytosis, polycythaemia, leukaemia, etc. This is due to the harmful constituents of cigarette and other modalities smoking. Smokers not only harm themselves but also harm those around. Foetal malformations, abortions, stillbirths, prematurity and low birth weight are common in smoker mothers. These are the effects of passive smoking. There is no safer cigarette in the market even by lowering its harmful constituents. Mass education about the hazards of smoking with emphasis on complete stoppage of smoking is the only way to prevent its rising incidence. 相似文献
9.
Early studies suggested that newborn animals are far more susceptible to the convulsant effect of systemic morphine than adult animals. The present study reassessed morphine's (0, 6, 12.5, 25, 50, 100 and 300 mg/kg) toxic effects, making use of electroencephalographic (EEG) recordings, behavioral observations and the specific opiate antagonist naloxone in immature rats (postnatal days 1, 3, 6, 12 and 24). Although morphine had opiate-specific effects (such as inhibition of activity at low doses), non-specific effects (such as hyperactivity) elicited by the highest doses, predominated in the 3 youngest age groups. At day 12 high doses of morphine first produced Straub tail and catatonia. At this age morphine produced EEG spikes that were not reversed by naloxone. Only at day 24 were electrographic spikes temporarily inhibited by naloxone. Behavioral convulsions were never observed, at any age. These findings indicate that morphine is less toxic in newborns than suggested previously. 相似文献
10.