全文获取类型
收费全文 | 18312篇 |
免费 | 1605篇 |
国内免费 | 245篇 |
专业分类
耳鼻咽喉 | 46篇 |
儿科学 | 948篇 |
妇产科学 | 346篇 |
基础医学 | 2545篇 |
口腔科学 | 183篇 |
临床医学 | 4451篇 |
内科学 | 814篇 |
皮肤病学 | 47篇 |
神经病学 | 4270篇 |
特种医学 | 196篇 |
外科学 | 488篇 |
综合类 | 1471篇 |
现状与发展 | 1篇 |
一般理论 | 9篇 |
预防医学 | 3267篇 |
眼科学 | 56篇 |
药学 | 609篇 |
12篇 | |
中国医学 | 232篇 |
肿瘤学 | 171篇 |
出版年
2024年 | 81篇 |
2023年 | 597篇 |
2022年 | 493篇 |
2021年 | 776篇 |
2020年 | 832篇 |
2019年 | 814篇 |
2018年 | 721篇 |
2017年 | 729篇 |
2016年 | 666篇 |
2015年 | 712篇 |
2014年 | 936篇 |
2013年 | 1575篇 |
2012年 | 833篇 |
2011年 | 883篇 |
2010年 | 702篇 |
2009年 | 771篇 |
2008年 | 811篇 |
2007年 | 891篇 |
2006年 | 733篇 |
2005年 | 648篇 |
2004年 | 618篇 |
2003年 | 521篇 |
2002年 | 453篇 |
2001年 | 343篇 |
2000年 | 289篇 |
1999年 | 283篇 |
1998年 | 294篇 |
1997年 | 233篇 |
1996年 | 229篇 |
1995年 | 173篇 |
1994年 | 156篇 |
1993年 | 170篇 |
1992年 | 127篇 |
1991年 | 123篇 |
1990年 | 87篇 |
1989年 | 82篇 |
1988年 | 89篇 |
1987年 | 90篇 |
1986年 | 75篇 |
1985年 | 71篇 |
1984年 | 82篇 |
1983年 | 39篇 |
1982年 | 64篇 |
1981年 | 60篇 |
1980年 | 48篇 |
1979年 | 41篇 |
1978年 | 23篇 |
1977年 | 30篇 |
1976年 | 18篇 |
1974年 | 10篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Psychiatric aspects of Down's syndrome 总被引:3,自引:0,他引:3
J Lund 《Acta psychiatrica Scandinavica》1988,78(3):369-374
In a survey study of psychiatric morbidity, based on a representative sample from the Danish mental retardation register, 44 adults with Down's syndrome (DS) were compared with 258 other mentally retarded adults. Assessed by the parameters psychiatric disorder, behaviour problems, neurotic traits, and deviant social interaction, the DS group functioned better on all parameters. However, male and female DS patients were very different, the females constituting a superior well-functioning group while the males had major problems in every area. High prevalence rates of dementia and infantile autism were found in the DS group. General function rapidly decreased with age in DS patients. 相似文献
22.
This study, which was carried out as part of the TURVA project on psychosocial adaptation in old age, is concerned with the significance of social support to people approaching retirement age. The population consisted of 200 urban dwellers and 189 rural dwellers, who were studied at the age of 62. The subjects were either about to retire in the near future or had already retired, and it was assumed that this event causes a certain amount of stress, which may lead to mental disturbance regardless of the amount of social support available to the individual. Intimate relationship and close friendship served as the measures of social support. Mental disturbances were assessed on the basis of the General Health Questionnaire (36-item version) and the number of psychic and especially depressive symptoms. The prevalence of mental disturbance and depressive symptoms was lowest in those people who lived in a close marital relationship and who also described their spouse as empathic. Psychic symptoms were most common in those people who said their relationship to their spouse was distant and who described them as unempathic. The subjects who were not married fell in-between these 2 groups regardless of whether they had an intimate relationship with someone of the opposite sex. A positive marital relationship seemed to provide a shield against depression, while a negative marital relationship tended to make the individual more vulnerable to depression. The role of a close non-marital friendship depended on the respondent's sex. In women, it was associated with a high prevalence of depressive symptoms.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
23.
This paper presents results of an in vitro investigation of the optical anisotropy of the human cornea. Computer controlled imaging polarimetry and the Jones formalism were used to investigate the distribution of the birefringence and the azimuth angle across the surface of 12 corneas taken from the corneal bank. Each map of the birefringence and the azimuth angle has no rotational symmetry and is different for each cornea. The minimal value of the birefringence always appears in the corneal centre and varies from 9 to 43 degrees for different corneas. Birefringence of the cornea increases monotonically more than one order in the direction of the corneal periphery. Close to the centre of the cornea the azimuth angle is almost constant and varies significantly away from the optical part of the cornea. 相似文献
24.
Mark A. Bullimore Bernard Gilmartin 《Documenta ophthalmologica. Advances in ophthalmology》1988,69(4):385-397
The accommodative response of 12 emmetropic subjects was measured for an array of numbers located at -1,-3 and -5 dioptres using an objective infra-red optometer. Responses were compared for passive (reading numbers) and active (adding numbers) conditions. The imposition of mental effort induced a significant increase in mean response for the -1 D stimulus, a response equivalent to the passive condition at -3 D and a reduction in response at -5 D. Mental effort induced similar responses for the -1 D and -3 D locations when sympathetic innervation to the ciliary muscle was blocked with the beta-receptor antagonist timolol maleate. Responses for the -5 D location were, however, significantly increased. It is proposed that sympathetic inhibition can modify the effect of mental effort on near accommodative responses. 相似文献
25.
ChanMA RMN DipN PGCEA Head of Mental Health & RudmanMA RMN RCNT DipNEd Tutor 《Journal of psychiatric and mental health nursing》1998,5(2):143-146
Debate about the best paradigm for mental health nursing is compounded by threats from mainstreaming and genericism. In nursing education, integrated practice may have been devalued in a matrix of reductionist disciplines. The 'gendered' nature of professional knowledge may create a schismatic and self-defeating attitude in nurses. Conversely, nurses may be exhorted to adopt a 'male' paradigm in order to gain academic credibility, in which the caring dimension may be lost. Other polarities such as ideological distinctions between treatment in hospital and care in the community lead to conceptual confusion. These schisms in care are detrimental to both professionals and users. The writers argue that these tensions may be addressed in an 'androgenous' model which presents a challenge to both value systems, rejects the dominance of schismatic models, and offers the potential for a new professional integrity. 相似文献
26.
Mono- or Polypharmacotherapy in Institutionalized Epileptic Children with Severe Mental Retardation?
ABSTRACT. Nine severely mentally retarded patients with severe epilepsy who were living in an institution were studied during a three-year period by a multi-disciplinary team. A seizure rate serum level chart was made for each patient. It served as the basis for monthly discussions in the team about medication changes. Drug plasma concentrations were monitored monthly. Statistical comparisons between seizure frequency on different drug regimens were made by χ2 test. Withdrawal of all medication was possible in one case and reduction to monotherapy in two cases. In the remainder of the patients a combination of two or three anticonvulsants gave the best clinical effect. We thus found polypharmacotherapy necessary for some severely retarded patients with epilepsy. Our multidisciplinary approach and chart monitoring system has many advantages and is valuable for the medical care and drug treatment of this patient category. 相似文献
27.
Kent Burnett Gail Ironson Charles Benight Christina Wynings Debra Greenwood Charles S. Carver Dean Cruess Andrew Baum Neil Schneiderman 《Journal of traumatic stress》1997,10(4):673-681
The purpose of this study was to develop and evaluate a measure of perceived disruption during rebuilding following a disaster. Two eight-item scales, which measured intensity of disruption during the entire repair phase (Intensity-RP) and intensity of disruption during the past month (Intensity-PM) were developed and administered to 135 survivors of Hurricane Andrew. At 9 to 12 months postdisaster, Intensity-RP and Intensity-PM were both significantly associated with scores on the Global Severity Index of the SCL-90-R, and with scores on the Impact of Event-Intrusion Scale; Intensity-PM alone was significantly associated with PTSD scores. Regression analyses indicated that each scale contributed significant unique variance in predicting mental health symptoms, even after controlling for relevant demographic and initial disaster exposure variables. 相似文献
28.
Yoshihiko Tsuji Hiroaki Ohue Hiroshi Ikuta Osamu Kinoshita Fumio Shibagaki 《Surgery today》1997,27(5):387-391
Between January 1985 and September 1994, 21 patients with psychiatric disorders underwent various forms of surgery at our
hospital. There were 12 men and 9 women with an average age of 57.6 years. The coexisting psychiatric disorders were schizophrenia
in 15 patients, depression in 2, dementia in 2, mental retardation with epilepsy in 1, and Parkinson's disease in 1. All the
patients had been receiving neuroleptic medications for a long period. The indications for surgery were: cholelithiasis in
6 patients, acute appendicitis in 4, perforation of the small intestine in 3, incarceration of an inguinal hernia in 2, and
esophageal cancer, stomach cancer, bleeding from a gastric ulcer, perforation of a duodenal ulcer, strangulating ileus, and
burns in 1 patient each, respectively. All of the patients who underwent elective surgery were given epidural anesthesia with
or without general anesthesia. Antipsychotic medications were given until just prior to surgery and recommenced concurrent
with the first meal. Abnormal behavior was observed in 11 patients (52.4%) postoperatively, but all the patients were discharged
in accordance with recovery from their surgical disorder. Intra- and postoperative hypotension resistant to intravenous catecholamine
administration was recognized in 9 patients (42.9%), and this peculiar complication should be borne in mind when patients
with psychiatric disorders require surgical management.
Presented at the 94th annual meeting of the Japanese Surgical Society, held in Tokyo in March, 1994 相似文献
29.
A follow-up investigation of 24 patients with hereditary spasticity in a geographically isolated northern Swedish population, first examined by Böök (1953), was performed. Fifteen of them were dead. During the period from 1950–1972 five new cases of spastic syndromes were diagnosed in this population. The patterns of clinical symptoms and the genetic associations between the new and 24 previously reported patients with spastic syndromes were analyzed. Three of the five new cases had a specific syndrome. This starts in the first years of life with ataxia, which is followed by dysarthria, spasticity and jerky intention tremor. Initially the patients are mentally normal, but there seems to be slight mental deterioration through the years. The disorder is a progressive spinocerebellar degeneration with autosomal recessive inheritance. 相似文献
30.
In order to elucidate the psychiatric comorbidity of patients in alcohol and other substance use disorder treatment we examined a representative sample of such patients in Iceland (249 men and 102 women). Over 70% of pure alcoholics and over 90% of polysubstance users had comorbid diagnoses, a prevalence higher than in the Epidemiological Catchment Area study in the United States, but similar to clinical studies from North America. The most prevalent disorders were: affective (33%), anxiety (65%), antisocial personality disorder (28%) and psychosexual dysfunction (20%). Pure alcoholics and polysubstance users in studies on psychiatric comorbidity should be separated. Anxiety and affective disorders influence treatment seeking. Findings concerning the impact of psychiatric comorbidity on course should be comparable between North America and Europe. 相似文献