首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   3308篇
  免费   163篇
  国内免费   12篇
耳鼻咽喉   46篇
儿科学   252篇
妇产科学   84篇
基础医学   404篇
口腔科学   48篇
临床医学   380篇
内科学   835篇
皮肤病学   30篇
神经病学   283篇
特种医学   68篇
外国民族医学   1篇
外科学   363篇
综合类   24篇
一般理论   1篇
预防医学   262篇
眼科学   40篇
药学   164篇
中国医学   4篇
肿瘤学   194篇
  2022年   18篇
  2021年   59篇
  2020年   41篇
  2019年   47篇
  2018年   65篇
  2017年   43篇
  2016年   35篇
  2015年   49篇
  2014年   61篇
  2013年   117篇
  2012年   142篇
  2011年   147篇
  2010年   77篇
  2009年   87篇
  2008年   144篇
  2007年   172篇
  2006年   140篇
  2005年   138篇
  2004年   171篇
  2003年   137篇
  2002年   142篇
  2001年   129篇
  2000年   150篇
  1999年   120篇
  1998年   49篇
  1997年   36篇
  1996年   35篇
  1995年   15篇
  1994年   24篇
  1993年   21篇
  1992年   68篇
  1991年   68篇
  1990年   70篇
  1989年   75篇
  1988年   62篇
  1987年   70篇
  1986年   31篇
  1985年   50篇
  1984年   33篇
  1983年   38篇
  1982年   18篇
  1981年   16篇
  1979年   39篇
  1978年   26篇
  1977年   15篇
  1976年   24篇
  1974年   22篇
  1973年   21篇
  1972年   23篇
  1971年   12篇
排序方式: 共有3483条查询结果,搜索用时 15 毫秒
41.
OBJECTIVE: The aim of this paper is to examine the facets of parental satisfaction and its relationship with clinician-rated outcome in a child and adolescent mental health service. METHOD: Patients (n = 1278) consecutively assessed between 1992 and 1996 were included in the study. When treatment ended, clinicians rated the outcome of the intervention and parents were asked to complete a satisfaction questionnaire. RESULTS: Sixty-nine per cent of cases were rated by clinicians as having a positive outcome. Outpatients were more likely to be given a positive rating than inpatients. Satisfaction questionnaires were returned by 40% of parents; 76% of these were mostly or very satisfied. Satisfaction scores increased with the number of outpatient sessions attended but did not differ between inpatients and outpatients. There was a significant but small agreement (27% better than chance) between clinicians' rating of outcome and parental satisfaction. Level of agreement varied according to service provided and the number of sessions attended. While rates of positive outcome increased over the study period, ratings of satisfaction were stable. CONCLUSIONS: Overall, ratings of satisfaction were comparable with those reported in other studies. Variations in concordance between parents and clinicians show that outcome and satisfaction, although related, are different constructs influenced by different factors depending on the services provided. Focusing on specific aspects of satisfaction, as opposed to global measures, may be more useful for services, although such undertakings must be supported with efforts to improve clinical outcomes.  相似文献   
42.
Herbal remedies are commonly used for psychiatric problems, but there is virtually no data about the use of these substances by young persons or by patients in treatment. Four adolescents who used St. John's Wort while under psychiatric care are described. Three of the patients had been reluctant to reveal this to their psychiatrist, believing the doctor had no interest in alternative medicine or would disapprove. Patient beliefs that prescribed medication has limitations and that natural products are safe contributed to the use of herbal remedies. The cases raise a number of issues, including the need for clinicians to routinely ask patients about alternative medicine use, to learn more about these treatments, and to discuss these approaches objectively with patients.  相似文献   
43.
Urinary infection due to urea splitting bacteria leads to a rise in urinary pH, favouring the precipitation of calcium salts and struvita crystals. If deposited on the surface of a bladder with chronic inflammation or some other previous lesion, may produce an alkaline encrusted cystitis, now a rare condition. In the case here presented, occurred in a 69-year-old male. Corynebacterium urealyticum grown in the urine, and some foci of malakoplakia were found in the area of encrustation endoscopically excised. This case seems to be the third example of alkaline encrusted cystitis associated with malakoplakia reported in the bibliography. These two conditions share similar clinical signs and may probably have a common aetiopathogenesis.  相似文献   
44.
45.
Summary Activity of platelet monoamine oxidase (MAO) has repeatedly been reported to be associated with various forms of psychopathology. This investigation was designed to reexamine the biochemical high-risk paradigm developed by Buchsbaum et al. (1976). In 383 healthy students (193 males, 190 females) platelet MAO activity was measured. The 35 students with the lowest and 37 with the highest enzyme activities were then examined with three personality tests (16 PF of Cattell, Freiburger Persönlichkeitsinventar, Eysenck Personality Questionnaire). Furthermore, biographic data with respect to psychosocial problems were explored. There were no consistent differences between subjects with low or high platelet MAO. Therefore, we could not confirm any correlation between psychopathology and platelet MAO in this study.Supported by the Deutsche Forschungsgemeinschaft  相似文献   
46.
Summary. Twelve healthy children in three age groups anaesthetized for minor surgery were given a single oral dose of tiaprofenic acid (3 mg · kg–1) (TA). Seven blood samples and zero to 8 and 8 to 24 h urines were collected. TA concentrations in plasma and urine were measured by HPLC.No significant difference was found between the age groups in the kinetic parameters of TA and no correlation was found between these parameters and age; tmax=2.12h, Cmax=8.78mg · l–1, AUC(08 h) 33.9mg · h · l–1, AUC=39.3 mg · h · l–1, t1/2=2.35 h, Vz=0.319 l · kg–1, CL=0.094 l · h–1 · kg–1. Renal clearance was 14 ml · h–1. kg–1. 33% of the TA dose was recovered in the 24 h urine, 48% of which was conjugated, whereas in adults, TA is only found in urine as conjugates.The apparent plasma clearance was significantly higher (56%) than in 12 healthy adults given 1.5 mg · kg–1 TA. Volume of distribution and t1/2 did not significantly differ between children and adults. Since no relationship has been established between plasma TA and either efficacy or toxicity, a different dose regimen cannot be recommended in 3–11 year-old children from that in adults.  相似文献   
47.
American kestrels (Falco sparverius) were fed diets containing 3 g/g Aroclor® 1 1248 or control diets from mid-January until July. Eggs were removed from first clutches 2 to 4 days after laying ceased and shell thickness and shell dimensions were measured. Contents of the third egg of each clutch, the carcasses of all adults that received Aroclor® 1248 and of three males and three females that received the control diet were analyzed for DDE, Aroclors® 1248, 1254 and 1260, and dieldrin. Concentrations of PCBs, DDE and dieldrin were significantly higher (P < 0.03) in eggs and carcasses from treated adults than in controls. Shell thickness and shell thickness index of eggs from treated adults were reduced 5.0% (P < 0.0001) and 4.8% (P < 0.0001), respectively, from those of controls.  相似文献   
48.
    
Conclusion Malgré des défaillances occasionnelles, les observations détaillées de l'ensemble des 45 cas permettent de dire qu'il n'y a pas de relation entre les départs et la fréquence des consommations d'héoÏne antérieures au départ, telle que le montrent les analyses chimiques.Les 45 départs sont-ils des échecs? Si 1'on prend comme critères de réussite l'indépendance d'un individu par rapport à la drogue, son indépendance affective et son indépendance économique, l'absence de la relation précédente suggère qu'un certain nombre d'entre eux pourrait bien etre sorti de la dependance de la drogue au moment de leur départ, pour autant qu'ils puissent satisfaire par la suite leurs besoins économique et affectif. Le nombre d' échecs tendrait ainsi à diminuer.Sur le plan opposé, les 25 cas ayant franchi toutes les phases du programme de cure sont-ils des réussites? La difficulté de les suivre régulièrement sur une longe période incite à la réserve. Le chiffre de 36% est relativement optimiste. Ces résultats tempèrent les conclusions énoncées dans le rapport Schmidt et Delachaux (2) mais lui apportent en mÊme temps une base de justification plus solide.
Non medical treatment of heroÏn addicts and chemical analysis as an element of appreciation
Summary Group psychotherapy programme is applied in a heroÏn addiction treatment center in conjunction with a systematic planning of chemical analyses along the course of the cure. The addicts live under inspected regime. At best 25 out of 70 cases (36 %) conclude the programme with occasional and non repetitive failures. The question of their follow-up beyond their treatment period arises in order to better evaluate their retrieval.No relationship was observed between individuals who had quit the programme and the frequency of heroÏn consumptions during the time they were under treatment.

Nichtmedizinische Behandlung von Heroinomanen und chemische Analyse als Bewertungselement
Zusammenfassung In einer Anstalt zur Behandlung der Heroinsucht wurde ein gruppenpsychotherapeutisches Programm zusammen mit einer systematischen Plannung chemischer Analysen während der Behandlung durchgeführt. Die Süchtigen leben unter Uberwachung. Höchstens 25 aus 70 Fällen (36%) schlossen das Programm mit gelegentlichen und nichtwiederholten Rückfällen ab. Ihre Uberwachung nach der Behandlungsperiode als Bewertungselement ihrer Rehabilitation bleibt noch offen. Ein Zusammenhang zwischen den vom Programm abtretenden Personen und der Häufigkeit ihres Heroinverbrauches während der Behandlungsperiode konnte nicht festgestellt werden.
  相似文献   
49.
Summary Clorazepate 20mg was given i. m. to 49 mothers during the first stage of labour. The elimination of the drug was studied in 27 newborns produced by these mothers. The same dose was given to 13 women who underwent amniocentesis and to 7 women who were breast-feeding. Total nordiazepam, i.e. the sum of clorazepate and its metabolite nordiazepam, was determined by gas-liquid chromatography in maternal blood, umbilical cord blood (both arterial and venous), amniotic fluid and in milk. Clorazepate was found to cross the placental barrier slowly, but nordiazepam was transferred more rapidly. Nordiazepam was found in the milk and in the blood of neonates after breast-feeding had started.  相似文献   
50.
OBJECTIVE: This study aims to ascertain whether there were differences in family environment among patients with attention deficit hyperactivity disorder (ADHD), oppositional defiant disorder and conduct disorder. METHOD: The records of 233 patients, selected for high or low scores on a scale that taps ADHD symptoms, were reviewed by three clinicians who made DSM-IV diagnoses and rated the family environment with the Global Family Environment Scale (GFES). Self-report data obtained from the parent and child versions of the Child Behaviour Checklist were also used. The quality of the family environment was then compared between the various diagnostic groups. RESULTS: A poorer family environment was associated with conduct disorder and oppositional defiant disorder and predicted a worse outcome (e.g. admission to a non-psychiatric institution, drug and alcohol abuse). Quality of the family environment did not vary according to ADHD diagnosis or gender. CONCLUSIONS: There seems to be no association between the quality of the family environment and a diagnosis of ADHD among referred adolescents. However, there is an association with conduct disorder. Interventions that improve family environment in the early years of life may prevent the development of conduct problems.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号