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   9494篇
  免费   651篇
  国内免费   18篇
耳鼻咽喉   155篇
儿科学   218篇
妇产科学   180篇
基础医学   1176篇
口腔科学   185篇
临床医学   1116篇
内科学   1806篇
皮肤病学   143篇
神经病学   830篇
特种医学   230篇
外国民族医学   2篇
外科学   1408篇
综合类   135篇
一般理论   11篇
预防医学   1039篇
眼科学   220篇
药学   673篇
中国医学   12篇
肿瘤学   624篇
  2023年   58篇
  2022年   101篇
  2021年   214篇
  2020年   138篇
  2019年   189篇
  2018年   192篇
  2017年   145篇
  2016年   187篇
  2015年   213篇
  2014年   323篇
  2013年   384篇
  2012年   549篇
  2011年   528篇
  2010年   300篇
  2009年   268篇
  2008年   472篇
  2007年   432篇
  2006年   400篇
  2005年   432篇
  2004年   335篇
  2003年   335篇
  2002年   339篇
  2001年   256篇
  2000年   267篇
  1999年   259篇
  1998年   95篇
  1997年   73篇
  1996年   76篇
  1995年   82篇
  1994年   70篇
  1993年   58篇
  1992年   170篇
  1991年   146篇
  1990年   191篇
  1989年   127篇
  1988年   123篇
  1987年   128篇
  1986年   111篇
  1985年   121篇
  1984年   87篇
  1983年   74篇
  1982年   63篇
  1979年   94篇
  1978年   74篇
  1976年   51篇
  1975年   60篇
  1973年   70篇
  1972年   58篇
  1971年   54篇
  1969年   59篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
It is possible that some "postpsychotic depressions" may be a toxic effect of antipsychotic drugs. Out of a total of 94 schizophrenic patients, 28 developed a mild akinesia and 32 never developed extrapyramidal symptoms. Those who developed akinesia became less psychotic, but they also experienced a significant, although modest, increase in depression ratings. Successful treatment of the akinesia resulted in significant improvements in depression, somatic concern, anxiety, emotional withdrawal, blunted affect, and motor retardation on both physicians' and nurses' ratings. A high association between akinesia and both objectively rated and subjectively experienced sedative effect indicates that an 'akinetic depression' is not likely if the patient does not look or feel drowsy. The 32 nonakinetic patients also became less psychotic, but not more depressed.  相似文献   
62.
63.
After 40 years of communism, Hungary is a tired nation. But now an enormous task faces its government; bringing its antiquated healthcare system into line with those of western Europe. Annabelle May reports from a conference in Budapest.  相似文献   
64.
65.
The mechanisms of action and clinical applications of electric differential treatment (EDiT) and Endosan in the treatment of ovarian cysts and concomitant symptoms are reviewed. Possible mechanisms of action include an increased level of cyclic AMP, stimulation of endorphin release, anti-inflammatory action, and steroidogenesis resulting from normalization of intercellular communication. Favorable results in the clinical setting were achieved in the treatment of ovarian cysts. Treatment success was reflected in a significant reduction in overall cyst size as well as amelioration of various concomitant symptoms, including fever, chills, inflammation, and abdominal pain. EDiT and Endosan were shown to have potent analgesic and anti-inflammatory effects. No adverse effects have been reported.  相似文献   
66.
Zusammenfassung Zusätzlich wurden physikalische und chemische Untersuchungen über den Einfluß von dynamischem Interferenzstrom (DIC) auf die Knochenheilung durchgeführt, nachdem bei 24 Schwarzkopfschafen eine Querosteotomie des Radius vorgenommen worden war. Nach instabiler Osteosynthese wurde die Osteotomiezone wiederholt mit DIC verschiedener mA—Stärken behandelt. (Methodische Einzelheiten sind in Teil I beschrieben). Die Behandlung mit dynamischem Interferenzstrom führte im behandelten Gewebe zu steigenden Temperaturen, die von den mA—Stärken abhängig waren. Weiterhin wurden Zusammenhänge zwischen DIC—mA—Intensität und dem Vorkommen von Hydroxyprolin, einer kollagenspezifischen Aminosäure, nachgewiesen, welches eine erhöhte Calcifizierungsaktivität zur Folge hatte. Messungen des Calcium— und Phosphorgehaltes im neugebildeten Knochengewebe wiesen bei den mit DIC behandelten Tieren vollständige Mineralisation zu einem viel früheren Zeitpunkt als bei den unbehandelten, nach gleichem Verfahren operierten Kontrolltieren auf. Ob DIC einen spezifischen Reiz auf die Knochenneubildung heilender Knochen ausübt, ist noch nicht vollständig geklärt.
Bone healing and Dynamic Interferential Current (DIC)
Summary In the course of supplementary physical and chemical investigations of the influence ofDynamicInterferential Current (DIC) on bone healing 24 black-head sheep were subjected to transversal osteotomy of the radius. After an instable osteosynthesis the site was exposed to repeated therapy with DIC of varying mA intensity. (Methodological details are described in part 1.) DIC therapy resulted in altering the temperatures in the treated tissue, dependent on the mA intensity. Further associations were verified between DIC intensity and the occurrence of hydroxyprolin, an amino acid specific collagen, which also reflected increased calcifying activity. Measurements of the calcium and phosphorus levels in the regenerated (newly forming) bone tissue documented full mineralization in the DIC-treated animals at a much earlier date than in the untreated controls that had undergone similar operations. Whether DIC specifically stimulates osteogenesis within healing bones is still unclear.
  相似文献   
67.
Willuhn G  May S 《Planta medica》1982,46(3):153-158
From tissue cultures (callus) of the soladulcidine strain of Solanum dulcamara L. the 4,4-dimethylsterols cycloartenol, cycloartanol, 24-dihydrolanosterol, and 24-methylenecycloartanol and the sterols cholesterol, 24-methylenecholesterol, campesterol, stigmasterol, isofucosterol, and sitosterol were identified by GC and GC/MS. In the callus the sterols are present in the free form and as esters, glucosides and palmitic esters of the glucosides. The total contents and the contents of the combined forms were determined photometrically (total: 0.19% on dry weight basis, 59.4% glucosides and acylated glucosides, 4.7% esters, 35.9% free). The main fatty acids of the petrolether soluble lipids of the callus (1.78%) are palmitic-, linoleic-, and linolenic acid.  相似文献   
68.
An experiment is described in which three male volunteers, who fully understood the nature of the project, were given doses of heroin which could have led to addiction if the subjects had proved to be physiologically or psychologically vulnerable to developing a state of addiction. The experiment was discussed most carefully by the Ethics Committee of the unit where it was conducted, and the subjects were themselves the investigators. The objective was to learn about the initial stages of the adaptation to heroin, of which nothing was known as heroin addicts usually come to the doctor when the habit is firmly established. A physician, who has studied the subject of drug addiction in a special clinic, is the first commentator, the second a lawyer and the third an associate professor of social ethics. These three experts are not discussing the results or the methodology of the experiment but whether the decision of the Ethics Committe was the right one.  相似文献   
69.
70.
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