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   1695篇
  免费   117篇
  国内免费   9篇
耳鼻咽喉   10篇
儿科学   24篇
妇产科学   49篇
基础医学   217篇
口腔科学   9篇
临床医学   158篇
内科学   393篇
皮肤病学   18篇
神经病学   309篇
特种医学   25篇
外科学   169篇
综合类   5篇
一般理论   1篇
预防医学   116篇
眼科学   34篇
药学   81篇
中国医学   3篇
肿瘤学   200篇
  2022年   20篇
  2021年   45篇
  2020年   13篇
  2019年   23篇
  2018年   41篇
  2017年   31篇
  2016年   29篇
  2015年   37篇
  2014年   53篇
  2013年   57篇
  2012年   83篇
  2011年   112篇
  2010年   51篇
  2009年   66篇
  2008年   89篇
  2007年   92篇
  2006年   90篇
  2005年   70篇
  2004年   57篇
  2003年   77篇
  2002年   71篇
  2001年   36篇
  2000年   22篇
  1999年   34篇
  1998年   15篇
  1997年   15篇
  1996年   13篇
  1994年   15篇
  1993年   18篇
  1992年   23篇
  1991年   26篇
  1990年   29篇
  1989年   21篇
  1988年   22篇
  1987年   28篇
  1986年   24篇
  1985年   18篇
  1984年   13篇
  1983年   18篇
  1981年   12篇
  1979年   17篇
  1978年   12篇
  1976年   17篇
  1975年   11篇
  1974年   13篇
  1973年   11篇
  1972年   12篇
  1971年   11篇
  1970年   13篇
  1969年   16篇
排序方式: 共有1821条查询结果,搜索用时 15 毫秒
101.
102.
103.
Twenty-one patients classified as “high-risk” problems were observed to assess fetal well-being, size, and growth with repeated plasma estriol and ultrasonographic measurements. Estriol levels were of value in the estimation of the fetal condition if fetal size and age were known. When serial plasma estriol measurements and ultrasonographic cephalometry are used together, the fetal well-being, size, and growth may be more accurately assessed and the risk of prematurity greatly reduced. Further combined studies are needed to clarify the relative values of estriol levels and ultrasonography in the assessment of fetal status. The cirteria of normal fetal growth and welfare in high-risk situations must be established in an effort to decrease high perinatal loss rates.  相似文献   
104.
105.
Neurochemical imaging studies can identify molecular targets of abused drugs and link them to the underlying pathology associated with behaviors such as drug dependence, addiction and withdrawal. positron emission tomography (PET) is opening new avenues for the investigation of the neurochemical disturbances underlying drug abuse and addiction and the in vivo mechanisms by which medications might ameliorate these conditions. PET can identify vulnerable human populations, treatment strategies and monitor treatment efficacy. Thus, with this tool and the knowledge it provides, the potential for developing novel drugs and treatment strategies for drug addiction is now close at hand.  相似文献   
106.
ZusammenfassungFragestellung. Das Ziel dieser prospektiven Untersuchung bestand in dem Vergleich der Frühergebnisse von 2 verschiedenen Behandlungsstrategien bei diaphysären Klavikulafrakturen des Typs A und B der OTA-Klassifikation.Methoden. In der 1. Gruppe wurden 27 Patienten konservativ im Rucksackverband behandelt, in der 2. Gruppe wurde die Fraktur bei 26 Patienten minimal-invasiv mit einem elastischen Titannagel intramedullär geschient. In einem Zeitraum von 6 Monaten wurden die Ergebnisse der Behandlung zu 7 Zeitpunkten evaluiert.Ergebnisse. Während des gesamten Untersuchungszeitraums konnten signifikant bessere Ergebnisse hinsichtlich der Schulterfunktion, des Constant-Score, des DASH-Score, der subjektiven Zufriedenheit, der subjektiven Schmerzempfindung und des kosmetischen Ergebnisses festgestellt werden. Die Dauer der Arbeitsunfähigkeit war in der Gruppe der operierten Patienten um mehr als die Hälfte kürzer.Schlussfolgerung. Die elastisch stabile intramedulläre Osteosynthese der diaphysären Klavikulafraktur ist ein sicheres, minimal-invasives Verfahren, das funktionell und kosmetisch in der Frühphase nicht zu schlechteren Ergebnissen führt als die konservative Therapie mit dem Rucksackverband.  相似文献   
107.
Summary GFAP, Factor VIII/RAg, laminin, and fibronectin were immunohistochemically investigated in 15 glioblastomas and 15 gliosarcomas. GFAP was found variably positive in the glial areas. F VIII/RAg characterizes the endothelial cells and in gliosarcomas suggests the origin of the sarcomatous component from the endothelial proliferations. Laminin separates the two components and characterizes the inner and the outer basement membranes in the vessels. It is multiplied and thickened in endothelial proliferations, while it is often fragmented in the larger vessel wall proliferations. Our observations confirm that gliosarcoma represents the last stage of a process which starts with the endothelial hyperplasia of glioblastoma.Partially supported by CNR, Special Project Center, Grant no. 82.00410.96  相似文献   
108.
Prognosis and clinical varieties of ALS disease   总被引:1,自引:0,他引:1  
210 cases of ALS disease in the period 1955–1979 are considered. Different parameters such as sex, age, duration and clinical course have been correlated with four clinical types: conventional, pseudopolyneuritic, pyramidal and bulbar. The age distribution shows a peak in the fifth decade of life. The sex ratio is 2.08∶1. Considering together all the clinical types, the mean duration of the disease is 27.05 months. The bulbar variety has the poorest prognosis (19.6 months) and the pyramidal variety the best (37.59 months). Familiarity is evidenced in only 3 cases. All our data are discussed and compared with those of the literature.
Sommario Sono stati considerati 210 casi di Sclerosi Laterale Amiotrofica nel periodo dal 1955 al 1979. Sono stati messi in relazione ai 4 tipi clinici della malattia: tipo convenzionale, pseudopolinevritico, piramidale e bulbare, vari parametri quali sesso, età, durata e decorso clinico. La distribuzione per età mostra un picco di incidenza nella 5a decade di vita. Il rapporto maschi/femmine è di 2,08∶1. La durata mediana di malattia per tutti i 4 tipi è di 27,05 mesi. La varietà bulbare ha la prognosi peggiore (19,6 mesi) mentre quella piramidale ha la prognosi migliore (37,59 mesi). Solamente in 3 casi è stata messa in evidenza una storia familiare. Tutti i nostri dati sono discussi e confrontati con quelli della letteraura.
  相似文献   
109.
The records of 65 consecutive patients discharged from the hospital with a diagnosis of primary parenchymal neoplasm of the kidney were reviewed. Four of the 65 patients had neoplasms which were not detected by excretory urography. The 4 undetected lesions included 3 renal cell carcinomas and 1 oncocytoma. All of these lesions projected from the anterior or posterior surface of the kidney, and all 4 were clearly demonstrated by computed tomography. Normal findings on an excretory urogram do not completely exclude a neoplasm of the kidney. When there is strong clinical suspicion of a renal neoplasm, computed tomography should be the initial examination or should be done even if the urogram has shown normal findings.  相似文献   
110.
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