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   3193009篇
  免费   280500篇
  国内免费   13782篇
耳鼻咽喉   44215篇
儿科学   102171篇
妇产科学   81667篇
基础医学   513875篇
口腔科学   86731篇
临床医学   284198篇
内科学   565338篇
皮肤病学   88902篇
神经病学   277752篇
特种医学   125997篇
外国民族医学   361篇
外科学   503168篇
综合类   96709篇
现状与发展   23篇
一般理论   2180篇
预防医学   265467篇
眼科学   71914篇
药学   217165篇
  22篇
中国医学   9976篇
肿瘤学   149460篇
  2021年   55277篇
  2020年   37519篇
  2019年   63434篇
  2018年   74610篇
  2017年   58570篇
  2016年   64376篇
  2015年   78690篇
  2014年   112563篇
  2013年   177812篇
  2012年   85619篇
  2011年   84508篇
  2010年   118126篇
  2009年   121796篇
  2008年   71708篇
  2007年   73167篇
  2006年   84217篇
  2005年   80146篇
  2004年   82117篇
  2003年   73511篇
  2002年   63605篇
  2001年   89561篇
  2000年   82123篇
  1999年   85032篇
  1998年   63418篇
  1997年   61770篇
  1996年   59480篇
  1995年   54925篇
  1994年   49125篇
  1993年   45914篇
  1992年   58541篇
  1991年   55222篇
  1990年   52396篇
  1989年   51790篇
  1988年   48336篇
  1987年   47252篇
  1986年   45298篇
  1985年   45489篇
  1984年   43087篇
  1983年   39914篇
  1982年   39838篇
  1981年   37588篇
  1980年   35551篇
  1979年   35087篇
  1978年   32153篇
  1977年   29699篇
  1976年   27278篇
  1975年   25790篇
  1974年   26281篇
  1973年   25128篇
  1972年   23657篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
121.
According to the current nutritional recommendations issued by professional diabetes and nutrition associations, diabetic patients should keep to a diet consisting of 45–60% carbohydrates, 10–20% protein, and not more than 35% fat. However, not all of these nutritional recommendations are evidence based. For example, current studies show that the intake of insoluble roughage may be underrepresented. It is also possible that diabetic patients could benefit from keeping to the lower end of the recommended range for carbohydrates (45%) and the upper end of the range advised for protein (20%).  相似文献   
122.
Chronic transplant dysfunction is a complex dynamic pathogenic process. Clinically, a decrease in glomerular filtration rate (GFR) becomes apparent leading to chronic renal insufficiency and dialysis or death from cardiovascular events. Chronic transplant dysfunction can develop into a chronic alIograft nephropathy (CAN) as a specific entity with dynamic progression. CAN includes a collection of immunologic and non-immunologic factors, rejection, ischemia time, donor and recipient characteristics and toxicity of calcineurin inhibitors. Despite improvements in immunosuppression, the long-range prognosis of renal allografts has not improved. Whether modern immunosuppressive concepts with reduction or avoidance of calcineurin inhibitors and a therapy based on antimetabolites, such as mycophenolate or mTOR-inhibitors could lead to a prolongation of transplant survival, remains to be seen.  相似文献   
123.
Laparoscopic surgery has several advantages over traditional surgery because it has been shown to be less invasive. The next logical step in the evolution of minimally invasive surgery may be to eliminate all abdominal incisions. The natural orifices provide a port of entry via the gastrointestinal tract to the peritoneal cavity. This approach would require the creation of a perforation, which is considered to be a major complication of endoscopy with significant morbidity and mortality. However, there are several recent studies that have described the technical feasibility and safety of a per‐oral transgastric approach to the peritoneal cavity using conventional endoscopes. Theoretically, this approach could reduce postoperative abdominal wall pain, wound infection, hernia formation, and adhesions. This article aims to summarize the current status of transgastric surgery, currently referred to as natural orifice transluminal endoscopic surgery (NOTES), and to address some of its future challenges.  相似文献   
124.
125.
Zusammenfassung In Deutschland leiden 25% der über 70-Jährigen unter einem Diabetes mellitus. Biologisch ältere, multimorbide und in ihren Funktionen beeinträchtigte geriatrische Patienten benötigen spezielle Vorgehensweisen bei Zielplanung, Allgemeinmaßnahmen und Pharmakotherapie. Auf der Basis der vorhandenen Leitlinien werden gesicherte Erkenntnisse dargestellt und Empfehlungen zu den Besonderheiten der Therapie des geriatrischen Diabetespatienten gegeben. Besonderes Augenmerk liegt dabei auf der Interaktion von geriatrischen Syndromen und Diabetes sowie der Verbesserung der Lebensqualität.  相似文献   
126.
Background. It has been reported that gender differences in cardiovascular outcomes found in adults also are present in children who undergo surgical repair for congenital heart disease. Methods. California statewide hospital discharge data 1989–99 were used to study outcomes in children <18 years undergoing cardiac surgery. Hospital discharge data were linked to death registry data to study postdischarge death within 30 days of discharge. We used logistic regression to evaluate the effect of gender on mortality controlling for age, race and ethnicity, type of insurance, household income, date and month of surgery, type of admission, hospital case volume, and various types of procedures. Results. There were 25 402 cardiac surgery cases with 1505 in‐hospital deaths (mortality rate of 5.92%). An additional 37 deaths occurred within 30 days after hospital discharge. Crude mortality rates for males (5.99%) and females (5.84%) were not significantly different. However, fewer neonates were female and females underwent a higher proportion of low‐risk procedures than males. Logistic regression revealed that females, compared with males, had a significantly higher odds ratio (OR) for in‐hospital mortality (OR = 1.18, P < .01) and overall (up to 30 days post discharge) mortality (OR = 1.18, P < .01). The risk‐adjusted length of hospital stay was similar between females and males while charges per hospital day were slightly higher in females than males. The prevalence of Down syndrome, pulmonary hypertension, and failure to thrive were higher in females. Conclusions. Female gender is associated with an 18% higher in‐hospital and 30‐day postdischarge mortality as compared with male gender. There was no difference in length of hospital stay between males and females. The mechanism by which female gender acts as a risk factor requires further investigation.  相似文献   
127.
We report the case of a littoral‐cell angioma of the spleen, a recently described benign vascular tumour, whose imaging and pathological characteristics have been discussed only by a few authors. The diagnosis was made after elective splenectomy. The CT images, scintigraphy and histological specimens are presented, and differential diagnoses discussed.  相似文献   
128.
129.
Abstrakt Die ?ffentlich-rechtliche Bindung des Honoraranspruchs kann nicht dadurch unterlaufen werden, dass ein Vertragsarzt, zu dessen vertrags?rztlichen Pflichten die Rückzahlung überzahlten Honorars geh?rt, sich durch Gründung einer Gemeinschaftspraxis dieser Verpflichtung entzieht. (Leitsatz des Bearbeiters)  相似文献   
130.
Abstrakt Zur Frage der beruflichen Unzuverl?ssigkeit und Unwürdigkeit eines Arztes, dessen Verhalten innerhalb eines Zeitraumes von etwa zehn Jahren mehrfach als Missbrauch seiner not?rztlichen Dienstpflichten sowie seiner Pflicht zur gewissenhaften Medikation straf- und /oder heilberufsgerichtlich geahndet worden ist.  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