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   3488008篇
  免费   284515篇
  国内免费   14560篇
耳鼻咽喉   48522篇
儿科学   107064篇
妇产科学   91352篇
基础医学   547070篇
口腔科学   96967篇
临床医学   308553篇
内科学   618477篇
皮肤病学   93085篇
神经病学   298027篇
特种医学   138936篇
外国民族医学   453篇
外科学   543652篇
综合类   107087篇
现状与发展   24篇
一般理论   2262篇
预防医学   284367篇
眼科学   79688篇
药学   243061篇
  23篇
中国医学   10349篇
肿瘤学   168064篇
  2021年   54975篇
  2020年   35099篇
  2019年   58114篇
  2018年   70969篇
  2017年   54186篇
  2016年   59973篇
  2015年   74079篇
  2014年   108303篇
  2013年   173592篇
  2012年   90176篇
  2011年   89225篇
  2010年   115599篇
  2009年   120770篇
  2008年   77119篇
  2007年   80632篇
  2006年   91502篇
  2005年   86821篇
  2004年   89028篇
  2003年   80398篇
  2002年   70712篇
  2001年   109293篇
  2000年   102401篇
  1999年   101336篇
  1998年   65238篇
  1997年   63139篇
  1996年   60658篇
  1995年   56097篇
  1994年   50335篇
  1993年   47026篇
  1992年   71717篇
  1991年   68020篇
  1990年   64995篇
  1989年   64336篇
  1988年   60216篇
  1987年   58840篇
  1986年   56328篇
  1985年   55965篇
  1984年   50484篇
  1983年   45771篇
  1982年   42318篇
  1981年   39785篇
  1980年   37628篇
  1979年   42935篇
  1978年   37353篇
  1977年   34266篇
  1976年   31033篇
  1975年   30688篇
  1974年   32404篇
  1973年   31074篇
  1972年   29501篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
992.
Type 1 diabetes is one of the commonest chronic disorders encountered in children and adolescents. When it first becomes apparent in children, approximately 20% of them have clinical and biochemical signs of ketoacidosis (DKA). In the presence of unusual clinical symptoms it is necessary to consider the possibility of associated conditions, such as coeliac disease, immunothyroiditis and Addison’s disease. Children with diabetes must be treated by a multidisciplinary team made up of paediatrician, paediatric diabetes specialist, psychologist, social worker, ophthalmologist, dietitian, nurse and diabetes counsellor, making it essential for them to be treated in regional specialised centres. They are treated in their own psychosocial environment and their families are involved in the therapy. Comprehensive, multidisciplinary treatment strategies have now made it possible for these patients to enjoy normal physical wellbeing and near-normal psychosocial development. Prevention and early treatment of of disturbances associated with diabetes remain an important concern. The fact that type 2 diabetes must now be looked for in overweight children and adolescents is a new aspect of diabetes medicine.  相似文献   
993.
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   
994.
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   
995.
996.
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   
997.
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   
998.
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   
999.
1000.
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   
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