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   20825篇
  免费   996篇
  国内免费   318篇
耳鼻咽喉   485篇
儿科学   728篇
妇产科学   440篇
基础医学   796篇
口腔科学   170篇
临床医学   2265篇
内科学   2664篇
皮肤病学   730篇
神经病学   915篇
特种医学   1175篇
外国民族医学   2篇
外科学   7071篇
综合类   1811篇
现状与发展   2篇
预防医学   572篇
眼科学   446篇
药学   774篇
  32篇
中国医学   270篇
肿瘤学   791篇
  2024年   16篇
  2023年   238篇
  2022年   474篇
  2021年   763篇
  2020年   573篇
  2019年   611篇
  2018年   698篇
  2017年   618篇
  2016年   573篇
  2015年   478篇
  2014年   906篇
  2013年   979篇
  2012年   654篇
  2011年   816篇
  2010年   689篇
  2009年   666篇
  2008年   680篇
  2007年   670篇
  2006年   517篇
  2005年   454篇
  2004年   414篇
  2003年   465篇
  2002年   1285篇
  2001年   1579篇
  2000年   1808篇
  1999年   1135篇
  1998年   1096篇
  1997年   966篇
  1996年   546篇
  1995年   237篇
  1994年   116篇
  1993年   59篇
  1992年   44篇
  1991年   41篇
  1990年   25篇
  1989年   30篇
  1988年   15篇
  1987年   10篇
  1986年   7篇
  1985年   25篇
  1984年   21篇
  1983年   32篇
  1982年   19篇
  1981年   19篇
  1980年   17篇
  1979年   11篇
  1978年   7篇
  1977年   14篇
  1976年   7篇
  1975年   6篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
针式腹腔镜是新近出现的直径只有2 mm的腹腔镜设备,目前已用于普通外科、妇产科等一些疾病的治疗上.在泌尿外科方面,针式腹腔镜在肾上腺切除术、小儿隐睾固定术等手术上也得到了应用.虽然对针式腹腔镜手术的定义仍存在争议,目前2 mm的器械也尚有局限性,但其相对于传统腹腔镜有明显的优点,如损伤比传统腹腔镜手术更小、美观性更好、住院时间更短、恢复更快.针式腹腔镜将是常规腹腔镜发展的必然结果.  相似文献   
93.
Zusammenfassung Probleml?sungsstrategien zu perioperativen Prophylaxema?nahmen umfassen mehr Studienarten als Tierexperimente und kontrollierte klinische Studien. Dabei verhelfen Methoden der kognitiven Psychologie und künstlichen Intelligenz zu neuen Verfahren, um kontroverse Standpunkte in der klinischen Versorgung zu formalisieren. Der Weg vom Tierexperiment zur klinischen Indikation, mag mühevoll und beschwerlich sein, aber die Strategie hat sich bei der perioperativen Antihistaminikaprophylaxe als eine neue Form der Prophylaxe schon bew?hrt. Gerade wurde im Refresher Course der ASA, der amerikanischen Gesellschaft für An?sthesie und Intensivmedizin, diese Prophylaxe für alle US-An?sthesisten empfohlen. Mit Unterstützung durch die Deutsche Forschungsgemeinschaft (Lo 199/16-2).  相似文献   
94.
PURPOSE: The development of overall survival of a DOSAK (German-Austrian-Swiss Cooperative Group on tumours of the maxillofacial region) clinic's overall population comprising a time period of more than 20 years (1983-2004) should be assessed. At a cutoff date (January 1st, 1997), a change from a primarily surgically based to a consequent multi-modality treatment regimen was implemented. The periods of time before and after that change should be compared. METHODS AND PATIENTS: The data of the DOSAK registry entries on 1038 patients suffering from primary untreated oral and oropharyngeal carcinomas were updated with respect to follow-up and mortality data to achieve a 100% quality of follow-up. The end point (death) was reached in 67% of the overall population. Statistical analysis was carried out by the Trium Analysis Online corporation, Munich. RESULTS: The portion of female and older tumor patients increased, more than half of all tumor patients were clearly in stage IV of the disease at first referral. The portion of patients operated on persisted approximately (80%), the portion of additional treatment modalities could be increased considerably. The fact of a bony infiltration by the tumor and the operability remained highly significantly relevant for survival in multivariate analysis, despite of multi-modality treatment. The survival rate of the patients remained significantly dependent on the clinical stage of the disease in multivariate analysis but could be improved by 10% in the clinical stages II and III and in the patients who could not be operated on. All in all, the cutoff date was statistically relevant for survival in multivariate analysis, i.[Symbol: see text]e. the change in the treatment regimen had a verifiable positive effect on the survival of a unicentric overall population. CONCLUSION: Survival improvement in an overall population via change in treatment strategy is possible in relatively short time; the clinical stages II and III and the non-operable patients have the greatest benefit from a multi-modality treatment.  相似文献   
95.
腹部损伤诊治进展   总被引:10,自引:0,他引:10  
对腹部损伤能及时准确地定性、定位诊断以及及早治疗对外科医生来说是非常重要的。熟练掌握腹部损伤的诊治原则 ,对降低病死率和改善预后具有极其重要的意义。腹腔镜外科技术用于腹部损伤诊断与治疗有着令人鼓舞的前景  相似文献   
96.
Projection radiographic techniques have been used in a standardized manner for decades for the diagnosis of conditions of the foot and ankle; the indications for them and the pattern of findings useful in the initial diagnosis and monitoring of the course are generally known to clinical radiology staff. Computed tomography has been introduced as an extension of the basic procedures performed for diagnosis in the ankle and the hindfoot. In the case of complex fractures, however, specialist experience is essential. CT is an easily accessible investigative procedure and is meanwhile economical and very powerful. Magnetic resonance imaging supplements the range of investigations in special cases when there are particular problems. Microfractures, findings indicative of inflammation and/or dystrophy and, in particular questions concerning the musculoligamentous support system are the situations in which such investigations are needed. Ultrasound has an additive value vis-à-vis magnetic resonance imaging and is an easily accessible and highly effective examination procedure both for the primary diagnosis and for serial monitoring. Financial constraints in the healthcare sector are increasingly limiting purely medical indications. Regardless of this development, the retention of projection radiography, computer tomography, and magnetic resonance imaging must be demanded for the initial diagnosis in the care of foot and ankle injuries. The earliest possible implementation of all these techniques for the initial diagnosis is the first step towards effective treatment. Cafrefully chosen and, if appropriate, complementary strategies are needed for monitoring of the course and for assessment.  相似文献   
97.
Complex injuries of the foot are often overlooked, especially in the multiple injured patient, and they then lead to major loss of function. When the mechanism of injury suggests involvement of the foot, a clinical examination of the lower extremities should be included in the primary diagnostic procedures implemented in the multiply injured patient, followed by radiological examination once the patient's condition is stable. The condition of the soft tissues is of decisive importance in the prognosis of complex foot injuries, regardless of whether the damage to the foot is one component of a polytrauma or an isolated injury, which can also be life threatening. The diagnostic examinations selected should be adapted to the severity of the injuries in the particular multiply injured patient. Successful therapy involves stable internal fixation of injuries to bones and joints, though the external fixation options should be considered in the first instance, and carefully selected methods of temporary and definitive soft tissue reconstruction. The aim of treatment is the best possible reconstruction of the foot as a functional weight-bearing unit with intact soft tissue cover and a natural form. Good results can be achieved when there is close interdisciplinary cooperation between trauma (orthopedic) and plastic surgeons. Patient with severe injuries of this kind should be transferred to a trauma center as the first step toward this end.  相似文献   
98.
Because of the insecure status of knowledge about the actual pathomorphologic changes that occur in whiplash injury, the diagnosis, therapy, and expert assessment of its sequelae still present considerable problems. These are further compounded by the high incidence of this injury in Germany and the very good insurance cover the persons concerned generally have. The initial diagnostic examinations should include a detailed and well-documented clinical examination, and the most precise record possible of how the injury was sustained should be elicited. Plain X-rays are standard diagnostic procedures; functional X-rays and MRI are recommended when instability is suspected or neurological symptoms are present. The first aim of treatment must be the relief or attenuation of pain, followed by improvement of the function. Immobilization of the cervical spine by means of a Schanz collar is rather detrimental. Varied vegetative symptoms require the involvement of different specialists in the treatment at an early stage. Expert assessment for insurance purposes is complicated because the consequences of the accident cannot be objectified, and expecially because the insurance companies require differentiation between the degenerative changes that were present before the injury was sustained in many cases and the symptoms actually caused by the injury.  相似文献   
99.
目的 探讨热应激条件下对血管内皮细胞增殖的影响 ,进一步从DNA损伤后P5 3mRNA、P2 1mRNA表达改变角度探讨增殖调控的机理。方法 以建立的血管内皮细胞热应激 (4 3℃ ,2小时 )为实验模型 ,应用流式细胞仪观察热应激后血管内皮细胞株ECV30 4的细胞周期变化 ,单细胞凝胶电泳方法观察热应激对血管内皮细胞DNA的损伤 ,RT PCR检测P5 3mRNA、P2 1mRNA表达改变情况。结果 热应激可使血管内皮细胞DNA产生显著损伤 (P <0 .0 5 ) ,继而P5 3mRNA表达增高 ,并促进P2 1mRNA的上调表达 ,最终使细胞产生G1期阻滞。结论 热应激可损伤血管内皮细胞DNA ,并通过P5 3、P2 1通路抑制细胞增殖  相似文献   
100.
目的:为帮助腹腔镜胆囊手术病人掌握健康教育的知识.方法:开展了由腹腔镜手术后的病人向术前病人介绍手术感受.结果:促进术前病人对有关的健康教育知识的掌握,并能延长其术前1d晚的睡眠时间.结论:使病人更好地掌握健康宣教知识,有利于病人的治疗.  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