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   83450篇
  免费   8222篇
  国内免费   218篇
耳鼻咽喉   1182篇
儿科学   2527篇
妇产科学   1788篇
基础医学   11908篇
口腔科学   2021篇
临床医学   10215篇
内科学   14725篇
皮肤病学   1318篇
神经病学   6745篇
特种医学   3009篇
外国民族医学   10篇
外科学   11435篇
综合类   1716篇
一般理论   67篇
预防医学   9496篇
眼科学   1855篇
药学   6838篇
  1篇
中国医学   77篇
肿瘤学   4957篇
  2021年   1122篇
  2020年   740篇
  2019年   1120篇
  2018年   1397篇
  2017年   1007篇
  2016年   1098篇
  2015年   1248篇
  2014年   1644篇
  2013年   2576篇
  2012年   3466篇
  2011年   3747篇
  2010年   1998篇
  2009年   1930篇
  2008年   3232篇
  2007年   3575篇
  2006年   3426篇
  2005年   3500篇
  2004年   3254篇
  2003年   3029篇
  2002年   2963篇
  2001年   2736篇
  2000年   2835篇
  1999年   2523篇
  1998年   1117篇
  1997年   934篇
  1996年   917篇
  1995年   831篇
  1994年   836篇
  1993年   775篇
  1992年   2106篇
  1991年   2036篇
  1990年   1913篇
  1989年   1901篇
  1988年   1798篇
  1987年   1805篇
  1986年   1695篇
  1985年   1681篇
  1984年   1396篇
  1983年   1261篇
  1982年   851篇
  1981年   731篇
  1980年   652篇
  1979年   1223篇
  1978年   876篇
  1977年   773篇
  1976年   724篇
  1975年   720篇
  1974年   859篇
  1973年   752篇
  1972年   733篇
排序方式: 共有10000条查询结果,搜索用时 3 毫秒
51.
Smith Kevin C.  BA  BSc  MD  FACP  FRCPC    Melnychuk Michael  BSc  DDS 《Dermatologic surgery》2005,31(S4):1635-1637
Background. Injection of filler substances into the lips is painful, and many patients also find the injection of local or regional anesthesia into the lips painful.
Objective. To develop a highly effective and painless form of anesthesia to facilitate injection of filler substances into the lips.
Methods. Five percent lidocaine cream was applied simultaneously to the skin, vermilion, and mucosa of the lips (with the use of a barrier to keep the cream in contact with the mucosa and out of the rest of the mouth) for 20 to 30 minutes.
Results. Profound anesthesia of the lips was reliably produced, with no complications.
Conclusions. This "anesthetic cream block" is easier to perform and better tolerated than injectable anesthetics. Use of this technique is likely to expand the range of physicians who perform filler injections on the lips and will probably also expand the range of patients who wish to have filler injections done on their lips and who (because they had little or no discomfort) are willing to return for additional filler injections in the future.  相似文献   
52.
Two patients with angiolymphoid hyperplasia with eosinophilia isolated to the orbit had eyelid swelling, a superior orbital mass, and histories of intermittent obstructive airway disease. One patient later developed a transient peripheral blood eosinophilia as high as 36%. One lesion recurred 38 months postoperatively and responded to systemic corticosteroid therapy.  相似文献   
53.
Repeated administration of the antimanic drug lithium (4 mEq/kg/day for 2, 4 or 6 days, i.p.) to rats produced a progressive decline and eventual depletion of dynorphin-A (1-8) (DYN) concentration whereas Met5-enkephalin (ENK) was only marginally decreased in the neurointermediate lobe of the pituitary (NIL). Administration of a neuroleptic haloperidol neither affected ENK and DYN levels nor influenced lithium-induced changes. The study reveals that lithium produces a preferential perturbation in the dynorphin system relative to the enkephalin system. These results taken together with other evidence, indicate that dynorphin is possibly coreleased with vasopressin following lithium administration and provide a pharmacological support to the previously described colocalization and corelease of these endogenous peptides in the NIL.  相似文献   
54.
The ameloblastoma is a tumor arising predominantly in the mandible from odontogenic epithelium, and is locally invasive. It is rarely malignant; but even when benign, it causes gross local destruction and expansion of tissue. Growth is persistent, and recurrence may occur more than a decade after presumed total resection. Surgical resection should include a reasonable margin of healthy tissue whenever possible. Late patient presentation due to a paucity of symptoms, and insiduous tumor growth patterns render complete removal of the ameloblastoma difficult. Follow-up examinations should span a prolonged period, exceeding 10-15 years.  相似文献   
55.
Unemployment is over three million in Britain, and unemployment is known to be associated with poor health. It has been suggested that health authorities should produce a comprehensive response to the health problems caused by unemployment, and a survey was undertaken to find how many had done so. All the regional and district health authorities in England, the health boards of Wales, Scotland, and Northern Ireland, and the family practitioner committees of England and Wales were asked by letter what they were doing to respond to the health problems of unemployment. A list of suggestions of what they might be doing was enclosed. The overall response rate was 77% (255/331), and 50% (127/255) of the respondents were doing something--33.3% (3/9) of the regional health authorities, 64% (101/158) of the district health authorities and health boards, and 26% (23/88) of the family practitioner committees. The paper describes what they were doing. A relation was sought between the level of unemployment in an area and the extent of the response, and a significant association was found. Half of Britain's health authorities are now responding in some way to the health problems associated with unemployment.  相似文献   
56.
The purpose of this qualitative study was to examine the process of transformation of personal beliefs, values, feelings, and knowledge (meaning perspectives) underlying occupational change in a small group of clients with rheumatoid arthritis during home-based rehabilitation. A grounded theory approach used to collect and analyze data concurrently included: (1) a sample of five adult clients diagnosed with rheumatoid arthritis in occupational therapy, (2) data collection through 28 semi-directed interviews, and (3) data analysis using the constant comparison method. The study identified meaning perspectives of these clients with rheumatoid arthritis and explored the transformation of perspectives related to the modification of occupational performance. The study suggests that the exploration of meaning perspective transformation by clients and therapists could be a potential part of rehabilitation intervention.  相似文献   
57.
Trace element status in multiple sclerosis   总被引:1,自引:0,他引:1  
We compared trace element status in multiple sclerosis (MS) patients (n = 27) with and without treatment with corticosteroids and groups of healthy subjects. Concentrations of plasma ceruloplasmin, selenium, and zinc and erythrocyte (RBC) glutathione peroxidase, Se, and Zn were similar in all groups. RBC copper concentrations were significantly lower in MS patients than in control subjects (mean +/- SEM: 0.048 +/- 0.005 vs 0.060 +/- 0.002 mumol/g Hb) because of decreased RBC Cu with steroid therapy. RBC Zn-Cu ratios were significantly higher (14.9 +/- 1.0 vs 10.1 +/- 0.3) in MS patients than in control subjects, differing in both groups of MS patients. In MS and control subjects, RBC Cu correlated significantly with RBC Zn (r = 0.56, 0.49). Disease acuity and disability had no effect on trace-mineral status. These data suggest that in MS there is altered Cu and Zn homeostasis that may cause or result from the disease and is influenced by corticosteroid therapy. Systemic trace element alterations might provide clinically useful markers of MS.  相似文献   
58.
A case of poisoning with 100 mg of oxybutynin in a 34-year-old female is reported. The main features were anticholinergic effects, including stupor, followed by disorientation and agitation on awakening, dilated pupils, dry skin and retention of urine. She had a sinus tachycardia which resolved 3 h after admission, and in addition ventricular ectopics and bigeminy which continued for a further 30 h. She recovered fully on symptomatic treatment alone.  相似文献   
59.
The emergence of a near-haploid clone of cells in blast phase chronic myelogenous leukemia is an unusual event. We report such a case and review eight other cases described in the English literature. The significance of the substantial loss of genetic material is discussed as is the phenotypic and genotypic heterogeneity observed in this group of patients.  相似文献   
60.
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