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   16128篇
  免费   1014篇
  国内免费   34篇
耳鼻咽喉   124篇
儿科学   645篇
妇产科学   390篇
基础医学   2346篇
口腔科学   201篇
临床医学   1317篇
内科学   3313篇
皮肤病学   341篇
神经病学   1811篇
特种医学   559篇
外国民族医学   4篇
外科学   2383篇
综合类   176篇
一般理论   8篇
预防医学   1123篇
眼科学   212篇
药学   884篇
中国医学   17篇
肿瘤学   1322篇
  2023年   77篇
  2022年   144篇
  2021年   310篇
  2020年   192篇
  2019年   241篇
  2018年   299篇
  2017年   255篇
  2016年   295篇
  2015年   334篇
  2014年   438篇
  2013年   543篇
  2012年   907篇
  2011年   982篇
  2010年   522篇
  2009年   491篇
  2008年   772篇
  2007年   757篇
  2006年   770篇
  2005年   843篇
  2004年   667篇
  2003年   641篇
  2002年   626篇
  2001年   437篇
  2000年   477篇
  1999年   384篇
  1998年   181篇
  1997年   152篇
  1996年   148篇
  1995年   114篇
  1994年   120篇
  1993年   108篇
  1992年   286篇
  1991年   262篇
  1990年   252篇
  1989年   280篇
  1988年   246篇
  1987年   244篇
  1986年   211篇
  1985年   224篇
  1984年   187篇
  1983年   155篇
  1982年   101篇
  1981年   100篇
  1979年   153篇
  1978年   106篇
  1976年   77篇
  1975年   72篇
  1974年   105篇
  1973年   95篇
  1972年   71篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
A case of dislodgement of a submandibular sialolith into the oropharynx during nasal intubation is presented. The deleterious effect of the patient aspirating the stone into the lungs was averted by the taking of a lateral skull radiograph and localization and removal of the sialolith.  相似文献   
52.
Potential advantages and disadvantages of dual-career relationships are identified, and strategies for addressing common issues encountered by dual-career couples are presented. With regard to career issues, clarification of expectations and discussion between partners regarding career commitment, job selection and mobility, and maintenance of professional identity is emphasized. Benefits of dual-career relationships include shared occupational interests, financial rewards, and respect for each partner's professional expertise. Strategies for managing domestic responsibilities include modifying standards, setting priorities, and distributing tasks evenly among family members. Pharmacist couples who are parents have chosen several routes in managing child-care issues, including postponing childbearing until each adult's career is established, decreasing one partner's career involvement, and hiring community or in-home caretakers. Sharing equally in child care can help prevent an excessive workload for one parent. Progressive family-oriented employment practices may also aid dual-career couples with children. Striking a balance between career and family is identified as perhaps the most challenging task facing the dual-career couple; time distribution must be adjusted according to the couple's priorities. Identifying realistic priorities, negotiating honestly regarding attainment of mutual and individual goals, and maintaining flexibility are key in achieving success in the professional and private lives of two-pharmacist couples.  相似文献   
53.
54.
A shortened latency of rapid eye movement (REM) sleep is one of the most stable biological abnormalities described in depressive patients. According to the reciprocal interaction model of non-REM and REM sleep regulation, REM sleep disinhibition at the beginning of the night in depression is a consequence of heightened central nervous system cholinergic transmitter activity in relation to aminergic transmitter activity. A recent study has indicated that muscarinic supersensitivity, rather than quantitatively enhanced cholinergic activity, may be the primary cause of REM sleep abnormalities in depression. The present study tested this hypothesis by treating healthy volunteers for 3 days with a cholinergic antagonist (scopolamine) in the morning, in an effort to induce muscarinic receptor supersensitivity. On the last day of scopolamine administration, RS 86, an orally active cholinergic agonist, was administered before bedtime to test whether this procedure would induce sleep onset REM periods. Whereas scopolamine treatment tended to advance REM sleep and to heighten REM density in healthy controls in comparison to NaCl administration, the additional cholinergic stimulation did not provoke further REM sleep disinhibition. This result underlines the need to take a hypofunction of aminergic transmitter systems into account in attempts to explain the pronounced advance of REM sleep typically seen in depressives.  相似文献   
55.
The authors performed dexamethasone suppression tests (DST), TRH infusions, 72-hour urine collections, and lumbar punctures on a group of male depressed patients. Approximately 60% of the patients were DST positive and 33% had a blunted TSH response. Two biologic variables, the 8 a.m. postdexamethasone cortisol and the postprobenecid CSF 5-hydroxyindoleacetic acid (5-HIAA), accounted for over half of the variance in the behavioral measure, the Hamilton score. Plasma cortisol elevation was associated with high 3-methoxy-4-hydroxyphenyl glycol (MHPG) excretion; TSH blunting was associated with low urinary MHPG excretion. Comprehensive biologic measures showed certain significant interrelationships and correlations with the severity of depression.  相似文献   
56.
We report 4 cases of children who developed lobar pneumonia and subsequently acute glomerulonephritis, all within a period of six weeks. In one case streptococcus pneumonia type 5 was isolated, a strain not previously described in the literature as being nephritogenic.  相似文献   
57.
58.
Chronic lead exposure may cause hypertension in normotensive rats. This hypertensinogenic effect has been attributed to perturbations in the renin-angiotensin axis, the contractile response of the vascular smooth muscle, or the intracellular Ca2+ homeostasis as a consequence of the inhibition of Na(+)-K(+)-ATPase activity. In this study we examined the short-term effect of lead exposure on blood pressure, plasma renin activity, vascular contractility, and renal Na(+)-K(+)-ATPase activity and abundance in the spontaneously hypertensive rat. Our data indicate that modest lead exposure caused blood pressure elevation within two weeks in this rat strain that is genetically susceptible to the development of hypertension. This rapid blood pressure-elevating effect did not appear to depend on the mechanisms described in hypertension associated with more chronic lead exposure listed above. This acute model provides an additional approach to the study of lead-induced hypertension.  相似文献   
59.
60.
Summary Enchondroma are benign cartilaginous tumors and are localized most often at the site of the phalanges. Between 1982 and 1993 73 patients with monostotic enchondroma and 5 patients with polyostotic enchondroma were operated at our clinic. Clinical signs of monostotic tumors were pathological fracture (38.4 %), pain or swelling. Eleven percent of cases were accidental findings. Surgical treatment was performed by complete removal of the tumors and filling the bone cavity with autologous spongiosa taken from the pelvic bones, the elbow, or the radius. Three patients (4.1 %) had to be operated a second time due to wound infections and hematoma. In one case Sudeck's dystrophy was diagnosed. One patient (1.4 %) developed a recurrent tumor. Our follow-up examination of 65 patients showed that 77 % of the patients with monostotic enchondroma achieve very good or good functional long-term results after this operation, but only 40 % of the patients with polyostotic enchondroma.   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