全文获取类型
收费全文 | 15118篇 |
免费 | 1188篇 |
国内免费 | 155篇 |
专业分类
耳鼻咽喉 | 117篇 |
儿科学 | 590篇 |
妇产科学 | 340篇 |
基础医学 | 1890篇 |
口腔科学 | 233篇 |
临床医学 | 1758篇 |
内科学 | 3048篇 |
皮肤病学 | 471篇 |
神经病学 | 1368篇 |
特种医学 | 741篇 |
外科学 | 1864篇 |
综合类 | 374篇 |
一般理论 | 7篇 |
预防医学 | 1224篇 |
眼科学 | 262篇 |
药学 | 876篇 |
中国医学 | 4篇 |
肿瘤学 | 1294篇 |
出版年
2021年 | 168篇 |
2019年 | 190篇 |
2018年 | 214篇 |
2017年 | 166篇 |
2016年 | 185篇 |
2015年 | 204篇 |
2014年 | 274篇 |
2013年 | 433篇 |
2012年 | 567篇 |
2011年 | 638篇 |
2010年 | 360篇 |
2009年 | 377篇 |
2008年 | 598篇 |
2007年 | 653篇 |
2006年 | 582篇 |
2005年 | 632篇 |
2004年 | 548篇 |
2003年 | 515篇 |
2002年 | 515篇 |
2001年 | 495篇 |
2000年 | 526篇 |
1999年 | 450篇 |
1998年 | 258篇 |
1997年 | 240篇 |
1996年 | 214篇 |
1995年 | 207篇 |
1994年 | 197篇 |
1993年 | 160篇 |
1992年 | 378篇 |
1991年 | 381篇 |
1990年 | 393篇 |
1989年 | 380篇 |
1988年 | 298篇 |
1987年 | 324篇 |
1986年 | 337篇 |
1985年 | 332篇 |
1984年 | 213篇 |
1983年 | 250篇 |
1982年 | 141篇 |
1981年 | 110篇 |
1980年 | 112篇 |
1979年 | 206篇 |
1978年 | 148篇 |
1977年 | 138篇 |
1976年 | 151篇 |
1975年 | 140篇 |
1974年 | 145篇 |
1973年 | 136篇 |
1972年 | 107篇 |
1970年 | 120篇 |
排序方式: 共有10000条查询结果,搜索用时 8 毫秒
61.
Flexible Sigmoidoscopy Screening in an Industrial Setting 总被引:1,自引:0,他引:1
Benjamin Krevsky M.D. M.P.H. F.A.C.G. Tomasz Niewiarowski M.D. Rita League R.N. Harold Herman M.D. Lisa Matz Robert S. Fisher M.D. F.A.C.G. 《The American journal of gastroenterology》1992,87(12):1759-1762
Little is known about the yield of colorectal cancer screening programs in an industrial setting. We therefore established a flexible sigmoidoscopy screening program at a chemical manufacturing plant and offered testing to all employees over the age of 40. After a Fleet enema preparation had been administered, a digital rectal examination and sigmoidoscopy were performed on each volunteer worker in the medical office of the plant. The plant had an average census of about 650 workers; 202 were screened during a 2-yr period. The mean (+/- SEM) age of participants was 52 +/- 0.4. Sixty-four employees had polyps (31.7%); data on follow-up colonoscopy were available in 69%. Colonoscopy revealed adenomatous polyps in 23 workers (53.5%), hyperplastic polyps in 10 (23%), and no evidence of neoplasia in 10 (23%). Seven workers did not arrange for follow-up colonoscopy and 12 individuals could not be contacted. No cancers were detected. In the 40- to 50-yr age group, polyps were detected in 19.5% of employees (25% adenomatous). Incidental findings were common, and included prostatic nodules, hemorrhoids, diverticulosis, and proctitis, among others. We conclude that screening sigmoidoscopy can be conveniently and economically performed at the workplace, with a high yield and good worker acceptance. The high yield suggests a possible association between polyp formation and work in a chemical plant. The finding of adenomatous polyps in the younger patients suggests that the threshold for flexible sigmoidoscopy at age 50 needs to be reassessed. 相似文献
62.
In the absence of clinically positive regional nodes, any value of prophylactic dissection in malignant melanomas depends on accurate preoperative determination of the pathway of lymphatic drainage. We report on the use of noninvasive radionuclide lymphoscintigraphy in the determination of regional patterns of lymph node drainage in patients with melanomas. Ten patients were studied; treatment was altered by test results in 2. Eleven node groups were excised in 7 patients. There have been no metastatic melanomas found in any nodal basins not detected by lymphoscintigraphy 23 to 42 months after operation. 相似文献
63.
The results of external beam radiotherapy for clinically localized adenocarcinorna of the prostate in 448 patients treated in the period 1980–90 were reviewed. The average follow up was 4.9 years. The patients were aged 44–87 years (median 69 years) and all had histopathological evidence of adenocarcinoma by needle biopsy or transurethral resection of prostate. The histopathological grading was: 127 G1; 154 G2; 127 G3; 12 G4; 28 Gx. Clinical staging according to TNM (American Urological Association) was: 29 T0 (A2); 4 T1 (B1); 173 T2 (B2); 176 T3 (C1); 63 T4 (C2); 3 Tx. Routine surgical pelvic lymph node staging was not performed but patients had radiological (computerized tomography scan or lymphogram) nodal staging: 350 N0; 22 N1; 12 N2; 64 Nx. High energy linear accelerator external beam radiotherapy was given by multiple fields to total doses of 50–70 Gy (median 60 Gy). The majority of patients (307, 69%) was treated by a uniform policy under the care of one radiation oncologist (HM). The rates of local and distant failure at 5 years were 10% (s.e. = 2%) and 42% (s.e. = 3%), respectively. The late complication rate at 5 years was 25% (s.e. = 2%), comprising mild 16%, moderate 7% and severe 1.3%. The 5 year overall survival rate was 64% (s.e. = 2%) and the cancer-specific survival rate was 74% (s.e. = 3%). Both histological grade and clinical stage were strongly predictive of overall survival and distant failure. Only histological grade was predictive of local failure. Treatment with external beam radiotherapy for this common cancer resulted in survival and disease control rates that compare favourably with other published radiotherapy series and has been accompanied by acceptably low morbidity. 相似文献
64.
65.
66.
Histopathological Diagnosis of Partial and Complete Hydatidiform Mole in the First Trimester of Pregnancy 总被引:8,自引:0,他引:8
Neil J. Sebire Rosemary A. Fisher Helene C. Rees 《Pediatric and developmental pathology》2003,6(1):69-77
The diagnosis of molar pregnancy is a continuing diagnostic problem for many practicing histopathologists who are required
to examine specimens of products of conception, particularly since changes in gynecological management in recent years have
resulted in uterine evacuation at earlier gestations. The aim of this review is to provide practical, up-to-date, diagnostically
useful information regarding the histological diagnosis of molar disease in early pregnancy. Pathophysiological issues relevant
to molar pregnancies, such as genetic abnormalities, will be briefly summarized, but nonhistopathological aspects of molar
disease will not be covered in detail in this review. 相似文献
67.
G W Fisher 《Journal of the American Optometric Association》1988,59(8):588-589
68.
69.