全文获取类型
收费全文 | 3551篇 |
免费 | 255篇 |
国内免费 | 30篇 |
专业分类
耳鼻咽喉 | 10篇 |
儿科学 | 142篇 |
妇产科学 | 37篇 |
基础医学 | 637篇 |
口腔科学 | 100篇 |
临床医学 | 383篇 |
内科学 | 718篇 |
皮肤病学 | 120篇 |
神经病学 | 133篇 |
特种医学 | 334篇 |
外科学 | 469篇 |
综合类 | 71篇 |
预防医学 | 230篇 |
眼科学 | 77篇 |
药学 | 252篇 |
中国医学 | 1篇 |
肿瘤学 | 122篇 |
出版年
2018年 | 37篇 |
2016年 | 35篇 |
2015年 | 35篇 |
2014年 | 50篇 |
2013年 | 102篇 |
2012年 | 72篇 |
2011年 | 87篇 |
2010年 | 91篇 |
2009年 | 65篇 |
2008年 | 94篇 |
2007年 | 95篇 |
2006年 | 107篇 |
2005年 | 82篇 |
2004年 | 78篇 |
2003年 | 69篇 |
2002年 | 75篇 |
2001年 | 78篇 |
2000年 | 86篇 |
1999年 | 73篇 |
1998年 | 107篇 |
1997年 | 110篇 |
1996年 | 119篇 |
1995年 | 81篇 |
1994年 | 83篇 |
1993年 | 86篇 |
1992年 | 92篇 |
1991年 | 74篇 |
1990年 | 93篇 |
1989年 | 99篇 |
1988年 | 95篇 |
1987年 | 86篇 |
1986年 | 90篇 |
1985年 | 69篇 |
1984年 | 82篇 |
1983年 | 47篇 |
1982年 | 47篇 |
1981年 | 48篇 |
1980年 | 58篇 |
1979年 | 33篇 |
1978年 | 33篇 |
1977年 | 45篇 |
1976年 | 43篇 |
1975年 | 42篇 |
1971年 | 36篇 |
1965年 | 53篇 |
1964年 | 52篇 |
1963年 | 47篇 |
1962年 | 41篇 |
1961年 | 41篇 |
1960年 | 65篇 |
排序方式: 共有3836条查询结果,搜索用时 57 毫秒
31.
32.
KLEPP K-I.; ULVIK R.J.; MATTHIESEN S.B.; HANNAN P.; JACOBS D.R. JR.; AARO L.E. 《European journal of public health》1993,3(1):38-42
The general public of the City of Bergen, Norway was Invitedto participate in a cholesterol screening programme in October1988. Participants received the results of the cholesterol screeningand nutritional information from trained health personnel. Ashort questionnaire was mailed to all 354 participants 12weeks after the initial cholesterol screening. In March 1990,all participants were invited to have their cholesterol levelsre-examined. Psychosocial factors believed to be predictiveof future serum cholesterol changes were assessed at baselinealong with demographic variables. The majority of participants(61%) reduced their cholesterol level from October 1988 to March1990, and the average reduction in cholesterol level for thetotal population was 4.0%. Baseline cholesterol levels, beingconfident of one's own ability to change one's diet (self-efficacy),seeing heart disease risk reduction as very important, and maritalstatus were factors that significantly predicted successfulcholesterol reduction 18 months later. 相似文献
33.
Postoperative radiation therapy in the management of lung cancer 总被引:1,自引:0,他引:1
Postoperative radiation therapy for lung cancer is still controversial. In a 9-year period, 69 patients with non-oat-cell carcinoma of the lung (16% stage I, 26% stage II, and 58% stage III) received such therapy. The radiation dose was less than 5,000 cGy in 42 patients, 5,000-5,900 cGy in 16, and 6,000 cGy or more in 11; follow-up ranged from 24 to 64 months. Actuarial survival at 2 and 4 years was 50% and 16%, respectively, for squamous cell carcinoma, and 40% and 26% for adenocarcinoma. The 5-year survival for stages I, II, and III cancer was 29%, 17%, and 19%, respectively. Histologic findings and type of surgery did not affect survival, but the radiation dose apparently did. The 3-year survival for patients who received less than 6,000 cGy was 35%, compared with 73% for patients who received higher doses. In eight patients, treatment failed within the irradiated volume: all had received doses of less than 6,000 cGy, and the volume in three was judged to be inadequate. 相似文献
34.
35.
Evaluation of maternal plasma creatine kinase activity as a marker of abnormal early pregnancy 总被引:1,自引:0,他引:1
Zorn JR; Cherruau B; Abi-Rached F; Dehee A; Danoy X; Le Blond J; Ekindjian O 《Human reproduction (Oxford, England)》1997,12(11):2534-2537
We have tested the value of maternal plasma creatine kinase activity for
diagnosing ectopic pregnancies obtained after in-vitro fertilization and
embryo transfer. Plasma creatine kinase was assayed in 57 patients: 20
normal, 23 miscarriages and 14 ectopic pregnancies, for a total of 240
samples. All values were in the lower part of the normal range except only
one in a miscarrying patient. A statistically significant difference was
observed for a cut-off value of 45 IU/l between normal and ectopic
pregnancies. However, for this cut-off point, the measurement of plasma
creatine kinase activity had a sensitivity of 0.50 and a specificity of
0.76 for the diagnosis of ectopic pregnancy. The positive predictive value
was 0.69. Creatine kinase activity measurements are thus of no practical
value in this particular population, in which an early and specific marker
of ectopic implantation would be of paramount interest. The association of
human chorionic gonadotrophin (HCG) determinations and ultrasound scanning
of the pelvis still remain the best paraclinical support for an early
diagnosis of ectopic implantation.
相似文献
36.
Management of variceal bleeding in patients with extrahepatic portal vein thrombosis 总被引:1,自引:0,他引:1
Patients with extrahepatic portal vein thrombosis may present from infancy through adulthood with variceal bleeding. Physiologically, such patients differ from patients with cirrhosis and variceal bleeding in that they have a normal liver and maintain good portal perfusion through hepatopedal collaterals. Complete evaluation of these patients requires identification of the bleeding site by endoscopy, definition of the anatomy by angiography, and confirmation of a normal liver by biopsy examination. Causative factors, including hypercoagulable states, should be evaluated. Therapeutic options range from noninterventive, through ablative procedures, to shunt operations. The goal should be definitive control of bleeding and return to a normal lifestyle. Distal splenorenal shunt offers the best option if technically feasible, but if no shuntable veins are patent, ablative procedures and sclerotherapy may be required. A noninterventive, noninvestigational approach is inappropriate in patients who can be offered definitive therapy. Splenectomy for hypersplenism should not be done in these patients. 相似文献
37.
38.
39.
MARTIN J. BOHN JR JOYCE L. CARBONELL EDWIN I. MEGARGEE 《Criminal behaviour and mental health : CBMH》1995,5(1):14-33
This study investigated the applicability and utility of Megargee and Bohn's MMPI-based offender classification system in correctional mental health units (MHUs). Previous studies found that 11 MHU samples (n = 1723) had substantially more offenders classified in the more pathological MMPI types than did 21 samples (n = 5881) drawn from general male populations in US prisons. In this study of 63 severely disturbed felons, 43% belonged to the most pathological type (‘group How’). Comparing MHU patients with general offenders from the same IvfIvIPI types on staff ratings and case history variables, we found that the MHU patients were significantly poorer in adjustment. Within the MHU sample, there was no difference in case history variables or adjustment ratings between those in the most and least severe MMPI types. These findings differed from those of studies using less severely disturbed, more heterogeneous, MHU populations. It was concluded that, in settings in which the entire population is flagrantly disturbed, the MMPI-based system is more useful in screening potential admissions than it is in making meaningful distinctions among those already admitted. 相似文献
40.
T. W. Bax D. R. Marcus G. Q. Galloway L. L. Swanstrom B. C. Sheppard 《Surgical endoscopy》1996,10(12):1150-1153
Background: Laparoscopic adrenalectomy has recently been shown to be a safe and effective means of treating adrenal pathology with much
lower morbidity than the traditional approach. The majority of reports in the literature involve removal of adrenal tumors.
Although open bilateral adrenalectomy has been utilized for persistent Cushing's syndrome following attempted hypophysectomy,
there is little data available describing the application of laparoscopic adrenal surgery to this problem.
Methods: Four patients with persistent Cushing's syndrome after attempted treatment with hypophysectomy underwent laparoscopic bilateral
adrenalectomy at our institution. One procedure was done transabdominally in the supine position. Three procedures were done
transabdominally using sequential lateral decubitus positions.
Results: All procedures were completed laparoscopically. The mean operative time was 4.6 h (range 3.9–5.25). Repositioning and reprepping
the patients resulted in a slight increase in operative time, but visualization was improved using the lateral decubitus position.
Average blood loss: 156 cc (range 50–300). One patient required early reoperation for bleeding from the left adrenal bed,
which was controlled laparoscopically. Three patients were eating the following day and were discharged on postoperative days
1, 2, and 5. The fourth patient remained hospitalized for 18 days due to problems unrelated to surgery. After a mean follow-up
of 10 months, all patients have done well and have no clinical or biochemical evidence of recurrent disease.
Conclusion: Our clinical experience indicates that laparoscopic bilateral adrenalectomy is a viable treatment option for Cushing's syndrome
following failed hypophysectomy.
Received: 29 March 1996/Accepted: 12 June 1996 相似文献