全文获取类型
收费全文 | 7877篇 |
免费 | 533篇 |
国内免费 | 21篇 |
专业分类
耳鼻咽喉 | 104篇 |
儿科学 | 276篇 |
妇产科学 | 106篇 |
基础医学 | 1303篇 |
口腔科学 | 214篇 |
临床医学 | 663篇 |
内科学 | 1750篇 |
皮肤病学 | 228篇 |
神经病学 | 596篇 |
特种医学 | 524篇 |
外国民族医学 | 2篇 |
外科学 | 1225篇 |
综合类 | 101篇 |
一般理论 | 1篇 |
预防医学 | 502篇 |
眼科学 | 122篇 |
药学 | 362篇 |
中国医学 | 3篇 |
肿瘤学 | 349篇 |
出版年
2021年 | 115篇 |
2020年 | 68篇 |
2019年 | 90篇 |
2018年 | 130篇 |
2017年 | 87篇 |
2016年 | 156篇 |
2015年 | 158篇 |
2014年 | 188篇 |
2013年 | 268篇 |
2012年 | 335篇 |
2011年 | 380篇 |
2010年 | 206篇 |
2009年 | 224篇 |
2008年 | 326篇 |
2007年 | 375篇 |
2006年 | 344篇 |
2005年 | 293篇 |
2004年 | 285篇 |
2003年 | 322篇 |
2002年 | 273篇 |
2001年 | 242篇 |
2000年 | 271篇 |
1999年 | 217篇 |
1998年 | 115篇 |
1997年 | 109篇 |
1996年 | 95篇 |
1995年 | 87篇 |
1994年 | 71篇 |
1993年 | 71篇 |
1992年 | 121篇 |
1991年 | 123篇 |
1990年 | 112篇 |
1989年 | 126篇 |
1988年 | 135篇 |
1987年 | 147篇 |
1986年 | 131篇 |
1985年 | 127篇 |
1984年 | 93篇 |
1983年 | 80篇 |
1981年 | 59篇 |
1979年 | 79篇 |
1978年 | 68篇 |
1977年 | 50篇 |
1976年 | 55篇 |
1974年 | 61篇 |
1973年 | 74篇 |
1972年 | 53篇 |
1971年 | 52篇 |
1970年 | 49篇 |
1968年 | 51篇 |
排序方式: 共有8431条查询结果,搜索用时 15 毫秒
1.
Oil-emulsified (OE) and aqueous (Aq) vaccines were prepared with the same batch of inactivated A24 8345 foot and mouth disease virus (FMDV). Calves born to vaccinated dams did not respond to the Aq vaccine 30 or 90 days post partum. When the OE vaccine was used on a similar group of calves, no responses were elicited up to 21 days post partum. However, calves 30 or more days old responded like adult cattle to the OE vaccine. When the OE vaccine was used in colostral antibody-free calves 3-30 days old, all animals showed good antibody responses but, in calves vaccinated 3 or 7 days post partum, antibodies were detectable only after a considerable period of time. Our results show that both passively acquired colostral antibodies and age are important in the response of very young calves to FMDV oil vaccines. From a practical point of view, in endemic areas where adult cattle are periodically vaccinated, vaccination of calves between 30 and 60 days post partum with OE vaccines would lead to high levels of herd protection. 相似文献
2.
The Resource-Based Relative Value Scale. Toward the development of an alternative physician payment system 总被引:2,自引:0,他引:2
This article describes the design and methods of a study currently under way to develop a Resource-Based Relative Value Scale (RBRVS); an alternative basis for establishing the payment rate for the services and procedures (S/Ps) of physicians in medical and surgical specialties. Physician resource inputs to be measured include (1) S/P time, (2) pre-S/P and post-S/P times, (3) intensity, (4) practice costs, including malpractice premiums, and (5) the cost of specialty training. These five factors will be combined to produce an RBRVS denominated in nonmonetary units. In the initial phase of the study, data on time and intensity will be obtained through a national survey of physicians who perform these S/Ps. In the second, consensus phase of the project, the investigators will convene a panel of representatives of the medical profession, third-party payers, consumers, and other interested parties to examine areas of agreement and disagreement as to how an RBRVS should be used for policy purposes. The final results of this study are expected by the summer of 1988. 相似文献
3.
Long-term complications of renal transplantation 总被引:3,自引:0,他引:3
W E Braun 《Kidney international》1990,37(5):1363-1378
4.
BACKGROUND: Patient education is integral part of any diabetes therapy in Germany, but elderly patients are not able to follow the variety of topics comprising standard treatment and teaching programmes (TTP), primarily due to impaired neuropsychological function. This leads to deficits in diabetes knowledge and hindered ability for diabetes self-management. AIM: To evaluate structured TTP for geriatric patients with impaired cognitive function. PATIENTS AND METHODS: A neuropsychological examination was performed on all patients over 54 years [n=102, age 68.6 +/- 8.7 years, diabetes duration 10.3 (0.03-35.4) years, HbA1c 10.3 +/- 1.7% (HPLC, Diamat, NR 4.5-6.3%), cognitive function 87.7 +/- 12.3 IQ points] who took part in TTP for insulin therapy. Patients with impaired cognitive function participated either in the standard TTP of Berger [n = 35, age 67.6 +/- 8.9 years, diabetes duration 9.9 (0.04-35.4) years, HbA1c 10.3 +/- 2.0%] or in the specialized structured geriatric DICOF-TTP [n=33, age 70.4 +/- 8.2 years, diabetes duration 10.4 (0.03-24.9) years, HbA1c 10.7 +/- 1.8%]. RESULTS: After TTP there were no differences in knowledge and ability for diabetes self-management (standard/DICOF: knowledge 11.0 +/- 2.6 vs. 12.2 +/- 2.7 points, P = 0.11; handling 14.9 +/- 3.3 vs. 15.9 +/- 2.5 points, P = 0.18). However, patients who took part in the DICOF programme showed better scores in satisfaction with the education programme [standard/DICOF 44.7 (31-57) vs. 52.5 (45-59) points, P < 0.001]. Six months later the DICOF participants showed better results regarding diabetes self-management (standard/DICOF: handling 12.5 +/- 4.1 vs. 15.9 +/- 3.1 points, P = 0.001). Both groups showed HbA1c decrease (8.3 +/- 1.4 vs. 8.5 +/- 1.3%, P=0.62) and similar incidence of acute complications. CONCLUSIONS: Elderly patients with impaired cognitive function should take part in specialized structured TTP. This leads to both better satisfaction with the education programme and an improved ability for diabetes self-management. 相似文献
5.
6.
We report on a man without any symptoms until the age of 29 years when a ventricular tachyarrhythmia occurred for the first time. There were electrocardiographic signs of a previous myocardial infarction of the anterior wall, but there had not even been any episode of angina pectoris. The cause was the anomalous origin of the left coronary artery from the pulmonary trunk (Bland-White-Garland syndrome). Therapy consisted of ligation of the left coronary artery and the implantation of an aortocoronary vein graft to the left coronary artery in order to reinstall a two-coronary system. Diagnosis is easily made by coronary angiography. At a 3-year follow-up there was an increase of the ejection fraction/cardiac output, a stable sinus rhythm, and an improved physical endurance. 相似文献
7.
Results of intersphincteric resection of the rectum with direct coloanal anastomosis for rectal carcinoma. 总被引:13,自引:0,他引:13
J Braun K H Treutner G Winkeltau U Heidenreich M M Lerch V Schumpelick 《American journal of surgery》1992,163(4):407-412
Between 1977 and 1987, 519 patients underwent operation for rectal carcinoma. Sixty-three patients underwent intersphincteric resection with direct coloanal anastomosis (CAA), and 77 had an abdominoperineal resection (APR). Curative surgery was achieved in 57 and 65 patients, respectively. Both groups were comparable regarding age, stage of tumors, and localization of tumors. During the mean period of 6.7 years (range: 3 to 13.6 years), all patients were examined according to a predefined follow-up plan. From those patients with curative surgery, 11% presented with pelvic recurrence and 33% with distant metastases after coloanal anastomosis; the rates of recurrence and distant metastases after APR were 17% and 35%, respectively. The corrected 5-year survival rates were 62% following CAA and 53% following APR. Eighty-five percent of the patients with CAA reported good functional results regarding anal continence. Our study demonstrates that the intersphincteric resection with CAA is a valuable surgical technique for rectal carcinoma with the benefit of preservation of continence. It is suitable for neoplasms with high- and medium-grade differentiation (G1 to G2) and a localization that allows a minimum distal clearence of 3 cm. 相似文献
8.
Postoperative pulmonary complication rate and long-term changes in respiratory function following esophagectomy with esophagogastrostomy 总被引:9,自引:0,他引:9
Upper abdominal surgery has a high incidence of postoperative respiratory complications. Although operations involving a thoracic as well as an upper abdominal incision as encountered in esophageal surgery are likely to be associated with an even higher complication rate and perhaps permanent alterations of respiratory function, only a few studies have addressed this problem. We evaluated the postoperative course of patients undergoing thoracoabdominal esophagectomy with esophagogastrostomy. Twenty patients were evaluated, of whom 10 (50%) developed respiratory complications as defined by our criteria, which were the simultaneous occurrence of rectal temperature over 38 degrees C on the first postoperative day and radiographic evidence of pulmonary infiltration. Although there is no general consensus regarding the diagnostic criteria of a postoperative pulmonary complication, we were able to validate the clinical relevance of our definition by showing that these patients suffered from a more severe and more prolonged impairment of global oxygen exchange than those who did not fulfill the criteria. They also required a longer period of respiratory support (median duration of intubation 12 vs. 3 days, P less than 0.005). A comparison of the preoperative pulmonary function with that determined at least 6 months after the operation showed that only vital capacity (VC) and total lung capacity (TLC) were significantly (P less than 0.05) reduced following the operation, but not to a clinically relevant degree (VC-6%, TLC-7%). 相似文献
9.
Dr. iur. Susanne Braun 《MedR Medizinrecht》2007,25(4):218-223
Ohne Zusammenfassung 相似文献
10.