全文获取类型
收费全文 | 7766篇 |
免费 | 793篇 |
国内免费 | 64篇 |
专业分类
耳鼻咽喉 | 49篇 |
儿科学 | 266篇 |
妇产科学 | 214篇 |
基础医学 | 1255篇 |
口腔科学 | 333篇 |
临床医学 | 738篇 |
内科学 | 1517篇 |
皮肤病学 | 118篇 |
神经病学 | 751篇 |
特种医学 | 462篇 |
外科学 | 974篇 |
综合类 | 170篇 |
一般理论 | 5篇 |
预防医学 | 732篇 |
眼科学 | 75篇 |
药学 | 541篇 |
中国医学 | 2篇 |
肿瘤学 | 421篇 |
出版年
2021年 | 94篇 |
2020年 | 70篇 |
2019年 | 72篇 |
2018年 | 114篇 |
2017年 | 74篇 |
2016年 | 84篇 |
2015年 | 100篇 |
2014年 | 166篇 |
2013年 | 228篇 |
2012年 | 349篇 |
2011年 | 363篇 |
2010年 | 206篇 |
2009年 | 220篇 |
2008年 | 302篇 |
2007年 | 356篇 |
2006年 | 276篇 |
2005年 | 286篇 |
2004年 | 273篇 |
2003年 | 240篇 |
2002年 | 259篇 |
2001年 | 257篇 |
2000年 | 244篇 |
1999年 | 201篇 |
1998年 | 140篇 |
1997年 | 141篇 |
1996年 | 155篇 |
1995年 | 130篇 |
1994年 | 127篇 |
1993年 | 126篇 |
1992年 | 183篇 |
1991年 | 207篇 |
1990年 | 153篇 |
1989年 | 185篇 |
1988年 | 185篇 |
1987年 | 179篇 |
1986年 | 189篇 |
1985年 | 181篇 |
1984年 | 130篇 |
1983年 | 100篇 |
1982年 | 83篇 |
1981年 | 75篇 |
1980年 | 67篇 |
1979年 | 118篇 |
1978年 | 88篇 |
1977年 | 63篇 |
1976年 | 58篇 |
1975年 | 72篇 |
1974年 | 80篇 |
1973年 | 66篇 |
1972年 | 58篇 |
排序方式: 共有8623条查询结果,搜索用时 31 毫秒
31.
32.
33.
Pernes JM; Vitoux JF; Brenoit P; Raynaud A; Parola JL; Roth JP; Angel CY; Fiessinger JN; Roncato M; Gaux JC 《Radiology》1986,158(2):481-485
Thirty-five patients hospitalized for recent angiographically documented arterial occlusion in the legs (27 femoropopliteal arteries and eight grafts) benefited from local fibrinolytic therapy delivered at the site of the occlusion with a 4- or 5-F catheter. This therapy combined a continuous urokinase (UK) infusion of 1,000 U/kg/hour and a lysyl plasminogen (LYS-PLG) infusion of 15 microkatals every 30 minutes. Angiographically confirmed lysis was obtained in 85% of the cases. Only 3% of the patients had major and 6% had minor groin hematomas. Only two patients had concentrations of fibrinogen as low as 100 mg/dl. Intravascular infusion of UK-LYS-PLG is as effective as streptokinase. Its excellent tolerance makes it a good alternative in the treatment of acute ischemia in the lower limbs. 相似文献
34.
35.
All physicians who had billed Pennsylvania Blue Shield for at least three intravenous contrast studies during 1989 were surveyed on their use of nonionic versus ionic contrast. This surveyed group represents a diversity of hospital sizes, practice types, and group sizes. Of the 383 physician groups surveyed, responses were obtained from 285. The majority of the responding groups were radiologists (94.0%). Nonionic contrast is utilized in 41.3% of all intravenous studies. Radiologists use nonionic contrast in a much greater proportion than nonradiologists (P < 0.0001), with 17.6% of radiologists utilizing nonionic contrast in all of their patients. Conversely, 75% of nonradiologists utilize ionic contrast in all of their patients. For all physician groups surveyed, 40.3% utilize nonionic for at least 50%, while 27.6% use nonionics for more than 75% of their patients. The routine use of steroid premedication prior to the injection of ionic contrast is not a common practice. The increased utilization of nonionic contrast found in this survey may reflect the cross-section of physicians and practice types surveyed or may represent changing practice patterns among physicians utilizing contrast material. 相似文献
36.
Brandon JC; Teplick SK; Haskin PH; Sammon JK; Muhr WF; Hofmann AF; Gambescia RA; Zitomer N 《Radiology》1988,166(3):665-667
The authors describe their experience with methyl tertiary butyl ether (MTBE) in a larger series of patients than previously reported in order to acquaint physicians with both its effectiveness for dissolution of common bile duct calculi and the limitations of its use. Ten patients with 13 biliary calculi underwent percutaneous stone dissolution treatment with the experimental cholesterol solvent, MTBE. Three stones completely dissolved within 30 minutes, seven were reduced in size, and three were visibly unaffected. All stones not completely dissolved were easily extracted by means of a stone basket except for one in a patient taken to surgery. Although MTBE perfusion is an effective technique for management of biliary calculi, practitioners should be aware that its use is quite time consuming and its odor difficult to control. 相似文献
37.
An experimental model of colonic urinary diversion was performed on male Wistar rats to see if faeces, urine or a faeces and urine mixture produces tumours. Cell kinetic techniques, including the crypt cell production rate, and cellular DNA measurement were used to examine the effect of urine and of faeces on the colonic mucosa. Urinary diversion into the colon significantly increased colonic crypt activity. Tumours were found at the anastomosis when urine and faeces were mixed at 4 months, and at 6 months with urine alone. 相似文献
38.
Ultrasound (US) can be used to visualize vertebral segments, suggesting a quantitative means of studying vertebral column growth in utero and thus a means of detecting developmental abnormalities. US images of the lumbar spine were obtained in 128 clinically normal fetuses between the gestational age of 11 through 41 weeks. A large-aperture, dynamically focused US system capable of regional magnification was used. Average lumbar spacing was calculated from distance between centrums of at least four lumbar bodies. The average distance between lumbar centrums increased nearly linearly throughout the second and third trimesters (r2 = 0.98). Enhanced anatomic display implies new capabilities for recognizing developmental abnormalities antenatally. 相似文献
39.
During a 12-month period ending on November 30, 1988, data on 133 pediatric patients visiting a pediatric emergency department with water-related injuries were collected. Of these patients, 70% were male. There were 13 submersions, seven cases of head trauma, three cases of neck trauma, 88 cases of external injury, and 34 other injuries. Incidents took place at beaches (75%) in public pools (12%), in friends' pools (4%), and in home pools (4%). Eighty-six percent of the cohort knew how to swim. Swimming, playing, and surfing activity accounted for most of the injuries. Measures for prevention are described. 相似文献
40.