全文获取类型
收费全文 | 2561676篇 |
免费 | 191951篇 |
国内免费 | 5607篇 |
专业分类
耳鼻咽喉 | 36547篇 |
儿科学 | 81846篇 |
妇产科学 | 73726篇 |
基础医学 | 361251篇 |
口腔科学 | 74409篇 |
临床医学 | 223951篇 |
内科学 | 503463篇 |
皮肤病学 | 59898篇 |
神经病学 | 210529篇 |
特种医学 | 99944篇 |
外国民族医学 | 879篇 |
外科学 | 389411篇 |
综合类 | 58062篇 |
现状与发展 | 8篇 |
一般理论 | 897篇 |
预防医学 | 189989篇 |
眼科学 | 59898篇 |
药学 | 186664篇 |
5篇 | |
中国医学 | 5587篇 |
肿瘤学 | 142270篇 |
出版年
2018年 | 27470篇 |
2017年 | 21467篇 |
2016年 | 24337篇 |
2015年 | 26724篇 |
2014年 | 37179篇 |
2013年 | 56721篇 |
2012年 | 75483篇 |
2011年 | 80309篇 |
2010年 | 47291篇 |
2009年 | 44517篇 |
2008年 | 75879篇 |
2007年 | 81292篇 |
2006年 | 81937篇 |
2005年 | 79646篇 |
2004年 | 76435篇 |
2003年 | 73622篇 |
2002年 | 71986篇 |
2001年 | 121636篇 |
2000年 | 125402篇 |
1999年 | 104504篇 |
1998年 | 29262篇 |
1997年 | 26500篇 |
1996年 | 25890篇 |
1995年 | 24516篇 |
1994年 | 22617篇 |
1993年 | 21096篇 |
1992年 | 79071篇 |
1991年 | 75947篇 |
1990年 | 73755篇 |
1989年 | 71192篇 |
1988年 | 65924篇 |
1987年 | 64530篇 |
1986年 | 61362篇 |
1985年 | 58394篇 |
1984年 | 44343篇 |
1983年 | 37516篇 |
1982年 | 22918篇 |
1981年 | 20638篇 |
1979年 | 40793篇 |
1978年 | 29047篇 |
1977年 | 24841篇 |
1976年 | 22798篇 |
1975年 | 24883篇 |
1974年 | 29532篇 |
1973年 | 28703篇 |
1972年 | 27185篇 |
1971年 | 25071篇 |
1970年 | 23907篇 |
1969年 | 22663篇 |
1968年 | 21405篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
A HIGH FREQUENCY OF INHERITED DEFICIENCY OF COMPLEMENT COMPONENT C4 IN DARWIN ABORIGINES 总被引:2,自引:0,他引:2
Abstract A high frequency of serum complement component C4A deficiency may explain the higher prevalence and greater severity of systemic lupus erythematosus reported in Australian Aborigines. Inherited deficiencies of serum complement components C4A, C4B, and C2 were examined in two Australian Aboriginal populations from Darwin and Alice Springs and compared with the prevalence of complement deficiencies in white Australian blood donors. The frequency of C4A deficiency alleles was 29% in Darwin Aborigines compared with 12% in Alice Springs and 17% in Canberra blood donors. Partial C4B deficiency was also higher in Darwin Aborigines than in the other populations. Inherited deficiency of serum complement component C2 was not observed. 相似文献
993.
Authors with wide experience report that the Shouldice technique for repair of inguinal hernia is very effective. The technique has not gained widespread acceptance or notoriety. For example, the 13th edition of Textbook of Surgery, edited by Sabiston, devotes only one paragraph to this type of herniorrhaphy. Because of the excellent results reported by the Shouldice Clinic, this technique was adopted at the Augusta Veterans Administration Hospital, a teaching hospital of the Medical College of Georgia. Since 1976, a total of 604 Shouldice repairs have been performed by supervised house staff; 468 patients have been followed for up to 8 years and a recurrence rate of 1.3 per cent is reported. Although the follow-up is brief, the Shouldice hernia repair is widely applicable and good results are not dependent on wide experience alone. 相似文献
994.
995.
996.
997.
Summary A new modification of microvenous anastomosis, which has increased patency rates while simultaneously decreasing the difficulty of the procedure, is presented in this paper. The primary purpose of this study was to compare the classical and the temporary stent techniques of microvenous anastomosis. Because of problems such as mixing and tangling of strings during insertion and tying of the last four sutures while applying the temporary stent technique, we decided to modify the procedure. The silastic tube was removed through an incision (venotomy), distant from the actual suture line. This modified technique and the other above mentioned techniques were carried out on rat femoral veins. The results indicate that this modification has increased patency rates, shortened the time of anastomosis and facilitated the procedure. 相似文献
998.
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
999.
F Elferink W J van der Vijgh W W ten Bokkel Huinink J B Vermorken I Klein B Winograd M K Knobf G Simonetti H E Gall J G McVie 《British journal of cancer》1987,56(4):479-483
Pharmacokinetics of the cis-platin analog ethylenediaminemalonatoplatinum(II) (JM-410) was studied in 28 cycles of 19 patients during the phase I study of this drug. The drug was administered intravenously by short-term (10-60 min) infusion. Doses ranged from 20 to 1,200mg m-2. JM-40 was determined in plasma ultrafiltrate and urine by HPLC. Platinum (Pt) concentrations were determined in plasma, plasma ultrafiltrate, urine and red blood cells by atomic absorption spectrometry up to 5 days after administration of the drug. Ultrafilterable Pt could be determined up to 45 days after the infusion in one patient sampled over such a long period. Pharmacokinetics of JM-40 showed a linear behaviour. The final half-life of total Pt in plasma was 4.1 +/- 0.9 days. The disposition of JM-40 was similar to that of ultrafilterable Pt in respect to t1/2 alpha (10 and 13 min), t1/2 beta (44 and 57 min), volumes of distribution Vc (11 and 121) and Vss (17 and 201), systemic clearance (256 and 223 ml min-1), renal clearance (69 and 73 ml min-1) and metabolic clearance (183 and 154 ml min-1). During the first 6 h 27 +/- 9% of the administered dose was excreted as JM-40. Cumulative platinum excretion in the urine amounted to 29 +/- 13% and 60 +/- 13% over the first 6 h, 24 h and 5 days, respectively. The uptake of platinum in red blood cells was limited, comprising only 0.24 +/- 0.12% of the administered dose. Although JM-40 and carboplatin are structurally closely related, pharmocokinetics and toxicity of JM-40 were more similar to cis-platin than to carboplatin. 相似文献
1000.
Inborn errors of the urea cycle are an important cause of hyperammonaemia throughout childhood, and are associated with high morbidity and mortality rates. If they are diagnosed early and treated appropriately, the outcome for affected children is significantly improved. 相似文献