全文获取类型
收费全文 | 1127055篇 |
免费 | 85319篇 |
国内免费 | 2234篇 |
专业分类
耳鼻咽喉 | 16609篇 |
儿科学 | 34061篇 |
妇产科学 | 34378篇 |
基础医学 | 164396篇 |
口腔科学 | 32363篇 |
临床医学 | 96975篇 |
内科学 | 214034篇 |
皮肤病学 | 22835篇 |
神经病学 | 88550篇 |
特种医学 | 45370篇 |
外国民族医学 | 213篇 |
外科学 | 177662篇 |
综合类 | 31243篇 |
现状与发展 | 3篇 |
一般理论 | 416篇 |
预防医学 | 84792篇 |
眼科学 | 26800篇 |
药学 | 83555篇 |
中国医学 | 2323篇 |
肿瘤学 | 58030篇 |
出版年
2018年 | 10622篇 |
2015年 | 10848篇 |
2014年 | 15211篇 |
2013年 | 23336篇 |
2012年 | 30890篇 |
2011年 | 32402篇 |
2010年 | 19449篇 |
2009年 | 18074篇 |
2008年 | 30391篇 |
2007年 | 33232篇 |
2006年 | 32859篇 |
2005年 | 32222篇 |
2004年 | 31498篇 |
2003年 | 30206篇 |
2002年 | 28981篇 |
2001年 | 47543篇 |
2000年 | 48484篇 |
1999年 | 41025篇 |
1998年 | 11953篇 |
1997年 | 11053篇 |
1996年 | 10796篇 |
1995年 | 10229篇 |
1994年 | 9753篇 |
1992年 | 33947篇 |
1991年 | 33633篇 |
1990年 | 32968篇 |
1989年 | 31897篇 |
1988年 | 29764篇 |
1987年 | 29126篇 |
1986年 | 27729篇 |
1985年 | 26907篇 |
1984年 | 20613篇 |
1983年 | 17661篇 |
1982年 | 11035篇 |
1981年 | 10033篇 |
1980年 | 9427篇 |
1979年 | 20613篇 |
1978年 | 14959篇 |
1977年 | 12606篇 |
1976年 | 11549篇 |
1975年 | 12706篇 |
1974年 | 15638篇 |
1973年 | 15141篇 |
1972年 | 14332篇 |
1971年 | 13343篇 |
1970年 | 12755篇 |
1969年 | 12196篇 |
1968年 | 11163篇 |
1967年 | 10337篇 |
1966年 | 9639篇 |
排序方式: 共有10000条查询结果,搜索用时 10 毫秒
61.
R G Jones J W Bass M E Weisse J M Vincent 《The Pediatric infectious disease journal》1991,10(8):557-559
We tested the urine of 30 infants 6 weeks to 7 months of age after they received standard 10-micrograms (0.5-ml) doses of HbOC (HibTITER) Haemophilus influenzae b (Hib) conjugate vaccine for the presence of Hib antigenuria using a commercially available latex particle agglutination assay (Directigen). Urines were collected within 1 hour, from 1 to 3 hours, at 24 hours and at 3, 6 and 9 days after vaccine administration and reactions were quantitated from 0 to 3+. In contrast to previous studies in older children which showed little or no antigenuria following HbOC vaccination, our study shows that in infants intense Hib antigenuria is evident within 2 to 3 hours and persists 3 days after vaccine administration and that less intense antigenuria may be detected in some infants for several days. With efficacious vaccines now being used in 2- to 6-month-old infants, invasive Hib disease may soon be limited to infants of this age just before their seroconversion. It should be recognized that antigenuria occurs for several days after vaccination with Hib conjugate vaccines and that it could be erroneously interpreted as evidence of invasive Hib infection. 相似文献
62.
Most authors consider the principal advantage of FG anastomoses (compared to microsurgical anastomoses) to be shorter operating time, reduced surgical trauma to oviduct stumps, and absence of tissue ischemia. These features promote reparative regeneration and decrease adhesion formation, resulting in complete recanalization of fallopian tubes. To date, the majority of work on FG is confined to the experimental development of surgical techniques. Investigations in reconstructive gynecological surgery are quite uncommon. The physical properties of FG and the positive results of available experimental studies suggest that further development of surgical techniques using FG in obstetrics and gynecology is worthwhile. 相似文献
63.
Sustained eosinophil cationic protein release into tears after a single high-dose conjunctival allergen challenge 总被引:1,自引:0,他引:1
P. G. MONTAN M. VAN HAGE-HAMSTEN O. ZETTERSTRÖM† 《Clinical and experimental allergy》1996,26(10):1125-1130
Background The appearance of eosinophils is a hallmark sign of the allergic late-phase response (LPR). Eosinophil cationic protein (ECP), a readily measurable product released from activated eosinophils, has so far not been evaluated in the ocular LPR. Objective Two sets of trials were performed in order to investigate changes of local and systemic eosinophil activity and their possible link with symptoms and hyper-reactivity in the allergic LPR in the eye. Methods In the first experiment, ECP was analysed in tears and serum and the clinical reaction was evaluated during a 72-h time–course after a single, high-dose allergen challenge out of season in one eye of 15 pollen-sensitized volunteers. In a second experiment, the hypothesis of an increased clinical response to an allergen challenge in an eye that had been provoked with allergen 48h previously was tested in nine sensitized individuals. Results In the first experiment, symptoms at 10 min and 2, 4, 6, 8 and 24 h significantly exceeded base line scores of the challenged eyes. Tear ECP was significantly elevated in challenged eyes compared to contralateral eyes at 6, 8 and 24 h. In addition, symptoms and ECP release correlated significantly at the 24-h evaluation. Serum ECP remained unchanged throughout the study period. In the second experiment, conjunctival hyperreactivity 48h after an allergen challenge was not confirmed. Conclusion ECP secretion occurs in the experimental ocular LPR and is in part associated with the magnitude of the clinical reaction, which suggests a truly pathogenic role of the activated eosinophil in pollen-induced allergic conjunctivitis. 相似文献
64.
65.
66.
67.
H Bussey C Quandt R Rospond W Loesch 《The Journal of the American Board of Family Practice / American Board of Family Practice》1988,1(4):282-287
One of our patients had trouble maintaining therapeutic and safe levels of theophylline, even though we were careful in planning and monitoring her drug regimen. This case report shows how we were able to use principles of pharmacokinetics to distinguish among plausible explanations for her experience. We discovered that she was not taking the drug consistently as prescribed and that supervised administration resolved apparent contradictions between doses and serum levels. We believe that physicians can use the same information and methods that we used to get better and safer results from theophylline therapy. 相似文献
68.
Recurrent erosion 总被引:1,自引:0,他引:1
69.
K A Burkman R W Gaines S R Kashani R D Smith 《Archives of physical medicine and rehabilitation》1988,69(2):132-134
Herpes zoster probably occurs more often than generally thought. Since it produces a radicular distribution of pain, it should be included in the differential diagnosis of radiculopathy. A case is presented in which evaluating the radicular low back pain before the characteristic rash appears was misleading. Careful history-taking concerning the exact nature of the pain and sensory changes is needed to differentiate between zoster and radiculopathy, if no rash is evident. 相似文献
70.
R W Hertle A B Leahey S Bloom D B Schaffer S Bartlett 《Ophthalmic plastic and reconstructive surgery》1990,6(4):278-282
Chorioretinal folds have been reported as a result of many intraocular and extraocular inflammatory processes or tumors. Visual loss is usually secondary to a combination of the underlying process and chorioretinal folds involving the macula. We report a patient who developed decreased vision, metamorphopsia, chorioretinal folds, and a lamellar macular hole secondary to global compression by a bone fragment. The chorioretinal folds regressed and his vision stabilized following surgical decompression. Chorioretinal folds and lamellar macular hold formation are previously unrecognized complications of reconstructive craniofacial surgery. 相似文献