全文获取类型
收费全文 | 961489篇 |
免费 | 63985篇 |
国内免费 | 1688篇 |
专业分类
耳鼻咽喉 | 13008篇 |
儿科学 | 32238篇 |
妇产科学 | 26852篇 |
基础医学 | 147822篇 |
口腔科学 | 26651篇 |
临床医学 | 84293篇 |
内科学 | 182361篇 |
皮肤病学 | 21669篇 |
神经病学 | 68111篇 |
特种医学 | 35954篇 |
外国民族医学 | 116篇 |
外科学 | 145236篇 |
综合类 | 21730篇 |
现状与发展 | 3篇 |
一般理论 | 299篇 |
预防医学 | 68858篇 |
眼科学 | 22521篇 |
药学 | 71653篇 |
3篇 | |
中国医学 | 3038篇 |
肿瘤学 | 54746篇 |
出版年
2018年 | 10847篇 |
2017年 | 8322篇 |
2016年 | 9385篇 |
2015年 | 10508篇 |
2014年 | 14166篇 |
2013年 | 21634篇 |
2012年 | 28200篇 |
2011年 | 29473篇 |
2010年 | 17952篇 |
2009年 | 16759篇 |
2008年 | 27450篇 |
2007年 | 29604篇 |
2006年 | 29860篇 |
2005年 | 28080篇 |
2004年 | 27319篇 |
2003年 | 25914篇 |
2002年 | 25049篇 |
2001年 | 47430篇 |
2000年 | 48316篇 |
1999年 | 40011篇 |
1998年 | 10462篇 |
1997年 | 9123篇 |
1996年 | 9254篇 |
1995年 | 8822篇 |
1994年 | 8158篇 |
1993年 | 7508篇 |
1992年 | 30092篇 |
1991年 | 30089篇 |
1990年 | 29309篇 |
1989年 | 28867篇 |
1988年 | 26306篇 |
1987年 | 25444篇 |
1986年 | 24177篇 |
1985年 | 22960篇 |
1984年 | 16799篇 |
1983年 | 14322篇 |
1982年 | 8100篇 |
1979年 | 15449篇 |
1978年 | 10981篇 |
1977年 | 9238篇 |
1976年 | 8796篇 |
1975年 | 9758篇 |
1974年 | 11499篇 |
1973年 | 11166篇 |
1972年 | 10467篇 |
1971年 | 9751篇 |
1970年 | 9430篇 |
1969年 | 8625篇 |
1968年 | 8088篇 |
1967年 | 7339篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
112.
113.
114.
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
115.
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
116.
117.
Recurrent erosion 总被引:1,自引:0,他引:1
118.
J. Kralovanszky N. Prajda S. Kerpel-Fronius T. Bagrij E. Kiss G. J. Peters 《Cancer chemotherapy and pharmacology》1993,32(3):243-248
Selective protection of the normal host tissues from the toxic effects of anticancer agents would allow the use of higher, probably more effective, doses of the drugs. It has been demonstrated that delayed high-dose uridine administration after 5-fluorouracil decreases the extent of myelosuppression and causes faster regeneration of the bone marrow. We studied the biochemical consequences of the gastrointestinal toxicity caused by 5-fluorouracil and the potential of high-dose uridine treatment to influence these adverse effects. 5-Fluorouracil caused dose-related decreases in the biochemical parameters (thymidine kinase, sucrase, maltase, alkaline phosphatase) selected as early markers of the impaired metabolic activity of the intestinal mucosa. The nadir of the biochemical changes was reached between 24 h and 72 h after 5-fluorouracil treatment, and complete regeneration of the mucosa took 6–7 days. Delayed high-dose uridine administration failed to mitigate the severity of the gastrointestinal damage that ensued after 5-fluorouracil treatment, but caused significantly earlier regeneration of the mucosa. 相似文献
119.
In 82 CHD male patients aged 35-54 years with well-preserved working capacity (threshold load, 600-750 kgm/min) who had underwent bicycle ergometer test, the time course of changes in the major hemodynamic parameters was found to be significantly similar to that of healthy individuals. The cases who stopped performing bicycle ergometer tests because of anginal attacks, and ST segment depression or either showed a more significant elevation in systolic and diastolic blood pressure at the maximum load rate and lower increase in heart rate than in healthy subjects, which may be regarded as a compensatory mechanism that prevents a further decrease in coronary flow. Diminished increase in stroke index and cardiac index suggests reduced myocardial contractility. 相似文献
120.
Electrocardiographic symptoms were evaluated in 53 patients with an additional left-ventricular chorda (ALVC), detected by two-dimensional echocardiography. Signs of early ventricular repolarization (EVR) were identified in 45 (84.9%) patients. A transverse ALVC was more common in EVR-free patients (87.5%), as compared to patients with ALVC + EVR combinations (51.1%; p less than 0.05). 相似文献