全文获取类型
收费全文 | 60354篇 |
免费 | 4878篇 |
国内免费 | 404篇 |
专业分类
耳鼻咽喉 | 896篇 |
儿科学 | 1322篇 |
妇产科学 | 1365篇 |
基础医学 | 9217篇 |
口腔科学 | 872篇 |
临床医学 | 6482篇 |
内科学 | 11967篇 |
皮肤病学 | 1743篇 |
神经病学 | 5283篇 |
特种医学 | 3018篇 |
外国民族医学 | 1篇 |
外科学 | 6728篇 |
综合类 | 625篇 |
现状与发展 | 1篇 |
一般理论 | 35篇 |
预防医学 | 4868篇 |
眼科学 | 1442篇 |
药学 | 4780篇 |
中国医学 | 427篇 |
肿瘤学 | 4564篇 |
出版年
2023年 | 294篇 |
2022年 | 634篇 |
2021年 | 1549篇 |
2020年 | 895篇 |
2019年 | 1387篇 |
2018年 | 1573篇 |
2017年 | 1211篇 |
2016年 | 1712篇 |
2015年 | 2148篇 |
2014年 | 2624篇 |
2013年 | 3183篇 |
2012年 | 4584篇 |
2011年 | 4424篇 |
2010年 | 2662篇 |
2009年 | 2289篇 |
2008年 | 3342篇 |
2007年 | 3378篇 |
2006年 | 3084篇 |
2005年 | 2964篇 |
2004年 | 2577篇 |
2003年 | 2378篇 |
2002年 | 2159篇 |
2001年 | 1035篇 |
2000年 | 985篇 |
1999年 | 896篇 |
1998年 | 492篇 |
1997年 | 434篇 |
1996年 | 397篇 |
1995年 | 346篇 |
1994年 | 301篇 |
1993年 | 315篇 |
1992年 | 633篇 |
1991年 | 649篇 |
1990年 | 562篇 |
1989年 | 637篇 |
1988年 | 608篇 |
1987年 | 602篇 |
1986年 | 513篇 |
1985年 | 521篇 |
1984年 | 424篇 |
1983年 | 359篇 |
1982年 | 298篇 |
1981年 | 255篇 |
1980年 | 233篇 |
1979年 | 311篇 |
1978年 | 277篇 |
1977年 | 196篇 |
1974年 | 220篇 |
1973年 | 228篇 |
1972年 | 182篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
52.
53.
54.
55.
56.
57.
S. A. R. Nouraei C. B. Singh M. S. Ferguson K. Young D. Roy J. M. Philpott 《European journal of plastic surgery》2007,30(4):153-157
The objective of this study is to assess the results of repairing septal perforations with a vascularized pedicled alar cartilage
island flap. Using the external rhinoplasty approach, a vascularized flap of alar cartilage, harvested as a cephalic trim
and pedicled on the ascending columellar branches of the superior labial artery was raised. Bilateral mucoperichondrial septal
flaps were elevated and the alar flap was transposed and secured within the defect and bilaterally overlaid with temporalis
fascia. Silastic sheets were placed and remained in situ until the grafts were revascularized from the peripheries of the
defect as well as centrally from the alar flap. The revascularized temporalis fascia acted as a scaffold for nasal remucosalization.
The alar flap also increased the long-term structural robustness of the repair. Between 1999 and 2003, 14 patients with septal
perforations ranging from 10 to 31 mm underwent septal reconstruction using this technique. There were nine males and five
females. The flap was successfully raised in all cases and long-term closure was maintained in 12 patients (86%). The alar
cartilage flap is an effective technique for repairing septal perforations in selected patients. It provides vascularized
tissue which nourishes the grafts during remucosalization, and a cartilaginous framework, which affords long-term structural
support to the repair. It also obviates the need to transpose nasal mucosa and create a secondary defect. The rhinoplasty
approach furthermore permits additional nasal deformities to be corrected at the same time.
Presented at the British Association of Plastic Surgeons Summer Scientific Meeting, Sheffield, UK (12 July 2006). 相似文献
58.
59.
The purpose of this article is to present the types of marketing tools used in child care and the extent to which they are used. A study of related literature in service marketing reveals that many of the principles of marketing apply in child care. The results of a survey sent to child care centers in Atlanta, Buffalo, Kansas City, San Antonio, and Seattle are presented. The sample included 167 responses. The results are analyzed by geographic location and type of center. Methods of packaging and promoting child care centers are presented. 相似文献
60.
Elemental composition and water content of myelinated axons and glial cells in rat central nervous system 总被引:1,自引:0,他引:1
The distribution of elements (e.g. Na, Cl, K) and water in CNS cells is unknown. Therefore, electron probe X-ray microanalysis (EPMA) was used to measure water content and concentrations (mmol/kg dry or wet weight) of Na, Mg, P, S, Cl, K and Ca in morphological compartments of myelinated axons and glial cells from rat optic nerve and cervical spinal cord white matter. Axons in both CNS regions exhibited similar water content ( 90%), and relatively high concentrations (wet and dry weight) of K with low Na and Ca levels. The K content of axons was related to diameter, i.e. small axons in spinal cord and optic nerve had significantly less (25–50%) K than larger diameter axons from the same CNS region. The elemental composition of spinal cord mitochondria was similar to corresponding axoplasm, whereas the water content (75%) of these organelles was substantially lower than that of axoplasm. In glial cell cytoplasm of both CNS areas, P and K (wet and dry weight) were the most abundant elements and water content was approximately 75%. CNS myelin had predominantly high P levels and the lowest water content (33–55%) of any compartment measured. The results of this study demonstrate that each morphological compartment of CNS axons and glia exhibits a characteristic elemental composition and water content which might be related to the structure and function of that neuronal region. 相似文献