全文获取类型
收费全文 | 10655篇 |
免费 | 2888篇 |
国内免费 | 244篇 |
专业分类
耳鼻咽喉 | 660篇 |
儿科学 | 289篇 |
妇产科学 | 227篇 |
基础医学 | 202篇 |
口腔科学 | 316篇 |
临床医学 | 1700篇 |
内科学 | 2520篇 |
皮肤病学 | 524篇 |
神经病学 | 1215篇 |
特种医学 | 532篇 |
外科学 | 3165篇 |
综合类 | 43篇 |
现状与发展 | 2篇 |
一般理论 | 1篇 |
预防医学 | 790篇 |
眼科学 | 393篇 |
药学 | 93篇 |
中国医学 | 1篇 |
肿瘤学 | 1114篇 |
出版年
2024年 | 96篇 |
2023年 | 509篇 |
2022年 | 144篇 |
2021年 | 292篇 |
2020年 | 729篇 |
2019年 | 210篇 |
2018年 | 658篇 |
2017年 | 626篇 |
2016年 | 780篇 |
2015年 | 699篇 |
2014年 | 947篇 |
2013年 | 1064篇 |
2012年 | 345篇 |
2011年 | 286篇 |
2010年 | 639篇 |
2009年 | 854篇 |
2008年 | 324篇 |
2007年 | 207篇 |
2006年 | 310篇 |
2005年 | 177篇 |
2004年 | 126篇 |
2003年 | 110篇 |
2002年 | 100篇 |
2001年 | 179篇 |
2000年 | 113篇 |
1999年 | 171篇 |
1998年 | 253篇 |
1997年 | 273篇 |
1996年 | 318篇 |
1995年 | 289篇 |
1994年 | 181篇 |
1993年 | 130篇 |
1992年 | 138篇 |
1991年 | 142篇 |
1990年 | 79篇 |
1989年 | 131篇 |
1988年 | 104篇 |
1987年 | 79篇 |
1986年 | 91篇 |
1985年 | 93篇 |
1984年 | 86篇 |
1983年 | 73篇 |
1982年 | 74篇 |
1981年 | 51篇 |
1980年 | 53篇 |
1979年 | 37篇 |
1978年 | 51篇 |
1977年 | 47篇 |
1976年 | 36篇 |
1975年 | 47篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Dawn Hastreiter MD PhD ; Jeannie Chao BS ; QI Wang MD ; Richard M. Ozuna MD ; Myron Spector PhD 《Wound repair and regeneration》2004,12(4):430-438
That a contractile actin isoform has been found in cells of other cartilage tissues in healing and disease states prompted this investigation of the presence of alpha-smooth muscle actin (alpha-SMA) in pathological human intervertebral disc tissue. The presence of this isoform has been reported in human intervertebral disc specimens obtained at autopsy from subjects for whom there were no reported symptoms. An objective of this study was to evaluate the cell density and percentage of alpha-SMA-containing cells in pathological nucleus pulposus tissue obtained from lumbar disc surgery from 17 patients. Additionally, explants of nucleus pulposus material were cultured to determine how alpha-SMA expression changed with time in vitro. Seventy-six 5-mm diameter explants (approximately 2 mm thick) pooled from six lumbar surgeries were cultured for 1, 2, 4, or 6 weeks. Microtomed sections of paraffin-embedded specimens were stained with hematoxylin and eosin or a monoclonal antibody to alpha-SMA. Histologically, cells were categorized as to alpha-SMA phenotype (positive or negative), and the areal cell density was determined. The evaluation of the cultured nucleus pulposus explants also included documentation of the percentage of cells that were round or elongated and the percentage of the cells that were part of a group (group: >/= 2 cells). Every nucleus pulposus section exhibited the presence of alpha-SMA-containing cells, which accounted for approximately 24 percent of the cells in vivo. In vivo, the cell density was significantly higher in older individuals (p = 0.02). The average time for cell outgrowth from the explants was 8.6 days. Approximately 10-15 percent of the cells in the explants stained positive for alpha-SMA. The time in culture had no significant effect on any of the outcome measures except the percentage of alpha-SMA-containing cells that were round (p = 0.008), with values decreasing through 4 weeks and then slightly rising at 6 weeks. The role of alpha-SMA in intervertebral disc pathology warrants further investigation. 相似文献
52.
Hongrun Yu PhD ; David J. Baylink MD ; Godfred L. Masinde PhD ; Runzhi Li PhD ; Bay Nguyen PhD ; Heather M. Davidson BS ; Shizhong Xu PhD ; Subburaman Mohan PhD 《Wound repair and regeneration》2007,15(6):922-927
Development of gene therapies for wound healing will depend on the identification of the genes involved in wound healing and tissue regeneration. Previous quantitative trait loci (QTL) studies in mice using the ear punch model have shown that major QTL exist on chromosome (Chr) 9 for soft tissue regeneration. In this study, we have developed a congenic line that contains the Chr 9 QTL chromosomal region from super healer MRL/MpJ in the genomic background of poor-healing SJL/J. The phenotypic effect of this QTL was confirmed in male mice, where the congenic line has shown significant healing improvement over SJL. Fine mapping of the Chr 9 QTL region with 23 markers at an average distance of 4.2 Mb using a total of 1,564 MRL/MpJ x SJL/J F(2) mice revealed the presence of at least three QTL peaks, implying that three separate loci may contribute to the phenotypic effect of this QTL. Based on the 2-LOD intervals, the total QTL region was confined to a combined length of no more than 28.2 Mb. Application of a Bayesian shrinkage estimation indicated that a major locus was located in a region of just 1.3 Mb. 相似文献
53.
The purpose of this pilot study was to observe both relaxed and deep breathing patterns in a convenience sample to determine the incidence of normal versus faulty patterns of respiration. These observations were then combined with respondent answers to a survey on pain history to determine if there is any correlation between faulty breathing and musculo-skeletal pain patterns. If such a correlation can be made, then we propose that clinicians working with chronic pain patients may have improved outcomes if they address and correct faulty breathing patterns. Based on this study, it is suggested to include the evaluation and treatment of faulty respiration in the rehabilitation of chronic musculo-skeletal conditions, most notably cervical pain. 相似文献
54.
55.
56.
57.
58.
Jocelyn M. Cottrell BS Marjolein C. H. van der Meulen PhD Joseph M. Lane MD Elizabeth R. Myers PhD 《HSS journal》2006,2(1):12-18
The clinical goal of spinal fusion is to reduce motion and the associated pain. Therefore, measuring motion under loading
is critical. The purpose of this study was to validate four-point bending as a means to mechanically evaluate simulated fusions
in dog and rabbit spines. We hypothesized that this method would be more sensitive than manual palpation and would be able
to distinguish unilateral vs bilateral fusion. Spines from four mixed breed dogs and four New Zealand white rabbits were used
to simulate posterolateral fusion with polymethyl methacrylate as the fusion mass. We performed manual palpation and nondestructive
mechanical testing in four-point bending in four planes of motion: flexion, extension, and right and left bending. This testing
protocol was used for each specimen in three fusion modes: intact, unilateral, and bilateral fusion. Under manual palpation,
all intact spines were rated as not fused, and all unilateral and bilateral simulated fusions were rated as fused. In four-point
bending, dog spines were significantly stiffer after unilateral fusion compared with intact in all directions. Additionally,
rabbit spines were stiffer in flexion and left bending after unilateral fusion. All specimens exhibited significant differences
between intact and bilateral fusion except the rabbit in extension. For unilateral vs bilateral fusion, significant differences
were present for right bending in the dog model and for flexion in the rabbit. Unilateral fusion can provide enough stability
to constitute a fused grade by manual palpation but may not provide structural stiffness comparable to bilateral fusion. 相似文献
59.
60.