全文获取类型
收费全文 | 837篇 |
免费 | 162篇 |
国内免费 | 17篇 |
专业分类
耳鼻咽喉 | 12篇 |
儿科学 | 46篇 |
妇产科学 | 9篇 |
基础医学 | 32篇 |
口腔科学 | 10篇 |
临床医学 | 150篇 |
内科学 | 222篇 |
皮肤病学 | 29篇 |
神经病学 | 43篇 |
特种医学 | 76篇 |
外科学 | 172篇 |
综合类 | 48篇 |
现状与发展 | 20篇 |
预防医学 | 56篇 |
眼科学 | 25篇 |
药学 | 18篇 |
中国医学 | 2篇 |
肿瘤学 | 46篇 |
出版年
2024年 | 6篇 |
2023年 | 42篇 |
2021年 | 17篇 |
2020年 | 22篇 |
2019年 | 9篇 |
2018年 | 49篇 |
2017年 | 44篇 |
2016年 | 31篇 |
2015年 | 40篇 |
2014年 | 39篇 |
2013年 | 55篇 |
2012年 | 17篇 |
2011年 | 26篇 |
2010年 | 46篇 |
2009年 | 61篇 |
2008年 | 29篇 |
2007年 | 20篇 |
2006年 | 24篇 |
2005年 | 12篇 |
2004年 | 10篇 |
2003年 | 12篇 |
2002年 | 12篇 |
2001年 | 17篇 |
2000年 | 10篇 |
1999年 | 18篇 |
1998年 | 28篇 |
1997年 | 32篇 |
1996年 | 43篇 |
1995年 | 29篇 |
1994年 | 17篇 |
1993年 | 21篇 |
1992年 | 7篇 |
1991年 | 8篇 |
1990年 | 10篇 |
1989年 | 12篇 |
1988年 | 15篇 |
1987年 | 14篇 |
1986年 | 11篇 |
1985年 | 12篇 |
1984年 | 4篇 |
1983年 | 6篇 |
1982年 | 8篇 |
1981年 | 4篇 |
1980年 | 5篇 |
1978年 | 12篇 |
1977年 | 8篇 |
1976年 | 7篇 |
1975年 | 5篇 |
1964年 | 5篇 |
1963年 | 4篇 |
排序方式: 共有1016条查询结果,搜索用时 15 毫秒
71.
Mamas A. Mamas PhD BM BCh Farzin Fath‐Ordoubadi MD BM BChir Douglas G. Fraser MD BM BChir 《Catheterization and cardiovascular interventions》2010,76(1):102-111
Failure to deliver stents is one of the commonest causes of procedural failure in contemporary PCI practice. We describe successful use of the Guideliner Catheter, the first purpose designed FDA and CE marked device delivery catheter in 13 complex cases in native coronary vessels and bypass grafts performed via the radial route to enable distal stent delivery following failure of conventional techniques. We discuss how the Guideliner catheter may be used to facilitate difficult radial cases. © 2010 Wiley‐Liss, Inc. 相似文献
72.
Pretreatment of recipients with the monoclonal antibody (MoAb) S5 facilitates engraftment of bone marrow from mismatched, unrelated donors in the canine transplantation model. In the direct comparisons reported here, the S5 glycoprotein (gp) was found to have structural homology to CD44 that in humans has been implicated in adhesive interactions of one type of effector cell, the lymphocyte. The S5 antigen and gp90Hermes-1 exhibited codistribution on canine peripheral blood cells. Both S5 and Hermes-1 (anti-CD44) MoAbs recognized 90-Kd species in radioimmune precipitations of 125I surface-labeled canine peripheral blood lymphocytes and bone marrow cells. Competitive antibody binding experiments showed that the epitope detected by S5 was distinct from that bound by Hermes-1 but overlapped with those defined by two other known anti-CD44 reagents, IM7 and Hutch-1. Sequential immunoprecipitation with S5 and Hermes-1 indicated that the two antibodies recognize the same or overlapping subsets of membrane gps. Tryptic digestion of S5 and anti-CD44 immunoprecipitates generated two major iodinated peptides of 27 and 35 Kd in both cases, a further indication of structural homology. Similarly, after N-glycanase digestion, S5 and CD44 immunoprecipitates were resolved to a single 68- Kd species. These findings suggest that CD44-mediated adhesive events may affect the fate of transplanted hematopoietic cells. The previous implications of this gp in T-lymphocyte activation and lymphocyte adhesion to endothelium thus provide useful paradigms to analyze its function in the bone marrow transplant setting. 相似文献
73.
74.
G. Purcell-Jones BSc MRCP FFARCS F. Dormon MB BS FFARCS Registrars E. Sumner BM BCh FFARCS Consultant 《Anaesthesia》1987,42(12):1316-1320
This is a retrospective study on the use of postoperative opioids in neonates admitted to the surgical intensive care unit at Great Ormond Street over a 5-year period (1980-84). A total of 131 (14%) babies received opioids out of 933 neonates admitted to the unit. The use of opioids increased from 9.7% to 27.2% of admitted cases during the survey period. Postoperative ventilation of the lungs was necessary in 240 (25.7%) cases and 88 (36.6%) of these were given opioids. Four babies initially failed to wean from controlled ventilation as a result of opioid induced respiratory depression. A total of 51 (7.35%) spontaneously breathing neonates received opioids and seven (13.7%) of these developed apnoea or respiratory failure thought to be induced by opioids. The administration of opioids by nurses occurred most frequently in the late evening and early hours of the morning, when medical cover is at its lowest level. 相似文献
75.
Gastrointestinal teratomas are uncommon, benign neoplasms that occur primarily in children. A retrospective review of five cases (two gastric, one pancreatic, one mesenteric, and one in the lesser omentum) is presented with emphasis on the computed tomographic and ultrasonographic appearances. Principal findings are a well-defined mass with separate cystic and solid components of varying proportions, discrete areas with densities similar to that of fat, or coarse, globular calcifications within the solid component. Recognition of these findings may allow the radiologist to make a correct preoperative diagnosis of teratoma. 相似文献
76.
77.
78.
Intrauterine spermatic cord torsion in the newborn: sonographic and pathologic correlation 总被引:2,自引:0,他引:2
In five newborn patients with spermatic cord torsion, sonography demonstrated an enlarged and globular testis, hydrocele, and skin thickening. In four of these patients the testicular parenchyma was heterogeneous. Peripheral hypoechoic areas were seen in two of the four patients; the other two had a central hypoechoic region and a peripheral echogenic rim. The testis in the fifth patient was diffusely hyperechoic. Duplex Doppler sonography performed in two patients failed to demonstrate any signal in the spermatic cord in either the abnormal or contralateral hemiscrotum. Scintigraphic findings were positive for testicular torsion in two patients and equivocal in three patients. Surgery was performed 2-12 days after sonography and established the diagnosis of spermatic cord torsion. Pathologic examination demonstrated hemorrhagic infarction of the entire testis as well as scattered calcifications. The authors conclude that a solid globular testicular mass seen during the neonatal period is suggestive of intrauterine spermatic cord torsion. 相似文献
79.
80.
This review of recent literature explores the similarities and differences between the work of community psychiatric nurses and their mental handicap counterparts. The comparisons which have been made between groups of nurses are related to the authors own research studies. These included an observations study of one community mental handicap nursing team and a national survey of all such teams in England and Wales. The importance of trade union membership, the place of the Community Psychiatric Nursing Association and the implication of joint training courses are discussed. The emergence of a new professional role that of the 'community mental health nurse' is discussed and the implications which this might have for the future organization of community psychiatric nursing services is outlined. 相似文献