全文获取类型
收费全文 | 195880篇 |
免费 | 2654篇 |
国内免费 | 99篇 |
专业分类
耳鼻咽喉 | 1302篇 |
儿科学 | 7317篇 |
妇产科学 | 3624篇 |
基础医学 | 19554篇 |
口腔科学 | 1899篇 |
临床医学 | 14710篇 |
内科学 | 34855篇 |
皮肤病学 | 1325篇 |
神经病学 | 18321篇 |
特种医学 | 9450篇 |
外国民族医学 | 4篇 |
外科学 | 30892篇 |
综合类 | 2560篇 |
一般理论 | 20篇 |
预防医学 | 20281篇 |
眼科学 | 3140篇 |
药学 | 10718篇 |
中国医学 | 686篇 |
肿瘤学 | 17975篇 |
出版年
2024年 | 33篇 |
2023年 | 292篇 |
2022年 | 513篇 |
2021年 | 1123篇 |
2020年 | 688篇 |
2019年 | 877篇 |
2018年 | 22735篇 |
2017年 | 17970篇 |
2016年 | 20183篇 |
2015年 | 1692篇 |
2014年 | 1755篇 |
2013年 | 2032篇 |
2012年 | 8707篇 |
2011年 | 22703篇 |
2010年 | 19632篇 |
2009年 | 12284篇 |
2008年 | 20662篇 |
2007年 | 22846篇 |
2006年 | 1613篇 |
2005年 | 3210篇 |
2004年 | 4313篇 |
2003年 | 5152篇 |
2002年 | 3189篇 |
2001年 | 413篇 |
2000年 | 524篇 |
1999年 | 289篇 |
1998年 | 336篇 |
1997年 | 319篇 |
1996年 | 188篇 |
1995年 | 195篇 |
1994年 | 173篇 |
1993年 | 123篇 |
1992年 | 100篇 |
1991年 | 153篇 |
1990年 | 200篇 |
1989年 | 122篇 |
1988年 | 93篇 |
1987年 | 93篇 |
1986年 | 53篇 |
1985年 | 73篇 |
1984年 | 59篇 |
1983年 | 60篇 |
1982年 | 54篇 |
1981年 | 33篇 |
1980年 | 72篇 |
1978年 | 43篇 |
1974年 | 37篇 |
1938年 | 60篇 |
1932年 | 56篇 |
1930年 | 47篇 |
排序方式: 共有10000条查询结果,搜索用时 265 毫秒
31.
32.
Jerome Marley Julia Taylor Jane Brocksom Kath Schubach Andrea Nixon Paula Allchorne Susanne Vahr Lauridsen 《International Journal of Urological Nursing》2020,14(1):5-12
A series of three World Café events centred on the topic of developing an Educational Framework for Urological Nursing [EFUN] were held by the British Association of Urological Nurses [BAUN], the European Association of Urology Nurses [EAUN] and the Australian and New Zealand Urological Nursing Society [ANZUNS] between 2017 and 2019. About 376 urology nurses participated in these “conversations that matter” and generated 1047 individual response items that were grouped into themes to assist the three associations to take the creation of an EFUN to the next level. Areas explored centred on four aspects: what any agreed educational framework for urology nursing should contain; the academic level at which education should be provided; who should be recruited as collaborators on writing an educational framework and, lastly, just how any emergent framework should be used. Analysis of the conversational data indicate that there exists within the urological nursing community a collective wisdom regarding their educational needs and how these needs should be met. 相似文献
33.
Brenda Laky Isabella Alram Julia K. Frank Leo Pauzenberger Werner Anderl Karl-Heinz Wagner Philipp R. Heuberer 《Journal of orthopaedic research》2020,38(9):2074-2082
Increasing numbers of arthroplasties are also accompanied by postoperative infections. The main purpose was to evaluate preoperative serum bilirubin levels between patients with and without infections after shoulder and knee arthroplasties. For this retrospective case-control single-center study, a total of 108 patients were extracted from a prospectively collected database. Eighteen patients with infections after shoulder (n = 8) and knee (n = 10) arthroplasty were matched by age, gender, and implant type in a 1:5-scenario to 90 patients (40 shoulders and 50 knees) without postoperative infection. Demographic data, preoperative blood parameters, and postoperative infection-related outcomes were evaluated. Total bilirubin was the only preoperative parameter significantly different between the infection (8.21 ± 3.25 μmol/L or 0.48 ± 0.19 mg/dL) and noninfection (10.78 ± 4.62 μmol/L or 0.63 ± 0.27 mg/dL; P = .014) group, while C-reactive protein and other liver parameters were similar between the groups. Significantly more controls (92.1%) had preoperative bilirubin levels above 8.72 μmol/L or 0.51 mg/dL than cases (7.9%; P = .007). The 5-year infection survival-rate was 65.6% for patients with preoperative bilirubin levels < 8.72 μmol/L or < 0.51 mg/dL and 91.2% with ≥ 8.72 μmol/L or ≥ 0.51 mg/dL. Mildly decreased preoperative bilirubin levels with a cutoff at 8.72 μmol/L or 0.51 mg/dL were significantly associated to patients with infections after shoulder and knee arthroplasty. There were no differences in other blood parameters or comorbidities between patients with infections and their matched-controls. 相似文献
34.
Julia R Dorin 《Asian journal of andrology》2015,17(5):716-719
β-defensin peptides are a large family of antimicrobial peptides. Although they kill microbes in vitro and interact with immune cells, the precise role of these genes in vivo remains uncertain. Despite their inducible presence at mucosal surfaces, their main site of expression is the epididymis. Recent evidence suggests that a major function of these peptides is in sperm maturation. In addition to previous work suggesting this, work at the MRC Human Genetics Unit, Edinburgh, has shown that homozygous deletion of a cluster of nine β-defensin genes in the mouse results in profound male sterility. The spermatozoa derived from the mutants had reduced motility and increased fragility. Epididymal spermatozoa isolated from the cauda region of the homozygous mutants demonstrated precocious capacitation and increased spontaneous acrosome reactions compared with those from wild-types. Despite this, these mutant spermatozoa had reduced ability to bind to the zona pellucida of oocytes. Ultrastructural examination revealed a disintegration of the microtubule structure of mutant-derived spermatozoa isolated from the epididymal cauda region, but not from the caput. Consistent with premature acrosome reaction and hyperactivation, spermatozoa from mutant animals had significantly increased intracellular calcium content. This work demonstrates that in vivo β-defensins are essential for successful sperm maturation, and that their disruption alters intracellular calcium levels, which most likely leads to premature activation and spontaneous acrosome reactions that result in hyperactivation and loss of microtubule structure of the axoneme. Determining which of the nine genes are responsible for the phenotype and the relevance to human sperm function is important for future work on male infertility. 相似文献
35.
36.
37.
38.
39.
40.