全文获取类型
收费全文 | 2665篇 |
免费 | 175篇 |
国内免费 | 4篇 |
专业分类
耳鼻咽喉 | 56篇 |
儿科学 | 120篇 |
妇产科学 | 83篇 |
基础医学 | 403篇 |
口腔科学 | 43篇 |
临床医学 | 237篇 |
内科学 | 507篇 |
皮肤病学 | 52篇 |
神经病学 | 346篇 |
特种医学 | 66篇 |
外国民族医学 | 1篇 |
外科学 | 364篇 |
综合类 | 15篇 |
预防医学 | 161篇 |
眼科学 | 54篇 |
药学 | 175篇 |
中国医学 | 3篇 |
肿瘤学 | 158篇 |
出版年
2023年 | 11篇 |
2022年 | 19篇 |
2021年 | 47篇 |
2020年 | 31篇 |
2019年 | 63篇 |
2018年 | 74篇 |
2017年 | 40篇 |
2016年 | 38篇 |
2015年 | 55篇 |
2014年 | 84篇 |
2013年 | 135篇 |
2012年 | 161篇 |
2011年 | 151篇 |
2010年 | 74篇 |
2009年 | 79篇 |
2008年 | 154篇 |
2007年 | 143篇 |
2006年 | 165篇 |
2005年 | 180篇 |
2004年 | 143篇 |
2003年 | 129篇 |
2002年 | 104篇 |
2001年 | 96篇 |
2000年 | 101篇 |
1999年 | 71篇 |
1998年 | 17篇 |
1997年 | 11篇 |
1996年 | 24篇 |
1995年 | 21篇 |
1994年 | 12篇 |
1993年 | 12篇 |
1992年 | 42篇 |
1991年 | 35篇 |
1990年 | 34篇 |
1989年 | 32篇 |
1988年 | 36篇 |
1987年 | 28篇 |
1986年 | 32篇 |
1985年 | 21篇 |
1984年 | 20篇 |
1983年 | 9篇 |
1982年 | 8篇 |
1981年 | 7篇 |
1980年 | 7篇 |
1979年 | 14篇 |
1978年 | 8篇 |
1975年 | 8篇 |
1974年 | 9篇 |
1971年 | 7篇 |
1967年 | 6篇 |
排序方式: 共有2844条查询结果,搜索用时 93 毫秒
1.
2.
Keren Cohen‐Hagai Andy Kotliroff Ilan Rozenberg Zeev Korzets Tali Zitman‐Gal Sydney Benchetrit 《Therapeutic apheresis and dialysis : official peer-reviewed journal of the International Society for Apheresis, the Japanese Society for Apheresis, the Japanese Society for Dialysis Therapy》2019,23(1):38-43
Infection is one of the leading causes of mortality in dialysis patients, second only to cardiovascular disease. This retrospective study assessed the efficacy and clinical outcomes of influenza vaccination among hemodialysis (HD) patients. In the 2014–2015 season, 104 of 164 (63.6%) HD patients were vaccinated for influenza by the outpatient community health system facilities. Significantly more patients, 159 of 170 (93.8%), were vaccinated in 2015–2016 by the hospital dialysis unit staff during an inpatient HD session (P <0.001). A trend toward fewer complications from influenza infection was observed in vaccinated patients. Among HD patients with diabetes (who comprised 56% of the study population), the incidence of influenza was 17% among nonvaccinated patients vs. 6.3% among those who were vaccinated (P =0.026). The inpatient vaccination policy resulted in a greater rate of vaccination. HD patients with diabetes benefit from influenza vaccination, with a significantly lower incidence of influenza infection. 相似文献
3.
4.
Kelly A. Springstroh Nancy J. Gal Amanda L. Ford Susan J. Whiting 《Journal of nutrition in gerontology and geriatrics》2016,35(3):193-208
The aim of this study was to determine if handgrip strength (HGS) is a predictor of nutritional risk in community-dwelling older adults. A cross-sectional study was carried out to determine the relationship between HGS and nutritional risk using SCREEN 1. The setting was Congregate Nutrition program meal sites (n = 10) in North Central Florida and included community-dwelling older adults participating in the Congregate Nutrition program. Older adults (n = 136; 77.1 ± 8.9 y; 45 M, 91 F) participated in the study. Nutritional risk was identified in 68% of participants, with 10% exhibiting clinically relevant weakness (men, HGS < 26 kg; women, HGS < 16 kg), suggesting a vulnerable population. HGS was weakly associated with nutritional risk as assessed by SCREEN 1 (AUC = 0.59), but alternate cutpoints, 33 kg for men (mean of both hands) and 22 kg for women (highest of either hand), provided the best comparison to nutritional risk. In community-dwelling older adults, HGS was weakly associated with nutritional risk assessed using traditional screening. However, as existing research supports the inclusion of HGS in malnutrition screening in acute care, further research into the usefulness of HGS and possibly other measures of functional status in nutrition risk screening of community-dwelling older adults may be warranted. 相似文献
5.
6.
Talia Harris Sivaranjan Uppala Naama Lev‐Cohain Yael Adler‐Levy David Shaul Atara Nardi‐Schreiber Gal Sapir Assad Azar Ayelet Gamliel Jacob Sosna J. Moshe Gomori Rachel Katz‐Brull 《NMR in biomedicine》2020,33(2)
Investigation of hyperpolarized substrate metabolism has been showing utility in real‐time determination of in‐cell and in vivo enzymatic activities. Intracellular reaction rates may vary during the course of a measurement, even on the very short time scales of visibility on hyperpolarized MR, due to many factors such as the availability of the substrate and co‐factors in the intracellular space. Despite this potential variation, the kinetic analysis of hyperpolarized signals typically assumes that the same rate constant (and in many cases, the same rate) applies throughout the course of the reaction as observed via the build‐up and decay of the hyperpolarized signals. We demonstrate here an acquisition approach that can null the need for such an assumption and enable the detection of instantaneous changes in the rate of the reaction during an ex vivo hyperpolarized investigation, (i.e. in the course of the decay of one hyperpolarized substrate dose administered to a viable tissue sample ex vivo). This approach utilizes hyperpolarized product selective saturating‐excitation pulses. Similar pulses have been previously utilized in vivo for spectroscopic imaging. However, we show here favorable consequences to kinetic rate determinations in the preparations used. We implement this acquisition strategy for studies on perfused tissue slices and develop a theory that explains why this particular approach enables the determination of changes in enzymatic rates that are monitored via the chemical conversions of hyperpolarized substrates. Real‐time changes in intracellular reaction rates are demonstrated in perfused brain, liver, and xenograft breast cancer tissue slices and provide another potential differentiation parameter for tissue characterization. 相似文献
7.
Sergio Gallego Riestra Isolina Riaño Galán 《Atencion primaria / Sociedad Espa?ola de Medicina de Familia y Comunitaria》2018,50(2):74-78
There is an increasing request by patients or their representatives not to have some data registered in their clinical history or if such data exists to be deleted. Without doubt, this is so because such clinical data is accessed by various professionals who in most cases are not directly involved in caring for such patients. On the other hand, such data is copied and iteratively and unnecessary reproduced in various discharge reports and others forms. The problem arises when such controversial data refer to particularly sensitive clinical aspects such as assisted reproduction techniques, which invades personal and family privacy. Therefore, the question is who determines what data should be recorded in the medical records and according to what criteria should be taken that decision? 相似文献
8.
9.
Glandular odontogenic cyst: treatment and recurrence. 总被引:3,自引:0,他引:3
Ilana Kaplan Gavriel Gal Yakir Anavi Ronen Manor Shlomo Calderon 《Journal of oral and maxillofacial surgery》2005,63(4):435-441
PURPOSE: To investigate the correlation between clinical characteristics, radiologic features, treatment modalities, and treatment outcome of glandular odontogenic cyst, and to suggest a treatment protocol based on these results. PATIENTS AND METHODS: The study included a total of 56 cases, 49 from the literature and 7 new cases. Demographic data, locularity and radiographic extension, cortical plate integrity, treatment modalities, follow-up, and recurrence were analyzed. RESULTS: There were 34 male and 22 female patients aged 14 to 74 years (mean, 48 years). The mandible was involved in 41 cases (73.2%) and the maxilla in 15 (26.8%), predominantly in the anterior region; 53.6% of the lesions were unilocular and 46.4% multilocular. Large lesions were found in 78.5% of cases. Cortical integrity was compromised in 53.6% (cortical perforation in 39.3% and thinning or erosion of the cortical plate in 14.3%). Recurrence occurred at a rate of 29.2%, within 0.5 to 7 years (mean, 2.9 years). Mean follow-up was also 2.9 years. Two patients had 3 recurrences each. Recurrence was associated with minor surgery such as enucleation or curettage; none of the patients treated by peripheral ostectomy, marginal resection, or partial jaw resection had a recurrence. Compared with the patients without recurrence, the recurrence group had a higher frequency of multilocularity than the nonrecurrent group (64.3% vs 41.2%) and of compromised cortical integrity (71.4% vs 47.1%). CONCLUSION: Glandular odontogenic cyst is an aggressive lesion. Treatment by enucleation or curettage alone is associated with a high recurrence rate. Small unilocular lesions can be treated by enucleation. In large uni- or multilocular lesions, an initial biopsy is recommended. Surgical treatment of large lesions should include enucleation with peripheral ostectomy for unilocular cases and marginal resection or partial jaw resection in multilocular cases. Marsupialization followed by second phase surgery is an option for lesions approaching vital structures. Follow-up should continue for at least 3 years (up to 7 years in cases with features associated with increased risk). 相似文献
10.