全文获取类型
收费全文 | 1452篇 |
免费 | 121篇 |
国内免费 | 14篇 |
专业分类
耳鼻咽喉 | 12篇 |
儿科学 | 75篇 |
妇产科学 | 49篇 |
基础医学 | 211篇 |
口腔科学 | 17篇 |
临床医学 | 161篇 |
内科学 | 275篇 |
皮肤病学 | 38篇 |
神经病学 | 131篇 |
特种医学 | 73篇 |
外国民族医学 | 1篇 |
外科学 | 207篇 |
综合类 | 73篇 |
一般理论 | 3篇 |
预防医学 | 105篇 |
眼科学 | 15篇 |
药学 | 86篇 |
中国医学 | 2篇 |
肿瘤学 | 53篇 |
出版年
2022年 | 7篇 |
2021年 | 24篇 |
2020年 | 23篇 |
2019年 | 29篇 |
2018年 | 19篇 |
2017年 | 33篇 |
2016年 | 32篇 |
2015年 | 20篇 |
2014年 | 34篇 |
2013年 | 61篇 |
2012年 | 70篇 |
2011年 | 63篇 |
2010年 | 55篇 |
2009年 | 70篇 |
2008年 | 92篇 |
2007年 | 76篇 |
2006年 | 64篇 |
2005年 | 62篇 |
2004年 | 53篇 |
2003年 | 48篇 |
2002年 | 46篇 |
2001年 | 32篇 |
2000年 | 46篇 |
1999年 | 47篇 |
1998年 | 31篇 |
1997年 | 33篇 |
1996年 | 37篇 |
1995年 | 28篇 |
1994年 | 22篇 |
1993年 | 23篇 |
1992年 | 28篇 |
1991年 | 23篇 |
1990年 | 18篇 |
1989年 | 30篇 |
1988年 | 18篇 |
1987年 | 22篇 |
1986年 | 14篇 |
1985年 | 18篇 |
1984年 | 13篇 |
1983年 | 17篇 |
1982年 | 7篇 |
1981年 | 6篇 |
1980年 | 13篇 |
1979年 | 7篇 |
1977年 | 9篇 |
1976年 | 6篇 |
1975年 | 7篇 |
1973年 | 11篇 |
1972年 | 7篇 |
1966年 | 6篇 |
排序方式: 共有1587条查询结果,搜索用时 31 毫秒
31.
32.
33.
Institutional and individual learning curves for focused abdominal ultrasound for trauma: cumulative sum analysis 下载免费PDF全文
McCarter FD Luchette FA Molloy M Hurst JM Davis K Johannigman JA Frame SB Fischer JE 《Annals of surgery》2000,231(5):689-700
OBJECTIVE: To evaluate both institutional and individual learning curves with focused abdominal ultrasound for trauma (FAST) by analyzing the incidence of diagnostic inaccuracies as a function of examiner experience for a group of trauma surgeons performing the study in the setting of an urban level I trauma center. SUMMARY BACKGROUND DATA: Trauma surgeons are routinely using FAST to evaluate patients with blunt trauma for hemoperitoneum. The volume of experience required for practicing trauma surgeons to be able to perform this examination with a reproducible level of accuracy has not been fully defined. METHODS: The authors reviewed prospectively gathered data for all patients undergoing FAST for blunt trauma during a 30-month period. All FAST interpretations were validated by at least one of four methods: computed tomography, diagnostic peritoneal lavage, celiotomy, or serial clinical evaluations. Cumulative sum (CUSUM) analysis was used to describe the learning curves for each individual surgeon at target accuracy rates of 85%, 90%, and 95% and for the institution as a whole at target examination accuracy rates of 85%, 90%, 95%, and 98%. RESULTS: Five trauma surgeons performed 546 FAST examinations during the study period. CUSUM analysis of the aggregate experience revealed that the examiners as a group exceeded 90% accuracy at the outset of clinical examination. The level of accuracy did not improve with either increased frequency of performance or total examination experience. The accuracy rates observed for each trauma surgeon ranged from 87% to 98%. The surgeon with the highest accuracy rate performed the fewest examinations. No practitioner demonstrated improved accuracy with increased experience. CONCLUSIONS: Trauma surgeons who are newly trained in the use of FAST can achieve an overall accuracy rate of at least 90% from the outset of clinical experience with this modality. Interexaminer variations in accuracy rates, which are observed above this level of performance, are probably related more to issues surrounding patient selection and inherent limitations of the examination in certain populations than to practitioner errors in the performance or interpretation of the study. 相似文献
34.
This review correlates the imaging findings and histological appearances seen in chordomas in a series of patients presenting at our institution, together with a published literature review. A parallel presentation of photographs of imaging findings and microscopic histological findings is made, with the aim being to enhance recognition of this uncommon but clinically significant entity. 相似文献
35.
The effects of clonidine, an indirectly-acting cholinergic antagonist, on 5 behaviors elicited by atropine (locomotion, rearing, sniffing, grooming and gnawing) were studied in rats. Clonidine did not alter the prevalence or magnitude of atropine-elicited locomotion and rearing. In contrast, clonidine suppressed the occurrence and degree of 3 stereotyped behaviors, namely, sniffing, grooming and gnawing. This selectivity of clonidine suggests differences in the neural pathways subserving the various stereotyped motor activities. 相似文献
36.
Michael D. Dub Christopher A. Rothfusz Ahmed K. Emara Matthew Hadad Peter Surace Viktor E. Krebs Robert M. Molloy Nicolas S. Piuzzi 《Current reviews in musculoskeletal medicine》2022,15(4):311
Purpose of Review8.5 to 50% of total joint arthroplasty (TJA) patients are reported to have preoperative malnutrition. The narrative review identifies the relationship between preoperative malnutrition for TJA patients and postoperative outcomes as well as the use of perioperative nutritional intervention to improve postoperative complications.Recent FindingsBiochemical/laboratory, anthropometric, and clinical measures have been widely used to identify preoperative nutritional deficiency. Specifically, serum albumin is the most prevalent used marker in TJA because it has been proven to be correlated with protein-energy malnutrition due to the surgical stress response. However, there remains a sustained incidence of preoperative malnutrition in total knee arthroplasty (TKA) and total hip arthroplasty (THA) patients due to a lack of agreement among the available nutritional screening tools and utilization of isolated laboratory, anthropometric, and clinical variables. Previous investigations have also suggested preoperative malnutrition to be a prognostic indicator of complications in general, cardiac, vascular, and orthopaedic surgery specialties.SummarySerum albumin, prealbumin, transferrin, and total lymphocyte count (TLC) can be used to identify at-risk patients. It is important to employ these markers in the preoperative setting because malnourished TKA and THA patients have shown to have worse postoperative outcomes including prolonged length, increased reoperation rates, increased infection rates, and increased mortality rates. Although benefits from high-protein and high-anti-inflammatory diets have been exhibited, additional research is needed to confirm the use of perioperative nutritional intervention as an appropriate treatment for preoperative TJA patients. 相似文献
37.
38.
Lauren Molloy Elreda J. Douglas Coatsworth Scott D. Gest Nilam Ram Katharine Bamberger 《Prevention science》2016,17(8):925-936
Although the majority of evidence-based programs are designed for group delivery, group process and its role in participant outcomes have received little empirical attention. Data were collected from 20 groups of participants (94 early adolescents, 120 parents) enrolled in an efficacy trial of a mindfulness-based adaptation of the Strengthening Families Program (MSFP). Following each weekly session, participants reported on their relations to group members. Social network analysis and methods sensitive to intraindividual variability were integrated to examine weekly covariation between group process and participant progress, and to predict post-intervention outcomes from levels and changes in group process. Results demonstrate hypothesized links between network indices of group process and intervention outcomes and highlight the value of this unique analytic approach to studying intervention group process. 相似文献
39.
40.