全文获取类型
收费全文 | 1562篇 |
免费 | 125篇 |
国内免费 | 15篇 |
专业分类
耳鼻咽喉 | 4篇 |
儿科学 | 46篇 |
妇产科学 | 66篇 |
基础医学 | 185篇 |
口腔科学 | 31篇 |
临床医学 | 187篇 |
内科学 | 332篇 |
皮肤病学 | 14篇 |
神经病学 | 114篇 |
特种医学 | 219篇 |
外科学 | 179篇 |
综合类 | 57篇 |
预防医学 | 144篇 |
眼科学 | 15篇 |
药学 | 55篇 |
1篇 | |
中国医学 | 2篇 |
肿瘤学 | 51篇 |
出版年
2022年 | 13篇 |
2021年 | 25篇 |
2019年 | 26篇 |
2018年 | 31篇 |
2017年 | 25篇 |
2016年 | 25篇 |
2015年 | 32篇 |
2014年 | 28篇 |
2013年 | 33篇 |
2012年 | 54篇 |
2011年 | 57篇 |
2010年 | 37篇 |
2009年 | 35篇 |
2008年 | 37篇 |
2007年 | 53篇 |
2006年 | 56篇 |
2005年 | 64篇 |
2004年 | 48篇 |
2003年 | 52篇 |
2002年 | 50篇 |
2001年 | 42篇 |
2000年 | 44篇 |
1999年 | 32篇 |
1998年 | 35篇 |
1997年 | 34篇 |
1996年 | 34篇 |
1995年 | 31篇 |
1994年 | 26篇 |
1993年 | 41篇 |
1992年 | 32篇 |
1991年 | 28篇 |
1990年 | 27篇 |
1989年 | 29篇 |
1988年 | 35篇 |
1987年 | 51篇 |
1986年 | 45篇 |
1985年 | 36篇 |
1984年 | 23篇 |
1983年 | 24篇 |
1981年 | 20篇 |
1980年 | 21篇 |
1979年 | 25篇 |
1978年 | 19篇 |
1977年 | 17篇 |
1976年 | 17篇 |
1975年 | 18篇 |
1974年 | 18篇 |
1973年 | 17篇 |
1970年 | 14篇 |
1967年 | 11篇 |
排序方式: 共有1702条查询结果,搜索用时 31 毫秒
1.
B I Sparks 《Journal of the American Optometric Association》1990,61(6):471-473
The purpose of the study was to determine if optometry students who completed an externship at a military facility were influenced for or against future enlistment considerations. The responses of 62 students were evaluated over a period of 3 years using an original self-completion questionnaire. The results suggest that while the majority of students left their externship with a positive attitude toward the military practice of optometry, factors such as low salaries and lagging promotional considerations influenced most to overlook the military as a practice option. The important ramifications of the study, as well as potential threats to its validity, are discussed. 相似文献
2.
3.
4.
Ten thrombocytopenic patients (platelets < 10–24 × 10(9)/L) who were refractory to platelet transfusion were investigated for their responsiveness to staphylococcal protein A column therapy. Nine patients had previously been treated with steroids, intravenous immune globulin, and/or other forms of immunosuppressive therapy without improvement in their transfusion response. All patients were receiving multiple platelet transfusions without achieving 1-hour corrected count increments (CCIs) > or = 7500. Eight patients had antibodies that reacted with platelets and were directed against HLA class I antigens, ABO antigens, and/or platelet-specific alloantigens. Plasma (500-2000 mL) from each patient was passed over a protein A silica gel column and then returned to the patient. Patients received from 1 to 14 treatments. A positive response to protein A therapy was defined as at least a doubling of the pretreatment platelet count and/or two successive 10- to 120-minute posttransfusion CCIs > or = 7500. Following plasma treatments, 6 of 10 patients responded with daily platelet counts that averaged 48 +/− 11 × 10(9) per L as compared with counts of 16 +/− 7 × 10(9) per L (p < 0.0005) before treatment. Posttransfusion CCI values determined in four of these patients averaged 2480 +/− 810 and 10,010 +/− 3540 (p < 0.005) before and after treatment, respectively. In contrast, among the four unresponsive patients, platelet counts averaged 10 +/− 9 and 13 +/− 10 × 10(9) per L (p = NS), respectively, while posttransfusion CCIs were 700 +/− 1410 and 1520 +/− 2460 (p = NS), respectively.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
5.
Use of triple-lumen subclavian catheters for administration of total parenteral nutrition. 总被引:1,自引:0,他引:1
N Clark-Christoff V A Watters W Sparks P Snyder J P Grant 《JPEN. Journal of parenteral and enteral nutrition》1992,16(5):403-407
This study evaluated the safety of triple vs single-lumen catheters in intravenous nutrition. Patients who were judged likely to benefit from a triple-lumen catheter were randomized to receive either a single-lumen catheter, with additional peripheral or central venous access as needed, or a triple-lumen catheter. All patients were at increased risk of catheter-related infection because of one or more of the following conditions: > 60 years of age, breakdown of skin integrity, severe underlying illness, diagnosis of acute pancreatitis, recent head or neck surgery, or presence of a preexisting infection. Patients were excluded who had neutropenia, were immunosuppressed, had body burns > 40%, or had contaminated wounds in the subclavicular area. Of 204 patients entered between June 1989 and November 1991, 177 completed the required > or = 7 days of therapy. Seventy-eight of these patients were randomized to a single-lumen catheter and 99 to a triple-lumen catheter. Catheters were inserted and maintained by the Nutrition Support Team. Dressings were monitored daily and changed weekly using a bio-occlusive dressing. When parameters were met for a possible septic episode, simultaneous peripheral and central catheter blood cultures were obtained using the Isolator method. Catheter-related sepsis was considered present if the colony count from a central catheter lumen was > or = 5 times that of the peripheral blood. The incidence of catheter-related sepsis for single-lumen catheters was 2.6% (2 of 78) compared with 13.1% for triple-lumen catheters (13 of 99) (p < .01). No correlation was found with the number of insertion attempts, catheter days, or patient's age.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
6.
7.
Laurie Sparks PhD RN CPNP Madeleine Rush Ortman MSN RN PCNS Pamela Aubuchon BS CCLS 《Journal of Orthopaedic Nursing》2004,8(4):206
Caring for a child in a body cast is a stressful situation for most families and many families state they do not receive adequate information on how to care for their child. This paper presents a comprehensive guide on caring for a child in a body cast. It examines the physical care issues, transportation and cast care. An instrument for assessing the family’s ability to cope with caring for a child in a body cast is described, and further resources for parents and nurses are presented. 相似文献
8.
9.
10.
Intestinal obstruction proximal to a transition zone without an interposed physical barrier usually indicates Hirschsprung disease. The authors report one case of focal small bowel muscular thinning just distal to a transition zone that produced clinical and radiographic findings that simulated long-segment Hirschsprung disease in a 2-day-old infant. 相似文献