全文获取类型
收费全文 | 20025篇 |
免费 | 1635篇 |
国内免费 | 39篇 |
专业分类
耳鼻咽喉 | 167篇 |
儿科学 | 793篇 |
妇产科学 | 613篇 |
基础医学 | 2614篇 |
口腔科学 | 241篇 |
临床医学 | 2246篇 |
内科学 | 3795篇 |
皮肤病学 | 319篇 |
神经病学 | 2114篇 |
特种医学 | 333篇 |
外国民族医学 | 5篇 |
外科学 | 2143篇 |
综合类 | 187篇 |
一般理论 | 69篇 |
预防医学 | 2946篇 |
眼科学 | 276篇 |
药学 | 1268篇 |
1篇 | |
中国医学 | 38篇 |
肿瘤学 | 1531篇 |
出版年
2024年 | 44篇 |
2023年 | 290篇 |
2022年 | 506篇 |
2021年 | 939篇 |
2020年 | 570篇 |
2019年 | 788篇 |
2018年 | 899篇 |
2017年 | 633篇 |
2016年 | 652篇 |
2015年 | 720篇 |
2014年 | 944篇 |
2013年 | 1201篇 |
2012年 | 1654篇 |
2011年 | 1681篇 |
2010年 | 882篇 |
2009年 | 733篇 |
2008年 | 1247篇 |
2007年 | 1312篇 |
2006年 | 1053篇 |
2005年 | 979篇 |
2004年 | 907篇 |
2003年 | 805篇 |
2002年 | 589篇 |
2001年 | 121篇 |
2000年 | 104篇 |
1999年 | 105篇 |
1998年 | 121篇 |
1997年 | 86篇 |
1996年 | 50篇 |
1995年 | 61篇 |
1994年 | 51篇 |
1993年 | 50篇 |
1992年 | 77篇 |
1991年 | 62篇 |
1990年 | 63篇 |
1989年 | 57篇 |
1988年 | 43篇 |
1987年 | 42篇 |
1986年 | 44篇 |
1985年 | 47篇 |
1984年 | 40篇 |
1980年 | 22篇 |
1979年 | 28篇 |
1978年 | 25篇 |
1977年 | 23篇 |
1976年 | 28篇 |
1974年 | 32篇 |
1973年 | 27篇 |
1971年 | 24篇 |
1970年 | 24篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
Rachel Yaff Zisk 《Pain Management Nursing》2003,4(1):40-51
Though human pain has existed since the dawn of time, formal medical pain relief in the form of anesthesia and analgesia has been available only since the mid-nineteenth century. Even after these measures became available, they were used very selectively for the first 100 years of their existence. The youngest patients, especially, were denied pain relief, probably because they could not complain about their pain as articulately and as effectively as adult patients could. A desperate need existed for health care professionals to recognize and appreciate the fact that their youngest patients could suffer immensely and to adequately address the issue. This article reviews the evolution of knowledge and attitudes regarding young patients' pain and addresses why and how this process occurred. The evolution of knowledge was traced by reviewing the literature found in MEDLINE, CINAHL, and LEXIS-NEXIS searches and through hand searches of articles that were frequently cited. Physiologic, pharmacologic, ethical, and psychologic aspects of young patients' pain are addressed. A unique phenomenon arose from the data reviewed. The process of belief and changes in practice were encouraged not only by advances in science, but also by consumer demand. Advances in the past decade in the management of young patients' pain were profound, but are still not complete. Understanding the evolution surrounding pain recognition in young patients provides a stepping stone that can facilitate further improvements in the management of pain in young patients. 相似文献
4.
Lena Adamson 《The American journal of occupational therapy》2003,57(5):578-581
The purpose of the present study was to examine the self-image of a group of young persons with cerebral palsy. The respondents (3 girls and 4 boys, ages 12 to 17 years) were interviewed and asked to complete a personality inventory. The results from the personality inventory revealed that the respondents viewed themselves in a very positive manner and rated markedly higher than norm groups. This positive view corresponded well with the findings of the interview. The following conclusions are made: Further studies on self-image and the psychosocial development of adolescents with disabilities should (a) focus on the social interaction outside their immediate families, and (b) continue to use and develop methods where these adolescents can give voice to their own experiences and opinions. 相似文献
5.
6.
7.
Sheela R Geraghty Barbara S Davidson Barbara B Warner Amy L Sapsford Jeanne L Ballard Betsy A List Rachel Akers Ardythe L Morrow 《Journal of human lactation》2005,21(1):59-66
Although there are well-established clinical human milk banks in the United States, there are no milk banks specifically intended to foster research on human milk. The authors' goal was to establish a milk bank with a core data set to support exploratory and hypothesis-driven studies on human milk. Donations to the Cincinnati Children's Research Human Milk Bank are accepted within the context of ongoing, hypothesis-driven research or on an ad hoc basis. Donors must give informed consent, and scientists wishing to use the samples must have Institutional review board approval for their use. Development of more research human milk banks can potentially provide resources for multidisciplinary collaboration and advance the study of human milk and lactation. 相似文献
8.
Najat C Daw Wayne L Furman Clinton F Stewart Lisa C Iacono Mark Krailo Mark L Bernstein Janet E Dancey Rose Anne Speights Susan M Blaney James M Croop Gregory H Reaman Peter C Adamson 《Journal of clinical oncology》2005,23(25):6172-6180
PURPOSE: Epidermal growth factor receptor is expressed in pediatric malignant solid tumors. We conducted a phase I trial of gefitinib, an epidermal growth factor receptor tyrosine kinase inhibitor, in children with refractory solid tumors. PATIENTS AND METHODS: Gefitinib (150, 300, 400, or 500 mg/m2) was administered orally to cohorts of three to six patients once daily continuously until disease progression or significant toxicity. Pharmacokinetic studies were performed during course one (day 1 through 28). RESULTS: Of the 25 enrolled patients, 19 (median age, 15 years) were fully evaluable for toxicity and received 54 courses. Dose-limiting toxicity was rash in two patients treated with 500 mg/m2 and elevated ALT and AST in one patient treated with 400 mg/m2. The maximum-tolerated dose was 400 mg/m2/d. The most frequent non-dose-limiting toxicities were grade 1 or 2 dry skin, anemia, diarrhea, nausea, and vomiting. One patient with Ewing's sarcoma had a partial response. Disease stabilized for 8 to > or = 60 weeks in two patients with Wilms' tumor and two with brainstem glioma (one exophytic). At 400 mg/m2, the median peak gefitinib plasma concentration was 2.2 microg/mL (range, 1.2 to 3.6 microg/mL) and occurred at a median of 2.3 hours (range, 2.0 to 8.3 hours) after drug administration. The median apparent clearance and median half-life were 14.8 L/h/m2 (range, 3.8 to 24.8 L/h/m2) and 11.7 hours (range, 5.6 to 22.8 hours), respectively. Gefitinib systemic exposures were comparable with those associated with antitumor activity in adults. CONCLUSION: Oral gefitinib is well tolerated in children. Development of the drug in combination with cytotoxic chemotherapy will be pursued. 相似文献
9.
10.
Fetal lung growth in laryngeal atresia and tracheal agenesis 总被引:1,自引:0,他引:1
Three cases of airway obstruction in fetuses born at 21, 32 and 40 weeks gestation are reported. The first had laryngeal atresia, cystic dysplastic kidneys, oligohydramnios and immense fluid-filled lungs. The second had upper tracheal agenesis, a tracheo-oesophageal fistula, a cystic dysplastic horseshoe kidney, oligohydramnios and normal-sized lungs. The third had a pin-hole mucosal tract through an otherwise atretic larynx, normal kidneys, no oligohydramnios and normal-sized lungs. Lung weight:body weight ratios, radial alveolar or radial canalicular counts and point-counting of sections of lungs in cases 1 and 2 show that laryngeal or tracheal obstruction may prevent or reduce the pulmonary hypoplasia associated with renal dysplasia, and in cases 2 and 3, that grossly enlarged, hyperplastic lungs may not be seen unless obstruction is complete. 相似文献