全文获取类型
收费全文 | 18417篇 |
免费 | 1471篇 |
国内免费 | 38篇 |
专业分类
耳鼻咽喉 | 129篇 |
儿科学 | 712篇 |
妇产科学 | 526篇 |
基础医学 | 2364篇 |
口腔科学 | 233篇 |
临床医学 | 2072篇 |
内科学 | 3485篇 |
皮肤病学 | 306篇 |
神经病学 | 1990篇 |
特种医学 | 312篇 |
外国民族医学 | 5篇 |
外科学 | 1983篇 |
综合类 | 145篇 |
一般理论 | 67篇 |
预防医学 | 2777篇 |
眼科学 | 266篇 |
药学 | 1148篇 |
1篇 | |
中国医学 | 38篇 |
肿瘤学 | 1367篇 |
出版年
2024年 | 43篇 |
2023年 | 283篇 |
2022年 | 487篇 |
2021年 | 914篇 |
2020年 | 552篇 |
2019年 | 765篇 |
2018年 | 866篇 |
2017年 | 623篇 |
2016年 | 630篇 |
2015年 | 700篇 |
2014年 | 910篇 |
2013年 | 1166篇 |
2012年 | 1610篇 |
2011年 | 1623篇 |
2010年 | 833篇 |
2009年 | 670篇 |
2008年 | 1148篇 |
2007年 | 1203篇 |
2006年 | 969篇 |
2005年 | 905篇 |
2004年 | 819篇 |
2003年 | 733篇 |
2002年 | 553篇 |
2001年 | 81篇 |
2000年 | 69篇 |
1999年 | 65篇 |
1998年 | 113篇 |
1997年 | 80篇 |
1996年 | 39篇 |
1995年 | 48篇 |
1994年 | 41篇 |
1993年 | 42篇 |
1992年 | 31篇 |
1991年 | 20篇 |
1990年 | 19篇 |
1989年 | 23篇 |
1987年 | 10篇 |
1986年 | 17篇 |
1985年 | 23篇 |
1984年 | 20篇 |
1983年 | 12篇 |
1982年 | 13篇 |
1981年 | 18篇 |
1980年 | 17篇 |
1978年 | 8篇 |
1977年 | 10篇 |
1976年 | 7篇 |
1975年 | 8篇 |
1974年 | 10篇 |
1972年 | 6篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Lauren Tingey Britta Mullany Rachel Chambers Ranelda Hastings Angelita Lee Anthony Parker 《AIDS care》2015,27(9):1087-1097
Potential for widespread transmission of HIV/AIDS among American Indian (AI) adolescents exists, yet no evidence-based interventions (EBIs) have been adapted and evaluated with this population. Intensive psychoeducation may improve knowledge and decision-making which could potentially translate to reductions in HIV risk behaviors. A peer group randomized controlled comparison of an adapted EBI vs. control was delivered over an eight-day summer basketball camp in one reservation-based tribal community to adolescents ages 13–19. Outcome data were gathered immediately post-camp and at 6 and 12 months follow-up. Self-selected peer groups were randomized to intervention (n = 138) or control (n = 129) conditions for a total sample of 267 participants (56.2% female), mean age 15.1 years (SD = 1.7). Intervention participants had better condom use self-efficacy post-camp (Adjusted Mean Difference [AMD] = ?0.75, p < 0.005) and at 6 (AMD = ?0.44, p < 0.005) and 12 months (AMD = ?0.23, p < 0.05) follow-up. Intervention participants also had higher HIV prevention and transmission knowledge (post-camp: AMD = 0.07, p < 0.01; 6 months: AMD = 0.06, p < 0.01) were more likely to believe condoms prevent sexually transmitted infections (post-camp: RR = 1.41, p < 0.005; 6 months: RR = 1.34, p < 0.05), to talk with an adult about HIV/AIDS (post-camp: RR=1.78, p < 0.005; 6 months: RR = 1.14, p < 0.005), had higher partner negotiation efficacy related to substance use during sex (post-camp: AMD = 0.37, p < 0.01), and were more likely to intend to use a condom (post-camp: RR = 1.39, p < 0.01). The adapted intervention had short- and medium-term impacts on AI adolescent risk for HIV/AIDS, but attenuated at 12 months. Intervention delivery through a community-based camp is feasible and acceptable with strong retention. Additional study is needed to evaluate the adapted intervention's impact on sexual risk behaviors and if booster sessions and parent involvement translate to long-term impacts. 相似文献
2.
In 1963, Goffman argued that forming a group based on shared stigma may provide benefits. However, there is no empirical research on whether perception that a separate, unique, coherent group exists (i.e., group entitativity) influences coping, such as educating others or secrecy, for the stigmatized individual or his or her spouse. Further, little is known about how spouses influence each other in terms of promoting the education of others about a stigmatizing condition, especially when it comes to the role of believing that stigma-based groups, to which they may both belong, exist. This study provides a step toward bridging this gap in the research by applying the label management model in efforts to understand coping for couples in which one spouse is diagnosed with genetic mutations leading to alpha-1 antitrypsin deficiency (AATD). This study included 50 married couples in which one spouse is diagnosed with genetic mutations leading to alpha-1 antitrypsin deficiency (AATD). We found that group entitativity related to those with AATD counterbalanced the influence of genetic stigma on spouses’ intentions to keep the diagnosis secret or to educate others about it. Intrapersonal and interpersonal influences appeared among spouses. Attention is needed on the power of creating groups for stigmatized persons and their relatives. Indeed, people live within a dynamic world of group entities, and multiple social identities including spousal and familial. While attention has been paid to the diffusion of stigmas to loved ones, less has been paid to the uplift of group entities for them. 相似文献
3.
4.
Sarah Averbach Othman Kakaire Rachel McDiehl Christine Dehlendorf Felicia Lester Jody Steinauer 《Contraception》2019,99(2):87-93
Objective
This study assessed whether immediate postpartum insertion of levonorgestrel contraceptive implants is associated with a difference in infant growth from birth to 6 months, onset of lactogenesis, or breastfeeding continuation at 3 and 6 months postpartum compared to delayed insertion at 6 to 8 weeks postpartum.Study design
We conducted a randomized trial of women in Uganda who desired contraceptive implants postpartum. We randomly assigned participants to receive either immediate (within 5 days of delivery) or delayed (6 to 8 weeks postpartum) insertion of a two-rod levonorgestrel contraceptive implant system. This is a prespecified secondary analysis evaluating breastfeeding outcomes. The primary outcome of this secondary analysis was change in infant weight; infants were weighed and measured at birth and 6 months. We used a validated questionnaire to assess onset of lactogenesis daily in person while participants were in the hospital, and then daily by phone after they left the hospital, until lactogenesis was documented. We used interviewer-administered questionnaires to assess breastfeeding continuation and concerns at 3 months and 6 months postpartum.Results
Among the 96 women randomized to the immediate group and the 87 women to the delayed group, the mean change in infant weight from birth to 6 months was similar between groups: 4632?g in the immediate group and 4407?g in the delayed group (p=.26). Among the 97 women who had not experienced lactogenesis prior to randomization, the median time to onset of lactogenesis did not differ significantly between the immediate and delayed groups (65?h versus 63?h; p=.84). Similar proportions of women in the immediate and delayed groups reported exclusive breastfeeding at 3 months (74% versus 71%; p=.74) and 6 months (48% versus 52%; p=.58).Conclusion
We found no association between the timing of postpartum initiation of levonorgestrel contraceptive implants and change in infant growth from birth to 6 months, onset of lactogenesis, or breastfeeding continuation at 3 or 6 months postpartum.Implications
This study provides evidence that immediate postpartum initiation of contraception implants does not have a deleterious effect on infant growth or initiation or continuation of breastfeeding. 相似文献5.
6.
7.
Rachel A. Woolrich Myra J. Cooper Hannah M. Turner 《Cognitive therapy and research》2006,30(6):735-748
Objective: The study explored the semantic content and origins of negative self-beliefs, and their functional links to “not eating enough” and other behaviors, in participants with anorexia nervosa (AN). Method: Fifteen women meeting DSM-IV criteria for AN were compared with 17 dieting and 18 non-dieting women matched on age and number of years of education. The main outcome measure was a semi-structured interview. Results: Six themes were identified in the beliefs of participants with AN. These were, in order of decreasing frequency, powerlessness (present in all but three AN participants), failure, defectiveness, unattractiveness, worthlessness and emptiness. Importantly, powerlessness and failure beliefs were consistently present independent of Beck Depression Inventory-II scores. The negative early life experiences associated with these beliefs had high distress and responsibility ratings. Participants with AN reported that they employed specific behaviors, particularly ‘not eating enough,’ and ‘placating others,’ to try to reduce the cognitive and emotional impact of their negative self-beliefs. Discussion: The findings are discussed in relation to the role of powerlessness and the function of “not eating enough” in cognitive theory and therapy for AN.
相似文献
相似文献
8.
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
9.