全文获取类型
收费全文 | 20706篇 |
免费 | 1643篇 |
国内免费 | 45篇 |
专业分类
耳鼻咽喉 | 188篇 |
儿科学 | 673篇 |
妇产科学 | 538篇 |
基础医学 | 2693篇 |
口腔科学 | 350篇 |
临床医学 | 2376篇 |
内科学 | 4297篇 |
皮肤病学 | 283篇 |
神经病学 | 2245篇 |
特种医学 | 504篇 |
外科学 | 2295篇 |
综合类 | 144篇 |
一般理论 | 18篇 |
预防医学 | 2808篇 |
眼科学 | 254篇 |
药学 | 1187篇 |
中国医学 | 11篇 |
肿瘤学 | 1530篇 |
出版年
2024年 | 42篇 |
2023年 | 348篇 |
2022年 | 586篇 |
2021年 | 1193篇 |
2020年 | 725篇 |
2019年 | 999篇 |
2018年 | 1083篇 |
2017年 | 709篇 |
2016年 | 732篇 |
2015年 | 815篇 |
2014年 | 1024篇 |
2013年 | 1313篇 |
2012年 | 1862篇 |
2011年 | 1816篇 |
2010年 | 869篇 |
2009年 | 719篇 |
2008年 | 1175篇 |
2007年 | 1009篇 |
2006年 | 902篇 |
2005年 | 736篇 |
2004年 | 615篇 |
2003年 | 521篇 |
2002年 | 448篇 |
2001年 | 148篇 |
2000年 | 149篇 |
1999年 | 123篇 |
1998年 | 73篇 |
1997年 | 59篇 |
1995年 | 46篇 |
1994年 | 42篇 |
1992年 | 79篇 |
1991年 | 95篇 |
1990年 | 86篇 |
1989年 | 84篇 |
1988年 | 94篇 |
1987年 | 73篇 |
1986年 | 69篇 |
1985年 | 70篇 |
1984年 | 62篇 |
1981年 | 34篇 |
1980年 | 34篇 |
1979年 | 58篇 |
1978年 | 44篇 |
1977年 | 46篇 |
1976年 | 39篇 |
1975年 | 36篇 |
1974年 | 45篇 |
1973年 | 43篇 |
1972年 | 40篇 |
1970年 | 34篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
131.
Jennifer L. Reed Evaline A. Alessandrini Judith Dexheimer Andrea Kachelmeyer Maurizio Macaluso Nanhua Zhang Jessica A. Kahn 《The Journal of adolescent health》2021,68(1):57-64
PurposeAdolescents represent more than half of the newly diagnosed sexually transmitted infections in the U.S. annually. Emergency departments (EDs) may serve as an effective, nontraditional setting to screen for chlamydia/gonorrhea (CT/GC). The objective was to evaluate the effectiveness of a universally offered CT/GC screening program in two pediatric ED settings.MethodsThis was a prospective, delayed start pragmatic study conducted over 18 months in two EDs within the same academic institution among ED adolescents aged 14–21 years with any chief complaint. Using a tablet device, adolescents were confidentially informed of CT/GC screening recommendations and were offered screening. If patients agreed to CT/GC testing, a clinical decision support tool was triggered to inform the provider and order testing. The main and key secondary outcomes were the proportion of CT/GC testing and positive CT/GC test results in each respective ED.ResultsBoth EDs experienced modest but statistically significant increases in CT/GC testing post- versus pre-intervention (main: 11.5% vs. 7.9%; confidence interval [CI]: 2.9–4.2; p < .0001 and satellite: 3.8% vs. 2.6%; 95% CI: .7–1.7; p < .0001). Among those tested, the positivity rate at the main ED did not significantly change post- versus pre-intervention (24.1% vs. 23.2%; 95% CI: ?1.9 to 3.8; p = .71) but significantly decreased at the satellite ED (7.6% vs. 14.8%; 95% CI: ?12.2 to ?2.2; p = .01).ConclusionsA universally offered screening intervention increased the proportion of adolescents who were tested at both EDs and the detection rates for CT/GC at the main ED, but patient acceptance of screening was low. 相似文献
132.
Grazieli Maboni Jessica A. Elbert Justin M. Stilwell Susan Sanchez 《Emerging infectious diseases》2021,27(3):979
Severe nasal Prototheca cutis infection was diagnosed postmortem for an immunocompetent cat with respiratory signs. Pathologic examination and whole-genome sequencing identified this species of algae, and susceptibility testing determined antimicrobial resistance patterns. P. cutis infection should be a differential diagnosis for soft tissue infections of mammals. 相似文献
133.
Lobo Sylvia J. Lin Jessica G. Vais Simone Wang Dongyu Adegoke Tejumola M. Wu Wan-Ju Steer-Massaro Courtney 《Journal of immigrant and minority health / Center for Minority Public Health》2022,24(1):111-117
Journal of Immigrant and Minority Health - Although multiple studies have shown that resettled refugee women are less likely to receive preventative cancer screenings like pap smears and... 相似文献
134.
135.
136.
Sean Cowlishaw Olivia Metcalf Tracey Varker Caleb Stone Robyn Molyneaux Lisa Gibbs Karen Block Louise Harms Colin MacDougall H. Colin Gallagher Richard Bryant Ellie Lawrence‐Wood Connie Kellett Meaghan O'Donnell David Forbes 《Journal of traumatic stress》2021,34(1):46-55
Anger is an important dimension of affect and a prominent feature of posttraumatic mental health, but it is commonly overlooked in postdisaster settings. We aimed to examine the distribution and implications of significant anger problems in the aftermath of a natural disaster, via analyses of Beyond Bushfires survey data from 736 residents of rural communities 5 years after the 2009 Black Saturday bushfires in Victoria, Australia. Assessments included the five‐item Dimensions of Anger Reaction (DAR‐5) scale along with measures of PTSD, depression, and significant mental illness, and indicators of life satisfaction, suicidality, hostile aggressive behavior, and violence exposure. The results indicated that approximately 10% of respondents from areas highly affected by the bushfires scored above the provisional cutoff criteria for significant anger problems on the DAR‐5, which was a more than 3‐fold increase, OR = 3.26, relative to respondents from areas of low‐to‐moderate bushfire impact. The rates were higher among women, younger participants, and those who were unemployed, and co‐occurred commonly, although not exclusively, with other postdisaster mental health problems. Anger problems were also associated with lower life satisfaction, β = ?.31, an 8‐fold increase in suicidal ideation, OR = 8.68, and a nearly 13‐fold increase in hostile aggressive behavior, OR = 12.98. There were associations with anger problems and violence exposure, which were reduced when controlling for covariates, including probable PTSD. The findings provide evidence indicating that anger is a significant issue for postdisaster mental health and should be considered routinely alongside other posttraumatic mental health issues. 相似文献
137.
Richard J. Visconti Kyle Kolaja Jessica A. Cottrell 《Journal of bone and mineral research》2021,36(10):1914-1930
Human myeloma bone disease (MBD) occurs when malignant plasma cells migrate to the bone marrow and commence inimical interactions with stromal cells, disrupting the skeletal remodeling process. The myeloma cells simultaneously suppress osteoblastic bone formation while promoting excessive osteoclastic resorption. This bone metabolism imbalance produces osteolytic lesions that cause chronic bone pain and reduce trabecular and cortical bone structural integrity, and often culminate in pathological fractures. Few bone models exist that enable scientists to study MBD and the effect therapies have on restoring the bone metabolism imbalance. The purpose of this research was to develop a well characterized three-dimensional (3D) bone organoid that could be used to study MBD and current or potential treatment options. First, bone marrow stromal cell–derived osteoblasts (OBs) mineralized an endosteal-like extracellular matrix (ECM) over 21 days. Multiple analyses confirmed the generation of hydroxyapatite (HA)-rich bone-like tissue fragments that were abundant in alkaline phosphatase, calcium, and markers of osteoblastic gene expression. On day 22, bone marrow macrophage (BMM)–derived osteoclasts (OCs) were introduced to enhance the resorptive capability of the model and recapitulate the balanced homeostatic nature of skeletal remodeling. Tartrate-resistant acid phosphatase 5b (TRAcP-5b), type I collagen C-telopeptide (CTX-1), and gene expression analysis confirmed OC activity in the normal 3D organoid (3D in vitro model of normal bonelike fragments [3D-NBF]). On day 30, a human multiple myeloma (MM)–derived plasmacytoma cell line was introduced to the 3D-NBF to generate the 3D-myeloma bone disease organoid (3D-MBD). After 12 days, the 3D-MBD had significantly reduced total HA, increased TRAcP-5b levels, increases levels of CTX-1, and decreased expression of osteoblastic genes. Therapeutic intervention with pharmaceutical agents including an immunomodulatory drug, a bisphosphonate, and monoclonal restored HA content and reduced free CTX-1 in a dose-dependent manner. This osteogenically functional model of MBD provides a novel tool to study biological mechanisms guiding the disease and to screen potential therapeutics. © 2021 American Society for Bone and Mineral Research (ASBMR). 相似文献
138.
BackgroundCurrent practice patterns for adrenalectomy among endocrine surgeons is a limited area of study. Here we survey relatively junior endocrine surgeons regarding educational experiences in adrenalectomy and correlate these with current practice.MethodsAn electronic survey was sent to recent AAES-accredited fellowships graduates (2014–2019), querying adrenalectomy volume and approaches during fellowship and current practice patterns.ResultsMost graduates (63.2%) performed >20 adrenalectomies in fellowship. Exposure was greatest to open (94.1%) and laparoscopic transabdominal (92.6%) adrenalectomy, followed by retroperitoneoscopic (86.7%). The majority (73.5%) of respondents stated their current practice patterns are the same as their exposure during training. Preoperative diagnosis, side of lesion, and patient comorbidities were all ranked as significant predictors affecting choice of approach (p < 0.001).ConclusionThe large majority of AAES fellowship graduates receive high-volume adrenalectomy experience in several approaches. The technique to which a trainee was exposed to most frequently was the greatest predictor for preferential approach in current practice. 相似文献
139.
BackgroundThe purpose of this study was to evaluate the roles of women at national trauma meetings.MethodsAvailable scientific programs for the American Association for the Surgery of Trauma (2013-19), Eastern Association for the Surgery of Trauma (2010-19), and Western Trauma Association (2010-19) as well as the Scudder Oration at the American College of Surgeons (1963–2019), were reviewed for names of participants and categorized by gender.ResultsWomen made up 963 of 2746 (35.1%) of presenters, 252 of 1020 (24.7%) of discussants, 116 of 622 (18.6%) of moderators of scientific sessions, 189 of 707 (26.7%) of panelists, and 69 of 254 (27.2%) of panel moderators. Only 12 of 126 (9.5%) of named lectures or presidential addresses were given by women.ConclusionsThe low rate of female named speakers suggests that there remains a “glass ceiling” when it comes to upper-level participation in national trauma meetings. 相似文献
140.