全文获取类型
收费全文 | 7319篇 |
免费 | 316篇 |
国内免费 | 67篇 |
专业分类
耳鼻咽喉 | 43篇 |
儿科学 | 189篇 |
妇产科学 | 171篇 |
基础医学 | 881篇 |
口腔科学 | 186篇 |
临床医学 | 450篇 |
内科学 | 1668篇 |
皮肤病学 | 183篇 |
神经病学 | 618篇 |
特种医学 | 158篇 |
外科学 | 1062篇 |
综合类 | 26篇 |
一般理论 | 1篇 |
预防医学 | 618篇 |
眼科学 | 295篇 |
药学 | 324篇 |
中国医学 | 19篇 |
肿瘤学 | 810篇 |
出版年
2024年 | 5篇 |
2023年 | 40篇 |
2022年 | 120篇 |
2021年 | 243篇 |
2020年 | 105篇 |
2019年 | 191篇 |
2018年 | 198篇 |
2017年 | 118篇 |
2016年 | 152篇 |
2015年 | 194篇 |
2014年 | 260篇 |
2013年 | 352篇 |
2012年 | 574篇 |
2011年 | 608篇 |
2010年 | 301篇 |
2009年 | 308篇 |
2008年 | 548篇 |
2007年 | 516篇 |
2006年 | 507篇 |
2005年 | 501篇 |
2004年 | 446篇 |
2003年 | 356篇 |
2002年 | 373篇 |
2001年 | 52篇 |
2000年 | 42篇 |
1999年 | 41篇 |
1998年 | 56篇 |
1997年 | 51篇 |
1996年 | 50篇 |
1995年 | 44篇 |
1994年 | 25篇 |
1993年 | 24篇 |
1992年 | 32篇 |
1991年 | 21篇 |
1990年 | 20篇 |
1989年 | 26篇 |
1988年 | 20篇 |
1987年 | 14篇 |
1986年 | 13篇 |
1985年 | 14篇 |
1984年 | 16篇 |
1983年 | 15篇 |
1982年 | 14篇 |
1981年 | 10篇 |
1980年 | 5篇 |
1979年 | 8篇 |
1977年 | 9篇 |
1976年 | 6篇 |
1963年 | 4篇 |
1936年 | 4篇 |
排序方式: 共有7702条查询结果,搜索用时 15 毫秒
41.
42.
Alejandra Aguilar-Crespo José Morales-Roselló Carlos Sánchez-Ajenjo Ana Valle-Tejero Raúl García-Marcos Alfredo Perales-Marín 《The journal of maternal-fetal & neonatal medicine》2019,32(4):573-578
Objective: To describe our cases of postpartum hemorrhage (PPH) with pelvic arterial embolization (PAE).Material and methods: All patients with PPH who underwent PAE in our center in the interval 2011–1016 were retrospectively studied, evaluating the technical procedure, clinical results, and subsequent fertility.Results: There were 33 cases of PPH with PAE. The majority occurred in primiparous women (N?=?22, 66.6%) who delivered vaginally (N?=?20, 61%). In addition, most PPH with PAE cases had an early onset (N?=?26, 79%) and were caused by uterine atony (N?=?14, 42.4%). Success of PAE occurred in 27 (81.8%) cases and a satisfactory clinical follow-up was the rule, with 21 (64%) women recovering their normal menstruation, and six (18.2%) becoming pregnant in the following years.Conclusions: PAE is a safe and efficacious technique with minor complications. Moreover, it allows conservation of the uterus with preservation of fertility. 相似文献
43.
Alfredo Oliveros Ki Hyun Yoo Mohammad Abdur Rashid Ana Corujo-Ramirez Benjamin Hur Jaeyun Sung Yuanhang Liu John R. Hawse Doo-Sup Choi Detlev Boison Mi-Hyeon Jang 《Proceedings of the National Academy of Sciences of the United States of America》2022,119(28)
Chemotherapy-induced cognitive impairment (CICI) has emerged as a significant medical problem without therapeutic options. Using the platinum-based chemotherapy cisplatin to model CICI, we revealed robust elevations in the adenosine A2A receptor (A2AR) and its downstream effectors, cAMP and CREB, by cisplatin in the adult mouse hippocampus, a critical brain structure for learning and memory. Notably, A2AR inhibition by the Food and Drug Administration–approved A2AR antagonist KW-6002 prevented cisplatin-induced impairments in neural progenitor proliferation and dendrite morphogenesis of adult-born neurons, while improving memory and anxiety-like behavior, without affecting tumor growth or cisplatin’s antitumor activity. Collectively, our study identifies A2AR signaling as a key pathway that can be therapeutically targeted to prevent cisplatin-induced cognitive impairments. 相似文献
44.
45.
Amy C. Morrison Robert C. Reiner Jr. William H. Elson Helvio Astete Carolina Guevara Clara del Aguila Isabel Bazan Crystyan Siles Patricia Barrera Anna B. Kawiecki Christopher M. Barker Gissella M. Vasquez Karin Escobedo-Vargas Carmen Flores-Mendoza Alfredo A. Huaman Mariana Leguia Maria E. Silva Sarah A. Jenkins Wesley R. Campbell Eugenio J. Abente Robert D. Hontz Valerie A. Paz-Soldan John P. Grieco Neil F. Lobo Thomas W. Scott Nicole L. Achee 《Proceedings of the National Academy of Sciences of the United States of America》2022,119(26)
Over half the world’s population is at risk for viruses transmitted by Aedes mosquitoes, such as dengue and Zika. The primary vector, Aedes aegypti, thrives in urban environments. Despite decades of effort, cases and geographic range of Aedes-borne viruses (ABVs) continue to expand. Rigorously proven vector control interventions that measure protective efficacy against ABV diseases are limited to Wolbachia in a single trial in Indonesia and do not include any chemical intervention. Spatial repellents, a new option for efficient deployment, are designed to decrease human exposure to ABVs by releasing active ingredients into the air that disrupt mosquito–human contact. A parallel, cluster-randomized controlled trial was conducted in Iquitos, Peru, to quantify the impact of a transfluthrin-based spatial repellent on human ABV infection. From 2,907 households across 26 clusters (13 per arm), 1,578 participants were assessed for seroconversion (primary endpoint) by survival analysis. Incidence of acute disease was calculated among 16,683 participants (secondary endpoint). Adult mosquito collections were conducted to compare Ae. aegypti abundance, blood-fed rate, and parity status through mixed-effect difference-in-difference analyses. The spatial repellent significantly reduced ABV infection by 34.1% (one-sided 95% CI lower limit, 6.9%; one-sided P value = 0.0236, z = 1.98). Aedes aegypti abundance and blood-fed rates were significantly reduced by 28.6 (95% CI 24.1%, ∞); z = −9.11) and 12.4% (95% CI 4.2%, ∞); z = −2.43), respectively. Our trial provides conclusive statistical evidence from an appropriately powered, preplanned cluster-randomized controlled clinical trial of the impact of a chemical intervention, in this case a spatial repellent, to reduce the risk of ABV transmission compared to a placebo.Aedes-borne viral diseases (ABVDs) [e.g., dengue (DENV), chikungunya, Zika (ZIKV), and yellow fever] are devastating, expanding global public health threats that disproportionally affect low- and middle-income countries. DENV, one of the most rapidly increasing vector-borne infectious diseases, results in ∼400 million infections each year (1, 2), with 4 billion people at risk for infection annually (3). Currently, the primary means for ABVD prevention is controlling the primary mosquito vector, Aedes aegypti. Existing vector control interventions, however, have failed to prevent ABV transmission and epidemics (4–6).There is an urgent need to develop evidence-based guidance for the use of new and existing ABV vector control tools. The evidence base for vector control against ABVs is weak, despite considerable government investments in World Health Organization (WHO)-recommended control of larval habitats (larviciding, container removal) and ultra-low-volume insecticide spraying (4, 5, 7–9). These strategies continue to be implemented despite the lack of rigorously generated data from controlled clinical trials demonstrating they reduce ABV infection or disease (6). The only ABV intervention with a proven epidemiological impact in a cluster-randomized control trial (cRCT) assessed community mobilization to reduce mosquito larval habitats (10). A recent test-negative trial with Wolbachia-infected mosquitoes reported a significant reduction of DENV illness in Indonesia (11).Spatial repellents (SRs) are devices that contain volatile active ingredients that disperse in air. The active ingredients can repel mosquitoes from entering a treated space, inhibit attraction to human host cues, or disrupt mosquito biting and blood-feeding behavior and, thus, interfere with mosquito–human contact (12–14). Any of these outcomes reduce the probability of pathogen transmission. Pyrethroid-based SRs have shown efficacy in reducing malaria infections in China (15) and Indonesia (16). There have, however, been no clinical trials evaluating the protective efficacy (PE) of SRs against ABV infection or disease.To generate evidence for public health consideration, we conducted a double-blinded, parallel cRCT to demonstrate and quantify the PE of a transfluthrin-based SR to reduce ABV infection incidence over 2 y in a human cohort in Iquitos, Peru. 相似文献
46.
47.
Polyethylene glycol fusion associated with antioxidants: A new promise in the treatment of traumatic facial paralysis 下载免费PDF全文
48.
Piccoli M Trambaiolo P Salustri A Cerquetani E Posteraro A Pastena G Amici E Papetti F Marincola E La Carruba S Gambelli G 《Chest》2005,128(5):3413-3420
OBJECTIVES: The aim of this study was to assess the potential value of hand-carried ultrasound (HCU) devices in the diagnosis and follow-up of patients with pleural effusion (PE) after cardiac surgery. METHODS: Seventy consecutive patients were evaluated at bedside early after cardiac surgery, in the upright sitting position, using an HCU device on hospital admission and every 3 days until hospital discharge. The posterior chest wall was scanned along the paravertebral, scapular, and posterior axillary lines. For each hemithorax, an effusion index was derived as the sum of the intercostal spaces between the lower and upper limits of the PE along the lines of scanning, divided by 3. A standard chest radiograph was performed in all patients on hospital admission and at hospital discharge, and was qualitatively scored (0, absent; 1, small; 2, large PE). The findings of the HCU device and radiograph were compared using kappa statistics and the Kruskal-Wallis test. RESULTS: A chest ultrasound was feasible in all patients (mean [+/- SD] time, 5 +/- 2 min). Compared with the chest ultrasound, a physical examination showed a sensitivity of 69% and a specificity of 77%. On hospital admission, the HCU device detected a PE in 72 of 140 hemithoraxes. Agreement with the finding of the radiograph was 76% (kappa = 0.52). In 15 hemithoraxes, the HCU device revealed a PE that had not been diagnosed using the radiograph. Conversely, in 18 hemithoraxes a PE that had been diagnosed with a radiograph was not confirmed by the HCU device. The correlation between ultrasound and radiographic scores was statistically significant (p < 0.001). At hospital discharge, a PE was present in 31 of 140 hemithoraxes according to the findings of the HCU device, and in 38 of 140 hemithoraxes according to the findings of the radiograph (agreement, 78%; kappa = 0.44). CONCLUSIONS: In patients early after cardiac surgery, HCU devices allow rapid PE detection and improve the clinical diagnosis. Compared to a radiograph, this method offers the unique advantage of the bedside evaluation of patients without the need for radiation exposure. 相似文献
49.
50.
Locatelli F Gauly A Czekalski S Hannedouche T Jacobson SH Loureiro A Martin-Malo A Papadimitriou M Passlick-Deetjen J Ronco C Vanholder R Wizemann V;Membrane Permeability Outcome 《Blood purification》2008,26(1):100-104
Although results from observational and epidemiological studies suggested a survival benefit associated with high-flux hemodialysis, conclusive evidence from prospective randomized clinical trials has been lacking. Both the HEMO Study in the USA and the Membrane Permeability Outcome Study (MPO Study) in Europe are randomized studies investigating the effect of high- and low-flux hemodialysis on patient outcomes, even though there were some significant differences in the design of the two studies. An earlier randomized clinical trial could not show differences on patient survival between patient groups being treated with membranes of different material and permeability, but this trial was not designed specifically to examine this particular endpoint. Based on these previous experiences, the MPO Study addressed a hemodialysis patient population which was considered to be more susceptible to the intervention with high-flux dialysis. To identify these patients with an elevated risk, low serum albumin levels were chosen as an indicator; low serum albumin is associated with malnutrition, inflammation, atherosclerosis, and with increased risk of morbidity and mortality. Together with low serum albumin, patients had to be new to dialysis to be selected for the MPO Study. These particular considerations on patient selection, together with additional methodological refinements in the study design allow the conclusion that the MPO Study is valid on its own rather than being a European version of the HEMO Study. 相似文献