全文获取类型
收费全文 | 7308篇 |
免费 | 391篇 |
国内免费 | 79篇 |
专业分类
耳鼻咽喉 | 86篇 |
儿科学 | 62篇 |
妇产科学 | 128篇 |
基础医学 | 1195篇 |
口腔科学 | 178篇 |
临床医学 | 490篇 |
内科学 | 1345篇 |
皮肤病学 | 209篇 |
神经病学 | 488篇 |
特种医学 | 425篇 |
外科学 | 914篇 |
综合类 | 27篇 |
预防医学 | 238篇 |
眼科学 | 101篇 |
药学 | 968篇 |
中国医学 | 160篇 |
肿瘤学 | 764篇 |
出版年
2024年 | 4篇 |
2023年 | 48篇 |
2022年 | 169篇 |
2021年 | 280篇 |
2020年 | 122篇 |
2019年 | 148篇 |
2018年 | 230篇 |
2017年 | 155篇 |
2016年 | 272篇 |
2015年 | 417篇 |
2014年 | 413篇 |
2013年 | 493篇 |
2012年 | 813篇 |
2011年 | 717篇 |
2010年 | 408篇 |
2009年 | 338篇 |
2008年 | 447篇 |
2007年 | 356篇 |
2006年 | 340篇 |
2005年 | 366篇 |
2004年 | 306篇 |
2003年 | 229篇 |
2002年 | 182篇 |
2001年 | 106篇 |
2000年 | 104篇 |
1999年 | 70篇 |
1998年 | 29篇 |
1997年 | 32篇 |
1996年 | 23篇 |
1995年 | 14篇 |
1994年 | 16篇 |
1993年 | 8篇 |
1992年 | 14篇 |
1991年 | 25篇 |
1990年 | 13篇 |
1989年 | 10篇 |
1988年 | 13篇 |
1987年 | 9篇 |
1986年 | 8篇 |
1985年 | 7篇 |
1984年 | 3篇 |
1981年 | 4篇 |
1979年 | 3篇 |
1976年 | 2篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1968年 | 1篇 |
1967年 | 1篇 |
1966年 | 2篇 |
排序方式: 共有7778条查询结果,搜索用时 15 毫秒
51.
52.
Novel oral transforming growth factor‐β signaling inhibitor EW‐7197 eradicates CML‐initiating cells 下载免费PDF全文
Kazuhito Naka Kaori Ishihara Yoshie Jomen Cheng Hua Jin Dong‐Hyun Kim Yoon‐Kang Gu Eun‐Sook Jeong Shaoguang Li Daniela S. Krause Dong‐Wook Kim Eunjin Bae Yoshihiro Takihara Atsushi Hirao Hiroko Oshima Masanobu Oshima Akira Ooshima Yhun Yhong Sheen Seong‐Jin Kim Dae‐Kee Kim 《Cancer science》2016,107(2):140-148
Recent strategies for treating CML patients have focused on investigating new combinations of tyrosine kinase inhibitors (TKIs) as well as identifying novel translational research agents that can eradicate CML leukemia‐initiating cells (CML‐LICs). However, little is known about the therapeutic benefits such CML‐LIC targeting therapies might bring to CML patients. In this study, we investigated the therapeutic potential of EW‐7197, an orally bioavailable transforming growth factor‐β signaling inhibitor which has recently been approved as an Investigational New Drug (NIH, USA), to suppress CML‐LICs in vivo. Compared to TKI treatment alone, administration of TKI plus EW‐7197 to CML‐affected mice significantly delayed disease relapse and prolonged survival. Notably, combined treatment with EW‐7197 plus TKI was effective in eliminating CML‐LICs even if they expressed the TKI‐resistant T315I mutant BCR‐ABL1 oncogene. Collectively, these results indicate that EW‐7197 may be a promising candidate for a new therapeutic that can greatly benefit CML patients by working in combination with TKIs to eradicate CML‐LICs. 相似文献
53.
Young Hun Kim Won Kee Lee Eung Bae Lee Ji Woong Son Dong Sun Kim Jae Yong Park 《Clinical lung cancer》2017,18(1):e13-e20
Background
Many patients with non–small-cell lung cancer (NSCLC) still develop tumor metastasis and recurrence after pulmonary resection and are the primary causes of lung cancer treatment failure and death. MicroRNAs (miRs) have central roles during tumor metastasis and many miR genes are potentially subjected to control by DNA methylation in multiple tumor types. Recently, miR-34 and miR-124 have been demonstrated as potential regulators of the metastasis process in several cancer types.Materials and Methods
We studied the methylation status of miR-34 and miR-124 families in 157 patients with NSCLC using methylation-specific polymerase chain reaction and evaluated the clinical effect of their methylation on the patients' prognosis.Results
Methylation was detected in 30.6% for miR-34a, 40.8% for miR-34b/c, 30.6% for miR-124-1, 49.7% for miR-124-2, and 51.6% for miR-124-3 in NSCLC tissue. miR-34b/c methylation was significantly associated with age, gender, smoking status, histologic type, and pathologic stage. miR-34b/c, miR-124-2, and miR-124-3 methylation were significantly associated with worse survival in all patients (adjusted hazard ratio [HRadj] for miR-34b/c, 3.34; 95% confidence interval [CI], 1.95-5.74; P < .0001; HRadj for miR-124-2, 1.99; 95% CI, 1.19-3.32; P = .009; and HRadj for miR-124-3, 2.10; 95% CI, 1.24-3.55; P = .006). When miR-34b/c and miR-124-3 methylation were combined, overall survival decreased as the number of methylations increased (Ptrend < .0001).Conclusion
These findings suggest that miR-34 and miR-124 loci methylation could be a tumor-associated frequent event during NSCLC tumorigenesis and could be used as powerful markers for the prognosis of patients with NSCLC. 相似文献54.
Hawk Kim Kyoo-Hyung Lee Sang Kyun Sohn Chul Won Jung Young Don Joo Sung Hyun Kim Byung Soo Kim Jung Hye Choi Jae-Yong Kwak Min Kyoung Kim Sung Hwa Bae Ho-Jin Shin Jong Ho Won Sukjoong Oh Won Sik Lee Jae-Hoo Park Sung-Soo Yoon 《Leukemia research》2013
We retrospectively investigated the incidence, risk factors, and outcomes of SOS (sinusoidal obstruction syndrome; previously veno-occlusive disease [VOD]) after allogeneic hematopoietic stem cell transplantation (alloHSCT) in aplastic anemia. Two hundred and sixty patients were included in the analysis. SOS developed in 7.3% (n = 19/260) of patients. Classical Cy (200 mg/m2)-ATG was the most common conditioning regimen (84.2%) in the SOS group. The SOS mortality rate was 4/19 (21.1%). Univariate analyses revealed that Cy 200 mg/m2 conditioning (p = 0.035), classical Cy-ATG conditioning (p = 0.007), and horse ATG conditioning (p < 0.001) were significant risk factors for developing SOS. Multivariate analysis revealed that only horse ATG conditioning was a poor prognostic factor (HR = 3.484; 95% CI 1.226–9.904; p = 0.002). Rabbit ATG (HR 12.719; 95% CI 2.332–69.373; p = 0.003) and weight gain > 10% (HR 35.655; 95% CI 2.208–575.805; p = 0.012) were risk factors in the overall SOS group. Both rabbit ATG conditioning and weight gain of more than 10% were associated with poor overall survival with a median of 1.2 months (5Y survival rate, any risk factor vs. none: 74.6% vs. 0.0%; p < 0.001; Fig. 2) in the SOS group. 相似文献
55.
This study aimed to determine the relationship between the serpentine pattern nerve roots (SNR) and prognosis after lumbar fusion for lumbar spinal stenosis (LSS) by comparing clinical outcomes in patients with or without a serpentine pattern. LSS patients with neurological symptoms often present with SNRs. Several studies have shown that LLS symptoms are worse in patients with SNRs. However, the relationship between SNR and outcome after spinal fusion surgery has not yet been established. A total of 332 patients who underwent spinal fusion surgery between January 1, 2010, and December 31, 2019, were enrolled. Patients were divided into those with a serpentine pattern (S group) and those without a serpentine pattern (N group). The prognosis of the 2 groups was compared using visual analog scale (VAS), Oswestry disability index, claudication distance, medication dose for leg dysesthesia, and glucose tolerance. A total of 113 patients had a serpentine pattern, while the remaining 219 did not. Symptom duration and presence of diabetes mellitus were significantly different between the 2 groups (N = 25.4, S = 32.6, P < .05). Changes in the VAS score for lower extremity pain between the 2 groups at 1 year after surgery showed that patients without a serpentine pattern had significantly better outcomes than those with a serpentine pattern (N: 2.7 ± 1.1 vs S: 4.1 ± 1.3; P < .001), despite the score change at 1 month showing no difference (N: 3.5 ± 0.9 vs S: 3.8 ± 1.0; P = .09). SNRs on MRI are more prevalent in diabetic patients and are a negative prognostic factor in lumbar fusion surgery for LSS. Our insights may help physicians decide the optimal surgical plan and predict the postoperative prognosis of patients with LSS. 相似文献
56.
Among various processes for manufacturing complex-shaped metal parts, additive manufacturing is highlighted as a process capable of reducing the wastage of materials without requiring a post-process, such as machining and finishing. In particular, it is a suitable new manufacturing technology for producing AISI H13 tool steel for hot-worked molds with complex cooling channels. In this study, we manufactured AISI H13 tool steel using the laser power bed fusion (LPBF) process and investigated the effects of tempering temperature and holding time on its microstructure and mechanical properties. The mechanical properties of the sub-grain cell microstructure of the AISI H13 tool steel manufactured using the LPBF process were superior to that of the H13 tool steel manufactured using the conventional method. These sub-grain cells decomposed and disappeared during the austenitizing process; however, the mechanical properties could be restored at a tempering temperature of 500 °C or higher owing to the secondary hardening and distribution of carbides. Furthermore, the mechanical properties deteriorated because of the decomposition of the martensite phase and the accumulation and coarsening of carbides when over-tempering occurred at 500 °C for 5 h and 550 °C for 3 h. 相似文献
57.
U Jin Cho Seongjin Wang Seonju Yi Yeon Hwa Choi Eun-Young Kim Jin A Kim Sanghwan Bae Jungyeon Yu Jangkyu Choi Young-Joon Park 《Osong Public Health and Research Perspectives》2022,13(4):262
ObjectivesIt is crucial to establish the characteristics of coronavirus disease 2019 (COVID-19) outbreaks at army training centers to develop preventive measures. Therefore, this study aimed to determine the COVID-19 transmission patterns and risk factors in a sequence of outbreaks at an army training center from June to August 2021.Methods This study included 1,324 trainees at an army training center where outbreaks occurred from June to August 2021. The outbreak was qualitatively analyzed according to the period, attack rate, demographic characteristics, vaccination history, and living areas. An aerodynamic experiment was performed to evaluate aerosol transmission in living areas.Results Three outbreaks occurred at the army training center from June to August 2021. The first, second, and third outbreaks lasted for 32, 17, and 24 days, and the attack rates were 12.8%, 18.1%, and 8.9%, respectively. Confirmed cases were distributed in all age groups. Recruits and the unvaccinated were at higher risk for COVID-19. The aerodynamic experiment verified the possibility of aerosol transmission within the same living area.Conclusion COVID-19 transmission at army training centers should be minimized through quarantine and post-admission testing during the latency period as part of integrated measures that include facility ventilation, vaccination, indoor mask-wearing, and social distancing. 相似文献
58.
Jun Yup Kim Jihoon Kang Beom Joon Kim Seong-Eun Kim Do Yeon Kim Keon-Joo Lee Hong-Kyun Park Yong-Jin Cho Jong-Moo Park Kyung Bok Lee Jae-Kwan Cha Ji Sung Lee Juneyoung Lee Ki Hwa Yang Ock Ran Hong Ji Hyeon Shin Jung Hyun Park Philip B. Gorelick Hee-Joon Bae 《Journal of Korean medical science》2022,37(36)
BackgroundThe association between endovascular treatment (EVT) case volume per hospital and clinical outcomes has been reported, but the exact volume threshold has not been determined. This study aimed to examine the case volume threshold in this context.MethodsNational audit data on the quality of acute stroke care in patients admitted via emergency department, within 7 days of onset, in hospitals that treated ≥ 10 stroke cases during the audit period were analyzed. Ischemic stroke cases treated with EVT during the last three audits (2013, 2014, and 2016) were selected for the analysis. Annual EVT case volume per hospital was estimated and analyzed as a continuous and a categorical variable (in quartiles). The primary outcome measure was 1-year mortality as a surrogate of 3-month functional outcome. As post-hoc sensitivity analysis, replication of the study results was examined using the 2018 audit data.ResultsWe analyzed 1,746 ischemic stroke cases treated with EVT in 120 acute care hospitals. The median annual EVT case volume was 12.0 cases per hospital, and mortality rates at 1 month, 3 months, and 1 year were 12.7%, 16.6%, and 23.3%, respectively. Q3 and Q4 had 33% lower odds of 1-year mortality than Q1. Adjustments were made for predetermined confounders. Annual EVT case volume cut-off value for 1-year mortality was 15 cases per year (P < 0.02). The same cut-off value was replicated in the sensitivity analysis.ConclusionAnnual EVT case volume was associated with 1-year mortality. The volume threshold per hospital was 15 cases per year. 相似文献
59.
60.
In the search for antiangiogenic agents from medicinal plants used in Vietnam, a methanol extract of the stem barks of Bombax ceiba was found to exhibit a significant antiangiogenic activity on in vitro tube formation of human umbilical venous endothelial cells (HUVEC). Bioactivity-guided fractionation and isolation carried out on this extract afforded lupeol as an active principle. At 50 and 30 microg/mL lupeol showed a marked inhibitory activity on HUVEC tube formation while it did not affect the growth of tumor cell lines such as SK-MEL-2, A549, and B16-F10 melanoma. 相似文献