全文获取类型
收费全文 | 9579篇 |
免费 | 732篇 |
国内免费 | 230篇 |
专业分类
耳鼻咽喉 | 60篇 |
儿科学 | 425篇 |
妇产科学 | 147篇 |
基础医学 | 2200篇 |
口腔科学 | 180篇 |
临床医学 | 841篇 |
内科学 | 1688篇 |
皮肤病学 | 103篇 |
神经病学 | 1333篇 |
特种医学 | 451篇 |
外科学 | 423篇 |
综合类 | 893篇 |
一般理论 | 5篇 |
预防医学 | 530篇 |
眼科学 | 276篇 |
药学 | 392篇 |
1篇 | |
中国医学 | 30篇 |
肿瘤学 | 563篇 |
出版年
2023年 | 190篇 |
2022年 | 123篇 |
2021年 | 250篇 |
2020年 | 360篇 |
2019年 | 356篇 |
2018年 | 284篇 |
2017年 | 331篇 |
2016年 | 324篇 |
2015年 | 378篇 |
2014年 | 445篇 |
2013年 | 782篇 |
2012年 | 429篇 |
2011年 | 494篇 |
2010年 | 428篇 |
2009年 | 429篇 |
2008年 | 495篇 |
2007年 | 475篇 |
2006年 | 528篇 |
2005年 | 429篇 |
2004年 | 378篇 |
2003年 | 368篇 |
2002年 | 311篇 |
2001年 | 351篇 |
2000年 | 168篇 |
1999年 | 179篇 |
1998年 | 155篇 |
1997年 | 146篇 |
1996年 | 121篇 |
1995年 | 123篇 |
1994年 | 101篇 |
1993年 | 80篇 |
1992年 | 53篇 |
1991年 | 56篇 |
1990年 | 41篇 |
1989年 | 38篇 |
1988年 | 34篇 |
1987年 | 33篇 |
1986年 | 26篇 |
1985年 | 31篇 |
1984年 | 33篇 |
1983年 | 18篇 |
1982年 | 26篇 |
1981年 | 42篇 |
1980年 | 23篇 |
1979年 | 12篇 |
1978年 | 20篇 |
1977年 | 9篇 |
1976年 | 11篇 |
1974年 | 4篇 |
1973年 | 5篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Lars Burdorf Christopher T. Laird Donald G. Harris Margaret R. Connolly Zahra Habibabady Emily Redding Natalie A. O'Neill Arielle Cimeno Dawn Parsell Carol Phelps David Ayares Agnes M. Azimzadeh Richard N. Pierson 《American journal of transplantation》2022,22(1):28-45
Galactosyl transferase knock-out pig lungs fail rapidly in baboons. Based on previously identified lung xenograft injury mechanisms, additional expression of human complement and coagulation pathway regulatory proteins, anti-inflammatory enzymes and self-recognition receptors, and knock-down of the β4Gal xenoantigen were tested in various combinations. Transient life-supporting GalTKO.hCD46 lung function was consistently observed in association with either hEPCR (n = 15), hTBM (n = 4), or hEPCR.hTFPI (n = 11), but the loss of vascular barrier function in the xenograft and systemic inflammation in the recipient typically occurred within 24 h. Co-expression of hEPCR and hTBM (n = 11) and additionally blocking multiple pro-inflammatory innate and adaptive immune mechanisms was more consistently associated with survival >1 day, with one recipient surviving for 31 days. Combining targeted genetic modifications to the lung xenograft with selective innate and adaptive immune suppression enables prolonged initial life-supporting lung function and extends lung xenograft recipient survival, and illustrates residual barriers and candidate treatment strategies that may enable the clinical application of other organ xenografts. 相似文献
2.
Y-chromosomal haplogroups determined by Y-chromosomal single nucleotide polymorphisms (Y-SNPs) allow paternal lineage identification and paternal biogeographic ancestry inference, which has attracted a lot of interest in the forensic community. Recently, a comprehensive Y-SNP tool with dominant markers targeting haplogroups in R, E and I branches has been reported, which allows the inference of 640 Y haplogroups. It had a very good performance and could provide a high level of Y haplogroup resolution in most populations. However, the predominant haplogroups in the Chinese populations are O, C and N, suggesting that more Y-SNPs under these clades are needed to achieve the population-specific high resolution. Herein, aiming at the Chinese population, we presented a largely improved custom Y-SNP MPS panel that contains 256 carefully ascertained Y-SNPs based on our previous studies, and evaluated this panel via a series of tests, including the tests for concordance, repeatability, sensitivity, specificity, and stability, as well as the mixture, degraded and case-type sample analysis. The preliminary developmental validation demonstrated that this panel was highly reliable, sensitive, specific, and robust. In the sensitivity test, even when the DNA input was reduced to as low as 0.5 ng, the sample could still be assigned to the correct Y haplogroup. For mixture analysis, even the 1:99 (Male: Female) mixtures had no effects on the assignation of the Y haplogroup of the male contributor. In summary, this assay has provided a high-resolution Y-chromosomal haplogrouping workflow to determine a male’s paternal lineage and/or paternal biogeographic ancestry and could be widely used for Chinese Y-chromosomal haplogroups dissection. 相似文献
3.
《Diagnostic Histopathology》2021,27(10):397-404
The system of death investigation in England and Wales is complex, resulting in a distinction between ‘non-forensic’ and ‘forensic’ medicolegal autopsies. This article reviews the medicolegal investigation of sudden death and the actions of the police at the scene, and features in the history, external examination and internal examination that ‘non-forensic’ pathologists should be attune to in their everyday practice. 相似文献
4.
Qiaojun Zeng Tiantian Tang Biru Huang Shiyi Bu Yingqi Xiao Yumeng Dai Zixin Wei Linjie Huang Shanping Jiang 《The Journal of international medical research》2021,49(4)
ObjectiveSingle nucleotide polymorphisms (SNPs) of pentraxin 3 (PTX3) are associated with various outcomes of lung infections. This study aimed to analyze the relationship between PTX3 polymorphisms and the severity of community-acquired pneumonia (CAP).MethodsThis is a retrospective case-control study comprising 43 patients with severe CAP (SCAP) and 97 patients with non-severe CAP. Three SNPs in the PTX3 gene (rs2305619, rs3816527, and rs1840680) from peripheral blood samples were genotyped by real-time polymerase chain reaction. The association between each SNP and the CAP severity was analyzed by logistic regression analysis.ResultsWe found that the rs1840680 polymorphism was significantly associated with CAP clinical severity. However, no such association was observed for the genotypes and allele frequencies of rs2305619 or rs3816527. The PTX3 rs1840680 AG genotype was an independent factor for a lower risk of SCAP after multivariate logistic regression analysis. Male sex and coronary heart disease were associated with an increased risk of SCAP.ConclusionsThe PTX3 rs1840680 AG genotype was found to be associated with a lower risk of SCAP, and may serve as a potential protective biomarker to help clinical judgment and management. 相似文献
5.
6.
Sindbis virus (SINV), a positive-sense single stranded RNA virus that causes mild symptoms in humans, is transmitted by mosquito bites. SINV reverse genetics have many implications, not only in understanding alphavirus transmission, replication cycle, and virus-host interactions, but also in biotechnology and biomedical applications. The rescue of SINV infectious particles is usually achieved by transfecting susceptible cells (BHK-21) with SINV-infectious mRNA genomes generated from cDNA constructed via in vitro translation (IVT). That procedure is time consuming, costly, and relies heavily on reagent quality. Here, we constructed a novel infectious SINV cDNA construct that expresses its genomic RNA in yeast cells controlled by galactose induction. Using spheroplasts made from this yeast, we established a robust polyethylene glycol-mediated yeast: BHK-21 fusion protocol to rescue infectious SINV particles. Our approach is timesaving and utilizes common lab reagents for SINV rescue. It could be a useful tool for the rescue of large single strand RNA viruses, such as SARS-CoV-2. 相似文献
7.
8.
Altayeb Abdalla Ahmed 《Medicine》2021,100(19)
Estimating stature based on body/limb parts can help define the characteristics of unidentified bodies. The most studied upper limb part is the hand, although few studies have examined whether stature can be estimated using fingers plus other hand dimensions. Moreover, there is paucity in anthropometric studies that determined whether bilateral whole limb parts (e.g., arms, forearms, and hands) are related to stature among the living subjects.This prospective cross-sectional study aimed to evaluate the relationship between different upper limb measurements and the stature of Saudi men. Furthermore, I assessed whether upper limb asymmetry was present, and developed regression models to estimate stature based on different available measurements. Stature and 13 upper limb parameters were measured for 100 right-handed Saudi men who were 18 to 24 years old.All measurements were positively correlated with stature (P < .001), and the best single predictor was the bilateral ulnar length. Asymmetry was more pronounced in the hand measurements. A multiparameter model provided reasonable predictive accuracy (±3.77–5.68 cm) and was more accurate than single-parameter models. Inclusion of the right-side fingers improved the model''s accuracy.This study developed potential models for estimating stature during the identification of bodies of Saudi men. 相似文献
9.
10.