全文获取类型
收费全文 | 2074篇 |
免费 | 96篇 |
国内免费 | 14篇 |
专业分类
耳鼻咽喉 | 33篇 |
儿科学 | 77篇 |
妇产科学 | 79篇 |
基础医学 | 377篇 |
口腔科学 | 18篇 |
临床医学 | 107篇 |
内科学 | 463篇 |
皮肤病学 | 95篇 |
神经病学 | 238篇 |
特种医学 | 23篇 |
外科学 | 113篇 |
综合类 | 21篇 |
预防医学 | 165篇 |
眼科学 | 107篇 |
药学 | 171篇 |
中国医学 | 2篇 |
肿瘤学 | 95篇 |
出版年
2023年 | 6篇 |
2022年 | 55篇 |
2021年 | 98篇 |
2020年 | 36篇 |
2019年 | 46篇 |
2018年 | 64篇 |
2017年 | 47篇 |
2016年 | 46篇 |
2015年 | 61篇 |
2014年 | 69篇 |
2013年 | 89篇 |
2012年 | 143篇 |
2011年 | 167篇 |
2010年 | 77篇 |
2009年 | 42篇 |
2008年 | 126篇 |
2007年 | 140篇 |
2006年 | 160篇 |
2005年 | 139篇 |
2004年 | 148篇 |
2003年 | 103篇 |
2002年 | 99篇 |
2001年 | 12篇 |
2000年 | 16篇 |
1999年 | 9篇 |
1998年 | 10篇 |
1997年 | 9篇 |
1996年 | 8篇 |
1995年 | 5篇 |
1994年 | 5篇 |
1993年 | 4篇 |
1992年 | 5篇 |
1991年 | 13篇 |
1990年 | 10篇 |
1989年 | 6篇 |
1988年 | 11篇 |
1987年 | 16篇 |
1986年 | 6篇 |
1985年 | 11篇 |
1983年 | 10篇 |
1982年 | 7篇 |
1981年 | 2篇 |
1980年 | 4篇 |
1979年 | 14篇 |
1978年 | 14篇 |
1975年 | 5篇 |
1968年 | 2篇 |
1967年 | 2篇 |
1965年 | 2篇 |
1962年 | 2篇 |
排序方式: 共有2184条查询结果,搜索用时 15 毫秒
41.
Giebel S Locatelli F Wojnar J Velardi A Mina T Giorgiani G Krawczyk-Kulis M Markiewicz M Wylezol I Holowiecki J 《British journal of haematology》2005,131(4):483-486
Human leucocyte antigen (HLA)-C molecules regulate the function of natural killer cells and may be subdivided into two groups, C(1) and C(2), based on their specificity for inhibitory killer immunoglobulin-like receptors. We analysed the impact of the HLA-C genotype on outcome of HLA-C-matched unrelated donor haematopoietic stem cell transplantation (URD-HSCT) recipients. HLA-C(2) homozygous patients (n = 18) had lower probability of overall survival (P = 0.01) and disease-free survival (P = 0.02), resulting from increased relapse rate (P = 0.02) when compared with both HLA-C(1) homozygous (n = 43) and HLA-C(1),C(2) heterozygous (n = 50) subgroups. Patients lacking HLA-C(1) should, therefore, be considered at increased risk of relapse following HLA-C-matched URD-HSCT. 相似文献
42.
Jose Luis Alonso Pablo Martínez Montserrat Vallverdú Iwona Cygankiewicz Maria Vittoria Pitzalis Antoni Bays Genís Juan Cinca Paolo Rizzon Pere Caminal Wojciech Zareba Antoni Bays De Luna 《Annals of noninvasive electrocardiology》2005,10(2):121-128
Background: Patients with impaired left ventricular function have a high risk of developing ventricular arrhythmias and sudden death. Among different markers of risk, the prolongation and regional heterogeneity of repolarization are of increasing interest. However, there are limited data regarding feasibility of analyzing repolarization parameters and their dynamics in 24‐hour Holter ECG recordings. Methods: Dynamic behavior of repolarization parameters was studied with a new automatic algorithm in digital 24‐hour Holter recordings of 60 healthy subjects and 55 patients with idiopathic dilated cardiomyopathy (IDC). Repolarization parameters included the mean value of QT and QTc durations, QT dispersion, and peaks of QT duration and QT dispersion above prespecified thresholds. Results: In comparison to healthy subjects, patients with IDC had lower heart rate variability, longer mean QT and QTc durations, higher content of QTc peaks >500 ms, longer QT dispersion and its standard deviation, and a higher content of peaks >100 ms of QT dispersion (P < 0.01 for all comparisons). These repolarization parameters were significantly higher in IDC patients after adjustment for age, sex, and heart rate variability. The parameters of repolarization dynamics correlated with SDNN in healthy subjects but not in dilated cardiomyopathy patients. Conclusions: The automatic assessment of repolarization parameters in 24‐hour digital ECG recordings is feasible and differentiates dilated cardiomyopathy patients from healthy subjects. Patients with dilated cardiomyopathy have increased QT duration, QT dispersion, and increased variability of QT dispersion reflecting variations in T‐wave morphology, the factors which might predispose them to the development of arrhythmic events. 相似文献
43.
A female patient suffering from dermatomyositis in whom symptoms of heart failure without angina is described. An impairment of left ventricular function and significant coronary lesions were diagnosed using noninvasive and invasive procedures. Coronary angioplasty with stent implantation was successfully applied to improve the quality of life and clinical symptoms. 相似文献
44.
Kozłowska I Krzystolik A Rózański J Nikodemska I Kurowski M Ciechanowski K 《Kardiologia polska》2005,62(2):151-152
A case of a 49-year-old female with a history of two myocardial infarctions (MI) and ischaemic stroke is presented. The patient was admitted to the hospital due to a third acute MI. Laboratory investigations revealed resistance to activated protein C due to factor V Leiden mutation. Diagnosis and treatment of patients with this condition are discussed. 相似文献
45.
The coincidence of viral hepatitis and acute pancreatitis is well described. Most of the cases are related to acute hepatitis A or B. Hepatitis E virus (HEV) infections are rare in Europe, and very few reports describe HEV as a causative agent of acute pancreatitis in areas of endemic hepatitis E prevalence. We report a case of acute pancreatitis in the course of acute hepatitis E in a 28-year-old male patient. The majority of reported cases, including our case, show several common epidemiological and clinical features: young age, male predominance, onset of acute pancreatitis at the early stage of acute hepatitis, and favorable outcome. Acute pancreatitis should be considered in acute hepatitis E, especially in young, male patients presenting with severe epigastric pain early in the course of disease. The pancreatitis in these patients usually runs a benign course. The patients should be closely monitored because life-threatening complications have been reported. 相似文献
46.
The relevance of tyrosine kinase inhibitors (TKIs) in the treatment of malignancies has
been already defined. Aberrant activation of tyrosine kinase signaling pathways has been causally
linked not only to cancers but also to other non-oncological diseases. This review concentrates on the
novel plausible usage of this group of drugs in neurological disorders, such as ischemic brain stroke,
subarachnoid hemorrhage, Alzheimer’s disease, multiple sclerosis. The drugs considered here are
representatives of both receptor and non-receptor TKIs. Among them imatinib and masitinib have the
broadest spectrum of therapeutic usage. Both drugs are effective in ischemic brain stroke and multiple
sclerosis, but only imatinib produces a therapeutic effect in subarachnoid hemorrhage. Masitinib and
dasatinib reduce the symptoms of Alzheimer’s disease. In the case of multiple sclerosis several TKIs are useful, including
apart from imatinib and masitinib, also sunitinib, sorafenib, lestaurtinib. Furthermore, the possible molecular targets for
the drugs are described in connection with the underlying pathophysiological mechanisms in the diseases in question. The
most frequent target for the TKIs is PDGFR which plays a pivotal role particularly in ischemic brain stroke and
subarachnoid hemorrhage. The collected data indicates that TKIs are very promising candidates for new therapeutic
interventions in neurological diseases. 相似文献
47.
48.
Deliberately controlled interfacial interactions between incorporated nanofiller particles and host polymer backbone chains constitute a critical element in the realm of polymer nanocomposites with tailorable multifunctional properties. We demonstrate the physicochemical effects induced by graphene nanoplatelets (GNP) of different sizes on the condensation polymerization reaction of aromatic thermosetting copolyester (ATSP) through the formation of electrically conductive percolating networks as enabled by interfacial interactions. Carboxylic acid and acetoxy-capped precursor oligomers of ATSP are solid-state mixed with chemically pristine GNP particles at various loading levels. Upon in situ endothermic condensation polymerization reaction, crosslinked backbone of the ATSP foam matrix is formed while the carbonaceous nanofillers are incorporated into the polymer network via covalent conjugation with functional end-groups of the oligomers. The controlled GNP size promotes different electrical percolation thresholds and ultimate electrical conductivities. Microstructural analysis demonstrates GNP distributions in the matrix as well as morphological modifications induced by the formation of conductive percolating GNP networks. Cure characteristics reveal the thermochemical changes prompted in the polymerization processes for GNP content above the requirement for percolation formation. Chemical spectroscopy of the ATSP nanocomposite morphology exhibits the formation of a robust interfacial coupling mechanism between the GNPs and ATSP backbone. The findings here may guide the developmental efforts of nanocomposites through better identifying roles of the morphology and content of nanofillers in polymerization processes.Physicochemical effects induced by graphene nanoplatelets on the in situ polycondensation reaction of aromatic thermosetting copolyester through the formation of conductive percolating network assembled via interfacial interactions. 相似文献
49.
FDG‐based quantitative comparison of glucose metabolism in vitro,exemplified by a head‐to‐head comparison between a triple‐negative breast cancer cell line and a non‐malignant foetal cell line 下载免费PDF全文
50.
Falkowski A Kaczmarczyk M Goracy I Górecka-Szyld B Poncyljusz W Parczewski M Ciechanowicz A 《Polskie Archiwum Medycyny Wewn?trznej》2005,114(1):644-651
Thrombophilia, the state of increased tendency for blood clotting, is considered the disorder of a complex etiology, caused by both environmental and genetic factors. As gene variants predisposing to thrombophilia and influencing the increased risk of vein thrombosis might influence response to local thrombolysis, the aim of the work was to characterize the pharmacogenetic conditions for local streptokinase treatment in patients with a deep vein thrombosis (DVT) of lower extremities based on the following polymorphism analyses: G1691A polymorphism of factor V (FV), G20210A polymorphism of prothrombin (PT), A4250G (Thr312Ala) polymorphism of fibrinogen-alpha (FGA), G(-455)A polymorphism of fibrinogen-beta (FGB), 4G/5G polymorphism of plasminogen activator inhibitor type 1(PAI-1) and insertion/deletion (I/D) polymorphism of tissue plasminogen activator (t-PA). The study included 40 DVT patients who underwent a local thrombolytic treatment within 14-day period from diagnosis. Full recanalization was achieved in 20 subjects (50%) [group R(+)], whereas incomplete or total lack of recanalization was identified in the remaining 20 patients [group R(-)]. No major complications of thrombolytic treatment occurred in the studied group. In the case of prothrombin gene all individuals carried homozygous wild type genotype (GG). Prevalence of the genotypes and alleles of the remaining five polymorphisms did not differ significantly between the groups R(+) and R(-). Neither sex nor age, smoking or time period from diagnosis to introduction of the thrombolytic treatment significantly influenced treatment efficacy. The results of the study suggest that a local thrombolysis with streptokinase introduced within two week period from the diagnosis is a safe and efficient method of treatment for deep vein thrombosis of lower extremities. However, size of the group is insufficient to clearly determine the association between investigated polymorphisms and efficacy of local treatment with streptokinase. 相似文献