全文获取类型
收费全文 | 4661篇 |
免费 | 191篇 |
国内免费 | 28篇 |
专业分类
耳鼻咽喉 | 80篇 |
儿科学 | 116篇 |
妇产科学 | 177篇 |
基础医学 | 464篇 |
口腔科学 | 54篇 |
临床医学 | 349篇 |
内科学 | 1269篇 |
皮肤病学 | 82篇 |
神经病学 | 659篇 |
特种医学 | 140篇 |
外科学 | 636篇 |
综合类 | 7篇 |
一般理论 | 2篇 |
预防医学 | 144篇 |
眼科学 | 143篇 |
药学 | 223篇 |
中国医学 | 22篇 |
肿瘤学 | 313篇 |
出版年
2023年 | 46篇 |
2022年 | 90篇 |
2021年 | 145篇 |
2020年 | 94篇 |
2019年 | 104篇 |
2018年 | 140篇 |
2017年 | 92篇 |
2016年 | 118篇 |
2015年 | 116篇 |
2014年 | 188篇 |
2013年 | 228篇 |
2012年 | 360篇 |
2011年 | 338篇 |
2010年 | 209篇 |
2009年 | 199篇 |
2008年 | 317篇 |
2007年 | 281篇 |
2006年 | 259篇 |
2005年 | 274篇 |
2004年 | 225篇 |
2003年 | 213篇 |
2002年 | 189篇 |
2001年 | 59篇 |
2000年 | 56篇 |
1999年 | 50篇 |
1998年 | 39篇 |
1997年 | 27篇 |
1996年 | 29篇 |
1995年 | 37篇 |
1994年 | 26篇 |
1993年 | 13篇 |
1992年 | 34篇 |
1991年 | 36篇 |
1990年 | 23篇 |
1989年 | 27篇 |
1988年 | 23篇 |
1987年 | 13篇 |
1986年 | 12篇 |
1985年 | 15篇 |
1984年 | 22篇 |
1983年 | 14篇 |
1982年 | 8篇 |
1981年 | 9篇 |
1980年 | 13篇 |
1979年 | 10篇 |
1978年 | 7篇 |
1977年 | 6篇 |
1975年 | 4篇 |
1974年 | 7篇 |
1965年 | 3篇 |
排序方式: 共有4880条查询结果,搜索用时 15 毫秒
131.
132.
133.
Loiudice Pasquale Sartini Francesco Figus Michele Nardi Marco Posarelli Chiara Casini Giamberto 《Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie》2021,259(4):949-956
Graefe's Archive for Clinical and Experimental Ophthalmology - To estimate the frequency of epiretinal membrane (ERM) in eyes with primary open-angle glaucoma (POAG) treated with Ex-Press shunt... 相似文献
134.
135.
Nicolas Ghczy Kai Sasaki Makoto Yoshimoto Sajad Pour-Esmaeil Martin Krger Pasquale Stano Peter Walde 《RSC advances》2020,10(32):18655
Enzyme-catalysed cascade reactions in flow-through systems with immobilised enzymes currently are of great interest for exploring their potential for biosynthetic and bioanalytical applications. Basic studies in this field often aim at understanding the stability of the immobilised enzymes and their catalytic performance, for example, in terms of yield of a desired reaction product, analyte detection limit, enzyme stability or reaction reproducibility. In the work presented, a cascade reaction involving the two enzymes bovine carbonic anhydrase (BCA) and horseradish peroxidase (HRP) – with hydrogen peroxide (H2O2) as HRP “activator” – was first investigated in great detail in bulk solution at pH = 7.2. The reaction studied is the hydrolysis and oxidation of 2′,7′-dichlorodihydrofluorescein diacetate (DCFH2-DA) to 2′,7′-dichlorofluorescein (DCF), which was found to proceed along two reaction pathways. This two-enzyme cascade reaction was then applied for analysing the performance of BCA and HRP immobilised in glass fiber filters which were placed inside a filter holder device through which a DCFH2-DA/H2O2 substrate solution was pumped. Comparison was made between (i) co-immobilised and (ii) sequentially immobilised enzymes (BCA first, HRP second). Significant differences for the two arrangements in terms of measured product yield (DCF) could be explained based on quantitative UV/vis absorption measurements carried out in bulk solution. We found that the lower DCF yield observed for sequentially immobilised enzymes originates from a change in one of the two possible reaction pathways due to enzyme separation, which was not the case for enzymes that were co-immobilised (or simultaneously present in the bulk solution experiments). The higher DCF yield observed for co-immobilised enzymes did not originate from a molecular proximity effect (no increased oxidation compared to sequential immobilisation).A cascade reaction catalysed by bovine carbonic anhydrase (BCA) and horseradish peroxidase (HRP) proceeds over two possible pathways, which explains differences in product formation for differently immobilised enzymes in flow-through reactions. 相似文献
136.
Michele Buemi Davide Bolignano Giuseppe Coppolino Giuseppe Di Pasquale Vincenzo Cosentini Susanna Campo 《Renal failure》2013,35(5):567-572
The aquaporin-2 (AQP2) plays a key role in AVP-induced absorption of water, and its urinary excretion is related to its function. We aimed to test if the assumption of water with different mineral content can modify the expression of AQP2, leading to a change in AQP2 urinary concentration, in 20 healthy young subjects. Each subject received an oral water load (LM or HM) of 250 mL/hour for four hours, and several variables were measured. Plasmatic osmolality after water assumption was significantly reduced with no differences after the low (LM) or the high mineral (HM) water load. Urinary osmolality and plasmatic vasopressin concentration were significantly reduced after an assumption of both kinds of water. However, serum vasopressin was lower after HM water assumption than after LM. AQP2 urinary excretion was significantly reduced after water assumption with respect to the basal level and it was lower after LM than after HM water assumption. The different mineral content of water was investigated as a factor contributing to the development of hypertension. Considering that AQP2 can play a role in pathogenesis of hypertension, our demonstration that AVP-mediated AQP2 urinary excretion is strictly influenced by the consumption of water with different mineral content suggests a new, interesting field of investigation related to the link between blood pressure alterations and nutritional habits. 相似文献
137.
138.
Roberto Michelucci Elena Pasini Sandro Malacrida Pasquale Striano Carlo Di Bonaventura Patrizia Pulitano Francesca Bisulli Gabriella Egeo Lia Santulli Vito Sofia Antonio Gambardella Maurizio Elia Arturo de Falco Angela la Neve Paola Banfi Giangennaro Coppola Patrizia Avoni Simona Binelli Clementina Boniver Tiziana Pisano Marco Marchini Emanuela Dazzo Manuela Fanciulli Yerma Bartolini Patrizia Riguzzi Lilia Volpi Fabrizio A. de Falco Anna Teresa Giallonardo Oriano Mecarelli Salvatore Striano Paolo Tinuper Carlo Nobile 《Epilepsia》2013,54(7):1288-1297
139.
Felicitas Becker Julian Schubert Pasquale Striano Anna-Kaisa Anttonen Elina Liukkonen Eija Gaily Christian Gerloff Stephan Müller Nicole Heußinger Christoph Kellinghaus Angela Robbiano Anne Polvi Simone Zittel Tim J. von Oertzen Kevin Rostasy Ludger Schöls Tom Warner Alexander Münchau Anna-Elina Lehesjoki Federico Zara Holger Lerche Yvonne G. Weber 《Journal of neurology》2013,260(5):1234-1244
Recent studies reported mutations in the gene encoding the proline-rich transmembrane protein 2 (PRRT2) to be causative for paroxysmal kinesigenic dyskinesia (PKD), PKD combined with infantile seizures (ICCA), and benign familial infantile seizures (BFIS). PRRT2 is a presynaptic protein which seems to play an important role in exocytosis and neurotransmitter release. PKD is the most common form of paroxysmal movement disorder characterized by recurrent brief involuntary hyperkinesias triggered by sudden movements. Here, we sequenced PRRT2 in 14 sporadic and 8 familial PKD and ICCA cases of Caucasian origin and identified three novel mutations (c.919C>T/p.Gln307*, c.388delG/p.Ala130Profs*46, c.884G>A/p.Arg295Gln) predicting two truncated proteins and one probably damaging point mutation. A review of all published cases is also included. PRRT2 mutations occur more frequently in familial forms of PRRT2-related syndromes (80–100 %) than in sporadic cases (33-46 %) suggesting further heterogeneity in the latter. PRRT2 mutations were rarely described in other forms of paroxysmal dyskinesias deviating from classical PKD, as we report here in one ICCA family without kinesigenic triggers. Mutations are exclusively found in two exons of the PRRT2 gene at a high rate across all syndromes and with one major mutation (c.649dupC) in a mutational hotspot of nine cytosines, which is responsible for 57 % of all cases in all phenotypes. We therefore propose that genetic analysis rapidly performed in early stages of the disease is highly cost-effective and can help to avoid further unnecessary diagnostic and therapeutic interventions. 相似文献
140.
Pasquale Parisi Pasquale Striano Alberto Verrotti Maria Pia Villa Vincenzo Belcastro 《Seizure》2013,22(4):253-258
PurposeThe case report published in this issue by Wang et al. offers us an opportunity to review previously published “ictal epileptic headache” cases and draw attention to the criteria that have recently been published for this condition, taking into consideration not only the clinical-EEG and physiopathogenetic investigations required to diagnose this condition, but also the therapeutic aspects of the issue.MethodsTo this aim we reviewed all well-documented cases that have been reported in the literature.ResultsThe relationship between headache and seizures is somewhat complicated. Although the nature of this association is not yet fully clear, several plausible explanations have been proposed. Further experimental and clinical investigations are, however, warranted to gain a better understanding of this relationship. Epilepsy and idiopathic headache/migraine share several pathophysiological mechanisms; a better understanding of these mechanisms will allow us to more accurately to assess the “real burden” and prevalence of the “ictal epileptic headache” phenomenon and its therapeutic implications.ConclusionsThe development of animal models and molecular studies and, above all, multicenter clinical studies conducted according to the proposed IEH criteria represent the starting point for a definitive international consensus on this intriguing topic. In addition, to improve the recognition of ictal epileptic headache, we should encourage the use of EEG recording in the emergency setting. 相似文献