全文获取类型
收费全文 | 4658篇 |
免费 | 338篇 |
国内免费 | 20篇 |
专业分类
耳鼻咽喉 | 19篇 |
儿科学 | 149篇 |
妇产科学 | 109篇 |
基础医学 | 713篇 |
口腔科学 | 128篇 |
临床医学 | 361篇 |
内科学 | 1121篇 |
皮肤病学 | 216篇 |
神经病学 | 534篇 |
特种医学 | 44篇 |
外科学 | 324篇 |
综合类 | 21篇 |
预防医学 | 399篇 |
眼科学 | 145篇 |
药学 | 372篇 |
中国医学 | 33篇 |
肿瘤学 | 328篇 |
出版年
2023年 | 35篇 |
2022年 | 67篇 |
2021年 | 170篇 |
2020年 | 101篇 |
2019年 | 163篇 |
2018年 | 178篇 |
2017年 | 127篇 |
2016年 | 147篇 |
2015年 | 156篇 |
2014年 | 216篇 |
2013年 | 253篇 |
2012年 | 439篇 |
2011年 | 422篇 |
2010年 | 239篇 |
2009年 | 189篇 |
2008年 | 341篇 |
2007年 | 288篇 |
2006年 | 271篇 |
2005年 | 285篇 |
2004年 | 255篇 |
2003年 | 222篇 |
2002年 | 230篇 |
2001年 | 12篇 |
2000年 | 9篇 |
1999年 | 30篇 |
1998年 | 29篇 |
1997年 | 24篇 |
1996年 | 21篇 |
1995年 | 13篇 |
1994年 | 8篇 |
1993年 | 12篇 |
1992年 | 9篇 |
1991年 | 7篇 |
1990年 | 4篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1987年 | 6篇 |
1986年 | 6篇 |
1983年 | 2篇 |
1982年 | 5篇 |
1981年 | 4篇 |
1980年 | 2篇 |
1978年 | 3篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1974年 | 2篇 |
1973年 | 1篇 |
1971年 | 1篇 |
1970年 | 1篇 |
1967年 | 1篇 |
排序方式: 共有5016条查询结果,搜索用时 15 毫秒
171.
172.
Martin A. Santini Cecilia Ratner Susana Aznar Anders B. Klein Gitte M. Knudsen Jens D. Mikkelsen 《Journal of neuroscience research》2013,91(5):634-641
Prefrontal serotonin 2A receptors (5‐HT2ARs) have been linked to the pathogenesis and treatment of schizophrenia. Many antipsychotics fully occupy 5‐HT2AR at clinical relevant doses, and activation of 5‐HT2A receptors by lysergic acid diethylamide (LSD) and LSD‐like drugs induces a schizophrenia‐like psychosis in humans. Subchronic phencyclidine (PCP) administration is a well‐established model for schizophrenia‐like symptoms in rodents. The aim of the present study was to investigate whether subchronic PCP administration changes expression, binding, or functionality of cortical 5‐HT2ARs. As a measure of 5‐HT2AR functionality, we used the 5‐HT2AR agonist 2,5‐dimethoxy‐4‐iodoamphetamine (DOI)‐induced head‐twitch response (HTR) and mRNA expression of the immediate‐early genes (IEGs) activity‐related cytoskeletal associated‐protein (Arc), c‐fos, and early growth response protein 2 (egr‐2) in the frontal cortex. Mice were treated with PCP (10 mg/kg) or saline for 10 days, followed by a 5‐day washout period. The PCP pretreatment increased the overall induction of HTR and frontal cortex IEG mRNA expression following a single challenge with DOI. These functional changes were not associated with changes in 5‐HT2AR binding. Also, binding of the 5‐HT1AR and the 5‐HT transporter was unaffected. Finally, basal mRNA level of Arc was increased in the prefrontal cortex after subchronic PCP administration as revealed with in situ hybridization. Together these findings indicate that PCP administration produces changes in the brain that result in an increase in the absolute effect of DOI. Therefore, neurotransmission involving the 5‐HT2AR could contribute to the behavioral deficits observed after PCP treatment. © 2013 Wiley Periodicals, Inc. 相似文献
173.
Isabel Krug Carolina Casasnovas Roser Granero Cristina Martinez Susana Jiménez-Murcia Cynthia Bulik 《Psychotherapy research》2013,23(1):37-47
Abstract This study compared symptomatological and personality differences between individuals with threshold bulimia nervosa (BN; n=39) and those with subthreshold BN (n=39) and their short-term response to a brief outpatient intervention. Participants were matched using a pairwise matching procedure, taking into account age, age of onset, and duration of the disorder. Both groups received the same brief outpatient psychoeducational therapy. The same assessment measures were used before and after treatment. With the exception of some clinical and psychopathological symptoms (higher depression and phobic anxiety in threshold BN), there were no significant between-group differences on scales of general psychopathology or personality traits. At the end of treatment, there were no significant between-group differences on abstinence rates for binge eating and vomiting, number of sessions attended, or dropout rates. Threshold BN and subthreshold BN share common psychopathological symptoms and personality traits. No differences in therapy outcome were observed for the two groups after a brief group psychoeducational intervention. 相似文献
174.
Beatriz Rodriguez Vega Javier Melero-Llorente Carmen Bayon Perez Susana Cebolla Jorge Mira Carla Valverde 《Psychotherapy research》2013,23(2):202-213
AbstractObjectives: Little empirical literature focuses on psychotherapists' cultivation of internal states of mind necessary for controlling attention and responding empathically to the client. We explore the effects of mindfulness training on emotional and attentional measures in Spanish resident intern psychiatrists and clinical psychologists. Method: One hundred and three residents were assigned to an experimental group (n = 60) that completed an 8-week mindfulness training versus a wait-list control group (n = 43). We evaluated emotional variables (sadness, anxiety, and anger, using standard instruments), state of mindfulness (using the Mindfulness Awareness Attention Scale), and attentional control variables using objective measures such as a continuous performance task and the Stroop task before and after mindfulness training. Results: Our study provides data that suggest that mindfulness training significantly improves measures of trait anger and attentional control. Conclusions: Further research is needed to replicate these findings, explore the effects of mindfulness training on other aspects of emotional regulation and cognition, and evaluate the impact of these effects within clinical situations. 相似文献
175.
Sánchez GA Di Croce DE Richard SB Takara D 《Acta odontológica latinoamericana : AOL》2012,25(1):34-39
Local anesthetics used in dentistry have myotoxic effects. Articaine, also known as carticaine, is one of the local anesthetics most widely used in clinical dentistry. The aim of this work was to describe its effect on the sarcoplasmic reticulum Ca-ATPase isolated from medial pterygoid muscle. Ca-ATPase enzymatic activity was determined by a colorimetric method and ATP-dependent calcium uptake with a radioisotopic technique. Articaine inhibited both Ca-ATPase activity and calcium uptake in a concentration-dependent manner. Both inhibitory effects became evident at articaine concentrations lower than those employed in clinical dentistry. Half-maximal inhibitory concentrations (K) were 15.1 +/- 1.8 mM (n = 6) and 25.2 +/- 1.6 mM (n = 6) for enzymatic activity and calcium uptake, respectively. Preincubation of sarcoplasmic reticulum membranes with articaine enhanced Ca-ATPase activity in the absence of calcium ionophore, suggesting an ionophoric-like effect of the local anesthetic. We conclude that the inhibitory effect of articaine on the sarcoplasmic reticulum Ca-ATPase isolated from medial pterygoid muscle is due to a direct interaction of the anesthetic with the enzyme and to the increased membrane permeability to calcium induced by this drug. 相似文献
176.
Viviana Cuartas Sara M. Robledo Iván D. Vélez María del Pilar Crespo Maximiliano Sortino Susana Zacchino Manuel Nogueras Justo Cobo Yulieth Upegui Tatiana Pineda Lina Yepes Braulio Insuasty 《Archiv der Pharmazie》2020,353(5):e1900351
A new series of N-substituted pyrazoline derivatives 6a–g , 7a–g , 8a–g , and 9a–g was synthetized by reaction of hydrazine derivatives and chalcone–thiazole hybrids bearing nitrogen mustard 5a–g . The chalcones 5a–g were obtained by Claisen–Schmidt condensation of thiazole-2-nitrogen mustard 3 and selected acetophenones 4a–g . These new compounds 6/7/8/9a–g were screened for their antifungal activity against Cryptococcus neoformans, with IC50 values of 3.9–7.8 µg/ml for the N-3,5-dichlorophenyl pyrazolines 9e – g . Interestingly, those compounds show low cytotoxic effects toward erythrocytes (RBC). In addition, N-acetyl ( 6a,b ) and N-formyl pyrazolines ( 7a , 7b , 7c , and 7g ) showed inhibitory activity against methicillin-susceptible Staphylococcus aureus, methicillin-resistant S. aureus, and vancomycin-intermediate S. aureus, with the most important minimum inhibitory concentration values ranging from 31.25 to 125 µg/ml. Regarding the antiprotozoal activity, thiazolyl-pyrazolines 9g , 8f , and 7c display high activity against Plasmodium falciparum, Leishmania (V) panamensis, and Trypanosoma cruzi, with EC50 values of 11.80, 6.46, and 4.98 μM, respectively, and with 7c being approximately 2.6-fold more potent than benznidazole with a selectivity index of 1.61 on U-937 human cells, showing promising potential as a novel antitrypanosomal agent. 相似文献
177.
Susana Cristina Araújo Pvoas Peter Krustrup Rita Pereira Silvia Vieira Ivone Carneiro Jos Magalhes Carlo Castagna 《Scandinavian journal of medicine & science in sports》2019,29(10):1537-1545
This study aimed at examining the suitability of a standard treadmill test (TT), popular intermittent field tests, and small‐sided football matches to induce maximal heart rate (HRmax) in recreational football players. Sixty‐six inactive untrained male subjects (age: 39.3 ± 5.8 years, VO2max: 41.2 ± 6.2 mL kg?1 min?1, body mass: 81.9 ± 10.8 kg, height: 173.2 ± 6.4 cm) were evaluated. On separate occasions, the players were randomly submitted to a progressive VO2max TT, to the Yo‐Yo intermittent endurance level 1 (YYIE1) and level 2 (YYIE2) tests, to the Yo‐Yo intermittent recovery level 1 (YYIR1) test, and to 7v7 (43 × 27 m pitch, 83 m2/player) football matches (45 minutes; 2‐4 matches/player). To ensure data consistency, exercise HR was recorded using the same HR monitors in all the experimental conditions. A total of 73%, 24%, 18%, 17%, and 30% of the players achieved their HRmax during the YYIE1, YYIE2, YYIR1, TT, and the small‐sided football matches, respectively. The probability of achieving HRmax increased proportionally to test duration, with 7.8 minutes as the cutoff time. Variations in HRpeak of ±2 b min?1 should be regarded as of practical relevance. YYIE1 HRpeak provided the most accurate estimation of a subject's individual HRmax and much higher probability of reaching HRmax. Nevertheless, the results of this study suggest caution in considering a reference test for HRmax assessment in this population. The use of confirmation tests is still highly advisable when the test duration is shorter than 7.8 minutes. In this regard, field tests seem to be suitable and accurate for individual HRmax assessment in recreational football players. 相似文献
178.
Rodríguez-Castro Emilio Arias-Rivas Susana Santamaría-Cadavid María López-Dequidt Iria Rodríguez-Yáñez Manuel Mosqueira Antonio Jesús Blanco Ulla Miguel Vázquez Herrero Fernando Castiñeira José Antonio Martínez-Sáez Elena Pérez Béliz Edurne Mosquera Nilo Caicedo Diego Fraga Máximo Pumar José Manuel 《Journal of neurology》2022,269(10):5629-5637
Journal of Neurology - Determining the cause of acute ischemic stroke is crucial for patient management, particularly for preventing future stroke. In recent years, carotid web (CW), a... 相似文献
179.
180.
miR‐155 expression and correlation with clinical outcome in pediatric AML: A report from Children's Oncology Group
下载免费PDF全文
![点击此处可从《Pediatric blood & cancer》网站下载免费的PDF全文](/ch/ext_images/free.gif)