全文获取类型
收费全文 | 2819篇 |
免费 | 217篇 |
国内免费 | 11篇 |
专业分类
耳鼻咽喉 | 21篇 |
儿科学 | 104篇 |
妇产科学 | 112篇 |
基础医学 | 424篇 |
口腔科学 | 89篇 |
临床医学 | 346篇 |
内科学 | 551篇 |
皮肤病学 | 117篇 |
神经病学 | 225篇 |
特种医学 | 42篇 |
外科学 | 196篇 |
综合类 | 52篇 |
一般理论 | 4篇 |
预防医学 | 225篇 |
眼科学 | 71篇 |
药学 | 230篇 |
中国医学 | 50篇 |
肿瘤学 | 188篇 |
出版年
2024年 | 7篇 |
2023年 | 49篇 |
2022年 | 165篇 |
2021年 | 223篇 |
2020年 | 164篇 |
2019年 | 189篇 |
2018年 | 188篇 |
2017年 | 107篇 |
2016年 | 140篇 |
2015年 | 116篇 |
2014年 | 157篇 |
2013年 | 188篇 |
2012年 | 249篇 |
2011年 | 236篇 |
2010年 | 118篇 |
2009年 | 83篇 |
2008年 | 116篇 |
2007年 | 106篇 |
2006年 | 89篇 |
2005年 | 93篇 |
2004年 | 61篇 |
2003年 | 32篇 |
2002年 | 33篇 |
2001年 | 4篇 |
1999年 | 6篇 |
1998年 | 3篇 |
1997年 | 4篇 |
1996年 | 2篇 |
1995年 | 4篇 |
1994年 | 3篇 |
1993年 | 5篇 |
1992年 | 5篇 |
1991年 | 4篇 |
1990年 | 5篇 |
1989年 | 5篇 |
1988年 | 8篇 |
1987年 | 13篇 |
1986年 | 6篇 |
1985年 | 12篇 |
1984年 | 6篇 |
1983年 | 3篇 |
1982年 | 2篇 |
1980年 | 4篇 |
1979年 | 8篇 |
1977年 | 3篇 |
1976年 | 4篇 |
1973年 | 3篇 |
1972年 | 2篇 |
1970年 | 3篇 |
1936年 | 1篇 |
排序方式: 共有3047条查询结果,搜索用时 15 毫秒
141.
Jamali-Raeufy Nida Mojarrab Zahra Baluchnejadmojarad Tourandokht Roghani Mehrdad Fahanik-Babaei Javad Goudarzi Mina 《Metabolic brain disease》2020,35(3):539-548
Metabolic Brain Disease - Loss of dopaminergic neurons following Parkinson’s disease (PD) diminishes quality of life in patients. The present study was carried out to investigate the... 相似文献
142.
Alp Özgün Börcek Hakan Emmez Koray M. Akkan Özgür Öcal Gökhan Kurt Şükrü Aykol Eray Karahacioğli Kemali M. Baykaner 《Child's nervous system》2014,30(9):1485-1492
Objective
The authors present the results of Gamma Knife stereotactic radiosurgery performed in a series of children with arteriovenous malformations (AVMs).Methods
Between June 2005 and January 2014, 75 patients 18 years old or younger received Gamma Knife radiosurgery for AVMs. Of these, 58 patients were eligible for further analysis. The median age of the population was 12 years; 41 % presented with hemorrhage, 34 % with neurological insult, and 24 % patients were diagnosed incidentally. The median AVM volume was 3.5 cm3. The median radiosurgery-based AVM score (RSBAVMS) was 0.86. The median follow-up period was 32 months.Results
Single session Gamma Knife radiosurgery resulted in complete AVM obliteration in 40 (68.9 %) patients. There were 35 (60.3 %) excellent outcome (complete obliteration with no new deficits) in this series. During the follow-up period, nine (15.51 %) patients experienced new deficits and three (5.1 %) patients experienced intracranial hemorrhage. The annual rate of developing new deficits and hemorrhage was calculated as 5.45 and 1.8 %, respectively. Volume, gender, RSBAVMS, and nidus type factor were factors associated with excellent outcome.Conclusions
Radiosurgery was successful in majority of patients with minimal morbidity. Gamma Knife radiosurgery for AVMs can be a safe and successful method in pediatric patients. 相似文献143.
144.
Mostafa Ahmadi Mahbobeh Faramarzi Zahra Basirat Farzan Kheirkhah Mohammad Chehrazi Fatemeh Ashabi 《African health sciences》2020,20(3):1241
BackgroundPolycystic Ovarian Syndrome (PCOS) is one of the most common causes of infertility in women.ObjectiveThe current study investigated mental and personality disorders in infertile women with and without PCOS.MethodsThis case-control study evaluated 400 infertile women who referred to the Infertility Center in Babol city (North of Iran). Participants were categorized into the case group (201 PCOS) and the control group (199 without PCOS). All of the participants completed the Millon Clinical Multi-axial Inventory-III (MCMI-III).ResultsThe mean scores for clinical personality patterns were significantly higher for six personality disorders (schizoid, avoidant, antisocial, depressive, sadistic, and negativistic) and for three classes of severe personality disorder patterns (schizotypal, borderline, and paranoid) in infertile women with PCOS than in women without PCOS. The mean scores for eight clinical disorders (somatoform, manic disorder, dysthymia, alcohol-dependence, drug-dependence, post-trauma stress disorder, major depression, and delusion disorder) were also higher in infertile women with PCOS than in women without PCOS.ConclusionThe scores of many mental and personality disorders are higher in infertile women with PCOS than in women without PCOS. Thus, clinicians should prioritize recognizing and treating psychological problems of infertile women with PCOS. 相似文献
145.
146.
147.
Alireza Samavati Zahra Samavati Ahmad Fauzi Ismail N. Yahya M. H. D. Othman M. A. Rahman M. A. A. Bakar K. N. Koo M. F. Salebi Iraj Sadegh Amiri 《RSC advances》2019,9(61):35878
Monitoring the oil movement using a non-contact optical fiber probe during enhanced oil recovery is a novel technique to increase the efficiency of the process by distinguishing the oil position in the reservoir. A partially unclad fiber Bragg grating (FBG) coated with Fe3O4 nanoparticles as a magnetic field sensor is experimentally demonstrated. A series of six FBGs reflecting different wavelengths are fixed on the surface of sandstone. Nanofluids containing magnetite nanoparticles and alkaline-surfactant-polymer are injected continuously in two separate steps into the sandstone, which is saturated with 20% oil and 80% brine. The chamber is equipped with a solenoid that acts as a magnetic field generator. The changes in the magnetic field strength depended on the FBG-solenoid distance and the density of localized injected nanoparticles near the FBGs leads to a shift of the reflected wavelength of each single FBG accordingly. The shift is caused by the interference of different propagating modes reflected from the core-cladding and cladding-magnetite layer interfaces. The intensity of the FBG spectra decreases by injecting the nanofluid and vice versa for surfactant injection. The sensor response time of ∼21 s confirms the high reliability and repeatability of the sensing scheme. Movement of oil along the sandstone alters the wavelength shift in the FBG spectra.Monitoring the oil movement using a non-contact optical fiber probe during enhanced oil recovery is a novel technique to increase the efficiency of the process by distinguishing the oil position in the reservoir. 相似文献
148.
Zahra Masoudi Marziyeh Akbarzadeh Farideh Vaziri Najaf Zare Mani Ramzi 《Iranian journal of pediatrics.》2014,24(3):285-292
Objective: Vasoconstriction during anxiety reduces fetal oxygenation and leads to hypoxia. Hypoxia in turn results in increase of the number of nucleated red blood cells (NRBCs) in the cord blood. The present study aimed to assess the effect of decreasing maternal anxiety on fetal oxygenation and NRBCs count in the cord blood.
Methods:. In this study, 150 women were randomly divided into two intervention groups [supportive care and acupressure in BL32 (bladder) acupoint] and a control group (hospital routine care). The infants'' cord blood was investigated regarding the number of NRBCs and the intensity of hypoxia after birth. Then, the data were entered into the SPSS statistical software (v. 16) and analyzed using ANOVA, Chi-square test, and logistic regression analysis.
Findings
: The significant difference was found between the two groups regarding the number of NRBCs counted in the peripheral blood smear (P<0.001). Besides, a significant relationship was observed between the length of the first and second stages of labor and the number of NRBCs in the cord blood (P=0.01). Also, a significant association was observed between the type of delivery and the number of NRBCs in the cord blood in both intervention (P<0.001) and control groups (P=0.03).
Conclusion: Doula supportive care and acupressure at BL32 point reduced the length of labor stages as well as the anxiety level. Also, nucleated red blood cells were less in the 2 groups of intervention than in control group. Regarding the fact that nucleated red blood cells cannot be the only factor for hypoxia predicting, for affirmation of this theory study with higher sample size and survey of mothers at high risk are needed.Key Words: Acupressure; Anxiety; Delivery Outcome; Doula 相似文献
149.
Mohammad Hossein Boskabady Ali Neamati Saleh Mohaghegh Hazrati Mohammad Reza Khakzad Shakeeb Hassan Moosavi Zahra Gholamnezhad 《Clinics (S?o Paulo, Brazil)》2014,69(7):491-496
OBJECTIVE:
The effects of natural adjuvants on lung inflammation and tracheal responsiveness were examined in sensitized guinea pigs.METHODS:
The responses of guinea pig tracheal chains and the serum levels of interleukin-4 and interferon-gamma were examined in control pigs and three other groups of guinea pigs: the sensitized group and two other sensitized groups treated with either adjuvant G2 or adjuvant G2F (n = 7 for each group). Sensitization of the animals was achieved by injection and inhalation of ovalbumin.RESULTS:
The results showed that sensitized animals had increased tracheal responsiveness and increased serum levels of interleukin-4 and interferon-gamma compared to controls (p<0.05 to p<0.001). Treatments with either G2 or G2F prevented the increase in tracheal responsiveness and serum interleukin-4 (p<0.01 to p<0.001). However, the serum levels of interferon-gamma and the interleukin-4-to-interferon-gamma ratio was increased in the treated groups (p<0.001 for all cases).CONCLUSIONS:
These results indicate important preventive effects of two natural adjuvants, particularly G2, on the changes in tracheal responsiveness, serum cytokines and the interleukin-4-to-interferon-gamma ratio (T helper 1/T helper 2 balance) in sensitized guinea pigs. 相似文献150.