全文获取类型
收费全文 | 2108篇 |
免费 | 137篇 |
国内免费 | 17篇 |
专业分类
耳鼻咽喉 | 47篇 |
儿科学 | 95篇 |
妇产科学 | 86篇 |
基础医学 | 164篇 |
口腔科学 | 133篇 |
临床医学 | 234篇 |
内科学 | 499篇 |
皮肤病学 | 60篇 |
神经病学 | 200篇 |
特种医学 | 122篇 |
外科学 | 287篇 |
综合类 | 21篇 |
一般理论 | 1篇 |
预防医学 | 79篇 |
眼科学 | 64篇 |
药学 | 97篇 |
中国医学 | 1篇 |
肿瘤学 | 72篇 |
出版年
2024年 | 1篇 |
2023年 | 28篇 |
2022年 | 28篇 |
2021年 | 73篇 |
2020年 | 55篇 |
2019年 | 79篇 |
2018年 | 77篇 |
2017年 | 83篇 |
2016年 | 88篇 |
2015年 | 110篇 |
2014年 | 111篇 |
2013年 | 152篇 |
2012年 | 175篇 |
2011年 | 156篇 |
2010年 | 72篇 |
2009年 | 94篇 |
2008年 | 156篇 |
2007年 | 157篇 |
2006年 | 120篇 |
2005年 | 145篇 |
2004年 | 108篇 |
2003年 | 77篇 |
2002年 | 44篇 |
2001年 | 23篇 |
2000年 | 11篇 |
1999年 | 22篇 |
1998年 | 6篇 |
1997年 | 2篇 |
1996年 | 4篇 |
1995年 | 2篇 |
1990年 | 2篇 |
1986年 | 1篇 |
排序方式: 共有2262条查询结果,搜索用时 31 毫秒
101.
Hatice Demiray Nurhayat Tabanca Alden S. Estep James J. Becnel Betül Demirci 《Saudi Pharmaceutical Journal》2019,27(6):877-881
Stachys tmolea subsp. tmolea Boiss. is endemic to Turkey and is a species of the genus Stachys L. which is one of the largest genera of the family Lamiaceae with about 300 species. The aims of this study were to examine the chemical composition of the essential oil and n-hexane extract of S. tmolea subsp. tmolea as natural sources of insecticidal activity against the dengue vector, Aedes aegypti. Analysis of the essential oil by GC-FID and gas chromatography-mass spectrometry (GC-MS) systems identified hexahydrofarnesyl acetone (15%), viridiflorol (10%), hexadecanoic acid (7%) and 9-geranyl-p-cymene (6%) as major components. The volatile components of the n-hexane extract were extracted using headspace solid-phase microextraction (HS-SPME) and were analyzed using GC-MS. The principal constituents were 3,4-dimethyl decane (16%), 3-methyl-3-pentanol (15%), 2-methyl-2-pentanol (12%), 1,4-bis (1,1-dimethylethyl) benzene (12%), heptanal (10%), acetic acid (6%) and decane (4%). Bioassay of the n-hexane extract, at 5 µg/mosquito, produced 90% mortality against adult Ae. aegypti while the S. tmolea essential oil demonstrated 13% mortality. No larvicidal activity was observed both in essential oil and n-hexane extract. Further studies are needed to assess the adulticidal activity of the responsible compounds in the crude extract. 相似文献
102.
103.
F. Yıldız M.D B. Kelle M.D D.A. Taş M.D B. Kaya M.D E. Altun M.D E. Erken M.D 《Zeitschrift für Rheumatologie》2014,73(8):754-757
The systemic disorder of mineral and bone metabolism which is related to chronic kidney disease (CKD) is called mineral and bone disorder (MBD). Calcifications related to CKD-MBD may occur in ophthalmic tissue, arterial walls, subcutaneous and periarticular soft tissues and organs. The vascular calcifications are the most important causes of mortality and morbidity in CKD. Here, we present a case of systemic lupus erythematosus with early and disseminated calcifications of vascular and periarticular soft tissues related to CKD-MBD. 相似文献
104.
105.
Perihan Yasemen Canoz Elif Afat Fatih Temiz Nuri Onur Azizoglu Hatice Bulbul Citilcioglu Gokhan Tumgor Goksel Leblebisatan Mehmet Turgut 《Indian journal of hematology & blood transfusion》2014,30(1):46-48
Hemophagocytic lymphohistiocytosis (HLH) is a clinical condition which result in cytotoxic Tcell and antigen presenting cell overproduction and also their cytokines. Hepatitis A Virus associated HLH is very rare condition among other viruses. This condition is often difficult to diagnose, so treatment is often delayed. Here we present a case of adolescent boy with secondary virus associated HLH diagnosis with Hepatitis A infection and successfull treatment by short course of intravenous immunoglobulin and steroid. 相似文献
106.
107.
Hatice Tankisi Kirsten PugdahlMarit Otto Anders Fuglsang-Frederiksen 《Clinical neurophysiology》2014,125(10):2115-2121
Objective
Anatomical variation of the sural nerve has been documented in numerous cadaver studies. The sural nerve conduction parameters can potentially be influenced by the sural nerve type A formation formed by the union of the medial sural cutaneous nerve (MSCN) and the peroneal communicating branch (PCB) and the type C formation with the sural nerve formed solely by the PCB.Methods
In 17 out of 240 prospectively examined subjects referred for polyneuropathy a suspicion of an anatomical variation of the sural nerve was raised due to decreased amplitude or substantial side-to-side variation (>50%) of the sensory nerve action potential (SNAP) in disproportion to the clinical findings. To verify the variation the sural nerve was examined further with surface electrodes and near-nerve technique, including extra lateral and distal needle placements.Results
In all 17 subjects an anatomical variation affecting the sural SNAP was confirmed as a normal sural SNAP could be obtained by changing the electrode placement. The most frequent variation, seen in 15 subjects, was a type A formation with union of the MSCN and the PCB distally at low calf, while a type C formation was seen in 2 subjects.Conclusions
In case of a decreased sural SNAP amplitude or substantial side-to-side variation in disproportion to the neurologic evaluation, an anatomical variation instead of pathology could be suspected and a different electrode placement be considered.Significance
Neurophysiologists should be aware of different types of formations of the sural nerve which may cause misinterpretations of nerve conduction studies, especially when needle electrodes are used. 相似文献108.
Mehmet Serdar Kutuk Ali Yikilmaz Mahmut Tuncay Ozgun Mehmet Dolanbay Mehmet Canpolat Semih Uludag Gulsum Uysal Mustafa Tas Karakukcu Musa 《Child's nervous system》2014,30(3):411-418
Background
The aim of this study was to present our experience with six cases of fetal intracranial hemorrhage (ICH) in terms of prenatal diagnostic features, and postnatal outcome.Methods
The database of prenatal diagnosis unit was searched for antenatally diagnosed ICH cases. Maternal characteristics, ultrasound (US), and magnetic resonance imaging (MRI) findings, clinical course, and postnatal outcome were noted.Results
We evaluated six consecutive cases of fetal ICH. One case was terminated at 24 weeks, and remaining five cases were delivered between 34 and 38 weeks. Five cases (5/6) had intraventricular, and one (1/6) had intraparenchymal hemorrhage. Hemorrhages were right sided in five cases (5/6), left sided in one case (1/6). Dilated and echogenic ventricular wall were the common US findings. No predisposing factor was detected in four of the cases, and intrauterine growth restriction was an underlying factor in two fetuses. Intrauterine progression of the hydrocephaly, and parenchymal thinning was seen in four cases (4/6). In three of four cases (3/4) with progressive grade 3–4 hemorrhage and hydrocephaly, postnatal outcome were dismal, and one case had mild neurological impairment at three months. In one case which had non-progressive mild ventriculomegaly, the lesion regressed after 4 weeks, and had normal short-term outcomeConclusion
Fetal ICH can be accurately identified and categorized by antenatal sonography, and fetal MRI. Although intrauterine regression or normal short-term postnatal outcome is possible, the outcome is usually poor for fetuses with high grade and/or progressive lesions. Therefore, further studies assessing long-term postnatal outcome are needed 相似文献109.
Achmet Ali Demet Altun Bahadir Hakan Oguz Mehmet Ilhan Fatma Demircan Kemalettin Koltka 《Journal of anesthesia》2014,28(2):222-227
Purpose
In patients who are hospitalized for surgery, anxiety disorders are frequently observed. Anxiety affects the patient’s perception of postoperative pain and has a negative impact on recovery from anesthesia. This study attempted to compare the effect of preoperative anxiety on postoperative pain control and recovery from anesthesia in patients undergoing laparoscopic cholecystectomy.Methods
A total of 80 patients were enrolled who were undergoing laparoscopic cholecystectomy. Demographic characteristics of the patients were recorded. Beck’s anxiety ?nventory (BAI) was administered to the patients: patients with anxiety were included in the high-anxious patient group (group H) and patients without anxiety were enrolled in the low-anxious group (group L). Duration of surgery, duration of anesthesia, extubation time, and adverse effects were recorded. During the postoperative period, patient-controlled analgesia with tramadol was used for pain control. Visual analog scale (VAS) scores and tramadol consumption of all patients were recorded.Results
Among all patients, 31 (38.75 %) patients had preoperative anxiety, and significant correlation was found between the days of hospitalization and preoperative score of BAI. In group L, extubation time, the time for the modified Aldrete score to reach 9, was seen as significantly shorter and fewer postoperative side effects were determined. Also in group L, postoperative VAS score and tramadol consumption were significantly lower, and less tenoxicam was needed.Conclusion
A high preoperative anxiety level negatively affects recovery from anesthesia and control of postoperative pain. In this patient group, the increased need for postoperative analgesia must be adequately met. 相似文献110.
Sadık Yurttutan Ramazan Ozdemir Fuat Emre Canpolat Mehmet Yekta Oncel Hatice Germen Unverdi Bülent Uysal Ömer Erdeve Ugur Dilmen 《Pediatric surgery international》2014,30(1):71-77