全文获取类型
收费全文 | 3679篇 |
免费 | 222篇 |
国内免费 | 19篇 |
专业分类
耳鼻咽喉 | 36篇 |
儿科学 | 178篇 |
妇产科学 | 60篇 |
基础医学 | 472篇 |
口腔科学 | 270篇 |
临床医学 | 260篇 |
内科学 | 506篇 |
皮肤病学 | 80篇 |
神经病学 | 131篇 |
特种医学 | 110篇 |
外科学 | 680篇 |
综合类 | 89篇 |
一般理论 | 4篇 |
预防医学 | 166篇 |
眼科学 | 92篇 |
药学 | 445篇 |
1篇 | |
中国医学 | 33篇 |
肿瘤学 | 307篇 |
出版年
2023年 | 31篇 |
2022年 | 83篇 |
2021年 | 133篇 |
2020年 | 79篇 |
2019年 | 97篇 |
2018年 | 131篇 |
2017年 | 101篇 |
2016年 | 119篇 |
2015年 | 127篇 |
2014年 | 156篇 |
2013年 | 215篇 |
2012年 | 310篇 |
2011年 | 303篇 |
2010年 | 152篇 |
2009年 | 156篇 |
2008年 | 174篇 |
2007年 | 169篇 |
2006年 | 124篇 |
2005年 | 93篇 |
2004年 | 88篇 |
2003年 | 70篇 |
2002年 | 67篇 |
2001年 | 69篇 |
2000年 | 53篇 |
1999年 | 57篇 |
1998年 | 50篇 |
1997年 | 39篇 |
1996年 | 30篇 |
1995年 | 28篇 |
1994年 | 22篇 |
1993年 | 21篇 |
1992年 | 49篇 |
1991年 | 43篇 |
1990年 | 36篇 |
1989年 | 48篇 |
1988年 | 28篇 |
1987年 | 41篇 |
1986年 | 27篇 |
1985年 | 30篇 |
1984年 | 24篇 |
1983年 | 29篇 |
1982年 | 13篇 |
1981年 | 20篇 |
1980年 | 15篇 |
1979年 | 15篇 |
1977年 | 17篇 |
1976年 | 16篇 |
1975年 | 16篇 |
1974年 | 24篇 |
1973年 | 13篇 |
排序方式: 共有3920条查询结果,搜索用时 15 毫秒
81.
Sahil Sood Lavanya Gurram Dheera Aravindakshan John Paul Supriya Chopra Jamema Swamidas Akshay Patil Umesh Mahantshetty 《Brachytherapy》2021,20(3):550-556
PurposeThe study is an audit of reporting dose and volume specifications as per the ICRU 58 for MUPIT-based interstitial brachytherapy in gynecological cancers. Correlation between total reference air kerma (TRAK) and isodose surface was also evaluated to understand the intensity of treatment in interstitial brachytherapy.Methods and MaterialsForty-two patients underwent HDR MUPIT-based interstitial brachytherapy 20 Gy in five fractions after EBRT during 2017–2019. Treated volume, high and low-dose regions, mean central dose, Dose Homogeneity Index (DHI), organ at risk doses, and TRAK values were computed.ResultsHigh-dose regions V150 mean was 12.4 cc and V200 was 4.58 cc; and low-dose region was 75.92 cc. The mean treated volume was 59.8 cc. The mean central dose was 3.7 Gy. DHI was 79%. The mean D2cm3 bladder and rectum were 2.9 Gy and 2.8 Gy. The mean TRAK was 0.16 cGy per fraction per hour at 1 m. TRAK values showed significant correlation with various isodose volumes (TRAK and V100: r = 0.943 p < 0.0005; and TRAK and V50: r = 0.953; p < 0.0005). A positive correlation was observed between TRAK and the number of needles (r = 0.746; p < 0.0005). At a median followup of 16 months, 4 of 42 patients (9.5%) had local recurrences.ConclusionsOur study shows compliance with ICRU 58 recommendations along with certain deviations. Local recurrence rate is acceptable. TRAK shows correlation with surface isodose in MUPIT-based brachytherapy and should to be evaluated in future studies. 相似文献
82.
Purpose
The aim of the study was to assess the distribution of accessory foramina in the mandibular body with computed tomography (CT).Materials and methods
The CT images of the mandibular body in 300 subjects (183 females and 117 males aged between 12 and 85 years) were retrospectively analysed for the presence of accessory foramina. The buccal and lingual surfaces were examined by dividing them into anterior and posterior quadrants.Results
Of the 300 subjects, 26 presented with accessory foramina on buccal posterior aspect and 70 subjects presented on buccal anterior aspect. Further, on the lingual posterior aspect, 132 subjects presented with accessory foramina and 59 subjects presented on lingual anterior aspect. Most of the subjects with accessory foramina in the buccal posterior, buccal anterior and lingual anterior regions had accessory foramina on other aspects of the mandible as well.Conclusion
A substantial number of subjects presented with accessory foramina on the lingual posterior aspect when compared to other aspects. Nevertheless, the number of subjects with accessory foramina on other aspects of the mandible was considerable and cannot be ignored. It is suggested that when an accessory foramen is identified in an individual on a particular aspect of the mandibular body, it is highly probable that he will exhibit accessory foramina on other aspects as well. 相似文献83.
Vadlamudi Tharanath Kaldis Athanasios Divi Venkataramana Sai Gopal Patil Basavaprabhu L. Voloudakis Andreas E. 《Virus genes》2021,57(5):469-473
Virus Genes - Citrus yellow mosaic badnavirus (CMBV) causes mosaic disease in all economically important citrus cultivars of India, with losses reaching up to 70%. CMBV belongs to the genus... 相似文献
84.
Chhaya V Verma Rachna D Arora Hetal M Mistry Swati V Kubal Nandini S Kolwankar Pranali C Patil Anushka A Dalvi Sonal A Vichare Akhila Natesan Anagha N Mangaonkar Dolly D Kanakia Gayatri S Jere Karan Y Bansode Madhura R Patil Rajvi D Sheth Sandhya D Dudhavade Sayali D Mhatre Suresh K Patel Akanksha G Mohite Ankita N Bhavsar Jessica E Alfonso Maryam NA Syed Nidhi P Savla Riya N Rajgond Rutuja A Bute Samiksha M Mane Shubham R Jaiswal Vibhawari A Parab Abhiram M Kasbe Mohan A Joshi Ramesh N Bharmal 《Indian Journal of Critical Care Medicine》2021,25(3):317
85.
Oral and Maxillofacial Surgery - To compare the intraoperative utility of bur and saw and to examine the pattern of lingual split during bilateral sagittal split osteotomy of mandible. This study... 相似文献
86.
V. V. Burungale Hyojung Bae A. S. Kamble J.-H. Kim P. S. Patil J.-S. Ha 《RSC advances》2020,10(48):28492
Carbon doping from a Ti precursor in TiO2 synthesized by a hydrothermal method was studied. The structural, optical and morphological study of the deposited material was carried out using X-ray diffraction, UV-vis spectroscopy and scanning electron microscopy characterization techniques. The elemental composition of the TiO2 deposited with different precursor concentrations was studied using X-ray photoelectron spectroscopy and electron dispersive X-ray spectroscopy. The amount of elemental carbon in the TiO2 matrix is found to be increased as the Ti precursor concentration is increased, which strengthens the proposed idea of carbon doping via a Ti precursor.Interstitial carbon doping is possible directly from a Ti precursor (titanium(iv) isopropoxide) without using any other carbon source. 相似文献
87.
Junyi Wang Guddadarangavvanahally Krishnareddy Jayaprakasha Bhimanagouda S. Patil 《Yao wu shi pin fen xi = Journal of food and drug analysis.》2020,28(2):217
Accurate assays of plant antioxidants and other phytochemicals require efficient extraction conditions and enable rigorous assessments of crop varieties and production systems. This study assessed the extraction of phytochemicals and antioxidants from conventionally or organically grown red and golden beets (Beta vulgaris L.), using twenty solvent (S1–S20) mixtures containing water, methanol, and ethanol alone or with acids (ascorbic, formic, acetic). Red beetroot extracted with methanol with or without acid had the highest betanin content (2791.0 μg/g and 8222.3 μg/g of fresh weight [FW], respectively) and golden beetroot extracted with methanol/ascorbic acid/water had the highest vulgaxanthin I (193.7 μg/g and 15.0 μg/g of FW, respectively). The radical-scavenging activity and total phenolics in beetroot extracts reflected the different extraction efficiency of each solvent. UHPLC-QTOF-MS was used to identify twenty-seven phytochemicals, including 23 betalains, 2 amino acids, and 2 phenolic acids. Chemometric approaches discriminated the beet varieties and different extracts within one variety based on the composition and abundance of the key phytochemicals. The red beetroot extracted with aqueous ethanol with or without acid (S5, S7, S8, S9), and golden beetroot extracted with methanol-containing solvents (S15 for conventionally and S20 for organically) had the highest levels of phytochemicals, suggesting that these conditions efficiently extract key phytochemicals. 相似文献
88.
89.
Satish M. Kale Nikunj B. Mody Surendra B. Patil Pranam Sadawarte 《Indian Journal of Plastic Surgery》2015,48(2):204-207
A urethrocutaneous fistula is a common complication after hypospadias repair, but congenital fistula is a rare anomaly. We present a 16-year-old boy with this unusual anomaly. Its etiology, embryology, and management are discussed in brief.KEY WORDS: Adolescent, congenital fistula of penile urethra, urethroplasty 相似文献
90.
We reviewed our experience of hepaticoduodenostomy done for choledochal cyst from 1982 to 2007 at our center. The aim of the study was to evaluate the efficacy of hepaticoduodenostomy as a mode of biliary reconstruction after surgical resection of choledochal cyst, to look for any complications associated with hepaticoduodenostomy, with review of the literature. A total of 56 patients underwent hepaticoduodenostomy after surgical resection of choledochal cyst, of which 54 patients underwent primary cyst excision with hepaticoduodenostomy and 2 patients underwent redo surgery (hepaticoduodenostomy). Most of the patients had an uneventful postoperative recovery. Early complications were biliary leak in three patients which subsided on conservative treatment. Long-term complication was seen in only one patient who developed anastomotic stricture 18 years after primary resection of choledochal cyst and hepaticoduodenostomy. Hepaticoduodenostomy is a relatively safe procedure with very low complication rates. It requires a single anastomosis and is simple to perform. 相似文献