全文获取类型
收费全文 | 1178篇 |
免费 | 52篇 |
国内免费 | 12篇 |
专业分类
耳鼻咽喉 | 27篇 |
儿科学 | 25篇 |
妇产科学 | 41篇 |
基础医学 | 73篇 |
口腔科学 | 11篇 |
临床医学 | 71篇 |
内科学 | 262篇 |
皮肤病学 | 13篇 |
神经病学 | 41篇 |
特种医学 | 153篇 |
外科学 | 238篇 |
综合类 | 14篇 |
一般理论 | 1篇 |
预防医学 | 55篇 |
眼科学 | 35篇 |
药学 | 80篇 |
中国医学 | 10篇 |
肿瘤学 | 92篇 |
出版年
2023年 | 4篇 |
2022年 | 19篇 |
2021年 | 31篇 |
2020年 | 17篇 |
2019年 | 29篇 |
2018年 | 35篇 |
2017年 | 25篇 |
2016年 | 19篇 |
2015年 | 24篇 |
2014年 | 37篇 |
2013年 | 63篇 |
2012年 | 69篇 |
2011年 | 98篇 |
2010年 | 64篇 |
2009年 | 54篇 |
2008年 | 77篇 |
2007年 | 102篇 |
2006年 | 81篇 |
2005年 | 63篇 |
2004年 | 44篇 |
2003年 | 54篇 |
2002年 | 47篇 |
2001年 | 20篇 |
2000年 | 8篇 |
1999年 | 16篇 |
1998年 | 7篇 |
1997年 | 10篇 |
1996年 | 9篇 |
1995年 | 3篇 |
1994年 | 5篇 |
1993年 | 5篇 |
1992年 | 6篇 |
1991年 | 13篇 |
1990年 | 6篇 |
1989年 | 6篇 |
1988年 | 4篇 |
1987年 | 9篇 |
1986年 | 6篇 |
1985年 | 6篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1981年 | 3篇 |
1977年 | 10篇 |
1976年 | 2篇 |
1975年 | 2篇 |
1974年 | 3篇 |
1969年 | 2篇 |
1968年 | 3篇 |
1967年 | 2篇 |
1966年 | 2篇 |
排序方式: 共有1242条查询结果,搜索用时 15 毫秒
41.
A 10-year-old girl presented with diabetic ketoacidosis, shock, and severe abdominal pain. She was found to have acute pancreatitis and acute kidney injury after shock resuscitation and severe persistent hypertriglyceridemia. The severe hypertriglyceridemia was treated with 1 course of plasmapheresis, which corrected the triglyceride level and was temporally associated with improvement of the abdominal pain and renal dysfunction. Diabetes is known to contribute to an elevated triglyceride level, especially in the setting of an underlying lipid disorder. However, no such disorders were found in this patient. To the best of our knowledge, this is the first report of a pediatric patient presenting with the triad of severe hypertriglyceridemia, diabetic ketoacidosis, and pancreatitis treated successfully with plasmapheresis. 相似文献
42.
Mahmoud Rafaat Kandil Kawthar Abdel-Motagally Fadel Hossam Eldin Khalifa Mostafa Kamel Ghanem Khaled Osama Mohamed 《Neurological research》2013,35(3):232-241
AbstractObjectives: Headache is one of the most common complaints in medicine. Epidemiological and population-based studies reported that migraine has a variable prevalence worldwide. This study was done to estimate the prevalence of migraine across various age groups in Assiut district, Egypt.Methods: This is a door-to-door study. It included 4700 randomly selected individuals.Results: Headache was reported in 1668 subjects (35.49%), of them, 87.65% (n = 1462) had primary headaches. Migraine prevalence was 10.51% with female-to-male ratio of 2.4:1 particularly in ages of 20–40 years. The mean age of patients was 31.46 ± 13.39 years and age at onset was 24.16 ± 12.10 years. Nearly, 63.5% had frequent attacks, 65.2% of the attacks were severe enough to stop daily activities and lasted for >1 day in 32.5% of females compared to 40.7% and 14.5% for males. Chronic or daily migraine was more in females (35.3% versus 20.7% for males). Approximately, 5.6% had chronic migraine and 1.2% had daily migraine from the start, while 24.2% had transformation from episodic to chronic migraine within 6.1 ± 4.4 years. Migraine was prevalent among those with middle educational levels and labor workers. The duration of migraine attacks was found to reduce with age but the chronic/daily migraine increased with age. Hypertension, anxiety, irritable bowel syndrome, and depression were common comorbidities with migraine.Conclusions: We believe that the work done in this study is informative as it determined the actual prevalence of migraine across various age groups and the important predictors of change in the severity, duration, and frequency of migraine in our locality. 相似文献
43.
Wong CY Qing F Savin M Campbell J Gates VL Sherpa KM Lewandowski RJ Nagle C Salem R 《Journal of vascular and interventional radiology : JVIR》2005,16(8):1101-1106
PURPOSE: To assess the response of hepatic metastases after treatment with intraarterial yttrium 90 radioembolization (ie, use of SIR-Spheres) with use of [18F]fluorodeoxyglucose (FDG) positron emission tomography (PET). MATERIALS AND METHODS: Nineteen patients with metastatic cancer to the liver from various solid tumors with progression despite polychemotherapy were included. All patients underwent baseline computed tomography, FDG PET, hepatic angiography, and intraarterial technetium 99 m macroaggregated albumin scan for assessment of lung shunting fraction. Patients were treated with 90Y resin microspheres on a lobar basis and were monitored for 3 months with use of dedicated attenuation-corrected PET. For each patient, regions of interest were drawn along the liver edge to measure total liver standard uptake value (SUV) on axial images, covering the entire liver. Visual estimates were also performed and graded as +1, 0, -1, -2, or -3 for progression, no change, and mild, moderate, and dramatic improvement by posttreatment PET. RESULTS: The median absorbed dose for the tumor was 76 Gy. There was a significant overall decrease in total liver SUV after treatment (baseline, 71,134 +/- 38,055; after SIR-Sphere treatment, 59,941 +/- 26,509; P = .028) for the entire group. Visual estimates placed 15 patients (79%) in response categories (-3 to -1) and four patients (21%) in nonresponse categories (0 to +1) for the liver. The percentage change of total liver SUV after treatment in the response group (-19%) was significantly greater and different in direction than that in the nonresponse group (+27%; P = .03). This percentage change was also correlated significantly with the respective visual estimates (r = 0.72; P < .0005) for each individual patient. Three patients had major complications related to hyperbilirubinemia (transient, n = 1; permanent, n= 2). CONCLUSIONS: The results suggest that there is significant reduction of hepatic metastatic load as evaluated objectively by PET after 90Y radioembolization for the treatment of unresectable metastatic disease to the liver. 90Y radioembolization provides encouraging results by arresting progression of metastatic cancer to the liver. 相似文献
44.
45.
46.
Riad Almasri DDS Carl J. Drago DDS MS Sharon Crane Siegel DDS MS Patrick C. Hardigan PhD 《Journal of prosthodontics》2011,20(4):267-274
Purpose: To compare the volumetric misfit between implant restorative platforms of implants and implant frameworks manufactured with two different technologies. One set of implant frameworks was made with a CAD/CAM protocol and a tactile probe; the second protocol consisted of frameworks made with the lost‐wax technique and conventional casting technology. Materials and Methods: In this laboratory study, an acrylic resin model with five “inter‐foraminal” implants was used as the “patient” model. Implant level impressions were made, and 10 definitive master casts were fabricated. The casts were verified using an index made on the patient model. Five cast high palladium noble alloy and five CAD/CAM titanium alloy frameworks were fabricated. The patient's implants and the frameworks’ implant restorative platforms were scanned with a tactile probe, and the data were digitized. The digitized implant restorative platforms of the frameworks were fit onto the patient's digitized implants via a software program, in a process called “lofting.” This computerized procedure simulated a 1‐screw test; the process was performed on both sides. The volumetric misfit between the implant restorative platforms of the frameworks and the patient's implants were measured. A Welch's t‐test was used to determine significant differences (p < 0.05) between the misfit of the two technologies. Wilcoxon Signed‐Rank tests were used to evaluate differences between the right and left sides. Results: On average, the volumetric misfit of the CAD/CAM frameworks was 1.8 mm3 less than the volumetric misfit of the cast alloy frameworks (p < 0.05). The Wilcoxon Signed‐Rank tests showed no significant differences between the right and left sides within both systems (p > 0.05). Conclusions: The scanning technology and computer software program used in this study demonstrated that the CAD/CAM implant frameworks had statistically significantly less volumetric misfit when compared with the cast implant frameworks. There were no significant differences between the right and left 1‐screw tests within the same type of frameworks. 相似文献
47.
Ajay K. Israni Samy M. Riad Robert Leduc William S. Oetting Weihua Guan David Schladt Arthur J. Matas Pamala A. Jacobson DeKAF Genomics Investigators 《Transplant international》2013,26(10):982-989
Most calcineurin inhibitor (CNI)‐based protocols reduce blood trough goals approximately 2–3 months post‐transplant in clinically stable kidney transplant recipients. The CNI target trough level to prevent rejection, after reduction, is unknown. Using a multivariate Cox proportional hazards model, we determined the association of time‐varying tacrolimus (TAC) trough levels with acute rejection (AR) occurring in the first 6 months post‐transplant, but specifically we assessed this association after 3 months. A total of 1930 patients received TAC‐based immunosuppression prior to AR in a prospective study. Of the 151 (7.8%) who developed AR, 47 developed AR after 3 months post‐transplant. In an adjusted time‐varying multivariate model, each 1 ng/ml decrease in TAC trough levels was associated with a 7.2% increased risk of AR [hazards ratio (HR) = 1.07, 95% confidence interval (CI) (1.01, 1.14) P = 0.03] in the first 6 months. There was an additional 23% increased risk of AR with each 1 ng/ml decrease in the TAC trough levels in months 3–6 [HR = 1.23, 95% CI (1.06, 1.43) P = 0.008]. In conclusion, lower TAC trough levels were significantly associated with increased risk of AR in the first 6 months post‐transplant with additional risk of AR between months 3 and 6 post‐transplant. The timing and practice of TAC dose reduction should be personalized based on the individual's risk factors. 相似文献
48.
A wide range of injuries could affect the bladder and lead to eventual loss of its integrity, with the need for replacement or repair. Augmentation ileocystoplasty is considered till now the gold standard option for bladder replacement, despite its associated complications. Bladder tissue engineering appears as an appealing alternative through development of biological substitutes, which could restore structural and functional aspects of damaged tissues and organs.Tissue engineering relies upon three essential pillars; the scaffold, the cells seeded on scaffolds and lastly the environmental conditions, including growth factors, cytokines and extracellular matrix (ECM) which promote angiogenesis and neurogenesis of the regenerated organs. The choice of the scaffold and the type of cells is a crucial and fundamental step in regenerative medicine. In this review article, we demonstrated these three crucial factors of bladder tissue engineering, with the pros and cons of each scaffold type and cell type used. 相似文献
49.
Ahmed-Emad Mahfouz Hanan Sherif Amel Saad Matthias Taupitz Sergej Filimonow Dietmar Kivelitz Bernd Hamm 《European radiology》2001,11(6):965-969
The aim of this study was to assess a possible association between breast malignancy and ipsilateral higher vascularity on
gadolinium-enhanced MR angiography. One hundred six patients were examined by dynamic gadolinium-enhanced 3D MR imaging. Magnetic
resonance angiographic views were generated by image subtraction and maximum intensity projection. The study included 85 patients
with unilateral malignant breast neoplasms and 21 with unilateral benign lesions. Three blinded readers independently reviewed
the MR angiograms after masking the lesions and the corresponding contralateral sites. The readers were asked to determine
whether vascularity was higher on the right side, higher on the left side, or equal on both sides. The results were analyzed
by the Kappa statistic and Pearson's chi-square test. The blood vessels of the breasts were clearly seen in all cases. There
was good agreement among the observers (kappa > 0.54 ) in assessing vascularity on both sides. Breasts harboring malignant
neoplasms were found to have a higher vascularity than the contralateral breasts (p < 0.005). This sign of malignancy had a sensitivity of 76.5 %, a specificity of 57 %, and an accuracy of 72.6 %. Blood vessels
of the breast can be depicted by MR angiography. Unilateral malignant neoplasms are associated with a higher ipsilateral vascularity.
In conjunction with other indications of malignancy on gadolinium-enhanced MR images, a higher ipsilateral vascularity may
serve as an additional sign of malignancy.
Received: 4 April 2000 Revised: 14 August 2000 Accepted: 18 August 2000 相似文献
50.
Free functioning gracilis transplantation for reconstruction of elbow and hand functions in late obstetric brachial plexus palsy 下载免费PDF全文
Tarek A. El‐Gammal M.D. Amr El‐Sayed M.D. Mohamed M. Kotb M.D. Waleed Riad Saleh M.D. Yasser Farouk Ragheb M.D. Omar Refai M.D. Mohamed Mohamed Morsy M.D. 《Microsurgery》2015,35(5):350-355
Background: In late obstetric brachial plexus palsy (OBPP), restoration of elbow and hand functions is a difficult challenge. The use of free functioning muscle transplantation in late OBPP was very scarcely reported. In this study, we present our experience on the use of free functioning gracilis transfer for restoration of elbow and hand functions in late cases of OBPP. Patients and Methods: Eighteen patients with late OBPP underwent free gracilis transfer for reconstruction of elbow and/or hand functions. The procedure was indicated when there was no evidence of reinnervation on EMG and in the absence of local donors. Average age at surgery was 102.5 months. Patients were evaluated using the British Medical Research Council (MRC) grading system and the Toronto Active Movement Scale. Hand function was evaluated by the Raimondi scoring system. Results: The average follow‐up was 65.8 ± 41.7 months. Contraction of the transferred gracilis started at an average of 4.5 ± 1.03 months. Average range of elbow flexion significantly improved from 30 ± 55.7 to 104 ± 31.6 degrees (P <0.001). Elbow flexion power significantly increased with an average of 3.8 grades (P = 0.000147). Passive elbow range of motion significantly decreased from an average of 147 to 117 degrees (P = 0.003). Active finger flexion significantly improved from 5 ± 8.3 to 63 ± 39.9 degrees (P < 0.001). Finger flexion power significantly increased with an average 2.7 grades (P < 0.001). Only 17% achieved useful hand (grade 3) on Raimondi hand score. Triceps reconstruction resulted in an average of M4 power and 45 degrees elbow extension. Conclusion: Free gracilis transfer may be a useful option for reconstruction of elbow and/or hand functions in late OBPP. © 2015 Wiley Periodicals, Inc. Microsurgery 35:350–355, 2015. 相似文献