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排序方式: 共有843条查询结果,搜索用时 15 毫秒
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目的:探讨莱菔硫烷(sulforaphane,SFN)对氧化低密度脂蛋白(oxidized low-density lipoprotein,ox-LDL)诱导血小板活化的影响及其可能的分子机制。方法:在体外实验中,将健康人纯化血小板与不同浓度的SFN(1.0、2.5、5.0μmol/L)共同孵育40 min,然后用ox-LDL激活血小板20 min,并检测血小板活化的指标,包括CD62P的表达、胞内血小板因子4(platelet factor4,PF4)和趋化因子配体5(chemokine ligand 5,CCL5)的释放水平。机制上,用Western blot蛋白免疫印迹法检测血小板肉瘤酪氨酸激酶(sarcoma tyrosine kinase,Src)及其下游的脾酪氨酸激酶(spleen tyrosine kinase,Syk)磷酸化水平;用活性氧(reactive oxygen species,ROS)检测试剂盒测定胞内总ROS水平。结果:ox-LDL诱导的血小板CD62P的表达以及PF4和CCL5的释放水平均可被SFN显著抑制(P <0.05);SFN显著下调ox-LD... 相似文献
3.
目的:对耳大神经及腮腺筋膜解剖进行再认识,由此改良腮腺切除手术方法。方法:解剖成人尸体10侧,术中活体解剖20侧,对耳大神经和腮腺筋膜的解剖要素进行观察。根据观察结果进行改良腮腺切除术14例,即在腮腺筋膜表面翻瓣后,由前向后另翻腮腺筋膜瓣,切除腮腺后将筋膜瓣复位缝合,完整保留耳大神经和腮腺筋膜。结果:耳大神经在下颌角水平之上0-2cm依次分耳后、耳垂、耳前支,神经主干末段和分支起始段均分布于腮腺筋膜浅层表面,后者致密,其致密纤维包裹在神经周围。改良手术后2例(14.3%)发生轻度Frey’s综合征,无1例发生术区皮肤长期麻木、长期面瘫、涎瘘及肿瘤复发。结论:耳大神经各分支和腮腺筋膜具有不可代替的解剖生理功能,改良术式能将两者完好保留,显著降低术后并发症。 相似文献
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M. Martea Y. A. Hekster T. B. Vree A. J. Voets J. H. M. Berden 《Pharmacy World & Science》1987,9(2):110-116
Cefradine and co-trimoxazole pharmacokinetics were studied in a patient with peritonitis that complicated continuous ambulatory peritoneal dialysis (CAPD). Concentrations in the plasma reached after oral administration of 500 mg cefradine four times daily and 400/80 mg co-trimoxazole four times daily were for cefradine 100g/ml, for trimethoprim 15g/ml, and for sulfamethoxazole 100/ml, respectively. In the dialysate concentrations were reached of 35–70/ml cefradine, 2–5/ml trimethoprim and 8–17g/ml sulfamethoxazole. The values for sulfamethoxazole are regarded too low to be clinically effective. Half-lives protein binding values and CAPD clearances are presented. Low CAPD clearances were obtained during the night and high values during the day. The dosage yielded too high plasma trimethoprim concentrations, while sulfamethoxazole dialysate concentrations were too low. It seems questionable therefore whether co-trimoxazole can be used orally for the treatment of CAPD peritonitis. 相似文献
6.
Guus MJ Bökkerink Maja Joosten Erik Leijte Maud YA Lindeboom Ivo de Blaauw Sanne MBI Botden 《Journal of pediatric surgery》2021,56(3):465-470
BackgroundMinimal invasive surgery (MIS) is increasingly used for the correction of congenital diaphragmatic hernia (CDH) and esophageal atresia (EA). It is important to master these complex procedures, preferably preclinically, to avoid complications. The aim of this study was to validate recently developed models to train these MIS procedures preclinically.MethodsTwo low cost, reproducible models (one for CDH and one for EA) were validated during several pediatric surgical conferences and training sessions (January 2017–December 2018), used in either the LaparoscopyBoxx or EoSim simulator. Participants used one or both models and completed a questionnaire regarding their opinion on realism (face validity) and didactic value (content validity), rated on a five-point-Likert scale.ResultsOf all 60 participants enrolled, 44 evaluated the EA model. All items were evaluated as significantly better than neutral, with means ranging from 3.7 to 4.1 (p < 0.001). The CDH model was evaluated by 48 participants. All items scored significantly better than neutral (means 3.5–3.9, p < 0.001), with exception of the haptics of the simulated diaphragm (mean 3.3, p = 0.054). Both models were considered a potent training tool (means 3.9).ConclusionThese readily available and low budget models are considered a valid and potent training tool by both experts and target group participants.Type of studyProspective study.Level of evidenceLevel II. 相似文献
7.
T. B. Vree E. W. J. Van Ewijk-Beneken Kolmer E. W. Wuis Y. A. Hekster 《Pharmacy World & Science》1992,14(5):325-331
Probenecid shows dose-dependent pharmacokinetics. When in one volunteer the dose is increased from 250 to 1,500 mg orally, thet
1/2 increased from 3 to 6 h. TheC
max was 14g/ml with a dosage of 250 mg, 31g/ml with 500 mg, 70g/ml with 1,000 mg and 120g/ml with 1,500 mg. Thet
max remained 1 h for all four dosages. The AUC/dose ratio increased with the dose, indicating nonlinear elimination. The total body clearance declined from 64.5 ml/min for 250 mg to 26.0 ml/min for 1,500 mg. The renal clearance of probenecid remained constant, 0.6–0.8 ml/min. Protein binding of probenecid is high (91%) and independent of the dose. The phase I metabolites show lower protein binding values (34–59%). The protein binding of probenecid glucuronidein vitro (spiked plasma) is 75%. Probenecid is metabolized by cytochrome P-450 to three phase I metabolites. Each of the metabolites accounts for less than 10% of the dose administered; the percentage recovered in the urine is independent of the dose. The main metabolite probenecid glucuronide is only present in urine and not in plasma. The renal excretion rate-time profile of probenecid glucuronide shows a plateau value of approximately 700g/min (46 mg/h) with acidic urine pH. The duration of this plateau value depends on the dose: 2 h at 500 mg, 10 h at 1,000 mg and 20 h at 1,500 mg. It is demonstrated that probenecid glucuronide must be formed in the kidney during its passage of the tubule. The plateau value in the renal excretion rate of probenecid value reflects itsV
max of formation. 相似文献
8.
男性海洛因依赖者性机能研究 总被引:1,自引:0,他引:1
目的 研究海洛因对男性性机能的影响。方法 对91例男性海洛因依赖者进行了性机能调查研究,并做性激素测定和分析。结果 男性海洛因依赖者性机能明显障碍,表现为性幻想减少,性欲减退,性高潮减退,性交频率降低。男性睾酮(T)及催乳素(PRL)均低于正常对照组(Z=8.118,P〈0.01;Z=4.444,P〈0.01),促黄体生成素(LH)及促卵泡刺激素(FSH)均高于正常对照组(Z=2.094,P〈0.05;Z=2.086,P〈0.05),雌二醇(E2)与正常对照组无统计学意义。结论 海洛因可致机体下丘脑-垂体-性腺轴功能紊乱,影响性机能,并且性问题在海洛因依赖性形成机制和戒断上的意义值得进一步探讨。 相似文献
9.
目的:探讨脑得生提取物的安全性。方法:观察脑得生提取物对清醒脚犬心电图、血压、呼吸和小鼠一般行为、神经系统和运动协调功能的影响。结果:脑得生提取物在1.5~15g/kg给药剂量,对清醒Beagle犬的收缩压、舒张压、呼吸频率以及心电图指标无明显影响。脑得生提取物在10~30g/kg给药剂量,对清醒小鼠的一般行为和运动协调功能没有明显影响;100g/kg给药剂量对小鼠的翻正反射和爬杆试验有一定影响,在给药后2小时完全恢复。结论:脑得生提取物对动物心血管系统、呼吸系统及中枢神经系统均无明显影响。 相似文献
10.