全文获取类型
收费全文 | 286篇 |
免费 | 15篇 |
国内免费 | 5篇 |
专业分类
耳鼻咽喉 | 6篇 |
儿科学 | 12篇 |
妇产科学 | 2篇 |
基础医学 | 45篇 |
口腔科学 | 7篇 |
临床医学 | 54篇 |
内科学 | 46篇 |
皮肤病学 | 9篇 |
神经病学 | 9篇 |
特种医学 | 18篇 |
外科学 | 30篇 |
综合类 | 30篇 |
预防医学 | 15篇 |
眼科学 | 4篇 |
药学 | 5篇 |
中国医学 | 6篇 |
肿瘤学 | 8篇 |
出版年
2022年 | 2篇 |
2021年 | 8篇 |
2020年 | 5篇 |
2018年 | 3篇 |
2017年 | 5篇 |
2016年 | 3篇 |
2015年 | 6篇 |
2014年 | 11篇 |
2013年 | 11篇 |
2012年 | 10篇 |
2011年 | 7篇 |
2010年 | 14篇 |
2009年 | 13篇 |
2008年 | 8篇 |
2007年 | 14篇 |
2006年 | 9篇 |
2005年 | 9篇 |
2004年 | 8篇 |
2003年 | 9篇 |
2002年 | 5篇 |
2001年 | 7篇 |
2000年 | 9篇 |
1999年 | 7篇 |
1998年 | 7篇 |
1997年 | 10篇 |
1996年 | 15篇 |
1995年 | 7篇 |
1994年 | 3篇 |
1993年 | 5篇 |
1992年 | 4篇 |
1991年 | 4篇 |
1990年 | 3篇 |
1989年 | 2篇 |
1988年 | 6篇 |
1986年 | 4篇 |
1985年 | 7篇 |
1984年 | 6篇 |
1983年 | 2篇 |
1982年 | 5篇 |
1981年 | 2篇 |
1980年 | 4篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1976年 | 4篇 |
1975年 | 4篇 |
1971年 | 2篇 |
1964年 | 1篇 |
1959年 | 1篇 |
1954年 | 1篇 |
1936年 | 1篇 |
排序方式: 共有306条查询结果,搜索用时 15 毫秒
31.
ÖZGE GÜNDÜZ M.D. SIBEL ERSOY‐EVANS M.D. AYŞEN KARADUMAN M.D. 《Pediatric dermatology》2009,26(6):750-751
Abstract: Pityriasis rosea (PR) is an acute, self‐limiting papulosquamous disorder of unknown etiology. Published studies of childhood PR are scarce and most are reviews. The aim of this study was to determine the demographic and clinical features of childhood PR. 相似文献
32.
宁夏贝母化学成分的研究 总被引:3,自引:0,他引:3
从宁夏贝母(Frdillapia taipaiensis P. Y. Li var. ningxiaensis Y. K. Yang et. J. K. Wu)的鳞茎中分得六个异甾体生物碱成分,鉴定为宁贝素(taipaienine,Ⅰ)、川贝酮(chuanbeinone,Ⅱ)、西贝素(imperialine,Ⅲ)、贝母乙素(verticinone,Ⅳ)、贝母辛(peimissine,Ⅴ)和异贝母甲素(isoverticine,Ⅵ).其中T为一新C-去甲-D-高甾生物碱。应用波谱分析(IR,MS,1HNMR和13CNMR)等确定了它们的化学结构。 相似文献
33.
Computed tomography (CT) was used to study 25 patients with congenital conductive hearing loss and normal external auditory canals. Deformities were subdivided according to ossicular, fenestral, and cholesteatomatous origin. Isolated ossicular deformities were found in 14 patients (five bilateral), cholesteatoma in eight, oval-window nondevelopment (with ossicular deformity) in one, and normal studies in two (congenital stapes fixation at the level of the annular ligament). Ossicular deformities may be subdivided into incudostapedial disconnections into incudostapedial disconnections (most common), malleoincudal fixations, and stapes fixations. Most are due to developmental anomaly of the first or second branchial arch. The stapes has a dual origin (second arch and otic capsule). A cholesteatoma is defined as congenital only if there is no history of otitis and the tympanic membrane is intact. In this series, six were in the middle ear proper, and two were within the attic beyond otoscopic view. Their CT appearance, with one exception, was essentially identical to that of acquired lesions. 相似文献
34.
Which factors may influence the number of hours spent per week in cafes, and the amount of alcohol consumed in licensed premises, by urban cafe guests in Norway? In 1991 a comprehensive questionnaire survey was undertaken among 1053 visitors to 41 licensed cafes in Oslo, Norway. The five most important predictors of time spent in cafes were: household situation (β=0.20), occupation (β= 0.18), personal economic resources and sex (both β= 0.15) and age (β= 0.11). These factors were also significant predictors of the number of days during the past 4 weeks the respondents had drunk jour glasses or more of alcohol in cafes. Men, people living with others, people with poor economic resources and people not engaged in paid employment or education were the ones who reported spending the most hours per week and the most episodes of “heavy” drinking in cafes during a 4-week period. Visiting and drinking in cafes may be a way of structuring everyday life. 相似文献
35.
36.
CENGIZ GIRGIN AKIF SEZER RUEN UÇ MURAT ERMETE UUR ÖZKAN GÖZEN GÜREL 《International journal of urology》2003,10(10):525-529
BACKGROUND: We evaluated the treatment outcomes of non-transitional cell carcinoma (non-TCC) cases after radical cystectomy. METHODS: Radical cystectomy was performed in 259 invasive bladder cancer patients in our department and of these, 59 (22.7%) were non-TCC. Primary squamous cell carcinomas (SCC), adenocarcinomas and undifferentiated cancers (UC) were grouped as non-TCC of the bladder. Of the 59 non-TCC; 32 SCC, 20 UC, five adenocarcinoma and two sarcomatoid tumor cases were demonstrated. RESULTS: The 5-year disease-specific survival rate of TCC and non-TCC cases were 48.9 and 28.2%, respectively (P = 0.0016). The 5-year disease-specific survival rates of SCC and UC were 25.1 and 23.4%, respectively. The median survival time of SCC, UC and adenocarcinoma cases were 19, 12 and 6 months, respectively (P = 0.4579). The disease-specific survival rates of TCC and non-TCC cases at stage pT2NoMo were 79.1 and 27.2%, respectively (P = 0.0000). The median survival time of SCC, UC and adenocarcinoma cases were 19, 12 and 13.3 months, respectively, for the same stage. The survival time of TCC, SCC and UC cases at stage pT3NoMo were 23, 26 and 45 months, respectively (P = 0.2307). The median survival time at stages pT2-3N1Mo for the same groups were 18, 16 and 11 months, respectively (P = 0.0939). CONCLUSION: The study presented here demonstrates that both TCC and non-TCC cases have poor survival rates in locally advanced disease and that at the pT2NoMo stage the prognosis of non-TCC cases is poor when compared with TCC cases. 相似文献
37.
EN Smit JM Dijkstra TA Schnater E Seerat FAJ Muskiet ER Boersma 《Acta paediatrica (Oslo, Norway : 1992)》1997,86(7):690-695
Abstract Erythrocyte fatty acids and plasma vitamin E concentrations were determined in 47 grade 2 and 21 grade 3 malnourished Pakistani children (ages 4–56 months). Data were compared with those of 26 age- and sex-matched apparently healthy controls. Evaluation with three statistical approaches revealed that both grade 2 and grade 3 malnourished children had decreased erythrocyte ω6 fatty acids and to a lesser extent decreased ω3 fatty acids. These decreases were compensated for by increased ω9 fatty acids. The patients tended to have lower plasma vitamin E concentrations. We conclude that malnourished Pakistani children have low essential fatty acid status, notably those of the ω6 series. The combination of low erythrocyte 22:6ω3 and a low 22:5ω6/22:4ω6 ratio in grade 2 patients suggests low Δ4-desaturation activity, which may be due to impaired peroxisomal β-oxidation. 相似文献
38.
S. MJØEN A. LANGSLET S. E. TANGSRUD A. SUNDBY 《Acta paediatrica (Oslo, Norway : 1992)》1982,71(5):711-715
ABSTRACT. In the present study, auditory brainstem responses (ABR) were recorded in 60 highrisk neonates in the intensive care unit selected by the following criteria: Birth-weight <2000 g, hyperbilirubinemia requiring phototherapy or exchange transfusion, idiopathic respiratory distress syndrome, artificial ventilation, asphyxia, sepsis or meningitis, intracranial haemorrhage, neurological symptoms and potential ototoxic medication (aminoglycoides, furosemide). The infants tested ranged in gestational age from 27-44 weeks. The ABR testing was performed in a sound-proof room using the Madsen (ERA-74) equipment. Four infants did not reveal responses to 70 dB HL ("nonresponders"), and the total of 10 neonates (16.6%) had abnormal ABR-tests, when the physiological changes related to gestational age and conceptional age (gestational age plus the age after birth) were taken into account. The 10 neonates with abnormal tests were reexamined after discharge, and in six there were no improvement of threshold sensitivity. Three of the "nonresponders" were retested several times within the two years after birth (one died at age 18 months of pertussis), and none of them revealed ABR at stimulus intensity of 70 dB HL. They all attend an audiological training program started at age of six months as a consequence of the early diagnosis of impaired auditory function. It is our opinion that a routine ABR-evaluation should be performed on high risk neonates (criteria mentioned above) in the newborn intensive care unit. Retesting of infants with abnormal responses within three months, and several times within the next two years if abnormal responses persist, is important. Transient impairment of auditory functions is not uncommon in these infants. However, the children with persisting hearing impairment should be discovered early to attend an early audiological training program. 相似文献
39.
Summary The authors determined the mitotic activity of the epithelium of the mammary glands, vagina, uterus and the uterine glands at various periods of, pregnancy in female albino mice. As shown, mitotic activity of the mammary glands epithelium exhibited a marked rise during the first half of pregnancy and declined smoothly during the second half. Mitotic activity of the epithelium of the vagina, uterus and the uterine glands decreased. Reduction of mitosis is mostly marked in epithelium of the uterine glands, less in the uterine, epithelium and even less in the vaginal epithelium. A different level of mitotic activity in the epithelium of reproductive organs during pregnancy is explained by different sensitivity of the epithelium these organs to mitosis-stimulating and depressing action of female sex hormones.(Presented by N. A. Kraevskii Active Member of AMN SSSR) Translated from Byulleten' Éksperimental'noi Biologii i Meditsiny, Vol. 57, No. 4, pp. 112–115, April, 1964 相似文献
40.