Background Glaucoma can cause progressive damage to retinal ganglion cells. These cells can be classified as cells projecting to the superior colliculus and mel
AIM:To evaluate gallstone incidence and risk factors in a large population-based study.METHODS:Gallstone incidence and risk factors,were evaluated by structured
以中置式高密度沉淀池为载体,向池内投加粉末活性炭,利用高密度沉淀池的污泥回流系统对粉末活性炭进行富集和回用,延长其在沉淀池中的停留时间,考察投加粉末活性炭后对有机物的强化去除效果,并进行了投炭量优化研究。结果表明:该投加方式能显著改善对有机物的去除效果,相比不投加炭,对CODMn的去除率提高了近10%。通过增加污泥回流比可减少投炭量,在去除率相同的情况下,污泥回流比为5%时的投炭量较回流比为3%时
Three new compounds,including one chloro-furoeremophilanoid (1),one eremophiladiolide (2),a rare dimer of nor-furoeremophilanoid,ligulatrovine A (3),and a known
Pancreatic somatostatinoma represents a rare group of neuroendocrine tumors,which was first reported by Ganda and Larsson in 1977.Less than 50 cases have been r
应用GC-MS分析方法对全国75处自来水厂原水及出厂水中苯、甲苯、乙苯、二甲苯、苯乙烯等7种苯系物进行了分析。结果表明:除1处原水水样含有苯(浓度为0.000 6 mg/L)外,其余原水和出厂水中苯系物浓度均低于GC-MS检测限。对含有苯的原水水样进行健康风险评价,计算得到其化学致癌物风险值为1.03×10-6,大于美国环保局提出的最大可接受值(10-6)。对机器检测限对应的苯系物浓度进行健康风险
AIM: To examine the risk of colorectal neoplasm in acromegalic patients by meta-analyzing all relevant controlled studies.METHODS: Extensive English language me
二沉池是活性污泥系统中的重要处理单元,其运行好坏会直接影响污水处理厂的出水水质,为此采用数值模拟方法进行了二沉池的结构优化研究。借助Fluent软件,结合实际沉淀柱试验结果,首先对拟采用的模型进行了验证,其模拟精度高达97%。运用该模型,以北京市某污水处理厂的辐流式二沉池为研究对象,研究了二沉池中导流筒高度和水平位置对内部速度场和浓度场的影响,结果显示,这两个参数都会影响水流在二沉池中的停留时间,
Background The relationship between cyclosporine-induced chronic nephrotoxicity (CAN) and renin-angiotenein Ⅱ in humans is still contradictory. This study was
Fibro-muscular dysplasia (FMD) is a rare but well documented disease with multiple arterial aneurysms. The patients, usually women, present with various clinica