Associations Between Morbidity and Alternative Measures of Particulate Matter

This paper explores the association between acute respiratory morbidity and different measures of exposure to airborne particulate matter, including sulfates, total suspended particulates, and fine and inhalable particulates. Regression analysis was used to test for the impacts of these alternative measures of particulate matter on respiratory morbidity using the 1979-1981 annual Health Interview Surveys and EPA's Inhalable Particle Monitoring Network. The general results indicate that, of the surrogate measures for particulate matter, sulfates appear to have the greatest association with morbidity. To the extent that sulfuric acid aerosols are correlated with airborne sulfates, the results suggest that respiratory impairment sufficient to lead to days of reduced activity may be related to the existence of acidity in the air. These findings are consistent with the results of ecological studies reporting an association between mortality and exposures to fine particles and sulfates.     

棉花蕾花期喷施高美施的增产效果

棉花蕾花期喷施高美施分别比不施和仅喷清水的处理增产皮棉 1 53 .68kg/hm2 和 1 4 5.58kg/hm2 ,增幅 1 5.3 7%和 1 4 .4 5%。主要表现为单株铃数、铃重、衣分均有所提高 ,且能提早成熟 ,增加伏前桃、伏桃比率和 9月 2 0日前收花率。此外 ,能提高座桃率和降低僵黄花率 ,但对皮棉纤维品质无显著影响     

短乳杆菌产γ-氨基丁酸发酵条件的优化

以短乳杆菌（Lactobacillus brevis）A8为供试菌株,通过单因素和正交实验研究了γ-氨基丁酸合成的最佳工艺条件．结果表明pH对实验效果影响最大,其次分别为温度、低聚异麦芽糖用量和接种量,最佳合成条件依次为pH4．5,温度33％,低聚异麦芽糖用量7g／L,接种量20％．在最优条件下,γ-氨基丁酸产量最高可达19．2g／L．     

Levels of uric acid in erectile dysfunction of different aetiology

Erectile dysfunction is a common disease characterized by endothelial dysfunction. The aetiology of ED is often multifactorial but evidence is being accumulated in favor of the proper function of the vascular endothelium that is essential to achieving and maintaining penile erection. Uric acid itself causes endothelial dysfunction via decreased nitric oxide production. This study aims to evaluate the serum uric acid (SUA) levels in 180 ED patients, diagnosed with the International Index of Erectile Function-5 (IIEF-5) and 30 non-ED control. Serum uric acid was analyzed with a commercially available kit using ModularEVO (Roche, Monza, Italy). Within-assay and between-assay variations were 3.0% and 6.0%, respectively. Out of the ED patients, 85 were classified as arteriogenic (A-ED) and 95 as non-arteriogenic (NA-ED) with penile-echo-color-Doppler. Uric acid levels (median and range in mg/dL) in A-ED patients (5.8, 4.3–7.5) were significantly higher (p?p?相似文献   

Zn（Ⅱ）—H2QS—Zeph荧光光度法测定微量锌的研究

本文研究了表面活性剂（ＳＡＳ）氯化十四烷基苄胺（Ｚｅｐｈ）存在下，锌（Ⅱ）与８－羟基喹啉－５－磺酸（Ｈ２ＱＳ）的荧光反应及适宜的反应条件。实验表明：ＰＨ７．５０～８．１０，以氯仿卒取溶剂激发波长λｅｘ＝４００ｎｍ，荧光波长λｎｍ＝６００ｎｍ处进行荧光强度测定。在０～６ｕｇ／１０ｍｌ范围内锌量与相对荧光强度呈良好的线笥关系，灵敏度呆达０．７７ｕｇ／１０ｍｌＣＨＣ１３，标准偏差Ｓ＝０．９８。     

邻氯苯乙腈水解合成邻氯苯乙酸

邻氯苯乙腈水解制邻氯苯乙酸 ,在以硫酸、水、乙酸按体积比 1∶1∶1的混合酸催化下 ,反应时间 80min ,回流温度 12 0℃ ,可获 86.2 %的收率 .     

γ-亚麻酸提取方法的改进

对一γ-亚麻酸的高产菌株M6进行了含油量测定，并改进了油脂的提取方法：由原来的匀浆破壁改为超声波壁。实验证明此法得到的油含量多，比原法增加12．8％，并节省人力。实验结果得地的含油量最高为45．6％，γ-亚麻酸含量为3．86％－4.93％。实验还发现，当发酵液成为粉红色时，得到的菌体干重最多，为26％，此时的油含量也最多，为45．6％。     

湿地蒿脂肪酸成分研究

采用气相色谱法对湿地蒿脂肪酸成分进行了分析,并探讨了脂肪酸的可利用性。     

实验性鸡尿酸盐沉积症的肾脏病理学研究

120羽35日龄迪卡商品代蛋用雏鸡随机分为高钙组,高蛋白组和对照组。各组分别饲喂高钙(含钙3.9％)、高蛋白(含粗蛋白44.0％)和拿价(含钙0.8％,粗蛋白8.2％)饲料。至试验第25d时,各组剖检5只鸡,并作肾脏的光镜和电镜观察。结果表明:高钙、高蛋白饲料能引发尿酸盐沉积。但高蛋白组眼观病变不明显,肾脏的光镜、电镜病变与高钙组相似,但损伤程度较轻。怍者认为,高钙、高蛋白引起肾脏损害是鸡尿酸盐沉积的重要原因。     

返魂草颗粒中绿原酸含量测定研究

优选返魂草颗粒中绿原酸的提取工艺.设计正交实验,采用水浴和超声波分别对返魂草颗粒中绿原酸的提取方法进行了研究.水浴法的最佳提取工艺条件为:70%乙醇,料液比24:1,40℃水浴回流90 min;超声波法最佳提取工艺条件为:80%乙醇,料液比24:1,预浸渍30 min超声40 min.结果显示超声波提取法所得绿原酸含量较高,以本工艺提取返魂草颗粒绿原酸,绿原酸含量达到3.63 mgYg.