Relationship between Mandarin speech reception thresholds and pure-tone thresholds in the geriatric population.

BACKGROUND/PURPOSE: In the geriatric population, the reliability of pure-tone threshold (PTT) is sometimes poorer than that in young adults because of various reasons. This study assessed the relationship between Mandarin speech reception thresholds (SRTs) and PTTs in the aged and developed SRT as a measure for corroborating PTT. METHODS: This prospective study enrolled 46 consecutive subjects over 60 years of age. The results of SRT and PTT were collected from one ear randomly selected from each subject. Simple linear and multiple regressions were used to determine the correlation and linear regression coefficients between SRTs and PTTs at various frequencies. RESULTS: In the simple regression analysis, the correlation coefficient was highest at 1000 Hz (r = 0.949) and 500 Hz (r = 0.922), followed by 250 Hz (r = 0.850) and 2000 Hz (r = 0.792). In the multiple regression model with SRT as the dependent variable and PTTs as predictor variables, the resultant multiple correlation coefficient R was 0.967, while R2 was 0.936. In this model, PTTs at the frequencies of 500 Hz and 1000 Hz contributed significantly to the variance in SRTs with p values of 0.029 and < 0.001, respectively. These results demonstrated that the Mandarin SRT is strongly associated with PTTs at the frequencies of 500 Hz and 1000 Hz. CONCLUSION: This study established the agreement between Mandarin SRTs and PTTs in the low tone area of speech frequencies in the geriatric population. In clinical settings, SRT test can be rapidly and easily performed and is relatively inexpensive. It is a vital indicator of the accuracy of PTT measurement.     

孕酮受体拮抗剂ZK98299类似物的合成

为寻找新的、活性强且毒副作用小的孕酮受体拮抗剂，从３，３－乙撑二氧－５α、１０α－环氧－△（９（１１））－雌烯－１７－酮（１）开始经四步反应得到孕酮受体拮抗剂ＺＫ９８２９９类似物（１２）、（１３）及其Ｃ（１７）差向异构体（１０）、（１１），化合物（３～１３）均未见文献报道，目的物（１０～１３）的生物活性正在进行测试。     

心脏创伤35例报告

本文报告心脏创伤３５例。年龄最小７岁，最大６８岁，其中包括心脏刺伤患者１０例，心肌挫伤患者２５例，死亡５例。作者强调快速确定诊断，紧急剖胸心包切开减压和心脏修补止血是心脏刺伤救治成功的关键。同时，对心肌挫伤的临床表现、早期诊断和及时处理等问题进行了讨论。     

人胎黑质细胞的冷冻保存

采用台盼蓝染色法，观察了第３～６月人胎黑质细胞冷冻保存的细胞存活率，结果：①胎龄３～６月人胎黑质细胞冷冻保存后均可存活，但以胎龄３和４月细胞存活率较高。②液氮保存的细胞存活率不受保存时间的影响，而４℃保存的细胞存活率随保存时间的延长而逐渐降低。结果提示，液氮保存人胎黑质细胞的保存条件以胎龄３和４月为宜。     

儿科结肠灌洗护理难点分析与对策

2006年3月-2007年10月我科对57例患儿给予结肠灌洗,对护理中出现的难点进行了分析并采取应对措施,取得了满意效果.现报告如下.     

斑点免疫渗滤法检测丙肝IgG抗体试剂盒的研制

用基因工程重组的丙肝抗原包被于硝酸纤维素膜，建立了检测丙肝ＩｇＧ抗体的斑点免疫渗滤法。与ＥＬＩＳＡ试剂盒进行双盲式同步测定，二法检验结果差异无显著性。渗滤法简便快速，适用于各级医院，有很强的推广价值。     

过氧化氢对白色念珠菌DNA破坏的研究

本文用热变性温度法研究一定浓度 H_2O_2对 C.albicans DNA 破坏作用。结果表明,经6%和10%H_2O_2处理后,C.albicans DNA G c Mol%(分别为28.1±0.82和14.4±1.51)显著低于对照 DNA G C Mol%(85.9±0.62),并推断 H_2O_2可能作用于 C.albicans DNA 碱基以及其间的氢键上;DNA 电泳图谱发现,经3%和6%H_2O_2处理的 C.albicans DNA 电泳带明显不同于对照,提示 H_2O_2更易造成 C.albicans DNA 核苷酸链的降解或断裂.H_2O_2对 C.albicans DNA 的破坏,增强了其杀菌作用。