Determination of oxidative stress levels and some antioxidant enzyme activities in prostate cancer

In this study, the antioxidant enzyme activities such as (SOD, GSH, and CAT) and malondialdehyde (MDA) level which is the end product of lipid peroxidation, were determined from the serum samples taken from patients diagnosed with prostate cancer Van Yuzuncu Y?l University Medical Faculty of Educational Research and Training Hospital and ?stanbul Bagcilar Education Research Hospital. The SOD, GSH, and CAT activity of patient groups was found significantly lower than the healthy control group in patients with prostate cancer (p?相似文献   

Managing Product Rollovers

We study the product rollover strategy decision, where a firm decides whether to phase out an old generation of a product to be replaced by a new with either a dual or single roll. Our model considers a final build of the old product and preannouncement of the new, and incorporates dynamic pricing and inventory decisions. We find that the optimal price path closely follows changes in reservation price curves for the two products over time. We also identify the drivers of the rollover strategy decision, finding that lower market risk (faster diffusion, higher market responsiveness to preannouncements) and higher performance improvement for the new generation are associated with the single roll strategy.     

Evaluating the Significance Test When the Correlation Coefficient is Different from Zero in the Test of Hypothesis

Sample size and correlation coefficient of populations are the most important factors which influence the statistical significance of the sample correlation coefficient. It is observed that for evaluating the hypothesis when the observed value of the correlation coefficient's r is different from zero, Fisher's Z transformation may be incorrect for small samples especially when population correlation coefficient ρ has big values. In this study, a simulation program has been generated for to illustrate how the bias in the Fisher transformation of the correlation coefficient affects estimate precision when sample size is small and ρ has big value. By the simulation results, 90 and 95% confidence intervals of correlation coefficients have been created and tabled. As a result, it is suggested that especially when ρ is greater than 0.2 and sample sizes of 18 or less, Tables 1 and 2 can be used for the significance test in correlations.     

Empirical research opportunities in reverse supply chains

This study reviews the literature in reverse supply chains (RSCs) and develops 10 research propositions to be studied using empirical research methods. Businesses increasingly have to cope with product returns, mandated environmental regulations and increasing costs associated with product disposal. Through effective management of the RSC, managers can improve process efficiencies, customer service, supply chain design, product design, after-market product sales and after-sales service. Most research in RSCs has relied on case studies and optimization models. Opportunities exist to use survey-based research methods to explain current practices, predominant and critical issues, and managerial techniques used to manage the RSC.     

Attitudes towards Women's Work Roles and Women Managers in a Sports Organization: The Case of Turkey

In recent years the need to apply gender equality principles to all sectors of Turkish society has been widely acknowledged and has become an increasingly important issue because of the modernization and recent Europeanization project of Turkey. However, even as this has been acknowledged, attempts to apply gender equality in employment in sports organizations have been mostly ignored. This article reports on the attitudes towards women's work roles and women managers of 83 women and 138 men who work in the General Directorate of Youth and Sport (GDYS) which is the biggest national governing body for sport in Turkey. The findings of this study indicate that both female and male workers in the GDYS scored lower on their attitudes towards women's work roles and held more negative attitudes towards women managers. Although male workers scored higher on attitudes towards women's work roles than female workers they held more negative attitudes towards women managers. In addition, femininity scores were found to be the only predictor of attitudes towards women's career advancement. Finally, we discussed these findings regarding previous studies and the sociocultural context of Turkey.     

Changing perceptions? Effects of multiple social categorisation on German population’s perception of Muslims

Multiple social categorisation is one option for influencing people’s perception such that negative social opinions based on ethnicity, race, or religion decrease or disappear entirely. This study aims to examine German population’s perception of Muslims when multiple categorisation is applied. Based on data of 7341 respondents stemming from a factorial survey experiment used in a national, random-digit-dial telephone survey, we tested the effect of multiple social categorisation using the hypothetical situation of a Muslim marrying into the own family. Multiple categorisation works only when the Muslim in question is a woman. But perception differences between the Muslim woman and the Christian woman do not totally disappear. When the Muslim person in the same scenario is a man, multiple social categorisation has no effect on the perception of respondents. We discuss the implications of these results with regard to the Muslim as category of analysis.     

Estimating the Parameters of the Generalized Lambda Distribution: Which Method Performs Best?

Generalized lambda distribution (GLD) is a flexible distribution that can represent a wide variety of distributional shapes. This property of the GLD has made it very popular in simulation input modeling in recent years, and several fitting methods for estimating the parameters of the GLD have been proposed. Nevertheless, there appears to be a lack of insights about the performances of these fitting methods in estimating the parameters of the GLD for a variety of distributional shapes and input data. Our primary goal in this article is to compare the goodness-of-fits of the popular fitting methods in estimating the parameters of the GLD introduced in Freimer et al. (1988 Freimer, M., Mudholkar, G., Kollia, G., Lin, C. (1988). A study of the Generalized Tukey Lambda family. Communications in Statistics-Theory and Methods 17:3547–3567.[Taylor &; Francis Online], [Web of Science ®] , [Google Scholar]), i.e., Freimer–Mudholkar–Kollia–Lin (FMKL) GLD, and provide guidelines to the simulation practitioner about when to use each method. We further describe the use of the genetic algorithm for the FMKL GLD, and investigate the performances of the suggested methods in modeling the daily exchange rates of eight currencies.     

On a multivariate log-gamma distribution and the use of the distribution in the Bayesian analysis

In this article, we propose a new generalized multivariate log-gamma distribution. We consider the usage of the proposed multivariate distribution as the prior distribution in the Bayesian analysis. The generalized multivariate log-gamma distribution allows for the inclusion of prior knowledge on correlations between model parameters when likelihood is not in the form of a normal distribution. Use of the proposed distribution in the Bayesian analysis of log-linear models is also discussed.     

A Content Analysis of Sexual Consent and Refusal Communication in Mainstream Films

Young adults have limited access to comprehensive sex education. As such, they may seek sexuality information through such alternative sources, such as mass media. Previous research suggests that media, including films and television shows, can influence sexual behaviors and attitudes. Because sexual consent communication is important to sexual experiences, the purpose of this study was to assess how sexual consent and refusal communication were depicted in films. We also examined contextual factors that influence consent and refusal communication, such as gender, relationship status, location, and types of sexual behaviors. Four researchers analyzed popular mainstream films (N = 50) from 2013 based on a codebook developed inductively and deductively. The most common consent and refusal communication cues were nonverbal or implicit. The majority of scenes portrayed consent immediately before sexual activity. We also conducted chi-squared analyses to assess differences in consent and refusal communication based on gender and relationship status. There were no gender differences in the portrayal of consent cues; however, characters in established relationships used nonverbal cues more often than those in novel relationships. Mass media can normalize behaviors, and our results suggest that films may further normalize nonverbal or implicit consent cues.