While the conditions that favour the maintenance of cooperation have been extensively investigated, the significance of non-social selection pressures on social behaviours has received little attention. In the absence of non-social selection pressures, patches of cooperators are vulnerable to invasion by cheats. However, we show both theoretically, and experimentally with the bacterium Pseudomo...

This study examined the reliability of the Spanish version of the MSCEIT, with a sample of 946 college and high school students (426 males, 520 females) ranging from 16 to 58 years old. After the translation and back-translation process, the objectives of this study were: 1) to examine the reliability of the Spanish version of the MSCEIT v.2.0 at the total scale, area, branch and subscale level...

different species of streptomyces are common in most types of soil. some certain species are plant pathogenic especially on potato. this study was conducted to evaluate genetic diversity among some local streptomyces spp. strains isolated from soil and infected tubers in potato farms in northwest of iran. repetitive dna elements (box, eric and rep) as genetic markers were used for diversity stu...

Poverty reduction is entirely determined by the growth rate of population’s mean per capita income and by the change in the distribution of income. This places the empirical relation between growth and inequality at the heart of poverty reducing strategies. This study, which estimates the relation for Paraguay, aims to identify the growth effects of income and education inequality while control...

Recent research has shown a resurgence of interest in the study of gender differences in schizophrenia. Accumulated evidence suggests that, compared with women, men have a higher incidence of schizophrenia, earlier age of onset, poorer course and medication response, poorer premorbid social and intellectual functioning, fewer affective symptoms, lower family morbid risk of schizophrenia and aff...

In many bird and mammal species, males are significantly larger than females. The prevailing explanation for larger-sized males is that sexual selection drives increased male size. In addition, researchers commonly assume that the extent of dimorphism indicates the strength of selection for increased size in males. Here, through reconstruction of ancestral morphology for males and females of on...

When the insurer has access to information about test status, genetic insurance can handle the negative effects of genetic testing on insurance coverage and income distribution. Hence, efficient testing is promoted. When information about prevention and test status is private, two types of social inefficiencies may occur; genetic testing may not be done when it is socially efficient and genetic...

Almost 40 years ago, evidence from large studies of adult twins and their relatives suggested that between 30 and 60% of the variance in social and political attitudes could be explained by genetic influences. However, these findings have not been widely accepted or incorporated into the dominant paradigms that explain the etiology of political ideology. This has been attributed in part to meas...

BACKGROUND Suicide rates vary markedly between areas but it is unclear whether this is due to differences in population composition or to contextual factors operating at an area level. AIMS To determine if area factors are independently related to suicide risk after adjustment for individual and family characteristics. METHOD A 5-year record linkage study was conducted of 1,116,748 non-inst...

Work design research typically views employee work characteristics as being primarily determined by the work environment and has thus paid less attention to the possibility that the person may also influence employee work characteristics and in turn accounts for the work characteristics–well-being relationships through selection. Challenging this conventional view, we investigated the role of a...