In addition, the reduction of the enzymatic antioxidant activity has been associated with impairment of cognitive performances at both the central nervous system and the peripheral blood levels. The reduction of serum level of SOD activity is associated with a distressed personality, characterized by the tendency to experience prevalently negative emotions and to inhibit the expression of these emotions in a social context. Further, serum SOD and GPx activities of anxious patients were recently found to be significantly lower than those of controls. The purpose of this study was to investigate if the antioxidant networkmay be implicated in trait EI. The relationships of these biological variables with the trait EI scores of healthy subjects were examined. Research on emotionsand EI specifically has revealed gender differences across several emotion-related attributes, although at the global construct level these differences tend to average out in the case of trait EI, which is the focus of this studyought to be integrated within extant models of personality. Finally, future research in this area will inevitably need to examine males, who tend to differ from women across a range of emotion-related attributes subsumed under various EI constructs and may show different developmental trajectories in these qualities. Benzoylaconine Symbionts can greatly affect the evolution, ecology and behaviour of their hosts. This affect is dependent on the specific phenotypic effect, the transmission route and tissuetropism of the symbiont, all of which interact. Specialisation for particular transmission Gambogic-acid routes is seen in many symbionts. This is often manifest by infections being focussed on specific tissues that are integral to the transmission route. For example, malaria enhances transmission to humans by infecting mosquito salivary glands, infections of the faecal-orally transmitted microsporidian Nosema apis are confined to the midgut of its honeybee hosts, and certain serovars of the sexually 
transmitted Chlamydia trachomatis specifically infect the epithelial cells of the genital tract. Within the Rickettsia, transovarial vertical transmission can be high, but horizontally transmission to mammals from their tick hosts is enhanced by increased replication of the bacteria in the midgut epithelia. The investigation of tissue-specific symbiont densities could therefore provide valuable insights into the transmission route utilised. Wolbachia has been described as the greatest ever panzootic, infecting many insect species as well as a wide diversity of other arthropods and filarial nematodes. It is an obligate intracellular endosymbiont which appears to be highly adapted for maternal vertical transmission. In filarial nematodes this specialisation has led to a mutualism forming whereby Wolbachia is integral to the reproduction of the host. In arthropods Wolbachia is best known for its female-biased distortion of host sex ratioswhich increase vertical transmission or the comparative fitness of infected females. However, the effects of Wolbachia in arthropods are now known to be more diverse, ranging from a beneficial influence on host survival and resistance to other parasites, to detrimental effects that can even cause host death. Additionally phylogenetic analysis of host co-association provides evidence that there is also significant horizontal transmission of Wolbachia over evolutionary timescales.