The dioecious plant Silene latifolia has heteromorphic sex chromosomes, and comparison of the positions of sex-linked genes indicates that at least three large inversions have occurred during the evolution of the Y chromosome. In this article, we describe the isolation of a new sex-linked gene from S. latifolia, which provides new information on the evolution of this plant's young sex chromosom...

OBJECTIVES To inform control strategies undertaken as part of an outbreak of Shigella flexneri 3a among men who have sex with men (MSM). METHODS All men aged ≥18 years diagnosed with S flexneri 3a between October 2012 and May 2013 were invited to participate. Semistructured in-depth quantitative interviews were conducted to explore lifestyle and sexual behaviour factors. RESULTS Of 53 men d...

The influence of intertrial interval durations ranging from 7 to 30 s upon sucrose detection thresholds of sixteen subjects was investigated by means of a modified staircase procedure with intertrial rinses. In addition, the influence of the sex of the subject was examined. Neither the intertrial interval nor the sex of the subject significantly affected sucrose detection thresholds. The result...

Two experiments test the prediction derived from the evolutionary view of jealousy that men are particularly concerned with a mate s sexual infidelity and women with a mate s emotional infidelity. Experiment 1 examines sex differences with respect to the information men and women actively request from their partner when suspecting her or his infidelity. Experiment 2 tests the hypothesis that wi...

in order to investigate seroprevalence of turkey's chlamydiosis in khuzestan province, 270 turkeys, of different sex and ages from different parts of khuzestan province were bleed and their sera were tested for antibodies to chlamydophila psittaci using an enzyme-linked immunosorbent assay (immunocomb-ils). according to results the seroprevalences of chlamydiosis were 58.9% in tested turke...

New Zealand (NZ) is a high risk country for multiple sclerosis (MS) with an overall age and sex standardised prevalence of 73.1 per 100,000 population. The age and sex standardised prevalence within the Māori population is substantially lower at 24.2 per 100,000 population. A latitudinal gradient exists with MS prevalence increasing threefold from the North (37°S) to the South (48°S) of NZ. Ove...

Analysis of visual observations of the Mira-type variable star S Sex showed that the period of pulsation has decreased strongly since 1984 from 264.8 days to 249.4 days. The cycle length variations were tested by the method of contingency tables and by the span test, so that random or accumulative errors in the period variation were excluded. Our results are in good agreement with the theoretic...

One explanation for the success of sexual reproduction is that sex increases the efficacy of natural selection. Recombination and segregation lead to fitness variance among offspring which then offers a wider target for natural selection. Consequently, adaptation to changing environments is accelerated and population mean fitness will increase. We investigated whether low levels of sex are asso...

In the plant genus Silene, separate sexes and sex chromosomes are believed to have evolved twice. Silene species that are wholly or largely hermaphroditic are assumed to represent the ancestral state from which dioecy evolved. This assumption is important for choice of outgroup species for inferring the genetic and chromosomal changes involved in the evolution of dioecy, but is mainly based on ...