Major mergers with small galaxies:the discovery of a Magellanic-type galaxy at z=0.12

We report on the serendipitous discovery of a star-forming galaxy at redshift z = 0.116 with morphological features that indicate an ongoing merger. This object exhibits two clearly separated components with significantly different colors, plus a possible tidal stream. Follow-up spectroscopy of the bluer component revealed a low star-forming activity of 0.09 M⊙ yr−1 and a high metallicity of 12 + log(O/H) = 8.6. Based on comparison with mass–star formation-rate and mass–metallicity relations, and on fitting of spectral energy distributions, we obtain a stellar mass of 3 × 109 M⊙, which renders this object comparable to the Large Magellanic Cloud. Thus our finding provides a further piece of evidence of a major merger already acting on small, dwarf-galaxy-like scales

Design project: Viper

The design specification of the primary flight trainer are: must conform to F.A.R. 23, including the crashworthiness standards; is limited to two to four occupants; engine must be FAA certified; must comply with FAA standards for VFR and allow for upgrade to IFR flights; must be at least utility category with good spin recovery characteristics; must have a structural lifetime of at least 10,000 flight hours; capable of either of two training missions: climb to 5,000 ft., cruise 500 Nm. plus reserve, land, or climb to 1,000 ft. and descend ten cycles for landing practice, climb to 3,000 ft., maneuver at two g's for 15 minutes, cruise 100 Nm. and land; must have a cruise speed of at least 120 knots; must take-off or land on a runway no longer than 3,000 ft; and has a cost goal of $50,000, not including avionics, for production of 1,000 airplanes over a five year period

Childhood Abuse and Age at Menarche

Purpose—Physical and sexual abuse are prevalent social hazards. We sought to examine the association between childhood physical and sexual abuse and age at menarche. Methods—Among 68,505 participants enrolled in the Nurses’ Health Study II we investigated the association between childhood physical abuse and sexual abuse on menarche prior to age 11 (early) or after age 15 (late) using multivariate logistic regression analysis, mutually adjusting for both types of abuse. Results—Fifty-seven percent of respondents reported some form of physical or sexual abuse in childhood. We found a positive dose-response association between severity of sexual abuse in childhood and risk for early menarche. Compared to women who reported no childhood sexual abuse, the adjusted odds ratio [AOR] for early menarche was 1.20 (95% confidence interval [CI], 1.10, 1.37) for sexual touching and 1.49 (95% CI, 1.34, 1.66) for forced sexual activity. Only severe physical abuse predicted early menarche (AOR=1.22, 95% CI, 1.10–1.37). Childhood physical abuse had a dose-response association with late age at menarche: AOR 1.17 (95% CI, 1.04, 1.32) for mild, 1.20 (95% CI, 1.08, 1.33) for moderate, and 1.50 (95% CI, 1.27, 1.77) for severe physical abuse. Sexual abuse was not associated with late menarche. Conclusion—Childhood abuse was very prevalent in this large cohort of U.S. women. Severity of childhood sexual abuse was associated with risk for early onset of menarche, and physical abuse was associated with both early and late onset menarche. Implications and Contribution—The severity of childhood sexual abuse and severe physical abuse were associated with risk for accelerated menarche, while severity of childhood physical was associated with risk for delayed onset of menarche. The nature of the association between different forms of childhood adversities and reproductive lifespan may vary

Theorising social class and its application to the study of health inequalities

The literature on health inequalities often uses measures of socio-economic position pragmatically to rank the population to describe inequalities in health rather than to understand social and economic relationships between groups. Theoretical considerations about the meaning of different measures, the social processes they describe, and how these might link to health are often limited. This paper builds upon Wright’s synthesis of social class theories to propose a new integrated model for understanding social class as applied to health. This model incorporates several social class mechanisms: social background and early years’ circumstances; Bourdieu’s habitus and distinction; social closure and opportunity hoarding; Marxist conflict over production (domination and exploitation); and Weberian conflict over distribution. The importance of discrimination and prejudice in determining the opportunities for groups is also explicitly recognised, as is the relationship with health behaviours. In linking the different social class processes we have created an integrated theory of how and why social class causes inequalities in health. Further work is required to test this approach, to promote greater understanding of researchers of the social processes underlying different measures, and to understand how better and more comprehensive data on the range of social class processes these might be collected in the future