Genetic and environmental influences on reading and listening comprehension

We report preliminary behaviour genetic analyses of reading and listening comprehension from The Colorado Learning Disabilities Research Center. Although the twin sample with these new measures is still of limited size, we find substantial, and significant, genetic influences on individual differences in both reading and listening comprehension. In addition, word recognition and listening comprehension each accounted for significant independent genetic influences on reading comprehension. Together, they accounted for all the genetic influence on reading comprehension, indicating a largely genetic basis for the ‘simple model’ of individual differences in reading comprehension proposed by Hoover and Gough (1990) .     

The pains of imprisonment: Exploring a classic text with contemporary authors

While classic texts on the prison have long been an important resource for those teaching courses on corrections, prison life has changed dramatically since many of these works were written. For this reason, some instructors may choose to drop classic texts in favor of more recent works. This essay examines recent firsthand accounts of prison written by Ted Conover, Victor Hassine, and Leonard Peltier and argues that such works may be used in conjunction with classic texts to provide students with an exciting, contemporary, and theoretically sophisticated account of prison life. By comparing these recent works to a particular classic text, Sykes's Society of Captives, this essay illustrates this potential for symbiosis and demonstrates some of the ways in which new works provide opportunities to extend our understanding of the classics. When used with classic texts, recent firsthand accounts offer instructors opportunities to illustrate and explain the significance of abstract concepts, to examine issues of continuity and change in corrections theory, and to encourage critical thinking on important issues.     

Inducing self-rotation of cells with natural and artificial melanin in a linearly polarized alternating current electric field

The phenomenon of self-rotation observed in naturally and artificially pigmented cells under an applied linearly polarized alternating current (non-rotating) electrical field has been investigated. The repeatable and controllable rotation speeds of the cells were quantified and their dependence on dielectrophoretic parameters such as frequency, voltage, and waveform was studied. Moreover, the rotation behavior of the pigmented cells with different melanin content was compared to quantify the correlation between self-rotation and the presence of melanin. Most importantly, macrophages, which did not originally rotate in the applied non-rotating electric field, began to exhibit self-rotation that was very similar to that of the pigmented cells, after ingesting foreign particles (e.g., synthetic melanin or latex beads). We envision the discovery presented in this paper will enable the development of a rapid, non-intrusive, and automated process to obtain the electrical conductivities and permittivities of cellular membrane and cytoplasm in the near future.     

Maternal social support as a predictor of mother-child stress and stimulation

There is increasing interest in the role of social support in determining risk for child abuse and neglect. The present study assessed the relationship between maternal social support and two areas: stress in the mother-child relationship: and level of stimulation provided in the home. Maternal social support was assessed prenatally and at a two-year follow-up, while the latter variables were compiled at the two-year follow-up. The data were obtained from 38 urban, low SES (80% on public assistance) mothers and their 2-year-old children. Maternal social support correlated positively with level of stimulation and negatively with level of mother-child stress, and was the best predictor of both, relative to any SES, mother or child variables. In addition, high stress, low support mothers provided significantly less stimulation to their children. The theoretical implications for social support as a mediator variable as well as its implications for early identification and prevention efforts in abuse and neglect are discussed.     

Concentrated or Fragmented? The U.S. Market for Online Higher Education

Research in Higher Education - As the financial challenges facing the U.S higher education industry mount, colleges and universities seek new activities that can improve their financial situation....