Students’ Attitudes Toward Gene Technology: Deconstructing a Construct

Journal of Science Education and Technology - Emergent technologies are commonly characterized as involving cutting-edge developments while lacking wide-scale public implementation. Although...     

Genetics of muscle strength and power: polygenic profile similarity limits skeletal muscle performance

Environmental and genetic factors influence muscle function, resulting in large variations in phenotype between individuals. Multiple genetic variants (polygenic in nature) are thought to influence exercise-related phenotypes, yet how the relevant polymorphisms combine to influence muscular strength in individuals and populations is unclear. In this analysis, 22 genetic polymorphisms were identified in the literature that have been associated with muscular strength and power phenotypes. Using typical genotype frequencies, the probability of any given individual possessing an "optimal" polygenic profile was calculated as 0.0003% for the world population. Future identification of additional polymorphisms associated with muscular strength phenotypes would most likely reduce that probability even further. To examine the genetic potential for muscular strength within a human population, a "total genotype score" was generated for each individual within a hypothetical population of one million. The population expressed high similarity in polygenic profile with no individual differing by more than seven genotypes from a typical profile. Therefore, skeletal muscle strength potential within humans appears to be limited by polygenic profile similarity. Future research should aim to replicate more genotype-phenotype associations for muscular strength, because only five common genetic polymorphisms identified to date have positive replicated findings.     

Interpreting the Cultural Revolution politically

Abstract

This essay reviews the recent work of three sociologists, Andrew Walder, Alessandro Russo, and Joel Andreas, on factionalism in the Chinese Cultural Revolution (CR). To varying degrees, all three authors under review question the dominant sociological interpretation of CR factionalism, which directly links factional allegiance to objective class position, and they each attempt to develop a political interpretation instead. Politics, however, is understood differently by the authors. Walder argues that, through attending to the ‘event sequence’ of the CR in which factionalism emerged, factional politics can be de‐linked from the sociological base to which it is usually tied. Russo, influenced by the work of Alain Badiou and Sylvain Lazarus, argues that the factionalism of the CR should be linked to the emergence of a subjective ‘political sequence’ and not to the pre‐existing structural organization of Chinese socialism. Unlike Walder, for whom mass politics seems to be firmly identified with elite intra‐party power struggle, for Russo a space between elite power struggles and the pluralization of mass political organizations allowed a genuine subjective politics to emerge. Joel Andreas employs Pierre Bourdieu’s concepts of political and cultural capital in order to study the development of CR factions in the Qinghua Attached Middle School and Qinghua University, painting a complex political and sociological understanding of factionalization. These works not only offer reinterpretations of the CR itself, but also help to generate interesting questions about the political relationship between the present and the 1960s, both in China and globally.     

Integration of Sequential Information for Shape Perception by Infants: A Developmental Study

Perception of form by spatiotemporal integration was investigated in 3 experiments. In the first, infants aged 8, 10, and 12 months were tested using a novelty-preference procedure to determine the earliest age at which recognition of rectilinear and curvilinear form occurred. Infants were shown a light-point tracing of the outline of a figure, followed by simultaneous presentation of 2 test objects, one of the same shape as the tracing and one of a different shape. The tracing was double the size of the test objects. Only infants in the oldest group responded selectively by looking longer at the object of different shape. In the second experiment with 12-month-old infants only, it was shown that recognition of rectilinear, but not curvilinear, form occurred despite a difference in the orientation and size of tracing and object. Computer-generated tracings were used in the final experiment to compare form recognition for 2D and 3D stimuli. Selective responding occurred only for the latter. These findings show that by 12 months infants perceive the correspondence between the figural properties of a tracing and its extended form, but that this perception is dependent on the provision of depth cues.