马克思的商品生产论

Arthur(2002)对马克思有关资本和商品生产理论所作的诠释,虽然很清楚地说明了马克思《资本论》第一卷的缘起,但是却使他们看起来像带有“理想式”弹簧(‘ideal’springs)的幽灵之钟。我将证明,应当把“价值”看作商品生产的社会关系的一种终极性的世俗属性,     

Blood pressure reactivity in adult male twins

The purpose of the present investigation was to examine possible genetic contributions to cardiovascular reactivity by contrasting patterns of association in 82 monozygotic (MZ) and 88 dizygotic (DZ) adult male twin pairs (age range = 21 to 61 years, M = 35 years). Systolic blood pressure (SBP), diastolic blood pressure (DBP), and heart rate (HR) were recorded during baseline and during a mental arithmetic task (i.e., serial subtraction). The task produced significant elevations in all three cardiovascular measures (i.e., 10 mmHg SBP, 8 mmHg DBP, and 6 bpm HR, respectively). Levels of SBP and DBP reactivity were significantly correlated in MZ pairs but not in DZ pairs. Statistical tests suggest a heritability estimate of about 50% that was marginally significantly for SBP and DBP changes during the task. There was no indication of a genetic influence on HR reactivity. Resting level and static task period measures of SBP, DBP, and HR demonstrated statistically significant heritability estimates of 60% to 80%.