Rapid Perceptual Learning: A Potential Source of Individual Differences in Speech Perception Under Adverse Conditions?

Challenging listening situations (e.g., when speech is rapid or noisy) result in substantial individual differences in speech perception.

Protein kinase A and protein kinase C(alpha)/PPP1CC2 play opposing roles in the regulation of phosphatidylinositol 3-kinase activation in bovine sperm.

In order to acquire fertilization competence, spermatozoa have to undergo biochemical changes in the female reproductive tract, known as capacitation. Signaling pathways that take place during the capacitation process are much investigated issue. However, the role and regulation of phosphatidylinositol 3-kinase (PI3K) in this process are still not clear.

Role and regulation of PI3K in sperm capacitation and the acrosome reaction.

Mammalian spermatozoa undergo several signaling and biochemical transformations in the female genital tract, collectively called capacitation. The capacitated spermatozoon binds to the egg zona pellucida, where it undergoes the acrosome reaction (AR), a process enabling it to penetrate and fertilize the egg. Actin polymerization occurs in sperm capacitation and depolymerization prior to the AR.

Is seeing believing? Expectant parents' outlooks on coparenting and later coparenting solidarity.

This study examined short- and longer-term sequelae of parents' prenatal expectations of their future family process, and traced subsequent stability in coparenting solidarity from infancy through the toddler years. One hundred and ten couples expecting a first child participated in prenatal assessments of coparenting expectations and differences, and in 3-month post-partum evaluations. Forty-five couples completed subsequent assessments at 12 and 30 months.

The transition to coparenthood: parents' pre-birth expectations and early coparental adjustment at 3 months postpartum.

In the decade since the first observationally based empirical studies of coparenting process in nuclear families made their mark, most investigations of early coparenting dynamics have examined whether and how such dynamics drive child development trajectories, rather than identifying factors that may contribute to the differential development of such dynamics in the first place. In this prospective study, we examined both individual-representational and dyadic-interpersonal predictors of early coparental process. Fifty married couples expecting their first child portrayed their expectations and concerns about family life after the baby's arrival, and took part in a set of problem-solving tasks used to help evaluate marital quality.

Experimental verocytotoxemia in rabbits.

The clinicopathologic effects of intravenously administered purified verocytotoxin 1 (VT1; Shiga-like toxin 1) in 2-kg male rabbits was studied. The 50% lethal dose was 0.2 micrograms of protein per kg of body weight (2 x 10(4) 50% cytotoxic doses per kg).