Genetic variation may partially underlie complex personality and physiological traits—such
as impulsivity, risk taking and stress responsivity—as well as a substantial proportion of …

Background: To examine whether the tryptophan hydroxylase (TPH) gene, which codes for
the rate-limiting enzyme in the biosynthesis of serotonin, may be a factor influencing …

Alternative microbial hosts have been engineered as biocatalysts for butanol biosynthesis.
The butanol synthetic pathway of Clostridium acetobutylicum was first re-constructed in …

Opiate and cocaine addictions are major social and medical problems that impose a significant
burden on society. Despite the size and scope of these problems, there are few effective …

Background Tryptophan hydroxylase (TPH) is the rate-limiting enzyme in the synthesis of
serotonin. Low turnover rate of this monoamine neurotransmitter is associated with impaired …

Physical therapists require an accurate, reliable method for measuring muscle strength. They
often use manual muscle testing or hand-held dynametric muscle testing (DMT), but few …

Oilseed crops are grown throughout the semiarid region of the northern Great Plains of
North America for use as vegetable and industrial oils, spices, and birdfeed. In a region …

The findings of a series of studies by the authors support the idea that most impulsive
offenders who have a tendency to behave aggressively while intoxicated have a low brain …

The crop water stress index (CWSI) is a valuable tool for monitoring and quantifying water
stress as well as for irrigation scheduling. This study was conducted during the 1990 and 1991 …

Background and Purpose During the aging process, older adults may experience a loss of
strength and power, which then may lead to functional limitations and disability. The purpose …