Discrete Hartley transform (DHT) is known to outperform fast Fourier transform (FFT) on sequential machines. Here we investigate parallel algorithms and implementations of twoand three-dimensional DHT in order to determine if the advantage of Hartley transforms over Fourier transforms carries over to parallel environment as well. Our extensive empirical study of the performances of DHT and FFT ...

Introduction: The discrete Hartley transform (DHT) is an attractive alternative to the discrete Fourier transform (DFT) because of its real-valued computation and properties similar to those of the DFT [1]. Another interesting property of the DHT is that the same kernel is used for both the transform and its inverse transform. Consequently, since its introduction the DHT has found its way to ma...

No significant effective therapy has been established for patients with idiopathic male infertility up to now. In order to assess the role of androgens in idiopathic male infertility, testosterone (T) and 5 alpha-dihydrotestosterone (DHT) levels in isolated seminiferous tubules (intratubular levels) were measured by radioimmunoassay (RIA) in 100 patients with idiopathic male infertility. RIA of...

The effect of an androgenic metabolite of testosterone, dihydrotestosterone (DHT), on reproductive behavior and brain androgen receptor (AR) immunoreactivity was compared in juvenile and adult male Syrian hamsters. Prepubertal and adult animals were castrated and treated with 0, 500, or 1000 microg of DHT daily for 1 week and then tested for their ability to engage in mating behavior. The 1000-...

Growing evidences support that androgen displays beneficial effects on cardiovascular functions although the mechanism of androgen actions remains to be elucidated. Modulation of endothelial cell growth and function is a potential mechanism of androgen actions. We demonstrated in the present study that androgens [dihydrotestosterone (DHT) and testosterone], but not 17β-estradiol, produced a tim...

The epididymis is an androgen-dependent organ. The hormones regulate the morphology and secretory activity of the epididymal epithelial cells. The cells in vitro resume their function as in vivo and also reveal features of steroidogenic cells. It can be expected that, as with Leydig cells, the morphology and function of the cells can be regulated by LH/hCG. The aim of the study was to assess th...

OBJECTIVE Castration of male apolipoprotein E-deficient (apoE-/-) mice reduces angiotensin II (Ang II)-induced abdominal aorta aneurysms (AAAs) to that of female mice. The purpose of this study was to determine whether this reduction is attributable to androgen-mediated regulation of aortic Ang II type 1A receptors (AT1aR). METHODS AND RESULTS AT1aR mRNA abundance in the AAA-prone region of a...

Amyotrophic lateral sclerosis (ALS) is a lethal disease characterized by a progressive loss of motoneurons. The clinical symptoms include skeletal muscle weakness and atrophy, which impairs motor performance and eventually leads to respiratory failure. We tested whether dihydrotestosterone (DHT), which has both anabolic effects on muscle and neuroprotective effects on axons and motoneurons, can...

The mechanical properties of tissue engineering scaffolds are critical for preserving the structural integrity and functionality during both in vivo implantation and long-term performance. In addition, the mechanical and structural properties of the scaffold can direct cellular activity within a tissue-engineered construct. In this context, the aim of this study was to investigate the effects o...

Rat pituitary, hypothalamic and cerebral cortical minces are demonstrated to effect the conversion of testosterone (T) to 5~-androstan-17~-ol-3-one (DHT) and A 4androstene-3,17-dione (A4A). The pituitary effected the greatest conversion of T to both DHT and A4A. The hypothalamus converted more T to DHT than did the cerebral cortex; but the conversion of T to ~4A in these two tissues occured to ...