We present a detailed analysis of time-resolved optical spectra of the ZZ Ceti white dwarf, HS 0507+0434B. Using the wavelength dependence of observed mode amplitudes, we deduce the spherical degree, l, of the modes, most of which have l = 1. The presence of a large number of combination frequencies (linear sums or differences of the real modes) enabled us not only to test theoretical predictio...

Dispersive liquid-liquid microextraction (DLLME) combined with gas chromatography-mass spectrometry (GC-MS) was used for the extraction and determination of 13 polycyclic aromatic hydrocarbons (PAHs) in mineral water samples. In this procedure, the suitable combination of extraction solvent (500 µL chloroform) and disperser solvent (1000 µL acetone) were quickly injected into the water sample (...

Monitoring of testosterone replacement therapy requires a reliable method for testosterone measurement. Determination of salivary testosterone, which reflects the hormone's biologically active plasma fraction, is a superior technique for this purpose. The aim of the present study was to establish a new sensitive time-resolved fluorescence immunoassay for the accurate measurement of testosterone...

IMPORTANCE Testosterone use in older men is increasing, but its long-term effects on progression of atherosclerosis are unknown. OBJECTIVE To determine the effect of testosterone administration on subclinical atherosclerosis progression in older men with low or low-normal testosterone levels. DESIGN, SETTING, AND PARTICIPANTS Testosterone's Effects on Atherosclerosis Progression in Aging Me...

A simple, rapid and sensitive high-performance liquid chromatographic (HPLC) method for the determination of risperidone in human plasma was developed. An HPLC system based on a Nucleosil C8 column (150?4 mm) and a UV detector (?= 280 nm) were used. A mixture of sodium dihydrogen phosphate buffer-acetonitrile (55:45, v/v) adjusted to pH 6.0 at a flow rate of 1.5 ml min-1 was used as mobile phas...

Background: To determine whether men with varicoceles have lower testosterone levels than those without and to ascertain if testosterone levels increase after varicocelectomy and or to determine whether the varicocele grade is related to the degree of improvement in serum testosterone levels after varicocelectomy and also older age is associated with improvements in testosterone after varicocel...

Thirty-one blood samples were obtained from wild male black bears at different times of the calendar year. The samples were assayed for serum testosterone and the results were correlated with testicular size, time of year and nutritional status. A significant annual testosterone rhythm was found with high values during March through mid-July (mean 153 ng per 100 ml) and low values from mid-July...

PURPOSE Late-onset hypogonadism (LOH) in aging males is a clinical and biochemical syndrome characterized by a decline in serum testosterone levels. LOH results in various physical and mental disabilities. We evaluated the relationship between serum testosterone levels and symptoms of LOH. MATERIALS AND METHODS During an andropause screening program, we examined responses to the Saint Louis u...

OBJECTIVE We have previously shown that hypogonadotrophic hypogonadism is common in middle-aged patients with type 2, but not with type 1, diabetes. We have now investigated the total and free testosterone concentrations in young (aged 18-35 years) type 1 and type 2 diabetic patients. RESEARCH DESIGN AND METHODS In this study carried out in a tertiary referral center, serum concentrations of ...

We have read with immense interest the recent article byWehr et al. (1) showing that low free testosterone concentrations in postmenopausal diabetic women are associated with increased allcause and cardiovascular mortality. We wish to comment on the concentrations of total and free testosterone of the study subjects. The overall mean or median total and free testosterone concentrations were not...