The physiological effects of the pineal gland on the prolactin cells of the adenohypophysis were examined in short photoperiod-exposed male hamsters, as well as in blinded male and female hamsters. Pituitary storage of prolactin was assessed by monitoring radioimmunoassayable pr…
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This investigation was primarily concerned with the interaction of the ('125)I-labeled human gonadotropins with testicular tissue from the human and from nonhuman primate species. The binding of the ('125)I-hFSH and ('125)I-hCG (or ('125)I-hLH) to a particulate fraction (P1) of …
Two experiments were performed with live turkeys to investigate the nature of adaptive bone remodeling, i.e., the relationship between bone strains and bone morphology. Three birds were trained to hop on one leg during short sessions while otherwise walking normally; the exercis…
To determine the effects of altered respiratory system mechanics on speech production, we compared aerodynamic and acoustic data generated during sustained utterances by nine male chronic obstructive pulmonary disease patients with similar data from nine male age-matched normal …
The present study was predicated on the hypothesis that retinoids (analogues of vitamin A) have a direct effect on human female reproductive tract epithelia and that they modulate the effects of estradiol (E\sb2) and progesterone (P) on these tissues. To study retinoid and stero…
Two myosin heavy chain (MHC) isoforms, SM1 (204 kDa) and SM2 (200 kDa), have been identified in smooth muscle. How these two smooth muscle isoforms differ functionally is not known. It is well known that isoforms of myosin from striated muscle are functionally different. We demo…
The purpose of these studies was to determine whether the inhibitory effects of short photoperiod exposure on prolactin cell activity in male Syrian hamsters and/or the inhibitory effects of melatonin treatment on the growth and activity of diethylstilbestrol- (DES) induced prol…
Pectinesterase and polygalacturonase were detected in induced salivary secretions of the greenbugs, Schizaphis graminum (Rondani). The method involved construction of agarose-pectin gel plate on which the aphids were allowed to feed through Parafilm, followed by ruthenium red st…
In the present investigation the semen parameters, reproductive hormonal values, and sex-role identity were evaluated quantitatively in 10 men with idiopathic oligospermia over an 18 week period. The subjects, ages 26-42, were randomly assigned to placebo or treatment groups. Af…
Reports of hybridization between Macaca tonkeana and Macaca hecki (Primates: Cercopithecidae) were investigated in Central Sulawesi, Indonesia from November 1989-November 1991. Hybridization as defined by morphology was detected in the area of the road from Tawaeli to Toboli tha…
Cortisol and β-endorphin have been shown to inhibit secretion of estradiol and luteinizing hormone. A decrease in luteinizing hormone and estradiol could cause infertility in mares. Experiments were performed to determine if increased intensity of reproductive management before …
Repeated exposure to addictive drugs produces neurochemical and structural adaptations in mesolimbic dopamine neurons. It is known that natural motivated behaviors (e.g. feeding, mating) also activate the mesolimbic dopamine pathway. Before the mechanisms underlying drug addicti…
Reproduction is an energetically expensive process that can be postponed under adverse metabolic conditions in an attempt to conserve energy for processes more vital to the immediate survival of the individual. The sensory receptors and afferent signaling methods involved, have …
Contraction in striated muscle is regulated by Ca+2 through the tropomyosin (Tm)-troponin (Tn) thin filament associated regulatory complex. The Tn complex is composed of three subunits: troponin C (TnC), troponin I (TnI), and troponin T (TnT). Troponin T has been proposed as a m…
The regulation of intestinal calcium transport is a subject of continuing controversy. Most investigations on this subject have involved use of the laboratory rat or layer-type chicken. The research reported in this thesis was conducted in 0- to 21-d-old rapidly growing broiler …
Architecture and flow variables affecting oxygen delivery were measured in cremaster muscle capillary networks of anesthetized (pentobarbital sodium, 70 mg/kg, i.p.) Syrian hamsters (HSD:SYR). Networks consist of capillary sub-groups, modules. In juvenile (51 days) and adult (79…
Eighteen Quarter Horse (Experiment 1)and 17 Arabian (Experiment 2) weanlings were used to determine the influence of housing on third metacarpal bone mass. In Experiment 1, weanlings were separated into paddock (P1, n = 6), stall (S1, n = 6), or exercised groups (X1, n = 6). Exp…
The purpose of this study was to determine the relationships between age, physical activity patterns, estrogen levels, estrogen supplement and central circulatory responses of postmenopausal women to acute submaximal exercise. In addition, the relative influence of these four va…
Studies were designed to investigate the biochemical mechanism and hormonal regulation of dilatation of the uterine cervix at parturition. The suitability of the guinea pig animal model was established by demonstrating collagenolysis in the uterine cervix similar to the changes …