The uptake, retention, and distribution of ⁶⁰Co, ⁶⁵Zn, ⁸⁵ Sr, and ¹³¹I was examined in the Rough-Skinned Newt (Taricha granulosa). Each of these radionuclides is a possible contaminant of the freshwater environment and, thus, is of importance in radioecology. The newts were maintained singly at 10° C in an unfed...
The pulmonary function scores of 250 male cigarette smokers
were compared with 406 lifetime nonsmokers. A Stead-Wells spirometer
was used to obtain forced vital capacity, forced expiratory
flow, forced mid-expiratory flow, and forced expiratory volume. All
individuals included in the sample were between. the ages of 20 and
49 years....
Bioelectric responses from the isolated eye of the purple shore
crab were measured by the electroretinogram with stimulation by
light from wavelengths of 250 to 800 nm, strontium-yttrium-90 beta
radiation, 17.5 keV x-radiation, and 3-cm microwaves.
Peak sensitivities to light stimulation were found at 350 and 500
nm. These peaks...
This experiment was designed to investigate the in vivo effects of calcium ions on tetracycline absorption when oral doses of tetracycline and calcium-containing medications were administered concurrently. Twenty-one human volunteers were selected and divided into three equal-sized groups: Group A, Group B, and Group C. Each volunteer in Group A...
The effect of concentration, vehicle and surfactant on the
absorption of benzocaine -³H across the rat's rectal mucosa was
investigated. Blood radioactivity levels were determined after the
application of benzociane -³H containing suppositories and ointments.
A wet oxidation method was used for sample digestion. Since the
radioactivity counted is the...
Tissue distribution studies of calcium and lead in brain tissue
of rats were increased subsequent to a single intravenous injection
of lead, 10 mg/kg, in the form of lead acetate. Time-course
studies demonstrated that brain concentrations of calcium and lead
(in terms of wet tissue weight) were found to be...
Injection of a 2.0 mg Cd
²⁺
/kg B.W. (I.P. as CdC1
₂
in
.05 M NaAc, pH = 6.9-7.2, .15 M or p = .15 with NaCl) resulted
in a decrease in ceruloplasmin (EC 1.12.3) p-phenylenediamine
oxidase activity within one hour of injection.
Maximal decrease (40%) occurred within six...
Forced vital capacity lung expiration examinations of nonsmoking
and cigarette-smoking male sample populations were compared to
determine if the 75 to 85 percent segment was a more sensitive test
of early lung dysfunction. The nonsmoking population was composed
of 240 men who were tested for values of forced vital capacity...