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Articles 361 - 363 of 363
Full-Text Articles in Life Sciences
A Comparison Of Three Populations Of The Plains Pocket Gophers, Geomys Bursarius Illinoensis, In Illinois, Frank P. Wray
A Comparison Of Three Populations Of The Plains Pocket Gophers, Geomys Bursarius Illinoensis, In Illinois, Frank P. Wray
Masters Theses
Morphometric and karyotypic analyses were performed on three Illinois populations of the Plains Pocket Gopher, Geomys bursarius illinoensis, to determine if any differences were present among the populations. Gophers were collected in three localities: 1) Iroquois and Kankakee Counties (IKC); McLean County (MC); and St. Clair and Madison counties (SMC). All three populations had the same kind and number of chromosomes (2n=72, FN=70). External measurements did not differ significantly among the three populations. Multivariate analysis of variance of the cranial characters showed that a significant (P<.05) difference existed in both males, F(78,1825)=1.65, and females, F(78,1961)=1.63, between the three regions. Duncan's multiple range tests of some cranial measurements showed a clinal increase going from east to west.
Effects Of Methylxanthines On Newborn Rat Respiration, Craig Gatto
Effects Of Methylxanthines On Newborn Rat Respiration, Craig Gatto
Masters Theses
Methylxanthines (MX), such as theophylline, are commonly used in the treatment of recurrent apnea due to their stimulant effects on the respiratory center. Structure-activity studies have demonstrated that substitution of alkyl groups on the 3-position of the xanthine nucleus results in increased bronchodilator potency, while substitution on the 1-position is important for adenosine antagonism and CNS stimulation. Three different alkylxanthines were studied to determine the structural requirements for respiratory stimulation. Respiratory rates and volumes were determined in 4- to 7-day-old rats using a volume displacement body plethysmograph. Measurements were made before and at 5 minute intervals after subcutaneous (s.c.) injection …
Effects Of Intensive Fishing Effort On The Population Structure Of Quahogs, Mercenaria Mercenaria (Linnaeus, 1758), In Narragansett Bay, Michael Rice, Charles Hickox, Itrat Zehra