Showing papers by "Nova Southeastern University published in 1975"

Validity of radiocarbon dates on ground water

Abstract: Carbonate species, dissolved in appreciable quantities in all ground waters, can be extracted and used for radiocarbon dating. The material is mainly of biogenic origin, but contains some bicarbonate produced from limestone. This causes a dilution of the radiocarbon activity of the total carbonate species in the water and a correction is necessary in order to determine absolute radiocarbon ages, i.e., the time since the waters went underground.

Factor analytic study of the revised illinois test of psycholinguistic abilities (itpa)

Abstract: In a review of the factor analytic work on the ITPA, Sedlach and Weener (1973) suggested that future studies use subpopulations of different abilities. The results presented here are offered as additional evidence that the Revised ITPA does not contain 10 independent subtests as originally hypothesized. The special subpopulation consisted of 102 children in a private school for children with learning disabilities but average intelligence and ranging in age from 5 to 10:3 for whom scores were available. Intercorrelarions among raw scores of the 10 ITPA subtests were factor analyzed. The two supplementary subtests were not included. Factors selected for varimax rotation were based on standard criteria presented by Guertin and Bailey (1970). Table 1 presents the factors after rotation, the row sum of the squared loadings and the multiple squared correlations (R') used as comrnunaliry estimates. Seven factors resulted from the principal axis solution. Four of the seven principal axes with lacenr roots of .33 were rotated to approximate simple structure using Kaiser's varirnax criterion.

Potentiation of antineoplastic compounds by oral dimethyl sulfoxide in tumor‐bearing rats*

Abstract: Although dimethyl sulfoxide (DMSO) has been known for over 100 years, it is only in the last decade that its capacity for rapid water substitution has been investigated with pharmacological agents in mammals.' A wide variety of analgesics, administered in or with DMSO, were found to be transported across cellular and vascular membranes at an accelerated rate, and often with enhanced effectiveness.2 However, a flood of frequently uncritical studies, combined with observations of toxic damage when large doses were administered to dogs and rabbits,3 led the Food and Drug Administration to suspend clinical research on DMSO temporarily from 1965 to 1967. This action had a salutary effect, and more deliberate and thorough research continues to indicate that DMSO may uniquely modify a variety of physiological, metabolic, and immunological responses when parenteral or oral administration results in sustained blood and tissue levels.2 Its weak ability to act as an H+ donor, and thus not to participate in reactions that favor alkylation, led us to investigate the capacity of DMSO to potentiate the antineoplastic effects of cyclophosphamide (CTX), an alkylating derivative of nitrogen mustard. The rodent tumor selected for these studies (INRL-1871) responds to several antineoplastic drugs, such as chlorambucil, 6-mercaptopurine, 5-fluorouracil, and amethopterin. Tumor development is consistent. A predictable, fatal leukemia follows i.p. inoculation; a solid nonmetastatic lymphosarcoma results from subcutaneous deposition of malignant The antigenicity of NRL-187 1 appears to be quite weak. We have investigated the therapeutic effect of parenteral and oral CTX in rats that are ingesting DMSO.

Parent Consulting: Developing Power Bases and Helping People.

Abstract: School counselors can create power bases and have a significant impact upon the surrounding community through work with parents. A three-step program is presented along with supplemental practical activities for consultants to use in working with parents.

A Comprehensive Time Series Model for Studying the Effects Reservoir Management on Fish Populations

Abstract: We describe a linear modeling technique that derives functions (parameters) of the predictor variables in a tabular form using a Fourier transformation technique. The result is a complex multiple regression model that is actually a series of models independently describing each parameter. This technique (1) provides an approximation to nonlinear modeling that is not restricted to a small number of variables, (2) does not require precisely formulated theoretical functions for each variable, and (3) avoids many of the restricting assumptions normally required for nonlinear modeling. The estimate of the total systematic information (variance) in the system and the amount of information predicted by the model can be used as a measure of the efficacy of the model. A production form of the model is being completed for use on the Missouri River mainstem reservoir system for predicting the effects of reservoir management practices on the indigenous fish populations.