Sorghum plants excrete phenolic acids which reduce subsequent crop yields. These acids accumulate in field soil by combining with soil and clay particles to form stable complexes which remain until degraded by bacterial metabolism. The amount of phenolic acids in soil samples were obtained by gas chromatography measurements, while Azotobacter populations were obtained by plate counts in 40 sorghum field samples from Denton County, Texas. One can conclude that increasing the Azotobacter population in the soil increased the degradation rate of phenolic acids proportionally. It is proposed that seed inoculation will introduce selected strains of Azotobacter into the soil. The presence of Azotobacter should increase crop size in subsequent plantings.

The present study attempted to identify demographic and psychological variables predictive of adolescent suicidal ideations and attempts. Data from 90 adolescents, who completed an intake form at a university community mental health clinic or were student volunteers, were utilized. Two judges tabulated information regarding age, gender, number of siblings, ethnicity, parental marital status, drug use, depression, suicidal ideation, and previous suicidal attempts. A multiple regression analysis was performed to identify which variables had predictive significance. Depression was the best predictor of both suicidal ideations and attempts. Ethnicity was also predictive; white adolescents were found to be at higher risk for suicide than individuals from other ethnic groups. It is suggested that additional studies be done exploring other predictors of suicide among adolescents.

The present investigation was designed to examine the effects of the positive manipulation of information on self-efficacy and subsequent performance of 180 female subjects. High, moderate, and low self-efficacy subjects were randomly assigned to a treatment condition in a 3 x 4 x 3 (preexisting self-efficacy x efficacy information source x trials) factorial design. Information from the three efficacy sources of performance accomplishments, verbal persuasion, and vicarious experience was manipulated towards success after subjects completed a muscular leg endurance task. The results supported self-efficacy theory with high self-efficacy subjects extending their legs significantly longer than moderate and low self-efficacy subjects. However, subjects did not differentially [sic] respond to the manipulation of the efficacy information. Results are discussed in terms of efficacy as a mediator of performance on an endurance task as well as the lack of differential changes in efficacy based on the source from which that information is derived.