Wichita State University

About: Wichita State University is a education organization based out in Wichita, Kansas, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 4988 authors who have published 9563 publications receiving 253824 citations. The organization is also known as: WSU & Fairmount College.

Dolomitization of Holocene Shallow-Marine Deposits Mediated by Sulfate Reduction and Methanogenesis in Normal-Salinity Seawater, Northern Belize

Abstract: Dolomite constitutes an average of 12% of the Holocene organic-rich sediments over a 15 km2 area of the Cangrejo Shoals mudbank in northern Belize. Although it defines a laterally persistent stratiform body that averages 3 m thick, it is present throughout the 7.6-m-thick sediment section. These transgressive sediments are less than 6400 years old and were deposited in shallow-marine environments of normal salinity. The dolomite is dominantly cement, and average crystal size is 7 m. There are no significant correlations among amount of dolomite vs. sediment texture, mineralogy, porosity, or mole % MgCO3 in associated particulate high-Mg calcite, depth, or location on the shoals. The dolomites are poorly ordered and calcic (39.5-44.5 mole % MgCO3), with low mean Mn (210 ppm) and relatively high mean Sr (1034 ppm) concentrations. There is no evidence of recrystallization or geochemical alteration of the dolomite. 18O values of the dolomites range from 0.5 to 2.8o/ooPDB, and the mean value (2.1o/oo) suggests that the dolomite precipitated from normal-salinity pore water. Dolomite 13C values range from -5.2o/oo to +11.6o/ooPDB (mean seawater 13C = 0.5o/oo), which suggests dolomitization promoted by both bacterial sulfate reduction and methanogenesis in environments with anoxic pore water. Dolomitization attending these organodiagenetic reactions apparently was reversible over time, and episodic rather than continual precipitation is indicated. Requisite Mg and Ca were provided by seawater and by some dissolution of host sediments. The most rapid period of dolomitization may have been during early transgression, when relatively high sedimentation rates sustained high levels of organodiagenesis and pore-water alkalinities.

A comparative analysis of mother-father speech in the naturalistic home environment

Abstract: The purpose of this study was to compare qualitatively and quantitatively the communicative interactions of fathers and mothers with their young child in the naturalistic home environment. Ten couples of similar background served as subjects. Three different settings—(a) mother and child, (b) father and child, and (c) mother and father with child—were arranged and 30-minute tape-recordings were made in the homes with the use of wireless recording equipment. Although differences were found as mothers and fathers interacted alone with their child, the similarities outweighed the differences. When both parents were together with their child, there were even fewer differences. The results indicate that both parents can provide very similar programmable input for the child and that the child acquires languages in a rich and highly varied linguistic environment.

Metric variation in the human occipital bone: forensic anthropological applications.

Abstract: Sex and race variation of the occipital bone have been previously investigated, but particular examination of the effect of age and ancestry on sexual dimorphism has not been addressed. This paper examines morphological variation associated with sex and ancestry in the condylar region of the occipital bone and the effect of age and ancestry on the estimation of sex. Models previously published by Holland (1,2) are also tested, and methodological problems are addressed. The results indicate that age does not have an effect on sexual dimorphism, but that whites exhibit greater, although not significantly, more sexual dimorphism than blacks. Significant sex and ancestry variation is present in the condylar region of the occipital bone, but neither sex nor ancestry could be estimated accurately using measurements of this anatomical region defined by Holland (1,2).