University of Kentucky

About: University of Kentucky is a education organization based out in Lexington, Kentucky, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 43933 authors who have published 92195 publications receiving 3256087 citations. The organization is also known as: UK.

Peripheral Vision The Sites of Organizations

Abstract: This essay introduces a new form of social ontology and sketches its bearings on the analysis of organizations. The essay begins by contrasting the two social ontological camps — individualism and societism — into which social theory has been divided since its inception. It then describes the new approach, called site ontology, according to which social life is tied to a context (site) of which it is inherently a part. Examples of such ontologies are presented, as is my own thesis that the site of social life is composed of a nexus of human practices and material arrangements. The bearing of the latter ontology on the character, origin, and perpetuation of organizations is then considered, using an academic department as an example. Contrasts are also drawn with various approaches in organizations theory, including rational organizations, neoinstitutionalism, systems theories, and selection theories. A final section considers the complex psychological structure of organizations, working off Karl Weick and...

Fischer–Tropsch synthesis: support, loading, and promoter effects on the reducibility of cobalt catalysts

Abstract: Temperature programmed reduction (TPR) and hydrogen chemisorption combined with reoxidation measurements were used to define the reducibility of supported cobalt catalysts. Different supports (e.g. Al2O3, TiO2, SiO2, and ZrO2 modified SiO2 or Al2O3) and a variety of promoters, including noble metals and metal cations, were examined. Significant support interactions on the reduction of cobalt oxide species were observed in the order Al2O3>TiO2>SiO2. Addition of Ru and Pt exhibited a similar catalytic effect by decreasing the reduction temperature of cobalt oxide species, and for Co species where a significant surface interaction with the support was present, while Re impacted mainly the reduction of Co species interacting with the support. For catalysts reduced at the same temperature, a slight decrease in cluster size was observed in H2 chemisorption/pulse reoxidation with noble metal promotion, indicating that the promoter aided in reducing smaller Co species that interacted with the support. On the other hand, addition of non-reducible metal oxides such as B, La, Zr, and K was found to cause the reduction temperature of Co species to shift to higher temperatures, resulting in a decrease in the percentage reduction. For both Al2O3 and SiO2, modifying the support with Zr was found to enhance the dispersion. Increasing the cobalt loading, and therefore the average Co cluster size, resulted in improvements to the percentage reduction. Finally, a slurry phase impregnation method led to improvements in the reduction profile of Co/Al2O3.

Evolutionary consequences of indirect genetic effects

Abstract: Indirect genetic effects (IGEs) are environmental influences on the phenotype of one individual that are due to the expression of genes in a different, conspecific, individual. Historically, work has focused on the influence of parents on offspring but recent advances have extended this perspective to interactions among other relatives and even unrelated individuals. IGEs lead to complicated pathways of inheritance, where environmental sources of variation can be transmitted across generations and therefore contribute to evolutionary change. The existence of IGEs alters the genotype-phenotype relationship, changing the evolutionary process in some dramatic and non-intuitive ways.

Promoter (FLt) for the full-length transcript of peanut chlorotic streak caulimovirus (PCLSV) and expression of chimeric genes in plants

Abstract: The isolation, modification and use of wild-type and modified viral FLt promoters of peanut chlorotic streak caulimovirus (PClSV) in the expression of chimeric genes in plant cells. The FLt promoter from PClSV has been modified to have duplicated enhancer domains.