Sediment cores were collected to investigate multiple stresses on Clear Lake, California, USA, through the period of European occupation to the present day. Earlier workers suggested the hypothesis that the use of mechanized earthmoving equipment, starting in the 1920s and 1930s, was responsible for erosion, mercury (Hg) contamination, and habitat loss stresses. Cores (approximately 2.5 m in de...

Abstract Mineral and hydrocarbon exploration relies heavily on geological geotechnical information extracted from drill cores. Traditional drill-core characterization is based purely the subjective expertise of a geologist. New technologies can provide automatic mineral analysis high-resolution core images in non-destructive manner. However, automated rock mass presents significant challenge du...

introduction: prefabricated metal and ceramic posts can be used with different kinds of core materials as an alternative to the conventional casting post and cores. it is unclear how these post and core systems can withstand different kind of forces in the mouth. the purpose of this study was to compare the fracture strength of endodontically treated, crowned maxillary incisors restored with ca...

The aim of the study was to determine the fate of demineralized freeze-dried bone allograft (DFDBA) used in conjunction with a barrier membrane in the management of extraction sockets and deficient alveolar ridges, and to compare the amount of bone formed with that found in untreated sites. Ten biopsies were obtained from 8 grafted patients. Five biopsies were harvested from untreated sites dur...

HYPOTHESIS Poly(methyl methacrylate) (PMMA) latexes in nonpolar solvents are an excellent model system to understand phenomena in low dielectric media, and understanding their internal structure is critical to characterizing their performance in both fundamental studies of colloidal interactions and in potential industrial applications. Both the PMMA cores and the poly(12-hydroxystearic acid) (...

Mammalian reoviruses, prototype members of the Reoviridae family of nonenveloped double-stranded RNA viruses, use at least three proteins--sigma1, mu1, and sigma3--to enter host cells. sigma1, a major determinant of cell tropism, mediates viral attachment to cellular receptors. Studies of sigma1 functions in reovirus entry have been restricted by the lack of methodologies to produce infectious ...

The origin of the microbial community in a coastal marine sediment was investigated by examining the physical, chemical, and microbial characteristics of the sedimenting particles in Halifax Harbor, Canada. Particles were collected using particle interceptor traps placed on the sediment surface. The measured rate of particle accumulation compared to the sediment accumulation rate indicates that...

Human nuclear cataract formation is a multi-factorial disease with contributions to light scattering from many cellular sources that change their scattering properties over decades. The aging process produces aggregation of cytoplasmic crystallin proteins, which alters the protein packing and texture of the cytoplasm. Previous studies of the cytoplasmic texture quantified increases in density f...

Core proteins VP7 and VP3 have been localized in bluetongue virus (BTV) and BTV-infected cells by immunoelectron microscopy. Gold-labelled monoclonal antibodies to VP7 gave intense labelling with purified BTV core particles and weaker labelling with both directly visualized viral particles, which require no purification, and purified virus particles. It is believed that VP7 is, in a small numbe...

The adsorption and inhibitory action of pyocin 21 on sensitive cells of Pseudonzonas aeruginosa (P. pyocyanea) were observed by fluorescence microscopy and by using agar cultures. By electron microscopy, preparations from four pyocinogenic strains of P. aeruginosa were seen to include contracted and uncontracted particles, isolated tail cores and sheaths, The importance of adsorption and contra...