INTRODUCTION Incorporating a feldspar chemical bond between alumina filler particles is expected to increase the wear-resistant and flexural strength properties. AIMS AND OBJECTIVES An investigation was carried out to evaluate the influence of the feldspar chemical bonding between alumina filler particles on wear and flexural strength of experimental alumina/feldspar dental composites. It was...

Increased resistance to the sterilizing effects of apholate was observed in two colonies of Aedes aegypti (L.) exposed in the larval stage of each generation to concentrations of apholate that induced about 90 to 40 percent sterility in the eggs laid by the ensuing adults.

The bacterial spot of tomato, caused by Xanthomonas spp., is a very important disease, especially in the hot and humid periods of the year. The chemical control of the disease has not been very effective for a number of reasons. This study aimed to evaluate, under greenhouse conditions, the efficacy of leaf-spraying chemicals (acibenzolar-S-methyl (ASM) (0.025 g.L(-1)), fluazinam (0.25 g.L(-1))...

Loss-of-function of barley mildew locus o (Mlo) confers durable broad-spectrum penetration resistance to the barley powdery mildew pathogen, Blumeria graminis f. sp. hordei (Bgh). Given the importance of mlo mutants in agriculture, surprisingly few molecular components have been identified to be required for this type of resistance in barley. With the aim to identify novel cellular factors cont...

It has been shown that Smad3 exerts both tumor-suppressive and -promoting roles. To evaluate the role of Smad3 in skin carcinogenesis in vivo, we applied a chemical skin carcinogenesis protocol to Smad3 knockout mice (Smad3(-/-) and Smad3(+/-)) and wild-type littermates (Smad3(+/+)). Smad3(-/-) mice exhibited reduced papilloma formation in comparison with Smad3(+/+) mice and did not develop any...

The classic Solt-Farber model of chemical carcinogenesis in rat liver (7) involves sequential treatment of rats with diethylnitrosamine, partial hepatectomy, and 2(acetylamino)fluorene (AAF). After several weeks, the rats develop multiple preneoplastic hepatic nodules, and some of these become frank hepatocarcinomas after several months. Cells derived from the nodules appear to be resistant to ...

The study of biofilm ecology and interactions might help to improve our understanding of their resistance mechanisms to control strategies. Concerns that the diversity of the biofilm communities can affect disinfection efficacy have led us to examine the effect of two antimicrobial agents on two important spoilage bacteria. Studies were conducted on single and dual species biofilms of Bacillus ...

In this review, we have examined the phenomenon of insulin resistance, a central manifestation of the metabolic syndrome. While it is by no means clear-cut, many new and exciting hypotheses have been proposed to explain this puzzling and enigmatic phenomenon. These studies have also led to a new way of looking at adipose tissue--it is no longer a passive repository of fat. It now actually appea...

The Cornell sample host cavity is a 3.9 GHz testing system for RF analysis of novel superconducting surfaces. The cavity applies fields up to 100 mT on a removable and replaceable 5-inch sample plate in order to measure the surface resistance of the material under investigation. The cavity also includes a temperature-mapping system for localization of quench events and surface defects. In this ...

www.sciencemag.org SCIENCE VOL 333 5 AUGUST 2011 663 COVER A pair of chemical compounds (light blue and purple) target wild-type and mutant forms of the Plasmodium falciparum chloroquine resistance transporter, which mediates the parasite’s (yellow) resistance to the widely used antimalarial drug. Using high-throughput chemical and genetic analyses, Yuan et al. identify potential new antimalari...