Bacterial colonies from Listeria-selective agars were replica plated to sheep blood agar to screen for beta-hemolysis. By using the replica plating method to test for the beta-hemolytic characteristic of all the colonies growing on Listeria-selective agars instead of picking 3 to 10 suspected colonies for further testing, we recovered Listeria monocytogenes from 59 of 142 Listeria-selective aga...

The ability of 258 strains of Staphylococcus aureus and 132 strains of S. epidermidis to produce L-form colonies in a standard environment was investigated. Production of these colonies by S. aureus was correlated with their phage type. Phage type 7 strains produced L-form colonies in larger numbers and more consistently than those of phage type 80/81. No L-form colonies were produced by the S....

Pollinators foraging on monocultures like hybrid lavender are suspected to suffer physiological stress. We used biomarkers assess changes in honeybee physiology pre- and post-hybrid season, high low weight gain colonies. observed post-season increased levels of enzymes involved antioxidant defenses: catalase, superoxide dismutase, glutathione peroxidase; acetylcholinesterase, a biomarker neural...

Long-term effects of Lupinus lepidus on vegetation dynamics at Mount St. Helens by Roger del Moral & Lara Rozzell Abstract: The nitrogen-fixing legume Lupinus lepidus is the most abundant herb on recently formed volcanic surfaces at Mount St. Helen. We compared vegetation structure in 30 Lupinus colonies in three age classes (old, mature, or young based on known years of their establishment) to...

Colonies of Cowdria ruminantium were studied in midgut epithelial cells and salivary gland acini of nymphal Amblyomma hebraeum that were infected experimentally as larvae. Colonies were found in both tissues and studied with light and electron microscopy. Colonies observed within gut cells frequently contained 2 types of the organism: electron-dense and reticulated forms. The morphology of colo...

The formation of chimeric colonies following allogeneic contact between benthic invertebrates may strongly affect colony fitness. Here we show that, in a field population of the colonial ascidian Botryllus schlosseri in Monterey Bay, California, more than 20% of all colonies occur in allogeneic contact with conspecifics. We experimentally assessed the effects of allogeneic contact on the follow...

Susceptibility to the Cry1Ab protoxin and toxin from Bacillus thuringiensis (Berliner) and activity of gut proteinases were assessed in both susceptible and Cry1Ab-selected colonies of European corn borer, Ostrinia nubilalis (Hubner). Resistance in two different selected colonies was at least 6- and 15-fold for the Cry1Ab protoxin and 108- and 484-fold for the Cry1Ab toxin. Activities of trypsi...

Bone marrow cells from a patient with Ph' positive chronic myelogenous leukemia in chronic phase were cultured for multilineage hematopoietic colonies (CFU-GEMMT), erythroid bursts, and granulocytic colonies. With CFU-GEMMT colonies, T lymphocytes were identified by reaction with monoclonal antibodies Leu-5 and OKT-3; B cells were identified by reaction with B1. All CFU-GEMMT colonies examined ...

BACKGROUND Ionizing irradiation of the esophagus results in development of esophagitis. In a mouse model, esophageal progenitor cells, isolated by either the side population (SP) sorting technique or a serial preplate technique, have been demonstrated to repopulate the irradiated esophagus of recipient mice. MATERIALS AND METHODS Esophageal progenitor cells (SP or preplate) as well as bone ma...

Optimality theory predicts the maximization of productivity in social insect colonies, but many inactive workers are found in ant colonies. Indeed, the low short-term productivity of ant colonies is often the consequence of high variation among workers in the threshold to respond to task-related stimuli. Why is such an inefficient strategy among colonies maintained by natural selection? Here, w...