Antibiotic Growth Stimulation

Antibiotic growth promoters.

Sir, I was dismayed to see that Phillips et al. were defending what nearly all microbiologists know are grave abuses of antibiotics— their continuous use in feed as growth promoters and the needless widespread use of broad spectrum agents (fluoroquinolones). This is despite their acknowledgement that ‘the more an antibiotic is used, the more likely are resistant populations to develop’ and that...

Antibiotic Growth-Promoters in Food Animals

By Peter Hughes and John Heritage, University of Leeds, UK There has been a developing controversy surrounding the use of antibiotics as growth promoters for food animals. These drugs are used at low doses in animal feeds and are considered to improve the quality of the product, with a lower percentage of fat and a higher protein content in the meat. Other benefits of the use of antibiotic grow...

Antibiotic Growth Promoters in animal production

Antibiotic Stimulation of a Bacillus subtilis Migratory Response

Competitive interactions between bacteria reveal physiological adaptations that benefit fitness. Bacillus subtilis is a Gram-positive species with several adaptive mechanisms for competition and environmental stress. Biofilm formation, sporulation, and motility are the outcomes of widespread changes in a population of B. subtilis. These changes emerge from complex, regulated pathways for adapti...

Mammalian cell growth proteins. I. Growth stimulation of fetuin.

In earlier papers we described the presence and properties of a factor in the fetuin fraction of fetal calf serum which promotes growth of mammalian cells in vitro and enhances their stretching on glass and other surfaces.1 Fetuin is an alpha-globulin, obtained by fractional precipitation with ammonium sulfate, whose major component is a glycoprotein of molecular weight 45,000.1 A synthetic med...