Preparation and properties of the mucopeptides of cell walls of gram-negative bacteria.

Selective extraction of polymers from cell walls of gram-positive bacteria.

Brief heating of Bacillus Licheniformis cell walls at 100 degrees C in aqueous buffers of pH3.0-4.0 removes some polymers but not others from the mucopeptides. For example, relatively undegraded teichuronic acid can be extracted at 100 degrees C in 20min at pH3.0 whereas the teichoic acids are not removed. Similar specificity can be shown with walls from three other species of micro-organism.

Preparation and Evaluation of the Physicochemical and Antimicrobial Properties of Biological Nanostructures Polyolactic Acid / Calcium Oxide by Hydrothermal Assisted Microwave Method

Background: Today, with the development of human life and the overwhelming fall of antibiotics and uncontrolled bacterial resistance, the need to find materials with antimicrobial effects is felt more than ever. Nanotechnology has created a new opportunity to investigate the antimicrobial effects of nanomaterials. Materials & Methods: In this study, using hydrothermal and microwave auxiliary c...

Evaluation of Antibacterial Properties of Different Concentrations of Pecanum Harmala Ethanolic Extract on Some Standard Gram-Positive and Gram-Negative Bacteria in Vitro

Introduction: Today, due to the increased drug resistance of bacteria to common antibiotics, it is important to find new antimicrobials with easy access, natural and with fewer side effects. The aim of this study was to investigate the effect of Pecanum harmala ethanolic extract on the activity of some standard bacteria in vitro. Methods and Materials: After collecting the plants and confirmin...

Cell Envelope Structure and Functions in Gram-negative Bacteria

Phytosynthesis of silver nanoparticles with the aqueous extract of portulaca oleracea and its antimicrobial and antioxidant effect against gram-positive and gram-negative bacteria

Background: Due to the importance of investigating nosocomial infections and drug resistance in bacteria causing these infections, the use of herbs can be very helpful in treatment. In the present study, the effect of silver nanoparticles obtained from portulaca oleracea extract on bacteria causing nosocomial infections and effective parameters in the synthesis of these nanoparticles were inves...