11 research outputs found
Effects of Metal Ions on Conductivity and Structure of Single DNA Molecule in Different Environmental Conditions
Determination of the DNA helical repeat and of the structure of supercoiled DNA by cryo-electron microscopy.
Micellar Properties for Propoxylated Surfactants in Water/Alcohol Solvent Mixtures and Their Antibacterial and Polyester Fabric Antistatic Performances
Two propoxylated quaternary amine surfactants characterized by two and six average POadduct numbers (PO-2 and PO-6 QA surfactants) were synthesized to investigate
the micellar properties of propoxylated cationic surfactants in water/alcohol mixtures. The effect of PPO groups on micelle formation was explored using conductivity, UV–vis spectroscopy, dynamic light scattering techniques. Regular or reverse micellization occur with water or alcohol rich solvent mixtures, respectively. For intermediate composition no
micellization occurs. Also the performances in antibacterial and antistatic fabrics were studied. PO-2 QA surfactant has excellent antibacterial activities against both the Gram-negative bacterium Escherichia coli and the Gram-positive bacterium Staphylococcus aureus while both surfactants have good antistatic activity over polyester fabric