Prerna Gupta

Studies on PVA/AgI Based Polymeric Membranes for Exploration of Antibacterial Activity

ABSTRACT In the present communication, solid polymer electrolyte films have been prepared using solution cast technique based on polyvinyl alcohol (PVA) as host polymer and silver iodide (AgI) as salt. The objective of the study is to develop PVA electrolytic films with AgI and evaluate to protect against simulants of biological warfare agents. The antibacterial activities of the films are explored against Aeromonas hydrophila, Escherichia coli, Salmonella typhii, and Shigella boydii. The antibacterial effects of the PVA/Ag+ hybrids were assessed by the minimum inhibitory concentration method. Polymer electrolyte films show good antibacterial activity against A. hydrophilla, S. typhii, and S. boydii. Scanning electron microscopy is used to study the surface morphology of the polymeric membranes. Complex impedance spectroscopy is used for characterizing the electrical and dielectric properties of the electrolyte samples. Frequency-dependent various dielectric properties such as dielectric constant, dielectric loss, and loss tangent have been discussed. The variations of AC conductivity gives the explanation in understanding the mechanism of the ion transport and determine power exponent value n lying in the range 1 and 1.2 which represents the trapping of ions in the polymer matrix. GRAPHICAL ABSTRACT

Study of foramen tympanicum with its clinical implications in North Indian Crania

Introduction: The foramen tympanicum also known as foramen Huschke is present in the anteroinferior wall of external auditory canal after 5 years of age. It has anatomical significance and in adult life it can be involved in different abnormalities of external auditory canal and various Otological complications ranging from salivary otorrhoea to temporomandibular joint herniation. Methods: The current study was done on 100 dry adult north Indian crania to study the incidence, sex, sides and shape of foramen tympanicum. Results: Out of 100 skulls studied foramen tympanicum was observed in 18 skulls (26 sides). The incidence of foramen tympanicum was found in 13% skulls and it was more in females as compared to males. The most common shape of foramen was found to be irregular. Conclusions: The ENT as well as maxillofacial surgeons should be aware of persistent foramen tympanicum and should be careful while performing endoscopy of temporomandibular joint to prevent its accidental damage.