A direct‐current, cold‐atmospheric‐pressure air plasma microjet (PMJ) sustained in a quasi‐steady gas cavity in a liquid medium is used to inactivate Staphylococcus aureus (S. aureus) suspended in the liquid. The temperature and the pH value of the liquid change to steady‐state values of about 40 °C and 3.0–4.5, respectively, after 10 min of plasma treatment. The decrease in the pH is attributed to the reaction of NOx produced in the air plasma with water at the gas–liquid interface. The concentrations of NO and NO are measured to be 37 mg · L−1 and 21 mg · L−1, respectively, after a 20 min of plasma treatment. Effective inactivation of S. aureus is found to start after the pH values decreases to about 4.5. This is attributed to the high oxidizing potential of the perhydroxyl radical (HOO•) on the fatty acid in the cell membranes of the microorganisms in the liquid.
A microhollow cathode based, direct-current, atmospheric pressure, (2%) cold plasma microjet was used to inactive antifungal resistants Candida albicans, Candida krusei, and Candida glabrata in air and in water. Effective inactivation was achieved in 10 min in air and 1 min in water. Antifungal susceptibility tests showed drastic reduction of the minimum inhibitory concentration after plasma treatment. The inactivation was attributed to the reactive oxygen species generated in plasma or in water. Hydroxyl and singlet molecular oxygen radicals were detected in plasma-water system by electron spin resonance spectroscopy. This approach proposed a promising clinical dermatology therapy.
Introduction
Complete sterilization of an infected root canal is an important challenge in endodontic treatment. Traditional methods often cannot achieve high-efficiency sterilization because of the complexity of the root canal system. The objective of the study was to investigate in vitro the feasibility of using a cold plasma treatment of a root canal infected with Enterococcus faecalis biofilms.
Methods
Seventy single-root teeth infected with E. faecalis biofilms were divided into 7 groups. Group 1 served as the negative control group (no treatment), and group 7 was the positive control group with teeth treated with calcium hydroxide intracanal medication for 7 days. Groups 2 to 6 included teeth treated by cold plasma for 2, 4, 6, 8, and 10 minutes, respectively. The disinfection of the E. faecalis biofilm was evaluated by colony-forming unit (CFU) counting. Scanning electron microscopy was used to evaluate the structural …
The study of interpersonal communication is gaining importance in this current climate of globalization. Students need to develop interpersonal communication skills because they are very important through all aspects of living. Because of this increasingly multicultural environment, cross cultural communication and interpersonal communication skills are very important and must be developed while studying in a foreign country. Over the years, the number of immigrant students attending schools in the United States has increased dramatically. Interpersonal communication is at the centre of human central relationships and psychoanalysis (Amaraju, 2012). Therefore, the number of challenges in school for foreign students increases as a result of the lack of interpersonal communication skills. The importance of interpersonal communication skills and the development of satisfactory relationships with other students is necessary to understand such behaviors in college students and their effect on academic performance. The proposed study will discuss the possible components that might affect the academic performance of immigrant college students and the interpersonal communication skills that might affect a college education experience as a result. The study will also cover the scope of grammar and speaking limitations among members of the immigrant student community, as well as the effect of their seclusion from the mainstream on their academic performance. This proposal includes my methods for gathering information, and the possible challenges to immigrant students in the classroom including bullying and discrimination.