Essential oil composition, insecticidal and antibacterial activities of Salvia tomentosa Miller

WOS: 000313711700030The effectiveness of the essential oil of Salvia tomentosa Miller was assessed on two important pest insects and seven pathogenic bacteria. The essential oil of aerial parts of this plant was hydro-distillated using a clevenger-type apparatus (yield 0.31 % v/w) and constituents were determined using GC-MS analysis. beta-pinene (37.28 %) and alpha-pinene (5.73 %) were the predominant chemical constituents, followed by trans-pinocarveol (3.05 %), myrtenol (2.81 %), caryphyllene oxide (2.68 %), d-camphor (2.08 %). The complete mortality was determined at above doses of 50 mu l L-1 air on Acanthoscelides obtectus (Say) adults. However, the essential oil in concern caused 83.34 and 100 % mortality at higher doses (150 and 200 mu l L-1 air) against Tribolium castaneum (Herbst) adults. The essential oil also revealed significant bacteriostatic and bactericidal activities against Staphylococcus aureus, Bacillus subtilis, Bacillus cereus, Micrococcus luteus, Escherichia coli, Enterobacter aerogenes and Yersinia enterocolitica. The essential oil of S. tomentosa in concern can be used as a potential insecticide and bactericidal agents in food applications and agricultural commodities and/or other fields.University of Osmaniye Korkut Ata, Scientific Research Project (OKU-BAP, Osmaniye, Turkey)Osmaniye Korkut Ata UniversityThis study was partially supported by the University of Osmaniye Korkut Ata, Scientific Research Project (OKU-BAP, Osmaniye, Turkey). Authors want to thank to Assoc. Prof. Abdurrahman Ayvaz for donating the insect culture and providing a place for the experimental studies in his lab

Oral colonization and boric acid susceptibility of yeast in boron mineral workers

In this study, we aimed to investigate the effects of boron on in vivo oral yeast colonization in study groups which are exposed to boron dust in different sections of the boron mine. The study was carried out in the boron mining areas of two districts (Eskisehir and Balikesir) of Turkey. We included 184 people working in open quarry and stone milling unit, 144 people working in the factory and 150 people as control group. Specimens were taken from four oral mucosal regions and cultured onto Sabouraud dextrose agar. After incubation for 3-7 days at 30 degrees C, the total number of yeast colonies on the plates was considered the relative intensity of carriage, and the total number of yeast colonies on the plates was considered the relative intensity of oral carriage. The susceptibility of Candida spp. to boric acid was investigated. The frequency of Candida colonization in boron intensive area workers was found significantly higher than automatic factory workers and control groups (p = 0.012), there were no difference between automatic factory workers and control groups in point of Candida colonization (p = 0.749). We observed that oral yeast colonization had increased directly proportional with boron powder exposure in boron mine (p = 0.005). Mean minimum inhibitory concentrations (MICs) of boric acid for Boron intensive area, 0.87-2.0% for automatic factory and 0.83-2.0% for control subjects. We observed that intensive exposure to boron mineral powders was strictly related to oral yeast colonization. Exposure to industrial boron mineral powder may cause important health problems by increasing Candida colonization in oral cavity. It may be useful to do periodical health control in boron mineral workers and population under risk