ABSTRACT
This study examined the disinfection conditions (exposure time, 0–30 min; exposure temperature, 4℃–65℃) of hypochlorous acid water (HOCl) in automobile disinfection equipment. The study tested poliovirus type 1 (PV1), low pathogenic avian influenza virus (AIV, H9N2), and foot and mouth disease virus (FMDV, O type). As a result, the PV1 and FMD viruses were inactivated easily (virus titer 4 log value) by HOCl (> 100 ppm) but the AIV required higher exposure temperatures (> 55℃). In conclusion, the exposure temperature and time are important factors in deactivating AIV and FMDV.
Subject(s)
Animals , Automobiles , Disinfection , Foot-and-Mouth Disease Virus , Foot-and-Mouth Disease , Hypochlorous Acid , Influenza in Birds , Poliovirus , WaterABSTRACT
This study examined the disinfection conditions (exposure time, 0–30 min; exposure temperature, 4℃–65℃) of hypochlorous acid water (HOCl) in automobile disinfection equipment. The study tested poliovirus type 1 (PV1), low pathogenic avian influenza virus (AIV, H9N2), and foot and mouth disease virus (FMDV, O type). As a result, the PV1 and FMD viruses were inactivated easily (virus titer 4 log value) by HOCl (> 100 ppm) but the AIV required higher exposure temperatures (> 55℃). In conclusion, the exposure temperature and time are important factors in deactivating AIV and FMDV.
ABSTRACT
The probiotic properties of Enterococcus (E.) faecalis PSCT3-7, a new strain isolated from the intestines of pigs fed dietary fiber containing 50% sawdust, were investigated. E. faecalis PSCT3-7 tolerated a pH range of 3 to 8 and 0.3% bile salts, and it inhibited the growth of Salmonella Typhimurium in a concentration-dependent manner. In addition, E. faecalis showed resistance to several antibacterial agents. Vermiculite, a nutrient and microbial carrier, increased the bile tolerance of the strain. Scanning electron microscope images revealed good adsorption of E. faecalis PSCT3-7 onto vermiculite. E. faecalis PSCT3-7 represents a potential probiotic candidate to administer with vermiculite to swine.
Subject(s)
Adsorption , Anti-Bacterial Agents , Bile , Bile Acids and Salts , Dietary Fiber , Enterococcus faecalis , Enterococcus , Hydrogen-Ion Concentration , Intestines , Probiotics , Salmonella typhimurium , SwineABSTRACT
This study was performed to investigate the antibacterial, antioxidant, and termite repellent effects of citronella oil (CiO) and lemongrass oil (LO). When the antibacterial activity against Staphylococcus (S.) aureus with various levels of antibacterial resistance were tested, a 0.05% concentration of CiO and LO completely inhibited the growth of all tested S. aureus strains. Evaluation of the antioxidant effect demonstrated that the 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity of CiO was 2~3 times greater than that of LO. Among trial products made with various combinations of CiO and LO, a CiO : LO ratio of 6 : 4 had the most potent termite repellent effects. Assessment of acute toxicity of the trial product showed that the LD50 was more than 2,000 mg/kg. Based on the above results, CiO and LO have antibacterial, antioxidant, and termite repellent activities. Therefore, both compounds could be potential termites repellent reagents.
Subject(s)
Antioxidants , Cymbopogon , Indicators and Reagents , Isoptera , Lethal Dose 50 , StaphylococcusABSTRACT
BACKGREOUND: Mass casualties from organophosphrous inhalation die from respiratory depression. Gas supplies and equipment are limited for mechanical ventilation of multiple subjects. Endobronchial insufflation of air (EIA) requires only a compresssor and airway catheters. We examined clinical usefulness of EIA in a model of apnea produced by tetrodotoxin (TTX) infusion. METHODS: Five anesthetized dogs were applied the conventional mechanical ventilation (CMV) while 12 mcg/kg TTX was infused IV over 90 min to produce apnea. EIA at 1 L/kg/min was delivered through a 35 cm long 0.8 cm I.D. catheter with a forked end placed astride the carina. Measurements of cardiovascular and respiratory function were made after TTX (time=0) on CMV, and then serially for 4 hours of EIA. RESULTS: All dogs survived through 4 hours study. PaO2 decreased significantly within 30 min and then slowly increased significantly after 60 min. PaCO2 increased significantly within 30 min and decreased significantly after 60 min. HR increased significantly after 20 min and MAP increased significantly after 60 min. Mean SD of PaO2, PaCO2, pHa, SaO2, cardiac output, mean pulmonary pressure, mean arterial pressure, systemic vascular resistance, central venous pressure and Qs/Qt are shown in table. Spontaneous respiratory efforts slowly returned after 45 min of EIA and resulted in the improvement of gas exchange. CONCLUSION: EIA is a field ventilatory technique useful when other equipment may not be available. The airway catheter can be placed by cricothyroidotomy. EIA supports life and produces normal survivors in apneic dogs.