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Title: Commercial-grade hydrogen peroxide is an effective disinfectant at room temperature after how many ... Post by: yadwinder on Feb 25, 2018 Commercial-grade hydrogen peroxide is an effective disinfectant at room temperature after how many minutes?
a. 5 c. 30 b. 10 d. 60 Q. 2 Which of the following should routinely be used to ensure proper function and quality control of an autoclave? 1. Pressure-sensitive tape 2. Biologic indicators 3. Chemical indicators 4. Heat-sensitive tape a. 2 c. 1, 2, and 3 b. 2 and 4 d. 1, 2, and 4 Q. 3 At high altitudes, sterilization by boiling must be prolonged primarily because of which of the following? a. Increased oxygen content c. Increased normal boiling point b. Reduced oxygen content d. Reduced normal boiling point Q. 4 Dry-heat sterilization involves a 1-hour to 2-hour exposure at approximately: a. 100 C. c. 170 C. b. 132 C. d. 200 C. Q. 5 Which of the following physical properties are required for an autoclave to sterilize biohazardous material? 1. Dry heat 2. A vacuum 3. 100 humidity 4. Increased air pressure a. 2 and 3 c. 1, 2, and 4 b. 1 and 3 d. 2, 3, and 4 Q. 6 A 1.25 solution of acetic acid has been shown to be an effective bactericidal agent against: a. Staphylococcus au-reus c. Micobacterium tu-berculosis b. Pseudomonas aeru-ginosa d. Streptococcus pneumoniae Q. 7 Carbolic acid is: a. an acetic acid de-rivative. c. the basis for phenol derivatives. b. a common disin-fectant. d. the only form of acid glutaralde-hyde. Q. 8 An oxygen atom can be added to acetic acid to form an excellent disinfectant with sterilization capabilities. This disinfecting agent is: a. peroxide. c. peracetic acid. b. peroxidic acid. d. acetic peroxide. Title: Commercial-grade hydrogen peroxide is an effective disinfectant at room temperature after how many ... Post by: ldages on Feb 25, 2018 Commercially available 3 solutions of hydrogen peroxide are effective disinfectants of bacteria (including Mycobacteria sp.), fungi, and viruses and are active within 10 minutes at room tem-perature. Because the process of autoclaving depends on several factors, heat-sensitive tape and biologic indicators are routinely used to ensure quality control during the process. Heat-sensitive tape that is used for packaging materials for autoclaving changes color when it is exposed to a given tem-perature for a prescribed amount of time. The most common biologic indicators for autoclaving are strips of paper that are impregnated with Bacillus stearothermophilus spores. These strips should be used weekly (at a minimum) to ensure that the autoclave is working properly. Biologic indicators are also used for ethylene oxide sterilization. Because water boils at a lower temperature at high altitudes, exposure time must be prolonged during this form of sterilization at high elevations. Dry heat is another effective method of heat sterilization. Its use is limited to items that are not heat-sensitive. Temperatures must be maintained between 160 C and 180 C for 1 to 2 hours for sterilization. Air is evacuated, moisture is added (100 humidity), and the pressure inside the autoclave is raised to 15 to 20 lb-force per square inch gauge (psig). Air is evacuated from the chamber be-cause residual air prolongs the penetration time of steam, thus increasing the total autoclave cycle time. Pressure is used to raise the temperature of the steam, which is critical because the amount of time required to achieve sterilization depends on the temperature inside of the autoclave. Dry heat is not used during autoclaving. Pseudomonas aeruginosa is killed by 1.25 acetic acid or one part 5 white household vinegar and three parts water. Pseudomonas aeruginosa transmission is through indirect contact via fom-ites, such as those on clothing, surgical bandages, and especially equipment. It is the most com-mon respiratory pathogen in patients with cystic fibrosis and is encountered in patients with chronic obstructive pulmonary disease. Carbolic acid is the prototype 6-carbon aromatic compound. It was first used as a germicide by Lister in his pioneering work on antiseptic surgery. Peracetic acid is an excellent disinfectant with sterilization capabilities. It kills microbes by de-naturing proteins, disrupting cell wall permeability, and oxidizing cellular metabolites. Its short-coming is that it can corrode brass, iron, copper, and steel. Title: Commercial-grade hydrogen peroxide is an effective disinfectant at room temperature after how many ... Post by: yadwinder on Feb 25, 2018 Brilliant
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