How effective are germicidal lamps against bacteria?
germicidal lamps is at 254 nanometers, the region of germicidal effectiveness most destructive to bacteria, mold and virus.
Which heavy metals are still used in germicidal preparations?
__ and mercury are heavy metals that are still used in germicidal preparations. Which of following compounds are commonly used as gaseous sterilants or disinfectants? 2. Sporicidal 3. Microbicidal
What is a germicide?
A germicide is a substance that kills bacteria and microorganisms. Germicides also fall into the category of bacteriostatic agents that do not directly kill bacteria but hinder their development.
Is the effectiveness of an antimicrobial agent governed by time?
True or False: The effectiveness of an antimicrobial agent is only governed by time. Antimicrobial There are many factors that may influence the action of __ agents besides time.
Which of the following are some of the desirable qualities in a germicide quizlet?
Some desirable qualities that you want in your chosen germicide: - Rapid action even in low concentrations. - Solubility in water or alcohol and long-term stability. - Broad-spectrum microbicidal action without being toxic to human and animal tissues.
What factors must be considered in order to adequately sterilize using heat?
What factors must be considered in order to adequately sterilize using heat? Steam under pressure. An autoclave is a sterilization chamber that allows the use of __ to sterilize materials....A bactericide __ bacteria.Presence of water.Temperature.Length of exposure.
Which one of the following methods is bactericidal?
Which one of the following physical methods of microbial control is bactericidal? Incineration is a physical method of microbial control. It is bacteriocidal.
Which of the following are direct methods that can be used to measure microbial growth?
Name 5 DIRECT methods of measuring microbial growth. viable plate counts. membrane filtration. microscopic counts. electronic counters. Most Probable Number.
Which of the following is the best method to sterilize heat sensitive solutions?
Membrane filtration is the best technique. Membrane membrane filtration is the best technique to sterilize the heated by solutions as we know that these solutions can be destructed in the presence of heat. And all these techniques like pasteurization, autoclave and dry heat.
What are the 4 methods of sterilization?
Moist Heat Sterilization 2. Dry Heat Sterilization 3. Gas Sterilization and Others. Moist Heat Sterilization: Moderate pressure is utilized in steam sterilization.
Are antibiotics bacteriostatic or bactericidal?
Antibiotics were defined as bactericidal and bacteriostatic according to a classification obtained from a major textbook of infectious diseases, with one important exception (Table 1). Aminoglycosides act at the ribosome and are therefore classified as bacteriostatic by some authors.
Which of the following is most likely to be bactericidal?
chaper 7 microbQuestionAnswerWhich of the following is most likely to be bactericidal?ionizing radiationWhich of the following is used to control microbial growth in foodsorganic acidsThe removal or destruction of all forms of microbial life is calledSterilization19 more rows
Why is bacteriostatic better than bactericidal?
Bacteriostatic treatments differ from bactericidal versions in that they inhibit the growth and multiplications of bacterial cells, rather than directly kill them. Bacteriostatic agents can achieve this by obstructing the metabolic mechanisms of the bacterial cell, in most cases targeting the protein synthesis.
Which technique is useful to measure growth of living bacterial cells?
Measuring Bacterial Growth can be achieved by using Hemocytometer. The cells can be counted using Hemocytometer. It was invented by Louis-Charles Malassed and further modified by Neubauer.
What three major techniques are used to measure microbial growth?
Methods to Measure Bacterial Growth:Direct microscopic count - A population is measured by counting the number of cells seen under a microscope. ... Colony counting - A sample is spread on an agar medium. ... Turbidity - This is an indirect measurement of bacterial growth.More items...
Which is the most commonly used method of measuring a bacterial populations size?
The most frequently used method of measuring bacterial populations is the plate count. An important advantage of this method is that it measures the number of viable cells.
What is the process that completely removes or destroys all viable microorganisms, including viruses, from an
1. a process that completely removes or destroys all vegetative micoorganisms, including viruses, from an object or habitat. 2. a process that completely removes or destroys all viable microorganisms, including viruses, from an object or habitat.
What is thermal death time?
What is the thermal death time? 1. the time it takes to reduce a microbial population to safe level. 2. the lowest temperature at which all microbes are killed within ten minute. 3. the shortest length of time require to kill all test microbes at a specific temperature.
What is ultraviolet?
Ultraviolet light is part of the light spectrum, which is classified into three wavelength ranges:
What is germicidal ultraviolet?
UV-C light is germicidal – i.e., it deactivates the DNA of bacteria, virus and other pathogens and thus destroys their ability to multiply and cause disease. Specifically, UV-C light causes damage to the nucleic acid of microorganisms by forming covalent bonds between certain adjacent bases in the DNA.
What are the beneficial uses of germicidal ultraviolet?
Ultraviolet technology is a non-chemical approach to disinfection. In this method of disinfection, nothing is added which makes this process simple, inexpensive and requires very low maintenance.
How do ultraviolet purifiers work?
Atlantic Ultraviolet Corporation’s purifier units contain one or more germicidal ultraviolet lamps. STER-L-RAY ® Germicidal Lamps are shortwave, low pressure tubes that produce ultraviolet wavelengths lethal to microorganisms.