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- If the pH indicator were left out of MacConkey agar, the medium would bea) complex.b) differential.c) defined.d) defined and differential.e) complex and differential.Compute the cfu/g (lactic acid bacteria and coliforms) of these samples given the following values below. Show your solution. Media First Sampling First Sampling First Sampling Second Sampling Second Sampling Second Sampling 10-2 10-3 10-4 10-2 10-3 10-4 VRBA TNTC, TNTC 243, 232 24,22 23, 25 0, 0 0, 0 MRS 32, 40 0, 0 0, 0 TNTC, TNTC TNTC, TNTC 102, 120Prove if the statement is TRUE or False with complete solution. At a dilution factor of, UHT-pasteurized milk sample X yielded the following bacterial colony counts when spread-plated in quadruplicates: 23, 20, 35, and 41 CFU/plate. As a result, the milk sample will pass laboratory standards if the total microbial limit is set to "not to exceed 30,000 CFU/mL of milk sample."
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- diameter AM=47MM TE= 27 MM both left hand side is ampicillin and right hand side is tetracycline With reference to the table below, determine the antibiotic susceptibilities of different antibiotics against coli and S.aureus. S.aureus Antimicrobial agent Interpretive categories and zone diameter breakpoints, nearest whole mm sensitive Intermediate resistant Tetracycline >19 15-18 <14Calculate the amount of phycocyanin in Sample 1 in mg where A620=0.204 and A650=0.061, taking into account the dilution factor as per question 6, and the total volume of extract as per question 4. Note your answer to 2 decimal places Sample 1 Total Extract Volume (ml) is 45 Dilution factor is 100 A280 is 1.07 A620 is 0.221 A650 is 00.97 Specific Absorbance Ratio (SAR) A620/A280 is 0.206Mannitol Salt Agar: Is the organism Osmotolerant or non-osmotolerant ______________________________ Mannitol fermenter or non-fermenter: ___________________________ Genus of organism determined from MSA plate: ________________________________
- Many antibacterial hand soaps contain the chemical agent _____ , which belongs to the _____ antimicrobial category. a. sodium hypochlorite; halogen b. triclosan; phenolic c. sodium chlorite; halogen d. ethanol; alcoholWhich of the following is false?a) A high-level disinfectant cannot be used as a sterilant.b) Critical items must be sterilized before use.c) Low numbers of endospores may remain on semicritical items.d) Standard sterilization procedures do not destroy prions.e) Quaternary ammonium compounds can be used to disinfect food preparation surfaces.Explain how to prepare 250 ml liquid and 500 ml solid form separately from LB (Luria Bertani) medium whose components and concentrations are given below. Yeast extract 5 g/L Peptone 10 g/L NaCl 10 g/L Agar 1.5 g/L