4. numbers of acid producing bacteria in the mouth (Lactobacilli) - ANSWER
What are the four factors that determine a person's susceptibility to dental
carries?
test for the number of oral-acid producing bacteria - ANSWER In lab we cannot
test for genetic make up, dental hygiene habits or diet, but we will ___
caries - ANSWER studies have indicated a correlation between high numbers of
oral Lactobacilli and an increased susceptibility to ___
Snyder Caries Test - ANSWER the ___ is performed to determine susceptibility
to caries, not whether or not a person has cavities
qualitative; quantitative - ANSWER the snyder caries test will involve a ___ test
for numbers of lactobacilli, a ___ determination of lactobacilli will not be done
glucose; bromcresol green - ANSWER snyder medium contains 2 key
ingredients, ___ and the pH indicator ___.
,glucose - ANSWER ___ is in the snyder medium to serve as a source of food
lactobacillus - ANSWER ___ in the snyder medium will ferment glucose
producing acid, resulting in the pH of the medium decreasing
yellow - ANSWER bromcresol green is green at basic pH, but turns ___ in the
presence of acid.
fast - ANSWER in the snyder carie test, lactobacillus numbers will be estimated
by how ___ the medium turns yellow
marked - ANSWER please indicate the caries susceptibility for the following:
medium turns yellow in:
24 Hr 48Hr 72 Hr
+
moderate - ANSWER please indicate the caries susceptibility for the following:
medium turns yellow in:
24 Hr 48Hr 72 Hr
-+
slight - ANSWER please indicate the caries susceptibility for the following:
,medium turns yellow in:
24 Hr 48Hr 72 Hr
--+
negative - ANSWER please indicate the caries susceptibility for the following:
medium turns yellow in:
24 Hr 48Hr 72 Hr
---
Negative; the medium did not turn yellow, meaning there was no acid present.
acid keeps our pH level where candida (thrush) can't survive - ANSWER one
person has "marked" susceptibility to caries the other has a "negative" result.
both people are put on high doses of antibiotics. which person will have a greater
risk of developing thrush?
psychrophiles - ANSWER -optimal growth temperature between -5C and 20C.
-these bacteria will be found in the arctic ice and in antartical
-in MI they will be found on snow, and in very cold water; ex. lake superior
mesophiles - ANSWER -optimal growth temperature between 20C and 50C.
-most pathogens fall in this class (since most grown between 35C and 40C)
-body temp: 37C
, thermophiles - ANSWER -optimal growth between 50 and 80C
-bacteria in this group occur in soil where the midday temperature reaches
greater than 50C or in compost piles where fermentation activity can cause
temperatures to exceed 60 and 65C
-heat loving
hyperthermophiles - ANSWER -growth optimum above 80C
-there are many bacteria that occupy environments that are heated by volcanic
activity where water is super heated to above 100C
-these bacteria have been isolated from thermal vents deep within the ocean
floor and from volcanic heated hot springs
psychrotrophs - ANSWER -these microbes can grow both at mesophilic and
psychrophilic temperature ranges
-most are nonpathogens that grow faster at the mesophilic temperature range
-primarily associated with the spoilage of refrigerated food, but a few species are
pathogenic
-these pathogens, which include, include Listeria monocytogenes and Yersinia
enterocolitica, grow faster at the psychrophilic temperature ranges
Psychrophiles - ANSWER Please indicate the microbial species
(+ growth - no growth)
Temp C 5 25 37 45 55
+----
Mesophiles - ANSWER Please indicate the microbial species
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