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Lactose

Lactose

The major sugar in human and bovine milk. Conversion of lactose to lactic acid by Lactobacilli etc. Is important in the production of yoghurt and cheese. A sugar comprising one glucose molecule linked to a galactose molecule; occurs only in milk; cow's milk contains about 4.7% lactose.A disaccharide sugar which is commonly found in milk. It consists of galactose and glucose, where an enzyme called lactase can break lactose into these two smaller components. Microorganisms convert lactose to pyruvic acid, which results in the souring of the milk for example.


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Streptococcus sanguis??

... Grows in air: + Grows anaerobically: + Catalase: - Oxidase: - Acid from glucose: + OF test: : F Gas from glucose: - Acid from sucrose: + Acid from lactose: + Acid from maltose: + Acid from mannitol: - Acid from dulcitol: - Nitrate reduction: + Citrate utilisation: - Indole production: - H2S production: ...

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by microbiologyhelp
Fri Dec 20, 2013 10:08 pm
 
Forum: Microbiology
Topic: Streptococcus sanguis??
Replies: 1
Views: 808

Secondary Sugars(metabolism/sugar/bacteria/Lac Operon)

... that secondary sugars might be sugars the require cAMP and CRP to be the effector of the operon(along with the operon inducer of course). Since gallactose is what the cell wants the most then the other metabolic operons(like lactose) should be off so any sugar that isn't gallactose is secondary?

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by Vulpess
Mon Dec 16, 2013 6:55 am
 
Forum: Microbiology
Topic: Secondary Sugars(metabolism/sugar/bacteria/Lac Operon)
Replies: 2
Views: 831

Secondary Sugars(metabolism/sugar/bacteria/Lac Operon)

... tomorrow and we are focusing a lot on the lac operon series and some of the metabolic processes of sugars. I know that bacteria cells prefer galactose, but will still use lactose, so does that mean lactose is a secondary sugar? Also does that make allolactose(lac operon inducer) a secondary ...

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by Vulpess
Mon Dec 16, 2013 3:40 am
 
Forum: Microbiology
Topic: Secondary Sugars(metabolism/sugar/bacteria/Lac Operon)
Replies: 2
Views: 831

ID OF UNKNOWN?!?!

... Grows in air: + Grows anaerobically: + Catalase: - Oxidase: - Acid from glucose: + OF test: : F Gas from glucose: - Acid from sucrose: + Acid from lactose: + Acid from maltose: + Acid from mannitol: - Acid from dulcitol: - Nitrate reduction: + Citrate utilisation: - Indole production: - H2S production: ...

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by microbiologyhelp
Fri Dec 06, 2013 10:59 am
 
Forum: Microbiology
Topic: ID OF UNKNOWN?!?!
Replies: 5
Views: 1365

Conflicting results of Gram-Negative unknown

... of the flow chart my professor provided ANY help would be appreciated. My Unknown papers are due tomorrow... 1. MacConkey Agar *Negative for lactose fermentation -Results: No color change in media (remained pink) 2. Eosin Methylene Blue agar * Conflicted about results, believed to be negative ...

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by Jrh21854
Sun Dec 01, 2013 8:25 pm
 
Forum: Microbiology
Topic: Conflicting results of Gram-Negative unknown
Replies: 0
Views: 695
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