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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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Re: Science vs. Science Fiction, non-scientist needs help

... For bacteria to grow, they need some kind of carbon source (e.g. organic matter). This is usually in the form of basic sugars such as glucose or lactose. How do they grow if their growth conditions are purely non-organic rock?

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by sosippus
Wed Sep 24, 2014 8:16 pm
 
Forum: Microbiology
Topic: Science vs. Science Fiction, non-scientist needs help
Replies: 2
Views: 780

Stomach bloating and weight gain

Common causes of bloating related to foods include eating a lot of foods high in fiber, irritable bowel syndrome, lactose intolerance, fructose malabsorption and intestinal parasites.

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by boron
Sat Sep 06, 2014 2:06 pm
 
Forum: Physiology
Topic: Stomach bloating and weight gain
Replies: 453
Views: 2731718

Determine whether gene lac I and lac O is functioning?

My sample is treated in 3 ways: No inducer, with lactose , with IPTG. ONPG is used in all sample to determine the beta galactosidase. I know that both lactose and IPTG can associate with lac repressor and cause expression. If the result of these ...

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by eos
Fri May 09, 2014 11:57 am
 
Forum: General Discussion
Topic: Determine whether gene lac I and lac O is functioning?
Replies: 0
Views: 640

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: 2426

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: 1938
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