Questions tagged [fermentation]

Questions pertaining to the conversion of sugar to ethanol, gas, or acids by bacteria or yeast.

16 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
3
votes
0answers
59 views

Preparation of dihydroxyacetone phosphate from glycerine by fermentation

I read on Wikipedia that dihydroxyacetone (DHA) can be obtained from fermentation of glycerin. I would like to obtain dihydydroxyacetone phosphate (DHAP) for a science experiment but, since I'm 15, I ...
2
votes
0answers
87 views

Is gut bacteria Succinivibrionaceae's low methanogenesis understood well enough for GM of cattle gut bacteria to be considered?

After watching the Periodic Table of Videos episode linked in this question I watched the episode Wallabies and Methane where Sir Poliakoff says (a bit after 02:00):...
2
votes
0answers
144 views

E.coli fermentation - process flow

I have an engineering background and have been assigned a project to look into to failures during E.coli fermentation process using the data available before/during/after the process I have learnt ...
2
votes
0answers
116 views

Why can't there be fructification of mycelium in submerged culture?

I am very new at this. I am wondering why fed batch cultures produce a lot of mycelia but no fruit. I thought the more mycelia you had, the greater chance of it forming a fruit body. I am refering to ...
2
votes
0answers
823 views

Why not use lactase to aid the break down of lactose when making biofuels?

I did an experiment using nine different substrates (Lactose + lactase, corn, sugar cane, glucose control, wood, grass, no yeast control and yeast control) and observed their fermentation rates. ...
2
votes
1answer
685 views

What is this grainy surface on my two-week-old sourdough starter?

I'm baking bread at home as a hobby, using sourdough. After skipping one baking day, I haven't used my sourdough starter for two weeks. When opening the jar in which I keep it, I saw the surface had ...
1
vote
0answers
27 views

What is the role of lactic acid bacteria (such as L. acidophilus and L. bulgaricus) in glycolysis during yogurt fermentation?

I am trying to prove that an increase in monosaccharides (glucose, fructose, galactose) that have been added to milk during fermentation will result in a decreased pH. My current argument is: "The ...
1
vote
0answers
55 views

fermentation in soil bacteria

I am doing a project on microbial fuel cell. For the purpose of the efficiency of the question, MFCs can be summarized to: Devices that use anaerobic bacteria as the catalysts to oxidize organic ...
1
vote
0answers
66 views

Why do some yeast flocculate on top an other at bottom?

When fermenting beer normally after the fermentation has completed the yeast flocculate and drop to the bottom. However occationally they form a foamy layer on top of the beer. The difference is ...
1
vote
0answers
37 views

Thermophilic yoghurt bacteria survivability in the gut

Would they mostly not simply perish since they need much higher than body temperatures to thrive? Are mesophilic ones (such as kefir) much better at that and thus have better probiotic functions?
1
vote
0answers
567 views

How are bubbles formed and how do they make dough rise in bread?

So we took in biology that carbohydrate is broken into $\ce{CO2}$ and ethanol. But all I see in my mind here is that since gas is inside the dough then the gases will try to get out expanding the ...
1
vote
0answers
2k views

How do I measure fermentation rate?

I'm doing a lab soon and I need to find a way to measure fermentation rate to a relatively high degree of accuracy without using a specialized sensor. It should ideally be done with easy to find tools ...
0
votes
0answers
18 views

How is the fermentation in Hákarl different from putrification, at a biochemical level?

My understanding of the types of microbial action in food: Curing: The "non-action" where meat is essentially rendered too salty for much of anything to grow. Sometimes fermentation is used ...
0
votes
0answers
35 views

Public fermentation/cell cultivation database?

I am wondering if there are any large collections of fermentation or cell cultivation data publicly available. I am interested in all cell types used within industrial biotech and biopharma, ...
0
votes
0answers
20 views

Can I use a Flask Weight Ring to increase RPM in an orbital shaking incubator?

I am working on a device that goes on top of the flask. This reduces the maximum RPM that I can use. Therefore I am wondering if I can use a Flask Weight Ring for Erlemeyer flasks in a orbital ...
0
votes
0answers
10 views

What is the typical range of volumetric productivity and cell density in aerobic fermentor bioreactors for microes?

Im doing research on biomass production. Its hard to find data for this question. I need citations to calculate the production rate of microbial biomass in bioreactors (e.g aerated fermentator). ...