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1
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0answers
21 views

How easy is it to detect most vitamins' concentration from a handheld device? [closed]

How easy is it to detect most vitamins' concentration from a handheld device? I am wondering why didn't something like that get created yet? Do tests to detect vitamins differ significantly from one ...
1
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1answer
27 views

DNA Fingerprint

I recently came across an article indicating that the half life of DNA in the most ideal situations is 521 years (http://www.nature.com/news/dna-has-a-521-year-half-life-1.11555). However, since ...
1
vote
1answer
56 views

How is sweetness measured?

Some time ago, I read in a newspaper--though I can't recall the details--a list of (mostly artificial) sweeteners and a list comparing how many times sweeter each was than sugar. How is relative ...
1
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0answers
24 views

Improving throughput of CFU plating?

In a separate question I've described my general experimental setup where I need to measure the number of live cells in a growing bacterial culture in a fairly rapid and high-throughput manner. In ...
6
votes
1answer
280 views

Alternatives to CFU plating for measuring number of viable cells?

I am hoping to measure growth rates of a bacterial culture in several growth conditions. I am concerned that these growth conditions may cause cell death, which would lead to a decreased ...
1
vote
1answer
66 views

What is an on-line measurement? What is an off-line measurement?

See it used here: http://en.wikipedia.org/wiki/Fed-batch. In the table giving the different strategies to control growth in a fed-batch culture, one finds, for example: "on-line measurement of ...
7
votes
2answers
439 views

Free software for measuring parts of an image?

Let's say I have a picture of an insect wing and a ruler on the same image. Is there any computer program that I can use to calibrate with the ruler and then get a measurement on the wing length? ...