Dictionary » D » Density



1. (Science: radiology) The amount of darkness or light in an area of a scan reflects the compactness and density of tissue. Differences in tissue density are the basis for CT and MR scans.

2. (Science: microscopy) logarithm to the base 10 of the reciprocal of transmittance.

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centrifugation of hemocytes

... the cells pelleted, they are just not viable. If you do not get any signal, you have problem with your centrifugation. Teo things to consider - density and viscosity of your sample (is that only the lymph or do you add anything?) and amount of your sample in the tube/well.

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by JackBean
Thu Jan 30, 2014 9:34 am
Forum: Cell Biology
Topic: centrifugation of hemocytes
Replies: 5
Views: 631


... of the measuring jug she is using in an experiment. The label on the jug claims that it measures volume to an accuracy of plus or minus 5 cm3. The density of water is about 0.999 g cm−3, which means that 100 cm3 of water should have a mass of about 100 g. She repeatedly measures out 100 cm3 samples ...

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by zak
Tue Dec 10, 2013 1:54 pm
Forum: General Discussion
Topic: biology
Replies: 1
Views: 569

Re: Organism that create or supress water

... gaseous state. The product of a chemical reaction has a new composition and can have many different physical properties than the reactants (color, density, thermal conductivity, heat capacity, etc.).

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by jonmoulton
Mon Aug 12, 2013 4:32 pm
Forum: General Discussion
Topic: Organism that create or supress water
Replies: 10
Views: 1614

Question about Type II Topoisomerase

... type II topoismerase functions, only the number of writhe decreases. I was wondering if the DNA molecule will form supercoil again because the density of twist is still very high? Thanks!

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by maimaiti2008
Thu Jun 13, 2013 9:06 am
Forum: Molecular Biology
Topic: Question about Type II Topoisomerase
Replies: 0
Views: 424

Re: Bacterial Calculation

... then it`s 8.5*10^6 cfu/mL, which is already close to the concentration you need. To get more precise values, you could grow the cells to a higher density than you actually need and dilute them to the desired concentration.

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by EnricoPallazzo
Sun Jan 13, 2013 9:43 am
Forum: Microbiology
Topic: Bacterial Calculation
Replies: 3
Views: 2467
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