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The act of making quantitative observations of biological phenomena.

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Average width of the male body

I've been looking for the average width (at widest point) of the average American male body but couldn't find it anywhere so far. When I say "widest point", I mean that if you draw a rectangle (that ...
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1answer
24 views

How can I measure the population growth of yeast?

So I will soon have to carry out an experiment. I thought about estimating the rate of growth of a populaiton of yeast, although I do not know if it is possible to at least estimate the number of ...
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1answer
23 views

What does this biomass measurement mean and how to translate it to volume

This is probably a softball question but because of the nature of the term, it's difficult to Google. I am not a biologist, I am a web developer. :-) What does this measurement mean (it is a ...
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1answer
21 views

Is there a chemical that can be used to subdue ants only temporarily without permanent harm?

I would like to know as I want to contribute to a biodiversity project that wants to create a database with ant feature measurements. I'm not sure if I like the idea of killing ants however (even ...
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2answers
92 views
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1answer
58 views

What would EEG recordings reveal if their resolution was better?

1. Temporal resolution Of course, we would see higher frequencies. But would these be informative? Aren't the frequencies measured today near the border to noise? 2. Spatial resolution I guess LFP ...
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3answers
8k views

What is the average speed of human sneeze?

I sneeze a lot, at various times and various "volumes", and often wonder about the speed of the sneeze itself, i.e. the speed of the air coming out of the nose while sneezing. What is the average ...
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2answers
927 views

Measuring the Rate of Photosynthesis

Update: I have just received a grant to pursue this research. However, I must still perform the preliminary experiment described below before dipping into my very limited funds. Thank you for any ...
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1answer
458 views

How can I measure bee and wasp population?

Bees and wasps in our garden disappeared suddenly last year - I asked a question about it at Why our bees might have suddenly disappeared. This year, I see that some bumblebees are active now. I'd ...
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1answer
2k views

How to convert skin temperature to core temperature?

As opposed to regular invasive thermometers, there are non-invasive IR thermometers to measure the temperature. For example Thermofocus. I read in many sources that these IR thermometers only measure ...
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1answer
2k views

A way to measure ripeness of a fruit

I'm doing an experiment how fast fruits ripen and decay I'm wondering how to measure the ripeness of a fruit(banana, mango, tomato, kiwi etc.) so that I will get a quantitative results. I have ...
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0answers
37 views

Spectroscopy on plant leafs

I'm trying to do spectroscopy readings on plants where I shoot electromagnetic waves and look at their signature/profile. I want to be able to do this at a distance, in the field and on live plants ...
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0answers
19 views

Is there a resource for comparing categories of life along quantifiable dimensions such as species diversity, geographic range, total mass, etc?

Ideally what I would like is some sort of interactive, sliceable tabular data along the lines of my examples below. The curious individual specifies the level of taxonomic rank, e.g. Kingdom or Class ...
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1answer
599 views

Cough at 1000 km/h?

How fast does air move in the airways during a cough? The following passage is from Talley and O'Connor's Clinical examination: a systematic guide to physical diagnosis (emphasis mine): Cough is a ...
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1answer
61 views

How do you determine the length of an annelid?

I'm currently studying a horse-leech, and would like to know if it is fully grown or not. When I read about different annelid species a maximum length is often given, so I wonder if there is some ...
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0answers
125 views

The most reliable way of identifying deer antler measurements?

I am creating a (theoretical) study on how males use antlers to assess fellow males' abilities. I thus would need to have accurate measurements of antlers, including length, width, number of tines etc....
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0answers
79 views

How can I measure the curvature of bird's beak on the field?

I'm wondering if there is a standard tool to measure the bird's beak curvature. It seems that a spherometer wouldn't work because the beaks that I'm measuring are not circular but more parabolic. ...
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0answers
1k 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 ...
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1answer
278 views

How are individual neuron firing rates characterized?

I'm reading this paper that the Human Brain Project published in Cell and I'm confused how they recorded the firing rates shown in the firing below: In the publication, they mention that they use the ...
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1answer
74 views

How is output of DNA assembler measured?

I developed own DNA assembly pipeline. Input is set of reads and output is set of contigs. Many papers measure own algorithms and compare it against each other. There are basic metrics like: N50, N70....
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1answer
70 views

Possible calculations with temperature, humidity, images and VIS spectrum of a plant in an Integrating sphere

I am currently working on a project which involves growing some plants in a integrating sphere made of foam. I have added temperature, humidity and soil moisture sensors as well as a Spectrometer (350 ...
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1answer
3k views

How does pressure measured by sphygmomanometer translate directly to blood pressure?

As per my understanding a sphygmomanometer when wrapped around the arm and inflated only measures the pressure of the air inside the cuff, doesn't it? How does that translate directly to the pressure ...
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0answers
2k views

What's the difference between blood value units 'mE/l', 'mU/l', 'mIU/l' and 'mEq/l'?

Wikipedia suggests 'mE/l' is the dutch or german translation (using 'eenheid'/'einheit' for 'unit') for 'mU/l', which can also be written as 'mIU/l'. The article mentions ...
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1answer
118 views

Is there a way to examine amount of red/white muscle fibers without biopsy?

I want to conduct some research on red and white muscle fibers, why do some people tire during certain movements while others do not. Obviously I can't get a biopsy on the subjects so I wanted to hear ...
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1answer
704 views

Which wavelength to use to determine algae using a colorimeter?

I am doing a Biology project involving the measurements of the density of algae (Nannochloropsis) using absorbance colorimetry. What wavelength should I set my colorimeter to? The issue is that there ...
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2answers
2k views

Using an analytical balance (0.0000 precision) to measure µg (micrograms)?

If i needed to prepare 200µg/ml of proteinase K, and the proteinase K was in a solid powder form, would I have to weight out 200 µg using an analytical balance, and if so, is it possible with a ...
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1answer
102 views

Reconstruction of wildlife distribution based on poorly-sampled data [closed]

cross-posted to Signal Processing, Cross Validated, and World Building Stack Exchange Hi, I thought I'd also put this here in case there are any field biologists with ideas on the matter. Problem: ...
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1answer
24k views

Arm at Heart Level when Measuring Blood Pressure

How come that one's arm has to be at heart level so that the blood pressure can be measured accurately. I've tried researching this question, but most answers to it were just "if the arm is above the ...
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1answer
57 views

How is the reflectance spectrum of solids measured?

I was reading this question about autumn leaf colors. One of the answers refers to an article by Archetti et al. In the article, box 4 (page 5) shows the reflectance spectra of leaves of different ...
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1answer
311 views

What are the requirements for a spectrometer to be used in biological research?

Suppose one would do spectrophotometry on biological materials. What would be the minimum requirements for the measuring device so that the results could be published in a reputable journal? I suppose ...
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1answer
44 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 human'...
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1answer
665 views

Can you measure plasma glucose with a regular glucose meter?

I'm wondering if plasma glucose can be measured with a regular glucose meter and strips like this. I know these meters are normally used to measure whole blood glucose, but can they measure plasma ...
4
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1answer
180 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 ...
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0answers
75 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 ...
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2answers
1k 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 ...
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1answer
3k 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 glucose"...
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2answers
11k views

Free software for measuring parts of an image? [closed]

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? ...