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Monthly Archives: August 2009

31 Aug

Colorimeters are devices for determining the concentration of a substance in solution. A colorimeter uses the absorbance of light by the substance to determine the concentration. Filters or light emitting diodes are used to produce the desired light wavelength. Usually … Continue reading

28 Aug

A microbiological culture, or microbial culture, is a method of multiplying microbial organisms by letting them reproduce in predetermined culture media under controlled laboratory conditions. A microbiological culture is used as a diagnostic tool in microbiology to dermine the amount … Continue reading

25 Aug

Hello to all the brew masters of the world! Let me introduce you to your best friend, the Alcohol Hydrometer. An Alcohol Hydrometer is used to measure the strengths of spirits based on the percentage of alcohol by volume at … Continue reading

24 Aug

No it’s not a law about beer as in ale. Beer’s law, or the Beer-Lambert law describes the relationship between absorbance of light by a substance, the distance the light travels through the substance, and the concentration of the substance. … Continue reading

21 Aug

A buffer solution consists of a weak acid and its conjugate base or a weak base and its conjugate acid. Buffer solutions are designed to keep the ph constant in a variety of chemical and biological applications. Their resistance to … Continue reading

18 Aug

If you look at the top right side of the Objective you can see the Nosepiece Mounting Thread, all Mounting Threads should be sized according to the Standards of the Royal Microscopical Society (RMS) for universal compatibility. Aberration Correction is … Continue reading

17 Aug

RCF RPM? I often get the question “What is the maximum RCF (or g) for these 50 ml centrifuge tubes?” I also get the question “What is the maximum RPM for these 50 ml centrifuge tubes?” The first question is … Continue reading

14 Aug

You may have heard the term ELISA if you work in a hospital or laboratory. An ELISA or enzyme linked immunosorbent assay is a laboratory technique used to detect the presence of antibody in a sample. Medical professionals can use … Continue reading

11 Aug

Cuvette is a term used for the cell which holds the sample in a spectrophotomer. Sometimes the term cuvet is also used. The standard cuvette is 10mm square, about 45mm tall and made of either glass, plastic or quartz. Glass … Continue reading

10 Aug

Lets explore the characteristics of a microscope objective. Everything that you need to know about a microscope objective should be visible to you on the outer housing of the objective as seen in the illustration. The illustration is of a … Continue reading