Monthly Archives: January 2011

31 Jan

Monolithic Columns

High Performance Liquid Chromatography is one of the most useful analytical techniques for separation and identification of substances.  Traditional HPLC columns are packed with spheres of modified silica.  The smaller the spheres the greater the surface area of each sphere.  This … Continue reading

28 Jan

Streptococci Classification

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In 1933 Rebecca Lancefield classified the streptococci on the basis of immunological groups related to carbohydrate antigens associated with the cells.  Her original groups expanded to groups A through V.  Lancefield groups are still used as an important characteristic in … Continue reading

24 Jan

Cosmetic Oils – Filtering and Dispensing

Recently I have been asked the question “Can a laboratory liquid handling device such as bottle-top dispensers be used with oils in cosmetic formulation.”  I have also been asked “What type of filter can I use for my cosmetic oils?” Labmax bottle … Continue reading

21 Jan

Streptococci

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Streptococci differ from the staphylococci in two main ways: they occur in chains instead of clusters and they lack the enzyme catalase, which degrades hydrogen peroxide to form water and oxygen.  Streptococci oftentimes cause mixed infections with staphylococci , but … Continue reading

17 Jan

Glove Box

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Glove boxes are necessary in the lab for many tasks.  The most common use is a controlled atmosphere for sensitive sample or reagent preparation.  Labconco is one of the best known names in glove boxes but there are several 0ther … Continue reading

14 Jan

Bunch of Grapes

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Staphylococcus is derived from the Greek language meaning “bunch of grapes.”  Staphylococci are gram-positive spherical bacteria that divide in more than one plane to form irregular clusters of cells.  In the present edition of Bergey’s manual, the staphylococci are grouped … Continue reading

07 Jan

Staphylococci

Staphylococci and streptococci are referred to as pyogenic (pus-forming) gram-positive cocci.  As a group, they cause abscesses, boils, carbuncle, osteomyelitis, and fatal septicemias.  Staphylococci were originally isolated from pus in wounds but were subsequently demonstrated to be part of the … Continue reading

05 Jan

Anorexia Nervosa

With the holiday season being over and new year’s resolutions began, many people resolve to shed those holiday or year gained pounds that they have unwittingly and unwillingly accumulated. With that being stated it is important that we strive towards … Continue reading