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Northeast Laboratories, Inc.

Services/Testing Areas
Alcoholic Beverages
Asbestos
Biodegradation
Cleaners, Detergents and
Related Products

Composting
Compressed Air
Cosmetics
Disinfectants
Environmental
Food and Dairy Products
Hazardous Waste
Indoor Air Quality
Microbiology
Medical Device
Mold Studies
Nutraceuticals
Particle Sizing
Pharmaceutical
Plastic and Paper Goods
Potable Water

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Locations
Berlin Office
129 Mill Street, Suite 11
Berlin, CT 06037
CT 860.828.9787 or 800.826.0105
outside CT 800.654.1230
fax 860.829.1050
Contact the Berlin Office

Microbiology Interpretations

Aerboes : Organism capable of growth only when exposed to air.

Anaerobes : Organisms capable of growth only when not exposed to air.

Enterococcus bacteria : The enterococcus group is a subgroup of the fecal streptococci that includes S. faecalis, S. faecium, S. gallinarum, and S. avium.

The enterococci portion of the fecal streptococcus group is a valuable bacterial indicator for determining the extent of fecal contamination of recreational surface waters.

Studies at marine water bathing beaches indicated that swimming-associated gastroenteritis is related directly to the quality of the bathing water and that enterococci are the most efficient bacterial indicator of marine water quality.

Gram-positive and Gram-negative bacteria : The many thousands of known bacterial species have traditionally been classified into two very large groups on the basis of their reaction to Gram Staining. Species which retain a violet coloration despite washing with alcohol are said to stain Gram-Positive; species which lose the violet coloration with alcohol washing and may be counterstained with a contrasting dye, such as safranin, are said to stain Gram-negative.

Gram staining characteristics appear to be related to structural or metabolic properties of the species, and this characteristic serves as a rapid and very basic step in the identification of the species.

Gram Positive Bacteria - are generally susceptible to basic dyes; their isoelectric point is about pH 2; and, most important, they are generally more susceptible to antimicrobial agents than Gram-negative species.

  • Some of the more common Gram positive bacteria include: Bacillus, Clostridium, Listeria, Staphylococcus, and Streptococcus.

Gram Negative Bacteria : are sensitive to acid dyes; their isoelectric point is about pH 5; and, except for the cocci in this grouping, they are generally less sensitive than the Gram-positive bacteria to antimicrobial agents.

  • Some of the more common Gram negative bacteria include: Enerobacter, Klebsiella, Escherichia (including E. coli), Hemophilus, Pseudomonas, Salmonella, and Shigella.

Pathogens : Disease causing bacterium or fungus.