PMID: 9182394Mar 1, 1997Paper

Validation of TKT medium for detection of Streptococcus agalactiae in bulk milk samples

Veterinární medicína
P Benda, M Vyletĕlová

Abstract

A selective medium for quantitative determination of Streptococcus agalactiae in bulk milk samples was tested. Among the medium bases, Edwards medium (EW) supplemented with 6 to 9% (v/v) of carefully washed sheep erythrocytes was proved to be best (Tab. V). The production of sphingomyelinasis C (BHE, Tab. II) or D (COREX, Tab. I) as a supplement supporting the formation of specific hemolytic zones in the medium, was tested in four strains of Staphylococcus aureus and seven strains of Corynebacterium pseudotuberculosis. Submersion aerated cultivation was used for enzyme production; optimum cultivation time is about 100 hours (Figs. 1, 2). To determine the activity of the enzymes produced a screening method was developed applying hemolytic interactions with CAMP factor of Str. agalactiae. Method sensitivity and reproducibility are sufficiently high for the purposes of observation (Tab. III). The produced enzymes did not show any changes in their activity over the whole period of storage under all conditions of storage (32 days/7 degrees C, 48 weeks/-18 degrees C, lyophilizate 48 weeks/20 degrees C). Sphingomyelinasis C is more resistant to heat denaturation, not losing its activity even after being warmed to 85 degrees C for 5 mi...Continue Reading

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.