starter culture

(noun)

Starter culture consists of live microorganisms with some medium used to start fermentation or growth in a fresh new medium (substrate).

Examples of starter culture in the following topics:

  • Edible Fungi

    • Different sources provided the starter cultures.
    • Nowadays, the common used starters are pure cultures of Saccharomyces cerevisiae produced and sold as baker's yeasts, although some artisan bakers maintain their own starter cultures.
    • For example, sourdough is made with Saccharomyces exiguus and Lactobacillus cultures that give it its sour taste.
    • Certain mushrooms have been used for their medicinal properties in some cultures.

  • Vinegar

    • This film, called mother of vinegar , can be used as a starter culture of acetic fermentation in fresh alcohol liquids.
    • Mother of vinegar is used as a starter culture for vinegar production.

  • Microbes and Dairy Products

    • Some of the most popular and widespread cultured dairy products are yogurt and cheese.
    • After it is cooled down to about 45ºC, the starter culture of the two species is mixed well with the milk and incubated at the same temperature for a few hours.
    • Yogurt has been traditionally consumed in Eastern cultures as a cold drink after mixing with water (e.g., lassi, ayran, doogh).
    • Other fermented and widely consumed cultured dairy products include kefir (lactic acid bacteria and yeasts are used for the fermentation), sour cream (fermented cream), cultured buttermilk (fermented cow's milk with Streptococcus lactis or Lactobacillus bulgaricus only).

  • Specimen Collection

    • For starters, the interpretation of the observation may be misleading if the specimen is inadequate.

  • Pure Culture

    • It is often essential to isolate a pure culture of microorganisms.
    • Another method of bacterial culture is liquid culture, in which the desired bacteria are suspended in liquid broth, a nutrient medium.
    • As an alternative, the microbiologist may decide to use static liquid cultures.
    • Geomyces destructans in culture from bat tissues.
    • Describe how pure microbial cultures can be grown in agar-based growth medium

  • Tissue Culture of Animal Viruses

    • In practice, the term "cell culture" now refers to the culturing of cells derived from multi-cellular eukaryotes, especially animal cells.
    • The historical development and methods of cell culture are closely interrelated to those of tissue culture and organ culture.
    • Cultured cells, eggs, and laboratory animals may be used for virus isolation.
    • Cell cultures vary greatly in their susceptibility to different viruses.
    • Discover the use of, and reasons for, culturing animal viruses in host cells

  • Batch Culture of Bacteriophages

    • Bacteriophage cultures require host cells in which the virus or phage multiply.
    • Virus or phage cultures require host cells in which to multiply.
    • For bacteriophages, cultures are grown by infecting bacterial cells .
    • Virus or phage cultures require host cells in which to multiply.
    • For bacteriophages, cultures are grown by infecting bacterial cells.

  • Preserving Bacterial Cultures

    • Take the overnight culture and and mix an aliquot with 40% glycerol in sterile water and place in a cryogenic vial.
    • While it is possible to make a long term stock from cells in the stationary phase, ideally your culture should be in logarithmic growth phase.
    • To do this, spin the culture down and resuspend it in the same volume of straight LB medium.
    • An erlenmeyer containing a bacterial culture.
    • Describe how bacterial cultures can be stored for a long time at -80C in glycerol

  • Koch and Pure Culture

    • He invented methods to purify the bacillus from blood samples and grow pure cultures.
    • Additionally, it must be absent in healthy organisms prepared and maintained in a pure culture capable of producing the original infection, even after several generations in culture retrievable from an inoculated animal and cultured again.
    • Pure cultures of multicellular organisms are often more easily isolated by simply picking out a single individual to initiate a culture.
    • This is a useful technique for pure culture of fungi, multicellular algae, and small metazoa.
    • Developing pure culture techniques is crucial to the observation of the specimen in question.

  • Special Culture Techniques

    • Animals can often be used to culture microbes.
    • Using animals to culture human-pathogens has problems.
    • Some human pathogens are grown directly on cells cultured from humans.
    • The human cell culture known as McCoy cell culture is used to culture this bacteria .
    • A candle is lit in a jar with a culture plate.