What is a thermophilic spore?
Abstract. Thermophilic spore-forming bacteria such as Geobacillus spp. are common contaminants of milk powder processing plants. Their spores can remain viable throughout the entire dairy powder industrial process, including pasteurisation (72 °C for 15s) and the even hotter evaporator sections. Geobacillus spp.
What does it mean to be spore-forming?
Some bacteria such as the Bacillus and Clostridium species are able to form spores. These spores, also referred to as endospores, are the dormant form of vegetative bacteria and are highly resistant to physical and chemical influences.
What are the spore formers?
Spore-forming bacteria include Bacillus (aerobic) and Clostridium (anaerobic) species. The spores of these species are dormant bodies that carry all the genetic material as is found in the vegetative form, but do not have an active metabolism.
What is the genus of anaerobic spore formers?
Clostridium
The two medically-important genera are Bacillus, the members of which are aerobic spore formers in the soils, and Clostridium, whose species are anaerobic spore formers of soils, sediments and the intestinal tracts of animals.
Are thermophiles aerobic?
Thermophiles are a group of heat loving microbes thriving at high temperature usually more than 45°C. Morrison and Tanner (1922) instigated culture of aerobic thermophilic bacteria from water samples of the Illinois State Water Survey.
How can thermophilic bacteria be preserved?
There are various methods of preservation of the bacterial cultures described. These are preservation through glycerol stock, sub-culturing of the vials or slants, lyophilization, cryopreservation, preservation in liquid nitrogen etc.
What causes spore formation?
Endospore formation is usually triggered by a lack of nutrients, and usually occurs in gram-positive bacteria. In endospore formation, the bacterium divides within its cell wall, and one side then engulfs the other. Endospores enable bacteria to lie dormant for extended periods, even centuries.
What is the importance of spores?
Medical Importance of Bacterial Spores
| Important features of Spores | Medical Implications |
|---|---|
| Spores can survive for many years in soil and other inanimate objects. | Wound contaminated with soils can be infected with spores and cause diseases such as tetanus, gas gangrene. |
What are non spore formers?
Non-spore-forming bacteria are a group of bacteria that do not produce spores. Generally, they are non-pathogenic bacteria and they live in the intestine of animals and insects. This means that non-spore-forming bacteria are not active invaders.
Are all Bacillus spore formers?
The gram-positive spore-forming bacilli are the Bacillus and Clostridium species. These bacilli are ubiquitous, and because they form spores, they can survive in the environment for many years. Bacillus species are aerobes and the Clostridium species are anaerobes (see also Chapter 21).
Which of the following genera are spore-formers?
Spore forming bacteria are tougher than the average microscopic unicellular organism. These species, which include the genera Bacillus, Clostridium and Sporolactobacillus, can surround themselves with durable coats of protein that allow them to survive in hostile environmental conditions.
What are non spore-formers?
Scott et al. (2007) found that thermophilic spore counts in powder, primarily consisting of Anoxybacillus and Geobacillus, increased by nearly 4 orders of magnitude from the beginning of a processing run through the end (~18 h) in one plant, due primarily to spores present in foulant sloughed off during production.
What is the phylum of spore forming bacteria?
Spore-forming bacteria belong to the same Firmicutes phylum but to different classes. They are psychrotrophic, mesophilic or thermophilic, aerobic or anaerobic, and use minerals or organic molecules for energy formation.
Is there a relationship between optimal growth temperature and spore resistance?
A relationship between optimal growth temperature and spore resistance has frequently been observed. Spoilage risk management implies taking into account many parameters, including species, and individual cell variability, but also food composition and food processing parameters.
How to quantify thermophilic anaerobic H2S producing spores?
The thermophilic anaerobic H2S-producing spores are quantitated by the presence of sulfide production in a selective and differential medium. SCOPE The method is applicable to starches, sugars, syrups and coproducts of the corn wet milling industry.