What are the physical states of media?
What are the physical states of media?
Different types of culture media are typically divided, based on the physical state of the media, into:
- Liquid culture media, commonly called “broth”
- Solid and semi-solid culture media, commonly called “agar”
What physical properties of agar make it useful in culture media?
The usual gelling agent for solid or semisolid medium is agar, a hydrocolloid derived from red algae. Agar is used because of its unique physical properties (it melts at 100oC and remains liquid until cooled to 40oC, the temperature at which it gels) and because it cannot be metabolized by most bacteria.
What are the physical requirements for microbial growth?
The requirements for microbial growth can be divided into two main categories: physical and chemical. Physical aspects include temperature, pH, and osmotic pressure….Physical Requirements
- psychrophiles (cold- loving microbes),
- mesophiles (moderate-temperature-loving microbes),
- thermophiles (heat-loving microbes).
Do microwaves kill food bacteria?
The microwave oven emits microwaves which cause food molecules to vibrate. The resulting friction causes heat. This heat can get hot enough to kill the bacteria in foods. These cold spots are uncooked or unheated food where bacteria can survive.
At what temperature will a human die?
44 °C (111.2 °F) or more – Almost certainly death will occur; however, people have been known to survive up to 46.5 °C (115.7 °F). 43 °C (109.4 °F) – Normally death, or there may be serious brain damage, continuous convulsions and shock. Cardio-respiratory collapse will likely occur.
Which US city has the best weather?
These Are the Places with the Best Weather in America
- Jackson, Kentucky. 1/20.
- Wallops Island, Virginia. 2/20.
- Oklahoma City, Oklahoma. 3/20.
- Vero Beach, Florida. 4/20.
- Hilo, Hawaii. 5/20.
- Cape Hatteras, North Carolina. 6/20.
- Santa Maria, California. 7/20.
- Miami, Florida. 8/20.