2021年5月26日 · Describe general characteristics of bacterial growth on agar plates; Explain how to inoculate growth media using proper aseptic procedures; Describe the process for inoculating sterile media; Describe the procedure (T-streak) for isolation of single bacterial colonies

Agar (agar agar) or bacteriological agar is a thermoreversible gelling agent extracted from the cell walls of smaller seaweeds (red algae). Agar is obtained from red algae belonging to the genera Gracilaria, Ahnfeltia, Gelidium, and Pterocladiella. Bacteriological agar has no taste or smell and is often added to food with other ingredients.

Agar plates are the standard solid support material for growing microorganisms. Microbial growth media contains nutrients and an energy source to fuel the microbes as they grow, and agar to keep the media in a semi-solid, gel-like state. On solid media, a single microbe will grow and divide to produce a "colony," a spot of identical descendants.

Growing bacteria, or other microorganisms, on agar plates is a common step in microbiology experiments. There are two methods for inoculating (putting the bacteria on) agar plates: quadrant streaking and spread plating .

2024年10月23日 · Agar is essential in antibiotic susceptibility testing. The disc diffusion method, or Kirby-Bauer test, uses agar plates to determine how effectively antibiotics inhibit bacterial growth. The clear zones formed around the antibiotic discs on agar allow researchers to measure the strength of the antibiotic. Molecular Biology:

2025年1月22日 · An example of a selective medium is MacConkey agar. It contains bile salts and crystal violet, which interfere with the growth of many gram-positive bacteria and favor the growth of gram-negative bacteria, particularly the Enterobacteriaceae. ... The bacteria grew on mannitol salt agar fermenting mannitol, as shown by the change to yellow of ...

To reduce the chance of contracting a current or emerging infectious disease while working in the lab under epidemic or pandemic conditions, we recommend you follow these best practices. Wash your hands well when entering and leaving the lab. Master the basics of proper personal protective equipment (PPE) use and removal.

Agar is a phycocolloid extracted from a group of red-purple marine algae (Class Rhodophyceae) including Gelidium, Pterocladia and Gracilaria. Gelidium is the preferred source for agars. Impurities, debris, minerals and pigment are reduced to specified levels during manufacture. Agar is a gel at room temperature, remaining firm at temperature as ...

The margin growth of a bacteria describes how the edges of the colony appear under a microscope and can appear: with a smooth rounded edge called entire. Bacteria can grow with a bumpy edge called undulate. A filiform margin has small branch like growth that spreads outward. A curled margin appears as wave-like layers spreading outward.

Bacteriological agar is commonly used as a culture medium for microorganism. It is useful for fermentation process. Agar-agar serves as a preservative in food processing. It also possesses various other applications such as an emulsifier, carrier, lubricant, stabilizer, laxative disintegrant in pharmaceutical and cosmetic industries.