Definition
: compounds that have some antimicrobial activity
from nature source
① plant origin
green chemicals
Spices and herbs are well known to inhibit
bacteria, yeasts, and molds.
② Microbial origin
Biopreservatives
main stream field of study is the use of
lactic acid bacteria(LAB).
Definition
host-synthesized, l
③ 항생제를 이용한 미생물 성장 조절
Antibiotic sensitivity 는 박테리아의 antibiotics 에 대한 감수성을 표현하는 것으로 Antibiotic susceptibility testing(AST)는 antibiotic이 bacterial 감염에 대해 효과적인 가를 결정하는데 사용한다. 이를 위한 실험에는 Kirby-Batuer method, Disk diffusion method가있다. 그리고 Liquid dilution test
Procedure
□▪실험 1
Escherichia coli와 Bacillus subtils를 starch agar plate에 배양해서 키운다.
다음 날 특징을 관찰 하고, Iodine을 넣은 뒤에 발생하는 두 Bacteria 사이의 특징을 비교한다.
□▪실험2
E. coli와 B. subtils를 Skim milk agar에 넣어두고 하루 간 배양 한 뒤 차이점을 구별한다.
□▪실험3
Durham tube
1. Introduction
1) Definition of preservation and food-spoilage micro-organisms
Food preservation is the process of treating and handling food to stop or greatly slow down spoilage (loss of quality, edibility or nutritive value) caused or accelerated by micro-organisms. Some methods, however, use benign bacteria, yeasts or fungi to add specific qualities and to preserve food (e.g., cheese, wine
Activation of complement, Impaired organ perfusion Acidosis, Disseminated intravascular coagulation(DIC), Shock and Death
(2) Capsule: Anti-phagocytosis, Major Functions
(3) Antigenic phase variation: 미생물이 antibody-mediated cell death 로부터 방어
(4) Siderophores: 숙주로부터 iron 착취
(5) Antimicrobial resistance: plasmid genes 이 지배
4) Diagnosis, 생