BIO 326R 1st Edition Lecture 24 Outline of Last Lecture I. Biofilmsa. Mechanism of antimicrobial resistanceb. Preventing biofilmsII. Symbiosisa. Rhizobia and nitrogen fixationOutline of Current Lecture I. Endosporesa. Resistanceb. Mxyococcusc. siderophoresCurrent LectureEndospores- present in gram positive bacteriao typically the genus bacillus or chlostridium- Hard to killo Can survive boiling in water for hourso Revived endospores over 100,000 years oldo Can survive 10% bleach for one houro Auto clave 121 degrees C for 15 minutes- Processo Germinate Convert it to a normal cell (vegetative cell)- Structure and FunctionThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.o Contain the DNA of the organismo Some cytoplasm but low watero Tough coating Made up of calcium dipicolinateo Resistance Calcium dipicolinate coating- Stabilizes the DNA Low water Lots of DNA repair enzymes- Resistant to UV lightMyxococcus- Eats other bacteriao Hunting bacteria In groups/wolfpackso Digests from the outside ino More numbers, more enzymes- Can not lyse an endospore- Transfer membrane by sliding next to each othero Makes clones-- each has the same membrane- Fruiting bodieso = spore producing organ- Xanthus uses gliding motility- Starvation triggers the aggregation of 100,000 cells which form from fruiting body- 9 million base pairsSiderophores- Small molecules that bind iron in
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