Presentation on theme: "Online Counseling Resource YCMOU ELearning Drive… School of Architecture, Science and Technology Yashwantrao Chavan Maharashtra Open University, Nashik."— Presentation transcript:
Online Counseling Resource YCMOU ELearning Drive… School of Architecture, Science and Technology Yashwantrao Chavan Maharashtra Open University, Nashik – , India
OC-SEP041-CP01-02 Introduction Programmes and Courses SEP – SBT041 – Unit 01 SEP – SBI041 – Unit 01 SEP – SGS041 – Unit 01
School of Science and Technology, Online Counseling Resource… Cell Wall Less Forms A few bacteria are able to live or exist without a cell wall. The mycoplasmas are a group of bacteria that lack a cell wall. E.g. Mycobacterium tuberculosis, M. Leprae etc. They have sterol-like molecules incorporated into their membranes and they are usually inhabitants of osmotically- protected environments. Sometimes, under the pressure of antibiotic therapy, pathogenic bacteria can revert to cell wall-less forms (called spheroplasts or protoplasts) and persist or survive in osmotically-protected tissues. When the antibiotic is withdrawn from therapy the organisms may regrow their cell walls and reinfect unprotected tissues.
School of Science and Technology, Online Counseling Resource… What We Learn…………. True capsule is a discrete detectable layer of polysaccharides deposited outside the cell wall. A less discrete structure or matrix which embeds the cells is a called a slime layer or a biofilm. Capsules play an important role in attachment & prevention of bacteria from phagocytosis. Gram positive bacterial cell wall consists of several layers of peptidoglycan & teichoic acid is a special feature. Gram negative bacterial cell wall consists of a single layer of peptidoglycan & a unique component LPS is present. Mycoplasmas are cell wall lack forms. Proteins & lipids constitutes a Fluid Mosaic Model of bacterial cell membrane.