Gram positive bacteria are more susceptible towards the lysozyme action because of their cell wall content up to 90% peptidoglycan layer Very low and are imbedded in the cytoplasmic membraneįormation of endospore during unfavourable conditions (eg: Bacillus cereus, Bacillus anthracis, Bacillus thuringiensis Clostridium botulinum, Clostridium tetani) Two rings in basal body, one in the peptidoglycan layer and one in the plasma membraneįour rings in basal body: L ring in the lipopolysaccharide layerP ring in the peptidoglycan layerM ring embedded in the plasma membraneS ring directly connected to the plasma membrane Present in some bacteria like Mycobacterium tuberculosis that makes up to 60% of the cell wallĪcid fast bacteria have lipids connected to peptidoglycan layer therefore, lipoprotein content is lowĭue to presence of outer layer, lipoprotein content is high Present in outer membrane that helps in the diffusion of small hydrophilic molecules Pink or red colored observed when examined under the microscope after Gram’s staining which accepts the counterstain safranin by the cell wall of gram negative bacteria after decolourization step.Ĭocci or spore forming rods Gram positive cocci: Streptococcus pneumonia, Staphylococcus aureus, Enterococcus Gram positive rods: Corynebacterium diphtheria, Listeria monocytogenes, Bacillus anthracis, Erysipelothrix rhusiopathiaeĬocci or non-spore forming rods Gram negative cocci: Neisseria gonorrhoeae, Neisseria meningitides, Moraxella catarrhalis, Haemophilus influenza Gram negative rods: Escherichia coli, Yersinia pestis, Salmonella Typhi/Paratyphi, Salmonella, Shigella, Proteus Purple or blue colored is observed when examined under the microscope after Gram’s staining which is due to the retaining of crystal violet dye by the cell wall of gram positive bacteria Gram positive cell wall are more rigid due to cross linkage of peptidoglycan chains Outer membrane is mostly present with a unique component, lipopolysaccharide (LPS) with proteins and phospholipids Outer membrane is absent but are surrounded by thick layers of peptidoglycan Periplasmic space is present between the region of cytoplasmic and outer membrane There is no presence of periplasmic space Teichoic acid is present within the cell wall Peptidoglycan layer is thin and are often single layered Peptidoglycan layer is thick up to 90% and are multilayered Cell wall of gram positive bacteria is 20 to 80 nanometer thickĬell wall of gram negative bacteria is 8 to 10 nanometer thin
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |