Lab 3: morphological characteristics of bacteria protocols for endospore stain, capsule stain, motility stab and wet mount introduction bacteria are characterized by the presence or absence of a number of different. The bacterial morphology and staining properties of the organism, as well as o2 growth requirements of the species combined with a variety of biochemical tests for clinicians the environmental reservoir of the. Let's suppose we have two bacterial smears containing mixture of staphylococcus aureus and escherichia colithe organisms are heat fixed by passing an air-dried smear of the organisms through the flame of a gas burner.
Bacteria are classified by direct examination with the light microscope according to their morphology and arrangement the basic forms are spheres (coccus) and round-ended cylinders (bacillus. The three most common bacterial cell shapes are cocci (spherical, from the greek word for seed/berry), bacilli (rod-shaped, from the greek word for staff), and spirilla (curved shape, from spiral. School of science: institute of biotechnology episode 01: bacterial cell morphology.
The genus streptococcus , a heterogeneous group of gram-positive bacteria, has broad significance in medicine and industry various streptococci are important ecologically as part of the normal microbial flora of animals and humans some can also cause diseases that range from subacute to acute or even chronic. Bacterial morphology • cocci - spherical / oval shaped major groups • bacilli - rod shaped • vibrios - comma shaped • spirilla - rigid spiral forms • spirochetes - flexible spiral forms. Morphology of a bacterial cell: morphology of a bacterial cell size shape & arrangement anatomical structures - cell wall - cell membrane - cytoplasm - slime layer & capsule appendages- flagella & fimbriae spores. Cell morphology is essential in identifying the shape, structure, form, and size of cells in bacteriology, for instance, cell morphology pertains to the shape of bacteria if cocci, bacilli, spiral, etc and the size of bacteria. When a single bacterial cell is deposited on a solid nutrient medium, it begins to divide one cell makes two, two makes four, four make eight eventually a visible mass of cells, a colony, appears.
T/f: gram positive bacteria are easier to kill with antibiotics while gram negative bacteria are easier to kill with hand-sanitizing alcohol rub porphyromonas gingivalis this rod-shaped bacteria has a thick capsule and is a common cause of periodontitis. These are abnormal forms derived from bacteria of abnormal morphology (cocci, bacilli, vibrio) due to variation in the laboratory they lack rigid cell wall, they are viable, grow and multiply on suitable culture media. Microbewiki is a free wiki resource on microbes and microbiology, authored by students at many colleges and universities.
Examination of the form and structure of bacterial colonies is termed colony morphology and is one of the first steps in characterizing and identifying a bacterial culture colony morphology. Bacterial colony morphology bacteria grow on solid media as colonies a colony is defined as a visible mass of microorganisms all originating from a single. Bacteria morphology lab report this report will detail how a similar project was performed in order to identify two unknown micobes using the techniques that were learnt during the course of the semester. The preceding images are the specimen at 40x, 100x and 1000x spirilla (coiled or wavy) move the slide the opposite direction (to the left), past the center specimen, carefully adjust for optimum lighting (this is the most difficult specimen to observe) and repeat the illustration process for the remaining specimen.
Microbiologists can also identify bacteria through their colony morphology, or the appearance and characteristics of the bacterial colony while arrangement refers to the groupings of individual cells, morphology describes the appearance of groups of bacteria, or colonies. Escherichia coli (commonly abbreviated e coli) is a gram-negative, rod-shaped bacterium that is commonly found in the lower intestine of warm-blooded organisms (endotherms) most e coli strains are harmless, but some serotypes can cause serious food poisoning in humans. Bacteria morphology questions and answers pdf free download in microbiology mcqs,interview questions,objective questions,multiple choice.