PPT-2. Gram-positive bacteria are coloured

purple because they take up the stain crystal violet a Their cell walls are made of one thick layer of carbohydrate and protein molecules 3 Gramnegative bacteria are coloured . A. Introduction – There are multiple criteria by which you can classify an organism. 1. Metabolic Activities (Carbon, Energy & Oxygen sources). A) Recall that microbes may vary in their carbon & energy sources. Part-2. Sulfur Dioxide(SO2) and Sulfites(SO3). Sulfur dioxide, Sodium sulfite(Na2SO3), Sodium bisulfide(NaHSO3), and Sodium . metabisulfite. (Na2S2O5) are used to control microorganisms and insects in soft fruits, lemon juices, beverages, sausages, pickles, and fresh shrimp.. How does natural selection change . a population?. P. 247-248 What are the five important principles of natural selection? . P. 250 . What are two sources of variation? . What is a niche? . P. 258 - 259. Last day. Brief . introduction to bacteria, . Archaebacteria. , and bacterial culturing media. . Today. We will start by looking at our cultures, and providing colony descriptors. . We . will learn about the Biology of Bacteria. A. Introduction – There are multiple criteria by which you can classify an organism. 1. Metabolic Activities (Carbon, Energy & Oxygen sources). A) Recall that microbes may vary in their carbon & energy sources. Biology and Biotechnology department. Differential . stain separate bacteria into group . . Gram . Stain :. Differentiate bacteria into 2 groups:. Gram . positive bacteria . Gram . negative bacteria . continued. Gram Stain. When bacteria are treated with a dye made up of crystal violet and iodine they react in one of two ways. . Bacteria . cells that appear purple are gram-positive and bacteria that change to pink are gram-negative. . 2. Prokaryote & Eukaryote. Evolution. 3. Cellular Evolution. Current evidence indicates that . eukaryotes evolved from prokaryotes. between 1 and 1.5 billion years ago. Two theories:. 1. . Infolding theory. Lack a nucleus. DNA is naked, a single loop not bound in a chromosome. May contain plasmids (small circular fragments of DNA). Have ribosomes, but no other organelles.. DNA present as a long circular molecule.. “We learn . . . 10% of what we read, 20% of what we hear, 30% of what we see, 50% of what we see and hear, 70% of what we discuss, 80% of what we experience, 95% of what we teach others.”. ~ William Glasser. and . Function. Bacterial . Form . and Function. A. . Structures common to . all. bacterial cells. 1. . Cell membrane. 2. . Cytoplasm. 3. . Ribosomes. 4. . One (or a few) . chromosomes. Bacterial Form . Presenter: Dr. Mohammad Qadi. Introduction. Several studies evaluated resistance among . clinical. isolates in West Bank-Palestine .  . showed increasing and . alarming. rates of antimicrobial resistance . . . . . Dr.oruba. Khalid abbas. ACTINOMYCETES. In this lecture , we shall discuss 3 genera of actinomycetes: . Actinomyces, Nocardia. , and . Streptomyces.. . These organisms have been shown to be . 1078 1079 separated into two tubes; one tube contained anticoagulant for hematology studies, and in other tube without anticoagulant was used for serum separation and subsequent biochemical tests. Blo