Structure and Genome of Measles Virus

Structure of Measles Virus Measles virus is the prototypic member of the Morbillivirus genus of the family Paramyxoviridae. Measles virus is a spherical with a diameter ranging from 120 to 1000 nm and has two major structural components: one is the helical ribonucleoprotein (RNP) core formed by the association of the nucleoprotein (N), phosphoprotein (P) and large … Read moreStructure and Genome of Measles Virus

Biochemical Test of Streptococcus agalactiae

Biochemical Test of Streptococcus agalactiae

Biochemical Test of Streptococcus agalactiae Basic Characteristics Properties (Streptococcus agalactiae) CAMP Positive (+ve) Capsule Positive (+ve) Catalase Negative (-ve) Coagulase Negative (-ve) Flagella Non-flagellated Gram Staining Positive (+ve) Hemolysis Beta Hemolysis Motility Non-motile OF (Oxidative-Fermentative) Facultative anaerobes Oxidase Negative (-ve) PYR Negative (-ve) Shape Cocci Spore Non-sporing Urease Negative (-ve) VP (Voges Proskauer) Variable Fermentation … Read moreBiochemical Test of Streptococcus agalactiae

Culture media used in Microbiology with their uses

Culture media used in Microbiology with their uses

A7 and A8 agars A7 and A8 agars are selective and differential media used for the cultivation, identification, and differentiation of Ureaplasma spp. and Mycoplasma hominis.   Alkaline peptone water Alkaline peptone water is an enrichment broth used for the isolation of small numbers of Vibrio and Aeromonas organisms from stool specimens.   American Trudeau … Read moreCulture media used in Microbiology with their uses

Lassa Virus

Lassa Virus

Structure of Lassa Virus The virus is a single-stranded RNA virus belonging to the virus family Arenaviridae. Figure: Structure of Lassa Virus, Source: Swiss Institute of Bioinformatics The virion is spherical particles with an average diameter of 90–110 nm. Lassa virus is a single-stranded RNA virus that is enveloped in lipid with glycoprotein spikes protruding from … Read moreLassa Virus

Crimean-Congo Hemorrhagic Fever Virus

Crimean-Congo Hemorrhagic Fever Virus

Structure of Crimean-Congo Hemorrhagic Fever Virus Crimean Congo hemorrhagic fever virus falls under the family Bunyaviridae and genus Nairo virus. They are spherical particles 90 to 120 nm in diameter with 5-10 nm projections visible on the surface. Figure: Crimean‐Congo hemorrhagic fever virus structure. Source: DOI: 10.3892/br.2015.545 They are enveloped virus which comprises of two glycoproteins (G1 … Read moreCrimean-Congo Hemorrhagic Fever Virus

Biochemical Test of Yersinia pestis

Biochemical Test of Yersinia pestis

Biochemical Test of Yersinia pestis Basic Characteristics Properties (Yersinia pestis) Capsule Positive (+ve) Catalase Positive (+ve) Citrate Negative (-ve) Flagella Non-Flagellated Gas Negative (-ve) Gelatin Hydrolysis Negative (-ve) Gram Staining Negative (-ve) Growth in KCN Negative (-ve) H2S Negative (-ve) Hemolysis Negative (-ve) Indole Negative (-ve) Motility Non-Motile MR (Methyl Red) Positive (+ve) Nitrate Reduction … Read moreBiochemical Test of Yersinia pestis

Biochemical Test of Enterobacter cloacae

Biochemical Test of Enterobacter cloacae ­Basic Characteristics Properties (Enterobacter cloacae) Capsule Negative (-ve) Catalase Positive (+ve) Citrate Positive (+ve) Flagella Positive (+ve) Gas from glucose Positive (+ve) Gelatin Hydrolysis Negative (-ve) Gram Staining Negative (-ve) Growth in KCN Positive (+ve) H2S Negative (-ve) Indole Negative (-ve) Motility Motile MR (Methyl Red) Negative (-ve) Nitrate Reduction … Read moreBiochemical Test of Enterobacter cloacae

Biochemical Test of Bacillus anthracis

Biochemical Test of Bacillus anthracis

Biochemical Test of Bacillus anthracis ­Basic Characteristics Properties (Bacillus anthracis) Capsule Capsulated Catalase Positive (+ve) Gas Negative (-ve) Gelatin Hydrolysis Positive (+ve) Gram Staining Positive (+ve) Hemolysis Negative (-ve) Indole Positive (+ve) Motility Negative (-ve) Nitrate Reduction Positive (+ve) Oxidase Negative (-ve) Pigment Negative (-ve) Shape Rods Spore Positive (+ve) Urease Negative (-ve) VP (Voges … Read moreBiochemical Test of Bacillus anthracis

Human Astrovirus

Human Astrovirus

Structure of Human Astrovirus Human astrovirus falls under Astroviridae and genus Mamastrovirus. The particles are round in shape, 28 nm in diameter with a smooth margin and display a five or six pointed star motif on their surface.The term astrovirus (Greek: astron- star) was coined to refer this feature. They are non-enveloped, spherical, capsid of about … Read moreHuman Astrovirus

Gram-positive cell wall

Gram-positive cell wall

Prokaryotic cells almost always are bounded by a fairly rigid and chemically complex structure present between the cell membrane and capsule/slime layer called the cell wall. Peptidoglycan is the main component of the cell wall and is responsible for the shape and strength of the cell. It is a disaccharide and contains two sugar derivatives—N-acetylglucosamine … Read moreGram-positive cell wall