64 results found

Search Results for: gram-negative

Gram-negative

Definition adjective Of, or relating to the group of bacteria that take the color of the counterstain (i.e. pink) under the... Read More

Eubacteria

Eubacteria are prokaryotic microorganisms consisting of a single cell lacking a nucleus and containing DNA is a single... Read More

Cell wall

The cell is the structural, functional, and biological unit of all organisms. It is a membrane-bound structure containing... Read More

Gram-indeterminate bacteria

Definition noun, singular: gram-indeterminate bacterium Bacteria that do not respond to gram staining and, therefore, are... Read More

Bacteria

Bacteria Definition What are bacteria? What is the definition of bacteria in biology? Bacteria are defined as organisms... Read More

Gram-positive endospore-forming rods

Definition noun A group of rod-shaped bacteria that are positive to Gram's method and form... Read More

Gram-positive cocci

Definition noun, singular: gram-positive coccus A group of spherical bacteria that retains the violet stain following gram... Read More

Gram-positive bacilli

Definition noun, singular: gram-positive bacillus A group of rod-shaped bacterial cells that appears violet through Gram's... Read More

Gram-positive bacteria

Definition noun, singular: gram-positive bacterium A group of bacterial cells that retains the violet colour following ... Read More

Gram staining

Definition noun A staining method performed to determine whether a bacterial species is gram-positive (i.e. violet stain) or... Read More

Anaerobic bacteria

Bacteria are classified according to the need for oxygen to survive and grow.   For example, aerobic bacteria are bacteria... Read More

Cross-linking

Cross-linking Definition Cross-linking, in general, means the forming of cross-links between the joining structures. In... Read More

Aerobic bacteria

Aerobic Bacteria Definition What does aerobic mean in biology? As the name suggests, 'aerobe' in biology means organisms... Read More

Escherichia coli

Definition A Gram-negative, facultatively anaerobic, rod-shaped species belonging to the family... Read More

Primary cell wall

Definition noun plural: primary cell walls ˈpɹaɪməɹi sɛl wɔːl The layer of the plant cell wall that forms prior to... Read More

Secondary cell wall

Definition noun plural: secondary cell walls ˈsɛkənˌdɛɹi sɛl wɔːl The layer of the plant cell wall that forms... Read More

Middle lamella

Definition noun plural: middle lamellae ˈmɪdəl ləˈmɛl.ə A pectin-rich intercellular material that glues the... Read More

Facultative anaerobe

Facultative Anaerobe Definition What does facultative anaerobe mean? Facultative organisms are the most adaptable... Read More

Differential stain

Definition noun The dye or stain that is used to differentiate one component or cellular structure from another, or to... Read More

Counterstain

Definition noun The dye or stain that is used to differentiate one component or cellular structure from another, or to... Read More

Cell membrane

Cell Membrane Definition Just like any non-living body possesses a plastic or paper packaging material that keeps the... Read More

Prokaryote

Prokaryote refers to any of the group of living organisms primarily characterized by the lack of a true nucleus and other... Read More

Brevibacillus brevis

Definition noun A motile aerobic ellipsoidal spore forming rod organisms involved in gramicidin production an antimicrobial... Read More

Obligate aerobe

Before we define obligate aerobes, let us first understand and define aerobic organisms. Aerobic organisms are those that... Read More

Cell morphology

The basic essence for any living organism is its structural framework which includes appearance, form, and the... Read More

Peptidoglycan

Definition noun, plural: peptidoglycans (1) A glycan (a polysaccharide) attached to short cross-linked oligopeptides in the... Read More

Serratia marcescens

Definition Noun A gram-negative motile and non-endospore forming rod bacterium associated with hospital acquired infections... Read More

Exogenous pyrogen

Definition noun, plural: exogenous pyrogen A type of pyrogen that is of microbial origin, such as the lipopolysaccharide in... Read More

Enterobacteriaceae

Definition noun: (taxonomy) A family of gram-negative bacilli that inhabit the large intestine of humans and other... Read More

Protoplasm

Definition noun plural: protoplasms pro·to·plasm, ˈprəʊtəˌplæzəm The fluid living content of the cell that... Read More

Transmembrane protein

Definition noun, plural: transmembrane proteins A protein that spans the entire biological... Read More

Exotoxin

Exotoxin (Science: protein) toxin released from gram-positive and gram-negative bacteria as opposed to endotoxins that form... Read More

Antibiotic

Definition noun, plural: antibiotics Antimicrobial agent made from microorganisms, and can kill and inhibit the growth of... Read More

Murein

Definition noun A crystal lattice structure in the cell wall of eubacteria formed by the linear chains of two alternating... Read More

Unicellular

Unicellular organisms are organisms consisting of one cell only that performs all vital functions including metabolism,... Read More

Microbe

Microbe Definition What is a microbe? How do we define microbes?  Microbes refer to microorganisms that cannot be seen by... Read More

Vibrio cholerae

Definition Noun A gram-negative single polar flagellum bacterium associated with cholera infection in... Read More

Capsule

Definition noun, plural: (general) A small case, envelope, or covering. (anatomy) (1) A membranous sac or integument,... Read More

Salmonella typhimurium

Definition A gram-negative pathogenic bacterium associated in gastroenteritis in humans and other... Read More

Neisseria flavescens

Definition Noun A gram-negative saprophytic bacterium found normally in the nasopharynx, mouth and upper respiratory tracts... Read More