dictionary help| gram-negative | medical dictionary |
<microbiology> A common class of bacteria normally found in the gastrointestinal tract that can be responsible for disease in man (sepsis).
Bacteria are considered to be gram-negative because of their characteristic staining properties under the microscope, where they either do not stain or are decolourised by alcohol during Gram's method of staining.
This is a primary characteristic of bacteria that have a cell wall composed of a thin layer of peptidoglycan covered by an outer membrane of lipoprotein and lipopolysaccharide containing endotoxin.
The gram staining characteristics of bacteria have resulted in an important classification system for the identification of bacteria.
See: gram-positive
(06 Oct 1997)
gramme machine, gram-metre, gram-molecular weight, gram-molecule < Prev | Next > gram-negative aerobic bacteria
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| gram-negative aerobic bacteria | medical dictionary |
<microbiology> A large group of aerobic bacteria which show up as pink (negative) when treated by the gram-staining method.
(12 Dec )
gram-molecular weight, gram-molecule, gram-negative < Prev | Next > gram-negative aerobic rods and cocci
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| gram-negative aerobic rods and cocci | medical dictionary |
<microbiology> A group of gram-negative bacteria consisting of rod- and coccus-shaped cells.
They are both aerobic (able to grow under an air atmosphere) and microaerophilic (grow better in low concentrations of oxygen) under nitrogen-fixing conditions but, when supplied with a source of fixed nitrogen, they grow as aerobes.
(12 Dec )
gram-molecule, gram-negative, gram-negative aerobic bacteria < Prev | Next > gram-negative anaerobic bacteria, gram-negative anaerobic cocci
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| gram-negative anaerobic bacteria | medical dictionary |
<microbiology> A large group of anaerobic bacteria which show up as pink (negative) when treated by the gram-staining method.
(12 Dec )
gram-negative aerobic bacteria, gram-negative aerobic rods and cocci < Prev | Next > gram-negative anaerobic cocci
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| gram-negative anaerobic cocci | medical dictionary |
<microbiology> A group of anaerobic coccoid bacteria that show up as pink (negative) when treated by the gram-staining method.
(12 Dec )
gram-negative aerobic rods and cocci, gram-negative anaerobic bacteria < Prev | Next > gram-negative anaerobic straight, curved, and helical rods
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| gram-negative anaerobic straight, curved, and helical rods | medical dictionary |
<microbiology> A group of anaerobic, rod-shaped bacteria that show up as pink (negative) when treated by the gram-staining method.
(12 Dec )
gram-negative anaerobic bacteria, gram-negative anaerobic cocci < Prev | Next > gram-negative bacteria, gram-negative bacterial infections
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| gram-negative bacteria | medical dictionary |
<microbiology> Bacteria which lose crystal violet stain but are stained pink when treated by gram's method.
(12 Dec )
gram-negative anaerobic cocci, gram-negative anaerobic straight, curved, and helical rods < Prev | Next > gram-negative bacterial infections
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| gram-negative bacterial infections | medical dictionary |
<microbiology> Infections caused by bacteria that show up as pink (negative) when treated by the gram-staining method.
(12 Dec )
gram-negative anaerobic straight, curved, and helical rods, gram-negative bacteria < Prev | Next > gram-negative chemolithotrophic bacteria
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| gram-negative chemolithotrophic bacteria | medical dictionary |
<microbiology> A large group of bacteria including those which oxidise ammonia or nitrite, metabolise sulphur and sulphur compounds, or deposit iron and/or manganese oxides.
(12 Dec )
gram-negative anaerobic straight, curved, and helical rods, gram-negative bacteria, gram-negative bacterial infections < Prev | Next > gram-negative facultatively anaerobic rods
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| gram-negative facultatively anaerobic rods | medical dictionary |
<microbiology> A large group of facultatively anaerobic, rod-shaped bacteria that show up as pink (negative) when treated by the gram-staining method.
(12 Dec )
gram-negative bacterial infections, gram-negative chemolithotrophic bacteria < Prev | Next > gram-negative oxygenic photosynthetic bacteria, gram-positive
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| gram-negative oxygenic photosynthetic bacteria | medical dictionary |
<microbiology> Widely distributed unicellular or multicellular bacteria. The cyanobacteria use chlorophyll a and phycobilins for oxygenic photosynthesis while genera in the prochlorales use both chlorophyll a and b but not phycobilins.
(12 Dec )
gram-negative chemolithotrophic bacteria, gram-negative facultatively anaerobic rods < Prev | Next > gram-positive, gram-positive asporogenous rods
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