gram-positive

(adjective)

that is stained violet by Gram's method due to the presence of a peptidoglycan cell wall

Related Terms

  • sacculus
  • stromatolite
  • indel

Examples of gram-positive in the following topics:

  • Basic Structures of Prokaryotic Cells

    • Bacteria are divided into two major groups: gram-positive and gram-negative, based on their reaction to gram staining.
    • Gram-positive organisms typically lack the outer membrane found in gram-negative organisms .
    • Bacteria are divided into two major groups: gram-positive and gram-negative.
    • Both groups have a cell wall composed of peptidoglycan: in gram-positive bacteria, the wall is thick, whereas in gram-negative bacteria, the wall is thin.
    • In gram-positive bacteria, lipoteichoic acid anchors the cell wall to the cell membrane.
  • The Origins of Archaea and Bacteria

    • Archaea are believed to have evolved from gram-positive bacteria and can occupy more extreme environments.
    • Within prokaryotes, archaeal cell structure is most similar to that of gram-positive bacteria, largely because both have a single lipid bilayer and usually contain a thick sacculus of varying chemical composition.
    • In phylogenetic trees based upon different gene/protein sequences of prokaryotic homologs, the archaeal homologs are more closely related to those of Gram-positive bacteria.
    • Archaea and gram-positive bacteria also share conserved indels in a number of important proteins, such as Hsp70 and glutamine synthetase.
    • It has been proposed that the archaea evolved from gram-positive bacteria in response to antibiotic selection pressure.
  • Endosymbiotic Theory and the Evolution of Eukaryotes

    • More recent work proposes that gram-negative bacteria, which are unique within their domain in that they contain two lipid bilayer membranes, did result from an endosymbiotic fusion of archaeal and bacterial species .
    • More controversial is the proposal that (a) the eukaryotic nucleus resulted from the fusion of archaeal and bacterial genomes; and that (b) Gram-negative bacteria, which have two membranes, resulted from the fusion of Archaea and Gram-positive bacteria, each of which has a single membrane.
  • Concept of Osmolality and Milliequivalent

    • One mole is defined as the molecular weight of the solute in grams.
    • For example, the molecular weight of sodium chloride is 58.44; thus, one mole of sodium chloride weighs 58.44 grams.
  • Water’s High Heat Capacity

    • Specific heat is defined as the amount of heat one gram of a substance must absorb or lose to change its temperature by one degree Celsius.
  • Productivity within Trophic Levels

    • For example, in the English Channel ecosystem, the primary producers account for a biomass of 4 g/m2 (grams per meter squared), while the primary consumers exhibit a biomass of 21 g/m2.
  • Water’s Heat of Vaporization

    • As a result of the network of hydrogen bonding present between water molecules, a high input of energy is required to transform one gram of liquid water into water vapor, an energy requirement called the heat of vaporization.
  • Importance of Carbohydrates

    • Calorie-wise, a gram of carbohydrate provides 4.3 Kcal.
  • History of Bacterial Diseases

    • The causative agent, the (b) bacterium Yersinia pestis, is a gram-negative, rod-shaped bacterium from the class Gamma Proteobacteria.
    • Salmonella enterica serovar typhi, the causative agent of typhoid fever, is a gram-negative, rod-shaped gamma protobacterium.
  • Food Requirements and Essential Nutrients

    • Fatty foods are also significant sources of energy because one gram of fat contains nine calories.
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