Is Merismopedia Gram positive or negative?
Merismopedia cells are gram-negative, blue-green in color. They grows as unicellular organisms in colonial form, reproducing in two fission planes to form plate-like colonies consisting of up to 4000 cells (Komárek).
What shape is Merismopedia?
spherical
Merismopedia (from the Greek merismos and the Greek pedion ) is a genus of cyanobacteria found in fresh and salt water. It is ovoid or spherical in shape and arranged in rows and flats, forming rectangular colonies held together by a mucilaginous matrix.
Does Merismopedia have Heterocysts?
Colonial structure: Cells align their long axis to the colony long axis. 1.2–6.5μm in diameter. Thylakoids are arranged parietally. Heterocysts: Absent.
Is Merismopedia colonial?
Merismopedia comprises flattened, free-living, platelike (rectangular), more or less rectangular colonies that have one layer of cells, arranged loosely or densely in perpendicular rows and enveloped by fine, colorless, usually indistinct, and marginally diffuse mucilage. Reproduction is by fragmentation of colonies.
What shape is Anabaena?
cylindrical
Cells are cylindrical or barrel shaped. The end cells are often much longer than mid-chain cells, and may be hyaline (having a glass-like appearance). Anabaena is one of four cyanobacteria genera that can produce toxins. Distribution: Common worldwide.
How do Merismopedia reproduce?
Merismopedia cells are gram-negative, blue-green in color. They grows as unicellular organisms in colonial form, reproducing in two fission planes to form plate-like colonies consisting of up to 4000 cells (Komárek). Reproducing specifically by fission, cell division occurs in two directions only (Manhattan).
What is the use of Oscillatoria?
It occur in fresh water ponds. Oscillatoria uses photosynthesis to survive and reproduce. Each filament of oscillatoria consists of trichome which is made up of rows of cells….
| Oscillatoria | |
|---|---|
| Phylum: | Cyanobacteria |
| Class: | Cyanophyceae |
| Order: | Oscillatoriales |
| Family: | Oscillatoriaceae |
Is Anabaena an algae or bacteria?
Anabaena, genus of nitrogen-fixing blue-green algae with beadlike or barrel-like cells and interspersed enlarged spores (heterocysts), found as plankton in shallow water and on moist soil.
What bacterial shape is Anabaena?
Cells are cylindrical or barrel shaped. The end cells are often much longer than mid-chain cells, and may be hyaline (having a glass-like appearance). Anabaena is one of four cyanobacteria genera that can produce toxins.
How is the Gram stain used in microbiology?
Use of the gram stain in microbiology The Gram stain differentiates bacteria into two fundamental varieties of cells. Bacteria that retain the initial crystal violet stain (purple) are said to be “gram-positive,” whereas those that are decolorized and stain red with carbol fuchsin (or safranin) are said to be “gram-negative.”
What does it mean when your Gram stain is red?
If the bacteria was colored pink or red, it means you likely have a Gram-negative infection. Your results will also include information about the shape of the bacteria in your sample. Most bacteria are either round (known as cocci) or rod-shaped (known as bacilli).
What causes Gram positive bacteria to stain Violet?
Gram positive bacteria stain violet due to the presence of a thick layer of peptidoglycan in their cell walls, which retains the crystal violet these cells are stained with. Alternatively, Gram negative bacteria stain red, which is attributed to a thinner peptidoglycan wall, which does not retain the crystal violet during the decoloring process.
How does a Gram positive bacteria look in a microscope?
If the bacteria is Gram positive, it will retain the primary stain (crystal violet) and not take the secondary stain (safranin), causing it to look violet/purple under a microscope. If the bacteria is Gram negative, it will lose the primary stain and take the secondary stain, causing it to appear red when viewed under a microscope.