What is a Winogradsky column used for?
The columns were invented by Winogradsky as a way to enrich for microbes from sediments and soils. Enrichment means to grow specific types of organisms to very large population sizes, much larger than they are normally found in nature.
Who discovered Winogradsky column?
Sergei Winogradsky
What purpose does calcium sulfate serve in the Winogradsky column?
Calcium sulfate acts as a source for sulfur. It also serves as an electron acceptor for the sulfate reducers which will generate sulfide at the bottom of the column, making it a suitable environment for the growth and propagation of anaerobic microorganisms.
Which among the following develops in the upper portion of Winogradsky column?
12. Which among the following develop in the upper portion of the Winogradsky column? Explanation: The aerobic sulfur-metabolizing bacteria, Thiobacillus sp.., develop in the upper portion of the column and oxidize reduced sulfur compounds.
Is cyanobacteria aerobic or anaerobic?
The majority of cyanobacteria are aerobic photoautotrophs. Their life processes require only water, carbon dioxide, inorganic substances and light.
Which among the following is a non Sulphur purple bacteria?
I. Introduction to the Purple Non-Sulfur Photosynthetic Bacteria.
| group of bacteria | chlorophylls |
|---|---|
| Anoxygenic PhotosyntheticBacteria | |
| Purple Sulfur Bacteria of the Family Chromatiaceae | bchl a or b |
| Purple Sulfur Bacteria of the FamilyEctothiorhodospiraceae | bchl a or b |
| Purple Non-Sulfur Bacteria (FamilyRhodospirillaceae*) | bchl a or b |
Which of the following comes under the category of positive association?
6. Which of the following comes under the category of positive association? Explanation: The phenomenon of commensalism is a positive type of association because it refers to a relationship between organisms in which one species of a pair benefits, the other is not affected.
What is it called when rod shaped bacteria appears in pairs?
diplobacilli
Which one of the following shows the relationship between two variables?
A scatterplot is a type of data display that shows the relationship between two numerical variables. Each member of the dataset gets plotted as a point whose x-y coordinates relates to its values for the two variables.
Which of the following bacteria is pleomorphic?
The genera Corynebacterium and Coccobacillus have been designated as a pleomorphic genera, diphtheroid Bacilli have been classified as pleomorphic nosocomial bacteria.
What is the shape of pleomorphic bacteria?
The three basic bacterial shapes are coccus (spherical), bacillus (rod-shaped), and spiral (twisted), however pleomorphic bacteria can assume several shapes. Cocci (or coccus for a single cell) are round cells, sometimes slightly flattened when they are adjacent to one another.
What is a pleomorphic virus?
Virus pleomorphism can be defined by the irregularity of particles from the same virus species, i.e., the variation of size and shape as well as the protein copy number that constitute the virus particle.
What is pleomorphic shape?
(PLEE-oh-MOR-fik) Occurring in various distinct forms. In terms of cells, having variation in the size and shape of cells or their nuclei.
Why mycoplasma is called pleomorphic?
Important characteristics of mycoplasmal bacteria Cell wall is absent and plasma membrane forms the outer boundary of the cell. Due to the absence of cell wall these organisms can change their shape and are pleomorphic.
What is the difference between polymorphism and Pleomorphism?
Polymorphism means the co-existence of two or more different forms in the same cell. Lysosomes are polymorphic means they have different size and internal structure. Pleomorphism means the occurrence of more than one structural form during the whole life cycle of a cell or an organism.
Where is Mycoplasma found in the body?
The primary habitats of human and animal mycoplasmas are the mucous surfaces of the respiratory and urogenital tracts and the joints in some animals. Although some mycoplasmas belong to the normal flora, many species are pathogens, causing various diseases that tend to run a chronic course (Fig. 37-4).
What is the best antibiotic for mycoplasma?
In the treatment of mycoplasmal pneumonia, antimicrobials against M pneumoniae are bacteriostatic, not bactericidal. Tetracycline and erythromycin compounds are very effective. The second-generation tetracyclines (doxycycline) and macrolides are the drugs of choice.
What kills mycoplasma?
There are three classes of antibiotics that kill mycoplasma when used at relatively low concentrations: tetracyclines, macrolides and quinolones. Tetracyclines and macrolides block protein synthesis by interfering with ribosome translation, whereas quinolones inhibit replication of mycoplasma DNA.
Is mycoplasma a bacteria or virus?
What is Mycoplasma pneumoniae infection? Mycoplasma pneumoniae is a type of bacteria. It often causes a mild illness in older children and young adults, but it can also cause pneumonia, an infection of the lung. The bacteria usually cause an upper respiratory tract infection with a cough and sore throat.
What type of cell is Mycoplasma?
Mycoplasmas are prokaryotic organisms that have no cell walls. They are members of the class Mollicutes, which has one order, Mycoplasmatales. The order has three families, each with one genus: Mycoplasmataceae, genus Mycoplasma, Acholeplasmataceae, genus Acholeplasma, and Spiroplasmataceae, genus Spiroplasma.
Can mycoplasma be cured?
What is the treatment for mycoplasma infection? Antibiotics such as erythromycin, clarithromycin or azithromycin are effective treatment. However, because mycoplasma infection usually resolves on its own, antibiotic treatment of mild symptoms is not always necessary.
Is Mycoplasma smaller than virus?
He says the smallest we know of is a parasitic bacterium called Mycoplasma genitalium. It’s about one five-thousandth of a millimeter in diameter. Conrad: And some viruses can be much smaller, even, say, ten times smaller—like, poliovirus is one of the smallest virues.