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Certain genera of Gram-positive bacteria, such as ..

Gram Positive Bacteria

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Basic Microbiology | Gram Positive Bacteria | Bacteria

It works faster for the purpose of differentiating in many conditions.

Characteristics
Apart from the effect of gram staining, both types of bacteria differ in various other characteristics.

Wall Structure: The main difference between them is the arrangement of the outer structure of the cell.

Effect of Dye: A crystal violet dye solution is added to the bacteria to find their type.

This antibiotic is still used for treating many gram-positive bacterial infections.

The expression “microorganisms” was customarily connected to all tiny, single-cell prokaryotes. In any case, atomic systematics indicated prokaryotic life to comprise of two separate areas, initially called Eubacteria and Archaebacteria, yet now called Bacteria and Archaea that developed autonomously from an antiquated basic ancestor. The archaea and eukaryotes are more firmly identified with each other than either is to the microscopic organisms. These two areas, alongside Eukarya, are the premise of the three-space framework, which is as of now the most generally utilized grouping framework in microbiology. However, because of the moderately late presentation of atomic systematics and a quick increment in the quantity of genome successions that are accessible, bacterial arrangement remains a changing and growing field. For instance, a couple of scientists contend that the Archaea and Eukaryotes developed from gram-positive bacteria.

Gram-positive bacteria: Possible photosynthetic ancestry

It is made up of close to twenty times the amount of peptidoglycan, which is present in gram negative bacteria.



are an organism that requires organic substrates to get its carbon for growth and development. Some are strictly aerobic, but many are facultative anaerobes (they can survive in either the presence or absence of oxygen).
Heterotrophic Bacteria are generally found in most over the counter aquarium cycling products (especially "Sludge Removers") due to their portability and quick activity.
Heterotrophs can be either gram-positive (ex: Bacillus) or gram-negative (ex: Pseudomonas) which in the case of Pseudomonas many gram negative aquarium treatments (such as Kanamycin) can be effective against Pseudomonas while not harming true Autotrophic nitrifying bacteria.

Another point is growth (which is why Heterotrophic bacteria are favored for cycling products); nitrifying (Autotrophic) bacteria will double in population every 15-24 hours under optimal growth conditions. Heterotrophic bacteria, on the other hand, can reproduce in as little as 15 minutes to 1 hour.
Unfortunately research has shown that up to one million times more of these heterotrophic bacteria are required to perform a comparable level of ammonia conversion that is attained by true autotrophic nitrifying bacteria, in part due to the fact of Heterotrophic Bacteria to convert many organics into food.

The use of Heterotrophic Bacteria to cycle an aquarium (or pond) can result in a bio environment that does not contain the necessary Autotrophic nitrifying bacteria to rapidly adapt to changes in bio load either from added fish, wastes, or similar; thus often resulting in sudden spikes in ammonia or nitrites when these Heterotrophic bacteria cycling products are not added in a timely or regular schedule!The other danger is cloudy water.

For this reason products that contain only Heterotrophic Bacteria such as "Hagen Cycle" or even the popular Eco-Complete planted substrate SHOULD BE AVOIDED in some aquariums!

Low pH and Nitrification ;

Nitrification involving AOB & NOB bacteria is different at pH levels of above 7.0 versus below 6.0.

Toxic Ammonia (NH3) changes to ammonium under 6.0 and ammonium (non toxic NH4) switches back to toxic NH3 over 7.0
until the nitrification process re-establishes itself at the higher pH

The cause of this change in the nitrification process is still not clearly understood.
From:


From the above article and quote, I would postulate that a change in Heterotrophic bacteria along with possible Redox Reactions or lack there of (a low pH below 6.0 is very oxidizing with little/no reduction which for this reason alone is not a healthy environment.
As well, Autotrophic bacterial adaptations may be part of this process and why there is an interruption in nitrification from changes in pH and between NH3 & NH4.
Since typical real world aquarium environments invariably are going to contain Heterotrophic bacteria (from fish food waste, etc.) and these tests seemed to lock out these Heterotrophic bacteria (using only ammonium chloride), this bacterium might be part of the cause.


During the nitrification process carbonates are used by the aquarium or pond to counter acids produced during nitrification (or other organic breakdown), however without an adequate KH (even for Amazon River Fish such as Discus or German Rams), subtle or even sudden changes in pH can occur that affects the nitrogen cycle
References:


Keeping a low pH/KH can be a double edged sword where by a simple procedure such as a water change with slightly higher pH water can result in an immediate conversion of ammonium (NH4) to deadly ammonia (NH3) with disastrous results.
This low pH, poor nitrifying environment also easily allows for the growth of pathogenic Fungi/Saprolegnia and a depressed Redox balance.

See References:

These carotenoids may be purple, red, brown or orange in colour and give the bacteria their characteristic
colouration.

Purple bacteria are Gram negatives and so possess a double membrane in the cell envelope.

Gram-Positive Bacteria | Microbiology

KW - Gram-positive bacteria

AB - The evolutionary position of the heliobacteria, a group of green photosynthetic bacteria with a photosynthetic apparatus functionally resembling Photosystem I of plants and cyanobacteria, has been investigated with respect to the evolutionary relationship to Gram-positive bacteria and cyanobacteria. On the basis of 16S rRNA sequence analysis, the heliobacteria appear to be most closely related to Gram-positive bacteria, but also an evolutionary link to cyanobacteria is evident. Interestingly, a 46-residue domain including the putative sixth membrane-spanning region of the heliobacterial reaction center protein shows rather strong similarity (33% identity and 72% similarity) to a region including the sixth membrane-spanning region of the CP47 protein, a chlorophyll-binding core antenna polypeptide of Photosystem II. The N-terminal half of the heliobacterial reaction center polypeptide shows a moderate sequence similarity (22% identity over 232 residues) with the CP47 protein, which is significantly more than the similarity with the Photosystem I core polypeptides in this region. An evolutionary model for photosynthetic reaction center complexes is discussed, in which an ancestral homodimeric reaction center protein (possibly resembling the heliobacterial reaction center protein) with 11 membrane-spanning regions per polypeptide has diverged to give rise to core of Photosystem I, Photosystem II, and of the photosynthetic apparatus in green, purple, and heliobacteria.

Gram positive and Gram negative bacteria have a different type of cell wall, and therefore, a different reaction to the dye and to some other chemicals, including antibiotics (chemicals that can sometimes kill bacteria).

Structure and substance of a run of the mill gram-positive bacterial cell (seen by the way that just a single cell layer is available).
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Gram negative bacteria stain pink ..

N2 - The evolutionary position of the heliobacteria, a group of green photosynthetic bacteria with a photosynthetic apparatus functionally resembling Photosystem I of plants and cyanobacteria, has been investigated with respect to the evolutionary relationship to Gram-positive bacteria and cyanobacteria. On the basis of 16S rRNA sequence analysis, the heliobacteria appear to be most closely related to Gram-positive bacteria, but also an evolutionary link to cyanobacteria is evident. Interestingly, a 46-residue domain including the putative sixth membrane-spanning region of the heliobacterial reaction center protein shows rather strong similarity (33% identity and 72% similarity) to a region including the sixth membrane-spanning region of the CP47 protein, a chlorophyll-binding core antenna polypeptide of Photosystem II. The N-terminal half of the heliobacterial reaction center polypeptide shows a moderate sequence similarity (22% identity over 232 residues) with the CP47 protein, which is significantly more than the similarity with the Photosystem I core polypeptides in this region. An evolutionary model for photosynthetic reaction center complexes is discussed, in which an ancestral homodimeric reaction center protein (possibly resembling the heliobacterial reaction center protein) with 11 membrane-spanning regions per polypeptide has diverged to give rise to core of Photosystem I, Photosystem II, and of the photosynthetic apparatus in green, purple, and heliobacteria.

During the process of Gram staining, Gram negative bacteria do not ..

This process is known as gram staining.

Effect of Antibiotics: Identification of bacterial type is imperative for the treatment of medical conditions, since different bacteria have differing responses to antibiotics like penicillin.

Flagellum: A flagellum is a hair-like structure, which is used by the bacteria for locomotion.

Teichoic Acids: They are strong acidic polymers found in the cell wall.

Are cyanobacteria gram positive? | Yahoo Answers

Their main function is to provide rigidity to this wall.

Liproproteins: Bacterial lipoproteins are a set of membrane proteins, which play an important role in various bacterial diseases caused by gram-negative and gram-positive bacteria.

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