BDELLOVIBRIO BACTERIOVORUS PDF

Bdellovibrio bacteriovorus: HD, J Description and significance Bdellovibrios were discovered by Stolp and Petzhold in , in an attempt to isolate bacteriophage from soil samples. Stolp and Petzhold observed unique plaques in their samples that took several days to develop and continued to grow for over a week, instead of plaques caused by bacteriophages that would appear within hours. A closer inspection of the plaques under a light microscope revealed cells that were small, highly motile, and vibrio-shaped. These cells were Bdellovibrios. After the discovery of Bdellovibrios further observations revealed many interesting and unique properties. One property that makes Bdellovibrios interesting is that it is a parasite to other Gram-negative bacterias.

Author:Zuran Sarr
Country:Burundi
Language:English (Spanish)
Genre:Automotive
Published (Last):8 September 2004
Pages:90
PDF File Size:4.84 Mb
ePub File Size:8.70 Mb
ISBN:223-3-69109-627-7
Downloads:10395
Price:Free* [*Free Regsitration Required]
Uploader:Zule



Bdellovibrio bacteriovorus: HD, J Description and significance Bdellovibrios were discovered by Stolp and Petzhold in , in an attempt to isolate bacteriophage from soil samples. Stolp and Petzhold observed unique plaques in their samples that took several days to develop and continued to grow for over a week, instead of plaques caused by bacteriophages that would appear within hours.

A closer inspection of the plaques under a light microscope revealed cells that were small, highly motile, and vibrio-shaped. These cells were Bdellovibrios. After the discovery of Bdellovibrios further observations revealed many interesting and unique properties. One property that makes Bdellovibrios interesting is that it is a parasite to other Gram-negative bacterias. Bdellovibrios have biphasic life-cycles that include an attack phase, and a free living and mobile phase.

The complete genome consists of a single circular chromosome that is 3,, nucleotides long. These enzymes are necessary for B. Some of these enzymes need to be secreted out of B. Therefore, the genome of B. In fact, B. These gene clusters are essential for the motility B. However, the organism sheds its flagellum once it makes irreversible contact with its prey cell suggesting that the flagellum is not required for it to grow.

In the free-living or mobile phase, B. During the mobile phase, most of the metabolic activity is involved in motility and prey detection. A large variety of metabolic activities occur during this phase. After entry into the prey cell, B. One of these areas is that B. The reason for this is that B. It can break down or rearrange these precursors for the biosynthesis of homologous polymers.

The uptake of nucleoside monophosphates and glycerol phoshphates greatly reduces the amount of energy that B. There has also been evidence that B. Experiments have shown that the energy efficiency of B. They have been found in soil samples, rhizosphere of plant roots, rivers, oceans, sewage, intestines and feces of birds and mammals, and even in oyster shells and the gills of crabs.

Its optimal temperature is between C, making B. It can live in a range of salinity and is resistant to pollution of its environment. This makes B. It seems that the rich environment of biofilms supply B. Research has shown that B. Coli biofilm that is grown on stainless steel. It is a known pathogen to Gram-negative bacteria, making it a possible biocontrol agent to many human pathogens. Agriculturally, B. The use of B. Many experiments are performed to test how it specifically recognizes its prey.

There is also research on how B. It is also highly possible that a slight change in its genetic code can allow B. Prey Selection of B. This research showed that B.

3COM 3C16793 PDF

Killer-Bakterien als lebendes Antibiotikum?

Harini Department of Periodontics, A. Harini, Department of Periodontics, A. E-mail: moc. This article has been cited by other articles in PMC.

COMMUNICATION ELECTRONICS BY LOUIS FRENZEL PDF

Bdellovibrio

Bdellovibrio bacteriovorus[ edit ] The most well studied of these is Bdellovibrio bacteriovorus, which is found almost exclusively in host dependent growth in nature. The Bdellovibrio bacterium then forms a structure called a bdelloplast. This bdelloplast is created as the host cell is modified to become spherical in shape. Inside the bdelloplast, the singular large flagellum of the predatory Bdellovibrio is lost. The host cell is then rapidly killed allowing the passage of molecules from the interior of the host cytoplasm through to the periplasm freely, and the periplasm dwelling Bdellovibrio to feed. After around 4hrs, depending on ambient temperature, the Bdellovibrio has increased in size dramatically through this nourishment. The newly emerging Bdellovibrio use their newly grown powerful flagellar to swim away and find the next suitable host.

Related Articles