Dictionary » B » Bacteria



noun, singular: bacterium

(Science: Microbiology)

Microscopic, single-celled organisms belonging to Kingdom Monera that possess a prokaryotic type of cell structure, which means their cells are noncompartmentalized, and their DNA (usually circular) can be found throughout the cytoplasm rather than within a membrane-bound nucleus. They reproduce by fission or by forming spores. They can practically live everywhere. They can inhabit all kinds of environment, such as in soil, acidic hot springs, radioactive waste, seawater, deep in the Earth's crust, in stratosphere, and even in the bodies of other organisms.


Bacteria belong to Kingdom Monera, together with Cyanobacteria (blue-green algae), which are also prokaryotic. Bacteria may be classified based on their shape: spherical (cocci), rod-like (bacilli), spiral (spirochetes), or comma-shaped (vibrios). Other ways of classifying them are based on whether or not they are: gram positive or gram negative, aerobic or anaerobic, autotrophic or heterotrophic, etc.

Although some of them produce infectious diseases on humans (e.g. including cholera, syphilis, anthrax, leprosy and bubonic plague) several other bacteria have been found beneficial. For example, bacteria in the gut aid in digestion. They’re also vital in recycling nutrients, such as the fixation of nitrogen from the atmosphere. Bacteria, often Lactobacillus in combination with yeasts and molds, have been used for thousands of years in the preparation of fermented foods such as cheese, pickles, soy sauce, sauerkraut, vinegar, wine and yoghurt.

Word origin: from Ancient Greek baktēria, “‘rod, stick’”.

Related forms: bacterial (adjective).
Related phrases: coliform bacteria, pathogenic bacteria, purple bacteria.

Synonym: eubacteria.
Compare: archaea.
See also: prokaryote.

Please contribute to this project, if you have more information about this term feel free to edit this page

Results from our forum

Xenobiotic Agents for Biofilm Prevention and Treatment

... key factors: (1) the extracellular matrix limits diffusion of molecules such as antibiotics, preventing them from readily accessing the target bacteria; (2) some bacteria within the biofilm are dormant, which diminishes the effectiveness of traditional antibiotics that kill actively metabolizing ...

See entire post
by bioCassie
Tue Mar 03, 2015 5:38 pm
Forum: Microbiology
Topic: Xenobiotic Agents for Biofilm Prevention and Treatment
Replies: 0
Views: 289

FISH and Taqman probes

I want to quantify bacteria , and this bacteria has been detected by using FISH probe(targets 16S). Can I use this FISH probe as my TaqMan probe and design the forward and reverse primers on the two sides of it?

See entire post
by 2444256703
Tue Mar 03, 2015 6:28 am
Forum: General Discussion
Topic: FISH and Taqman probes
Replies: 0
Views: 127

Methylene Blue Solution use in staining variety of bacteria?

... is used in various procedures such as the Ziehl-Neelsen, Fite's, and Gram stain. The stain is also suggested for use in staining a variety of bacteria (Corynebacterium diphtheria, Haemophilus influenzae, Neisseria, etc.) and leukocytes. This reagent produces dark blue nuclei with lighter blue ...

See entire post
by scytek
Sun Feb 22, 2015 9:22 am
Forum: General Discussion
Topic: Methylene Blue Solution use in staining variety of bacteria?
Replies: 0
Views: 308

Re: antibiotics vs antibacterial drugs..

... Waksman for substances produced by a microorganism which in low concentration inhibit the growth of some other cellular microorganisms (including bacteria and fungi etc but *not* viruses), but the restriction to biological sources has been abandoned by many users of the term. In any case, even ...

See entire post
by alQpr
Wed Feb 04, 2015 12:54 pm
Forum: Microbiology
Topic: antibiotics vs antibacterial drugs..
Replies: 4
Views: 7784

Taqman probe design using FISH probe (need help)

I’m a newcomer in this forum and in the world of qPCR and I need your help please. I want to quantify bacteria by using RT-PCR (Taqman), this bacteria has been detected (in previous study) by using FISH probe (targets 16S). Can I use this FISH probe (from the paper) as my ...

See entire post
by biomart
Wed Feb 04, 2015 7:10 am
Forum: Bioinformatics
Topic: Taqman probe design using FISH probe (need help)
Replies: 2
Views: 581
View all matching forum results

This page was last modified 02:33, 22 July 2008. This page has been accessed 175,594 times. 
What links here | Related changes | Permanent link