Dictionary » G » Gram-negative

Gram-negative

Gram-negative

(Science: microbiology) a common class of bacteria normally found in the gastrointestinal tract that can be responsible for disease in man (sepsis).

bacteria are considered to be gram-negative because of their characteristic staining properties under the microscope, where they either do not stain or are decolourised by alcohol during grams method of staining.

this is a primary characteristic of bacteria that have a cell wall composed of a thin layer of peptidoglycan covered by an outer membrane of lipoprotein and lipopolysaccharide containing endotoxin.

The gram staining characteristics of bacteria have resulted in an important classification system for the identification of bacteria.

See: gram-positive


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



Results from our forum


Re: Food to ATP energy?

... bit Math-intense, but I'll try to summarize at the end (I think I answered the bulk of your issue above): The molecular weight of glucose is ~180 grams/mol. That means one mole of glucose weighs 180 grams. One mole of glucose could, at 100% efficiency (theoretical yield) be converted into about ...

See entire post
by tmbirkhead
Thu Aug 14, 2014 1:11 am
 
Forum: Cell Biology
Topic: Food to ATP energy?
Replies: 2
Views: 641

How is Mycoplasma a gram positive bacteria

Despite the lack of a cell wall, many taxonomists have classified Mycoplasma and relatives in the phylum Firmicutes, consisting of low G+C Gram-positive bacteria such as Clostridium, Lactobacillus, and Streptococcus based on 16S rRNA gene analysis.

See entire post
by erangasts2
Thu Aug 14, 2014 12:25 am
 
Forum: Microbiology
Topic: How is Mycoplasma a gram positive bacteria
Replies: 2
Views: 2735

Recommendations for Bacteria Detection?

... present in the water. I'm not as interested in particular species as I am in obtaining some idea of "bacteria density" or parts per gram. I'm not sure if it matters, but the water may be contaminated with fertilizer, soaps, etc... Is there some kind of quick test that can help me ...

See entire post
by lodestone25
Sun Jul 27, 2014 6:20 pm
 
Forum: Microbiology
Topic: Recommendations for Bacteria Detection?
Replies: 1
Views: 368

Streptococcus sanguis??

Hey guys have i correctly matched up my micro - organism? Gram reaction:+ Shape: cocci Acid-fast: - Spores: - Motility: - Grows in air: + Grows anaerobically: + Catalase: - Oxidase: - Acid from glucose: + OF test: : F Gas from glucose: - Acid from sucrose: ...

See entire post
by microbiologyhelp
Fri Dec 20, 2013 10:08 pm
 
Forum: Microbiology
Topic: Streptococcus sanguis??
Replies: 1
Views: 2113

ID OF UNKNOWN?!?!

Hey guys, I'm needing help trying to identify my organism in microbiology classes, so far the results obtained indicate Gram reaction:+ Shape: cocci Acid-fast: - Spores: - Motility: - Grows in air: + Grows anaerobically: + Catalase: - Oxidase: - Acid from glucose: + OF test: : F Gas ...

See entire post
by microbiologyhelp
Fri Dec 06, 2013 10:59 am
 
Forum: Microbiology
Topic: ID OF UNKNOWN?!?!
Replies: 5
Views: 3354
View all matching forum results

This page was last modified 21:16, 3 October 2005. This page has been accessed 19,099 times. 
What links here | Related changes | Permanent link