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Molecule

Definition

noun, plural: molecules

A tiny or a very small piece (of something).

(biology or biochemistry) An extremely small particle or substance, especially at cellular or structural level, as a biomolecule.

(physics and chemistry) The smallest unit of an element or compound, made up of two or more atoms held together by strong chemical bond.


Supplement

In physics and chemistry, a molecule is an electrically neutral, group of atoms that can exist alone in free state while its characteristic properties are retained. The atoms comprising the molecule may be of the same kind (as in oxygen molecule made up of two oxygen atoms) or of different kinds (such as water molecule made up of oxygen and hydrogen).

In biology, particularly in biochemistry, a molecule is used less strictly that it can also refer to any minute particle such as charged organic molecules or to substances (called biomolecules) produced and occur naturally in living organisms such as proteins, carbohydrates, DNA, etc.


Word origin: French molécule, from New Latin mōlēcula, diminutive of Latin mōlēs, mass.
Related forms: molecular (adjective)

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Re:

usually 1 nm and higher. Size of atoms (C, N) is 70 pm and smaller. That's 20-times less. However, you may be interested in the new one-molecule sequencing methods. And separation of chromosomes by dissection by laser is also nothing new. This is not a problem again. After scanning slices ...

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by enarees
Wed Feb 26, 2014 6:57 pm
 
Forum: Microbiology
Topic: Slicing frozen chromosomes with lasers and scanning with SEM
Replies: 4
Views: 246

Slicing frozen chromosomes with lasers and scanning with SEM

usually 1 nm and higher. Size of atoms (C, N) is 70 pm and smaller. That's 20-times less. However, you may be interested in the new one-molecule sequencing methods. And separation of chromosomes by dissection by laser is also nothing new.

See entire post
by JackBean
Wed Feb 26, 2014 9:33 am
 
Forum: Microbiology
Topic: Slicing frozen chromosomes with lasers and scanning with SEM
Replies: 4
Views: 246

Dating of blood stains

... new kind of procedure. We thought about a few things (if you have other ideas, please please let us know!): ⋅ Try to seperate the HbO2 molecule from the met-HB molecule (the difference is just Fe2+/Fe3+) using ion chromatography (or some kind of chromatography) and detect them. (Maybe ...

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by wptmdoorn
Tue Jan 28, 2014 12:32 pm
 
Forum: Human Biology
Topic: Dating of blood stains
Replies: 1
Views: 514

Diffusion and concentration gradient

... been mentioned a lot in other systems as well) but what intrigues me is that the concentration gradient can be different for several types of molecules in the SAME environment. I don't get that... For example, in the alveoli, dioxygen molecules get into the capillaries because O2 concentration ...

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by Aymeric
Sun Dec 15, 2013 1:02 am
 
Forum: General Discussion
Topic: Diffusion and concentration gradient
Replies: 7
Views: 2488

Re: Number of water molecules produced by cellular respiration

... In that powerpoint they show that the aldolase enzyme executing a reverse aldol condensation that consumes one water molecule per Dihydroxyacetone produced during the splitting of one fructose 1,6 bis phosphate. So with the 2 consumed during citrate formation we are ...

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by thornthor
Sun Nov 03, 2013 7:00 pm
 
Forum: Cell Biology
Topic: Number of water molecules produced by cellular respiration
Replies: 8
Views: 9196
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