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Fixation

Fixation

1. (Science: orthopaedics) The act or operation of holding, suturing or fastening in a fixed position. The condition of being held in a fixed position.

2. (Science: psychiatry) a term with two related but distinct meanings: 1. Arrest of development at a particular stage, which like regression (return to an earlier stage), if temporary is a normal reaction to setbacks and difficulties but if protracted or frequent is a cause of developmental failures and emotional problems.

3. (Science: psychology) a close and suffocating attachment to another person, especially a childhood figure, such as one's mother or father. Both meanings are derived from psychoanalytic theory and refer to fixation of libidinal energy either in a specific erogenous zone, hence fixation at the oral, anal or phallic stage or in a specific object, hence mother or father fixation.

4. (Science: technique) The use of a fixative to preserve histological or cytological specimens.

5. (Science: chemistry) The process whereby a substance is removed from the gaseous or solution phase and localised, as in carbon dioxide fixation or nitrogen fixation.

6. (Science: ophthalmology) The direction of the gaze so that the visual image of the object falls on the fovea centralis.

7. (Science: chemistry) in film processing, the chemical removal of all undeveloped salts of the film emulsion, leaving only the developed silver to form a permanent image.

8. (Science: zoology) a general term for determination of type, whether by designation, or indication.

Origin: L. Fixatio


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I am having difficulty identifying this structure.

I think there would be some problems in your fixation step

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by mitochondrion
Fri Aug 15, 2014 9:37 am
 
Forum: Cell Biology
Topic: I am having difficulty identifying this structure.
Replies: 6
Views: 2015

Re:

... read the whole thing as I plan on passing out to sleep soon) However, if something is neither selected for or against, how did the mutations reach fixation? I suppose it could happen just by chance alone...but I'll have to read it to see their support. We have a limited follicle pool and therefore ...

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by badgertoes
Sat Dec 28, 2013 9:01 am
 
Forum: Evolution
Topic: Gender divison in two opposites is greatest mistake of manki
Replies: 25
Views: 17808

Metabolic Processes (Photosynthesis)

... effect of this practice on the environment. 26.Explain why herbicides have such a deadly effect on green plants. 27.Desert plants use CAM carbon fixation, in which carbon dioxide uptake occurs during the night. The carbon is then fixed for use in the daylight hours, when photosynthesis occurs. ...

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by Ninthprince
Tue Oct 22, 2013 1:38 am
 
Forum: Botany Discussion
Topic: Metabolic Processes (Photosynthesis)
Replies: 1
Views: 3409

Fixing CFSE labeled cells

... them all at once by flow cytometry. I was planning to fix the cells with 75% ethanol after collecting them. Is this possible / reliable? Or does fixation / storage affect the signal? And another thing, how sensitive is the CFSE signal to light? Do I have to wrap my 6-wells plate in aluminium ...

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by BiolMC
Tue Jun 11, 2013 12:34 pm
 
Forum: Cell Biology
Topic: Fixing CFSE labeled cells
Replies: 0
Views: 724

Carnoy's fixation problem

Hi everyone, What should be the original concentration of ethanol or methanol used in the preparation of Carnoy's fixative solution? I know it is alcohol: glacial acetic acid( 3:1). But what is the original concentration of the alcohol? Thank you very much :)

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by Sue4
Thu Apr 25, 2013 7:37 pm
 
Forum: Cell Biology
Topic: Carnoy's fixation problem
Replies: 0
Views: 1395
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