Dictionary » A » Aberrations


Aberration, spherical

(Science: optics) a lens defect whereby image forming rays of one colour, passing through the outer zones of a lens come to focus at a different distance from the lens than do those of more central rays.

With a simple spherical (or plano-spherical) lens the outer rays always meet the axis closer to the lens than do more central rays and the lens is uncorrected or undercorrected. When the reverse is true the lens has been overcorrected.

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

Results from our forum

Examples of Mutations ?

... I would like to see examples of mutations that affect and change the facial features. Until now I only see examples of changes in pigmentation or aberrations. So if anyone has photos of mutations in the face of an animal (but which are not aberrations) I like to see them. Thank you.

See entire post
by Goldentiger
Fri Jun 27, 2014 2:43 pm
Forum: Zoology Discussion
Topic: Examples of Mutations ?
Replies: 4
Views: 2263

Plant chromosome staining

Hi everyone, Can you please tell me what is the best stain to observe plant chromosomes and their aberrations (specially in onion cells) ? Feulgen stain or Aceto orcein? And are there any other suitable stains? Thank you very much

See entire post
by Sue4
Sat Apr 20, 2013 8:10 am
Forum: Cell Biology
Topic: Plant chromosome staining
Replies: 0
Views: 1727

Staining Chromosomes

Hi, Can you please tell me what is the best stain to observe plant chromosomes that allows to see chromosomal aberrations clearly. For an example onion chromosomes. Thank you

See entire post
by Sue4
Wed Apr 17, 2013 3:44 pm
Forum: Molecular Biology
Topic: Staining Chromosomes
Replies: 1
Views: 1914

Molecular gene (genome) concept scientifically untenable

... provides evidence of cell-induced mutation [24]. There are several mechanisms such as crossing over (recombination) during meiosis, chromosomal aberrations like deletion, replication, translocation and translocation, non-disjunction, cell divisions (mitosis and meiosis), etc., which are dismissed ...

See entire post
by PAWahid
Wed May 02, 2012 4:54 am
Forum: Molecular Biology
Topic: Molecular gene (genome) concept scientifically untenable
Replies: 12
Views: 38927

Aberrations in replication of e.coli?

... and can't find anything to help me out on this problem. Any help would be appreciated. Suggest the possible cause of each of the following aberrations during replication in E. coli: 1. Accumulation of Okazaki fragments. 2. The presence of RNA in newly synthesized DNA strand. 3. Many mismatched ...

See entire post
by LunaMoon7
Mon May 23, 2011 6:50 pm
Forum: Genetics
Topic: Aberrations in replication of e.coli?
Replies: 1
Views: 2807
View all matching forum results

This page was last modified 21:16, 3 October 2005. This page has been accessed 2,727 times. 
What links here | Related changes | Permanent link