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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.


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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

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by Sue4
Sat Apr 20, 2013 8:10 am
 
Forum: Cell Biology
Topic: Plant chromosome staining
Replies: 0
Views: 1064

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

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by Sue4
Wed Apr 17, 2013 3:44 pm
 
Forum: Molecular Biology
Topic: Staining Chromosomes
Replies: 1
Views: 1267

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 ...

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by PAWahid
Wed May 02, 2012 4:54 am
 
Forum: Molecular Biology
Topic: Molecular gene (genome) concept scientifically untenable
Replies: 12
Views: 20500

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 ...

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by LunaMoon7
Mon May 23, 2011 6:50 pm
 
Forum: Genetics
Topic: Aberrations in replication of e.coli?
Replies: 1
Views: 2404

Re: Ethidium

... and you can feel tingeling as skin absorbs it.. Here's also an article you may find useful.. Acrylamide; induction of DNA damage, chromosomal aberrations and cell transformation without gene mutations. The genotoxic potential of acrylamide monomer (AA), a compound familiar as a raw material ...

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by zami'87.
Thu Dec 17, 2009 12:42 pm
 
Forum: Molecular Biology
Topic: Ethidium
Replies: 5
Views: 3629
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