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Barrier

Barrier

An obstruction.


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Speciation challenges the meaning of "beneficial mutation"

... that would indicate true divergence. Indeed, such variations could be present even before the population has been split up by a geographic barrier. Prior to a geographic split, there could have been A, B, and C variants, where only A and C variants were incompatible. While the B variants ...

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by wildfunguy
Sat Sep 28, 2013 11:11 pm
 
Forum: Evolution
Topic: Speciation challenges the meaning of "beneficial mutation"
Replies: 3
Views: 1077

plasmodesm and gap junction

... so they must be passed by plasmodesmata (with 20-40 nm diameter). As a result, every plant cell needs plasmodesmata but animal cells haven't any barrier like cell walls for protein transportation. So an animal cell necessarily doesn't have gap junction. But I'm not sure. Is it right? Any idea ...

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by mnatashgaran
Mon Apr 01, 2013 7:46 pm
 
Forum: Cell Biology
Topic: plasmodesm and gap junction
Replies: 1
Views: 1497

Sperm Immunity of Womens

... reaction against them. Therefore, mechanisms for their protection must exist in this organ to prevent any autoimmune reaction. The blood-testis barrier is likely to contribute to the survival of sperm. However, it is believed in the field of testicular immunology that the blood-testis barrier ...

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by ankitaalive
Wed Nov 28, 2012 6:28 am
 
Forum: Cell Biology
Topic: Sperm Immunity of Womens
Replies: 1
Views: 1771

Re: Recombinant DNA not degraded inside transformed cells, why?

... on time. Zhang G, Wang W, Deng A, Sun Z, Zhang Y, et al. (2012) A Mimicking-of-DNA-Methylation-Patterns Pipeline for Overcoming the Restriction Barrier of Bacteria. PLoS Genet 8(9): e1002987. doi:10.1371/journal.pgen.1002987 http://www.plosgenetics.org/article/info%3Adoi%2F10.1371%2Fjournal.pgen.1002987

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by jonmoulton
Fri Sep 28, 2012 6:18 pm
 
Forum: Genetics
Topic: Recombinant DNA not degraded inside transformed cells, why?
Replies: 10
Views: 3588

adherence to host cell-capsule hindrance

From what I understand about pathogenic microbiology, I think that the capsule will indeed act as a physical barrier. The host's complement system, which acts as a passive response against invading organisms, attracts phagocytes and is directly cytolytic on its own (via membrane ...

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by PsycoCarrot
Fri Jul 06, 2012 11:48 pm
 
Forum: Microbiology
Topic: adherence to host cell-capsule hindrance
Replies: 1
Views: 2867
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