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Companion cells - definition from Biology-Online.org
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Companion cells

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Transport in phloem of gymnosperms

... Taiz's Plant physiology. Sieve tubes in the phloem of angiosperms have companion cells, gymnosperms do not Gymnosperms have Strassburger's (albumin) cells in secondary phloem, ...

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by SU_reptile
Sun Nov 12, 2006 7:52 am
 
Forum: Botany Discussion
Topic: Transport in phloem of gymnosperms
Replies: 2
Views: 889

Transport in phloem of gymnosperms

... I can think of is that Sieve tubes in the phloem of angiosperms have companion cells, gymnosperms do not. so the process may just be slower :? otherwise its the same is it ...

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by Linn
Thu Nov 09, 2006 4:53 am
 
Forum: Botany Discussion
Topic: Transport in phloem of gymnosperms
Replies: 2
Views: 889

The Fiber Disease

... "Hereditary disorders may affect any blood cells or plasma proteins. For many hereditary blood diseases, the biochemical ... kinase deficiency was the first biochemical defect characterized in companion animals, and hemophilia B was the first molecular defect determined ...

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by Skytroll
Thu Jul 20, 2006 3:15 pm
 
Forum: Human Biology
Topic: The Fiber Disease
Replies: 7403
Views: 748694

about plants anatomy

... we still need a control tower somewhere to direct things. Dont we? some cells can function w/o nuclei, but they are subject to chemical signals from other cells with nuclei? that is what companion cells job is? what about prokaryote cells? did I spell that right? how ...

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by Linn
Mon Feb 20, 2006 5:27 pm
 
Forum: Botany Discussion
Topic: about plants anatomy
Replies: 9
Views: 1198

about plants anatomy

The phloem contains sieve tubes made up of elongated cells that have lost thier nucleus and most of thier cytoplasmic organelles,. ... from a long sieve column . in addition to sieve tubes , the phloem contains companion cells next to the sieve tubes that are connected transversally with ...

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by BLaZe
Mon Feb 20, 2006 3:31 pm
 
Forum: Botany Discussion
Topic: about plants anatomy
Replies: 9
Views: 1198
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