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Sieve

sieve

1. A utensil for separating the finer and coarser parts of a pulverized or granulated substance from each other. It consist of a vessel, usually shallow, with the bottom perforated, or made of hair, wire, or the like, woven in meshes. In a sieve thrown and sifted.

2. A kind of coarse basket.

(Science: botany) Sieve cells, cribriform cells. See Cribriform.

Origin: OE. Sive, AS. Sife; akin to D. Zeef, zift, OHG. Sib, G. Sieb. A. Cf. Sift.


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Locus specificity and ERVs - Q from a creationist

... are there because they infected both species independently and were fixed by positive selection pressure. IOW, selection pressure acted as a 'sieve', retaining only the ERVs that served an adaptive function. (We cannot say that not all ERVs serve an adaptive function - it may be that we just ...

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by BarryDesborough
Sat Sep 07, 2013 2:49 pm
 
Forum: Genetics
Topic: Locus specificity and ERVs - Q from a creationist
Replies: 4
Views: 1138

How to Sieve a fly pupa from the sawdust

... with a bran.(i give them the barn as a food). After they are fat Enough I pot them in a sawdust till they become a pupa . So I got a problem with Sieve (i hope this is the correct word) the fly pupa from the sawdust and the bran. When I do it with a normal Sieve is come very dirty. And what I ...

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by bioptic
Sun Oct 09, 2011 4:35 pm
 
Forum: General Discussion
Topic: How to Sieve a fly pupa from the sawdust
Replies: 0
Views: 1152

Transport In Plants

... also (ALFIERI, F. J., and R. F. EVERT. 1968. Seasonal development of the secondary phloem in Pinus. Am. J. Bot. 55, 518-528.) It consists of sieve cells , sieve tube elements , phloem parenchyma and phloem fibres. There are also phloem ray cells. Xylem consists of the inner heartwood (the ...

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by kika
Tue Aug 02, 2011 10:40 am
 
Forum: Botany Discussion
Topic: Transport In Plants
Replies: 3
Views: 9518

Re: water movement in xylem

... Water naturally enters the roots and then carries the nutrients through the plant. It does the same thing with sugar. Water enters the plant's sieve-tubes and transports the sugar throughout the plant body . The tracheids, vessel elements, and sieve-cells are all lines with pits and have perforations ...

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by Ariamezzo
Sat Feb 26, 2011 11:46 am
 
Forum: Botany Discussion
Topic: water movement in xylem
Replies: 2
Views: 6313

epiphytic algae

... If you have an idea of what organism you are going to come across in these scrapings you could try separating based by size (i.e. sieve out organisms based on size. If you do this it will probably be easier to see the individual organisms. Also when are you observing your sample ...

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by Darwin420
Mon Dec 14, 2009 5:31 am
 
Forum: Microbiology
Topic: epiphytic algae
Replies: 3
Views: 4029
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