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Topic: Xylem

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  Xylem - Wikipedia, the free encyclopedia
In vascular plants, xylem is one of the two types of transport tissue in plants, phloem being the other one.
The word “xylem” is derived from classical Greek ξυλον, "wood", and indeed the best known xylem tissue is wood, though it is found throughout the plant.
Fossil plants with anatomically preserved xylem are known from the Silurian (more than 400 million years ago), and trace fossils resembling individual xylem cells may be found in earlier Ordovician rocks.
en.wikipedia.org /wiki/Xylem   (782 words)

 Xylem Tube EP - Wikipedia, the free encyclopedia
The Xylem Tube EP is an early EP by electronic music artist Richard D. James, commonly known by his pseudonym of Aphex Twin.
It was his second release under the Aphex Twin alias on RandS Records of Belgium, the alias he used for all of his releases on this label.
Xylem Tube EP was released exclusively on vinyl in June 1992.
en.wikipedia.org /wiki/Xylem_Tube_EP   (200 words)

 Xylem - Search Results - ninemsn Encarta
Xylem, woody tissue, found in vascular plants, that conducts water and inorganic salts throughout the plant and provides it with mechanical support....
The xylem consists of two types of conducting cells with tracheids and vessel elements.
The vascular tissue system consists of two kinds of conducting tissues: the xylem, responsible for conduction of water and dissolved mineral...
au.encarta.msn.com /Xylem.html   (125 words)

 Botany online: Supporting Tissues - Vascular Tissues - Xylem
The xylem is the principal water-conducting tissue of vascular plants.
It consists of tracheary elements, tracheids and wood vessels and of additional xylem fibres.
Xylem and phloem together form a continuous system of vascular tissue extending throughout the plant.
www.biologie.uni-hamburg.de /b-online/e06/06b.htm   (856 words)

Xylem started as a hobby and a necessity for two handy college students.
Xylem is the vascular tissue of trees that provides support and transports water and minerals upward from the roots.
The layering of xylem from year to year produces annual growth rings in trees resulting in the unique grain and individual characteristics of each type of wood.
www.xylemonline.com   (252 words)

 Xylem found Swiftly
Xylem Design is pleased to bring you the finest quality pedestals and display bases on the...
Xylem, which does not contain living material, transports water and dissolved mineral salts from the roots...
Xylem and phloem are tissues found in vascular bundles.
www.nsalg.co.uk /gardening/xylem.html   (328 words)

 Biology4Kids.com: Plants: Xylem and Phloem
The xylem of a plant is the system of tubes and transport cells that circulates water and dissolved minerals.
Xylem is made of vessels that are connected end to end for the maximum speed to move water around.
Xylem tissue dies after one year and then develops anew (rings in the tree trunk).
www.biology4kids.com /files/plants_xylemphloem.html   (380 words)

 Xylem   (Site not responding. Last check: 2007-10-21)
Xylem is a complex tissue composed of xylem vessels, xylem tracheids, xylem fibres and xylem parenchyma.
The cells are arranged end to end and the cross-walls dissolve completely or have simple or complex perforation plates between successive cells.
Xylem fibres are sometimes separated by thin cross walls and the walls of xylem parenchyma are sometimes thicker than those of normal parenchyma.
www.botany.uwc.ac.za /SCI_ED/grade10/plant_tissues/xylem.htm   (199 words)

 BioMed Central | Full text | Analysis of xylem sap proteins from Brassica napus
It has been shown that xylem protein patterns change in response to infection by pathogenic fungi [15,19] and there are indications that interactions between proteins and pathogens within the xylem vessels, at least partly, determine the grade of resistance or susceptibility of tomato plants towards the vascular wilt pathogen Fusarium oxysporum [15].
The secretion of proteins into xylem sap is, like for other apoplastic proteins, most likely mediated by an amino-terminal signal peptide [21,22], which has been detected in the sequences of most of the thus far known xylem sap proteins [12,16,18,19].
For the other proteases identified from the xylem sample nothing, except from the facts that they all contain specific protease domains and that they contain a secretion pathway sequence, explaining their presence in the xylem, is known.
www.biomedcentral.com /1471-2229/5/11   (5202 words)

 Water and Mineral Transport
Once in the xylem, water with the minerals that have been deposited in it (as well as occasional organic molecules supplied by the root tissue) move up in the vessels and tracheids.
If sap in the xylem is under tension, we would expect the column to snap apart if air is introduced into the xylem vessel by puncturing it.
If the water in all the xylem ducts is under tension, there should be a resulting inward pull (because of adhesion) on the walls of the ducts.
users.rcn.com /jkimball.ma.ultranet/BiologyPages/X/Xylem.html   (1631 words)

Plants for xylem sap extraction are currently being grown in the greenhouse.
Xylem sap will be extracted multiple times post inoculation from Xf and water-inoculated plants.
In this research we investigate protein expression in xylem sap and stem tissue of highly tolerant and susceptible grape genotypes.
www.ars.usda.gov /research/publications/Publications.htm?seq_no_115=186594   (384 words)

 Xylem-1   (Site not responding. Last check: 2007-10-21)
Xylem and Phloem are the Vascular Tissues in MOST plants
Both Xylem and Phloem have cytological traits which distinguish them from the surrounding tissues.
Xylem and Phloem are said to be "complex tissues" because they contain Fibers and Parenchyma as well as Tracheary Elements (Xylem) and Sieve Elements (Phloem).
www.botany.hawaii.edu /faculty/webb/BOT311/BOT311-00/Xylem/Xylem-1.htm   (214 words)

Phloem is generally opposite the Xylem and nearer to the Epidermis.
The innermost xylem cells have the narrowest diameter.
The first cells to develop these secondary walls are those with the smallest diameters near the center of the stem.
www.biologie.uni-hamburg.de /b-online/library/webb/BOT311/Xylem/Xylem-6.htm   (96 words)

 Xylem Hydraulics and the Soil-Plant-Atmosphere Continuum: Opportunities and Unresolved Issues -- Sperry et al. 95 (6): ...
Xylem dysfunction during winter and recovery of hydraulic conductivity in diffuse-porous and ring-porous trees.
The reliability of cryoSEM for the observation and quantification of xylem embolisms and quantitative analysis of xylem sap in situ.
Architecture of branch-root junctions in maize: Structure of the connecting xylem and the porosity of pit membranes.
agron.scijournals.org /cgi/content/full/95/6/1362   (5708 words)

 BBC - GCSE Bitesize - Biology | Green plants | The transport system
Xylem consists of dead cells with no end walls, which contain
Together xylem and phloem form the vascular tissue, often also referred to as the
Water is taken up the plant from the roots to the leaves (for photosynthesis and transpiration) - in xylem vessels.
www.bbc.co.uk /schools/gcsebitesize/biology/greenplantsasorganisms/1watertransportrev3.shtml   (531 words)

 Xylem-1   (Site not responding. Last check: 2007-10-21)
Cells in the Xylem have stained red for lignin.
Both Xylem and Phloem have cytological traits which distinguish them from the surrounding Ground Tissues.
The Lignified walls of the Tracheary Elements in the Xylem are the most distinctive of these.
www.botany.hawaii.edu /faculty/webb/BOT410/Xylem/Xylem-1.htm   (176 words)

 Amazon.com: xylem   (Site not responding. Last check: 2007-10-21)
Xylem Structure and the Ascent of Sap by Melvin T. Tyree and Martin H. Zimmermann (Hardcover - Aug 1, 2002)
Differentiation of xylem morphogenesis and regulation by Tomasz J Wodzicki (Unknown Binding - Jan 1, 1973)
Xylem anatomy and hydraulic conductance of Costa Rican Blechnum ferns by John Steven Veres (Unknown Binding - Jan 1, 1989)
www.amazon.com /s?ie=UTF8&search-alias=aps&keywords=xylem&page=1   (480 words)

 Short-term Changes in Xylem N Compounds in Lolium perenne Following Defoliation -- THORNTON and MACDUFF 89 (6): 715 -- ...
Nitrate in xylem fluid was analysed by ion
Values for the flux of NO in the xylem were derived by multiplying the appropriate mean rate of measured water loss by the appropriate best-fit curve of NO concentration in the xylem (Fig.
of the flux from the vacuole to the xylem of 2 µg
aob.oxfordjournals.org /cgi/content/full/89/6/715   (5072 words)

 GLOSSARY WXYZ   (Site not responding. Last check: 2007-10-21)
wood The inner layer of the stems of woody plants; composed of xylem.
xylem Tissue in the vascular system of plants that moves water and dissolved nutrients from the roots to the leaves; composed of various cell types including tracheids and vessel elements.
Plant tissue type that conducts water and nutrients from the roots to the leaves.
www.emc.maricopa.edu /faculty/farabee/BIOBK/BioBookglossWXYZ.html   (317 words)

 Tissue Types   (Site not responding. Last check: 2007-10-21)
The vascular tissues of higher plants (Kingdom Plantae) are divided into two sections: xylem and phloem.
Xylem functions in the transport of minerals from the soil up the plant.
In the spring sap flow of woody trees, however, the xylem briefly carries lots of sugars and other nutrients from root storage to "jump start" the production of leaves.
koning.ecsu.ctstateu.edu /Plant_Biology/tissuetypes.html   (522 words)

 Vulnerability to xylem cavitation and the distribution of Sonoran Desert vegetation -- Pockman and Sperry 87 (9): 1287 ...
Vulnerability to xylem cavitation and the distribution of Sonoran Desert vegetation
1996 Root and stem xylem embolism, stomatal conductance and leaf turgor in Acer grandidentatum populations along a soil moisture gradient.
1997 Xylem cavitation in roots and stems of Douglas fir and white fir.
www.amjbot.org /cgi/content/full/87/9/1287   (6003 words)

 ARS | Publication request: CHARACTERIZATION AND IDENTIFICATION OF PD RESISTANCE MECHANISMS: ANALYSIS OF XYLEM ...   (Site not responding. Last check: 2007-10-21)
This may be related to the concentration and presence or absence of chemical compounds in the xylem sap and/or due to structural features of the xylem.
Xylem vessel blockages account for differences in the number and kinds of occlusions among four different Vitis genotypes.
This may be related to the concentration and presence or absence of chemical compounds in the xylem sap and/or due to anatomical features of the xylem.
www.ars.usda.gov /research/publications/Publications.htm?seq_no_115=186596   (422 words)

 Citadel Architectural Products, Inc. - CleanCote® Xylem®
CleanCote® Xylem® is a composite panel for interior use made by laminating an
However, Xylem® is ideal for other applications where a durable and easily maintained
CleanCote® Xylem features moldings that are nearly flat to the panel face reducing the
www.citadelap.com /cleancotexylem.htm   (179 words)

 Home Page
Xylem Company has been supplying metals to the medical device industry since 1962 when we supplied MP-35N wire for use in the production of coils or leadwires for the first implantable pacemakers.
Xylem is the botanical term describing the vascular network in plants which delivers nutrients from the roots to the leaves.
In this capacity, the activities of Xylem Company resemble those of xylem tissue.
www.xylemcompany.com   (288 words)

 XYLEM   (Site not responding. Last check: 2007-10-21)
XYLEM [Fristensky, (1993) NAR 21:5997-6003] is a package of tools designed to exploit the Unix environment to enable the user to identify, extract and manipulate data from major databases such as GenBank, EMBL and PIR.
XYLEM is compatible with the Fristensky Sequence Analysis Package, and the Pearson FASTA programs [Pearson and Lipman, (1988) PNAS 85:2444-2448], and can be used from within the Genetic Data Environment (GDE) of Steven Smith [Smith et al.
XYLEM 1.8.3 (June 5, 1998) Source Code and Documentation (388k)
home.cc.umanitoba.ca /~psgendb/XYLEM.html   (331 words)

 Great Plant Escape - Plant parts
Then the food produced by the leaves moves to other parts of the plant.
The cells that do this work are called the xylem cells.
Stems also provide support for the plant allowing the leaves to reach the sunlight that they need to produce food.
www.urbanext.uiuc.edu /gpe/case1/c1facts2b.html   (66 words)

 Xylem   (Site not responding. Last check: 2007-10-21)
There are two types of sclerenhyma conducting cells in the xylem, the tracheids and vessel elements.
The term tracheary element is sometimes used to refer to these cell types.
Note the primary xylem (next to pith), secondary xylem, and the vascular rays.
www.nsci.plu.edu /~jmain/b359web/pages/xylem.htm   (42 words)

 High Affinity Amino Acid Transporters Specifically Expressed in Xylem Parenchyma and Developing Seeds of Arabidopsis -- ...
the xylem are about 10-fold lower than in the phloem sap (7),
cells to mediate the described xylem to phloem transfer.
Blue staining is visible in cells directly adjacent to the xylem.
www.jbc.org /cgi/content/full/277/47/45338   (5253 words)

 Xylem Development Index Page - Botanical Society of America's Online Image Collection
Vesicles occur near the surface of the exposed wall.
Protoplast of differentiating vessel member with part of end wall.
Section through xylem region of a vascular bundle drawn from electron micrographs.
www.botany.org /plantimages/XylemDevelopment.php   (92 words)

 Xylem Easels, Art Easel
If you have been looking for a cheap easel that really isn’t like a cheap easel, than a Xylem artist easel is for you.
Choose from two great artist easels, either the Xylem Instant easel which is a great metal display easel or the Xylem Tabletop easel which is a wooden art easel.
The Xylem Table Top easel is perfect for kids or those of us who still act like one!
www.cheapjoes.com /art-supplies/4608_xylem-easels.asp   (187 words)

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