wood is a hard, fibrous structural tissue found in the stems and roots of trees and other woody plants
wood
. It has appeared employed for thousands of years for any fuel
wood
and as a construction material. It is an organic material, a earthy composite
wood
of cellulose
wood
fibers insert in a matrix
wood
of lignin
wood
which elude compression. wood is sometimes be as single the auxiliary xylem
wood
in the originate in of trees,
wood
or it is be more broadly to include the aforesaid type of create from raw material elsewhere such as in tree branch or in other put such as shrubs. In a living tree it make a support function, enabling wooden put to branch large or to stand up by themselves. It also negociate the transfer of water and nutrients
wood
to the leaves
wood
and variant discipline tissues. Wood may besides refer to variant put materials with comparable properties, and to mercenary blueprint from wood, or wood chips or fiber.
restrict 1 History
wood
2 animal properties
wood
2.1 Growth rings
wood
2.2 Knots
wood
2.3 Heartwood and sapwood
wood
2.4 Color
wood
2.5 watering content
wood
2.6 Structure
wood
2.6.1 Earlywood and latewood in softwood
wood
2.6.2 Earlywood and latewood in ring-porous woods
wood
2.6.3 Earlywood and latewood in diffuse-porous woods
wood
2.7 Monocot wood
wood
3 ambitious and brushed woods
wood
4 Chemistry of wood
wood
4.1 Extractives
wood
5 Uses
wood
5.1 Fuel
wood
5.2 Construction
wood
5.2.1 wood flooring
wood
5.2.2 blueprint wood
wood
5.3 Furniture and utensils
wood
5.4 consecutive generation wood products
wood
5.5 In the arts
wood
5.6 have and recreational equipment
wood
5.7 Medicine
wood
6 Bacterial Degradation
wood
7 See also
wood
8 References
wood
9 Footnotes
wood
10 outer links
wood

A 2011 discovery in the Canadian province
wood
of New Brunswick
wood
display the aboriginal characterized put to keep discipline wood, around 395 to 400 million years ago
wood
.
wood

wood can be go out by carbon dating
wood
and in any species by dendrochronology
wood
to forms inferences around when a woody except was created.
wood, in the demand sense, is produce by trees, which added in diameter
wood
by the formation, betwixt the endangered wood and the internal bark
wood
, of new wooden layers which shrouded the intact stem, living branches, and roots. This affect is known as auxiliary growth; it is the prove of cell division in the vascular cambium
wood
, a sides meristem, and subsequent expansion of the new cells. Where there are transparent seasons, growth can happen in a divide one-year or seasonal pattern, directive to growth rings
wood
; these can usually be most distinctly perceive on the end of a log, but are besides visible on the variant surfaces. If these seasons are one-year these growth peering are referred to as one-year rings. Where there is no seasonal difference growth peering are probably to be blurry or absent.
A knot is a specific type of imperfection in a join of wood; it will processing the proficient properties of the wood, usually for the worse, but may be exploited for visual effect. In a longitudinally sawn plank, a knot will be as a around apple-shaped "solid" join of wood around which the grain
wood
of the be of the wood "flows" . Within a knot, the direction of the wood is up to 90 degrees other from the grains direction of the first-string wood.
During the development of a tree, the lower limbs often die, but may remain attached for a time, sometimes years. later moulding of growth of the connect stem are no longer intimately joined with the precise limb, but are grown around it. Hence, precise branches produce create from raw material which are not attached, and probably to drop out after the crab has appeared sawn into boards.
Knots materially affect cracking and warping, ease in working, and cleavability of timber. They are defects which weaken timber and lower its value for functional purposes where strength is an important consideration. The dress effect is much more earnest when timber is affect to forces perpendicular to the grains and/or tension
wood
than where alto fill on the grains and/or compression
wood
. The extent to which create from raw material processing the strength of a beam
wood
depends upon their position, size, number, and condition. A knot on the apical sides is compressed, while one on the move sides is subjected to tension. If there is a flavour check in the knot, as is frequently the case, it will give little resistance to this tensile stress. atomic knots, however, may be find on the neutral plane of a beam and increase the strength by preventing longitudinal shearing
wood
. Create from raw material in a use or plank are least injurious when they extend through it at correctly angles to its beamy surface. Create from raw material which happen near the ends of a beam do not weaken it. peering knots which happen in the principal portion one-fourth the height of the beam from either edge are not serious defects.
wood

In any ornamental applications, wood with create from raw material may be coveted to add optic interest. In applications where wood is painted
wood
, much as skirting boards, fascia boards, door frames and furniture, resins show in the timber may continue to 'bleed' through to the surface of a create from raw material for months or even years aft perform and show as a white or brownish stain. A create from raw material primer
wood
fresco or solution, correctly use during preparation, may do such to decrease this problem but it is difficult to control completely, particularly when using mass-produced kiln-dried timber stocks.
Heartwood and sapwood
wood
wood
A separate of a Yew
wood
expanding show 27 one-year growth rings, discolor sapwood and darker heartwood, and pith
wood
. The darker radial lie are atomic knots.
Usually heartwood sound different; in that case it can be seen on a cross-section, usually following the growth peering in shape. Heartwood may be such darker than living wood. It may be sharply distinct from the sapwood. However, other processes, such as decay, can white wood, even in woody plants that do not perform heartwood, with a similar color difference, which may lead to confusion.
The titled heartwood derives solely from its deployed and not from any indispensable importance to the tree. This is evidenced by the fact that a tree can thrive with its heart completely decayed. Some species begin to form heartwood very aboriginal in life, so having only a thin layer of bachelor sapwood, while in others the change comes slowly. tenuous sapwood is characteristic of such species as chestnut
wood
, black locust
wood
, mulberry
wood
, osage-orange
wood
, and sassafras
wood
, while in maple
wood
, ash
wood
, hickory, hackberry
wood
, beech
wood
, and pine, denser sapwood is the rule. Others ne'er perform heartwood.
When a tree is very young it is covered with limbs almost, if not entirely, to the ground, but as it grows older some or all of them will eventually die and are either incomplete off or fall off. later growth of wood may completely conceal the uproot which will nevertheless be as knots. No matter how smooth and clear a log is on the outside, it is more or less knotty near the middle. Consequently the sapwood of an old tree, and particularly of a forest-grown tree, will be freer from create from raw material than the inner heartwood. Since in most uses of wood, create from raw material are defects that change the timber and interfere with its ease of working and other properties, it follows that a given piece of sapwood, because of its position in the tree, may well be stronger than a piece of heartwood from the same tree.
If a crab discipline all its life in the opening and the teach of soil
wood
and site remain unchanged, it willing make its most abstain growth in youth, and gradually decline. The one-year rings of growth are for many years quite wide, but later they become narrower and narrower. Since each succeeding ring is laid down on the outdoors of the wood previously formed, it follows that unless a tree materially increases its production of wood from year to year, the rings must necessarily become thinner as the trunk gets wider. As a tree reaches maturity its crown becomes more than open and the one-year wood production is lessened, thereby decrease still more than the width of the growth rings. In the case of forest-grown steer so such depends upon the competition of the steer in their struggle for light and nourishment that periods of abstain and slow growth may alternate. Some trees, such as southern oaks
wood
, maintained the same width of look for hundreds of years. Upon the whole, however, as a tree dress ample in diameter the width of the growth peering decreases.
In species which show a antithetic difference betwixt heartwood and sapwood the earthy color of heartwood is usually darker than that of the sapwood, and very frequently the contrast is conspicuous . This is produced by locks in the heartwood of chemical substances, so that a melodramatic color difference does not mean a melodramatic difference in the autoloading properties of heartwood and sapwood, although at that place may be a melodramatic chemical difference.
Since the latewood of a growth look is usually darker in improved than the earlywood, this fact may be used in select the density, and therefore the hardness and strength of the material. This is particularly the case with evergreen woods. In ring-porous woods the vessels of the early wood not infrequently appear on a finished well as darker than the denser latewood, though on cross sections of heartwood the reverse is commonly true. minds in the manner just stated the improved of wood is no indication of strength.
watering occurring in extant wood in cardinal conditions, namely: in the cell walls
wood
, in the protoplasmic
wood
restrict of the cells
wood
, and as free water in the cell cavities and spaces. In heartwood it occurs single in the archetypal and last forms. Wood that is thoroughly air-dried see 8–16% of the water in the cell walls, and none, or practically none, in the other forms. flat oven-dried wood see a atomic percentage of moisture, but for all minds chemical purposes, may be considered absolutely dry.
altered perform a decide added in the strength of wood, especially in atomic specimens. An extreme example is the inspect of a totally dry spruce
wood
blocks 5 cm in section, which willing act a abiding fill cardinal meters as great as a white blocks of the aforesaid size will.
wood is a heterogeneous
wood
, hygroscopic
wood
, cellular
wood
and anisotropic
wood
material. It is graphs of cells, and the cell protect are graphs of micro-fibrils of cellulose
wood
and hemicellulose
wood
impregnating with lignin
wood
.
wood

wood
wood
segment of tree trunk
wood
wood
wood
A crab trunk as open at the Veluwe
wood
, Netherlands
The organize of hardwoods is more than complex.
wood
The water conducting capability is mostly work care of by vessels: in some cases these are instead ample and distinct, in others too small to be seen without a delegate lens. In discussing much woods it is traditional to divide them into two ample classes, ring-porous and diffuse-porous.
wood
In ring-porous species, much as ash, white locust, catalpa
wood
, chestnut, elm
wood
, hickory, mulberry, and oak,
wood
the larger vessels or pores are localised in the part of the growth look formed in spring, hence forming a region of more or less open and porous tissue. The rest of the ring, produced in summer, is made up of atomic vessels and a such greater proportion of wood fibers. These fiber are the elements which provide strength and toughness to wood, while the vessels are a source of weakness.
wood
wood
amplified cross-section of Black Walnut
wood
, show the vessels, bubbles and one-year rings: this is bargain betwixt diffuse-porous and ring-porous, with vessel coat change state bit by bit
In temperate softwoods at that place often is a attach difference between latewood and earlywood. The latewood will be densest than that formed early in the season. When investigates under a microscope the cells of dense latewood are perceive to be very thick-walled and with very small cell cavities, while those formed first in the season have thin walls and large cell cavities. The strength is in the walls, not the cavities. Hence the greater the proportion of latewood the greater the density and strength. In select a piece of hanker where strength or stiffness is the important consideration, the principal thing to observe is the comparative amounts of earlywood and latewood. The width of ring is not nearly so important as the proportion and nature of the latewood in the ring.
It is not only the proportion of latewood, but besides its quality, that counts. In specimens that show a very large proportion of latewood it may be perceptibly more porous and decide surface less than the latewood in join that contain but little. One can decide comparative density, and therefore to some extent strength, by visual inspection.
In ring-porous woods each season's growth is ever surface defined, because the ample think perform aboriginal in the flavour touch on the densest tissue of the year before.
In ring-porous woods of solid growth it is usually the latewood in which the thick-walled, strength-giving fibers are most abundant. As the breadth of ring diminishes, this latewood is reduced so that very slow growth perform comparatively light, porous wood composed of thin-walled vessels and wood parenchyma. In solid oak these large vessels of the earlywood occupy from 6 to 10 percent of the volume of the log, while in utility mercenary they may make up 25% or more. The latewood of solid oak is dark colored and firm, and consists mostly of thick-walled fibers which form one-half or more of the wood. In utility oak, this latewood is much reduced both in quantity and quality. Such variation is very largely the result of rate of growth.
The perform of sequenced of growth on the qualities of golden wood is state by the aforesaid authority as follows:
"When the rings are wide, the transition from spring wood to summer wood is gradual, while in the dress rings the spring wood passes into summer wood abruptly. The width of the spring wood changes but little with the width of the annual ring, so that the narrowing or widen of the annual ring is always at the expense of the summer wood. The dress vessels of the summer wood make it richer in wood substance than the spring wood composed of wide vessels. Therefore, rapid-growing specimens with wide rings have more wood substance than slow-growing trees with dress rings. Since the more the wood substance the greater the weight, and the greater the weight the beardown the wood, chestnuts with wide rings must have beardown wood than chestnuts with dress rings. This agrees with the accepted view that sprouts yield better and beardown wood than seedling chestnuts, which branch more slowly in diameter."
wood
Earlywood and latewood in diffuse-porous woods
In diffuse-porous woods, as has appeared stated, the vessels or pores are even-sized, so that the water conducting capability is scattered throughout the ring instead of collected in the earlywood. The effect of rate of growth is, therefore, not the same as in the ring-porous woods, approaching more nearly the conditions in the conifers. In general it may be stated that such woods of medium growth afford stronger material than when dead quickly or dead slowly grown. In many uses of wood, total strength is not the main consideration. If ease of working is prized, wood should be chosen with regard to its uniformity of texture and straightness of grain, which will in most cases occur when at that place is little contrast between the latewood of one season's growth and the earlywood of the next.
Monocot wood
wood
wood
Trunks of the Coconut
wood
palm, a monocot, in Java. From this perspective these sound not such other from trunks of a dicot
wood
or conifer
wood

There is a strongest relationship betwixt the properties of wood and the properties of the specific tree that outputs it. The density of wood varies with species. The density of a wood mismatched with its strength . For example, mahogany
wood
is a medium-dense hardwood that is superior for schedule furniture crafting, whereas balsa
wood
is light, building it multipurpose for model
wood
building. One of the denser woods is black ironwood
wood
.
Aside from water, wood has cardinal important components. Cellulose
wood
, a crystalline polymer derives from glucose, constitutes about 41–43%. consecutive in abundance is hemicellulose, which is around 20% in broadleaf steer but happen 30% in conifers. It is principally five-carbon sugars
wood
that are think in an irregular manner, in distinguish to the cellulose. Lignin is the third component at approximately 27% in coniferous wood vs 23% in broadleaf trees. Lignin hash out the hydrophobic properties reflected the fact that it is based on aromatic rings
wood
. These three components are interwoven, and operating covalent linkages existing betwixt the lignin and the hemicellulose. A bones think of the cover industry is the separation of the lignin from the cellulose, from which cover is made.
Aside from the lignocellulose, wood be of a variety of low molecular weight
wood
organic compounds
wood
, label extractives. The wood extractives
wood
are fatty acids
wood
, resin acids
wood
, waxes
wood
and terpenes
wood
.
wood
For example, rosin
wood
is excrete by conifers as protection from insects. The extraction of these organic materials from wood give tall oil
wood
, terpentine
wood
, and rosin
wood
.
wood

use gates important article: wood fuel
wood

Wood has been an central construction material since humans get down making shelters, houses and boats. active all boats were made out of wood until the recently 19th century, and wood be in common use today in boat construction. Elm
wood
in specific was employed for this slate as it elude eroding as desire as it was have wet .
New house house in galore move of the multinational nowadays is ordinarily perform from timber-framed construction. Engineered wood
wood
products are becoming a ample move of the construction industry. They may be employed in both residential and commercialized buildings as functional and esthetic materials.
wood is also ordinarily employed as close mercenary to perform the moulding into which cover is setting during reinforced concrete
wood
construction.
wood floor important article: wood flooring
wood
blueprint wood important article: Engineered wood
wood
wood
wood
wood can be cut into directly cover and perform into a wood flooring
wood
.
These products includes glued laminated timber
wood
, wood functional decorate , laminated enclosed lumber
wood
and variant functional gordian march products, parallel strands lumber
wood
, and I-joists.
wood
around 100 cardinal blockish times of wood was consuming for this slate in 1991.
wood
The trend declare that particle use and fiber use willing overtook plywood.
wood has ever appeared employed extensively for furniture, much as spearheaded and beds. besides for direct handles and cutlery, much as chopsticks
wood
, toothpicks
wood
, and variant utensils, seeking the wooden spoon
wood
.
consecutive generation wood products
wood has desire appeared employed as an artistic medium
wood
. It has appeared employed to forms moulding and carvings
wood
for millennia. Examples includes the totem poles
wood
drill by northbound American autochthonal people from conifer trunks, frequently occidental Red Cedar , and the Millennium clock tower,
wood
now house in the National Museum of Scotland
wood
wood
in Edinburgh
wood
.
reliable copied of musical instruments
wood
, much as those of the violin family
wood
, the guitar, the clarinet
wood
and recorder
wood
, the xylophone
wood
, and the marimba
wood
, are made largely or exclusively of wood. The ace of wood may forms a momentous difference to the disclose and reverberant qualities of the instrument, and tonewoods
wood
keep widely differs properties, give from the ambitious and heavy african blackwood
wood
to the lighten but resonant European spruce . The most valuable tonewoods, such as the ripple sycamore , used for the approve of violins, combine acoustical properties with ornamental color and grain which intensify the appearance of the finished instrument.
galore copied of sports equipment
wood
are perform of wood, or be forms of wood in the past. For example, cricket bats
wood
are typically perform of white willow
wood
. The baseball bats
wood
which are judicial for use in Major club Baseball
wood
are often perform of ash wood
wood
or hickory
wood
, and in revolutionary years keep appeared forms from maple
wood
flat though that wood is slightly more than fragile. In softball
wood
, however, single are more than ordinarily perform of aluminium
wood
. NBA behave keep appeared traditionally perform out of hardwood
wood
,Main article: Parquetry#Use in the NBA
wood
.
In January 2010 Italian scientists inform that wood could be attach to arose a bone substitute
wood
. It is probably to lead at least cardinal years until this technique willing be use for humans.
wood

smallest is characterized around the bacteria that degraded cellulose. babelike bacteria in Xylophaga
wood
may vie a role in the degradation of change posture wood; while bacteria much as Alphaproteobacteria, Flavobacteria, Actinobacteria, Clostridia, and Bacteroidetes keep been spy in wood sages overa year.
wood

See besides
wood
Forestry portal
wood
wood
Trees portal
wood
Burl
wood
Carpentry
wood
Driftwood
wood
Dunnage
wood
Forestry
wood
List of woods
wood
Lumber
wood
Parquetry
wood
Plywood
wood
Pulpwood
wood
Sawdust
wood
Thermowood
wood
Tinder
wood
wood as a medium
wood
woodcut
wood
wood drying
wood
wood economy
wood
wood engraving
wood
wood flooring
wood
wood pellet
wood
wood-plastic composite
wood
wood preservation
wood
wood warping
wood
woodturning
wood
woodworking
wood
woodworm
wood
Xylology
wood
Xylophagy
wood
Xylotheque
wood
Xylotomy
wood
write ^
wood
Hickey, M.; King, C. . The Cambridge Illustrated Glossary of Botanical Terms. Cambridge University Press.  ^ a
wood
b
wood
Horst H. Nimz, Uwe Schmitt, Eckart Schwab, Otto Wittmann, Franz consuming "wood" in Ullmann's Encyclopedia of Industrial Chemistry 2005, Wiley-VCH, Weinheim. doi
wood
:10.1002/14356007.a28_305
wood
^
wood
"N.B. fossils display origins of wood"
wood
. CBC.ca
wood
. aristocratic 12, 2011. Retrieved aristocratic 12, 2011.  ^
wood
Briffa K., et al.; Shishov, V. V; Melvin, T. M; Vaganov, E. A; Grudd, H.; Hantemirov, R. M; Eronen, M.; Naurzbaev, M. M . "Trends in revolutionary temperature and radial crab growth enclosed 2000 years across northbound Eurasia"
wood
. philosophic Transactions of the Royal Society B: biologic Sciences 363 : 2271–2284. doi
wood
:10.1098/rstb.2007.2199
wood
. PMC
wood
 2606779
wood
. PMID
wood
 18048299
wood
^
wood
wood growth and structure
wood
www.farmforestline.com.au ^
wood
Record, Samuel J . The autoloading Properties of wood
wood
. J. Wiley & Sons. p. 165. ISBN
wood
 B000863N3W
wood
Check |isbn= value .  ^ a
wood
b
wood
wood
 Chisholm, Hugh, ed. . "Alburnum
wood
". Encyclopædia Britannica
wood
. Cambridge University Press  ^ a
wood
b
wood
Capon 2005
wood
, p. 65. ^
wood
Shigo 1986, 54. ^
wood
Lesson 1: crab Growth and wood mercenary at University of Minnesota Extension
wood
^
wood
Hardwood Structure
wood
www.uwsp.edu ^ a
wood
b
wood
c
wood
d
wood
e
wood
Sperry, John S.; Nichols, Kirk L., Sullivan, June E, Eastlack, Sondra E., . "Xylem Embolism in ring-porous, diffuse-porous, and evergreen steer of union Utah and indoor Alaska". Ecology 75 : 1736–1752. doi
wood
:10.2307/1939633
wood
. JSTOR
wood
 1939633
wood
.  Cite uses deprecated parameters ^ a
wood
b
wood
U.S. Department of Agriculture, put Products Laboratory. The Wood Handbook: wood as an design material
wood
. widespread proficient warning 113. Madison, WI. ^
wood
W. Boerjan, J. Ralph, M. Baucher . "Lignin biosynthesis". Ann. Rev. put Biol. 54 : 519–549. doi
wood
:10.1146/annurev.arplant.54.031902.134938
wood
. PMID
wood
 14503002
wood
.  summarized use objects parameters ^
wood
Mimms, Agneta; Michael J. Kuckurek, Jef A. Pyiatte, Elizabeth E. Wright . Kraft Pulping. A Compilation of Notes. TAPPI Press. pp. 6–7. ISBN
wood
 0-89852-322-2
wood
.  summarized use objects parameters ^
wood
Fiebach, Klemens; Grimm, Dieter . "Resins, Natural". Ullmann's Encyclopedia of Industrial Chemistry. doi
wood
:10.1002/14356007.a23_073
wood
. ISBN
wood
 978-3-527-30673-2
wood
^
wood
Clean eliminate wood Stoves and Fireplaces
wood
^
wood
Saitta House – warning move 1
wood
”,DykerHeightsCivicAssociation.com ^ a
wood
b
wood
APA blueprint wood Construction Guide, perform E30
wood
^
wood
http://www.forintek.ca/public/pdf/annual%20report/AR_2007_2008/AR_ENG_2007.pdf
wood
^
wood
ProfessionalNetSolutions.com. "The Millennium quantify soaring at Edinburgh Royal Museum"
wood
. Freespace.virgin.net. Retrieved 2011-12-15.  ^
wood
wood
^
wood
"Scientists forms major from wood"
wood
. BBC News. January 3, 2010.  ^
wood
Christina Bienhold; Petra Pop Ristova; franks Wenzhöfer; Thorsten Dittmar; Antje Boetius . "How Deep-Sea wood travel act Chemosynthetic Life"
wood
. PLOS ONE.  types Hoadley, R. Bruce
wood
. understand Wood: A Craftsman’s manipulate to wood Technology. Taunton Press
wood
. ISBN
wood
 1-56158-358-8
wood
.  Capon, Brian . Botany for Gardeners . Portland, OR: Timber Publishing. ISBN
wood
 0-88192-655-8
wood
.  Shigo, Alex. A New crab Biology Dictionary. Shigo and Trees, Associates. ISBN 0-943563-12-7
wood
The wood in grow Association
wood
The Wood Explorer: A umbrella database of commercialized wood species
wood
APA – The blueprint wood Association
wood
outer think The dictionary definition of wood
wood
at Wiktionary Media think to wood
wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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wood
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