Go to OSU College of Forestry LWGate Home Page.From: Lloyd.Donaldson@scionresearch.com
Subject: Re: [IAWA Forum] Pit border attraction
Date: Wed, 3 Dec 2008 08:07:19 +1300
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Thomas
The interior surface of pit borders in conifers is quite highly lignifi=
ed.
I am guessing that this surface is sticky and hence particles become
trapped there. This might also be related to the reason that pit aspira=
tion
tends to be permanent if the torus sticks to the inner margin of the pi=
t
border. It would be interesting to study the histochemistry of this sur=
face
in more detail. I guess there would be a selective advantage for such a=
sticky surface particularly for trapping air bubbles (and for aspiratio=
n as
well). Perhaps the physiologists can comment.
Dr Lloyd Donaldson - Senior Scientist
SCION - Next generation biomaterials
Te Papa Tipu Innovation Park, 49 Sala Street
Private Bag 3020, ROTORUA, New Zealand
DDI 64 7 343 5581
Fax 64 7 343 5507
email lloyd.donaldson@scionresearch.com
=
"Thomas Nilsson" =
<Thomas.Nilsson@t =
rv.slu.se> =
To
Sent by: iawa@COF.ORST.EDU =
owner-iawa@COF.OR =
cc
ST.EDU =
Subj=
ect
[IAWA Forum] Pit border attracti=
on
02/12/2008 23:54 =
=
=
Please respond to =
"Thomas Nilsson" =
<Thomas.Nilsson@t =
rv.slu.se> =
=
=
The paper by Matsunaga et al in the latest issue of IAWA Journal (Vol.
29,2008 p. 387-396) illustrates a phenomenon often observed, for which =
I
have not found an explanation. It is very obvious from their micrograph=
s
that the copper carbonate and iron oxide nanoparticles accumulate on th=
e
pit borders. I have observed that bacteria, tiny air bubbles, tiny
creosote particles and iron containing particles observed in waterlogge=
d
archaeological wood also accumulate on the pit borders. Air bubbles may=
sometimes give an illusion of pit border degradation. Grateful for any
explanations.
Thomas Nilsson
SP Tr=E4tek
Stockholm
SWEDEN
=3D=3D=3D=3D=3D=3D=3D=3D Welcome All Anatomists! =3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D
About this IAWA Discussion Group, subscribing, unsubscribing, and archi=
ves:
http://www.cof.orst.edu/org/IAWA
About the IAWA and/or the IAWA Journal:
http://www.kuleuven.ac.be/bio/sys/iawa
The International Association of Wood Anatomists
=
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<p>Thomas<br>
<br>
The interior surface of pit borders in conifers is quite highly lignifi=
ed. I am guessing that this surface is sticky and hence particles becom=
e trapped there. This might also be related to the reason that pit aspi=
ration tends to be permanent if the torus sticks to the inner margin of=
the pit border. It would be interesting to study the histochemistry of=
this surface in more detail. I guess there would be a selective advant=
age for such a sticky surface particularly for trapping air bubbles (an=
d for aspiration as well). Perhaps the physiologists can comment.<br>
<br>
Dr Lloyd Donaldson - Senior Scientist<br>
SCION - Next generation biomaterials<br>
Te Papa Tipu Innovation Park, 49 Sala Street<br>
Private Bag 3020, ROTORUA, New Zealand<br>
DDI 64 7 343 5581<br>
Fax 64 7 343 5507<br>
email lloyd.donaldson@scionresearch.com<br>
<br>
<img width=3D"16" height=3D"16" src=3D"cid:1__=3D43BBFF80DFFB9D448f9e8a=
@scionresearch.com" border=3D"0" alt=3D"Inactive hide details for "=
;Thomas Nilsson" <Thomas.Nilsson@trv.slu.se>">"Thomas N=
ilsson" <Thomas.Nilsson@trv.slu.se><br>
<br>
<br>
<table width=3D"100%" border=3D"0" cellspacing=3D"0" cellpadding=3D"0">=
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h=3D"40%">
<ul>
<ul>
<ul>
<ul><b><font size=3D"2">"Thomas Nilsson" <Thomas.Nilsson@t=
rv.slu.se></font></b><font size=3D"2"> </font><br>
<font size=3D"2">Sent by: owner-iawa@COF.ORST.EDU</font>
<p><font size=3D"2">02/12/2008 23:54</font>
<table border=3D"1">
<tr valign=3D"top"><td width=3D"168" bgcolor=3D"#FFFFFF"><div align=3D"=
center"><font size=3D"2">Please respond to<br>
"Thomas Nilsson" <Thomas.Nilsson@trv.slu.se></font></di=
v></td></tr>
</table>
</ul>
</ul>
</ul>
</ul>
</td><td width=3D"60%">
<table width=3D"100%" border=3D"0" cellspacing=3D"0" cellpadding=3D"0">=
<tr valign=3D"top"><td width=3D"1%"><img width=3D"58" height=3D"1" src=3D=
"cid:3__=3D43BBFF80DFFB9D448f9e8a@scionresearch.com" border=3D"0" alt=3D=
""><br>
<div align=3D"right"><font size=3D"2">To</font></div></td><td width=3D"=
100%"><img width=3D"1" height=3D"1" src=3D"cid:3__=3D43BBFF80DFFB9D448f=
9e8a@scionresearch.com" border=3D"0" alt=3D""><br>
<font size=3D"2">iawa@COF.ORST.EDU</font></td></tr>
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"cid:3__=3D43BBFF80DFFB9D448f9e8a@scionresearch.com" border=3D"0" alt=3D=
""><br>
<div align=3D"right"><font size=3D"2">cc</font></div></td><td width=3D"=
100%"><img width=3D"1" height=3D"1" src=3D"cid:3__=3D43BBFF80DFFB9D448f=
9e8a@scionresearch.com" border=3D"0" alt=3D""><br>
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<tr valign=3D"top"><td width=3D"1%"><img width=3D"58" height=3D"1" src=3D=
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D448f9e8a@scionresearch.com" border=3D"0" alt=3D""><br>
<font size=3D"2">[IAWA Forum] Pit border attraction</font></td></tr>
</table>
<table border=3D"0" cellspacing=3D"0" cellpadding=3D"0">
<tr valign=3D"top"><td width=3D"58"><img width=3D"1" height=3D"1" src=3D=
"cid:3__=3D43BBFF80DFFB9D448f9e8a@scionresearch.com" border=3D"0" alt=3D=
""></td><td width=3D"336"><img width=3D"1" height=3D"1" src=3D"cid:3__=3D=
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<br>
<tt>The paper by Matsunaga et al in the latest issue of IAWA Journal (V=
ol.<br>
29,2008 p. 387-396) illustrates a phenomenon often observed, for which =
I<br>
have not found an explanation. It is very obvious from their micrograph=
s<br>
that the copper carbonate and iron oxide nanoparticles accumulate on th=
e<br>
pit borders. I have observed that bacteria, tiny air bubbles, tiny<br>
creosote particles and iron containing particles observed in waterlogge=
d<br>
archaeological wood also accumulate on the pit borders. Air bubbles may=
<br>
sometimes give an illusion of pit border degradation. Grateful for any<=
br>
explanations.<br>
Thomas Nilsson<br>
SP Tr=E4tek<br>
Stockholm<br>
SWEDEN<br>
=3D=3D=3D=3D=3D=3D=3D=3D Welcome All Anatomists! =3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D<br>
About this IAWA Discussion Group, subscribing, unsubscribing, and archi=
ves:<br>
</tt><tt><a href=3D"http://www.cof.orst.edu/org/IAWA">http://www.cof.or=
st.edu/org/IAWA</a></tt><tt><br>
About the IAWA and/or the IAWA Journal:<br>
</tt><tt><a href=3D"http://www.kuleuven.ac.be/bio/sys/iawa">http://www.=
kuleuven.ac.be/bio/sys/iawa</a></tt><tt><br>
The International Association of Wood Anatomists<br>
<br>
</tt><br>
</body></html>=
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======== Welcome All Anatomists! ==========
About this IAWA Discussion Group, subscribing, unsubscribing, and archives:
http://www.cof.orst.edu/org/IAWA
About the IAWA and/or the IAWA Journal:
http://www.kuleuven.ac.be/bio/sys/iawa
The International Association of Wood Anatomists
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