Ceglia v. Zuckerberg et al

Filing 197

DECLARATION signed by Larry Stewart re 192 Declaration, 196 Certificate of Service,, 189 MOTION for Sanctions Memorandum of Law in Support of Motion for Sanctions for Spoliation by Defendants filed by Paul D. Ceglia. (Attachments: # 1 Exhibit Attachment 1, # 2 Exhibit Attachment 2, # 3 Exhibit Attachment 3)(Boland, Dean)

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Yellowing and IR-changes of spruce wood as result of UV-irradiation. | Mendeley
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Yellowing and IR-changes of spruce wood as result of UV-irradiation.
by Uwe Müller, Manfred Rätzsch, Manfred Schwanninger, Melanie Steiner, Harald Zöbl
Materials Science › Wood Papers
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Journal of photochemistry and photobiology B Biology (2003)
Volume: 69, Issue: 2, Pages: 97-105

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PubMed: 12633982
Available from www.ncbi.nlm.nih.gov
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IR-change and colour changes of long-oil air
drying alkyd paints as a result of UV irradiation

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Suzana M Cakić, Ivan S Ristić, Jašo M Vladislav,
Jakov V Stamenković, Dragan T Stojiljković in

Progress in Organic Coatings (2011)

Abstract

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The yellowing and IR-changes of spruce wood as a result of UV-irradiation were
studied using two different types of xenon lamps (lambda>300 nm; I(o)=50 mW cm(2) and lambda>280 nm; I(o)=17.5 mW cm(-2)). Changes in the IR spectra as well as
the yellowing of the irradiated wood surfaces show the influence of UV light on the
wood modules. The UV-irradiation (72 h; lambda>300 nm; I(o)=50 mW cm(-2))
decreased the lignin content on the surface by up to 20% of the original values. The
colour difference of yellowing (deltaE) exhibited a systematic trend to higher values
with increasing irradiation time. Our results show that the photoyellowing (UV-Vis
detection) correlates very well with lignin degradation (IR detection). This result is in
agreement with the quinone formation as the chromophoric reaction product of
lignin decay. The degradation, yellowing, and oxidation kinetics differed only little
using different light sources. The absorbed light intensity, which depends on
wavelength, the intensity distribution of the light source and the absorption
spectrum of lignin, influenced the degradation rate. Under the current experimental
conditions, the absorption spectrum of lignin was the most important factor.
Therefore, irradiation with lambda>280 nm is useful for rapidly monitoring the UVdegradation of wood

Fractionation of processed spruce wood obtained
in the production of ethanol
C Johansson, K Lundquist, H Theliander in
Bioresources (2009)
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IR-change and colour changes of long-oil air drying alkyd paints as a
result of UV irradiation
Suzana M Cakić, Ivan S Ristić, Jašo M Vladislav, Jakov V Stamenković, Dragan T
Stojiljković in Progress in Organic Coatings (2011)
Save PDF to library · Related research

3 readers

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Yellowing and IR-changes of spruce wood as result of UV-irradiation. | Mendeley

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