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<article language="en">
	<journal>
		<journal_title>Atmospheric Chemistry and Physics Discussions</journal_title>
		<journal_url>www.atmos-chem-phys-discuss.net</journal_url>
		<issn>1680-7367</issn>
		<eissn>1680-7375</eissn>
		<volume_number>8</volume_number>
		<issue_number>6</issue_number>
		<publication_year>2008</publication_year>
	</journal>
	<doi>10.5194/acpd-8-19707-2008</doi>
	<article_url>http://www.atmos-chem-phys-discuss.net/8/19707/2008/</article_url>
	<abstract_html>http://www.atmos-chem-phys-discuss.net/8/19707/2008/acpd-8-19707-2008.html</abstract_html>
	<fulltext_pdf>http://www.atmos-chem-phys-discuss.net/8/19707/2008/acpd-8-19707-2008.pdf</fulltext_pdf>
	<start_page>19707</start_page>
	<end_page>19741</end_page>
	<publication_date>2008-11-19</publication_date>
	<article_title content_type="html">Methyl chavicol: characterization of its biogenic emission rate, abundance, and oxidation products in the atmosphere</article_title>
	<authors>
		<author numeration="1" affiliations="1">
			<name>N. C. Bouvier-Brown</name>
			<email>nbouvier@nature.berkeley.edu</email>
		</author>
		<author numeration="2" affiliations="1">
			<name>A. H. Goldstein</name>
		</author>
		<author numeration="3" affiliations="1">
			<name>D. R. Worton</name>
		</author>
		<author numeration="4" affiliations="1">
			<name>D. M. Matross</name>
		</author>
		<author numeration="5" affiliations="2">
			<name>J. B. Gilman</name>
		</author>
		<author numeration="6" affiliations="2">
			<name>W. C. Kuster</name>
		</author>
		<author numeration="7" affiliations="2">
			<name>D. Welsh-Bon</name>
		</author>
		<author numeration="8" affiliations="2">
			<name>C. Warneke</name>
		</author>
		<author numeration="9" affiliations="2">
			<name>J. A. de Gouw</name>
		</author>
		<author numeration="10" affiliations="3">
			<name>T. M. Cahill</name>
		</author>
		<author numeration="11" affiliations="4">
			<name>R. Holzinger</name>
		</author>
	</authors>
	<affiliations>
		<affiliation numeration="1" content_type="html">University of California, Berkeley, CA, USA</affiliation>
		<affiliation numeration="2" content_type="html">NOAA Earth System Research Laboratory and Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA</affiliation>
		<affiliation numeration="3" content_type="html">Arizona State University, West Campus, Phoenix, AZ, USA</affiliation>
		<affiliation numeration="4" content_type="html">Utrecht University, Utrecht, The Netherlands</affiliation>
	</affiliations>
	<abstract content_type="html">We report measurements of ambient atmospheric mixing ratios for methyl
chavicol and determine its biogenic emission rate. Methyl chavicol, a
biogenic oxygenated aromatic compound, is abundant within and above Blodgett
Forest, a ponderosa pine forest in the Sierra Nevada Mountains of
California. Methyl chavicol was detected simultaneously by three in-situ
instruments – a gas chromatograph with mass spectrometer detector (GC-MS),
a proton transfer reaction mass spectrometer (PTR-MS), and a thermal
desorption aerosol GC-MS (TAG) – and found to be abundant within and above
Blodgett Forest, a ponderosa pine forest in the Sierra Nevada Mountains of
California. Methyl chavicol atmospheric mixing ratios are strongly
correlated with 2-methyl-3-buten-2-ol (MBO), a light- and
temperature-dependent biogenic emission from the ponderosa pine trees at
Blodgett Forest. Scaling from this correlation, methyl chavicol emissions
account for 4–68% of the carbon mass emitted as MBO in the daytime,
depending on the season. From this relationship, we estimate a daytime basal
emission rate of 0.72–10.2 μgCg&lt;sup&gt;&amp;minus;1&lt;/sup&gt;h&lt;sup&gt;&amp;minus;1&lt;/sup&gt;, depending on needle age
and seasonality. We also present the first observations of its oxidation
products (4-methoxybenzaldehyde and 4-methyoxy benzene acetaldehyde) in the
ambient atmosphere. Methyl chavicol is a major essential oil component of
many plant species. This work suggests that methyl chavicol plays a
significant role in the atmospheric chemistry of Blodgett Forest, and
potentially other sites, and should be included explicitly in both biogenic
volatile organic carbon emission and atmospheric chemistry models.</abstract>
	<references>
		<reference numeration="1" content_type="text"> Adams, R. P. and Edmunds Jr., G. F.: A re-examination of the volatile leaf oils of Pinus ponderosa Dougl. Ex. P. Lawson using Ion Trap Mass Spectrometry, Flavour Frag. J., 4, 19–23, 1989. </reference>
		<reference numeration="2" content_type="text"> Adams, R. P.: Identification of essential oil components by gas chromatography/mass spectrometry, Allured Publishing Corp., Carol Stream, Illinois, USA, 804 pp., 2007. </reference>
		<reference numeration="3" content_type="text"> Atkinson, R. and Arey, J.: Gas-phase tropospheric chemistry of biogenic volatile organic compounds: A review, Atmos. Environ., 37, S197–S219, 2003. </reference>
		<reference numeration="4" content_type="text"> Baker, B., Guenther, A., Greenberg, J., Goldstein, A., and Fall, R.: Canopy fluxes of 2-methyl-3-buten-2-ol over a ponderosa pine forest by relaxed eddy accumulation: Field data and model comparison, J. Geophys. Res., 104, 26 107–26 114, 1999. </reference>
		<reference numeration="5" content_type="text"> Barazani, O., Cohen, Y., Fait, A., Diminshtein, S., Dudai, N., Ravid, U., Putievsky, E., and Friedman, J.: Chemotypic differentiation in indigenous populations of Foeniculum vulgare var. vulgare in Israel, Biochem. Syst. Ecol., 30, 721–731, 2002. </reference>
		<reference numeration="6" content_type="text"> Bauer, M. R., Hultman, N. E., Panek, J. A., and Goldstein, A. H.: Ozone deposition to a ponderosa pine plantation in the Sierra Nevada Mountains (CA): A comparison of two different climatic years, J. Geophys. Res., 105, 22 123–22 136, 2000. </reference>
		<reference numeration="7" content_type="text"> Bouvier-Brown, N. C., Holzinger, R., Palitzsch, K., and Goldstein, A. H.: Quantifying sesquiterpene and oxygenated terpene emissions from live vegetation using solid-phase microextraction fibers, J. Chromatogr. A, 1161, 113–120, 2007. </reference>
		<reference numeration="8" content_type="text"> Bouvier-Brown, N. C., Holzinger, R., Palitzsch, K., and Goldstein, A. H.: Large emissions of sesquiterpenes and methyl chavicol quantified from branch enclosure measurements, Atmos. Environ., in press, 2008. </reference>
		<reference numeration="9" content_type="text"> Brophy, J. J. and Boland, D. J.: The leaf essential oil of two chemotypes of \textitBackhousia anisata Vickery, Flavour Frag. J., 6, 187–188, 1991. </reference>
		<reference numeration="10" content_type="text"> Cahill, T. M., Seaman, V. Y., Charles, M. J., Holzinger, R., and Goldstein, A. H.: Secondary organic aerosol formed from oxidation of biogenic volatile organic compounds in the Sierra Nevada Mountains of California, J. Geophys. Res., 111, D16312, 2006. </reference>
		<reference numeration="11" content_type="text"> Chadwick, T. C. and Palkin, S.: Composition of American gum terpentine exclusive of the pinenes, USDA Technical Bulletin No 749, 16 pp., 1941. </reference>
		<reference numeration="12" content_type="text"> Ciccio, J. F.: A source of almost pure methyl chavicol: volatile oil from the aerial parts of Tagetes lucida (Asteraceae) cultivated in Costa Rica, Rev. Biol. Trop., 54(4), 853–857, 2004. </reference>
		<reference numeration="13" content_type="text"> Cobb Jr., F. W., Zavarin, E., and Bergot, J.: Effect of air pollution on the volatile oil form leaves of Pinus ponderosa, Phytochemistry, 11, 1815–1818, 1972. </reference>
		<reference numeration="14" content_type="text"> de Gouw, J. and Warneke, C.: Measurements of volatile organic compounds in the Earth&apos;s atmosphere using Proton-Transfer-Reaction Mass Spectrometry, Mass Spectrom. Rev., 26, 223–257, 2007. </reference>
		<reference numeration="15" content_type="text"> De Vincenzi, M., Silano, M., Maialetti, F., and Scazzocchio, B.: Constituents of aromatic plants: II. Estragole, Fitoterapia, 71, 725–729, 2000. </reference>
		<reference numeration="16" content_type="text"> Dreyfus, G. B., Schade, G. W., and Goldstein, A. H.: Observational constraints on the contribution of isoprene oxidation to ozone production on the western slope of the Sierra Nevada, California, J. Geophys. Res., 107(D19), doi:10.1029/2001JD001490, 2002. </reference>
		<reference numeration="17" content_type="text"> Duke, J. A.: Handbook of medicinal herbs, CRC Press, Boca Raton, 896 pp., 2001. </reference>
		<reference numeration="18" content_type="text"> Farmer, D. K. and Cohen, R. C.: Observations of HNO&lt;sub&gt;3&lt;/sub&gt;, $§igma$AN, $§igma$PN, and NO&lt;sub&gt;2&lt;/sub&gt; fluxes: evidence for rapid HO&lt;sub&gt;x&lt;/sub&gt; chemistry within a pine forest canopy, Atmos. Chem. Phys., 8, 3899–3917, 2008. </reference>
		<reference numeration="19" content_type="text"> Fleisher, A. and Fleisher, Z.: Study of Dictamnus gymnostylis volatiles and plausible explanation of the &quot;burning bush&quot; phenomenon, J Essent Oil Res., 16(1), 1–3, 2004. </reference>
		<reference numeration="20" content_type="text"> Fuentes, J. D., Lerdau, M., Atkinson, R., Baldocchi, D., Bottenheim, J. W., Ciccioli, P., Lamb, B., Geron, C., Gu, L., Guenther, A., Sharkey, T. D., and Stockwell, W.: Biogenic hydrocarbons in the atmospheric boundary layer: A review, B. Am. Meteorol. Soc., 81, 1537–1575, 2000. </reference>
		<reference numeration="21" content_type="text"> Goldan, P. D., Kuster, W. C., Fehsenfeld, F. C., and Montzka, S. A.: The observation of a C$_5$ alcohol emission in a North American pine forest, Geophys. Res. Lett., 20(11), 1039–1042, 1993. </reference>
		<reference numeration="22" content_type="text"> Goldan, P. D., Kuster, W. C., Williams, E., Murphy, P. C., Fehsenfeld, F. C., and Meagher, J.: Nonmethane hydrocarbon and oxy hydrocarbon measurements during the 2002 New England Air Quality Study, J. Geophys. Res., 109, D21309, doi:10.1029/2003JD004455, 2004. </reference>
		<reference numeration="23" content_type="text"> Goldstein, A. H., Hultman, N. E., Fracheboud, J. M., Bauer, M. R., Panek, J. A., Xu, M., Qi, Y., Guenther, A. B., and Baugh, W.: Effects of climate variability on the carbon dioxide, water, and sensible heat fluxes above a ponderosa pine plantation in the Sierra Nevada (CA), Agr. Forest Meteorol., 101, 113–129, 2000. </reference>
		<reference numeration="24" content_type="text"> Gray, D. W., Goldstein, A. H., and Lerdau, M. T.: The influence of light environment on photosynthesis and basal methylbutenol emission from Pinus ponderosa, Plant Cell Environ., 28, 1463–1474, 2005. </reference>
		<reference numeration="25" content_type="text"> Hayes, J. L. and Strom, B. L.: 4-allylanisole as an inhibitor of bark beetle (Coleoptera: Scolytidae) aggregation, J. Econ. Entomol., 87(6), 1586–1594, 1994. </reference>
		<reference numeration="26" content_type="text"> Hayes, J. L., Strom, B. L., Roton, L. M., and Ingram Jr., L. L.: Repellent properties of the host compound 4-allylanisole to the southern pine beetle, J. Chem. Ecol., 20(7), 1595–1615, 1994. </reference>
		<reference numeration="27" content_type="text"> Hazarika, A. K. and Nath, S. C.: Methyl chavicol – The major component of the rhizome oil of Amomum linguiforme benth., J. Essent. Oil Res., 7, 325–326, 1995. </reference>
		<reference numeration="28" content_type="text"> Helmig, D., Ortega, J., Duhl, T., Tanner, D., Guenther, A., Harley, P., Wiedinmyer, C., Milford, J., and Sakulyanontvittaya, T.: Sesquiterpene emissions from pine trees – Identifications, emission rates and flux estimates for the contiguous United States, Environ. Sci. Technol., 41, 1545–1553, 2007. </reference>
		<reference numeration="29" content_type="text"> Himejima, M., Hobson, K. R., Otsuka, T., Wood, D. L., and Kubo, I.: Antimicrobial terpenes from the oleoresin of ponderosa pine tree Pinus ponderosa: A defense mechanism against microbial invasion, J. Chem. Ecol., 18(10), 1809–1818, 1992. </reference>
		<reference numeration="30" content_type="text"> Holzinger, R., Lee, A., Paw U, K. T., and Goldstein, A. H.: Observations of oxidation products above a forest imply biogenic emissions of very reactive compounds, Atmos. Chem. Phys., 5, 67–75, 2005. </reference>
		<reference numeration="31" content_type="text"> Joseph, G., Kelsey, R. G., Peck, R. W., and Niwa, C. G.: Response of some scolytids and their predators to ethanol and 4-allylanisole in pine forests of central Oregon, J. Chem. Ecol., 27, 697–715, 2001. </reference>
		<reference numeration="32" content_type="text"> Kaya, A., Demirci, B., and Can Başer, K. H.: Study of the essential oils from the flowers and fruits of \textitScandix iberica Bieb. growing in Turkey, J. Essent. Oil Res., 19(2), 155–156, 2007. </reference>
		<reference numeration="33" content_type="text"> Koziel, J. A., Odziemkowski, M., and Pawliszyn, J.: Sampling and analysis of airborne particulate matter and aerosols using in-needle trap and SPME fiber devices, Anal. Chem., 73, 47–54, 2001. </reference>
		<reference numeration="34" content_type="text"> Krauze-Baranowska, M., Mardarowicz, M., Wiwart, M., Poblocka, L., and Dynowska, M.: Antifungal activity of the essential oils from some species of the genus Pinus, Verlag der Zeitschrift für Naturforschung, 57c, 478–482, 2002. </reference>
		<reference numeration="35" content_type="text"> Kreisberg, N. M., Hering, S. V., Williams, B. J., and Goldstein, A. H.: Quantification of hourly speciated organic compounds in atmospheric aerosols, measured by an in-situ Thermal desorption Aerosol Gas chromatograph (TAG), Aerosol Sci. Tech., in press, 2008. </reference>
		<reference numeration="36" content_type="text"> Kurose, K., Okamura, D., and Yatagai, M.: Composition of the essential oil from the leaves of nine Pinus species and the cones of three of Pinus species, Flavour Frag. J., 22, 10–20, 2007. </reference>
		<reference numeration="37" content_type="text"> Kurpius, M. R. and Goldstein, A. H.: Gas-phase chemistry dominates O&lt;sub&gt;3&lt;/sub&gt; loss to a forest, implying a source of aerosols and hydroxyl radicals to the atmosphere, Geophys. Res. Lett., 30, 1371, doi:10.1029/2002GL016785, 2003. </reference>
		<reference numeration="38" content_type="text"> Lamanna, M. S. and Goldstein, A. H.: In situ measurements of C&lt;sub&gt;2&lt;/sub&gt;–C$_10$ volatile organic compounds above a Sierra Nevada ponderosa pine plantation, J. Geophys. Res., 104, 21 247–21 262, 1999. </reference>
		<reference numeration="39" content_type="text"> Lee, A., Goldstein, A. H., Keywood, M. D., Gao, S., Varutbangkul, V., Bahreini, R., Ng, N. L., Flagan, R. C., and Seinfeld, J. H.: Gas-phase products and secondary aerosol yields from the ozonolysis of ten different terpenes, J. Geophys. Res., 111, D07302, doi:10.1029/2005JD006437, 2006a. </reference>
		<reference numeration="40" content_type="text"> Lee, A., Goldstein, A. H., Kroll, J. H., Ng, N. L., Varutbangkul, V., Flagan, R. C., and Seinfeld, J. H.: Gas-phase products and secondary aerosol yields from the photoxidation of 16 different terpenes, J. Geophys. Res., 111, D17305, doi:10.1029/2006JD007050, 2006b. </reference>
		<reference numeration="41" content_type="text"> Lerdau, M., Guenther, A., and Monson, R.: Plant production and emission of volatile organic compounds, BioScience, 47(6), 373–383, 1997. </reference>
		<reference numeration="42" content_type="text"> Leung, A. Y. and Foster, S.: Encyclopedia of common natural ingredients, John Wiley &amp; Sons, New York, NY, 1996. </reference>
		<reference numeration="43" content_type="text"> Lindinger, W., Hansel, A., and Jordan, A.: On-line monitoring of volatile organic compounds at pptv levels by means of proton-transfer-reaction mass spectrometry (PTR-MS) – Medical applications, food control, and environmental research, Int. J. Mass Spectrom., 173(3), 191–241, 1998. </reference>
		<reference numeration="44" content_type="text"> Mazza, G. and Kiehn, F. A.: Essential oil of \textitAgastache foeniculum, a potential source of methyl chavicol, J. Essent. Oil Res., 4, 295–299, 1992. </reference>
		<reference numeration="45" content_type="text"> Merle, H., Ferriol, M., Boira, H., and Blaizquez, A.: Composition of the essential oil of \textitDictamnus \textithispanicus from Spain, J. Essent. Oil Res., 18(5), 483–485, 2006. </reference>
		<reference numeration="46" content_type="text"> Millet, D. B., Donahue, N. M., Pandis, S. N., Polidori, A., Stanier, C. O., Turpin, B. J., and Goldstein, A. H.: Atmospheric volatile organic compound measurements during the Pittsburgh Air Quality Study: Results, interpretation, and quantification of primary and secondary contributions, J. Geophys. Res., 110, D07S07, doi:10.1029/2004JD004601, 2005. </reference>
		<reference numeration="47" content_type="text"> Mirov, N. T.: Composition of gum terpentines of pines, USDA Forest Service Technical Bulletin No. 1239, 158 pp., 1961. </reference>
		<reference numeration="48" content_type="text"> Mirov, N. T.: The terpenes (in relation to the biology of genus \textitPinus), Annu. Rev. Biochem., 17, 521–540, 1948. </reference>
		<reference numeration="49" content_type="text"> Nebeker, T. E., Schmitz, R. F., Tisdale, R. A., and Hobson, K. R.: Chemical and nutritional status of dwarf mistletoe, Armillaria root rot, and Comandra blister rust infected trees which may influence tree susceptibility to bark beetle attack, Can. J. Botany, 73, 360–369, 1995. </reference>
		<reference numeration="50" content_type="text"> Ondarza, M. and Sanchez, A.: Steam distillation and supercritical fluid extraction of some Mexican spices, Chromatographia, 30, 16–23, 1990. </reference>
		<reference numeration="51" content_type="text"> Papadopoulou, P., Couladis, M., and Tzakou, O.: Essential oil composition of two Greek Echinops species: E graecus Miller and E ritro L., J. Essent. Oil Res., 18(3), 242–243, 2006. </reference>
		<reference numeration="52" content_type="text"> Pino, J. A., Marbot, R., and Marti, M. P.: Chemical composition of the essential oil of Helenium amarum (Raf.) H. Rock from Cuba, J. Essent. Oil Res., 18(4), 438–439, 2006a. </reference>
		<reference numeration="53" content_type="text"> Pino, J. A., Marbot, R., and Marti, M. P.: Leaf oil of persea americana Mill. var. drymifolia cv. Duke grown in Cuba, J. Essent. Oil Res., 18(4), 440–442, 2006b. </reference>
		<reference numeration="54" content_type="text"> Pollmann, J., Ortega, J., and Helmig, D.: Analysis of atmospheric sesquiterpenes: Sampling losses and mitigation of ozone interferences, Environ. Sci. Technol., 39, 9620–9629, 2005. </reference>
		<reference numeration="55" content_type="text"> Ramanoelina, P. A. R., Rasoarahona, J. R. E., and Gaydou, E. M.: Chemical composition of Ravensara aromatica Sonn. leaf essential oils from Madagascar, J. Essent. Oil Res., 18(2), 215–217, 2006. </reference>
		<reference numeration="56" content_type="text"> Rezzi, S., Bighelli, A., Mouillot, D., and Casanova, J.: Compostion and chemical variability of the needle essential oil of Pinus nigra subsp. laricio from corsica, Flavour Frag. J., 16, 379–383, 2001. </reference>
		<reference numeration="57" content_type="text"> Sajjadi, S. E.: Analysis of the essential oils of two cultivated basil (\textitOcimum basilicum L.) from Iran, DARU, 14, 128–130, 2006. </reference>
		<reference numeration="58" content_type="text"> Sakulyanontvittaya, T., Duhl, T., Wiedinmyer, C., Helmig, D., Matsunaga, S., Potosnak, M., Milford, J., and Guenther, A.: Monoterpene and sesquiterpene emission estimates for the United States, Environ. Sci. Techn., 42(5), 1623–1629, 2008. </reference>
		<reference numeration="59" content_type="text"> Salom, S. M. and Hobson, K.: Application of semiochemicals for management of bark beetle infestations – proceedings of an informal conference, Annual meeting of the Entomological Society of America 12–16 December 1993, Indianapolis, IN, USA, Gen. Tech. Rep. INT-GTR-318, Ogden, UT: USDA, Forest Service, 1995. </reference>
		<reference numeration="60" content_type="text"> Sangwan, N. S., Farooqui, A. H. A., Shabih, F., and Sangwan, R. S.: Regulation of essential oil production in plants, Plant Growth Regul., 34, 3–21, 2001. </reference>
		<reference numeration="61" content_type="text"> Schade G. W., Goldstein, A. H., Gray, D. W., and Lerdau, M. T.: Canopy and leaf level 2-methyl-3-buten-2-ol fluxes from a ponderosa pine plantation, Atmos. Environ., 34, 3535–3544, 2000. </reference>
		<reference numeration="62" content_type="text"> Schade, G. W. and Goldstein, A. H: Fluxes of oxygenated volatile organic compounds from a ponderosa pine plantation, J. Geophys. Res., 106, 3111–3123, 2001. </reference>
		<reference numeration="63" content_type="text"> Shin, S. and Kang, C.-A.: Antifungal activity of the essential oil of Agastache rugosa Kuntze and its snynergism with ketoconazole, Lett. Appl. Microbiol., 36, 111–115, 2003. </reference>
		<reference numeration="64" content_type="text"> Simon, J. E., Quinn, J., and Murray, R. G.: Basil: A source of essential oils, in: Advances in new crops, edited by: Janick, J. and Simon, J. E., 484–489, Timber Press, Portland, OR, 1990. </reference>
		<reference numeration="65" content_type="text"> Snyder, M. A. and Bower, N. W.: Resistance to bark beetle attack in Caribbean pine: Potential role of 4-allylanisole, Biotropica, 37(4), 702–705, 2005. </reference>
		<reference numeration="66" content_type="text"> Southwell, I. A., Russell, M. F., Smith, R. L., and Vinnicombe, A.: Ochrosperma lineare, a new source of methyl chavicol, J. Essent. Oil Res., 15(5), 329–330, 2003. </reference>
		<reference numeration="67" content_type="text"> Spada, N., Fujii, E., and Cahill, T. M.: Diurnal cycles of acrolein and other small aldehydes in regions impacted by vehicle emissions, Environ. Sci. Technol., 42(19) 7084–7090, doi:10.1021/es801656e, 2008. </reference>
		<reference numeration="68" content_type="text"> Steiner, A. L., Tonse, S., Cohen, R. C., Goldstein, A. H., and Harley, R. A.: Biogenic 2-methyl-3-buten-2-ol increases regional ozone and HO&lt;sub&gt;x&lt;/sub&gt; sources, Geophys. Res. Lett., 34, L15806, doi:10.1029/2007GL030802, 2007. </reference>
		<reference numeration="69" content_type="text"> Steiner, A. L., Cohen, R. C., Harley, R. A., Tonse, S., Millet, D. B., Schade, G. W., and Goldstein, A. H.: VOC reactivity in central California: comparing an air quality model to ground-based measurements, Atmos. Chem. Phys., 8, 351–368, 2008. </reference>
		<reference numeration="70" content_type="text"> Strom, B. L., Goyer, R. A., Ingram Jr., L. L., Boyd, G. D. L., and Lott, L. H.: Oleoresin: characteristics of progeny of loblolly pines that escaped attack from the southern pine beetle, Forest Ecol. Manag., 158, 168–178, 2002. </reference>
		<reference numeration="71" content_type="text"> Strom, B. L., Clarke, S. R., and Shea, P. J.: Efficacy of 4-allylanisole-based products for protecting individual loblolly pines from Dendroctonus frontalis Zimmermann (Coleoptra: Scolytidae), Can. J. Forest Res., 34, 659–665, 2004. </reference>
		<reference numeration="72" content_type="text"> Sutherland, M. D. and Wells, J. W.: A re-examination of Indian and Loblolly turpentines, J Org Chem., 21(11), 1272–1275, 1956. </reference>
		<reference numeration="73" content_type="text"> Tchoumbougnang, F., Zollo, P. H. A., Avlessi, F., Alitonou, G. A., Sohounhloue, D. K., Ouamba, J. M., Tsomambet, A., Okemy-Andissa, N., Dagne, E., Agnaniet, H., Bessiere, J. M., and Menut, C.: Variability in the chemical composition of the essential oils of five Ocimum species from Tropical African area, J. Essent. Oil Res., 18(2), 194–199, 2006. </reference>
		<reference numeration="74" content_type="text"> US EPA, M.l.: Estimation Programs Interface Suite for Microsoft Windows, AOPWIN v.1.92, United States Environmental Protection Agency, Washington D.C., USA, 2000. </reference>
		<reference numeration="75" content_type="text"> Warneke, C., de Gouw, J. A., Lovejoy, E. R., Murphy, P. C., Kuster, W. C., and Fall, R.: Development of proton-transfer ion trap-mass spectrometry: On-line detection and identification of volatile organic compounds in air, J. Am. Soc Mass Spectr., 16, 1316–1324, 2005a. </reference>
		<reference numeration="76" content_type="text"> Warneke, C., de Gouw, J. A., Goldan, P. D., Kuster, W. C., Shao, M., Lovejoy, E. R., Fall, R., and Fehsenfeld, F. C.: Online volatile organic compound measurements using a newly developed proton-transfer ion-trap mass spectrometry instrument during New England Air Quality Study – Intercontinental Transport and Chemical Transformation 2004: Performance, intercomparison, and compound identification, Environ. Sci. Technol., 39, 5390–5397, 2005b. </reference>
		<reference numeration="77" content_type="text"> Werker, E., Putievsky, E., Ravid, U., Dudai, N., and Katzir, I.: Glandular hairs, secretory cavities, and the essential oil in leaves of tarragon (\textitArtemisia dracunculus L.), Journal of Herbs, Spices and Medicinal Plants, 4(3), 19–32, 1994. </reference>
		<reference numeration="78" content_type="text"> Werner, R. A.: Aggregation behaviour of the beetle Ips gradicollis in response to host-produced attractants, J. Insect. Physiol., 18, 423–437, 1972. </reference>
		<reference numeration="79" content_type="text"> Werner, R. A.: Toxicity and repellency of 4-allylanisole and monoterpenes from white spruce and tamarack to the spruce beetle and eastern larch beetle (Coleoptera: Scolytidae), Environ. Entomol., 24, 372–379, 1995. </reference>
		<reference numeration="80" content_type="text"> Williams, B. J., Goldstein, A. H., Kreisberg, N. M., and Hering, S. V.: An in-situ instrument for speciated organic composition of atmospheric aerosols: Thermal desorption Aerosol GC/MS-FID (TAG), Aerosol Sci. Tech., 40, 627–638, 2006. </reference>
		<reference numeration="81" content_type="text"> Yoshida, S.: Biosynthesis and conversion of aromatic amino acids in plants, Ann. Rev. Plant Physio., 20, 41–62, 1969. </reference>
		<reference numeration="82" content_type="text"> Zavarin, E., Cobb Jr., F. W., Bergot, J., and Barber, H. W.: Variation in the Pinus ponderosa needle oil with season and needle age, Phytochemistry, 10, 3107–-3114, 1971. </reference>
	</references>
</article>

