Natural and laser-induced cavitation in corn stems: On the mechanisms of acoustic emissions

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2012-05-15 DOI:10.4279/PIP.040003

E. Fern'andez, Roberto Fernández, G. Bilmes

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引用次数: 1

Abstract

Water in plant xylem is often superheated, and therefore in a meta-stable state. Under certain conditions, it may suddenly turn from the liquid to the vapor state. This cavitation process produces acoustic emissions. We report the measurement of ultrasonic acoustic emissions (UAE) produced by natural and induced cavitation in corn stems. We induced cavitation and UAE in vivo , in well controlled and reproducible experiments, by irradiating the bare stem of the plants with a continuous-wave laser beam. By tracing the source of UAE, we were able to detect absorption and frequency filtering of the UAE propagating through the stem. This technique allows the unique possibility of studying localized embolism of plant conduits, and thus to test hypotheses on the hydraulic architecture of plants. Based on our results, we postulate that the source of UAE is a transient "cavity oscillation"' triggered by the disruptive effect of cavitation inception. Received: 14 March 2011, Accepted: 23 April 2012; Edited by: V. Lakshminarayanan; Reviewed by: C. Negreira, Laboratorio de Acustica Ultrasonora, Universidad de la Republica, Uruguay; DOI: http://dx.doi.org/10.4279/PIP.040003 Cite as: E. Fernandez, R. J. Fernandez, G. M. Bilmes, Papers in Physics 4, 040003 (2012)

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玉米茎中自然空化和激光诱导空化:声发射机制研究

植物木质部中的水经常处于过热状态，因此处于亚稳定状态。在一定条件下，它可能突然从液体变成蒸汽状态。这个空化过程产生声发射。我们报告了超声波声发射(UAE)的测量产生的自然和诱导空化在玉米茎。在控制良好且可重复的实验中，我们通过连续波激光束照射植物的裸茎，在体内诱导空化和UAE。通过追踪阿联酋的来源，我们能够检测到阿联酋通过茎传播的吸收和频率滤波。这项技术允许研究植物导管局部栓塞的独特可能性，从而测试植物水力结构的假设。根据我们的研究结果，我们假设阿联酋的来源是由空化开始的破坏效应引发的瞬态“空腔振荡”。收稿日期:2011年3月14日，收稿日期:2012年4月23日;编辑:V. Lakshminarayanan;审查人:C. Negreira，乌拉圭共和国大学超声声学实验室;引用出处:E. Fernandez, R. J. Fernandez, G. M. Bilmes, Papers in Physics 4, 040003 (2012)

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.