Effect of water absorption on pollen adhesion

Lin, Haisheng; Lizárraga, Leonardo; Bottomley, Lawrence A.; Meredith, J. Carson

doi:10.1016/j.jcis.2014.11.065

Cited by 43 publications

(45 citation statements)

References 40 publications

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“…For example, κ values were found to decrease from 0.073±0.006 at 5 o C to 0.061±0.007 at 25 o C and to 0.057±0.004 at 37 o C for populus tremuloides pollen, and decrease from 0.060±0.001 at 15 o C to 0.054±0.001 at 25 o C to 0.050±0.002 at 37 o C for paper mulberry pollen. Our measurements at 37 o C (physiological temperature) provide very valuable parameters, which can be used in numerical models to better understand the transport and deposition of pollen particles in the respiratory system and thus their impacts on human health (Yeh et al, 1996;Broday and Georgopoulos, 2001;Park and Wexler, 2008;Lambert et al, 2011;Longest and Holbrook, 2012;Tong et al, 2014). Nevertheless, it should be noted that due to the short residence time in the respiratory system, pollen grains and other inhaled particles in general, may not reach equilibrium with water vapor in the respiratory tract.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, hygroscopicity is closely linked to the ability of aerosol particles to serve as CCN and INPs (Petters and Kreidenweis, 2007;Kreidenweis and Asa-Awuku, 2014;Tang et al, 2016). Several previous studies have measured the hygroscopicity and CCN activities of pollen (Diehl et al, 2001;Pope, 2010;Griffiths et al, 2012;Lin et al, 2015;Steiner et al, 2015;Prisle et al, 2018) and other PBAPs such as bacteria (Pasanen et al, 1991;Reponen et al, 1996;Franc and DeMott, 1998;Ko et al, 2000;Lee et al, 2002;Bauer et al, 2003). For example, water uptake of eleven pollen species was studied using an analytical balance (Diehl et al, 2001), and the mass of pollen was found to be increased by 3-16% at 73% RH and by ~100-300% at 95% RH, compared to that at 0% RH.…”

Section: Introductionmentioning

confidence: 99%

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Water adsorption and hygroscopic growth of six anemophilous pollen species: the effect of temperature

Tang¹,

Gu²,

Ma³

et al. 2018

Preprint

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Abstract. Hygroscopicity largely affects environmental and climatic impacts of pollen grains, one important type of primary biological aerosol particles in the troposphere. However, our knowledge in pollen hygroscopicity is rather limited, and especially the effect of temperature has rarely been explored before. In this work three different techniques, including a vapor sorption analyzer, diffusion reflectance infrared Fourier transform spectroscopy (DRIFTS) and transmission Fourier transform infrared spectroscopy (transmission FTIR) were employed to characterize six anemophilous pollen species and to investigate their hygroscopic properties as a function of relative humidity (RH, up to 95&#8201;%) and temperature (5 or 15, 25 and 37&#8201;&#176;C). Substantial mass increase due to water uptake was observed for all the six pollen species, and at 25&#8201;&#176;C the relative mass increase at 90&#8201;% RH, when compared to that at <&#8201;1&#8201;% RH, ranged from ~&#8201;30 to ~&#8201;50&#8201;%, varying with pollen species. The modified &#954;-K&#246;hler theory can well approximate the mass hygroscopic growth of all the six pollen species, and the single hygroscopicity parameter (&#954;) was determined to be in the range of 0.034&#8201;&#177;&#8201;0.001 to 0.061&#8201;&#177;&#8201;0.007 at 25&#8201;&#176;C. In-situ DRIFTS measurements suggested that water adsorption by pollen species was mainly contributed by OH groups of organic compounds they contained. Good correlations were indeed found between hygroscopicity of pollen grains and the amount of OH groups, as determined using transmission FTIR. Increase in temperature would in general lead to decrease in hygroscopicity, except for pecan pollen. For example, &#954; values decreased from 0.073&#8201;&#177;&#8201;0.006 at 5&#8201;&#176;C to 0.061&#8201;&#177;&#8201;0.007 at 25&#8201;&#176;C and to 0.057&#8201;&#177;&#8201;0.004 at 37&#8201;&#176;C for populus tremuloides pollen, and decreased from 0.060&#8201;&#177;&#8201;0.001 at 15&#8201;&#176;C to 0.054&#8201;&#177;&#8201;0.001 at 25&#8201;&#176;C to 0.050&#8201;&#177;&#8201;0.002 at 37&#8201;&#176;C for paper mulberry pollen.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Water adsorption and hygroscopic growth of six anemophilous pollen species: the effect of temperature

Tang¹,

Gu²,

Ma³

et al. 2018

Preprint

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“…Previous quantitative studies of pollen adhesion to varied surfaces by atomic force microscopy (Lin et al, 2013) showed that pollenkitt significantly enhances pollen adhesion and that the effect is driven by the formation of pollenkitt capillary bridges. A subsequent study found that pollenkitt hydration by water uptake at high humidity changed pollenkitt properties and its capillary adhesion (Lin et al, 2015). This finding has important implications for understanding pollenkitt's role in plant reproduction, allergy and asthma, as well as the role of pollen as atmospheric condensation nuclei.…”

Section: Introductionmentioning

confidence: 93%

CCN activity of six pollenkitts and the influence of their surface activity

Prisle

Lin

Purdue

et al. 2018

Preprint

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Abstract. Pollenkitt is a viscous material that coats grains of pollen and plays important roles in pollen dispersion and plant reproduction. It may also be an important contributor to pollen water uptake and CCN activity. The chemical composition of pollenkitt varies between species, but has been found to comprise complex organic mixtures including oxygenated, lipid, and aliphatic functionalities. The mix of functionalities suggests that pollenkitt may display aqueous surface activity, which could significantly impact pollen interactions with atmospheric water. Here, we study the surface activity of pollenkitt from six different species and its impact on pollenkitt hygroscopicity. We measure cloud activation and concentration dependent surface tension of pollenkitt and its mixtures with ammonium sulfate salt. Experiments are compared to predictions from several thermodynamic models, taking aqueous surface tension reduction and surfactant surface partitioning into account in various ways. We find a clear reduction of surface tension by pollenkitt in aqueous solution and evidence for impact of both surface tension and surface partitioning mechanisms on cloud activation potential and hygroscopicity. In addition, we find indication of significant impact of complex non-ideal solution effects in systematic and consistent size dependency of pollenkitt hygroscopicity.

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“…The contact geometries of pollen-floral interfaces are speciesspecific since pollen surface structures and floral surfaces are incredibly diverse in size, shape, surface ornamentations and presence/absence of surface liquids [13,[15][16][17][18]. Among the diversity in types of stigmas, Asteraceae family is known to possess 'semi-dry' stigma with some combination of characteristics of both dry and wet types of stigma [16].…”

Section: Wetting and Mechanical Properties Of The Stigmatic Surfacesmentioning

confidence: 99%

Attachment-based mechanisms underlying capture and release of pollen grains

Ito

Gorb

2019

J. R. Soc. Interface.

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Successful insect pollination can be achieved by a sequence of numerous attachment and detachment events at various biological surfaces. However, the quantitative measurements of pollen adhesion on biological surfaces have been poorly studied so far. We performed atomic force microscopy adhesion measurements of pollen on two most important floral parts for Asteraceae in a course of pollination: the stigma and style of Hypochaeris radicata plant . The results indicated distinct adhesive properties of them—the pollen adhesion on stigmatic surfaces drastically increased over prolonged contact time, while the pollen adhesion increase on stylar surfaces was rather restrained. Based on the observation with cryo-scanning electron microscopy, we explained the experimental results by the presence of morphological features in form of flexible stigmatic papillae that may play a crucial role in enhancing both capillary attraction and van der Waals forces. The distinct adhesive properties seemingly originate from the unique adhesive tasks that each of the floral parts requires to achieve successful pollination. The insights into the adhesive interaction between pollen and the floral parts, obtained in the present study, may lead to better understanding of pollination mechanisms, which are strongly related to our food production. Additionally, the novel pollen adhesive mechanisms learned from the stigma of the studied Asteraceae plant can inspire biomimetic designs of spontaneous gripping systems.

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Effect of water absorption on pollen adhesion

Cited by 43 publications

References 40 publications

Water adsorption and hygroscopic growth of six anemophilous pollen species: the effect of temperature

Water adsorption and hygroscopic growth of six anemophilous pollen species: the effect of temperature

CCN activity of six pollenkitts and the influence of their surface activity

Attachment-based mechanisms underlying capture and release of pollen grains

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