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2. Unusual salt effects on the time-dependent behavior of charge and shape anisotropic hectorite clay gels: Role of electric double layer (EDL) repulsive force.

Author

Leong, Yee-Kwong and Clode, Peta

Subjects
*ELECTRIC double layer, *SHEARING force, *REJUVENATION, *BLOOD platelets, *SALT
Abstract

Salt strengthened the bond formed and quickened the bonding process of 3–5 wt. % hectorite gels during the structural rejuvenation process. This even occurred at 0.002M KCl. Microstructure showed exfoliated, flexible platelet bonding in (+)edge–(−)face configurations. The display of prominent aging time-dependent behavior is due to the structural rejuvenation process being controlled by the electric double layer (EDL) repulsive force. Salt increased the lower energy paths to bonding in the (+)edge–(−)face configurations and weakened the EDL force to form stronger bonds. The Leong model time constant data supported the faster bonding process. In shear, the gels with a weakened EDL repulsive force caused by 0.01 and 0.1M KCl treatment were unable to display EDL force-control time-dependent behavior in the stepdown shear stress response. This situation was remedied by increasing the negative charge density of platelets with adsorbed P2O74−. The amount of P2O74− needed was higher at 0.1M KCl. [ABSTRACT FROM AUTHOR]

Published
2024
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6. The spectrum of Ih ice using terahertz time-domain spectroscopy.

Author

Tao, Yu Heng, Dai, Xiangyu, Moggach, Stephen A., Clode, Peta L., Fitzgerald, Anthony J., Hodgetts, Stuart I., Harvey, Alan R., and Wallace, Vincent P.

Subjects
TERAHERTZ time-domain spectroscopy, TERAHERTZ spectroscopy, ICE crystals, REFRACTIVE index, AQUEOUS solutions
Abstract

Here, we report the frequency-dependent spectrum of ice Ih in the range of 0.2–2 THz. We confirm the presence of a feature that blue-shifts from around 1.55–1.65 THz with a decreasing temperature from 260 to 160 K. There is also a change in the trend of the refractive index of ice corresponding to a dispersion, which is also around 1.6 THz. The features are reproduced in data acquired with three commercial terahertz time-domain spectrometers. Computer-simulated spectra assign the feature to lattice translations perpendicular to the 110 and 1 ̄ 10 planes of the ice Ih crystal. The feature's existence should be recognized in the terahertz measurements of frozen aqueous solution samples to avoid false interpretations. [ABSTRACT FROM AUTHOR]

Published
2024
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22. Salt tolerance in mungbean is associated with controlling Na and Cl transport across roots, regulating Na and Cl accumulation in chloroplasts and maintaining high K in root and leaf mesophyll cells.

Author

Iqbal, Md Shahin, Clode, Peta L., Malik, Al Imran, Erskine, William, and Kotula, Lukasz

Subjects
*CELL compartmentation, *SALINITY, *CHLOROPLASTS, *ROOT development, *XYLEM, *EFFECT of salt on plants
Abstract

Salinity tolerance requires coordinated responses encompassing salt exclusion in roots and tissue/cellular compartmentation of salt in leaves. We investigated the possible control points for salt ions transport in roots and tissue tolerance to Na+ and Cl– in leaves of two contrasting mungbean genotypes, salt‐tolerant Jade AU and salt‐sensitive BARI Mung‐6, grown in nonsaline and saline (75 mM NaCl) soil. Cryo‐SEM X‐ray microanalysis was used to determine concentrations of Na, Cl, K, Ca, Mg, P, and S in various cell types in roots related to the development of apoplastic barriers, and in leaves related to photosynthetic performance. Jade AU exhibited superior salt exclusion by accumulating higher [Na] in the inner cortex, endodermis, and pericycle with reduced [Na] in xylem vessels and accumulating [Cl] in cortical cell vacuoles compared to BARI Mung‐6. Jade AU maintained higher [K] in root cells than BARI Mung‐6. In leaves, Jade AU maintained lower [Na] and [Cl] in chloroplasts and preferentially accumulated [K] in mesophyll cells than BARI Mung‐6, resulting in higher photosynthetic efficiency. Salinity tolerance in Jade AU was associated with shoot Na and Cl exclusion, effective regulation of Na and Cl accumulation in chloroplasts, and maintenance of high K in root and leaf mesophyll cells. Summary statement: Salinity tolerance in mungbean is related to its ability to intercept Na and Cl in roots, thereby reducing Na and Cl transport to shoot, effectively regulate Na and Cl accumulation in chloroplasts, and maintain high K in root and leaf mesophyll cells. [ABSTRACT FROM AUTHOR]

Published
2024
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32. AusTraits, a curated plant trait database for the Australian flora

Author

Falster, Daniel, Gallagher, Rachael, Wenk, Elizabeth H., Wright, Ian J., Indiarto, Dony, Andrew, Samuel C., Baxter, Caitlan, Lawson, James, Allen, Stuart, Fuchs, Anne, Monro, Anna, Kar, Fonti, Adams, Mark A., Ahrens, Collin W., Alfonzetti, Matthew, Angevin, Tara, Apgaua, Deborah M. G., Arndt, Stefan, Atkin, Owen K., Atkinson, Joe, Auld, Tony, Baker, Andrew, von Balthazar, Maria, Bean, Anthony, Blackman, Chris J., Bloomfield, Keith, Bowman, David M. J. S., Bragg, Jason, Brodribb, Timothy J., Buckton, Genevieve, Burrows, Geoff, Caldwell, Elizabeth, Camac, James, Carpenter, Raymond, Catford, Jane A., Cawthray, Gregory R., Cernusak, Lucas A., Chandler, Gregory, Chapman, Alex R., Cheal, David, Cheesman, Alexander W., Chen, Si-Chong, Choat, Brendan, Clinton, Brook, Clode, Peta L., Coleman, Helen, Cornwell, William K., Cosgrove, Meredith, Crisp, Michael, Cross, Erika, Crous, Kristine Y., Cunningham, Saul, Curran, Timothy, Curtis, Ellen, Daws, Matthew I., DeGabriel, Jane L., Denton, Matthew D., Dong, Ning, Du, Pengzhen, Duan, Honglang, Duncan, David H., Duncan, Richard P., Duretto, Marco, Dwyer, John M., Edwards, Cheryl, Esperon-Rodriguez, Manuel, Evans, John R., Everingham, Susan E., Farrell, Claire, Firn, Jennifer, Fonseca, Carlos Roberto, French, Ben J., Frood, Doug, Funk, Jennifer L., Geange, Sonya R., Ghannoum, Oula, Gleason, Sean M., Gosper, Carl R., Gray, Emma, Groom, Philip K., Grootemaat, Saskia, Gross, Caroline, Guerin, Greg, Guja, Lydia, Hahs, Amy K., Harrison, Matthew Tom, Hayes, Patrick E., Henery, Martin, Hochuli, Dieter, Howell, Jocelyn, Huang, Guomin, Hughes, Lesley, Huisman, John, Ilic, Jugoslav, Jagdish, Ashika, Jin, Daniel, Jordan, Gregory, Jurado, Enrique, Kanowski, John, Kasel, Sabine, Kellermann, Jürgen, Kenny, Belinda, Kohout, Michele, Kooyman, Robert M., Kotowska, Martyna M., Lai, Hao Ran, Laliberté, Etienne, Lambers, Hans, Lamont, Byron B., Lanfear, Robert, van Langevelde, Frank, Laughlin, Daniel C., Laugier-Kitchener, Bree-Anne, Laurance, Susan, Lehmann, Caroline E. R., Leigh, Andrea, Leishman, Michelle R., Lenz, Tanja, Lepschi, Brendan, Lewis, James D., Lim, Felix, Liu, Udayangani, Lord, Janice, Lusk, Christopher H., Macinnis-Ng, Cate, McPherson, Hannah, Magallón, Susana, Manea, Anthony, López-Martinez, Andrea, Mayfield, Margaret, McCarthy, James K., Meers, Trevor, van der Merwe, Marlien, Metcalfe, Daniel J., Milberg, Per, Mokany, Karel, Moles, Angela T., Moore, Ben D., Moore, Nicholas, Morgan, John W., Morris, William, Muir, Annette, Munroe, Samantha, Nicholson, Áine, Nicolle, Dean, Nicotra, Adrienne B., Niinemets, Ülo, North, Tom, O’Reilly-Nugent, Andrew, O’Sullivan, Odhran S., Oberle, Brad, Onoda, Yusuke, Ooi, Mark K. J., Osborne, Colin P., Paczkowska, Grazyna, Pekin, Burak, Guilherme Pereira, Caio, Pickering, Catherine, Pickup, Melinda, Pollock, Laura J., Poot, Pieter, Powell, Jeff R., Power, Sally A., Prentice, Iain Colin, Prior, Lynda, Prober, Suzanne M., Read, Jennifer, Reynolds, Victoria, Richards, Anna E., Richardson, Ben, Roderick, Michael L., Rosell, Julieta A., Rossetto, Maurizio, Rye, Barbara, Rymer, Paul D., Sams, Michael A., Sanson, Gordon, Sauquet, Hervé, Schmidt, Susanne, Schönenberger, Jürg, Schulze, Ernst-Detlef, Sendall, Kerrie, Sinclair, Steve, Smith, Benjamin, Smith, Renee, Soper, Fiona, Sparrow, Ben, Standish, Rachel J., Staples, Timothy L., Stephens, Ruby, Szota, Christopher, Taseski, Guy, Tasker, Elizabeth, Thomas, Freya, Tissue, David T., Tjoelker, Mark G., Tng, David Yue Phin, de Tombeur, Félix, Tomlinson, Kyle, Turner, Neil C., Veneklaas, Erik J., Venn, Susanna, Vesk, Peter, Vlasveld, Carolyn, Vorontsova, Maria S., Warren, Charles A., Warwick, Nigel, Weerasinghe, Lasantha K., Wells, Jessie, Westoby, Mark, White, Matthew, Williams, Nicholas S. G., Wills, Jarrah, Wilson, Peter G., Yates, Colin, Zanne, Amy E., Zemunik, Graham, and Ziemińska, Kasia

Published
2021
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