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@ARTICLE{Gargiulo:3548,
author = {Gargiulo, G. and Bradford, S.A. and Simunek, J. and
Ustohal, P. and Vereecken, H. and Klumpp, E.},
title = {{B}acteria {T}ransport and {D}eposition under {U}nsaturated
{F}low {C}onditions: {T}he {R}ole of {W}ater {C}ontent and
{B}acteria {S}urface {H}ydrophobicity},
journal = {Vadose zone journal},
volume = {7},
issn = {1539-1663},
address = {Madison, Wis.},
publisher = {SSSA},
reportid = {PreJuSER-3548},
pages = {406 - 419},
year = {2008},
note = {Record converted from VDB: 12.11.2012},
abstract = {Column experiments were conducted to investigate the
transport and deposition behavior of representative
hydrophobic and hydrophilic bacteria strains in sand at
different water saturations. These strains are similar in
surface charge, shape, and size, and differ primarily in
their surface hydrophobicity and tendency to form
aggregates. The amount of bacteria that were retained in the
sand increased with decreasing water saturation, especially
for the more hydrophobic strain that formed larger cell
aggregates. Most of the cells were retained close to the
column inlet, and the rate of deposition rapidly decreased
with depth. The experimental data were analyzed using a
mathematical model that accounted for deposition on two
kinetic sites. Consideration of depth-dependent deposition
in the model formulation significantly improved the
description of the data, and the amount of cell retention
was typically dominated by this site. The depth-dependent
deposition coefficient tended to increase with decreasing
water content, especially for the hydrophobic bacteria.
Straining is believed to account for these observations
because it increases in magnitude with increasing cell and
aggregate size and when a greater fraction of the water
flows through a larger number of small pore spaces with
decreasing water content. Cell retention on the other
kinetic deposition site was well described using a
conventional model for attachment and detachment. Consistent
with interaction energy calculations for bacteria
attachment, however, low amounts of cell retention occurred
on this site. Attempts to separately determine the amounts
of attachment to solid-water and air-water interfaces were
confounded by the influence of straining.},
keywords = {J (WoSType)},
cin = {ICG-4 / JARA-ENERGY},
ddc = {550},
cid = {I:(DE-Juel1)VDB793 / $I:(DE-82)080011_20140620$},
pnm = {Terrestrische Umwelt},
pid = {G:(DE-Juel1)FUEK407},
shelfmark = {Environmental Sciences / Soil Science / Water Resources},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000256204600002},
doi = {10.2136/vzj2007.0068},
url = {https://juser.fz-juelich.de/record/3548},
}