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Artículos de revistas sobre el tema "Soil binding sites"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 20 de febrero de 2023

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1

Kogan, Marcelo, Alejandra Metz, and Rodrigo Ortega. "Adsorption of glyphosate in chilean soils and its relationship with unoccupied phosphate binding sites." Pesquisa Agropecuária Brasileira 38, no. 4 (April 2003): 513–19. http://dx.doi.org/10.1590/s0100-204x2003000400010.

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The objective of this work was to investigate glyphosate adsorption by soils and its relationship with unoccupied binding sites for phosphate adsorption. Soil samples of three Chilean soils series - Valdivia (Andisol), Clarillo (Inceptisol) and Chicureo (Vertisol) - were incubated with different herbicide concentrations. Glyphosate remaining in solution was determined by adjusting a HPLC method with a UV detector. Experimental maximum adsorption capacity were 15,000, 14,300 and 4,700 mg g¹ for Valdivia, Clarillo, and Chicureo soils, respectively. Linear, Freundlich, and Langmuir models were us

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2

Peng, Shimeng, Pei Wang, Lanfang Peng, Tao Cheng, Weimin Sun, and Zhenqing Shi. "Predicting Heavy Metal Partition Equilibrium in Soils: Roles of Soil Components and Binding Sites." Soil Science Society of America Journal 82, no. 4 (May 17, 2018): 839–49. http://dx.doi.org/10.2136/sssaj2018.03.0104.

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3

Gustafsson, Jon Petter, Charlotta Tiberg, Abubaker Edkymish, and Dan Berggren Kleja. "Modelling lead(II) sorption to ferrihydrite and soil organic matter." Environmental Chemistry 8, no. 5 (2011): 485. http://dx.doi.org/10.1071/en11025.

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Environmental contextLead(II) is a toxic metal pollutant with many anthropogenic sources. We show that lead(II) is bound more strongly to soil surfaces than previously understood. This knowledge may lead to better models for lead(II) dissolution from the soils, which will improve risk assessments for this metal. AbstractLead(II) adsorption to soil organic matter and iron (hydr)oxides is strong, and may control the geochemical behaviour of this metal. Here, we report the adsorption of Pb2+ (i) to 2-line ferrihydrite, and (ii) to a mor layer. The results showed that ferrihydrite has heterogeneou

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4

Naidu, R., S. Mcclure, NJ Mckenzie, and RW Fitzpatrick. "Soil solution composition and aggregate stability changes caused by long-term farming at four contrasting sites in South Australia." Soil Research 34, no. 4 (1996): 511. http://dx.doi.org/10.1071/sr9960511.

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The effect of long-term farming on the cation exchange capacity (CEC), organic carbon content, soil solution composition, and aggregate stability was investigated using contrasting soils from 4 sites in the Mid North of South Australia. Undisturbed and farmed profiles were characterised at each site. Farming led to a 10–50% decrease, approximately, in organic matter and CEC in the surface horizon. Scanning electron microscopic study of the surface and selected subsurface soils revealed poor aggregation, compaction, reduced porosity, and a decrease in aggregate particle size in the farmed surfa

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5

Ghabbour, Elham A., Geoffrey Davies, Nadeem K. Ghali, and Matthew D. Mulligan. "The effect of temperature on tight metal binding by peat and soil derived solid humic acids." Canadian Journal of Soil Science 81, no. 3 (August 1, 2001): 331–36. http://dx.doi.org/10.4141/s00-065.

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The brown biomaterials called humic acids (HA) in peats and soils retain water and bind metal cations and other solutes. Studies of the interactions of purified solid peat and soil-derived HA from different countries with metal cations in water probe HA microstructures and help to characterize the metal binding sites. Labile cations such as Caaq2+, Co aq2+, Cu aq2+, Fe aq3+, Mg aq2+ and Mn aq2+ tightly bind to solid HAs in sequential steps. The isotherms A vs. c are well fitted with the Langmuir model and plots of 1/A vs. 1/c are linear for each step. Here, A is mmol bound metal g–1 HA and c i

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6

Kayler, Z. E., M. Kaiser, A. Gessler, R. H. Ellerbrock та M. Sommer. "Application of <i>δ</i><sup>13</sup>C and <i>δ</i><sup>15</sup>N isotopic signatures of organic matter fractions sequentially separated from adjacent arable and forest soils to identify carbon stabilization mechanisms". Biogeosciences Discussions 8, № 2 (1 березня 2011): 1985–99. http://dx.doi.org/10.5194/bgd-8-1985-2011.

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Abstract. Identifying the chemical mechanisms behind soil carbon bound in organo-mineral complexes is necessary to determine the degree to which soil organic carbon is stabilized belowground. We used the δ13C and δ15N isotopic signatures from two organic matter (OM) fractions from soil to identify the likely binding mechanisms involved. We used OM fractions hypothesized to contain carbon stabilized through organo-mineral complexes: (1) OM separated chemically with sodium pyrophosphate (OM(PY)) and (2) OM stabilized in microstructures found in the chemical extraction residue (OM(ER)). Furthermo

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7

Burlakovs, Juris, Raimonds Kasparinskis, and Maris Klavins. "Leaching of Contamination from Stabilization/Solidification Remediated Soils of Different Texture." Scientific Journal of Riga Technical University. Environmental and Climate Technologies 9, no. 1 (September 1, 2012): 12–16. http://dx.doi.org/10.2478/v10145-012-0011-0.

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Abstract Development of soil and groundwater remediation technologies is a matter of great importance to eliminate historically and currently contaminated sites. Stabilization/solidification (S/S) refers to binding of waste contaminants to a more chemically stable form and thus diminishing leaching of contamination. It can be performed using cement with or without additives in order to stabilize and solidify soil with the contamination in matrix. A series of experiments were done to determine leaching properties of spiked soils of different texture bound with cement. Results of experiments sho

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8

Taillon, K. M., and W. H. Hendershot. "Measurement and modeling of surface charge and cation binding in agricultural soil." Canadian Journal of Soil Science 88, no. 5 (November 1, 2008): 749–59. http://dx.doi.org/10.4141/cjss07076.

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Models of metal adsorption have typically been developed and tested for soil components rather than whole soils and at cation concentrations higher than usual environmental conditions. This study investigates whether the non-ideal consistent competitive adsorption (NICA) model can be applied to ion binding in whole soils at low total metal concentrations. Surface charge was measured for 18 agricultural soils from southern Quebec over the pH range 3.5 to 8. The adsorption of Ca, Cd, Cu, Pb and Zn was also measured for three total metal concentrations of 2, 5 and 10 mg L-1 at pH 6 in a 0.005 M C

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9

Liu, Paiyu, Pei Wang, Yang Lu, Yang Ding, Guining Lu, Zhi Dang, and Zhenqing Shi. "Modeling kinetics of heavy metal release from field-contaminated soils: Roles of soil adsorbents and binding sites." Chemical Geology 506 (February 2019): 187–96. http://dx.doi.org/10.1016/j.chemgeo.2018.12.030.

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10

Peng, Lanfang, Zhenqing Shi, Pei Wang, Wei Li, Zhang Lin, Zhi Dang, and Donald L. Sparks. "A novel multi-reaction model for kinetics of Zn release from soils: Roles of soil binding sites." Journal of Colloid and Interface Science 514 (March 2018): 146–55. http://dx.doi.org/10.1016/j.jcis.2017.12.006.

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11

Lee, Younji, Minseok Park, and Seunghun Hyun. "Leaching Behavior of Metallic Elements from Abandoned Mine Sites in Varying Environmental Factors." Institute of Life Science and Natural Resources 30 (December 31, 2022): 87–100. http://dx.doi.org/10.33147/lsnrr.2022.30.1.87.

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Improper management of abandoned mine sites can cause heavy metal contamination of down-gradient agricultural soil, groundwater, and surface water. In this study, we investigated the effects of changes in environmental factors on the leaching behavior of the heavy metals and suggested future research direction for better risk management of the abandoned mine sites under climate change. Numerous studies showed that the concentration of heavy metals in the leachate frequently exceed the environmental criteria even though the leachable heavy metal was negligible (< 1 % of the total concentrati

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12

Adams, M. L., D. J. Hawke, N. H. S. Nilsson, and K. J. Powell. "The relationship between soil solution pH and Al3+concentrations in a range of South Island (New Zealand) soils." Soil Research 38, no. 1 (2000): 141. http://dx.doi.org/10.1071/sr98095.

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Concentrations of Al3+ were calculated in soil solutions from concentrations of the monomeric ‘reactive Al’ species ([Al3+] + [Al(OH)2+] + [Al(OH)2+] + [AlF2+]) obtained using a recently reported flow injection analysis (FIA) chelating resin technique. Soil solution samples came from 7 sites encompassing a range of New Zealand soils (Brown, Gley, Pallic, Podzol, and Recent Soils) and vegetation types (pasture, shrub lands, and indigenous and exotic forest). Previously published data from a further 7 sites, obtained using a rapid (7 s) FIA technique, were transformed to give compatible results.

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13

Longstaffe, James G., Denis Courtier-Murias, Ronald Soong, Myrna J. Simpson, Werner E. Maas, Michael Fey, Howard Hutchins, et al. "In-Situ Molecular-Level Elucidation of Organofluorine Binding Sites in a Whole Peat Soil." Environmental Science & Technology 46, no. 19 (September 12, 2012): 10508–13. http://dx.doi.org/10.1021/es3026769.

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14

Yoon, Tae H., Hichung Moon, Yeong J. Park, and Kyoung K. Park. "Investigation of Metal Binding Sites on Soil Fulvic Acid Using Eu(III) Luminescence Spectroscopy." Environmental Science & Technology 28, no. 12 (November 1994): 2139–46. http://dx.doi.org/10.1021/es00061a023.

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15

Yao, Xin, Chuntian Su, Tuantuan Fan, Haoyu Ren, and Fei Luo. "Investigating the Binding Properties between Strontium and Dissolved Organic Matter under the Influence of pH and Ca2+ in a Typical Karst Area, China." Land 11, no. 9 (August 23, 2022): 1376. http://dx.doi.org/10.3390/land11091376.

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Due to the unique hydrogeological environment of karst areas, pollutants are more likely to enter the soil and water, showing a special migration and transformation behavior. In this work, the binding behaviors between strontium (Sr2+) and dissolved organic matter (DOM) extracted from soil under the influence of pH and Ca2+ in a typical karst area were investigated by applying three-dimensional fluorescence spectroscopy combined with parallel factor analysis (EEM–PARAFAC) and two-dimensional correlation analysis (2D-COS) of synchronous fluorescence spectra (SF). The results show that DOM extra

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16

Olagoke, Folasade K., Klaus Kaiser, Robert Mikutta, Karsten Kalbitz, and Cordula Vogel. "Persistent Activities of Extracellular Enzymes Adsorbed to Soil Minerals." Microorganisms 8, no. 11 (November 16, 2020): 1796. http://dx.doi.org/10.3390/microorganisms8111796.

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Adsorption of extracellular enzymes to soil minerals is assumed to protect them against degradation, while modifying their activities at the same time. However, the persistence of the activity of adsorbed enzymes remains poorly understood. Therefore, we studied the persistence of cellulase and α-amylase activities after adsorption to soil amended with various amounts (+1, +5, and +10 wt.%) of three typical soil minerals, montmorillonite, kaolinite, and goethite. Soil without mineral addition (pure soil), pure minerals, and pure dissolved enzymes were used as references. Soil mineral–enzyme com

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17

Anđelković, Tatjana, Ružica Nikolić, Aleksandar Bojić, Darko Anđelković, and Goran Nikolić. "Binding of cadmium to soil humic acid as a function of carboxyl group content." Macedonian Journal of Chemistry and Chemical Engineering 29, no. 2 (December 15, 2010): 215. http://dx.doi.org/10.20450/mjcce.2010.168.

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The binding of Cd(II) to soil humic acid (HA) at pH 6.5 and in 0.1 mol/L KNO3 ionic medium, was studied by potentiometric titration with a cadmium ion selective electrode. The influence of carboxyl groups in cation-humic interactions was investigated by selective blocking of humic acid carboxyl groups with thionyl chloride and methanol. Infrared spectroscopic analysis confirmed that esterification took place. Differences between underivatized and derivatized HA complexation properties are ascribed to carboxyl groups. The Scatchard plots and incremental formation constants were used to obtain v

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18

Liang, Shuai, Shengguang Cao, Changrong Liu, Shah Zeb, Yu Cui, and Guoxin Sun. "Heavy metal adsorption using structurally preorganized adsorbent." RSC Advances 10, no. 12 (2020): 7259–64. http://dx.doi.org/10.1039/d0ra00125b.

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19

Bless, Aplena Elen S., Samen Baan, and Yahya Darmawan. "Spatial Distribution of Trace Elements in Rice Field at Prafi District Manokwari." Indonesian Journal of Geography 48, no. 1 (August 2, 2016): 1. http://dx.doi.org/10.22146/ijg.12430.

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Mapping spatial variability of trace elements in rice Ḁeld is necessary to obtain soil quality information to en-hance rice production. ἀis study was aimed to measure concentration and distribution of Zn, Cu, Fe, Pb, and Cd in two diᴀerent sites (SP1, SP2) of PraḀ rice Ḁeld in Manokwari West Papua. ἀe representative 26 soil samples were analysed for their available trace metal concentration (DTPA), soil pH, and C-organic and soil texture. ἀe result indicated that Fe toxicity and Zn deḀcient problems were encountered in both sites. Rice Ḁeld in SP2 was more deḀcient in Zn than SP1. Site with th

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20

Schrumpf, M., K. Kaiser, G. Guggenberger, T. Persson, I. Kögel-Knabner, and E. D. Schulze. "Storage and stability of organic carbon in soils as related to depth, occlusion within aggregates, and attachment to minerals." Biogeosciences 10, no. 3 (March 13, 2013): 1675–91. http://dx.doi.org/10.5194/bg-10-1675-2013.

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Abstract. Conceptual models suggest that stability of organic carbon (OC) in soil depends on the source of plant litter, occlusion within aggregates, incorporation in organo-mineral complexes, and location within the soil profile. Density fractionation is a useful tool to study the relevance of OC stabilization in aggregates and in association with minerals, but it has rarely been applied to full soil profiles. We aim to determine factors shaping the depth profiles of physically unprotected and mineral associated OC and test their relevance for OC stability across a range of European soils tha

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21

Oyediran, Ibrahim A., and Oluwasegun Y. Mikail. "Geotechnical Characterization and Stabilization of Gully Erosion Soils at Auchi, Anambra Basin Southeastern Nigeria." Environmental and Earth Sciences Research Journal 9, no. 3 (September 28, 2022): 90–97. http://dx.doi.org/10.18280/eesrj.090302.

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Gully erosion is a severe ecological concern in Auchi and its environs, which has led to destruction of lives and properties. Termite reworked soils have been observed to possess improved engineering properties and have over the years been used to improve soil properties. This research therefore seeks to mitigate the effects of the erosion by stabilizing the gully soils using termite-reworked soils of different genetically diverse origins. Soils from gully walls and beds from two gully erosion sites in the Auchi area and termite-reworked soils from different geological terrains were sampled. A

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22

Flemming, Hans-Curt. "Sorption sites in biofilms." Water Science and Technology 32, no. 8 (October 1, 1995): 27–33. http://dx.doi.org/10.2166/wst.1995.0256.

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The distribution of pollutants in water is strongly dependent on the processes at the solid-liquid interface, such as soprtion. The solid phase is represented by many different materials, mostly minerals but also metals and organics. In technical and natural water systems, biofilms occur to a greater or lesser extent. They will cover the underlying material (substratum) at least partially and represent a gel-type layer, mainly consisting of extracellular polymeric substances (EPS), formed by biofilm organisms, in which the latter are embedded. Thus, the sorption properties of biofilms will sig

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23

Schrumpf, M., K. Kaiser, G. Guggenberger, T. Persson, I. Kögel-Knabner, and E. D. Schulze. "Storage and stability of organic carbon in soils as related to depth, occlusion within aggregates, and attachment to minerals." Biogeosciences Discussions 9, no. 9 (September 21, 2012): 13085–133. http://dx.doi.org/10.5194/bgd-9-13085-2012.

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Abstract. Conceptual models suggest that stability and age of organic carbon (OC) in soil depends on the source of plant litter, occlusion within aggregates, incorporation in organo-mineral complexes, and location within the soil profile. Various tools like density fractionation, mineralization experiments, and radiocarbon analyses have been used to study the importance of these mechanisms. We systematically apply them to a range of European soils to test whether general controls emerge even for soils that vary in vegetation, soil types, parent material, and land use. At each of the 12 study s

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24

Sun, C. Y., J. S. Liu, Y. Wang, N. Zheng, X. Q. Wu, and Q. Liu. "Effect of long-term cultivation on soil organic carbon fractions and metal distribution in humic and fulvic acid in black soil, Northeast China." Soil Research 50, no. 7 (2012): 562. http://dx.doi.org/10.1071/sr12100.

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Cultivation affects soil organic matter and its fractions. Fulvic acid (FA) and humic acid (HA) make up an important part of soil organic matter, and their binding capacity influences heavy metal behaviour in soil. This research studied changes in soil organic components and the distribution of copper (Cu), lead (Pb), and zinc (Zn) in HA and FA affected by long-term cultivation in black soils. Uncultivated sites and their adjacent cultivated sites (18, 50, and >200 years) were selected. Alkaline sodium hydroxide/pyrophosphate extraction of humic substances and precipitation of HA by acidifi

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25

Sani, A., U. K. Adamu, B. S. Hayatu, I. A. Adam, R. W. Aliyu, M. D. Garba, J. Aliyu, H. Almu,, and N. A. Abdulkadir. "Treated wastewater irrigation effects on aggregate stability of Sandy loam soils in Semi-arid Tropical Zone of Nigeria." Global Journal of Agricultural Research 10, no. 4 (April 15, 2022): 1–15. http://dx.doi.org/10.37745/gjar.2013/vol10n4115.

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Irrigation with treated wastewater (TWW) for agricultural production is gradually becoming very important recycling option that substitutes fresh water (FW) particularly in water stressed regions like the Semi-arid Tropical zone of Nigeria. However, owing to high salt concentrations, dissolved organic matter and organic compounds found in the TWW occasionally, its application can have potential adversative impacts such as reduction of soil aggregate stability (SAS), which in turn affects soil quality. To assess the impact of TWW irrigation in comparison to FW irrigation on soils aggregation an

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26

Ahmed, Waqas, Huang Jing, Liu Kailou, Sehrish Ali, Han Tianfu, Sun Geng, Chen Jin, et al. "Impacts of long-term inorganic and organic fertilization on phosphorus adsorption and desorption characteristics in red paddies in southern China." PLOS ONE 16, no. 1 (January 29, 2021): e0246428. http://dx.doi.org/10.1371/journal.pone.0246428.

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Soil phosphorus (P) adsorption and desorption occur in an important endogenous cycle linked with soil fertility problems and relevant to the environmental risk assessment of P. In our study, the effect of long-term inorganic and organic fertilization on P adsorption and desorption characteristics in relation to changes in soil properties was evaluated by selecting three long-term experimental sites in southern China. The selected treatments at each site were CK (unfertilized), NPK (synthetic nitrogen, phosphorus and potassium) and NPKM (synthetic NPK plus manure). The adsorption and desorption

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27

Meychik, Nataly, Yuliya Nikolaeva, Maria Kushunina, and Igor Yermakov. "Are the carboxyl groups of pectin polymers the only metal-binding sites in plant cell walls?" Plant and Soil 381, no. 1-2 (April 16, 2014): 25–34. http://dx.doi.org/10.1007/s11104-014-2111-z.

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28

Da Silva, Joaquim C. G. Esteves, and Adélio A. S. C. Machado. "Interaction of Fulvic Acids with Al(III) Studied by Self-Modeling Curve Resolution of Second-Derivative Synchronous Fluorescence Spectra." Applied Spectroscopy 50, no. 4 (April 1996): 436–43. http://dx.doi.org/10.1366/0003702963906050.

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The interaction of Al(III) with two samples of fulvic acids (fua), extracted from materials present in a pinewood soil (fua2 from the upper soil horizon, or leaf litter, and fua3 from lower soil horizons), was followed by synchronous fluorescence (SyF) spectroscopy at pH 4. The variations observed in the inverted second-derivative spectral data were analyzed by SIMPLISMA, a self-modeling curve resolution technique. Three binding sites were detected for each fua sample, and their spectra and SyF intensity profiles were obtained. Conditional stability constants for coordination of one binding si

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Ghabbour, E. A., G. Davies, R. L. Dunfee, N. A. Smith, and M. E. Vozzell. "Adsorption of nucleic acid constituent uracil on copper(II)-loaded, solid peat and soil-derived humic acids." Canadian Journal of Soil Science 81, no. 3 (August 1, 2001): 309–16. http://dx.doi.org/10.4141/s00-066.

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Humic acids (HA) in compost, peats and soils sorb organic compounds selectively. This paper investigates the micro- and macroscopic properties of solid HAs isolated from a German peat (GHA) and a New Hampshire soil (NHA) using tightly bound copper(II) and nucleic acid constituent uracil adsorption as analytical probes. Isotherm measurements at 5.0–35.0°C show that tightly bound Cu(II) decreases the amount of uracil adsorbed by GHA at mM or lower uracil concentrations whereas previous work revealed the opposite effect for bound Hg(II). Site capacity comparisons are consistent with lower coordin

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30

Beauchemin, Suzanne, and R. R. Simard. "Soil phosphorus saturation degree: Review of some indices and their suitability for P management in Québec, Canada." Canadian Journal of Soil Science 79, no. 4 (November 1, 1999): 615–25. http://dx.doi.org/10.4141/s98-087.

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Many agricultural fields contain excessive labile soil P in regard to crop needs. Its environmental fate must be assessed. The concept of P saturation degree is meaningful as it describes the portion of the soil binding sites already covered with P, and indicates the potential desorbability of soil P. The first objective of this study was to review different indices that have been proposed to estimate the degree of soil P saturation and the relationships between soil P saturation degree and P solubility. The second objective is to discuss their suitability as environmental indicators for P man

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31

Schilling, M., and W. T. Cooper. "Identification of Copper Binding Sites in Soil Organic Matter through Chemical Modifications and13C CP-MAS NMR Spectroscopy." Environmental Science & Technology 38, no. 19 (October 2004): 5059–63. http://dx.doi.org/10.1021/es049653w.

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32

Fischer, P., R. Pöthig, B. Gücker, and M. Venohr. "Estimation of the degree of soil P saturation from Brazilian Mehlich-1 P data and field investigations on P losses from agricultural sites in Minas Gerais." Water Science and Technology 74, no. 3 (May 31, 2016): 691–97. http://dx.doi.org/10.2166/wst.2016.169.

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The degree of phosphorus saturation (DPS) of agricultural soils is studied worldwide for risk assessment of phosphorus (P) losses. In previous studies, DPS could be reliably estimated from water-soluble P (WSP) for European and Brazilian soils. In the present study, we correlated measured WSP and Mehlich-1 P (M1P) from soils of Minas Gerais (MG) and Pernambuco (PE) (R2 = 0.94, n = 59) to create a DPS map from monitoring data. The resulting DPS map showed high spatial variability and low values of DPS (54 ± 22%, mean and standard deviation; n = 1,827). Measured soil DPS values amounted to 63 ±

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Li, Jian, Andrew W. Rate, and Robert J. Gilkes. "Silver ion desorption kinetics from iron oxides and soil organic matter: effect of adsorption period." Soil Research 42, no. 1 (2004): 59. http://dx.doi.org/10.1071/sr03056.

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In order to have a better understanding of the mobility and bioavailability of silver in the environment, it is important to investigate the desorption behaviour of silver from some environmentally relevant soil components. Four single soil constituents (charcoal, humic acid, ferrihydrite, goethite) were chosen to investigate the rate of desorption of silver ions. The effect of reaction period between silver and the soil constituents on subsequent desorption was also investigated. A significant proportion of Ag+ sorbed by Fe oxides, humic acid, and charcoal cannot readily be desorbed back into

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34

Henderson, Keri L. D., Jason B. Belden, Shaohan Zhao, and Joel R. Coats. "Phytoremediation of Pesticide Wastes in Soil." Zeitschrift für Naturforschung C 61, no. 3-4 (April 1, 2006): 213–21. http://dx.doi.org/10.1515/znc-2006-3-410.

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Soils at agrochemical dealer sites often are contaminated with pesticide residues from decades of accidental and incidental spillage. We have determined that prairie grasses native to the Midwestern U.S. are suitable for phytoremediation because they are tolerant of most herbicides and of climatic extremes, such as heat, cold, drought, and flooding. A mixed stand of big bluestem, switch grass, and yellow indiangrass develops a rhizosphere with microflora that can readily detoxify pesticide residues. Specific atrazine-degrading bacteria or the free enzyme atrazine chlorohydrolase also can enhan

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35

Vlădoiu, Diana Larisa, Marioara Nicoleta Filimon, Vasile Ostafe, and Adriana Isvoran. "Effects Of Herbicides And Fungicides On The Soil Chitinolytic Activity. A Molecular Docking Approach." Ecological Chemistry and Engineering S 22, no. 3 (September 1, 2015): 439–50. http://dx.doi.org/10.1515/eces-2015-0025.

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Abstract A molecular docking study was undertaken using the programs SwissDock and PatchDock to assess the interactions of the bacterial chitinases belonging to the GH18 and GH19 families with two herbicides (chlorsulfuron and nicosulfuron) and two fungicides (difenoconazole and drazoxolon). Both molecular docking programs predict that all considered pesticides bind to the active sites of chitinases produced by soil microorganisms. There are correlations for predicted binding energy values for receptor-ligand complexes obtained using the two programs consolidating the prediction of the chitina

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Esteves da Silva, Joaquim CG, Adélio ASC Machado, Miguel A. Ferreira, and Francisco Rey. "Method for the differentiation of leaf litter extracts and study of their interaction with Cu(II) by molecular fluorescence." Canadian Journal of Chemistry 76, no. 8 (August 1, 1998): 1197–209. http://dx.doi.org/10.1139/v98-150.

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Six leaf litter extracts (LLE) (eucalyptus (Eucaliptus globulus), fern (Pteridium aquilinium), oak (Quercus robur), chestnut (Castanea sátiva), laurel (Laurus nobilis), and ulex (Ulex europoeus) canopies) were isolated following an extraction procedure similar to that used for fulvic acids (FA) and were characterized by elemental analysis and UV-Vis, FT-IR, and synchronous molecular fluorescence (SyF) spectroscopies. Moreover, information about their interaction with the Cu(II) ion in aqueous solution (100 mg yL of LLE in 0.1 M KNO3 at pH = 6) was obtained from the measurement of SyF spectra a

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Baumgarth, Birgit, Frank Wilco Bartels, Dario Anselmetti, Anke Becker, and Robert Ros. "Detailed studies of the binding mechanism of the Sinorhizobium meliloti transcriptional activator ExpG to DNA." Microbiology 151, no. 1 (January 1, 2005): 259–68. http://dx.doi.org/10.1099/mic.0.27442-0.

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The exopolysaccharide galactoglucan promotes the establishment of symbiosis between the nitrogen-fixing Gram-negative soil bacterium Sinorhizobium meliloti 2011 and its host plant alfalfa. The transcriptional regulator ExpG activates expression of galactoglucan biosynthesis genes by direct binding to the expA1, expG/expD1 and expE1 promoter regions. ExpG is a member of the MarR family of regulatory proteins. Analysis of target sequences of an ExpG(His)6 fusion protein in the exp promoter regions resulted in the identification of a binding site composed of a conserved palindromic region and two

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Rosenberg, Michael G. "Clindamycin." Pediatrics In Review 17, no. 10 (October 1, 1996): 373–74. http://dx.doi.org/10.1542/pir.17.10.373.

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Clindamycin (CM) is a chemically synthesized derivative of lincomycin, which originally was isolated from the soil actinomycete Streptomyces lincolnesis in 1962. CM essentially has replaced lincomycin therapeutically because of its broader antimicrobial spectrum and enhanced gastrointestinal absorption. CM inhibits bacterial protein synthesis by binding to the 50S subunit of the bacterial ribosome, thereby blocking peptide chain initiation and elongation. CM functions as a bacteriostatic agent; however, in certain clinical situations, it can be considered bactericidal. Interestingly, the ribos

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Chung, Kun H., Seog W. Rhee, Hyun S. Shin, and Christopher H. Moon. "Probe of cadmium(II) binding on soil fulvic acid investigated by 113Cd NMR spectroscopy." Canadian Journal of Chemistry 74, no. 7 (July 1, 1996): 1360–65. http://dx.doi.org/10.1139/v96-152.

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Binding of cadmium(II) on soil fulvic acid (FA) was investigated over a range of fulvate-to-cadmium concentration ratios (8 – 59 equiv. mol−1) using 113Cd NMR spectroscopy. The 113Cd chemical shift of cadmium bound on fulvate was observed in a more downfield region (δ −20.4 to −15.6) than that bound on synthetic polymers, poly(acrylic acid) (PAA: δ −36.6 to −38.2), poly(methacrylic acid) (PMAA: δ −34.0 to −25.4), and poly(vinyl benzoic acid) (PVBA: δ −34.7 to −31.2). The calculated values of individual chemical shifts for the species CdL+ and CdL2 (L: carboxylate) formed in Cd(II)–carboxylate

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Tabassum, Noshabah, Uzaira Rafique, Khaled S. Balkhair, and Muhammad Aqeel Ashraf. "Chemodynamics of Methyl Parathion and Ethyl Parathion: Adsorption Models for Sustainable Agriculture." BioMed Research International 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/831989.

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The toxicity of organophosphate insecticides for nontarget organism has been the subject of extensive research for sustainable agriculture. Pakistan has banned the use of methyl/ethyl parathions, but they are still illegally used. The present study is an attempt to estimate the residual concentration and to suggest remedial solution of adsorption by different types of soils collected and characterized for physicochemical parameters. Sorption of pesticides in soil or other porous media is an important process regulating pesticide transport and degradation. The percentage removal of methyl parat

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41

Xia, Kang, William Bleam, and Philip A. Helmke. "Studies of the nature of Cu2+ and Pb2+ binding sites in soil humic substances using X-ray absorption spectroscopy." Geochimica et Cosmochimica Acta 61, no. 11 (June 1997): 2211–21. http://dx.doi.org/10.1016/s0016-7037(97)00079-3.

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Mittal, Sheenu, and Lee Kroos. "Combinatorial Regulation by a Novel Arrangement of FruA and MrpC2 Transcription Factors during Myxococcus xanthus Development." Journal of Bacteriology 191, no. 8 (February 6, 2009): 2753–63. http://dx.doi.org/10.1128/jb.01818-08.

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ABSTRACT Myxococcus xanthus is a gram-negative soil bacterium that undergoes multicellular development upon nutrient limitation. Intercellular signals control cell movements and regulate gene expression during the developmental process. C-signal is a short-range signal essential for aggregation and sporulation. C-signaling regulates the fmgA gene by a novel mechanism involving cooperative binding of the response regulator FruA and the transcription factor/antitoxin MrpC2. Here, we demonstrate that regulation of the C-signal-dependent fmgBC operon is under similar combinatorial control by FruA

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Feria-Cáceres, Pedro F., Lucas Penagos-Velez, and Claudia X. Moreno-Herrera. "Tolerance and Cadmium (Cd) Immobilization by Native Bacteria Isolated in Cocoa Soils with Increased Metal Content." Microbiology Research 13, no. 3 (August 14, 2022): 556–73. http://dx.doi.org/10.3390/microbiolres13030039.

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Twelve cadmium native bacteria previously isolated in soils of cocoa farms located in the western Colombian Andes (Santander), and tolerant to 2500 µM CdCl2 (120 mg Cd/L), were chosen in order to test their tolerance and Cd immobilization using liquid culture medium (Nutritive broth) at different concentrations of heavy metals. Furthermore, in the greenhouse experiments, the strains Exiguobacterium sp. (11-4A), Klebsiella variicola sp. (18-4B), and Enterobacter sp. (29-4B) were applied in combined treatments using CCN51 cacao genotype seeds grown in soil with different concentrations of Cd. Al

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Johan, Prisca Divra, Osumanu Haruna Ahmed, Nur Aainaa Hasbullah, Latifah Omar, Puvan Paramisparam, Nur Hidayah Hamidi, Mohamadu Boyie Jalloh, and Adiza Alhassan Musah. "Phosphorus Sorption following the Application of Charcoal and Sago (Metroxylon sagu) Bark Ash to Acid Soils." Agronomy 12, no. 12 (November 29, 2022): 3020. http://dx.doi.org/10.3390/agronomy12123020.

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Acidic cations such as Al, Fe, and Mn tend to fix P in soils, and this reaction make P unavailable for plant uptake. Several conventional strategies for farmers had been proposed to ameliorate Al toxicity either via liming or continuous P fertilization. However, these approaches are not only expensive but are also environmental unfriendly. Thus, a sorption study was carried out using charcoal and sago bark ash as soil amendments to determine their effects on P sorption characteristics of low pH soils. Phosphorus sorption determination was based on standard procedures and the P adsorption data

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Ruan, Rujue, Zhifang Jiang, Yuhuan Wu, Maojun Xu, and Jun Ni. "High-throughput sequence analysis reveals variation in the relative abundance of components of the bacterial and fungal microbiota in the rhizosphere of Ginkgo biloba." PeerJ 7 (November 15, 2019): e8051. http://dx.doi.org/10.7717/peerj.8051.

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Background The narrow region of soil, in contact with and directly influenced by plant roots, is called the rhizosphere. Microbes living in the rhizosphere are considered to be important factors for the normal growth and development of plants. In this research, the structural and functional diversities of microbiota between the Ginkgo biloba root rhizosphere and the corresponding bulk soil were investigated. Methods Three independent replicate sites were selected, and triplicate soil samples were collected from the rhizosphere and the bulk soil at each sampling site. The communities of bacteri

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Rigane, E., R. Dutoit, S. Matthijs, N. Brandt, S. Flahaut, and K. S. Belghith. "Characterization of Putative Virulence Factors of Pseudomonas aeruginosa Strain RBS Isolated from a Saltern, Tunisia: Effect of Metal Ion Cofactors on the Structure and the Activity of LasB." BioMed Research International 2020 (July 23, 2020): 1–13. http://dx.doi.org/10.1155/2020/6047528.

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Pseudomonas aeruginosa is a ubiquitous Gram-negative bacterium able to survive in diverse environments such as soil, plants, freshwater, and seawater. P. aeruginosa can be an opportunistic pathogen to humans when their immune system is deficient. Its pathogenicity may be linked to the production of virulence factors. We isolated P. aeruginosa strain RBS from the saltern of Sfax in Tunisia. In this study, we characterized the halotolerance, antibiotic susceptibility, and some virulence factors of strain RBS. High NaCl concentrations inhibited growth and motility. However, biofilm formation was

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Jeong, Buyun, Jinsung An, and Kyoungphile Nam. "Time series analysis for determining ecologically acceptable Cu concentration from species sensitivity distribution with biotic ligand models in soil pore water." Environmental Engineering Research 26, no. 2 (April 3, 2020): 200021–0. http://dx.doi.org/10.4491/eer.2020.021.

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A site-specific, ecologically acceptable concentration of Cu in soil pore water was determined with four trophic levels of soil-residing organisms. Specifically, soil pore water was periodically collected from a site contaminated with heavy metals using in-situ samplers. Dissolved Cu concentration, Ca2+, Mg2+, Na+, K+, Cl-, SO42-, NO3-, dissolved organic carbon, pH, and temperature were analyzed to derive a half-maximal effective concentration of Cu (EC50[Cu]T) using a biotic ligand model (BLM). The BLM parameters, such as binding constants (logKXBL) and the fraction of biotic ligand sites occ

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Pelfrene, Aurélie, and Nathalie Gassama. "Competition between particles and dissolved organic matter for trace metal binding in unpolluted soil solutions: Monitoring and thermodynamic approaches." Bulletin de la Société Géologique de France 183, no. 3 (May 1, 2012): 189–201. http://dx.doi.org/10.2113/gssgfbull.183.3.189.

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Abstract In this study, monitoring and thermodynamic approaches were combined in order to identify the dominant features, which control the speciation of Cd, Cu, Pb, and Zn in solutions from unpolluted planosolic soil (North Massif Central, France). Three sites were selected according to topography and monitored from January to May 2006 using piezometers. The sandy-loam to clay-loam organic-rich horizon (horizon A) and the gravely and concretion-rich horizon (horizon E) were chosen to assess the potential impact of type of horizon on the chemical speciation of metals in the soil solutions. Bin

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Hur, Jin, and Bo-Mi Lee. "Comparing the Heterogeneity of Copper-Binding Characteristics for Two Different-Sized Soil Humic Acid Fractions Using Fluorescence Quenching Combined with 2D-COS." Scientific World JOURNAL 11 (2011): 1865–76. http://dx.doi.org/10.1100/2011/640598.

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Heterogeneous distributions of copper-binding characteristics were compared for two ultrafiltered size fractions of a soil HA using fluorescence quenching combined with two-dimensional correlation spectroscopy (2D-COS). The apparent shapes of the original synchronous fluorescence spectra and the extent of the fluorescence quenching upon the addition of copper were similar for the two fractions. The stability constants calculated at their highest peaks were not significantly different. However, the 2D-COS results revealed that the fluorescence quenching behaviors were strongly affected by the a

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Lisevich, Irina, Dmitrii Lukianov, Daniel Wilson, Petr Sergiev, Olga Dontsova, and Ilya Osterman. "Abstract OR-4: New Antibiotic Binding Site on the 30S Ribosomal Subunit." International Journal of Biomedicine 11, Suppl_1 (June 1, 2021): S8—S9. http://dx.doi.org/10.21103/ijbm.11.suppl_1.or4.

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Background: Antibiotic resistance becomes one of the main problems of modern medicine; therefore, the development of new antibacterial compounds is absolutely necessary. The ribosome is the target for a lot of different antibiotics; there are several main binding sites on the ribosome – decoding center, peptidyl-transferase center, and ribosome exit tunnel. Modification or mutation of nucleotides in these sites could make cells resistant to structurally different antibiotics. Methods: pDualrep2 reporter system was used for detection of the protein synthesis inhibitors in cultural broths of new

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