Results 251 to 260 of about 64,537 (313)

Climate and Landscape Controls on Dissolved Organic Matter in Wetland‐Dominated Catchments of the Boreal Plains, Canada

Hydrological Processes, Volume 40, Issue 5, May 2026.
In the subhumid, wetland‐rich, geologically heterogeneous Boreal Plains region of Canada, we found several controls on stream DOC concentration ([DOC]) and DOM composition: An increase in [DOC] and aromaticity as temperature increases throughout the summer, with temperature trend prevailing over the influence of discharge.
Julia Orlova, Kevin J. Devito, Suzanne E. Tank, David Olefeldt   +3 more
wiley   +1 more source

Reconstructing the Holocene explosive eruptive history of the Erciyes volcano (Turkey) using proximal and distal tephra records

Journal of Quaternary Science, Volume 41, Issue 4, Page 645-659, May 2026.
ABSTRACT Mount Erciyes, the largest active volcano of Central Anatolia (Turkey), erupted explosively during the Holocene, producing the Karagüllü, Perikartin and Dikkartin tuff rings. Even though major cities like Kayseri and its ~1 million residents sit directly on these pyroclastic deposits, the timing and magnitude of the explosive eruptions have ...
Ivan Sunyé‐Puchol, Rengin Özsoy‐Ünal, Xavier Bolós, Victoria C. Smith, Efe Akkas, Lorenzo Tavazzani, Jan Aymerich, Manuela Nazzari, Pierre Lacan, Victoria Cullen, Olivier Bachmann, Piergiorgio Scarlato, Silvio Mollo   +12 more
wiley   +1 more source

Phytochemical content, antioxidant and antibacterial properties of Typhonium flagelliforme cultivated via soil and hydroponic methods

JSFA reports, Volume 6, Issue 5, Page 179-192, May 2026.
Abstract Background Typhonium flagelliforme is a medicinal herb in the Araceae family, widely distributed in Southeast Asia. This study aimed to evaluate the effects of hydroponic and soil‐based cultivation systems on the phytochemical content and bioactivity of T. flagelliforme. Results Using liquid chromatography‐mass spectrometry (LC‐MS) analysis, 9
Yen Ning Lee, Norsharina Md Saad, Siti Rokhiyah Ahmad Usuldin, Seetha Jaganathan King, Wee Sim Choo   +4 more
wiley   +1 more source

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Nature of Humic Acids

Nature, 1963
THE idea that humic acids are heteropolycondensates1 of phenolic substances with or without the participation of amino-acids is now widely accepted. Three possible sources of the phenols are postulated: (1) phenolic materials such as flavonoids leached from the plant debris; (2) phenolic units formed during the decomposition of lignin; (3) phenolic ...
A, BURGES, H M, HURST, S B, WALKDEN, F M, DEAN, M, HIRST   +4 more
openaire   +2 more sources

Iodide binding by humic acid

Environmental Toxicology and Chemistry, 1991
Abstract Iodide binding by humic acid was studied. The reaction was dose, temperature and pH dependent. A maximum binding of 88% was reached with 2 mg humic acid in 0.15 M Tris buffer. The efficiency of iodide binding by the buffer becomes higher whenever the buffer is slightly alkaline.
Tien-Shang Huang, Fung-Jou Lu
openaire   +1 more source

Americium Binding to Humic Acid

Environmental Science & Technology, 2001
The binding of americium (Am) by peat humic acid (PHA) has been investigated at Am concentrations between 10(-1) and 10(-7) M at pH approximately 2.6 in the presence and absence of Cu as a competing ion. Cu-PHA binding was also investigated in order to derive independent binding constants for use in modeling the competitive binding studies.
Peters, Adam J., Hamilton-Taylor, John, Tipping, Edward   +2 more
openaire   +2 more sources

Electrochemical degradation of humic acid

Science of The Total Environment, 2000
The treatment of natural water for drinking water production goes through the degradation of humic substances. In this study, humic acid, extracted from a peat area located at the margins of the Mogi Guaçu River at São Paulo State, Brazil, was used to perform electro-oxidation essays in order to evaluate the possibilities of electrochemical methods in ...
A J, Motheo, L, Pinhedo
openaire   +2 more sources

Desmutagenic effect of humic acid

Mutation Research, 1986
In the present study, humic acid was not found to be mutagenic and did not inhibit spontaneous mutation. It did, however, inhibit the mutagenicities of benzo[a]pyrene and 3-aminoanthracene (+S9 mix), but not the mutagenicities of 4NQO, AF-2 and MNNG (-S9 mix).
T, Sato, Y, Ose, H, Nagase
openaire   +2 more sources

Sorption of humic acids by bacteria

Microbiology, 2013
Capacity for sorption of humic acid (HA) from water solutions was shown for 38 bacterial strains. Isotherms of HA sorption were determined for the cells of 10 strains. The bonding strength between the cells and HA (k) and the terminal adsorption (Q(max)) determined from the Langmuir equation for gram-positive and gram-negative bacteria were reliably ...
V V, Tikhonov, D S, Orlov, O V, Lisovitskaia, Iu A, Zavgorodniaia, B A, Byzov, V V, Demin   +5 more
openaire   +2 more sources

Electrophoretic aggregation of humic acid

Journal of Chromatography A, 2004
Capillary electrophoresis (CE) has been used to characterize humic acid (HA) aggregation. It was found that when pumping HA solution through the capillary at a constant flow rate with no electric field, the number of spikes could be reduced by filtration of the solution. Applying high voltage (30 kV), the amount of spikes increased again.
Monika, Ubner, Viia, Lepane, Margus, Lopp, Mihkel, Kaljurand   +3 more
openaire   +2 more sources