scholarly journals Spectral Characterization of Fungal Metabolites in Aqueous Medium with Humus Substances

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
D. A. Khundzhua ◽  
S. V. Patsaeva ◽  
V. A. Terekhova ◽  
V. I. Yuzhakov
Keyword(s):  
Organic Matter ◽  
Natural Waters ◽  
Culture Medium ◽  
Molecular Size ◽  
Aquatic Environments ◽  
Fungal Metabolites ◽  
Microscopic Fungi ◽  
Spectral Measurements ◽  
Humus Substances

The work is targeted to confirm participation of microscopic fungi in transformation of humus substances in aquatic environments. The research is focused on the spectroscopic study of the collection of fungal strains with different pigmentation of mycelium. Spectral properties of fungal metabolites were measured and compared to that of natural aquatic nonliving organic matter and commercial humus substances in aqueous solutions. The experiments revealed that the effect of microscopic fungi growing in the culture medium with added humate appeared as changes in the humic-type fluorescence: its characteristics became more similar to that of nonliving organic matter in natural waters than to original humate preparation. The experiments demonstrated degradation of coal-originated humate due to microbial activity into compounds of smaller molecular size and increased heterogeneity. We resume that transformation of humus substances by fungal cultures can be monitored and characterized using spectral measurements.

Characterization of organic matter in natural waters by EEM fluorescence properties

2015 ◽  
Vol 57 (6) ◽  
pp. 2428-2436 ◽  
Author(s):  
Sibel Sen-Kavurmaci ◽  
Nazmiye Cemre Birben ◽  
Ayşe Tomruk ◽  
Miray Bekbolet
Keyword(s):  
Organic Matter ◽  
Natural Waters ◽  
Fluorescence Properties ◽  
Eem Fluorescence

scholarly journals Microbial Life on the Surface of Microplastics in Natural Waters

2021 ◽  
Vol 11 (24) ◽  
pp. 11692
Author(s):  
Olena Stabnikova ◽  
Viktor Stabnikov ◽  
Andriy Marinin ◽  
Maris Klavins ◽  
Linards Klavins ◽  
...  
Keyword(s):  
Public Health ◽  
Organic Matter ◽  
Natural Organic Matter ◽  
Pathogenic Bacteria ◽  
Natural Waters ◽  
Aquatic Environments ◽  
Microbial Life ◽  
Air Interface ◽  
Key Topics ◽  
Negative Impacts

Major water-polluting microplastics (for example, polyethylene, polypropylene and others) have lower density than water. Therefore, they are concentrated in the neustonic layer near the water-air interface altogether with dissolved or colloidal natural organic matter, hydrophobic cells and spores of bacteria. This can cause environmental and public health problems because the floating micro- and nanoparticles of plastics could be coated with biofilm of hydrophobic and often putative pathogenic bacteria. Biofilm-coated microplastics are more attractive for consumption by aquatic animals than pure microplastics, and that increases the negative impacts of microplastics. So, impacts of even small quantities of microplastics in aquatic environments must be accounted for considering their accumulation in the micro-layer of water-air interphase and its interaction with bacterioneuston. Microorganisms attached to the surface of microplastic particles could interact with them, use them as substrates for growth, to change properties and biodegrade. The study of microbial life on the surface of microplastic particles is one of the key topics to understanding their role in the environment.

scholarly journals Electrospray and photoionization mass spectrometry for the characterization of organic matter in natural waters: a qualitative assessment

2009 ◽  
Vol 7 (1) ◽  
pp. 81-95 ◽  
Author(s):  
William C. Hockaday ◽  
Jeremiah M. Purcell ◽  
Alan G. Marshall ◽  
Jeffery A. Baldock ◽  
Patrick G. Hatcher
Keyword(s):  
Mass Spectrometry ◽  
Organic Matter ◽  
Natural Waters ◽  
Qualitative Assessment ◽  
Photoionization Mass Spectrometry

scholarly journals Characterization of Humic Acids from Raised Bog Peat

2014 ◽  
Vol 52 (1-2) ◽  
pp. 83-97 ◽  
Author(s):  
M. Klavins ◽  
O. Purmalis
Keyword(s):  
Organic Matter ◽  
Humic Acids ◽  
Natural Waters ◽  
Transformation Process ◽  
Hydroxyl Groups ◽  
Source Depth ◽  
Raised Bog ◽  
Phenolic Hydroxyl Groups ◽  
Coal Organic Matter

Abstract Humic substances form most of the organic component of soil, peat and natural waters, but their structure and properties are very much dependent on the source. The aim of this study was to characterize humic acids from raised bog peat to evaluate the homogeneity of humic acids isolated from the bog bodies and to study peat humification impact on the properties of humic acids. Peat humic acids (HA) have an intermediate position between the living organic matter and coal organic matter, with their structure formed in a process where the relatively labile moieties (carbohydrates, amino acids, etc.) are destroyed, and thermodynamically more stable aromatic and polycyclic structures emerge. Comparatively, the studied peat HAs were at the start of this transformation process. Concentrations of carboxyl and phenolic hydroxyl groups changed depending on the source depth of peat from which HAs were isolated. The carboxylic acidity of peat HAs increased with depth of the source and the extent of peat humification

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