scholarly journals Assessment of geotechnical and physico-chemical properties of age-long greywater-contaminated soils in basement complex areas, southwest Nigeria

2020 ◽  
Vol 10 (5) ◽  
Author(s):  
S. A. Ganiyu ◽  
K. S. Are ◽  
O. T. Olurin
Keyword(s):  
Contaminated Soils ◽  
Chemical Properties ◽  
Basement Complex ◽  
Physico Chemical ◽  
Southwest Nigeria

scholarly journals Response of Avena sativa L. and the soil microbiota to the contamination of soil with Shell diesel oil

2018 ◽  
Vol 64 (No. 3) ◽  
pp. 102-107 ◽  
Author(s):  
Borowik Agata ◽  
Wyszkowska Jadwiga
Keyword(s):  
Avena Sativa ◽  
Contaminated Soils ◽  
Dry Matter ◽  
Rapid Development ◽  
Chemical Properties ◽  
Diesel Oil ◽  
Barley Straw ◽  
Physico Chemical ◽  
Organotrophic Bacteria ◽  
Nutritional Needs

This study analysed the changes in the development of Avena sativa L. cultivated on soil contaminated with diesel oil (DO; 0, 7, 14 and 21 mL/kg of soil dry matter), and in the microbiological, biochemical, chemical and physico-chemical properties of the soil. In addition to basic fertilisation fulfilling the nutritional needs of the oat plant, finely ground barley straw and finely ground charcoal was also applied. The study revealed a highly toxic effect of DO on the growth and development of Avena sativa L. The uptake of macro- and micronutrients by the tested plant decreased significantly. The active bacteria were identified based on the analysis of 16S rRNA coding sequences. In objects contaminated with DO, a more rapid development of organotrophic bacteria, actinomyces and fungi was observed, as well as higher activity of dehydrogenases, catalase, urease, acid phosphatase, alkaline phosphatase and β-glucosidase. In the soils contaminated with DO, more C<sub>org</sub> and available and exchangeable potassium were found than in the non-contaminated soils. DO did not have such a significant effect on the contents of other elements in the soil. The use of charcoal and straw stimulated both the development of microorganisms and the activity of soil enzymes, yet it did not mitigate the adverse effect of DO on the growth or development of the oat plant.

scholarly journals Molecular Characterization of Fungal Biodiversity in Long-Term Polychlorinated Biphenyl-Contaminated Soils

2021 ◽  
Vol 9 (10) ◽  
pp. 2051
Author(s):  
Camille Marchal ◽  
Joaquim Germain ◽  
Muriel Raveton ◽  
Blandine Lyonnard ◽  
Cindy Arnoldi ◽  
...  
Keyword(s):  
Contaminated Soils ◽  
Penicillium Chrysogenum ◽  
High Throughput Sequencing ◽  
Polychlorinated Biphenyl ◽  
Chemical Properties ◽  
Fungal Communities ◽  
Penicillium Canescens ◽  
Polluted Soils ◽  
Physico Chemical ◽  
The Impact

Polychlorinated biphenyls (PCBs) belong to the organic pollutants that are toxic to humans and harmful to environments. Numerous studies dealing with the impact of PCBs on soil microorganisms have focused on bacterial communities. The effects of PCBs on fungal communities in three different PCB-polluted soils from former industrial sites were investigated using high-throughput sequencing of the internal transcribed spacer 1 region. Significant differences in fungal alpha diversity were observed mainly due to soil physico-chemical properties. PCBs only influenced the richness of the fungal communities by increasing it. Fungal composition was rather strongly influenced by both PCBs and soil properties, resulting in different communities associated with each soil. Sixteen Ascomycota species were present in all three soils, including Stachybotrys chartarum, Fusarium oxysporum, Penicillium canescens, Penicillium chrysogenum,Penicillium citrosulfuratum and Penicillium brevicompactum, which are usually found in PCB-polluted soils, and Fusarium solani, Penicillium canescens, Penicillium citrosulfuratum and Penicillium chrysogenum, which are known PCB degraders. This study demonstrated that PCBs influence the richness and the composition of fungal communities. Their influence, associated with that of soil physico-chemical properties, led to distinct fungal communities, but with sixteen species common to the three soils which could be considered as ubiquitous species in PCB-polluted soils.

Decoration of specific sites on freeze-fractured membranes

1978 ◽  
Vol 36 (2) ◽  
pp. 140-141
Author(s):  
H. Gross ◽  
H. Moor
Keyword(s):  
Pure Water ◽  
Freeze Fracture ◽  
Chemical Properties ◽  
Surface Forces ◽  
Sulfate Pentahydrate ◽  
Copper Sulfate Pentahydrate ◽  
Physico Chemical ◽  
Water Of Hydration ◽  
Small Container ◽  
Binding Forces

Fracturing under ultrahigh vacuum (UHV, p ≤ 10-9 Torr) produces membrane fracture faces devoid of contamination. Such clean surfaces are a prerequisite foe studies of interactions between condensing molecules is possible and surface forces are unequally distributed, the condensate will accumulate at places with high binding forces; crystallites will arise which may be useful a probes for surface sites with specific physico-chemical properties. Specific “decoration” with crystallites can be achieved nby exposing membrane fracture faces to water vopour. A device was developed which enables the production of pure water vapour and the controlled variation of its partial pressure in an UHV freeze-fracture apparatus (Fig.1a). Under vaccum (≤ 10-3 Torr), small container filled with copper-sulfate-pentahydrate is heated with a heating coil, with the temperature controlled by means of a thermocouple. The water of hydration thereby released enters a storage vessel.

PHYSICO CHEMICAL PROPERTIES OF NICKEL OXIDE AT HIGH TEMPERATURE

1976 ◽  
Vol 37 (C7) ◽  
pp. C7-438-C7-442 ◽  
Author(s):  
R. FARHI ◽  
G. PETOT-ERVAS
Keyword(s):  
High Temperature ◽  
Nickel Oxide ◽  
Chemical Properties ◽  
Physico Chemical

Physico-Chemical Properties of Recombinant Desulphatohirudin

1990 ◽  
Vol 63 (03) ◽  
pp. 499-504 ◽  
Author(s):  
A Electricwala ◽  
L Irons ◽  
R Wait ◽  
R J G Carr ◽  
R J Ling ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Gel Filtration ◽  
Chemical Properties ◽  
Alpha Helix ◽  
Apparent Molecular Weight ◽  
Correlation Spectroscopy ◽  
Nmr Studies ◽  
Recombinant Hirudin ◽  
Physico Chemical ◽  
Recombinant Molecule

SummaryPhysico-chemical properties of recombinant desulphatohirudin expressed in yeast (CIBA GEIGY code No. CGP 39393) were reinvestigated. As previously reported for natural hirudin, the recombinant molecule exhibited abnormal behaviour by gel filtration with an apparent molecular weight greater than that based on the primary structure. However, molecular weight estimation by SDS gel electrophoresis, FAB-mass spectrometry and Photon Correlation Spectroscopy were in agreement with the theoretical molecular weight, with little suggestion of dimer or aggregate formation. Circular dichroism studies of the recombinant molecule show similar spectra at different pH values but are markedly different from that reported by Konno et al. (13) for a natural hirudin-variant. Our CD studies indicate the presence of about 60% beta sheet and the absence of alpha helix in the secondary structure of recombinant hirudin, in agreement with the conformation determined by NMR studies (17)

Physico-chemical properties of the rare-earth metals, scandium, and yttrium

1963 ◽  
Vol 79 (2) ◽  
pp. 263-293 ◽  
Author(s):  
E.M. Savitskii ◽  
V.F. Terekhova ◽  
O.P. Naumkin
Keyword(s):  
Rare Earth ◽  
Rare Earth Metals ◽  
Chemical Properties ◽  
Physico Chemical ◽  
The Rare Earth
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