Fluoride-induced changes in chemical properties and microbial activity of mull, moder and mor soils

1987 ◽  
Vol 5 (1) ◽  
Author(s):  
B.M. Wilke
Keyword(s):  
Microbial Activity ◽  
Chemical Properties ◽  
Induced Changes

scholarly journals Assessing the Effect of Different Agroforestry Practices on Soil Physico-chemical Properties and Microbial Activity

2020 ◽  
Vol 9 (9) ◽  
pp. 2802-2816
Author(s):  
Baswant Sushant Pralhad ◽  
P. Rajendran ◽  
M. P. Divya ◽  
R. Rajeswari ◽  
G. Thangamani ◽  
...  
Keyword(s):  
Microbial Activity ◽  
Chemical Properties ◽  
Physico Chemical ◽  
Agroforestry Practices

Bioturbation, microbial activity and sediment properties in an estuarine ecosystem

1986 ◽  
Vol 90 ◽  
pp. 129-142 ◽  
Author(s):  
P. S. Meadows ◽  
A. Tufail
Keyword(s):  
Spatial Variation ◽  
Microbial Activity ◽  
Large Scale ◽  
Chemical Properties ◽  
Estuarine Sediments ◽  
Sediment Stability ◽  
Estuarine Ecosystem ◽  
Particle Sedimentation ◽  
Geochemical Properties ◽  
Sea Bed

SynopsisMacrobenthic bioturbation and microbial activity can have major ecological effects on present day marine sediments some of which are also seen in the fossil record. The coastal and estuarine sediments in the Clyde Estuary area are described. They contain very high densities of benthic macroorganisms and microorganisms. These organisms have dramatic effects on the physical and chemical properties of sediments, and field and laboratory studies have shown that many geotechnical and geochemical properties of sediments are dictated by them. The effects can be on a microscale of a few millimetres horizontally or vertically (micro-spatial variation), or can have large scale consequences over hundreds of metres (macro-spatial variation).Sediment stability (shear strength and critical erosion velocity), permeability and particle sedimentation are all altered by macro-invertebrate bioturbation or microbial activity, and many chemical properties such as Eh and pH may be influenced in a similar manner.Biological activity may therefore play a major role in modifying sediment geotechnics and early sediment diagenesis. It also has direct relevance to the siting of man-made structures on the sea-bed and to sediment stability and transport in estuaries.In situseeding experiments may lead to biological control and manipulation of these most important field phenomena.

Defect Structure of Ion-Irradiated Amorphous SiO2

1997 ◽  
Vol 30 (5) ◽  
pp. 618-622 ◽  
Author(s):  
Y. Eyal ◽  
R. Evron ◽  
Y. Cohen
Keyword(s):  
Ion Irradiation ◽  
Chemical Properties ◽  
Atomic Displacement ◽  
Amorphous Sio2 ◽  
X Ray Scattering ◽  
Scattering Centers ◽  
Radiation Induced ◽  
Induced Changes ◽  
Physical And Chemical ◽  
And Chemical Properties

Uniformly enhanced small-angle X-ray scattering intensities of amorphous SiO2, measured following irradiation with 320 keV H+ and He+ beams, are shown to be correlated, irrespective of the incident ion, with the O and Si cumulative displacement yields. Damage by both beams originated primarily from nuclear stopping but, under H+-ion irradiation, contributions from ionization processes were significant as well. At low beam fluences, the irradiated structure is compatible with the presence of stable radiation-induced interstitial-like O and Si atoms and complementary O and Si vacancy-like sites. There is no evidence for recovery near room temperature of the modified structure to the pre-irradiated state or for formation of colloidal-size scattering centers, such as gas bubbles or voids. Thus, ion-irradiation-induced changes in physical and chemical properties of silica seem to be due to the effect of the preserved primary atomic displacement damage.

scholarly journals The Effects of Nicosulfuron and Glyphosate on Microbial Activity of Different Soils

2018 ◽  
Vol 36 (0) ◽  
Author(s):  
Lj. ŠANTRIC ◽  
Lj. RADIVOJEVIC ◽  
J. GAJIC-UMILJENDIC ◽  
M. SARIC-KRSMANOVIC ◽  
R. ÐUROVIC-PEJCEV
Keyword(s):  
Microbial Biomass ◽  
Microbial Activity ◽  
Microbial Biomass Carbon ◽  
Chemical Properties ◽  
Biomass Carbon ◽  
Treatment Rate ◽  
Negative Effects ◽  
Test Parameters ◽  
Laboratory Changes ◽  
Physical And Chemical

ABSTRACT: The effects of the nicosulfuron and glyphosate herbicides on microbial activity in two soils with different physical and chemical properties (loam and sand) were investigated. Nicosulfuron was applied at the rates of 0.3, 0.6, 3.0 and 30.0 mg kg-1 soil and glyphosate at 32.6, 65.2, 326.0 and 3260.0 mg kg-1 soil in the laboratory. Changes in dehydrogenase and urease activity, as well as in microbial biomass carbon, were examined. Samples for the analysis were collected at 3, 7, 14, 30 and 45 days after herbicide application. The results showed that the effects of nicosulfuron and glyphosate depended on treatment rate, duration of activity, test parameters and soil types. In general, application of the herbicides significantly increased the activity of dehydrogenase and urease. Nicosulfuron had a stimulating activity on microbial biomass carbon in loam, while both herbicides demonstrated negative effects on the parameter in the sandy soil.

Seedball-induced changes of root growth and physico-chemical properties-a case study with pearl millet

2018 ◽  
Vol 181 (5) ◽  
pp. 768-776 ◽  
Author(s):  
Charles I. Nwankwo ◽  
Sebastian R. G. A. Blaser ◽  
Doris Vetterlein ◽  
Günter Neumann ◽  
Ludger Herrmann
Keyword(s):  
Root Growth ◽  
Pearl Millet ◽  
Chemical Properties ◽  
Physico Chemical ◽  
Induced Changes

Thermally Induced Changes in the Structure, Composition, and Chemical Properties of LiMn2O4 ±xSpinel Prepared by Sol–Gel Method

2006 ◽  
Vol 45 (6A) ◽  
pp. 5132-5137 ◽  
Author(s):  
Marcin Molenda ◽  
Roman Dziembaj ◽  
Wiesław Łasocha ◽  
Czesław Rudowicz ◽  
Leonard M. Proniewicz ◽  
...  
Keyword(s):  
Sol Gel ◽  
Chemical Properties ◽  
Thermally Induced ◽  
Gel Method ◽  
Sol Gel Method ◽  
Induced Changes ◽  
And Chemical Properties

scholarly journals Raman and Fluorescence Spectroscopy of CeO2, Er2O3, Nd2O3, Tm2O3, Yb2O3, La2O3, and Tb4O7

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Jianlan Cui ◽  
Gregory A. Hope
Keyword(s):  
Rare Earth ◽  
Energy Levels ◽  
Fluorescence Emission ◽  
Chemical Properties ◽  
Rare Earth Oxide ◽  
Raman Shift ◽  
Laser Sources ◽  
Induced Changes ◽  
Physical And Chemical ◽  
Good Agreement

To better understand and ascertain the mechanisms of flotation reagent interaction with rare earth (RE) minerals, it is necessary to determine the physical and chemical properties of the constituent components. Seven rare earth oxides (CeO2, Er2O3, Nd2O3, Tm2O3, Yb2O3, La2O3, and Tb4O7) that cover the rare earth elements (REEs) from light to heavy REEs have been investigated using Raman spectroscopy. Multiple laser sources (wavelengths of 325 nm, 442 nm, 514 nm, and 632.8 nm) for the Raman shift ranges from 100 cm−1to 5000 cm−1of these excitations were used for each individual rare earth oxide. Raman shifts and fluorescence emission have been identified. Theoretical energy levels for Er, Nd, and Yb were used for the interpretation of fluorescence emission. The experimental results showed good agreement with the theoretical calculation for Er2O3and Nd2O3. Additional fluorescence emission was observed with Yb2O3that did not fit the reported energy level diagram. Tb4O7was observed undergoing laser induced changes during examination.

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