Geodynamic and physico-chemical conditions of formation of the Stepninsky monzogabbro-granosyenite-granite complex (Southern Urals)

Geological structure and physic-chemical characteristics of the Stepninsky, Vandyshevsky, Biryukovsky and Uisky massives related to the Stepninsky monzogabbro-granosyenite-granite complex are described. A conclusion was made that the depth of crystallization of the granitoid massives changes in this row from hypabbyssal to hypabyssal-subsurface facies. It is shown that the intrusions of the complex belong to the intraplate type. At the early stage, the basicintermediate rocks of a deep-mantle genesis were formed, which can be regarded as a derivative of an individual plume; at the later stage they were changed by granites and leucogranites of the calc-alkaline type, formed as a result of anatexis of the lower crust. The rocks of the later stage have a rare-metal geochemical specialization.

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Physico-chemical conditions of crystallization and ore-bearing of granitoids of the border zone of the Southern and Middle Urals

Геохимия ◽

10.31857/s0016-752564111133-1145 ◽

2019 ◽

Vol 64 (11) ◽

pp. 1133-1145

Author(s):

A. V. Snachev ◽

V. I. Snachev ◽

S. E. Znamenskyа

Keyword(s):

Melt Inclusions ◽

Water Pressure ◽

Rare Metal ◽

Geological Structure ◽

Border Zone ◽

Middle Urals ◽

Physico Chemical ◽

Rare Metal Mineralization ◽

Chemical Conditions ◽

Age Range

The geological structure of the border zone of the Southern and Middle Urals (Kunashak area), as well as the composition and conditions for the formation of granitoid complexes developed here, whose age varies from Devonian to Triassic, is briefly considered. Thermobarometric studies of quartz of medium-grained biotite granites showed that in the age range ― Poletaev (D3), Shalkar (P1), Sultayev (P1), and Yugokonev (P1T2) complexes ― water pressure during the formation of melt inclusions was 2.22.7, 2.53.0, 3.94.4 and 3.64.5 kbar, and the crystallization temperature of rocks ― 800840, 900940, 840900 and 940980С. This indicates a consistent increase in the crystallization depth of the granite massifs in this series from the hypabyssal-subsurface to the hypabyssal-abyssal facies. At the same time, in the melt-fluid inclusions, a decrease in fluid volume is noted ― 14.216.8, 8.114.3, 6.27.9 and 4.36.8 vol.%, Water concentrations ― 3.74.8, 2.13.9, 1.82.3 and 1.31.9 wt.% as well as chlorine ― 0.040.08, 0.030.07, 0.030.06 and 0.020.05 wt.%. It is shown that the granitoids of the Sultayev and Yugokonev complexes are very promising for tantalum, niobium, tungsten, molybdenum and beryllium. Of the greatest interest in rare-metal mineralization are the leucocratic aplitic and greisen granites of the final phases of the formation of intrusions. The level of erosional slice of various structural and formation zones of the Kunashak area relative to each other has been established.

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Probiotics in colorectal cancer (CRC) with emphasis on mechanisms of action and current perspectives

Journal of Medical Microbiology ◽

10.1099/jmm.0.048975-0 ◽

2013 ◽

Vol 62 (8) ◽

pp. 1107-1123 ◽

Cited By ~ 58

Author(s):

Imen Kahouli ◽

Catherine Tomaro-Duchesneau ◽

Satya Prakash

Keyword(s):

Colorectal Cancer ◽

Early Stage ◽

Tumour Progression ◽

Great Promise ◽

Anticancer Compounds ◽

Beneficial Effects ◽

Physico Chemical ◽

Recent Developments ◽

Chemical Conditions

Colorectal cancer (CRC) is the third most common form of cancer. Diverse therapies such as chemotherapy, immunotherapy and radiation have shown beneficial effects, but are limited because of their safety and toxicity. Probiotic formulations have shown great promise in CRC as preventive and early stage therapeutics. This review highlights the importance of a balanced intestinal microbiota and summarizes the recent developments in probiotics for treating CRC. Specifically, this report describes evidence of the role of probiotics in modulating the microbiota, in improving the physico-chemical conditions of the gut and in reducing oxidative stress. It also discusses the mechanisms of probiotics in inhibiting tumour progression, in producing anticancer compounds and in modulating the host immune response. Even though some of these effects were observed in several clinical trials, when probiotic formulations were used as a supplement to CRC therapies, the application of probiotics as biotherapeutics against CRC still needs further investigation.

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Physico-Chemical Influence of Surface Water Contaminated by Acid Mine Drainage on the Populations of Diatoms in Dams (Iberian Pyrite Belt, SW Spain)

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph16224516 ◽

2019 ◽

Vol 16 (22) ◽

pp. 4516 ◽

Cited By ~ 2

Author(s):

Maria José Rivera ◽

Ana Teresa Luís ◽

José Antonio Grande ◽

Aguasanta Miguel Sarmiento ◽

José Miguel Dávila ◽

...

Keyword(s):

Surface Water ◽

Acid Mine Drainage ◽

Mine Drainage ◽

Iberian Pyrite Belt ◽

Early Spring ◽

Chemical Characteristics ◽

Acid Mine ◽

Physico Chemical ◽

Diatom Communities ◽

Chemical Conditions

Twenty-three water dams located in the Iberian Pyrite Belt were studied during March 2012 (early spring) in order to carry out an environmental assessment based on diatom communities and to define the relationships between these biological communities and the physico-chemical characteristics of the dam surface water. This is the first time that a diatom inventory has been done for dams affected by acid mine drainage (AMD) in the Spanish part of the Iberian Pyrite Belt (IPB). It was found that the pH was the main factor influencing the behaviour of the diatom communities. Then, using a dbRDA approach it was possible to organize the aggrupation of diatoms into four groups in response to the physico-chemical conditions of the ecosystem, especially pH: (1) Maris, Aac, Gos, Cmora (pH 2–3); (2) Andc, San, And, Dpin (pH 3–4.5); (3) Gran, Pleon, Oliv, Lagu, Chan, SilI, SilII, Joya, Gar, Agrio, Camp, Corum (pH 4.5–6); (4) Herr, Diq I, Diq II (pH 6–7). The obtained results confirmed the response of benthic diatom communities to changes in the physico-chemical characteristics of surface water, and helped to understand the role of diatoms as indicators of the degree of AMD contamination in those 23 dams. Special attention was given to those that have an acidophilic or acid-tolerant profile (pH 2–3 and pH 3–4.5) such as Pinnularia aljustrelica, Pinnularia acidophila, Pinnularia acoricola and Eunotia exigua, which are the two groups found in the most AMD contaminated dams.

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Effects of root pruning on physico-chemical characteristics and biological properties of winter jujube rhizosphere soil

Plant Soil and Environment ◽

10.17221/38/2011-pse ◽

2011 ◽

Vol 57 (No. 11) ◽

pp. 493-498 ◽

Cited By ~ 6

Author(s):

S.J. Yang ◽

Z.Y. Du ◽

Y. Yu ◽

Z.L. Zhang ◽

X.Y. Sun ◽

...

Keyword(s):

Rhizosphere Soil ◽

Early Stage ◽

Biological Properties ◽

Chemical Characteristics ◽

Root Pruning ◽

Available Nitrogen ◽

Pesticides Residues ◽

Trunk Diameter ◽

Physico Chemical ◽

Zizyphus Jujuba

The root system of six-year-old winter jujube (Zizyphus jujuba Mill. cv. Zhanhua) trees were manually pruned at 3, 5 or 7 times trunk diameter distance along both inter-row sides, to study the effects of root pruning on physico-chemical characteristics and biological properties of winter jujube rhizosphere soil. The results showed that the root pruning of 3 and 5 times trunk diameter distance increased the available nitrogen, phosphorus, potassium[concentrations and pH values in the rhizosphere soil and decreased organic matter concentrations, the contents of amino acids, organic acids and total sugars in the root exudates, the populations of bacteria, actinomyces and fungi, and inhibited the activities of catalase, invertase and urease enzymes in contrast to the control in early stage when root pruning was applied. The determined indexes presented a reverse trend as those in early stage after new roots appeared. Compared to the control, the trees by root pruning had higher pesticides residues of the rhizosphere soil in the whole experiment. No differences were noticed between 7 times trunk diameter distance and the control. It is proposed that root pruning had greater impacts on physico-chemical characteristics and biological properties of the rhizosphere soil depending on root pruning intensity.

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Changes in the taxonomic and functional structure of microbial communities during vegetable waste mixed silage fermentation

Canadian Journal of Microbiology ◽

10.1139/cjm-2021-0059 ◽

2022 ◽

Author(s):

Quanju Xiang ◽

Juntao Zhang ◽

Xiying Huang ◽

Menggen Ma ◽

Ke Zhao ◽

...

Keyword(s):

Lactic Acid ◽

Bacterial Communities ◽

Early Stage ◽

Bacterial Community Composition ◽

Ammonia Nitrogen ◽

Raw Material ◽

Chemical Characteristics ◽

Vegetable Waste ◽

Silage Fermentation ◽

Physico Chemical

Silage fermentation, a sustainable way to use vegetable waste resources, is a complex process driven by a variety of microorganisms. We used lettuce waste as the main raw material for silage, analyzed changes in the physico-chemical characteristics and bacterial community composition of silage over a 60-day fermentation, identified differentially abundant taxa, predicted the functional profiles of bacterial communities, and determined the associated effects on the quality of silage. The biggest changes occurred in the early stage of silage fermentation. Changes in the physico-chemical characteristics included a decrease in pH and increases in ammonia nitrogen to total nitrogen ratio and lactic acid content. The numbers of lactic acid bacteria (LAB) increased and molds, yeasts and aerobic bacteria decreased. The bacterial communities and their predicted functions on day 0 were clearly different from those on day 7 to day 60. The relative abundances of phylum Firmicutes and genus Lactobacillus increased. Nitrite ammonification and nitrate ammonification were more prevalent after day 0. The differences in the predicted functions were associated with differences in pH and amino acid, protein, carbohydrate, NH3-N, ether extract and crude ash contents.

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