Radionuclides and toxic chemical elements in the transboundary Kyrgyzstan–Kazakhstan rivers

2016 ◽  
Vol 309 (1) ◽  
pp. 115-124
Author(s):  
V. P. Solodukhin ◽  
V. L. Poznyak ◽  
G. M. Kabirova ◽  
L. A. Ryazanova ◽  
S. G. Lennik ◽  
...  
Keyword(s):  
Chemical Elements ◽  
Toxic Chemical

POTENTIALLY TOXIC CHEMICAL ELEMENTS OF SHALE PLAYS – ECOLOGICAL THREAT TO THE ENVIRONMENT

2020 ◽  
Author(s):  
Svetlana Punanova
Keyword(s):  
Chemical Elements ◽  
Organometallic Compounds ◽  
Cost Effective ◽  
Potentially Toxic Elements ◽  
Shale Oil ◽  
Toxic Chemical ◽  
Horizontal Drilling ◽  
Soil Layers ◽  
Valuable Metals ◽  
Economic Use

This research considered the content of trace elements (TE), including potentially toxic elements (PTE) in shale plays and deposits in various regions of the world. Their comparative analysis was carried out and the highest concentrations of PTE in the shales of some regions were revealed. The author notes that the destruction of organometallic compounds occurs during the development of shale hydrocarbon (HC) using horizontal drilling with hydraulic fracturing – injecting large volumes of chemicals while increasing the temperature. During such destruction processes, PTE can escape into the environment: into groundwater, soil layers, and other objects of economic use, and also deteriorate well equipment. In connection with the noted environmental hazards present during the development of shale HC, this paper proposes to monitor the content of TE in both shale rocks as well as in extracted shale oil in order to mitigate the risks of their release into the environment. In addition, developers and scientists should consider the losses of industrially significant volumes of valuable metals that occur due to the lack of cost-effective technologies for their capture and extraction from naphthides.

scholarly journals Development of Rural Ecotourism on the Yurshinsky Island of Rybinsk Reservoir

2020 ◽  
Vol 217 ◽  
pp. 05002
Author(s):  
Svetlana Zamana ◽  
Olga Sorokina ◽  
Dmitriy Shapovalov ◽  
Alexandr Fomin ◽  
Larisa Petrova ◽  
...  
Keyword(s):  
Chemical Analysis ◽  
Protected Area ◽  
Rybinsk Reservoir ◽  
Chemical Elements ◽  
Soil Samples ◽  
Tourist Industry ◽  
Toxic Chemical ◽  
Young Branch ◽  
The Given ◽  
The Rybinsk Reservoir

Agroecotourism is a relatively young branch of tourist industry in our country, at the same time it has become very popular abroad. The article considers some problems related to the development of rural ecotourism on the Yurshinsky island of Rybinsk reservoir. Various landscapes can be seen on the Yurshinsky island, escaping flowage of the Rybinsk reservoir area, where unique samples of Russian nature have remained untouched. The territory of island makes 792 hectares, half of its land is occupied by woods, and now all island has a status of specially protected area. Moose breeding farm is recommended to be established as the object of rural ecotourism on the Yurshinsky island, as its operation allows the tourist season last all-year-round. Ecological conditions of the territory need to be assessed before the organization of a moose farm and other objects of agroecotourism. Therefore we selected several soil samples to perform chemical analysis as the soil represents the knot of interrelations in biosphere and a lack or surplus of both vital, and toxic chemical elements in the soil will lead to their lack or surplus in plants grown up on such soils and in animal organisms which eat the given plants.

Essential and Potentially Toxic Chemical Elements in Beverages

2007 ◽  
pp. 455-501
Author(s):  
Patricia Smichowski ◽  
Daniel A. Batistoni
Keyword(s):  
Chemical Elements ◽  
Toxic Chemical

INFLUENCE OF TEHNOGENIC CONTAMINATION ON INDEXES OF THE STATE OF FREE-RADICAL OXIDIZATION AND MICRONUTRIENTN STATUS FOR WORKERS OF THE FILLINGS STATIONS, RESIDENTS OF KHMAO – YUGRA

2017 ◽  
pp. 39-42
Author(s):  
V.I. Korchin ◽  
Yu.S. Makaeva ◽  
T.Ya. Korchina ◽  
E.A. Shagina
Keyword(s):  
Heavy Metals ◽  
Antioxidant Activity ◽  
Trace Elements ◽  
Free Radical ◽  
Chemical Elements ◽  
The State ◽  
Toxic Chemical ◽  
Antioxidant Defence ◽  
Low Concentration ◽  
Cadmium Lead

Тhe analysis of metabolic violations and microelement disbalance is presented for the workers of the fillings stations on territory of KHMAO – Yugra. The expressed changes are set in the processes of oxidizing stress and antioxidant defence. In the hairs was registered the meaningful exceeding of concentration of toxic chemical elements (cadmium, lead) and iron possessing pro-oxidant properties on a background reliable to low concentration of the universal antagonist of heavy metals – by a calcium and trace elements possessing antioxidant activity (selenium, zinc) – in the organism.

scholarly journals Selected Essential and Toxic Chemical Elements in Hypothyroidism—A Literature Review (2001–2021)

2021 ◽  
Vol 22 (18) ◽  
pp. 10147
Author(s):  
Anna Błażewicz ◽  
Patrycja Wiśniewska ◽  
Katarzyna Skórzyńska-Dziduszko
Keyword(s):  
Toxic Elements ◽  
Web Of Science ◽  
Chemical Elements ◽  
Physiological State ◽  
Potentially Toxic Elements ◽  
The Body ◽  
Toxic Chemical ◽  
Thyroid Status ◽  
Hormone Synthesis ◽  
Essential Chemical

Thyroid hormones are known for controlling metabolism of lipids, carbohydrates, proteins, minerals, and electrolytes and for regulating body temperature. Normal thyroid status depends on the chemical/elemental composition of body fluids and tissues, which changes depending on physiological state, lifestyle and environment. A deficiency or excess of certain essential chemical elements (selenium, zinc, copper, iron or fluorine) or exposure to toxic (cadmium or lead) or potentially toxic elements (manganese or chromium) interacts with thyroid hormone synthesis and may disturb thyroid homeostasis. In our review, accessible databases (Scopus, PubMed and Web of Science) were searched for articles from 2001–2021 on the influence of selected chemical elements on the development of hypothyroidism. Our review adopted some of the strengths of a systematic review. After non-eligible reports were rejected, 29 remaining articles were reviewed. The review found that disruption of the physiological levels of elements in the body adversely affects the functioning of cells and tissues, which can lead to the development of disease.

scholarly journals Hormone-microelement homeostasis of boys with obesity and delayed sexual development

2020 ◽  
pp. 46-50
Author(s):  
V. A. Popova ◽  
A. A. Kozhin ◽  
N. A. Drukker ◽  
S. N. Selyutina ◽  
O. Z. Puzikova
Keyword(s):  
Sexual Development ◽  
Chemical Elements ◽  
Lead Content ◽  
Toxic Chemical ◽  
Adolescent Boys ◽  
Urine Concentrations ◽  
High Lead

The results of examinations of adolescent boys with varying degrees of obesity and delayed sexual development (DSD) showed that the content of hormones (kisspeptin, leptin, testosterone, gonadotropins, etc.) correlated with the level of essential and toxic chemical elements in urine. Correlations between urine concentrations of zinc, selenium and levels of leptin, kisspeptin and testosterone were found. This points to the etiological determinant of microelementosis in the formation of DSD in obesity in boys — possibly the effect of high lead content in urine.

Nuclear Processes Related to the Ap Stars and the Heaviest Chemical Elements

1976 ◽  
Vol 32 ◽  
pp. 169-182
Author(s):  
B. Kuchowicz
Keyword(s):  
Nuclear Physics ◽  
Nuclear Reactions ◽  
Chemical Elements ◽  
Fission Products ◽  
Abundance Pattern ◽  
Isotopic Shifts ◽  
Processed Material ◽  
R Process ◽  
Ap Stars ◽  
Nuclear Processes

SummaryIsotopic shifts in the lines of the heavy elements in Ap stars, and the characteristic abundance pattern of these elements point to the fact that we are observing mainly the products of rapid neutron capture. The peculiar A stars may be treated as the show windows for the products of a recent r-process in their neighbourhood. This process can be located either in Supernovae exploding in a binary system in which the present Ap stars were secondaries, or in Supernovae exploding in young clusters. Secondary processes, e.g. spontaneous fission or nuclear reactions with highly abundant fission products, may occur further with the r-processed material in the surface of the Ap stars. The role of these stars to the theory of nucleosynthesis and to nuclear physics is emphasized.

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