bluuebunny/crossref_metadata_2025 huggingface dataset:
Two-dimensionality of metallic surface conduction in Co3Sn2S2 thin films
Authors: Ikeda Junya , Fujiwara Kohei , Shiogai Junichi , Seki Takeshi , Nomura Kentaro , Takanashi Koki , Tsukazaki Atsushi
Published: June 2021

Two-dimensional (2D) surface of the topological materials is an attractive channel for the electrical conduction reflecting the linearly-dispersive electronic bands. Thickness-dependent sheet conductance measurement is a reliable method to evaluate the 2D and three-dimensional (3D) electrical conducting channel separately but has rarely been applied for Weyl semimetals. By applying this method to thin films of a Weyl semimetal Co3Sn2S2, here we show that the 2D conducting channel clearly emerges under the ferromagnetic phase, indicating a formation of the Fermi arcs projected from Weyl nodes. Comparison between 3D conductivity and 2D conductance provides the effective thickness of the surface conducting region being estimated to be approximately 20 nm, which would reflect the Weyl feature of electronic bands of the Co3Sn2S2. The emergent surface conduction will provide a pathway to activate quantum and spintronic transport features stemming from a Weyl node in thin-film-based devices.
4D printing of reconfigurable metamaterials and devices
Authors: van Manen Teunis , Janbaz Shahram , Jansen Kaspar M. B. , Zadpoor Amir A.
Published: June 2021

Shape-shifting materials are a powerful tool for the fabrication of reconfigurable materials. Upon activation, not only a change in their shape but also a large shift in their material properties can be realized. As compared with the 4D printing of 2D-to-3D shape-shifting materials, the 4D printing of reconfigurable (i.e., 3D-to-3D shape-shifting) materials remains challenging. That is caused by the intrinsically 2D nature of the layer-by-layer manner of fabrication, which limits the possible shape-shifting modes of 4D printed reconfigurable materials. Here, we present a single-step production method for the fabrication and programming of 3D-to-3D shape-changing materials, which requires nothing more than a simple modification of widely available fused deposition modeling (FDM) printers. This simple modification allows the printer to print on curved surfaces. We demonstrate how this modified printer can be combined with various design strategies to achieve high levels of complexity and versatility in the 3D-to-3D shape-shifting behavior of our reconfigurable materials and devices. We showcase the potential of the proposed approach for the fabrication of deployable medical devices including deployable bifurcation stents that are otherwise extremely challenging to create.
PFM (piezoresponse force microscopy)-aided design for molecular ferroelectrics
Authors: Zhang Han-Yue , Chen Xiao-Gang , Tang Yuan-Yuan , Liao Wei-Qiang , Di Fang-Fang , Mu Xin , Peng Hang , Xiong Ren-Gen
Published: June 2021

Along with the rapid development of ferroelectrochemistry, piezoresponse force microscopy (PFM) with high detection speed and accuracy has become a powerful tool for screening the potential candidates for molecular ferroelectrics.
Dietary niacin affects intestinal morphology and functions via modulating cell proliferation in weaned piglets
Authors: Yi Zhenfeng , Tan Xian , Wang Qiye , Huang Pengfei , Li Yali , Ding Xueqin , Li Jianzhong , Huang Jing , Yang Huansheng , Yin Yulong
Published: June 2021

This study has identified that a relatively high level of dietary niacin has improved intestinal health by regulating the proliferation of intestinal cells. These results provide novel information on alleviating weaning stress research.
Catalytic decomposition of methane into hydrogen and high-value carbons: combined experimental and DFT computational study
Authors: Wang I.-Wen , Dagle Robert A. , Khan Tuhin Suvra , Lopez-Ruiz Juan A. , Kovarik Libor , Jiang Yuan , Xu Mengze , Wang Yi , Jiang Changle , Davidson Stephen D. , Tavadze Pedram , Li Lili , Hu Jianli
Published: June 2021

Thermocatalytic decomposition (TCD) of methane can produce hydrogen and valuable nanocarbon co-products with low to near-zero CO2 emission.
Doubly fused N,N,N-iron ethylene polymerization catalysts appended with fluoride substituents; probing catalytic performance via a combined experimental and MLR study
Authors: Zhang Qiuyue , Yang Wenhong , Wang Zheng , Solan Gregory A. , Liang Tongling , Sun Wen-Hua
Published: June 2021

In agreement with the MLR analysis, the fluorinated iron precatalyst, R1 = F, R2 = R3 = CH(p-FPh)2, proved the most active at 70 °C generating strictly linear polyethylene waxes.
A single luminescence center ultra-broadband near-infrared LiScGeO4:Cr phosphor for biological tissue penetration
Authors: Ye Zejun , Wang Zhijun , Wu Qian , Huo Xiaoxue , Yang Huifang , Wang Yu , Wang Dawei , Zhao Jinxin , Suo Hao , Li Panlai
Published: June 2021

An ultra-broadband emission phosphor was synthesized. Its FWHM reaches 335 nm, and its emission spectrum ranges from 800 nm to 1650 nm, which almost covers the entire near-infrared second window.
A simple strategy for the visual detection and discrimination of Hg2+ and CH3Hg+ species using fluorescent nanoaggregates
Authors: Dey Nilanjan
Published: June 2021

Fluorescent nanoaggregates based on a phenanthroline-based amphiphilic probe have been utilized for detection as well as differentiation of Hg2+ (LOD ∼4 ppb) and CH3Hg+ (LOD ∼18 ppb) in the aqueous medium.
Two mixed valence diruthenium(ii,iii) isomeric complexes show different anticancer properties
Authors: Barresi Elisabetta , Tolbatov Iogann , Marzo Tiziano , Zappelli Elisa , Marrone Alessandro , Re Nazzareno , Pratesi Alessandro , Martini Claudia , Taliani Sabrina , Da Settimo Federico , La Mendola Diego
Published: June 2021

Two isomeric Ru2(ii,iii) mixed valence compounds show profoundly different anticancer properties due to their activation profiles and their ligands’ chemical features.
Salmon food matrix influences digestion and bioavailability of long-chain omega-3 polyunsaturated fatty acids
Authors: Ahmed Nasef Noha , Zhu Peter , Golding Matt , Dave Anant , Ali Ajmol , Singh Harjinder , Garg Manohar
Published: June 2021

The natural structure of fish (salmon) plays an important role in digestion and absorption of bioactive compounds (fish oil) present within the fish, also known as the “matrix effect”.
Uniform MnCo2O4.5 porous nanowires and quasi-cubes for hybrid supercapacitors with excellent electrochemical performances
Authors: Du Xuming , Sun Jiale , Wu Runze , Bao Enhui , Xu Chunju , Chen Huiyu
Published: June 2021

A simple hydrothermal route with a post annealing treatment was used to prepare MnCo2O4.5 porous nanowires and quasi-cubes with excellent electrochemical performances.
Modification of thermal transport in few-layer MoS2 by atomic-level defect engineering
Authors: Zhao Yunshan , Zheng Minrui , Wu Jing , Guan Xin , Suwardi Ady , Li Yida , Lal Manohar , Xie Guofeng , Zhang Gang , Zhang Lifa , Thong John T. L.
Published: June 2021

MoS2 has attracted significant attention due to good charge carrier mobility, high on/off ratio in field-effect transistor and layer-dependent properties, with potential applications in nano electronic, photovoltaic and phononic devices.
Interactions between water and rhodium clusters: molecular adsorption versus cluster adsorption
Authors: Jia Yuhan , Wu Haiming , Zhao Xiaoyun , Zhang Hanyu , Geng Lijun , Zhang Hongchao , Li Si-Dian , Luo Zhixun , Hansen Klavs
Published: June 2021

We observe the gas-phase reactions of rhodium clusters with water and unveil the different interactions pertaining to molecular adsorption versus cluster adsorption.
Recent progress on electrochemical synthesis involving carboxylic acids
Authors: Chen Na , Ye Zenghui , Zhang Fengzhi
Published: June 2021

Recent progress on sustainable electrochemical synthesis involving carboxylic acids was reviewed.
The inverting mechanism of the metal ion-independent LanGT2: the first step to understand the glycosylation of natural product antibiotic precursors through QM/MM simulations
Authors: Mendoza Fernanda , Jaña Gonzalo A.
Published: June 2021

Glycosyltransferases (GTs) from the GT1 family are responsible for the glycosylation of various important organic structures such as terpenes, steroids and peptide antibiotics, making it one of the most intensely studied families of GTs.
A long-term controlled release of the drug for osteoporosis from the surface of titanium implants coated with calcium zeolite
Authors: Sandomierski Mariusz , Zielińska Monika , Voelkel Adam
Published: June 2021

The aim of this study was to prepare an implant material enabling a slow, gradual and gentle release of risedronate.
Re(i)-nitroxide complexes
Authors: Maryunina Kseniya , Letyagin Gleb , Bogomyakov Artem , Morozov Vitaly , Tumanov Sergey , Veber Sergey , Fedin Matvey , Saverina Evgeniya , Syroeshkin Mikhail , Egorov Mikhail , Romanenko Galina , Ovcharenko Victor
Published: June 2021

Stable nitroxide-substituted cyrhetrenes were synthesized and characterized by EPR, CV, XRD, magnetochemistry and quantum chemistry methods.
Can unmixed complex forming polymer surfactant formulations be injected into oil reservoirs or aquifers without clogging them?
Authors: Hamouma Massinissa , Delbos Aline , Dalmazzone Christine , Colin Annie
Published: June 2021

In the context of enhanced oil recovery or soil remediation, we study the role of interactions between polymers and surfactants on the injectivity of formulations containing mixtures of polymers and surfactants.
Correction: In situ interferometry study of ionic mass transfer phenomenon during the electrodeposition and dissolution of Li metal in solvate ionic liquids
Authors: Miki Akinori , Nishikawa Kei , Kamesui Go , Matsushima Hisayoshi , Ueda Mikito , Rosso Michel
Published: June 2021

Correction for ‘In situ interferometry study of ionic mass transfer phenomenon during the electrodeposition and dissolution of Li metal in solvate ionic liquids’ by Akinori Miki et al., J. Mater. Chem. A, 2021, DOI: 10.1039/d1ta02666f.
A dual‐rate burst‐mode receiver with rapid response and high CID tolerance for XGS PON
Authors: Kawanaka Takanori , Yoshima Satoshi , Noda Masaki
Published: June 2021

A burst‐mode receiver chip‐set including a preamplifier and limiting amplifier which can recover both 9.95 Gb/s and 2.49 Gbit/s packets within a short 64.3 ns preamble time is described in this paper. This receiver is also able to settle while receiving a packet that includes over 72 bits of CID. To realise these characteristics, we placed a rapid peak‐detecting AGC in the preamplifier IC and a rapid discharge block between the ICs. Our receiver achieved high sensitivities of –31.2 dBm for 9.95 Gb/s and –36.5 dBm for 2.49 Gb/s within a 64.3 ns preamble and with a payload packet that includes 72 bits of CID. In addition, this receiver meets the ITU‐T G.9807.1 E1 and G.987.2 E1 Recommendations even if a packet includes such long stretches of constant signal level as 768 bits of CID in the case of 9.95 Gb/s and 256 bits of CID in the case of 2.49 Gb/s.
Numerical approximation of the averaged controllability for the wave equation with unknown velocity of propagation
Authors: Abdelli Mouna , Castro Carlos
Published: June 2021

We propose a numerical method to approximate the exact averaged boundary control of a family of wave equations depending on an unknown parameter σ. More precisely the control, independent of σ, that drives an initial data to a family of final states at time t = T, whose average in σ is given. The idea is to project the control problem in the finite dimensional space generated by the first N eigenfunctions of the Laplace operator. When applied to a single (nonparametric) wave equation, the resulting discrete control problem turns out to be equivalent to the Galerkin approximation proposed by F. Bourquin et al. [C.R. Acad. Sci. Paris 313 I (1991) 757–760]. We give a convergence result of the discrete controls to the continuous one. The method is illustrated with several examples in 1-d and 2-d in a square domain and allows us to give some conjectures on the averaged controllability for the continuous problem.
New data about Chiropterofauna of the “Monte Pellegrino” Nature Reserve (Palermo, Italy)
Authors: Lo Nigro Marta , Rallo Angelica , Provinzano Giovanni , Vanisova Elena , Lo Valvo Mario
Published: June 2021

This work increase the knowledge related to bat fauna present in the “Monte Pellegrino” Nature Reserve in the Palermo municipality. The acoustic sampling took place in the summer/autumn season using the D500X Bat detector in 22 samples. The identified signals were attributed to 8 species and one genus. The Taxa with the most passes in the reserve are: Tadarita teniotis followed by Pipistrellus kuhlii, Hypsugo savii (100% of Costancy), Pipistrellus pygmaeus, Pipistrellus pipistrellus, Plecotus sp., Miniopterus schreibersii and last with a single recording Rhinolophus ferrumequinum and Rhinolophus hipposideros. The dendrogram of similarity shows 3 distinct bats cenosis. Two samples present intense activity in almost all time slots and three samples, close to each, show a peak increase in the intermediate time slots for the three most abundant species. The analysis carried out on the environmental preferences shows that among the 13 Corine Land Cover (CLC) habitats, the highest number of passes is recorded in Artificial lakes (code 5122), Orchards (code 222) and Arid limestone grassland (code 3211). The Arid limestone grassland habitat (code 3211) has the highest Shannon Index value, while the Mastic stain habitat (code 32312) has the lowest diversity value. The dendrogram of similarity shows two clusters. In the first there are Gorse (code 32231), Mediterranean scrub (code 31111), Orchards (code 222), Mosaic of agricultural plots (code 242), while the second cluster contains the remaining habitats.
Ecological role of homeless dogs in anthropogenic territories
Authors: Rakhimov I.I. , Shamsuvaleeva E.Sh. , Arinina A.V.
Published: June 2021

The article presents materials of long-term observations for homeless dogs in the territory of the Republic of Tatarstan. Dogs that have passed the path of their domestication are currently showing the opposite process - feralization. According to unofficial data, there are tens of thousands of stray animals in Kazan alone. As the dominant land-based predators, and not only in cities, but also in the suburbs of settlements, they pose a threat to biodiversity in various ecosystems. Stray dogs are indicated as a limiting factor for the large jerboa and speckled ground squirrel included in the Red Book of the Republic of Tatarstan.
Natural and anthropogenic factors influence on the botanic natural sanctuary vegetation cover dynamics of the river Volga delta
Authors: Valov M V , Barmin A N
Published: June 2021

The river Volga state assessment and landscape functioning is an extremely necessary part for stable and ecologically safe region development. One of the most important this assessment components is vegetation monitoring organization and conduction, which is the necessary part of modern ecosystem exploitation. Monitoring investigations brief results of the botanic natural monuments vegetation cover situated in the eastern part of the river Volga delta are shown in this work. Environment major factors change impact defining main ecological properties if deltoid landscape vegetation cover: some climatic characteristics, the river Volga hydrological regime changes and flooding conditions, vegetation cover differentiation peculiarities in dependence on deltoid land forms and confined processes to it are considered for the monitoring period. It was revealed during the monitoring that abrupt water-soluble salts amount increase in soils occurred, also toxicity level and soil salinization type from chloride- sulfate to sulfate-chloride, that affects vegetation cover: total biomass decrease, projective cover degree decrease on the all deltoid landscape high level, sedges and gramineous plant involvement degree decrease and herbs increase in vegetation cover due to ariditization degree and desert advancing caused either by natural or anthropogenic impact.
Age structure of coniferous saplings in mountain old-growth forests of the Middle Urals
Authors: Ivanova Natalya , Petrova Irina
Published: June 2021

The processes of natural reforestation play a crucial role for the preservation of primary coniferous forests and the success of their restoration after catastrophic impacts. The objective of our research was to identify the features of the natural renewal of the main coniferous forest-forming plants under the canopy of stands in the mountains of the Middle Urals, to establish dependencies on the forest type not only the total number of tree saplings, but also its age structure. The research was carried out in the mountainous part of the Sverdlovsk region (Russia) on the eastern macroslope of the Ural Mountains. We studied old-age pine forests, which belong to the 4 most common forest types. The tree saplings were counted into account on 2-4 subplots with a length of 20 meters and a width of 2 meters. It is established that under the canopy of all types of forest there is a different age coniferous saplings, despite significant differences in habitats. The most abundant pine saplings are found in pine forests withVaccinium vitis-idaea, and the most abundant spruce saplings is found in pine forest with spruce and moss cover.
On the elemental composition estimation of some herbal species of calcareous steppes and its bioindication prospects
Authors: Prokhorova Nataly , Sarvarova Rezida , Makarova Yuly , Bugrov Sergey , Kuzovenko Oxana
Published: June 2021

On the territory of our country, in foreign Europe, in North America, in some regions there are outcrops calcareous rocks. The high endemism and the same of rare plant species concentration are characteristic features of such landscapes. The results of elemental composition primary assessment of aboveground and underground organs of three plant species from calcareous biotopes of Samara region are given. Three species were chosen for studies: obligate calcephite Gypsophila jusepczukii Ikonn., calcephilic Hedysarum grandiflorum Pall. (both included in the Red Book of Samara Region), Reseda lutea L., a ruderal species. For the quantitative analysis of the content of metals in the stems, leaves, flowers, and roots of these plants, the method of spectrometry with inductively coupled plasma was used. It was shown that the effective barrier function of roots in relation to most of the analyzed elements is characteristic of calcephilous (Hedysarum) and calcephytic (Gypsophila) plant species, but not for Reseda lutea. To a certain extent, the stem tissues play a barrier biogeochemical role in Reseda. A general biogeochemical feature of these species, especially pronounced for Reseda, is expressed in increased Se accumulation in aboveground organs.
Range of main species of phytophages and entomophages of cotton agrobiocenosis in lower reaches of the Zarafshan river
Authors: Fayzullaev B. , Mirzamurodov O.
Published: June 2021

Numerous arthropods have adapted to live in various biocenosis in the process of evolutionary transformation, especially under the influence of anthropogenic pressure, in particular cotton, which is widely distributed in Uzbekistan, especially in the lower reaches of the Zarafshan river. Among them there is a large group of phytophages, which causes substantial harm to cotton. It is also home to predatory and parasitic insects, entomophages, which are their effective regulators. The long-term impact of the anthropic factor on the complex of phytophages and entomophages in cotton agrobiocenosis could not but affect their vital activity. Meanwhile, previous studies did not fully open the nature of interaction of individual groups of arthropod animals and did not take into account the changes that occurred in the transformed natural environment. The aim of the research is to study the species composition of arthropods, to determine the main species of phytophages and entomophages, their ecology and biological principles for regulating their numbers in cotton agrobiocenosis.
Dynamics of electric and magnetic fields in case of the urban environment
Authors: Sturman Vladimir I. , Loginovskaya Alyona N. , Dolganova Anastasiya A. , Shirokov Mihail V.
Published: June 2021

This paper studies the temporal dynamics of power-line frequency electric and magnetic fields in Saint-Petersburg and environs. It is found that electromagnetic fields generated by high-voltage transmission lines (HVTL) constantly change, depending on their loading and weather conditions. The dependence on weather conditions involves both the direct effect of air electrical conductivity as a function of its humidity, and indirect effects including the dependence of energy consumption on temperature and also the correlations between meteorological characteristics. An attempt has been made to evaluate the role of influencing factors.
Hydrological surveys of the Lake Peschanoe and the Sernovodsky isthmus of Kunashir island (Greater Kuril сhain)
Authors: Grishchenko Mikhail Y. , Krylenko Vasiliy I. , Ozhgikhina Viktoria T. , Gorbarenko Artyom V.
Published: June 2021

The article is devoted to the study of the largest lake of the island of Kunashir – the lake Peschanoe (means Sandy) – and the adjacent sections of the coast of the Sea of Okhotsk. Despite its considerable size and relatively easy transport accessibility, the lake still remains relatively poorly explored. The topography of its bottom was studied, in particular, the maximum depth of the lake (23 m) was measured; hydrological and hydrobiological surveys of the lake were conducted; the influence of the wind on the intensity of mixing of the lake’s waters was assessed; lagoon origin of the lake was proven; the coastline of the Sea of Okhotsk in the vicinity of the lake was examined. It was revealed that the lake lost connection with the sea long enough so that there are no signs of salt in its water, but not so long enough that it stopped being inhabited by mesohalobiotic crustaceans. The influence of typhoons on the mixing of the lake’s waters is very great that is surprising for such a large lake. This is facilitated by its geographical position on the Sernovodsky isthmus, due to which it is open to both winds blowing from east and west.
The use of chemical and instrumental methods in the study of the forms of occurrence of sulfides in bottom sediments
Authors: Fedorov Yury A. , Garkusha Dmitry N. , Dmitrik Leonid Yu. , Talpa Boris V. , Mikhailenko Anna V.
Published: June 2021

On the example of the estuary of the Mius River - the mouth of the Mius River, the Mius estuary, the Taganrog Bay of the Azov Sea, a complex of chemical and instrumental methods was applied, including those developed by the authors. This made it possible to study the physicochemical parameters, the content of total hydrogen sulphide, the form of occurrence of sulfides, the total content of iron and their behavior in the bottom sediments of early diagenesis. Bottom sediments were formed at negative Eh values. Sulfides in bottom sediments are mainly in the form of molecular hydrogen sulfide and acid-soluble iron sulfides. The content of total hydrogen sulfide varied within wide limits, reaching 3.2 mg/g of wet weight, and of gross iron - from 25.4 to 45.1 mg/g dry weight. A significant relationship was found between the content of sulfide sulfur and gross iron. The presence of hydrotroilite was identified by the typical smell of hydrogen sulfide, black color, oily sludge, lack of magnetic properties and by visual study of its formations using electron microscopy. Under a microscope, images of coacervates (colloidal accumulations) of hydrotroilite of a round-ellipsoidal shape (lenticular), from gray to black, mercury-like, were obtained in a wet preparation. It was established for the first time that hydrotroilite exists in the natural environment as a gel-like substance capable of moving in the bottom of sediments. Upon collision, small formations coalesced into larger globules. The important role of hydrotroilite as a mercury accumulator in the early diagenesis of bottom sediments is shown.
The assessment of soil contamination with heavy metals in the Vladimir city
Authors: Kurochkin Ivan , Chugay Natalia , Kulagina Ekaterina
Published: June 2021

To analyze heavy metal contamination of urbanized soil in the Vladimir city, the soil was sampled and studied. The city area is represented by sod-medium podzolic and gray forest urbanized soil. Soil samples analysis included lead, zinc, copper, nickel, manganese, cobalt and chromium. The resulted parameters were compared to the maximum permissible concentrations and background values. The regularities between the studied sites proximity to the industrial enterprises and heavy metals concentration in soil have been found. The coefficients of heavy metals accumulation in soil have been calculated and the metals as priority pollutants with the highest accumulation coefficient have been identified. By calculating the cumulative accumulation index, the city area has been differentiated according to the hazardous degree. The research peculiarity comprises the sampling locations selection – school sites, as the child population is the most vulnerable to the diseases, associated with the heavy metals accumulation in soil.
The risk assessment, a decision-making tool for the management of contaminated sites
Authors: Bica Ioan , Petruta Anamaria
Published: June 2021

The paper presents a methodology to assess the solutions for the management of contaminated sites. For defining these solutions there were developed two main activities. First one consists in a detailed site investigation to define its geological, hydrogeological characteristics and surely the contamination level. The second activity is dedicated to the assessment of risk generated by the soil, subsoil, air, and groundwater contamination, by using a professional software. The methodology was applied to a real case study. The results showed that for non-carcinogenic compounds the risk is above the thresholds establish by legislation. The conclusion is that measures to mitigate this risk must be taken, based on a feasibility study that will be realised in the next stage of the research.
Biological characteristics and classification of thermophilic actinomycetes showed extracellular hydrolytic enzymes producing ability isolated from compost
Authors: Do Thi Tuyen , Le Van Thang , Ngo Cao Cuong , Do Thi Thu Hong , Dang Thi Hong Phuong
Published: June 2021

Compost is a highly humified organic fertilizer, rich in nutrients and a source of a variety of aerobic microorganisms, including actinomycetes, which develop in response to different levels of temperature, humidity, oxygen and pH. Microbes growing on the compost are believed to have the ability to produce extracellular hydrolytic enzymes. The purpose of this study was to determine the ability of thermophilic actinomycetes XM21 isolated from compost in producing hydrolytic enzymes, namely cellulase, amylase, protease, and lipase. The confirmation tests of hydrolytic enzymes-producing ability were conducted by inoculating the microbes into media containing cellulose, starch, gelatin and tween 80, using the method of disc diffusion. The results showed that strain XM21 capable of extracellular enzymes producing, such as cellulase, protease, amylase, lipase. Strain XM21 can grow well with high cellulase activity in a wide range of temperature between 30-55oC, optimum at 45oC. The strain can grow well on different media, utilized carbon sources with pH 5-10, and salinity of 0-5%. On the agar plate, the strain has white aerial mycelia, the mature spore chains appeared spirals, moderately long, bearing 10 to 35 spores each. Based on the biological characteristics and phylogenetic analysis of 16S rDNA, it can be concluded that strain XM21 is close to Streptomyces flavovariabilis (98, 12%), hence identified as Streptomyces flavovariabilis XM21.
Importance of water objects for the sustainable development of megalopolises
Authors: Suzdaleva Antonina , Hirsch Anna , Mayasova Catherine , Prokopova Anastasia
Published: June 2021

The expansion of megacities leads to the isolation of a large part of their population from the environment. The lack of contact with nature contributes to the development of ecological frustrations and deprivations, unconscious sense of discomfort, which is the cause of the development of a wide range of dangerous diseases, reduction of the birth rate and degradation of the urban population. A solution to this problem can be the organization of a network of recreation places for the urban population (resorts, created on the basis of the preserved elements of the hydrographic network). Positive perception of water objects by human consciousness is one of the main means of ecological relaxation, removal of psychological stress from constant stay in anthropogenic environment. At the same time, resorts should meet the needs of all main social groups. They should include both ecological relaxation zones and places of active recreation . Particular attention is paid to the organization of environmental education activities. Private cases of recreational use of the city’s water bodies are also possible, such as attracting cave explorers to study the underground rivers. In general, resorts based on urban water bodies should become a public space, covering the entire inhabited territory of the metropolis. The system of assessing the social significance of Moscow’s water bodies is developed on the basis of their comprehensive survey. Analysis of their current state takes into account general patterns of historical development of hydrographic networks of the city, and the requirements of the population to the appearance of public spaces created on water bodies of the city and to assess their social significance.
Economic assessment of a complex of measures for the remediation of the territory from technogenic impact
Authors: Provornaya Irina , Filimonova Irina , Yurkevich Nataliya , Nemov Vasiliy , Mishenin Mikhail
Published: June 2021

In this work, an economic assessment of environmental damage to water and land resources is calculated, and the cost of a project for the reclamation of destroyed lands within the territory of the Komsomolsk gold recovery plant is determined. The object of the study is directly the territory of the enterprise, which is located in the Tisulsky municipal district of the Kemerovo region. According to our calculations, the total assessment of environmental damage from the plant’s activities amounted to 458 million rubles, of which: 294 million rubles – accumulated environmental damage from water pollution; 164 million rubles – accumulated environmental damage from soil pollution in the surrounding area. The cost estimate of the destroyed land reclamation project amounted to 716.7 million rubles. At the same time, income from the sale of equipment and gold mined in the territory of the tailing dump reaches 3916 million rubles.
Creating an environmentally safe and reliable heat supply system through the introduction of energy-saving technologies in housing and common utilities services
Authors: Astratova Galina V. , Rutkauskas Tatyana K. , Rutkauskas Konstantin V. , Klimuk Vladimir V.
Published: June 2021

The rational use of natural resources and the creation of an environmentally safety is a priority goal for all mankind. The increasing pollution of the atmospheric air by the combustion products of various types of fuel actualizes the problem of improving the environmental safety and efficiency of heat supply systems (HSS).

Heating is the most energy intensive and wasteful sector of the national economy, because the turnover is comparable to 2.1% of GDP and an average of 50% in payment of citizens for housing and communal utility services (HCUS).

However, HSS today is in a critical state at all stages of production, distribution and consumption of heat, which is especially typical for HCUS enterprises in Russia. Accordingly, the population is not satisfied with the quality and price of HCUS services. The purpose of the study was to develop a mechanism for creating an environmentally safe and reliable HSS by introducing energy-saving technologies that can improve the quality and reduce the price of HCUS services.

The data analysis of the online survey of Russians in social networks in 2018-2019 is carried out. The average level of the population satisfaction with the quality of the provided services of HSS is determined.
Convergence of the carbon intensity of the economies of the Asia-Pacific and non-OECD countries to the level of the OECD countries
Authors: Filimonova Irina , Provornaya Irina , Nemov Vasily , Komarova Anna , Dzyuba Yuri
Published: June 2021

The global goal of the world community is the transition to a “green” economy, characterized by rational use of electricity, reduction of harmful emissions, and consumption of renewable energy sources. The purpose of the research was to study the convergence of capacity emissions in developing countries to European countries’ level. According to the results, countries striving for a lower emission intensity level to varying degrees. In non-OECD European countries, per capita income growth leads to a 0.26% reduction in emissions intensity. This fact means that economic growth creates additional resources that can be used to develop energy-efficient technologies. In the post-Soviet space and the Asia-Pacific region, a significant effect on reducing emission intensity is provided by environmental policy’s effectiveness to minimize carbon dioxide emissions.
Environmental Impact Assessment and Prevention Measures by Example PJSC “Gazprom”
Authors: Khulukshinov Denis
Published: June 2021

PJSC Gazprom carries out large-scale production activities following the principles of sustainable development and environmental preservation. The development of gasification and the transfer of transport to methane make a significant contribution to the improvement of the ecological situation in the constituent entities of the Russian Federation and the implementation of the federal project “Clean Air”. In 2019, the Comprehensive Environmental Program for 2020-2024 was developed and approved, it provides for a system of measures that corresponds to state objectives for the innovative environmental development of the Russian economy.
Comprehensive environmental assessment of innovative humic agro product
Authors: Kosolapova Natalia , Alferova Yekaterina , Miroshnichenko Olga , Protsenko Elena , Balabina Natalia
Published: June 2021

There has been made the assessment of the product «CAVITA BIOCOMPLEX» quality parameters, manufactured according to the innovative technology of ultrasonic cavitation processing of peat in water medium at high static pressure. To carry out this assessment it has been used the universal system of procedure of comprehensive assessment of humic products. This system is based on the level approach. It was found that the sample of agro product in the capacity of the main bioactive components contains fulvic and humic acids (47.2-64.0% calculated at dry weight basis). It is chemically and biologically safe for the environment. The usage of high-quality natural raw materials in combination with the “green” technology of “CAVITA BIOCOMPLEX” production makes it possible to use it not only as additional application with any mineral or organic fertilizers, plant protection products, herbicides, but also as basic fertilizer for biological agricultural technologies.
Application of cold plasma to control the microbiota composition on the surface of potato tubers
Authors: Golovin Mikhail L. , Orlova Valentina S. , Mazina Svetlana E. , Yakunin Valery G. , Kuznetsov Sergei V. , Savinov Vladimir P. , Timoshenko Viсtor Yu.
Published: June 2021

A study of the effect of low-temperature plasma on potato tubers was carried out. A comparative assessment of changes in the rate of germination, the size of shoots and the mass of shoots was carried out. Changes in the number of bacteria and fungi on the surface of tubers were analysed for different durations of exposure. It was found that growth characteristics did not change. The number of bacteria on the surface of tubers was significantly reduced due to the exposure to low-temperature plasma.
Critical periods of adaptation to oncogenic environmental factors at the stages of ontogenesis
Authors: Pinaev Sergey K. , Chizhov Alexey Ya. , Pinaeva Olga G.
Published: June 2021

The study of fluctuations in the incidence of neoplasms in children give us a possibility to identify critical periods of adaptation to oncogenic environmental factors at the stages of ontogenesis. This provides additional opportunities for the development of prevention measures of childhood malignant neoplasms.
On possibilities for development of human adaptive resources in arctic conditions
Authors: Semikin V.V. , Kochkin R.A. , Mezhina O. Yu. , Popova T.L.
Published: June 2021

This article presents the results of an experimental study aimed to investigate perspectives of the intentional development of adaptive resources of the human organism in the context of the harsh Arctic environmental conditions. The effectiveness of the author’s comprehensive psychophysical training program designed to develop mechanisms of human psycho-physiological and mental self-regulation has been tested in a formative experiment. The study was conducted on a sample of 18 clinically healthy female patients with an average age of 40±5.6 years and the northern experience of 18.3 ± 10.6 years. The results showed a significant change in several measurements indicating the improvement in some important characteristics of the functional state of subjects as a result of the psychophysical training. These changes suggest an increase in the adaptive potential of the subjects due to the formation experiment.
COVID-19, des vaccins à la vitesse de l’éclair
Authors: Feraoun Yanis , Maisonnasse Pauline , Le Grand Roger , Beignon Anne-Sophie
Published: June 2021

Un vaccin est nécessaire pour endiguer efficacement, à moyen et long terme, une pandémie comme celle de la COVID-19 (coronavirus disease 2019). Le développement de vaccins contre le virus responsable de la maladie, le SARS-CoV-2 (severe acute respiratory syndrome-coronavirus 2), a été débuté dès la publication de la séquence du génome viral. Ce développement a progressé à une vitesse sans précédent, avec un premier essai clinique réalisé peu de temps après, en mars 2020. Un an plus tard, une dizaine de vaccins reposant sur des concepts différents, dont certains n’avaient été testés que dans des essais cliniques, sont autorisés dans le cadre de procédures d’urgence. Dans cet article, nous passons en revue ces différents vaccins, nous comparons leurs propriétés et nous discutons les défis auxquels ils sont confrontés, en particulier l’émergence de nouveaux variants viraux.
Epistaxis in a Pediatric Outpatient Clinic: Could It be an Alarming Sign?
Authors: ElAlfy Mohsen Saleh , Tantawy Azaa Abdel Gawad , Eldin Badr Eldin Mostafa Badr , Mekawy Mohamed Amin , Mohammad Yasmeen Abd elAziz , Ebeid Fatma Soliman Elsayed
Published: June 2021

Introduction Epistaxis is a common presentation among children.

Objective To investigate the suitability of a simple tool of assessment for patients with epistaxis that could guide in subgrouping those with possible bleeding tendencies who may need further assessment.

Methods Children who presented to a tertiary outpatient clinic with epistaxis of an unknown cause were recruited. They underwent thorough clinical assessment and answered the pediatric bleeding questionnaire and the epistaxis severity score. All patients underwent complete blood count as well as coagulation profile, and confirmatory diagnostic tests were performed as needed.

Results Among the 30,043 patients who presented to the outpatient clinic over a year, 100 children had epistaxis, with an estimated annual frequency of 1 in 300. A total of 84% of the patients were younger than 12, and nearly half of these were younger than 6 years. Seventy-six patients had recurrent epistaxis, and 12 had systemic comorbidities. A significant higher percentage of patients presented with epistaxis in the hot months of the year. A total of 90% of the patients presented anterior bleeding, and the majority were treated with nasal compression only. Forty-three patients presented with epistaxis only; 37 of them were diagnosed as idiopathic epistaxis, and 6 had local causes. Fifty-seven patients presented with other bleeding manifestations, 47 of whom had a definite bleeding disorder and the other 10 had undiagnosed bleeding tendency. Those with other bleeding manifestations showed a higher frequency of positive family history of epistaxis; of being referred from a primary care physician; of having alarming low platelet count, and of presenting less seasonal variability. A bleeding score ≥ 2 showed significant value in suspecting an underlying systemic pathology as a cause of epistaxis.

Conclusion The pediatric bleeding questionnaire is a useful and simple tool in the identification of pediatric patients who need further diagnostic testing to detect any underlying bleeding tendency.
History Page: Leaders in MSK Radiology, Maria Curie-Skłodowska (1867–1934)
Authors: Sudoł-Szopińska Iwona , Panas-Goworska Marta
Published: June 2021

This history page in the series “Leaders in MSK radiology” is dedicated to the memory and achievements of the Polish researcher born in Warsaw and graduate of Sorbonne University, Maria Curie-Skłodowska, two-time Nobel Prize winner and the most well-known female scientist in the world, recognized as the pioneer of radiology.
Choosing the Most Appropriate Treatment Option for Pelvic Venous Disease: Stenting versus Embolization
Authors: Tanaka Mari E. , Kutsenko Oleksandra , Salazar Gloria
Published: June 2021

Pelvic venous disease (PeVD) in women encompasses a wide variety of entities all resulting in pelvic pain and varices. Successful treatment with percutaneous interventions is dependent on identifying underlying factors contributing to the disease and addressing them with either embolization of incompetent veins or stenting for venous stenoses. There are a multitude of embolization methods with marked practice heterogeneity. Moreover, with the ongoing development of dedicated venous stents in the treatment of chronic venous disease, there are more opportunities to consider this modality for the treatment of PeVD, as many patients present with combined vein reflux and central venous stenosis. The necessity to address both and the order of interventions in these patients is still to be elucidated. Here, we describe when to choose stenting or embolization for PeVD, their limitations, and our practice and identify further areas of research in this field.
Varicocele Embolization: Patient Selection: Preprocedure Workup, and Technical Considerations
Authors: Wadhwa Vibhor , Kashanian James A. , Schiffman Marc , McClure Timothy D.
Published: June 2021

Varicocele refers to an abnormally dilated and tortuous pampiniform venous plexus within the spermatic cord. The prevalence of varicocele is reported to be approximately 15% in the general male population. Its incidence increases with age and has a higher incidence in infertile men. Varicocele treatment (surgical or interventional) is considered one of the most common therapies of reversible infertility in men. Percutaneous embolization offers nonsurgical, minimally invasive option for the treatment of varicoceles, requiring only minimal sedation. In this article, the authors review the clinical and technical details of percutaneous varicocele embolization with a summary of currently available evidence.
Radiologic Imaging of Metabolic and Endocrine Disorders as They Affect the Hand and Wrist
Authors: Scullion Stephen , Grainger Andrew J. , Greenspan Adam
Published: June 2021

Metabolic and endocrine disorders have systemic effects on the musculoskeletal system, frequently producing characteristic changes in the hand and wrist. Radiographs historically played an instrumental role in the diagnostic pathway of many of these disorders, but the myriad of endocrinologic tests readily available to current clinicians may suggest their importance has lessened. We disagree. Recognition of these often subtle features can avoid the expense and psychological impact of an inappropriate diagnostic work-up, as well as expediting the diagnosis of potentially unsuspected disease. The metabolic and endocrine disorders discussed here are based on the distinctive changes produced around the hand and wrist.
Updates in Magnetic Resonance Venous Imaging
Authors: Lombardi Pamela , Carr James C. , Allen Bradley D. , Edelman Robert R.
Published: June 2021

For years, magnetic resonance angiography (MRA) has been a leading imaging modality in the assessment of venous disease involving the pelvis and lower extremities. Current advancement in noncontrast MRA techniques enables imaging of a larger subset of patients previously excluded due to allergy or renal insufficiency, allowing for preintervention assessment and planning. In this article, the current status of MR venography, with a focus on current advancements, will be presented. Protocols and parameters for MR venographic imaging of the pelvis and lower extremities, including contrast and noncontrast enhanced techniques, will be reviewed based on a recent literature review of applied MR venographic techniques. Finally, several disease-specific entities, including pelvic congestion and compression syndromes, will be discussed with a focus on imaging parameters that may best characterize these disease processes and optimize anatomical planning prior to intervention.
Neonates Born to COVID-19 Mother and Risk in Management within 4 Weeks of Life: A Single-Center Experience, Systematic Review, and Meta-Analysis
Authors: Falsaperla Raffaele , Giacchi Valentina , Lombardo Giulia , Mauceri Laura , Lena Germana , Saporito Marco Andrea Nicola , Vitaliti Giovanna , Palumbo Marco Antonio , Ruggieri Martino
Published: June 2021

Objective The new coronavirus infection from severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has been recognized as a global public health emergency, and neonates may be more vulnerable due to their immature immune system. The first aim of this study was to report our experience on the management of neonates from mothers with SARS-CoV-2 infection focusing on a 28-day follow-up since birth. The second aim is to assess how many data on neonatal outcomes of the first month of life are reported in literature, performing a systematic review and meta-analysis.

Study design We report our experience based on routine management of neonates born to mothers with SARS-CoV-2 infection and follow-up until 28 days of life.

Results In our experience at discharge, 1/48 (2.08%) of entrusted (mother refusing personal protective equipment) and none of separated presented positive nasopharyngeal swab (p = NS). All babies show good outcome at 28 days of life. The literature data show that the percentage of positive separated infants is significantly higher than the percentage of infants entrusted to positive mothers with appropriate control measures (13.63 vs. 2.4%; p = 0.0017). Meta-analysis of studies focused on follow-up showed a 2.94% higher risk of incidence of SARS-CoV-2 infection in entrusted newborns than in separated newborns (95% confidence interval: 0.39–22.25), but this was not significant (p = 0.30).

Conclusion A vertical transmission in utero cannot be totally excluded. Since in newborns, the disease is often ambiguous with mild or absent symptoms, it is important to define the most efficient joint management for infants born to COVID-19 positive mothers, being aware that the risk of horizontal transmission from a positive mother, when protective measures are applied, does not seem to increase the risk of infection or to affect the development of newborns from birth to first four weeks of life, and encourages the benefits of breastfeeding and skin-to-skin practice.

Key Points