bluuebunny/crossref_metadata_2025 huggingface dataset:
Proposal of accurate cup placement procedure during total hip arthroplasty based on pelvic tilt discrepancies in the lateral position
Authors: Tsukamoto Manabu , Kawasaki Makoto , Suzuki Hitoshi , Fujitani Teruaki , Sakai Akinori
Published: July 2021

By combining the anatomical-pelvic-plane (APP) positioner with a newly improved navigation system during total hip arthroplasty (THA), it is theoretically possible to determine cup orientation based on the APP while tracking pelvic movement. The purpose of this study was to determine the navigation accuracy and whether the error is related to the pelvic position fixed by the positioner. Fifty hips that underwent primary THA between 2018 and 2020 were analysed. The accuracy was 2.34° at radiographic inclination (RI) and − 5.01° at radiographic anteversion (RA), and the error was within 10° at both RI and RA in only 40 of 50 hips (80.0%). The discrepancy in pelvic sagittal tilt was correlated with the cup orientation error and especially strongly correlated with the RA error (r = − 0.751, p < 0.001). When RI and RA were calculated using a correction formula to determine the true cup orientation based on the pelvic tilt discrepancies, the error in both RI and RA was within 10° in all cases (100%). The navigation accuracy is related to the pelvic position fixed by the positioner, and the correction formula for the target angle that considers pelvic tilt discrepancies can lead to accurate cup placement in the future.
Differences among [18F]FDG PET-derived parameters in lung cancer produced by three software packages
Authors: Bos-Liedke Agnieszka , Cegla Paulina , Matuszewski Krzysztof , Konstanty Ewelina , Piotrowski Adam , Gross Magdalena , Malicki Julian , Kozak Maciej
Published: July 2021

Investigation of differences in derived [18F]FDG PET metabolic and volumetric parameters among three different software programs in lung cancer. A retrospective analysis was performed on a group of 98 lung cancer patients who underwent a baseline [18F]FDG PET/CT study. To assess appropriate delineation methods, the NEMA phantom study was first performed using the following software: Philips EBW (Extended Brilliance Workstation), MIM Software and Rover. Based on this study, the best cut-off methods (dependent on tumour size) were selected, extracted and applied for lung cancer delineation. Several semiquantitative [18F]FDG parameters (SUVmax, SUVmean, TLG and MTV) were assessed and compared among the three software programs. The parameters were assessed based on body weight (BW), lean body mass (LBM) and Bq/mL. Statistically significant differences were found in SUVmean (LBM) between MIM Software and Rover (4.62 ± 2.15 vs 4.84 ± 1.20; p < 0.005), in SUVmean (Bq/mL) between Rover and Philips EBW (21,852.30 ± 21,821.23 vs 19,274.81 ± 13,340.28; p < 0.005) and Rover and MIM Software (21,852.30 ± 21,821.23 vs 19,399.40 ± 10,051.30; p < 0.005), and in MTV between MIM Software and Philips EBW (19.87 ± 25.83 vs 78.82 ± 228.00; p = 0.0489). This study showed statistically significant differences in the estimation of semiquantitative parameters using three independent image analysis tools. These findings are important for performing further diagnostic and treatment procedures in lung cancer patients.
Targeting of SET/I2PP2A oncoprotein inhibits Gli1 transcription revealing a new modulator of Hedgehog signaling
Authors: Serifi Iliana , Besta Simoni , Karetsou Zoe , Giardoglou Panagiota , Beis Dimitris , Niewiadomski Pawel , Papamarcaki Thomais
Published: July 2021

The Hedgehog (Hh)/Gli signaling pathway controls cell proliferation and differentiation, is critical for the development of nearly every tissue and organ in vertebrates and is also involved in tumorigenesis. In this study, we characterize the oncoprotein SET/I2PP2A as a novel regulator of Hh signaling. Our previous work has shown that the zebrafish homologs of SET are expressed during early development and localized in the ciliated organs. In the present work, we show that CRISPR/Cas9-mediated knockdown of setb gene in zebrafish embryos resulted in cyclopia, a characteristic patterning defect previously reported in Hh mutants. Consistent with these findings, targeting setb gene using CRISPR/Cas9 or a setb morpholino, reduced Gli1-dependent mCherry expression in the Hedgehog reporter zebrafish line Tg(12xGliBS:mCherry-NLS). Likewise, SET loss of function by means of pharmacological inhibition and gene knockdown prevented the increase of Gli1 expression in mammalian cells in vitro. Conversely, overexpression of SET resulted in an increase of the expression of a Gli-dependent luciferase reporter, an effect likely attributable to the relief of the Sufu-mediated inhibition of Gli1. Collectively, our data support the involvement of SET in Gli1-mediated transcription and suggest the oncoprotein SET/I2PP2A as a new modulator of Hedgehog signaling.
Marginal and internal fit and intaglio surface trueness of interim crowns fabricated from tooth preparation of four finish line locations
Authors: Son Keunbada , Son Young-Tak , Lee Ji-Min , Lee Kyu-Bok
Published: July 2021

This study evaluated the marginal and internal fit and intaglio surface trueness of interim crowns fabricated from tooth preparation scanned at four finish line locations. The right maxillary first molar tooth preparation model was fabricated using a ceramic material and placed in four finish line locations (supragingival, equigingival, subgingival, and subgingival with a cord). Intraoral scanning was performed. Crowns were designed based on the scanned area. Interim crowns were fabricated using a stereolithography three-dimensional (3D) printer (N = 16 per location). Marginal and internal fit were evaluated with a silicone replica technique. Intaglio surface trueness was evaluated using a 3D inspection software. One-way analysis of variance and Tukey HSD test were performed for comparisons (α = 0.05). The marginal and internal fit showed significant differences according to locations (P < 0.05); the marginal fit showed the best results in the supragingival finish line (P < 0.05). Intaglio surface trueness was significantly different in the marginal region, with the highest value in the subgingival location (P < 0.05). Crowns fabricated on the subgingival finish line caused inaccurate marginal fit due to poor fabrication reproducibility of the marginal region. The use of an intraoral scanner should be decided on the clinical situation and needs.
Correction: Antibacterial activity of a dual peptide targeting the Escherichia coli sliding clamp and the ribosome
Authors: André Christophe , Veillard Florian , Wolff Philippe , Lobstein Anne-Marie , Compain Guillaume , Monsarrat Clément , Reichhart Jean-Marc , Burnouf Dominique Y. , Guichard Gilles , Wagner Jérôme E.
Published: July 2021

Correction for ‘Antibacterial activity of a dual peptide targeting the Escherichia coli sliding clamp and the ribosome’ by Christophe André et al., RSC Chem. Biol., 2020, 1, 137–147, DOI: 10.1039/D0CB00060D.
Scandium and lanthanum hydride complexes stabilized by super-bulky penta-arylcyclopentadienyl ligands
Authors: Wang Yang , Del Rosal Iker , Qin Guorui , Zhao Lanxiao , Maron Laurent , Shi Xianghui , Cheng Jianhua
Published: July 2021

Bimetallic scandium complex [(CpAr5)Sc(H)(μ-OC4H9)]2 (CpAr5 = C5Ar5, Ar = 3,5-iPr2-C6H3) (2) with two terminal hydrido ligands, and lanthanum hydride complex [(CpAr5)La(μ-H)]2 (4) bearing the reduced CpAr5 ligand were obtained.
RNA diversification by a self-reproducing ribozyme revealed by deep sequencing and kinetic modelling
Authors: Jeancolas Cyrille , Matsubara Yoshiya J. , Vybornyi Mykhailo , Lambert Camille N. , Blokhuis Alex , Alline Thomas , Griffiths Andrew D. , Ameta Sandeep , Krishna Sandeep , Nghe Philippe
Published: July 2021

The integration of self-reproduction and diversification mechanisms in RNA reaction networks paves the way for experimental tests of prebiotic evolution.
Nuclearity expansion in Pd clusters triggered by the migration of a phenyl group in cyclooligosilanes
Authors: Shimamoto Kento , Sunada Yusuke
Published: July 2021

Heptanuclear palladium clusters were synthesized via the reaction of [Pd(CNtBu)2]3 with Ph-substituted cyclooligosilanes. The generation of the SiPh moiety upon migration of a Ph group is the key to assembling the seven palladium atoms effectively.
Ni-Catalyzed C(sp2)–H alkylation of N-quinolylbenzamides using alkylsilyl peroxides as structurally diverse alkyl sources
Authors: Tsuzuki Saori , Sakurai Shunya , Matsumoto Akira , Kano Taichi , Maruoka Keiji
Published: July 2021

A Ni-catalyzed direct C–H alkylation of N-quinolylbenzamides using alkylsilyl peroxides as alkyl-radical precursors is described.
Chemo-, regio- and stereoselective synthesis of monofluoroalkenes via a tandem fluorination–desulfonation sequence
Authors: Yang Ren-Yin , Xu Bo
Published: July 2021

A widely applicable approach for the synthesis of Z-monofluoroalkenes from readily available alkyl triflones and NFSI has been reported.
Further investigations of the crystal-to-crystal phase transition of a [2]pseudorotaxane composed of ferrocene-terminated dialkylammonium and dibenzo[24]crown-8-ether
Authors: Suzaki Yuji , Fukuchi Yugo , Tadami Hiroko , Koizumi Take-aki , Osakada Kohtaro , Ide Tomohito , Horie Masaki , Hoshino Norihisa , Akutagawa Tomoyuki
Published: July 2021

A pseudorotaxane with different or mixed counter anions undergoes thermal phase transition, which is related to the interaction between the counter anion and macrocyclic component.
Efficient capturing of hydrogen peroxide in dilute aqueous solution by co-crystallization with amino acids
Authors: Yamaguchi Ryota , Tanaka Rika , Maetani Mayu , Tabe Hiroyasu , Yamada Yusuke
Published: July 2021

X-ray structure analyses of co-crystals of H2O2 and l-Phe, dl-Phe, or dl-Asp prepared in a dilute aqueous solution (30 wt%) indicated that multi-layer motifs including water molecule is important for highly efficient H2O2 capture in dilute solutions.
Protonation states at different pH, conformational changes and impact of glycosylation in synapsin Ia
Authors: Mir Sonia , Ashraf Sajda , Saeed Maria , Rahman Atta-ur , Ul-Haq Zaheer
Published: July 2021

Synapsin I (SynI) is the most abundant brain phosphoprotein present at presynaptic terminals that regulates neurotransmitter release, clustering of synaptic vesicles (SVs) at active zones, and stimulates synaptogenesis and neurite outgrowth.
Giant tunneling electroresistance arising from reversible partial barrier metallization in the NaTiO3/BaTiO3/LaTiO3 ferroelectric tunnel junction
Authors: Xiao Wei , Kang Lili , Hao Hua , Zhou Yanhong , Zhang Lei , Zheng Xiaohong , Zeng Zhi
Published: July 2021

Based on density functional calculations, two on/off states are obtained in the NaTiO3/BaTiO3/LaTiO3 ferroelectric tunnel junction, leading to a TER ratio as high as 3.20 × 108% due to reversible partial barrier metallization under an electric field.
Probing the interactions of GlcNH2 with boric acid via NMR spectroscopy
Authors: Jia Lingyu , Liu Rui , Lv Jiayu , Liu Luqi , Zhang Zhenzhou , Wang Yingxiong , Hou Xianglin
Published: July 2021

A 1 : 1 chelate boron complex coordinated at cis-1,2 positions of GlcNH2 was identified as the major species via1H and 13C INEPT DOSY NMR spectroscopy, 1H–15N HSQC spectra, and spin–lattice relaxation times (T1) of the 13C1 nucleus.
Kinetic and thermodynamic stability comparison for the fibrillar form of small amyloid-β(1–42) oligomers using scaled molecular dynamics
Authors: Saha Debasis , Jana Biman
Published: July 2021

Scaled molecular dynamics technique has been used to convert amyloid fibrils to random aggregates. Free energies for an order-to-disorder transition from the application of a free energy extrapolation technique show variations of amyloid fibrils’ stability with size.
Correction: The role of energy cost on accuracy, sensitivity, specificity, speed and adaptation of T cell foreign and self recognition
Authors: Shin Gyubaek , Wang Jin
Published: July 2021

Correction for ‘The role of energy cost on accuracy, sensitivity, specificity, speed and adaptation of T cell foreign and self recognition’ by Gyubaek Shin et al., Phys. Chem. Chem. Phys., 2021, 23, 2860–2872, DOI: 10.1039/D0CP02422H.
Biosensing with DNAzymes
Authors: McConnell Erin M. , Cozma Ioana , Mou Quanbing , Brennan John D. , Lu Yi , Li Yingfu
Published: July 2021

This article provides a comprehensive review of biosensing with DNAzymes, providing an overview of different sensing applications while highlighting major progress and seminal contributions to the field of portable biosensor devices and point-of-care diagnostics.
Facile rearrangement of molecular layer deposited metalcone thin films by electron beam irradiation for area selective atomic layer deposition
Authors: Lee Seunghwan , Baek GeonHo , Kim Hye-mi , Kim Yong-Hwan , Park Jin-Seong
Published: July 2021

Metalcone films can be rearranged from amorphous structures to 2D-like carbon by electron beam irradiation. The irradiated indicone (HQ) film can be used as an inhibitor for selective deposition delaying 20 cycles of ALD of ZnO.
Lanthanide complexes of DOTA–nitroxide conjugates for redox imaging: spectroelectrochemistry, CEST, relaxivity, and cytotoxicity
Authors: Mouchel Dit Leguerrier D. , Barré R. , Ruet Q. , Imbert D. , Philouze C. , Fries P. H. , Martel-Frachet V. , Molloy J. K. , Thomas F.
Published: July 2021

The lanthanide(iii) complexes (Gd, Eu, Dy, and Yb) of DOTA tris(amide) and bis(amide) derivatives (L1 and L2) featuring one redox active TEMPO arm were prepared.
Sustainable catalytic epoxidation of biorenewable terpene feedstocks using H2O2 as an oxidant in flow microreactors
Authors: Tibbetts Joshua D. , Cunningham William B. , Vezzoli Massimiliano , Plucinski Pawel , Bull Steven D.
Published: July 2021

Sustainable solvent-free continuous flow epoxidation of biorenewable terpenes using a recyclable tungsten-based polyoxometalate phase transfer catalyst and benign H2O2 oxidant.
Fused filament fabrication 3D printed polylactic acid electroosmotic pumps
Authors: Wu Liang , Beirne Stephen , Cabot Joan Marc , Paull Brett , Wallace Gordon G. , Innis Peter C.
Published: July 2021

Fused filament fabrication (FFF)-3D printed polylactic acid capillary structure base on “body centre cubic (BCC)” log-pile like filament arrangements utilising the negative print space technique.
Ag(i)/(S,S)-ip-FOXAP catalyzed diastereo- and enantioselective 1,3-dipolar cycloaddition of azomethine ylides with benzosultam-3-ylidenes
Authors: Jiao Luzhen , Cao Guorui , Teng Dawei
Published: July 2021

The AgOAc/ip-FOXAP complex catalyzed the highly diastereo- and enantioselective 1,3-dipolar cycloaddition of azomethine ylides with benzosultam-3-ylidenes to give a single isomer of the exo-cycloadduct in good yields.
Preferential killing of bacterial cells by surface-modified organosilane-treated ZnO quantum dots synthesized through a co-precipitation method
Authors: Ragupathi Hariventhan , Choe Youngson , M. Antony Arockiaraj
Published: July 2021

The aim of this study was to screen and determine the significant antibacterial/antiviral activities of surface-modified ZnO@MPS QDs owing to their impressive activities against microorganisms.
Development and application of a microwave loop reactor radiating through a leaky coaxial antenna(s)
Authors: Lin Shengjie , Peng Yanqing , Li Yu , Wang Jiayi , Song Gonghua
Published: July 2021

This article introduces an MW-loop reactor which can perform excellent circulation due to the presence of an antenna, without external gas injection.
Surface defect engineering and morphology control of graphitic carbon nitride with synergistically improved photocatalytic performance
Authors: Zhang Tingting , Xing Weinan , Li Haoxin , Cai Zhangzhen , Zhang Yichi , Liu Chaoke , Li Pingping
Published: July 2021

g-C3N4 based on defects and ultrathin nanosheets (CNDNS) has been constructed through in situ vapor treatment. CNDNS exhibits a high degradation activity.
Synthesis of hydroxymethyl analogues of mannostatin A and their evaluation as inhibitors of GH38 α-mannosidases
Authors: Kalník Martin , Zajičková Mária , Kóňa Juraj , Šesták Sergej , Moncoľ Ján , Koóš Miroslav , Bella Maroš
Published: July 2021

Analogues of mannostatin A were synthesised and evaluated as inhibitors of GH38 α-mannosidases. Different regioselectivity of aziridine opening with sodium methanethiolate was observed and investigated by quantum mechanics calculations.
Photo-controlled bipolar absorption switches based on 5-dimethylamino substituted indoline spiropyrans with semipermanent merocyanines
Authors: Metelitsa Anatoly , Chernyshev Anatoly , Voloshin Nikolai , Demidov Oleg , Solov’eva Ekaterina , Rostovtseva Irina , Gaeva Elena
Published: July 2021

A new element for molecular logic and all-optical information processing is proposed on the basis of P- and T-type photochromic systems existing as equilibrium of isomeric forms.
Aza-aromatic polycycles based on triphenylene and acridine or acridone: synthesis and properties
Authors: Bouarfa Salima , Jéhan Philippe , Erb William , Mongin Olivier , Porée François-Hugues , Roisnel Thierry , Bentabed-Ababsa Ghenia , Le Yondre Nicolas , Mongin Florence
Published: July 2021

Our attempts to N-arylate anilines with 2-iodotriphenylene and then cyclize with the adjacent carbonyl group are reported.
A triphenylamine derived fluorescent probe for efficient detection of H2S based on aggregation-induced emission
Authors: Li Jiaojiao , Zhong Keli , Tang Lijun , Yan Xiaomei
Published: July 2021

The probe TPA-HS can quickly identify H2S (20 minutes) and release TPA-CHO with aggregation-induced emission properties.
Anti-mycobacterial natural products and mechanisms of action
Authors: Han Jianying , Liu Xueting , Zhang Lixin , Quinn Ronald J. , Feng Yunjiang
Published: July 2021

This review summarises the molecular targets of 53 anti-TB natural products and highlights the compounds with novel targets and activity against drug-resistant TB.
Folding and duplex formation in mixed sequence recognition-encodedm-phenylene ethynylene polymers
Authors: Iadevaia Giulia , Swain Jonathan A. , Núñez-Villanueva Diego , Bond Andrew D. , Hunter Christopher A.
Published: July 2021

One pot oligomerisation reactions give access to families of oligomers that allow facile analysis of folding propensity and assessment of suitability for sequence-selective duplex formation.
A decade of innovation and progress in understanding the morphology and structure of heterogeneous polymers in rigid confinement
Authors: Ok Salim , Vayer Marylène , Sinturel Christophe
Published: July 2021

Confining the polymers influences their properties, while opening new platforms for novel applications at the nanometer scale.
Non‐intrusive load monitoring by voltage–current trajectory enabled asymmetric deep supervised hashing
Authors: Han Yinghua , Xu Yao , Huo Yaxin , Zhao Qiang
Published: July 2021

With the development of smart grids, appliance‐level data information plays a vital role in smart power consumption. Nowadays, appliance signatures detected by non‐intrusive load monitoring (NILM) can be used for anomaly detection, demand response, and electricity management. These applications increase the requirements for the accuracy of appliance identification in NILM. And it has been proved that the voltage–current (V–I) trajectory can be applied as an effective load signature to represent the electrical characteristics of appliances with different statuses in previous researches. In this paper, a V–I trajectory enabled asymmetric deep supervised hashing (ADSH) method has been proposed for NILM. ADSH method converts load identification into the large‐scale approximate nearest neighbour search. Different from the existing methods, ADSH treats the query images and database images in an asymmetric way in order to improve accuracy. More specifically, ADSH learns a deep hash function only for query images, while the hash codes for database images are directly learned. The experimental results on REDD and PLAID datasets show that the proposed method significantly improves the accuracy of load identification compared with state‐of‐art methods.
Time‐domain signal and noise modelling and analysis of millimetre‐wave and THz high electron mobility transistors
Authors: Mohammadzade Alireza , Abdipour Abdolali , Askarpour Amir N.
Published: July 2021

This study presents the simultaneous signal and noise modelling and analysis of mm‐wave/THz high electron mobility transistors (HEMTs) in the linear regime as stochastic active multi‐conductor transmission lines (SAMTLs). For such devices, stochastic inhomogeneous telegrapher equations of SAMTLs are extracted assuming the domination of the quasi‐transverse electromagnetic mode. Analytical solutions for these equations do not exist. So a numerical analysis of such equations is introduced here at millimetre‐wave and terahertz frequencies. These equations are analysed with a numerical method in the time domain, namely the finite‐integration technique. A semi‐distributed model in the advanced design system commercial software is used to validate the numerical results. Also, the results of noise figure and scattering parameters (S‐parameters) for the metal–semiconductor field‐effect transistor transistor, which has the same SAMTLs model as the HEMT transistor, are compared with the measurement reports at microwave frequencies.
Characterization of densePlanckclumps observed withHerscheland SCUBA-2
Authors: Mannfors E. , Juvela M. , Bronfman L. , Eden D. J. , He J. , Kim G. , Kim K.-T. , Kirppu H. , Liu T. , Montillaud J. , Parsons H. , Sanhueza P. , Shang H. , Soam A. , Tatematsu K. , Traficante A. , Väisälä M. S. , Lee C. W.
Published: July 2021

Context.Although the basic processes of star formation (SF) are known, more research is needed on SF across multiple scales and environments. ThePlanckall-sky survey provided a large catalog of Galactic cold clouds and clumps that have been the target of several follow-up surveys.

Aims.We aim to characterize a diverse selection of dense, potentially star-forming cores, clumps, and clouds within the Milky Way in terms of their dust emission and SF activity.

Methods.We studied 53 fields that have been observed in the JCMT SCUBA-2 continuum survey SCOPE and have been mapped withHerschel. We estimated dust properties by fittingHerschelobservations with modified blackbody functions, studied the relationship between dust temperature and dust opacity spectral indexβ, and estimated column densities. We extracted clumps from the SCUBA-2 850 μm maps with the FellWalker algorithm and examined their masses and sizes. Clumps are associated with young stellar objects found in several catalogs. We estimated the gravitational stability of the clumps with virial analysis. The clumps are categorized as unbound starless, prestellar, or protostellar.

Results.We find 529 dense clumps, typically with high column densities from (0.3–4.8) × 1022cm−2, with a mean of (1.5 ± 0.04) ×1022cm−2, low temperatures (T ∼ 10–20 K), and estimated submillimeterβ= 1.7 ± 0.1. We detect a slight increase in opacity spectral index toward millimeter wavelengths. Masses of the sources range from 0.04M⊙to 4259M⊙. Mass, linear size, and temperature are correlated with distance. Furthermore, the estimated gravitational stability is dependent on distance, and more distant clumps appear more virially bound. Finally, we present a catalog of properties of the clumps.

Conclusions.Our sources present a large array of SF regions, from high-latitude, nearby diffuse clouds to large SF complexes near the Galactic center. Analysis of these regions will continue with the addition of molecular line data, which will allow us to study the densest regions of the clumps in more detail.
Eigenspectra of solar active region long-period oscillations
Authors: Dumbadze G. , Shergelashvili B. M. , Poedts S. , Zaqarashvili T. V. , Khodachenko M. , De Causmaecker P.
Published: July 2021

Context. We studied the low-frequency ≲0.5 h−1 (long-period ≳2 h) oscillations of active regions (ARs). The investigation is based on an analysis of a time series built from Solar Dynamics Observatory/Helioseismic and Magnetic Imager photospheric magnetograms and comprises case studies of several types of AR structures.

Aims. The main goals are to investigate whether ARs can be engaged in long-period oscillations as unified oscillatory entities and, if so, to determine the spectral pattern of such oscillations.

Methods. Time series of characteristic parameters of the ARs, such as, the total area, total unsigned radial magnetic flux, and tilt angle, were measured and recorded using the image moment method. The power spectra were built out of Gaussian-apodised and zero-padded datasets.

Results. There are long-period oscillations ranging from 2 to 20 h, similarly to the characteristic lifetimes of super-granulation, determined from the datasets of the AR total area and radial magnetic flux, respectively. However, no periodicity in tilt angle data was found.

Conclusions. Whatever nature these oscillations have, they must be energetically supported by convective motions beneath the solar surface. The possible interpretations can be related to different types of magnetohydrodynamic oscillations of the multi-scale structure of the AR magnetic field, which is probably linked with the characteristic turnover timescales of the super-granulation cells. The presence of oscillations in the radial magnetic flux data may be connected to periodic flux emergence or cancellation processes.
Implications of the lowest frequency detection of the persistent counterpart of FRB121102
Authors: Resmi L. , Vink J. , Ishwara-Chandra C. H.
Published: July 2021

Context. The repeating FRB121102 is so far the only extragalactic fast radio burst found to be associated with a counterpart, that is to say a steady radio source with a nearly flat spectral energy distribution (SED) in centimeter wavelengths.

Aims. Previous observations of the persistent source down to 1.6 GHz have not provided a sign of a spectral turnover. Absorption is expected to eventually cause a turnover at lower frequencies. Better constraints on the physical parameters of the emitting medium can be derived by detecting the self-absorption frequency.

Methods. We used the Giant Metre-Wave Radio Telescope during the period of July to December 2017 to observe the source at low radio frequencies down to 400 MHz.

Results. The spectral energy distribution of the source remains optically thin even at 400 MHz, with a spectral index of ν−(0.07 ± 0.03), which is similar to what is seen in Galactic plerions. Using a generic synchrotron radiation model, we obtain constraints on properties of the nonthermal plasma and the central engine powering it.

Conclusions. We present low frequency detections of the persistent source associated with FRB121102. Its characteristic flat SED extends down to 400 MHz. Similar to models for Galactic plerions, we assume that the energy in the persistent source is carried predominantly by leptons. The emitting plasma has a B < 0.01 G, and its age is >524(B/0.01 G)−3/2 yr. We show that the energetics of the persistent source requires an initial spin period shorter than 36 ms, and the magnetic field of the neutron star must exceed 4.5 × 1012 G. This implies that the persistent source does not necessarily require energetic input from a magnetar.
A shock near the virial radius of the Perseus Cluster
Authors: Zhu Z. , Simionescu A. , Akamatsu H. , Zhang X. , Kaastra J. S. , de Plaa J. , Urban O. , Allen S. W. , Werner N.
Published: July 2021

Context. Previous X-ray studies of the Perseus Cluster, consisting of 85 Suzaku pointings along eight azimuthal directions, revealed a particularly steep decrease in the projected temperature profile near the virial radius (∼r200) towards the northwest (NW).

Aims. To further explore this shock candidate, another 4 Suzaku observations on the NW edge of the Perseus Cluster have been obtained. These deeper data were designed to provide the best possible control of systematic uncertainties in the spectral analysis.

Methods. Using the combined Suzaku observations, we have carefully investigated this interesting region by analyzing the spectra of various annuli and extracting projected thermodynamic profiles.

Results. We find that the projected temperature profile shows a break near r200, indicating a shock with ℳ = 1.9 ± 0.3. Corresponding discontinuities are also found in the projected emission measure and the density profiles at the same location. This evidence of a shock front so far away from the cluster center is unprecedented, and may provide a first insight into the properties of large-scale virial shocks which shape the process of galaxy cluster growth.
Multi-spacecraft study of the solar wind at solar minimum: Dependence on latitude and transient outflows
Authors: Laker R. , Horbury T. S. , Bale S. D. , Matteini L. , Woolley T. , Woodham L. D. , Stawarz J. E. , Davies E. E. , Eastwood J. P. , Owens M. J. , O’Brien H. , Evans V. , Angelini V. , Richter I. , Heyner D. , Owen C. J. , Louarn P. , Fedorov A.
Published: July 2021

Context. The recent launches of Parker Solar Probe, Solar Orbiter (SO), and BepiColombo, along with several older spacecraft, have provided the opportunity to study the solar wind at multiple latitudes and distances from the Sun simultaneously.

Aims. We take advantage of this unique spacecraft constellation, along with low solar activity across two solar rotations between May and July 2020, to investigate how the solar wind structure, including the heliospheric current sheet (HCS), varies with latitude.

Methods. We visualise the sector structure of the inner heliosphere by ballistically mapping the polarity and solar wind speed from several spacecraft onto the Sun’s source surface. We then assess the HCS morphology and orientation with the in situ data and compare this with a predicted HCS shape.

Results. We resolve ripples in the HCS on scales of a few degrees in longitude and latitude, finding that the local orientations of sector boundaries were broadly consistent with the shape of the HCS but were steepened with respect to a modelled HCS at the Sun. We investigate how several CIRs varied with latitude, finding evidence for the compression region affecting slow solar wind outside the latitude extent of the faster stream. We also identified several transient structures associated with HCS crossings and speculate that one such transient may have disrupted the local HCS orientation up to five days after its passage.

Conclusions. We have shown that the solar wind structure varies significantly with latitude, with this constellation providing context for solar wind measurements that would not be possible with a single spacecraft. These measurements provide an accurate representation of the solar wind within ±10° latitude, which could be used as a more rigorous constraint on solar wind models and space weather predictions. In the future, this range of latitudes will increase as SO’s orbit becomes more inclined.
Tracing satellite planes in the Sculptor group
Authors: Martínez-Delgado David , Makarov Dmitry , Javanmardi Behnam , Pawlowski Marcel S. , Makarova Lidia , Donatiello Giuseppe , Lang Dustin , Román Javier , Vivas Kathy , Carballo-Bello Julio A.
Published: July 2021

Context.In recent years, a new generation of large-scale imaging surveys have probed wide field regions for the first time around some nearby galaxies in an unprecedentedly low surface-brightness regime (∼28.0−29.0 mag arcsec−2). This provides the chance to discover very faint dwarf satellites by means of systematic visual inspection of these public deep images.

Aims.In this paper, we report the first results of a systematic survey of faint dwarf spheroidal galaxies in the vicinity of the bright late-type spiral galaxy NGC 253 by means of a visual inspection of the images taken by the Dark Energy Survey.

Methods.We performed a new NGC 253 satellite search using co-added image cutouts reprocessed in the DESI Legacy image surveys. We usedGALFITsoftware to investigate the photometric and structural properties of three dwarf galaxies.

Results.We report the discovery of three new dwarf galaxies in the vicinity of the brightest member of the Sculptor filament, the late-type spiral NGC 253, located at a distance of 3.7 Mpc towards Anti-Virgo. We name them Do II, Do III, and Do IV. Assuming they are companions of NGC 253, their total absoluteV-magnitudes fall in the −7 to −9 mag range, which is typical for dwarf satellites in the local Universe. The central surface brightness tends to be extremely low for all three discovered dwarfs and falls roughly in the range of 25−26 mag arcsec−2ing-band. Using known data on distances and velocities of galaxies, we estimate the total virial mass of the NGC 253 group to be 8 × 1011 M⊙, which gives a virial radius ofR200 = 186 kpc and a turn-around radius of 706 kpc. We also discuss the possible existence of a spatially flattened and velocity-correlated satellite system around NGC 253. This large-scale structure is orientated almost edge-on to the line of sight. The possible plane of satellites is only 31 kpc thick with a minor-to-major axis ratio of 0.14. Four out of five galaxies with measured velocities follow a common velocity trend similar to those observed in the planes of satellites around the Andromeda and Centaurus A galaxies. However, the small number of galaxies with known velocities prevents us from reaching a definitive conclusion about the formation scenario of the structure and its possible relation to the surrounding cosmic web.
New technical solution for resource-saving tasks in chemical plant protection
Authors: Borisenko Ivan , Meznikova Marina , Chamurliev Omariy , Ulybina Ekaterina
Published: July 2021

The problems in the production of row crops are considered. The technical solution in the field of chemical protection of plants, aimed at obtaining high quality products while reducing the cost of production, is offered. The retrofitting of serial boom sprayers with special divider bodies makes it possible to retain the function of continuous spraying with the possibility of chemical treatment in strips at the desired phase of growth and development of cultivated plants. It also describes the possibility of solving environmental problems in the agricultural industry by reducing the chemical load on the soil.
Simulation modeling in assessing the agricultural enterprise state in an emergency
Authors: Zhichkin Kirill , Nosov Vladimir , Zhichkina Lyudmila , Fomenko Natalia
Published: July 2021

The article proposes a methodology for assessing the sufficiency of financial resources in an emergency. The purpose of the study is to develop a methodology based on the method of simulation modeling to assess the sufficiency of resources and the sustainability of an agricultural enterprise in the event of an emergency. This set of methods for assessing the availability of enterprise financial resources for overcoming emergencies was implemented using algorithms for simulation of enterprise financial flows and their assessment in the program for investment calculations Project Expert 7.19. The program allows you to build simulation models of an enterprise, regardless of their industry and specificity. With the help of this software complex, it is possible not only to build a simulation model of an enterprise, but also to carry out its statistical evaluation. Together with the proposed method of detailing the initial data of annual financial and economic documents, this set of methods is a powerful tool for building and evaluating simulation models of agricultural and other enterprises, taking into account fluctuations in cash flow values during the year. Thus, the accuracy of the estimates obtained is significantly increased in comparison with methods based on the analysis of relative indicators or coefficients.
Bacillus subtilis for biological protection of Taxus baccata L. in landscape gardens
Authors: Kopyltsov Sergey , Gneush Anna
Published: July 2021

The fungistatic effect of the endophytic strain of Bacillus subtilis in park stands of Taxus baccata L. var. “Fastigiata”. The study used trees in park stands with symptoms of damage by the phytopathogenic fungus Cryptocline taxicola (All.) Petr. It was found that treatment of shoots with a suspension of microorganisms Bacillus subtillis strain krd-20 in the autumn and spring prevented the development of the disease and the fall of needles. RAPD-PCR was used to determine that the strain was capable of endophytic development and was preserved in the coniferous tree for at least six months.
The effectiveness of the use of microbiological preparations when interacting with seed stocks of the genus Prunus L.
Authors: Kuznetsova Anna , Gridnev Sergey , Drygina Anna
Published: July 2021

An important element of increasing the efficiency of production of high-quality planting material of fruit crops according to the criteria of environmental management, resource conservation and productivity is the use of adaptive, technological rootstocks, as well as microbiological preparations that are environmentally friendly and multifunctional. They stimulate plant growth by changing their hormonal status, act as fungicides, as bio protectors, forcing the plant turn into its defense mechanisms, as bio fertilizers that promote the absorption of atmospheric nitrogen by plants, hard-to-reach forms of phosphorus, a number of trace elements, have an anti-stress effect, etc. To control the process of obtaining seedlings of the highest quality category, it is necessary to study the living system “plant-microbiological preparation-environment”. As a result of this research, it was found that the high temperature background in combination with severe drought, observed during the years of research, adversely affected both the development of rootstocks in the first field of the nursery, and the effect of microbiological preparations. When developing resource-saving elements in technology - the selection of genotypes and microbiological preparations for growing rootstocks, bypassing the school of seedlings, form 3-106 was highlighted, when using the preparation Pseudobacterin-2. Found a regularity - a positive interaction in the conditions of the Ust-Labinsk district of OLL “Experimental Nursery (EN) named after K.A. Timiryazev” seedlings of rootstocks for sweet cherry and cherry, of different origin, and the preparation Pseudobacterin-2. In conditions of high temperatures in the spring-summer period, the isolated preparation increased the germination capacity and the yield of high-quality planting material.
Biologically active fungi of the genus Trichoderma as a perspective means of environmentally safe plant protection
Authors: Khalikova Liliya , Borovkova Natalia , Semkina Oksana , Korchikov Evgeniy
Published: July 2021

Antagonism of fungi of the genus Trichoderma and various phytopathogenic fungi was investigated. The strains of the genus Trichoderma, which have potential value for the production of biological products for plant protection, have been identified. The highest fungicidal activity among the tested strains is shown by T. asperellum, which determines the prospects of using this strain as a biofungicide. The investigations were carried out in the research laboratory of the Peasant Farm “Tsirulev E.P.”
Identification of Sakura interspecific hybrids in Prunus collections
Authors: Stepanov Ilya , Balapanov Ilnur , Drygina Anna
Published: July 2021

The use of IRAP and ISSR markers for the genetic analysis of Cerasus and Padus samples from the NCFRCHVW collection made it possible to establish the collection genetic structure and identify interspecific hybrids of cherry trees. Clustering of genotyped samples revealed 4 main clusters: 1) Bird cherry; 2) Cherries; 3) Interspecific hybrids of sakura; 4) Sakura. Most of the hybrid forms of sakura and cherries have formed a separate group, which is different from both sour and sweet cherry varieties, and from the classic sakura varieties. Also, some samples were identified that were assigned to groups that were not typical for them. These samples include the genotype of the Sibirskaya krasavitsa bird cherry, AI72 rootstock, Podbelskaya cherry, Polskaya sakura and ornamental cherry Rexii. In general, ISSR and IRAP markers have demonstrated their effectiveness as tools for genetic analysis of Prunus collections and identification of genotypes arising in the course of interspecific hybridization.
Automation of crop production in the Siberian region with the development of precision farming technologies
Authors: Dokin Boris , Aletdinova Anna
Published: July 2021

The development of precision farming technologies in the Siberian region of Russia has a long history. Already in the 80s, the first design solutions appeared, their authors received patents and certificates. But only in the last ten years, with the development of information and communication technologies, with the advent of GPS and Global Navigation Satellite Systems (GLONASS), the production of aggregates for precision farming technologies has expanded. The authors give examples of developments of the Siberian Institute of Mechanization and Electrification of Agriculture, analyze the current state of development of automation of crop production in the Siberian region. By the end of 2020, there are 65 mobile applications to support precision farming technologies. The authors conducted a comparative analysis of them with their foreign counterparts; based on the assessments of Russian crop specialists, the most popular ones were identified.
Use of multi-temporal Earth remote sensing data for the assessment of agricultural area
Authors: Melentiev Anton A.
Published: July 2021

The article discusses the procedure for identifying unused agricultural soils for their use in economic circulation. The object of the research is the Belgorod district of the Belgorod Region, Russian Federation. Methods of planned soil inventory form the basis for identifying unused agricultural soil, the main purpose of which is to assess the reasons for land retirement from active economic circulation, cultural and technical state of landholdings and to prepare recommendations for commissioning soils into agricultural circulation. Agriculture is a vast and vital branch of the national economy of the Russian Federation It is necessary to introduce modern technologies, state-of-the-art machinery, investments as well as to put into action several land management measures in order to facilitate the development of this sector of the national economy. The data provided by Earth remote sensing gives the necessary and relevant information to the customers regarding structure, state and detailed characteristics of agricultural soils and other assets of agricultural production; the line-up, state and growth of crops. Earth remote sensing data allows to solve more complex analytical tasks, such as forecasting crop yield and calculating the optimal doses of fertilizers. It is convenient to use Earth remote sensing data for monitoring and analyzing soils. With the assistance of that data, based on satellite images, it is possible to identify not only the types of crops, but also the degree of weediness, state of yield, accurate field boundaries, sown area and so on and so forth. The aim of this project is to perform automated decryption in ScanEx Web Geomixer software.
Influence of the tillage method on the development of leaf diseases of winter wheat
Authors: Kremneva O. Yu. , Gasiyan K. E. , Ponomarev A. V. , Kokhmetova A. , Novoseletsky S. I.
Published: July 2021

To carry out effective plant protection measures, it is necessary to take into account all the factors affecting the quality of the crop. The aim of our research was to study the degree of development of leaf diseases of winter wheat and the rate of infestation of crops, depending on the tillage method. The studies were carried out in 2019-2020 at the experimental plots of “Kuban educational farm” in Krasnodar. For the research, four experimental plots with Steppe variety of soft winter wheat were created, where various soil cultivation systems were applied: 1 - No-Till (zero technology), 2 - moldboard-free technology, 3 - recommended, 4 - moldboard technology. The article presents data on the degree of development of diseases and the degree of infestation of winter wheat plants in the crops of test plots with various tillage systems. It was found that the most preferable is the use of the recommended type of treatment, since with it the least number of diseases develops and the degree of development of pathogens is reduced by 2-3 times in comparison with other options. The influence of the tillage method on the number and composition of phytopathogen spores was revealed.
Immunological variability of rice varieties depending on growing conditions
Authors: Bragina Olesya , Ogly Andrey , Khachmamuk Pshimaf
Published: July 2021

Blast (causative agent Pyriculariaoryzae Cavara) plays an important role among economically important, dangerous and harmful rice diseases of rice in all rice-growing countries, including Russia. The problem of resistance of rice plants to disease is one of the main problems in modern breeding in most countries. Intensification of rice cultivation creates a favorable microclimate in the sowing agrocenosis for the development of blast disease and leads to an increase in its harmfulness. The varieties quickly lose their resistance to new races of the pathogen, due to high spontaneous variability of the M. grisea fungus, its field populations are usually represented by a mixture of races with different virulence and aggressiveness, outstripping the evolution of the host plant. The nature of the blast manifestation depends on the agroclimatic conditions and genotype. The article presents the results of research at experimental and production plots of Federal Scientific Rice Centre (FSC of Rice) and Elite Seed-Production Experimental Statation Krasnaya (ESPES Krasnaya). It has been shown that a clear differentiation of rice varieties in terms of blast resistance and yielding properties is possible only when certain (provocative) conditions are created that contribute to the manifestation of their genetic potential, while the blast resistance of varieties cannot be provided only by the introduction of one gene of racespecific resistance. A close negative relationship was obtained between the yield and the intensity of blast disease on two backgrounds of mineral nutrition: N-1 - r = -0.93; N-2 - r = -0.95. The determination coefficients showed that in 86.8 - 90.1% of cases, the yield is due to the intensity ofblast development on the crops of the studied rice varieties.
Physical and chemical properties of rice grain of variety Rapan at different seeding rates and does of nitrogen fertilizers
Authors: Papulova Elina , Chizhikova Svetlana , Olkhovaya Knarik , Tumanyan Natalia
Published: July 2021

The paper presents the results of evaluating the rice variety Rapan grown in 2018, 2019 at different seeding rates and doses of nitrogen fertilizers, according to the main amylographic characteristics of starch dispersion and fracturing. In 2018 and 2019, when growing variety Rapan with seeding rates of 4, 6 and 8 million viable seeds, the highest values were noted for the “fracturing” trait at a nitrogen dose of 92 kg/ha of active ingredient. In 2018, they amounted to 31, 35 and 41%, respectively, in 2019 - 13, 12 and 12%, respectively. The following tendency in the change of rice quality traits was noted: in the samples grown without the use of nitrogen, low fracturing was revealed, while in the N92 variants the value of the trait was maximum, with N184 - the minimum. Indicators for the “maximum viscosity” at a nitrogen dose of 92 kg / ha of active ingredient had the lowest values at all three seeding rates and amounted to 484, 500 and 485 Br.units in 2018, respectively. In 2019 - 471, 440 and 480 Br. units. The opposite pattern was observed when determining the viscosity indices: at the minimum values of fracturing, the viscosity indices were maximum and decreased at high values of this trait.