bluuebunny/crossref_metadata_2025_split huggingface dataset:
Soil organic matter fractions and carbon distribution under different management in Lesotho, southern Africa
Authors: Mikha Maysoon M. , Marake Makoala V. 
Published: December 2022

AbstractSoil organic matter (SOM) is a complex mixture of multiple fractions of soil organic C (SOC) that can be influenced by management decisions. This study evaluate the effects of tillage (moldboard plow [MP] and no‐tillage [NT]) and commercial fertilizer as limestone ammonium nitrate (28–0–0) at three rates (0 [0‐N], 100 [100‐N], and 200 [200‐N] kg N ha–1) on SOC, soil total N (STN), and SOM fractions (total particulate organic matter‐C [POM‐C] and mineral‐associated organic matter‐C [MAOM‐C]). The study was established in 2008 on the National University of Lesotho Campus Farm, Roma Valley of the Maseru District in Lesotho, southern Africa. The soil classified as Berea series. Soil samples were collected from 0‐to‐5‐, 5‐to‐10‐, 10‐to‐15‐, and 15‐to‐30‐cm depths. Under NT, the SOC, STN, and POM at 0‐to‐15‐cm were 54, 47, and 40% higher than 15‐to‐30‐cm depth, respectively. Differently, 0‐to‐15‐cm the MP had 17, 17, 35% higher SOC, STN, and POM than 15‐to‐30‐cm depth. The SOC in the 0‐to‐15‐cm increased by 27% with MP and by 36% with NT at the 200‐N compared with the 100‐N rate. The highest N‐rate (200‐N) increased total POM by 28.8% for MP and 22.6% for NT than the100‐N rate. The greater increase in POM under MP with high N rate was probably related to the low initial total POM, where small changes in POM will be pronounced, whereas the high total POM in NT could mask the effect the high N rate addition. The coarse and fine POM accounted for 39 and 61%, respectively, of the changes in total POM at both NT and MP. The high percentage of SOC was observed within fine POM fraction (48.4%) in MP, which makes it susceptible to wind erosion, and within MAOM fraction (48.9%) in NT practice. The C/N ratio was highest with coarse POM (C/N ≈ 25) and lowest with MAOM (C/N ≈ 7.2) at both tillage practices. The low C/N ratio made MAOMC vulnerable to microbial decomposition. These findings suggest the need for conservation efforts where conservation tillage and N rates could be used to reduce SOC and POM losses and contribute to improve land sustainability and SOM conservation.
A spreadsheet for determining critical soil test values using the modified arcsine‐log calibration curve
Authors: Bolster Carl H. , Correndo Adrian A. , Pearce Austin W. , Spargo John T. , Slaton Nathan A. , Osmond Deanna L. 
Published: December 2022

AbstractSoil test correlation data are often used to identify a critical soil test value (CSTV), above which crop response to added fertilizer is not expected. Oftentimes, models are used to determine the CSTV from soil test correlation data, yet most commonly used models have inherent assumptions that may not be valid for these data. The arcsine‐log calibration curve (ALCC) was developed in response to the statistical limitations of other commonly used models. A modified ALCC model using standardized major axis regression further improves this model's applicability to soil test correlation data. Here, we describe a Microsoft Excel spreadsheet for calculating CSTV from soil test correlation data using the modified ALCC model. The spreadsheet is available for download providing an accessible and easy‐to‐use tool for those who would like to use this method but who lack the experience with more sophisticated coding programs. The spreadsheet is available for download at http://www.ars.usda.gov/ALCC.
Reaction of 1‐Phenacylidene pyrrolo[3,2,1‐ij]quinolin‐2‐ones with Cyclic/Acyclic Enaminones and the Anticoagulant Activity of Synthesized Pyrrole‐Quinoline Derivatives
Authors: Skoptsova Anna A. , Shestakov Alexander S. , Ledenyova Irina V. , Stolpovskaya Nadezhda V. , Podoplelova Nadezhda A. , Panteleev Mikhail A. , Paponov Boris V. , Sidorenko Oleg E. , Shikhaliev Khidmet S. , Novichikhina Nadezhda P. 
Published: December 2022

AbstractA convenient strategy for the synthesis of pyrroles lineary linked to 4H‐pyrrolo[3,2,1‐ij]quinolin‐2(1H)‐ones is presented. The cyclization of (E)‐1‐(2‐oxo‐2‐phenylethylidene)‐4H‐pyrrolo[3,2,1‐ij]quinolin‐2‐ones with linear and cyclic enaminones proceeds both in the presence of p‐toluenesulfonic acid and triethylamine. The obtained compounds are characterised by atropoisomerism and keto‐enol tautomerism. The synthesized 1‐(2‐phenyl‐1H‐pyrrol‐3‐yl)‐4H‐pyrrolo[3,2,1‐ij]quinolin‐2(1H)‐ones were studied for anticoagulant activity.
Ni nanoparticles Entrapped by a Functional Dendrimer as a Highly Efficient and Recyclable Catalyst for Suzuki‐Miyaura Cross‐Coupling Reactions
Authors: Kuchkina Nina , Sorokina Svetlana , Torozova Alexandra , Bykov Alexey , Shifrina Zinaida 
Published: December 2022

AbstractNi nanoparticles (NiNPs) were prepared by thermal decomposition of nickel acetylacetonate in the presence of a third generation polypyridylphenylene dendrimer (G3) which acts both as a coordinating ligand due to presence of pyridine groups and as a stabilizing agent due to highly branched architecture. Transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), and X‐ray photoelectron spectroscopy (XPS) were used to extensively evaluate structure and morphology of the synthesized NiNPs@G3. The selected area electron diffraction (SAED) allowed us to conclude about fcc structure of NiNPs while STEM EDS analysis demonstrated a formation of core‐shell NiO@Ni NPs. Further, the catalyst was tested in selected Suzuki‐Miyaura cross‐coupling reactions at mild conditions and demonstrated a high efficiency at low Ni loading with negligible content of Ni0 on the NP surface. The functional hyperbranched dendrimer macromolecule provided an excellent stabilization for NiNPs@G3 while allowing an easy access for reactants to catalytic sites. The high activity of the catalyst in the recycling experiments was maintained by the absence of Ni leaching from the NiNPs@G3.
Superb Adsorption of Congo Red by Zn‐Cr Layered Bimetallic Hydroxides Prepared from Electroplated Sludge
Authors: Kong Dehui , Xie Wenyu , Wu Jinxiong , Yan Xiuling , Ivanets Andrei , Zhang Lijuan , Chu Shasha , Yang Bo , Davronbek Bekchanov , Su Xintai 
Published: December 2022

AbstractIt is a challenge to achieve the harmless treatment and resourceful use of various metal elements in electroplating sludge, and converting them into functional materials has become an important technological direction. Based on the existence of various metal ions in electroplating sludge, sodium oleate intercalated Zn−Cr‐LDHs (Zn−Cr‐layered double hydroxides) were prepared by two‐phase solution heating method. The adsorption process of the prepared LDHs for Congo red (CR) in aqueous solution can be described by Langmuir isotherm model and pseudo‐second‐order kinetic model and the maximum adsorption capacity is 2750.43 mg/g. The results of TEM and XPS show that the adsorption mechanism is dominated by electrostatic adsorption, ion exchange process, hydrogen bonding interaction and surface complexation. Therefore, this paper provides a strategy for recovering metal elements from electroplating sludge to prepare LDHs adsorption materials with ultra‐high adsorption capacity.
A Non‐Enzymatic and Electrochemical‐Based Sensor using a Prussian Blue‐Gold Nanoparticle‐Reduced Graphene Oxide Ternary Nanocomposite for Efficient Hydrogen Peroxide Detection.
Authors: Chauhan Seema , Sharma Chhaya 
Published: December 2022

AbstractAn electrochemical sensor has been developed using PBNCs/AuNPs/RGO ternary nanocomposite, in which gold nanoparticles (AuNPs) are deposited on Prussian blue nanocubes (PBNCs) and reduced graphene oxide (RGO) using two‐step in‐situ synthetic approach. The synthesized ternary nanocomposite shows high catalytic activity towards H2O2 sensing due to the synergistic effect of gold nanoparticles and RGO. The material was prepared by the co‐precipitation method, and the morphology of the synthesized composites was characterized using X‐Ray diffraction (XRD), scanning electron microscopy (SEM), and High‐resolution Transmission electron microscopy (HR‐TEM). Electrochemical measurements were performed by modifying glassy carbon electrodes (GCE) with bare PBNCs, PBNCs/RGO, and PBNCs/AuNPs/RGO for low‐level detection of H2O2 using Cyclic Voltammetry (CV) and Chronoamperometry. The interference property was analyzed using ascorbic acid (AA), uric acid (UA), and glucose as interfering agents. The modified electrode shows high sensitivity of 5.47 nA/nM and a limit of detection of 260 pM for H2O2 at (S/N=3). This electrochemical sensor observed a linear range of detection from 0.66 nM to 10.53 nM. The proposed sensor exhibits good stability, better selectivity, and a picomolar concentration detection limit for H2O2.
Coumarin Hydrazone Oxime Scaffolds as Potent Anti‐tubercular Agents: Synthesis, X‐ray crystal and Molecular Docking Studies
Authors: Akki Mahesh , Reddy Dinesh S. , Katagi Kariyappa S. , Kumar Amit , Devarajegowda Hirihalli C. , Kumari M Sunitha , Babagond Vardhaman , Joshi Shrinivas D. 
Published: December 2022

AbstractA series of new Coumarin hydrazone oxime scaffolds were synthesised as potential anti‐TB agents. The structures of the scaffolds were confirmed by spectroscopic and analytical techniques. X‐ray crystallography confirmed the structure of compound6‐methyl‐4‐((((Z)‐((E)‐3‐(2‐phenylhydrazono)butan‐2‐ylidene)amino)oxy)methyl)‐2H‐chromen‐2‐one(5a). The coumarin hydrazone oxime scaffolds were testedin‐vitroagainst theMycobacterium tuberculosisH37Rv strain, and Vero cells were used to assess cytotoxicity. Compound5bwas obtained as the hit candidate, exhibiting MIC 0.78 μg/mL, showing more potent anti‐TB activity than Rifamycin and comparable activity to Isoniazid. There was minimal cytotoxicity observed against Vero cells for the most active compounds, indicating a good safety‐profile.In addition, the most diligent compound5bdemonstrated substantial binding interactions at the PDB:4DQU enzyme's active site and also displayed greater C‐score value than that of 4DQU ligand which validates the observed results.
Synthesis and Characterizations of Core‐Shell Hybrids of Poly(ortho‐phenylenediamine) Functionalized with Uniformly Distributed Silver Nanoparticles
Authors: Chourasia Moon , Sahoo Devleena , Priya Leena , Kundu Sadhana , Bage Nirgaman , Kar Pradip 
Published: December 2022

AbstractA single‐step process has been demonstrated for the synthesis of core‐shell hybrid of poly(o‐phenylenediamine) functionalized with uniformly distributed silver nanoparticles. The silver nanoparticles as core were formed by the thermal reduction of the amine complexes of silver mono‐positive cation. The interfacial functionalization of silver nanoparticles by the =NH was characterized using Fourier transform infrared spectroscopy and ultraviolet‐visible spectroscopy. The uniform size of particles in core‐shell hybrid and the amount of metal nanoparticle ingrained in polymer matrix were confirmed from the characterizations, viz., dynamic light scattering, inductively coupled plasma‐optical emission spectrometry and field‐emission scanning electron microscopy. The hybrid with ∼12 % silver loading was found to have the highest DC‐conductivity of 10−4 S cm−1 range, even without the usage of any other dopant. The induced doping of silver nanoparticles through the functional groups of the polymer was considered to explain the conducting properties of the prepared core‐shell hybrid.
DABCOnium Ionic Liquid‐Immobilized Silica Gel for Solid Phase Extraction of Phenoxyacetic Acid Herbicides in Water Samples**
Authors: Nguyen The Thai , Nguyen Thinh Phuc , Tran Long Nam , Huynh Tam Thanh Thi , Nguyen Nhi Hoang , Nguyen Linh Ho Thuy , Le Tien Thi My , Doan Tan Le Hoang , Nguyen Mai Anh , Tran Phuong Hoang 
Published: December 2022

AbstractA novel sorbent (SiO2‐(CH2)3‐DABCO) for solid‐phase extraction (SPE) was successfully prepared by chemical‐bonding formation of diazabicyclo[2.2.2]octane ionic liquid onto silica gel. The structure of SiO2‐(CH2)3‐DABCO sorbent was characterized by FT‐IR, TGA, SEM, EDX, and BET methods. Cartridges packed with the synthetic SiO2‐(CH2)3‐DABCO were used for the preconcentration of trace‐level of phenoxyacetic acid herbicides in water samples for the first time. The factors influencing on the recovery were investigated, such as type of ion liquids, loading volume, eluents, elution volume, loading rate, and capacity. After the enrichment, the phenoxyacetic acid herbicides were analyzed by high‐performance liquid chromatography with an ultraviolet detector. Four model phenoxyacetic acid herbicides, including 2‐methyl‐4‐chlorophenoxyacetic acid (MCPA), 2,4,5‐trichlorophenoxyacetic acid (2,4,5‐T), fenoprop (2,4,5‐TP) and haloxyfop were well retained and separated by this material with a recovery efficiency from 77 to 103 %. The SiO2‐(CH2)3‐DABCO demonstrated a good capacity corresponding to 0.56 mg of the analyte adsorbed per 100 mg of the material. The mixture of phosphate buffer (pH 7) : MeOH (50 : 50, v/v) was used to elute the analytes and provided the highest recovery with the standard deviations from 2.4 to 6.5. The high sensitivity with detection limits of 1.070–9.587 μg/L can be achieved.
Rapid and Visual Detection of Al3+ Based on Supramolecular Self‐Assembly of a Water‐Soluble Perylene Diimide Derivative
Authors: Shi Mei , Jiang Jinghan , Gao Xiao , Li Yining , Xiao Keren , Han Qi‐an , Kong Weifu , Liu Qingliang , Yao Zhiyi 
Published: December 2022

AbstractAluminum (Al) is widely used in food industry, but excessive absorption of Al3+ causes many serious health problems. Therefore, it is of great significance to determine the specificity of Al3+. In this study, we designed and synthesized a water‐soluble perylene diimide derivative (PDI‐Phe) for monitoring Al3+ rapidly and visually. Through absorption and emission spectroscopy techniques, we systematically explored the properties and mechanism of the sensor to Al3+. The limit of detection (LOD) of Al3+ was as low as 6.54 nM. And with the existence of Al3+, electrostatic interaction and intermolecular π‐π stacking promoted the aggregation and fluorescence quenching of PDI‐Phe. Even in the presence of other analytes, PDI‐Phe still had excellent selectivity and sensitivity for Al3+ detection. Besides, it also had the characteristics of low cost, good water solubility, excellent chemical and optical stability, and easy synthesis. Finally, this method can be further applied to tap water samples.
Investigation of Secondary Metabolites from Marine‐Derived FungiAspergillus
Authors: Tilvi Supriya , Parvatkar Rajesh , Awashank Avinash , Khan Safia 
Published: December 2022

AbstractMarine fungiAspergillus flavipesandA. terreuswere investigated for secondary metabolites using electrospray ionization‐quadrupole time‐of‐flight mass spectrometry (ESI‐QTOF MS) analysis. The ESI‐MS analysis showed thatA. flavipesshowed molecular ion peaks for compounds, terrein(1), butyrolactone I(2), butyrolactone I‐carboxylic acid(3), butyrolactone III(4), while,A. terreushad additional presence of new compound aspernolide Q(5)with absence of compound(3). By using tandem mass spectrometry data, the prominent fragment ions helped in the establishing the structure of compounds(2‐5). Further, chemical transformation of butyrolactone I to butyrolactone III and aspernolide Q were carried out followed by NMR analysis which strongly suggested their structures. The evaluation of salt stress experiment ofA. terreusculture medium affected the production of major bioactive metabolites, terrein and butyrolactone I(2). The HPLC analysis showed that culture produces high amount of terrein at 35 ‰, while, maximum production of butyrolactone I was observed in fresh water i. e. 0‰. The study highlighted an importance of salinity in producing these metabolites where, terrein and butyrolactone I could be produced in equal ratio at 18‰. Importantly, we have demonstrated that using this fungal strain and by growing in medium at specific salinity could be way forward for commercial production of these bioactive compounds.
Contrasting the Noncovalent Interactions of Aromatic Sulfonyl Fluoride and Sulfonyl Chloride Motifs via Crystallography and Hirshfeld Surfaces
Authors: Bellia Sophia , Teodoro Lara I. , Barbosa Antonio J. , Zeller Matthias , Mirjafari Arsalan , Hillesheim Patrick C. 
Published: December 2022

AbstractA heteroaryl sulfonyl(VI) fluoride, 4‐chloro‐7‐fluorosulfonyl‐2,1,3‐benzoxadiazole, was synthesized from its chloride counterpart (4‐chloro‐7‐chlorosulfonyl‐2,1,3‐benzoxadiazole) and the X‐ray structure analysis of these compounds and the interactions in the solid‐state were thoroughly examined. Hirshfeld surface analysis is used to provide a thorough and complete picture of the changes arising from the different halides in the functional groups. Surface analysis reveals that the fluoride does not participate in any hydrogen interactions as opposed to the chloride. However, the fluorine atom is observed to form close interactions with several π bonds. For both moieties, however, the sulfonyl oxygens show comparable interactions with respect to both magnitude and interatomic distances. The Hirshfeld surface analysis is coupled with computational studies to help elucidate the observed interactions that are found from the distinct nitrogen, chlorine, and oxygen atoms present in the molecules, providing new physical insights to the correlation between their structures and properties
Phytochemical Profiling, Biological Activities and In Silico Virtual Screening of Bioactive Compounds ofTrichodesma Indicum(L) R. Br. Extracts
Authors: Mazhar Modasrah , Afzal Muhammad , Naveed Muhammad 
Published: December 2022

AbstractThe current study was designed to evaluate the biological potential of bioactive compounds in the selected fractions ofTrichodesma indicum. The results showed that the chloroform and ethyl acetate fractions of ethanolic extract of the whole plantT. indicumwere rich in TPCs (total phenolic content) i.e 499.80 and 744.65 mg of gallic acid equivalents per g, respectively, while TFCs (total flavonoid content) were 42.48, and 55.02 mg of catechin equivalents per g, respectively. HPLC analysis confirmed the presence of phenolics i. e., chlorogenic acid (252.35 ppm), ferulic acid (92.56 ppm), caffeic acid (28.72 ppm), cinnamic acid (28.97 ppm), syringic acid (23.75 ppm), gallic acid (7.28 ppm) and flavonoids i. e. myricetin (72.1 ppm), Quercetin (57.3 ppm) in a selected fraction ofT. indicumethanolic extract. The significant potential of antioxidants was observed through ABTS, DPPH, and H2O2 methods. The highest % inhibition of inflammation was observed in ethyl acetate fraction by performing in‐vitro and in‐vivo assays, 87.57 % and 79.18 % (P<0.05) respectively. The thrombolytic activity of theT. indicumfractions was observed in the range from 9.85 % to 27.26. GC‐MS coupled with molecular docking depicted the inhibition of COX‐1 and COX‐2 by the GC‐MS‐identified compound 9,19‐Cyclolanost‐24‐en‐3‐ol, (3. Beta.)‐ (−9.6 kJ/mol). The in‐silico anti‐proliferative analysis was conducted by using BRCA1 and BRCA2 cancerous protein against GC‐MS identified compounds among which stigmasterol (−8.0 kJ/mol) was observed for high binding affinity.
Removal of Toxic Dyes and Paraquat by a Dual‐Functional Metal‐Organic Framework
Authors: Sun Hai‐Yan , Gao Yu‐Jie , Li Ji‐Long , Zou Yan‐Min , Feng Mei‐Ling , Huang Xiao‐Ying 
Published: December 2022

AbstractEnvironmental contamination due to organic pollutants including organic dyes (e. g., methylene blue (MB)) and paraquat (i. e., methyl viologen (MV)) has become a serious problem. Herein, the removal for toxic cations of methylene blue (MB+) and methyl viologen (MV2+) has been realized by a three‐dimensional (3D) anionic microporous metal‐organic framework, namely [Me2NH2][In(TDC)2] ⋅ 1.5DMA ⋅ H2O (FJSM‐InMOF). FJSM‐InMOF is capable of selectively adsorbing MB+ in the presence of various dyes due to the effects of size‐exclusion and charge‐matching. Particularly, the strategy of combining adsorption and photocatalytic degradation realizes the thorough treatment of MB+, which has been rarely reported. The adsorbent material can be easily regenerated and reused. Moreover, FJSM‐InMOF exhibits a high capacity and rapid kinetics towards more toxic MV2+. This work poses a new way for the selective removal of cationic organic pollutants and highlights the significance of combining different methods for the decontamination of organic pollutants.
Photochemical Synthesis of Tetrahydro‐6H‐cyclopenta[b]furan‐6‐ones from Substituted Allomaltols
Authors: Milyutin Constantine V. , Galimova Renata G. , Komogortsev Andrey N. , Lichitsky Boris V. , Migulin Vasily A. , Melekhina Valeriya G. 
Published: December 2022

AbstractA novel UV‐mediated approach for the synthesis of previously unknown 3a,6a‐dihydroxy‐4‐methyl‐2,3,3a,6a‐tetrahydro‐6H‐cyclopenta[b]furan‐6‐one derivatives from easily accessible substituted allomaltols containing a 2‐aryl‐2‐hydroxyethyl fragment was elaborated. The suggested method is based on the ESIPT‐promoted contraction of a 3‐hydroxy‐4‐pyranone moiety followed by intramolecular trapping of a photogenerated α‐hydroxy‐1,2‐diketone intermediate. For the first time, we have demonstrated that a side chain hydroxyl group can be employed for the concluding cyclization with a labile α‐hydroxy‐1,2‐diketone fragment. The structure of one synthesized photoproduct was determined by X‐ray diffraction.
Selenium Dioxide as a Source to make Se‐Containing Imidazoheterocycle or Aniline Derivatives
Authors: Zhong Zijian , Ma Jinfeng , Xu Pan , Zhou Aihua 
Published: December 2022

AbstractSelenium dioxide is traditionally regarded as an oxidant and rather as a selenium source for making organseliums. Herein, we developed a new selenation method by using selenium dioxide instead of commonly used selenium powder or diselenides to generate Se‐substituted imidazoheterocycle and aniline compounds. Furthermore, sodium arenesulfinates were selected as coupling partners instead of traditional aromatic halides. All reactions give desired products in moderate to excellent yields under mild conditions.
Untersuchungen zur Grenzvorspannkraft von hochfesten Schraubengarnituren
Authors: Reinheimer Jan , Lange Jörg 
Published: December 2022

AbstractIn DIN EN 1090‐2 ist für vorgespannte Schraubverbindungen eine nachträgliche Kontrolle der Montage vorgeschrieben – so sind vorgespannte Schrauben u. a. auf Überanziehen zu überprüfen. Wird eine Schraube als zu hoch vorgespannt eingestuft, kann dies dazu führen, dass die gesamte Schraubengruppe ausgetauscht werden muss. Neben den hohen Kosten für den Austausch bedeutet dies oft, dass weitere Arbeiten vorübergehend gestoppt werden müssen. Es fehlt jedoch an wissenschaftlichen Erkenntnissen über die tatsächliche Auslastung der als überdreht klassifizierten Schraube. Um Garnituren hinsichtlich einer zu hohen Vorspannung zu beurteilen, definiert DIN EN 1090‐2 für das kombinierte Verfahren eine maximale Überschreitung des vorgegebenen Weiterdrehwinkels. Durch experimentelle Untersuchungen an HV‐Schrauben der Durchmesser M16 und M20 mit unterschiedlichen Längen konnte gezeigt werden, dass überelastische Vorspannkräfte erst ab Einschnürungsbeginn einen signifikanten Einfluss auf das Tragverhalten haben. Die Bewertung vorgespannter Schrauben hinsichtlich eines Überanziehens, wie sie in DIN EN 1090‐2 angegeben wird, scheint zu pauschal und für die bisher untersuchten Schraubendurchmesser und ‐längen zu konservativ zu sein.