bluuebunny/crossref_metadata_2025_split huggingface dataset:
Rheology, curing and time‐dependent behavior of epoxy/carbon nanoparticles systems
Authors: Bianchi Otávio , Cruz Joziel A. , Paim Lucas , Lavoratti Alessandra , Al‐Maqdasi Zainab , Amico Sandro C. , Fernberg Patrik , Joffe Roberts 
Published: October 2023

AbstractThis study delved into the characterization of epoxy nanocomposites containing diglycidyl ether of bisphenol‐A (DGBEA), graphene nanoplates (GN), and carbon nanotubes (CNT) across a range of weight percentages (0.05% to 2%). The nanocomposites were produced through a process involving mechanical stirring and ultrasonication. To assess compatibility, three‐dimensional solubility parameters (3DSP) were employed. CNT demonstrated superior compatibility with epoxy and triethylenetetramine (TETA), due to its higher amount of oxygenated species in nanoparticle surface compared to GN. A rheological percolation phenomenon occurred in CNT systems at concentrations above 0.2%, while GN did not display percolation even at 2% concentration. Incorporating nanoparticles led to increased curing enthalpy due to surface functional groups. As the percolation network formed, viscosity rose, and a reduced glass transition temperature (Tg) indicated restricted molecular mobility. Surprisingly, Tg consistently increased by approximately 27°C during composite annealing, regardless of nanoparticle type or concentration. This was attributed to forming a three‐dimensional network structure potentially originating from reactions between nanoparticle‐oxygenated groups and the epoxy matrix. This phenomenon was crucial in heightened creep and irreversible deformations, setting these nanocomposites apart from pure resin behavior.
Super porous α‐, β‐, γ‐cyclodextrin cryogels with high active agent loading and controllable release profiles
Authors: Yilmaz Aynur S. , Sahiner Nurettin 
Published: October 2023

AbstractCyclodextrins (CDs) are truncated cone‐like structures that are natural cyclic oligosaccharides. Here, a simple preparation method for super porous poly(α‐CD), poly(β‐CD), and poly(γ‐CD) cryogels crosslinking with divinyl sulfone at 150%, 100% and 125% mole ratios with respect to the α‐CD, β‐CD, and γ‐CD molecules, respectively, under cryogenic conditions, is reported. The interconnected homogeneous pore distribution of CD‐based cryogels with pore sizes in the range of 5–100 μm is confirmed by SEM analysis. The CD‐based cryogels weighing 10 mg are determined as hemocompatible with <1% hemolysis ratios and >79% blood clotting indexes; whereas the same materials weighing 1 mg are biocompatible with >75% cell viability on L929 fibroblasts. Additionally, active agent adsorption/delivery efficiencies of CD‐based cryogels utilizing two active agents, Bisphenol A (BPA, a carcinogenic compound) and Curcumin (CUR, a polyphenolic compound), are individually evaluated. It was revealed that p(γ‐CD) cryogels exhibited the highest active agent loading capacity for BPA, 87 ± 13 mg/g, whereas p(α‐CD) cryogels showed the highest loading capacity for CUR, 136 ± 4 mg/g. Moreover, the active agent release from p(α‐CD), p(β‐CD), and p(γ‐CD) cryogel networks at pH 7.4 and 37°C were determined as 40.6 ± 2, 35.3 ± 2, and 34 ± 1 mg/g for BPA, and 1.07 ± 0.2, 1.27 ± 0.1, and 1.37 ± 0.1 mg/g for CUR, respectively, within 96 h.
Vinylhydridosilsesquioxne: Synthesis and characterization of a potential filler material for vinyl‐containing polysiloxanes
Authors: Yesudas Saino , Sreejith K. J. , Vijay V. Vipin 
Published: October 2023

AbstractThis paper reports the synthesis and characterization of an organic silsesquioxane (SQ) containing Sivinyl and SiH groups named as vinylhydridosilsesquioxane (SQVH‐12). Detailed investigation of the structure of this organosilsesquioxane revealed that SQVH‐12 has a highly cross‐linked (polycyclic) SiO network of silsesquioxane with Sivinyl and SiH functional groups. Thermogravimetric analysis of the pyrolysis behavior of SQVH‐12 yielded a high percentage of ceramic residue (~92%) at 1200°C under an argon atmosphere. The presence of functional groups in SQVH‐12 and the high rate of ceramic residue highlights the potential usefulness of SQVH‐12 as a filler for vinyl‐containing polysiloxanes. Thus, further research of SQVH‐12 can find applications in a wide variety of areas such as additive manufacturing, protective coatings, and advanced composites.
Purification and characterization of thioredoxin reductase enzyme from commercial Spirulina platensis tablets by affinity chromatography and investigation of the effects of some chemicals and drugs on enzyme activity
Authors: Dagsuyu Eda , Yanardag Refiye 
Published: October 2023

AbstractThioredoxin reductase (TrxR, enzyme code [E.C.] 1.6.4.5) is a widely distributed flavoenzyme that catalyzes nicotinamide adenine dinucleotide phosphate (NADPH)‐dependent reduction of thioredoxin and many other physiologically important substrates. Spirulina platensis is a blue–green algae that is often used as a dietary supplement. S. platensis is rich in protein, lipid, polysaccharide, pigment, carotenoid, enzyme, vitamins and many other chemicals and exhibits a variety of pharmacological functions. In the present study, a simple and efficient method to purify TrxR from S. platensis tablets is reported. The extractions were carried out using two different methods: heat denaturation and 2′,5′‐adenosine diphosphate Sepharose 4B affinity chromatography. The enzyme was purified by 415.04‐fold over the crude extract, with a 19% yield, and specific activity of 0.7640 U/mg protein. Optimum pH, temperature and ionic strength of the enzyme activity, as well as the Michaelis constant (Km) and maximum velocity of enzyme (Vmax) values for NADPH and 5,5′‐dithiobis(2‐nitrobenzoic acid) were determined. Tested metal ions, vitamins, and drugs showed inhibition effects, except Se4+ ion, cefazolin sodium, teicoplanin, and tobramycin that increased the enzyme activity in vitro. Ag+, Cu2+, Mg2+, Ni2+, Pb2+, Zn2+, Al3+, Cr3+, Fe3+, and V4+ ions; vitamin B3, vitamin B6, vitamin C, and vitamin U and aciclovir, azithromycin, benzyladenine, ceftriaxone sodium, clarithromycin, diclofenac, gibberellic acid, glurenorm, indole‐3‐butyric acid, ketorolac, metformin, mupirocin, mupirocin calcium, paracetamol, and tenofovir had inhibitory effects on TrxR. Ag+ exhibited stronger inhibition than 1‐chloro‐2,4‐dinitrobenzene (a positive control).
UHPFRC‐Fertigteilsegmente für einen nachhaltigen und ressourcenschonenden Betonbrückenbau
Authors: Wilkening Marvin , Schack Tobias , Haist Michael , Oettel Vincent 
Published: October 2023

AbstractViele der gegenwärtig in Deutschland genutzten Betonbrücken weisen alters‐ bzw. bauartbedingt einen defizitären Zustand auf. Zudem tragen auch gestiegene Verkehrsbeanspruchungen dazu bei, dass viele der Brücken mittelfristig ersetzt werden müssen. Aufgrund der vielen Vorteile von Betonkonstruktionen ist davon auszugehen, dass auch in Zukunft Betonbrücken geplant und ausgeführt werden. Angesichts der zunehmenden Folgen des Klimawandels und der zwingenden Notwendigkeit, die CO2‐Emissionen auch im Bauwesen zu reduzieren, herrscht dringender Forschungsbedarf an klima‐ und ressourcenschonenden, nachhaltigen, aber auch wirtschaftlichen Betonbauweisen. Ein vielversprechender Ansatz, um schnell, effektiv und ressourcenoptimiert sowie CO2‐effizient zu bauen, ist der Einsatz von Hochleistungsmaterialien wie z. B. ultrahochfestem Faserbeton (UHPFRC) in Kombination mit der Fertigteilsegmentbauweise. Im vorliegenden Beitrag wird ausgehend von einer monolithischen Hohlkastenbrücke aus normalfestem Beton mithilfe von numerischen Berechnungen untersucht, wie viel Material bei segmentierten Hohlkastenbrücken unter Variation der Betondruckfestigkeit (normal‐, hoch‐ und ultrahochfest) eingespart werden kann. Die auf dieser Grundlage anschließend durchgeführte Ökobilanzierung für die Lebenszyklusphasen A1–A3 zeigt, dass bei voller Ausnutzung des Materials der Einsatz von UHPFRC im Vergleich zu normal‐ und hochfesten Betonen zu sehr ressourcenschonenden und nachhaltigen Konstruktionen führt.
Cleaving Folded RNA with DNAzyme Agents
Authors: Nedorezova Daria D. , Dubovichenko Mikhail V. , Kalnin Arseniy J. , Nour Moustapha A. Y. , Eldeeb Ahmed A. , Ashmarova Anna I. , Kurbanov Gabdulla F. , Kolpashchikov Dmitry M. 
Published: October 2023

AbstractCleavage of biological mRNA by DNAzymes (Dz) has been proposed as a variation of oligonucleotide gene therapy (OGT). The design of Dz‐based OGT agents includes computational prediction of two RNA‐binding arms with low affinity (melting temperatures (Tm) close to the reaction temperature of 37 °C) to avoid product inhibition and maintain high specificity. However, RNA cleavage might be limited by the RNA binding step especially if the RNA is folded in secondary structures. This calls for the need for two high‐affinity RNA‐binding arms. In this study, we optimized 10–23 Dz‐based OGT agents for cleavage of three RNA targets with different folding energies under multiple turnover conditions in 2 mM Mg2+ at 37 °C. Unexpectedly, one optimized Dz had each RNA‐binding arm with a Tm ≥60 °C, without suffering from product inhibition or low selectivity. This phenomenon was explained by the folding of the RNA cleavage products into stable secondary structures. This result suggests that Dz with long (high affinity) RNA‐binding arms should not be excluded from the candidate pool for OGT agents. Rather, analysis of the cleavage products’ folding should be included in Dz selection algorithms. The Dz optimization workflow should include testing with folded rather than linear RNA substrates.
Two‐step hybrid modeling for variable selection and estimation: An application to quantitative structure activity relationship study
Authors: Oranye Henrietta Ebele , Ugwuowo Fidelis Ifeanyi , Arum Kingsley Chinedu 
Published: October 2023

AbstractIn this study, we developed a simple technique for effective parameter estimation and prediction of the quantitative structure activity relationship studies using a two‐step procedure. The first step is to choose the important molecular descriptors using the random forest regression, and the second step is to optimally predict the biological activity of the selected chemical compounds using the following estimators: ridge regression, jackknife ridge, Liu regression, jackknife Liu, Kibria–Lukman, and jackknife Kibria–Lukman. We conducted a simulation study and a real‐life analysis with a quantitative structure–activity relationship (QSAR) data with 2540 descriptors after preprocessing. The optimal prediction is determined using the cross‐validation error. The estimator with minimum cross‐validation error is considered best. It is obvious that performing jackknife estimation after random forest selection is preferred.
Straightforward Synthesis of Pentagon‐Embedded Expanded [11]Helicenes for Radiative Cooling Property
Authors: Ji Bingliang , Qi Zewei , Ye Tongtong , Li Shuangxuan , Shi Yanwei , Cui Shuang , Xiao Jinchong 
Published: October 2023

AbstractTwo new pentagon‐embedded carbo[11]helicenes have been designed and synthesized in a three‐step process, which are the first example of carbo[11]helicenes through the post‐functionalization of twistacene. TD‐DFT analyses indicate that both of them possess high enantiomerization barriers of 42.29 kcal/mol and 40.76 kcal/mol, respectively. They emit strong red fluorescence and can be chemically oxidized into stable cationic radicals upon addition of AgSbF6 evidenced by the bathochromic‐shifted absorption spectra and the appearance of electronic paramagnetic resonance (EPR) signals. In addition, such helical derivatives can be chosen as radiative cooling materials in a glass model house, and the maxima of 5.4 °C for the former and 6.5 °C for the latter are found in the comparative tests, which might be caused by the NIR reflective response.
Selective Perchlorate Sensing Using Electrochemical Impedance Spectroscopy with Self‐Assembled Monolayers of semiaza‐Bambusurils
Authors: Khurana Raman , Alami Fuad , Nijhuis Christian A. , Keinan Ehud , Huskens Jurriaan , Reany Ofer 
Published: October 2023

AbstractIn the last two decades, perchlorate salts have been identified as environmental pollutants and recognized as potential substances affecting human health. We describe self‐assembled monolayers (SAMs) of novel semiaza‐bambus[6]urils (semiaza‐BUs) equipped with thioethers or disulfide (dithiolane) functionalities as surface‐anchoring groups on gold electrodes. Cyclic voltammetry (CV) with Fe(CN)63−/4− as a redox probe, together with X‐ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and ellipsometry, were employed to characterize the interactions at the interface between the anchoring groups and the metal substrate. Data showed that the anion receptors′ packing on the gold strongly depends on the anchoring group. As a result, SAMs of BUs with lipoic amide side chains show a concentration‐dependent layer thickness. The BU SAMs are extremely stable on repeated electrochemical potential scans and can selectively recognize perchlorate anions. Our electrochemical impedance spectroscopy (EIS) studies indicated that semiaza‐BU equipped with the lipoic amide side chains binds perchlorate (2–100 mM) preferentially over other anions such as F−, Cl−, I−, AcO−, H2PO4−, HPO42−, SO42−, NO2−, NO3−, or CO32−. The resistance performance is 10 to 100 times more efficient than SAMs containing all other tested anions.
Supercapacitors vs. Lithium‐ion Batteries: Properties and Applications
Authors: Libich Jiri , Sedlaříková Marie , Máca Josef , Čudek Pavel , Kazda Tomas , Fafilek Guenter , Rodríguez Juan José Santana 
Published: October 2023

AbstractSupercapacitors attract attention due to their superior values in the parameters like capacitance, discharge currents and cycle lifespan. Supercapacitors are designed and used in many applications where they partially or completely substitute conventional batteries. On the other side, supercapacitors are used in applications which are not so far suitable for these devices. To avoid wrong design and misuse of the supercapacitors it is necessary to correctly understand their properties, key advantages and disadvantages. Similar situation can be found in the field of lithium‐ion batteries.
Epitaxial Growth of Li2O2 Achieved by a Rational Designed Fe3O4@N‐doped Carbon Nanoflower Structure for Improving the Performance of Li−O2 Batteries
Authors: Ma Shiyu , Lou Anqi , Yao Kun , Geng Wenchao , Li Zhongjun , Liu Qingchao 
Published: October 2023

AbstractThe insulated and insoluble discharge product Li2O2 can cause excessive charge overpotential, eventually leading to the deactivation of the Li−O2 battery. Here, a nanoflower structure (Fe3O4@NC) fabricated by coating Fe3O4 with N‐doped carbon was used as an effective catalyst for Li−O2 cathode. The N‐doped defective carbon layer provides sufficient active sites for the formation of discharge intermediates and exhibits a coating effect on Fe3O4, thereby facilitating the maintenance of structural stability. The hierarchical structure of Fe3O4 can effectively mitigate the agglomeration of the carbon layer, thus promoting a homogeneous distribution and optimal utilization of active sites on the carbon layer. As a result, the synergistic effect of Fe3O4 combined with the N‐doped carbon layer enhances the Li+/e− transfer rate and effectively accelerates the kinetic of oxygen reduction/evolution reaction (ORR/OER). Furthermore, the unique functionality of Fe3O4@NC induces the epitaxial growth of Li2O2 into uniform nanosheets, thereby increasing the utilization of cathode space and ultimately promoting the energy release of Li−O2 batteries. The Li−O2 battery with Fe3O4@NC cathode exhibits remarkable full discharge capacity of 16495 mAh g−1 and significantly improved round‐trip performances for 120 cycles at a cutoff capacity of 1000 mAh g−1 with a current density of 200 mA g−1.
MAPK/ERK and PI3K/AKT signaling pathways are activated in adolescent and adult acute lymphoblastic leukemia
Authors: Loureiro Gustavo , Bahia Daniella M. , Lee Maria Lucia M. , de Souza Mair Pedro , Kimura Eliza Y. S. , Rezende Denise Carvalho , Silva Marçal Cavalcante de Andrade , Chauffaille Maria de Lourdes L. F. , Yamamoto Mihoko 
Published: October 2023

AbstractBackground: The mitogen‐activated protein kinase (MAPK)/ERK signaling cascade and the phosphoinosytol‐3 phosphate/Akt (PI3K/Akt) pathways are involved in proliferation and differentiation of hematopoietic cells. The frequency of PI3K/Akt and MAPK pathway activation in adult acute lymphoblastic leukemia (ALL) still need to be elucidated.Aims: To assess the activity and prognostic implications of MAPK/ERK and PI3K/Akt pathways in adult (ALL).MethodsWe examined 28 precursor‐B‐cell ALL and 6 T‐cell primary ALL samples. Flow cytometry was employed to analyze the expression levels of phosphorylated ERK and phosphorylated Akt.ResultsTen out of 15 (67%) ALL fresh samples (7 B‐cell, 3 T‐cell) showed constitutive p‐ERK expression. The p‐ERK mean fluorescent index ratio (MFI (R)) showed a tendency to be higher in ALL than in normal T lymphocytes (1.26 [0.74–3.10] vs. 1.08 [1.02–1.21], respectively [p = .069]) and was significantly lower than in leukemic cell lines (median MFI (R) 3.83 [3.71–5.97] [p < .001]). Expression of p‐Akt was found in 35% (12/34) (10 B‐cell, 2 T‐cell). The median MFI (R) expression for p‐Akt in primary blast cell was 1.13 (0.48–9.90) compared to 1.01 (1.00–1.20) in normal T lymphocytes (p = ns) and lower than in leukemic cell lines (median MFI (R) 2.10 [1.77–3.40] [p = .037]). Moreover, expression of p‐ERK was negatively associated with the expression of CD34 (1.22 [0.74–1.33] vs. 1.52 [1.15–3.10] for CD34(+) and CD34(−) group, respectively, p = .009).ConclusionOur findings suggest that both MAPK/ERK and PI3K/Akt are constitutively activated in adult ALL, indicating a targeted therapy potential for ALL by using inhibitors of these pathways.
Can good ESG performance reduce stock price crash risk? Evidence from Chinese listed companies
Authors: Luo Wenbing , Tian Ziyan , Fang Xusheng , Deng Mingjun 
Published: October 2023

AbstractAgainst the backdrop of growing worldwide attention towards environmental, social, and governance (ESG) considerations, this study investigates how ESG performance affects the probability of stock price crashes. The research explores samples of Chinese A‐share listed companies during the period from 2010 to 2019. The outcomes indicate that commendable ESG performance lowers the likelihood of stock price crashes, and these results persist robust even after executing a series of robustness and endogeneity examinations. Moreover, the available evidence indicates that good ESG performance mitigates the risk of stock price crashes by curbing both earnings management and corporate risk. However, the positive influence of good ESG performance on reducing the risk of stock price crashes diminishes when analyst coverage increases. Furthermore, the heterogeneity analysis infers that the effect of good ESG performance in reducing stock price crash risk is more significant for non‐state companies. Heightened economic policy uncertainty weakens the effect of good corporate ESG performance in mitigating stock price crash risk. Of the three ESG performance dimensions—environmental, social, and corporate governance—the latter is the most effective in lessening such risks. This research carries notable implications for reinforcing the ESG disclosure arrangement in China and other developing economies. It also guides government institutions and regulators in the creation of policies that foster high‐calibre economic progress.
Impact of Temperature an Order of Magnitude Larger Than Electrical Potential in Lignin Electrolysis with Nickel
Authors: Carkner Andrew , Tageldin Ingy , Han Jiashuai , Seifitokaldani Ali , Kopyscinski Jan 
Published: October 2023

AbstractLignin, a major component of plant biomass, is a promising sustainable alternative carbon‐based feedstock to petroleum as a source of valuable aromatic compounds such as vanillin. However, lignin upgrading reactions are poorly understood due to its complex and variable molecular structure. This work focuses on electrocatalytic lignin upgrading, which is efficient and sustainable at moderate temperatures and pressures and does not require stoichiometric reagents. We used a meta‐analysis of published lignin conversion and product yield data to define the operating range, to select the catalyst, and then performed electrocatalytic experiments. We quantified the impact of temperature and electrical potential on the formation rate of valuable products (vanillic acid, acetovanillone, guaiacol, vanillin, and syringaldehyde). We found that increasing temperature increases their formation rate by an order of magnitude more than increasing electrical potential. For example, increasing temperature from 21 to 180 °C increases the vanillin formation rate by +16.5 mg⋅L−1⋅h−1 ±1.7 mg⋅L−1⋅h−1, while increasing electrical potential from 0 to 2 V increases the vanillin formation rate by −0.6 mg⋅L−1⋅h−1 ±1.4 mg⋅L−1⋅h−1.
Retinal microvasculature and incident dementia over 10 years: The Three‐City‐Alienor cohort
Authors: Rebouças Sara Cristina Lima , Cougnard‐Gregoire Audrey , Arnould Louis , Delyfer Marie‐Noëlle , Schweitzer Cédric , Korobelnik Jean‐François , Foubert‐Samier Alexandra , Cheung Carol Y. , Wong Tien Y. , Delcourt Cécile , Helmer Catherine 
Published: October 2023

AbstractIntroductionWe explored the longitudinal relationship between retinal vascular features and dementia incidence over 10 years.MethodsAmong 584 participants from the Three‐City‐Alienor (3C‐Alienor) population‐based cohort, quantitative retinal vascular features (caliber, tortuosity, fractal dimension) were measured using semi‐automated software. Dementia was actively diagnosed over the follow‐up period.ResultsOne hundred twenty‐eight participants (21.9%) developed dementia over a median of 7.1 years. In Cox proportional hazards models adjusted for sociodemographic characteristics, apolipoprotein E (APOE) ε4, and vascular factors, increased retinal arteriolar tortuosity was associated with all‐cause dementia (hazard ratio per standard deviation increase, 1.21; 95% confidence interval: 1.02–1.44). Wider retinal calibers and a higher venular tortuosity were associated with mixed/vascular dementia, but not Alzheimer's disease. Fractal dimensions were not associated with dementia.DiscussionChanges in the retinal microvasculature were associated with dementia risk. More studies are needed to replicate these findings and determine which features might help identify persons at risk at an early stage.HIGHLIGHTS
The retinal microvasculature might reflect the brain microvasculature
We explored the association between retinal vascular features and incident dementia
584 participants from the Three‐City‐Alienor cohort were followed‐up over 10 years
Increased arteriolar tortuosity and venular calibers were associated with dementia risk
Retinal imaging might help identify persons at risk of future dementia