bluuebunny/crossref_metadata_2025_split huggingface dataset:
Catalytic Promiscuity of Fatty Acid Photodecarboxylase Enables Stereoselective Synthesis of Chiral α‐Tetralones
Authors: Xu Weihua , Mou Kaihao , Lu Zhenyu , Kang Xiuwen , Guo Yue , Ding Bei , Chen Zhirong , Wang Zhiguo , Wu Qi 
Published: August 2024

AbstractIn the field of biocatalysis, discovering novel reactivity from known enzymes has been a longstanding challenge. Fatty acid photo‐decarboxylase from Chlorella variabilis (CvFAP) has drawn considerable attention as a promising photoenzyme with potential green chemistry applications; however, its non‐natural reactivity has rarely been exploited to date. Herein we report a non‐natural reductive dehalogenation (deacetoxylation) reactivity of CvFAP inspired by its natural oxidative decarboxylation process, enabling the stereoselective synthesis of a series of chiral α‐substituted tetralones with high yields (up to 99 %) and e.r. values (up to 99 : 1). Mechanistic studies demonstrated that the native photoenzyme catalyzed the reductive dehalogenation via a novel mechanism involving oxidized state (FADox)/semiquinone state (FADsq) redox pair and an electron transfer (ET)/proton transfer (PT) process of radical termination, distinct from the previous reports. To our knowledge, this study represents a new example of CvFAP promiscuity, and thus expands the reactivity repertoire of CvFAP and highlights the versatility of CvFAP in asymmetric synthesis.
Molecular Iridium Catalyzed Electrochemical Formic Acid Oxidation: Mechanistic Insights
Authors: Zhou Yuzhu , Xu Wenjie , Wei Zhen , Tian Dong , Zhu Baiquan , Qiao Sicong , Chen Yanxia , He Qun , Song Li 
Published: August 2024

AbstractElectrochemical formic acid oxidation reaction (FAOR) is a pivotal model for understanding organic fuel oxidation and advancing sustainable energy technologies. Here, we present mechanistic insights into a novel molecular‐like iridium catalyst (Ir−N4−C) for FAOR. Our studies reveal that isolated sites facilitate a preferential dehydrogenation pathway, circumventing catalyst poisoning and exhibiting high inherent activity. In situ spectroscopic analyses elucidate that weakly adsorbed intermediates mediate the FAOR and are dynamically regulated by potential‐dependent redox transitions. Theoretical and experimental investigations demonstrate a parallel mechanism involving two key intermediates with distinct pH and potential sensitivities. The rate‐determining step is identified as the adsorption of formate via coupled or sequential proton‐electron transfer, which aligns well with the observed kinetic properties, pH dependence, and hydrogen/deuterium isotope effects in experiments. These findings provide valuable insights into the reaction mechanism of FAOR, advancing our understanding at the molecular level and potentially guiding the design of efficient catalysts for fuel cells and electrolyzers.
Platinum‐Catalyzed Regio‐ and Enantioselective Diboration of Unactivated Alkenes with (pin)B−B(dan)
Authors: Fang Huaquan , Manoj Niket , Popescu Mihai V. , Noble Adam , Paton Robert S. , Aggarwal Varinder K. 
Published: August 2024

AbstractAsymmetric diboration of terminal alkenes is well established, and subsequent selective functionalization of the less hindered primary boronic ester is commonly achieved. Conversely, selective functionalization of the sterically less accessible secondary boronic ester remains challenging. An alternative way to control chemoselective functionalization of bis(boron) compounds is by engendering different Lewis acidity to the two boryl moieties, since reactivity would then be dictated by Lewis acidity instead of sterics. We report herein the regio‐ and enantioselective Pt‐catalyzed diboration of unactivated alkenes with (pin)B−B(dan). A broad range of terminal and cyclic alkenes undergo diboration to furnish the differentiable 1,2‐bis(boron) compounds with high levels of regio‐ and enantiocontrol, giving access to a wide variety of novel building blocks from a common intermediate. The reaction places the less Lewis acidic B(dan) group at the less hindered position and the resulting 1,2‐bisboryl alkanes undergo selective transformations of the B(pin) group located at the more hindered position. The regioselectivity of the diboration has been studied by DFT calculations and is believed to originate from the trans influence, which lowers the activation barrier for formation of the regioisomer that places the weaker electron donor [B(pin) vs B(dan)] opposite the strong electron donor (alkyl group) in the platinum complex.
Catalytic Asymmetric Construction of C‐ and Si‐Stereogenic Silacyclopentanes via Hydrosilylation of Arylmethylenecyclopropanes
Authors: Wu Liexin , Zhang Lu , Guo Jiandong , Gao Jihui , Ding Yang , Ke Jie , He Chuan 
Published: August 2024

AbstractSilacycles have exhibited significant potential for application in the fields of medicinal chemistry, agrochemistry, and materials science. Accordingly, the development of effective methods for synthesizing these compounds has attracted increasing attention. Here, we report an efficient Cu‐catalyzed enantioselective hydrosilylation of arylmethylenecyclopropanes with hydrosilanes, that allows the rapid assembly of various enantioenriched carbon‐ and silicon‐stereogenic silacyclopentanes in good yields with excellent enantioselectivities and diastereoselectivities under mild conditions. Further stereospecific transformation of the Si−H bond on the chiral silicon center expands the diversity of these C‐ and Si‐stereogenic silacyclopentanes.
Environmental aging influence on mechanical properties of additive manufactured polyamide parts: A statistical approach
Authors: Ghimouz Chahine , Kenné Jean Pierre , Hof Lucas A. 
Published: August 2024

AbstractThis study explores the influence of environmental factors and printing orientation on the aging of additive manufactured polyamide 12 (PA12). A multifactorial experimental design was employed to age specimens under controlled conditions. Analysis of variance revealed that temperature, irradiance, relative humidity, and time significantly impact the ultimate tensile strength (UTS) and Young's modulus (Y) of PA12. Applying multiple linear regression methods produced predictive models with R2 values of 0.9075 for the UTS and 0.5226 for the Y, indicating substantial explanatory power for the specimen's UTS. These models enhance understanding of PA12 aging, aiding in the design of more durable mechanical parts for applications exposed to environmental conditions, such as footwear, automotive components, and medical devices. As next steps, future research could empirically deploy these developed predictive models and explore longer time scales to further elucidate the long‐term aging behavior of additively manufactured PA12.
Cavitation behavior of poly(4‐methyl‐1‐pentene)/polypropylene/poly(4‐methyl‐1‐pentene) tri‐layer film: Influence of annealing and stretching temperature
Authors: Shi Honghui , Shi Wenjing , Chang Baobao , Mo Jiajia , Huang Kai , Wang Shitong , Liu Chuntai , Shen Changyu 
Published: August 2024

AbstractIn this work, poly(4‐methyl‐1‐pentene)/polypropylene/poly(4‐methyl‐1‐pentene) tri‐layer films were prepared. The microstructure of the film was adjusted by annealing in the temperature range of 150–237.5°C. Afterward, the influence of annealing and stretching temperature on the cavitation behavior of the film was investigated by small‐angle x‐ray scattering (SAXS). Results showed that for the “butterfly” scattering in the early stage, the radius of gyration () and maximum dimension () of voids were ca. 75 and 200 nm, which were hardly influenced by annealing. Whereas, the volume fraction of voids was enlarged obviously, suggesting that more voids were formed; for the “streak” scattering in the late stage, the length of voids () grew gradually with stretching, and the ultimate value of was 432.5 nm for un‐annealed film and 176 nm for film annealed at 230°C. Simultaneously, the misorientation of voids was reduced from 0.33 to 0.18. As the stretching temperature was elevated from 30 to 45 and 60°C, and maintained at 75 and 200 nm, and was enlarged to 434 and 432 nm. At the same time, the number of voids was reduced obviously. As the stretching temperature was 90°C, the voids were suppressed.
A novel benzoquinone‐azo linked polymer‐based active electrode material for high‐performance symmetric pseudocapacitors
Authors: Jagadale Sudhir D. , Bhosale Sidhanath V. , Bhosale Sheshanath V. 
Published: August 2024

AbstractPseudocapacitors (PSCs) have attracted researcher's attention due to their potential electrochemical performance as the power source for electronic devices. However, to maintain the high electrochemical properties of pseudocapacitive materials becomes critical. Therefore, the active electrode materials design and synthesis is a challenging task. To tackle these problems, herein, we rationally designed new polymer based on benzoquinone with azo linker. The polymer AZO‐BQ‐P was synthesized and tested for their energy storage applications in combination with graphite foil (GF). In three‐electrode supercapacitor (SC) device, the AZO‐BQ‐P/GF electrode exhibits excellent specific capacitance (Csp) of about 306.27 F g−1 at 0.5 A g−1 current density and higher cycling stability. The pseudocapacitive performance of SC cells result from synergistic effect of AZO‐BQ‐P and GF and due to faster electrolyte ion diffusion and increased availability at electrode/electrolyte interfaces. Furthermore, AZO‐BQ‐P/GF electrode was employed to fabricate two‐electrode AZO‐BQ‐P/GF//AZO‐BQ‐P/GF symmetric SC device. The optimal SSC device shows a Csp reaching 200 F g−1 at 0.5 A g−1, which is an impressive value. Also, it exhibits remarkable cycling stability with 86.18% Csp retention after 5000 galvanostatic charging–discharging (GCD) cycles at 3 A g−1. The SSC device applying AZO‐BQ‐P/GF electrode delivers an excellent energy density (ED) of 25.00 Wh kg−1 at 900.00 W kg−1 power density (PD). Thus, the novel polymer design offers efficient electrode materials to enhance the pseudocapacitive electrochemical performance of the SSC device. This concept can be extended for fabricating other electrochemical systems and accelerate its applications for modern electronic devices.
The effect of three types of heat treatment on the hardness and corrosion resistance of Al 2014 alloy
Authors: Iqbal Ansari Shadab Azhar Nazeer , Rahman M Abdur , Naveed Hussain H. 
Published: August 2024

AbstractAl 2014 is a high‐strength aluminum alloy widely used in the aerospace and automotive industries for its mechanical strength. This research examines the effects of three heat treatment processes—retrogression and re‐aging (RRA), T6 standard aging, and a modified RRA with high‐temperature pre‐aging—on the hardness and corrosion resistance of Al 2014. Polarization studies using potentiodynamic electrochemical methods in a 3.5 wt% sodium chloride solution were conducted to evaluate the corrosion resistance. The results showed that heat treatment, which causes precipitation hardening, shifted the corrosion potential (E) toward a more noble direction. The formation of Al2Cu precipitates is associated with improved corrosion resistance. Additionally, samples treated with the T6 process exhibited a higher corrosion current density compared to untreated Al 2014 alloy samples, indicating superior corrosion resistance. Analysis of corroded surfaces using scanning electron microscopy (SEM) with energy‐dispersive X‐ray spectroscopy (EDS) showed evidence of general and pitting corrosion, with distinct patterns among the three heat treatment processes. A comparison of the results revealed that the T6 standard aging process provided the best combination of hardness and corrosion resistance. This was likely due to the formation of stable precipitates during aging. The results also indicated that the RRA process showed good performance, suggesting it is a viable alternative when a balance between hardness and toughness is required. The modified RRA with high‐temperature pre‐aging resulted in lower performance, likely due to overaging, which reduced hardness and corrosion resistance. These findings highlight the significance of heat treatment in improving the corrosion resistance of Al 2014 alloy. This suggests that particular processes can enhance the alloy's durability in corrosive environments, potentially leading to a longer lifespan and reduced maintenance costs. The T6 standard aging process offers the best balance of enhanced hardness and corrosion resistance for Al 2014 alloy, making it ideal for extending lifespan and reducing maintenance costs in corrosive environments. Careful selection of heat treatment is crucial based on specific alloy performance requirements.
“Thus far and no further”: Inquiry into a dreamless society
Authors: Civitarese Giuseppe , Distel Edward 
Published: August 2024

AbstractHumans are highly social primates who naturally seek out groups in which to live. Our individual psychology is inherently intertwined with that of the group, forming an inextricable link between the two. In keeping with Bion's insights into group dynamics, we approach contemporary conflicts by examining them through both social and psychoanalytic lenses. Drawing on Foucault's and Deleuze's analyses of societies, as well as considering the impact of technology and the COVID‐19 pandemic, we illustrate how modern societies function under the influence of three behaviors observed by Bion. Activated as a result of a psychological disaster, the ruins consist of the symptomatologic triad of arrogance, stupidity, and curiosity. We have called this functioning Bion's disastrous triad. We suggest that when it is set in motion, it leads to a withdrawal from the beauty of life, as Bion well expresses with the phrase “Thus far and no further.” Using Meltzer's notion of aesthetic conflict, we suggest that while operating under the mandates of the triad, recognition of the other becomes an impossibility. A plea for relationships based on mutual recognition—namely, aesthetic relationships—is in order.
Narrow‐Bandwidth I–III–VI Semiconductor Nanocrystals: Synthesis, Luminescence and Applications in Quantum‐Dot Light‐Emitting Diodes
Authors: Xie Xiulin , Jiang Tianyi , Lin Ouyang , Liu Jiahao , Zhang Yu , Tang Aiwei 
Published: August 2024

AbstractI‐III‐VI semiconductor nanocrystals (NCs) have emerged as promising candidates in quantum‐dot light‐emitting diodes (QLEDs) due to their environmental‐benign nature and capability for large‐scale tunable emission as well as straightforward synthesis. However, the photoluminescence (PL) emission of I–III–VI type NCs, as reported in numerous studies, exhibits a broader full width at half maximum (FWHM), adversely affecting their color purity. This review delineates the advancements in the development of narrow‐bandwidth I–III–VI NCs, focusing on their synthesis strategies, luminescence mechanisms, and applications in QLEDs. It concludes with a discussion on the challenges confronting narrow‐bandwidth I–III–VI‐based QLEDs and outlines potential strategies for improving device performance.
An idea to explore: Student‐centered scientific and medical writing project and workshop for undergraduate students
Authors: van der Lugt Dionne R. , Smits Talia , El‐Yamani Loubna , van den Eng Thom , Burggraaf Maroeska J. , Horn Ivo R. 
Published: August 2024

AbstractWriting is usually integrated in the curriculum of science studies. However, students often lack the skills to write for various audiences or, to produce a well written manuscript. We developed a concise project of 15 European Credits to improve the writing skills in an early phase of the bachelor study. Students worked on texts from various journals and looked at the writing styles. They rewrote texts in a popular and more scientific way and practiced with clear, vivid language, avoiding clutter and hedge words, considering a proper use of grammar and interpunction. Medical writing was also introduced during the project. Grading was based on rewriting for a non‐expert and expert audience. A rewritten text was presented to the public in the form of a student‐initiated survey. This project shows an inverted approach creating student ownership and enthusiasm for writing. In addition, we created and tested successfully a concise two‐day workshop based on this project. Based on the results we herewith present the work as an idea to explore.
Squaring circular supply chain management: A comprehensive overview of emerging themes and trends
Authors: Garcia‐Buendia Noelia , Núñez‐Merino Miguel , Moyano‐Fuentes José , Maqueira‐Marín Juan Manuel 
Published: August 2024

AbstractCircular supply chain management (CSCM) is the revolutionary integration of circular principles into supply chain management and the supply chain environment to achieve zero waste and outperform traditional supply chain sustainability models in advancing supply chain circularity. This study examines CSCM and the corresponding literature to highlight key research themes and trends. An advanced iteration of the Systematic Science Mapping analysis methodology has been designed and implemented with a Named Entity Recognition approach to extract relevant information from scientific articles. Key themes are revealed such as essential capabilities for circularity in the supply chain, circular business models, sustainable supplier selection and blockchain technology's role. The article gives insights into current research and identifies emerging trends in CSCM. This exploration aims to provide a nuanced understanding of CSCM's transformative power and shed light on its practical implications.
The underlying potential of NLP for microcontroller programming education
Authors: Rocha André , Sousa Lino , Alves Mário , Sousa Armando 
Published: August 2024

AbstractThe trend for an increasingly ubiquitous and cyber‐physical world has been leveraging the use and importance of microcontrollers (C) to unprecedented levels. Therefore, microcontroller programming (CP) becomes a paramount skill for electrical and computer engineering students. However, CP poses significant challenges for undergraduate students, given the need to master low‐level programming languages and several algorithmic strategies that are not usual in “generic” programming. Moreover, CP can be time‐consuming and complex even when using high‐level languages. This article samples the current state of CP education in Portugal and unveils the potential support of natural language processing (NLP) tools (such as chatGPT). Our analysis of CP curricular units from seven representative Portuguese engineering schools highlights a predominant use of AVR 8‐bit C and project‐based learning. While NLP tools emerge as strong candidates as students' C companion, their application and impact on the learning process and outcomes deserve to be understood. This study compares the most prominent NLP tools, analyzing their benefits and drawbacks for CP education, building on both hands‐on tests and literature reviews. By providing automatic code generation and explanation of concepts, NLP tools can assist students in their learning process, allowing them to focus on software design and real‐world tasks that the C is designed to handle, rather than on low‐level coding. We also analyzed the specific impact of chatGTP in the context of a CP course at ISEP, confirming most of our expectations, but with a few curiosities. Overall, this work establishes the foundations for future research on the effective integration of NLP tools in CP courses.
Chemical Profile and Potential Application of Agri‐food Waste Products for Counteracting Diabetes Induced Neuropathy in Rats
Authors: El Souda Sahar S. , Ahmed Hanaa H. , Maamoun Amal A. , Matloub Azza A. , Aglan Hadeer A. 
Published: August 2024

AbstractThis study aimed to prepare defatted ethanol extract of Abelmoschus esculentus leaves, Morus nigra leaves and Punica granatum peel, to identify the chemical composition of these extracts and to explore their efficacy in counteracting diabetic neuropathy. LC‐ESI‐MS spectrometry was the hyphenated tool for component identification of these extracts. Behavioral, biochemical, and histopathological investigations were carried out after treatments of diabetic rats. The phenolic contents in the extracts are 16.38, 34.75 and 40.57 mg GAE/g extract regarding A. esculentus leaves, M. nigra leaves and P. granatum peel respectively. Chemodiversity of the phenolic contents was observed from the LC/Mass, where A. esculentus extract contained isoflavonoids and flavanones, M. nigra extract consisted of benzofurans, prenylated flavonoids, stilbenes, and xanthones, and P. granatum extract was rich in ellagitanins, condensed tannins, and anthocyanins. The extracts normalize of blood glucose levels, enhance the explorative behavior of the rats and their response time to thermal pain, restore the oxidant/antioxidant balance, attenuate inflammation, augment brain monoamines levels and modulate MAO−A and Ache enzyme activity. Furthermore, they recovered brain histopathological alterations. Conclusively, this study offers experimental evidence for the neuroprotective impact of studied defatted ethanol extracts against diabetic neuropathy via their hypoglycemic effect, antioxidant activity, and anti‐inflammatory potential.
Phytochemical Profiles and Biological Activities of Five Wild Camellia Species from Ta Dung, Vietnam
Authors: Nguyen Quang‐Vinh , Mai Quoc‐Quan , Nguyen Minh‐Trung , Bui Thi Bich Huyen , Doan Manh‐Dung , Le Tam Minh , Nguyen Phuoc‐Vinh , Nguyen The‐Hien , Nguyen Thi Thanh‐Huong 
Published: August 2024

AbstractThe C. luuana Orel & Curry (TD3), C. furfuracea (Merr.) Cohen‐Stuard (TD4), C. bidoupensis Truong, Luong & Tran (TD6), C. sinensis (L.) Kuntze (TD7), and C. kissii var. spp (TD8), have been traditionally used as a health‐promoting beverage by local people in Ta Dung, Dak Nong. Despite their potential health benefits, further scientific data on biological and phytochemical properties of these plants is needed. To address this issue, this study was conducted to investigate phytochemical and biological properties of five Camellia species extracts, using DPPH, ABTS radical scavenging, copper chelating (Cu‐chelator), and tyrosinase inhibition (TI), α‐amylase (Al‐AI), and α‐glucosidase (Al‐GI) analyses. As results, ten compounds were identified using UPLC method, in which catechins (mainly EGCG and catechin (Cat)), were the most prevalent, and followed by chlorogenic acid (ChlA), quercitrin (Querci), rutin, and quercetin (Querce). Additionally, multiple factor analysis (MFA) also revealed that TD7, TD3, and TD4 containing high TPC, TFC, high concentrations of EGCG, ChlA, and caffeine were responsible for their high DPPH, ABTS radical scavenging activities, as well asTI, Al‐AI and Al‐GI. Furthemore, TD6 and TD8, possessing elevated levels of Apig, Querci, Rutin, Querce, Cat, and EA, exhibited a high Cu‐chelator property, but a weak enzyme inhibition. From all above‐mentioned results, the antioxidative and enzyme inhibitory potentials of Camellia species extracts collected in Dak Nong province in Vietnam were scientifically demonstrated paving a pathway to develop health supplement in further studies.