bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effector Regulated Catalytic Cyclization of Alkynoic Acids Using Pt2L4 Cages
Authors: Bobylev Eduard O. , Ruijter Julian , Poole David A. , Mathew Simon , de Bruin Bas , Reek Joost N. H. 
Published: February 2023

AbstractMetabolic pathways are highly regulated by effector molecules that influences the rate of enzymatic reactions. Inspired by the catalytic regulation found in living cells, we report a Pt2L4 cage of which the activity can be controlled by effectors that bind inside the cage. The cage shows catalytic activity in the lactonization of alkynoic acids, with the reaction rates dependent on the effector guest bound in the cage. Some effector guests enhance the rate of the lactonization by up to 19‐fold, whereas one decreases it by 5‐fold. When mixtures of specific substrates are used, both starting materials and products act as guests for the Pt2L4 cage, enhancing its catalytic activity for one substrate while reducing its activity for the other. The reported regulatory behavior obtained by the addition of effector molecules paves the way to the development of more complex, metabolic‐like catalyst systems.
The jet emitting disk‐standard accretion disk model applied to the active galactic nuclei ultra violet–X‐ray correlation
Authors: Barnier S. , Petrucci P.‐O. , Ferreira J. , Marcel G. 
Published: February 2023

AbstractThe non‐linear correlation between the UV and X‐ray emission observed in active galactic nuclei remains a puzzling question that challenges accretion models. While the UV emission originates from the cold disk, the X‐ray emission is emitted by a hot corona whose physical characteristics and geometry are still highly debated. The jet emitting disk‐standard accretion disk (JED‐SAD) is a spectral model stemming from self‐similar accretion‐ejection solutions. It is composed of an inner highly magnetized and hot accretion flow launching jets, the JED, and an outer SAD. The model has been successfully applied to X‐ray binaries outbursts. The AGN UV–X‐ray correlation represents another essential test for the JED‐SAD model. We use multiple AGN samples to explore the parameter space and identify the regions able to reproduce the observations. In this first paper, we show that the JED‐SAD model is able to reproduce the UV–X‐ray correlation.
Prognostische Ermittlung der Lebenszyklusrendite mit BIM
Authors: Mösl Martin , Tautschnig Arnold 
Published: February 2023

AbstractDer Werterhalt von Immobilien wird zunehmend durch die Einbeziehung von Nachhaltigkeitsaspekten in der Planung sichergestellt. Dadurch ist bereits in der Phase der Projektentwicklung die lebenszyklusbezogene Betrachtung der künftigen Ertragssituation einer Immobilie erforderlich. Durch Gegenüberstellung der Erlöse zu den Lebenszykluskosten lässt sich die von den Autoren so bezeichnete Lebenszyklusrendite (LZR) als prognostischer Parameter zur Beurteilung der Rentabilität einer Investition ermitteln. In diesem Beitrag werden zur Ermittlung der LZR die zu einem frühen Zeitpunkt vorhandenen Projektinformationen in ein digitales Bauwerksmodell eingebunden. Durch Building Information Modeling (BIM) kann in einer frühen Projektphase die Unschärfe der Kostenermittlung durch Verknüpfung des digitalen Planungsstands mit relevanten Gebäudeinformationen verringert werden. Auf Basis eines digitalen Bauwerksmodells gelingt so eine nachvollziehbare und auf Planungsvarianten anpassbare Ermittlung der LZR. Die Aufgliederung aller für den Lebenszyklus relevanten Erlöse bzw. Einnahmen und Kosten bzw. Ausgaben ist dazu erforderlich. Änderungen und Ergänzungen am Bauwerksmodell erfordern eine laufende und durch das digitale Modell rasch mögliche Anpassung der Berechnungen an den jeweiligen Planungsstand. Eine laufende Kontrolle der zu Projektbeginn definierten Ausgangsparameter ist dadurch möglich.
Simultaneous extraction of chlorophylls, proteins, and carbohydrates from isolated Chlorella thermophila using a triphasic separation technique: A biorefinery approach
Authors: Sarkar Sambit , Bhowmick Tridib Kumar , Gayen Kalyan 
Published: February 2023

AbstractThe separation of multiple products from microalgae using a biorefinery approach is essential for the economic sustainability of microalgae‐based products. In the current study, a technique for the simultaneous extraction of such products was investigated for the complete valorization of microalgae biomass. Three principal metabolites – chlorophylls, carbohydrates and proteins – were simultaneously fractionated from the biomass of isolated Chlorella thermophila using a modified version of the triphasic separation (TPS) process. Optimized process parameters were determined as: (i) ammonium sulfate as the salt; (ii) 40% (w/v) as the salt concentration; (iii) 1:1 as the salt/alcohol ratio; (iv) 0.25% (w/w) as biomass loading; (v) 6 min of homogenization time, and (vi) 10 000 rpm as homogenization speed. These optimized process parameters resulted in the simultaneous recovery of 71%, 40%, and 22% yields for proteins, carbohydrates, and chlorophylls, respectively. Ultrastructure analysis revealed that intracellular metabolites could be extracted without complete cell disruption. Finally, a comparative analysis between triphasic separation with and without homogenization demonstrated the economic feasibility of the optimized extraction process.
Multiple myeloma with plasmacytoma of the clivus bone presenting with multiple cranial nerve III, IV, and VI palsy: A diagnostic dilemma
Authors: Shah Chiranjiwi Prasad , Chamlagain Rajan , Shah Sangam , Paudel Subodh , Sah Sanjit Kumar , Koirala Bipin , Pandit Kamal , Sitaula Sanjeeta , Shrestha Anjan 
Published: February 2023

AbstractCentral nervous system (CNS) manifestation with cranial nerve palsy in multiple myeloma (MM) is a rare manifestation. Plasmacytoma originates from the bones of the skull base in 3% patients with MM but rarely develops from the soft tissues of the nasal cavity and paranasal sinuses. Here, we present a case of 68‐year‐old male patient with multiple myeloma, clivus bone plasmacytoma, and cavernous sinus syndrome.
SnS−SnO2Heterostructures Anchored on GO as a High‐Performance Anode for Sodium Ion Battery
Authors: Li Qian , Yu Fuyuan , Cui Yaru , Wang Juan , Zhao Yan , Peng Jianhong 
Published: February 2023

AbstractSnO2is a theoretically excellent transformed anode material with high theoretical capacity for SIBs. However, SnO2faces serious volume effect and high resistance, which greatly damages its electrochemical performance. Given that, the SnS−SnO2heterostructures is constructed with special internal electric field, which is beneficial to promote the transfer ability of sodium ions. Besides, the graphene oxide (GO) modification is carried out to isolate the intrinsic materials from direct contact with electrolyte, and alleviate volume expansion of the anode, ultimately promote the electrochemical performance. Furthermore, the structure and the conductivity characteristics of SnS, SnO2, SnS−SnO2and SnS−SnO2@ GO are simulated respectively by first principles and are compared with the correspondence experiment results to verify the accuracy of established models. Owing to the special p‐n junction in SnS−SnO2@GO heterostructures, the resistance of SnS−SnO2@GO can be reduced to 36.23 Ω, much lower than that of SnO2(Rct=341.9 Ω). Notably, the combination of GO has effectively alleviated the volume expansion of SnS−SnO2@GO electrodes, and present excellent capacity higher than 384.7 mAh g−1after 100 cycles. Thus, the efficient synthesis of SnS−SnO2@GO heterostructure electrodes with excellent performance for sodium storage is expected to provide valuable direction for SIBs anode materials.
Synthesis of Polysubstituted Naphthofurans and Indenofurans Based on a Regiodivergent Intramolecular Carbometalation Strategy with 2‐(2’‐Alkynylaryl)‐3‐iodofurans
Authors: Kondoh Azusa , Aita Kohei , Terada Masahiro 
Published: February 2023

AbstractEfficient methods for the synthesis of two types of furan‐fused tricyclic compounds were developed based on a regiodivergent intramolecular carbometalation strategy using 2‐(2’‐alkynylaryl)‐3‐iodofurans as a common substrate. The iodine‐magnesium exchange/copper‐mediated 6‐endo‐anti intramolecular carbometalation sequence followed by nucleophilic substitution or palladium‐catalyzed cross‐coupling provided 2,3,4,5‐tetrasubstituted naphtho[1,2‐b]furans. On the other hand, the formal intramolecular 5‐exo‐anti carbopalladation/cross‐coupling sequence afforded 2,3‐disubstituted 4‐alkylidene‐4H‐indeno[1,2‐b]furans. The present methods provide new access to a wide range of well‐organized polysubstituted naphtho[1,2‐b]furans and indeno[1,2‐b]furans in a positional selective manner that are otherwise difficult to access.
Evaluating the performance of designed terpolymers for polymer flooding
Authors: Scott Alison J. , Bhicajee Priyadarshini , Kistamah Rowan , Romero‐Zerón Laura , Penlidis Alexander 
Published: February 2023

AbstractIn this work, polymeric materials designed for enhanced oil recovery (EOR) were evaluated for their intended application. Properties including viscosity, flow through porous media (resistance factor and residual resistance factor), and heavy oil displacement (incremental oil recovery) were assessed for designed terpolymers of 2‐acrylamido‐2‐methylpropane sulphonic acid (AMPS), acrylamide (AAm), and acrylic acid (AAc). The same properties were evaluated for two commercially available reference materials (e.g., partially hydrolyzed polyacrylamides or HPAM) with similar characteristics, which allowed for direct comparison between the newly designed terpolymers and materials that are currently on the market for the polymer flooding application. The incremental oil recovery directly associated with polymer flooding, which includes both the polymer flooding and post‐polymer waterflooding stages (excluding the initial waterflooding injection (or secondary) oil recovery), demonstrates that the designed terpolymers provided a higher incremental recovery (42% and 58%) than the reference materials (33% and 46%). Therefore, the terpolymers provided a higher contribution to incremental (or enhanced) oil recovery than the typical HPAM. Additionally, both designed terpolymers showed better injectivity in unconsolidated porous media and are less likely to cause plugging than the commercially available reference materials. Therefore, using a targeted design approach ultimately led to polymeric materials with excellent performance for EOR polymer flooding applications.
Pseudoknots in RNA Structure Prediction
Authors: Hollar Andrew , Bursey Hunter , Jabbari Hosna 
Published: February 2023

AbstractRNA molecules play active roles in the cell and are important for numerous applications in biotechnology and medicine. The function of an RNA molecule stems from its structure. RNA structure determination is time consuming, challenging, and expensive using experimental methods. Thus, much research has been directed at RNA structure prediction through computational means. Many of these methods focus primarily on the secondary structure of the molecule, ignoring the possibility of pseudoknotted structures. However, pseudoknots are known to play functional roles in many RNA molecules or in their method of interaction with other molecules. Improving the accuracy and efficiency of computational methods that predict pseudoknots is an ongoing challenge for single RNA molecules, RNA‐RNA interactions, and RNA‐protein interactions. To improve the accuracy of prediction, many methods focus on specific applications while restricting the length and the class of the pseudoknotted structures they can identify. In recent years, computational methods for structure prediction have begun to catch up with the impressive developments seen in biotechnology. Here, we provide a non‐comprehensive overview of available pseudoknot prediction methods and their best‐use cases. © 2023 Wiley Periodicals LLC.
Platelet Phenotyping by Full Spectrum Flow Cytometry
Authors: Spurgeon Benjamin E. J. , Frelinger Andrew L. 
Published: February 2023

AbstractPlatelets play key roles in hemostasis, immunity, and inflammation, and tests of platelet phenotype and function are useful in studies of disease biology and pathology. Full spectrum flow cytometry offers distinct advantages over standard tests and enables the sensitive and simultaneous detection of many biomarkers. A typical assay provides a wealth of information on platelet biology and allows the assessment of in vivo activation and in vitro reactivity, as well as the discovery of novel phenotypes. Here, we describe the analysis of platelets by full spectrum flow cytometry and discuss a range of controls and methods for interpreting results. © 2023 Wiley Periodicals LLC.Basic Protocol: Platelet phenotyping by full spectrum flow cytometrySupport Protocol 1: Spectral unmixingSupport Protocol 2: Data preprocessing
Can early caucus improve a community mediation model? Counteracting stressors prior to joint session
Authors: Tanz Jill S. , McClintock Martha K. , Kyritsi Rae 
Published: February 2023

AbstractThis investigation tests whether adding an early caucus (EC) before joint session is beneficial or detrimental to the mediation process. Parties and mediators were asked open‐ended questions about the use of EC to evaluate its benefits and costs. Party and mediator responses were overwhelmingly positive. In addition, there was no evidence of potential costs of EC, increasing mediator bias or impinging on time for joint session. Most responses showed that EC helped foster a sense of control, set a calm tone, and build rapport, counteracting the typical stressors in a joint session that can hamper settlement. EC also improved the process for the mediator, providing crucial information on what to expect in joint session, time to plan for emotional joint sessions, and an early opportunity to build rapport prior to the joint session. When surveyed 5 years later, mediators had sustained their positive views about EC. To supplement these findings in a wider range of cases, the parties' evaluations of the entire mediation session were also studied, comparing previous cases without an EC, to cases with EC and other types of Prior Meetings (IPVA Screens and both EC and IPVA Screens). Prior Meetings did not degrade perception of the mediation. In fact, Prior Meetings increased parties' perceptions that mediators understood and respected them and tended to increase perceptions that the mediator clearly explained what would happen and gave everyone a chance to talk about what was important. The EC experience can be generalized to other types of meetings with the mediator prior to joint session. This empirical study has implications for the current discussions about use of pre‐mediation sessions and concerns about declining use of joint session.
A Bifunctional Fluorine‐Free Electrolyte Additive for Realizing Dendrite‐Free Lithium Anodes
Authors: Zhou Hanxiao , Li Tianhui , Liu Wenjing , Guo Zhihao , Su Zihao , Gao Jingjing , Qu Meizhen , Peng Gongchang 
Published: February 2023

AbstractOwing to the strong energy advantage of lithium anodes, the development of lithium‐metal batteries has become an inevitable trend. However, plagued by the instability of solid‐electrolyte interphase (SEI) films, lithium metal anodes face challenges such as lithium dendrite formation and volume expansion. Studies have proven that modulating the composition and structure of SEI films by using electrolyte additives is a convenient and valid method. Currently, it is widely accepted that fluoride is an effective additive but, based on the high cost of fluoride production and environmental concerns, the development of fluoride‐free additives is of great significance. In this work, the bifunctional additive N,O‐bis(trimethylsilyl)acetamide (BSA) is proposed, which can build up a SEI layer that is rich in SiOx and Li3N on the surface of the lithium anode to control the deposition behavior of lithium and clean the electrolyte of HF to protect the electrode. The experimental results indicate that BSA suppresses the generation of lithium dendrites and controls the volume expansion of lithium anodes. Moreover, compared with the commonly used carbonate electrolytes, the battery containing BSA has the best overall performance. Methodologically, the results can be extended to other additives containing Si−O functional groups to replace the same type of fluorine‐containing additives.
Emerging roles of planar cell polarity proteins in glutamatergic synapse formation, maintenance and function in health and disease
Authors: Freitas Andiara E. , Gorodetski Lilach , Lim Wei Ling , Zou Yimin 
Published: February 2023

AbstractThe local signaling mechanism which directly assembles and maintains glutamatergic synapses has not been well understood. Glutamatergic synapses are made of presynaptic and postsynaptic compartments with distinct sets of proteins. The planar cell polarity (PCP) pathway is highly conserved and responsible for establishing and maintaining the cell and tissue polarity along the tissue plane. The six core PCP proteins form antagonizing complexes within the cells and asymmetric intercellular complexes across neighboring cells which regulate cell‐cell interactions during planar polarity signaling. Accumulating evidence suggests that the PCP proteins play essential roles in glutamatergic synapse assembly, maintenance and function in the brain. This review summarizes the key evidence that PCP proteins may be responsible for the formation and stability of the vast majority of the glutamatergic synapses in hippocampus and medial prefrontal cortex, the progress in understanding the mechanisms of how PCP proteins assemble and maintain glutamatergic synapses and initial insights on how disruption of the function of the PCP proteins can lead to neurodegenerative, neurodevelopmental and neuropsychiatric disorders. The PCP proteins may be the missing pieces of a long‐standing puzzle and filling this gap of knowledge may provide the basis for understanding many unsolved questions in synapse biology.
Synthesis and Structural Analysis of Organic Cyclic Polyselenides Obtained from the Reaction of a Bissilylcarbenoid with Selenium
Authors: Sugamata Koh , Asakawa Teppei , Minoura Mao 
Published: February 2023

AbstractThe synthesis and isolation of the first examples of a tetraselenolane and a hexaselenepane, obtained from the reaction of a bissilylcarbenoid (RSi2CBrLi; RSi=SiMePh2) with elemental selenium, is reported. The molecular structures of these cyclic polyselenides were determined using single‐crystal X‐ray diffraction analysis. The selective synthesis of these polyselenides was achieved by controlling the reaction temperature. Stoichiometric deselenation of the hexaselenepane with triphenylphosphine afforded the corresponding tetraselenolane in quantitative yield. Further deselenation of the tetraselenolane with excess triphenylphosphine did not furnish the expected selenoketone but the diselenirane, as confirmed by spectroscopic analysis.
Transition‐Metal‐Free Radical Borylation Reactions
Authors: Shang Zhi‐Hao , Pan Jun , Wang Zeyu , Zhang Ze‐Xin , Wu Jingjing 
Published: February 2023

AbstractOrganoboron compounds are versatile synthons in synthetic chemistry, materials science, and medicinal chemistry. The preparation of them often requires either reactive organometallic reagents or transition metals. In recent years, transition‐metal‐free borylation methodologies using radical chemistry for C−B bond formation have attracted much attention and developed rapidly, which circumvents the use of preformed organometallic reagents. Various successful approaches from different radical precursors (such as carboxylic acids, amines and alcohols, which are abundant in nature) through either thermochemical, photochemical or electrochemical pathways have been developed. Therefore, in this review, we hope to provide an overview of recent advances in the discovery, development, and mechanistic study of transition‐metal‐free radical borylation processes.
Reactivity Tuning of Metal‐Free Artificial Photoenzymes through Binding Site Specific Bioconjugation
Authors: Kuckhoff Thomas , Brewster Richard C. , Ferguson Calum T. J. , Jarvis Amanda G. 
Published: February 2023

AbstractThe design and development of artificial metal‐free photoenzymes aims to combine the selectivity of enzymatic reactions with the benefits of modern synthetic photocatalysts. Removing the need for rare earth metals and allowing for milder reaction conditions, leading to a more sustainable catalytic system. Here, we present the design of a novel artificial photoenzyme by integrating an organophotocatalytic moiety based on a donor‐acceptor design into a steroid carrier protein (SCP‐2L). SCP‐2L possesses a hydrophobic tunnel facilitating substrate binding in aqueous media. The photocatalyst was site‐selectively bound to three SCP‐2L variants, possessing a non‐native cysteine residue strategically placed around the hydrophobic tunnel of the protein. The three modified photoenzymes were shown to be selective for the oxidation of organic sulfides giving up to 192 turnovers.
Syntheses and Preliminary Biological Evaluations of the Dibromopyrrole‐Containing Marine Natural Products Agesasine A, Agesasine B, Longamide E and Various Congeners
Authors: Chen Chengzhi , Yuan Tingting , Lan Ping , White Lorenzo V. , Chen Jing , Banwell Martin G. 
Published: February 2023

AbstractTotal syntheses of the title marine natural products have been achieved and so confirming the structures originally assigned to them. Upon subjecting agesasine A and its corresponding ethyl ester to Mitsunobu conditions, a 1,5‐cyclodehydration reaction takes place to give 2‐oxazolines. In contrast, on subjecting agesasine B to the same Mitsunobu conditions, a simple dehydration reaction occurs to give the corresponding acrylate. A total synthesis of longamide E was achieved by engaging a 1,2‐disubstituted pyrrole in a lactam‐forming reaction and this was followed by a two‐fold and fully regio‐controlled bromination reaction. A distinctly different and possibly biomimetic route was used to synthesize, via the open‐chain natural product nakamurine B, longamide B and its methyl ester. Preliminary biological evaluations of the title alkaloids and various analogues against a small human cancer cell line panel reveals cytotoxic properties that vary significantly with structure.
Synthetic Studies Concerned with the Proposed Structure of Ribisin F, a Compound with Nerve Growth Factor Potentiating Activity Isolated from the Medicinal Fungus Phellinus ribis
Authors: Zhang Yuqi , Lan Ping , Banwell Martin G. 
Published: February 2023

AbstractThe synthesis of the enantiomer of the structure assigned to the title natural product has been achieved from abundant quinic acid. However, the NMR spectral data acquired on the synthetic material do not match those reported for ribisin F (which are of rather modest quality). In an effort to establish the true structure of ribisin F, an epimer of the assigned structure was also prepared from quinic acid. A comparison of the spectral data obtained on this epimer with those reported for the natural product proved a better match and based on optical rotation data the possible true structure of this distinctive, dihydroxylated and benzofuran‐containing compound is tentatively proposed.