bluuebunny/crossref_metadata_2025_split huggingface dataset:
De Novo Discovery of Pseudo‐Natural Prenylated Macrocyclic Peptide Ligands
Authors: Inoue Sumika , Thanh Nguyen Dinh , Hamada Keisuke , Okuma Rika , Okada Chikako , Okada Masahiro , Abe Ikuro , Sengoku Toru , Goto Yuki , Suga Hiroaki 
Published: June 2024

AbstractPrenylation of peptides is widely observed in the secondary metabolites of diverse organisms, granting peptides unique chemical properties distinct from proteinogenic amino acids. Discovery of prenylated peptide agents has largely relied on isolation or genome mining of naturally occurring molecules. To devise a platform technology for de novo discovery of artificial prenylated peptides targeting a protein of choice, here we have integrated the thioether‐macrocyclic peptide (teMP) library construction/selection technology, so‐called RaPID (Random nonstandard Peptides Integrated Discovery) system, with a Trp‐C3‐prenyltransferase KgpF involved in the biosynthesis of a prenylated natural product. This unique enzyme exhibited remarkably broad substrate tolerance, capable of modifying various Trp‐containing teMPs to install a prenylated residue with tricyclic constrained structure. We constructed a vast library of prenylated teMPs and subjected it to in vitro selection against a phosphoglycerate mutase. This selection platform has led to the identification of a pseudo‐natural prenylated teMP inhibiting the target enzyme with an IC50 of 30 nM. Importantly, the prenylation was essential for the inhibitory activity, enhanced serum stability, and cellular uptake of the peptide, highlighting the benefits of peptide prenylation. This work showcases the de novo discovery platform for pseudo‐natural prenylated peptides, which is readily applicable to other drug targets.
Synthesis, characterization and application of polyesters from diglycerol and triglycerol as lubricants and additives
Authors: de Brito Débora Hellen Almeida , Schuller Ana Paula Dantas , Cavalcante Igor Marques , Rocha Natália Rodrigues Castro , Moreira Denise Ramos , Maier Martin Edmund , Petzhold César Liberato , Ricardo Nágila Maria Pontes Silva 
Published: June 2024

AbstractGlycerol is produced on a large scale as a byproduct in the biodiesel market. In order to give an application to glycerol, this work uses diglycerol from synthesized polyglycerol and commercial triglycerol in the synthesis of long chain esters obtained from esterification and transesterification reactions with oleic acid, methyl oleate, and epoxidized methyl oleate. Diglycerol tetraoleate (DGMO), epoxidized diglycerol tetraoleate (DGEMO), and triglycerol pentaoleate (TGOA) were synthesized and characterized by 1H and 13C Nuclear Magnetic Resonance (NMR) and infrared (IR) spectroscopy. Polyglycerol esters were evaluated for basic lubrication properties such as density, kinematic viscosity, viscosity index, melting point, and thermo‐oxidative stability. The ester that showed best thermo‐oxidative stability was DGEMO. In addition, the influence of esters synthesized as additives in a pure paraffinic oil lubricant was evaluated and the TGOA showed greater change in viscosity at 100 and 40°C and in melting point which was increased by 1.56°C.
Magnetically induced PSA composited CNT‐Fe3O4 ultrafiltration membrane
Authors: Zhang Jie , Hao Shuai , Li Yanjie , Lu Chengbo , Rong Rong , Li Jinjing , Ni Jian , Chi Yanxia , Zhou Shujing 
Published: June 2024

AbstractBased on the hydrophilicity of carboxylated carbon nanotubes (CNTs) and the paramagnetism of ferroferric oxide (Fe3O4), a CNT‐Fe3O4 nanocomplex was produced by in situ liquid phase synthesis and a magnetically induced polysulfone amide (PSA) composited CNT‐Fe3O4 ultrafiltration membrane was prepared using an immersion precipitation phase transformation with an inexpensive PSA fiber as the matrix. Fe3O4 nanoparticles were distributed evenly on the CNTs, and the obtained CNT‐Fe3O4 complex exhibited good magnetic properties. For the magnetically induced PSA composited CNT‐Fe3O4 ultrafiltration membrane, the water flux and retention rate under the magnetic field of 1450 Gs were 421.26 L/m2 h and 96.70%, respectively; porosity and pore size were 38.75% and 58.52 nm; contact angle was 39.48°; average tensile strength was 4.61 N/mm2; and weight retention rate reached 29.00% under heat treatment at 900°C. The water flux decreased by 5.40% and 39.33% after 3 weeks of acid and alkaline immersions, respectively. The inhibition zone diameter of Escherichia coli was 11 ± 0.24 mm, and that of Staphylococcus aureus was 11 ± 0.35 mm. The magnetically induced PSA composited CNT‐Fe3O4 ultrafiltration membrane demonstrated stronger electronegativity, smaller average roughness, higher flux recovery rate value, and lower irreversible flux recovery rate value.
Study on water tree resistance and self‐healing properties of multi‐monomer melt‐grafted polyethylene
Authors: Zhu Bo , He Shengkun , Sun Hao , Han Ximu 
Published: June 2024

AbstractIn order to suppress the damage of cable insulation caused by water tree structure formed by micro‐droplets at insulation defects in low density polyethylene (LDPE) materials under AC electric field. In this paper, the siloxane group is grafted onto LDPE by melt grafting method, and different content of comonomer styrene (St) is added to improve the grafting rate of siloxane group grafted polyethylene. The effect of St on the microscopic characteristics of LDPE grafted KH570 is studied. In order to verify the accuracy and timeliness of water tree self‐healing of grafted polymer insulation materials, the microstructure characteristics of LDPE ungrafted and grafted polymer samples are analyzed by Fourier transform infrared spectroscopy, gel content test, and differential scanning calorimeter. Second, the AC dielectric properties of LDPE ungrafted and grafted polymer samples are studied by AC breakdown experiment and space charge test. Finally, the water tree length, micropore defects, and self‐healing of the samples are observed by optical microscopy and polarization and depolarization current method, and the changes of chemical composition in the water tree area before and after aging are analyzed by infrared spectroscopy. The principle and mechanism of repairing water tree defects with grafted monomers are explained. This paper not only combines the previous research results of self‐healing materials, but also provides a new method for the preparation process of LDPE grafted polymer, which has a good research prospect in practical application.
Enhancing dynamic viscoelastic performance of flax fiber/fly ash hollow cenosphere‐reinforced composites coated by in situ fabrication of ultrasonically synthesized nanotitanium dioxide
Authors: Wang Xiaomeng , Noman Muhammad Tayyab , Petrů Michal , Kang Guozheng 
Published: June 2024

AbstractThis study demonstrates a novel, single‐step, and low‐energy ultrasonic approach to fabricate lightweight, high‐performance flax fiber‐reinforced composites enhanced by nanotitanium dioxide coating and fly ash hollow cenospheres. This innovative approach leads to a remarkable 23% weight reduction compared with conventional composites, making it ideal for the applications demanding both lightweight and superior mechanical properties. Through dynamic mechanical testing, it is found that the composites' viscoelastic behavior, including storage modulus and damping factor, is significantly influenced by both frequency and temperature. By applying time–temperature superposition principles, the composite's dynamic properties are comprehensively characterized across a wider frequency range. A modified fractional calculus Huet–Sayegh model accurately captures the observed viscoelastic behavior. The combined effect of nanotitanium dioxide coating, which strengthens the fiber–matrix interface, and the inclusion of rigid fly ash hollow cenospheres results in significant improvements in both storage modulus (10% increase at room temperature) and peak loss factor (80% increase) compared with uncoated flax fiber‐reinforced composites. The nanocoating and cenospheres' rigid shells contribute to enhanced stiffness, while the cenospheres' hollow structure provides efficient energy dissipation mechanisms, leading to an improved damping performance. This ultrasonic approach offers a promising and sustainable method for synthesizing natural fiber nanocomposites with superior viscoelastic properties.
Evaluating the potential white shark (Carcharodon carcharias) swim pattern manipulation capabilities of the novel and noninvasive Shark Exclusion Barrier
Authors: O'Connell C. P. , Pezzano I. , Shandroff S. , Kim‐Suzuki K. , McGuigan H. 
Published: June 2024

Abstract
Even though the risk of a negative encounter with a large and potentially dangerous shark species (e.g. white sharks—Carcharodon carcharias) is exceedingly rare, some localities implement indiscriminate shark culls to minimize this risk.
Due to the negative ecological impact that these lethal shark control measures can have, the present study aimed to test a novel and eco‐friendly shark barrier system, known as the Shark Exclusion Barrier. The Shark Exclusion Barrier is a shark deterrent technology that is composed of a combination of interconnected and telescoping vertical barrier elements (i.e. the visual stimulus) and electromagnetic stimuli (e.g. electromagnets and Barium Ferrite (BaFe12O19) permanent magnets). Using this system, two separate C. carcharias swim pattern manipulation studies were conducted over the course of two research seasons.
In the first season (i.e. 2021), 9, 1‐h trials were conducted where 9–13 different C. carcharias interacted with the barrier.
In the second season (i.e. 2023), 35, 2‐h trials were conducted where 6–10 C. carcharias interacted with the barrier.
Throughout experimentation, C. carcharias exhibited a significantly greater entrance frequency (p < 0.05) and a significantly reduced pass around frequency (p < 0.05) towards the control region when compared to the Shark Exclusion Barrier region.
Furthermore, the barrier exhibited the ability to maintain its structural integrity during swells of ≥2.13 m, breaking waves of ≥1.52 m and a current of ≥1.12 m/s.
Due to the promising results, this technology warrants further investigation to determine if it is a plausible alternative to lethal culling measures.
Command filtered backstepping control of multiple transmission control protocol/active queue management networks with user datagram protocol flows
Authors: Nie Lei , Wang Meng , Yan Huaicheng , Li Zhichen , Tian Yongxiao 
Published: June 2024

AbstractIn this study, the congestion control problem for multiple transmission control protocol/active queue management (TCP/AQM) networks with user datagram protocol (UDP) flows is investigated. Taking the UDP stream as the unknown interference and the maximum interference is obtained by the minimax theorem. A novel control algorithm is designed for multi‐TCP/AQM networks through backstepping control and command filtered technology. Simulation studies are carried out to verify the effectiveness and feasibility of the proposed method.
Determination of oxidation rate constant for nodularin‐r, saxitoxin, dc‐saxitoxin, and neo‐saxitoxin with conventional water treatment plant oxidants and advanced oxidation processes
Authors: Maalouf Samar , Adams Craig , Hoppe‐Jones Christiane 
Published: June 2024

AbstractThe effectiveness of chemical oxidation depends on the type of cyanotoxins present in the water and varies with the water quality parameters. This study investigated four cyanotoxins to understand their reactions with conventional drinking water treatment plant oxidants and with advanced oxidation. Kinetic rate constants between saxitoxin, and two variants (dcSTX and neoSTX), and nodularin‐R with chlorine, monochloramine, permanganate, ozone, and hydroxyl radicals (UV‐H2O2) were developed under different pH and temperature conditions. Nodularin‐R kinetic rate constants were comparable to peer‐reviewed microcystin‐LR rate constants with reaction rates in the order of OH radicals > ozone >> chlorine > permanganate >> monochloramine. The speciation of saxitoxins with pH had a dominant effect on their reaction rates with the listed oxidants. Chlorine was the only oxidant effective for saxitoxins removal. The reaction rates of saxitoxins with OH radicals varied slightly with pH but were around two orders of magnitude less than microcystin‐LR's.
Recent advances in isatin‐based chemosensors: A comprehensive review
Authors: Khan Danish , Shaily  
Published: June 2024

AbstractA comprehensive review presents an illuminating exploration of the vast potential of isatin, an easily accessible organic compound. This review is a valuable resource, offering a concise yet comprehensive account of the recent breakthroughs in isatin applications in medicinal chemistry, fluorescence sensing, and organic synthesis. Moreover, it dives into the exciting advancements in isatin‐based chemosensors, demonstrating their remarkable ability to detect and recognize diverse cations and anions with exceptional precision. Researchers and scientists in the fields of sensing and organic chemistry will find this review indispensable for sparking innovation and developing cutting‐edge technologies with significant real‐world impact.
A green micelle‐enhanced first derivative synchronous fluorescence approach for determination of donepezil HCl and trazodone HCl in their pure state, pharmaceutical dosage form and spiked human plasma
Authors: Abd El wahab Mennah M. , Saad Samar , Sheribah Zeinab A. , El‐Enany Nahed 
Published: June 2024

AbstractThe study's objective is to establish an eco‐friendly, sensitive and economical quantitative methodology for the concurrent analysis of donepezil HCl (DPZ) and trazodone HCl (TRZ) in raw materials, tablets and human plasma. The first derivative synchronous fluorescence spectroscopic (FDSFS) technique was applied at constant wavelength difference (∆λ = 120) for assessment of DPZ and TRZ at each other's zero‐crossing point at 279 nm and 297 nm, respectively. The submitted technique was validated in accordance with ICH Q2 R1 guidelines and the linearity of the standard calibration curve was observed over the concentration range of 10–500 ng/ml for DPZ and 20–1,000 ng/ml for TRZ. The detection limits (LOD) were found to be 2.65 and 5.4 ng/ml, and the limits of quantitation (LOQ) were 8.05 and 16.3 ng/ml for DPZ and TRZ, respectively. This technique was used further to quantify the studied medications in their laboratory‐prepared mixtures, commercial tablets and spiked plasma samples. The results obtained were not significantly different from those acquired from the comparison methods, indicating the high accuracy and precision of the proposed method. Furthermore, the ecological friendliness of the suggested method was evaluated and proven to be excellent using Green Analytical Procedure Index (GAPI) and Analytical GREEnness (AGREE) evaluation tools.
Structure‐Based Design of Ultrapotent Tricyclic Ligands for FK506‐Binding Proteins
Authors: Krajczy Patryk , Meyners Christian , Repity Maximilian L. , Hausch Felix 
Published: June 2024

AbstractAccess to small, rigid, and sp3‐rich molecules is a major limitation in the drug discovery for challenging protein targets. FK506‐binding proteins hold high potential as drug targets or enablers of molecular glues but are fastidious in the chemotypes accepted as ligands. We here report an enantioselective synthesis of a highly rigidified pipecolate‐mimicking tricyclic scaffold that precisely positions functional groups for interacting with FKBPs. This was enabled by a 14‐step gram‐scale synthesis featuring anodic oxidation, stereospecific vinylation, and N‐acyl iminium cyclization. Structure‐based optimization resulted in the discovery of FKBP inhibitors with picomolar biochemical and subnanomolar cellular activity that represent the most potent FKBP ligands known to date.
The ratio of intratumoral CD15+ neutrophils to CD8+ lymphocytes predicts recurrence in patients with gastric cancer after curative resection
Authors: Watanabe Junichiro , Kimura Takashi , Saze Zenichiro , Sato Naoya , Kofunato Yasuhide , Ishigame Teruhide , Okada Ryo , Kenjo Akira , Kono Koji , Marubashi Shigeru 
Published: June 2024

AbstractBackgroundAn elevated neutrophil‐to‐lymphocyte ratio (NLR) in peripheral blood is an independent prognostic indicator of various cancers.AimsIn this study, we aimed to investigate the prognostic relevance of the intratumoral immune cell balance in gastric cancer.Methods and ResultsThe study included 82 patients who underwent curative resection for gastric cancer. The intratumoral cluster of differentiation (CD) 15‐ and CD8‐positive cells were evaluated using immunohistochemical staining. Additionally, clinicopathological factors and prognoses were analyzed. Patients with high intratumoral CD15/CD8 ratios had significantly lower overall survival (OS) and relapse‐free survival (RFS) compared to those with low CD15/CD8 ratios (p = .0026 and p < .0001, respectively). Additionally, a high CD15/CD8 ratio was associated with lymph node metastasis (p = .019). Patients with high NLR had a significantly lower RFS than those with low NLR (p = .0050). Multivariate analysis revealed that the intratumoral CD15/CD8 ratio, NLR, and venous invasion were independent prognostic indicators of RFS (CD15/CD8 ratio: p < .001, hazard ratio (HR) = 14.7, 95% confidence interval (CI) = 3.8–56.8; NLR: p = .010, HR = 5.4, 95% CI = 1.5–19.6; venous invasion: p = .005, HR = 7.4, 95% CI = 1.8–29.7).ConclusionIn summary, we found that the intratumoral CD15/CD8 ratio is an independent prognostic factor following gastric cancer resection and its increase is associated with lymph node metastasis and microscopic lymph vessel invasion. Immunological evaluation with additional aspects of innate immunity may be useful in predicting cancer prognosis.
Genetic and immune identification and functional analysis of TRPM8 as a potential biomarker for pancreatic adenocarcinoma proliferation
Authors: Qiao Sen , Wu Fengming , Wang Hongmei 
Published: June 2024

AbstractBackgroundPancreatic adenocarcinoma (PAAD), a member of highly lethal malignant tumors, has a poor outcome and extremely poor prognosis. The transient receptor potential (TRP) superfamily, a group of nonselective cation channels, is capable of influencing cellular functions by regulating calcium homeostasis. In addition, it has been shown that TRP channels can also affect various cellular phenotypes by regulating gene transcription levels and are involved in the development of a variety of malignant tumors.AimsIn order to find new therapeutic targets and biomarkers to improve the clinical prognosis of pancreatic cancer, we performed genetic and immunological characterization of TRP channels in PAAD, as well as related functional and prognostic analyses.Methods and ResultsWe investigated the expression, genetic alterations, methylation levels, and immune infiltration levels of TRP channels in PAAD, and further also analyzed the function of TRP channels in PAAD and their prognostic value for PAAD patients. Our results suggest that TRPM8 may contribute to tumor proliferation by controlling the PI3K‐AKT–mTOR signaling pathway in PAAD.ConclusionAfter careful evaluation of the accumulated data, we concluded that TRPM8 has potential as a prognostic indicator and prospective therapeutic target in PAAD.
IoT based sensor network clustering for intelligent transportation system using meta‐heuristic algorithm
Authors: Malik Aruna , Singh Samayveer , Manju  , Kumar Mohit , Gill Sukhpal Singh 
Published: June 2024

SummaryInternet of Things (IoT) based sensor networks have been established as a pillar in intelligent communication systems for efficiently handling roadside congestion and accidents. These IoT networks sense, collect, and process data on a real‐time basis. However, IoT based sensor network clustering has various energy constraints such as inefficient routing due to long‐haul transmission, hot spot problem, network overhead, and unstable network whenever deployed along with the roadside that affect their architecture. In such networks, clustering techniques play a crucial role in extending the lifespan and optimizing the routes by integrating sensor devices through clusters. Therefore, a meta‐heuristic algorithm for clustering in IoT sensor networks for an intelligent transportation system is proposed. In this work, the seagull optimization algorithm is applied for clustering by considering residual and average energy, node spacing, and distance fitness parameters. Moreover, this work also considers the dynamic communication range of the cluster heads for increasing the stability period and lifetime of the proposed networks. The experiment results demonstrate that the proposed Seagull optimization algorithm for clustering in IoT networks (SOAC‐IoTNs) and Seagull optimization algorithm for clustering in IoT networks with dynamic communication range (SOAC‐IoTNs‐DR) achieve a significant increase in the stability period and network lifetime, with percentage increments of 55.68% and 71.47%, and 10.03% and 88.66% respectively, compared to the existing optimized genetic algorithm for cluster head selection with single static sink (OptiGACHS‐StSS).
Topology derivation and control method of high‐reliability buck‐boost double‐grounded transformerless three‐phase inverters
Authors: Yao Zhilei , Yang Mengwei 
Published: June 2024

SummaryAs the traditional transformerless three‐phase (TTP) inverters have the shoot‐through and common mode leakage current (CMLC) problems, as well as not being able to realize the buck‐boost conversion, topology derivation and control method of high‐reliability buck‐boost double‐grounded TTP inverters are proposed. These topologies consist of two‐port or three‐port converters with boost capability and three dual‐buck inverters. The two‐port or three‐port converters with boost capability provide the positive and negative bus voltages for the three dual‐buck inverters, realizing the boost conversion. The dual‐buck inverters address the shoot‐through problem. The double‐grounded structure is used to solve the CMLC problem. Dead time between switches is not needed, which reduces the complexity of the control system. Detailed topology derivation of the dual‐buck double grounded TTP inverters with boost capability is given. The operating principle, parameters design of the filters, and stability analysis of this inverter are analyzed in detail. Loss analysis of the inverter is given. The simulation and experimental results of a 750‐W TTP inverter are used to verify the theoretical analysis.
Potential diagnostic and distinguishing roles of microneedle‐based biosensors in bacterial and aseptic meningitis
Authors: Sadeghi Hamid , Gheibi Nematollah , Aslanimehr Masoumeh , Khoei Saeideh Gholamzadeh , Badri Milad 
Published: June 2024

AbstractMeningitis, which is defined by inflammation of the meninges, is a major cause of death and morbidity worldwide. Traditional diagnostic approaches, such as imaging procedures and the study of cerebrospinal fluid, are intrusive, time consuming and sometimes non‐specific. The suggested approach entails creating a biosensor based on microneedles that can detect in real time without the requirement for labels. The biosensor uses highly sensitive detection techniques to detect changes in ionic current and modulation of impedance in response to biomolecules that are of interest, such as proteins and nucleic acids, which are linked to meningitis infections. Initial studies have shown that the microneedle‐based biosensor for meningitis diagnosis is both feasible and effective. When it comes to identifying bacterial and aseptic meningitis biomarkers from blood and cerebrospinal fluid (CSF) samples, the biosensor showed excellent sensitivity and specificity. This novel technique has the potential to enhance patient outcomes by facilitating prompt intervention and tailored therapy by offering a quick, safe and accurate way to distinguish between bacterial and aseptic meningitis. To maximise the biosensor's performance and confirm its therapeutic usefulness in various contexts, more investigations and advancements are necessary.