bluuebunny/crossref_metadata_2025_split huggingface dataset:
Identification and biotechnological characterisation of yeast microbiota involved in spontaneous fermented wholegrain sourdoughs
Authors: García‐Béjar Beatriz , Fernández‐Pacheco Pilar , Carreño‐Domínguez Javier , Briones Ana , Arévalo‐Villena María 
Published: July 2023

AbstractBACKGROUNDNew strategies in the cereal‐based industry has brought about the elaboration of new sourdoughs with better microbial stability and safety as well as nutritional value such as those based on wholegrain flours. This has led to an increasing interest in the selection of adapted yeasts for using them as new starters. Therefore, this study aimed to isolate, identify, and characterise diverse yeast strains from wholegrain spontaneous sourdoughs.RESULTSThree wholegrain sourdoughs (wheat, rye, and oat) were fermented and monitored for 96 h. Minimum pH values ranged from 3.1 to 3.5 while maximum yeast counts were reached at 72 h. A total of 76 yeast isolates were identified by polymerase chain reaction random amplification of polymorphic DNA (PCR‐RAPD) and catalogued in six different species by sequencing the internal transcribed spacer (ITS) region. The major species were Candida glabrata, Saccharomyces cerevisiae, Kazachstania unispora, and Wickerhamomyces anomalus. The studied kinetic parameters of the growth curves (λ, G, ODmax, and μmax) and the fermentation capacity allowed to ascertain that 12 and 5 strains, respectively, were better than baker's yeast control. The fibre assimilation ability (cellulose, xylose, and β‐glucan) was observed in the 27% of the strains and only four strains showed phytase activity.CONCLUSIONSThe yeast population in the three wholegrain sourdoughs were variable along the fermentation time. Genetic identification showed that strains and species presented a different trend for each sourdough although common species were determined (e.g., W. anomalus). Candida glabrata (4T1) and Saccharomyces cerevisiae (3A6) showed, respectively, better kinetics and impedance results than the positive control, while W. anomalus (C4) was notorious in fibre assimilation and phytase degradation. © 2023 The Authors. Journal of The Science of Food and Agriculture published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
Learning healthcare systems in cardiology: A qualitative interview study on ethical dilemmas of a learning healthcare system
Authors: Laurijssen Sara , van der Graaf Rieke , Schuit Ewoud , den Haan Melina , van Dijk Wouter , Groenwold Rolf , le Sessie Saskia , Grobbee Diederick , de Vries Martine 
Published: July 2023

AbstractBackgroundImplementation of an LHS in cardiology departments presents itself with ethical challenges, including ethical review and informed consent. In this qualitative study, we investigated stakeholders' attitudes toward ethical issues regarding the implementation of an LHS in the cardiology department.MethodsWe conducted a qualitative study using 35 semi‐structured interviews and 5 focus group interviews with 34 individuals. We interviewed cardiologists, research nurses, cardiovascular patients, ethicists, health lawyers, epidemiologists/statisticians and insurance spokespersons.ResultsRespondents identified different ethical obstacles for the implementation of an LHS within the cardiology department. These obstacles were mainly on ethical oversight in LHSs; in particular, informed con sent and data ownership were discussed. In addition, respondents reported on the role of patients in LHS. Respondents described the LHS as a possibility for patients to engage in both research and care. While the LHS can promote patient engagement, patients might also be reduced to their data and are therefore at risk, according to respondents.ConclusionsViews on the ethical dilemmas of a LHSs within cardiology are diverse. Similar to the literary debate on oversight, there are different views on how ethical oversight should be regulated. This study adds to the literary debate on oversight by highlighting that patients wish to be informed about the learning activities within the LHS they participate in, and that they wish to actively contribute by sharing their data and identifying learning goals, provided that informed consent is obtained.
Influence of TiC addition on high‐temperature oxidation in rich pO2 atmosphere on Cr‐rich stainless steel
Authors: Wu Qianlin , Tao Yi , Dudziak Tomasz , Sun Kai , Du Hailiang , Fan Runhua , Fan Chunhua , Zhong Ning 
Published: July 2023

AbstractIn this study, the effect of TiC on the oxidation resistance of 304 stainless steel (304SS) at 650°C in air was investigated by examining oxidation kinetics and surface and cross‐sectional scale microstructures, in comparison with TiC‐free alloy. It was found that TiC addition deteriorated the oxidation resistance of 304SS at 650°C, in contrast with its improving effect on oxidation resistance at 850°C reported before. The variation of the TiC effect on the oxidation resistance of 304SS at different temperatures was attributed to the dual effect of TiC where the final results depended on if protective or nonprotective oxide scale formation occurred in TiC‐free 304SS materials.
Unbounded operators having self‐adjoint, subnormal, or hyponormal powers
Authors: Dehimi Souheyb , Mortad Mohammed Hichem 
Published: July 2023

AbstractWe show that if a densely defined closable operator A is such that the resolvent set of A2 is nonempty, then A is necessarily closed. This result is then extended to the case of a polynomial . We also generalize a recent result by Sebestyén–Tarcsay concerning the converse of a result by J. von Neumann. Other interesting consequences are also given. One of them is a proof that if T is a quasinormal (unbounded) operator such that is normal for some , then T is normal. Hence a closed subnormal operator T such that is normal is itself normal. We also show that if a hyponormal (nonnecessarily bounded) operator A is such that and are self‐adjoint for some coprime numbers p and q, then A must be self‐adjoint.
Existence of positive ground state solutions for the coupled Choquard system with potential
Authors: Chen Jianqing , Zhang Qian 
Published: July 2023

AbstractIn this paper, we study the following coupled Choquard system in :
where and , in which denotes if and if . The function is a Riesz potential. By using Nehari manifold method, we obtain the existence of a positive ground state solution in the case of bounded potential and periodic potential, respectively. In particular, the nonlinear term includes the well‐studied case and , and the less‐studied case and . Moreover, it seems to be the first existence result for the case .
Upper semicontinuity of pullback D$\mathcal {D}$‐attractors for nonlinear parabolic equation with nonstandard growth condition
Authors: Zhang Jiangwei , Liu Zhiming , Huang Jianhua 
Published: July 2023

AbstractThis paper is devoted to the well‐posed problem and the existence of pullback ‐attractors for a class of nonlinear parabolic equation with nonstandard growth condition. First, by making use of Galerkin's method and monotone operator method, the existence of solutions is proved in Orlicz–Sobolev space with variable exponents depending on time and space, then the uniqueness and continuity of solutions are also obtained. Finally, by verifying the pullback ‐asymptotic compactness, the existence of pullback ‐attractors is proved. In particular, the upper semicontinuity of pullback ‐attractors of the corresponding equation with respect to the disturbance parameter λ is also proved.
Carleson and sampling measures on Bernstein spaces on Siegel CR manifolds
Authors: Calzi Mattia , Peloso Marco M. 
Published: July 2023

AbstractIn this paper, we introduce and study Carleson and sampling measures on Bernstein spaces on a class of quadratic CR manifold called Siegel CR manifolds. These are spaces of entire functions of exponential type whose restrictions to the given Siegel CR manifold are ‐integrable with respect to a natural measure. For these spaces, we prove necessary and sufficient conditions for a Radon measure to be a Carleson or a sampling measure. We also provide sufficient conditions for sampling sequences.
Boundedness of bilinear pseudo‐differential operators with BS0,0m$BS^{m}_{0,0}$ symbols on Sobolev spaces
Authors: Shida Naoto 
Published: July 2023

AbstractIn this paper, bilinear pseudo‐differential operators with symbols in the bilinear Hörmander class are considered. In particular, the boundedness of these operators on Sobolev spaces is established. Our main result is proved by using symbolic calculus and the boundedness of those operators with certain S0, 0‐type symbols on Lebesgue spaces.
Transference and restriction of Fourier multipliers on Orlicz spaces
Authors: Blasco Oscar , Üster Rüya 
Published: July 2023

AbstractLet G be a locally compact abelian group with Haar measure and be Young functions. A bounded measurable function m on G is called a Fourier ‐multiplier if
defined for functions in such that , extends to a bounded operator from to . We write for the space of ‐multipliers on G and study some properties of this class. We give necessary and sufficient conditions for m to be a ‐multiplier on various groups such as , and . In particular, we prove that regulated ‐multipliers defined on coincide with ‐multipliers defined on the real line with the discrete topology D, under certain assumptions involving the norm of the dilation operator acting on Orlicz spaces. Also, several transference and restriction results on multipliers acting on and are achieved.
Norm inequalities for the spectral spread of Hermitian operators
Authors: Massey Pedro , Stojanoff Demetrio , Zarate Sebastian 
Published: July 2023

AbstractIn this work, we introduce a new measure for the dispersion of the spectral scale of a Hermitian (self‐adjoint) operator acting on a separable infinite‐dimensional Hilbert space that we call spectral spread. Then, we obtain some submajorization inequalities involving the spectral spread of self‐adjoint operators, that are related to Tao's inequalities for anti‐diagonal blocks of positive operators, Kittaneh's commutator inequalities for positive operators and also related to the arithmetic–geometric mean inequality. In turn, these submajorization relations imply inequalities for unitarily invariant norms (in the compact case).
Improving the mechanical properties of 3D printed GelMA composite hydrogels by tannic acid
Authors: Zhang Xue , Yang Xiong , Wu Wenbi , Jiang Xuebing , Dong Yingchu , Yang Shuai , Gou Maling 
Published: July 2023

AbstractThe lack of advanced biomaterials is a major challenge in bio‐printing. Gelatin‐methacryloyl (GelMA) hydrogel, as one of the most commonly used biomaterials in 3D printing, has limited the applications of medicine because of its low mechanical properties. In this study, to enhance the mechanical strength of GelMA hydrogels, we prepared a composite hydrogel based on F127 diacrylate (F127DA) and GelMA, followed by lyophilization and tannic acid (TA) treatment. In this composite hydrogel, the F127DA could self‐assemble into nanomicelles as crosslinking centers for monomer polymerization, which provides additional energy dissipation in hydrogels due to the synergistic deformation of micelles and internal rearrangement of physical binding. After lyophilization of the composite hydrogel, the porous hydrogel was formed. The subsequent treatment of TA could diffuse into the inner of the hydrogel and react with the hydrogel via hydrogen bonds, resulting in the significant enhancement of mechanical properties. The maximum tensile deformation of the obtained hydrogel was about 11 times higher than that of GelMA. This work demonstrates a method to enhance the mechanical properties of 3D‐printed GelMA hydrogel with promising application in bioprinting.
Clinical characteristics and influencing factors of hypoglycemia in hospitalized patients with type 2 diabetes mellitus: A cross‐sectional study
Authors: Li Meng , Zhao Meng , Yan Huan , Guo Hui , Shi Bingyin 
Published: July 2023

AbstractAimAnalysed clinical characteristics and influencing factors for hypoglycemia in hospitalized patients with type 2 diabetes mellitus (T2DM), and providing a scientific reference for precision nursing care of hypoglycemia in hospitalized patients with T2DM.DesignA cross‐sectional study.MethodsThis study involved 378 hospitalized patients diagnosed with T2DM who have suffered hypoglycemia. Through questionnaires and electronic medical records to obtain the data concerning the general information, clinical symptoms, all recorded blood glucose information, and the diabetes knowledge and self‐management level of the patients. The clinical characteristics and influencing factors for hypoglycemia were analysed on the basis of the classification of hypoglycemia published by the American Diabetes Association in 2020.ResultsAmong 378 patients, 207 patients (54.76%) were experiencing Grade 1 hypoglycemia and 171 patients (45.24%) were experiencing Grade 2 hypoglycemia. Hypoglycemia and Grade 2 hypoglycemia in patients with T2DM occurred predominantly within the first 3 days of hospitalization. Hypoglycemia occurred most frequently after breakfast (74 cases, 19.6%), of which Grade 1 hypoglycemia and Grade 2 hypoglycemia accounted for 50%, respectively. Multivariable logistic regression identified risk factors for Grade 2 hypoglycemia in hospitalized patients with type 2 diabetes: older age, longer duration of diabetes, low body weight, diabetic nephropathy stages 4–5, diabetic autonomic neuropathy, inadequate self‐management ability and diabetes knowledge, and lower educational background.ConclusionsHypoglycemia in type 2 diabetes occurs in the first 3 days during the hospitalization and most often after breakfast during the full day. Identifying high‐risk individuals and providing a scientific reference for precision nursing care of hypoglycemia in hospitalized patients with T2DM.
Viscoelastic behavior of jute fiber reinforced composite filled with ceramic particles after water aging
Authors: Wang Xiaomeng , Zhang Jiawei , Wu Qian , Yang Tao , Petrů Michal 
Published: July 2023

AbstractDue to the special multi‐layered structure of plant fiber, jute fiber reinforced composite is sensitive to water. Its mechanical properties will be significantly decreased after water aging. In this paper, alumina ceramic particles are added into jute fiber reinforced composite to improve its water aging resistance and viscoelastic properties. Effects of temperature, vibration frequency and loading time on the viscoelastic properties of the composite before and after water aging are measured. Reversible and irreversible performances degradation caused by water aging is investigated. The results show that ceramic particles can effectively improve the viscoelastic properties of the composite. The storage modulus and relaxation modulus of the composite increase with the particle content, but the strength decreases due to the stress concentration caused by the particles. Therefore, filler content between 10%–30% is more suitable. It is also noticed that its mechanical properties partially recover after redry. Plasticization of the matrix can be reversed after water is removed, but hydrolysis of the matrix and interface damage are irreversible. In addition, a practical Fractional Differential Kelvin Model is established to predict the viscoelastic behavior of jute fiber reinforced composite filled with alumina ceramic particles, and the fitting results agree well with test data.
Microwave‐assisted molding of sisal/HDPEcomposites: Water absorption, diffusion kinetics and tribological behavior
Authors: Naik Tejas Pramod , Gairola Sandeep , Singh Inderdeep , Sharma Apurbba Kumar 
Published: July 2023

AbstractRecyclability and environmental safety have prompted research toward clean and energy‐efficient manufacturing technologies for natural fiber‐reinforced composites. In the current investigation sisal/HDPE composites were fabricated using a novel energy and time efficient microwave‐assisted molding (MAM) method. Sisal fibers were successfully treated with novel microwave‐assisted alkali treatment (MAAT) at 640 W microwave power. For the outdoor application the effect of treatment method on mechanical properties, water absorption, and tribological behavior of the developed composites were studied. The treated composites have been found to absorb less water by 45.28% as compared to untreated (UT). The developed composites recorded increase in tensile strength (36.5%), flexural strength (41.05%), and hardness (4.38%) as compared to UT composites, which could be attributed to effective partial removal of non‐cellulosic content after treatment from fiber surface. During the wear test, sisal/HDPE composite was employed as a pin, and the abrasive paper (P1000) served as a counter surface in the pin‐on‐disc (POD) arrangement for two‐body abrasive wear. The SWR, COF, and friction force values of the treated composites reduced by about 61.72%, 33.33%, and 34%, respectively, as compared to those for the UT composites at minimum normal load (10 N) and sliding speed (0.5 m/s) which was due to positive effect of MAAT. Scanning electron microscope was used to examine the worn surface of composites to understand the mode of wear mechanism.HighlightsNovel microwave‐assisted alkali treatment (MAAT) was used for treatment of fibers.MAAT increased the fiber roughness.Microwave‐assisted molding was used for fabrication of composites.The water absorption behavior followed the Pseudo Fickian diffusion mechanism.Polymeric composites with MAAT fiber had optimum performance.
Exploration of impact response and damage mechanism of discontinuous CFRP laminates subjected to low velocity impact
Authors: Xiao Lin , Lu Chunrui , Li Xiaodan , Xu Nuo , Zheng Ting , Wang Guanhui , Wang Xiaodong , Zhang Dongxing 
Published: July 2023

AbstractCarbon fiber‐reinforced polymer composites (CFRPs) are widely used in many fields because of their excellent mechanical properties; however, they are very sensitive to low velocity impact. A new‐type biomimetic structure, which has a “bricks‐and‐mortar” arrangement of nacre from mollusk shells, was designed and manufactured for enhancing the impact resistance of the CFRPs. The impact response and absorption of impact energy of this structure were also investigated. Impact damage forms of the biomimetic structure were analyzed based on the surface and internal morphologies. The results indicate that biomimetic structure can decrease the impact damage of the CFRPs. Two damage behaviors of the biomimetic structure were observed under relatively higher impact energy. The discontinuous structure reduces the damage using a smaller load for the first damage and a larger deformation for the second damage, which improves the impact resistance of the CFRPs. The discontinuous structure restrains longitudinal crack propagation to a certain extent, effectively reducing the damaged area of the CFRPs. Thus, the proposed structure can increase the strength retention rate of the material by about 5%. In addition, the compression after impact damage modes of CFRPs with three types of structure are summarized and classified originally.
Regulating the temperature‐sensing behavior of poly(lactic acid) by incorporating multiwalled carbon nanotubes and graphene nanoplatelets
Authors: Zhao Zhongguo , Xue Rong , Mi Dashan , Chen Chengzhi , Wang Chouxuan , Zhang Xin , Zhou Shengtai 
Published: July 2023

AbstractIn this work, the synergistic effect of using multiwalled carbon nanotubes (CNTs) and graphene nanoplatelets (GNPs) to regulate the temperature response of electrical conductivity (σ) for poly(lactic acid) (PLA) composites were reported. The addition of CNTs into PLA/GNPs composites markedly enhanced their crystallization capacity and σ, resulting in a reduction of percolation threshold from 2.87 (for PLA/GNPs) to 0.39 wt% (for PLA/GNPs/CNTs), which is attributed to the formation of a three‐dimensional conductive network within PLA consisting of CNTs and GNPs. Furthermore, elevating the heat treatment temperature from 80 to 140°C resulted in a reduced response time of PLA/CNTs/GNPs composites from 57 to 43 s at the Tend of 140°C. Notably, the combined use of CNTs and GNPs considerably amplified the value and stability of max . For example, the maximum increased from 120% for PLACNT0.6 to 240% for PLA/(CNT1/GNP1)0.6. The suppression of volume expansion of PLA led to a negative temperature coefficient (NTC) effect at relatively low temperatures, resulting in a reduction of NTC transition temperature from about 160 to 110°C. Additionally, the PLA/(CNT1/GNP1)0.6 exhibited a swift and sensitive response to temperature fluctuations in various heating scenarios, which demonstrated a potential for use as a thermosensitive material with fast response and temperature‐sensing ability.Highlights
PLA‐based composites with NTC effect was prepared by adding CNTs and GNPs.
The transition temperature from PTC to NTC effect decreased by adding hybrid fillers.
The addition of hybrid CNTs and GNPs favored the formation of conductive network.
The mechanism for NTC transition was explained.
The influence of Scutellaria baicalensis extract obtained from traditional Chinese herbal medicine on the thermo‐oxidative degradation and stabilization of plasticized polylactic acid
Authors: Zhang Jie , Kong Zhe , Li Xiangyao , Zhang Chuang , Xu Kaijun , Cheng Guiqing , Wang Zhongwei , Yu Qing 
Published: July 2023

AbstractDespite the advantage of biodegradability, polylactic acid (PLA) has some processing and application drawbacks, such as poor thermal oxygen stability. Herein, the modified PLA samples were prepared by mixing PLA granules, acetyl tributyl citrate (ATBC), and Scutellaria baicalensis extract (SBE) obtained from traditional Chinese herbal medicine. Results revealed that the introduction of SBE improves the thermal oxidation stability of PLA‐ATBC matrix. When the content of SBE was 2.0 wt%, the oxidation onset temperature value of the modified sample is increased by 68°C versus PLA‐ATBC. The excellent antioxidant performance is attributed to the outstanding free radical quenching capacity of SBE. The introduction of SBE slightly decreased the degradation rate of PLA‐ATBC in an enzyme degradation process, which may be due to the SBE reducing the enzyme activity. Moreover, the addition of small amounts of SBE into the PLA‐ATBC matrix has little influence on polymer crystallization behavior, just decreased by ca. 8.6% (PLA‐ATBC‐SBE2.0 sample). SBE has no obvious effect on the water vapor permeability and surface wettability of PLA‐ATBC membranes. All results reveal that the SBE could play a role in the thermal oxygen stability of PLA‐ATBC without much change in its other performances.