bluuebunny/crossref_metadata_2025_split huggingface dataset:
Essential oil of Syzygium boisianum (Gagnep.) Merr. & L.M.Perry: Chemical compositions, antimicrobial activity, and molecular docking
Authors: Huong Le Thi , Chung Nguyen Thi , Duc Dau Xuan , Dai Do Ngoc , Hai Pham The , Son Ninh The 
Published: March 2024

AbstractEssential oil obtained from hydrodistillation of the Vietnamese Syzygium boisanum leaves was analyzed by the GC/FID‐MS (gas chromatography/flame ionization detection‐mass spectrometry). Forty‐five compounds (90.08%) were namely identified, in which sesquiterpene hydrocarbons (73.07%) were the major chemical class. Among identified compounds, β‐caryophyllene (18.21%) and bicyclogermacrene (25.47%) were the principal compounds. This essential oil was comparable with the positive control streptomycin in an antimicrobial assay against three Gram‐positive bacteria Enterococcus faecalis ATCC299212, Staphylococcus aureus ATCC25923, and Bacillus cereus ATCC14579. Docking study of two major sesquiterpene hydrocarbons β‐caryophyllene and bicyclogermacrene against bacterial DNA gyrase B showed that these two compounds mainly interacted with hydrophobic residues at the rim of the pocket, thereby they are possible inhibitors.
Chemical constituents and biological activities of the seed essential oil from Michelia tonkinensis grown in Thanh Hoa province, Viet Nam
Authors: Bach Pham Cao , Tuyen Tran Thi , Nghi Do Huu , Bich Hoang Thi , Vien Trinh Anh , Quan Pham Minh , Toan Tran Quoc , Thuy Dinh Thi Thu , Thuy Nguyen Thi , Inh Cam Thi , Minh Pham Thi Hong , Van Nguyen Thi Hong 
Published: March 2024

AbstractEssential oils (EOs) from the seed of Michelia tonkinensis were extracted in four ways hydrodistillation (HD), microwave‐assisted hydrodistillation (MHD), ultrasound‐assisted hydrodistillation (UHD) and enzyme‐assisted hydrodistillation (EHD). The chemical constituents of these EOs were analysed by gas chromatography (GC‐FID) and gas chromatography/mass spectrometry (GC/MS). Phenylpropanoids were the main components in which safrole is the dominant constituent (82.98‐91.53%), followed by monoterpene hydrocarbons (5.26‐11.94%). In comparison with traditional hydrodistillation method (HD only), the EOs obtained from the MHD, UHD and EHD methods have the higher safrole contents (91.32%, 90.96% and 90.25%, respectively). The essential oils were also tested for their antioxidant, anti‐imflammatory, antimicrobial and cytotoxic activities. The HD essential oil sample showed inhibitory activity against 6/8 tested microorganisms, i.e., Staphylococcus aureus, Pseudomonas aeruginosa, Escherichia coli, Bacillus subtillis, Candida albicans, and Saccharomyces cerevisiae. The MHD and EHD exhibited the inhibitory activity against three strains E. coli, A. niger and F. oxysporum. The UHD inhibited E. coli and F. oxysporum.
Discovery of novel thiazole derivatives as anti‐breast cancer agents (MCF‐7) and validation of homologous effects on SARS‐CoV‐2 virus using in silico approaches
Authors: Quang Nguyen Minh , Linh Bui Thi Trieu , Uyen Tran Tu , Ngoc Vu Thi Bao , Hoa Tran Thai , Van Tat Pham 
Published: March 2024

AbstractThe development of new drugs with activity against breast cancer (MCF‐7) and SARS‐CoV‐2 based on new thiazole derivatives is still of great interest to many scientists. In silico models have been successfully used to orient the design of novel substances, predict IC50 activity, and screen 12 newly designed derivatives of TAZD. The predictive quality of the QSAR models are shown in the statistical values R2train = 0.945, Q2LOO = 0.919, and SE = 8.40 for QSARMLR, and the statistical values R2 = 0.984, Q2test = 0.985, and Q2CV = 0.996 for the QSARANN I(8)‐HL(10)‐O(1) models. The PPI interaction network pharmacological model was used to screen and evaluate the specific effects of TAZDs on target proteins for breast cancer and SARS‐CoV‐2. The obtained TAZD derivatives were consistent in drug‐likeness according to the Lipinski principle. The compound TAZD8 has good inhibitory potential for the 1R42‐PDB protein of breast cancer cells MCF‐7 and the SARS‐CoV‐2 virus. The compound TAZD8 has the ability to strongly bind to the middle region of two proteins, ACE2‐PDB and 6LU7‐PDB. Therefore, thiazole‐based TAZD8 was found to be a derivative with good potential inhibitory activity against Mpro SARS‐CoV‐2 and the 1R42‐PDB protein for breast cancer MCF‐7.
Magnetic molecularly imprinted polymer for trace pharmaceutical analysis: Preconcentration and the electrochemical determination of sufentanil in biological fluids
Authors: Abedi Hamid , Roostaie Ali 
Published: March 2024

AbstractA magnetic molecularly imprinted electrochemical sensor was developed for selective determination of sufentanil (SUF) based on carbon paste electrode (CPE) modified with methacrylic acid‐ethylene glycol dimethacrylate‐coated Fe3O4 nanoparticles (Fe3O4@MAA‐EGDMA NPs). The structural properties, chemical structure, and electrochemical behaviors of the imprinted sensor were characterized by X‐ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FT‐IR), and square wave voltammetry (SWV), respectively. The prepared sensor revealed admirable recognition ability and selectivity for sufentanil. The substantial variables affecting the performance of extraction and SWV were considered and optimized by the batch mode experiment. Under optimal conditions, the method was capable of determining SUF in the range of 1.0×10‐9 to 6.0×10‐8 mol L‐1. The limit of detection (LOD) of sufentanil was found to be 0.2×10‐9 mol L‐1 (n = 10). The accuracy of the method was studied by recovery measurements on spiked samples. Admirable recovery results (96.0‐102.5%) with satisfactory relative standard deviation (RSD) were attained. According to the obtained results, the present method has high selectivity and reliability for the preconcentration and determination of sufentanil in various biological samples, including urine and plasma, without the use of sample pretreatments.
Electronic and optical properties of metal decorated graphitic carbon nitride M/g‐C3N4 (M = K, Ca, Ga, Ni, Cu): A theoretical study
Authors: Be Pham Thi , Trinh Bui Cong , Van Thuc Nguyen , Ha Nguyen Ngoc , Ha Nguyen Thi Thu 
Published: March 2024

AbstractThe influence of single metal doping (K, Ca, Ga, Ni, Cu) on the electronic and optical characteristics of graphitic carbon nitride (g‐C3N4) was explored utilizing a semi‐empirical tight‐binding‐based quantum chemistry technique (GFN2‐xTB). The calculated results of interaction energy, analyzing the charge transfer, and the bond order revealed that chemical bonds were formed between the metal atom and g‐C3N4. Furthermore, the bond formation between doped metal atoms with g‐C3N4 is predominantly covalent, except for K. The fractional occupation density analysis of the M/g‐C3N4 systems shows different distributions of active electrons across the material systems. The frontier molecular orbitals (HOMO, LUMO) distribution utilized to assess the photogenerated electron and hole recombination of the catalytic systems. Due to the efficient separation of the photogenerated electron‐hole pairs, Ni/g‐C3N4 exhibits the highest photocatalytic activity among the studied systems. On the basis of more extensive electronic and optical property calculations including ionization potential, electron affinity, global electrophilicity index, band gap energy, and UV‐VIS spectra, the Ni/g‐C3N4 photocatalyst's high activity can be explained and interpreted.
Assessment of marine antifouling property of fluoropolymer nanocomposite coating on steel substrate ‐ A preliminary assay in laboratory
Authors: Thai Nguyen Xuan , Chinh Nguyen Thuy , Quan Vo An , Hung Dao Phi , Hiep Nguyen Anh , Dung Hoang Tran , Khanh Hoang Dinh , Hoang Thai 
Published: March 2024

AbstractThis paper presents the results of immersion assay on antifouling performance of a fluoropolymer nanocomposite coating on the steel substrate using natural seawater medium in laboratory. The fluoropolymer nanocomposite coating was composed in the presence of reinforcement additives, including organically modified titanium dioxide (m‐TiO2), organically modified zirconium dioxide nanoparticles (m‐ZrO2) and antifouling agent of Cu2O nanoparticles and fluoropolymer. The ratio of m‐TiO2/m‐ZrO2/Cu2O was fixed at 2/2/5 wt.% in comparison with the fluoropolymer weight. The immersion test was applied to evaluating the antifouling performance of the nanocomposite coating in the natural seawater and has been carried out in dynamic condition at the room temperature of 30 ± 0.1 oC during 60 days of testing. The change in characteristics of the nanocomposite coating was observed and recorded weekly including contact angle, color of coating and the released Cu ions content. Other characteristics such as infrared spectroscopy, surface morphology, abrasion resistance and adhesion of the nanocomposite coating were analyzed before and after testing. The obtained results showed that Cu ions could release with a low rate from the nanocomposite coating when rising immersion time and the release of Cu ions followed a linear equation. The contact angle and gloss of the coating were slightly reduced during testing period, indicating that the smoothness of the coating surface did not change significantly when immersed in natural seawater. The adhesion and abrasion resistance of the coating were almost unchanged after 60‐day testing. In summary, the nanocomposite coating has good antifouling performance when immersion under natural seawater in the laboratory, considering the above specific characteristics, including the synergistic effect of reinforcement fillers (m‐TiO2, m‐ZrO2 nanoparticles) and antifouling agent (Cu2O nanoparticles) in the polymer matrix. This in‐lab experiment in natural seawater medium has confirmed the nanocomposite coating's antifouling performance and facilitated practical deployment.
Development of liposome capped mesoporous silica nanoparticle for anticancer drug delivery
Authors: Nguyen Dinh Tien Dung , Nguyen Ngoc Hoi , Truong‐Thi Ngoc‐Hang , Ching Yern Chee , Nguyen Tan Phu , Nguyen Dai Hai 
Published: March 2024

AbstractMesoporous silica nanoparticles (MSNs) have been used as an anticancer drug delivery system with high safety and entrapment capacity thanks to their large internal space for drug accommodation, durable structure, and good biocompatibility. However, the treatment efficiency of the bare MSNs is limited due to its drug leakage and burst release. In this study, a phospholipid bilayer was covered on the MSNs surface (MSN@Lip) as a liposomal cap that not only reduced drug leakage but also improved the stability of the colloidal system. The chemical structure of MSNs and MSN@Lip was characterized by Fourier transform infrared spectroscopy (FT‐IR) and energy‐dispersive X‐ray spectroscopy (EDX). The particle size and morphology were determined by dynamic light scattering (DLS). The results demonstrated that the MSN@Lip was successfully synthesized with the hydrodynamic diameter and zeta potential of 177.13±1.5 nm and ‐57.57±4.00 mV, respectively. The optimal condition was sonication for 30 minutes at 60°C, with the Lip‐MSNs ratio as 3:1 (w/w). The SEM images showed that MSN@Lip has a spherical shape with high monodispersity. Releasing profile of doxorubicin (DOX) indicated that the formation of liposomal cap on MSN successfully reduced DOX burst release. The MSN@Lip is a potential delivery material for clinical translation because of colloidal stability, good drug loading content, and sustainable drug release.
Study on enzyme‐assisted extraction of the total phenolic content, vitamin C and antioxidant activity from Beta vulgaris var.rubra
Authors: Giap Vu Dinh , Nhan Ngu Truong 
Published: March 2024

AbstractBeta vulgaris var.rubra (B. vulgaris) is a plant that is widely distributed in Vietnam, which has been shown to contain phytochemical compounds, including: vitamin C, total phenolic content, antioxidant activity and other substances, that can be used to produce antioxidant extracts and positive benefits for human health. Currently, the extraction process of bioactive compounds by popular methods such as mechanical grinding and ultrasonic extraction has been relatively ineffective. Therefore, in this study, enzyme‐assisted extract was used to enhance the yield of these compounds from B. vulgaris. The aim of this work was to study factors affecting the extraction of these compounds from B. vulgaris such as extraction time (min), different enzyme activities per gram of dried B. vulgaris (substrate, U/gds). These results indicate that, these bioactive compounds, including: total phenolic content, vitamin C, and antioxidant activity from dried extract of B. vulgaris were higher than the control sample (enzymes inactivate or without enzyme), under the extraction condition at 50oC, pH 5.0 after 12 hours incubation with Cell/Xyl (at least 20U/gds). Then, the highest efficiency of the total phenolic content, vitamin C, and antioxidant activity obtained were 13.54 mg GAE/gds, 3.12 mg/gds and 84.21%, respectively.
Research Activities at Faculty of Chemical Technology, Hanoi University of Industry ‐ 20 Years of Growth and Development
Authors: Nguyen Tuan Anh , Nguyen The Huu , Pham Van Dong , Vu Minh Tan , Pham Thi Mai Huong 
Published: March 2024

AbstractHanoi University of Industry, with a 125‐year history of construction and development, is the leading institution for training and applied scientific research in Vietnam. It offers a wide range of disciplines, types, and levels of education to produce high‐quality human resources for the country's industrialization, national modernization, and international integration efforts. The university currently boasts over 1,500 staff and lecturers, three campuses covering nearly 50 hectares, and a student population of more than 30,000. Hanoi University of Industry provides multidisciplinary training, providing high‐quality human resources for society. In which, the Faculty of Chemical Technology was established on March 1, 2003, in 20 years of construction and development, the faculty has constantly grown, annually providing the society with many high‐quality human resources, with many fields of study diverse, learning, training: Chemical engineering technology, Environmental engineering technology, Food technology and Pharmaceutical chemistry. Besides, the faculty, students and students of the faculty have made great efforts in training, studying and doing scientific research, achieving many excellent achievements.
Military History and Collective Identity
Authors: Rijnoveanu Carmen-Sorina 
Published: March 2024

AbstractEach country has a national story that forges a sense of identity and – as Patrick Finney put it – while language, religion, culture, and traditions are key elements, war has traditionally been at the core of identity construction, shaping the collective national sentiment and the sense of Self (Finney,Remembering the Road to World War Two: International history, national identity, collective memory. Routledge, 2011).Recently, scholars have increasingly become interested in the way in which war and war experiences frame collective identities. From this perspective war and identity are closely intertwined, and this interactive process can explain not only how identities are created but how they may produce various typologies of warfare practices and states’ conduct. Such a conceptual paradigm provides new windows to a study of past wars but also prepares the ground for a better understating of current or future conflicts.Which role does military history play in the collective identity of nations and other collectives, how does war memory shape the architecture of identity construction, and how does identity-memory dynamics frame states’ strategic thinking? These are the central questions of this text. While the possible answers to such questions depend on multiple variables, there is a broad scholarly consensus that this is an area of research that needs to be further explored, especially in the light of new advancements in the field of cultural and social studies. Wars are fought on two main fronts: on the battlefield and in people’s minds where it maintains an enduring influence that is preserved over generations. The way people remember and memorialize the experiences of war allows us to gain a more comprehensive view on the set of practices, norms, values, and emotions that shape collective identities and determine typologies of state behavior in military and security affairs.
Überblick zu chronobiologischen und schlafmedizinischen Aspekten bei Depressionen im Jugendalter
Authors: Ghotbi Neda , Scherff Aline Doreen , Greimel Ellen , Schulte-Körne Gerd 
Published: March 2024

ZusammenfassungBei Jugendlichen mit Depression werden mit einer Häufigkeit von bis zu 71 % Veränderungen des Schlafes berichtet. In dieser narrativen Übersichtsarbeit werden chronobiologische und schlafmedizinische Aspekte bei Depressionen im Jugendalter basierend auf der aktuellen Forschungsliteratur zusammenfassend dargestellt. Die circadiane Uhr des Menschen ermöglicht die Synchronisierung unseres Organismus mit der Licht-Dunkel-Struktur der Umwelt. Die individuelle Synchronisierung wird als Chronotyp bezeichnet. Der Chronotyp verändert sich u. a. altersabhängig und Jugendliche weisen die spätesten Chronotypen auf. Wenn es durch frühe Schul‑/Arbeitszeiten zu einer Diskrepanz zwischen Chronotyp und Außenzeit kommt, entsteht der sog. soziale Jetlag. Dieser soziale Jetlag tritt im Jugendalter vermehrt auf und ist mit zahlreichen gesundheitlichen Risiken, wie zum Beispiel Depressionen, verbunden. Veränderungen des Schlafes sind im Zusammenhang mit Depressionen gut beschrieben und treten im hohen Maße komorbid zu affektiven Erkrankungen auf. In diesem Artikel werden zu Beginn grundlegende Konzepte der Chronobiologie und schlafmedizinischer Aspekte zusammengefasst. Anschließend werden Gesundheitsrisiken und Zusammenhänge zu Depressionen spezifisch für Jugendliche erläutert, bevor dieser Artikel mit Empfehlungen für die klinische Versorgung bei Schlafstörungen und Depressionen im Jugendalter sowie für weitere Forschungsvorhaben schließt.
Analysis of self-supporting conformal cooling channels additively manufactured by hybrid directed energy deposition for IM tooling
Authors: Wilson Neil , Gupta Manhar , Mazur Maciej , Patel Milan J. , Nguyen Vu , Gulizia Stefan , Cole Ivan S. 
Published: March 2024

AbstractAdditive manufacturing (AM) of injection moulding (IM) tools has attracted significant interest in the polymer manufacturing industry for quite some time. However, hybrid manufacturing (HM) using directed energy deposition (DED), which involves concurrent additive and subtractive manufacture, has not been a commonly used process for IM tooling manufacture. This is apparent despite several advantages over the prevalent laser-powder bed fusion (L-PBF) alternative, including higher build rate, lower cost and integrated machining to directly achieve higher tolerances and surface finish. A key reason for this low utilisation is the limited ability of DED processes to produce circular channel profiles typically used in IM tooling, due to stricter constraints on the manufacturability of overhanging geometry. To address this, a range of self-supporting IM cooling channel profiles suited for hybrid laser and powder-based DED manufacture are proposed in this work. Numerical and experimental evaluations are conducted of the cooling performance of several non-circular conformal cooling channel (NCCC) profiles to identify a profile which achieves the maximum heat transfer for a constant cross-sectional area and coolant flow rate. Experimental studies included AM builds to evaluate the DED manufacturability of the selected NCCC profile on a conformally cooled HM benchmark model, followed by cooling performance characterisation, including a comparison against a reference L-PBF manufactured benchmark model. In conclusion, a shape correcting factor is obtained using response surfaces. This factor is used to convert thermal performance calculations for non-circular profiles to a conventional circular channel profile to simplify the DED manufacturing process for non-circular IM cooling channels.
The Proper Landau–Ginzburg Potential, Intrinsic Mirror Symmetry and the Relative Mirror Map
Authors: You Fenglong 
Published: March 2024

AbstractGiven a smooth log Calabi–Yau pair (X, D), we use the intrinsic mirror symmetry construction to define the mirror proper Landau–Ginzburg potential and show that it is a generating function of two-point relative Gromov–Witten invariants of (X, D). We compute certain relative invariants with several negative contact orders, and then apply the relative mirror theorem of Fan et al. (Sel Math (NS) 25(4): Art. 54, 25, 2019. https://doi.org/10.1007/s00029-019-0501-z) to compute two-point relative invariants. When D is nef, we compute the proper Landau–Ginzburg potential and show that it is the inverse of the relative mirror map. Specializing to the case of a toric variety X, this implies the conjecture of m Gräfnitz et al. (2022) that the proper Landau–Ginzburg potential is the open mirror map. When X is a Fano variety, the proper potential is related to the anti-derivative of the regularized quantum period.
Random Quantum Circuits Transform Local Noise into Global White Noise
Authors: Dalzell Alexander M. , Hunter-Jones Nicholas , Brandão Fernando G. S. L. 
Published: March 2024

AbstractWe study the distribution over measurement outcomes of noisy random quantum circuits in the regime of low fidelity, which corresponds to the setting where the computation experiences at least one gate-level error with probability close to one. We model noise by adding a pair of weak, unital, single-qubit noise channels after each two-qubit gate, and we show that for typical random circuit instances, correlations between the noisy output distribution $$p_{\text {noisy}}$$

p
noisy

and the corresponding noiseless output distribution $$p_{\text {ideal}}$$

p
ideal

shrink exponentially with the expected number of gate-level errors. Specifically, the linear cross-entropy benchmark F that measures this correlation behaves as $$F=\text {exp}(-2s\epsilon \pm O(s\epsilon ^2))$$

F
=
exp
(
-
2
s
ϵ
±
O

(
s

ϵ
2

)

)

, where $$\epsilon $$
ϵ
is the probability of error per circuit location and s is the number of two-qubit gates. Furthermore, if the noise is incoherent—for example, depolarizing or dephasing noise—the total variation distance between the noisy output distribution $$p_{\text {noisy}}$$

p
noisy

and the uniform distribution $$p_{\text {unif}}$$

p
unif

decays at precisely the same rate. Consequently, the noisy output distribution can be approximated as $$p_{\text {noisy}}\approx Fp_{\text {ideal}}+ (1-F)p_{\text {unif}}$$

p
noisy

≈
F

p
ideal

+

(
1
-
F
)

p
unif

. In other words, although at least one local error occurs with probability $$1-F$$

1
-
F

, the errors are scrambled by the random quantum circuit and can be treated as global white noise, contributing completely uniform output. Importantly, we upper bound the average total variation error in this approximation by $$O(F\epsilon \sqrt{s})$$

O
(
F
ϵ

s

)

. Thus, the “white-noise approximation” is meaningful when $$\epsilon \sqrt{s} \ll 1$$

ϵ

s

≪
1

, a quadratically weaker condition than the $$\epsilon s\ll 1$$

ϵ
s
≪
1

requirement to maintain high fidelity. The bound applies if the circuit size satisfies $$s \ge \Omega (n\log (n))$$

s
≥
Ω
(
n
log
(
n
)
)

, which corresponds to only logarithmic depth circuits, and if, additionally, the inverse error rate satisfies $$\epsilon ^{-1} \ge {\tilde{\Omega }}(n)$$

ϵ

-
1

≥

Ω
~

(
n
)

, which is needed to ensure errors are scrambled faster than F decays. The white-noise approximation is useful for salvaging the signal from a noisy quantum computation; for example, it was an underlying assumption in complexity-theoretic arguments that noisy random quantum circuits cannot be efficiently sampled classically, even when the fidelity is low. Our method is based on a map from second-moment quantities in random quantum circuits to expectation values of certain stochastic processes for which we compute upper and lower bounds.