In this paper, an application of fuzzy integral transform to the multi-criteria selection problem is introduced. A type of fuzzy integral on the complete  residuated  lattice space  is considered. Using  this fuzzy integral, a corresponding kind of the fuzzy integral transform for lattice-valued functions through the combination of the integral kernel and the original function as the popular integral transforms, is presented (Fourier, Laplace, Hilbert, etc). In addition, this fuzzy integral introduced here is also used as a new tool to evaluate the criteria for the decision maker's candidates in the multi-criteria selection problem. The proposed method is illustrated and compared with other methods using the personnel selection problem.

In the 3-3-1 flipped model framework, one-loop contributions to loop-induced decays of the Standard model-like Higgs boson h→Zγ, γγ are introduced. The article is to research new contributions from charged Higgs and gauge bosons appearing in the h→Zγ decay amplitude, but these do not affect the h→γγ decay amplitude.

This paper is intended to investigate fuzzy variational problems of several dependent variables with nonholonomic constraints. Firstly, the necessary optimality conditions for fuzzy variational problems with nonholonomic constraints are established. Then, sufficient optimality conditions are obtained under some convexity assumptions.

This study presents the analyses and forecasts of time series data using different machine learning models. Methods used include Holt-Winters, ARIMA, random forest (RF), gradient boosting machine (GBM), and automatic machine learning (AutoML). Advanced grid search methods are also applied to ARIMA, RF, and GBM for model optimization. Monthly water flow data at the Tien River measuring station in Tan Chau, Vietnam, from 1992 to 2021 are used to train and test the models. The results show that the GBM model with advanced grid search has superior accuracy compared to other models.

In this study, a detailed investigation of the electronic, mechanical and optical properties of two novel structures (g-Pnma and p-cubic) of SnS and SnSe are performed and then compared to the basic structure a-Pnma. Via density functional theory, our two novel structures exhibit favorable energetic stability close to the basic structure a-Pnma and good mechanical durability. Band structure and optical properties of the new layered g-Pnma structure demonstrate their potential application in photovoltaic and optical detectors, similar to the conventional a-Pnma structure. Besides, the p-cubic structure can be useful for photovoltaic application.

In this paper, one dimensional simple random walk and conditioned random walk models will be considered. While a random walk is a martingale, the conditional one is a strictly submartingale. Here, we also figured out the martingales generated by the conditional random walk.

This paper investigates the higher order moment analysis of the random walk model in discrete state space. Initially, Jacob-Bernoulli's formula is employed to compute the sum of higher-order powers, facilitating the determination of a partial solution to the Poisson equation associated with the Markov operator P relevant to the studied process. Subsequently, when the properties of conditional expectation are applied and a recursive approach is employed, moments are computed. Lastly, the limit of higher-order moments is determined to attain the desired result.

In this paper, coefficients and indices that can be used to assess the impact of input variables in statistical models are considered. The importance coefficient and sensitivity indices are two quantities that are performed on the polynomial regression model, in which the Monte Carlo approach is used to calculate the sensitivity indicators.

In this research, the density functional theory (DFT) framework was utilized to optimise the structures of two-dimensional (2D) pentagonal palladium diselenide (p-PdSe2) monolayers and multilayers. The binding energy of monolayer and the formation energy of the multilayer are calculated in detail and demonstrate good stability. For monolayer 2D p-PdSe2 the binding energy is -23.53 eV, while the optimized formation energy of the bilayer is stable at -16.92 eV and -25.00 eV for trilayer. The bond lengths also show significant changes after optimization, with an increase in length observed in Pd-Se single bonds. The interlayer distances also exhibit stability after optimization at 3.912 Å, consistent with the interlayer distances of 2D layers experimentally exfoliated multilayers. This suggests the feasibility of synthesizing block materials p-PdSe2  from stacked 2D layers, paving the way for designing electronic components based 2D p-PdSe2 sheets.

This study proposes a classification algorithm for probability density functions (PDFs) which is then applied to image data. The proposed algorithm is detailed step-by-step and illustrated using a specific set of PDFs. For application to image data, the study extracts color features using four basic colors represented as one-dimensional PDFs. Next, the method for finding prior probabilities based on fuzzy cluster analysis techniques is built. Finally, the quasi-Bayesian classification principle is established. Application on a specific set of images shows good classification results and demonstrates significant potential for practical applications across various fields.

This article analyzes the stability and bifurcation of a virus    transmission model in the community. The model is given by a system of ordinary differential equations that depend on parameters. The dynamics of the model are determined by the base reproduction number R0  and the stability of equilibria. The Lyapunov function method is the main tool for proving the global stability of equilibria. Transcritical bifurcation is presented to explain the change in the stability of equilibria. A numerical investigation is carried out to check the theory's correctness. The results obtained explain the mechanism of virus transmission in the community.

The main objective of this paper is to examine a class of stochastic differential equations (SDEs) with coefficients that do not satisfy the Lipschitz condition. First, the basic SDEs along with some important related results are introduced. Next, by combining the truncation method with previous findings, the existence and uniqueness of solutions for a specific class of SDEs with non-Lipschitz drift coefficients are established. Finally, the positivity of the solutions and the boundedness of their moments are investigated.

In many fields, dividing images into clusters can help us classify, identify objects in the images, and detect anomalies. This study proposes a clustering analysis algorithm for images based on the probability density function (PDF) estimated from extracted features. First, any image is converted into four basic colors (red, green, blue, and gray) to extract pixel features at each point. Next, the PDFs representing the extracted features will be estimated to represent the image in recognition. Finally, a fuzzy clustering algorithm for the PDFs is proposed. The algorithm is presented step by step and applied to specific image sets. Numerical results showed that the proposed algorithm is effective and stable, applicable to various fields of reality.

Recognizing a fuzzy composition in reality is an interesting and difficult problem. It is arised in the theory of Fuzzy Mathematics when we extend it to practical problems such as fuzzy control and fuzzy clustering. Those are the problems raised and solved in this article through the basic knowledge of fuzzy association and fuzzy composition that have been researched.

The optoelectronic properties of type II core-crown hexagonal graphene quantum dots doped with vanadium (HBC-xV) were investigated using the density functional theory simulation method. To precisely predict the orbital interactions between the d-orbitals of vanadium atoms, we use Heyd-Scuseria-Ernzerhof as exchange-correlation functional. It was shown that by doping vanadium atoms to these quantum dots, the absorption spectra exhibit remarkable red-shifts towards the visible light range. The absorption mechanism between the core and the crown portions of the dots was also explained. These results highlight the essence of vanadium doped atoms to the electronic and optical properties and enhance the light-to-electricity conversion capacity of these type II core-crown quantum dots.

In this paper, the vector mixed variational inequality is considered, and the stability of the solution is studied in cases where both the objective function and the constraint set are perturbed. The Gerstewitz function is used to establish sufficient conditions for the Hausdorff continuity of the solution mapping of the above problem. An illustrative example is also provided to demonstrate the main results of the paper.

In this article, the p-median problem on a plane is discussed with the Euclidean norm. Additionally, several commonly used heuristic algorithms such as Particle Swarm Optimization (PSO), Grey Wolf Optimizer (GWO), Bat Algorithm (BA), and Cat Swarm Optimization (CSO) are employed to find approximate solutions for the p-median problem on the plane.

In this study, we present a workflow for data-driven materials science discovery using a machine learning (ML) algorithm - an artificial neural network (ANN). The focus is on predicting the energy band gap (Egap) of materials, a key electronic property in solid-state physics. By employing supervised machine learning techniques and a large dataset, the DenseNet model is optimized to accurately predict Egap values. The effectiveness of the DenseNet model is demonstrated through evaluation metrics such as the coefficient of determination (R²), Mean Absolute Error (MAE), and Root Mean Squared Error (RMSE). The results show that the model achieves its best performance with an R² of 0.7924 on the training set and 0.6682 on the validation set. This research not only contributes to the development of efficient computational methods for materials science but also opens up new avenues in the discovery and design of novel materials.

This study proposes a forecasting model for interval time series by splitting it into two point time series. For each point time series, the study normalizes the data, divides it into clusters with the appropriate numbers using the fuzzy clustering technique, establishes fuzzy relationships between elements in the series and clusters, and sets up a forecasting rule. The proposed model details the implementation steps and is illustrated by the numerical example. It is also applied to two real interval series and achieves competitive results compared to other popular models.

Vinh Long is one of the provinces with rapid urbanization that strongly affects vegetation cover. This study uses satellite image data and a multi-resolution wavelet transform method to survey changes in vegetation index in Vinh Long province. The results showed that the average value of the vegetation index for 12 months in 2020 fluctuated between 0.35 - 0.7. Monitoring this fluctuation contributes to the effective use and management of land resources.

The article aims to study basic calculus rules for Studniarski-like’s derivatives for set-valued maps. The article applies definitions of set-valued maps such as convexity, lower semicontinuity, and local pseudo-Lipschitz calmness to imply calculus rules for Studniarski-like’s derivatives such as sum, product, and quotient. The results in the paper are new and are expanded  from previous research results. The calculation formulas in this article can be applied to study solution sensitivity or optimal conditions of set-valued optimization problems.

The research was carried out to develop some existing results on generalized differentiation such as formulas for calculating the Fréchet and Mordukhovich coderivatives of constraint operators and formulas for calculating the Fréchet subdifferential of optimal value functions of a class of parametric optimal control problems with equilibrium constraints. Using these results, the article obtains new results including formulas for calculating the Mordukhovich subdifferential of optimal value functions of the parametric optimal control problem with equilibrium constraints.

In this study, the monolayer graphene nanoribbons (AGNRs) under the influence of vacancy and reconstruction to form a 5-9 ring were calculated. The Tight binding (TB) method is used to investigate the energy bands of the material without and with the presence of an external electric field. Besides, the thermoelectric based on Green’s function formalism is also examined. The results with M = 15 show that the band gap of the material is divided into two gaps located around the Fermi level. Depending on the different defect positions, the gap size is going to change. In particular, under the influence of the transverse electric field, the band gap of the material is controlled, leading to a change in density of states (DOS) and Seebeck coefficient S of the material. Therefore, the combination of defects and external electric fields has great potential to lead graphene materials toward future applications.

This paper concerns the problem of finding a cut which partitions a connected network into two connected components so that the total weighted distance from any vertices of the network to the cut edge(s) is minimized. This problem is called the minisum cut problem. This paper shows that the problem is NP-hard on general networks by reducing the set cover problem to this problem and the problem on trees can be solved in linear time by dynamic programming. 

This paper studies vector equilibrium problems in normed spaces. Firstly, the paper provides sufficient conditions for the closedness of efficient solution sets of reference problems. Subsequently, the paper studies the useful properties of a nonlinear scalarization function in the sense of generalized oriented Hiriart-Urruty introduced in the literature. These properties are utilized to establish sufficient conditions for the upper semicontinuity of efficient solution maps of the considered problems when the data are perturbed. 

The objective of the study was to determine the appropriate concentrations of sucrose and lecithin during cryopreservation of Vietnamese black rabbit sperm. In experiment 1, semen was diluted with Tris Citrate Glucose stored medium supplemented with 15% egg yolk and sucrose at 4 concentrations: 0M, 0.05M, 0.1M and 0.25M. In experiment 2, egg yolks were replaced with lecithin in the stored medium at concentrations: 1%, 1.5% and 2%. The samples was transferred to straws and stored in liquid nitrogen (-196ᵒC). After 72 hours of storage, sperm quality test results showed that 0.05M sucrose combined with 1.5% lecithin helps sperm maintain the best quality with overall motility rate, viablity rate, membrane integrity, acrosome integrity and antioxidant capacity were 56.39%, 63.74%, 49.04%, 64.43%, 20.41%, respectively. This study showed that combining 0.05M sucrose and 1.5% lecithin in cryoperservation is important in breeding and preserving Vietnamese black rabbits.

Ganoderma lucidum is a medicinal mushroom used to strengthen the immune system because it contains many biologically active ingredients. This study aims to evaluate the antioxidant and anti-inflammatory activities of G. lucidum extract grown on two substrates: sawdust and sugarcane bagasse. The results showed that the extract grown on the two substrates showed antioxidant activity on the three testing methods ABTS●+, DPPH and TAC. Among them, the extract from G. lucidum grown on sugarcane bagasse showed the strongest activity with IC50 or Abs0.5 values of 17.94 µg/mL, 935.84 µg/mL, 559.25 µg/mL, respectively. The results showed that the extract from G. lucidum grown on sugarcane bagasse substrate (IC50 = 171.01 µg/mL) has a stronger anti-inflammatory effect than the extract from G. lucidum grown on sawdust substrate (IC50 = 223.97 µg/mL). The above results indicate that Ganoderma grown on sugarcane bagasse has better biological active ingredient content than grown on sawdust.

Watermelon is a fruit rich in L-citrulline, especially in the fruit's skin, which improves heart health, boosts immunity and provides sexual health benefits. UV-Vis spectroscopy method was used to determine the L-citrulline content in the rind and flesh of four different watermelons at a wavelength of 490 nm. As a result, all four kinds of surveyed watermelon had L-citrulline content in watermelon flesh juice ranging from 0.580 to 1.12 mg/g, less than the L-citrulline content in watermelon rind juice (0.76 to 1.28 mg/g) (dwt). The method was validated for specificity, linearity, repeatability and repeatability, accuracy, limit of detection and limit of quantitation. All results in correlation coefficient R2, reliability R and relative standard deviation RSD were required according to AOAC regulations (2016). Therefore, the UV-Vis method can be used to determine L-citrulline content in other natural fruits.

Green macroalgae is a resource that provides rich and diverse biological activities. Among them, C. taxifolia is a species of green algae. In this study, the chemical composition and in vitro antioxidant, anti-inflammatory and antibacterial activities of algal extract were investigated. Quantitative results of total polyphenol content reached 91,49±2,09 mg GAE/g extract, flavonoid content reached 226,00±6,00 mg QE/g extract.. The results of the antioxidant activity studies showed that C. taxifolia  ethanol extract achieved 2.2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging (IC50=11302,33 µg/mL), followed by reduction capacity with the value  of  OD0.5= 780 μg/mL. For anti-inflammatory activity, C. taxifolia extract effectively inhibited albumin denaturation from bovine serum reaching 132,49% at a concentration of 100 µg/mL. C. taxifolia extract showed antibacterial activity against two bacterial strains B. cereus và E. coli with antibacterial diameters of 5,67±0,58 mm and 1,33±0,58 mm respectively at the concentration 40 mg/mL. The results have demonstrated the antioxidant, anti-inflammatory and antibacterial potential of C. taxifolia algae, contributing to creating a scientific basis for the application of algae in food products as well as in medicine.

The study compared the antibacterial effectiveness of extracts from three green-skinned orange varieties (Sanh, Xoan and Mat oranges) and one yellow-skinned orange variety (Navel orange) by soaking and Soxhlet. The antibacterial activity of the extract was evaluated on Bacillus cereus, Staphylococcus aureus, Pseudomonas aeruginosa, Escherichia coli and Candida albicans. In both extraction methods and five microbial strains surveyed, extracts from green-skinned orange varieties have better antibacterial activity than yellow-skinned orange varieties, in which Xoan orange extract has the strongest antibacterial activity. The extract extracted by soaking has higher antimicrobial activity than th at extracted by Soxhlet. In addition, the extracts showed more effective antibacterial properties against Gram-positive bacteria (B. cereus, S. aureus) and fungi (C. albicans) than Gram-negative bacteria (P. aeruginosa, P. aeruginosa, E coli). In summary, the extract of Xoan orange by soaking has the strongest antibacterial properties, especially effective against S. aureus and C. albicans.

The purpose of this study is to quantify the chemical composition and biological activity of extracts from the aerial parts (stem and leaf), stem extract, and leaf extract of Blumea lacera. Antioxidant activity was evaluated using the 2,2-diphenyl-1-picrylhydrazyl, nitric oxide, total antioxidant capacity, ferric reducing-antioxidant power and 2,2-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid). Anti-inflammatory activity was measured by its ability to protect red blood cell membranes and inhibit denaturation of bovine serum albumin. The antibacterial activity was assessed by measuring the antibacterial ring diameter, the minimum inhibitory concentration, and the minimum bactericidal concentration. Blumea lacera leaf extract exhibits stronger antioxidant and anti-inflammatory activities than the other extracts. Blumea lacera extracts inhibit Gram-positive bacteria more effectively than Gram-negative bacteria, with minimum bactericidal doses of 250 to 2000 µg/mL. Blumea lacera extracts have antioxidant, anti-inflammatory, and antibacterial properties due to the presence of polyphenols, flavonoids, and alkaloids. These findings demonstrated the potential of Blumea lacera extracts as natural antioxidants, anti-inflammatory, and antibacterial agents.

Cancer is one of the most serious health issues. In the continuous effort to find effective and safe treatment methods, seeking natural sources of anti-cancer agents is an important direction. In this study, the anti-cancer effects of 7 algae species in Southwest Islands, Vietnam, including Padina boryana Thivy, Sargassum sandie, Sargassum glaucescens, Sargassum plagiophyllum, Turbinaria ornata, Caulerpa cupressoides, and Caulerpa taxifolia, were investigated through a series of experiments., targeting both HepG2 (liver cancer) and MCF7 (breast cancer) cells. All extracts from the 7 algae species exhibited cytotoxic effects against both HepG2 and MCF7 cells (cytotoxic effects >50% at 256 µg/mL). Particularly, the C. cupressoides extract demonstrated potent effects against MCF7 and HepG2 cells, with corresponding EC50 values of 50.67 µg/mL and 144.14 µg/mL, respectively.

The study aims to investigate the chemical composition and assess the α-glucosidase inhibitory potential of stem and leaf extracts of Gymnanthemum amygdalinum against α-glucosidase enzymes derived from two sources: yeast and the small intestines of mice.The chemical composition of the stem and leaf extracts was found to contain alkaloids,  coumarin, polyphenol, tannin, flavonoid, and saponin.  The stem extracts' total polyphenol and flavonoid contents (252.3±1.47 mg GAE/g and 136.7±1.54 mg QE/g, respectively) were higher than the leaf extract. Similarly, the results showed that the stem extract exhibited stronger inhibitory effects on α-amylase (IC50 =124.22±1.83 µg/mL) and α-glucosidase (IC50=77.21±0.52 µg/mL) compared to the leaf extract (IC50=424.22±4.12 µg/mL; IC50=287.51±3.42 µg/mL). Regarding the inhibitory effect on the glucosidase enzymes in the small intestine of mice, the inhibition percentage of the leaf extract was quite low (

In this study, the adsorption of carbon monoxide (CO) on the surface of platinum (Pt) and platinum-ruthenium alloy (PtRu) nanoparticles was investigated by simulation using density functional theory (DFT) and cyclic voltammetry (CV) measurement. The simulation results show that the adsorption energies of CO on Pt and PtRu surfaces are -2.03 and -1.86 eV, respectively. This proves that the CO molecule adsorbed on the Pt surface more strongly than on the PtRu surface. The results of CV measurement also show that the jf/jr ratio of PtRu (7.2) is 2.9 times higher than that of Pt (2.5). This once again confirms that adding ruthenium to platinum will help increase the resistance to CO tolerance. Furthermore, the experimental results are also completely consistent with the simulation results.

Betacyanin is an essential natural colorant to replace synthetic ones due to its durable, non-toxic properties and health-beneficial biological activities. In this study, betacyanin was extracted from dragon fruit peel (Hylocereus undatus) using ethanol and an ultrasonic treatment. The influence of parameters such as ethanol concentration, organic acid type and concentration, pH, temperature, time, and solid-liquid ratio on the extraction efficiency of betacyanin and their color stability in the extract were investigated. The results showed that the best condition for betacyanin extraction was 40% (v/v) ethanol, 0.005 mol/L ascorbic acid, pH 2, 1/20 g/mL solid-liquid ratio, at 40oC, and 20 minutes of ultrasonic time. Under the best extraction condition, the efficiency of betacyanin extraction was 0.472 mg/g and their color decomposition was less than 5% after 24 hours. The betacyanin extract showed antioxidant activity and toxicity to KB epidermoid cancer cells. Thus, with assisted ultrasound waves, betacyanin has been successfully extracted with high and stable extracting efficiency from dragon fruit peels. The dragon fruit peel can be a potential raw material for producing betacyanin, bringing high economic and environmental value.

Eclipta prostrata (L.) L. belonging to the Astearaceae family has been long used by various local communities in the world as traditional medicine. Antioxidant activity of different extracts from Eclipta prostrata (L.) L. revealed that ethyl acetate extract has high activity with the half maximal inhibitory concentration (IC50) of 62.02 and 72.41 µg/mL by DPPH and ABTSŸ+ method. Processing of this fraction using repeated column and thin layer chromatographic techniques resulted in the isolation of two compounds including protocatechuic acid (1), and 6′-O-crotonyleclalbasaponin A (2), which have identified by NMR. Among them, 6′-O-crotonyleclalbasaponin A is isolated first time from this species and protocatechuic acid has good antioxidant activity with the IC50 values of 13.24 and 16.23 mg/mL by DPPH and ABTSŸ+ method, respectively. The results demonstrate the beneficial effects of E. prostrata as an antioxidant and bioactive compound for medicinal usage.

In this study, anti-inflammatory compound was isolated and evaluated from n-hexane extract of Launaea sarmentosa via nitric oxide (NO) radical scavenging activity and the NO inhibition on RAW264.7 macrophages in LPS-stimulated. Results showed that compound 3 (lutein) exerted its activity through NO inhibition with IC50 values of 23,65 and 29,23 μg/mL, respectively. Their chemical structures were determined using 1D, 2D-NMR spectroscopy in comparison with previous studies, including a mixture of stigmasterol and β-sitosterol (1), daucosterol (2), and lutein (3). Besides, lutein is reported  for the first time from L. Sarmentosa.

Tender shoot tea is a type of green tea with a delicate flavor and high quality. The study was conducted to optimize fermentation conditions for kombucha from tender shoot tea by investigating factors affecting the fermentation process, including tea content (0.6-1.0% w/v), starter content (6.0-10.0% w/v), soluble solids content (16.0-20.0°Brix), pH (3.5-5.0). Factors such as temperature (25, 28-32, 35℃) and time (2-14 days) of fermentation were also investigated. The results showed that tea content was 0.8% w/v, starter content was 10% w/v, soluble solids content was 18°Brix, and  pH was 4.34, fermented at room temperature (28-32 ℃) for 8 days were suitable conditions for the primary fermentation (F1) of kombucha to create products with high quality in both physicochemical and organoleptic characteristics.

This paper reports the design and synthesis of the hybrid 1,3,4-oxadiazole/α-amino acid derivatives from commercially available starting materials under microwave irradiation conditions. Five novel derivatives (6a-e) were successfully synthesized in 9-22% total yields. The structures of the synthesized compounds were fully determined based on spectroscopic data, including HR-MS, FT-IR, 1H-NMR, 13C-NMR, HSQC and HMBC.

Periphthalmodon fish in the Mekong Delta have two species, including P. septemradiatus and P. schlosseri. The P. septemradiatus species can live in fresh and brackish water with a small size (SL=86 mm). The P. schlosseri species is distributed in estuaries and coastal areas and is larger (SL=210 mm). The sexes of these two species are easily analyzed based on behavioural characteristics and biological spines. They dig burrows by their mouth and use them as a place to live, hide from predators, hunt, and spawn. Both of these fish species belong to the group of abundant fish during the spawning season with relatively high fecundity. They all belong to the group of carnivores with quite diverse food items. The P. schlosseri population is overexploited, while the P. septemradiatus population is not overexploited.

Momordica charantia var. abbreviata Ser. is a natural medicinal plant with many important bioactive compounds with applications in medicine and life. This study was conducted to determine the content of some compounds in extracts from parts of Momordica charantia var. abbreviata Ser. plant and to evaluate the antibacterial and antioxidant potential of the fruit extract of this plant. Quantitative results showed that there was a clear difference in total phenolic and flavonoid content in the fruit (36,97 and 48,47 mg.g-1 DW, respectively) compared to the stem (25,86 and 64,08 mg.g-1 DW, respectively) and Momordica charantia  leaves (21,49 and 136,27 mg.g-1 DW, respectively). The fruit extract has the ability to resist oxidative radicals such as DPPH free radicals (EC50=4310,15 µg/mL) and iron reduction (EC50=339,17 µg/mL). The extract from the fruit also showed biological activity through its ability to resist bacterial strains Pseudomonas aeruginosa ATCC27853, Staphylococcus aureus ATCC25923, Bacillus subtilis, B. cereus ATCC10876 and Listeria innocua ATCC33090.

The study aimed to identify endophytic bacterial strains in Elephantopus mollis with anti-oxidant and anti-inflammatory properties in vitro. Endophytic bacterial strains’ antioxidant activity was determined using the method of total antioxidant capacity, reducing power, and neutralizing 2,2-diphenyl-1-picrylhydrazyl free radical. The anti-inflammatory activity of endophytic bacterial strains was assessed by their ability to inhibit bovine serum albumin denaturation. Endophytic bacterial strains could produce antioxidants with concentrations ranging from 1.04±0.31 to 358.7±17.9 mg AAE/mL. Endophytic bacterial strains' anti-inflammatory content ranged from 0.40±0.01 to 4.16±0.06 mg DE/mL. The findings of the research indicate that the polyphenol and flavonoid content of endophytic bacterial strains relates to their antioxidant and anti-inflammatory. The polyphenol and flavonoid content of the endophytic bacterial strains ranged from 12.9±0.2 đến 23.8±0.1 mg gallic acid equivalent (GAE)/mL và 13.9±2.8 đến 252.8±2.8 quercetin equivalent (QE)/mL, respectively. Elephantopus mollis endophytic bacterial strains have the capacity to generate secondary metabolites that have anti-inflammatory and antioxidant abilities.

The study aimed to identify endophytic bacterial strains in Anoectochilus setaceus with antioxidant properties in vitro. Antioxidant capacity was evaluated by measuring polyphenols, flavonoids, total antioxidant (TAC) and reducing power (RP). The study found 20 strains of endophytic bacteria isolated from trunks, leaves and roofs of A. setaceus. All isolated endophytic bacteria could generate antioxidants. Three bacterial strains exhibited the highest antioxidant capacity:AS-T4, AS-R2, AS-L3. The AS-T4, AS-R2, and AS-L3 strains showed the highest TPC at 642,5; 731,4; 1400 (mg GAE/mL), respectively. The TFC for three bacteria strains were 118,6; 134,3; 192,1 (mg QE/mL), respectively. The antioxidant values for the TAC method were 846,3; 1402,6; 1195,0 (mg AAE/mL), while RP  yielded 841,5; 872,0; 946,0 (mg AAE/mL), respectively. The results revealed that the AS-T4, AS-R2, and AS-L3 belong to Enterobacter quasiroggenkampii AS-T4, Enterobacter hormaechei AS-R2, and Bacillus velezensis AS-L3, respectively.

Culture of Burkholderia vietnamiensis BV2 bacteria in nitrogen-free liquid Bruk medium, the result shows that liquid biological nitrogen inoculants have been produced from bacterial strains BV2 based on bacteria density of 108 CFU/mL inoculant to Vietnam standard 8741:2014. Biological nitrogen inoculants of BV2 was used on IR50404 rice cultivar grown at the rice field in Winter-Sping 2020 in Binh Minh - Vinh Long. The experiment was designed in a completely randomized block with 3 replications of 10 treatments including 0%N-KCP; 0%N-CP; 100%N-KCP; 100%N-CP; 25%N-KCP; 25%N-CP; 50%N-KCP; 50%N-CP; 75%N-KCP and 75%N-CP. The results from the field experiment showed that treatments 50%N-CP inoculated with biological nitrogen inoculants with reducing nitrogen 50% had yield components such as plant height, number of tillers/m2, number of tillers/plant, filled grain percentage, 1000 grain weight and rice yield 6,73 tons/ha was not different when compared to the complete nitrogen fertilization treatment (100%N-KCP). The BV2 strain provides the equivalent of 50% of the chemical nitrogen needed for rice plants' growth, development and productivity.

This study focuses on the green synthesis method of ZnO microparticles combined with Sonneratia caseolaris L. leaf extract to find new sources of biologically active materials. Wet-lab experiments were conducted to investigate suitable conditions for green synthesis of these microparticles by adding S. aseolaris leaf extract with the support of Design Expert software using response surface methodology (RSM). The results show suitable conditions for green synthesis of ZnO microparticles: extract concentration of 0.1%, reaction temperature of 50°C, and 1-hour reaction time. The product was investigated for its physicochemical characteristics and antioxidant activity, showing that when the leaf extract was added, the activity of the microparticle system was significantly enhanced, and the difference was statistically significant. This result proposed an essential premise for further research investigating the biological activity and application potential of the green synthesis of ZnO microparticles combined with S. aseolaris leaf extract.

The study was conducted to determine the anticancer cell activity of cell-free supernatant and ethyl acetate extract from endophytic bacteria Kosakonia sp. ZO-Rh4 on cervical cancer (HeLa), colorectal cancer (HT29) and liver cancer (HepG2, HUH7) cell lines; the normal kidney cell line Hek 2.9.3 was used as a control. The results showed that the extract from the cell-free supernatant of Kosakonia sp. ZO-Rh4 had a stronger toxicity than the cell-free supernatant by 1,37 to 1,7 times. The sample was more toxic to the colorectal cancer cell line (HT29) with IC50 recorded as 14,86 µg/mL for the extract and 23,55 µg/mL for the  cell-free supernatant. This study's initial resultsopened a new direction for research on natural sources of biologically active compounds from plant endophytic bacteria.

Medication adherence is a key factor in controlling patients' blood pressure. Thus, this research was conducted with two objectives: (1) Identify the ratio of antihypertensive medication adherence in outpatients at the Outpatient Department - Can Tho General Hospital in 2024, (2) Identify factors related to antihypertensive medication adherence in outpatients at the Outpatient Department - Can Tho General Hospital in 2024. A cross-sectional descriptive study was conducted on 324 hypertensive outpatients at the Outpatient Department - Can Tho General Hospital from January 2nd, 2024 to April 29th, 2024. The results demonstrated that the ratio of antihypertensive medication adherence was 74.7%. Multivariate analysis showed that the number of antihypertensive drugs, reducing daily fatty intake, and reducing daily alcohol consumption were related to antihypertensive medication adherence (significance level p

Many Acalypha species have been used in traditional medicine for a wide range of applications. In this study, two plant specimens were collected on the Huong river bank, Hue city and deposited at the Herbarium of Biological Museum, VNU University of Science (HNU) with herbarium codes HNU025526 and HNU025527. Comparison of morphological characters and analysis of the four common molecular markers matK, rbcL, ITS and trnL-trnF shows that these two plant specimens are Acalypha arvensis Poepp. Thus, the Acalypha arvensis Poepp. was recorded for the first time in Vietnam, adding another plant species for the Flora of Vietnam.

The investigation was carried out to isolate endophytic bacteria and evaluate their antioxidative activities in vitro. The antioxidant capacity was determined by total polyphenols, flavonoids, antioxidation capacity, and reducing power. The results revealed that 30 endophytic bacterial strains from the Biophytum sensitivum plant were found, exhibiting antioxidant activity. BS-R1, BS-L1, and BS-S8 have shown the ability to produce the most effective antioxidants and antagonistic efficacy. The BS-R1 and BS-L1 strains belong to the genus Bacillus with a similarity of 99.93%, while the BS-F8 strain has a similarity of 100% with the genus Calidifontibacillus.

The study aims to find the bacteria Hydnophytum formicarum endophytic bacteria that have the ability to produce antioxidants (total flavonoid content (TFC), total antioxidant capacity (TAC), and reducing power (RP)). In addition, promising bacterial strains were identified through observing morphology, and 16s rRNA. Samples of roots, stems and leaves of Hydnophytum formicarum plant in Phu Quoc city, Kien Giang province were used as raw materials to isolate bacteria. The results showed that a total of 25 endophytic bacterial strains isolated from different parts Hydnophytum formicarum had potential antioxidant activity. Among them, three bacterial strains HF-L5, HF-T11 and HF-R6 were selected for identification. The results showed that these bacterial strains belong to the Bacillus genera (strains HF-L5 and HF-T11) and Pantoea (strain HF-R6).

Using natural preservatives for fruit has been a concern for scientists. Therefore, this study aims to synthesize a sol-gel system containing ZnO-gelatin-Elaeocarpus hygrophilus Kurz leaf extract for application in surface coating for preserving tomatoes. The results showed that the appropriate conditions for synthesizing microparticle systems containing ZnO-gelatin-extract for application in mixing to create sol-gel systems with concentrations of 0.5% and 1.0% are: 0.3125 g of zinc acetate, 0.1565 g of gelatin, and 0.1250 g of leaf extract. Combining wet-lab experimental research and predictions based on response surface modeling (RSM) shows that all three factors, Zinc acetate (A), Gelatin (B), and Extract (C), all contribute significantly to improving the effectiveness of forming a sol-gel system containing ZnO-gelatin-extract in preserving tomatoes. This result creates an essential premise for further research to investigate the ability to preserve other fruits based on this potential microparticle system and investigate related biological activities.

The purpose of this study was conducted to isolate and select bacteria with fixing nitrogen and inorganic phosphorus solubilising activity on Luria Bertani (LB) medium containing sodium chloride 4 ‰ from mango cultivated soil samples under salt stress conditions in Can Gio district, Ho Chi Minh city. In this study, 23 salt tolerants were isolated. The fixing nitrogen activities of two strains were much higher than the remaining ones, including X4.1 and X1.1, with variable NH4+ concentrations (3.42 mg/L and 3.29 mg/L, respectively) after six days of culture. The ability of solubilizing phosphate of two strains was higher than the others, including X7.1 and X6.1 (with soluble index (SI) 8.8 and 5.3, respectively) after six days of culture. Two strains of bacteria X4.1 and X8.2 provided the best results for root length and stem height after being added to rice seeds in test tubes for 15 days. Based on the 16S-rRNA gene sequence similarity, two nitrogen-fixing bacterial strains were identified as Pantoea sp. X4.1 and Bacillus subtilis X8.2.

Bacterial wilt caused by Ralstonia solanacearum on chrysanthemum has been taking significant economic losses. Compounds containing copper or antibiotics are not effective in disease prevention and treatment. Besides, phage therapy is a promising direction in controlling diseases caused by bacteria in plants. Under net-house conditions, bacteriophage FBT56 at densities of 106, 107, 108 PFU/mL) were irrigated into chrysanthemum plants' roots to assess the ability to control bacterial wilt disease. The results show that bacteriophage FBT56 treated with the above densities has the ability to reduce the incidence and disease rate. In particular, the treatment with FBT56 at 107 (PFU/mL) and 108 (PFU/mL) had similar effectiveness in reducing disease incidence and severity higher than the treatment with FBT56 at 106 (PFU/mL) after 16 days after inoculation. In field conditions, using the bacteriophage (BT56) to control bacterial wilt on Chrysanthemum sp. should be applied with a density of 107 (PFU/mL).

The objective of the study was to determine the effects of three different carbohydrates: glucose, fructose and sucrose in the cold storage environment on the quality of goat sperm stored in liquid nitrogen. The experiment investigated the effects of 6 types of preservation environments with different carbohydrate concentrations. Semen samples were collected and diluted with medium and stored in liquid nitrogen (-196°C). After 72 hours of storage, the sample was thawed and checked for quality. The results showed that the preservation environment with a glucose concentration of 69 mM has goats’ sperm maintain the optimal quality. Specifically, the total motility rate, progressive motility rate, viability rate, cell membrane integrity rate, antioxidant rate and acrosome integrity rate of sperm are 67%, 49.79%, 73.25%, 52.88%, 28.06% and 97.29%. Research results showed that 69 mM glucose supplemented medium is the optimal choice for cryopreservation of goat sperm.

The research aims to evaluate the quality of sweet fermented glutinous rice collected in Can Tho City through some physicochemical indicators (moisture, Brix degree, ethanol content, total acid content, pH) and microbiological indicators (total yeast and mold count, total aerobic count, total lactic acid bacteria, and quantification of total Coliforms and Escherichia coli). The analysis showed that the sweet fermented glutinous rice moisture content was 30,57-40,48% w/w and ethanol concentration ranged from 8,7-12,7% v/v. The total yeast and mould count was determined from 3,1x106 to 2,0×107 CFU/g. In addition, the study also isolated 5 strains of mold and 15 strains of yeast present in starter and sweet fermented glutinous rice on PD (Potato Dextrose) and YPD (Yeast extract Peptone Dextrose) media. The isolated yeast and mold strains with high activity will be used as the resources for the manufacture of sweet fermented glutinous rice to maintain the traditional craft village and preserve valuable local genetic resources

Oxidative stress damages biological molecules such as proteins, lipids and DNA, and is associated with the development of diseases such as cancer, cardiovascular disease, neurological disorders, diabetes,... Designing new antioxidants that prevent and treat oxidative stress with good bioavailability has attracted special attention for several decades. This study investigated the antioxidant activity of trolox, cysteamine and trolox-cysteamine complex using DFT density functional theory method, combining B3LYP functional, aug-CC-pVTZ basis set to optimize structures and calculate energy values. Besides, solvent effects on antioxidant activity were investigated using the IEF-PCM model. Calculated results showed that all three compounds showed antioxidant activity in water and pentyl ethanoate. Notably, the stable trolox-cysteamine complex with amide derivative structure showed the highest antioxidant capacity in water and pentyl ethanoate media.

The study was conducted to propagate Dendrobium lituiflorum orchids from protocorm like bodies. The results showed that: (i) The number of PLBs could be quickly multiplied on MS medium supplemented with TDZ (0.5-1.5 mg/L) and NAA 0.05 mg/L, with the highest amount of biomass (5.01 - 6.11g/PLBs), compared to the control treatment (2.11 g/PLBs) after 12 weeks of culture. These PLBs could be turned into shoots and used to create in vitro root induction on MS medium supplemented with NAA 1 mg/L, ripen banana at 150 g/L and activated charcoal 3 g/L, showing high rooting efficiency (100% rooting rate, 12.8 roots/plantlet after 6 weeks of cultured). Furthermore, in the acclimatization stage, the substrate of charcoal and sphagnum moss (ratio 1:1) combined with nylon cover indicated a high survival rate (90.2% after 4 weeks of hardening). The orchids grew well and could be transferred into pots for normal farming conditions.

The level of species diversity of the genus Baccaurea often makes it difficult to conserve, preserve food, and apply medicinally. This study aims to characterize the two descriptive markers including leaves, flower and fruit structures from four Burmese grape varieties such as Ha Chau, Xiem, Xanh, and Vang in Phong Dien district based on the plant morphological analysis method. The results revealed that the leaf morphology of the four Burmese grape varieties shared common characteristics of the genus Bacaurea. The area of leaf blades and veins of Ha Chau and Xiem are similar, while this parameter is more significant than that of the other varieties. The color and shape of the fruit of the four Burmese grape varieties are clear. No variation in terms of flower composition and quantity was detected in floral structure, but the number of flowers per inflorescence is variable. Analysis of the anatomical structure also found diversity among Burmese grape varieties. The type of leaf base, single-celled hairy structure under the blade, and petiole illustrated the differences and were used to discriminate the Ha Chau Burmese grape.

Kon Plong is one of the areas with important biodiversity and conservation values in Vietnam. Forest conservation by planting medicinal plants under the forest canopy is considered a suitable direction. The implementation process and selection criteria for medicinal plants that can be planted under the forest canopy have been established. Investigating and cataloguing of medicinal plants in forest habitats have been conducted. The result of the study showed that 170 species of plants with medicinal potential under the forest canopy have been recorded. By assessing levels of diversity such as shapes of stem and uses, seven species including Anoectochilus setaceus, Dianella ensifolia, Gynura sp., Codonopsis javanica, Gynostemma pentaphyllum, Litsea cubeba and Ampelopsis cantoniensis have been selected as potential groups of plants. The anatomical structure and some chemical compounds were also investigated to supplement the database for these species.

The study was aimed to compare the yield, the content of total polyphenol (TPC), flavonoids (TFC) and antioxidant activity of extracts from three green orange cultivars (cv. Sanh, Xoan and Mat) and Navel cultivar by soaking and Soxhlet method. The antioxidant activity of the extract was determined by DPPH, ABTS, FRAP and RP assays. The results showed that the yield of extracts by Soxhlet method was higher than that of the soaking method in four orange cultivars. The extract from Sanh cultivar by Soxhlet method was the highest yield (15.1%) followed by the extract from Sanh cultivar (11.1%). However, TPC and TFC of the extracts by Soxhlet method were lower than soaking method, ranging from 25.8 – 46.7 mg GAE/g and 16.5 – 30.5 mg QE/g, respectively. The extracts by soaking method had higher antioxidant activity than Soxhlet method. The extract from Xoan cultivar by soaking and Soxhlet method had the highest TPC and TFC content but the extract using the soaking method had the highest antioxidant activity. In summary, Soxhlet method had a higher yield but lower antioxidant activity than soaking method.

The research was conducted to isolate, and select bacteria from sheep rumen which were capable of producing and purifying phytase including methods of protein precipitation by ammonium sulfate salt 80% and ion exchange chromatography on DEAE-cellulose gel. The molecular weight of the protein was assessed by SDS-PAGE electrophoresis. Among 16 isolates of bacteria from sheep rumen which were capable for degrading phytate, the strain C8 was determined to create the highest protein and phosphate content of 0.320 mg/mL, 11.76 mg/mL, respectively. The nucleotide sequence of 16S rDNA region between the bacterial strain C8 isolated from the sheep rumen and others on the NCBI genbank were compared. The results showed that the C8 bacterial strain was similar 93.16% with the Bacillus rugosus strain SPB7. Phytase fraction F1 was obtained with recovery efficiency of 13.2%, purity 3.04 times, total activity of 8,733 U, specific activity of 280 U/mg protein and molecular weight 34.9 kDa.