Hue University Journal of Science: Natural Science
2615-9678
Cơ quản chủ quản: N/A
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Các bài báo tiêu biểu
In vitro antioxidant activity and Content of compounds from Curculigo orchioides rhizome
- 2020
Curculigo orchioides Gaertn. is used in traditional medicine in Vietnam. Its antioxidant potential was evaluated through DPPH radical scavenging and the total antioxidant capacity method. The data resulted from DPPH radical scavenging activity indicate that Curculigo orchioides display high activity with a low IC50 value (22.78μg/mL), approximately 1.5 times less than that of curcumin (34.34 μg/mL......
#Curculigo orchioides #antioxidant activity #polysaccharide #saponin – triterpenoids #total phenolic content #total flavonoid content.
Chemical composition and acetylcholinesterase inhibitory activity of essential oil from rhizomes of Distichochlamys benenica
- 2020
Twenty-seven constituents were identified by using GC/MS, representing 99.57% of the rhizome oil of Distichochlamys benenica. The major constituents of the essential oil are 1,8-cineole (54.39%), β-pinene (7.50%), (E)-citral (7.26%), and (Z)-citral (6.79%). The rhizome essential oil has anti-acetylcholinesterase activity with an IC50 value of 136.63 ± 2.70 mg/mL.
#Zingiberaceae #Distichochlamys benenica #essential oil #acetylcholinesterase #1 #8-cineole
NEW RECORDS AND AN UPDATED CHECKLIST OF AMPHIBIANS (AMPHIBIA) FROM PHU YEN PROVINCE, VIETNAM
Tập 126 Số 1B - Trang 81-94 - 2017
Abstract. We herein provide an updated checklist of 33 amphibian species from Phu Yen Province, Vietnam. Eight of them are reported for the first time from this province, namely Ophryophryne gerti, O. hansi, Xenophrys major, Glyphoglossus molossus, Kaloula indochinensis, Microhyla berdmorei, M. nanapollexa, and Amolops spinapectoralis. Additional data of morphological characters of afore mentioned......
SYNTHESIS OF METAL-ORGANIC FRAMEWORK-199: COMPARISON OF MICROWAVE PROCESS AND SOLVOTHERMAL PROCESS
Tập 126 Số 1C - Trang 107-116 - 2017
In the present paper, a comparative study on the synthesis of the metal-organic framework–199 (MOF–199) using the microwave and solvothermal method was demonstrated. The obtained materials were characterized using X-ray diffraction, scanning electron microscope, nitrogen adsorption/desorption iso-therms and thermal gravity. The microwave synthesis of MOF–199 was compared with the conventional hydr......
#MOF-199 #comparative #microwave #solvolthermal
Effect of Dzyaloshinskii–Moriya interaction on Heisenberg antiferromagnetic spin chain in a longitudinal magnetic field
Tập 130 Số 1D - Trang 31-38 - 2021
Using functional integral method for the Heisenberg antiferromagnetic spin chain with the added Dzyaloshinskii-Moriya Interaction in the presence of the longitudinal magnetic field, we find out expression for free energy of the spin chain via spin fluctuations, from which quantities characterize the antiferromagnetic order and phase transition such as staggered and total magnetizations derived. Fr......
#antiferromagnetic spin chain #Dzyaloshinskii–Moriya interaction #transverse spin fluctuations #functional integral method
English
Tập 132 Số 1B - Trang 49-58 - 2023
Xuan Thuy National Park in the Red River Delta Biosphere Reserve is a biodiverse area that supports a variety of flora, fauna, and fishery resources. This study aims to provide new data on goby fish in this area by conducting monthly collections from 2018 to 2019. Based on morphological analysis, we identified 43 species of gobies, 27 of which were tropical fish. We added three new goby records to......
#goby fish #Xuan Thuy National Park #sustainable exploitation #mangrove forest #species diversity
Effect of extraction temperatures on in vitro antioxidant activities of polysaccharides from Ophiocordyceps sobolifera
- 2019
The objective of this paper is to evaluate the effects of extraction temperatures on in vitro antioxidant potential of polysaccharides from the Ophiocordyceps sobolifera. The antioxidant capacity of Ophiocordyceps sobolifera polysaccharides was evaluated using 2,2‐diphenyl‐1‐picrylhydrazyl (DPPH) as a radical scavenger and the total antioxidant capacity methods. The results show that the highest a......
#Ophiocordyceps sobolifera #polysaccharides #extraction temperature #antioxidant activity
Preparation of cuprous‐oxide nanoparticles using ascorbic acid as reducing agent and its photocatalytic activity
Tập 128 Số 1D - Trang 31-37 - 2019
In this present paper, cuprous‐oxide (Cu2O) nanoparticles were successfully fabricated using ascorbic acid as a reducing agent. The purity and characteristics of Cu2O nanoparticles were determined with XRD and FT‐IR techniques. The orphology and particle size of the material were characterized using SEM and TEM, respectively. The results show that the concentration of sodium hydroxide affects the ......
#cuprous-oxide nanoparticles #ascorbic acid #photocatalytic degradation #photocatalytic activity #Rhodamine B
ẢNH HƯỞNG CỦA NANO BẠC LÊN KHẢ NĂNG CẢM ỨNG MÔ SẸO VÀ TÁI SINH CHỒI TỪ MẪU LÁ CÂY DÂU TÂY (FRAGARIA X ANANASSA) NUÔI CẤY IN VITRO
Tập 127 Số 1C - Trang 61-70 - 2018
Trong nghiên cứu này, ảnh hưởng của nano bạc lên khả năng cảm ứng hình thành mô sẹo và tái sinh chồi từ mẫu lá ex vitro thông qua khử trùng cũng như sinh trưởng, phát triển của chồi dâu tây khi bổ sung trực tiếp vào môi trường nuôi cấy được khảo sát. Các mẫu lá khử trùng trong nano bạc ở nồng độ, thời gian khác nhau được so sánh với mẫu đối chứng khử trùng trong HgCl2, Ca(ClO2). Tất cả các mẫu lá ......
ULTRASOUND-ASSISTED SYNTHESIS OF MAGNETITE NANOPARTICLESBY CO-PRECIPITATION METHOD
Tập 126 Số 1C - Trang 29-36 - 2017
In the present paper, the traditional co-precipitation method in synthesis of magnetite (Fe3O4) nanoparticles have been procedurally and ultrasonically altered. The effects of NH3 solution adding paths to precursor solution, and ultrasonic assistance were indicated and demonstrated through specific experiments, and suggested explanations for observed phenomena. Characteristic information has prove......