Nguyễn Văn Ngọc

ORCID: 0000-0002-1518-9470
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Research Areas
  • Plant and Fungal Species Descriptions
  • Plant Diversity and Evolution
  • Plant and animal studies
  • Research studies in Vietnam
  • Natural product bioactivities and synthesis
  • Essential Oils and Antimicrobial Activity
  • Phytochemistry and Biological Activities
  • Wood and Agarwood Research
  • Traditional and Medicinal Uses of Annonaceae
  • Genomics and Phylogenetic Studies
  • Magnolia and Illicium research
  • Plant-derived Lignans Synthesis and Bioactivity
  • Plant Pathogens and Fungal Diseases
  • Identification and Quantification in Food
  • Species Distribution and Climate Change
  • Marine and Coastal Ecosystems
  • Natural Compound Pharmacology Studies
  • Biological Activity of Diterpenoids and Biflavonoids
  • Ethnobotanical and Medicinal Plants Studies
  • Advanced Database Systems and Queries
  • Phytochemistry and Bioactive Compounds
  • Grey System Theory Applications
  • Agricultural Systems and Practices
  • Microgrid Control and Optimization
  • Vietnamese History and Culture Studies

Dalat University
2016-2025

National Economics University
2024

Moscow Power Engineering Institute
2022

Moscow Aviation Institute
2022

Moscow Institute of Physics and Technology
2022

Vietnam Maritime University
2018-2021

Vietnam Academy of Science and Technology
2020

Hanoi University of Science and Technology
2020

Kyushu University
2016-2018

Magnolia braianensis (Gagnep.) Figlar is an endemic species native to Vietnam. To date, its essential oil's chemical composition and biological activity have not been studied. This study aimed investigate the activities of leaf oil from M. braianensis. The was analyzed using GC/MS, while antimicrobial evaluated through a microdilution broth assay. Additionally, ABTS+ DPPH scavenging assays were conducted assess antioxidant potential. results show that twenty-four compounds identified in oil,...

10.1002/cbdv.202403166 article EN Chemistry & Biodiversity 2025-02-11

The taxonomy of Quercus langbianensis and its relatives in Vietnam Cambodia have been revised based on evidence obtained from field observations, morphological comparison herbarium specimens molecular analyses using both classic next generation DNA markers. Based Bayesian inference rbcL, matK ITS regions Neighbour-joining tree genome-wide sequences amplified with multiplexed inter-simple sequence repeat (ISSR) primers (MIG-seq), the authors recognised ten species complex Cambodia, three...

10.3897/phytokeys.95.21126 article EN cc-by PhytoKeys 2018-02-07

Identifying and protecting refugia is a priority for conservation management under projected anthropogenic climate change. We have two main objectives: the first to explore spatial (East Asia) temporal (Last Glacial Maximum year 2070) distribution patterns of dominant Castanopsis species evergreen broad-leaved forests, also relation with their niche breadths; second identify long-term stable preserving these provide framework strategies. find that there an extraordinary richness 32 species,...

10.1016/j.biocon.2022.109663 article EN cc-by-nc-nd Biological Conservation 2022-08-08

A new species, Quercus xuanlienensis Binh, Ngoc & Bon, is described from Xuan Lien Nature Reserve, Vietnam. The species morphologically similar to Q. edithiae Skan, in having 8-11 pairs of secondary veins, bowl-shaped cupules and ellipsoid cylindrical-ellipsoid basally convex nuts. It differs serrulate leaf margins only at apical 1/5-1/7, almost entire bracts on cupule much longer also fleuryi Hickel A. Camus leaves glabrous both surfaces with an apically margin but shorter petioles,...

10.3897/phytokeys.92.21831 article EN cc-by PhytoKeys 2018-01-09

Natural history collections and tropical tree diversity are both treasure troves of biological evolutionary information, but their accessibility for scientific study is impeded by a number properties. DNA in historical specimens generally highly fragmented, complicating the recovery high-grade genetic material. Furthermore, our understanding hyperdiverse, wide-spread assemblages obstructed extensive species ranges, fragmented knowledge phenology, widespread lack species-level diagnostic...

10.1371/journal.pone.0232936 article EN cc-by PLoS ONE 2020-05-22

Quercus is the largest genus of family Fagaceae in world and second-largest Vietnam, with approximately 50 species. However, phylogeny study Vietnam has yet to be thoroughly explored. In this study, we utilize genome-wide single-nucleotide polymorphisms (SNPs) data obtained through Multiplexed Inter Simple Sequence Repeat Genotyping by sequencing (MIG-seq) explore phylogenetic relationships among species Vietnam. The results reveal that all belong subgenus Cerris analysis strongly supports...

10.15625/2615-9023/19721 article EN ACADEMIA JOURNAL OF BIOLOGY 2024-03-29

A new species, Popowia bachmaensis Ngoc, Tagane & Yahara, sp. nov. is described from Bach Ma National Park in Thua Thien Hue Province, Central Vietnam. This species morphologically similar to pisocarpa (Blume) Endl. ex Walp., but can be readily distinguished it by its lower stems, smaller leaves, shorter flowering pedicels, carpels, longer sepals and inner petals. detailed description, comprising illustrations, supplemented with DNA barcodes of the two regions rbcL matK, are provided.

10.3897/phytokeys.65.8792 article EN cc-by PhytoKeys 2016-07-12

Macrosolen bidoupensis Tagane & V.S.Dang, sp. nov. (Loranthaceae) is newly described from Bidoup Nui Ba National Park in Lam Dong Province, southern Vietnam. The new species characterized by small broadly elliptic to circular leaves, sessile short petioles, slightly cordate rounded leaf bases, 4-5 pairs of lateral veins and a basally green corolla tube. An illustration, summary DNA barcoding the plastid genes rbcL matK, key Vietnam are provided.

10.3897/phytokeys.80.13338 article EN cc-by PhytoKeys 2017-06-05

Three new species, Lithocarpusbidoupensis Ngoc & Tagane, L.congtroiensis Yahara, and L.hongiaoensis Binh are described from Bidoup-Nui Ba National Park, Central Highland of Vietnam. Morphological analyses Maximum likelihood tree based on genome-wide SNPs support the distinction those species previously known taxa in region. The three considered to be endemic Park preliminary conservation status for each is evaluated as Critically Endangered.

10.3897/phytokeys.186.69878 article EN cc-by PhytoKeys 2021-12-06

Lithocarpus dahuoaiensis Ngoc & L. V. Dung, a new species from the Central highland of Vietnam, is described and illustrated. The morphologically similar to macphailii (M. R. Hend.) Barnett or encleisocarpus (Korth.) A. Camus in having completely entire leaf margin, solitary cupule, long stalks fruits, deeply cup-shaped turbinate cupules, with number horizontal filiform lines. differs its nut enclosure ca. 1/2 – 2/3 nut, adaxially glabrous blades, secondary veins 11–12 pairs faintly very...

10.3897/phytokeys.69.9821 article EN cc-by PhytoKeys 2016-08-18

A new species, Quercus trungkhanhensis Binh & Ngoc (Fagaceae), from Cao Vit Gibbon Conservation Area, northeastern Vietnam is described. It morphologically similar to Q. engleriana Seemen and ma

10.18942/apg.201713 article EN Acta Phytotaxonomica et Geobotanica 2018-01-01

Lasianthus giganteus Naiki (Rubiaceae), first found in Cambodia, was recently discovered central Vietnam and southern Thailand. We describe the floral morphology of this species for time.

10.18942/apg.201614 article EN Acta Phytotaxonomica et Geobotanica 2017-01-01

A new species, Callicarpa bachmaensis Soejima & Tagane, sp. nov., is described and illustrated from Bach Ma National Park in Thua Thien Hue Province, Central Vietnam. This species has a characteristic liana habit, white corolla, narrowly elliptic to lanceolate, entire, occasionally subequal leaves, by which it clearly distinguished the other previously known of this genus.

10.3897/phytokeys.62.7974 article EN cc-by PhytoKeys 2016-03-25

Homalium glandulosum Tagane & V. H. Nguyen, from Vu Quang National Park in northern Vietnam, is newly described. This species characterized by distinct glands, often stalked, at the base of lamina and along margin stipules bracteoles. Illustrations, DNA barcodes two regions rbcL matK, a key to Vietnam are also provided.

10.3897/phytokeys.58.6816 article EN cc-by PhytoKeys 2016-01-12

Lithocarpus vuquangensis Ngoc & Hung is described from Vu Quang National Park, North Central Vietnam. The morphological comparison and phylogenetic analysis based on rbcL, matK ITS provided evidence that the new species was not assignable to any of previously known taxa in Vietnam its surrounding countries. description, photographs, preliminary conservation status DNA barcode sequences are also for species.

10.3897/phytokeys.95.21832 article EN cc-by PhytoKeys 2018-01-30

A new species of Quercus (Fagaceae), Q. ngochoaensis, from Ba Vi National Park, Ha Noi, northern Vietnam is described and illustrated. This morphologically similar to glauca in having glabrous twigs, cuneate leaf base, two or three fruits per infructescence, almost entire margin lamellate rings on cupule except the lowest rings, slightly convex scar at base a nut. However, it differs smaller leaves, cup-shaped enclosing 1/2–2/3 nut, 7–8 cupule, subglobose In addition description, DNA...

10.11646/phytotaxa.516.3.7 article EN Phytotaxa 2021-08-26

A new species, Garcinia hopii H.Toyama & V.S.Dang is described from Bidoup Nui Ba National Park, southern Vietnam. This species similar to hendersoniana Whitmore but differs that in having larger leaves, clustered pistillate flowers, a greater number of sterile anthers and stigma young fruits. description, preliminary conservation assessment, illustration, photographs DNA barcodes the are provided, as well an updated key sect. Hebradendron Indochina.

10.3897/phytokeys.77.11575 article EN cc-by PhytoKeys 2017-02-28

Abstract An analysis was conducted on the essential oil extracted from leaves of Magnolia bidoupensis utilizing GC‐MS, revealing thirty‐three constituents that account for 98.9 % oil. The main components included pogostol (22.4 %), δ ‐selinene (16.2 and α ‐amorphene (14.7 %). Bioassays were then performed to evaluate oil's biological activity. exhibited antimicrobial activity against all tested microorganisms (six bacterial strains one fungal strain) using minimum inhibitory concentration...

10.1002/cbdv.202402472 article EN Chemistry & Biodiversity 2024-10-23

Loài chàm muồng (Indigofera cassioides Rottl. ex Bl.) và bụi suffruticosa Mill.) là hai loài thực vật cho bột phân bố nhiều ở khu vực Lâm Đồng. Trong đó, mang màu có nguồn gốc tự nhiên đã được con người sử dụng từ rất lâu đời để làm chất nhuộm thuốc điều trị một số bệnh v.v… Tuy nhiên, chưa nghiên cứu nào hiện đánh giá hiệu suất tách chiết hàm lượng indigotin (indigotin tạo nên xanh chàm) này trên thế giới. Nghiên nhằm trong mẫu tươi của Indigofera Bột thu bằng cách phương pháp ngâm. Hàm...

10.34238/tnu-jst.9547 article VI TNU Journal of Science and Technology 2024-06-11

Nghiên cứu được thực hiện với mục đích đánh giá hiệu quả tách chiết cao từ lá loài Blumea densiflora var. hookeri phân bố ở Lâm Đồng bằng dung môi ethanol, đồng thời khảo sát thành phần hoá học và hoạt tính kháng oxy của ethanol thu này. Kết nghiên cho thấy suất phương pháp soxhlet B. là 9,62%. Thành có trong định theo Nguyễn Văn Đàn Viết Tựu (1985) kết hợp Kim Phi Phụng (2007) 7 nhóm chất gồm alkaloid, terpenoid-steroid, flavonoid, glycoside, glycoside tim, tannin courmarin. Hàm lượng...

10.34238/tnu-jst.10522 article VI TNU Journal of Science and Technology 2024-09-27

Quercus L. là chi lớn nhất trong họ dẻ với hơn 500 loài phân bố rộng khắp Châu Âu, Bắc Mỹ, Địa Trung Hải, các khu rừng rụng lá ôn đới ở Đông Á và nhiệt trên núi Nam Á. Nghiên cứu này nhằm khảo sát thành phần hóa học đánh giá hàm lượng polyphenolic tổng số dịch chiết metanol từ của ba henferiana, bidoupensis lanata. Sử dụng phương pháp định tính hoá polyphenol đã xác được cả 3 đều có hợp chất anthraglycoside, đường khử, flavonoid, sesquiterpene lactone tannin. Hàm phenol Q. bidoupensis,...

10.34238/tnu-jst.9361 article VI TNU Journal of Science and Technology 2024-03-11

Thu hải đường langbiang (B. langbiangensis) thuộc chi Begonia, họ Begoniaceae, có nguồn gốc từ núi Langbiang tỉnh Lâm Đồng. Cho đến nay, chưa nhiều nghiên cứu về loài này, đặc biệt là các thành phần hóa học và hoạt tính sinh của nó. Nghiên này được thực hiện nhằm đánh giá sơ bộ kháng khuẩn dịch chiết thu lá, thân rễ langbiang. Dung môi ethanol dùng để tách hợp chất thân, chiết. Các sử dụng cho vật khuẩn. phương pháp định trong theo Harborne. Kết quả thấy sự diện alkaloid, coumarin, steroid,...

10.34238/tnu-jst.9268 article VI TNU Journal of Science and Technology 2024-05-08

Mục tiêu: Xác đinh một số yếu tố liên quan động kinh kháng thuốc ở trẻ em.
 Đối tượng và phương pháp: Nghiên cứu mô tả cắt ngang trên 100 em mắc gồm 46 nữ (46%) 54 nam (54%), được chia thành 2 nhóm: nhóm (n = 50) đáp ứng 50). Tiêu chuẩn chẩn đoán theo Hiệp hội chống thế giới (ILAE 2010).
 Kết quả: Động có tiền căn trạng thái chiếm 30%, co giật sơ sinh 22%, do sốt 44% chậm phát triển tâm thần vận 92%. Tuổi khởi trung bình là 17,3 ± 13 tháng, tần suất cơn trong 1 ngày 12 8. toàn thể...

10.52163/yhc.v65i1.885 article VI Tạp chí Y học Cộng đồng 2024-01-18

Mục tiêu của nghiên cứu là xác định thực trạng viêm nhiễm đường sinh dục dưới và mô tả một số yếu tố liên quan đến ở phụ nữ có chồng trong độ tuổi từ 18 - 49 tại tỉnh Quảng Bình. Nghiên cắt ngang được tiến hành trên 800 Bình tháng 01 3 năm 2021. Kết quả cho thấy tỷ lệ chiếm 60,1% không mối giữa với các đặc điểm nhân khẩu như nhóm tuổi, nghề nghiệp, trình học vấn cũng tình nạo phá thai. khám sàng lọc chúng tôi mức cao đáng phải lo ngại. Chính vì vậy, đề y tế công cộng tâm can thiệp kịp thời...

10.51403/0868-2836/2023/1445 article VI Deleted Journal 2024-01-26
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