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Natural Sciences and Technology : [1149]

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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 1149
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  • Journal Article

  • Metal Complexes of π-expanded Ligand (5): Synthesis, Structural, and Photophysical Characterizations of Green-Red Luminescent Pyrene-based Salicylaldiminato-type Zinc Complexes

    • Authors: Luong, Xuan Dien; Nguyen, Thi Thuy Nga (2021)

  • A series of pyrene-based salicylaldimine-type ligands containing n-octyl or cyclohexyl or phenyl groups at imine nitrogen group, 1-hydroxy-2-[(N-substituted-imino)methyl]-pyrenes (octyl 1, cyclohexyl 1b and phenyl 1c), were synthesized and characterized. The ligands reacting with zinc acetate in the presence of sodium acetate gave the bis(salicylaldiminato)-type Zn(II) complexes, [bis[2-[(N-substituted-imino)methyl]-1-pyrenolato-N,O] zinc(II)] (octyl 1(Zn), cyclohexyl 1b(Zn), phenyl 1c(Zn)). The new ligands and complexes were characterized by 1H NMR, IR spectroscopy, mass spectroscopy, elemental analysis, UV-vis spectroscopy, fluorescence spectroscopy, and X-ray diffraction. The influ...
  • item.jpg
  • Journal Article

  • Taxillus Thibetensis (Lecomte) Danser (Loranthaceae) a New Record Species For Flora of Vietnam

    • Authors: Le, Chi Toan; Nguyen, Van Du; Pham, Thu Lan; Le, Thi Ngat; Liu, Bing (2021)

  • Taxillus thibetensis (Lecomte) Danser(Loranthaceae), a species previously known only from China, is newly recorded from Vietnam. A specimen discovered in the rainforest of Lao Cai province, Northern Vietnam was identified as Taxillus thibetensis based on both morphological and molecular data. The Vietnamese individuals of Taxillus thibetensis are closely related to T. thibetensis in China. A detailed description, illustration and data on distribution, ecology, phenology of Vietnamese Taxillus thibetensis are provided.
  • item.jpg
  • Journal Article

  • Conamomum Pierreanum (Gagnep.) Skornick. & A. D. Poulsen (Zingiberaceae), a New Record for the Flora of Vietnam

    • Authors: Luu, Dam Ngoc Anh; Bui, Van Huong; Do, Van Truong; Luu, Dam Cu; Do, Van Hai; Nguyen, Quang Hung; Trinh, Xuan Thanh; Nguyen, Thanh Trung (2021)

  • Conamomum pierreanum (Gagnep.) Skornick. & A. D. Poulsen, (Zingiberaceae), a previously known species from Thailand and Cambodia, is here reported, as a new record for Vietnam. It is similar to C. rubidum and C. odorum but differs in having a present stilt root; a shorter petiole, 2-3 cm; a larger leaf blade, oblong, 30-50 × 5-8 cm, glabrous; a globose to ovoid inflorescence, arising near the base of rhizome; tomentose outer surface of bract; a 3-toothed bracteole, outer surface hairy; and a smaller filament, yellowish and glabrous. The detailed morphological description, distribution and ecology information, conservation status and a colour plate of...
  • item.jpg
  • Journal Article

  • Synthesis and Spectroscopic Characterizations of Ni(II) Thiosemicarbazone Bearing Anthracene

    • Authors: Dinh, Thi Hien; Khuat, Thi Thuy Ha; Nguyen, Tien Dat; Dinh, Thi Thao; Nguyen, Minh Hai (2021)

  • The X-ray structure of 9-anthraldehyde-4-methyl-3-thiosemicarbazone was firstly determined. The Ni(II) complex with this ligand was prepared upon reaction with chloride salt. Mass spectrometry result confirms correct formulation of the complex. Unusual 1H NMR signal pattern of anthracene moiety reveal cis arrangement cemented by intramolecular – stackings between aromatic rings. As a result of this interaction, the electronic structure of anthracene ring is perturbed and gives rise to structureless and broad absorption and emission bands
  • item.jpg
  • Journal Article

  • Isolation and Selection of Purple Non-Sulfur Bacteria for Nutrient Rich Biomass Production from Wastes

    • Authors: Do, Binh Minh; Pham, The Hai (2021)

  • Purple nonsulfur bacteria (PNSB) are anoxygenic photosynthetic bacteria, which are able to photoheterotrophically grow in the presence of excessive nutrients. Hence, PNSB can convert organic components, in waste waters into nutrient rich biomass. This suggests the feasibility of converting wastes into valuable products. In this research, method for isolation of PNSB was optimized, and subsequently used for the isolation of PNSB from domestic waste and pond water samples taken in Hanoi. In addition, the effects of carbon and nitrogen sources and types of waste on biomass and nutrients (protein and carotenes) were also investigated. Four PNSB strains were isolated and based on comparat...
  • item.jpg
  • Journal Article

  • Piper Ribesioides Wall., a Newly Recorded Species for the Flora of Vietnam

    • Authors: Luu, Dam Ngoc Anh; Nguyen, Quang Hung; Nguyen, Trung Thanh; Do, Van Truong (2021)

  • We here reported a newly recorded Piper species for the flora of Vietnam, namely Piper ribesioides Wall. (Piperaceae). This species is most morphologically similar to P. politifolium C.DC. by sharing glabrous plants and fruits with a stipe, but it differs from the latter having a monoecious habit (vs. dioecious), stamens 4 (vs. 2), and a cordate leaf base with equal or subequal lobes (vs. oblique with unequal lobes). Descriptions, illustrations, information on ecology, and taxonomic notes of the species is provided.
  • item.jpg
  • Journal Article

  • Application of Next Generation Sequencing Genetic Studies of Urea Cycle Disorders

    • Authors: Nguyen, Thi Thu Huong; Nguyen, Thi Kim Lien; Nguyen, Huy Hoang (2021)

  • Rối loạn chu trình chuyển hóa urê (UCD) là rối loạn chuyển hóa bẩm sinh, hiếm gặp, gây ra do đột biến trên các gen mã hóa cho 6 enzyme: carbamoyl phosphate synthase I (CPSI), ornithine transcarbamylase (OTC), argininosuccinate synthase (ASS1), argininosuccinate lyase (ASL), arginase (ARG1), N-acetyl glutamate synthase (NAGS) và 2 hệ thống vận chuyển, ornithine translocase (ONT1), citrin, của chu trình chuyển hóa urê. Sự ứ đọng amoniac là nguyên nhân dẫn đến các triệu chứng thần kinh nghiêm trọng, thậm chí tử vong. Các thăm khám lâm sàng, xét nghiệm hóa sinh là cần thiết, nhưng chưa đủ thông tin để đưa ra chẩn đoán chính xác. Phân tích đột biến là phương pháp hữu hiệ...
  • item.jpg
  • Journal Article

  • Platinum(II) Complex of Benzimidazole-Derived N-Heterocyclic Carbene: Synthesis, Characterization, and Photophysical Properties

    • Authors: Nguyen, Van Ha; Trieu, Thi Nguyet; Doan, Thanh Dat (2021)

  • Platinum(II) complex of benzimidazole-derived N-heterocyclic carbene with formula [PtCl2(DMSO)(bimy)] was successfully synthesized via one pot reaction between 1,3-diisopropyl benzimidazolium (bimy×HBr), Ag2O and [PtCl2(DMSO)] (DMSO = dimethyl sulfoxide). The complex was characterized by means of multinuclear (1H and 13C{1H}) magnetic resonance and single crystal X-ray diffraction (XRD). The UV-Vis absorption spectra of the compound show an absorption shoulder above 300 nm. Under excitation by 285 nm UV lamp, solution of the compound in DCM is highly emissive showing emission maxima at around 410 nm. DFT calculations were also carried out for the complex to gain insight on its electro...
  • item.jpg
  • Journal Article

  • The Diversity of Famlily Lauraceae Juss. in Pu Mat National Park, Nghe An Province = Đa dạng họ Long não (Lauraceae Juss.) ở Vườn Quốc gia Pù Mát, Nghệ An

    • Authors: Do, Ngoc Dai; Le, Thi Huong; Dao, Thi Minh Chau; Nguyen, Tien Cuong; Nguyen, Cong Truong; Le, Thi Hong (2021)

  • Kết quả nghiên cứu họ Long não (Lauraceae) ở Vườn Quốc gia (VQG) Pù Mát, tỉnh Nghệ An, đã xác định được 90 loài, 13 chi, trong đó 1 chi và 22 loài bổ sung cho danh lục Pù Mát (2017). Các chi đa dạng nhất tại khu vực nghiên cứu là Cinnamomum-26 loài, Litsea - 24 loài, Lindera-8 loài. Có 4 loài được ghi trong Sách Đỏ Việt Nam (2007): Bộp quả bầu dục (Actinodaphne elliptibacca Kosterm.), Vù Hương (Cinnamomum balansa Lecomte), Re cam bốt (Cinnamomum cambodianum Lecomte) và Re hương (Cinnamomum parthenoxylon (Jack.) Meisn.). Các loài cây họ Long não ở khu vực nghiên cứu có các giá trị sử dụng khác nhau như cho gỗ với 60 loài, cho cho tinh dầu với 50 loài, làm thuốc ...
  • item.jpg
  • Journal Article

  • Electronic Structures of Homodinuclear Platinum(II), Palladium(II) and Gold(I) Complexes Featuring Janus-type Benzoxazolin-2-ylidene Linkers

    • Authors: Nguyen, Van Ha; Nguyen, Thi Thu Hang (2021)

  • Electronic structures of a series of three homodinuclear platinum(II), palladium(II) and gold(I) complexes featuring Janus-type benzoxazolin-2-ylidene bridges and N,N-diisopropyl benzimidazolin-2-ylidene auxiliary ligands have been investigated. The gas-phase molecular structures of all compounds were first optimized using B3PW91 functional and SDD/6-31G(d) combination of basis sets. The nature of their frontier orbitals were then examined. The higher energy occupied molecular orbitals are predominantly d orbital of the metal in combination with orbital of N,N-diisopropyl benzimidazolin-2-ylidene. On the other hand, the lower energy unoccupied molecula...
  • item.jpg
  • Journal Article

  • Sequencing Coding Region and in Silico Structural Analysis of Protein Hexon of HAdV-3 Causing Conjunctivitis in Vietnam

    • Authors: Nguyen, Van Sang; Nguyen, Thi Thu Huyen; Le, Tuan Anh (2021)

  • Human adenovirus (HAdVs) are responsible for about 65-90% of viral conjunctivitis. Understandings of HAdVs bring promises in prevention, treatments, and biological preparations. However, thorough researches on structural proteins of HAdVs are still limited in Vietnam. In this study, we have sequenced the entire coding gene of protein hexon from HAdV-3 causing conjunctivitis in Vietnam and compared with the reference sequence in NCBI database. We detected 42 DNA variants, of which, 11 resulted in amino acid substitutions. Simulation of HAdV-3 hexon structure showed that all 11 substitutions located in crucial positions. This result revealed high risks from hexon gene variants of HAdV-3...
Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 1149

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Natural Sciences and Technology : [1149]

Follow this collection to receive daily e-mail notification of new additions
Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 1149
  • item.jpg
  • Journal Article

  • Metal Complexes of π-expanded Ligand (5): Synthesis, Structural, and Photophysical Characterizations of Green-Red Luminescent Pyrene-based Salicylaldiminato-type Zinc Complexes

    • Authors: Luong, Xuan Dien; Nguyen, Thi Thuy Nga (2021)

  • A series of pyrene-based salicylaldimine-type ligands containing n-octyl or cyclohexyl or phenyl groups at imine nitrogen group, 1-hydroxy-2-[(N-substituted-imino)methyl]-pyrenes (octyl 1, cyclohexyl 1b and phenyl 1c), were synthesized and characterized. The ligands reacting with zinc acetate in the presence of sodium acetate gave the bis(salicylaldiminato)-type Zn(II) complexes, [bis[2-[(N-substituted-imino)methyl]-1-pyrenolato-N,O] zinc(II)] (octyl 1(Zn), cyclohexyl 1b(Zn), phenyl 1c(Zn)). The new ligands and complexes were characterized by 1H NMR, IR spectroscopy, mass spectroscopy, elemental analysis, UV-vis spectroscopy, fluorescence spectroscopy, and X-ray diffraction. The influ...
  • item.jpg
  • Journal Article

  • Taxillus Thibetensis (Lecomte) Danser (Loranthaceae) a New Record Species For Flora of Vietnam

    • Authors: Le, Chi Toan; Nguyen, Van Du; Pham, Thu Lan; Le, Thi Ngat; Liu, Bing (2021)

  • Taxillus thibetensis (Lecomte) Danser(Loranthaceae), a species previously known only from China, is newly recorded from Vietnam. A specimen discovered in the rainforest of Lao Cai province, Northern Vietnam was identified as Taxillus thibetensis based on both morphological and molecular data. The Vietnamese individuals of Taxillus thibetensis are closely related to T. thibetensis in China. A detailed description, illustration and data on distribution, ecology, phenology of Vietnamese Taxillus thibetensis are provided.
  • item.jpg
  • Journal Article

  • Conamomum Pierreanum (Gagnep.) Skornick. & A. D. Poulsen (Zingiberaceae), a New Record for the Flora of Vietnam

    • Authors: Luu, Dam Ngoc Anh; Bui, Van Huong; Do, Van Truong; Luu, Dam Cu; Do, Van Hai; Nguyen, Quang Hung; Trinh, Xuan Thanh; Nguyen, Thanh Trung (2021)

  • Conamomum pierreanum (Gagnep.) Skornick. & A. D. Poulsen, (Zingiberaceae), a previously known species from Thailand and Cambodia, is here reported, as a new record for Vietnam. It is similar to C. rubidum and C. odorum but differs in having a present stilt root; a shorter petiole, 2-3 cm; a larger leaf blade, oblong, 30-50 × 5-8 cm, glabrous; a globose to ovoid inflorescence, arising near the base of rhizome; tomentose outer surface of bract; a 3-toothed bracteole, outer surface hairy; and a smaller filament, yellowish and glabrous. The detailed morphological description, distribution and ecology information, conservation status and a colour plate of...
  • item.jpg
  • Journal Article

  • Synthesis and Spectroscopic Characterizations of Ni(II) Thiosemicarbazone Bearing Anthracene

    • Authors: Dinh, Thi Hien; Khuat, Thi Thuy Ha; Nguyen, Tien Dat; Dinh, Thi Thao; Nguyen, Minh Hai (2021)

  • The X-ray structure of 9-anthraldehyde-4-methyl-3-thiosemicarbazone was firstly determined. The Ni(II) complex with this ligand was prepared upon reaction with chloride salt. Mass spectrometry result confirms correct formulation of the complex. Unusual 1H NMR signal pattern of anthracene moiety reveal cis arrangement cemented by intramolecular – stackings between aromatic rings. As a result of this interaction, the electronic structure of anthracene ring is perturbed and gives rise to structureless and broad absorption and emission bands
  • item.jpg
  • Journal Article

  • Isolation and Selection of Purple Non-Sulfur Bacteria for Nutrient Rich Biomass Production from Wastes

    • Authors: Do, Binh Minh; Pham, The Hai (2021)

  • Purple nonsulfur bacteria (PNSB) are anoxygenic photosynthetic bacteria, which are able to photoheterotrophically grow in the presence of excessive nutrients. Hence, PNSB can convert organic components, in waste waters into nutrient rich biomass. This suggests the feasibility of converting wastes into valuable products. In this research, method for isolation of PNSB was optimized, and subsequently used for the isolation of PNSB from domestic waste and pond water samples taken in Hanoi. In addition, the effects of carbon and nitrogen sources and types of waste on biomass and nutrients (protein and carotenes) were also investigated. Four PNSB strains were isolated and based on comparat...
  • item.jpg
  • Journal Article

  • Piper Ribesioides Wall., a Newly Recorded Species for the Flora of Vietnam

    • Authors: Luu, Dam Ngoc Anh; Nguyen, Quang Hung; Nguyen, Trung Thanh; Do, Van Truong (2021)

  • We here reported a newly recorded Piper species for the flora of Vietnam, namely Piper ribesioides Wall. (Piperaceae). This species is most morphologically similar to P. politifolium C.DC. by sharing glabrous plants and fruits with a stipe, but it differs from the latter having a monoecious habit (vs. dioecious), stamens 4 (vs. 2), and a cordate leaf base with equal or subequal lobes (vs. oblique with unequal lobes). Descriptions, illustrations, information on ecology, and taxonomic notes of the species is provided.
  • item.jpg
  • Journal Article

  • Application of Next Generation Sequencing Genetic Studies of Urea Cycle Disorders

    • Authors: Nguyen, Thi Thu Huong; Nguyen, Thi Kim Lien; Nguyen, Huy Hoang (2021)

  • Rối loạn chu trình chuyển hóa urê (UCD) là rối loạn chuyển hóa bẩm sinh, hiếm gặp, gây ra do đột biến trên các gen mã hóa cho 6 enzyme: carbamoyl phosphate synthase I (CPSI), ornithine transcarbamylase (OTC), argininosuccinate synthase (ASS1), argininosuccinate lyase (ASL), arginase (ARG1), N-acetyl glutamate synthase (NAGS) và 2 hệ thống vận chuyển, ornithine translocase (ONT1), citrin, của chu trình chuyển hóa urê. Sự ứ đọng amoniac là nguyên nhân dẫn đến các triệu chứng thần kinh nghiêm trọng, thậm chí tử vong. Các thăm khám lâm sàng, xét nghiệm hóa sinh là cần thiết, nhưng chưa đủ thông tin để đưa ra chẩn đoán chính xác. Phân tích đột biến là phương pháp hữu hiệ...
  • item.jpg
  • Journal Article

  • Platinum(II) Complex of Benzimidazole-Derived N-Heterocyclic Carbene: Synthesis, Characterization, and Photophysical Properties

    • Authors: Nguyen, Van Ha; Trieu, Thi Nguyet; Doan, Thanh Dat (2021)

  • Platinum(II) complex of benzimidazole-derived N-heterocyclic carbene with formula [PtCl2(DMSO)(bimy)] was successfully synthesized via one pot reaction between 1,3-diisopropyl benzimidazolium (bimy×HBr), Ag2O and [PtCl2(DMSO)] (DMSO = dimethyl sulfoxide). The complex was characterized by means of multinuclear (1H and 13C{1H}) magnetic resonance and single crystal X-ray diffraction (XRD). The UV-Vis absorption spectra of the compound show an absorption shoulder above 300 nm. Under excitation by 285 nm UV lamp, solution of the compound in DCM is highly emissive showing emission maxima at around 410 nm. DFT calculations were also carried out for the complex to gain insight on its electro...
  • item.jpg
  • Journal Article

  • The Diversity of Famlily Lauraceae Juss. in Pu Mat National Park, Nghe An Province = Đa dạng họ Long não (Lauraceae Juss.) ở Vườn Quốc gia Pù Mát, Nghệ An

    • Authors: Do, Ngoc Dai; Le, Thi Huong; Dao, Thi Minh Chau; Nguyen, Tien Cuong; Nguyen, Cong Truong; Le, Thi Hong (2021)

  • Kết quả nghiên cứu họ Long não (Lauraceae) ở Vườn Quốc gia (VQG) Pù Mát, tỉnh Nghệ An, đã xác định được 90 loài, 13 chi, trong đó 1 chi và 22 loài bổ sung cho danh lục Pù Mát (2017). Các chi đa dạng nhất tại khu vực nghiên cứu là Cinnamomum-26 loài, Litsea - 24 loài, Lindera-8 loài. Có 4 loài được ghi trong Sách Đỏ Việt Nam (2007): Bộp quả bầu dục (Actinodaphne elliptibacca Kosterm.), Vù Hương (Cinnamomum balansa Lecomte), Re cam bốt (Cinnamomum cambodianum Lecomte) và Re hương (Cinnamomum parthenoxylon (Jack.) Meisn.). Các loài cây họ Long não ở khu vực nghiên cứu có các giá trị sử dụng khác nhau như cho gỗ với 60 loài, cho cho tinh dầu với 50 loài, làm thuốc ...
  • item.jpg
  • Journal Article

  • Electronic Structures of Homodinuclear Platinum(II), Palladium(II) and Gold(I) Complexes Featuring Janus-type Benzoxazolin-2-ylidene Linkers

    • Authors: Nguyen, Van Ha; Nguyen, Thi Thu Hang (2021)

  • Electronic structures of a series of three homodinuclear platinum(II), palladium(II) and gold(I) complexes featuring Janus-type benzoxazolin-2-ylidene bridges and N,N-diisopropyl benzimidazolin-2-ylidene auxiliary ligands have been investigated. The gas-phase molecular structures of all compounds were first optimized using B3PW91 functional and SDD/6-31G(d) combination of basis sets. The nature of their frontier orbitals were then examined. The higher energy occupied molecular orbitals are predominantly d orbital of the metal in combination with orbital of N,N-diisopropyl benzimidazolin-2-ylidene. On the other hand, the lower energy unoccupied molecula...
  • item.jpg
  • Journal Article

  • Sequencing Coding Region and in Silico Structural Analysis of Protein Hexon of HAdV-3 Causing Conjunctivitis in Vietnam

    • Authors: Nguyen, Van Sang; Nguyen, Thi Thu Huyen; Le, Tuan Anh (2021)

  • Human adenovirus (HAdVs) are responsible for about 65-90% of viral conjunctivitis. Understandings of HAdVs bring promises in prevention, treatments, and biological preparations. However, thorough researches on structural proteins of HAdVs are still limited in Vietnam. In this study, we have sequenced the entire coding gene of protein hexon from HAdV-3 causing conjunctivitis in Vietnam and compared with the reference sequence in NCBI database. We detected 42 DNA variants, of which, 11 resulted in amino acid substitutions. Simulation of HAdV-3 hexon structure showed that all 11 substitutions located in crucial positions. This result revealed high risks from hexon gene variants of HAdV-3...
Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 1149