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  • SAGE Publications  (3)
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  • SAGE Publications  (3)
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  • 1
    Online Resource
    Online Resource
    Antifungal Activity of β-Pinene-Based Hydronopyl Quaternary Ammonium Salts Against Phytopathogenic Fungi
    SAGE Publications ; 2020
    In:  Natural Product Communications Vol. 15, No. 8 ( 2020-08), p. 1934578X2094836-
    Details
    In: Natural Product Communications, SAGE Publications, Vol. 15, No. 8 ( 2020-08), p. 1934578X2094836-
    Abstract: β-Pinene can be used as a cheap source to synthesize a large number of high value-added derivatives. In this study, a series of β-pinene derivatives was prepared, and the antifungal activities of the compounds were assessed against phytopathogenic fungi. Eight N-alkyl hydronopyl diethyl ammonium halide salts were synthesized by the reaction of hydronopyl diethyl ammonium halide with 8 halogenated alkanes. The structures of the synthesized products were characterized by Fourier-transform infrared spectroscopy and nuclear magnetic resonance spectroscopy and mass spectrometry. The antifungal activities of these derivatives were tested against 11 plant pathogens, and the preliminary structure-activity relationship is discussed. Some derivatives exhibited moderate to significant antifungal activity due to the fusion of the hydronopyl, a long-chain alkyl, bromine, and iodine anionic groups. In contrast to the structure-activity relationship of compounds 2a, 2b, and 2c, iodine ions in 2f, 2g, and 2f had a significant effect on enhancing the antifungal activity against Colletotrichum gloeosporioides, S clerotinia sclerotiorum, Phytophthora capsici, Phomopsis, Sphaeropsis sapinea, Glomerella cingulata, and Fusicoccum aesculi. A higher molecular weight could increase the antifungal activity against Fusarium proliferatum, Alternaria kikuchiana, Sclerotinia sclerotiorum, P. capsici, Phomopsis, and S. sapinea. Compounds 2d and 2e exhibited broad-spectrum antifungal activity against the tested strains. These derivatives are expected to be used as precursor molecules for novel pesticide development in further research.
    Type of Medium: Online Resource
    ISSN: 1934-578X , 1555-9475
    URL: Article
    DOI: 10.1177/1934578X20948365
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2020
    detail.hit.zdb_id: 2430442-6
    SSG: 15,3
    Location Call Number Limitation Availability
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Understanding consumers’ purchase intention towards online paid courses
    SAGE Publications ; 2023
    In:  Information Development Vol. 39, No. 1 ( 2023-01), p. 19-35
    Details
    In: Information Development, SAGE Publications, Vol. 39, No. 1 ( 2023-01), p. 19-35
    Abstract: With the unprecedented development of information and communication technologies, online learning is increasingly seen as an important channel for knowledge acquisition. Although knowledge payment platforms have attracted a considerable number of consumers, little is known about the determinants of purchase intention of online learning consumers for online paid courses (OPCs). In this study, we identify the mechanism underlying online learning consumers’ purchase intentions towards online paid courses (OPCs) based on outcome expectation and trust. We further examine the antecedents of performance expectation and trust from a learning-oriented perspective. Results indicate that trust and performance expectation play positive roles in consumer purchase intention. Moreover, perceived lecturer expertise, prior learning experience, and personal trial experience are positively associated with trust and performance expectation, which in turn influence purchase intention towards OPCs. The data were collected using a questionnaire survey of 443 users of knowledge payment platforms, and the proposed model was analysed through structural equation modelling. This study enhances the theoretical understanding of why consumers purchase OPCs in the knowledge payment context. For information system practice, these findings provide new insights for managers on how to conduct knowledge product transactions effectively.
    Type of Medium: Online Resource
    ISSN: 0266-6669 , 1741-6469
    URL: Article
    DOI: 10.1177/02666669211027206
    RVK:
    AN 10100
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2023
    detail.hit.zdb_id: 89692-5
    detail.hit.zdb_id: 2025059-9
    SSG: 24,1
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    Online Resource
  • 3
    Online Resource
    Online Resource
    β-Pinene Derived Products With Enhanced In Vitro Antimicrobial Activity
    SAGE Publications ; 2021
    In:  Natural Product Communications Vol. 16, No. 2 ( 2021-02), p. 1934578X2199221-
    Details
    In: Natural Product Communications, SAGE Publications, Vol. 16, No. 2 ( 2021-02), p. 1934578X2199221-
    Abstract: The development of new antimicrobials has always been a research hotspot. In this study, β-pinene-based derivatives were synthesized, and their antimicrobial activity was evaluated. The purpose was to develop some novel, promising new fungicides. Three β-pinene derivatives containing bis-hydronopyl were prepared, and their antifungal and antibacterial activities were evaluated against 6 plant pathogenic fungi and 4 bacterial species; a preliminary structure-activity relationship is discussed. The results indicated that the derivatives containing the blend of alkyl group and bis-hydronopyl had potent inhibitory activities against plant fungal pathogens and bacteria. Among these molecules, bis-hydronopyl dimethyl ammonium bromide showed excellent effects on Colletotrichum acutatum with a half-maximal effective concentration of 0.538 µg/mL, which was lower than that of carbendazim. Scanning electron microscope showed that after administration of bis-hydronopyl dimethyl ammonium bromide (compound 3a), the C. acutatum mycelia were sunken and deformed in comparison with the control group. Furthermore, the inhibitory activities of the methyl derivatives against the plant pathogens were better than those of the ethyl derivatives. These results provide new insights into the inhibition of fungi and bacteria by β-pinene derivatives, which may lead them to be used as precursor molecules for novel pesticides and antimicrobials in further research.
    Type of Medium: Online Resource
    ISSN: 1934-578X , 1555-9475
    URL: Article
    DOI: 10.1177/1934578X21992218
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2021
    detail.hit.zdb_id: 2430442-6
    SSG: 15,3
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
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