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Long-chain alcohols derived from the microalga Monoraphidium

  • Yang, Xuewei;Dai, Xin;Zhang, Rui;Shao, Cong;Geng, Shu;Chen, Guangyi;Liu, Xianhua;Wang, Guangyi
    • Advances in Energy Research
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    • v.1 no.2
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    • pp.107-116
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    • 2013
  • This study was to investigate the composition and characteristics of long-chained alcohols extracted from the algal strain Monoraphidium 3s35. The production of biomass was optimized using different cultivation methods. Under the aerated growth condition, this strain yielded up to 37.26% extracts of dry weight and $576mgL^{-1}$ biomass. The major compounds of the extracts are mainly long-chained alcohols (89.24%), with carbon chain length ranging from 12 to 20. Interestingly, or the long-chained alcohols, 3-(2-Methoxyethyl)-1-nonanol, 3,7,11,15-Tetramethyl-2-hexadecen-1-ol and oleyl alcohol accounted for 53.68%, 23.45%, and 12.11%, respectively. Because of their amphipathic nature, these long-chained alcohols have been widely used in bioenergy production and cosmetics industry. Furthermore, Monoraphidium 3s35 produced 9.73% of $C_{17}$ and $C_{20}$ alkanes, which can be used as an important supplement for the petrodiesel-like fuel.

Improvements of the luminous efficiency of mercury-free fluorescent lamps via structural and complex gas mixture changes

  • Oh, Byung-Joo;Jung, Jae-Chul;Seo, In-Woo;Kim, Hyuk;Whang, Ki-Woong
    • 한국정보디스플레이학회:학술대회논문집
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    • 2008.10a
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    • pp.809-812
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    • 2008
  • Structural parameter variation effects (changing the coplanar gap under different discharge dimensions) and use of complex gas mixtures (He, Ne, Ar and Xe) in mercury-free fluorescent lamps are studied in this paper. Pure Neon gas is the best buffer gas for obtaining high luminous efficiency in mercury-free fluorescent lamps. It is shown that with a shorter coplanar gap (30mm), a high luminous efficiency can be obtained at low operating voltage, as well as high luminance uniformity and stable discharge with a Ne-Xe 20% gas mixture.

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A New Steroidal Glycoside from Allium macrostemon Bunge

  • Kim, Yun Sik;Cha, Joon Min;Kim, Dong Hyun;Lee, Tae Hyun;Lee, Kang Ro
    • Natural Product Sciences
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    • v.24 no.1
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    • pp.54-58
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    • 2018
  • A phytochemical investigation of Allium macrostemon Bunge (Liliaceae) afforded the new pregnane steroidal glycoside, named allimacroside F (1), along with three known glycosides, benzyl-O-${\alpha}-{\text\tiny{L}}$-rhamnopyranosyl-($1{\rightarrow}6$)-${\beta}-{\text\tiny{D}}$-glucopyranoside (2), phenylethyl-O-${\alpha}-{\text\tiny{L}}$-rhamnopyranosyl-($1{\rightarrow}6$)-${\beta}-{\text\tiny{D}}$-glucopyranoside (3), (Z)-3-hexenyl-O-${\alpha}-{\text\tiny{L}}$-rhamnopyranosyl-($1{\rightarrow}6$)-${\beta}-{\text\tiny{D}}$-glucopyranoside (4). The identification and structural elucidation of a new compound (1) was carried out based on spectral data analyses ($^1H-NMR$, $^{13}C-NMR$, $^1H-^1H$ COSY, HSQC, HMBC, and NOESY) and HR-FAB-MS.

Highly Enantioselective Addition of Diethylzinc to Aldehydes Catalyzed by Novel Chiral tert-Amino Alcohols

  • Zhang, Cong-Hai;Yan, Sheng-Jiao;Pan, Sheng-Qiang;Huang, Rong;Lin, Jun
    • Bulletin of the Korean Chemical Society
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    • v.31 no.4
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    • pp.869-873
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    • 2010
  • A series of novel chiral tert-amino alcohols 4a-h derived from enantiomerically pure phenylalanine were synthesized efficiently and used as chiral ligands in the catalytic enantioselective ethylation of aldehydes with diethylzinc (diethylzinc-to-aldehyde addition). The use of 10 mol % of the amino alcohols led to the corresponding sec-alcohols with excellent enantioselectivities (up to 100% ee) and high yields.