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N-tert-Butyl-2-(1-acetoxy-2-fluoro-1-butyl) benzenesulfonamide 의 결정 및 분자구조
이재혁,김문집,김대황 순천향대학교 기초과학연구소 1997 순천향자연과학연구 논문집 Vol.3 No.1
The crystal structure of N-tert-Butyl-2-(1-acetoxy-2-fluoro-1-butyl) benzenesulfonamide has been determined from single crystal X-ray diffraction study ; C16H24FNO4S, Orthorhombic, Pbca, a=14.652(5)Å, b=18.477(2)Å, c=13.261(2)Å, α=β=γ=90°, V=3590.1(14)ų, T=296(2)K, Z=8, Mok α(λ=0.71069Å). The molecular structure was solved by direct method and refined by full-matrix least squares to a final R=5.55% for 1628 unique observed F0>4σ(F0) reflections and 208 parameters. The conformation of the molecule is stabilized by an intramolecular N(19)-H(19)...O(10) hydrogen bond.
高麗人蔘 種子 開匣과정에서 內生 Abscisic acid와 Indole-3-acetic acid 수준변동
黃台益,李載窪 全南大學校 農漁村開發硏究所 1992 農業科學技術硏究 Vol.27 No.-
人蔘種子 개갑중 식물 홀몬의 생리적 생화학적 기전을 구명하기 위한 첫번째 연구로서 ABA 와 IAA 에 대한 단크론 항체를 이용한 ELISA 에 의해서 ABA와 IAA 의 수준 변동을 탐색하였던바 그 결과를 요약하면 1. 인삼종자 개갑중 수분 흡수는 처음 30일까지 급속하게 일어났으며 15℃, 20℃ 에서 높았으며 저온조건에서는 흡수가 느리게 일어났다. 2. 개갑중 배 생장은 고온조건하에서는 90일 후에 75%까지 생장 항였으며 5℃ ,10℃에서는 극히 낮은 배생장을 보였을 뿐이다. 3. 인삼종자 중의 ABA와 IAA 의 함량은 각각 382.1ng 과 78.3pg 이었다. 4. 인삼종자 중의 ABA는 개갑중에 감소하였다 5℃ ,10℃ 는 약100ng 정도 밖에 감소하지 않았다.그러나 15℃,20℃에서는 전함량 중의 잔류량이 100ng 정도로 감소하였다. 5. 인삼종자 중의 IAA 는 종자중에 극히 낮은 함량을 가지고 있었으나 개갑 과정에서 증가 하였다. 낮은 온도 조건에서는 별로 증가 하지 않았으나 15℃,20℃에서는 개갑 기간과 배생장에 비례적으로 증가하였다. 6. 상기와 같은 결과에 따라서 수분 흡수와 온도는 개갑에 주 요인으로 작용하며 ABA와 IAA는 개갑에 직접 관계되어 있음이 확인되었다. We examined the dehiscence process of Korea ginseng seed (Panax ginseng c.A.Meyer) grown in petri dish. The ginseng seeds and seedlings were analyzed for abscisic acid (ABA)and indole-3-acetic acid(IAA) by ELISA with specific monoclonal antibodies, water absorption and embryo growth. The results obtained were summarized as follows. Water-absorbing rate during dehiscence in plating ginseng seed was rapidly increased at 15℃ and 20℃ for 30 days. The embryo during dehiscence process of ginseng seed was elongated to 75% at 15℃ treated. The content of ABA and IAA in ginseng seed were 382.1ng/dry weight and 78.3pg/dry weight respectively. An amount of ABA decresed in seed was about 100ng/dry weight after seed imbition at 5℃ and 10℃ and amount of ABA remained under high temperature(15℃, 20℃) was 100ng/ dry weight. A low content of IAA in seed appeared to increase a direct proportion to the dehiscence time and embryo growth. The results indicated that water-absorbing and germinating temperature in treated seed were a major factor for dehisccence and changes of ABA and IAA level were influenced to dehiscence of ginseng.
Lee, Jae-Hyun,Choi, Soon-Hyung,Patole, Shashikant P.,Jang, Yamujin,Heo, Keun,Joo, Won-Jae,Yoo, Ji-Beom,Hwang, Sung Woo,Whang, Dongmok American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.7
<P>We synthesized thermally stable graphene-covered Ge (Ge@G) nanowires and applied them in field emission devices. Vertically aligned Ge@G nanowires were prepared by sequential growth of the Ge nanowires and graphene shells in a single chamber. As a result of the thermal treatment experiments, Ge@G nanowires were much more stable than pure Ge nanowires, maintaining their shape at high temperatures up to 850 °C. In addition, field emission devices based on the Ge@G nanowires clearly exhibited enhanced thermal reliability. Moreover, field emission characteristics yielded the highest field enhancement factor (∼2298) yet reported for this type of device, and also had low turn-on voltage. Our proposed approach for the application of graphene as a protective layer for a semiconductor nanowire is an efficient way to enhance the thermal reliability of nanomaterials.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-7/am5001294/production/images/medium/am-2014-001294_0004.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5001294'>ACS Electronic Supporting Info</A></P>
One-pot size-controlled growth of graphene-encapsulated germanium nanocrystals
Lee, Jae-Hyun,Lee, Eun-Kyung,Kang, Seog-Gyun,Jung, Su-Ho,Son, Seok-Kyun,Nam, Woo Hyun,Kim, Tae-Hoon,Choi, Byong Lyong,Whang, Dongmok Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.440 No.-
<P><B>Abstract</B></P> <P>To realize graphene-encapsulated semiconductor nanocrystals (NCs), an additional graphene coating process, which causes shape destruction and chemical contamination, has so far been inevitable. We report herein one-pot growth of uniform graphene-germanium core–shell nanocrystals (Ge@G NCs) in gram scale by the addition of methane as a carbon source during the thermal pyrolysis of germane. The methane plays a critical role in the growth of the graphene shell, as well as in the determination of the nucleation density and diameter of the NCs, similar to a surfactant in the liquid-phase growth of monodisperse NCs. By adjusting the gas ratio of precursors, a mixture of germane and methane, we can control the size of the Ge@G NCs in the range of ∼5–180 nm. The Ge@G NCs were characterized by various microscopic and spectroscopic tools, which indicated that the Ge core is single crystalline, and is completely covered by the graphene shell. We further investigated the merits of the graphene shell, which can enhance the electrical conductivity of nanocrystalline materials.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The Ge-graphene core-shell nanocrystals (Ge@G NCs) are synthesized in gram scale. </LI> <LI> The role of CH<SUB>4</SUB> is critical for determination of the density and diameter of the NCs. </LI> <LI> The size of the Ge@G NCs can be controlled by tuning the gas ratio of GeH<SUB>4</SUB> and CH<SUB>4</SUB>. </LI> <LI> The graphene shell enhances the electrical conductivity of NCs. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Thermoelectric Properties of Nanowires with a Graphitic Shell.
Lee, Jong Woon,Lee, Eun Kyung,Kim, Byung Sung,Lee, Jae Hyun,Kim, Hee Goo,Jang, Hyeon Sik,Hwang, Sung Woo,Choi, Byoung Lyong,Whang, Dongmok Wiley-VCH 2015 ChemSusChem Vol.8 No.14
<P>A thermoelectric device that can generate electricity from waste heat can play an important role in a global energy solution. However, the strongly correlated thermoelectric properties have remained a major hurdle for the highly efficient conversion of thermoelectric energy. Herein, the electrical and thermal properties of Si and SiO2 nanowires with few-layer graphitic shells are demonstrated; these structures exhibit enhanced electrical properties but no increase in thermal conductivity. The main path of the phonons through the structures is the core nanowire, which has a large cross-sectional area relative to that of the graphitic shell layer. However, the electrical conductivities of the nanowires with shell structures are high because of the good electrical conductivity of the graphitic shell, despite its small cross-sectional area.</P>