• 한국전기화학회:학술대회논문집
• /
• 한국전기화학회 1999년도 제2회 총회 및 춘계학술발표회
• /
• pp.14-14
• /
• 1999

• 한국작물학회지
• /
• 제56권3호
• /
• pp.264-272
• /
• 2011

벼에서 인산흡수 관련 유전자를 이용하여 무기양분이 제한된 토양에서도 작물의 생장을 극대화시키는 무기영양 이용능력이 강화된 차세대 작물을 개발하고자 인산흡수력이 강화된 OsPT(Phosphate transporter)1, 4, 7, 8-OX 계통을 세대진전시켜 T5 세대에서 유전자의 안정적 도입을 확인하였다. 형질전환 계통들의 뿌리발달 상황을 조사해 본 결과, T/R율이 모든 형질전환 계통에서 동진벼보다 높은 경향을 보였다. OsPT1-OX 및 OsPT4-OX 계통은 모본인 동진벼에 비해 전반적으로 초장, 간장 및 수장은 짧았으나 OsPT7-OX 및 OsPT8-OX 계통은 주요 농업적 특성이 비슷하였다. 인산 무시용 시 OsPT1, 7, 8-OX 계통들은 출수기가 1~2일 정도 조숙화되었으나 인산흡수량이 과다하였던 OsPT4-OX계통은 오히려 2일 정도 만숙화되어 출수기 반응이 뚜렷하였다. 인산 무시용시 관행시비 대비 쌀수량 감소율은 동진벼가 18%로 컸으나 OsPT1-OX, 7, 8계통들은 각각 10, 15, 9%에 불과하였다. 인산 무시용시 모본인 동진벼에 비해 OsPT1, 4, 7, 8-OX 계통들은 출수기의 식물체 인산흡수량이 각각 104, 128, 26, 14% 증가하였으나 질소함량은 10, 16, 12, 5% 증가에 그쳤다. 동진벼에 비하여 P/N율이 높고 간장이 짧은 OsPT1-OX과 4-OX 계통은 (2N)P시험구에서 간장이 각각 6, 4 cm 회복되었다. OsPTs-OX의 인산함량(%)을 분석한 결과, OsPT4-OX >1-OX >7-OX >8-OX 순으로 나타난 반면, OsPT1-OX이 인산흡수율이 높으면서도 생육의 변화가 적어 개체당 총 인산흡수량(g/개체)은 OsPT1-OX >4-OX >7-OX >8-OX 순으로 OsPT1-OX이 인산흡수증진 신품종으로 가장 유망하였다. OsPT1-OX계통의 부위별 인산흡수량은 줄기와 잎에서 동진벼의 2.4배, 2.2배였으나 현미와 영에서는 차이가 없었다.

• 한국전기화학회:학술대회논문집
• /
• 한국전기화학회 2002년도 연료전지심포지움 2002논문집
• /
• pp.179-182
• /
• 2002

The electrooxidation of methanol was studied using Pt, PtRu(1:1), PtNi(1:1), PtRh(1:1) and PtOs(1:1) alloy nanoparticles for application as electrocatalysts. The effects of the second metals in the electrocatalytic activity was investigated using cyclic voltammetry (CV), chronoamperometry (CA), X-ray photoelectron spectroscopy (XPS). There are the metallic and oxygen states in the PtRu and PtOs electrocatalysts . In the XPS of PtRu and PtOs alloy nanoparticles, the oxygen sources were dominant as the second metal's effects. Negative shifts of the binding energies of Pt for the PtNi, PtRh alloy nanoparticles were determined by XPS measurements, which can be explained by electronic effects.

• Bulletin of the Korean Chemical Society
• /
• 제17권11호
• /
• pp.1061-1065
• /
• 1996

The charge transfer compounds of tetrathiafulvalene (TTF) with the general formula of (TTF)mMCln, (M=Au, Pt, Ir, Os) were prepared by the direct reaction using excess HAuCl4·3H2O, H2PtCl6·xH2O, H2IrCl6·xH2O and H2OsCl6 respectively. The powdered electrical conductivities (σrt) at room temperature are given as follows; (TTF)3AuCl2, 4.53×10-3; (TTF)3.5AuCl2, 6.37×10-3; (TTF)3PtCl4, 5.51×10-4; (TTF)2IrCl4, 2.40×10-5; (TTF)OsCl4·1/2C2H5OH, 4.46×10-7 Scm-1. Magnetic susceptibility, electronic (UV-Vis.), vibrational (IR) and EPR spectroscopic evidences indicate that there is incomplete charge transfer from the TTF donor to gold, platinum, and iridium respectively, and that there is essentially complete charge transfer to osmium, thereby resulting a relatively low electrical conductivity in osmium compound. The EPR and magnetic susceptibility data reflect that the metals are in diamagnetic Au(Ⅰ), Pt(Ⅱ), Ir(Ⅲ), and Os(Ⅱ) oxidation states, and the odd electrons are extensively delocalized over the TTF lattices in each compound.

• 생명과학회지
• /
• 제18권4호
• /
• pp.488-493
• /
• 2008

Phosphate, a favorable phosphorous form for plant, is one of major nutrient elements for growth and development in plants. Plants exhibit various physiological and biochemical responses in reaction to phosphate starvation in order to maintain phosphate homeostasis. Of them, expression of high affinity phosphate transporter gene family and efficient uptake of phosphate via them is a major physiological process for adaption to phosphate deficient environment. Although the various genetic resources of high affinity phosphate transporter are identified recently, little is known about their functions in plant that is prerequisite information before applying to crop plants to generate valuable transgenic plants. We demonstrated that Arabidopsis transgenic plants over-expressing two different high affinity phosphate transporter gens, OsPT1 and OsPT7, derived from rice, exhibit better growth responses compared with wild-type under phosphate starvation condition. Specially, OsPT7 gene has proven to be more effective to generate Arabidopsis transgenic plant tolerant to phosphate deficiency than OsPT1. Furthermore, the expression level of AtPT1 gene that is one of reporter genes specifically induced by phosphate starvation was significantly low compared with wild-type during phosphate starvation. Taken together, these results collectively suggest that over expression of OsPTl and OsPT7 genes derived from monocotyledonous plant function efficiently in the dicotyledonous plant, relieving stress response caused by phosphate starvation and leading to better growth rate.

• 대한간호
• /
• 제31권5호
• /
• pp.29-38
• /
• 1992

The purpose of this is to find the anxiety score of OHS pt's family and general surgery pt's family and to offer basic data. The subjects of this study were 80 : 40 were OHS pt's family in Seoul Hospital and remaining 40 were OS pt's family in Capital Hospital. The data was collected between March 1, through May 30, 1992. The instruments used for this study were Zung's The Self-Rating Anxiety Scale. The collected daLa were analyzed using percentage, descriptive statistics, $X^2-test$, t-test and Two-way Anova. The finding's were as followed: 1. Test of hypothesis "The anxiety score of the Ol-lS pt's family were similar to as pt's family" was rejected (L=0.772 P>.05) 2. The mean score of anxiety of the OHS pt's family was 1.772, The mean score of anxiety of the OS pt's family was 1,790. 3. The relationship between anxiety of the OHS pt's family and GS pt's family and family's age was significant (P<.Ol) and the relationship between anxiety and age interaction effect. (F=242.0 P<.01) In conclusion, the anxiety score of the OI-IS pt's finding and GS pt's family was all high.

• 대한화학회지
• /
• 제45권5호
• /
• pp.442-447
• /
• 2001

Octamethylenethiafulvalene(OMTTF)와 $HAuCl_4{\cdot}3H_2O$를 THF 용액 내에서 직접 반응시켜 $(OMTTF)AuCl_4$를 합성하였다. $(OMTTF)_2PtCl_4,\; (OMTTF)_2\;IrCl6{\cdot}2H_2O,\; (OMTTF)OsCl5{\cdot}THF$ 등은 각각 $H_2PtCl_6{\cdot}xH_2O,\;H_2IrCl_6{\cdot}xH_2O$ 및 $H_2OsCl_6$를 사용하여 유사한 방법으로 합성하였다. 합성된 화합물들은 자기적(EPR, 자화율 측정), 분광학적(IR, UV-Vis), 전기화학적(CV) 특성과 전기전도도를 측정하였다. 상온에서의 분말 전기전도도는 모두 ~$10^{-7}\; S{\cdot}cm^{-1}$ 이하의 낮은 전기전도도를 나타내었다. 합성 과정에서 OMTTF로부터 Au, Pt, Ir, Os 금속 화합물로 전하 이동이 이루어져 OMTTF는 완전히 이온화된 $OMTTF^+$ 양이온 라디칼로 존재하였다. $OMTTF^+$ 양이온 라디칼의 안정성은 산화·환원 전위 값에서 확인하였다. 자화율 결과로부터 $(OMTTF)_2IrCl_6{\cdot}2H_2O$ 및 $(OMTTF)OsCl5{\cdot}THF$에서는 $OMTTF^+$ 이온에 존재하는 홀전자와 중심 금속(Ir 및 Os)에 편재화된 홀전자들 사이에는 강한 반강자성 상호작용이 존재함을 알 수 있었다.

• 한국작물학회:학술대회논문집
• /
• 한국작물학회 2022년도 추계학술대회
• /
• pp.133-133
• /
• 2022

Temperature is a crucial environmental factor for rice cultivation due to the climate change and can influence the rice growth and development. Therefore, the effect of temperature on plant growth characters was examined during the vegetative stage. Plants were grown under three different temperatures: 23℃/13℃ for 18℃, 26℃/16℃ for 21℃ and 29℃/19℃ for 24℃ in the phytotron. The temperature was treated after transplanting and ended in early panicle initiation stage. Heading date of the two varieties were strongly affected by the temperature and were delayed in the 18℃. The plant height in the 18℃ was 21 % shorter than the 21℃ and 24℃ and the tiller and leaf number were increased in the 18℃. All the growth rates of the characters were the slowest in 18℃. The stem dry weight was significantly increased in 18℃. Nitrogen content was increased in the leaves of 18℃ whereas available phosphate and potassium content was found to be increased in the stems of 21℃ and 24℃. OsNRT 2.1 was overexpressed in the leaves and stems of 18℃ and OsNRT2.3a could be expressed in 18℃ and 21℃ temperatures whereas more expressed in 21℃. OsPT1 and OsPT6 could be expressed in the leaf of 18℃ and 24℃ but could be expressed in the stem of 18℃. OsHAK1 and OsHAK5 could be overexpressed in the leaves and stems of 18℃. For hormone, OsCKX2 gene was found to be up regulated in the leaves of 18℃ and OsIAA1 gene could be expressed more in the stem of 24℃.

• 한국자기학회:학술대회 개요집
• /
• 한국자기학회 2008년도 Asian Magnetics Conference
• /
• pp.191.2-191.2
• /
• 2008

• 고려인삼학회:학술대회논문집
• /
• 고려인삼학회 2002년도 학술대회지
• /
• pp.376-384
• /
• 2002

Object To find out which of the 27 ginsenosides isolated from Panax ginseng C.A. Mey that may inhibit the proliferation of human osteosaocoma cell line $U_2OS$. Methods Effects of each individual ginsenoside on the proliferation of $U_2OS$ cell were studied by determining the viability of cancer cells during culture with or without the presence of the test compound. DNA assay was determined by flow cytometry. Results Ginsonosides -Ro, $-Rh_l,\;-Rh_2,\;-F_1\;and\;-L_8$ at concentrations of 5 ,umol/L could obviously suppress the proliferation of $U_2OS$ cells while ginsenosides $-Rg_1,\;-F_3,$ -Rf, PPT and PT significantly inhibited the cancer cells. Flow cytometry revealed that ginsenosides $-Ro,-Rg_1-Rf,-F_1-Rh_2,PPT$ and PT induced cell cycle arrest at $G_0/G_1$ phase with obvious decrease of cell count at Sand $G_2+M$ phase, Moreover, ginsenosides $-Rf_1,-Rg_1,\;-F_1$ and PPT induced significantly high rates of cell death as compared with the control. Conclusion These data suggested that ginsenosides inhibited $U_2OS$ proliferation Via cell cycle arrest or induction of cell death.