• Bulletin of the Korean Chemical Society
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• 제6권4호
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• pp.214-217
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• 1985

Platinum(II) complexes of R-2,2'-diaminobinaphthyl (R-dabn), [Pt(R-dabn)(H2O)2]Cl2, [Pt(R-dabn)(R-Pn)]Cl2, [Pt(R-dabn)(R-bn)]Cl2, and platinum(II) complexes of S-2,2'-diaminobinaphthyl (S-dabn), [Pt(S-dabn)(H2O)2]Cl2, [Pt(S-dabn)(S-Pn)]Cl2, and [(Pt(S-dabn)(S-bn)]Cl2 have been prepared. (R-Pn and S-Pn are, respectively R- and S isomer of 2,3-diaminobutane). R-Pn and S-bn are, respectively R and S isomer of 2,3-diaminopropane). In the vicinity of the B-absorption band region of dabn, the circular dichroism spectra of platinum(Ⅱ) complexes of R-dabn series show a positive B-band followed by a negative higher energy A-band, which is generally understood as the splitting pattern for a ${\lambda}$ conformation, while the circular dichroism spectra of platinum(Ⅱ) complexes of S-dabn series show a negative B-band followed by a positive higher energy A-band in the long-axis polarized absorption region as expected for a $\delta$ conformation.

• Bulletin of the Korean Chemical Society
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• 제5권6호
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• pp.237-240
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• 1984

2,2'-Diaminobiphenyl platinum (II) complexes of optically active trans-1,2-diaminocyclohexane and 1,2-diaminopropane, [Pt(S,S-chxn)(dabp)]Cl2, [Pt(R,R-chxn)(dabp)]$C_{12}$, [Pt(S-pn)(dabp)]$C_{l2}$, and [Pt(R-pn)(dabp)]Cl2, where S,S-chxn and R,R-chxn are, respectively, S and R isomers of trans-1,2-diaminocyclohexane, and S-pn and R-pn are, respectively, S and R isomers of 1,2-diaminopropane, and dabp the 2,2'-diaminobipheny, have been prepared. The dabp ligand has been found to take the $=delta$ conformation in the S,S-chxn and S-pn platinum (II) complexes, while it takes the $\lambda$ conformation in the R,R-chxn and R-pn platinum (II) complexes.

• 대한수학회논문집
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• 제9권2호
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• pp.279-284
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• 1994

Let R = ($r_1$, $r_2$, …, $r_{m}$) and S = ($s_1$, $s_2$, …, $s_{n}$ ) be positive integral vectors satisfying $r_1$＋ $r_2$＋…＋ $r_{m}$ = $s_1$＋ $s_2$＋ㆍㆍㆍ＋ $s_{n}$ , and let U(R, S) denote the class of all m $\times$ n matrices A = [$_a{ij}$ ] where $a_{ij}$ = 0 or 1 such that (equation omitted) = $r_{i}$ , (equation omitted) = $s_{j}$ , i = 1, ㆍㆍㆍ, m, j = 1, ㆍㆍㆍ, n.(omitted)

• 대한화학회지
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• 제41권3호
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• pp.150-156
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• 1997

Bulgecinine의 선구물질인 (4S,5R)-1-acetyl-2-formyl-5-benzyloxymethyl-4-pyrrolidinol (15)을 diacetone-D-glucose로부터 합성하였다. Barton 탈산소화 반응, C-5에서의 반전, $-N_3$ 도입과 환원 및 C-2에서의 고리 형성을 통해 bulgecinine의 핵심 중간체인 두 고리 화합물 (6R)-6-Ο-benzyloxymethyl-(3R)-3-methoxy-2-oxa-5-azabicyclo-[2,2,1]heptane (13)을 합성하였다. 화합물 13을 N-아세틸화 후 산가수분해하여 얻은 bulgecinine 선구물질은 토토머화가 수반되어 (2S,4S,5R)-pyrrolidinol 유도체 15와 함께 (2S,4S,5R)-부분 입체 이성질체도 얻어졌다.

• Bulletin of the Korean Chemical Society
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• 제6권2호
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• pp.119-120
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• 1985

Stereospecific coordination of racemic 2,3-diaminobutane has been observed in the reaction with platinum(Ⅱ) complexes of optically active 6,6'-dimethyl-2,2'-diaminobiphenyl. The reaction between [Pt (R-dmdabp) Cl$_{2}$] (R-dmdabp is R-6,6'-dimethyl-2,2'-diaminobiphenyl) and unresolved bn (bn is 2,3-diaminobutane) has yielded [Pt(R-dmdabp)-(R-bn)] Cl$_{2}$ only, while the reaction of [Pt(S-dmdabp)Cl$_{2}$] with unresolvd bn has yielded [Pt(S-dmdabp) (S-bn)]Cl$_{2}$ only. On the other hand, the standard [Pt(R-dmdabp) (R-bn)] Cl$_{2}$ complex has been independently prepared from the reaction of [Pt(R-dmdabp)Cl$_{2}$] with R-bn, and the standard [Pt(S-dmdabp) (S-bn)] Cl$_{2}$ from the reaction of [Pt(S-dmdabp)Cl$_{2}$] with S-bn. The stereospecific behavior of the racemic 2,3-diamino-butane is thus confirmed from the comparison of these Pt(Ⅱ) complexes prepared using racemic bn with the standard Pt(Ⅱ) complexes prepared using R-bn or S-bn.

• 대한수학회보
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• 제22권2호
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• pp.121-126
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• 1985

D.K. Harrison [5] has shown that if R and S are fields of characteristic different from 2, then two Witt rings W(R) and W(S) are isomorphic if and only if W(R)/I(R)$^{3}$ and W(S)/I(S)$^{3}$ are isomorphic where I(R) and I(S) denote the fundamental ideals of W(R) and W(S) respectively. In [1], J.K. Arason and A. Pfister proved a corresponding result when the characteristics of R and S are 2, and, in [9], K.I. Mandelberg proved the result when R and S are commutative semi-local rings having 2 a unit. In this paper, we prove the result when R and S are 2-fold full rings. Throughout this paper, unless otherwise specified, we assume that R is a commutative ring having 2 a unit. A quadratic space (V, B, .phi.) over R is a finitely generated projective R-module V with a symmetric bilinear mapping B: V*V.rarw.R which is nondegenerate (i.e., the natural mapping V.rarw.Ho $m_{R}$ (V, R) induced by B is an isomorphism), and with a quadratic mapping .phi.:V.rarw.R such that B(x,y)=(.phi.(x+y)-.phi.(x)-.phi.(y))/2 and .phi.(rx)= $r^{2}$.phi.(x) for all x, y in V and r in R. We denote the group of multiplicative units of R by U(R). If (V, B, .phi.) is a free rank n quadratic space over R with an orthogonal basis { $x_{1}$, .., $x_{n}$}, we will write < $a_{1}$,.., $a_{n}$> for (V, B, .phi.) where the $a_{i}$=.phi.( $x_{i}$) are in U(R), and denote the space by the table [ $a_{ij}$ ] where $a_{ij}$ =B( $x_{i}$, $x_{j}$). In the case n=2 and B( $x_{1}$, $x_{2}$)=1/2, we reserve the notation [ $a_{11}$, $a_{22}$] for the space.the space.e.e.e.

• Kyungpook Mathematical Journal
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• 제54권4호
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• pp.607-617
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• 2014

Let S = C(r,m), the finite cyclic semigroup with index r and period m. Each subsemigroup of S is cyclic if and only if either r = 1; r = 2; or r = 3 with m odd. For $r{\neq}1$, the maximum value of the minimum number of elements in a (minimal) generating set of a subsemigroup of S is 1 if r = 3 and m is odd; 2 if r = 3 and m is even; (r-1)/2 if r is odd and unequal to 3; and r/2 if r is even. The number of cyclic subsemigroups of S is $r-1+{\tau}(m)$. Formulas are also given for the number of 2-generated subsemigroups of S and the total number of subsemigroups of S. The minimal generating sets of subsemigroups of S are characterized, and the problem of counting them is analyzed.

• 대한수학회보
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• 제40권1호
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• pp.29-51
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• 2003

In this paper we construct a natural filtration associated to the plethysm $S_{r}(\wedge^2 \varphi)$ over arbitrary commutative ring R. Let $\phi$ : G longrightarrow F be a morphism of finite free R-modules. We construct the natural filtration of $S_{r}(\wedge^2 \varphi)$ as a $GL(F){\times}GL(G)$- complex such that its associated graded complex is ${\Sigma}_{{\lambda}{\in}{\Omega}_{\gamma}}=L_{2{\lambda}{\varphi}$, where ${{\Omega}_{\gamma}}^{-}$ is a set of partitions such that $│\wedge│\;=;{\gamma}\;and\;2{\wedge}$ is a partition of which i-th term is $2{\wedge}_{i}$. Specializing our result, we obtain the filtrations of $S_{r}(\wedge^2 F)\;and\;D_{r}(D_2G).

• 한국동물학회지
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• 제7권2호
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• pp.13-18
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• 1964

저자(著者)들은 경기도(京畿道) 광릉(光陵)에서 채집(採集)한 야생(野生)인 초파리 13종(種)을 aceto-lactic orcein squash 방법(方法)으로 염색체수(染色體數)와 형태(形態)를 관찰(觀察)하여 다음과 같은 결과(結果)를 얻었다. 염색체(染色體)의 형태(形態)는 centromere의 위치(位置)를 기준(基準)으로 하여 V 형(型)(median or submedian), R 형(型)(terminal), D 형(型)(do-like)의 3종류로 분류(分類)했다. 염색체수(染色體數)는 diploid로, 핵형표시(核型表示)는 haploid로 나타냈다. 1) Leucophengo maculata의 염색체수(染色體數)는 12이고 핵형(核型)은 5V's+1D's이고 X염색체(染色體)는 V 형(型), Y도 같은 모양을 한다. 2) Scaplomyza pallida의 염색체수(染色體數)는 8이며 핵형(核型)은 2V's+1R's+1D's이고 X염색체(染色體)는 R 형(型), Y도 R형(型)이다. 3) Mycodrosophila poecilogastra의 염색체수(染色體數)는 12이며 핵형(核型)은 5R's+1D's이고 X염색체(染色體)는 R형(型), Y도 R(型)이다. 4) Mycodrosophila sp.의 염색체수(染色體數)는 8이며 핵형(核型)은 2V's+1R's+1D's이고 X염색체(染色體)는 V형(型), Y도 V형(型)이다. 5) Drosophila coracina의 염색체수(染色體數)는 8이며 핵형(核型)은 2V's+1R's+1D's이고 X염색체(染色體)는 R형(型), Y염색체(染色體)도 같은 모양을 한다. 6) Drosophila histrioides의 염색체수(染色體數)는 10이며 핵형(核型)은 1V's+3R's+1D's이고 성염색체(性染色體)는 밝히지 못하였다. 7) Drosophila malanogaster의 염색체수(染色體數)는 8이고 핵형(核型)은 2V's+1R's+1D's이고 X염색체(染色體)는 R형(型), Y는 J형(型)이다. 8) Drosophila auraria의 염색체수(染色體數)는 8이며 핵형(核型)은 2V's+1R's+1D's이고 X염색체(染色體)는 R형(型), Y도 R형(型)이다. 저자(著者)들은 경기도(京畿道) 광릉(光陵)에서 채집(採集)한 야생(野生)인 초파리 13종(種)을 aceto-lactic orcein squash 방법(方法)으로 염색체수(染色體數)와 형태(形態)를 관찰(觀察)하여 다음과 같은 결과(結果)를 얻었다. 염색체(染色體)의 형태(形態)는 centromere의 위치(位置)를 기준(基準)으로 하여 V 형(型)(median or submedian), R 형(型)(terminal), D 형(型)(do-like)의 3종류로 분류(分類)했다. 염색체수(染色體數)는 diploid로, 核型表示(핵형표시)는 haploid로 나타 냈다. 1) Leucophengo maculata의 염색체수(染色體數)는 12이고 핵형(核型)은 5V's+1D's이고 X염색체(染色體)는 V 형(型), Y도 같은 모양을 한다. 2) Scaplomyza pallida의 염색체수(染色體數)는 8이며 핵형(核型)은 2V's+1R's+1D's이고 X염색체(染色體)는 R 형(型), Y도 R형(型)이다. 3) Mycodrosophila poecilogastra의 염색체수(染色體數)는 12이며 핵형(核型)은 5R's+1D's이고 X염색체(染色體)는 R형(型), Y도 R(型)이다. 4) Mycodrosophila sp.의 염색체수(染色體數)는 8이며 핵형(核型)은 2V's+1R's+1D's이고 X염색체(染色體)는 V형(型), Y도 V형(型)이다. 5) Drosophila coracina의 염색체수(染色體數)는 8이며 핵형(核型)은 2V's+1R's+1D's이고 X염색체(染色體)는 R형(型), Y염색체(染色體)도 같은 모양을 한다. 6) Drosophila histrioides의 염색체수(染色體數)는 10이며 핵형(核型)은 1V's+3R's+1D's이고 성염색체(性染色體)는 밝히지 못하였다. 7) Drosophila malanogaster의 염색체수(染色體數)는 8이고 핵형(核型)은 2V's+1R's+1D's이고 X염색체(染色體)는 R형(型), Y는 J형(型)이다. 8) Drosophila auraria의 염색체수(染色體數)는 8이며 핵형(核型)은 2V's+1R's+1D's이고 X염색체(染色體)는 R형(型), Y도 R형(型)이다. 9) Drosophila unispina의 염색체수(染色體數)는 12이며 핵형(核型)은 5R's+1D's이고 X염색체(染色體)는 R형(型), Y도 R형(型)이다. 10) Drosophila bizonata의 염색체수(染色體數)는 8이며 핵형(核型)은 3V's+1D's이고 X염색체(染色體)는 V형(型), Y는 보다 크기가 작은 V형(型)이다. 11) Drosophila virilis의 염색체수(染色體數)는 12이며 핵형(核型)은 5R's+1D's이고 X염색체(染色體)는 R형(型), Y도 R형(型)이다. 12) Drosophila sordidula의 염색체수(染色體數)는 10이고 핵형(核型)은 2V's+2R's+1D's이고 X염색체(染色體)는 V형(型), Y도 V형(型)이다. 13) Drosophila tenuicanda의 염색체수(染色體數)는 12이며 핵형(核型)은 1V's+4R's+1D's이고 성염색체(性染色體)는 밝히지 못하였다.

• Journal of Ginseng Research
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• 제27권3호
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• pp.129-134
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• 2003

When ginsenoside $R_{*}$b1/ and $R_{b2}$ were anaerobically incubated with human fecal microflora, these ginsenosides were metabolized to compound K (IH-901). When ginsenoside $R_{g3}$ was anaerobically incubated with human fecal microflora, the ginsenoside $R_{g3}$ was metabolized it to ginsenoside $R_{h2}$. Among ginsenosides, IH-901 and 20(S)-ginsenoside $R_{h2}$ exhibited the most potent cyotoxicity against tumor cells: 50% cytotoxic concentrations of IH-901 in the media with and without fetal bovine serum (FBS) were 27.1-31.6 $\mu$M and 0.1-0.61 $\mu$M, and those of 20(S)-ginsenoside $R_{h2}$ were 37.5->50 and 0.7-7.1 $\mu$M, respectively. The cytotoxic potency of ginsenosides was IH-901>20(S)-ginsenoside R $h_{h2}$》20(S)-ginsenoside $R_{g3}$>ginsenoside $R_{b1}$(equation omitted) $R_{b2}$.EX>$R_{b2}$./.