• 한국연초학회지
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• 제4권2호
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• pp.23-30
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• 1982

Six flue- cured cultivars of Nicotiana tabacum L., 15 possible $F_1$ hybrids and $F_2$ Populations among them, and 15 haploid Populations from Fl hybrids and haploids from Parents, were evaluated. Comparisons of the $F_1$, hybrids and $F_2$ Populations with the Parents indicated that heterosis values were small but significant for yield, plant height, days to flower, leaf length and width and total alkaloids from-6.0% to 5.4% in $F_1$ hybrids, and from -3.4% to 3.6% for Plant height days to flower leaves per plant in $F_2$ populations, respectively. There were positive correlations for yield, plant height, days to flower, leaves per plant and total alkaloids between diploid and haploid populations. Increase or decrease ratio of haploids to diploids of total alkaloids was appeared to 30.3%. Those for yield, leaf length and width, value arid reducing sugar were ranged from -4.1% to -27.6%.

• 대한한방부인과학회지
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• 제22권2호
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• pp.43-59
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• 2009

Purpose: This study was performed to determine the inhibitory effect of Persimmon Leaves extract (PL) on melanin synthesis in B16F10 melanoma cells B16F10. Methods: The inhibitory effects of PL on melanin synthesis were determined by in vitro assay. To elucidate inhibitory effects of PL on melanin synthesis, we determined the melanin release and melanin production in B16F10. And to investigate the action mechanism, we assessed the gene expression of tyrosinase, TRP-1, TRP-2, PKA, PKC${\beta}$, ERK-1, ERK-2, AKT-1, MITF in B16F10. Results: 1. PL inhibited melanin release, melanin production in B16F10. 2. PL inhibited tyrosinase activity in vitro and in B16F10. 3. PL suppressed the expression of tyrosinase, TRP-1, TRP-2 in B16F10. 4. PL suppressed the expression of PKA, PKC${\beta}$ in B16F10. 5. PL increased the expression of ERK-1, ERK-2, AKT-1 in B16F10. 6. PL suppressed the expression of MITF in B16F10. Conclusion: From these results, it may be concluded that PL is possesed of the antimelanogenetic effects.

• 한국작물학회지
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• 제14권
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• pp.123-131
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• 1973

(1) 과거시험에서 권장되고 있는 복교잡종을 수량적으로 능가하였거나 대등한 결과를 나타낸 $F_1$ 품종간교잡의 $F_2$ 및 $F_3$의 생산성을 평가검정할 목적으로 11개의 황색종 품종간교잡과 5개의 백색종 품종간교잡종 및 이들의 $F_2$와 $F_3$와 더불어 각 양친품종 및 표준복교잡종 등을 1963년 우기와 1963-1964 년 건기에 걸쳐 생산력검정을 하였다. 다만 전자시험은 몹시 강한 태풍의 피해 때문에 유효한 성적을 얻지 못하였다. (2) 품종간 교잡종의 $F_1$에서 Heterosis는 아주 현저하여 양친의 평균치에 비하여 39.9%의 증수를 나타내었고 $F_2$의 수량감소는 평균 30.3%였으며 $F_3$는 평균 27.2%이었다. (3) $F_2$와 $F_3$ 세대에서는 상당한 정도의 감수가 나타나서 평균하면 $F_2$는 17.6% 그리고 $F_3$는 20.7%의 감수를 보여주었다. 이 두 세대에서의 Heterosis강세는 2수준으로 표현되었는데 4개의 조합에서는 10.9%, 그리고 나머지 12개조합에서는 22.0%이었다. 1개황색종조합 Cuban Yellow Flint${\times}$Hawaiian Flinty Dent와 3개백색종조합 Bicol White Flint${\times}$Eto Blanco, College White Flint${\times}$Eto Blanco 및 Bicol WHite Flint${\times}$Narino 33b 등은 각각 표준복교잡종인 Philippine Hybrid No. 1 및 Philippine Hybrid No. 4와 비슷한 수량성을 나타내었다. (4) Hardy-Weinberg 법칙이 명시하는바와 같이 Panmixis의 경우 유적적평형(Genetic equilibrium)이 $F_2$에서 이루어지는 것은 명확한 것으로서 $F_2$와 $F_3$의 수량사이에는 어떠한 유의성도 발견되지 않았다. (5) 이전시험에서와 같이 Hawaiian Flinty Dent는 현 장려복교잡종인 Philippine Hybrid No.1과 거의 동일한 수량을 보여 주었으므로 장차 육종사업에 좋은 자료가 될 것으로 믿는 바이다.

• Kyungpook Mathematical Journal
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• 제48권3호
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• pp.359-366
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• 2008

Let A(p) be the class of functions $f\;:\;z^p\;+\;\sum\limits_{j=1}^{\infty}a_jz^{p+j}$ analytic in the open unit disc E. Let, for any integer n > -p, $f_{n+p-1}(z)\;=\;z^p+\sum\limits_{j=1}^{\infty}(p+j)^{n+p-1}z^{p+j}$. We define $f_{n+p-1}^{(-1)}(z)$ by using convolution * as $f_{n+p-1}\;*\;f_{n+p-1}^{-1}=\frac{z^p}{(1-z)^{n+p}$. A function p, analytic in E with p(0) = 1, is in the class $P_k(\rho)$ if ${\int}_0^{2\pi}\|\frac{Re\;p(z)-\rho}{p-\rho}\|\;d\theta\;\leq\;k{\pi}$, where $z=re^{i\theta}$, $k\;\geq\;2$ and $0\;{\leq}\;\rho\;{\leq}\;p$. We use the class $P_k(\rho)$ to introduce a new class of multivalent analytic functions and define an integral operator $L_{n+p-1}(f)\;\;=\;f_{n+p-1}^{-1}\;*\;f$ for f(z) belonging to this class. We derive some interesting properties of this generalized integral operator which include inclusion results and radius problems.

• Biomolecules & Therapeutics
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• 제10권4호
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• pp.293-302
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• 2002

The classical concept for iron uptake into mammalian cells has been the endocytosis of transferrin( $T_{f}$ )-bound F $e^{3+}$ via the $T_{f}$ - $T_{f}$ receptor cycle. In this case, we could not explain the uptake of F $e^{2＋}$ ion and the export of iron from endosome. Studies on iron transport revealed that other transport system exists in epithelial cells of the intestine. One of non- $T_{f}$ -receptor-mediated transport systems is Nramp2/DMT1/DCT1 which transports M $n^{＋＋}$, $Mg^{＋＋}$, Z $n^{＋＋}$, $Co^{＋＋}$, N $i^{＋＋}$ or C $u^{＋＋}$ ion as well as F $e^{+2}$ ion. DMT1 was cloned from intestines of iron-deficient rats and shown to be a hydrogen ion-coupled iron transporter and a protein regulated by absorbed dietary iron. DMT1 is founded in other cells such as cortical and hippocampal glial cells as well as endothelial cells in duodenum. Two F $e^{3+}$ ion bound to transferrin( $T_{f}$ ) are taken up via the $T_{f}$ - $T_{f}$ receptor cycle in the intestinal epithelial cell. F $e^{3+}$ in endosome was converted to F $e^{2＋}$ ion, and then exported to cytosol via DMT1. F $e^{2＋}$ ion is taken up into cytosol via DMT1. Several other transporters such as FET, FRE, CCC2, AFT1, SMF, FTR, ZER, ZIP, ZnT and CTR have been reported recently and dysfunction of the transporters are related with diseases containing Wilson's disease, Menkes disease and hemochromatosis. Evidences from several studies strongly suggest that DMT1 is the major transporter of iron in the intestine and functions critically in transport of other metal ions.

• 대한수학회보
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• 제58권4호
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• pp.795-814
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• 2021

In this paper, we study the transcendental meromorphic solutions for the nonlinear differential equations: fⁿ + P(f) = R(z)e^α(z) and fⁿ + P_*(f) = p₁(z)e^α₁(z) + p₂(z)e^α₂(z) in the complex plane, where P(f) and P_*(f) are differential polynomials in f of degree n - 1 with coefficients being small functions and rational functions respectively, R is a non-vanishing small function of f, α is a nonconstant entire function, p₁, p₂ are non-vanishing rational functions, and α₁, α₂ are nonconstant polynomials. Particularly, we consider the solutions of the second equation when p₁, p₂ are nonzero constants, and deg α₁ = deg α₂ = 1. Our results are improvements and complements of Liao ([9]), and Rong-Xu ([11]), etc., which partially answer a question proposed by Li ([7]).

• 대한수학회지
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• 제47권6호
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• pp.1147-1165
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• 2010

In this paper we compare a torsion free sheaf F on $P^N$ and the free vector bundle $\oplus^n_{i=1}O_{P^N}(b_i)$ having same rank and splitting type. We show that the first one has always "less" global sections, while it has a higher second Chern class. In both cases bounds for the difference are found in terms of the maximal free subsheaves of F. As a consequence we obtain a direct, easy and more general proof of the "Horrocks' splitting criterion", also holding for torsion free sheaves, and lower bounds for the Chern classes $c_i$(F(t)) of twists of F, only depending on some numerical invariants of F. Especially, we prove for rank n torsion free sheaves on $P^N$, whose splitting type has no gap (i.e., $b_i{\geq}b_{i+1}{\geq}b_i-1$ 1 for every i = 1,$\ldots$,n-1), the following formula for the discriminant: $$\Delta(F):=2_{nc_2}-(n-1)c^2_1\geq-\frac{1}{12}n^2(n^2-1)$$. Finally in the case of rank n reflexive sheaves we obtain polynomial upper bounds for the absolute value of the higher Chern classes $c_3$(F(t)),$\ldots$,$c_n$(F(t)) for the dimension of the cohomology modules $H^iF(t)$ and for the Castelnuovo-Mumford regularity of F; these polynomial bounds only depend only on $c_1(F)$, $c_2(F)$, the splitting type of F and t.

• Korean Journal of Mathematics
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• 제27권2호
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• pp.437-444
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• 2019

For c > -1, let ${\nu}_c$ denote a weighted radial measure on ${\mathbb{C}}$ normalized so that ${\nu}_c(D)=1$. For $c_1,c_2>-1$ and $f{\in}L^1(D^2,\;{\nu}_{c_1}{\times}{\nu}_{c_2})$, we define the weighted Berezin transform $B_{c_1,c_2}f$ on $D^2$ by $$(B_{c_1,c_2})f(z,w)={\displaystyle{\smashmargin2{\int\nolimits_D}{\int\nolimits_D}}}f({\varphi}_z(x),\;{\varphi}_w(y))\;d{\nu}_{c_1}(x)d{\upsilon}_{c_2}(y)$$. This paper is about the space $M^p_{c_1,c_2}$ of function $f{\in}L^p(D^2,\;{\nu}_{c_1}{\times}{\nu}_{c_2})$ ) satisfying $B_{c_1,c_2}f=f$ for $1{\leq}p<{\infty}$. We find the identity operator on $M^p_{c_1,c_2}$ by using invariant Laplacians and we characterize some special type of functions in $M^p_{c_1,c_2}$.

• 한방안이비인후피부과학회지
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• 제20권3호
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• pp.1-13
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• 2007

Objective : This study was performed to assess the whitening effect of Bombysis Corpus on melanin synthesis. Methods : The whitening effects of Bombysis Corpus were examined by in vitro melanin production assay. We assessed inhibitory effects of Bombysis Corpus on melanin-release from B16F10, on melanin production in B16F10, on mushroom tyrosinase activity in vitro, on tyrosinase activity in B16F10, effect of Bombysis Corpus on the expression tyrosinase, TRP-1, PKA, ERK-1 ERK-2, AKT-1, MITF in B16F10. Results : 1. Bombysis Corpus inhibited melanin-release, melanin production in B16F10. 2. Bombysis Corpus inhibited tyrosinase activity in vitro and in B16F10. 3. Bombysis Corpus suppressed the expression of tyrosinase, TRP-1 in B16F10. 4. Bombysis Corpus suppressed the expression of PKA in B16F10. 5. Bombysis Corpus suppressed the expression of ERK-1, ERK-2, AKT-1 in B16F10. 6. Bombysis Corpus suppressed the expression of MITF in B16F10. Conclusion : The study shows that Bombysis Corpus inhibited melanin production on the melanogenesis.

• 한국작물학회지
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• 제35권6호
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• pp.532-538
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• 1990

본 연구는 유전 배경과 초형이 다른 추파소맥 4품종을 공시하였으며, 이들 품종들의 조합배열을 감안하여 단교배 6조합, 3원교배 6조합 및 복교배 3조합을 생산하여 각 교잡방법 및 품종교잡 배열순서에 관한 효율성을 비교 분석하여 교잡육종의 기초자료를 제공하고 신품종 육성의 효율성을 높이고자 시행하였던 바 그 결과를 요약하면, 1. 교배양식간 비교에 있어서 복교잡에서 가장 빠른 출수를 보였으며 종실수량도 20.3g으로서 가장 많았는데 3원교배 및 단교배 순으로 감소하였는데, 친품종들이 가장 적은 주당수량을 보였다. 2. 주당수량과 수량구성요소에 대한 4$\times$4 단교배 Diallel 분석은 GCA와 SCA에서 각각 조합능력의 차가 인정되었으며, 또한 SCA 효과중 평균 우성편차도 역시 모든 형질에서 차가 있었다. 주당수량의 GCA효과는 그루밀과 Bezostaya 1이 가장 높았으며, 이들 품종들이 실제 주당수량이 가장 많았다. 3. F$_1$의 SCA효과는 (은파밀/Bezostaya 1)조합에서 4.22로가장 높았고, (그루밀/은파밀) 조합에서 2.00으로 가장 낮았다. 4. 3조합의 F$_1$ 복교잡종중에서 (Lancota/은파밀//그루밀/Bezostaya 1) 조합이 주당수량 24.5g으로서 가장 많았고, 이러한 복교잡에 이용된 단교잡종(그루밀/은파밀)과 (Lancota/Bezostaya 1)의 복교잡에 직접 발현되지 않고 이들간의 염색체 교환방법에 의하여 결합되어 (그루밀/Lancota), (그루밀/Bezostaya 1), (은파밀/Lancota) 및 (은파밀/Bezostaya 1)의 조합이 발현되었으며, 이들의 단교배 F$_1$들의 평균 수량도 많고 SCA 효과도 높았다. 5. 3원교잡 F$_1$의 6조합중에서(Lan./Bez.//은파밀) 조합에서 21.3g으로 가장 높은 수량을 보였는데, 이들의 염색체의 상호 교환 결합에 의하여(Lancota/은파밀)과 (Bezostaya 1/은파밀) 조합이 SCA효과가 가장 컸고 평균 종실수량도 다른 3원교잡의 경우보다 많았다.