• Bulletin of the Korean Chemical Society
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• 제17권11호
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• pp.1009-1018
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• 1996

A study on the application of vinyl radical cyclization via free radical allylation reaction in the synthesis of various carbocyclic compounds is described. In connection with this study, a new allyl transfer reagent, 2-bromo-3-(phenylthio)propene 1 is developed and it was shown that vinyl radical cyclization through free radical allylation reaction using reagent 1 provides a valuable approach to carbocyclic systems with a reactive exo-alkylidene moiety, which is advantageous for further transformations.

• Kyungpook Mathematical Journal
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• 제27권2호
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• pp.191-195
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• 1987

In this note we introduce the concept of a lower radical for ${\Gamma}$-rings. As an application we also characterise the prime radical introduced by Barnes [1] as a lower radical. Furthermore it is shown that the prime radical can also be determined by the class of all semiprime ${\Gamma}$-rings.

• Korean Journal of Mathematics
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• 제18권1호
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• pp.97-103
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• 2010

It is well known that the group ring K[G] has the nontrivial Jacobson radical if K is a field of characteristic p and G is a finite group of which order is divided by a prime p. This paper is concerned with the structure of the Jacobson radical of such a group ring.

• 대한수학회보
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• 제45권4호
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• pp.757-762
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• 2008

In this paper, we generalize a few results of [7, 10] for lower radical classes of rings, by using the limit ordinal construction for lower radical classes of hemirings.

• 충청수학회지
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• 제12권1호
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• pp.187-191
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• 1999

In this paper we will show that if [G(y), x]D(x) lies in the nil radical of A for all $x{\in}A$, then GD maps A into the radical, where D and G are derivations on a Banach algebra A.

• 대한수학회논문집
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• 제14권2호
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• pp.365-371
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• 1999

In this paper, we prove that the range of homomorphism from a C\ulcorner-algebra A into a commutative Banach algebra B whose radical is nil contains no non-zero element of the radical of B. Using this result we show that there is no non-zero homomorphism from a C\ulcorner-algebra into a commutative radical nil Banach algebra.

• 대한수학회보
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• 제37권2호
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• pp.265-272
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• 2000

Let D be a derivation on an Banach algebra A. Suppose that [[D(x), x], D(x)] lies in the nil radical of A for all $x{\;}{\in}{\;}A$. Then D(A) is contained in the Jacobson radical of A.

• Archives of Pharmacal Research
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• 제6권1호
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• pp.1-6
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• 1983

The reaction of ethylenecarbonate (I) with bromine was carried out in the presence of benzolperoxide as radical initiator. The following several different esters being ring opened were obtained; bromoacetyl-bromoformate, (1-hyroxy, 1, 2-dibromo)-ethyl bromoformate, (1-hydroxy, 1, 2, 2'-tribromo)diethylacarbonate, 2-bromoethyl-tribromoacetate, (1-acetoxy, 1'-bromomethyl)-bromomalo nate, 2-bromoethyl-bromoacetoxy-tribromoacetate.

• 한국응용과학기술학회지
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• 제31권4호
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• pp.719-730
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• 2014

노루궁뎅이 버섯균사체(Hericium erinaceum)를 인진쑥(Artemisia capillaris)에 배양하여 조제한 AC-HE 열수 추출물이 생체고분자의 산화적 손상과 세포사멸을 보호할 수 있는 지를 관찰하였다. AC-HE의 항산화 활성을 DPPH radical, ABTS radical, peroxyl radical 소거활성 측정을 통해 알아보았다. 그 결과 DPPH radical 소거활성은 $500{\mu}g/mL$ 농도에서 61.73%, ABTS radical 소거활성은 $250{\mu}g/mL$ 농도에서 97.39%, peroxyl radical 소거활성은 $100{\mu}g/mL$ 농도에서 44.18%로 나타났다. AC-HE은 DNA의 산화적 손상을 효과적으로 억제하였다. 또한 생체고분자물질인 사람의 혈청단백질의 산화적 손상을 억제하였다. 세포에 $H_2O_2$를 처리하였을 때 세포생존율에 비하여 발효물을 $100{\mu}g/mL$ 농도로 전 처리한 세포생존율은 11.47% 증가했으며, 발효물을 $50{\mu}g/mL$ 농도로 처리했을 경우 세포내 ROS의 축적이 유의적으로 감소되었다. 따라서 AC-HE은 항산화 활성뿐만 아니라 산화적 스트레스에 의해 야기되는 세포 독성에 대한 보호 작용이 뛰어난 것으로 사료되었다.

• Ocean and Polar Research
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• 제34권4호
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• pp.445-451
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• 2012

The EtOH extracts of red seaweeds (Symphyocladia latiuscula, Chondrus ocellatus and Carpopeltis affinis) and solvent partitioned fractions were investigated for their 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) and 1,1-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging effects and the total phenolic contents were correlated with ABTS and DPPH radical scavenging activities. The EtOH extracts and their solvent partitioned fractions exhibited strong ABTS and DPPH radical scavenging activities. Among the solvent partitioned fractions obtained from n-Hexane (HX), methylenchloride (MC), ethylacetate (EA), and buthanol (BuOH), the HX fraction from C. affinis showed higher radical scavenging activities than other fractions. Total phenolic contents showed significant correlation ($r^2$ = 0.709) with ABTS radical scavenging activity. The results of this study suggest that the strong radical scavenging activity of HX fraction from C. affinis is a promising natural antioxidant for healthcare products.