• Proceedings of the Korean Ceranic Society Conference
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• 2002.10a
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• pp.66.2-66
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• 2002

• Bulletin of the Korean Chemical Society
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• v.31 no.4
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• pp.1085-1087
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• 2010

• Bulletin of the Korean Chemical Society
• /
• v.33 no.4
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• pp.1379-1382
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• 2012

• Bulletin of the Korean Chemical Society
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• v.25 no.11
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• pp.1720-1722
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• 2004

• Bulletin of the Korean Chemical Society
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• v.25 no.11
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• pp.1726-1728
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• 2004

• Archives of Pharmacal Research
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• v.18 no.3
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• pp.217-218
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• 1995

• Bulletin of the Korean Chemical Society
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• v.14 no.6
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• pp.757-759
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• 1993

• Bulletin of the Korean Chemical Society
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• v.8 no.4
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• pp.296-298
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• 1987

Irradiation of a solution of chloranil and cycloheptatriene, or 1,3-cyclohexadiene, in dichloromethane yielded unexpected photorearrangement products as the major product, while chloranil with cyclohexene gave the photorearrangement product as well as 1 : 1 adduct.

• Journal of the Korean Chemical Society
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• v.33 no.2
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• pp.238-246
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• 1989

1,3-Oxathiolane sulfoxide 4 in which the sulfoxide oxygen and the 2-methyl group are on the same face of the oxathiolane ring undergoes a sigmatropic rearrangement to produce a ring expansion product. The structure of this product would be dihydro-1,4-oxathiin 6 or isomeric exo compound 7. This paper describes physical and chemical methods to determine the correct structure of the two alternatives. Thus, $^1HNMR$, UV spectroscopies, and mass spectrometry showed that the product actually obtained had the structure 6. It was also found that from deuteration reactions of the product the compound 7 was initaly formed and then tautomerized to endo compound 6.

• IMMUNE NETWORK
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• v.2 no.2
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• pp.79-85
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• 2002

Background: In contrast to evidences of Ig H chain receptor editing in transformed cell lines and transgenic mouse models, there has been no direct evidence that this phenomenon occurs in human developing B cells. Methods: $V_HDJ_H$ rearrangements were obtained from genomic DNA of individual $IgM^-$ B cells from liver and $IgM^+B$ cells from bone marrow of 18 wk of gestation human fetus by PCR amplification and direct sequencing. Results: We found three examples of H chain receptor editing from $IgM^+$ and $IgM^-human$ fetal B cells. Two types of $V_H$ replacements were identified. The first involved $V_H$ hybrid formation, in which part of a $V_H$ gene from the initial VDJ rearrangement is replaced by part of an upstream $V_H$ gene at the site of cryptic RSS. The second involved a gene conversion like replacement of CDR2, in which another $V_H$ gene donated a portion of its CDR2 sequence to the initial VDJ rearrangement. Conclusion: These data provide evidence of receptor editing at the H chain loci in developing human B cells, and also the first evidence of a gene conversion event in human Ig genes.