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Zoology and wildlife conservation

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Synthesis of nuclei of the superheavy element 114 in reactions induced by (super48)Ca

Article Abstract:

It has been shown that neutron-rich nuclei with N > 168 can be synthesized in fusion reactions using heavy isotopes of uranium, plutonium and curium and a (super48)Ca ion beam. The synthesis of an isotope having 114 protons and 173 neutrons has been undertaken, via fusion of intense beams of (super48)Ca ions with (super242)Pu targets. The new isotope (super287)114 has a half life several times shorter than the heavier isotope (super289)114.

Author: Hofmann, S., Morita, K., Chepigin, V.I., Itkis, M.G., Malyshev, O.N., Oganessian, Yu. Ts., Yremin, A.V., Popeko, A.G., Bogomolov, S.L., Buklanov, G.V., Chelnokov, M.L., Gikal, B.N., Gorshkov,V.A., Gulbekian, G.G., Kabachenko, A.P., Lavrentev,A. Yu., Rohac, J., Sagaidak, R.N., Saro,S., Giardina, G.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
Isotopes, Nuclides

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A new pathway for polyketide synthesis in microorganisms

Article Abstract:

A homodimer of Rppa is found to catalyze polyketide synthesis, by selecting malonyl-coenzyme-A and undertaking four successive extensions, releasing pentaketide to cyclize to 1,3,6,8-tetrahydroxynaphthalene (THN). A cysteine residue was found to be necessary for enzyme activity. THN formed by RppA seems to be an intermediate in biosynthetic pathways for melanins and other secondary metabolites containing a naphthoquinone ring.

Author: Fujii, Isao, Ebizuka, Yutaka, Horinouchi, Sueharu, Ohnishi, Yasuo, Funa, Nobutaka, Shibuya, Masaaki
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
Biosynthesis, Plant metabolites

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Subjects list: Research
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