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Youngju Kim Hiromu Ogura Kazuaki Akasaka Tsutomu Oikawa Nobuyasu Matsuura Chiaki Imada Hisato Yasuda Yasuhiro Igarashi 《Marine drugs》2014,12(7):4110-4125
One new α-pyrone (nocapyrone R (1)), and three known γ-pyrones (nocapyrones B, H and L (2–4)) were isolated from the culture extract of a Nocardiopsis strain collected from marine sediment. Structures of these compounds were determined on the basis of spectroscopic data including NMR and MS. γ-Pyrones 2–4 were found to induce adiponectin production in murine ST-13 preadipocyte cells but the α-pyrone 1 had no activity. The absolute configuration of the anteiso-methyl branching in 4 was determined by HPLC comparison of a degraded product of 4 with standard samples as a 2:3 enantiomeric mixture of (R)- and (S)-isomers. 相似文献
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We have modeled the prey–predator dynamics between nutrients, phytoplankton, and copepods in Hiuchi-nada, central part of
the Seto Inland Sea. The model parameters were estimated by stepwise regression using data sampled from 2001 to 2005. We re-created
the fluctuations in copepod biomass in the spring–summer of 2001–2004 by model simulation and investigated the relationship
between the re-created copepod biomass and anchovy Engraulis japonicus reproductive success rate in Hiuchi-nada. The anchovy reproductive success rate was proportional to the copepod biomass during
the last 10 days of May, a period that immediately preceded anchovy recruitment. This relationship indicates that a possible
key factor in the regulation of anchovy population levels is the fluctuation in abundance of the copepod assemblage and that
the crucial period for anchovy recruitment in Hiuchi-nada would be the period just before anchovy recruitment to the shirasu
(body length: approx. 20–35 mm) fishery. These results provide a potential framework for forecasting the anchovy recruitment
level that is based on both larval abundance and survival rate as estimated from the biomass of copepods in the pre-recruitment
period of anchovy. 相似文献
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