To elucidate the effect of macroalgae blooms on dissimilatory nitrate reduction pathways (denitrification, anammox, and DNRA) in sediments hypereutrophic Yatsu tidal flat, eastern Japan, sediment denitrification, DNRA rates were measured using a 15N tracer technique at two sites affected unaffected by (Ulva) incubation experiments with without Ulva. Anammox was insignificant both experiments. T...

Sulfated polysaccharides were extracted from Ulva pertusa and fractionated to obtain the most immunostimulating fraction (F(2)). The glycosidic linkages of the polysaccharides in the fraction F(2) were determined using GC-MS and 2D-NMR spectroscopy after chemical modifications, including reduction and desulfation under various conditions. Methanol was used as a sulfate acceptor for the removal ...

Wailupemycins H (1) and I (2) with a new skeleton coupled two 6-(2-phenylnaphthalene-1-yl)pyrane-2-one nuclei to a -CH2- linkage were identified from the culture of Streptomyces sp. OUCMDZ-3434 associated with the marine algae, Enteromorpha prolifera. Compounds 1 and 2 are two new α-glucosidase inhibitors with the Ki/IC50 values of 16.8/19.7 and 6.0/8.3 μM, respectively. In addition, the absolu...

Throughout the ages, macroalgae have provided humankind with elements beneficial to human health, and often bioactive abilities. Yet, while today we fully acknowledge such potential, especially that of most widely known species, an even greater number species remain unaknowledged. This holds particularly true for highly diverse phylum Rhodophyta (red seaweeds) and, therefore, present study aims...