Adaptive traits of clade ammonia-oxidizing archaea.

Unlabelled: Nitrification is a core process in the global nitrogen (N) cycle mediated by ammonia-oxidizing microorganisms, including ammonia-oxidizing archaea (AOA) as a key player. Although much is known about AOA abundance and diversity across environments, the genetic drivers of the ecophysiological adaptations of the AOA are often less clearly defined. This is especially true for AOA within the genus , which have several unique physiological traits (e.

Three New Cytotoxic Steroidal Glycosides Isolated from Conus pulicarius Collected in Kosrae, Micronesia.

Three new sulfated steroidal glycosides (-), along with known cholesterol derivatives (,), were isolated from the visceral extract of the cone snail . The structure of each new compound was elucidated by nuclear magnetic resonance spectroscopy and high-resolution mass spectrometry. The three new compounds exhibited significant in vitro cytotoxicity (GI values down to 0.

Cytotoxic psammaplysin analogues from a Suberea sp. marine sponge and the role of the spirooxepinisoxazoline in their activity.

Seventeen bromotyrosine-derived metabolites, including eight new compounds, were isolated from a Micronesian sponge of the genus Suberea. Four of the new compounds were psammaplysin derivatives (10-13), and the other four were ceratinamine derivatives (14-17). Of the compounds obtained, the psammaplysins exhibited cytotoxicity against human cancer cell lines (GI₅₀ values down to 0.

Simultaneous determination of polymethoxyflavones in Citrus species, Kiyomi tangor and Satsuma mandarin, by high performance liquid chromatography.

The content of polymethoxyflavones (PMFs) in Kiyomi tangor (Citrus unshiu Marcov. forma miyagawa-wase×C. sinensis) and Satsuma mandarin (C.

Isolation and identification of polymethoxyflavones from the hybrid Citrus, hallabong.

Seven polymethoxyflavones (PMFs) were isolated from the dried peels of hallabong, the hybrid Citrus , by a repeated column chromatography. The structures of PMFs were identified as 5,6,7,3',4'-pentamethoxyflavone (1), 6,7,8,3',4'-pentamethoxyflavone (2), 3-hydroxy-5,6,7,4'-tetramethoxyflavone (3), 5,6,7,8,3',4'-hexamethoxyflavone (4), 3,6,7,4'-tetramethoxyflavone (5), 3,5,6,7,8,3',4'-heptamethoxyflavone (6), and 5,6,7,8,4'-pentamethoxyflavone (7) using 1H and 13C NMR in combination with mass spectrometry. Among these compounds, 5 was isolated for the first time from nature.