Utilization and transformation of derived dissolved organic matter by phycosphere bacteria and .

The dissolved organic matter (DOM) released from the cocoolithophores () was studied in laboratory experiments after co-culturing with bacteria. (CA6)--Proteobacteria and (CF2) were used to investigate the utilization and processing of the DOM derived from , utilizing fluorescence excitation-emission matrix (EEM) combined with parallel factor analysis (EEM-PARAFAC), while measuring algal abundance and photosynthetic parameters. The experimental groups consisted of axenic groups, filter cultured with bacteria (CA6 or CF2) groups, co-cultured with bacteria (CA6 or CF2) groups and axenic bacteria (CA6 or CF2) groups.

Integrated FT-ICR MS and metabolome reveals diatom-derived organic matter by bacterial transformation under warming and acidification.

Bacterial transformation and processing of diatom-derived organic matter (OM) is extremely important for the cycling of production and energy in marine ecosystems; this process contributes to the production of microbial food webs. In this study, a cultivable bacterium ( sp. SD-R1) from the marine diatom were isolated and identified.

A snapshot on vertical variability of dissolved organic matter in the epilagic zone of the eastern Indian Ocean.

Marine dissolved organic matter (DOM) plays an important role in aquatic ecosystems and is an essential reservoir of organic carbon in the marine carbon cycle. In this study, seawater DOM samples from 33 stations were collected in spring 2022 (April to May, 20 stations) and autumn 2020 (October to November, 13 stations) to better characterize and compare DOM variability within 200 m water layer in the eastern Indian Ocean (EIO). Hydrological parameters, nutrients and spectroscopic indices were calculated and evaluated for two cruises.

Variations in dissolved organic matter chemistry on a vertical scale in the eastern Indian Ocean.

Oceans cover approximately 71% of the Earth's surface area, which is why some people refer to the Earth as a large water sphere. Marine dissolved organic matter (DOM) constitutes the main carbon pool for biogeochemical cycles and plays an important role in global carbon dynamics. Here, the molecular composition and component characteristics of surface (5 m), deep chlorophyll maximum (DCM), and deep (2000 m) layer DOM in the eastern Indian Ocean (EIO) were investigated using Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) and three-dimensional fluorescence spectroscopy.