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Autotrophic potential in mesophilic heterotrophic bacterial isolates from Sino-Pacific marine sediments
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作者 CAO Wenrui DAS Anindita +3 位作者 SAREN Gaowa JIANG Mingyu ZHANG Hongjie YU Xinke 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2017年第2期69-77,共9页
Microbial carbon fixation is a paramount process in the ocean especially below the photic zone both in water and sedimentary ecosystems. Autotrophic microbes that fix carbon dioxide are renowned. However, the question... Microbial carbon fixation is a paramount process in the ocean especially below the photic zone both in water and sedimentary ecosystems. Autotrophic microbes that fix carbon dioxide are renowned. However, the question whether heterotrophs can also fix carbon is intriguing. Ten heterotrophically grown, identified bacterial isolates from the Sino-Pacific marine sediments were tested for autotrophic uptake potential with and without addition of electron donors. Nine of the ten isolates showed carbon uptake capacity without addition of any substrate at very low rates in the order of 10^(-8) to 10^(-4) fmol/(cell·h). The addition of manganese and ammonium at 1 mmol/L final concentration enhanced the uptake potential. Addition of 1 mmol/L final concentrations of reduced iron(10^(-6) to10^(-5) fmol/(cell·h) and sulfide(10^(-5) fmol/(cell·h) decreased the uptake potential significantly at p〈0.1. Bacterial tolerance to formaldehyde suggested propensities of anaplerotic chemical reactions that form metabolic intermediates of C-1 metabolism pathways. The isolates displayed high metabolic flexibility. With the changes in electron donors, the isolates metabolically toggled between relatively anoxic reductive iron/sulfur cycles and the oxidative cycles of manganese/ammonium and vice-versa. This property makes these microbes successful survivors in the highly dynamic Sino-Pacific sediments. 展开更多
关键词 autotrophy bacteria mesophiles heterotrophs Sino-Pacific
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棉秆油渣还田与棉花自养作用
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作者 刘伯衡 田丽萍 《石河子大学学报(自然科学版)》 CAS 1997年第2期131-135,共5页
若将棉秆与油渣作基肥还田,则可归还棉株生长期间所吸收氮、磷、钾、铜、铁、锰、锌、硼等养分总量的95%,从而可以发挥棉花的自养作用。
关键词 棉秆 油渣 还田 自养作用 棉花 施肥量
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An axenic strain reveals the responses of Phaeodactylum tricornutum to external organic carbon
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作者 Zhengfeng ZHU Zhichao HE +6 位作者 Jian LI Chengxu ZHOU Yanrong LI Lin ZHANG Xiaohui LI Spiros NAGATHOS Jichang HAN 《Journal of Oceanology and Limnology》 SCIE CAS 2024年第5期1621-1633,共13页
The model diatom Phaeodactylum tricornutum is considered a promising source of various high value bioproducts,and developing cultivation processes is crucial for its commercialization.Although mixotrophy and heterotro... The model diatom Phaeodactylum tricornutum is considered a promising source of various high value bioproducts,and developing cultivation processes is crucial for its commercialization.Although mixotrophy and heterotrophy have been recommended as effective strategies for microalgal cultivation,previous studies on P.tricornutum have yielded conflicting results in terms of cultivating this microalga.To verify the capacity of this microalga utilizing external organic carbon,both heterotrophic and mixotrophic cultivation with varied carbon sources were performed using an axenic strain.The results demonstrate that glycerol was the only organic carbon that substantially stimulated the growth of P.tricornutum in the presence of light.Sodium acetate(NaAc)at low concentrations could also promote growth,while at high concentrations led to severe inhibition under mixotrophic conditions.The addition of glucose imposed no appreciable impact on either cell density or biomass concentration,confirming that P.tricornutum cannot metabolize external glucose.Subsequently,a comparative analysis between mixotrophy and autotrophy was performed to reveal the influences of glycerol on the cellular metabolism based on growth performances,biochemical compositions,and chlorophyll fluorescence parameters.Results also indicate that the addition of glycerol did not have detrimental effects on the capacity of either pigments biosynthesis or photosynthesis,but enhanced the saturated fatty acids and reduced the unsaturated fatty acids. 展开更多
关键词 Phaeodactylum tricornutum autotrophy mixotrophy fucoxanthin glycerol
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