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Article
Special Issue-JSMB Marine Biotechnology 2022 Conference
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Article
Kinetic properties of 137Cs uptake by the cesium-accumulating eustigmatophycean microalga
Cesium-137 (137Cs) is one of the radioactive substances that was released into the environment as a result of the Fukushima nuclear disaster. Radiocesium exposure is of great concern due to its potential environm...
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Article
A novel cell lysis system induced by phosphate deficiency in the cyanobacterium Synechocystis sp. PCC 6803
In the cultivation of microalgae for the production of useful compounds, cell disruption to extract the products of interest is a bottleneck process. To establish a cost-effective method to recover these cellu...
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Article
Open AccessOverexpression of Tisochrysis lutea Akd1 identifies a key cold-induced alkenone desaturase enzyme
Alkenones are unusual long-chain neutral lipids that were first identified in oceanic sediments. Currently they are regarded as reliable palaeothermometers, since their unsaturation status changes depending on...
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Article
Open AccessCold-induced metabolic conversion of haptophyte di- to tri-unsaturated C37 alkenones used as palaeothermometer molecules
The cosmopolitan marine haptophyte alga Emiliania huxleyi accumulates very long-chain (C37-C40) alkyl ketones with two to four trans-type carbon-carbon double bonds (alkenones). These compounds are used as biomar...
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Article
Changes in the accumulation of alkenones and lipids under nitrogen limitation and its relation to other energy storage metabolites in the haptophyte alga Emiliania huxleyi CCMP 2090
Alkenones are long-chain methyl/ethyl ketones (mainly in length of C37-C39) with two to four trans-unsaturated bonds produced by several kinds of marine haptophytes such as Emiliania huxleyi (coccolithophore). Th...
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Article
Development of engineered sensor perceiving gaseous toluene signal in the cyanobacterium Synechocystis sp. PCC 6803
Microalgae have been used to produce useful compounds. In many cases in which target compounds are produced from CO2 via photosynthesis, there is a trade-off between the proliferation of cells and the production ...
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Chapter
Accumulation of Cesium by Aquatic Plants and Algae
A huge activity of radioactive matter including biophilic elements such as cesium, strontium and iodine were released into the environment from the Fukushima 1st Nuclear Power Plant (F1NPP) which was destroyed...
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Chapter
Selenium in Algae
Selenium (Se) is an essential trace element for many organisms in order to be required for the synthesis of selenoproteins although it is very toxic at high concentration. More than 40 selenoprotein families h...
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Article
Open AccessLight intensity modulation by coccoliths of Emiliania huxleyi as a micro-photo-regulator
In this study, we present experimental evidence showing that coccoliths have light-scattering anisotropy that contributes to a possible control of solar light exposure in the ocean. Changing the angle between ...
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Article
Open AccessQuantitative Analysis of Carbon Flow into Photosynthetic Products Functioning as Carbon Storage in the Marine Coccolithophore, Emiliania huxleyi
The bloom-forming coccolithophore Emiliania huxleyi (Haptophyta) is a dominant marine phytoplankton, cells of which are covered with calcareous plates (coccoliths). E. huxleyi produces unique lipids of C37–C40 lo...
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Article
Open AccessDifference in physiological responses of growth, photosynthesis and calcification of the coccolithophore Emiliania huxleyi to acidification by acid and CO2 enrichment
Ocean acidification, one of the great global environmental issues at present, is expected to result in serious damage on marine calcareous organisms such as corals and calcifying algae, which potentially relea...
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Article
Open AccessGlobal searches for microalgae and aquatic plants that can eliminate radioactive cesium, iodine and strontium from the radio-polluted aquatic environment: a bioremediation strategy
The Fukushima 1 Nuclear Power Plant accident in March 2011 released an enormously high level of radionuclides into the environment, a total estimation of 6.3 × 1017 Bq represented by mainly radioactive Cs, Sr, an...
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Article
Open AccessChanges in alkaline band formation and calcification of corticated charophyte Chara globularis
Calcification by charophytes improves the quality of water, although most studies on calcification have only examined ecorticate species. We investigated the formation and relationship of alkalines and acids w...
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Chapter and Conference Paper
Novel Conversion of Chl a into Chl d Catalyzed by Grated Vegetables
Novel conversion of Chl a to Chl d was observed when Chl a was incubated in aqueous acetone with grated papaya(skin), Japanese radish(root), wasabi(rhizome), turnip(root), broccoli(stalk), white radish(leaf), cab...
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Chapter and Conference Paper
Chlorophyll d Production in Crushed Algae in Aqueous Acetone
We for the first time report on the Chl a to Chl d conversion in crushed algae, Synechocystis sp. PCC6803, Emiliania huxleyi, Gephyrocapsa oceanica, Isochrysis galbana, Helladosphaera cornifera, Pleurochrysis car...
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Chapter and Conference Paper
Conversion of Chl a into Chl d by Horseradish Peroxidase
We report for the first time on the Chl a into Chl d conversion with horseradish peroxidase in aqueous acetone at room temperature in the dark, both in the presence and absence of hydrogen peroxide, H2O2. After 4...
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Chapter and Conference Paper
Nonenzymatic Formation of Chl d from Chl a with Hydrogen Peroxide
Nonenzymatic conversion of Chl a to Chl d was performed for the first time by dilute hydrogen peroxide (H2O2) in aqueous acetone (acetone/dilute H2O2 = 10/1, v/v) at 303 K in the dark. The conversion was observed...
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Article
Molecular Characterization of Adenosine 5′-monophosphate Deaminase—The Key Enzyme Responsible for the Umami Taste of Nori (Porphyra yezoensis Ueda, Rhodophyta)
The enzyme adenosine 5′-monophosphate deaminase (AMPD, EC 3.5.4.6) catalyzes the conversion of adenosine 5′-monophosphate to inosine 5′-mononucleotide (IMP). IMP is generally known as the compound responsible ...
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Article
Regulation of the expression of H43/Fea1 by multi-signals
The composition of extracellular proteins is known to be drastically changed in the unicellular green alga Chlamydomonas reinhardtii when the cells are transferred from ambient CO2 to elev...
