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Zongze Shao - One of the best experts on this subject based on the ideXlab platform.
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Solimonas marina sp. nov., isolated from Deep Seawater of the Pacific Ocean.
International journal of systematic and evolutionary microbiology, 2020Co-Authors: Xiupian Liu, Qiliang Lai, Fengqin Sun, Yingbao Gai, Zongze ShaoAbstract:A taxonomic study was carried out on strain C16B3T, which was isolated from Deep Seawater of the Pacific Ocean. The bacterium was Gram-stain-negative, oxidase- and catalase- positive and rod-shaped. Growth was observed at salinities of 0-8.0 % and at temperatures of 10-45 °C. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain C16B3T belonged to the genus Solimonas, with the highest sequence similarity to Solimonas terrae KIS83-12T (97.2 %), followed by Solimonas variicoloris MN28T (97.0 %) and the other four species of the genus Solimonas (94.5 -96.8 %). The average nucleotide identity and estimated DNA-DNA hybridization values between strain C16B3T and the type strains of the genus Solimonas were 74.05-79.48 % and 19.5-22.5 %, respectively. The principal fatty acids (>5 %) were summed feature 8 (C18 : 1 ω7c/C18 : 1 ω6c; 20.9 %), iso-C16 : 0 (14.6 %), C16 : 1 ω5c (9.4 %), iso-C12 : 0 (8.4 %), summed feature 2 (C14 : 0 3-OH/iso I-C16 : 1 and C12 : 0 aldehyde; 6.8 %) and C16 : 0 (5.5 %). The G+C content of the chromosomal DNA was 65.37 mol%. The respiratory quinone was determined to be Q-8 (100 %). The polar lipids were diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, four unidentified aminolipids, six unidentified phospholipids and one unidentified polar lipid. The combined genotypic and phenotypic data show that strain C16B3T represents a novel species within the genus Solimonas, for which the name Solimonas marina sp. nov. is proposed, with the type strain C16B3T (=MCCC 1A04678T=KCTC 52314T).
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Devosia marina sp. nov., isolated from Deep Seawater of the South China Sea, and reclassification of Devosia subaequoris as a later heterotypic synonym of Devosia soli.
International journal of systematic and evolutionary microbiology, 2020Co-Authors: Yang Liu, Qiliang Lai, Zongze Shao, Jun Zhang, Honghui ZhuAbstract:A Gram-stain-negative, aerobic, rod-shaped and motile bacterial strain, designated L53-10-65T, was isolated from Deep Seawater of the South China Sea. Strain L53-10-65T was found to grow at 4–41 °C (optimum, 28 °C), at pH 5.0–9.0 (pH 7.0–8.0) and in 0–7 % (w/v) NaCl (2 %). Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain L53-10-65T fell within the genus Devosia , with the highest similarity to Devosia indica IO390501T (98.4 %), followed by ‘ Devosia lucknowensis ’ L15T (97.7 %) and Devosia riboflavina IFO 13584T (96.8 %). The digital DNA–DNA hybridization (dDDH) values between strain L53-10-65T and the three relatives above were 43.7, 21.5 and 20.9 %, respectively; the average nucleotide identity (ANI) values were 91.3, 78.4 and 76.8 %, respectively. These values were below the 70 % dDDH and 95–96 % ANI thresholds for bacterial species delineation. The major cellular fatty acids of strain L53-10-65T were summed feature 8 (C18 : 1 ω7c and/or C18 : 1 ω6c), C18 : 1 ω7c 11-methyl and C16 : 0. The major polar lipids were diphosphatidylglycerol, phosphatidylglycerol and glycolipids. The respiratory quinone was identified as Q-10. The DNA G+C content of strain L53-10-65T was 61.3 mol%. Based on the results of phylogenetic analysis and distinctive phenotypic characteristics, strain L53-10-65T is concluded to represent a novel species of the genus Devosia , for which the name Devosia marina sp. nov. is proposed. The type strain of the species is L53-10-65T (=MCCC 1A05139T=KCTC 72888T). Moreover, we propose that Devosia subaequoris is a later heterotypic synonym of Devosia soli based on the present results.
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Marinibacterium profundimaris gen. nov., sp. nov., isolated from Deep Seawater.
International journal of systematic and evolutionary microbiology, 2015Co-Authors: Qiliang Lai, Xiupian Liu, Fengqin Sun, Zongze ShaoAbstract:A taxonomic study was carried out on strain 22II1-22F33T, which was isolated from Deep Seawater of the Atlantic Ocean. The bacterium was Gram-stain-negative, oxidase-positive and weakly catalase-positive, oval in shape without flagellum. Growth was observed at salinities of 0–12 % and at temperatures of 4–41 °C. The isolate was capable of hydrolysing aesculin and Tween 80 and reduction of nitrate to nitrite, but unable to hydrolyse gelatin. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain 22II1-22F33T belongs to the family Rhodobacteraceae, with highest sequence similarity to Pseudooceanicola marinus AZO-CT (96.5 %). The principal fatty acids (>10 %) were summed feature 8 (C18 : 1ω7c/ω6c) (73.8 %). The G+C content of the genomic DNA was 66.2 mol%. The respiratory quinone was Q-10 (100 %). Phosphatidylethanolamine (PE), phosphatidylglycerol (PG), phosphatidylcholine (PC), two unidentified aminolipids (ALs), six unidentified phospholipids (PLs) and one unidentified lipid (L) were present. The combined genotypic and phenotypic data show that strain 22II1-22F33T represents a novel species within a new genus, for which the name Marinibacterium profundimaris gen. nov., sp. nov. is proposed. The type strain of Marinibacterium profundimaris is 22II1-22F33T ( = LMG 27151T = MCCC 1A09326T).
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Stappia indica sp. nov., isolated from Deep Seawater of the Indian Ocean.
International journal of systematic and evolutionary microbiology, 2009Co-Authors: Qiliang Lai, Jun Yuan, Fengqin Sun, Nan Qiao, Zongze ShaoAbstract:A taxonomic study was carried out on strain B106(T), which was isolated from a polycyclic aromatic hydrocarbon-degrading consortium, enriched with Deep Seawater from the Indian Ocean. The isolate was Gram-negative, oxidase- and catalase-positive, rod-shaped and motile by means of one polar flagellum. Growth was observed at salinities of 0.5-11 % and at temperatures of 4-42 degrees C, and the strain was capable of nitrate reduction, but was unable to degrade Tween 80 or gelatin. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain B106(T) belonged to the genus Stappia, with a highest sequence similarity of 97.7 % to Stappia stellulata IAM 12621(T); similarity to other strains was below 95.2 %. DNA-DNA hybridization between strain B106(T) and S. stellulata IAM 12621(T) was 43 %. The major fatty acids were C(16 : 0) (6.10 %), C(18 : 1)omega7c (62.58 %), C(18 : 0) (5.17 %), C(18 : 1)omega7c 11-methyl (14.48 %) and C(19 : 0)omega8c cyclo (4.70 %). The G+C content of the chromosomal DNA was 65.9 mol%. The combined genotypic and phenotypic data showed that strain B106(T) represents a novel species of the genus Stappia, for which the name Stappia indica sp. nov. is proposed, with the type strain B106(T) (=PR56-8(T)=CCTCC AB 208228(T)=LMG 24625(T)=MCCC 1A01226(T)).
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Maribaculum marinum gen. nov., sp. nov., isolated from Deep Seawater.
International journal of systematic and evolutionary microbiology, 2009Co-Authors: Qiliang Lai, Jun Yuan, Zongze ShaoAbstract:A taxonomic study was carried out on strain P38(T), which was isolated from an enriched polycyclic aromatic hydrocarbon-degrading consortium from a Deep Seawater sample collected from the Indian Ocean. Phylogenetic analyses based on 16S rRNA gene sequences showed that strain P38(T) formed a distinct evolutionary lineage within the family Hyphomonadaceae. Strain P38(T) was most closely related to members of the genera Hyphomonas (92.3-93.5 % 16S rRNA gene sequence similarity), Hirschia (88.8 %), Maricaulis (88.3-88.6 %), Hellea (87.5 %), Oceanicaulis (87.4 %) and Robiginitomaculum (86.7 %) of the family Hyphomonadaceae. The DNA G+C content of strain P38(T) was 61.0 mol% and the predominant cellular fatty acids were C(16 : 0) (20 %), C(17 : 0) (5.7 %), C(18 : 1)omega7c (37.7 %), C(18 : 0) (6.3 %) and C(18 : 1)omega7c 11-methyl (7.1 %). Strain P38(T) was distinguishable from members of phylogenetically related genera by differences in several phenotypic properties. On the basis of the phenotypic and phylogenetic data, strain P38(T) represents a novel species of a new genus, for which the name Maribaculum marinum gen. nov., sp. nov. is proposed. The type strain of Maribaculum marinum is P38(T) (=CCTCC AB 208227(T)=LMG 24711(T)=MCCC 1A01086(T)).
Dong-hyun Roh - One of the best experts on this subject based on the ideXlab platform.
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Roseovarius halotolerans sp. nov., isolated from Deep Seawater.
INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY, 2009Co-Authors: Hayung-joon Lim, In-tae Cha, Jaesoo Yoo, Ui Gum Kang, Sung-keun Rhee, Dong-hyun RohAbstract:A Gram-reaction-negative, non-motile, aerobic bacterium, designated HJ50T, was isolated from Deep Seawater of the East Sea, South Korea. Cells were ovoid to rod-shaped (0.5–0.8×1.3–3.0 μm), often with unequal ends, suggesting a budding mode of reproduction. The strain had an absolute requirement for sea salts and tolerated up to 20 % (w/v) sea salts. Propionate, dl-lactate, 2-ketogluconate, 3-hydroxybutyrate and rhamnose were used as growth substrates, but not mannitol, salicin, 4-hydroxybenzoate or acetate. The major fatty acid was summed feature 7 (C18 : 1 ω7c/ω9t/ω12t) and the DNA G+C content was 59.0±0.1 mol%. Phylogenetic analyses based on 16S rRNA gene sequences showed that this strain was affiliated with the genus Roseovarius. Similarities between the 16S rRNA gene sequence of strain HJ50T (1430 nt) and those of type strains of members of the genus Roseovarius were 94.1–96.3 %. DNA–DNA relatedness values between strain HJ50T and the type strains of members of the genus Roseovarius were low (1.3–24.6 %). Physiological and biochemical differences support assignment of strain HJ50T to the genus Roseovarius as a representative of a novel species. The name Roseovarius halotolerans sp. nov. is proposed, with HJ50T (=KCTC 22224T =LMG 24468T) as the type strain.
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Roseovarius halotolerans sp. nov., isolated from Deep Seawater.
International journal of systematic and evolutionary microbiology, 2009Co-Authors: Hayung-joon Lim, In-tae Cha, Jaesoo Yoo, Ui Gum Kang, Sung-keun Rhee, Dong-hyun RohAbstract:A Gram-reaction-negative, non-motile, aerobic bacterium, designated HJ50(T), was isolated from Deep Seawater of the East Sea, South Korea. Cells were ovoid to rod-shaped (0.5-0.8x1.3-3.0 mum), often with unequal ends, suggesting a budding mode of reproduction. The strain had an absolute requirement for sea salts and tolerated up to 20 % (w/v) sea salts. Propionate, dl-lactate, 2-ketogluconate, 3-hydroxybutyrate and rhamnose were used as growth substrates, but not mannitol, salicin, 4-hydroxybenzoate or acetate. The major fatty acid was summed feature 7 (C(18 : 1)omega7c/omega9t/omega12t) and the DNA G+C content was 59.0+/-0.1 mol%. Phylogenetic analyses based on 16S rRNA gene sequences showed that this strain was affiliated with the genus Roseovarius. Similarities between the 16S rRNA gene sequence of strain HJ50(T) (1430 nt) and those of type strains of members of the genus Roseovarius were 94.1-96.3 %. DNA-DNA relatedness values between strain HJ50(T) and the type strains of members of the genus Roseovarius were low (1.3-24.6 %). Physiological and biochemical differences support assignment of strain HJ50(T) to the genus Roseovarius as a representative of a novel species. The name Roseovarius halotolerans sp. nov. is proposed, with HJ50(T) (=KCTC 22224(T) =LMG 24468(T)) as the type strain.
Qiliang Lai - One of the best experts on this subject based on the ideXlab platform.
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Solimonas marina sp. nov., isolated from Deep Seawater of the Pacific Ocean.
International journal of systematic and evolutionary microbiology, 2020Co-Authors: Xiupian Liu, Qiliang Lai, Fengqin Sun, Yingbao Gai, Zongze ShaoAbstract:A taxonomic study was carried out on strain C16B3T, which was isolated from Deep Seawater of the Pacific Ocean. The bacterium was Gram-stain-negative, oxidase- and catalase- positive and rod-shaped. Growth was observed at salinities of 0-8.0 % and at temperatures of 10-45 °C. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain C16B3T belonged to the genus Solimonas, with the highest sequence similarity to Solimonas terrae KIS83-12T (97.2 %), followed by Solimonas variicoloris MN28T (97.0 %) and the other four species of the genus Solimonas (94.5 -96.8 %). The average nucleotide identity and estimated DNA-DNA hybridization values between strain C16B3T and the type strains of the genus Solimonas were 74.05-79.48 % and 19.5-22.5 %, respectively. The principal fatty acids (>5 %) were summed feature 8 (C18 : 1 ω7c/C18 : 1 ω6c; 20.9 %), iso-C16 : 0 (14.6 %), C16 : 1 ω5c (9.4 %), iso-C12 : 0 (8.4 %), summed feature 2 (C14 : 0 3-OH/iso I-C16 : 1 and C12 : 0 aldehyde; 6.8 %) and C16 : 0 (5.5 %). The G+C content of the chromosomal DNA was 65.37 mol%. The respiratory quinone was determined to be Q-8 (100 %). The polar lipids were diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, four unidentified aminolipids, six unidentified phospholipids and one unidentified polar lipid. The combined genotypic and phenotypic data show that strain C16B3T represents a novel species within the genus Solimonas, for which the name Solimonas marina sp. nov. is proposed, with the type strain C16B3T (=MCCC 1A04678T=KCTC 52314T).
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Devosia marina sp. nov., isolated from Deep Seawater of the South China Sea, and reclassification of Devosia subaequoris as a later heterotypic synonym of Devosia soli.
International journal of systematic and evolutionary microbiology, 2020Co-Authors: Yang Liu, Qiliang Lai, Zongze Shao, Jun Zhang, Honghui ZhuAbstract:A Gram-stain-negative, aerobic, rod-shaped and motile bacterial strain, designated L53-10-65T, was isolated from Deep Seawater of the South China Sea. Strain L53-10-65T was found to grow at 4–41 °C (optimum, 28 °C), at pH 5.0–9.0 (pH 7.0–8.0) and in 0–7 % (w/v) NaCl (2 %). Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain L53-10-65T fell within the genus Devosia , with the highest similarity to Devosia indica IO390501T (98.4 %), followed by ‘ Devosia lucknowensis ’ L15T (97.7 %) and Devosia riboflavina IFO 13584T (96.8 %). The digital DNA–DNA hybridization (dDDH) values between strain L53-10-65T and the three relatives above were 43.7, 21.5 and 20.9 %, respectively; the average nucleotide identity (ANI) values were 91.3, 78.4 and 76.8 %, respectively. These values were below the 70 % dDDH and 95–96 % ANI thresholds for bacterial species delineation. The major cellular fatty acids of strain L53-10-65T were summed feature 8 (C18 : 1 ω7c and/or C18 : 1 ω6c), C18 : 1 ω7c 11-methyl and C16 : 0. The major polar lipids were diphosphatidylglycerol, phosphatidylglycerol and glycolipids. The respiratory quinone was identified as Q-10. The DNA G+C content of strain L53-10-65T was 61.3 mol%. Based on the results of phylogenetic analysis and distinctive phenotypic characteristics, strain L53-10-65T is concluded to represent a novel species of the genus Devosia , for which the name Devosia marina sp. nov. is proposed. The type strain of the species is L53-10-65T (=MCCC 1A05139T=KCTC 72888T). Moreover, we propose that Devosia subaequoris is a later heterotypic synonym of Devosia soli based on the present results.
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Physiological and genomic features of Paraoceanicella profunda gen. nov., sp. nov., a novel piezophile isolated from Deep Seawater of the Mariana Trench
MicrobiologyOpen, 2019Co-Authors: Ping Liu, Qiliang Lai, Wanzhen Ding, Rulong Liu, Yuli Wei, Li Wang, Zhe Xie, Junwei Cao, Jiasong FangAbstract:A novel piezophilic alphaproteobacterium, strain D4M1T , was isolated from Deep Seawater of the Mariana Trench. 16S rRNA gene analysis showed that strain D4M1T was most closely related to Oceanicella actignis PRQ-67T (94.2%), Oceanibium sediminis O448T (94.2%), and Thioclava electrotropha ElOx9T (94.1%). Phylogenetic analyses based on both 16S rRNA gene and genome sequences showed that strain D4M1T formed an independent monophyletic branch paralleled with the genus Oceanicella in the family Rhodobacteraceae. Cells were Gram-stain-negative, aerobic short rods, and grew optimally at 37°C, pH 6.5, and 3.0% (w/v) NaCl. Strain D4M1T was piezophilic with the optimum pressure of 10 MPa. The principal fatty acids were C18:1 ω7c/C18:1 ω6c and C16:0 , major respiratory quinone was ubiquinone-10, and predominant polar lipids were phosphatidylglycerol, phosphatidylethanolamine, and an unidentified aminophospholipid. The complete genome contained 5,468,583-bp with a G + C content of 70.2 mol% and contained 4,855 protein-coding genes and 78 RNA genes. Genomic analysis revealed abundant clues on bacterial high-pressure adaptation and piezophilic lifestyle. The combined evidence shows that strain D4M1T represents a novel species of a novel genus in the family Rhodobacteraceae, for which the name Paraoceanicella profunda gen. nov., sp. nov. is proposed (type strain D4M1T = MCCC 1K03820T = KCTC 72285T ).
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Marinibacterium profundimaris gen. nov., sp. nov., isolated from Deep Seawater.
International journal of systematic and evolutionary microbiology, 2015Co-Authors: Qiliang Lai, Xiupian Liu, Fengqin Sun, Zongze ShaoAbstract:A taxonomic study was carried out on strain 22II1-22F33T, which was isolated from Deep Seawater of the Atlantic Ocean. The bacterium was Gram-stain-negative, oxidase-positive and weakly catalase-positive, oval in shape without flagellum. Growth was observed at salinities of 0–12 % and at temperatures of 4–41 °C. The isolate was capable of hydrolysing aesculin and Tween 80 and reduction of nitrate to nitrite, but unable to hydrolyse gelatin. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain 22II1-22F33T belongs to the family Rhodobacteraceae, with highest sequence similarity to Pseudooceanicola marinus AZO-CT (96.5 %). The principal fatty acids (>10 %) were summed feature 8 (C18 : 1ω7c/ω6c) (73.8 %). The G+C content of the genomic DNA was 66.2 mol%. The respiratory quinone was Q-10 (100 %). Phosphatidylethanolamine (PE), phosphatidylglycerol (PG), phosphatidylcholine (PC), two unidentified aminolipids (ALs), six unidentified phospholipids (PLs) and one unidentified lipid (L) were present. The combined genotypic and phenotypic data show that strain 22II1-22F33T represents a novel species within a new genus, for which the name Marinibacterium profundimaris gen. nov., sp. nov. is proposed. The type strain of Marinibacterium profundimaris is 22II1-22F33T ( = LMG 27151T = MCCC 1A09326T).
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Stappia indica sp. nov., isolated from Deep Seawater of the Indian Ocean.
International journal of systematic and evolutionary microbiology, 2009Co-Authors: Qiliang Lai, Jun Yuan, Fengqin Sun, Nan Qiao, Zongze ShaoAbstract:A taxonomic study was carried out on strain B106(T), which was isolated from a polycyclic aromatic hydrocarbon-degrading consortium, enriched with Deep Seawater from the Indian Ocean. The isolate was Gram-negative, oxidase- and catalase-positive, rod-shaped and motile by means of one polar flagellum. Growth was observed at salinities of 0.5-11 % and at temperatures of 4-42 degrees C, and the strain was capable of nitrate reduction, but was unable to degrade Tween 80 or gelatin. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain B106(T) belonged to the genus Stappia, with a highest sequence similarity of 97.7 % to Stappia stellulata IAM 12621(T); similarity to other strains was below 95.2 %. DNA-DNA hybridization between strain B106(T) and S. stellulata IAM 12621(T) was 43 %. The major fatty acids were C(16 : 0) (6.10 %), C(18 : 1)omega7c (62.58 %), C(18 : 0) (5.17 %), C(18 : 1)omega7c 11-methyl (14.48 %) and C(19 : 0)omega8c cyclo (4.70 %). The G+C content of the chromosomal DNA was 65.9 mol%. The combined genotypic and phenotypic data showed that strain B106(T) represents a novel species of the genus Stappia, for which the name Stappia indica sp. nov. is proposed, with the type strain B106(T) (=PR56-8(T)=CCTCC AB 208228(T)=LMG 24625(T)=MCCC 1A01226(T)).
Marie Boye - One of the best experts on this subject based on the ideXlab platform.
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Potential effects of Deep Seawater discharge by an Ocean Thermal Energy Conversion plant on the marine microorganisms in oligotrophic waters
Science of the Total Environment, 2019Co-Authors: Mélanie Giraud, Veronique Garcon, Denis De La Broise, Stéphane L'helguen, Joël Sudre, Marie BoyeAbstract:Installation of an Ocean Thermal Energy Conversion pilot plant (OTEC) off the Caribbean coast of Martinique is expected to use approximately 100 000 m 3 h-1 of Deep Seawater for its functioning. This study examined the potential effects of the cold nutrient-rich Deep Seawater discharge on the phytoplankton community living in the surface warm oligotrophic waters before the installation of the pilot plant. Numerical simulations of Deep Seawater upwelled by the OTEC, showed that a 3.0 °C temperature change, considered as a critical threshold for temperature impact, was never reached during an annual cycle on the top 150 m of the water column on two considered sections centered on the OTEC. The thermal effect should be limited, less than 1 km 2 on the area exhibited a temperature difference of 0.3 °C (absolute value), producing a negligible thermic impact on the phytoplankton assemblage. The impact on phytoplankton of the resulting mixed Deep and surface Seawater was evaluated by in situ microcosm experiments. Two scenarios of water mix ratio (2 % and 10 % of Deep water) were tested at two incubation depths (Deep chlorophyll-a maximum: DCM and bottom of the euphotic layer: BEL). The larger impact was obtained at DCM for the highest Deep Seawater addition (10 %), with a development of diatoms and haptophytes, whereas 2 % addition induced only a limited change of the phytoplankton community (relatively higher Prochlorococcus sp. abundance, but without significant shift of the assemblage). This study suggested that the OTEC plant would significantly modify the phytoplankton assemblage with a shift from pico-phytoplankton toward micro-phytoplankton only in the case of a discharge affecting the DCM and would be restricted to a local scale. Since the lower impact on the phytoplankton assemblage was obtained at BEL, this depth can be recommended for the discharge of the Deep Seawater to exploit the OTEC plant
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Potential effects of Deep Seawater discharge by an Ocean Thermal Energy Conversion plant on the marine microorganisms in oligotrophic waters
The Science of the total environment, 2019Co-Authors: Mélanie Giraud, Veronique Garcon, Denis De La Broise, Stéphane L'helguen, Joël Sudre, Marie BoyeAbstract:Abstract Installation of an Ocean Thermal Energy Conversion pilot plant (OTEC) off the Caribbean coast of Martinique is expected to use approximately 100,000 m3 h−1 of Deep Seawater for its functioning. This study examined the potential effects of the cold nutrient-rich Deep Seawater discharge on the phytoplankton community living in the surface warm oligotrophic waters before the installation of the pilot plant. Numerical simulations of Deep Seawater upwelled by the OTEC, showed that a 3.0 °C temperature change, considered as a critical threshold for temperature impact, was never reached during an annual cycle on the top 150 m of the water column on two considered sections centered on the OTEC. The thermal effect should be limited,
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Potential effects of Deep Seawater discharge by an Ocean Thermal Energy Conversion plant on the marine microorganisms in oligotrophic waters
2018Co-Authors: Mélanie Giraud, Veronique Garcon, Denis De La Broise, Stéphane L'helguen, Joël Sudre, Marie BoyeAbstract:Abstract. Installation of an Ocean Thermal Energy Conversion pilot plant (OTEC) off the Caribbean coast of Martinique is expected to use approximately 100 000 m3 h−1 of Deep Seawater for its functioning. This study examined the potential effects of the cold nutrient-rich Deep Seawater discharge on the phytoplankton community before the installation of the pilot plant. Thermal effect induced by the Deep Seawater upwelled by the OTEC was described using the Regional Ocean Modeling System. Numerical simulations of Deep Seawater discharge showed that a 3.0 °C temperature change, considered as a critical threshold for temperature impact, was never reached during an annual cycle on the top 150 m of the water column on two considered sections centered on the OTEC. The thermal effect should be limited, less than 1 km2 on the area exhibited a temperature difference of 0.3 °C (absolute value). The impact on phytoplankton of the resulting mixed Deep and surface Seawater was evaluated by in situ microcosm experiments. Two scenario of water mix ratio (2 % and 10 % of Deep water) were tested at two incubation depths (Deep chlorophyll-a maximum: DCM and bottom of the euphotic layer: BEL). The larger impact was obtained at DCM for the highest Deep Seawater addition (10 %), with a development of diatoms, whereas 2 % addition induced only a limited change of the phytoplankton community. This study suggested that the OTEC plant would significantly modify the phytoplankton assemblage only in the case of a discharge affecting the DCM and would be restricted to a local scale.
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Simulation of an artificial upwelling using immersed in situ phytoplankton microcosms
Journal of Experimental Marine Biology and Ecology, 2016Co-Authors: Mélanie Giraud, Marie Boye, Veronique Garcon, Anne Donval, Denis De La BroiseAbstract:The inflow of Deep Seawater in the surface layer by an Ocean Thermal Energy Conversion (OTEC) plant will generate artificial upwelling. In order to study the potential impact on biogeochemical processes that could result, in situ microcosms were designed to simulate Seawater plant discharge and these were deployed off the Caribbean coast of Martinique. Seawater was collected in ultra-clean conditions at maximum chlorophyll a concentrations (45 m depth). The water was then mixed with either 2% or 10% Deep Seawater (1100 m depth) and put in 2.3 L polycarbonate bottles. These microcosms were immersed for 6 days at 45 m depth on a 220 m mooring. Samples from the surrounding environment and from the microcosms were analyzed by pigment quantification, counting of picophytoplankton groups and macronutrient analyses. Similar trends in the evolutions of the phytoplankton populations were observed over time between the control microcosms (without addition of Deep Seawater) and the surrounding environment, suggesting that these microcosms can be used as a realistic representation of the natural surrounding waters over a 6-day incubation period. Microcosm enrichment with 10% Deep Seawater induced a shift in the phytoplankton assemblage towards the development of diatoms, haptophytes, and Prochlorococcus, whereas 2% enrichment only led to an increase in the Prochlorococcus population.
Tonio Sant - One of the best experts on this subject based on the ideXlab platform.
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Exploiting the thermal potential of Deep Seawater for compensating losses in offshore hydraulic wind power transmission pipelines
Iet Renewable Power Generation, 2016Co-Authors: Tonio Sant, Daniel Buhagiar, Robert N. FarrugiaAbstract:The use of hydraulic power transmission to transport offshore wind energy from Deep offshore sites to shore may present a more feasible option for integrating wind farms with land-based hydro-energy storage systems. Yet the incurred losses resulting from fluid friction are significantly larger than those encountered in electrical power cables. This study investigates the possibility of compensating for such losses by exploiting cold Deep-Seawater (DSW) from below thermoclines. A numerical study simulating a single large-scale offshore wind turbine-driven pump supplying DSW to shore across a pipeline in the Central Mediterranean is presented. Seawater leaving the grid-connected hydroelectric power plant is allowed to flow through a centralised district air-conditioning unit operating on a vapour compression cycle. Any shortfall in DSW supply due to lack of wind is compensated for by sea surface water to maintain a constant flow rate. The analysis is repeated for Seawater pipelines having different sizes. It is shown that the Deep Seawater supply from the offshore wind turbine, though being intermittent, reduces the energy consumption of the air-conditioning system considerably. The resulting savings are found to compensate for a significant proportion of the losses encountered in the hydraulic transmission pipeline.
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Using offshore wind technology for large-scale cooling applications:
Wind Engineering, 2016Co-Authors: Matthew Galea, Tonio SantAbstract:A system which makes use of offshore wind energy to directly provide large-scale cooling through the exploitation of cold Deep Seawater below the thermocline is proposed. This system is composed of...
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Coupling of an offshore wind-driven Deep sea water pump to an air cycle machine for large-scale cooling applications
Renewable Energy, 2016Co-Authors: Matthew Galea, Tonio SantAbstract:Abstract A system for using offshore wind energy to directly provide large-scale cooling through the exploitation of cold Deep Seawater below thermocline formations is proposed. The concept is based on an offshore wind-driven hydraulic pump supplying high pressure Deep Seawater to a land based plant. This pressurised Seawater is used to power a hydraulic turbine which drives an inverse Brayton air cycle machine, and is then diverted to a heat exchanger to cool the pressurised air prior to flowing back to the sea. A mathematical model for steady-state performance analysis of the proposed system under specified ambient conditions is presented. It was found that the system coefficient of performance was highest at low wind speeds and improved with increasing ambient temperature and humidity. This makes the system ideal for hot and humid climates. The availability of a sufficiently cold Deep Seawater resource was also found to be crucial for the viability of the system.
