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Phycological research 14건

  1. [해외논문]   Corrigendum  


    Phycological research v.66 no.3 ,pp. NA , 2018 , 1322-0829 ,

    초록

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  2. [해외논문]   Issue Information  


    Phycological research v.66 no.3 ,pp. 159 - 160 , 2018 , 1322-0829 ,

    초록

    Collecting in New Ireland, Papua New Guinea. Upper left: coastal mangroves in Karu, Kaguso. Lower left: large mangrove trees distributed near Uparage village, and mangrove visitors. Right: Caloglossa thalli attached to an aerial root of a mangrove tree. Photos by M. Kamiya. See Kamiya et al . in this issue for details. Cover picture from: Article link here

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  3. [해외논문]   Densification of cyanobacteria from a lake leading to production of β‐cyclocitral and related volatile organic compounds and species change   SCIE

    Arii, Suzue (Graduate School of Environmental and Human Science and Faculty of Pharmacy, Meijo University, Nagoya, Japan) , Tsuji, Kiyomi (Chemistry Division, Kanagawa Prefectural Institute of Public Health, Chigasaki, Japan) , Tomita, Koji (Division of Hygienic Chemistry, Aichi Prefectural Institute of Public Health, Nagoya, Japan) , Hasegawa, Masateru (Graduate School of Environmental and Human Science and Faculty of Pharmacy, Meijo University, Nagoya, Japan) , Yamashita, Ryuji (Graduate School of Environmental and Human Science and Faculty of Pharmacy, Meijo University, Nagoya, Japan) , Bober, Beata (Graduate School of Environmental and Human Science and Faculty of Pharmacy, Meijo University, Nagoya, Japan) , Harada, Ken‐ (Graduate School of Environmental and Human Science and Faculty of Pharmacy, Meijo University, Nagoya, Japan) , Ichi
    Phycological research v.66 no.3 ,pp. 161 - 166 , 2018 , 1322-0829 ,

    초록

    SUMMARY The purpose of the present study was to demonstrate that the lysis with the blue color formation was caused by densification of the cyanobacteria, and related events of the species change in the cyanobacteria were induced by the resulting volatile organic compounds (VOCs), particularly β‐cyclocitral. In order to obtain a high cell density of cyanobacteria in the laboratory, a concentration technique (graduated cylinder method) using the buoyancy of the gas vesicles was successfully used. The collected scum contained mainly Dolichospermum spp. and Microcystis, and the dispersed cyanobacteria were concentrated in the surface layer after several hours and the concentration ratio became approximately 10. The concentrated cyanobacteria were gradually lysed, while some of the cyanobacteria sank to the bottom, which finally died and disappeared. This method has the additional advantage that it is possible to visualize the entire lysis process. During the concentration process, β‐cyclocitral and its oxidation products together with β‐ionone were significantly detected. Because β‐cyclocitral was easily oxidized to the corresponding carboxylic acid, the pH of the water in the graduated cylinder decreased to approximately 6. Under favorable conditions, lysis with the blue color from phycocyanin could be observed due to the acid stress. Overall, the results of the present study were consistent with the hypothesis that VOCs were produced when the cyanobacteria are highly dense, and that the lysis with the blue color formation occurs due to the higher density.

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  4. [해외논문]   Gymnomonas nepalensis gen. et sp. nov. for the naked flagellate strain 'Nepal', formerly identified as Dunaliella lateralis (Volvocales, Chlorophyceae)   SCIE

    Watanabe, Shin (Department of Biology, Graduate School of Science and Engineering, University of Toyama, Toyama, Japan) , Nakada, Takashi (Institute for Advanced Biosciences, Keio University, Tsuruoka, Japan)
    Phycological research v.66 no.3 ,pp. 167 - 172 , 2018 , 1322-0829 ,

    초록

    SUMMARY This study revisited the naked green flagellate strain ‘Nepal’, formerly identified as Dunaliella lateralis Pascher & Jahoda. This strain was concordant with the original description of motile cells, but different in features of the chloroplast morphology, eyespot position and asexual reproduction. Belonging to Oogamochlamydinia , this strain was distinguished from the walled species and another naked species Hapalochloris nozakii Nakada in cell size, ultrastructural features and phylogenetic positions. Based on these features, Gymnomonas nepalensis gen. et sp. nov. is proposed.

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  5. [해외논문]   Molecular cloning of glutathione peroxidase gene of Antarctic ice microalga Chlamydomonas sp. ICE‐L and its expression changes under temperature and salinity stress   SCIE

    Wang, Jin‐ (Guangdong Provincial Key Lab of Pathogenic Biology and Epidemiology for Aquatic Economic Animals, Fisheries College Guangdong Ocean University, Zhanjiang, China) , Hui (Guangdong Provincial Key Lab of Pathogenic Biology and Epidemiology for Aquatic Economic Animals, Fisheries College Guangdong Ocean University, Zhanjiang, China) , Ding, Yu (Guangdong Provincial Key Lab of Pathogenic Biology and Epidemiology for Aquatic Economic Animals, Fisheries College Guangdong Ocean University, Zhanjiang, China) , Tang, Xiao‐ (Department of Bioengineering, Ocean College, Harbin Institute of Technology, Weihai, China) , Chen , Wang, Quan‐ , Fu
    Phycological research v.66 no.3 ,pp. 173 - 181 , 2018 , 1322-0829 ,

    초록

    SUMMARY A complete open reading frame (ORF) encoding a glutathione peroxidase (ICE‐LGPx) was determined from Antarctic Chlamydomonas sp. ICE‐L by the molecular biological methods. The transcriptional expression patterns of ICE‐LGPx under different salinity and temperature stresses were determined by the real‐time polymerase chain reaction, and the activities of ICE‐LGPx were assayed under salinity stress as well. The full‐length cDNA sequence of ICE‐LGPx mRNA was 1956 bp including an ORF of 765 bp. Molecular structure analysis revealed that ICE‐LGPx was a selenium‐dependent glutathione peroxidase (Se‐GPx) containing a form‐2 SECIS (SelenoCysteine Insertion Sequence) element. Phylogenetic analysis showed that ICE‐LGPx displayed parallel evolution with those of Volvox carteri , Chlorella variabilis , Micromonas sp. RCC299 and Micromonas pusilla . The expression analysis results indicated that transcription of ICE‐LGPx was induced by the changes of the salinity and temperature. The change tendency of enzyme activities was similar to that of ICE‐LGPx mRNA level. Time‐ and dose‐dependent effects were observed in the salinity treatments and time‐dependent effects were found in the temperature treatments as well. These results suggested that ICE‐LGPx might play an important role in the acclimatization of Chlamydomonas sp. ICE‐L to salt and low temperature stresses. Furthermore, the results of this investigation may help to clarify the acclimatization and stress response mechanisms of Antarctic ice alga.

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  6. [해외논문]   Improvement of both lipid and biomass productivities of Qatar Chlorocystis isolate for biodiesel production and food security   SCIE

    Saadaoui, Imen (Algal Technologies Program, Centre for Sustainable Development, College of Arts and Sciences, Qatar University, Doha, Qatar) , Bounnit, Touria (Algal Technologies Program, Centre for Sustainable Development, College of Arts and Sciences, Qatar University, Doha, Qatar) , Muraikhi, Maryam (Algal Technologies Program, Centre for Sustainable Development, College of Arts and Sciences, Qatar University, Doha, Qatar) , Rasheed, Rihab (Algal Technologies Program, Centre for Sustainable Development, College of Arts and Sciences, Qatar University, Doha, Qatar) , Alghasal, Ghamza (Algal Technologies Program, Centre for Sustainable Development, College of Arts and Sciences, Qatar University, Doha, Qatar) , Al Jabri, Hareb (Algal Technologies Program, Centre for Sustainable Development, College of Arts and Sciences, Qatar University, Doha, Qatar)
    Phycological research v.66 no.3 ,pp. 182 - 188 , 2018 , 1322-0829 ,

    초록

    SUMMARY Microalgae are considered a very promising alternative for biofuel production. Several strategies were developed to modulate and improve algae metabolites production to meet the requirements for biodiesel production. Most previous research evidenced that the increase of the lipid content is accompanied by a decrease of the biomass production, which increases the cost of the downstream processing. Hence, the challenge is to find special culture conditions that increase the lipid and the biomass productivities simultaneously. In the present work, we developed a strategy for the improvement of biomass and lipid productivities in a novel local microalga isolate, Chlorocystis sp. QUCCCM14, which was not previously known as a promising strain. Indeed, culturing QUCCCM14 using f/2 medium with 10× NaH 2 PO 4 (0.15 g L −1 NaNO 3 and 5.6 mg L −1 NaH 2 PO 4 ) resulted in an improvement of 3.178 folds the lipid productivity reaching 56.121 mg L −1 day −1 and enhanced the biomass productivity reaching 141.363 mg L −1 day −1 , simultaneously. Comparative analyses of the FAME profiles demonstrated that fed‐batch culture with phosphate or nitrate separately leads to a high production of the omega 3 fatty acids (Linolenic acid), whereas fed‐batch culture with phosphate and nitrate simultaneously increased the production of fatty acids suitable for biodiesel production.

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  7. [해외논문]   Distribution patterns of marine planktonic cyanobacterial assemblages in transitional marine habitats using 16S rRNA phylogeny   SCIE

    Singh, Tarkeshwar (Integrative Taxonomy and Microbial Ecology Research Group, Department of Biological Sciences, Indian Institute of Science Education and Research Kolkata (IISERK), Mohanpur, Nadia, West Bengal, India) , Bhadury, Punyasloke (Integrative Taxonomy and Microbial Ecology Research Group, Department of Biological Sciences, Indian Institute of Science Education and Research Kolkata (IISERK), Mohanpur, Nadia, West Bengal, India)
    Phycological research v.66 no.3 ,pp. 189 - 198 , 2018 , 1322-0829 ,

    초록

    SUMMARY The community composition of marine planktonic cyanobacteria in transitional marine habitats can influence its overall contribution to aquatic primary production. To understand distribution patterns of marine planktonic cyanobacterial assemblages, phylogenetic and statistical analyses were undertaken on planktonic cyanobacterial 16S rRNA gene sequences from four transitional marine habitats [Baltic Sea (BL), Monterey Bay (MB), South China Sea (SCS) and Sundarbans (SB)]. Out of 3255 sequences analyzed, only 546 sequences were found to be planktonic cyanobacteria and were considered in this study. Among these, 338 sequences representative of Sundarbans, the world's largest mangrove were generated based on Sanger and Illumina sequencing approaches. Based on 16S rRNA phylogeny, four major taxonomic orders of marine planktonic cyanobacteria were recovered in varying proportions with several novel 16S rRNA sequences in each of the four targeted sites. Members of the order Synechococcales were dominant in all the sites (−94% sequences) while the orders Chroococcales and Oscillatoriales were only detected in SB and SCS sites, respectively. In the phylogenetic tree, sequences representing the major marine picocyanobacterial genus Synechococcus showed overwhelming dominance in SB and they were found in three other sites. Prochlorococcus ‐like sequences were found in sizeable number in MB and SCS but were absent in SB and coastal BL. Synechococcus ‐like sequences were represented by three major marine clusters (5.1, 5.2, and 5.3). Three novel clades as part of Synechococcus cluster were detected only in SB and one novel clade in BL. The majority of OTUs were found to be exclusive to each site, whereas some were shared by two or more sites as revealed by beta‐diversity analysis.

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  8. [해외논문]   Characterization of Porphyra lucasii pigment mutant induced by gamma irradiation   SCIE

    Lee, Hak‐ (Department of Biotechnology and Bioengineering, Interdisciplinary Program of Bioenergy and Biomaterials, Chonnam National University, Gwangju 61186, South Korea) , Jyung (Department of Biotechnology and Bioengineering, Interdisciplinary Program of Bioenergy and Biomaterials, Chonnam National University, Gwangju 61186, South Korea) , Choi, Jong‐ (Department of Biology, Kongju National University, Kongju, South Korea) , il , Kim, Gwang H.
    Phycological research v.66 no.3 ,pp. 199 - 208 , 2018 , 1322-0829 ,

    초록

    The present study describes the isolation of a pigment mutant strain of Porphyra lucasii, which was obtained using gamma irradiation. Gametophytic blades of this seaweed were irradiated with gamma rays at doses of 500 and 1000Gy. After irradiation, red color was observed in the blades exposed to the 500Gy dose. Single somatic cells from these irradiated blades were isolated from archespores and then cultured to obtain pigment mutant blades that are referred to as 500GR in this investigation. Evaluation of genetic variations in these blades was performed using random amplification of polymorphic DNA (RAPD) analysis. Chlorophyll content, antioxidant activity, and total phenolic content were found to be higher in 500GR than in the wild type (WT) algal strain. Protein extracts obtained from the blades were examined using 2D gel electrophoresis; changes in the proteome were finally analyzed using MS/MS. A total of 216 proteins were detected. From these, nine proteins were over-expressed in the pigment spots in 500GR as compared to WT. These results indicate that the over-expressed proteins are either antioxidant enzymes or photosynthesis-related proteins.

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  9. [해외논문]   Photosynthetic responses to photosynthetically active radiation and temperature including chilling‐light stress on the heteromorphic life history stages of a brown alga, Cladosiphon okamuranus (Chordariaceae) from Ryukyu Islands, Japan   SCIE

    Fukumoto, Rika (Faculty of Fisheries, Kagoshima University, Kagoshima, Japan) , Borlongan, Iris Ann (United Graduate School of Agricultural Sciences, Kagoshima University, Kagoshima, Japan) , Nishihara, Gregory N. (Institute for East China Sea Research, Organization for Marine Science and Technology, Nagasaki University, Nagasaki, Japan) , Endo, Hikaru (Faculty of Fisheries, Kagoshima University, Kagoshima, Japan) , Terada, Ryuta (United Graduate School of Agricultural Sciences, Kagoshima University, Kagoshima, Japan)
    Phycological research v.66 no.3 ,pp. 209 - 217 , 2018 , 1322-0829 ,

    초록

    SUMMARY Photosynthetic responses to temperature and photosynthetically active radiation (PAR) were investigated on the heteromorphic life history stages (macroscopic and microscopic stages) of an edible Japanese brown alga, Cladosiphon okamuranus from the Ryukyu Islands. Measurements were carried out by using optical dissolved oxygen sensors and a pulse‐amplitude modulated fluorometer. Maximum net photosynthetic rates and other parameters of the Photosynthesis – PAR curves at 28°C were somewhat similar in both life history stages, without characteristic photoinhibition at 1000 μmol photons m −2 s −1 . Results of oxygenic gross photosynthesis and dark respiration experiments over a temperature range of 8–40°C revealed similar temperature optima for both stages (29.7°C, macroscopic stage; 30.3°C, microscopic stage), which support their observed occurrences in the habitat during summer. Maximum quantum yields of photosystem II ( PSII ) ( F v /F m ) were relatively stable at low temperatures with the highest at 15.1°C for the macroscopic stage and at 16.5°C for the microscopic stage; but dropped at higher temperatures especially above 28°C. Continuous exposures (6 h) to 200 and 1000 μmol photons m −2 s −1 at 8, 16, and 28°C revealed greater depressions in effective quantum yields of PSII ( Φ PSII ) of the microscopic stage at 8°C, as well as its F v /F m that barely increased after 6 h of dark acclimation. Whereas post‐dark acclimation F v /F m of both stages exposed to low PAR fairly recovered at 28°C, suggesting their photosynthetic tolerance to such high temperature. Under natural conditions, both heteromorphic stages of C. okamuranus may persist throughout the year in this region. Beyond its northern limit of distribution, the microscopic stage of this species may suffer from photodamage, as enhanced by low winter temperatures; hence, its restricted occurrence.

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  10. [해외논문]   High species richness and genetic diversity of the genus Caloglossa (Delesseriaceae, Rhodophyta) in New Ireland, Papua New Guinea   SCIE

    Kamiya, Mitsunobu (Faculty of Marine Bioscience, Fukui Prefectural University, Fukui, Japan) , West, John A. (School of Biosciences, University of Melbourne, Melbourne, Victoria, Australia) , Zuccarello, Giuseppe C. (School of Biological Sciences, Victoria University of Wellington, Wellington, New Zealand)
    Phycological research v.66 no.3 ,pp. 218 - 230 , 2018 , 1322-0829 ,

    초록

    ABSTRACT Distribution patterns and genetic diversity of Caloglossa species have been studied in various regions but are still poorly understood around the tropical western Pacific where many marine organisms show high species richness. We explored the diversity of Caloglossa species in New Ireland, Papua New Guinea using morphological and genetic analyses. Seven species of Caloglossa ( C. adhaerens , C. leprieurii , C. ogasawaraensis , C. bengalensis , C. postiae, C. saigonensis and C. vieillardii ) were collected from eight sites; the latter four species are new records in Papua New Guinea. All specimens collected were cultured to compare their morphology under the same culture condition. Reproductive structures of gametophytes and/or sporophytes were described for the first time in some species from these collections. In C. leprieurii , gall‐like structure appeared in most gametophyte strains but not in tetrasporophytes. Such galls were produced from wing cells, and spermatangia and/or procarps were formed on many galls. The LSU rDNA and rbc L analyses revealed high intraspecific diversity in many species although the number of samples was limited and the sampling sites were within 200 km. We revealed high species richness and intraspecific genetic variation in Papua New Guinea, suggesting a hot spot for the diversity of Caloglossa .

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