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Mutual effects of nitric oxide and iron on the growth of marine algae

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Acta Oceanologica Sinica 2005年第5期24卷 100-109页

作者： LIU Chunying ZHANG Zhengbin CHEN Xiaorui Institute of marine Chemistry Ocean University of China Qingdao 266003 China

Experiments on the effects of nitric oxide （NO） and iron on the growth of marine microalgae Skeletonema costatum were conducted. The results are as follows： exogenous NO could increase the growth rate of marine algae and raise the biomass remarkably under iron-deficient conditions. But it was a complicated process that the phytoplankton growth was influenced by NO and iron, which was controlled by the NO concentration, the nutrition level of the culture medium and the iron concentration, etc. Meanwhile, the iron concentration in the medium also has a direct influence on the growth and NO release capacity of the algae. Therefore, the effects of NO and iron on the growth of marine phytoplankton were mutual.

关键词： nitric oxide (NO) iron marine algae the mutual effects

Brown marine algae turbinaria conoides as biosorbent for Malachite green removal:Equilibrium and kinetic modeling

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Frontiers of Environmental Science & Engineering 2010年第1期4卷 116-122页

作者： R.RAJESH KANNAN M.RAJASIMMAN N.RAJAMOHAN B.SIVAPRAKASH Environmental Engineering Laboratory Department of Chemical EngineeringAnnamalai UniversityAnnamalai Nagar-608002Tamil NaduIndia

In this study,the biosorption of Malachite green(MG)onto Turbinaria conoides,brown marine algae,was studied with respect to initial pH,temperature,initial dye concentration,and sorbent *** optimum initial pH and temperature values for MG removal were found to be 8.0 and 30℃,*** dosage was found to strongly influence the removal of *** studies were carried out to test the validity of the Langmuir(q_(max)=66.6 mg/g and b=0.526 mL mol/L)and the Freundlich(n=1.826 and K=3.751 mg/g)*** kinetic studies indicated the validity of the pseudo first-order and second-order equation.

关键词： Malachite green(MG) Turbinaria conoides marine algae equilibrium studies biosorption

Oomycetes and fungi:important parasites on marine algae

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Acta Oceanologica Sinica 2010年第5期29卷 74-81页

作者： LI Wei ZHANG Tianyu TANG Xuexi WANG Bingyao College of marine Life Science Ocean University of China Qingdao 266003 China College of Plant Protection Shandong Agricultural University Taian 271018 China

Considering that the field is largely unexplored and its importance to aquaculture,outline of oomycetes and fungi parasiting on marine algae was provided in this paper,including 15 species of oomycetes,six species of chytrids,31 Ascomycota species and one species of mitosporic *** natrue,both the oomycetes and chytrids frequently occurred and induced prevalences of disease which could destroy the populations of host plants ***,the parasites in Ascomycota on algae have never occurred as epidemics so *** issues relating to the field were discussed such as performing tests to satisfy Koch＇s postulates,investigations of host specificity,interactions between host and parasite and the potential effects of environmental factors on occurrence of a disease,which are urgent in need of further investigations.

关键词： oomycetes fungi parasites marine algae

The research on the adsorption effect on metal ions by immobilized marine algae

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Acta Oceanologica Sinica 2006年第2期25卷 153-158页

作者： WANG Xian QIU Haiyuan CAI Zhenzhen CHEN Lidan ZHENG Shenghua HUANG Zhiwei College of Oceanogrophy and Environmental Science Xiamen UniversityXiamen 361005China

The process of adsorption of Cu^2+ Cd^2+ by immobilized marine algae was investigated, it can be noted from the results that, the process for biosorption of heavy metals (copper, cadmium) by immobilized Laminaria japonica can be described by the Banerm model. According to the model, the adsorption rate constant calculated was 0.107 8 and 0.030 28 min^-1 for Cu^2+ and Cd^2+ respectively. The experimental biosorption equilibrium data for Cu^2+ and Cd^2+ were in good agreement with those calculated by the Langmuir model. The maximum uptake capacity calculated was 83.3 and 112.4 mg/g for Cu^2+ and Cd^2+ according to the Langmuir model, respectively. The appetency of Laminaria japonica to Cu^2+ was better than Cd^2+.

关键词： marine algae desorption effect metal ion immobilization

The marine Benthic algae Diversity of Gabon: Case of the Rocky Foreshore of Cap Estérias

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Open Journal of marine Science 2022年第4期12卷 127-140页

作者： Sylvie Brizard Zongo Franck Estimé Ngohang Brice Didier Celce Koumba Mabert Estelle Ndombi Nzaba Frederic Arnold Djounga Joseph Privat Ondo Thomas Stieglitz Département de Biologie Faculté des Sciences Université des Sciences et Techniques de MASUKU Franceville Gabon Département des Laboratoires Direction de la Recherche Ecole Nationale des Eaux et Forêts (ENEF) Cap Estérias Gabon Laboratoire Pluridisciplinaire des Sciences Ecole Normale Supérieure Libreville Gabon Centre Nationale des Données et de l’Information Océanographique IRSH CENAREST Libreville Gabon Centre Européen de Recherche et d’Enseignement des Géosciences de l’Environnement (CEREGE) Aix Marseille Université UM 34 Aix en Provence Cedex 4 France

This study has allowed to classify the marine macroalgae from the intertidal zone on the Atlantic side of Cap Estérias (Gabon). This area has a rich biodiversity but very few studies in the knowledge of benthic macroalgae have been done. The first study on the knowledge of the algae of the Gabonese coast was made in February 1974 by John and Lawson. This article has been revised to transcribe books and our study would aim to update the existing collection. The algae census is spread over a year from August 2020 to August 2021 and is the first detailed study carried out over a year, with regard to this part of the Gabonese coast. This study has allowed to know the specific diversity, to determine the structure of the flora and its spread out over time. The results show a significant algal diversity of thirty five (35) identified species. Three classes of macroalgae were determined and the percentage of species in the class (%EC): Floridaophyceae at 50% EC, Phaeophyceae at 30% EC and Ulvophyceae at 20% EC. The red algae are the most common in the area with sixteen (16) species determined against twelve (12) species of brown algae and seven (7) species of green algae. The Phaeophyceae class presents the Dictyotaceae family which is the most diverse with 7 species found. Some species seen appear in the collection of John et al., but others are new species encountered in Gabon such as Caulerpa sertularioides, Bryopsis plumosa (two Ulvophytes), Padina arborescens which is a Pheophyte and Galaxaura filamentosa, Digenea simplex,Hildenbrandia rubra, Asparagopsis armata and Caulacanthus ustulatus which are Rhodophytes. Some species are permanently present, they are found in all seasons but with significant abundance from July to September.

关键词： marine algae Taxa Atlantic Ocean Cap Estérias

Characteristics of major and trace elements in surface sediments of the Makran Accretionary Prism, Pakistan and their implications for natural gas hydrates

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China Geology 2021年第2期4卷 299-310页

作者： Jian-ming Gong Jing Liao Yu-xi Zhang Jie Liang Jian-wen Chen Nuzhat Khan Syed Waseem Haider Qingdao Institute of marine Geology China Geological SurveyQingdao 266071China Laboratory for marine Mineral Resources Pilot National Laboratory for Marine Science and TechnologyQingdao 266071China Shandong University of Science and Technology Qingdao 266071China National Institute of Oceanography ST-47Block-1CliftonKarachi-75600Pakistan

To accurately identify the natural gas hydrates(NGH)in the sea area of the Makran Accretionary Prism,Pakistan,this paper presents the testing and analysis of major and trace elements in sediment samples taken from two stations(S2 and S3)in the area by the China Geological *** shown by testing results,all major elements are slightly different in content between the two stations except SiO2 and *** also applies to the trace elements that include Sr and Ba primarily and Cr,Ni and Zn *** can be concluded in this study that the tectonic setting of the Makran Accretionary Prism is dominated by oceanic island arc and that provenance of the Makran Accretionary Prism is dominated by felsic igneous provenance,which is at the initial weathering stage and mainly consists of *** terrigenous detritus,there are sediments possibly originating from Makran-Bela Ophiolite from the northwestern part and Murray Ridge igneous rocks from the southeastern *** V/Cr,Ni/Co,and V/(V+Ni)ratios indicate that sediments of the two stations are in an oxidation-suboxidation ***,the authors infer that the sedimentary environment of the sediments 3.0 m below the seafloor tends to be gradually transformed into a reduction environment by comparison with the Qiongdongnan Basin in the South China Sea where NGH has been *** sediments in the Makran Accretionary Prism are rich in organic matter,with total organic carbon(TOC)content greater than 1%.According to comprehensive research,the organic matter in the sediments mainly originates from marine algae and has high TOC content,which is favorable for the formation of NGH.

关键词： Characteristics of major and trace elements Natural gas hydrates marine algae Total organic carbon Makran Accretionary Prism NGH exploration trial engineering Arabian Sea Pakistan

Bioactive compounds from larvicidal and antibacterial Caulerpa racemosa as a potent agent

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Frontiers in Biology 2014年第4期9卷 300-305页

作者： Sowmya Rachannanavar NAGARAJ Jabez William OSBORNE School of Biosciences and Technology VIT University Vellore- 632014 Tamil Nadu India

marine algae are rich sources ofbioactive compounds capable of harboring secondary metabolites which are structurally and biologically active. In our study, the methanolic extract of marine algae Caulerpa racemosa （green algae） was employed to determine the antibacterial and larvicidal activity. The antibacterial activity showed effective inhibition against five pathogenic bacteria. A significant zone size of 16 mm was observed for Pseudomonas aeruginosa. The methanolic extract of Caulerpa racemosa showed effective larvicidal activity against Culex tritaeniorhynchus and the histopathological studies revealed the rupture in mid gut of larvae. The bioactive compounds in the crude extract were further identified as 2-（-3-bromo-1-adamantyl） acetic acid methyl ester and Chola-5, 22- dien-3-ol by GC-MS. Hence the bioactive compounds obtained from the methanolic extracts could be used for the bactericidal and larvicidal activity which will overcome the harmful impact of synthetic insecticide on environment.

关键词： marine algae GC-MS antibacterial larvicidal bioactive compounds

Study on Nano-silver coating in Anti-microbial attachment

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Study on Nano-silver coating in Anti-microbial attachment

Isolation and identification of two strains of pathogenic bacteria and their effects on the volatile metabolites of Gracilariopsis lemaneiformis（Rhodophyta）

第七届全国材料科学与图像科技学术会议

作者： Guan-hui GAO1,a,Xui-ting Chang,Sha CHENG,Yan-hua LEI,Yan-sheng YIN1,~* 1.Institute of Materials Science and Engineering,Ocean University of China,Qingdao,China

this paper is prepared by spin coating using different concentrations of nanosilver coating,in order to explore anti-attachment to the coating surface in different marine algae *** results show that nanosilver coating have a better inhibitory effect in marine Synechococcus *** Nitzschia closterium,and the higher content of nanosilver concentration,the more obvious of the inhibition for algae attaching to the nanosilver coating,a blank piece of quartz is immersed in the Nitzschia closterium solution for 14 days,the adhesion capacity is to 350 cfu/cm,however the coating surface of containing 20% nanosilver is almost no *** actual immersion test of marine environment indicates that the composite coating of polyurethane doping nanosilver can effectively prevent marine organisms attaching to the surface,when the content 20%of nanosilver,the surface combination of the composite coating demonstrates well,which plays a important role in preventing marine organisms attachment.

关键词： nanosilver marine algae anti-attachment

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Isolation and identification of two strains of pathogenic ba...