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    Tytuł:
    Physiological responses of the eustigmatophycean Nannochloropsis salina to aqueous diesel fuel pollution
    Autorzy:
    Mohammady, Nagwa Gamal-El-Din
    Chen, Yean-Chang
    El-Mahdy, Abd-El-Ruhman Aly
    Mohammad, Rania Farag
    Powiązania:
    https://bibliotekanauki.pl/articles/47635.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    microalga
    diesel fuel pollution
    physiological response
    Nannochloropsis salina
    eustigmatophycean microalga
    Opis:
    The marine eustigmatophycean microalga Nannochloropsis (Monallantus) salina Hibberd was cultivated in a batch culture in the presence of various concentrations (0, 25, 50, 75 and 100%) of an aqueous extract of diesel fuel oil in order to assess the influence of the pollutant on the growth and certain physiological responses of the microalga. The growth data revealed a significant negative effect of the various pollutant concentrations on the algal cell number (p≤0.05). However, at the midlogarithmic growth phase (day 8), the algal cells were analysed for chlorophyll a, β-glucan, amino acid pool, C/N ratio and elemental composition. According to our results, N. salina was significantly affected by the pollution with regard to the different physiological parameters examined, and this significance may be negative, positive or variable. The effect of the pollutant on cellular β-glucan and the total amount of amino acids was negative;h owever, the composition of the cellular amino acid pool remained unaffected. A positive effect of the pollutant on cellular chl a and the C/N ratio was observed. In addition, the pollutant showed variable effects on the composition of different elements, as shown by energy-dispersive X-ray microanalysis. Also, an existence correlation between different elements was statistically reported.
    Źródło:
    Oceanologia; 2005, 47, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical methods of microalgal biomass pretreatment
    Autorzy:
    Piasecka, A.
    Krzeminska, I.
    Tys, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/25591.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    biomass
    sonication
    microwave
    physical method
    microalga
    pretreatment
    lipid content
    Opis:
    The prospect of depletion of natural energy resources on the Earth forces researchers to seek and explore new and alternative energy sources. Biomass is a composite resource that can be used in many ways leading to diversity of products. Therefore, microalgal biomass offers great potential. The main aim of this study is to find the best physical method of microalgal bio- mass pretreatment that guarantees efficient lipid extraction. These studies identifies biochemical composition of microalgal biomass as source for biodisel production. The influence of drying at dif- ferent temperatures and lyophilization was investigated. In addi- tion, wet and untreated biomass was examined. Cell disruption (sonication and microwave) techniques were used to improve lipid extraction from wet biomass. Additionally, two different extrac- tion methods were carried out to select the best method of crude oil extraction. The results of this study show that wet biomass after sonication is the most suitable for extraction. The fatty acid com- position of microalgal biomass includes linoleic acid (C18:2), palmitic acid (C16:0), oleic acid (C18:1), linolenic acid (C18:3), and stearic acid (C18:0), which play a key role in biodiesel production.
    Źródło:
    International Agrophysics; 2014, 28, 3
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mycorrhizal fungi and microalgae modulate antioxidant capacity of basil plants
    Autorzy:
    Hristozkova, M.
    Gigova, L.
    Geneva, M.
    Stancheva, I.
    Vasileva, I.
    Sichanova, M.
    Mincheva, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/65815.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    arbuscular mycorrhiza
    mycorrhizal fungi
    fungi
    microalga
    antioxidant capacity
    basil
    medicinal plant
    Lamiaceae
    Ocimum basilicum
    soil microalga
    Cyanoprokaryota
    soil-plant system
    Opis:
    Mycorrhizal fungi, algae and cyanobacteria are some of the most important soil microorganisms and major components of a sustainable soil-plant system. This study presents for the first time evidence of the impact of green alga and cyanobacterium solely and in combination with arbuscular mycorrhizal fungi (AMF) on plant-antioxidant capacity. In order to provide a better understanding of the impact of AMF and soil microalgae on Ocimum basilicum L. performance, changes in the pattern and activity of the main antioxidant enzymes (AOEs), esterases and non-enzymatic antioxidants including phenols, flavonoids, ascorbate, and α-tocopherols were evaluated. The targeted inoculation of O. basilicum with AMF or algae (alone and in combination) enhanced the antioxidant capacity of the plants and the degree of stimulation varied depending on the treatment. Plants in symbiosis with AMF exhibited the highest antioxidant potential as was indicated by the enhanced functions of all studied leaf AOEs: 1.5-, 2- and more than 10-fold rises of superoxide dismutase (SOD), glutathione-S-transferase (GST) and glutathione reductase (GR), respectively. The greatest increase in the total esterase activity and concentration of phenols, flavonoids and ascorbate was marked in the plants with simultaneous inoculation of mycorrhizal fungi and the green algae. 2,2-diphenyl-1-pycril-hydrazyl (DPPH) free radical scavenging method and ferric reducing antioxidant power (FRAP) assay proved the increased plant antioxidant capacity after co-colonization of green algae and mycorrhizae.
    Źródło:
    Journal of Plant Protection Research; 2017, 57, 4
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First report on Noctiluca scintillans blooms in the Red Sea off the coasts of Saudi Arabia: consequences of eutrophication
    Autorzy:
    Mohamed, Z.A.
    Mesaad, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/48017.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    microalga
    dinoflagellate
    bloom
    coast
    eutrophication
    Saudi Arabia
    Red Sea
    Noctiluca scintillans
    Opis:
    Blooms of Noctiluca scintillans are reported for the first time in the Red Sea off the south-western coasts of Saudi Arabia. During the present study, surface water samples were collected weekly on the coasts of the Al Shuqayq region from February to April 2004–2006. The abundance of N. scintillans correlated negatively with most nutrients, as well as the cell densities of diatoms and dinoflagellate species. Microscopic examination of live cells from Noctiluca blooms showed the presence of some species of diatoms and dinoflagellates within the Noctiluca body – confirmation of its grazing on these microalgae. The presence of a Noctiluca bloom in the coastal waters off south-western Saudi Arabia could be linked indirectly to water eutrophication by an increase in prey abundance. The physico-chemical properties of Red Sea coastal waters should therefore be monitored regularly in order to minimize the formation of harmful algal blooms, which may affect all food web levels, including the human level.
    Źródło:
    Oceanologia; 2007, 49, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Historical occurrences of marine microalgal blooms in Indian Peninsula: Probable causes and implications
    Autorzy:
    Oyeku, O.G.
    Mandal, S.K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079002.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    marine environment
    algal bloom
    microalga
    sea surface
    water temperature
    Indian Peninsula
    Opis:
    The Indian marine environment supports employment for over 200 million people, including revenue of nearly $7 billion per annum. However, ecological goods and services of the shallow coast and the marine environment of the Indian peninsula are being affected by recurrent blooms of microalgae. One hundred and six published literature, starting from the first report in 1908 to 2017, were reviewed to investigate the historical occurrences of marine microalgal blooms (MMBs) around the Indian peninsula. 154 MMBs comprising 24 genera and 7 classes were reported during the study period. Noctiluca (dinophyceae) and Trichodesmium (cyanophyceae) bloom contributed 34.4% and 31.8% of total blooms. PCA revealed that high sea surface temperature (SST) and salinity were significant driving forces for Trichodesmium blooms formation, while high nutrients (NO3-N, PO4-P, and SiO4-Si) and low salinity triggered prymnesiophyceae, raphidophyceae, bacillariophyceae and most of the dinophyceae blooms. Noctiluca blooms were linked with both eutrophication and the abundance of prey organisms. HABs were generally dinophyceae dominated and were associated with mass mortality of aquatic fauna, human intoxication, paralytic, and ciguatera shellfish poisoning and even death. Increasing SST and anthropogenic influences around the Indian peninsula could increase the occurrences of MMBs (including HABs) and the number of causative taxa. Proper safety measures such as routine monitoring of phycotoxin levels in the environment and local seafood are required to be put in place in other to protect the health of the public.
    Źródło:
    Oceanologia; 2021, 63, 1; 51-70
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Towards the production of microalgae biofuels: the effect of the culture medium on lipid deposition
    Autorzy:
    Cuellar Garcia, D.J.
    Rangel-Basto, Y.A.
    Barajas-Solano, A.F.
    Munoz-Penalosa, Y.A.
    Urbina-Suarez, N.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/80961.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biomass production
    biofuel
    microalga
    alga
    Chlorella vulgaris
    Scenedesmus obliquus
    renewable source
    culture medium
    lipid accumulation
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2019, 100, 3
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of oxytetracycline on growth and chlorophyll a fluorescence in green algae (Chlorella vulgaris), diatom (Phaeodactylum tricornutum) and cyanobacteria (Microcystis aeruginosa and Nodularia spumigena)
    Autorzy:
    Siedlewicz, G.
    Zak, A.
    Sharma, L.
    Kosakowska, A.
    Pazdro, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079298.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    oxytetracycline
    microalga
    chlorophyll a
    fluorescence
    green alga
    Chlorella vulgaris
    diatom
    Phaeodactylum tricornutum
    Cyanoprokaryota
    Microcystis aeruginosa
    Opis:
    The study aimed at measuring the influence of a wide range of oxytetracycline concentrations, with particular attention to the low levels of the antibiotic on cyanobacteria Microcystis aeruginosa and Nodularia spumigena, diatom Phaeodactylum tricornutum and the model green algae Chlorella vulgaris by conducting prolonged toxicity tests (lasting 10 days). Standard measurements (cell number, optical density, chlorophyll a concentration) were combined with photosynthetic parameters measurements. The obtained results show that concentrations of oxytetracycline present in the environment can affect tested microorganisms. It was found to decrease photosystem II efficiency and disrupt the photosynthesis process. A careful interpretation of photosynthetic parameters allowed a better understanding of the mode of action of oxytetracycline in relation to non-target photoautotrophic organisms like cyanobacteria and microalgae. In conclusion, it would appear that the use of standard chronic toxicity tests (72 h) does not allow to accurately and reliably assess the chronic impact of bioactive compounds including drugs and their metabolites on water organisms. On this basis, we recommend the application of extended duration tests.
    Źródło:
    Oceanologia; 2020, 62, 2; 214-225
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Proces pirolizy mikroalg jako efektywny sposób pozyskania ciekłego biopaliwa
    Pyrolysis of microalgae as an effective process to derive liquid biofuels
    Autorzy:
    Wadrzyk, M.
    Jakobiec, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/35100.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    mikroalgi
    piroliza
    surowce roslinne
    biomasa
    biopaliwa ciekle
    microalga
    pyrolysis
    plant raw material
    biomass
    liquid biofuel
    Opis:
    W artykule zamieszczono informacje dotyczące kierunku rozwoju źródeł biopaliw pochodzenia roślinnego. Jednym z potencjalnych źródeł najbliższej przyszłości mogą być mikroalgi. Omówiono proces konwersji biomasy mikroalg, w tym proces pirolizy obejmujący pozyskanie ciekłego biopaliwa zwanego bio-olejem oraz możliwości praktycznego zastosowania.
    In this article information about development trends of new biofuels sources is presented. One of the potential raw materials in the nearest future could be microalgae. In this work conversion processes of microalgae, especially pyrolysis, are described. The potential of practical usage of bio-oils derived from microalgae is also mentioned.
    Źródło:
    Acta Agrophysica; 2011, 17, 2[189]
    1234-4125
    Pojawia się w:
    Acta Agrophysica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Live autochthonous benthic diatoms on the lower depths of Arctic continental shelf. Preliminary results
    Autorzy:
    Druzhkova, E.
    Oleinik, A.
    Makarevich, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/48499.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    diatom
    microphytobenthos
    sediment layer
    Barents Sea
    microalga
    Gyrosigma fasciola
    Pleurosigma angulatum
    water column
    continental shelf
    Arctic
    Opis:
    An autochthonous community of benthic diatoms was discovered in June 2015 in the upper sediment layer at depths of 170, 205, and 245 m in the central Barents Sea. At least three benthic microalgae species (Gyrosigma fasciola, Pleurosigma angulatum, and Pleurosigma sp. 1) were detected in the sediment but not the upper water column. Analyses revealed that these benthic microalgae represent a depleted fragment of Arctic littoral microphytobenthos. Compared with the littoral flora, the deep-water assemblage is less diverse and displays low abundance. The data reported here challenge the generally accepted belief that the presence of certain microalgae at significant depths results from vertical or horizontal transfer.
    Źródło:
    Oceanologia; 2018, 60, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fouling organisms (periphyton) inhabiting common reed Phragmites australis in Lake Jamno
    Organizmy poroślowe (perifiton) zasiedlające trzcinę (Phragmites australis) w jeziorze Jamno
    Autorzy:
    Piesik, Z.
    Obolewski, K.
    Wisniewska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/85225.pdf
    Data publikacji:
    2003
    Wydawca:
    Akademia Pomorska w Słupsku
    Tematy:
    periphyton
    common reed
    Phragmites australis
    Lake Jamno
    Baltic Sea
    coastal zone
    Polska
    estuary
    Macoma balthica
    abundance
    biomass
    Protozoa
    Nematoda
    Rotatoria
    Oligochaeta
    Cladocera
    larva
    Chironomidae
    microalga
    Bacillariophyta
    Chlorophyta
    Cyanophyta
    Źródło:
    Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 2002-2003, 07
    1643-0115
    Pojawia się w:
    Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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