DESCRIPTION AND CHARACTERIZATION OF THE ALGAL SPECIES AUREOUMBRA LAGUNENSIS GEN. ET SP. NOV. AND REFERRAL OF AUREOUMBRA AND AUREOCOCCUS TO THE PELAGOPHYCEAE1

1997 ◽  
Vol 33 (6) ◽  
pp. 1042-1048 ◽  
Author(s):  
Hudson R. DeYoe ◽  
Dean A. Stockwell ◽  
Robert R. Bidigare ◽  
Mikel Latasa ◽  
Paul W. Johnson ◽  
...  
Keyword(s):  
Algal Species ◽  
Aureoumbra Lagunensis

Detection, identification and mapping of cyanobacteria — Using remote sensing to measure the optical quality of turbid inland waters

1994 ◽  
Vol 45 (5) ◽  
pp. 801 ◽  
Author(s):  
DLB Jupp ◽  
JTO Kirk ◽  
GP Harris
Keyword(s):  
Remote Sensing ◽  
Algal Species ◽  
Optical Quality ◽  
High Spectral Resolution ◽  
Turbid Waters ◽  
Eastern Australia ◽  
Processing Techniques ◽  
Compact Airborne Spectrographic Imager

The advantages of airborne scanning for the detection, identification and mapping of algal species, cyanobacteria and associated water parameters (such as turbidity) can be realized if current research outcomes are developed into operational methods based on images with high spectral resolution. Evidence for this has become available through data obtained recently in Australia from the Compact Airborne Spectrographic Imager. This paper shows how pigments associated with cyanobacteria are detectable, even in the very turbid waters typical of eastern Australia. It demonstrates how, if the waterbodies and their constituents can be characterized by a programme of field and laboratory measurement, current processing techniques and models allow the concentrations of different constituents (algae and particles) in the photic zone to be estimated and mapped. The challenge for operational remote sensing of optical water quality in Australia (and throughout the world) is seen to have two components. One is to provide an effective characterization of the target inland and adjacent coastal waters and the other is to streamline the data analysis to provide maps of water properties in the time and cost frameworks required for operational use.

MICROPHOTOMETRIC ASSESSMENT OF SPECTRAL ABSORPTION AND ITS POTENTIAL APPLICATION FOR CHARACTERIZATION OF HARMFUL ALGAL SPECIES

1999 ◽  
Vol 35 (6) ◽  
pp. 1438-1446 ◽  
Author(s):  
Steven E. Lohrenz ◽  
Gary L. Fahnenstiel ◽  
Gary J. Kirkpatrick ◽  
Christopher L. Carroll ◽  
Kimberly A. Kelly
Keyword(s):  
Potential Application ◽  
Algal Species ◽  
Spectral Absorption

scholarly journals Molecular and Morphological Characterization of Colaconema formosanum sp. nov. (Colaconemataceae, Rhodophyta)—A New Endophytic Filamentous Red Algal Species from Taiwan

2021 ◽  
Vol 9 (8) ◽  
pp. 809
Author(s):  
Meng-Chou Lee ◽  
Han-Yang Yeh
Keyword(s):  
New Species ◽  
Large Subunit ◽  
Algal Species ◽  
Morphological Characterization ◽  
Bisphosphate Carboxylase ◽  
The Third ◽  
Red Algal ◽  
Southern Taiwan ◽  
A New Species

The genus Colaconema, containing endophytic algae associated with economically important macroalgae, is common around the world, but has rarely been reported in Taiwan. A new species, C. formosanum, was found attached to an economically important local macroalga, Sarcodia suae, in southern Taiwan. The new species was confirmed based on morphological observations and molecular analysis. Both the large subunit of ribulose-1,5-bisphosphate carboxylase/oxygenase (rbcL) and cytochrome c oxidase subunit I (COI-5P) genes showed high genetic variation between our sample and related species. Anatomical observations indicated that the new species presents asexual reproduction by monospores, cylindrical cells, irregularly branched filaments, a single pyrenoid, and single parietal plastids. Our research supports the taxonomic placement of C. formosanum within the genus Colaconema. This study presents the third record of the Colaconema genus in Taiwan.

scholarly journals Preliminary characterization of agglutinins from seven marine algal species.

1986 ◽  
Vol 52 (2) ◽  
pp. 323-331 ◽  
Author(s):  
Kanji Hori ◽  
Keisuke Miyazawa ◽  
Keiji Ito
Keyword(s):  
Algal Species ◽  
Preliminary Characterization ◽  
Marine Algal

scholarly journals Eukaryotic algal phytochromes span the visible spectrum

2014 ◽  
Vol 111 (10) ◽  
pp. 3871-3876 ◽  
Author(s):  
Nathan C. Rockwell ◽  
Deqiang Duanmu ◽  
Shelley S. Martin ◽  
Charles Bachy ◽  
Dana C. Price ◽  
...  
Keyword(s):  
Red Light ◽  
Algal Species ◽  
Visible Spectrum ◽  
Cd Spectroscopy ◽  
Aquatic Environments ◽  
Ectocarpus Siliculosus ◽  
Green Algal ◽  
Photosynthetic Eukaryotes ◽  
Related Proteins

Plant phytochromes are photoswitchable red/far-red photoreceptors that allow competition with neighboring plants for photosynthetically active red light. In aquatic environments, red and far-red light are rapidly attenuated with depth; therefore, photosynthetic species must use shorter wavelengths of light. Nevertheless, phytochrome-related proteins are found in recently sequenced genomes of many eukaryotic algae from aquatic environments. We examined the photosensory properties of seven phytochromes from diverse algae: four prasinophyte (green algal) species, the heterokont (brown algal) Ectocarpus siliculosus, and two glaucophyte species. We demonstrate that algal phytochromes are not limited to red and far-red responses. Instead, different algal phytochromes can sense orange, green, and even blue light. Characterization of these previously undescribed photosensors using CD spectroscopy supports a structurally heterogeneous chromophore in the far-red–absorbing photostate. Our study thus demonstrates that extensive spectral tuning of phytochromes has evolved in phylogenetically distinct lineages of aquatic photosynthetic eukaryotes.

scholarly journals STRUCTURAL CHARACTERIZATION OF AGAR EXTRACTED FROM SIX RED SEAWEED SPECIES GROWING IN THE COAST OF VIETNAM

2017 ◽  
Vol 25 (2) ◽  
pp. 395-403
Author(s):  
Tran Thi Thanh Van ◽  
Bui Minh Ly ◽  
Ngo Quoc Buu ◽  
Chu Dinh Kinh
Keyword(s):  
Structural Characterization ◽  
Algal Species ◽  
Gel Strength ◽  
Raw Material ◽  
Spectroscopic Methods ◽  
Red Seaweed ◽  
Seaweed Species ◽  
Coast Of Vietnam ◽  
Agar Production

Polysaccharides extracted from six red seaweed species growing in Vietnam have been studied. Characterisation of their structure by chemical and spectroscopic methods showed that all of them have a basic repeating structure of alternating 3-linked b-D-galactopyranosyl and 4-linked 3,6-anhydro a-L-galactopyranosyl units with substituted methyl ether groups.   The native agar offers only weak gelling abilities owing to the 4-linked a-L-galactopyranosyl 6-sulfate as its precursor. Conversion of this unit into the corresponding 3,6-anhydride by treating with hot alkali generally led to gel strength increasing. The agars from G. fisheri and G. firma are poorly substituted, while those from G.asiatica, G.tenustipitata and G. heteroclada are partly methylated on position 6 of the 3-linked b-D- galactose. Agar from Gelidiella acerosa is partlly methylated on both positions 6 and 2 of the 4linked 3,6-anhydro a-L-galactose.   The alkali- modified agars have been obtained in acceptable quantities with gel strength of 300932 g/cm2. The obtained results showed that all the six algal species are suitable as raw material for commercial agar production and worthy of further cultivation

scholarly journals A synergic approach for nutrient recovery and biodiesel production by the cultivation of microalga species in the fertilizer plant wastewater

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Indu Ambat ◽  
Sabina Bec ◽  
Elina Peltomaa ◽  
Varsha Srivastava ◽  
Anne Ojala ◽  
...  
Keyword(s):  
Lipid Content ◽  
Algal Species ◽  
Acid Methyl Ester ◽  
Biomass Concentration ◽  
Biomass Productivity ◽  
Biodiesel Production ◽  
Freshwater Microalgae ◽  
Fertilizer Plant ◽  
Solvent Extraction Method

AbstractThe combination of wastewater treatment and biodiesel production using algal cultivation was studied in the present work. The two main goals of the work were achieved by the cultivation of freshwater microalgae such as Chlamydomonas sp., Scenedesmus ecornis, and Scenedesmus communis in two different dilutions of fertilizer plant wastewater (FWWD1 and FWWD2) collected from Yara Suomi Oy, Finland. The growth pattern of different algal species in FWWD1 and FWWD2 was observed. The effect of pH on biomass concentration, lipid content, biomass productivity, and lipid productivity by all three algal species in FWWD1 and FWWD2 were monitored. The maximum biomass concentration and productivity were observed in FWWD1 at pH7.5 for Chlamydomonas sp. and at pH 8.5 for S. ecornis and S. communis. The maximum lipid content was detected in Chlamydomonas sp at pH5.5, followed by S. ecornis and then S. communis at pH 7.5 in FWWD2 obtained after co-solvent extraction method. The most significant removal percentage of COD by all algal species were observed in FWWD1, whereas the highest removal percentage of TN and TP were detected in FWWD2, respectively. The fatty acid methyl ester (FAME) characterization of each algal species in FWWD1 and FWWD2 at their optimum pH was investigated to determine the quality of obtained biodiesel.

Nitric oxide production and signalling in algae

2020 ◽  
Author(s):  
Jeremy Astier ◽  
Jordan Rossi ◽  
Pauline Chatelain ◽  
Agnès Klinguer ◽  
Angélique Besson-Bard ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Rapid Development ◽  
Algal Species ◽  
No Synthase ◽  
No Production ◽  
Nitric Oxide Production ◽  
Signalling Molecule ◽  
Oxide Synthase

Abstract Nitric oxide (NO) was the first identified gaseous messenger and is now well established as a major ubiquitous signalling molecule. The rapid development of our understanding of NO biology in embryophytes came with the partial characterization of the pathways underlying its production and with the decrypting of signalling networks mediating its effects. Notably, the identification of proteins regulated by NO through nitrosation greatly enhanced our perception of NO functions. In comparison, the role of NO in algae has been less investigated. Yet, studies in Chlamydomonas reinhardtii have produced key insights into NO production through the identification of NO-forming nitrite reductase and of S-nitrosated proteins. More intriguingly, in contrast to embryophytes, a few algal species possess a conserved nitric oxide synthase, the main enzyme catalysing NO synthesis in metazoans. This latter finding paves the way for a deeper characterization of novel members of the NO synthase family. Nevertheless, the typical NO–cyclic GMP signalling module transducing NO effects in metazoans is not conserved in algae, nor in embryophytes, highlighting a divergent acquisition of NO signalling between the green and the animal lineages.

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