Climatic changes are anticipated to have a detrimental effect on calcifying marine species. Calcareous red algae may be especially vulnerable to seasonal variations since they are common and essential biologically, but there is little research on the morpho-anatomical, and chemical characterization of such species. This study conducted the seasonal investigation of the three dominant Mediterranean calcified red algae. Morphological and 18S rRNA analysis confirmed the identification of collected species as Corallina officinalis, Jania rubens, and Amphiroa rigida. In general, C. officinalis was represented in the four seasons and flourishing maximum in autumn (70% of total species individuals). While J. rubens species was represented in winter, autumn, and spring and completely absent in summer. A. rigida was abundant only in the summer season by 40%. A full morphological and anatomical description of these species were examined, and their chemical compositions (carbohydrate, protein, lipid, pigments, and elements content) were assessed in different seasons, where carbohydrates were the dominant accumulates followed by proteins and lipids. Pearson correlation analysis confirmed a positive correlation between salinity level and nitrogenous nutrients of the seawater with the pigment contents (phycobiliproteins, carotenoids, and chlorophyll a) of the studied seaweeds. The results proved that calcified red algae were able to deposit a mixture of calcium carbonates such as calcite, vaterite, calcium oxalate, calcite-III I calcium carbonate, and aragonite in variable forms depending on the species.
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http://dx.doi.org/10.1186/s40529-023-00373-0 | DOI Listing |
Spectrochim Acta A Mol Biomol Spectrosc
December 2024
College of Engineering, Nanjing Agricultural University, Nanjing 210031, China.
Spectroscopic technology is an effective method for estimating rice chlorophyll content. However, redundant spectral information and the complex background of rice in situ challenge the accuracy and robustness of the estimation. To address this problem, this study proposed a band selection method combining spectral color characteristics and established a convolutional neural network (CNN) model based on this method to estimate chlorophyll content of rice for black (background-free), clear, muddy, and green algae-covered backgrounds.
View Article and Find Full Text PDFInt J Biol Macromol
January 2025
The State Key Laboratory of Food Science and Technology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China; Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Jiangnan University, Wuxi 214122, China. Electronic address:
Agar is one of the three major colloidal linear polysaccharides obtained from marine seaweeds, specifically red macroalgae (Rhodophyta). It has garnered significant attention owing to its diverse industrial applications, potential for bioethanol production, and the physiological activities of its derived saccharides. This review delves into the preparation and degradation processes of agar, focusing on both physical and chemical pretreatments, as well as subsequent hydrolysis through acid and enzymatic methods.
View Article and Find Full Text PDFJ Dairy Sci
January 2025
Department of Applied Animal Science & Welfare, Swedish University of Agricultural Sciences (SLU), Box 7024, 753 23 Uppsala, Sweden.
Methane emissions from ruminant digestion contribute significantly to global anthropogenic greenhouse gas emissions. Members of the phylum Rhodophyta (red algae), particularly Asparagopsis sp., have shown promising results in reducing methane emissions in ruminants, due to their high content of halogenated methane analog compounds.
View Article and Find Full Text PDFInt J Biol Macromol
December 2024
School of Life Sciences, Yantai University, Shandong 264005, PR China.
Pure phycocyanin (PC) hexamers from red algae were first prepared in this research. PC hexamers are helpful for studying the role and mechanism of PCs in energy transfer within phycobilisomes from red algae. The PC hexamers from Polysiphonia urceolata are stable at lower pH (pH 5.
View Article and Find Full Text PDFEnviron Pollut
December 2024
School of Environmental and Life Sciences, University of Hull, Hull, HU6 7RX, United Kingdom; International Estuarine & Coastal Specialists Ltd., Leven, HU17 5LQ, United Kingdom.
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