keyword
https://read.qxmd.com/read/37447108/evaluating-the-combined-effects-of-erythromycin-and-levofloxacin-on-the-growth-of-navicula-sp-and-understanding-the-underlying-mechanisms
#21
JOURNAL ARTICLE
Jie Yang, Waqas Ahmed, Sajid Mehmood, Wenjie Ou, Jiannan Li, Wenxin Xu, Lu Wang, Mohsin Mahmood, Weidong Li
Navicula sp., a type of benthic diatom, plays a crucial role in the carbon cycle as a widely distributed algae in water bodies, making it an essential primary producer in the context of global carbon neutrality. However, using erythromycin (ERY) and levofloxacin (LEV) in medicine, livestock, and aquaculture has introduced a new class of pollutants known as antibiotic pollutants, which pose potential threats to human and animal health. This study aimed to investigate the toxic effects of ERY and LEV, individually or in combination, on the growth, antioxidant system, chlorophyll synthesis, and various cell osmotic pressure indexes (such as soluble protein, proline, and betaine) of Navicula sp...
July 4, 2023: Plants (Basel, Switzerland)
https://read.qxmd.com/read/37379982/evaluation-of-the-toxicity-of-clozapine-on-the-freshwater-diatom-navicula-sp-using-the-ftir-spectroscopy
#22
JOURNAL ARTICLE
Hao-Jun Lei, Xin-Rong Wei, Li-Xia Li, Wei-Jun Sun, Hong-Xing Chen, Dan Li, Lingtian Xie
Clozapine is an often prescribed neuroactive pharmaceutical and frequently detected in the aquatic environments. However, its toxicity on low trophic level species (i.e., diatoms) and associated mechanisms are seldom reported. In this study, the toxicity of clozapine on a widely distributed freshwater diatom Navicula sp. was evaluated using the FTIR spectroscopy along with biochemical analyses. The diatoms were exposed to various concentrations of clozapine (0, 0.01, 0.05, 0.10, 0.50, 1.00, 2.00, 5.00 mg/L) for 96 h...
June 26, 2023: Chemosphere
https://read.qxmd.com/read/37341323/a-spatio-temporal-analysis-of-marine-diatom-communities-associated-with-pristine-and-aged-plastics
#23
JOURNAL ARTICLE
Olivier Laroche, Olga Pantos, Joanne M Kingsbury, Anastasija Zaiko, Jessica Wallbank, Gavin Lear, Jacob Thompson-Laing, Francois Audrezet, Stefan Maday, Fraser Doake, Robert Abbel, Maxime Barbier, Hayden Masterton, Regis Risani, Dawn Smith, Beatrix Theobald, Louise Weaver, Xavier Pochon
Complex microbial communities colonize plastic substrates over time, strongly influencing their fate and potential impacts on marine ecosystems. Among the first colonizers, diatoms play an important role in the development of this 'plastiphere'. We investigated 936 biofouling samples and the factors influencing diatom communities associated with plastic colonization. These factors included geographic location (up to 800 km apart), duration of substrate submersion (1 to 52 weeks), plastics (5 polymer types) and impact of artificial ageing with UV light...
June 21, 2023: Biofouling
https://read.qxmd.com/read/37317322/investigating-the-impacts-of-uvc-radiation-on-natural-and-cultured-biofilms-an-assessment-of-cell-viability
#24
JOURNAL ARTICLE
Cierra R Braga, Kailey N Richard, Harrison Gardner, Geoffrey Swain, Kelli Z Hunsucker
Biofilms are conglomerates of cells, water, and extracellular polymeric substances which can lead to various functional and financial setbacks. As a result, there has been a drive towards more environmentally friendly antifouling methods, such as the use of ultraviolet C (UVC) radiation. When applying UVC radiation, it is important to understand how frequency, and thus dose, can influence an established biofilm. This study compares the impacts of varying doses of UVC radiation on both a monocultured biofilm consisting of Navicula incerta and field-developed biofilms...
May 20, 2023: Microorganisms
https://read.qxmd.com/read/37227623/ship-hull-fouling-diatoms-on-korean-research-vessels-revealed-by-morphological-and-molecular-methods-and-their-environmental-implications
#25
JOURNAL ARTICLE
Jaeyeong Park, Taehee Kim, Buhari Lawan Muhammad, Jang-Seu Ki
Ship biofouling is one of the main vectors for the introduction and global spread of non-indigenous organisms. Diatoms were the early colonizers of ship hulls; however, their community composition on ships is poorly understood. Herein, we investigated the diatom community on the hull samples collected from two Korean research vessels Isabu (IRV) and Onnuri (ORV) on September 2 and November 10, 2021, respectively. IRV showed low cell density (345 cells/cm2 ) compared to ORV (778 cells/cm2 ). We morphologically identified more than 15 species of diatoms from the two research vessels (RVs)...
May 25, 2023: Journal of Microbiology / the Microbiological Society of Korea
https://read.qxmd.com/read/37212895/qualitative-and-quantitative-assessment-of-diatom-deformities-and-protoplasmic-condition-under-metal-and-metalloid-stress
#26
JOURNAL ARTICLE
Sudeeksha Negi, Taejun Han, Jihae Park, Elizabeth A Bergey, Sangeeta, Jyoti Chaubey, Abhishek Kumar, Divyanshi Gupta, Mahima Gupta, Shivangi Singh, Lalit Kumar Pandey
Metals and metalloids are toxic, persistent, and non-biodegradable and can be biomagnified (e.g., Hg), and therefore pose a serious threat to the algal flora of aquatic ecosystems. This laboratory study tested the effects of metals (Zn, Fe, and Hg) and a metalloid (As) on the cell wall morphology and protoplasmic content of living cells of six widespread diatom genera over 28 days. Diatoms exposed to Zn and Fe had a higher frequency of deformed diatom frustules (> 1%) compared to the As, Hg, and control treatments (< 1%)...
May 22, 2023: Protoplasma
https://read.qxmd.com/read/37211165/environmental-impacts-of-microplastic-and-role-of-plastisphere-microbes-in-the-biodegradation-and-upcycling-of-microplastic
#27
JOURNAL ARTICLE
Shivananda Behera, Surajit Das
Increasing usage of plastic has led to the deposition of plastic in the environment which later become microplastic, a pollutant of global concern. These polymeric particles affect the ecosystem bestowing toxicity and impede the biogeochemical cycles. Besides, microplastic particles have been known for their role in aggravating the effect of various other environmental pollutants including organic pollutants and heavy metals. These microplastic surfaces are often colonized by the microbial communities also known as "plastisphere microbes" forming biofilms...
May 19, 2023: Chemosphere
https://read.qxmd.com/read/36934917/rice-husk-as-a-potential-source-of-silicate-to-oceanic-phytoplankton
#28
JOURNAL ARTICLE
Suhas Shetye, Anil Pratihary, Damodar Shenoy, Siby Kurian, Mangesh Gauns, Hema Naik, Bhagyashri Naik, K Nandakumar, Sidhesh Borker
Global oceans are witnessing changes in the phytoplankton community composition due to various environmental stressors such as temperature, stratification, nutrient limitation, and ocean acidification. The Arabian Sea is also undergoing changes in its phytoplankton community composition, especially during winter, with the diatoms being replaced by harmful algal blooms (HABs) of dinoflagellates. Recent studies have already highlighted dissolved silicate (DSi) limitation and change in Silicon (Si)/Nitrogen (N) ratios as the factors responsible for the observed changes in the phytoplankton community in the Arabian Sea...
March 17, 2023: Science of the Total Environment
https://read.qxmd.com/read/36901112/the-relationship-between-rainfall-pattern-and-epilithic-diatoms-in-four-streams-of-central-western-korea-for-three-years-2013-2015
#29
JOURNAL ARTICLE
Eun-A Hwang, In-Hwan Cho, Ha-Kyung Kim, Chen Yi, Baik-Ho Kim
To study the effect of rainfall patterns on diatom communities in four major central western streams on the Korean Peninsula during the monsoon seasons of 2013 through 2015, we measured precipitation, environmental factors, and epilithic diatoms at 42 sites before (May) and after (August and September) each monsoon. The Mangyeonggang river and Sapgyocheon stream (SS) had a high percentage of low-permeability soil, and the stream had the highest proportion (49.1%) of surrounding land in urban areas. Precipitation and precipitation frequency was closely correlated with electrical conductivity and nutrients, and this was particularly evident in SS...
February 24, 2023: International Journal of Environmental Research and Public Health
https://read.qxmd.com/read/36895393/harmful-algae-and-pathogens-on-plastics-in-three-mediterranean-coastal-lagoons
#30
JOURNAL ARTICLE
Vanina Pasqualini, Marie Garrido, Philippe Cecchi, Coralie Connès, Alain Couté, Maria El Rakwe, Maryvonne Henry, Dominique Hervio-Heath, Yann Quilichini, Jérémy Simonnet, Emmanuel Rinnert, Thomas Vitré, François Galgani
Plastic is now a pervasive pollutant in all marine ecosystems. The microplastics and macroplastic debris were studied in three French Mediterranean coastal lagoons (Prevost, Biguglia and Diana lagoons), displaying different environmental characteristics. In addition, biofilm samples were analyzed over the seasons to quantify and identify microalgae communities colonizing macroplastics, and determine potentially harmful microorganisms. Results indicate low but highly variable concentrations of microplastics, in relation to the period and location of sampling...
March 2023: Heliyon
https://read.qxmd.com/read/36801401/diatom-dna-metabarcoding-to-assess-the-effect-of-natural-radioactivity-in-mineral-springs-on-asv-of-benthic-diatom-communities
#31
JOURNAL ARTICLE
Lory-Anne Baker, Aude Beauger, Sofia Kolovi, Olivier Voldoire, Elisabeth Allain, Vincent Breton, Patrick Chardon, Didier Miallier, Céline Bailly, Gilles Montavon, Agnès Bouchez, Frédéric Rimet, Cécile Chardon, Valentin Vasselon, Luc Ector, Carlos E Wetzel, David G Biron
Little is still known about the low dose effects of radiation on the microbial communities in the environment. Mineral springs are ecosystems than can be affected by natural radioactivity. These extreme environments are, therefore, observatories for studying the influence of chronic radioactivity on the natural biota. In these ecosystems we find diatoms, unicellular microalgae, playing an essential role in the food chain. The present study aimed to investigate, using DNA metabarcoding, the effect of natural radioactivity in two environmental compartments (i...
February 17, 2023: Science of the Total Environment
https://read.qxmd.com/read/36592830/microalgal-extract-as-bio-coating-to-enhance-biofilm-growth-of-marine-microalgae-on-microporous-membranes
#32
JOURNAL ARTICLE
C Y Tong, M X Chua, Win Hung Tan, C J C Derek
Microalgal biofilm is a popular platform for algal production, nutrient removal and carbon capture; however, it suffers from significant biofilm exfoliation under shear force exposure. Hence, a biologically-safe coating made up of algal extracellular polymeric substances (EPS) was utilized to secure the biofilm cell retention and cell loading on commercial microporous membrane (polyvinylidene fluoride), making the surfaces more hydrophobic (contact angle increase an up to 12°). Results demonstrated that initial cell adhesion of three marine microalgae (Amphora coffeaeformis, Cylindrotheca fusiformis and Navicula incerta) was enhanced by at least 1...
December 30, 2022: Chemosphere
https://read.qxmd.com/read/36564683/ecological-distribution-of-modern-diatom-in-peatlands-in-the-northern-greater-khingan-mountains-and-its-environmental-implications
#33
JOURNAL ARTICLE
Dongxue Han, Yang Sun, Jinxin Cong, Chuanyu Gao, Guoping Wang
Relationships between diatom assemblages and environmental variables in peatlands of the northern Greater Khingan Mountains are helpful for understanding the indicative significance of diatoms to environment changes, and potentially provide a reference for environmental monitoring and paleoenvironment reconstruction in the edge of monsoon region. In this study, we analyzed modern diatom assemblages and their relationships with environment factors in 30 surface samples from shrubby-herbaceous and herbaceous peatlands based on ordination analysis...
December 23, 2022: Environmental Science and Pollution Research International
https://read.qxmd.com/read/36557241/association-of-different-abo-and-rh-blood-groups-with-the-erythroprotective-effect-of-extracts-from-navicula-incerta-and-their-anti-inflammatory-and-antiproliferative-properties
#34
JOURNAL ARTICLE
Saúl Ruiz-Cruz, Ricardo Iván González-Vega, Ramón Enrique Robles-Zepeda, Aline Reyes-Díaz, José Antonio López-Elías, Maritza Lizeth Álvarez-Ainza, Francisco Javier Cinco-Moroyoqui, Ramón Alfonso Moreno-Corral, Francisco Javier Wong-Corral, Jesús Borboa-Flores, Yaeel Isbeth Cornejo-Ramírez, Carmen Lizette Del-Toro-Sánchez
Previous studies have reported that different blood groups are associated with the risk of chronic degenerative diseases that mainly involve inflammation and neoplastic processes. We investigate the relationship between blood groups and the erythroprotective effect of extracts from Navicula incerta against oxidative damage as a proposal to develop drugs designed for people with a specific blood type related to chronic pathology. The study was carried out through the elucidation of the erythroprotective potential, anti-inflammatory and antiproliferative activity of Navicula incerta ...
December 1, 2022: Metabolites
https://read.qxmd.com/read/36469680/design-and-synthesis-of-a-new-bioactive-compound-for-marine-antifouling-inspired-by-natural-products
#35
JOURNAL ARTICLE
Jiyong Zheng, Haiping Gao, Guanglong Zhang, Zhiyong Sun, Jinwei Zhang, Li Wang, Cunguo Lin
A marine antifouling compound, N -octyl-2-hydroxybenzamide (OHBA), inspired by ceramide and paeonol molecules, was created. First, methyl salicylate was synthesized with salicylic acid and methanol, followed by n -octylamine through an ester-amine condensation reaction. Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy, and mass spectrometry confirmed the characteristic structure of the OHBA compound. Bioassays showed that OHBA inhibits the growth of typical marine fouling organisms, such as Vibrio azureus , Navicula subminuscula , Ulva pertusa , Mytilus edulis , and Amphibalanus amphitrite , indicating its broad-spectrum antifouling ability...
December 5, 2022: Natural Product Research
https://read.qxmd.com/read/36463555/concurrent-bioimaging-of-microalgal-photophysiology-and-oxidative-stress
#36
JOURNAL ARTICLE
João Ezequiel, Matthew R Nitschke, Martin Laviale, João Serôdio, Jörg C Frommlet
The production of reactive oxygen species (ROS) is an unavoidable consequence of oxygenic photosynthesis and represents a major cause of oxidative stress in phototrophs, having detrimental effects on the photosynthetic apparatus, limiting cell growth, and productivity. Several methods have been developed for the quantification of cellular ROS, however, most are invasive, requiring the destruction of the sample. Here, we present a new methodology that allows the concurrent quantification of ROS and photosynthetic activity, using the fluorochrome dichlorofluorescein (DCF) and in vivo chlorophyll a fluorescence, respectively...
December 4, 2022: Photosynthesis Research
https://read.qxmd.com/read/36365584/polyethylene-glycol-b-poly-trialkylsilyl-methacrylate-co-methyl-methacrylate-hydrolyzable-block-copolymers-for-eco-friendly-self-polishing-marine-coatings
#37
JOURNAL ARTICLE
Elisa Guazzelli, Matteo Oliva, Carlo Pretti, Gianfranca Monni, Armand Fahs, Christine Bressy, Elisa Martinelli
Hydrolyzable block copolymers consisting of a polyethylene glycol (PEG) first block and a random poly(trialkylsilyl methacrylate (TRSiMA, R = butyl, isopropyl)- co -methyl methacrylate (MMA)) second block were synthesized by RAFT polymerization. Two PEGs with different molar masses ( M n = 750 g/mol (PEG1) and 2200 g/mol (PEG2)) were used as macro-chain transfer agents and the polymerization conditions were set in order to obtain copolymers with a comparable mole content of trialkylsilyl methacrylate (~30 mole%) and two different PEG mole percentages of 10 and 30 mole%...
October 28, 2022: Polymers
https://read.qxmd.com/read/36272576/marine-microalgal-biofilm-development-and-its-adhesion-propensities-on-commercial-membrane-via-xdlvo-approach
#38
REVIEW
C Y Tong, C J C Derek
An emerging biofilm immobilization method has enabled effortless biomass harvesting and promoted economic feasibility. The current limitation towards the adaptation of this technology is the inadequate understanding of the biofilm interaction towards microporous membrane. Cell adhesion is recognized as the most important step towards the immobilized cultivation of microalgae. Cell attachment kinetic was studied in a short-term batch culture of three marine diatoms, Amphora coffeaeformis, Cylindrotheca fusiformis and Navicula incerta over 96 h on submerged commercial polyvinylidene fluoride (PVDF) membrane under swirling motion of culture medium...
October 19, 2022: Journal of Biotechnology
https://read.qxmd.com/read/36240915/characterization-of-benthic-biofilms-in-mangrove-sediments-and-their-variation-in-response-to-nutrients-and-contaminants
#39
JOURNAL ARTICLE
Lihua Yang, Qian Yang, Li Lin, Tiangang Luan, Nora F Y Tam
Diatom-dominated biofilms and associated extracellular polymeric substances (EPS) may adapt to the stress of long-term exposure to nutrients and anthropogenic contaminants. However, such interactions in contaminated mangrove sediments have rarely been reported. Based on the in situ characterization of biofilm components and environmental factors, the present study aimed to explore the key factors involved in shaping sediment biofilms through correlational and multivariate analyses. The pennate diatom Navicula is the core taxon that plays a crucial role in balancing the abundance of Nitzschia and Cyclotella, and is the main producer of bound-polysaccharides...
October 11, 2022: Science of the Total Environment
https://read.qxmd.com/read/36220430/evaluation-of-membrane-fouling-at-elevated-temperature-impacted-by-algal-organic-matter
#40
JOURNAL ARTICLE
Yin Sim Ng, Sukdarsanan Ragupathy, Aileen Tan Shau Hwai, Kuan Shiong Khoo, Derek Juinn Chieh Chan
Membrane distillation (MD) is a thermally driven technology applied in desalination and water reuse with utilisation of sustainable energy. However, algal organic matter (AOM) could foul membrane critically and plague MD's long-term operational stability. In this study, the soluble extracellular polymeric substance (sEPS) and intracellular organic matter with bound extracellular polymeric substance (IOM + bEPS) of two algal species (Amphora coffeaeformis and Navicula incerta) were exposed to 60 °C, 70 °C and 80 °C for 8 h with polypropylene hydrophobic membrane, simulating heated AOMs contacted with membrane inside MD unit, to study the temperature effect on membrane fouling...
October 8, 2022: Chemosphere
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