Article
Microbiology
Timothy L. Haskett, Hayley E. Knights, Beatriz Jorrin, Marta D. Mendes, Philip S. Poole
Summary: Utilizing a modified in situ acetylene reduction assay (ARA) with barley as the host, nitrogenase activity in diazotrophic bacteria can be rapidly and reliably assessed, aiding in the identification of high-quality plant-associative diazotrophs.
FRONTIERS IN MICROBIOLOGY
(2021)
Article
Forestry
Yo-Jin Shiau, Yu-Te Lin, Rita S. W. Yam, Ed-Haun Chang, Jhe-Ming Wu, Tsu-Hsuan Hsu, Chih-Yu Chiu
Summary: The study found that nitrogenase activity and diazotrophic abundance in mangrove forests varied between upstream and downstream environments, suggesting that these factors may not be positively correlated. Additionally, sulfate-reducing bacteria were identified as potentially major active diazotrophs in this environment.
Article
Biology
Kshitij Tandon, Francesco Ricci, Joana Costa, Monica Medina, Michael Kuhl, Linda L. Blackall, Heroen Verbruggen
Summary: Currently, our understanding of the coral holobiont microbiomes is biased towards the coral tissue, neglecting the diversity of the coral skeleton microbiome. Through genomic analysis of the coral skeletons of Porites lutea and Isopora palifera, we found a wide range of stress response genes and genes involved in maintaining host association in the skeleton microbiomes. The skeletal microbiome also plays important roles in metabolic processes such as nitrogen fixation and nitrate reduction.
Article
Biodiversity Conservation
Xiaoyang Fan, Guodi Yuan, Wenyao Liu
Summary: This study examined the response of bryophyte-associated microbiomes and their nitrogenase activity to changes in water content. The findings suggest that both excessive and insufficient water content inhibit nitrogen fixation, and long-term drought conditions can reduce nitrogenase activity in cyanobacteria-bryophyte associations.
ECOLOGICAL INDICATORS
(2022)
Article
Soil Science
D. S. Epp Schmidt, M. A. Cavigelli, J. E. Maul, H. H. Schomberg, S. A. Yarwood
Summary: This study evaluated the effects of glyphosate on biological N-fixation, soil microbial community dynamics, and soil nifH gene quantity in different crop management systems. The results showed that the effects of glyphosate on different N-fixing components did not behave in a coordinated manner, indicating that they were likely governed by separate mechanisms.
APPLIED SOIL ECOLOGY
(2023)
Article
Agronomy
Vatsala Koul, Mandira Kochar
Summary: The small RNA sSp_p6 from Azospirillum brasilense Sp245 plays an important role in nitrogen metabolism, being modulated under carbon and nitrogen stress and interacting with nitrogen fixation-related genes, showing its essential role in biological nitrogen fixation. Furthermore, overexpression of sSp_p6 can increase lateral root formation in the host plant Sorghum, leading to improved plant root morphology.
Article
Plant Sciences
Samuel T. Wilson, Mathieu Caffin, Angelicque E. White, David M. Karl, B. Palenik
Summary: The study investigates the effect of different gas conditions on hydrogen production by cyanobacteria, highlighting the potential of the argon-induced hydrogen production method in evaluating nitrogenase activity. Additionally, comparison of hydrogen production under air and argon gas conditions revealed the efficiency of electron usage during nitrogen fixation process.
JOURNAL OF PHYCOLOGY
(2021)
Article
Microbiology
Ugo Marzocchi, Stefano Bonaglia, Anastasija Zaiko, Grazia M. Quero, Irma Vybernaite-Lubiene, Tobia Politi, Aurelija Samuiloviene, Mindaugas Zilius, Marco Bartoli, Ulisse Cardini
Summary: The study reveals that zebra mussels significantly enhance nitrogen cycling to the water column in the shallow sediment of the lagoon through the release of ammonium and stimulation of DNRA, as well as exhibiting a unique N2 fixation capacity associated with the mussel's holobiont.
FRONTIERS IN MICROBIOLOGY
(2021)
Article
Agronomy
Lu Zhang, Xiangtao Wang, Jie Wang, Lirong Liao, Shilong Lei, Guobin Liu, Chao Zhang
Summary: The study found that as alpine meadows degrade, soil biological nitrogen fixation rate decreases significantly, accompanied by reduced abundance and diversity of diazotrophic microbes. Plant functional groups are the primary drivers of soil biological nitrogen fixation rates.
Article
Ecology
Erica A. H. Bakker, Carmella Vizza, Clay P. Arango, Sarah S. Roley
Summary: This study investigated the nitrogen fixation in low-N streams in the Cascade Mountains. It identified three dominant groups of nitrogen-fixing organisms and measured their nitrogen fixation rates using acetylene reduction assay and N-15(2) calibration. The study found that sediment heterotrophs and cyanobacteria colonies contributed significantly to stream nitrogen availability.
FRESHWATER BIOLOGY
(2022)
Article
Microbiology
Kathleen M. Morrow, M. Sabrina Pankey, Michael P. Lesser
Summary: The microbiome composition and diazotrophic community of corals are influenced by biogeography, coral traits, and ecological life history characteristics, with coral morphology being a significant factor. Different host species have a significant impact on the composition and diversity of the microbiome, especially on the diazotrophic community.
Article
Ecology
Francisco M. Cornejo-Castillo, Jonathan P. Zehr
Summary: Gamma-A, a widely distributed non-cyanobacterial diazotroph, was found to be present and active in different size fractions of plankton through marine metagenomic and metatranscriptomic studies, indicating its potential for nitrogen fixation.
Article
Engineering, Environmental
Romain Darnajoux, Robert Bradley, Jean-Philippe Bellenger
Summary: This study characterizes the in vivo effect of temperature on the activities of Mo nitrogenase and V nitrogenase. It demonstrates that V nitrogenase becomes as efficient as Mo nitrogenase at temperatures below 10-15 degrees C. The availability of oxygen limits the activity of both enzymes at temperatures above 22 degrees C.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Environmental Sciences
Junpeng Rui, Jingjing Hu, Fuxin Wang, Yuwei Zhao, Chao Li
Summary: Non-symbiotic diazotrophs play important roles in nitrogen fixation in alpine meadow soils on the Tibetan Plateau, with soil moisture and temperature being key factors driving the diazotrophic community structures.
ENVIRONMENTAL RESEARCH
(2022)
Article
Chemistry, Inorganic & Nuclear
Bo Wang, Chao Yan, Guangqing Xu, Xia Shu, Jun Lv, Jiewu Cui, Dongbo Yu, Zhiyong Bao, Yucheng Wu
Summary: A FeS2 coupled MoS2 heterostructure was designed for ammonia synthesis under ambient conditions. The optimized nanocomposite showed high ammonia yield rate and good stability.
DALTON TRANSACTIONS
(2022)
Article
Ecology
Jesmi Yousuf, Jabir Thajudeen, P. A. Aneesa, Ajith Joseph, P. S. Divya, Abin Varghese, Mohamed A. A. Hatha
REGIONAL STUDIES IN MARINE SCIENCE
(2020)
Article
Ecology
P. V. Vipindas, R. K. M. Mujeeb, T. Jabir, T. R. Thasneem, A. A. Mohamed Hatha
REGIONAL STUDIES IN MARINE SCIENCE
(2020)
Article
Food Science & Technology
Puthenkandathil Sukumaran Divya, Jabir Thajudeen, Jesmi Yousuf, Anand Madavan, Mohamed Hatha Abdulla
JOURNAL OF FOOD PROCESSING AND PRESERVATION
(2020)
Article
Ecology
Panakkool Thamban Aneesh, Niel L. Bruce, Musaliyarakam Nashad, Kinattumkara Bineesh, Abdulla A. Mohamed Hatha
MARINE BIOLOGY RESEARCH
(2020)
Article
Chemistry, Analytical
Rekha Mol Kollakalnaduvil Raghavan, Manzur Ali Pannippara, Sapna Kesav, Abraham Mathew, Sarita G. Bhat, Mohamed A. A. Hatha, K. K. Elyas
Summary: The extracellular thermostable antibacterial peptide MFAP9 was purified from marine Aspergillus fumigatus BTMF9, demonstrating strong antibacterial activity and antibiofilm effect against various bacteria. It showed no toxicity to human red blood cells, indicating its potential as a novel anti-infective agent.
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
(2021)
Article
Biotechnology & Applied Microbiology
T. Jabir, P. V. Vipindas, K. P. Krishnan, A. A. Mohamed Hatha
Summary: This study investigated the abundance and diversity of diazotrophs in Arctic fjord sediments, revealing dominance of δ-proteobacterial diazotrophs and significant correlations with TOC/TN ratio and total organic carbon content. Glacier runoff introducing low nitrogen content organic matter enhances the abundance and diversity of nitrogen-fixing microorganisms in the fjord sediments.
WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
(2021)
Article
Environmental Sciences
T. Jabir, P. V. Vipindas, Y. Jesmi, P. S. Divya, B. M. Adarsh, H. S. Nafeesathul Miziriya, A. A. Mohamed Hatha
Summary: Benthic nitrogen fixation in tropical estuaries, particularly during the post-monsoon period, plays a significant role in the marine nitrogen cycle. Sulfur reducing bacterial phylotypes are major diazotrophs contributing to nitrogen fixation in these systems.
MARINE POLLUTION BULLETIN
(2021)
Article
Ecology
Ally C. Antony, Reshma Silvester, P. S. Divya, P. A. Aneesa, Bini Francis, Ajith C. Joseph, Midhun Shah Hussain, B. T. Umesh, Joy George, Mohamed Hatha Abdulla
Summary: The study evaluated the seasonal prevalence of faecal coliforms in Indian black clam, sediment and harvesting waters along the Cochin estuary. E. coli strains were isolated and identified, with a high prevalence during monsoon and post-monsoon seasons. Pathogenic serotypes were present in the isolates, highlighting potential health hazards to consumers.
REGIONAL STUDIES IN MARINE SCIENCE
(2021)
Article
Biotechnology & Applied Microbiology
S. Vishnupriya, T. Jabir, K. P. Krishnan, A. A. Mohamed Hatha
Summary: Kongsfjorden, an Arctic fjord, is experiencing changes in bacterial community structure of sediments due to glacier melt and Atlantification driven by accelerated warming in the Arctic. The dominant phyla in the sediments are Proteobacteria, Bacteroidetes, and Epsilonbacteraeota, with alpha- and gamma-Proteobacteria class dominating in surface sediments and delta-Proteobacteria in subsurface sediments. Total organic carbon is suggested to be a major factor affecting bacterial diversity, and bacterial communities are predicted to be involved in the degradation of complex organic compounds and biosynthesis of secondary metabolites.
WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
(2021)
Article
Ecology
A. A. Mohamed Hatha, T. Jabir, E. Akhil Prakash, K. P. Krishnan
Summary: Microcosm experiments were conducted to study the relative survival of two Escherichia coli strains in the Kongsfjorden water during the 2017 Arctic summer. Biotic factors and solar radiation were found to be most effective in removing E. coli from the water, while the chemical composition of the fjord water supported extended survival of the bacteria.
Article
Ecology
Preetha Gopalakrishnan Nair, Shoji Joseph, Narayana Pillai, Mohamed Hatha Ammanaveetil Abdulla
Summary: This study examines the relationship between recurrent Potential Fishing Zones (PFZ) and seasonal hydrographic conditions along the Southwest coast of India. The findings suggest that the frequency and location of repeat PFZs are influenced by the region's predominant hydrographic settings, particularly during the Northeast Monsoon season.
REGIONAL STUDIES IN MARINE SCIENCE
(2022)
Review
Environmental Sciences
Jasna Vijayan, Vinod Kumar Nathan, Parvathi Ammini, Abdulla Mohamed Hatha Ammanamveetil
Summary: Microbial analysis is crucial in aquatic ecology for assessing the role of microbes in food web dynamics and biogeochemical processes. Traditional methods like microscopy and culture-based analysis have been gradually replaced by molecular techniques, especially metagenomics analysis which allows the identification and characterization of microorganisms and their functionality. This review focuses on the metagenomics analysis of bacterial diversity in various aquatic systems in India.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Fisheries
Ally C. Antony, Reshma Silvester, P. A. Aneesa, Bini Francis, Mohamed Hatha Abdulla
Summary: The study evaluated the efficacy of a closed water depuration system for Indian black clams, showing complete removal of fecal coliforms and fecal streptococci within 48 hours, but total coliforms were not fully depurated even after 96 hours. The system uses simple, cost-effective, natural, and renewable water treating agent such as coconut shell-based activated carbon and is suitable for household purposes.
FISHERY TECHNOLOGY
(2021)
