Polychlorinated biphenyls (PCBs) and organochloride pesticides (OCPs) in sediment from the Beibu Gulf, China: Occurrence, spatial-temporal distribution, source, historical variation and ecological risks.

This study comprehensively analyzed 11 polychlorinated biphenyls (PCBs) and 16 organochlorine pesticides (OCPs) in 87 surface sediment samples collected across two seasons and in a sediment core from the Beibu Gulf, China. Overall, only a limited number and low concentrations of PCBs and OCPs were detected. In surface sediments, ΣPCBs concentrations were higher in summer (mean: 0.

A portable biosensor based on exonuclease III-assisted amplification strategy for on-site monitoring and early warning of Phaeocystis globosa bloom.

In recent years, the frequent outbreaks of Phaeocystis globosa (P. globosa) bloom have seriously threatened the safety of coastal nuclear power. However, existing detection technologies cannot meet the demand for the early warning of P.

Assessment of hazardous microplastic polymers and phthalic acid esters in an invasive mollusk (Mytella strigata) from the Cochin estuary, southwest coast of India: Unraveling ecosystem risks.

This paper characterizes the abundance, chemical characteristics, and potential hazards of microplastics (MPs) in water, sediment, and Mytella strigata from the Cochin Estuary (CE). In parallel, concentrations of plastic additives such as PAEs were measured in M. strigata to explore a possible relationship with MP contamination levels.

sp. nov., a methanogen isolated from potential methane hydrate bearing area offshore southwestern Taiwan.

A novel mesophilic, hydrogenotrophic methanogen, strain CWC-01, was isolated from the sediment sample of the piston core collected at station 3 at Good Weather Ridge area offshore southwestern Taiwan from ORI-902A cruise in 2009. Cells of strain CWC-01 are rod-shaped, measuring 0.4-0.

A novel roseosiphovirus infecting dinoroseobacter shibae DFL12 represents a new genus.

Bacteria belonging to the Roseobacter clade are key players in marine ecosystems, contributing significantly to carbon and sulfur cycles. Marine viruses, particularly those targeting Roseobacter, play crucial roles in regulating microbial communities and biogeochemical processes. Despite their importance, phages infecting organisms of the Roseobacter clade remain poorly understood.

A novel separated OPECT aptasensor based on MOF-derived BiVO/BiS type-II heterojunction for rapid detection of bacterial quorum sensing signal molecules.

Quorum sensing signal molecules released by microorganisms serve as critical biomarkers regulating the attachment and aggregation of marine microbes on engineered surfaces. Hence, the development of efficient and convenient methods for detecting quorum sensing signal molecules is crucial for monitoring and controlling the formation and development of marine biofouling. Advanced optoelectronic technologies offer increased opportunities and methods for detecting quorum sensing signal molecules, thereby enhancing the accuracy and efficiency of detection.

Nanozyme-based dual-mode DNA biosensor for self-powered ultrasensitive detection of sulfate-reducing bacteria.

Sulfate-reducing bacteria (SRB) are recognized as significant contributors to microbiologically induced corrosion (MIC). Developing effective, economical, sensitive, and specific detection methods for SRB is crucial for understanding microbial corrosion mechanisms and for early monitoring. In this study, a novel dual-mode DNA biosensor was developed, utilizing a nanozyme-based fuel cell to enable self-powered detection of the DsrA gene in SRB, while demonstrating excellent sensitivity, specificity, and reliability.

Stress Response of the Juvenile Tri-Spine Horseshoe Crab Tachypleus tridentatus to Hypoxia: Insights From Phenotypic, Metabolomic, and Microbial Analyses.

Over the past few decades, ocean hypoxia has been increasing due to human activities. Hypoxic stress, characterized by a reduced level of dissolved oxygen, is an escalating threat to marine ecosystems, with potentially devastating effects on the viability of endangered species such as the tri-spine horseshoe crab Tachypleus tridentatus. Even though this species is remarkably resilient to low oxygen levels, persistent hypoxia can negatively impact its population's survivability.

Preparation and anti-inflammation activity of λ-carrageenan oligosaccharides degraded by a novel λ-carrageenase Car3193.

To date, less attention has been paid to λ-carrageenases and their enzymatic hydrolysates than to κ- and ι-carrageenases and their hydrolysates. In this study, a Gram-negative strain Polaribacter sp. NJDZ03 was isolated from the surface of an Antarctic macroalga, Desmarestia sp.

How Does Mangrove Restoration or Reforestation Change Trace Metal Pollution in Mangrove Ecosystems? A Review of Current Knowledge.

In recent years, mangrove restoration has gained significant attention due to its carbon storage capacity, role as a pollution sink, and ecological and economic benefits. Moreover, the United Nations Sustainable Development Goals' strategies include mangrove restoration. This review investigates the status of mangrove restoration research and the influence of restoration on trace metal accumulation, speciation, and associated risks in mangrove sediments.

Agarase cocktail from agarolytic Alteromonas sp. Aga1552 converts homogenized Gelidium amansii into monosaccharide.

Marine algae biomass utilization has attracted considerable attention, however, the preparation of monosaccharides from raw algae is still hindered by many technical barriers. In this study, three genes, aga1365, aga1364, and aga1360, encoding key enzymes constituting a complete agar decomposition pathway were expressed and characterized. Recombinant Aga1365, Aga1364, and Aga1360 exhibited high optimal reaction temperatures and excellent thermal stability.

CO enrichment and excess nitrogen supply synergistically increase toxicity of marine dinoflagellate Alexandrium minutum.

Discharges of CO and nutrients by anthropogenic activities have notable contributions to CO enrichment and eutrophication in coastal systems. Following our previous study that toxic dinoflagellate Alexandrium minutum will increase their growth rate and cellular toxicity under elevated levels of CO, we further examined the joint effects of CO enrichment and excess nitrogen supply through a 29-day experiment under three CO levels (400, 800 and 1200 ppm) with a high N/P ratio of 80. It was found that the two factors have synergistical effects in promoting the increase of cellular toxicity.

Analysis of PAHs content, source and risk assessment in surface sediments from Laizhou Bay and Bohai Bay.

To understand the levels of PAHs and ecological risks to the marine environment in Laizhou Bay and Bohai Bay, 33 sediment samples were collected in the region for analysis. PAH concentrations ranged from 98.22 ng·g (dw) to 239.

Ultrasensitive on-site colorimetric detection of Campylobacter in oyster with a portable biosensing platform based on hydroxamate/Fe-violurate chromogenic reaction and smartphone.

The contamination of Campylobacter in shellfish poses a health risk for its pathogenicity associated with campylobacteriosis. However, an efficient method to detect this risk is unavailable. Herein, we introduce a portable colorimetric biosensing platform that comprises three modules: an enrichment module 1, a binding and transduction module 2, and a smartphone-based module 3.

Occurrence status, source analysis and risk assessment of polycyclic aromatic hydrocarbons in intertidal surface sediments of typical mangrove wetlands in Guangxi Province, China.

This study investigated the occurrence status, sources, and risk assessment of polycyclic aromatic hydrocarbons (PAHs) in sediments from three typical mangrove areas in Guangxi Province, China. Results showed that the PAH content in the three studied regions ranged from 39.76 ng·g to 164.

Fate and mass budget of microplastic in the Beibu Gulf, the northern South China sea.

This study investigated the distribution, abundance, and mass budget of microplastics (MPs) in the Beibu Gulf, Northern South China Sea, focusing on their ecological significance and anthropogenic influence. Microplastics were found in all water and sediment samples, with concentrations in surface water ranging from 0.10 to 0.

Abundance of microplastics and its ecological risk assessment in coral reef regions of Peninsular Malaysia.

Microplastic contamination is an emerging concern in marine ecosystems, with limited knowledge on its impact on coral reefs, particularly in Malaysia. Surface waters were collected from several coral reef regions in Peninsular Malaysia by towing a plankton net behind the boat. Microplastics were detected at all sites, with a mean abundance of 0.

Influence of Oxygen Exposure on Lignin Preservation during Sediment Lateral Transport in the Ocean: Insights from Molecular Dynamics Simulations.

Understanding the fate of terrestrial organic carbon (terrOC) preservation in the marine environments is critical for deciphering the biogeochemical processes associated with the global carbon cycle and the Earth's climate change. The mechanisms controlling terrOC preservation are not completely understood, while lateral oxygen exposure time (OET) is considered as a critical controlling factor. Here, we first utilized molecular dynamics simulations to investigate the structural properties of lignin under anoxic, suboxic, and oxic conditions for understanding the mechanisms of terrOC preservation during sediment lateral transport in the ocean.

Occurrence, Source Apportionment, and Risk Assessment of Antibiotics in Mangrove Sediments from the Lianzhou Bay, China.

In recent years, the widespread application of antibiotics has raised global concerns, posing a severe threat to ecological health. In this study, the occurrence, source, and ecological risks of 39 antibiotics belonging to 5 classes in mangrove sediments from Lianzhou Bay, China, were assessed. The total concentrations of the antibiotics (∑39 antibiotics) ranged from 65.

Distribution characteristics, source analysis and ecological risk assessment of polycyclic aromatic hydrocarbons in surface sediments from the western Honghai Bay of China.

The distribution characteristics and risk levels of PAHs in surface sediment in the Honghai Bay of China are studied in this paper. The results showed that the concentration of total PAHs in this area ranged from 100.65 ng·g to 241.

O-rich γ-MnO enhanced electrocatalytic three-electron oxygen reduction to hydroxyl radicals for sterilization in neutral media.

Marine biofouling severely limits the development of the marine economy, and reactive oxygen species (ROS) produced by electrocatalytic antifouling techniques could inactivate marine microorganisms and inhibit the formation of marine biofouling. Compared with an electro-Fenton reaction, a three-electron oxygen reduction reaction (3e ORR) could generate a hydroxyl radical (˙OH) without the limitation of pH and iron mud pollutants. Herein, O-rich γ-MnO is designed to enhance the 3e ORR performance in neutral media and exhibits excellent sterilization performance for typical marine bacteria.