Degradation and/or Dissociation of Neurodegenerative Disease-Related Factor Amyloid-β by a Suspension Containing Calcium Hydrogen Carbonate Mesoscopic Crystals.

Amyloid-β (Aβ) aggregates accumulate in the brains of individuals with Alzheimer's disease and are thought to potentially act as prions, promoting further aggregation. Consequently, the biochemistry of Aβ has emerged as a promising target for Alzheimer's disease. CAC-717, a suspension of calcium bicarbonate mesoscopic structures derived from natural sources, has been shown to inactivate various pathogens, including prions.

Green manure () cover promotes tea plant growth by regulating soil carbon cycling.

Introduction: In mountainous tea plantations, which are the primary mode of tea cultivation in China, issues such as soil erosion and declining soil fertility are particularly severe. Although green manure cover is an effective agricultural measure for restoring soil fertility, its application in mountainous tea plantations has been relatively understudied.

Methods: This study investigated the effects of continuous green manure cover using the slope-protecting plant on tea plant growth and soil microbial community structure.

Toxicity of antimony to plants: Effects on metabolism of N and S in a rice plant.

Excess antimony (Sb) has been shown to damage plant growth. Rice plants readily absorb a large amount of Sb after a long period of flooding, yet the mechanisms underlying Sb toxicity in plants have not been solved. This study was conducted to explore the effects of Sb on the uptake of N and S, and monitor the concentrations of reduced glutathione (GSH) and enzymes associated with these processes.

A Sb(III)-specific efflux transporter from Ensifer adhaerens E-60.

Antimony is pervasive environmental toxic substance, and numerous genes encoding mechanisms to resist, transform and extrude the toxic metalloid antimony have been discovered in various microorganisms. Here we identified a major facilitator superfamily (MFS) transporter, AntB, on the chromosome of the arsenite-oxidizing bacterium Ensifer adhaerens E-60 that confers resistance to Sb(III) and Sb(V). The antB gene is adjacent to gene encoding a LysR family transcriptional regulator termed LysR, which is an As(III)/Sb(III)-responsive transcriptional repressor that is predicted to control expression of antB.

Pesticides in the environment: Degradation routes, pesticide transformation products and ecotoxicological considerations.

Among rising environmental concerns, emerging contaminants constitute a variety of different chemicals and biological agents. The composition, residence time in environmental media, chemical interactions, and toxicity of emerging contaminants are not fully known, and hence, their regulation becomes problematic. Some of the important groups of emerging contaminants are pesticides and pesticide transformation products (PTPs), which present a considerable obstacle to maintaining and preserving ecosystem health.

Biosynthesis of silver nanoparticles using Burkholderia contaminans ZCC and mechanistic analysis at the proteome level.

The biogenic synthesis of silver nanoparticles (AgNPs) by microorganisms has been a subject of increasing attention. Despite extensive studies on this biosynthetic pathway, the mechanisms underlying the involvement of proteins and enzymes in AgNPs production have not been fully explored. Herein, we reported that Burkholderia contaminans ZCC was able to reduce Ag to AgNPs with a diameter of (10±5) nm inside the cell.

Microeukaryotic plankton evolutionary constraints in a subtropical river explained by environment and bacteria along differing taxonomic resolutions.

Microeukaryotic plankton communities are keystone components for keeping aquatic primary productivity. Currently, variations in microeukaryotic plankton diversity have often been explained by local ecological factors but not by evolutionary constraints. We used amplicon sequencing of 100 water samples across five years to investigate the ecological preferences of the microeukaryotic plankton community in a subtropical riverine ecosystem.

Transposable elements impact the population divergence of rice blast fungus .

Unlabelled: Dynamic transposition of transposable elements (TEs) in fungal pathogens has significant impact on genome stability, gene expression, and virulence to the host. In , genome plasticity resulting from TE insertion is a major driving force leading to the rapid evolution and diversification of this fungus. Despite their importance in population evolution and divergence, our understanding of TEs in this context remains limited.

Nanomaterials and biochar mediated remediation of emerging contaminants.

The unrestricted release of various toxic substances into the environment is a critical global issue, gaining increased attention in modern society. Many of these substances are pristine to various environmental compartments known as contaminants/emerging contaminants (ECs). Nanoparticles and emerging sorbents enhanced remediation is a compelling methodology exhibiting great potential in addressing EC-related issues and facilitating their elimination from the environment, particularly those compounds that demonstrate eco-toxicity and pose considerable challenges in terms of removal.

A brief history of metal recruitment in protozoan predation.

Metals and metalloids are used as weapons for predatory feeding by unicellular eukaryotes on prokaryotes. This review emphasizes the role of metal(loid) bioavailability over the course of Earth's history, coupled with eukaryogenesis and the evolution of the mitochondrion to trace the emergence and use of the metal(loid) prey-killing phagosome as a feeding strategy. Members of the genera Acanthamoeba and Dictyostelium use metals such as zinc (Zn) and copper (Cu), and possibly metalloids, to kill their bacterial prey after phagocytosis.

Selenite reduced cadmium uptake, interfered signal transduction of endogenous phytohormones, and stimulated secretion of tartaric acid based on a combined analysis of non-invasive micro-test technique, transcriptome and metabolome.

Selenium (Se) can reduce uptake and translocation of cadmium (Cd) in plants via plenty of ways, including regulation of root morphology. However, the underlying mechanisms on how Se will regulate root morphology under metal(loid) stresses are not fully illustrated. To fill up this knowledge gap, we investigated the effects of 0.

Biogeochemical and microscopic studies of soil and Phragmites australis (Cav.) Trin. ex Steud. plants affected by coal mine dumps.

Developed areas of the coal industry are subjected to long-term anthropogenic impacts from the input and accumulation of overburdened coal material, containing potentially toxic heavy metals and metalloids (HMM). For the first time, comprehensive studies of soils and plants in the territory of the Donetsk coal basin were carried out using X-ray fluorescence, atomic absorption analysis, and electron microscopy. The observed changes in the soil redox conditions were characterized by a high sulfur content, and formations of new microphases of S-containing compounds: FeS, PbFe(SO)(OH), ZnSO·nHO, revealed the presence of technogenic salinization, increased С content, and low pH contents.

Adaptation to metal(loid)s in strain Mucilaginibacter rubeus P2 involves novel arsenic resistance genes and mechanisms.

Arsenic is a ubiquitous environmental toxi substance that affects human health. Compared to inorganic arsenicals, reduced organoarsenicals are more toxic, and some of them are recognized as antibiotics, such as methylarsenite [MAs(III)] and arsinothricin (2-amino-4-(hydroxymethylarsinoyl)butanoate, or AST). To date, organoarsenicals such as MAs(V) and roxarsone [Rox(V)] are still used in agriculture and animal husbandry.

Inhibition of continuous cropping obstacle of celery by chemically modified biochar: An efficient approach to decrease bioavailability of phenolic allelochemicals.

The accumulation of allelochemicals released by plants is commonly found in continuous monocropping systems. These chemicals, such as phenolic acids, were shown to be the major sources of autotoxin or pathogen accumulation in soils, leading to a direct or indirect continuous cropping obstacle. In this study, three types of agricultural residuals, i.

Complete genome sequence of P3, a heavy metal(loid)-resistant bacterium, isolated from a gold and copper mine.

P3, which was isolated from the sub-surface soil of the Zijin Gold and Copper Mine, displayed extremely high resistance to multiple heavy metal(loid)s and contained two novel operons. Complete genome sequencing of P3 yielded a single, closed genome of 7,187,928 bp, with GC content of 42.79%.

PtrA regulates prodigiosin synthesis and biological functions in FZSF02.

is a gram-negative bacterium that is able to produce many secondary metabolites, such as the prominent red pigment prodigiosin (PG). In this work, a -disrupted mutant strain with reduced PG production was selected from Tn transposon mutants. RT-qPCR results indicated that promoted elevated transcription of the gene cluster in FZSF02.

Antioxidant CeO doped with carbon dots enhance ammonia production by an electroactive Azospirillum humicireducens SgZ-5.

Microbial nitrogen fixation is a fundamental process in the nitrogen cycle, providing a continuous supply of biologically available nitrogen essential for life. In this study, we combined cerium oxide-doped carbon dots (CeO/CDs) with electroactive nitrogen-fixing bacterium Azospirillum humicireducens SgZ-5 to enhance nitrogen fixation through ammonium production. Our research demonstrates that treatment of SgZ-5 cells with CeO/CDs (0.

A new metabolic pathway for sym-homospermidine synthesis in an extreme thermophile, Thermus thermophilus.

In an extreme thermophile, Thermus thermophilus, sym-homospermidine is synthesized by the actions of two enzymes. The first enzyme coded by dhs gene (annotated to be deoxyhypusine synthase gene) catalyzes synthesis of an intermediate, supposed to be 1,9-bis(guanidino)-5-aza-nonane (=N, N-bis(amidino)-sym-homospermidine), from two molecules of agmatine in the presence of NAD. The second enzyme (aminopropylagmatinase) coded by speB gene catalyzes hydrolysis of the intermediate compound to sym-homospermidine releasing two molecules of urea.