Heterotrophic nitrification processes driven by glucose and sodium acetate: New insights into microbial communities, functional genes and nitrogen metabolism from metagenomics and metabolomics.

Heterotrophic nitrification (HN) bacteria use organic carbon sources to remove ammonia nitrogen (NH-N); however, the mechanisms of carbon and nitrogen metabolism are unknown. To understand this mechanism, HN functional microbial communities named MG and MA were enriched with glucose and sodium acetate, respectively. The NH-N removal efficiencies were 98.

Comparison of microbial communities in unleached and leached ionic rare earth mines.

The leaching of ionic rare earth elements has caused serious environmental pollution and ecological damage. Microorganisms play a crucial role in soil ecosystems and are one of the most important components of these systems. However, there are fewer studies related to the changes that occur in microbial community structure and diversity before and after leaching in ionic rare earth mines.

Metagenomic analysis revealed the evolution of microbial communities, metabolic pathways, and functional genes in the heterotrophic nitrification-aerobic denitrification process under La stress.

Trivalent lanthanum (La) exists widely in ammonia nitrogen (NH-N) tailing water from ionic rare earth mines; however, its effect on heterotrophic nitrification-aerobic denitrification (HN-AD) is unknown, thereby limiting the application of the HN-AD process in this field. In this study, we conducted an HN-AD process using a sequencing batch reactor (5 L) that was continuously operated to directly treat acidic (NH)SO wastewater (influent NH-N concentration of approximately 110 mg/L and influent pH of 5) containing different La concentrations (0-100 mg/L). The NH-N removal efficiency of the reactor reached 98.

Isolation and Nitrogen Removal Efficiency of the Heterotrophic Nitrifying-Aerobic Denitrifying Strain K17 From a Rare Earth Element Leaching Site.

K17, an indigenous and heterotrophic nitrifying-aerobic denitrifying bacterium, was isolated from the soil of a weathered crust elution-deposited rare earth ore leaching site in Longnan County, China. Strain K17 was identified as . In this study, the morphological characteristics of strain K17 were observed and the optimal ammonia nitrogen removal conditions for the strain were studied using a single-factor experiment.

Removal of ammonia nitrogen from residual ammonium leaching solution by heterotrophic nitrification-aerobic denitrification process.

The aftermath of mining weathered crust elution-deposited rare earth ore produces a large amount of residual ammonium leaching solution, which causes ammonia and nitrogen pollution to the mine site. Recently, denitrification by heterotrophic nitrification-aerobic denitrification (HN-AD) bacteria has attracted much attention. However, limited studies exist regarding the denitrification process of HN-AD bacteria.

Sensitive discrimination of single nucleotide variants using a PDA microtube waveguide platform with heterogeneous CHA amplification and competitive inhibition strategy.

Here, we present a novel PDA microtube waveguide platform by combining heterogeneous CHA amplification with competitive inhibition. The heterogeneous CHA amplification system can preferentially amplify the signal of the correct target, while the competitive inhibition system will preferentially bind with the mutant targets and inactivate their signal.

Author Correction: Dissymmetry enhancement in enantioselective synthesis of helical polydiacetylene by application of superchiral light.

The original version of the Article contained an error in Figure 2 in which the TEM images in Fig. 2b and d were incorrect. Additionally, the seventh sentence of the 'Mechanism for the dissymmetry enhancement of SCL field' section of the Methods originally contained a mistake in the first equation.

Chiral induction, modulation and locking in porphyrin based supramolecular assemblies with circularly polarized light.

Herein, we propose a novel circularly polarized light (CPL) triggered asymmetric self-assembly strategy to controllably construct chiral supramolecular assemblies from achiral porphyrin derivatives.

Enantioselective cytotoxicity of chiral polymer vesicles with linear and hyperbranched structures.

Herein, we study the enantioselective cytotoxicity of vesicles self-assembled by optically active linear polymers (LNPs) and hyperbranched polymers (HBPs). Compared to HBP vesicles, LNP vesicles exhibit properties such as a higher surface charge density and more violent interaction with simulated biomembranes which results in larger cytotoxicity against HeLa cells. Specifically, racemic-LNP vesicles exhibit the largest cytotoxicity of all.

Dissymmetry enhancement in enantioselective synthesis of helical polydiacetylene by application of superchiral light.

Superchiral light, generated by the interference of two counter-propagating circularly polarized light (CPL) with same frequency, opposite handedness and different intensity, exhibits enhanced dissymmetry in its interaction with chiral molecules, and has the potential for ultrasensitive detection and characterization of chiral molecules. It is anticipated that the enhanced optical dissymmetry in superchiral light (SCL) field may be utilized to promote asymmetric photochemical reactions efficiency. Herein we reported SCL impart greater chiral bias to trigger asymmetric photo-polymerization reaction from initially achiral diacetylene (DA) monomer, and the enhanced optical dissymmetry for whole polydiacetylene (PDA) films could be achieved.

Near-Infrared Circularly Polarized Light Triggered Enantioselective Photopolymerization by Using Upconversion Nanophosphors.

Circularly polarized light (CPL) is considered to be a true chiral entity and has been suggested as an explanation for the introduction of initial chiral biases into key biomolecular building blocks. CPL used recently asymmetric photochemical reactions is of wavelengths mainly in the UV and visible regions, whereas natural CPL observed in star-forming regions of the Orion constellation falls in the IR region. Whether CPL in the IR or near-IR region could be utilized to trigger asymmetric photochemical reactions remains to be determined.

2-Meth-oxy-ethanaminium periodate 18-crown-6 clathrate.

In the crystal structure of the title organic salt, C(3)H(10)NO(+)·IO(4) (-)·C(12)H(24)O(6), the protonated 2-meth-oxy-ethanaminium (CH(3)OC(2)H(4)-NH(3) (+)) cation forms a 1:1 supra-molecular rotator-stator complex with the 18-crown-6 mol-ecule via N-H⋯O hydrogen bonds. The (CH(3)OC(2)H(4)-NH(3) (+)) group is attached from the convex side of the bowl-shaped crown, in contrast to similar ammonium cations that nest in the curvature of the bowl. The cations are associated via N-H⋯O inter-actions, while the cations and anions are linked by weak C-H⋯O hydrogen bonds, forming cation-crown-anion chains parallel to [010].

Depolymerization of chitosan with a crude cellulase preparation from Aspergillus niger.

A crude cellulase preparation from Aspergillus niger was used to depolymerize chitosan. The depolymerization process was followed by measuring the apparent viscosity and the intrinsic viscosity. The optimum conditions for enzymatic hydrolysis were investigated.

Dichlorido{[2-(diphenyl-phosphino)phenyl-imino-meth-yl]ferrocene-κN,P}platinum(II) dichloro-methane hemisolvate.

In the title compound, [FePt(C(5)H(5))(C(24)H(19)NP)Cl(2)]·0.5CH(2)Cl(2), the Pt(II) atom adopts a distorted square-planar geometry defined by one P atom and one N atom from the bidentate [2-(diphenyl-phosphino)phenyl-imino-meth-yl]ferro-cene ligand and two Cl atoms. Two disordered dichloro-methane solvent mol-ecules are each 0.