Enhancing vector control: AI-based identification and counting of Aedes albopictus (Diptera: Culicidae) mosquito eggs.

Background: Dengue fever poses a significant global public health concern, necessitating the monitoring of Aedes mosquito population density. These mosquitoes serve as the disease vectors, making their surveillance crucial for dengue prevention. The objective of this study was to address the difficulty associated with identifying and counting mosquito eggs of wild strains during the monitoring of Aedes albopictus (Diptera: Culicidae) density via ovitraps in field surveys.

Efficient smart-phone luminescent sensing detection based on new multifunctional Cd(II) luminescent coordination polymers.

Based on the mixed ligand strategy, two new isostructural Cd coordination polymers: {[Cd(tcpa)(bima)(DMF)]‧3DMF} (CP 1), {[Cd(tcpa)(bmima)(DMF)]‧3DMF} (CP 2) were synthesized by combining two flexible anthracene-based and a triphenylamine-based ligands with large π-electron-rich structure using a solvothermal method (Htcpa = tris(4-carboxyphenyl)amine; bima = 9,10-bis(1H-imidazole-1-yl)methyl)anthracene and bmima = 9,10-bis((2-methyl-1H-imidazol-1-yl)methyl)anthracene). CP 1 and CP 2 show an unreported new 3D (3,14)-c net structure with the {4·6·8}{4} topology. Both CPs could detect CrO, Nitroaromatic explosives 2,4,6-Trinitrophenol (TNP) and 2,4-dinitrophenol (DNP) through rapid fluorescence quenching response with high quenching efficiency Ksv and low LOD with 0.

Multiresponsive luminescent sensors for antibiotics and Cr with two luminescent Zn/Cd coordination complexes.

Two new Zn/Cd luminescent coordination polymers (CPs) based on the V-shaped bis(imidazole) ligand 3,6-bis (1H-benzo[d]imidazol-1-yl)-9-methyl-9H-carbazole (bbimc) with [1,1'-biphenyl]-4,4'-dicarboxylic acid ligand (Hbpdc) have been synthesized under solvothermal conditions: {[Zn(bbimc)(bpdc)]·DMF·2.5HO} (CP 1), {[Cd(bbimc)(bpdc)]·2DMF} (CP 2). CP 1 and CP 2 both display a uninodal 4-c unimodal sql topology 2D framework with vertex symbols of {4·6}.

A water stable and highly fluorescent Zn(II) based metal-organic framework for fast detection of Hg, Cr, and antibiotics.

The development of luminescent metal-organic frameworks for effective sensing and monitoring of environmental pollutants is of great significance for human health and environmental protection. In this work, a novel water-stable Zn-based luminescent coordination polymer, namely {[Zn(BBDF)(ATP)]·2DMF·3HO} ((BBDF = 2,7-bis(1-benzimidazol-1-yl)-9,9-dimethyl-9-fluorene) and HATP = 2-aminoterephthalic acid), was designed and obtained using the mixed-ligand method. Structural analysis indicated that 1 presents a two-fold interpenetrated two-dimensional layer structure with one dimensional (1D) channels along the axis.

Isolation and Characterization of Antibacterial Carotane Sesquiterpenes from Associated Endophytic QA-8.

Carotane sesquiterpenes are commonly found in plants but are infrequently reported in the fungal kingdom. Chemical investigation of QA-8, an endophytic fungus associated with the inner root tissue of the grown medicinal herb H. Lév.

Synthesis and photophysical properties of ditrifluoroacetoxyboron complexes with curcumin analogues.

A new class of ditrifluoroacetoxyboron complexes were designed and synthesized by chelation reaction of curcumins with boron trifluoroacetate. Their photophysical behaviors were studied in different solvents, powder state and PMMA polymer films. The results indicated that these complexes revealed a green to yellow emission at 486-595 nm in solution or PMMA films and an orange to red emission at 598-710 nm in powder state.

Polyketides and Terpenoids with Potent Antibacterial Activities from the Artemisia argyi-Derived Fungus Trichoderma koningiopsis QA-3.

The AcOEt extract of Artemisia argyi-derived fungus Trichoderma koningiopsis QA-3 showed potent inhibitory activity against pathogenic bacteria. Fractionation of the extract resulted in the isolation of three new polyketides (1-3) and two new terpenoids (4 and 5), together with three known metabolites (6-8). Their chemical structures were analyzed by NMR spectra, ECD, HR-ESI-MS or HR-EI-MS, optical rotation, and X-ray crystallographic data, as well as by comparison with literature reports.

Highly oxygenated polyketides produced by Trichoderma koningiopsis QA-3, an endophytic fungus obtained from the fresh roots of the medicinal plant Artemisia argyi.

Eight new highly oxygenated fungal polyketides, namely, 15-hydroxy-1,4,5,6-tetra-epi-koninginin G (1), 14-hydroxykoninginin E (2), koninginin U (3), 4'-hydroxykoninginin U (4), koninginin V (5), 14-ketokoninginin B (6), 14-hydroxykoninginin B (7), and 7-O-methylkoninginin B (8), together with six known related analogues (9-14), were isolated from Trichoderma koningiopsis QA-3, a fungus obtained from the inner root tissue of the well known medicinal plant Artemisia argyi. All these compounds are bicyclic polyketides, with compound 1 contains unusual hemiketal moiety at C-5 and compounds 2-14 having ketone group at C-1 and double bond at C-5(6). The structures and absolute configurations of the new compounds were established by spectroscopic analysis, X-ray crystal diffraction, modified Mosher's method, and ECD calculation.

Protection of Taurine Against Neurotoxicity Induced by Arsenic in Primary Cortical Neurons.

Our group previously reported that taurine has a protective capacity on the hippocampus and cerebellum of arsenic (As)-exposed mouse. In the present study, we explore whether taurine demonstrates protection against As toxicity in primary cortical neurons. Primary cortical neurons were exposed to various concentrations of arsenite and cell viability was assessed to confirm the toxicity of As on cortical neurons.

Taurine Protects Against Arsenic-Induced Apoptosis Via PI3K/Akt Pathway in Primary Cortical Neurons.

Arsenate, a well known toxicant, can induce injury in nerve system via oxidative stress and apoptosis. This study was designed to explore the protective effect of taurine against arsenite-induced neurotoxicity and its related mechanism in primary cortical neurons. The cells were treated with arsenite with or without taurine.

Trichocadinins B-G: Antimicrobial Cadinane Sesquiterpenes from QA-8, an Endophytic Fungus Obtained from the Medicinal Plant .

Trichocadinins B-G (-), six new cadinane-type sesquiterpene derivatives, each with C-14 carboxyl functionality, were isolated from the culture extract of QA-8, an endophytic fungus obtained from the fresh inner tissue of the medicinal plant . Their structures were elucidated by interpretation of the NMR spectroscopic and mass spectrometric data. The structures and absolute configurations of compounds and were confirmed by X-ray crystallographic analysis.

Synthesis, photophysical and solvatochromic properties of diacetoxyboron complexes with curcumin derivatives.

Five novel diacetoxyboron complexes of β-diketones incorporated curcumin moiety were designed and synthesized. Their photophysical behaviors were investigated by UV-vis absorption and fluorescence spectroscopy in different solvents and solid state. It was observed that their fluorescence spectra yielded a blue to yellow-green emission in solution and emitted a yellow to red emission in solid state.

Preparation and photophysical properties of thienothiophene functionalized difluoroboron bis-β-diketonate complexes.

A series of six new thienothiophene functionalized difluoroboron bis-β-diketonates were synthesized and characterized. Their photophysical properties were investigated by UV-vis absorption, fluorescence spectroscopy and the method of CIE chromaticity in solution and powders. The results showed that these difluoroboron complexes yielded a blue-green emission at 474-500 nm in DMF solution and emitted a green to yellow emission at 541-587 nm in powders.

Bone marrow mesenchymal stem cells protect against n-hexane-induced neuropathy through beclin 1-independent inhibition of autophagy.

Chronic exposure to n-hexane, a widely used organic solvent in industry, induces central-peripheral neuropathy, which is mediated by its active metabolite, 2,5-hexanedione (HD). We recently reported that transplantation of bone marrow-mesenchymal stem cells (BMSC) significantly ameliorated HD-induced neuronal damage and motor deficits in rats. However, the mechanisms remain unclear.

Inhibition of miR-219 Alleviates Arsenic-Induced Learning and Memory Impairments and Synaptic Damage Through Up-regulating CaMKII in the Hippocampus.

Epidemiological investigations and experimental studies indicate that chronic arsenic exposure can reduce learning and memory function. However, the underlying mechanism of this effect remains largely unknown. Emerging evidence suggests that microRNA (miRNA) play an important role in toxicant exposure and a regulatory role in cognitive function.

Protection of Taurine Against Arsenic-Induced DNA Damage of Mice Kidneys.

The purpose of this study was to explore the protective capacity of taurine on arsenic (As)-induced neurotoxicity. Thirty mice were used and ten rats in each group. We treated the As exposure group with 4 ppm AsO for 60 days by drinking water and the protective group with 4 ppm AsO and 150 mg/kg taurine.

A highly sensitive fluorescent chemosensor for selective detection of zinc (II) ion based on the oxadiazole derivative.

A novel fluorescent chemosensor based on the oxadiazole, 2-(2-hydroxyphenyl)-5-(4-methoxyphenyl)-1,3,4-oxadiazole, was designed and synthesized. The interaction of the oxadiazole with different metal ions had been investigated through UV-vis absorption and fluorescence spectra in 9:1 (v/v) ethanol-water (pH=7.0) solution.

Synthesis of Pyrido-Fused Quinazolinone Derivatives via Copper-Catalyzed Domino Reaction.

A simple and efficient synthesis of 11H-pyrido[2,1-b]quinazolin-11-ones by Cu(OAc)2·H2O-catalyzed reaction of easily available substituted isatins and 2-bromopyridine derivatives has been developed. The reaction involves C-N/C-C bond cleavage and two C-N bond formations in a one-pot operation. This methodology is complementary to previously reported synthetic procedures, and two plausible reaction mechanisms are discussed.

Fluorescence quenching study of 2,6-bis(5-(4-methylphenyl)-1-H-pyrazol-3-yl)pyridine with metal ions.

A novel bispyrazole derivative 2,6-bis(5-(4-methylphenyl)-1-H-pyrazol-3-yl)pyridine was synthesized and its structure was confirmed by (1)H NMR, FTIR, MS techniques and elemental analysis. The binding interactions of BMPP with Cd(2+), Co(2+), Pb(2+) and Cu(2+) ions were investigated in MeOH-H2O solution by fluorescence quenching technique at two temperatures (25 and 35°C). Their quenching constants KSV, binding constants K, binding sites n and thermodynamic parameters (ΔH, ΔG and ΔS) were determined.

Synthesis and spectroscopic properties of some new difluoroboron bis-β-diketonate derivatives.

Six new bis-β-diketones (RCOCH2CO-C7H7N-COCH2COR) were synthesized from 3,5-diacetyl-2,6-dimethylpyridine via Claisen condensation with the corresponding esters, and then reacted with boron trifluoride etherate to afford difluoroboron bis-β-diketonate derivatives. Their spectroscopic properties were investigated by UV-vis, FTIR, (1)H NMR and fluorescence spectroscopic techniques. It was found that these boron complexes exhibited violet or blue fluorescence emission at 422-445nm and possessed high extinction coefficients.

Photoluminescence behavior of europium (III) complexes containing 1-(4-tert-butylphenyl)-3-(2-naphthyl)-propane-1,3-dione ligand.

Three novel europium complexes with 1-(4-tert-butylphenyl)-3-(2-naphthyl)-propane-1,3-dione (TNPD) and 2,2-dipyridine (Bipy) or 1,10-phenan-throline (Phen) were synthesized and confirmed by FT-IR, (1)H NMR, UV-vis absorption and elemental analysis. Photoluminescence behavior of complexes Eu(TNPD)3, Eu(TNPD)3·Bipy and Eu(TNPD)3·Phen were investigated in detail. Their emission spectra exhibited the characteristic emission bands that arise from the (5)D0→(7)FJ (J=0-4) transitions of the europium ion in solid state.

Synthesis, characterization and fluorescence properties of boron difluoride pyridyl-β-diketonate derivatives.

Five pyridyl-β-diketones were synthesized by Claisen condensation of ethyl nicotinate with various aryl methyl ketones in benzene in the presence of sodium amide as the base, and then reacted with boron trifluoride diethyl etherate in dichloromethane to afford some new boron difluoride pyridyl-β-diketonate derivatives. The compounds obtained were characterized using FTIR, (1)H NMR, elemental analysis and mass spectrometry. Their optical properties were studied in DMF by UV-vis absorption and fluorescence spectroscopy.

1-(4-Fluoro-phen-yl)-3-hydr-oxy-3-phenyl-prop-2-en-1-one.

In the crystal structure the title compound, C(15)H(11)FO(2), the molecule exists in the enol form. It is stabilized by an intra-molecular O-H⋯O hydrogen bond, in which the donor O-H and acceptor H⋯O distances are almost equal. The dihedral angle between the two benzene rings is 22.

3-(4-Biphenyl-1-yl)-3-hydr-oxy-1-phenyl-prop-2-en-1-one.

In the title compound, C(21)H(16)O(2), the six crystallographically independent mol-ecules (Z' = 6) all exist in the enolized form. Strong intra-molecular hydrogen bonds are observed: one approximate H-atom-centered O⋯H⋯O hydrogen bond, two tautomeric forms O-H⋯O (three mol-ecules) and O⋯H-O (two mol-ecules). Only one weak inter-molecular C-H⋯O hydrogen bond between two neighboring mol-ecules is observed in the crystal structure.