查找使用阿拉丁产品的科研文献

In situ deep-sea surface-enhanced Raman scattering sensor reveals cyanide as a key factor in cold seep nitrogen cycling

Siyu Wang,Tingting Zhao,Wanying He,Fei Li,Zhicheng Wang,Ruhao Pan,Lianfu Li,Shichuan Xi,Zhendong Luan,Zhiyang Zhang,Bowei Li,Lingxin Chen,Xin Zhang

Deep-sea hydrothermal vents and cold seeps, typical ecosystems characterized by abundant carbon but limited nitrogen, support thriving microbial activities. The source of nitrogen has long been a key focus in scientific research. Although cultivation experiments have confirmed the presence of diverse nitrogen-fixing microorganisms, direct in situ evidence has been lacking. Therefore, a deep-sea in situ surface-enhanced Raman scattering sensor has been developed. It can adapt to extreme environment (≥350°C and ≥2000-m depth and LOD < 10 −7 M) and has excellent deep-sea application potential. Crucially, the sensor achieved the in situ detection of cyanide (-CN) (>5.7 μM) at cold seep, providing direct evidence for an energy-efficient nitrogen fixation pathway in the microbial communities. Concurrently, the gradient detection results indicated that CN was consumed as a microbial “circulating currency.” This finding offers critical in situ evidence for understanding the coupling mechanisms of cold seep carbon, nitrogen, and sulfur cycles, marking a substantial breakthrough in deep-sea sensing technology.

Superior anti-smudge and flame retardancy of polydimethylsiloxane composite coating with phosphorus modified CO0.5Ni0.5Fe2O4

Lei Yang,Yuese Chen,Ting Zhang,Heqing Fu

In this work, the CO 0.5 Ni 0.5 Fe 2 O 4 nanoparticles modified by phosphoric acid and  NCO groups were prepared as flame-retardants and cross-linking centers. After modification, the dispersibility and flame-retardant properties of the nanoparticles were effectively improved. On this basis, a kind of two-component polyester-based anti-smudge and flame retardant hybrid coating in situ polymerization was prepared by using dihydroxy mono-terminated PDMS to provide low surface energy, dipentaerythritol (Di-PE) as a charring agent to provide sufficient cross-linking sites. Water, ink, pump oil, and cooking oil could slide off the coated surface without leaving any traces. These novel hybrid coatings exhibit excellent anti-graffiti properties and corrosion resistance even with 2 wt% PDMS and 3 wt% modified nanoparticles content. Moreover, Si, P, and CO 0.5 Ni 0.5 Fe 2 O 4 all resulted in the formation of a char protective layer during burning. The thermal properties and flame retardant properties of the hybrid coatings were significantly improved. The peak heat release rate (PHRR) curves and the smoke production rate (PSPR) of hybrid coatings (3 wt% modified CO 0.5 Ni 0.5 Fe 2 O 4 ) decreased by 44.2%, 55.7%, respectively, compared with pure composites. Besides, the hybrid coatings can be applied to a variety of substrates, including glass, steel, and fabric.

Calcium and phosphorus co-doped carbon dots enhance osteogenic differentiation for calvarial defect repair in situ

Lin Wu,Yunchao Wu,Liu Jingjin,Suwan Liu,Qianzhe Li,Mengyu Yang,Miaomiao Zhang,Qing Ji,Feimin Zhang,Fengyi Du

Calvarial bone defect remains a clinical challenge due to the lack of efficient osteo-inductive agent. Herein, a novel calcium and phosphorus codoped carbon dot (Ca/P-CD) for bone regeneration was synthesized using phosphoethanolamine and calcium gluconate as precursors. The resultant Ca/P-CDs exhibited ultra-small size, stable excitation dependent emission spectra and favorable dispersibility in water. Moreover, Ca/P-CDs with good biocompatibility rapidly entered the cytoplasm through endocytosis and increased the expression of bone differentiation genes. After mixing with temperature-sensitive hydrogel, Ca/P-CDs were injected in situ into calvarial defect and promoted the repair of bone injury. These Ca/P-CDs provide a new treatment method for the bone repair and should be expended the application in the biomedical fields.

Framework-promoted charge transfer for highly selective photoelectrochemical biosensing of dopamine

Weisu Kong,Da Zhu,Rengan Luo,Siqi Yu,Huangxian Ju

Traditional photoelectrochemical (PEC) systems with inorganic semiconductors as photoactive materials generally involve effortless recombination of electron-hole pairs, which greatly limit the detection sensitivity. The arrangement of multiple components with tunable bandgaps provides an effective way to accelerate charge transfer. In this work, a framework material with adjustable structure was used to promote the charge transfer in the PEC process. The framework was constructed with 9,10-di(p-carboxyphenyl)anthracene (DPA) ligands as the light collector to coordinate with Zn 2+ nodes, which formed an electronegative metal-organic framework (ZnMOF), and showed good conductivity and PEC performance due to the π-π stacking of DPA and the intrareticular charge transfer. Based on the band and charge matching of dopamine (DA) with ZnMOF, the ZnMOF modified electrode as a biosensor showed excellent PEC response to DA with good selectivity, thus realized sensitive detection of DA ranging from 0.03 to 10 μM with a detection limit of 17.7 nM. The biosensor could be used to monitor the release of DA from PC12 cells and evaluate the stimulation of K + to DA release . The conductive framework material provided an approach to develop highly selective sensing platform for trace bioanalysis .

Rootstock–scion exchanging mRNAs participate in the pathways of amino acid and fatty acid metabolism in cucumber under early chilling stress

Liu Wenqian,Wang Qing,Zhang Ruoyan,Liu Mengshuang,Wang Cuicui,Liu Zixi,Xiang Chenggang,Lu Xiaohong,Zhang Xiaojing,Li Xiaojun,Wang Tao,Gao Lihong,Zhang Wenna

Low-temperature plasma induced phosphate groups onto coffee residue-derived porous carbon for efficient U(VI) extraction

Zhongshan Chen,Xuan He,Qian Li,Hui Yang,Yang Liu,Lining Wu,Zhixin Liu,Baowei Hu,Xiangke Wang

For the continuous utilization of nuclear energy and efficient control of radioactive pollution, low-cost materials with high efficient U(VI) removal are of great importance. In this study, low temperature plasma method was applied for the successful modification of O-phosphorylethanolamine (O-PEA) on the porous carbon materials. The produced materials (Cafe/O-PEA) could adsorb U(VI) efficiently with the maximum sorption capacity of 648.54 mg/g at 1 hr, T=298 K, and pH=6.0, much higher than those of most carbon-based composites. U(VI) sorption was mainly controlled by strong surface complexation. From FTIR, SEM-EDS and XPS analyses, the sorption of U(VI) was related to the complexation with -NH 2 , phosphate and -OH groups on Cafe/O-PEA. The low temperature plasma method was an efficient, environmentally friendly and low-cost method for surface modification of materials for the effective enrichment of U(VI) from aqueous solutions.

An inner-filter-effect based ratiometric fluorescent sensor for the detection of uranyl ions in real samples

Hua-Rui Nan,Yun-Hai Liu,Wen-Juan Gong,Hong-Bo Peng,You-Qun Wang,Zhi-Bin Zhang,Xiao-Hong Cao

In this work, a ratiometric fluorescence system was designed for the detection of trace UO22+ in water based on the inner filter effect (IFE) between gold nanoparticles (AuNPs) and gold nanoclusters (AuNCs). IFE-induced fluorescence quenching was achieved due to the enhanced complementary overlap between the absorption spectra of AuNPs and the emission spectrum of AuNCs after the addition of UO22+. Blue carbon dots (B-CDs) were added to serve as reference fluorophores to expand the color tonality and make human eye recognition easier. The ratiometric fluorescent sensor demonstrated a unique fluorescence color change from red to blue when different doses of UO22+ were added, with a detection limit of 8.4 nM. Furthermore, the ratiometric fluorescent sensor was effectively used for UO22+ determination in real-world water samples, with acceptable recoveries.

Determination of ammonium in natural water using a quinoline-based o-dialdehyde fluorescent reagent with visible excitation wavelength

Xuejia Chen,Tingkai Xiong,Jin Xu,Yan Li,Min Zhang,Ying Liang

In this paper, a novel and stable fluorescent reagent, quinoline-2,3-dicarbaldehyde (QDA), is synthesized as a probe to detect ammonium in natural water. Ammonium reacts with QDA in the presence of SO32− and Ca2+ to form a fluorescence product, which has maximum excitation and emission wavelengths at 429 nm and 518 nm. The concentration of reagents, the reaction temperature, the reaction time, and the pH in the final solution are investigated and optimized. The interferences of typical organic nitrogen and inorganic compounds are evaluated, and results prove that most volatile amines have little or negligible effect. Under the optimized conditions, this method provides a limit of detection of 0.065 μmol L−1, a calibration range of 0.216–9 μmol L−1, and reproducibility (with a relative standard deviation) of 1.9% for 1.5 μmol L−1 ammonium. For water sample analysis, the proposed method provides comparable results to those of the conventional o-phthalaldehyde method but has longer reagent stability (42 days).

Adsorptive removal of U(VI) from aqueous solution by hydrothermal carbon spheres with phosphate group

Yu Xiao-Feng,Liu Yun-Hai,Zhou Zhi-Wei,Xiong Guo-Xuan,Cao Xiao-Hong,Li Min,Zhang Zhi-Bin

The phosphorylated hydrothermal carbon spheres (HCS-PO 4 ) were developed by functionalizing hydrothermal carbon spheres (HCS) with o -phosphoethanolamine, and the structure and textural property were characterized by SEM and FT-IR. The parameters that affect the uranium(VI) sorption, such as solution pH, initial U(VI) concentration, contact time, and temperature, had been investigated. The HCS-PO 4 showed the highest uranium sorption capacity at initial pH 6.0 and contact time of 120 min. The adsorption kinetics was better described by the pseudo-second-order model, and the adsorption process could be well defined by the Langmuir isotherm and the maximum monolayer adsorption capacity increased from 80.00 to 434.78 mg/g after phosphorylation. The thermodynamic parameters, ∆ G° (298 K), ∆ H ° and ∆ S °, demonstrated shown that the sorption process of U(VI) onto HCS-PO 4 was feasible, spontaneous and endothermic in nature. The spent HCS-PO 4 could be effectively regenerated by 0.1 mol/L EDTA solution for the removal and recovery of U(VI) and reused for ten cycles at least. Selective adsorption studies showed that the HCS-PO 4 could selectively remove U(VI), and the selectivity coefficients of HCS in the presence of co-existing ions, Mg(II), Na(I), Zn(II), Mn(II),Co(II), Ni(II), Sr(II), Cs(I) and Hg(II) improved after functionalization.

Full-course NIR-II imaging-navigated fractionated photodynamic therapy of bladder tumours with X-ray-activated nanotransducers

He Liangrui,Wang Liyang,Yu Xujiang,Tang Yizhang,Jiang Zhao,Yang Guoliang,Liu Zhuang,Li Wanwan

The poor 5-year survival rate for bladder cancers is associated with the lack of efficient diagnostic and treatment techniques. Despite cystoscopy-assisted photomedicine and external radiation being promising modalities to supplement or replace surgery, they remain invasive or fail to provide real-time navigation. Here, we report non-invasive fractionated photodynamic therapy of bladder cancer with full-course real-time near-infrared-II imaging based on engineered X-ray-activated nanotransducers that contain lanthanide-doped nanoscintillators with concurrent emissions in visible and the second near-infrared regions and conjugated photosensitizers. Following intravesical instillation in mice with carcinogen-induced autochthonous bladder tumours, tumour-homing peptide-labelled nanotransducers realize enhanced tumour regression, robust recurrence inhibition, improved survival rates, and restored immune homeostasis under X-ray irradiation with accompanied near-infrared-II imaging. On-demand fractionated photodynamic therapy with customized doses is further achieved based on quantifiable near-infrared-II imaging signal-to-background ratios. Our study presents a promising non-invasive strategy to confront the current bladder cancer dilemma from diagnosis to treatment and prognosis.

Mechanism of discoloration of Antarctic krill oil upon storage: A study based on model systems

Xiang-Bo Zeng,Xue-Chen Pei,De-Yang Li,Fa-Wen Yin,Hui-Lin Liu,Meng-Ling Jin,Jiang-Hua Zhang,Da-Yong Zhou

The reddish-orange color of Antarctic krill oil fades during storage, and the mechanism remains unclear. Model systems containing different combinations of astaxanthin (ASTA), phosphatidylethanolamine (PE), and tocopherol were subjected to accelerated storage. Among all groups containing ASTA, only the ones with added PE showed significant fading. Meanwhile, the specific UV–visible absorption (A 470 and A 495 ) showed a similar trend. Peroxide value and thiobarbituric acid reactive substances increased during storage, while ASTA and PE contents decreased. Correlation analysis suggested that oxidized PE promoted fading by accelerating the transformation of ASTA. PE content exceeded the critical micelle concentration (1μg/g) indicating the formation of reverse micelles. Molecular docking analysis indicated that PE also interacted with ASTA in an anchor-like manner. Therefore, it is speculated that amphiphilic ASTA is more readily distributed at the oil-water interface of reverse micelles and captured by oxidized PE, which facilitates oxidation transfer, leading to ASTA oxidation and color fading.

An ALP-responsive, anionic iridium complex for specific recognition of osteosarcoma cells

Shuang Shen,Shuli Nong,Xianpeng Zhang,Jiaqi Song,Caiting Meng,Xinling Liu,Liang Shao,Guanying Li,Li Xu

Poor cellular permeability greatly hampers the utilization of anionic Ir(III) complexes, though efficiently emissive and remarkably stable, in cell-based diagnosis. To overcome this barrier, we present the development of an alkaline phosphatase (ALP)-responsive, anionic, and aggregation-induced emission (AIE)-active Ir(III) complex (Ir1) for specific recognition of osteosarcoma cells. Containing phosphate moieties, Ir1 exhibits a net −1 charge, enabling charge repulsion from the cell membrane and resulting in low cellular uptake and good biocompatibility in normal osteoblast cells. Upon ALP-mediated hydrolysis of phosphate groups, the resulting dephosphorylated product, Ir2, demonstrates a positive charge and increased lipophilicity, promoting cellular uptake and activating its AIE properties for specific recognition of osteosarcoma cells that express elevated levels of ALP. This study elucidates the role of ALP as an ideal trigger for enhancing the cellular permeability of phosphate ester-containing Ir(III) complexes, thus expanding the potential of anionic Ir(III) complexes for biomedical applications.