Synthesis of Organic Dye-Impregnated Silica Shell-Coated Iron Oxide Nanoparticles by a New Method

A new method for preparing magnetic iron oxide nanoparticles coated by organic dye-doped silica shell was developed in this article. Iron oxide nanoparticles were first coated with dye-impregnated silica shell by the hydrolysis of hexadecyltrimethoxysilane (HTMOS) which produced a hydrophobic core for the entrapment of organic dye molecules. Then, the particles were coated with a hydrophilic shell by the hydrolysis of tetraethylorthosilicate (TEOS), which enabled water dispersal of the resulting nanoparticles. The final product was characterized by X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, photoluminescence spectroscopy, and vibration sample magnetometer. All the characterization results proved the final samples possessed magnetic and fluorescent properties simultaneously. And this new multifunctional nanomaterial possessed high photostability and minimal dye leakage

Gender-specific effects of oxidative balance score on the prevalence of diabetes in the US population from NHANES

BackgroundThe relationship between oxidative balance score (OBS) and diabetes remains poorly understood and may be gender-specific. We conducted a cross-sectional study to investigate the complex association between OBS and diabetes among US adults.MethodsOverall, 5,233 participants were included in this cross-sectional study. The exposure variable was OBS, composed of scores for 20 dietary and lifestyle factors. Multivariable logistic regression, subgroup analysis, and restricted cubic spline (RCS) regression were applied to examine the relationship between OBS and diabetes.ResultsCompared to the lowest OBS quartile group (Q1), the multivariable-adjusted odds ratio (OR) (95% confidence interval (CI) for the highest OBS quartile group (Q4) was 0.602 (0.372–0.974) (p for trend = 0.007), and for the highest lifestyle, the OBS quartile group was 0.386 (0.223–0.667) (p for trend < 0.001). Moreover, gender effects were found between OBS and diabetes (p for interaction = 0.044). RCS showed an inverted-U relationship between OBS and diabetes in women (p for non-linear = 6e−04) and a linear relationship between OBS and diabetes in men.ConclusionsIn summary, high OBS was negatively associated with diabetes risk in a gender-dependent manner

Dual functions of the ZmCCT-associated quantitative trait locus in flowering and stress responses under long-day conditions

Gene ontology enrichment of differentially expressed genes in HZ4 and HZ4-NIL in three development stages. (XLS 21 kb

Bi-Functional Silica Nanoparticles Doped with Iron Oxide and CdTe Prepared by a Facile Method

Cadmium telluride (CdTe) and iron oxide nanoparticles doped silica nanospheres were prepared by a multistep method. Iron oxide nanoparticles were first coated with silica and then modified with amino group. Thereafter, CdTe nanoparticles were assembled on the particle surfaces by their strong interaction with amino group. Finally, an outer silica shell was deposited. The final products were characterized by X-ray powder diffraction, transmission electron microscopy, vibration sample magnetometer, photoluminescence spectra, Fourier transform infrared spectra (FT-IR), and fluorescent microscopy. The characterization results showed that the final nanomaterial possessed a saturation magnetization of about 5.8 emu g−1and an emission peak at 588 nm when the excitation wavelength fixed at 380 nm

Bi-Functional Silica Nanoparticles Doped with Iron Oxide and CdTe Prepared by a Facile Method

Abstract Cadmium telluride (CdTe) and iron oxide nanoparticles doped silica nanospheres were prepared by a multistep method. Iron oxide nanoparticles were first coated with silica and then modified with amino group. Thereafter, CdTe nanoparticles were assembled on the particle surfaces by their strong interaction with amino group. Finally, an outer silica shell was deposited. The final products were characterized by X-ray powder diffraction, transmission electron microscopy, vibration sample magnetometer, photoluminescence spectra, Fourier transform infrared spectra (FT-IR), and fluorescent microscopy. The characterization results showed that the final nanomaterial possessed a saturation magnetization of about 5.8 emu g&#8722;1and an emission peak at 588 nm when the excitation wavelength fixed at 380 nm.</p

Ultrafine platinum nanoparticles supported on covalent organic frameworks as stable and reusable oxidase-like catalysts for cellular glutathione detection

Nanozymes have been widely developed as supplements of natural enzymes owing to their relatively low cost, high mass production, easy storage, good stability, and reusability. By controlling the particle size, nanozymes’ catalytic activities can distinctly be improved. The porous materials such as covalent organic frameworks (COFs) are definitely considered as promising supports for in situ preparation of high dispersity and small-size nanozymes. Herein, we designed and synthesized COF supported ultrafine platinum nanoparticles (Pt NPs/COF-300-AR) by controlling the growth of Pt NPs by using uniformly distributed nitrogen atoms of well-organized framework structures of 3D COFs. Pt NPs/COF-300-AR nanohybrids catalyzed the colorless 3,3′,5,5′-tetramethylbenzidine (TMB) solution to turn blue, displaying excellent oxidase-like activity, good stability, and high reusability, which should be owed to the uniform size and high dispersity of ultrafine Pt NPs. By virtue of those advantages, the TMB-Pt NPs/COF-300-AR colorimetric platform was successfully applied to cellular glutathione detection. Similarly, other COFs with good acid resistance and abundant functional groups can also be used as the supports of a nanozyme, which will greatly expand the members of the nanoenzyme family. KEYWORDS: oxidase mimic, in situ preparation, ultrafine Pt nanoparticles, COF support, glutathione, nanohybrids, colorimetry, cell lysat

Thermal habitat of giant panda has shrunk by climate warming over the past half century

Climate warming is increasing the risks of extinction for many species. Giant panda is one of the most vulnerable mammals to climate warming due to its small population size and specialized diet of bamboo. Many studies have quantified projected habitat loss based on climate-change scenarios, but few have employed empirical data to investigate how the thermal habitat of giant panda has changed. In this study, we investigated the frequency, duration, and intensity of potential heat stress (PHS) occurrence that could surpass the biological threshold of giant panda by analyzing daily temperatures throughout the distribution range of giant panda from 1960 to 2010 and giant panda population survey data. We found an increase in the frequency of PHS25 (PHS above threshold of 25 degrees C) occurrence at a rate of 1.1-5.5 days/decade. The start date of PHS25 occurrence advanced at a rate of - 1.2 to - 4.6 days/decade, while the end date of PHS25 occurrence was delayed at a rate of 0.8-3.0 days/decade. The giant panda habitat is being exposed to an increased PHS occurrence. The area within reserves and densely populated giant panda habitat exposed to PHS occurrence expanded by 32-317% and 38-218%, respectively from the 1960s to the 2000s. Furthermore, PHS occurrence is intensifying; the annual accumulated degree-days of PHS25 and PHS30 occurrence (PHS above threshold of 30 degrees C) within the reserves increased by 39% and 140%, respectively. These results confirm that the potential threats to giant panda from climate warming are intensifying. It is urgent to expand the extent and range of giant panda habitat to allow giant pandas to move across landscapes in the face of ongoing climate warming

Colorimetric Detection of Urine Glucose Based ZnFe₂O₄ Magnetic Nanoparticles

In this paper, we discovered that ZnFe₂O₄ magnetic nanoparticles (MNPs) possess intrinsic peroxidase-like activity. ZnFe₂O₄ MNPs exhibit several advantages such as high catalytic efficiency, good stability, monodispersion, and rapid separation over other peroxidase nanomimetics and horseradish peroxidase (HRP). ZnFe₂O₄ MNPs were used as a colorimetric biosensor for the detection of urine glucose. This method is simple, inexpensive, highly sensitive, and selective for glucose detection using glucose oxidase (GOx) and ZnFe₂O₄ MNPs with a linear range from 1.25 × 10^–6 to 1.875 × 10^–5 mol L^–1 with a detection limit of 3.0 × 10^–7 mol L^–1. The color change observable by the naked eyes based on the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) is the principle for the sensing of urine glucose level