From powder to cloth: Facile fabrication of dense MOF-76(Tb) coating onto natural silk fiber for feasible detection of copper ions

The deposition of powdered MOFs material onto other substrates is essential to avoid inconvenience during its practical applications. In this work, domestic silk fiber was utilized as the skeleton, for successful coating of dense luminescent MOF-76(Tb). Its surface functionality which consist of abundance of intrinsic carboxylic groups, smooth surface structure, and 80% of tensile strength were maintained after being immersed in different thermal solvents (water, ethanol, DMF @ 80 °C) for 24 h, revealing good solvent and thermal resistance. By using hydrothermal, microwave assisted, and layer-by-layer methods, different crystal morphologies (pillar-like, sedimentary-rock-like, and needle-like morphology) and varying degrees of surface coverage rate were obtained, as a result of different levels of anchoring promotion and crystal controlling effect. The MOFs coating can be confirmed by its XRD pattern and fluorescent property. More importantly, the quenching effect of the composite in a condition of Cu2+ was first reported with high selectivity, sensitivity (i.e. a linear detection concentration range of 10−3–10−5 M with a low detection limit up to 0.5 mg/L, KSV of 1192 M−1 at 293 K), and rapid response time (5 min), making the composite a good candidate for colorimetric and fluorescent detection of aquatic Cu2+. The quenching mechanism is proposed to associate with the interaction between Cu2+ and benzene-tricarboxylate (BTC) ligand, which resulted in the decrease of energy transfer efficiency. The selectivity over other common cations depends on the unsaturated electron configuration and the smaller ionic radius of Cu2+

Fertilizer potential of liquid product from hydrothermal treatment of swine manure

Compared with composting, hydrothermal treatment (HTT) technology can dramatically shorten the duration for manure waste treatment. This study firstly investigated the effect of HTT on solubilization of N, P and organics from swine manure, and then evaluated the phytotoxicity of liquid product from hydrothermally treated manure by seed germination test. Results show that 98% of N in manure could be converted into soluble form after HTT at 200 °C for 60 min. Soluble P in hydrothermally treated manure (at 150 °C for 60 min) was 2.7 times that in raw manure. The germination indices (GI) were all greater than 100% when the liquid product (from HTT at 150 °C for 60 min) or its diluted samples being used. Results from this study suggest that HTT could be a promising technology for producing safe and value-added liquid fertilizers from swine manure

Short-term Power Forecasting Method and Application of Wind Farm

The prediction of output power of wind farm has important value and significance to the normal operation of some large-scale wind power system. In this paper, the related prediction methods and practical application are studied, and the short-term power forecasting method of the wind power of the vector machine-Markov chain is proposed

Data from: Feeding intolerance alters the gut microbiota of preterm infants

Feeding intolerance (FI) is a common disease in preterm infants, often causing a delay in individual development. Gut microbiota play an important role in nutrient absorption and metabolism of preterm infants. To date, few studies have focused on the community composition of gut microbiota of preterm infants with feeding intolerance. In this study, we collected fecal samples from 41 preterm infants diagnosed with feeding intolerance and 29 preterm infants without feeding intolerance, at three specific times during the development and prevalence of feeding intolerance (after birth, when feeding intolerance was diagnosed, after feeding intolerance was gone), from different hospitals for 16S rRNA gene sequencing. The gut microbiota community composition of preterm infants diagnosed with feeding intolerance was significantly different from that of preterm infants without feeding intolerance. At the time when feeding intolerance was diagnosed, the relative abundance of Klebsiella in preterm infants with feeding intolerance increased significantly, and was significantly higher than that of the preterm infants without feeding intolerance. After feeding intolerance was cured, the relative abundance of Klebsiella significantly decreased in the infants diagnosed with feeding intolerance, while the relative abundance of Klebsiella in preterm infants without feeding intolerance was not significantly altered during the development and prevalence of feeding intolerance. Furthermore, we verified that Klebsiella was effective in the diagnosis of feeding intolerance (AUC = 1) in preterm infants, suggesting that Klebsiella is a potential diagnostic biomarker for feeding intolerance

Feeding intolerance alters the gut microbiota of preterm infants.

Feeding intolerance (FI) is a common disease in preterm infants, often causing a delay in individual development. Gut microbiota play an important role in nutrient absorption and metabolism of preterm infants. To date, few studies have focused on the community composition of gut microbiota of preterm infants with feeding intolerance. In this study, we collected fecal samples from 41 preterm infants diagnosed with feeding intolerance and 29 preterm infants without feeding intolerance, at three specific times during the development and prevalence of feeding intolerance (after birth, when feeding intolerance was diagnosed, after feeding intolerance was gone), from different hospitals for 16S rRNA gene sequencing. The gut microbiota community composition of preterm infants diagnosed with feeding intolerance was significantly different from that of preterm infants without feeding intolerance. At the time when feeding intolerance was diagnosed, the relative abundance of Klebsiella in preterm infants with feeding intolerance increased significantly, and was significantly higher than that of the preterm infants without feeding intolerance. After feeding intolerance was cured, the relative abundance of Klebsiella significantly decreased in the infants diagnosed with feeding intolerance, while the relative abundance of Klebsiella in preterm infants without feeding intolerance was not significantly altered during the development and prevalence of feeding intolerance. Furthermore, we verified that Klebsiella was effective in the diagnosis of feeding intolerance (AUC = 1) in preterm infants, suggesting that Klebsiella is a potential diagnostic biomarker for feeding intolerance

Temperature variations in simulated warming alter photosynthesis of two emergent plants in plateau wetlands, China

Abstract Understanding the impact of temperature variations (i.e., maximum, minimum, and diurnal temperature ranges [DTRs]) on ecosystems is now recognized as being of paramount importance in global change ecology; the roles of different aspects of these temperature variations in influencing plant photosynthesis remain under‐studied. Here, we investigated the photosynthetic responses of two local dominant wetland plants to two simulated air‐warming scenarios (+2° ± 0.5°C and +3.5° ± 0.5°C) by using open‐top chambers in the northwest Yunnan plateau. During the growing season from 2014 to 2016, we explored photosynthetic parameters and the relationships linking photosynthesis to temperature variations. We found that open‐top chambers had increased the daily maximum temperature as well as DTRs. The photosynthetic responses of two plant species to warming were species‐specific during the first two years but species‐independent in the third year. The two warming scenarios did not significantly alter the linear relationships linking maximum net photosynthetic rate (Amax) to stomatal conductance (gs), intercellular CO2 concentration (Ci), and transpiration rate (Tr), despite changes in slopes and intercepts of the fitted lines. The DTRs between 0°C and 30°C were positively correlated with photosynthesis, while DTRs over 30°C were negatively correlated with photosynthesis. Our results provide experimental evidence that temperature variations play a greater role than increasing average temperature in explaining plant photosynthesis, and more attention should be paid to temperature variations when assessing the impact of climate warming on wetland ecosystem

Preparation of Vertically Oriented TiO₂ Nanosheets Modified Carbon Paper Electrode and Its Enhancement to the Performance of MFCs

A unique vertically oriented TiO₂ nanosheets (TiO₂-NSs) layer was synthesized in situ on the surface of a carbon paper (CP) electrode via hydrothermal synthesis upon addition of a suitable amount of activated carbon powders in a reactor. Field emission scanning electron microscopy images showed that the nanosheets were about 2 μm in length, 200–600 nm in width and 15 nm in thickness. X-ray diffraction and Raman patterns verified TiO₂-NSs crystallized in the anatase phase. The electrochemical activities of CP and TiO₂-NSs/CP electrode have been investigated by cyclic voltammetry and electrochemical impedance spectroscopy. The maximum power output density of a mixed consortia inoculated microbial fuel cell was increased by 63% upon using TiO₂-NSs/CP as a bioanode compared with that using bare CP as a bioanode. The performance improvement could be ascribed to unique 3D open porous interface made of vertically oriented TiO₂-NSs, which provides good biocompatibility, favorable mass transport process, large surface areas for adhension of bacteria and direct pathways for electron movement to the electrode

A multiscale modeling method incorporating spatial coupling and temporal coupling into transient simulations of the human airways

In this article, a novel multiscale modeling method is proposed for transient computational fluid dynamics (CFD) simulations of the human airways. The developed method is the first attempt to incorporate spatial coupling and temporal coupling into transient human airway simulations, aiming to improve the flexibility and the efficiency of these simulations. In this method, domain decomposition was used to separate the complex airway model into different scaled domains. Each scaled domain could adopt a suitable mesh and timestep, as necessary: the coarse mesh and large timestep were employed in the macro regions to reduce the computational cost, while the fine mesh and small timestep were used in micro regions to maintain the simulation accuracy. The radial point interpolation method was used to couple data between the coarse mesh and the fine mesh. The continuous micro solution–intermittent temporal coupling method was applied to bridge different timesteps. The developed method was benchmarked using a well-studied four-generation symmetric airway model under realistic normal breath conditions. The accuracy and efficiency of the method were verified separately in the inhalation phase and the exhalation phase. Similar airflow behavior to previous studies was observed from the multiscale airway model. The developed multiscale method has the potential to improve the flexibility and efficiency of transient human airway simulations without sacrificing accuracy.</p