Efficient electrochemical reduction of CO2 and H2O into industrial syngas with tunable CO/H2 ratios, especially integrated with anodic organic synthesis to replace the low‐value oxygen evolution ...reaction (OER), is highly desirable. Here, integration of controllable partial substitution of zinc (Zn) with amine incorporation into CdS‐amine inorganic‐organic hybrids is used to generate highly efficient electrocatalysts for synthesizing syngas with tunable CO/H2 ratios (0–19.7), which are important feedstocks for the Fischer–Tropsch process. Diethylenetriamine could enhance the adsorption and accelerate the activation of CO2 to form the key intermediate COOH* for CO formation. Zn substitution promoted the hydrogen evolution reaction (HER), leading to tunable CO/H2 ratios. Importantly, syngas and dihydroisoquinoline can be simultaneously synthesized by pairing with anodic semi‐oxidation of tetrahydroisoquinoline in a ZnxCd1−xS‐Amine ∥ Ni2P two‐electrode electrolyzer.
Kontrollierte partielle Substitution von Zn und Amin‐Einbau in organisch‐anorganischen ZnxCd1−xS‐Amin‐Hybriden liefert hocheffiziente Elektrokatalysatoren zur Erzeugung von Synthesegas mit abstimmbaren CO/H2‐Verhältnissen (0–19.7). Synthesegas und Dihydroisochinolin können simultan bei niedriger Zellspannung hergestellt werden.
Abstract
Efficient electrochemical reduction of CO
2
and H
2
O into industrial syngas with tunable CO/H
2
ratios, especially integrated with anodic organic synthesis to replace the low‐value oxygen ...evolution reaction (OER), is highly desirable. Here, integration of controllable partial substitution of zinc (Zn) with amine incorporation into CdS‐amine inorganic‐organic hybrids is used to generate highly efficient electrocatalysts for synthesizing syngas with tunable CO/H
2
ratios (0–19.7), which are important feedstocks for the Fischer–Tropsch process. Diethylenetriamine could enhance the adsorption and accelerate the activation of CO
2
to form the key intermediate COOH* for CO formation. Zn substitution promoted the hydrogen evolution reaction (HER), leading to tunable CO/H
2
ratios. Importantly, syngas and dihydroisoquinoline can be simultaneously synthesized by pairing with anodic semi‐oxidation of tetrahydroisoquinoline in a Zn
x
Cd
1−
x
S‐Amine ∥ Ni
2
P two‐electrode electrolyzer.
In this work, molybdenum disulfide (MoS sub(2)) nanosheets were employed to enhance the mechanical and thermal properties of chitosan (CS), which was one of the most promising biomaterials. In order ...to promote a homogeneous dispersion of MoS sub(2) and improved interface interactions between CS and fillers, carboxyl functionalization was subjected to the exfoliated MoS sub(2) nanosheets by chemical conjugation with thioglycolic acid before compositing with CS. Afterward, the CS/MoS sub(2)-g-COOH composite films were prepared by a simple solution blending method. Micromorphology characterizations showed that MoS sub(2)-g-COOH nanosheets dispersed much better than unmodified MoS sub(2) nanosheets, which was considered to be quite beneficial for the enhanced properties of CS nanocomposites. DMA results indicated that the mechanical properties of CS were improved by incorporating with MoS sub(2)-g-COOH nanosheets compared with neat CS and unmodified MoS sub(2)-filled CS. The thermal stability of CS/MoS sub(2)-g-COOH was also improved. This work demonstrated a promising route to prepare MoS sub(2)-based polymer nanocomposites with excellent performances.
In this work, molybdenum disulfide (MoS.sub.2) nanosheets were employed to enhance the mechanical and thermal properties of chitosan (CS), which was one of the most promising biomaterials. In order ...to promote a homogeneous dispersion of MoS.sub.2 and improved interface interactions between CS and fillers, carboxyl functionalization was subjected to the exfoliated MoS.sub.2 nanosheets by chemical conjugation with thioglycolic acid before compositing with CS. Afterward, the CS/MoS.sub.2-g-COOH composite films were prepared by a simple solution blending method. Micromorphology characterizations showed that MoS.sub.2-g-COOH nanosheets dispersed much better than unmodified MoS.sub.2 nanosheets, which was considered to be quite beneficial for the enhanced properties of CS nanocomposites. DMA results indicated that the mechanical properties of CS were improved by incorporating with MoS.sub.2-g-COOH nanosheets compared with neat CS and unmodified MoS.sub.2-filled CS. The thermal stability of CS/MoS.sub.2-g-COOH was also improved. This work demonstrated a promising route to prepare MoS.sub.2-based polymer nanocomposites with excellent performances.
An error-controlled method for superpixel segmentation Nannan Meng; Fang Meng; Meng Chen
2016 9th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics (CISP-BMEI),
2016-Oct.
Conference Proceeding
Superpixel segmentation refers to represent an image by small regions composed of pixels with the similar characteristics, which can carry more perceptual and semantic meaning than their simple pixel ...grid counterparts. Therefore, it is very important to distribute superpixels with different size over an image for describing image details. In this paper, a new superpixel generation method based on an error-controlled strategy is put forward. At first, we use the SLIC method as a pretreatment step to obtain a preliminary segmentation image. After that, we set two thresholds to iteratively perform the region merging and mean pooling operations. One of the thresholds is used as the condition of merging in two superpixels. The other is used to control the convergence of the whole image error. According to the experimental results, our algorithm can fulfill a comparable trade-off between the number of superpixels and image details representation. In addition to the effective distribution of superpixels, our method can keep the boundary of the main object in the image.
A novel synthesis method was reported for the preparation of silver/reduced graphene oxide (Ag/RGO) nanocomposites
via
reducing AgNO
3
in a macroscopic RGO aerogel directly through a convenient ...impregnation process. The as-prepared RGO-supported Ag nanocrystal exhibited high activity in the catalytic hydrogenation of 4-nitrophenol.
Ag/RGO nanocomposites were prepared
via
reducing AgNO
3
in a macroscopic RGO aerogel directly through a convenient impregnation process, which exhibited high activity in the catalytic hydrogenation of 4-nitrophenol.
To investigate 18β-sodium glycyrrhetinic acid impact on nasal mucosa epithelial cilia in rat models of allergic rhinitis (AR).
AR models were established by ovalbumin-induction. Wister rats were ...randomly divided into groups as normal group, model group, budesonide (0.2 mg/kg) group and sodium glycyrrhetinic acid (20 mg/kg and 40 mg/kg) group after the success of AR models. At 2 weeks and 4 weeks after treatment, the behavioral changes of rats were observed and recorded, and nasal septum mucosae were collected after 2 week and 4 week intervention, and the morphological changes of nasal mucosae were observed by electron microscope.
Model group developed typical AR symptoms, the total score in all animals was > 5. With budesonide and sodium glycyrrhetinic acid treatment, the AR symptoms were relieved, and the total scores were reduced significantly (P < 0.01). Compared with the model group: after 2 weeks' intervention, thick mucous secretions on the top of columnar epithelium cilia in rat nasal mucosa was signif
Chlorin e6-pHLIPss-AuNRs, a gold nanorod-photosensitizer conjugate containing a pH （low） insertion peptide （pHLIP） with a disulfide bond which imparts extracellular pH （pHe）-driven tumor targeting ...ability, has been successfully developed for bimodal photodynamic and photothermal therapy. In this bimodal therapy, chlorin e6 （Ce6）, a second-generation photosensitizer （PS）, is used for photodynamic therapy （PDT）. Gold nanorods （AuNRs） are used as a hyperthermia agent for photothermal therapy （PTT） and also as a nanocarrier and quencher of Ce6. pHLIPss is designed as a pile-driven targeting probe to enhance accumulation of Ce6 and AuNRs in cancer cells at low pH. In Ce6- pHLIPss-AuNRs, Ce6 is close to and quenched by AuNRs, causing little PDT effect. When exposed to normal physiological pH 7.4, Ce6-pHLIPs~-AuNRs loosely associate with the cell membrane. However, once exposed to acidic pH 6.2, pHLIP actively inserts into the cell membrane, and the conjugates are translocated into cells. When this occurs, Ce6 separates from the AuNRs as a result of disulfide bond cleavage caused by intracellular glutathione （GSH）, and singlet oxygen is produced for PDT upon light irradiation. In addition, as individual PTT agent, AuNRs can enhance the accumulation of PSs in the tumor by the enhanced permeation and retention （EPR） effect. Therefore, as indicated by our data, when exposed to acidic pH, Ce6-pHLIPss-AuNRs can achieve synergistic PTT/PDT bimodality for cancer treatment.
Dear Editor, It is now believed that the human genome contains a significant portion of regulatory bases, including a great number of transcription factor （TF）-binding cis-ele- ments 1 , whose ...functions are largely unexplored due to the lack of convenient experimental methods to model element-specific loss-of-function. Based on recent technological breakthroughs adapting the bacterial type II CRISPR/Cas9 system for RNA-guided gene edit- ing and transcriptional programming 2, we tested the application of the non-cleavage dCas9/sgRNA as a se- quence-specific cis-element-targeting platform in human cells. Our study established a convenient, efficient and flexible approach that may pave the way for functional annotation of TF-binding cis-elements in higher organ- isms.
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