Developing effective catalysts to degrade chemical warfare agents is of great significance. Herein, a mesoporous MIL-101(Cr) composite material dangled with porphyrin molecules (denote as ...TCPP@MIL-101(Cr), TCPP = tetra(4-carboxyphenyl)porphyrin) is reported, which can be used as a heterogeneous photocatalyst for detoxification of mustard gas simulants 2-chloroethyl ethyl sulfide (CEES) to 2-chloroethyl ethyl sulfoxide (CEESO) with a half-life of 1 min. The catalytic performance of TCPP@MIL-101(Cr) is comparable to that of homogeneous molecular porphyrin. Mechanistic studies reveal that both
O
and O
are efficiently generated and play vital roles in the oxidation reaction. Gold nanoparticles (AuNPs) are attached to the TCPP@MIL-101(Cr) to further enhance the catalytic activity with a benchmark half-life of 45 s, which is the fastest record so far. A medical mask loaded TCPP@MIL-101(Cr) is fabricated for practical applications, which can selectively photoxidize CEES to CEESO under sunlight and air atmosphere, exhibiting the best degradation performance among the reported fabric-like composite materials.
Hollow nanoporous carbon architectures (HNCs) present significant utilitarian value for a wide variety of applications. Facile and efficient preparation of HNCs has long been pursued but still ...remains challenging. Herein, we for the first time demonstrate that single‐component metal–organic frameworks (MOFs) crystals, rather than the widely reported hybrid ones which necessitate tedious operations for preparation, could enable the facile and versatile syntheses of functional HNCs. By controlling the growth kinetics, the MOFs crystals (STU‐1) are readily engineered into different shapes with designated styles of crystalline inhomogeneity. A subsequent one‐step pyrolysis of these MOFs with intraparticle difference can induce a simultaneous self‐hollowing and carbonization process, thereby producing various functional HNCs including yolk‐shell polyhedrons, hollow microspheres, mesoporous architectures, and superstructures. Superior to the existing methods, this synthetic strategy relies only on the complex nature of single‐component MOFs crystals without involving tedious operations like coating, etching, or ligand exchange, making it convenient, efficient, and easy to scale up. An ultra‐stable Na‐ion battery anode is demonstrated by the HNCs with extraordinary cyclability (93 % capacity retention over 8000 cycles), highlighting a high level of functionality of the HNCs.
It is for the first time found that single‐component MOFs (STU‐1) crystals with inner crystalline inhomogeneity could enable the facile and versatile syntheses of hollow nanoporous carbon architectures (HNCs) through an unexplored spontaneous hollowing mechanism. The obtain HNCs can act as a high‐capacity and ultra‐stable anode for Na‐ion batteries.
The exploration of highly efficient materials for the degradation of chemical warfare agents has been a longstanding task for preventing human exposure. Herein, we report a series of metal–organic ...frameworks (MOFs) M-TCPP-La based on metallo-tetra(4-carboxyphenyl)porphyrin and LaIII, which were applied to selectively oxidize 2-chloroethyl ethyl sulfide (CEES, a sulfur mustard simulant) as heterogeneous photocatalysts. After irradiation from a commercial blue light-emitting diode (LED), both superoxide ion and singlet oxygen were generated by M-TCPP-La and involved in selective oxidization of CEES to 2-chloroethyl ethyl sulfoxide (CEESO). Notably, a very short half lifetime (2.5 min) was achieved using Fe-TCPP-La as the photocatalyst. In comparison to currently utilizing singlet oxygen and hydrogen peroxide as oxidizing agents, this work employing both singlet oxygen and superoxide ion represents a new and effective strategy of detoxification of mustard gas.
Hollow nanoporous carbon architectures (HNCs) present significant utilitarian value for a wide variety of applications. Facile and efficient preparation of HNCs has long been pursued but still ...remains challenging. Herein, we for the first time demonstrate that single‐component metal–organic frameworks (MOFs) crystals, rather than the widely reported hybrid ones which necessitate tedious operations for preparation, could enable the facile and versatile syntheses of functional HNCs. By controlling the growth kinetics, the MOFs crystals (STU‐1) are readily engineered into different shapes with designated styles of crystalline inhomogeneity. A subsequent one‐step pyrolysis of these MOFs with intraparticle difference can induce a simultaneous self‐hollowing and carbonization process, thereby producing various functional HNCs including yolk‐shell polyhedrons, hollow microspheres, mesoporous architectures, and superstructures. Superior to the existing methods, this synthetic strategy relies only on the complex nature of single‐component MOFs crystals without involving tedious operations like coating, etching, or ligand exchange, making it convenient, efficient, and easy to scale up. An ultra‐stable Na‐ion battery anode is demonstrated by the HNCs with extraordinary cyclability (93 % capacity retention over 8000 cycles), highlighting a high level of functionality of the HNCs.
It is for the first time found that single‐component MOFs (STU‐1) crystals with inner crystalline inhomogeneity could enable the facile and versatile syntheses of hollow nanoporous carbon architectures (HNCs) through an unexplored spontaneous hollowing mechanism. The obtain HNCs can act as a high‐capacity and ultra‐stable anode for Na‐ion batteries.
Stabilizing pile is a kind of earth shoring structure frequently used in slope engineering. When the piles have cantilever segments above the ground,laggings are usually installed to avoid collapse ...of soil between piles. Evaluating the earth pressure acting on laggings is of great importance in design process.Since laggings are usually less stiff than piles,the lateral pressure on lagging is much closer to active earth pressure. In order to estimate the lateral earth pressure on lagging more accurately,first,a model test of cantilever stabilizing pile and lagging systems was carried out. Then,basing the experimental results a three-dimensional sliding wedge model was established. Last,the calculation process of the total active force on lagging is presented based on the kinematic approach of limit analysis. A comparison is made between the total active force on lagging calculated by the formula presented in this study and the force on a same-size rigid retaining wall obtained from Rankine＇s theory. It is found that the proposed method fits well with the experimental results.Parametric studies show that the total active force on lagging increases with the growth of the lagging height and the lagging clear span; while decreases asthe soil internal friction angle and soil cohesion increase.
Perennial aneuploidy as a potential material for gene introgression between maize and Zea perennis FU Jie, YANG Xiu-yan, CHENG Ming-jun, L Gui-hua, WANG Pei, WU Yuan-qi, ZHENG Ming-min, ZHOU Shu-feng, RONG Ting-zhao, TANG Qi-lin (State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou 310006, P.R.China)
Journal of Integrative Agriculture,
05/2015, Letnik:
14, Številka:
5
Journal Article
Recenzirano
Odprti dostop
Hybridization,which allows for gene flow between crops,is difficult between maize and Zea perennis.In this study,we aim to initiate and study gene flow between maize and Z.perennis via a special ...aneuploid plant（MDT） derived from an interspecific hybrid of the two species.The chromosome constitution and morphological characters of MDT as well as certain backcross progenies were examined.Results from genomic in situ hybridization（GISH） indicate that aneuploid MDT consisted of nine maize chromosomes and 30 Z.perennis chromosomes.The backcross progenies of MDTxmaize displayed significant diversity of vegetative and ear morphology;several unusual plants with specific chromosome constitution were founded in its progenies.Some special perennial progeny with several maize chromosomes were obtained by backcrossing MDT with Z.perennis,and the first whole chromosome introgression from maize to Z.perennis was detected in this study.With this novel material and method,a number of maize-tetraploid teosinte addition or substitution lines can be generated for further study,which has great significance to maize and Z.perennis genetic research,especially for promoting introgression and transferring desirable traits.
We report a series of 164 patients who underwent phrenic neurotization to elements of the brachial plexus with root avulsion injuries. Recipient nerves included musculocutaneous nerve in 125 patients ...(78 direct neurotizations and 48 with intervening autograft), median nerve in 10 patients, and a variety of other nerves in 28 patients. Sixty-five patients presented a follow-up period of 2 or more years. Of this group, 55 patients (84.6%) achieved a recovery of M-3 or better. We observed no long-term deleterious effects on respiratory function.
Bio-inspired nanogels were prepared by ionically crosslinking sodium tripolyphosphate (TPP) and biomimetic phosphorylcholine-chitosan derivative (PCCs) which was synthesized from chitosan and cell ...membrane-mimicking phosphorylcholine. The physcochemical properties of PCCs/TPP nanogels were investigated by dynamic laser scattering and transmission electron microscopy, as well as their hemocompatibility were tested. Bovine serum albumin was used as a model protein to study protein adsorption, loading and releasing property of these nanogels in vitro. The results indicated that biomimetic PCCs/TPP nanogels can not only restrain the non-specific protein adsorption, improve the hemocompatibility, but also have good loading and releasing protein efficacy, which will be a promising nanocarrier for protein drug delivery.
Gastric cancer(GC)is the second leading cause of cancer-related death.The poor survival rate may reflect the relatively aggressive tumor biology of GC.Recently,the importance of the tumor ...microenvironment in carcinogenesis has emerged.In the tumor microenvironment,tumor cells and the surrounding stromal cells aberrantly secrete matricellular proteins capable of modulating carcinogenesis and regulating metastasis.The Cyr61/CTGF/Nov(CCN)proteins are a family of matricellular proteins with variable roles in many physiological and pathological processes.The evidence suggests that CCN family proteins contribute to GC carcinogenic processes.Here,we briefly review recent research on the effects of CCN family proteins in GC carcinogenesis and the development of new targeted agents in this field.
The blood supply, venous drainage, and innervation of the lateral skin flap of the leg were studied in 52 fresh specimens by dissection, angiography, and selected injection of cutaneous arteries with ...india ink. This flap has a long vascular pedicle that contains the peroneal artery and vein and their branches. The diameter of the peroneal artery is about 3.7 mm. There are 4 to 7 cutaneous branches that penetrate the posterior intermuscular septum and widely anastomose with each other in the subcutaneous tissue. The skin area supplied by the peroneal artery measures approximately 32 X 15 cm. There are 2 sets of veins in the flap: (1) 2 deep veins, the peroneal veins, are about 4 mm in diameter, and (2) a superficial vein, the small saphenous vein, is about 3.3 mm in diameter. The cutaneous nerve is the lateral sural cutaneous nerve. This new lateral skin flap of the leg may be used either as a free flap or as a cutaneous flap and has been proven successful clinically.
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