Construction and Hierarchical Self-Assembly of a Supramolecular Metal-Carbene Complex with Multifunctional Units.

Hierarchical combinations involving metal-ligand interactions and host-guest interactions can consolidate building blocks with unique functions into material properties. This study reports the construction and hierarchical self-assembly of multifunctional trinuclear Au tricarbene complex containing three crown ether units and three ferrocene units. Host-guest interactions between the multifunctional trinuclear Au tricarbene complex and organic ammonium salts were investigated, revealing that crown ether-based host-guest interactions can effectively regulate the electrochemical properties of the complex.

A Comparative Analysis of Methods for Titering Reovirus.

Background: A key challenge in the process of virus amplification is the need for a simple and convenient method for measuring virus titers.

Objective: Real-time unlabeled cell analysis (RTCA) was used to establish a standard curve of correlation between half-cell index time (CIT) and virus titer. At the same time, the virus titer from tunable resistance pulse detection (TRPS) technology was compared with the traditional median tissue culture infectious dose (TCID) method to evaluate the feasibility and application value of the RTCA technique and TRPS technology.

N-Heterocyclic Carbene as a Surface Platform for Assembly of Homochiral Metal-Organic Framework Thin Films in Chiral Sensing.

N-heterocyclic carbenes (NHCs) have attracted increasing attention on surface assembly due to their strong metal binding property, but an NHC-modified metal surface as a new growth platform to assemble other functional materials is still a challenge. Here, we report the preparation and chiral sensing properties of homochiral metal-organic framework thin films on carboxyl-containing NHC self-assembled monolayer-modified gold (Au(NHC)) substrates. By using a liquid-phase epitaxial layer-by-layer method, enantiopure [Cu(cam)dabco] thin films with preferred [110] crystal orientation have been successfully grown on Au(NHC) surfaces.

[Effects of no-tillage, mulching, and organic fertilization on soil fungal community composition and diversity].

We examined the responses of soil fungal community to no-tillage, mulching, and organic fertilization by setting up different treatments for three years in winter wheat land in mountain areas of southern Ningxia, including no-tillage, mulching and organic fertilization (NF), no-tillage, mulching and no organic fertilization (NC), conventional tillage without mulching and organic fertilization (TF), and conventional tillage without mulching and no organic fertilization (TC). Based on Illumina Miseq high-throughput sequencing platform, the relationship between the composition and diversity of soil fungal community and soil environmental factors were examined. A total of 3490 fungal OTUs were obtained from four treatments, which included some unidentified or unknown fungi.

Backbone-Directed Self-Assembly of Interlocked Molecular Cyclic Metalla[3]Catenanes.

The efficient backbone-directed self-assembly of cyclic metalla[3]catenanes by the combination of tetrachloroperylenediimide (TCPDI)-based dinuclear rhodium(III) clips and 4,4'-diazopyridine or 4,4'-dipyridylethylene ligands is realized in a single-step strategy. The topology and coordination geometry of the cyclic metalla[3]catenanes are characterized by NMR spectroscopy, ESI-TOF-MS spectrometry, UV/Vis-NIR spectroscopy, and X-ray diffraction studies. The most remarkable feature of the formed cyclic metalla[3]catenane is that it contains π-aggregates (ca.

Supramolecular Construction of a [16]-Imidazolium Cage via a Quadruple [2+2] Photocycloaddition and Its Selective Fluorescent Recognition of Pyranine (HPTS).

Polyimidazolium-based cages are considered promising materials based on their fascinating properties and potential applications. These three-dimensional functional structures are highly desirable for the recognition of particular guest molecules, however, their synthesis remains challenging. In this work, we have designed and synthesizes a pure [n]-imidazolium (n=16) cage, the hexadecakisimidazolium salt H -2(PF ) , from tetragonal octakisimidazolium salt H -1(PF ) .

Strategy for the Construction of Diverse Poly-NHC-Derived Assemblies and Their Photoinduced Transformations.

A series of supramolecular assemblies of types [Ag (L) ](PF ) and [Ag (L) ](PF ) , obtained from the tetraphenylethylene (TPE) bridged tetrakis(1,2,4-triazolium) salts H -L(PF ) and Ag ions, is described. The assembly type obtained dependends on the N-wingtip substituents of H -L(PF ) . Changes in the lengths of the N4-wingtip substituents enables controlled formation of assemblies with either [Ag (L) ](PF ) or [Ag (L) ](PF ) stoichiometry.

[Effects of maize straw returning on arbuscular mycorrhizal fungal community structure in soil].

To understand the effects of agricultural management activities on soil arbuscular mycorrhizal (AM) fungi diversity, the high-throughput sequencing based on Illumina MiSeq platform, and the fatty acids fingerprints were used to examine the effects of maize straw returning on soil arbuscular mycorrhizal fungi. The relationships between AM fungal community composition, AM fungal biomass and soil factors after maize straw returning were examined for four continuous years. A total of 2430 operational taxonomic units (OTUs) of AM fungi were classified into 10 genera and 143 species, respectively, which belonged to 1 phylum, 3 classes, 4 orders, 8 families.

Supramolecular Control of Photocycloadditions in Solution: In Situ Stereoselective Synthesis and Release of Cyclobutanes.

A new class of supramolecular metallacycles capable of undergoing photochemical reactions and in situ release of cyclobutanes in solution is described. The molecular metallacycles were generated through coordination-driven self-assembly of dinuclear metal-carbene complexes as organometallic clips with olefin-functionalized bridging ligands. Photolysis of these molecular metallacycles in situ led to structural interconversion and release of the formed cyclobutane products with quantitative conversion.

BRCA1 affects the resistance and stemness of SKOV3-derived ovarian cancer stem cells by regulating autophagy.

Breast cancer 1 (BRCA1) and autophagy both play a significant role in drug resistance. However, little is known about the dynamic cross talk between BRCA1 and autophagy in the regulation of drug sensitivity. Here, we investigated the drug resistance-associated regulation of BRCA1 in epithelial ovarian cancer stem cells (EOCSCs).

[Effect of intensive glucose control during peri-operative period on prognosis of patients undergoing cardiac surgery: a Meta-analysis].

Objective: To systematically review the literature to determine the effects of intensive versus normal glycaemic control during peri-operative period on prognosis of patients undergoing cardiac surgery.

Methods: The literature was systematically reviewed based on searching criteria established by Cochrane Collaboration. PubMed database searching was conducted for literature and the language was limited to English.

[Mass chromatographic analysis on different protein expression of human periodontal ligament cell under static pressure].

Purpose: To analyze the protein expression of human periodontal ligament cells (HPDLCs) under static pressure.

Methods: The proteins of two groups of human periodontal ligament cell (one group was interfered by static pressure and one group was not) were analyzed by two-dimensional electrophoresis and mass chromatographic analysis. The silver stained proteins spots were analyzed by Image Master 2D Platinum Software 5.