Destructive Adsorption of Nitrogen Trifluoride (NF) Using M-MOF-74 with Open Metal Sites.

Using solid adsorbents for the destructive sorption of nitrogen trifluoride (NF) presents a potential solution to its dual challenges as a potent greenhouse gas and hazardous compound in microelectronics. In this study, a series of MOFs (M-MOF-74, M = Mg, Co, Ni, Zn) with open metal sites (OMSs) are utilized for NF adsorption. By employing single-component adsorption isotherms and the ideal adsorbed solution theory (IAST) selectivity calculations, the adsorption performance of various adsorbents is evaluated.

Highly Tunable 2D Silicon Quantum Dot Array with Coupling beyond Nearest Neighbors.

Scaling up quantum dots to two-dimensional (2D) arrays is a crucial step for advancing semiconductor quantum computation. However, maintaining excellent tunability of quantum dot parameters, including both nearest-neighbor and next-nearest-neighbor couplings, during 2D scaling is challenging, particularly for silicon quantum dots due to their relatively small size. Here, we present a highly controllable and interconnected 2D quantum dot array in planar silicon, demonstrating independent control over electron fillings and the tunnel couplings of nearest-neighbor dots.

Alloying One-Dimensional Coordination Polymers To Create Ductile Materials.

The preparation of coordination polymer (CP) alloys is demonstrated by the use of two meltable, one-dimensional crystal structures via melt-kneading. The polymer structures of the alloys are studied by synchrotron X-ray absorption and scattering, solid-state NMR spectroscopy, DSC, and viscoelastic measurements. Crystalline and amorphous domains and thermal properties (melting and glass transition) in the alloys depend on the ratio of the two constituent CPs.

Insight into the Gas-Induced Phase Transformations in a 2D Switching Coordination Network via Coincident Gas Sorption and PXRD.

Switching coordination networks (CNs) that reversibly transform between narrow or closed pore (cp) and large pore (lp) phases, though fewer than their rigid counterparts, offer opportunities for sorption-related applications. However, their structural transformations and switching mechanisms remain underexplored at the molecular level. In this study, we conducted a systematic investigation into a 2D switching CN, [Ni(bpy)(NCS)], sql-1-Ni-NCS (1 = bpy = 4,4'-bipyridine), using coincident gas sorption and powder X-ray diffraction (PXRD) under low-temperature conditions.

Ethane/Ethylene Separations in Flexible Diamondoid Coordination Networks via an Ethane-Induced Gate-Opening Mechanism.

Separating ethane (CH) from ethylene (CH) is an essential and energy-intensive process in the chemical industry. Here, we report two flexible diamondoid coordination networks, and , that exhibit gate-opening between narrow-pore (NP) and large-pore (LP) phases for CH, but not for CH. thereby exhibited a type F-IV isotherm at 273 K with no CH uptake and a high uptake (111 cm g, 1 atm) for the NP and LP phases, respectively.

Metal Doping to Control Gate Opening and Increase Methane Working Capacity in Isostructural Flexible Diamondoid Networks.

Adsorbed natural gas (ANG) systems involve using porous materials to increase the working capacity and/or reduce the storage pressure compared to compressed natural gas (CNG). Flexible metal-organic materials (FMOMs) are particularly interesting in this context since their stepped isotherms can afford increased working capacity if the adsorption/desorption steps occur within the proper pressure range. We report herein that metal doping in a family of isostructural FMOMs, ML (M=Co, Ni or Ni Co , L=4-(4-pyridyl)-biphenyl-4-carboxylic acid), enables control over the gate opening between non-porous (closed) and porous (open) phases at pressures relevant to methane storage.

Amino-Functionalized Microporous MOFs for Capturing Greenhouse Gases CF and NF with Record Selectivity.

The capture and separation of fluorinated gases (F-gases) from N has the potential to not only reduce greenhouse gas emissions but also provide economic benefits for the semiconductor industry. In this work, two Ni-based metal-organic frameworks (MOFs), (Ni(ina), ina = isonicotinic acid) and amine-functionalized (Ni(3-ain), 3-ain = 3-aminoisonicotinic acid), were constructed for capturing F-gases (CF and NF). At ambient conditions, both materials exhibit very high CF sorption capacities (2.

Pore-Structure Control in Metal-Organic Frameworks (MOFs) for Capture of the Greenhouse Gas SF with Record Separation.

In the electronics industry, the efficient recovery and capture of sulfur hexafluoride (SF ) from SF /N mixtures is of great importance. Herein, three metal-organic frameworks with fine-tuning pore structures, Cu(peba) , Ni(pba) , and Ni(ina) , were designed for SF capture. Among them, Ni(ina) has perfect pore sizes (6 Å) that are comparable to the kinetic diameter of sulfur hexafluoride (5.

Complete genome sequence of a novel arlivirus from a yellow spotted stink bug (Erthesina fullo (Thunberg, 1783)).

Arlivirus is currently the only genus in the newly established viral family Lispiviridae. In this study, the complete genome sequence of a novel arlivirus, tentatively named "Nbu stink bug virus 1" (NbuSBV-1), was identified in an individual yellow spotted stink bug, Erthesina fullo (family Pentatomidae, order Hemiptera), which is a widely distributed phytophagous pest in Asia. NbuSBV-1 has a single negative-stranded RNA genome of 13,605 nucleotides in length, and it was predicted to contain six open reading frames (ORFs).

Nickel-Based Metal-Organic Frameworks for Coal-Bed Methane Purification with Record CH /N Selectivity.

The enrichment and purification of coal-bed methane provides a source of energy and helps offset global warming. In this work, we demonstrate a strategy involving the regulation of the pore size and pore chemistry to promote the separation of CH /N mixtures in four nickel-based coordination networks, named Ni(ina) , Ni(3-ain) , Ni(2-ain) , and Ni(pba) , (where ina=isonicotinic acid, 3-ain=3-aminoisonicotinic acid, 2-ain=2-aminoisonicotinic acid, and pba=4-(4-pyridyl)benzoic acid). Among them, Ni(ina) and Ni(3-ain) can effectively separate CH from N with top-performing performance because of the suitable pore size (≈0.

Urinary modified nucleosides as novel biomarkers for diagnosis and prognostic monitoring of urothelial bladder cancer.

Aims And Background: To ascertain the value of the detection of urinary modified nucleosides in the early diagnosis and prognostic monitoring of urothelial bladder cancer.

Methods: One hundred seventeen patients with urothelial bladder carcinoma and 66 healthy volunteers were included in the study. High-performance liquid chromatography/electrospray ionization quadrupole time-of-flight mass spectrometry (HPLC/ESI-Q-TOF-MS) was used to measure the levels of urinary modified nucleosides in the bladder cancer and control groups.

Multiple scalp metastases from colonic neuroendocrine carcinoma: case report and literature review.

Background: Colonic neuroendocrine neoplasms (NENs) are relatively rare tumors with an incidence rate of 0.11-0.21/100,000.

ESIMS and NMR studies on the selective deprotection of acetylated glucosides by dibutyltin oxide.

The reaction process for the selective deprotection of acetylated glucosides by dibutyltin oxide in methanol is investigated by using methyl 2,3,4,6-tetra-O-acetyl-α-d-glucopyranoside as a model substrate with ESIMS and NMR techniques. According to the results, it is inferred that at first, dimeric 1,3-dimethoxytetrabutyldistannoxane is formed by the reaction of dibutyltin oxide with methanol, and then the tetraorganodistannoxane reacts with the acetylated glucoside to produce glucoside-organotin complex intermediates. Finally, the complex intermediates are hydrolyzed leading to the free-OH glucoside and organotin acetate derivatives.

[Effect of COX-2 inhibitor on the expression of BCL-3 and cyclin D1 in human colon cancer cell line SW480].

Objective: To study the effects of NS398, a selective cyclooxygenase-2 (COX-2) inhibitor, on the transcription and translation of BCL-3 and its regulatory gene cyclin D1 in colon cancer cell line SW480.

Methods: Human colon cancer cells SW480 were divided into two groups: SW480 cells in experimental group were treated with NS398 in different concentrations(25 micromol/L, 50 micromol/L, 100 micromol/L and 200 micromol/L) for 48 h or 72 h. SW480 cells in control group were treated with media which did not contain NS398.

Separation and characterization of clindamycin phosphate and related impurities in injection by liquid chromatography/electrospray ionization mass spectrometry.

A simple high-performance liquid chromatography/electrospray ionization tandem mass spectrometric (HPLC/ESI-MS/MS) method has been developed for the rapid identification of clindamycin phosphate and its degradation products or related impurities in clindamycin phosphate injection. Detection was performed by quadrupole time-of-flight mass spectrometry (Q-TOFMS) via an ESI source in positive mode. Clindamycin phosphate and its related substances lincomycin, 7-epilincomycin-2-phosphate, lincomycin-2-phosphate, clindamycin B, clindamycin B-2-phosphate, and clindamycin were identified simultaneously by HPLC/ESI-MS/MS results.

Separation and identification of purine nucleosides in the urine of patients with malignant cancer by reverse phase liquid chromatography/electrospray tandem mass spectrometry.

Urinary-modified nucleosides have a potential role as cancer biomarkers for a number of malignant diseases. High performance liquid chromatography (HPLC) was combined with full-scan mass spectrometry, MS/MS analysis and accurate mass measurements in order to identify purine nucleosides purified from urine. Potential purine nucleosides were assessed by their evident UV absorbance in the HPLC chromatogram and then further examined by the mass spectrometric techniques.

Analysis of modified nucleosides in the urine of patients with malignant cancer by liquid chromatography/electrospray ionization mass spectrometry.

As modified nucleosides reflect altered tRNA turnover which seems to be impaired in the body of cancer patients, they have been evaluated as potential tumor markers. High-performance liquid chromatography/electrosprary ionization quadrupole time-of-flight mass spectrometry (HPLC/ESI-Q-TOFMS) was used to identify nucleosides purified from urine in positive ionization mode. Potential nucleosides were assessed by their evident UV absorbance in HPLC and then further examined by mass spectrometric techniques.

[Effects of low temperature and weak light on the functions of photosystem in Prunus armeniaca L. leaves in solar greenhouse].

In this paper, the net photosynthetic rate (Pn), actual photochemical efficiency of PS II (PhiPSII), photochemical quenching (qp), and maximal photochemical efficiency of PS II in light (Fv'/Fm') of apricot (Prunus armeniaca) leaves in solar greenhouse were measured, and the effects of low temperature (7 degrees C) and weak light (200 micromol x m(-2) x s(-1) PFD) on the photoinhibition of PS I and PS II were investigated. The results showed that the optimal temperature for the photosynthesis of apricot leaves was around 25 degrees C, and the photosynthetic capacity was reduced greatly by the low temperature and weak light, inducing a markedly increased excitation press (1-qp) and in turn, resulting in photoinhibition. The functions of both PS I and PS II were damaged by the low temperature and weak light.

Mild and selective deprotection method of acetylated steroids and diterpenes by dibutyltin oxide.

Dibutyltin oxide (DBTO) was first utilized for the deacetylation of steroid and diterpene esters. The results showed the deprotection of acetylated steroids and diterpenes separately with moderate catalysis dibutyltin oxide in methanol selectively removed part acetyl groups of these substrates, whereas several functional groups of the steroids and diterpenes were retained and neither isomerization nor degradation of these substrates was observed. It seems that the acetyl groups with lower steric hindrance or near carbonyl, alkoxy, or hydroxyl groups can be cleaved by the reaction, whereas the acetyl groups with higher steric hindrance or without carbonyl, alkoxy, or hydroxyl groups neighboring were retained under the same conditions.

Syntheses of acetylated steroid glycosides and selective cleavage of O-acetyl groups in sugar moiety.

Acetylated 3beta-O-beta-glycosyl steroid derivatives were synthesized by the reaction of a new polyhydroxysteroid 3beta,5alpha,6beta-trihydroxypregn-16-en-20-one (2) with the peracetylated 1-bromo derivatives of d-glucose and d-galactose, respectively. Subsequent protection by excess acetic anhydride in pyridine selectively gave the 6beta-O-acetylated steroid glycosides. Deprotection of the acetylated steroid glycosides separately with moderate catalysis dibutyltin oxide in methanol selectively removed all acetyl groups of sugar moiety, whereas the acetyl group of the steroid part was retained.

Characterization of enhancer trap and gene trap harboring Ac/Ds transposon in transgenic rice.

Insertion mutagenesis has become one of the most popular methods for gene functions analysis. Here we report a two-element Ac/Ds transposon system containing enhancer trap and gene trap for gene tagging in rice. The excision of Ds element was examined by PCR amplification.