gebhart/patrepeval huggingface dataset:
Synthesis and characterization of pillared buserite (1992)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of pillared buseriteShe Tin Wong and Soofin ChengCite this: Inorg. Chem. 1992, 31, 7, 1165–1172Publication Date (Print):April 1, 1992Publication History Published online1 May 2002Published inissue 1 April 1992https://pubs.acs.org/doi/10.1021/ic00033a010https://doi.org/10.1021/ic00033a010research-articleACS PublicationsRequest reuse permissionsArticle Views396Altmetric-Citations69LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts
Clay Intercalation of Poly(styrene−ethylene oxide) Block Copolymers Studied by Two-Dimensional Solid-State NMR (2003)

The intercalation of poly(styrene−ethylene oxide) block copolymers (PS-b-PEO) into a smectite clay, hectorite, has been studied by multinuclear solid-state nuclear magnetic resonance (NMR). The behaviors of two copolymers with similar PEO block lengths (7 and 8.4 kDa) but different PS block lengths (3.6 vs 30 kDa) were compared. Polymer intercalation is assessed by two-dimensional 1H−29Si heteronuclear correlation (HETCOR) NMR with spin diffusion and refocused 29Si detection for enhanced sensitivity. Hydroxyl protons in the smectite layers serve as crucial spin diffusion references and 1H magnetization relay points from the polymer to the 29Si in the silicate. Experiments with CRAMPS evolution, with 1H spin diffusion, and with detection of the sharp OH proton signal after a 1H T2 filter provide excellent sensitivity for spin diffusion studies with mixing-time series. Because of the mobility of PEO, in this homonuclear experiment we can observe PEO−PS and clay−polymer spin diffusion simultaneously. While the PS block is found not to be intercalated in either copolymer, definite proof of PEO intercalation in the sample with the shorter, 3.6 kDa PS block is provided by a 1H−13C HETCOR spectrum. In the PS-rich sample, the amount of intercalated PEO is much smaller, and a significant fraction of PEO is not intercalated. Two-dimensional 1H−29Si correlation NMR without 1H homonuclear decoupling shows that intercalated PEO has a clearly reduced mobility, most prominently for the PEO nearest to the silicate surface. A model of the PEO blocks intercalating sideways into 50 nm diameter stacks of hectorite can explain the experimental results.
A Successful Field Application of a New Chemical Treatment in a Fluid Blocked Well in Saudi Arabia (2013)

ABSTRACT A successful trial of the Gas Well Stimulant WS-1200 was recently completed on a gas well with high Condensate-Gas Ratio (CGR) and producing below the dew point to treat fluid blockage in Saudi Arabia. The treatment consisted of pumping from a surface 2 wt% active solution in common organic solvents that solubilizes and/or displaces the brine and condensate that are present in the near wellbore region of a fluid blocked well. After bullheading the treatment into the well, it was chased with two equivalents of nitrogen gas. The well was shut-in over night for the treatment to react and then the well was opened to flow and clean out. A test separator was connected to measure the flow at surface and compare the flow after the treatment. Several days were required after opening the well to back-produce the solvents and evaluate the well through the test separator until stabilization was acquired. The well was put back online and continued monitoring production for several months. Just prior to injection of the chemical treatment, the well was producing ~1.5 MMSCFD and ~275 BOD. Within five days of concluding the injection, the well was producing ~2.7 MMSCFD and ~1,000 BOD and in an increasing trend. The well was left in production with only the wellhead temperature (WHT) and wellhead pressure (WHP) being monitored on an ongoing basis. After three months of production, the well rate was again measured through a separator at similar conditions and found to be ~2.85 MMSCFD and ~1,152 BOD, a sustained improvement of 83% in gas production and a 313% improvement in oil production. In light of initial encouraging results, similar chemical treatments are planned in other sandstone reservoirs with similar problems.
Precursors for pyromellit-bridged silica sol–gel hybrid materials (2012)

Bridged bis(trialkoxysilylalkyl)pyromellitic diimides 3–6 were prepared as single-source precursors for sol–gel derived organic–inorganic hybrid materials. The synthesis route starts with the formation pyromellit diimide 1 from pyromellitic dianhydride and hexamethyldisilazane (HMDS), followed by metallation of the NH groups to give the dipotassium salt 2. The four molecular hybrid precursors 3–6 were obtained according to the first step of the Gabriel synthesis. The reaction rates were studied as a function of the alkyl chain length and the nature of the halide (Cl vs. I). All products 1–6 were comprehensively analysed using FT-IR, 1H and 13C NMR spectroscopy as well as elemental analysis, and – in the case of 3–6 – also with 29Si NMR spectroscopy. For compounds 3 (with propylene groups and methoxy substituents) and 6 (with methylene groups and ethoxy substituents) single crystal X-ray structures were determined and discussed. Hydrolysis and condensation of the alkoxides 3–6 were carefully monitored with solution 29Si and 1H NMR spectroscopy providing a basis for further studies on the formation of silica-pyromellit organic–inorganic hybrids from precursors 3–6. Finally the formation of flexible and transparent hydride films using precursors 4 and 6 was proved.
‘Movers and shakers’ in the regulation of fruit ripening: a cross-dissection of climacteric versus non-climacteric fruit (2014)

Fruit ripening is a complex and highly coordinated developmental process involving the expression of many ripening-related genes under the control of a network of signalling pathways. The hormonal control of climacteric fruit ripening, especially ethylene perception and signalling transduction in tomato has been well characterized. Additionally, great strides have been made in understanding some of the major regulatory switches (transcription factors such as RIPENING-INHIBITOR and other transcriptional regulators such as COLOURLESS NON-RIPENING, TOMATO AGAMOUS-LIKE1 and ETHYLENE RESPONSE FACTORs), that are involved in tomato fruit ripening. In contrast, the regulatory network related to non-climacteric fruit ripening remains poorly understood. However, some of the most recent breakthrough research data have provided several lines of evidences for abscisic acid- and sucrose-mediated ripening of strawberry, a non-climacteric fruit model. In this review, we discuss the most recent research findings concerning the hormonal regulation of fleshy fruit ripening and their cross-talk and the future challenges taking tomato as a climacteric fruit model and strawberry as a non-climacteric fruit model. We also highlight the possible contribution of epigenetic changes including the role of plant microRNAs, which is opening new avenues and great possibilities in the fields of fruit-ripening research and postharvest biology.
Purification of human secretory pregnancy-associated endometrial α2-globulin (α2-PEG) from cytosol of first trimester pregnancy endometrium (1986)

Pregnancy-associated endometrial alpha 2-globulin (alpha 2-PEG), the major secretory protein as assessed by in-vitro synthesis and secretion by the endometrium during the luteal phase of the menstrual cycle and early first trimester of pregnancy, has been purified from the cytosolic fraction of pregnancy endometrium. The purification schedule involved anion exchange chromatography (DE52), gel filtration (Sephacryl S-200), concanavalin A-Sepharose, chromatofocusing and negative immunoaffinity chromatography. On anion exchange chromatography alpha 2-PEG eluted at 0.11 M NaCl, on Sephacryl S-200 with an apparent Mr of 56 K, it bound to concanavalin A and eluted from a chromatofocusing column at a pH of 4.6. alpha 2-PEG was isolated with 98% purity, as assessed by one-dimensional sodium dodecyl sulphate (SDS)-gradient polyacrylamide gel electrophoresis (subunit Mr under reducing conditions 28 K), and a yield of 0.11 mg per g wet weight tissue. This purified alpha 2-PEG should enable in-vitro assessment of the function of this unique protein in implantation and pregnancy and provide antigenic material for the development of a radioimmunoassay.
CYCLOPS, a mediator of symbiotic intracellular accommodation (2008)

The initiation of intracellular infection of legume roots by symbiotic rhizobia bacteria and arbuscular mycorrhiza (AM) fungi is preceded by the induction of calcium signatures in and around the nucleus of root epidermal cells. Although a calcium and calmodulin-dependent kinase (CCaMK) is a key mediator of symbiotic root responses, the decoding of the calcium signal and the molecular events downstream are only poorly understood. Here, we characterize Lotus japonicus cyclops mutants on which microbial infection was severely inhibited. In contrast, nodule organogenesis was initiated in response to rhizobia, but arrested prematurely. This arrest was overcome when a deregulated CCaMK mutant version was introduced into cyclops mutants, conferring the development of full-sized, spontaneous nodules. Because cyclops mutants block symbiotic infection but are competent for nodule development, they reveal a bifurcation of signal transduction downstream of CCaMK. We identified CYCLOPS by positional cloning. CYCLOPS carries a functional nuclear localization signal and a predicted coiled-coil domain. We observed colocalization and physical interaction between CCaMK and CYCLOPS in plant and yeast cell nuclei in the absence of symbiotic stimulation. Importantly, CYCLOPS is a phosphorylation substrate of CCaMK in vitro. Cyclops mutants of rice were impaired in AM, and rice CYCLOPS could restore symbiosis in Lotus cyclops mutants, indicating a functional conservation across angiosperms. Our results suggest that CYCLOPS forms an ancient, preassembled signal transduction complex with CCaMK that is specifically required for infection, whereas organogenesis likely requires additional yet-to-be identified CCaMK interactors or substrates.
Inhibition of chemical sputtering of organics and C by trace amounts of Cu surface contamination (1976)

Chemical sputtering is the reaction of an excited reactive gas with a solid surface to form a volatile compound. In rf sputter-etching processes, in which an oxygen glow discharge is often used to remove organic masking materials, the presence of 5–6% surface coverage of organic materials by Cu reduces the chemical sputter-etch rate of the organic material by several orders of magnitude. The physical sputter-etch rate of such surfaces is reduced by a factor of about 10. The effect occurs both in glow discharge and ion-beam sputtering. The Cu clusters apparently have a very low sputtering yield, resulting in local masking and the formation of cones. It is postulated that local field enhancement at the tips of the cones diverts incoming oxygen ions toward the tips and away from exposed organic material, leading to a lower chemical sputter-etch rate.
First Autologous Cell Therapy of Cerebral Palsy Caused by Hypoxic-Ischemic Brain Damage in a Child after Cardiac Arrest—Individual Treatment with Cord Blood (2013)

Each year, thousands of children incur brain damage that results in lifelong sequelae. Therefore, based on experimental evidence, we explored the therapeutic potential of human cord blood, known to contain stem cells, to examine the functional neuroregeneration in a child with cerebral palsy after cardiac arrest. The boy, whose cord blood was stored at birth, was 2.5 years old and normally developed when global ischemic brain damage occurred resulting in a persistent vegetative state. Nine weeks later, he received autologous cord blood (91.7 mL, cryopreserved, 5.75 × 10e8 mononuclear cells) intravenously. Active rehabilitation (physio- and ergotherapy) was provided daily, follow-up at 2, 5, 12, 24, 30, and 40 months. At 2-months follow-up the boy's motor control improved, spastic paresis was largely reduced, and eyesight was recovered, as did the electroencephalogram. He smiled when played with, was able to sit and to speak simple words. At 40 months, independent eating, walking in gait trainer, crawling, and moving from prone position to free sitting were possible, and there was significantly improved receptive and expressive speech competence (four-word sentences, 200 words). This remarkable functional neuroregeneration is difficult to explain by intense active rehabilitation alone and suggests that autologous cord blood transplantation may be an additional and causative treatment of pediatric cerebral palsy after brain damage.
Thiazolidinedione compounds: a patent review (2010 – present) (2015)

Diabetes management is very important as the number of diabetic patients increased and therefore the present research article will be very much useful for the development of new molecules.
Directional hearing aids: Then and now (2005)

Directional microphone hearing aids can lead to improved speech recognition when speech and noise are coming from different directions. This technology provides limited benefits, however, and in specific instances use of a directional hearing aid mode can be detrimental. This article discusses the benefits and limitations of directional amplification, summarizes some current work in directional amplification, and recommends clinical application relative to the use of directional amplification.
Antihyperglycemic Activity of Phenolics from <i>Pterocarpus marsupium</i> (1997)

Glucose levels in rats with hyperglycemia induced by streptozotocin were determined after i.p. administration of marsupsin (1), pterosupin (2), and pterostilbene (3), three important phenolic constituents of the heartwood of Pterocarpus marsupium. Marsupsin and pterostilbene significantly lowered the blood glucose level of hyperglycemic rats, and the effect was comparable to that of 1,1-dimethylbiguanide (metformin).
Comprehensive Genomic Profiling Identifies a Subset of Crizotinib-Responsive <i>ALK</i>-Rearranged Non-Small Cell Lung Cancer Not Detected by Fluorescence In Situ Hybridization (2016)

Comprehensive genomic profiling (CGP) that includes hybrid capture and specific baiting of intron 19 of ALK is a highly sensitive, alternative method for identification of drug-sensitive ALK fusions in patients with non-small cell lung cancer (NSCLC) who had previously tested negative using standard ALK fluorescence in situ hybridization (FISH) diagnostic assays. Given the proven benefit of treatment with crizotinib and second-generation ALK inhibitors in patients with ALK fusions, CGP should be considered in patients with NSCLC, including those who have tested negative for other alterations, including negative results using ALK FISH testing.
Supercritical Carbon Dioxide and Its Potential as a Life-Sustaining Solvent in a Planetary Environment (2014)

Supercritical fluids have different properties compared to regular fluids and could play a role as life-sustaining solvents on other worlds. Even on Earth, some bacterial species have been shown to be tolerant to supercritical fluids. The special properties of supercritical fluids, which include various types of selectivities (e.g., stereo-, regio-, and chemo-selectivity) have recently been recognized in biotechnology and used to catalyze reactions that do not occur in water. One suitable example is enzymes when they are exposed to supercritical fluids such as supercritical carbon dioxide: enzymes become even more stable, because they are conformationally rigid in the dehydrated state. Furthermore, enzymes in anhydrous organic solvents exhibit a "molecular memory", i.e., the capacity to "remember" a conformational or pH state from being exposed to a previous solvent. Planetary environments with supercritical fluids, particularly supercritical carbon dioxide, exist, even on Earth (below the ocean floor), on Venus, and likely on Super-Earth type exoplanets. These planetary environments may present a possible habitat for exotic life.
Autolysis and intracellular enzyme release from cheese related dairy lactobacilli (1998)

The abiIity of Lactobacillus helveticus, Lb. delbrueckii subsp. bulgaricus, Lb. delbrueckii subsp. lactis, Lb. casei, Lb. plantarum, Lb. fermentum and Lb. brevis to lyse under various conditions of temperature, sodium chloride concentration and pH was investigated. Intracellular enzymes released from the cells in vitro and in a cheese system were also considered. A temperature close to the optimun temperature for growth, a pH varying from 5.5 to 6.5 and a sodium chloride concentration varying from 0.5 to 1.0 M as weil as a freezing and thawing treatment seem to be the optimal conditions for cell autolysis. Enzymes release in vitro and in the cheese were found to be related to the rate of autolysis of the cells. InralElsevier, Paris autolysis / Lactobacillus / aminopeptidase / ripening / cheese Rsum -Autolyse et relargage des enzymes intracellulaires des lactobacilles apparents au fromage. L'autolyse des bactries Lactobacillus helveticus, Lb. delbrueckii subsp. bulgaricus, Lb. delbrueckii subsp. lactis, Lb. casei, Lb. plantarum, Lb. fermentum et Lb. brevis a t tudie dans des conditions diffrentes de temprature, pH, et concentration en chlorure de sodium. Le relargage des activits enzymatiques in vitro et dans un fromage modle a aussi t pris en considration. Les rsultats obtenus montrent qu'une temprature proche de la temprature optimale de croissance de la bactrie, un pH variant de 5,5 6,5 selon les souches, ainsi qu'un traitement de conglation/dconglation sembleraient tre les conditions optimales pour l'autolyse des cellules de Lactobacillus tudies. Il a aussi t dmontr que les souches montrant une forte autolyse rel arguent leurs enzymes intracellulaires plus rapidement dans le caill. InralElsevier, Paris autolyse / Lactobacillus / aminopeptidase / affinage / fromage
Tagged Repair Techniques for Defect Tolerance in Hybrid Nano/CMOS Architecture (2010)

We propose two new repair techniques for hybrid nano/CMOS computing architecture with lookup-table-based Boolean logic. Our proposed techniques use tagging mechanism to provide high level of defect tolerance, and we present theoretical equations to predict the repair capability, including an estimate of the repair cost. The repair techniques are efficient in utilization of spare units and capable of targeting up to 20% defect rates, which is higher than recently reported repair techniques.
LoRa-MAB: A Flexible Simulator for Decentralized Learning Resource Allocation in IoT Networks (2019)

LoRaWAN is a media access control (MAC) protocol for wide area networks. It is designed to allow low-powered devices to communicate with Internet-connected applications over long-range wireless connections. The targeted dense deployment will inevitably cause a shortage of radio resources. Hence, autonomous and lightweight radio resource management is crucial to offer ultra-long battery lifetime for LoRa devices. One of the most promising solutions to such a challenge is the use of artificial intelligence. This will enable LoRa devices to use innovative and inherently distributed learning techniques, thus freeing them from draining their limited energy by constantly communicating with a centralized controller.Before proceeding with the deployment of self-managing solutions on top of a LoRaWAN application, it is sensible to conduct simulation-based studies to optimize the design of learning-based algorithms as well as the application under consideration. Unfortunately, a network simulator for such a context is not fully considered or lacks real deployment parameters. In order to address this shortcoming, we have developed an event-based simulator for resource allocation in LoRaWAN. To demonstrate the usefulness of our simulator, extensive simulations were run in a realistic environment taking into account physical phenomenon in LoRaWAN such as the capture effect and inter-spreading factor interference. The simulation results show that the proposed simulator provides a flexible and efficient environment to evaluate various network design parameters and self-management solutions as well as verify the effectiveness of distributed reinforcement-based learning algorithms for resource allocation problems in LoRaWAN.
Lineage restriction of the myogenic conversion factor <i>myf-5</i> in the brain (1995)

myf-5 is one of four transcription factors belonging to the MyoD family that play key roles in skeletal muscle determination and differentiation. We have shown earlier by gene targeting nlacZ into the murine myf-5 locus that myf-5 expression in the developing mouse embryo is closely associated with the restriction of precursor muscle cells to the myogenic lineage. We now identify unexpected expression of this myogenic factor in subdomains of the brain. myf-5 expression begins to be detected at embryonic day 8 (E8) in the mesencephalon and coincides with the appearance of the first differentiated neurons; expression in the secondary prosencephalon initiates at E10 and is confined to the ventral domain of prosomere p4, later becoming restricted to the posterior hypothalamus. This expression is observed throughout embryogenesis. No other member of the MyoD family is detected in these regions, consistent with the lack of myogenic conversion. Furthermore, embryonic stem cells expressing the myf-5/nlacZ allele yield both skeletal muscle and neuronal cells when differentiated in vitro. These observations raise questions about the role of myf-5 in neurogenesis as well as myogenesis, and introduce a new lineage marker for the developing brain.
Exposed Surfaces on Shape‐Controlled Ceria Nanoparticles Revealed through AC‐TEM and Water–Gas Shift Reactivity (2013)

Aberration-corrected transmission electron microscopy and high-angle annular dark field imaging was used to investigate the surface structures and internal defects of CeO2 nanoparticles (octahedra, rods, and cubes). Further, their catalytic reactivity in the water-gas shift (WGS) reaction and the exposed surface sites by using FTIR spectroscopy were tested. Rods and octahedra expose stable (111) surfaces whereas cubes have primarily (100) facets. Rods also had internal voids and surface steps. The exposed planes are consistent with observed reactivity patterns, and the normalized WGS reactivity of octahedra and rods were similar, but the cubes were more reactive. In situ FTIR spectroscopy showed that rods and octahedra exhibit similar spectra for -OH groups and that carbonates and formates formed upon exposure to CO whereas for cubes clear differences were observed. These results provide definitive information on the nature of the exposed surfaces in these CeO2 nanostructures and their influence on the WGS reactivity.