gebhart/patrepeval huggingface dataset:
A New Family of P,N Chelates:  Stereoselective Synthesis of 2-Pyridyl-2-phospholenes in the Coordination Sphere of Palladium(II) Complexes (2004)

The synthesis of Pd(II) complexes 2a,c‘, bearing 2-(2-pyridyl)phosphole ligands which act as P,N chelates, is described. Ligands featuring a pendant pyridyl group spontaneously evolve to the corresponding 2-pyridyl-2-phospholene derivatives in the coordination sphere of Pd(II). This isomerization is a stereoselective process, the stereochemistry of the resulting derivatives 3a,a‘ being established by X-ray diffraction studies. The isomerization of ligands lacking pendant pyridyl groups was accomplished by adding pyridine to the reaction media. High yields were achieved under very mild conditions for ligands possessing different substitution patterns. Multinuclear NMR spectroscopic data and X-ray diffraction studies showed that the stereoselectivity of the process is preserved under these new reaction conditions. The transformation did not occur with free 2-(2-pyridyl)phospholes, even at high temperatures in the presence of pyridine. DFT calculations confirmed that coordination to a Pd(II) center is required to make this isomerization thermodynamically feasible. The isomerization has also been demonstrated with Pt(II) precursors but failed with CuCl, CuCl2, and ZnCl2. The free 2-pyridyl-2-phospholenes 4a,c‘ were obtained by reacting the complexes 3a,c‘ with dppe. No inversion of the P atom of the phospholene ring was observed up to 90 °C, indicating that this novel family of P,N chelates is a promising class of ligand for homogeneous catalysis.
Photocyclizations. III. Synthesis of 3,6-dimethyl-8-hydroxy-3,4,5,6-tetrahydro-3-benzazocin-2(1H)-one (1973)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotocyclizations. III. Synthesis of 3,6-dimethyl-8-hydroxy-3,4,5,6-tetrahydro-3-benzazocin-2(1H)-oneHelen H. Ong and Everette L. MayCite this: J. Org. Chem. 1973, 38, 5, 924–927Publication Date (Print):March 1, 1973Publication History Published online1 May 2002Published inissue 1 March 1973https://pubs.acs.org/doi/10.1021/jo00945a018https://doi.org/10.1021/jo00945a018research-articleACS PublicationsRequest reuse permissionsArticle Views60Altmetric-Citations9LEARN 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
Evaluation of Binary and Ternary Blends of Pozzolanic Materials Using the Rapid Chloride Permeability Test (2009)

The effect of replacing cement by pozzolanic materials was investigated. This was done by a systematic increase in pozzolanic material inclusion, and was evaluated using the Rapid Chloride Permeability Test. The materials used were fly ash, blast furnace slag (BFS), and silica fume. The blending was at the increasing levels of 25, 50, and 70% of fly ash or BFS, with or without addition of silica fume at 10% cement replacement to form binary and ternary blends. A commonly practiced initial curing regime of seven days was administered. The experimental results obtained in this study were analyzed using statistical methodology. The results indicated that an increase in fly ash content increased the charge passed in the specimens but the reverse trend was observed with increase in the BFS content in the absence of silica fume. Silica fume alone as well as its ternary blend with 25% fly ash showed lower charge when compared with the control or with the binary blend of cement and fly ash. However, in ternary blends containing fly ash at more than 25%, the presence of silica fume did not cause a reduction in the charge. All ternary blends comprising BFS and silica fume passed lower charges than the respective binary blends. These ternary blends exhibited dense microstructure compared to the corresponding binary fly ash blends. The highest percentage replacement of cement with 70% BFS and silica fume was comparable with the addition of silica fume alone. The results showed that concretes with BFS blends exhibit lower charge passed and higher compressive strength than comparative blends using fly ash.
Properties of stabilizers in colloidal dispersions (2002)

Surfactants and polymers are frequently used as stabilizers in colloidal dispersions. Depending on their solubility and the interactions in their local environment, their tendency to remain adsorbed on a surface will differ. These conditions will change upon removal of water from the dispersion, which is reflected in the rate of exchange between free and adsorbed species as well as in the bulk concentration. The aim of this study has been to study the properties of stabilizers in colloidal dispersions with respect to adsorption and kinetics, mainly by means of nuclear magnetic resonance relaxometry and diffusometry. The conformation of adsorbed non-ionic stabilizers was analyzed in terms of NMR relaxation times, where it was found that long oxyethylene chains adsorb in a tail, train, loop conformation, while shorter chains have more rigid conformation. From comparative adsorption studies of nonylphenol ethoxylates with an average of 84 (NP100) and 10 (NP10) oxyethylene units together with polyethylene glycols, the results showed the importance of the hydrophobic group on the conformation. This was also shown from kinetic studies on the rate of adsorption and desorption, where results from NP100 and NP10 showed a 1000 fold difference in residence times, which was a result mainly by the hydrophobic group, but also by the length of the oxyethylene chain. Kinetic studies were also made on concentrated dispersions where it was found that a barrier for desorption existed for NP100, while the adsorption of NP10 was controlled by diffusion, in accordance with the suggested conformation on different surfaces. Furthermore, the mechanisms and the interactions of multiple component adsorption of NP100, sodium dodecylsulfate and polyvinylpyrrolidone on surfaces were investigated. It was found that the associative and segregative behavior of the components in solution also was reflected in the adsorption behavior. Overall, it seemed as if the polymer had less preference to the surface in favor of the mixed combination of the other two components.
The role of kisspeptin in the control of gonadotrophin secretion (2008)

Kisspeptins are pivotal regulators of the HPG axis and reproduction, with the ability to integrate signals from both internal and external sources. Knowledge about the signalling mechanisms involved in kisspeptin stimulation of GnRH would help improve the understanding of the importance of this critical pathway in reproduction.
Total synthesis of indole and dihydroindole alkaloids. XII. Selective functionalization of various bisindoles. Efficient syntheses of leurosine and related bisindole alkaloid derivatives (1978)

Studies involving selective functionalization of the indole unit in a number of bisindole alkaloids and related synthetic derivatives are described. These investigations include such reagents as tert-butyl hydroperoxide, which provides an efficient procedure for epoxidation of olefinic linkages, mercuric acetate, osmium tetroxide, and iodine under basic conditions and oxygenation under acidic conditions. Efficient syntheses of leurosine (8) and various novel vinblastine derivatives are developed.
Smart end effector for dexterous manipulation in space (1992)

A smart end effector has been developed to add dexterous and flexible capabilities to coarse space work systems. It provides fine adjustment for precise error compensation by using a relative proximity sensor and provides delicate force control by using a force-torque sensor. It also automatically tracks a marked target and captures it with specified impedance. A new mechanism using parallel links has been devised for the end effector, and a visual proximity sensor has been developed for six-dimensional position-attitude measurement of a flying target. Attaching the smart end effector to a long arm, experiments have been carried out using a two-dimensional air-bearing test bed, and sufficient performance has been achieved.
GaAs photonic crystals on SiO/sub 2/ fabricated by VHF anode-coupled RIE and wafer bonding (2003)

Semiconductor photonic crystals (PCs) are attracting much attention from the viewpoints of both physical interest and optoelectronic applications that take advantage of controlling optical transitions. In order to make crystals with the photonic band-gaps in the optical wavelength region, it is required to fabricate well-defined periodic structures on the order of the wavelength of light. Furthermore, a confinement structure in the vertical direction is also important in the 2-dimensional (2D) PCs. We have fabricated GaAs 2D PCs on SiO/sub 2/ which are suitable for waveguide applications in the lateral directions.
One-Dimensional Electron Localization and Superconducting Fluctuations in Narrow Aluminum Wires (1984)

We report magnetoresistance studies on narrow aluminum wires of width $0.2 \ensuremath{\mu}\mathrm{m}<W<0.6 \ensuremath{\mu}\mathrm{m}$ which demonstrate clearly for the first time the one-dimensional localization effects predicted by Thouless, where the theory is generalized to include spin-orbit scattering. The electron inelastic-scattering rate is the same as in two-dimensional films, determined by known inelastic mechanisms. The dependence of resistance on temperature for $2 \mathrm{K}<T<20 \mathrm{K}$ is also well explained by the theory.
Pneumatic Component Characterization: Use of Measured Stagnation Pressures (2010)

International audience
Über das glimmerartige Kaliumnickel(II)‐monoarsenat KNiAsO<sub>4</sub> (1979)

Abstract Herstellung (durch Kristallisation aus einer K 2 O · NiO · As 2 O 5 ‐Schmelze) und Eigenschaften des in gelbgrünen, glimmerartigen Lamellen kristallisierenden KNiAsO 4 ( I ) werden beschrieben. Elementarzelle: Trigonal; a = 4,988(1), c = 28,608(8) Å; Z = 6; Raumgruppe R3 oder R 3 . I enthält NiO 6 ‐Koordinationspolyeder und AsO 4 ‐Monoarsenat‐Tetraeder (gemäß Elektronen‐ bzw. IR‐Spektrum). Es wird ein Strukturmodell abgeleitet, nach dem I ein Schichtengitter hat, das aus anionischen koordinationspolymeren Tetraeder/Oktaeder/Tetraeder‐Dreischichtpaketen und aus K + ‐Zwischenschichten aufgebaut ist. I repräsentiert einen neuen ABXO 4 ‐Strukturtyp.
Using a single-ended TRL calibration pattern to de-embed coupled transmission lines (2009)

Transmission line port de-embedding is critical in characterization and modeling for high-speed digital systems. De-embedding technique for single-ended transmission lines has been developed and widely used. However, few de-embedding techniques for coupled transmission lines have been reported in the literature. In this paper, a de-embedding technique for coupled transmission lines using a single-ended TRL (Thru-Reflect-Line) calibration pattern is proposed. It is based on directly obtaining VNA (Vector Network Analyzer) error correction data from measurement and post data processing. As accurate de-embedding is related to the equipments used in the measurement, the proposed technique is verified on two different VNAs with different architectures including a three-sampler VNA and a four-sampler VNA. Good agreement of de-embedded mixed-mode S-parameters has been achieved on both VNAs.
The Plasticity and Stability of Regulatory T Cells during Viral-Induced Inflammatory Lesions (2017)

Ocular infection with HSV causes a chronic T cell-mediated inflammatory lesion in the cornea. Lesion severity is affected by the balance of different CD4 T cell subsets, with greater severity occurring when the activity of regulatory T cells (Tregs) is compromised. In this study, fate-mapping mice were used to assess the stability of Treg function in ocular lesions. We show that cells that were once Foxp3<sup>+</sup> functional Tregs may lose Foxp3 and become Th1 cells that could contribute to lesion expression. The instability primarily occurred with IL-2R<sup>lo</sup> Tregs and was shown, in part, to be the consequence of exposure to IL-12. Lastly, in vitro-generated induced Tregs (iTregs) were shown to be highly plastic and capable of inducing stromal keratitis when adoptively transferred into Rag1<sup>-/-</sup> mice, with 95% of iTregs converting into ex-Tregs in the cornea. This plasticity of iTregs could be prevented when they were generated in the presence of vitamin C and retinoic acid. Importantly, adoptive transfer of these stabilized iTregs to HSV-1-infected mice prevented the development of stromal keratitis lesions more effectively than did control iTregs. Our results demonstrate that CD25<sup>lo</sup> Treg and iTreg instability occurs during a viral immunoinflammatory lesion and that its control may help to avoid lesion chronicity.
Initial Clinical Experience with a Novel Dedicated Cobalt–Chromium Stent for the Treatment of Below-the-knee Arterial Disease (2008)

The incidence and prevalence of critical limb ischaemia (CLI) is progressively increasing, mainly because of the widespread incidence of diabetes mellitus and longer life expectancy in developed countries.1 Beyond lifestyle changes and medical therapy, arterial revascularisation is a mainstay in the management of patients with CLI due to below-the-knee (BTK) disease in order to improve functional class and prevent complications possibly leading to amputation and limb loss.2 Until recently vascular surgery by means of distal bypasses was considered
Effects of Arginine Concentration on the In Vitro Expression of Casein and mTOR Pathway Related Genes in Mammary Epithelial Cells from Dairy Cattle (2014)

Arginine (Arg) is a conditionally-essential amino acid that is taken up by bovine mammary gland in excess of its output in milk. In this study we evaluated the effects of Arg concentration on the expression of casein and signaling pathway-related genes in mammary epithelial cells. The treatments (applied for 24 h) were designed to be devoid of Arg 0X (control; 0.00 mg/L), resemble the profile of Arg in casein (Arg 1X; 278.00 mg/L), be deficient [Arg 0.25X (69.50 mg/L) and Arg 0.5X (139.00 mg/L)], or be in excess of the amount in casein [Arg 2X (556.00 mg/L), Arg 4X (1,112 mg/L), and Arg 8X (2,224 mg/L)]. The expression of CSN1S, CSN3 and mTOR in the experimental groups was higher than those of the control group (P<0.05). Except for Arg 0.25X and Arg 8X (P>0.05), the expression of CSN1S2, CSN2 and JAK2 in other experimental groups was higher (P<0.05) than those in the control group. Except for Arg 8X (P>0.05), the expression of STAT5 in the other experimental groups was higher than those of the control (P<0.05). It also was observed that except for Arg 0.5X, the S6K expression was higher in other experimental groups than the control (P<0.05). In contrast, except for Arg 0.25X the other experimental groups resulted in lower 4EBP1 expression than the control (P<0.05). Among groups, the expression of CSN1S1, CSN1S2, CSN2, CSN3, JAK2, STAT5, mTOR and S6K gene was highest with Arg 2X (P<0.05); the reverse was true for 4EBP1 gene, with the lowest expression in this group (P<0.05). Taken together, Arg appears to play an important role in the transcriptional regulation of casein genes and mTOR-related genes in bovine mammary epithelial cells.
Cascade-coupled racetrack resonators based on the Vernier effect in the mid-infrared (2014)

In this paper we report the experimental demonstration of racetrack resonators in silicon-on-insulator technology platform operating in the mid-infrared wavelength range of 3.7-3.8 μm. Insertion loss lower than 1 dB and extinction ratio up to 30 dB were measured for single resonators. The experimental characterization of directional couplers and bending losses in silicon rib waveguides are also reported. Furthermore, we present the design and fabrication of cascade-coupled racetrack resonators based on the Vernier effect. Experimental spectra of Vernier architectures were demonstrated for the first time in the mid-infrared with insertion loss lower than 1 dB and maximum interstitial peak suppression of 10 dB.
Open experiments of mobile sightseeing support systems with shared virtual worlds (2006)

In this paper, we describe results from the experiments of a location-dependent shared virtual world system applied to sightseeing entertainment. This system can be used with GPS-phones on the current Japanese market. Users can enjoy interacting with virtual objects including virtual animals/agents. Subjects of the experiments were real tourists who had their own GPS-phones compatible with our system. We found that evaluations on the system varied depending on age, gender, and experiences of subjects. Results from the experiments gave suggestions on prospective users and service design.
Energy Distribution in a Glass: Nd3+ Laser Rod (1965)

The radial dependence of the absorbed energy distribution in a cylindrical rod of Nd3+-glass pumped with a xenon source has been determined. Using the exact Nd3+-glass absorption spectrum, both the total absorbed energy and the absorbed inversion energy are calculated to determine the magnitude of the energy dissipated by the host glass. In general, absorbed inversion energy and the dissipated energy are not uniform across the radius of the rod, although a value of 5×1020 ions/cm2 for the Nd3+ concentration, multiplied by the rod radius, gives a fairly uniform distribution.
Sparse Tiling for Stationary Iterative Methods (2004)

In modern computers, a program’s data locality can affect performance significantly. This paper details full sparse tiling, a run-time reordering transformation that improves the data locality for stationary iterative methods such as Gauss–Seidel operating on sparse matrices. In scientific applications such as finite element analysis, these iterative methods dominate the execution time. Full sparse tiling chooses a permutation of the rows and columns of the sparse matrix, and then an order of execution that achieves better data locality. We prove that full sparsetiled Gauss–Seidel generates a solution that is bitwise identical to traditional Gauss–Seidel on the permuted matrix. We also present measurements of the performance improvements and the overheads of full sparse tiling and of cache blocking for irregular grids, a related technique developed by Douglas et al.
Two chromosomal loci involved in production of exopolysaccharide in Agrobacterium tumefaciens (1989)

The chromosomal locus pscA (exoC) of Agrobacterium tumefaciens LBA4301 has been cloned by complementation of the avirulent and exopolysaccharide (EPS)-deficient mutant LBA4301 pscA. We have also identified a new locus, termed psdA (polysaccharide depression) and located 16 kilobases from pscA in the A. tumefaciens chromosome, that negatively affects EPS production when it is present in more than one copy in A. tumefaciens LBA4301. Subcloning, transposon mutagenesis, and transcriptional analysis have been conducted for both loci and indicate that pscA and psdA are transcribed in the same orientation. Acidic-EPS assays showed that psdA depresses succinoglycan production and that its negative effect increases with the copy number of the gene. Virulence tests of psdA transconjugants on Datura stramonium showed no visible alteration in virulence, while LBA4301 pscA was totally avirulent.
Rice University Class of 1987 newsclippings (1987)

Photograph image of a crowd of undergraduates wait to receive their diploma at the 74th Rice University graduation ceremony.
A fiber-optic passive double star network for microcellular radio systems applications (2002)

Fiber-optic passive double star (PDS) network is described as a flexible and cost effective access network for microcellular radio systems. A unit cell structure is introduced which enables the PDS network to be effectively incorporated into the access portion of microcellular radio systems. The reduced total fiber length in the unit cell structure based on the PDS network is discussed in comparison with the conventional architecture. A system configuration which forms a cascade TDMA access over the PDS network and the wireless link is described, with this configuration, resource sharing and handover between microcells in a unit cell are centrally controlled by using the dynamic channel allocation. Substantial performance improvement for loaded traffic of the base station can be attained by resource sharing.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
IL-17 and antigen-specific IL-17 responses in distinct subsets of patients with pulmonary sarcoidosis (2012)

Sarcoidosis is an inflammatory disorder characterized by granulomas most commonly affecting the lungs. Sarcoidosis patients with Löfgren's syndrome (erythema nodosum and/or ankle arthritis, fever and bilateral hilar lymphadenopathy with or without lung parenchymal infiltration) have a good prognosis, particularly if they are HLA-DR3+. The presence of mycobacterial antigens, and recently a specific protein, M. tuberculosis catalase-peroxidase (mKatG), in sarcoidosis tissue has been reported. Th1 cell responses against mKatG have previously been observed in sarcoidosis. In the present study our aim was to investigate the presence of interleukin (IL)-17 (synonymous to IL-17A) and IL-17-producing cells responding to mKatG in sarcoidosis.
Validation of diagnostic tests for determination of magnesium status in horses with reduced magnesium intake (2004)

The 24-hour EMg was the most sensitive indicator of reduced Mg intake in horses. Spot sample FCMg can be conveniently used to identify horses consuming a diet deficient in Mg.
Transforming camera geometry to a virtual downward-looking camera: robust ego-motion estimation and ground-layer detection (2003)

This paper presents a robust method to solve two coupled problems, ground-layer detection and vehicle ego-motion estimation, which appear in visual navigation. We virtually rotate the camera to the downward-looking pose in order to exploit the fact that the vehicle motion is roughly constrained to be planar motion on the ground. This camera geometry transformation together with the planar motion constraint will: 1) eliminate the ambiguity between rotational and translation ego-motion parameters, and 2) improve the Hessian matrix condition in the direct motion estimation process. The virtual downward-looking camera enables us to estimate the planar ego-motions even for small image patches. Such local measurements are then combined together, by a robust weighting scheme based on both ground plane geometry and motion compensated intensity residuals, for a global ego-motion estimation and ground plane detection. We demonstrate the effectiveness of our method by experiments on both synthetic and real data.