gebhart/patrepeval huggingface dataset:
Synthesis of polymers with amino end groups. 3. Reactions of anionic living polymers with α-halo-ι-aminoalkanes with a protected amino functionality (1990)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of polymers with amino end groups. 3. Reactions of anionic living polymers with α-halo-ι-aminoalkanes with a protected amino functionalityKenji Ueda, Akira Hirao, and Seiichi NakahamaCite this: Macromolecules 1990, 23, 4, 939–945Publication Date (Print):February 1, 1990Publication History Published online1 May 2002Published inissue 1 February 1990https://pubs.acs.org/doi/10.1021/ma00206a006https://doi.org/10.1021/ma00206a006research-articleACS PublicationsRequest reuse permissionsArticle Views1012Altmetric-Citations100LEARN 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
Familial Alzheimer's Disease With Myoclonus and 'Spongy Change' (1988)

"Spongy change," or vacuolar change, was observed in the neocortex of temporal and frontal lobes in four of 27 patients with clinical and pathologic characteristics of Alzheimer's disease. All four cases had the autosomal dominant form of the disease, and aside from severe dementia, all developed myoclonus and became mute before death. The degeneration observed was unlike that seen in Creutzfeldt-Jakob disease because it lacked astrocytosis and had a different distribution of lesions. Moreover, the abundance of neurofibrillary changes and senile plaques was consistent with Alzheimer's disease. None of the other 23 cases were familial, and none developed myoclonus or mutism; three of them had minor vacuolation limited to the temporal lobe. The four cases with severe spongy change described are the first, to our knowledge, in which vacuolar or spongy change has been associated with the familial form of Alzheimer's disease.
Occupational Radon Assessment in Underground Storage Facilities in Saudi Arabia (2021)

An occupational radon assessment was conducted at five underground storage facilities in the Kingdom of Saudi Arabia to evaluate the radon concentration and determine if remedial action is required to ameliorate conditions and ensure compliance with international guidance on acceptable radon levels in working environments. The assessment was carried out in four operational areas in the underground storage facilities routinely occupied or visited by workers. Initial radon concentrations were obtained using 293 passive CR-39 Nuclear Track Detector (NTD) radon dosimeters installed in the four operational areas for all the underground storage facilities. The detectors were left in place for 12 mo. As some of the radon measurements exceeded the International Atomic Energy Agency reference level of 1,000 Bq m-3 for radon in workplaces, a follow-up assessment was conducted using a real-time monitoring device in locations where high radon levels were observed. The measured radon concentrations in the four operational areas in three of the five underground storage facilities were below the reference level, and in the remaining two storage facilities, low ventilation rates in one operational area were identified as the principal cause of elevated radon concentrations. Notwithstanding, the potential radiation dose from radon exposure was determined to be well below the International Commission on Radiation Protection reference annual dose level of 10 mSv in all five underground storage facilities. Radon exposure to workers in all the underground storage facilities was found to be within the reference dose level for workplaces and does not pose an acute health risk.
Irreversible chemical steps control intersubunit dynamics during translation (2008)

The ribosome, a two-subunit macromolecular machine, deciphers the genetic code and catalyzes peptide bond formation. Dynamic rotational movement between ribosomal subunits is likely required for efficient and accurate protein synthesis, but direct observation of intersubunit dynamics has been obscured by the repetitive, multistep nature of translation. Here, we report a collection of single-molecule fluorescence resonance energy transfer assays that reveal a ribosomal intersubunit conformational cycle in real time during initiation and the first round of elongation. After subunit joining and delivery of correct aminoacyl-tRNA to the ribosome, peptide bond formation results in a rapid conformational change, consistent with the counterclockwise rotation of the 30S subunit with respect to the 50S subunit implied by prior structural and biochemical studies. Subsequent binding of elongation factor G and GTP hydrolysis results in a clockwise rotation of the 30S subunit relative to the 50S subunit, preparing the ribosome for the next round of tRNA selection and peptide bond formation. The ribosome thus harnesses the free energy of irreversible peptidyl transfer and GTP hydrolysis to surmount activation barriers to large-scale conformational changes during translation. Intersubunit rotation is likely a requirement for the concerted movement of tRNA and mRNA substrates during translocation.
Stacked, Mutually Rotated Diffraction Gratings as Enablers of Portable Visible Spectrometry (2016)

Two-dimensional color CMOS cameras have become ubiquitous. They promise to support ubiquitous spectrometry. When raw illumination levels can be measured by such cameras, their use for spectrometry depends on using as many pixels as possible and on being able to calibrate images at point-of-use. Stacked, mutually rotated transmission diffraction gratings provide a means to generate multi-order, wide dynamic range dispersed visible spectra suitable for absorption, reflection, and fluorescence spectrometry. The theoretical basis for dispersion, resolution, and normalization of such spectra are derived, and initial characterization is reported.
Recent advantages in lightfield microscopy (Conference Presentation) (2020)

In the past few years the integral-imaging, or lightfield, concept has been applied successfully to microscopy. More specifically, in the case of fluorescent samples integral, or lightfield, microscopy offers the advantage of capturing the 3D information in a single shot. Due to its potential utility integral microscopy is now facing many challenges, like improving the resolution and depth of field, the development and optimization of specially-adapted reconstruction algorithms, or the search of applications in which lightfield microscopy is superior to existing techniques. This contribution is devoted to review the recent advances of integral microscopy and enunciate the right questions about the progress of the technique.
Phycobiliprotein-bilin linkage diversity. I. Structural studies on A- and D-ring-linked phycocyanobilins. (1986)

Phycocyanobilin (PCB) peptides alpha-1 PCB and beta-2T PCB were obtained by proteolytic degradation of Synechococcus 6301 C-phycocyanin. These peptides were found to have the following sequences. alpha-1 PCB Cys(PCB)-Ala-Arg beta-2T PCB Ile-Thr-Gln-Gly-Asp-Cys(PCB)-Ser-Ala. The peptides were examined by 1H NMR, circular dichroism spectroscopy, and secondary ion mass spectrometry. The 1H NMR data confirmed that in each case the bilin was attached through a single linkage, a thioether bond between the cysteinyl residue and the tetrapyrrole moiety. Comparison of the 1H NMR spectra of these peptides with those of appropriate model compounds showed that the thioether linkage in alpha-1 PCB was to the C-3' position and that in beta-2T PCB to the C-18' position on the bilin. Refluxing in neutral methanol under nitrogen led to the release of PCB from alpha-1 PCB but did not release the D-ring-linked tetrapyrrole from beta-2T. The above results together with those of an earlier study (Lagarias, J. C., Glazer, A. N., and Rapoport, H. (1979) J. Am. Chem. Soc. 101, 5030-5037) complete the determination of the mode of linkage of each of the three bilins on C-phycocyanin; two are linked through ring A and one through ring D. This is the first documented report of a singly D-ring-linked bilin.
Detection of allele specific differences in IFNL3 (IL28B)mRNA expression (2014)

This indicates that allele specific differences in IFNL3 expression vary between individuals and might contribute to the variety of outcomes in HCV infected patients.
External skeletal fixation: choosing a system based on biomechanical stability. (1988)

Due to the increased popularity of external fixators for treating long-bone fractures, many devices are being introduced to the market. The choice of a particular fixation device depends on the anticipated loading conditions or the demands the fixator might encounter during the healing process. This study compares the biomechanical stability (rigidity, yield-load, failure-load) and load to produce 1 mm of fracture-gap displacement of various half-frames of five systems tested in axial compression, torsion, and both anterior-posterior and medial-lateral bending; the slippage tolerances of various interfaces of the universal joints or clamps were also analyzed. The frames were mounted on acrylic rods, with a midshaft transverse saw-cut, displaced by 10 mm, and set to standardized dimensions and tightened at set torques. In terms of stability, the Brooker and Hoffman systems are, in general, less stable than the RxFx, AO, and Orthofix fixators. The single half-frames of all systems, except the Orthofix, were particularly weak, and the double and stacked half-frames of each system were more stable.
Circularly Polarized Stacked Annular-Ring Microstrip Antenna With Integrated Feeding Network for UHF RFID Readers (2010)

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> A novel circularly polarized (CP) annular-ring microstrip antenna (ARMSA) is proposed for American ultrahigh frequency (UHF) radio frequency identification (RFID) readers. The annular ring is fed by an equal-split power divider with 90$^{\circ}$ phase difference. For the compactness of the entire antenna, the divider with the shape of Archimedes gradual-change lines is designed at the inside of the annular ring. A circular parasitic patch is suspended above the ring to improve the impedance matching and bandwidth. It also enhances the performances of axial ratio (AR). The impedance bandwidth for ${\rm S} _{11} &lt; -10~$dB and 3-dB AR bandwidth are 870967 MHz (10.6% at 915 MHz) and 893948 MHz (6%), respectively. The CP gain is 8.9 dBi at 915 MHz with the front-to-back ratio (F/B) of 16.5 dB. The proposed antenna is low profile as the total height is $0.043 \lambda _{0}$ ($\lambda_{0}$ is the free-space wavelength ). </para>
Exemplar Storage Permit Applications to Evaluate and Test Site Characterisation Methodologies. (2014)

The production of dry-run storage permit applications at two credible, if conceptual, CO 2 storage sites allowed development of effective approaches to site characterization and identified the necessary levels of evidence required to assess the safety, containment and storage capacity of putative sites. This paper describes an exemplar permitting process and conclusions drawn from this experience for developing successful storage permits.
An antineuronal autoantibody in paraneoplastic opsoclonus (1988)

Sera from 7 patients with paraneoplastic opsoclonus were examined for antineuronal autoantibodies. An antibody against neuronal nuclei was found in serum from a patient with breast cancer, opsoclonus, and ataxia. This antibody recognized 53- to 61-kDa and 79- to 84-kDa antigens in immunoblots of neurons. Antineuronal antibodies were not found in other patients with paraneoplastic opsoclonus.
Photoinitiated polymerization of acrylate, methacrylate, and vinyl ether end‐functional polyisobutylene macromonomers (2012)

Abstract Polyisobutylene‐based UV cured networks potentially useful as sealants were synthesized by photopolymerization of well‐defined polyisobutylene methacrylate (PIB‐MA), acrylate (PIB‐A) and vinyl ether (PIB‐VE) di‐ and trifunctional macromonomers. The kinetics of photocrosslinking were measured using an optical pyrometer apparatus and optimized with respect to different experimental parameters. PIB‐MA/A macromonomers displayed enhanced reactivity in radical photopolymerization in the presence of a bis (acylphosphine) oxide photoinitator. PIB‐VE macromonomers exhibited a high rates of photopolymerization with (4‐ n ‐octyloxyphenyl)phenyliodonium hexafluroantimonate as the photoinitiator. The rates as well as the ultimate monomer conversions were increased by increasing the irradiation light intensity. The inherent induction period associated with oxygen inhibition in the photopolymerization of PIB‐MA was significantly reduced by optimizing the choice of photoinitiator. A detailed investigation of the concentration of MA/A/VE end groups revealed the presence of a prominent saturation effect in the photopolymerization of PIB‐A, which was absent with PIB‐MA and PIB‐VE. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013
Enantioselective Aluminum‐Free Alkene Hydroarylations through C−H Activation by a Chiral Nickel/JoSPOphos Manifold (2018)

Highly enantioselective nickel-catalyzed alkene endo-hydroarylations were accomplished with full selectivity by organometallic C-H activation. The asymmetric assembly of chiral six-membered scaffolds proved viable in the absence of pyrophoric organoaluminum reagents within an unprecedented nickel/JoSPOphos manifold.
Storage of ADSOL-Preserved Red Cells at 2.5 and 5.5°C: Comparable Retention of in vitro Properties(1) (1990)

Previous studies with CPDA-1 and Nutricel preserving solutions indicated that red cell properties were affected by small differences in storage temperature. The influence of a 3°C differential on the preservation of the in vitro properties of ADSOL-preserved (AS-1) red blood cells was investigated in a paired study. AS-f red blood cells were stored at 2.5 and 5.5 °C for 42 days. Extent of hemolysis, glucose consumption and pH levels were comparable at the two storage temperatures. Lactate levels were slightly, but significantly higher at 5.5°C. ATP levels were slightly but significantly higher at 2.5°C, only during the later part of the storage period. 2.3-DPG levels were slightly better retained at 2.5 °C after 7 days of storage. Holding units of whole blood for either 1 or 8h at ambient temperature after phlebotomy prior to processing did not influence the types of temperature-dependent changes. The differences as a function of storage temperature were small and appear to be of no practical importance in connection with the storage of AS-1 red blood cells.
Sub 50-nm FinFET: PMOS (2003)

High performance PMOSFETs with gate length as short as 18-nm are reported. A self-aligned double-gate MOSFET structure (FinFET) is used to suppress the short channel effect. A 45 nm gate-length PMOS FinEET has an I/sub dsat/ of 410 /spl mu/A//spl mu/m (or 820 /spl mu/A//spl mu/m depending on the definition of the width of a double-gate device) at Vd=Vg=1.2 V and Tox=2.5 nm. The quasi-planar nature of this variant of the double-gate MOSFETs makes device fabrication relatively easy using the conventional planar MOSFET process technologies. Simulation shows possible scaling to 10-nm gate length.
Resonant pumping and upconversion in 16 μm Er^3+ lasers (2007)

A four-level, plane wave model is proposed for a resonantly pumped 1.6 μm Er3+ laser, including the effect of upconversion. A mean population approximation leads to analytical expressions for the threshold and slope efficiency that are highly accurate compared to the numerical solution. Using the beam area as an adjustable parameter, the threshold and slope efficiency agree well with data obtained using a 1% Er:YAG crystal, pumped at 1470 nm, lasing at 1617 nm, in the range 0-100°C. According to the model for this laser, the slope efficiency versus absorbed pump power is unaffected by upconversion, but the threshold is increased by a factor of 2-3. The results are important for choosing the optimum doping level and fiber or rod length.
New Therapy for Polymorphous Light Eruption (1973)

A patient suffering from polymorphous light eruption did not respond to conventional modes of therapy. Phototesting demonstrated that he was sensitive to light from 290 to 500 nm. The patient was treated with a combination of sulisobenzone and β-carotene, with amelioration of the disease.
THE THERMAL DECOMPOSITION OF ORGANIC COMPOUNDS FROM THE STANDPOINT OF FREE RADICALS. I. SATURATED HYDROCARBONS (1931)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE THERMAL DECOMPOSITION OF ORGANIC COMPOUNDS FROM THE STANDPOINT OF FREE RADICALS. I. SATURATED HYDROCARBONSF. O. RiceCite this: J. Am. Chem. Soc. 1931, 53, 5, 1959–1972Publication Date (Print):May 1, 1931Publication History Published online1 May 2002Published inissue 1 May 1931https://pubs.acs.org/doi/10.1021/ja01356a053https://doi.org/10.1021/ja01356a053research-articleACS PublicationsRequest reuse permissionsArticle Views997Altmetric-Citations124LEARN 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
Parity-selective enhancement of field-free molecular orientation in an intense two-color laser field (2011)

We investigated the characteristics of molecular orientation induced by a nonresonant two-color femtosecond laser field. By analyzing the rotational dynamics of asymmetric linear molecules, we revealed that the critical parameter in characterizing the molecular orientation was the hyperpolarizability of molecules that selected the excitation paths of rotational states between parity-changing and parity-conserving transitions. Especially, in the case of molecules with small hyperpolarizability, a significant enhancement of orientation was achieved at the half-rotational period, instead of the full-rotational period. This deeper understanding of the hyperpolarizability-dependent characteristics of molecular orientation in a two-color scheme can provide an effective method to achieve significantly enhanced field-free orientation for various polar molecules.
GaN film growth on LiNbO3surfaces using molecular beam epitaxy (2009)

GaN has been used for high power, high frequency electronic and optoelectronic devices such as light emitting diodes and laser diodes. Most of the GaN films grow on sapphire (0001) and silicon (111) substrates. In these work, we are trying to grow GaN films on lithium niobate (LiNbO3) substrates using molecular beam epitaxy (MBE). As a ferroelectric materials, LiNbO3 has a spontaneous polarization which may provide excellent control of polarity of GaN. The growth of GaN films on LiNbO3 has been performed after the LiNbO3 substrates was annealed in air at 1000°C for 2 hours. The annealed substrates allowed us to prepare atomically flat surfaces and improve adhesion of GaN on LiNbO3. The AlN buffer layer was deposited to get a smaller lattice mismatch with the GaN films. Compared with GaN films grown without a AlN layer, the crystal qualities of GaN films with AlN buffer layers are extremely improved. The surface morphology of LiNbO3 substrates and the grown GaN films were characterized by atomic force microscopy (AFM), and the crystal structures were studied by X-ray diffraction (XRD).
ORGANO SILYLETHYLENEDIAMINE COMPOUNDS. II. THE NUCLEAR MAGNETIC RESONANCE SPECTRA OF SILYLAMINES (1963)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTORGANO SILYLETHYLENEDIAMINE COMPOUNDS. II. THE NUCLEAR MAGNETIC RESONANCE SPECTRA OF SILYLAMINESD. Kummer and J. D. BaldeschwielerCite this: J. Phys. Chem. 1963, 67, 1, 98–103Publication Date (Print):January 1, 1963Publication History Published online1 May 2002Published inissue 1 January 1963https://pubs.acs.org/doi/10.1021/j100795a022https://doi.org/10.1021/j100795a022research-articleACS PublicationsRequest reuse permissionsArticle Views73Altmetric-Citations11LEARN 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 options Get e-Alerts
A simple drain current model for Schottky-barrier carbon nanotube field effect transistors (2006)

We report on a new computational model to efficiently simulate carbon nanotubebased field effect transistors (CNT-FET). In the model, a central region is formed by a semiconducting nanotube that acts as the conducting channel, surrounded by a thin oxide layer and a metal gate electrode. At both ends of the semiconducting channel, two semi-infinite metallic reservoirs act as source and drain contacts. The current-voltage characteristics are computed using the Landauer formalism, including the effect of the Schottky barrier physics. The main operational regimes of the CNT-FET are described, including thermionic and tunnel current components, capturing ambipolar conduction, multichannel ballistic transport and electrostatics dominated by the nanotube capacitance. The calculations are successfully compared to results given by more sophisticated methods based on non-equilibrium Green's function formalism (NEGF).