68 results on '"NAK"'
Search Results
2. Current thoughts on cellular functions of numb-associated kinases.
- Author
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Huang, Chenxi, Ji, Cuicui, and Wang, Juan
- Abstract
Members of the Numb-associated kinase family of serine/threonine kinases play an essential role in many cellular processes, such as endocytosis, autophagy, dendrite morphogenesis, osteoblast differentiation, and the regulation of the Notch pathway. Numb-associated kinases have been relevant to diverse diseases, including neuropathic pain, Parkinson's disease, and prostate cancer. Therefore, they are considered potential therapeutic targets. In addition, it is reported that Numb-associated kinases have been involved in the life cycle of multiple viruses such as hepatitis C virus (HCV), Ebola virus (EBOV), and dengue virus (DENV). Recently, Coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) continues to threaten global health. Studies show that Numb-associated kinases are implicated in the infection of SARS-CoV-2 which can be suppressed by Numb-associated kinases inhibitors. Thus, Numb-associated kinases are proposed as potential host targets for broad-spectrum antiviral strategies. We will focus on the recent advances in Numb-associated kinases-related cellular functions and their potential as host targets for viral infections in this review. Questions that remained unknown on the cellular functions of Numb-associated kinases will also be discussed. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
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3. Born–Oppenheimer potential energy curves of NaK from the optimised atomic basis sets.
- Author
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Bączek, K., Jasik, P., Kilich, T., and Sienkiewicz, J. E.
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POTENTIAL energy , *ELECTRON configuration , *CONDUCTION electrons , *DIATOMIC molecules , *ATOMIC nucleus , *PSEUDOPOTENTIAL method - Abstract
The article presents adiabatic potential energy curves of the ground and excited electronic states for the diatomic NaK molecule. The calculations were made using the ab initio computational methods to include electron correlation. The studied molecule was calculated as the effective two-electron problem, in which only the valence electrons of the molecule are explicitly taken into account. The remaining electrons with atomic nuclei are described with appropriate, energy-consistent relativistic pseudopotentials. Additionally, a bespoke basis set, generated and optimised for both ground and excited electronic states of the NaK system was developed. The spectroscopic parameters of the calculated potential energy curves were determined and compared with the available experimental and theoretical results. The compliance of the obtained results, despite slight differences, is very satisfactory. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
4. Clinico Epidemiological Profile of Dialysis Services in Karnataka, India -- A Multicentric Exploratory Study.
- Author
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Conjeevaram, Arvind, Anupama, Y. J., Vincent, Lloyd, Sastry, Nandakumar B., Siddini, Vishwanath, Revanasiddappa, Manjunath, Srinivasa, Sanjay, Thimmegeowda, Anilkumar B., Kulkarni, Manjunath J., and Patil, Vivek S.
- Subjects
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TREATMENT of chronic kidney failure , *DIABETES complications , *RESEARCH , *MEDICAL care , *PERITONEAL dialysis , *HEMODIALYSIS facilities , *DESCRIPTIVE statistics , *HEMODIALYSIS , *SOCIODEMOGRAPHIC factors , *DATA analysis software - Abstract
Introduction: New challenges in dialysis care delivery confront caregivers with the rise in dialysis numbers. There are significant lacunae in the knowledge and efficient application of dialysis therapy in the absence of a dialysis registry. This multicentric study was conducted by the Nephrology Association of Karnataka to systematically study patient demographics and dialysis characteristics in Karnataka state, India, as a basis for a statewide dialysis registry. Material and Methods: Data were collected from the consenting dialysis centers after institutional ethics board clearances. Residents of Karnataka state, who were confirmed prevalent patients with end-stage renal disease, on either maintenance hemodialysis (HD) or peritoneal dialysis were included. Demographic data of patients and details of dialysis as well as dialysis facilities were collected on an online platform. Statistical analysis was done using SPSS software Version 16. Results: Thirty-two centers contributed to the data of 2,050 patients (males 70.3%, mean age 53.49 ± 14.09 years). Most patients were on HD (95.3%). Diabetes was the commonest cause of chronic kidney disease. About 72% of patients had temporary venous catheters as initial vascular access. In all, 1,156 patients (59.9%) were on thrice weekly HD. Around 65% of the centers were in private hospitals. The majority (90%) of the centers reused dialyzers, 56% reprocessed dialyzers mechanically, and 66% tested viral serology quarterly. Conclusions: This study was one of the initial attempts to capture dialysis data across Karnataka, and it offers useful insight into the existing dialysis demographics and care delivery. Participation of more centers and continued effort to form a dialysis registry for deriving meaningful clinico-epidemiological insight are desirable. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
5. An all-inclusive approach: A universal protocol for the successful amplification of four genetic loci of all Onscidea
- Author
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Andreas C. Dimitriou and Spyros Sfenthourakis
- Subjects
PCR ,Sanger sequencing ,COI ,16S ,28S ,NaK ,Science - Abstract
Accounting more than 3,700 described species, Oniscidea is the largest and at the same time the only terrestrial isopod suborder inhabiting almost all terrestrial biomes. Despite the great effort dedicated on describing taxonomic diversity of Oniscidea, mainly employing morphology, there is still a considerable number of species/genera of uncertain generic/familiar assignment. Based on different morphological characters, alternative evolutionary relationships have been proposed to describe the diversity of Oniscidea at different phylogenetic levels. Accumulating morphological and genetic data are repeatedly challenging the monophyly of established taxa, undermining the validity of several morphological characters traditionally used in terrestrial isopod taxonomy, leading to often revisions of the current taxonomy of the Oniscidea . The use of genetic data facilitates the efforts to reconstruct the complex evolutionary history of the focal group by providing important data for the identification, delimitation, and description of species. The proposed protocol with universal PCR conditions and primers was used to successfully amplify COI, 16S, 28S and NAK loci in diverse Oniscidea taxa. The application of this protocol is anticipated to facilitate the generation of new genetic data and hence promote scientific research in Isopoda taxonomy, evolution, ecology, and other related fields.
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- 2022
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6. Time-Dependent Extension of Grimme's Continuous Chirality Measure for Electronic Chirality Flips in Femto- and Attosecond Time Domains.
- Author
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Guo Y, Haase D, Manz J, Wang H, and Yang Y
- Abstract
Grimme's Continuous Chirality Measure ( C C M ${CCM}$ ) was developed for comparisons of the chirality of the electronic wave functions of molecules, typically in their ground states. For example, C C M = 14 . 5 ${CCM=14.5}$ , 1 . 2 ${1.2}$ and 0 . 0 ${0.0}$ for alanine, hydrogen-peroxide, and for achiral molecules, respectively. Well-designed laser pulses can excite achiral molecules from the electronic ground state to time-dependent chiral superposition states, with chirality flips in the femto- or even attosecond (fs or as) time domains. Here we provide a time-dependent extension C C M t ${CCM\left(t\right)}$ of Grimme's C C M ${CCM}$ for trailing the electronic chirality flips. As examples, we consider two laser driven electronic wavefunctions which represent flips between opposite electronic enantiomers of oriented NaK within 4 . 76 f s ${4.76\ {\rm f}{\rm s}}$ and 433 a s ${433\ {\rm a}{\rm s}}$ . The corresponding C C M t ${CCM\left(t\right)}$ vary respectively from 14 . 5 ${14.5}$ or from 13 . 3 ${13.3}$ to 0 . 0 ${0.0}$ , and back., (© 2024 Wiley-VCH GmbH.)
- Published
- 2024
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7. Evaluation of a Mobile Hot Cell Technology for Processing Idaho National Laboratory Remote-Handled Wastes
- Author
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Care, L
- Published
- 2009
8. Mito-nuclear discordance in West African mangrove crab species (Decapoda: Brachyura: Sesarmidae) suggests uni-directional mitochondrial introgression, despite prolonged evolutionary independence.
- Author
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Shahdadi, Adnan, Mvogo Ndongo, Pierre A., and Schubart, Christoph D.
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MANGROVE crabs , *DECAPODA , *MANGROVE plants , *CRABS , *MITOCHONDRIA , *SPECIES , *INSECTS - Abstract
Mitochondrial introgression is known as one of the major causes of misleading relationships and mito-nuclear discordance in phylogenetic analyses. It appears to be a quite widespread phenomenon in different animal taxa, with most records among vertebrates and insects. So far, in brachyuran crabs such reports of introgression are relatively infrequent. In the present study, we report such a case occurring among Central and West African mangrove crabs, using a multi-locus genetic approach. Our mito-nuclear phylogenetic comparison suggests a mitochondrial introgression between two sesarmid crab species. Based on our preliminary evidence, it seems that the mitochondrial genome of Guinearma alberti has been transferred to representatives of G. huzardi through introgression. These two species have a wide sympatric distribution along the West African coast and are considered to be congeneric based on their relatively close phylogenetic relationship. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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9. Study of Compatibility of Stainless Steel Weld Joints with Liquid Sodium-Potassium Coolants for Fission Surface Power Reactors for Lunar and Space Applications
- Author
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Qualls, Louis [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)]
- Published
- 2015
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10. Anchialine adjustments: an updated phylogeny and classification for the family Barbouriidae Christoffersen, 1987 (Decapoda: Caridea).
- Subjects
DECAPODA ,PHYLOGENY ,GENETIC distance ,GENES ,CLASSIFICATION ,PARSIMONIOUS models - Abstract
Barbouriidae Christoffersen, 1987 is a family comprised of 4 genera and 11 species of enigmatic shrimps restricted to anchialine or marine caves whose evolutionary history and relationships remain elusive. We investigated the evolutionary relationships among members of Barbouriidae with the inclusion of four genera and nine species, and newly collected material from Belize, the Bahamas, and the Yucatán Peninsula, Mexico. Phylogenetic analyses based on seven mitochondrial and nuclear gene regions and genetic distances calculated using partial 16S gene regions have identified a need to revisit the relationships and classification within Barbouriidae. More specifically, we find evidence to suggest Janicea Manning & Hart, 1984 as a junior synonym of Parhippolyte Borradaile, 1900, B. yanezi Mejía, Zarza & López, 2008 as a synonym of Barbouria cubensis (von Martens, 1872), and define two new subfamilies, Calliasmatinae Holthuis, 1973 and Barbouriinae Christoffersen, 1987. Included is a dichotomous key for the species of Barbouriidae that summarizes previous literature and includes new morphological characters. Our findings shed light on existing inaccuracies and gaps in molecular data from barbouriids. We also provide further clarity into evolutionary relationships among genera of Barbouriidae and their allies, suggesting phylogeographic divisions within the family. Our findings suggest an early Atlantic-Pacific divide among genera originating from a shallow-water reef ancestor. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
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11. First record of the genus Fagineura Vikberg & Zinovjev (Hymenoptera, Tenthredinidae) with descriptions of two new species from China.
- Author
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Mengmeng Liu, Zejian Li, and Meicai Wei
- Subjects
- *
HYMENOPTERA , *SPECIES , *SAWFLIES , *RECORDS , *GENES , *TAXONOMY , *MOLECULAR phylogeny - Abstract
Fagineura Vikberg & Zinovjev, 2000 is recorded from China for the first time. Two species of Fagineura are described as new, F. flactoserrula sp. n. and F. xanthosoma sp. n. A key to the species of Fagineura worldwide is provided, now including four species. In addition, a simple phylogenetic analysis of Fagineura species is provided, based on sequences of the COI and NaK genes. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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- View/download PDF
12. Diffusion and reptation quantum Monte Carlo study of the NaK molecule.
- Author
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Segovia, Marc E. and Ventura, Oscar N.
- Subjects
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DIFFUSION , *QUANTUM Monte Carlo method , *DENSITY functional theory , *POTENTIAL energy , *DIPOLE moments - Abstract
Diffusion Monte Carlo (DMC) and Reptation Monte Carlo (RMC) methods, have been applied to study some properties of the NaK molecule. Hartree-Fock (HF), Density Functional (DFT) and single and double configuration interaction (SDCI) wavefunctions with a valence quadruple zeta atomic natural orbital (VQZ/ANO) basis set were used as trial wavefunctions. Values for the potential energy curve, dissociation energy and dipole moment were calculated for all methods and compared with experimental results and previous theoretical derivations. Quantum Monte Carlo (QMC) calculations were shown to be useful methods to recover correlation in NaK, essential to obtain a reasonable description of the molecule. The equilibrium distance yield a value close to the experimental one. The dissociation energy, however, is not so good, and the minimum error is about 4% of the experimental value, except when a coupled-clusters method is used. In this case, a conventional CCSD(T) calculation with an extended aug-pc-4 basis set gives a much better agreement to experiment. However, neither the CCSD(T) nor other MO and DFT methods are able to reproduce correctly the large dipole moment of this molecule. Even DMC methods with a simple HF trial wavefunction are able to give a better agreement to experiment, although they have a larger error bar. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
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13. Monte Carlo Study of the Crystalline and Amorphous NaK Alloy.
- Author
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Reitz, Doug and Blaisten-Barojas, Estela
- Subjects
MONTE Carlo method ,SODIUM alloys ,APPROXIMATION theory ,MELTING points ,AMORPHOUS substances - Abstract
Metropolis Monte Carlo simulations of the eutectic NaK alloy are performed using the Second Moment Approximation (SMA) model potential across a wide range of temperatures at constant pressure. The alloy structure and thermodynamics are analyzed along with the atomic level structures using a variety of structure identification methods. Both enthalpy and density are followed along an annealing process that reveals a clear melting point around 260 K. At lower temperatures, two thermodynamic branches are identified as crystalline and amorphous solids. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
14. Selective adsorption of CO2 on zeolites NaK-ZK-4 with Si/Al of 1.8–2.8
- Author
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Panagiotis Krokidas, Niklas Hedin, Dariusz Wardecki, Ocean Cheung, Nicolas Fil, and Zoltán Bacsik
- Subjects
Solid-state chemistry ,Chemistry ,General Chemical Engineering ,Diffusion ,Inorganic chemistry ,Materialkemi ,Context (language use) ,General Chemistry ,Adsorption ,Selective adsorption ,Materials Chemistry ,Selectivity ,Zeolite ,QD1-999 ,NAK - Abstract
Zeolites with appropriately narrow pore apertures can kinetically enhance the selective adsorption of CO2 over N-2. Here, we showed that the exchangeable cations (e.g., Na' or K) on zeolite ZK-4 play, an important role in the CO2 selectivity. Zeolites NaK ZK-4 with Si/Al = 1.8-2.8 had very high CO2 selectivity when an intermediate number of the exchangeable cations were K+ (the rest being Na+) Zeolites NaK ZK-4 with Si/Al = 1.8 had high CO, uptake capacity and very high CO2-over-N-2 selectivity (1190). Zeolite NaK ZK-4 with Si/A1 = 2.3 and 2.8 also had enhanced CO2 selectivity with an intermediate number of K cations. The high CO, selectivity was related to the I(' cation in the 8 -rings of the alpha-cage, together with Na+ cations in the 6 -ring, obstructing the diffusion of N2 throughout the zeolite. The positions of the K+ cation in the 8 -ring moved slightly (max 0.2 angstrom) toward the center of the a-cage upon the adsorption of CO2, as revealed by in situ X-ray diffraction. The CO2-over-N-2 selectivity was somewhat reduced when the number of K+ cations approached 100%. This was possibly due to the shift in the IC' cation positions in the 8 -ring when the number of Na+ was going toward 0%, glowing N, diffusion through the 8 -ring. According to 'm situ infrared spectroscopy, the amount of chemisorbed CO2 was reduced on zeolite ZK-4s with increasing Si/Al ratio. In the context of potential applications, a kinetically enhanced selection of CO2 could be relevant for applications in carbon capture and bio- and natural gas upgrading.
- Published
- 2020
15. Antibody Characterization Report for Serine/threonine-protein kinase TBK1
- Author
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Alshafie, Walaa, Fotouhi, Maryam, Shlaifer, Irina, Durcan, Thomas M., McPherson, Peter S., and Laflamme, Carl
- Subjects
Serine/threonine-protein kinase TBK1 ,T2K ,NF-kappa-B-activating kinase ,TANK-binding kinase 1 ,antibody characterization ,TBK1 ,Q9UHD2 ,NAK ,antibody validation ,Amyotrophic lateral sclerosis ,ALS-RAP - Abstract
Head to head comparison of available commercial antibodies against Serine/threonine-protein kinase TBK1 by immunoblot (Western blot), immunoprecipitation and immunofluorescence. This work is part of the ALS-Reproducible Antibody Platform (ALS-RAP). ALS-RAPwas created as a public-private partnership by three leading ALS charities - the ALS Association (USA), the Motor Neurone Disease Association (UK), and the ALS Society of Canada.
- Published
- 2021
- Full Text
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16. Solid Medical Waste Management on the Budget Effectiveness at West Pasaman Regional General Hospital West Sumatera
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Farida Aini, Enni Sari Siregar, Helmawati Helmawati, and Nora Zulvianti
- Subjects
Municipal solid waste ,Third party ,Hospital, Solid Medical Waste ,Computer applications to medicine. Medical informatics ,General Engineering ,R858-859.7 ,Toxic waste ,Environmentally Friendly ,Internal management ,Hazardous waste ,Medical waste ,Effective Budget ,Operations management ,Business ,General hospital ,NAK - Abstract
Special handling is needed for the treatment of the management of solid medical waste, especially the hazardous and toxic wastes (B3) at the hospital so that the expected effects of this medical solid waste can be minimized. At the West Pasaman Regional General Hospital, the management of solid medical waste is carried out using a third party. In 2018, The hospital cooperated with PT Noor Annisa Kemikal with the number of the cooperation agreement Number 660/431 / RSUD-2018 and Number 0302 / NAK / PSM / II / 18 on 01-02-2018 and in 2019, with PT Andalas Bumi Lestari with the Agreement Number of Hazardous and Toxic Waste Treatment Services Number 445/003 / PKS / RSUD-2019 and Number 003.22 / ABL-PKS / II / 2019. In the implementation of management by third parties, the Hospital has to provide a quite large amount of budget for services for the management of solid medical waste by a third party. In order to make the existing budget effective and minimize the Budget absorption, the efforts taken are internal management systems so that some solid medical waste (especially Infusion Tubes) does not need to be handled by the third party and by utilizing existing technological equipment instead. Based on existing data, the West Pasaman Regional General Hospital undertakes efforts to process solid medical waste carried out internally by the Hospital itself by using a sterilization system using the existing technology, namely sterilizers. It is expected that the use of Sterilization technology can yield budget effectiveness approximately IDR. 168,890,000. - per year. This is done specifically for infusion tubes with a large density and considered the safest to be sterilized and recycled.
- Published
- 2019
17. Experiments and numerical MHD analysis of LLCB TBM Test-section with NaK at 1 T magnetic field.
- Author
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Satyamurthy, P., Swain, P.K., Tiwari, V., Kirillov, I.R., Obukhov, D.M., and Pertsev, D.A.
- Subjects
- *
MAGNETOHYDRODYNAMICS , *COSMIC magnetic fields , *NUCLEAR physics experiments , *STAINLESS steel , *ELECTRIC potential , *VELOCITY distribution (Statistical mechanics) - Abstract
Experiments were performed with Test-section of LLCB TBM on NaK. Test-section made of stainless steel (SS) included inlet pipe, inlet collector of rectangular cross section, two rows of parallel poloidal (vertical) ducts and outer collector with outlet pipe. Numerical simulation has been carried out using MHD module of FLUENT. Various flow properties like side wall electric potential distribution, pressure and velocity distribution has been compared with measured values. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
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18. Design of a Low Power, Fast-Spectrum, Liquid-Metal Cooled Surface Reactor System.
- Author
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Marcille, T. F., Dixon, D. D., Fischer, G. A., Doherty, S. P., Poston, D. I., and Kapernick, R. J.
- Subjects
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NUCLEAR energy , *POWER resources , *STIRLING engines , *HEAT engines , *IRRADIATION , *RADIATION - Abstract
In the current 2005 US budget environment, competition for fiscal resources make funding for comprehensive space reactor development programs difficult to justify and accommodate. Simultaneously, the need to develop these systems to provide planetary and deep space-enabling power systems is increasing. Given that environment, designs intended to satisfy reasonable near-term surface missions, using affordable technology-ready materials and processes warrant serious consideration. An initial lunar application design incorporating a stainless structure, 880 K pumped NaK coolant system and a stainless/UO2 fuel system can be designed, fabricated and tested for a fraction of the cost of recent high-profile reactor programs (JIMO, SP-100). Along with the cost reductions associated with the use of qualified materials and processes, this design offers a low-risk, high-reliability implementation associated with mission specific low temperature, low burnup, five year operating lifetime requirements. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]
- Published
- 2006
- Full Text
- View/download PDF
19. The Cultural and Filmic Elements that Contribute to the Popularity of the Thai film: Nang Nak.
- Author
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Panyasopon, Natthapon
- Subjects
FOCUS groups ,FILMSTRIPS ,POPULARITY - Abstract
This study examines the cultural meanings and filmic components that contribute to the popularity of the 1999 Thai film Nang Nak. Using semiotics as the primary analytic theory, and in-depth key informant interviews as well as focus group interviews as the means of data collection, the cultural meanings and filmic components of Nang Nak are analyzed to uncover one possible answer for why this film achieved wide popularity in Thailand despite the fact that Thai audiences have, in recent years, devoted a majority of their movie-going hours to mainstream Hollywood films. The results of the research indicate five important features of cultural beliefs and values and five filmic elements that provide one possible explanation for the popularity of Nang Nak. In addition to discussing those cultural beliefs/values and filmic elements, this study argues that Western theories can play a meaningful role in the analysis of Asian films. [ABSTRACT FROM AUTHOR]
- Published
- 2003
20. Ascent properties for pairs of modules.
- Author
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Sather-Wagstaff, Sean
- Abstract
Given a flat local ring homomorphism $${R \rightarrow S}$$ and two finitely generated R-modules M and N, we describe conditions under which the modules $${{\rm Tor}^{R}_{i}(M,N)}$$ and $${{\rm Ext}^{i}_{R}(M,N)}$$ have S-module structures that are compatible with their R-module structures. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
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21. Ultracold Gas of Bosonic (NaK)-Na-23-K-39 Ground-State Molecules
- Author
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Voges, Kai K., Gersema, Philipp, Borgloh, Mara Meyer zum Alten, Schulze, Torben A., Hartmann, Torsten, Zenesini, Alessandro, and Ospelkaus, Silke
- Subjects
Condensed Matter::Quantum Gases ,Ultracold Molecules ,Physics::Atomic and Molecular Clusters ,Physics::Atomic Physics ,Physics::Chemical Physics ,NaK ,Stirap - Abstract
We report the creation of ultracold bosonic dipolar (NaK)-Na-23-K-39 molecules in their absolute rovibrational ground state. Starting from weakly bound molecules immersed in an ultracold atomic mixture, we coherently transfer the dimers to the rovibrational ground state using an adiabatic Raman passage. We analyze the two-body decay in a pure molecular sample and in molecule-atom mixtures and find an unexpectedly low two-body decay coefficient for collisions between molecules and K-39 atoms in a selected hyperfine state. The preparation of bosonic (NaK)-Na-23-K-39 molecules opens the way for future comparisons between fermionic and bosonic ultracold ground-state molecules of the same chemical species.
- Published
- 2020
- Full Text
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22. Chemical compatibility of F82H and 316L in liquid metal heat transfer mediums Li, Na and NaK.
- Author
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Hosaka, Tatsuhiro, Kondo, Masatoshi, Sato, Satoshi, Ando, Masami, and Nozawa, Takashi
- Subjects
- *
LIQUID metals , *HEAT transfer , *NEUTRON sources , *STEEL - Abstract
• Corrosion morphologies of RAFM steel F82H and 316 L austenitic steel in liquid alkali metals Li, Na and NaK were compared. • Significant temperature dependence of corrosion in liquid alkali metals was clarified. • Li diffusion into the steel matrix was analyzed by TOF-SIMS. • Oxides formed on F82H specimens in liquid Na and NaK were identified. Liquid metals Li, Na and NaK are the candidate heat transfer mediums which are installed in the irradiation capsule of advanced fusion neutron source. The compatibility issue of F82H and 316L in the candidate heat transfer mediums was studied by means of the corrosion tests at the temperature up to 823 K. The depletion of Cr, C and Fe from the steel was caused in liquid Li. The Li diffusion into the steel matrix was analyzed by TOF-SIMS. The corrosion in liquid Na was caused by the Na diffusion into the steel matrix and the surface oxidation. The corrosion in NaK was similar with that in liquid Na. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
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23. High Temperature Thermal Energy Storage Utilizing Metallic Phase Change Materials and Metallic Heat Transfer Fluids.
- Author
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Kotzé, Johannes P., von Backstrom, Theodor W., and Erens, Paul J.
- Subjects
- *
HEAT storage , *PHASE change materials , *THERMAL conductivity , *ALUMINUM alloys , *EUTECTIC alloys , *HEAT transfer fluids , *THERMODYNAMICS - Abstract
Cost and volume savings are some of the advantages offered by the use of latent heat thermal energy storage (TES). Metallic phase change materials (PCMs) have high thermal conductivity, which relate to high charging and discharging rates in TES system, and can operate at temperatures exceeding 560°C. In the study, a eutectic aluminium-silicon alloy, AlSi12, is identified as a good potential PCM. AlSi12 has a melting temperature of 577°C, which is above the working temperature of regular heat transfer fluids (HTFs). The eutectic sodium-potassium alloy (NaK) is identified as an ideal HTF in a storage system that uses metallic PCMs. A concept is presented that integrates the TES-unit and steam generator into one unit. As NaK is highly reactive with water, the inherently high thermal conductivity of AlSi12 is utilized in order to create a safe concept. As a proof of concept, a steam power-generating cycle was considered that is especially suited for a TES using AlSi12 as PCM. The plant was designed to deliver 100 MW with 15 h of storage. Thermodynamic and heat transfer analysis showed that the concept is viable. The analysis indicated that the cost of the AlSi12 storage material is 14.7 US$per kWh of thermal energy storage. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF
24. Molecular phylogeny of the bee genus Hoplitis ( Megachilidae: Osmiini) - how does nesting biology affect biogeography?
- Author
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Sedivy, Claudio, Dorn, Silvia, and Müller, Andreas
- Subjects
- *
MOLECULAR phylogeny , *HOPLITIS , *BIOGEOGRAPHY , *ELONGATION factors (Biochemistry) , *BAYESIAN analysis , *RHODOPSIN - Abstract
The genus Hoplitis ( Megachilidae: Osmiini) comprises about 360 described species and occurs on all continents except Australia, South America, and Antarctica. Using five genes, we inferred the phylogeny of Hoplitis including 23 out of the 27 currently recognized subgenera, applying both Bayesian and maximum likelihood methods. Compared to the current morphology-based classification, our phylogeny resulted in three classificatory changes: first, the subgenera Alcidamea, Cyrtosmia, Dasyosmia, Megalosmia, Monumetha, and Prionohoplitis are merged into one large subgenus Alcidamea Cresson, 1864, comb. nov.; second, the subgenera Annosmia, Bytinskia, Coloplitis, and Hoplitis are merged into one large subgenus Hoplitis Klug, 1807, comb. nov.; third, the subgenera Acrosmia, Hoplitina, Penteriades, and Proteriades are merged into one large subgenus Proteriades Titus, 1904, comb. nov. We provide evidence that the genus Hoplitis has a Palaearctic origin and that colonization events to southern Africa and to the Nearctic, as well as recolonization events from the Nearctic to the Palaearctic occurred. The species of the genus Hoplitis exhibit an extraordinary diversity in nesting behaviour, comprising both below and above ground nesting. Parsimony mapping revealed that ground nesting in excavated burrows is the ancestral state amongst Hoplitis bees. We hypothesize that nesting biology strongly affected both range expansion and long-distance dispersal in Hoplitis. © 2012 The Linnean Society of London [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF
25. NaK bound–free and bound–bound 4 3Σ+ → a 3Σ+ emission
- Author
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McGeehan, B.M., Ashman, S., Wolfe, C.M., Steinhardt, R., Monaco, M.L., Huennekens, J., and Hickman, A.P.
- Subjects
- *
SODIUM compounds , *EMISSION spectroscopy , *DIPOLE moments , *EXPERIMENTAL design , *COMPUTER programming , *VIBRATIONAL spectra , *MOLECULAR structure - Abstract
Abstract: The relative transition dipole moment function M(R) for the 4 3Σ+ → a 3Σ+ electronic transition in the sodium–potassium molecule (NaK) has been determined by fitting experimental bound–free and bound–bound emission spectra. The fit is performed using a modified version of the BCONT computer program, which was originally developed by Le Roy. Spectra previously measured in this laboratory from low-lying ro-vibrational levels of the 4 3Σ+ state and new spectra from high-lying levels are included in the fit. A slight adjustment to the inner, repulsive wall of the 4 3Σ+ potential leads to an improved form for that curve. The fitted M(R), when appropriately scaled, agrees very well with recent ab initio calculations of Magnier et al. [Copyright &y& Elsevier]
- Published
- 2011
- Full Text
- View/download PDF
26. Effects of spin–orbit coupling on the coupled and excited states of NaK
- Author
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Wilkins, A.D., Morgus, L., Huennekens, J., and Hickman, A.P.
- Subjects
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COUPLING constants , *SODIUM , *POTASSIUM , *EXCITED state chemistry , *SEPARATION (Technology) , *SPECTRUM analysis - Abstract
Abstract: Spin–orbit coupling constants calculated for several excited states of the NaK molecule are used to interpret recent experiments. The theoretical results, which provide coupling constants as a function of internuclear separation , were convoluted with vibrational wavefunctions in order to determine vibrational-state-dependent spectroscopic constants that could be compared with recent measurements for the state. Sharp structure in the experimental data could be attributed to rapid changes in the adiabatic spin–orbit coupling near an avoided crossing. [Copyright &y& Elsevier]
- Published
- 2009
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27. Nak regulates Dlg basal localization in Drosophila salivary gland cells
- Author
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Peng, Yu-Huei, Yang, Wei-Kan, Lin, Wei-Hsiang, Lai, Tzu-Ting, and Chien, Cheng-Ting
- Subjects
- *
SALIVARY glands , *DROSOPHILA physiology , *PROTEINS , *CELL junctions , *CELL physiology , *ENDOCYTOSIS , *CELL membranes , *SODIUM/POTASSIUM ATPase - Abstract
Abstract: Protein trafficking is highly regulated in polarized cells. During development, how the trafficking of cell junctional proteins is regulated for cell specialization is largely unknown. In the maturation of Drosophila larval salivary glands (SGs), the Dlg protein is essential for septate junction formation. We show that Dlg was enriched in the apical membrane domain of proximal cells and localized basolaterally in distal mature cells. The transition of Dlg distribution was disrupted in nak mutants. Nak associated with the AP-2 subunit α-Ada and the AP-1 subunit AP-1γ. In SG cells disrupting AP-1 and AP-2 activities, Dlg was enriched in the apical membrane. Therefore, Nak regulates the transition of Dlg distribution likely through endocytosis of Dlg from the apical membrane domain and transcytosis of Dlg to the basolateral membrane domain during the maturation of SGs development. [Copyright &y& Elsevier]
- Published
- 2009
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28. Investigation of the D 1Π state of NaK by polarisation labelling spectroscopy
- Author
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Adohi-Krou, A., Jastrzebski, W., Kowalczyk, P., Stolyarov, A.V., and Ross, A.J.
- Subjects
- *
POLARIZATION spectroscopy , *ATOMS , *PARAMETER estimation , *FLUORESCENCE - Abstract
Abstract: Two-colour polarisation labelling experiments measuring the D–X system of NaK have furnished observations of the D 1Π state of NaK up to v″=42. The last observed level is located 7cm−1 below the Na(3p 2P3/2)+K(4s) atomic asymptote, 22247.15cm−1 above the minimum of the electronic ground state, clearly indicating the dissociation products of this state. The vibrational progressions all exhibit irregular intervals, predominantly because of strong interactions with the nearby d 3Π state, which also dissociates to Na(3p)+K(4s) atoms. The polarisation data have been combined with some resolved fluorescence D–X transitions, and analysed by fitting to spectroscopic parameters and to an analytical potential curve. A full deperturbation treatment has not been attempted, but a ‘robust’ weighting scheme has been used to reduce the influence of levels that cannot be properly represented by a single channel model. Parameters determined in a fit to a potential curve include T e =20090.18±0.02cm−1, well depth 2157.0±0.3cm−1, R e =4.1547±0.0002Å, with an unweighted root mean square error of 0.12cm−1 for 959 data. [Copyright &y& Elsevier]
- Published
- 2008
- Full Text
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29. The interplay of wave packet dephasing, optimization efficiency, and target state population in optimally controlled isotope selective photoionization
- Author
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Schäfer-Bung, Boris
- Subjects
- *
SYSTEM analysis , *SCISSION (Chemistry) , *CHEMICAL reactions , *CHEMICAL processes - Abstract
Abstract: The mutual dependencies of characteristic quantities for an isotope selective photoionization, namely optimization efficiency, target state population, and wave packet dephasing are presented for the NaK dimer. A pre-optimized pulse shape obtained from the maximization of the isotopomer ratio 23Na39K/23Na41K for the first excited electronic state serves as an initial guess for the subsequent optimization. For the ionization it provides almost vanishing population of the heavier ionic isotopomer and an ionic isotopomer ratio which is significant higher than the findings obtained from former investigations. The wave packet motions on the first excited state of the neutral molecule are in phase for both isotopomers. The optimization procedure, i.e. the simultaneous maximization of the 23Na39K+ photoionization yield and the minimization of the 23Na41K+ photoionization yield for the electronic ground state is based on optimal control theory and leads to a rise of ionic ground state population for both isotopomers related to a significant wave packet dephasing. Upon optimization the isotopomer ratio of the yields falls due to incidental resonances of vibronic transitions. The interplay of the observables are discussed and compared with the values obtained from an optimization which was started from a pure Gaussian pulse shape. [Copyright &y& Elsevier]
- Published
- 2008
- Full Text
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30. Calculations of transition and permanent dipole moments of heteronuclear alkali dimers NaK, NaRb and NaCs.
- Author
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Aymar, M. and Dulieu, O.
- Subjects
- *
DIPOLE moments , *POLARIZATION (Electricity) , *QUANTUM chemistry , *GAUSSIAN basis sets (Quantum mechanics) , *DIELECTRICS , *PHYSICAL & theoretical chemistry - Abstract
Obtaining ultracold samples of dipolar molecules is a current challenge which requires an accurate knowledge of their electronic properties to guide the ongoing experiments. In this paper, we calculate permanent dipole moments and transition dipole moments for excited states for alkali dimers NaK, NaRb and NaCs using a standard quantum chemistry approach based on pseudopotentials for atomic core representation, Gaussian basis sets, and effective terms for core polarization effects. We provide an extensive set of data concerning transitions among the first seven molecular states of each symmetry 1Σ+, 3Σ+, 1Π, 3Π. The accuracy of our results is generally improved compared to previous similar calculations on NaK, while they are found to be in good agreement with the few NaRb states calculated with other methods. Results for NaCs transition dipole moments are given here for the first time. [ABSTRACT FROM AUTHOR]
- Published
- 2007
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31. Spin–orbit coupling of the NaK 33Π and 31Π states: Determination of the coupling constant and observation of quantum interference effects
- Author
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Eckel, S., Ashman, S., and Huennekens, J.
- Subjects
- *
SPECTRUM analysis , *QUALITATIVE chemical analysis , *MOLECULAR spectroscopy , *FRANCK-Condon principle - Abstract
Abstract: We have studied the mutually perturbing 33Π Ω=0(v =32, J =19)∼31Π Ω=1(v =6, J =19) levels of NaK that are coupled together by the spin–orbit interaction. We note that this coupling is nominally forbidden by the ΔΩ =0 selection rule for spin–orbit perturbations. However 33Π levels labeled by different values of Ω are mixed by rotational coupling; i.e. the 33Π Ω levels are best described by a coupling scheme intermediate between Hund’s cases (a) and (b). Thus the 31Π Ω=1 level couples to the 33Π Ω=0 level via the small admixture of 33Π Ω=1 character in the latter. The 33Π Ω=0(v =32, J =19)∼31Π Ω=1(v =6, J =19) f symmetry pair is of particular interest since it appears to be very close to a 50–50 mixture of triplet and singlet character, and the splitting between these levels provides a direct measure of the 33Π∼31Π spin–orbit coupling constant. On the other hand, excitation spectra of the 33Π Ω=0(v =32, J =19)∼31Π Ω=1(v =6, J =19) e symmetry pair through the mixed “window” levels 1(b)3Π Ω=0(v =17, J =18,20)∼2(A)1Σ+(v =18, J =18,20) display dramatic quantum interference effects associated with “singlet” and “triplet” excitation channels. Almost complete cancellation for populating one or the other of the two upper states is observed for excitation from the predominantly triplet members of the window level pairs. [Copyright &y& Elsevier]
- Published
- 2007
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32. Ultrasonic pretreatment of liquid NaK metal catalyst for side-chain alkenylation of o-xylene with 1,3-butadiene
- Author
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Wang, Leizheng and Zheng, Jiaming
- Subjects
- *
ULTRASONICS , *METAL catalysts , *SONICATION , *SONOCHEMISTRY - Abstract
Abstract: The effects of sonochemical treatment of a NaK eutectic mixture as catalyst on the side-chain alkenylation of o-xylene with 1,3-butadiene were studied. The parameters studied include ultrasound frequency, insonation time, sonication power as well as the reaction temperature. In addition, the effect of N,N,N′,N′-tetramethylethylenediamine (TMEDA) on the reaction was also studied. The results showed that sonochemical treatment of this NaK eutectic mixture catalyst resulted in excellent conversion (up to 83.16%) under mild conditions. The introduction of TMEDA further increased the conversion to 89.4%. [Copyright &y& Elsevier]
- Published
- 2006
- Full Text
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33. A build-up cavity for Fourier transform emission experiments
- Author
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Crozet, P., Vallon, R., Erba, B., Néri, M., and Ross, A.J.
- Subjects
- *
FOURIER transforms , *DIATOMIC molecules , *SPECTRUM analysis instruments , *FLUORESCENCE - Abstract
Abstract: We have recorded electronic spectra of some diatomic species (I2, K2, and NaK), to illustrate the potential power of the combination of two high resolution techniques: intra-cavity laser induced fluorescence (ICLIF) and Fourier transform (FT) spectroscopy. Active and passive optical cavities have been used, working with visible continuous wave (cw) laser sources. The active cavity is a modified commercial ring dye laser, allowing for a sample up to 25cm in length. Dispersed fluorescence spectra recorded on a Bomem Fourier transform spectrometer showed a signal enhancement of about 10 when a molecular source was placed within the resonator. The system was tested with a heatpipe source, producing alkali metal vapour at about 300°C. These experiments illustrate enhanced cascade excitation mechanisms in K2; the highest vibrational levels of the electronic ground state of K2 can be observed with surprising ease. The increase in available power within the cavity has also led to the observation of fluorescence in NaK excited by a two-photon transition (Q (66) 61Σ+ ← X 1Σ+ transition). Spatial limitations have driven us to build a more versatile ring cavity able to accommodate larger sources. This broad-band (590–650nm) build-up cavity is locked by a Hänsch–Couillaud servo-loop to an input laser of (instantaneous) bandwidth ∼1MHz. Power enhancement factors of around 30 have been obtained with a 2.6% input coupler. The performance of the build-up cavity has been tested by recording FT spectra of intra-cavity laser induced fluorescence of iodine. The technique clearly has useful applications for weakly absorbing species, or for those whose electronic states are inaccessible to single-photon absorption techniques. This paper describes the arrangement we have used, highlighting some of the advantages and describing some of the particular difficulties we have encountered. [Copyright &y& Elsevier]
- Published
- 2005
- Full Text
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34. Design study of PbaK-cooled small deep sea fast reactors
- Author
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Otsubo, Akira and Takahashi, Minoru
- Subjects
- *
NUCLEAR reactors , *EUTECTICS , *LEAD , *BISMUTH , *SODIUM , *COOLING - Abstract
Abstract: The liquid lead-bismuth eutectic (Pbood compatibility with water, which is different from sodium. It is expected that the Pbbe used as a coolant of the deep sea fast reactor (DSFR). Physics analysis of the Pb small reactor cores with and without inner control rods performed using the computer program of a neutronics code system (SRAC95) shows that Pbtable for the coolant of small reactors as well as NaK. [Copyright &y& Elsevier]
- Published
- 2005
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- View/download PDF
35. An all-inclusive approach: A universal protocol for the successful amplification of four genetic loci of all Onscidea.
- Author
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Dimitriou AC and Sfenthourakis S
- Abstract
Accounting more than 3,700 described species, Oniscidea is the largest and at the same time the only terrestrial isopod suborder inhabiting almost all terrestrial biomes. Despite the great effort dedicated on describing taxonomic diversity of Oniscidea, mainly employing morphology, there is still a considerable number of species/genera of uncertain generic/familiar assignment. Based on different morphological characters, alternative evolutionary relationships have been proposed to describe the diversity of Oniscidea at different phylogenetic levels. Accumulating morphological and genetic data are repeatedly challenging the monophyly of established taxa, undermining the validity of several morphological characters traditionally used in terrestrial isopod taxonomy, leading to often revisions of the current taxonomy of the Oniscidea . The use of genetic data facilitates the efforts to reconstruct the complex evolutionary history of the focal group by providing important data for the identification, delimitation, and description of species. The proposed protocol with universal PCR conditions and primers was used to successfully amplify COI, 16S, 28S and NAK loci in diverse Oniscidea taxa. The application of this protocol is anticipated to facilitate the generation of new genetic data and hence promote scientific research in Isopoda taxonomy, evolution, ecology, and other related fields., Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (© 2022 The Author(s).)
- Published
- 2022
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36. Identification and optimization of 4-anilinoquinolines as inhibitors of cyclin G associated kinase
- Author
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Christopher R. M. Asquith, Timothy M. Willson, Jonathan M. Elkins, Tuomo Laitinen, P.H.C. Godoi, Carrow I. Wells, Gary L. Johnson, R E Dornsife, Lee M. Graves, Graham J. Tizzard, James M. Bennett, Michael P. East, and William J. Zuercher
- Subjects
0301 basic medicine ,Subfamily ,Regulator ,Protein Serine-Threonine Kinases ,Biochemistry ,Article ,Structure-Activity Relationship ,03 medical and health sciences ,0302 clinical medicine ,Catalytic Domain ,Drug Discovery ,Humans ,Kinome ,General Pharmacology, Toxicology and Pharmaceutics ,Protein Kinase Inhibitors ,Cyclin ,Pharmacology ,Aniline Compounds ,Binding Sites ,Chemistry ,Kinase ,Organic Chemistry ,Intracellular Signaling Peptides and Proteins ,Entry into host ,Endocytosis ,3. Good health ,Molecular Docking Simulation ,Kinetics ,030104 developmental biology ,Drug Design ,030220 oncology & carcinogenesis ,Viruses ,Quinazolines ,Molecular Medicine ,Protein Binding ,NAK - Abstract
4-Anilinoquinolines were identified as potent and narrow-spectrum inhibitors of the cyclin G associated kinase (GAK), an important regulator of viral and bacterial entry into host cells. Optimization of the 4-anilino group and the 6,7-quinoline substituents produced GAK inhibitors with nanomolar activity, over 50 000-fold selectivity relative to other members of the numb-associated kinase (NAK) subfamily, and a compound (6,7-dimethoxy-N-(3,4,5-trimethoxyphenyl)quinolin-4-amine; 49) with a narrow-spectrum kinome profile. These compounds may be useful tools to explore the therapeutic potential of GAK in prevention of a broad range of infectious and systemic diseases.
- Published
- 2017
37. Identification and Optimization of 4-Anilinoquinolines as Inhibitors of Cyclin G Associated Kinase
- Author
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Graham J. Tizzard, Christopher R. M. Asquith, Timothy M. Willson, Jonathan M. Elkins, Tuomo Laitinen, James M. Bennett, P.H.C. Godoi, and William J. Zuercher
- Subjects
0303 health sciences ,Kinase ,Regulator ,Biology ,Entry into host ,Narrow spectrum ,3. Good health ,03 medical and health sciences ,0302 clinical medicine ,Biochemistry ,030220 oncology & carcinogenesis ,Cyclin-dependent kinase complex ,Cyclin-dependent kinase 9 ,030304 developmental biology ,NAK ,Cyclin - Abstract
4-Anilinoquinolines were identified as potent and narrow spectrum inhibitors of the cyclin G associated kinase (GAK), an important regulator of viral and bacterial entry into host cells. Optimization of the 4-anilino group and the 6,7-quinoline substituents produced GAK inhibitors with nanomolar activity and over 50,000-fold selectivity relative to other members of the numb-associated kinase (NAK) sub-family. These compounds may be useful tools to explore the therapeutic potential of GAK in prevention of a broad range of infectious diseases.
- Published
- 2017
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38. Reverse acknowledgment (ra) scheme: fast detection of retransmission failures for SR-ARQ.
- Author
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Jechan Han, Beomjoon Kim, Dongmin Kim, and Jaiyong Lee
- Abstract
This letter proposes a simple modification called reverse acknowledgement (RA) scheme to a negative acknowledgement (NAK)-based selective repeat automatic repeat request (SR-ARQ) protocol for its fast loss recovery. By adopting the RA scheme, a NAK-based SR-ARQ receiver can detect and recover retransmission failures without invoking retransmission timeouts (RTOs). By OPNET simulations, we evaluate the performance of the RA scheme in terms of the transport delay and re-sequencing delay and show that the RA scheme considerably improves the performance of NAK-based SR-ARQ [ABSTRACT FROM PUBLISHER]
- Published
- 2006
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39. Primary refractoriness to platelet transfusion caused by Naka antibody alone.
- Author
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Fujino, H., Ohta, K., Taniue, A., Nagao, N., Hino, M., Yamane, T., Koh, K.-R., Takeoka, Y., Hirose, A., Aoyama, Y., Nakamae, H., Terada, Y., Takubo, T., and Tatsumi, N.
- Subjects
- *
BLOOD platelet receptors , *BLOOD platelet transfusion , *APLASTIC anemia , *DISEASE risk factors - Abstract
Background and Objectives Anti-Naka, a platelet-specific antibody, occasionally causes platelet-transfusion refractoriness (PTR) together with human leucocyte antigen (HLA) antibodies. Anti-Naka usually appears after frequent platelet transfusions or pregnancy. We report the first case of PTR caused by anti-Naka alone. Materials and Methods A 19-year-old male patient with testicular tumour showed PTR when receiving his first transfusion of platelets. Screening for platelet antigens and platelet antibodies revealed that he had type I CD36 (Naka) deficiency and that anti-Naka, but not anti-HLA, was present before he received his first transfusion. Results The transfusion of Naka-negative, but HLA non-selected, platelets was effective in raising the platelet count. Conclusion Clinically significant Naka antibody was present as naturally occurring antibody in a platelet glycoprotein IV (CD36)-negative non-transfused male patient. [ABSTRACT FROM AUTHOR]
- Published
- 2001
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- View/download PDF
40. Out-of-pile testing of the CALIPSO irradiation device for the Jules Horowitz Reactor
- Author
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Moulin, D., Charvet, P., Challet, F., Chaumont, G., amplexor, amplexor, CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)
- Subjects
[PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th] ,Test ,[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] ,[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex] ,Sodium ,Reactor ,Pump ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,NaK ,Material ,Electromagnetic ,Potassium ,Device ,Irradiation - Abstract
International audience; The CALIPSO device is a NaK liquid metal loop for material irradiation in the core of the Jules Horowitz Reactor. A prototype for out-of pile testing was manufactured and a specific experimental facility called SOPRANO was built at the CEA Cadarache centre. Since September 2013, the qualification of the prototype over all its operating range has been carried out.After a short recall on the CALIPSO device and its operating principle, the main results of the experimental campaigns are presented in this paper. The electromagnetic pump showed very good time stability and reproducibility all along the campaigns to control NaK flowrate up to 0.5 kg/s.Concerning thermal behaviour, the modularity of the heat exchanger is very efficient to enlarge the temperature operating range. For instance, the targeted 450°C NaK temperature was obtained with the shorter heat exchanger configuration. Besides, by controlling the electrical power parameters, one could flatter the NaK temperature profile in the test channel down a few degrees over the 765 mm heating length of the electrical rod.These experimental campaigns were necessary to qualify the overall behaviour of CALIPSO and to characterize the main components. Most of the results are consistent with the expected values. The objective of reducing the thermal gradient in the flowing NaK along the sample zone has been achieved. Therefore, it confirms the adequate design of CALIPSO to perform irradiation of material samples with an accurate control of the coolant temperature conditions over a large range of heating power.
- Published
- 2016
41. Mixing of 0(+) and 0(-) observed in the hyperfine and Zeeman structure of ultracold Rb-2 molecules
- Author
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Deiss, Markus, Drews, Bjoern, Denschlag, Johannes Hecker, and Tiemann, Eberhard
- Subjects
spin–orbit coupling ,spectroscopy ,k-2 ,Atoms ,Effect of low temperatures on ,triplet ,hyperfine structure ,coupled electronic states ,Spektroskopie ,nak ,Zeeman-Effekt ,Low temperatures ,ddc:530 ,Spectroscopy ,Hyperfeinstruktur ,DDC 530 / Physics ,dipole transitions ,coupled channel calculations ,resolution ,Zeeman effect ,Ultrakaltes Molekül ,spin-orbit coupling ,Hyperfine structure ,Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik ,ultracold molecules ,Molecules - Abstract
We study the combination of the hyperfine and Zeeman structure in the spin–orbit coupled ${A}^{1}{\Sigma }_{u}^{+}-{b}^{3}{\Pi }_{u}$ complex of ${}^{87}{\mathrm{Rb}}_{2}$. For this purpose, absorption spectroscopy at a magnetic field around $B=1000$ G is carried out. We drive optical dipole transitions from the lowest rotational state of an ultracold Feshbach molecule to various vibrational levels with ${0}^{+}$ symmetry of the $A-b$ complex. In contrast to previous measurements with rotationally excited alkali-dimers, we do not observe equal spacings of the hyperfine levels. In addition, the spectra vary substantially for different vibrational quantum numbers, and exhibit large splittings of up to $160$ MHz, unexpected for ${0}^{+}$ states. The level structure is explained to be a result of the repulsion between the states ${0}^{+}$ and ${0}^{-}$ of ${b}^{3}{\Pi }_{u}$, coupled via hyperfine and Zeeman interactions. In general, ${0}^{-}$ and ${0}^{+}$ have a spin–orbit induced energy spacing Δ, that is different for the individual vibrational states. From each measured spectrum we are able to extract Δ, which otherwise is not easily accessible in conventional spectroscopy schemes. We obtain values of Δ in the range of $\pm 100$ GHz which can be described by coupled channel calculations if a spin–orbit coupling is introduced that is different for ${0}^{-}$ and ${0}^{+}$ of ${b}^{3}{\Pi }_{u}$., publishedVersion
- Published
- 2015
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- View/download PDF
42. To NACK or not to NACK? Negative Acknowledgments in Information-Centric Networking
- Author
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Cesar Ghali, Mauro Conti, Gene Tsudik, and Alberto Compagno
- Subjects
FOS: Computer and information sciences ,Computer science ,Computer security ,computer.software_genre ,Public-key cryptography ,Computer Science - Networking and Internet Architecture ,NACK ,Information-centric networking ,content-centric networking ,information-centric networking ,named-data networking ,negative acknowledgement ,security considerations ,computer networks and communications ,hardware and architecture ,software ,Networking and Internet Architecture (cs.NI) ,business.industry ,Network layer ,Flooding (computer networking) ,The Internet ,business ,Internetworking ,computer ,Computer network ,NAK - Abstract
Information-Centric Networking (ICN) is an internetworking paradigm that offers an alternative to the current IP\nobreakdash-based Internet architecture. ICN's most distinguishing feature is its emphasis on information (content) instead of communication endpoints. One important open issue in ICN is whether negative acknowledgments (NACKs) at the network layer are useful for notifying downstream nodes about forwarding failures, or requests for incorrect or non-existent information. In benign settings, NACKs are beneficial for ICN architectures, such as CCNx and NDN, since they flush state in routers and notify consumers. In terms of security, NACKs seem useful as they can help mitigating so-called Interest Flooding attacks. However, as we show in this paper, network-layer NACKs also have some unpleasant security implications. We consider several types of NACKs and discuss their security design requirements and implications. We also demonstrate that providing secure NACKs triggers the threat of producer-bound flooding attacks. Although we discuss some potential countermeasures to these attacks, the main conclusion of this paper is that network-layer NACKs are best avoided, at least for security reasons., 10 pages, 7 figures
- Published
- 2015
43. Study on the Effects of Liquid Thermal Media on the Irradiation Capsuleof High-Temperature Materials
- Author
-
Sung Ryul Kim, Seong Woo Yang, Man Soon Cho, and Kee Nam Choo
- Subjects
Materials science ,Article Subject ,business.industry ,Capsule ,chemistry.chemical_element ,Vibration ,Nuclear Energy and Engineering ,chemistry ,Aluminium ,Thermal ,Forensic engineering ,Irradiation ,lcsh:Electrical engineering. Electronics. Nuclear engineering ,Composite material ,Wall thickness ,business ,lcsh:TK1-9971 ,Thermal energy ,NAK - Abstract
Irradiation tests of materials at HANARO have usually been conducted using a standard capsule at temperatures of about 300°C for irradiation of materials used at PWR. Thus, the standard capsule uses aluminum as the specimen holder, which acts to dissipate the thermal energy. Future nuclear systems such as a VHTR and SFR require the irradiation tests at a relatively high temperature. As an alternative to aluminum which has been used as the thermal media in a standard material capsule, the characteristics of liquid metals such as NaK and LBE are reviewed. The temperatures of the capsule are affected by the variation of parameters such as the gap and wall thickness of the container. In particular, the external gap is most important in determining the temperature of the specimen. LBE raises the temperature of the specimen higher than NaK at the same configuration of the capsule. Thus, LBE can lessen the gap of the parts and reduce the vibration for a stable long-term test in reactor.
- Published
- 2015
44. Haberler
- Author
-
TKD
- Subjects
Bilgi Bankası ,Fatma-Hüseyin Ekşi Kütüphanesi ,NAK ,Kitapsız kütüphane ,TTOK ,Haberler ,lcsh:Z ,lcsh:Bibliography. Library science. Information resources - Published
- 2005
45. First record of the genus Fagineura Vikberg & Zinovjev (Hymenoptera, Tenthredinidae) with descriptions of two new species from China.
- Author
-
Liu M, Li Z, and Wei M
- Abstract
Fagineura Vikberg & Zinovjev, 2000 is recorded from China for the first time. Two species of Fagineura are described as new, F.flactoserrula sp. n. and F.xanthosoma sp. n. species is provided, based on sequences of the COI and NaK genes.Fagineura worldwide is provided, now including four species. In addition, a simple phylogenetic analysis of Fagineura species is provided, based on sequences of the COI and NaK genes.
- Published
- 2019
- Full Text
- View/download PDF
46. EBR-I Tour
- Author
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Miley, Don
- Published
- 2011
47. Dynamic NAK timer algorithm to improve delivery latency of CCSDS file delivery protocol in Deferred NAK mode
- Author
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Josephine Kohlenberg, Mahendiran Prathaban, Département Réseaux et Services de Télécommunications (RST), Institut Mines-Télécom [Paris] (IMT)-Télécom SudParis (TSP), Services répartis, Architectures, MOdélisation, Validation, Administration des Réseaux (SAMOVAR), and Centre National de la Recherche Scientifique (CNRS)
- Subjects
Dynamic NAK timer algorithm ,Computer science ,Aerospace computing ,Delivery latency ,Interplanetary space links ,Telecommunication standards CCSDS file delivery protocol ,02 engineering and technology ,[INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI] ,0203 mechanical engineering ,Deferred NAK mode ,0202 electrical engineering, electronic engineering, information engineering ,Latency (engineering) ,Space communication links ,Computer networks ,Consultative Committee for Space Data Systems space communication ,020301 aerospace & aeronautics ,Mission configurations ,business.industry ,020206 networking & telecommunications ,CCSDS File Delivery Protocol ,Timer ,business ,Algorithm ,Protocols ,NAK ,Computer network - Abstract
International audience; The Consultative Committee for Space Data Systems (CCSDS) File Delivery Protocol (CFDP) is a new international standard developed by the space agencypsilas to meet the growing space communication need for effective transfer of information in a wide variety of mission configurations of inter-planetary space links. The performance of CFDP in the deferred NAK mode has been evaluated in a theoretical manner. The delivery latency mainly depended on timer used in both sender and receiver. In this paper we have proposed a dynamic NAK timer algorithm for CFDP in deferred NAK mode under bandwidth constrain. Then we have implemented and validated the algorithm in NS and also presented its performance results and analysis
- Published
- 2009
- Full Text
- View/download PDF
48. Proposed Alaska Mine Faces Roadblock Over Environmental Concerns.
- Author
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Puko, Timothy
- Subjects
- *
MINES & mineral resources , *FISHERIES , *COPPER mining - Published
- 2020
49. Group size estimation for hybrid satellite/terrestrial reliable multicast
- Author
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F. de Belleville, Jean-Yves Tourneret, Christian Fraboul, Laurent Dairaine, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE), Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Laboratoire de recherche en télécommunications spatiales et aéronautiques - TéSA (FRANCE), Télécommunications Spatiales et Aéronautiques - Telecommunications for Space ant Aeronautics (TéSA), Laboratoire de recherche coopératif dans les télécommunications spatiales et aéronautiques (TESA), Département de Mathématiques, Informatique, Automatique (DMIA), Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), Réseaux, Mobiles, Embarqués, Sans fil, Satellites (IRIT-RMESS), Institut de recherche en informatique de Toulouse (IRIT), Université de Toulouse (UT)-Université de Toulouse (UT)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Toulouse Mind & Brain Institut (TMBI), Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Institut National Polytechnique (Toulouse) (Toulouse INP), and International Federation for Information Processing (IFIP) - TC6 (Communications Systems)
- Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR] ,Large Group ,Multicast ,Group (mathematics) ,Estimator ,[SPI.AUTO]Engineering Sciences [physics]/Automatic ,Maximum likelihood principle ,Geography ,Architectures Matérielles ,Satellite ,Transport layer ,Reliable multicast ,Electronic engineering ,Algorithm ,Automatique / Robotique ,Estimation ,NAK ,Reliable Transport - Abstract
International audience; This paper addresses the problem of group size estimation for hybrid satellite/terrestrial multipoint communications. Estimators based on the maximum likelihood principle are investigated. These estimators assume that a Nack suppression mechanism is implemented at transport layer. The performance of these estimators is studied theoretically and via simulations. The integration of an appropriate group size estimator in a transport mechanism is finally considered.
- Published
- 2004
- Full Text
- View/download PDF
50. Ab initio calculations of dipole polarizabilities of Na and K in their 32D-state and determination of long-range coefficients for S+D molecular states of Na2, K2, and NaK
- Author
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Michel Rérat, Mohammadou Mérawa, Béatrice Honvault-Bussery, Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux (IPREM), and Université de Pau et des Pays de l'Adour (UPPA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Range (particle radiation) ,010304 chemical physics ,Chemistry ,General Physics and Astronomy ,State (functional analysis) ,01 natural sciences ,[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry ,Dipole ,Ab initio quantum chemistry methods ,Excited state ,0103 physical sciences ,Physical and Theoretical Chemistry ,Atomic physics ,010306 general physics ,Dispersion (chemistry) ,Wave function ,NAK - Abstract
cited By 11; International audience; Dynamic polarizabilities of Na and K in their first excited states are calculated with a time-dependent gauge-invariant (TDGI) method, using one-electron wave functions and pseudo-potentials. The values obtained for Na and K in the low-lying S and P states are compared to our previous all-electron results. Then, the dynamic polarizabilities of Na and K in their 3d 2D state are calculated in order to determine the long-range dispersion coefficients for the dissociative S+D states of Na2, K2, and NaK. © 1998 American Institute of Physics.
- Published
- 1998
- Full Text
- View/download PDF
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