gebhart/patrepeval huggingface dataset:
Organoiron complexes in organic synthesis. 33. Tricarbonylcyclohexadienyliron complexes as aryl cation equivalents: a formal synthesis of (.+-.)-O-methyljoubertiamine (1984)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganoiron complexes in organic synthesis. 33. Tricarbonylcyclohexadienyliron complexes as aryl cation equivalents: a formal synthesis of (.+-.)-O-methyljoubertiamineAnthony J. Pearson, Ian C. Richards, and Derek V. GardnerCite this: J. Org. Chem. 1984, 49, 21, 3887–3891Publication Date (Print):October 1, 1984Publication History Published online1 May 2002Published inissue 1 October 1984https://pubs.acs.org/doi/10.1021/jo00195a003https://doi.org/10.1021/jo00195a003research-articleACS PublicationsRequest reuse permissionsArticle Views283Altmetric-Citations19LEARN 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
Detection of Central Nervous System Relapse in Acute Leukemia by Multiparameter Flow Cytometry of DNA, RNA, and CALLAa (1986)

DNA/RNA flow cytometry studies were performed on the spinal fluid samples of thirty patients with acute leukemia or lymphoma at the time of clinical central nervous system relapse, and compared with similar studies of 56 patients (98 specimens) who had leukemia in remission with no evidence of CNS disease. Twelve of the 30 patients with CNS involvement had cells with abnormal DNA content in the spinal fluid (40%); the remaining eighteen had cells with diploid DNA content. In the group of 18 with diploid DNA, 10 had other abnormalities detected by flow cytometry. These included eight patients with acute leukemia who had cells with high RNA content, and two patients with non-Hodgkin's lymphoma who had markedly increased proliferation. Of the 22 patients studied by conventional cytology nine were negative for malignant cells, and in eight of these patients flow cytometry studies of DNA/RNA demonstrated abnormalities. Common ALL antigen was demonstrated by flow cytometry in three out of five cases studied. Thus, abnormal DNA content, increased RNA content, increased proliferation and/or expression of the cell surface antigen CALLA identified CNS relapse by flow cytometry in 22 of 30 patients with acute leukemia or lymphoma. The technique appears to be at least as sensitive as conventional cytology and identifies CNS relapse in some patients with negative cytology.
Trust-based security in pervasive computing environments (2001)

Traditionally, stand-alone computers and small networks rely on user authentication and access control to provide security. These physical methods use system-based controls to verify the identity of a person or process, explicitly enabling or restricting the ability to use, change, or view a computer resource. However, these strategies are inadequate for the increased flexibility that distributed networks such as the Internet and pervasive computing environments require because such systems lack central control and their users are not all predetermined. Mobile users expect to access locally hosted resources and services anytime and anywhere, leading to serious security risks and access control problems. We propose a solution based on trust management that involves developing a security policy, assigning credentials to entities, verifying that the credentials fulfill the policy, delegating trust to third parties, and reasoning about users' access rights. This architecture is generally applicable to distributed systems but geared toward pervasive computing environments.
A coordinated motion planner among moving machines and objects (2002)

In this paper a coordinated motion planner is proposed for coordinating collision-free motion among dynamic moving objects or machines in a shared space. Based on the concept of path-velocity decomposition proposed by Kant and Zucker (1988), an algorithm is developed for evaluating performance of different motion strategies. The developed motion planner will coordinate collision-free motion for multiple uncontrollable/controllable objects moving in a shared environment. A dynamic object can be a vehicle or multibody object such as a robot. The applicability of the proposed approach is demonstrated through examples. The author's result shows that multiple controllable machines can be controlled and scheduled efficiently in avoiding collision with uncontrollable machines and objects in an environment.
Ferromagnetism in ZnO Nanocrystals: Doping and Surface Chemistry (2010)

Room temperature ferromagnetic ordering is observed in chemically grown ZnO nanocrystals. Nanocrystals are simultaneously capped by two different organic molecules inducing p-type and n-type defects. A saturation magnetization of 0.008 emu/g is achieved at 300 K. Incorporation of Mn2+ ions at substitutional sites in nanocrystals gives rise higher saturation magnetic moment at lower doping level. ZnO nanocrystals codoped with Mn2+ and Co2+ and prepared under identical conditions revealed an increase in saturation magnetization. However, the saturation magnetic moment remains lower than that obtained for Co2+-doped ZnO nanocrystals prepared by the same method. An increase in saturation magnetization was invariably associated with quenching of photoluminescence emission. These findings reaffirm that magnetism in nanocrystals is a defect induced phenomenon that can be controlled by choice of capping agent as well as incorporation of the transition metal impurity. Magnetization as a function of temperature [M(T)] curve is discussed in view of available reports on the global exchange mechanism in these ferromagnetic nanocrystals.
Acoustic microscopy with mechanical scanning—A review (1979)

Acoustic waves in liquids are known to have wavelengths comparable to that of visible light if the frequency is in the gigahertz range. The phenomena of Brillouin scattering in liquids is based on such waves. In helium near 2 K acoustic waves with a wavelength of 2000 Å were studied some ten years ago at UCLA. It follows from these observations that an imaging system based on acoustic radiation with a resolving power competitive with the optical microscope is within reach if an ideal lens free from aberrations could be found. Such a lens, which was so elusive at the beginning, is now a simple device and it is the basic component in the acoustic microscope that forms the basis for this review. In this article we will establish the characteristic properties of this new instrument. We will review some of the simple properties of acoustic waves and show how a single spherical surface formed at a solid liquid interface can serve as this ideal lens free from aberrations and capable of producing diffraction limited beams. When this is incorporated into a mechanical scanning system and excited with acoustic frequencies in the microwave range images can be recorded with acoustic wavelengths equal to the wavelength of visible light. We will present images that show the elastic properties of specimens selected from the fields of material science, integrated circuits, and cell biology. The information content in these images will often exceed that of the optical micrographs. In the reflection mode we illuminate the smooth surface of a crystalline material with a highly convergent acoustic beam. The reflected field is perturbed in a unique way that is determined by the elastic properties of the reflecting surface and it shows up in the phase of the reflected acoustic field. There is a distinct and characteristic response at the output when the spacing between the object and the lens is varied. This behavior in the acoustic ieflection microscope provides a rather simple and direct means for monitoring the elastic parameters of a solid surface. It is easy to distinguish between different materials, to determine the layer thickness, and to display variations in the elastic constants on a microscopic scale. These features lead us to believe there is a promising future for the field of acoustic microscopy.
Health-Related Quality of Life Impacts Mortality but Not Progression to End-Stage Renal Disease in Pre-Dialysis Chronic Kidney Disease: A Prospective Observational Study (2016)

Impaired HRQL is common in the pre-dialysis CKD population. Reduced HRQL, as demonstrated by problems with self-care or a lower EQ-5Dindex score, is associated with a higher risk for death but not ESRD. Multiple factors influence these aspects of HRQL but renal function, as measured by eGFR and ACR, are not among them.
Mobile decision support and business intelligence: an overview☆ (2013)

Decision-making occurs in many places. Mobile decision support provides a technology solution that enables decision-makers to bring powerful decision-aiding capabilities with them while on the go. Business intelligence and data-driven decision support especially benefit from mobile computing. The effectiveness of mobile decision support is constrained by the features of applications, the quality of data used and the ability of decision-makers to interpret information and act upon it in real time. The constraints imposed by hardwired, desktop computing no longer exist. Constraints imposed by application design, data limitations and decision support users themselves remain a concern of designers. Basic decision support concepts must be understood to develop new applications that use the capabilities of mobile devices, cloud-based delivery, and real-time alerts and interactions.
Essential Oils-Loaded Electrospun Biopolymers: A Future Perspective for Active Food Packaging (2020)

The growth of global food demand combined with the increased appeal to access different foods from every corner of the globe is forcing the food industry to look for alternative technologies to increase the shelf life. Essential oils (EOs) as naturally occurring functional ingredients have shown great prospects in active food packaging. EOs can inhibit the growth of superficial food pathogens, modify nutritious values without affecting the sensory qualities of food, and prolong the shelf life when used in food packaging as an active ingredient. Since 2016, various reports have demonstrated that combinations of electrospun fibers and encapsulated EOs could offer promising results when used as food packaging. Such electrospun platforms have encapsulated either pure EOs or their complexation with other antibacterial agents to prolong the shelf life of food products through sustained release of active ingredients. This paper presents a comprehensive review of the essential oil-loaded electrospun fibers that have been applied as active food packaging material.
Kitaigorodsky Revisited: Polymorphism and Mixed Crystals of Acridine/Phenazine (2014)

Non-stoichiometric molecular mixed crystals have potential as functional materials, the properties of which can be tailored by rationally changing their composition. The guidelines for their preparation were summarized over thirty years ago by Alexander Kitaigorodsky. Here those principles are revised in light of new studies on the acridine/phenazine system, and solvent-assisted grinding is presented as a convenient synthetic procedure to afford a more homogeneous product than traditional solvent-evaporation methods. Finally, the proposed prerequisite of crystal isostructurality/isomorphicity for the pure compounds, which seems to be violated in the present case, is discussed.
Chiroptical switches and sensors based on ligand conformational changes in labile coordination complexes. (2000)

A series of molecules have been developed that give significantly differentiated circular dichroic signals upon presentation of a metal ion, exchange of metal ion, or change in oxidation state. These properties have led to prototypes of molecular sensors for metal ions and redox-mediated chiroptical switches. In some complexes, the CD signal arises by an excitonic coupling mechanism, affording further information about ligand conformation or absolute configuration.
Saturated Fats: A Perspective from Lactation and Milk Composition (2010)

For recommendations of specific targets for the absolute amount of saturated fat intake, we need to know what dietary intake is most appropriate? Changing agricultural production and processing to lower the relative quantities of macronutrients requires years to accomplish. Changes can have unintended consequences on diets and the health of subsets of the population. Hence, what are the appropriate absolute amounts of saturated fat in our diets? Is the scientific evidence consistent with an optimal intake of zero? If not, is it also possible that a finite intake of saturated fats is beneficial to overall health, at least to a subset of the population? Conclusive evidence from prospective human trials is not available, hence other sources of information must be considered. One approach is to examine the evolution of lactation, and the composition of milks that developed through millennia of natural selective pressure and natural selection processes. Mammalian milks, including human milk, contain 50% of their total fatty acids as saturated fatty acids. The biochemical formation of a single double bond converting a saturated to a monounsaturated fatty acid is a pathway that exists in all eukaryotic organisms and is active within the mammary gland. In the face of selective pressure, mammary lipid synthesis in all mammals continues to release a significant content of saturated fatty acids into milk. Is it possible that evolution of the mammary gland reveals benefits to saturated fatty acids that current recommendations do not consider?
Effective Binding of a Phosphatidylserine-Targeting Antibody to Ebola Virus Infected Cells and Purified Virions (2015)

Ebola virus is responsible for causing severe hemorrhagic fevers, with case fatality rates of up to 90%. Currently, no antiviral or vaccine is licensed against Ebola virus. A phosphatidylserine-targeting antibody (PGN401, bavituximab) has previously been shown to have broad-spectrum antiviral activity. Here, we demonstrate that PGN401 specifically binds to Ebola virus and recognizes infected cells. Our study provides the first evidence of phosphatidylserine-targeting antibody reactivity against Ebola virus.
Phosphonylalkoxyalkyl and Phosphonylalkyl Derivatives of Heterocyclic Bases (1989)

Abstract This review describes chemical syntheses of acyclic nucleotide analogs containing various types of phosphonate grouping, with an emphasis on preparative methods for N-(3-hydroxy-2-phosphonylmethoxypropyl) and N-(2-phosphonylmethoxyethyl) derivatives of purine and pyrimidine bases.
ChemInform Abstract: Sigmatropic Rearrangements of Organoselenium Compounds (2000)

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Laser Properties of an Improved Average-Power Nd-Doped Phosphate Glass (1995)

The Nd-doped phosphate laser glass described herein can withstand 2.3 times greater thermal loading without fracture, compared to APG-1 (commercially-available average-power glass from Schott Glass Technologies). The enhanced thermal loading capability is established on the basis of the intrinsic thermomechanical properties (expansion, conduction, fracture toughness, and Young`s modulus), and by direct thermally-induced fracture experiments using Ar-ion laser heating of the samples. This Nd-doped phosphate glass (referred to as APG-t) is found to be characterized by a 29% lower gain cross section and a 25% longer low-concentration emission lifetime.
3D tolerance modeling and geometric precision analysis of plane features for flexible parts (2018)

Purpose The traditional precision design only takes the influence of geometric tolerance of the parts and does not involve the load deformation in the assembly process. This paper aims to analyze the influence mechanism of flexible parts deformation on the geometric precision, and then to ensure the reliability and stability of the mechanical system. Design/methodology/approach Firstly, this paper adopts the N-GPS to analyze the influence mechanism of flexible parts deformation on the geometric precision and constructs a coupling 3D tolerance mathematical model of the geometric tolerance and the load deformation deviation based on the SDT theory, homogeneous coordinate transformation theory and surface authentication idea. Secondly, the least square method is used to fit the deformation surface of the mating surface under load so as to complete the conversion from the non-ideal element to the ideal element. Findings This paper takes the horizontal machining center as a case to obtain the deformation information of the mating surface under the self-weight load. The results show that the deformation deviation of the parts has the trend of transmission and accumulation under the load. The terminal deformation cumulative amount of the system is up to –0.0249 mm, which indicated that the influence of parts deformation on the mechanical system precision cannot be ignored. Originality/value This paper establishes a comprehensive 3D tolerance mathematical model, which comprehensively considers the effect of the dimensional tolerance, geometric tolerance and load deformation deviation. By this way, the assembly precision of mechanical system can be accurately predicted.
The Oxidation of β-Carotene (1950)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Oxidation of β-CaroteneN. L. Wendler, C. Rosenblum, and M. TishlerCite this: J. Am. Chem. Soc. 1950, 72, 1, 234–239Publication Date (Print):January 1, 1950Publication History Published online1 May 2002Published inissue 1 January 1950https://pubs.acs.org/doi/10.1021/ja01157a065https://doi.org/10.1021/ja01157a065research-articleACS PublicationsRequest reuse permissionsArticle Views223Altmetric-Citations24LEARN 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
Computer supported laboratory reports of experimental work (2002)

Reports on experimental work should be based on a well-documented laboratory report. With the laboratory report we mean the logbook, kept during the experiments. Making such a laboratory report is an important part of the practical courses at our Electrical Engineering faculty in Twente. Nowadays our students write their report on paper. We consider the option to write it directly on the computer so that it can be integrated with managing the measurement results. Doing this however will pose severe requirements to the user friendliness of the software environment. In this paper the idea of an integrated computer environment for doing experimental work is discussed, together with some problems.
Getting the Goods on Virtual Items: A Fresh Look at Transactions in Multi-User Online Environments (2011)

Active accounts for virtual worlds have gone from 414 million in early 2009 to just over one billion in the third quarter of 2010
Brain-Specific Protein C Activation During Carotid Artery Occlusion in Humans (1999)

These findings demonstrate brain-specific protein C activation in humans during carotid occlusion and suggest a protective role for endogenous APC generation during cerebrovascular occlusion.
Analysis of Mechanical and Metallurgical Properties of Friction Stir Butt Welded AA2024 (2013)

This chapter contains sections titled: Introduction Experimental Procedure Results and Discussion Conclusions Acknowledgements
NEW STATE RECORDS OF VASCULAR PLANTS FOR THE SOUTHERN ROCKY MOUNTAIN REGION (2009)

(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
Tree-Like Distributed Computation Environment with Shapp Library (2020)

Despite the rapidly growing computing power of computers, it is often insufficient to perform mass calculations in a short time, for example, simulation of systems for various sets of parameters, the searching of huge state spaces, optimization using ant or genetic algorithms, machine learning, etc. One can solve the problem of a lack of computing power through workload management systems used in local networks in order to use the free computing power of servers and workstations. This article proposes raising such a system to a higher level of abstraction: The use in the .NET environment of a new Shapp library that allows remote task execution using fork-like operations from Portable Operating System Interface for UNIX (POSIX) systems. The library distributes the task code, sending static data on which task force is working, and individualizing tasks. In addition, a convenient way of communicating distributed tasks running hierarchically in the Shapp library was proposed to better manage the execution of these tasks. Many different task group architectures are possible; we focus on tree-like calculations that are suitable for many problems where the range of possible parallelism increases as the calculations progress.
ChemInform Abstract: Gymnodimine, a New Marine Toxin of Unprecedented Structure Isolated from New Zealand Oysters and the Dinoflagellate, Gymnodinium sp. (1996)

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Medical imaging arrays for frequencies above 25 MHz (2003)

A fabrication method has been developed for composite linear arrays operating at a frequency of 30 MHz. The design features dual matching layers, a lens for focusing in the elevation direction, a 2-2 composite with 28 /spl mu/m wide ceramics and 5.3 /spl mu/m polymer widths, and coaxial cable for electrical impedance matching. Bandwidths exceeding 65% and crosstalk values less than -30 dB were measured on prototype arrays. A non-composite 35 MHz design has also been investigated. An interconnect method using a flex circuit and sputtered metal has been tested. Properties were then measured by fitting experimental impedance data to a model using a non-linear regression technique. A k/sub 33/' of 0.63 and an /spl epsiv//sub 33//sup S///spl epsiv//sub 0/ of 1310 were measured for array elements operating at 35 MHz.