By means of a model calculation an absolute determination of the lattice structure of lithium hydride crystal has been carried out. During the course of the investigation first the electron structure of the nearest and later on of the more distant neighbo...

Determination of absolute configuration (AC) is one of the most challenging features in the structure elucidation of chiral natural products, especially those with complex structures. With revolutionary advancements in the area of quantum chemical calculations of chiroptical spectroscopy over the pa...

... Title : An Investigation of Some Dimensional Stability Tests Applied to ... are determined by polymer structure, foam density, and absolute humidity of ...

The basic parameters describing the internal structure of rotating convfiurations are calculated on the basis of Einstein's gravitation theory. The influence of rotation on the absolute gravitational mass defect is determined. (auth)

... Title : DETERMINATION AND APPLICATION OF ABSOLUTE TRANSITION PROBABILITIES AND LIFETIMES OF ATOMS, MOLECULES, AND IONS ...

Page 1. Structural Health Monitoring of Strategically Tuned Absolutely Resilient Structures (STARS) Stephen A. Marotta ...

Strictamine (4), strictalamine (6), and nor-C-fluorocurarine (8) have been isolated from Rhazya stricta. X-ray structure determination and chemical correlation establish the structures and absolute configurations of 4, 6, and also, by extension, of the Picralima bases, especially with respect to the configurations ...

The determination of molecular absolute configuration from an X-ray analysis for structures that contain only light elements is challenging owing to the weak anomalous dispersion signal. The achievable precision of the Flack x parameter for such structures is therefore limited, especially when the independent-atom ...

It is argued that there should be an agreement as to what conventions to use in determining absolute

Three new cannabichromanone derivatives were isolated from high potency cannabis, along with the known cannabichromanone. Full spectroscopic data, including the use of electronic circular dichroism and Mosher ester analysis to determine the absolute configuration of these compounds, are reported. All isolates were tested for antimicrobial, antimalarial, ...

... Accession Number : AD0417929. Title : ABSOLUTE STABILITY OF CUBIC CRYSTAL STRUCTURES OF HEAVY RARE GAS ATOMS II,. ...

Sequences of notes contain several different types of pitch cues, including both absolute and relative pitch information. What factors determine which of these cues are used when learning about tone sequences? Previous research suggests that infants tend to preferentially process absolute pitch patterns in continuous tone sequences, ...

The absolute hydration free energy of the proton, DGhyd298(H+), is one of the fundamental quantities for the thermodynamics of aqueous systems. Its exact value remains unknown despite extensive experimental and computational efforts. We report a first-principles determination of DGhyd298(H+) by using the latest developments in electronic ...

... ADA286670. Title : Absolute Determination of the Acceleration of Gravity at the All-Union Scientific Research Institute of Metrology,. ...

... Title : Absolute Determination of Elastic Constants and Stresses from Ultrasonic Group Velocity Data,. Corporate Author : ...

Neutron diffraction has been used to monitor the absolute stereochemistry of an enzymatic reaction. (-)(2S)malic-3-d acid was prepared by the action of fumarase on fumaric acid in D/sub 2/O. After a large number of cations were screened, it was found that (+)(R)..cap alpha..-phenylethylamine forms the large crystals necessary for a neutron diffraction analysis. The subsequent ...

on a 1% agarose gel. Cell transfection and laser scanning confocal microscopy HCT116 human colon images of modified SEP53 expression in the human colonic carcinoma cell line HCT116. Deletion

A review is made of the various experimental methods used to determine the physics of natural uranium graphite, lattices. Integral lattice experiments reviewed include absolute and differential effective cross section measurements by activation methods and analysis of irradiated fuels and fine structure measurements. A number of ...

... Chu, PC, 1995: P-vector method for determining absolute velocity from ... RJ, SJ Lubker, JD Hiscox, SD Woodruff, RL Jenne, DH Joseph, PM Steurer ...

Data collected at 9 deg 30'N on the East Pacific Rise has previously been inverted for the P-wave velocity and attenuation structure of the cmst. Delay time tomography was used to determine velocities and the results combined with spectral slope estimates...

A set of three computer programs is reported which allow for the deconvolution of overlapping molecular electronic state structure in electron energy-loss spectra, even in highly perturbed systems. This procedure enables extraction of absolute differentia...

The absolute radiative widths for E-1 and M-1 transitions in /sup 46/Sc were determined by neutron time-of-flight spectrometry. The level structure of /sup 46/Sc to 3 MeV has been studied by combining (n,..gamma..) data with previous charged particle data. As in /sup 36/Cl, scandium shows enhanced M-1's. 5 references.

In an attempt to determine the cause of repeated fish kills in an estuarine aquaculture facility in Maryland, a toxin was isolated from Karlodinium veneficum with hemolytic, cytotoxic, and ichthyotoxic properties, which was referred to as karlotoxin-2 (KmTx2). The structure of KmTx2 was elucidated by means of detailed 1D and 2D NMR spectra including 2D ...

Ten new diterpenes, 1�10, having a dolabellane skeleton were isolated from a Colombian gorgonian coral of the genus Eunicea. Their structures, as well as those of known compounds 11�18, were determined based on spectroscopic analysis and, in some instances, by chemical conversion and X-ray crystallographic analysis. The absolute ...

This test operations procedure (TOP) delineates general test and specific subtest procedure required to determine the technical performance of absolute altimeters. Absolute altimeters which are used to measure vertical separation between the aircraft and ...

Narrow bandgap conjugated polymers in combination with fullerene acceptors are under intense investigation in the field of organic photovoltaics (OPVs). The open circuit voltage, and thereby the power conversion efficiency, of the devices is related to the offset of the frontier orbital energy levels of the donor and acceptor components, which are widely determined by cyclic ...

The TM multispectral scanner system was calibrated in an absolute manner before launch. To determine

... Presented in the report are the results of determination of the absolute spectral sensitivity of photographic films developed by Gosniikhimfotoproyekt ...

New bisnorditerpenes, hedaols A (1), B (2), and C (3), were isolated from the Japanese brown alga Sargassum sp. Their structures were determined by spectroscopic analysis. The absolute stereocenter of 1 was determined by the modified Mosher's method. Hedaols showed low cytotoxicity against P388 cells. PMID:11374968

... Accession Number : ADA205041. Title : Implications of Conservation Equations for the Determination of Absolute Velocities. ...

... BASED ON THE CHANGE IN ABSOLUTE INTENSITY OF ... A METHOD FOR DETERMINING THE TEMPERATURE STABILITY OF TRANSPARENT ...

An attempt is presented to adapt sampling procedures for stereological investigation of rat kidney. The proposed experimental design considers the zonal construction, in particular the structural and osmotic features of this organ. Every zone is treated as an own entity inregard to sample collection. In order to uncover possibly existing preferential orientation of ...

Macropodumines B and C (1, 2) are fused pentacyclic alkaloids previously isolated from the Chinese medicinal plant Daphniphyllum macropodum. Macropodumine B (1) possesses an amazing structural feature of a cyclopentadienyl carbanion, stabilized as a zwitterion by an internal iminium cation, which was confirmed by X-ray diffraction analysis. On the basis of the X-ray geometry, ...

The recently completed OMEGA 64 upgrade at the Lab for Laser Energetics (LLE) at the University of Rochester required a recalibration of the DD neutron absolute yield detector. Measurement of DD neutron absolute yield is crucial to determining fuel densities. The method used to measure absolute DD yield is the ...

Sotolon (1) and maple furanone (2) are naturally occurring chiral furanones. These 5-substituted-2(5H)-furanones are industrially significant aroma compounds due to their characteristic organoleptic properties and extraordinarily low odor thresholds. Each enantiomer of 1 and 2 was successfully obtained by preparative enantioselective supercritical fluid chromatography. The ...

... 4. TITLE AND SUBTITLE P-Vector Method for Determining Absolute Velocity From Hydrographic Data 5a. CONTRACT NUMBER 5b. ...

... ADA480668. Title : P-Vector Method for Determining Absolute Velocity From Hydrographic Data. Descriptive Note : Journal article. ...

A method is described whereby the absolute radiative quantum efficiency of paramagnetic ions in liquids or solids can be determined from photoacoustic measurements. 1 figure.

Six novel monoterpene chromane esters were isolated from the aerial parts of Peperomia obtusifolia (Piperaceae) using chiral chromatography. This is the first time that chiral chromane esters of this kind, ones with a tethered chiral terpene, have been isolated in nature. Due to their structural features, it is not currently possible to assess directly their ...

The radiative lifetimes of 39 levels in V I have been measured by the method of laser-induced fluorescence from sputtered metal vapor. Emission branching ratios have been measured for these levels to determine absolute transition probabilities for 208 lines in the wavelength range 3180 � to 16,400 �. These transition probabilities are used together ...

The evolution of the surface temperature of flash-illuminated layered structures was studied by means of photothermal radiometry, the finite element method, and the Green's formalism. The potential of a simple tabletop experiment to extract the sequence and thickness of the layers was investigated. Keeping the complexity low, only one parameter can be ...

) variability (as estimated by the relative standard deviation rsd) is more than one of absolute values of the density, or the solar wind speed. We conclude that the structures with small variations (rsd structures with large variations (rsd > 20%) have a large Astrophysics and Space Science 277: 323�324, 2001

A method for the production of t-butoxy radicals by the photolysis of t-butyl hypochlorite was employed to determine the absolute rate of combination of t-butoxy radicals at room temperature and to determine the absolute rate of hydrogen atom abstraction ...

The status of absolute gravimetry is discussed. An easily portable apparatus for the absolute determination of the acceleration of gravity is described. Laboratory tests of this instrument indicate that a measurement accuracy of six parts in a billion is achieved. This corresponds to an equivalent height sensitivity of about 2 cm.

The absolute configuration of small crystallizable molecules can be determined with anomalous X-ray diffraction as shown by Bijvoet in 1951. For the majority of compounds that can neither be crystallized nor easily be converted into crystallizable derivatives, stereocontrolled organic synthesis is still required to establish their ...

The absolute configuration of small crystallizable molecules can be determined with anomalous X-ray diffraction as shown by Bijvoet in 1951. For the majority of compounds that can neither be crystallized nor easily be converted into crystallizable derivatives, stereocontrolled organic synthesis is still required to establish their ...

For a three-dimensional shape measurement system with a single projector and multiple cameras, registering patches from different cameras is crucial. Registration usually involves a complicated and time-consuming procedure. We propose a new method that can robustly match different patches via absolute phase without significantly increasing its cost. For y and z coordinates, ...

For a three-dimensional shape measurement system with a single projector and multiple cameras, registering patches from different cameras is crucial. Registration usually involves a complicated and time-consuming procedure. We propose a new method that can robustly match different patches via absolute phase without significantly increasing its cost. For y and z coordinates, ...

... organophosphate inhibitors. The chiral inhibitors were resolved enantiomers of known absolute stereochemistry. This approach ...

We report on the synthesis and investigation of two diastereomers (5a and 5b) of a new bicalutamide analog with an asymmetric carbon atom and a chiral sulfoxide group. These bicalutamide analogs are novel androgen receptor antagonists with biological activities that depend significantly on the configuration of their stereogenic centers. We determined the ...

We present results on the measurement of the Drell-Yan absolute cross section and of the shape of the nucleon structure functions by the analysis of massive dimuon events produced by antiprotons at 150 GeV and by protons at 150 and 200 GeV. Good agreement is found with the results of the neutrino deep inelastic scattering (DIS) experiments, for the shape ...

The sex pheromone emitted by the female oleander scale, Aspidiotus nerii (Homoptera, Diaspididae), has been isolated and characterized as (1R,2S)-cis-2-isopropenyl-1-(4?-methyl-4?-penten-1?-yl)cyclobutaneethanol acetate by using advanced MS and NMR spectroscopic methods, as well as a variety of microderivatization sequences. The structure has been confirmed by stereo- and ...

... the photon yields in the ... Descriptors : *CHEMICAL REACTIONS, *PHOTONS, *CHEMILUMINESCENCE ... LASERS, FLUORINE, YIELD, NITROGEN ...