However, the development of a continuous NMR logging tool by Numar ( now a subsidiary of Halliburton ) is a promising new technology.

However, other methods such as chiral column chromatography and NMR spectroscopy can now be used for measuring the amount of each enantiomer individually.

However, IR spectroscopy, Raman spectroscopy, and < sup > 13 </ sup > C NMR have been used to investigate bridged carbocation systems.

However, his subject matter and basic themes have remained surprisingly consistent, and these, together with certain key poetic images, may be traced through all his work, including the new jazz experiments.

However, he continued experimenting and lecturing, publishing the results of his experiments in German and Danish periodicals.

However, when applied to data from non-randomized experiments or observational studies, model-based analysis lacks the warrant of randomization.

However, there is scant evidence that he personally performed alchemical experiments.

However, more recent experiments have demonstrated that cells whose centrioles have been removed via laser ablation can still progress through the G < sub > 1 </ sub > stage of interphase before centrioles can be synthesized later in a de novo fashion.

However, in statistics, these terms are usually used for controlled experiments.

However, today many schools use progressive education methods, such as hands on activities and science experiments in Junior High Schools.

However, the chemist Ida Noddack had criticised Fermi's work and had suggested that some of his experiments could have produced lighter elements.

However, since Einstein's death, experiments analogous to the one described in the EPR paper have been carried out, starting in 1976 by French scientists Lamehi-Rachti and Mittig at the Saclay Nuclear Research Centre.

However, scientists are skeptical about the results of these experiments, which are currently disputed.

However, experiments to detect gravitational waves, which may be viewed as coherent states of many gravitons, are underway ( e. g., LIGO and VIRGO ).

However, extensive experiments with it also failed to reproduce the described intensity of Greek fire.

However, those experiments could be either not verified in later experiments, could not be clearly attributed to the radiation effect, or could be attributed to an inappropriate design of the experiment etc.

However, his use of careful controls in his experiments revealed that the lithium ion had a calming effect by itself.

However, the popular description of light being " stopped " in these experiments refers only to light being stored in the excited states of atoms, then re-emitted at an arbitrary later time, as stimulated by a second laser pulse.

However, recent experiments suggest that physical differences among cells, that exist prior to infection, predetermine whether a cell will lyse or become a lysogen.

However, a century later, Young and Fresnel revived the wave theory of light when they pointed out that light could be a transverse wave rather than a longitudinal wave — the polarization of a transverse wave ( like Newton's " sides " of light ) could explain birefringence, and in the wake of a series of experiments on diffraction the particle model of Newton was finally abandoned.

However, Hendrik Antoon Lorentz ( 1895 ) modified Fresnel's theory and showed that those experiments can be explained by a stationary aether as well:

However, such particles are regularly created in experiments, in order to understand the nature of the heavier types of quark which compose the heavier mesons.

However, there has been considerable controversy over this as later researchers have failed to reproduce the original findings of Rauscher ( e. g. Steele, Bass & Crook, 1999 ), questioned both theory and methodology of the original study ( Fudis & Lembesis 2004 ) and suggested that the enhancing effects of music in experiments have been simply due to an increased level of arousal ( Thompson, Schellenberg & Husain, 2001 ).

" However, in nature, L amino acids dominate ; later experiments have confirmed disproportionate amounts of L or D oriented enantiomers are possible.

However, in light of inherent problems with past protocols on acute nitrate toxicity experiments, the extent of nitrate toxicity has been the subject of recent debate.

However Lenard's results were qualitative rather than quantitative because of the difficulty in performing the experiments: the experiments needed to be done on freshly cut metal so that the pure metal was observed, but it oxidised in a matter of minutes even in the partial vacuums he used.

However, in recent decades, for what doubtless are multiple reasons, an unannounced but nonetheless readily observable shift has occurred in both facets of national activity.

However, in the context of legal and civic policy, these controversies are less than novel.

However, despite the insight of many of his observations, his own conclusions are open to suspicion because of his failure to employ at all times the correct research methods.

However, there are still several types of calls that necessitate the use of telephone operators.

However, he states unequivocally `` the scandals in business are far less significant than the scandals in labor ''.

However, few are taxed, and the owners and location of most boats are unknown to the assessors on the date of assessment of town valuations.

However, the surface temperature gradient can produce erroneous vapor-pressure measurements for the bulk liquid helium unless precautions are taken to isolate the tube ( which passes through the surface to the vapor pressure bulb ) from the liquid helium surface.

However, if their United States income is not subject to the withholding of tax on wages, their returns are due June 15, 1962, if they use a calendar year, or the 15th day of the 6th month after the close of their fiscal year.

However, the aircraft which we have today are tied to large, `` soft '' airfields.

However, some formulas are used more than others.

However, there is also much to be gained by making use of the abilities of the local people who are available and interested in recreation.

However, there are photographs of suspended drops of cyclohexanol phthalate ( viscosity 155 poises ) suspended in corn syrup of 71 poises in a paper by Mason and Bartok.

However, any oxygen nonequivalence would shorten either the already extremely short Af interlayer distance of 2.55 A or the non-hydrogen-bonded Af interlayer interactions which are already quite short at 2.58 Aj.

However, as so many of the records are not certainly based on newborn snakes, these data must be taken tentatively ; ;

However, if these procedures are applied more often, conditioned emotional responses are temporarily abolished.

However, it cannot be presumed, informal though the structure of the population seems, that there are not well-defined roles within the system.

However, the differences in procedure are fundamental.

However, the regionally differentiated results, which appear below in tables, are interesting evidence of the problems of developing self-government under even the most favorable circumstances.

However, if Federal funds are used, it would be entirely appropriate to train workers for jobs which could be obtained elsewhere as well as for jobs in the area of chronic unemployment.

However, it is not known to either the union or the public precisely how much of a cost increase is caused by a given change in the basic wage rate, although the companies are presumed to have reliable estimates of this magnitude.

However, there are relatively few such political constituencies, and, as has been pointed out, there is seldom a clear-cut distinction between the educational interests of one social class and those of another.

However, modesty and triviality are different qualities.

`` However, evidence that the Axis powers are making significant preparations indicative of such an intention is being reported with increasing frequency from a variety of sources.