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However, electron microscopes are expensive instruments that are costly to maintain.
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However and electron
However, although these enzymes can produce oxidants, the relative importance of the electron transfer chain to other processes that generate peroxide is unclear.
However, despite the success of Drude's free electron model, it had one notable problem, in that it was unable to correctly explain the electronic contribution to the specific heat of metals, as well as the temperature dependence of resistivity at low temperatures.
However, metal electrode surfaces can cause a region of the vacuum to become conductive by injecting free electrons or ions through either field electron emission or thermionic emission.
However, to the best of our knowledge, the electron's magnetic moment is not due to a current loop, but is instead an intrinsic property of the electron.
However, when the absorbed electromagnetic radiation is intense, it is possible for one electron to absorb two photons ; this two-photon absorption can lead to emission of radiation having a shorter wavelength than the absorbed radiation.
However in materials with a filled electron shell, the total dipole moment of the electrons is zero because the spins are in up / down pairs.
However, since the nucleus is much heavier than the electron, the values are nearly the same.
However in the case of the free electron laser, atomic energy levels are not involved ; it appears that the operation of this rather exotic device can be explained without reference to quantum mechanics.
However, sometimes — either spontaneously, or owing to an applied external magnetic field — each of the electron magnetic moments will be, on average, lined up.
However, like antiferromagnets, neighboring pairs of electron spins like to point in opposite directions.
However, as Feynman points out, it fails totally to explain why particles such as the electron have the masses they do.
However, tunneling does require that there is an empty level of the same energy as the electron for the electron to tunnel into on the other side of the barrier.
However very thin layers ( below, say, ) become partially conductive because of electron tunneling.
However, usually the Fermi energy is referenced to energy zero: that of the lowest energy electron
However, the mass of the tau ( discovered in the mid 1970s ) () is nearly twice that of the proton, and about 3, 500 times that of the electron.
However, after approximately element 120, the proximity of the electron shells makes placement in a simple table problematic.
However, in order for an electron to jump from a valence band to a conduction band, it requires a specific minimum amount of energy for the transition.
However, when forming a bulk metal, Li atoms come to a resonance structure by taking 1 electron from its neighbouring Li atom and the resultant electronic configuration becomes 1s < sup > 2 </ sup > 2s < sup > 1 </ sup > 2p < sup > 1 </ sup > ( e < sup >-</ sup >).
However, Orliac ( 2005 ) examined seven objects ( tablets B, C, G, H, K, Q, and reimiro L ) with stereo optical and scanning electron microscopes and determined that all were instead made from Pacific rosewood ( Thespesia populnea ); the same identification had been made for tablet M in 1934.
However, ELISA testing, related serological tests, and direct electron microscope observation of viruses are more modern methods for detection.
However, calculations are generally quite lengthy ( even for simple cases as for the radiation emitted by an electron in a bending magnet, they require Airy function or the modified Bessel functions ).
However, the unit of energy electronvolt reminds us that the elementary charge was once called electron.
However, pion production events drain 20 % of the energy of a cosmic ray proton as compared with only 0. 1 % of its energy for electron positron pair production.
However and microscopes
However, in lenses, dispersion causes chromatic aberration, an undesired effect that may degrade images in microscopes, telescopes and photographic objectives.
However, STEM is distinguished from conventional transmission electron microscopes ( CTEM ) by focusing the electron beam into a narrow spot which is scanned over the sample in a raster.
However, in order to delay as long as possible the vast expense and difficulty of adopting a whole new type of illumination technology, manufacturers have turned to a technique, previously used in microscopes, for increasing the numerical aperture of the lens by allowing the light to pass through water instead of air.
However, from a philosophical perspective where all or most of the observable " low hanging fruit " has already been plucked, examining the phenomenological world more closely than the senses alone ( even augmented senses, e. g. via microscopes, telescopes, bifocals etc.
However and are
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.
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