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, electron microscopes are expensive instruments that are costly to maintain.

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, bus still tends to be more common than rail as a mode of inter-city transport.

However, Army units in the United States would have had trouble fielding mechanized and logistical assets, while the US Navy could not supply sufficient amphibious shipping to transport even a modest armored contingent from the Army.

However, if a service ( e. g. public transport ) operates from for example, 6: 00 to 1: 00 the next day ( which may be noted as 25: 00 ), the last hour may well count as being part of the previous day ( also for the arrangement of the timetable ).

However, although it is clear that lipid transport is a central process in organelle biogenesis, the mechanisms by which lipids are transported through cells remain poorly understood.

However trucks are now used to transport the bauxite ore.

However it never achieved the commercial success its sponsors had hoped for and signalled canals as an dying mode of transport in an age dominated by railways, which were quicker and often cheaper.

However, during this period there was little investment in public transport and the motor car increased in popularity.

However, bulk freight still continues to be transported by coastal shipping and by rail transport, and there are attempts to ( re ) introduce public transport as a major transport mode in the larger population centres.

However, the whole import cycle needs the hydrolysis of 2 GTPs and is thus energy dependent and has to be considered as active transport.

However, marionette productions presented in empty halls, the back rooms of taverns, or within large tents at England's yearly agricultural events at Bartholomew Fair and Mayfair were expensive and cumbersome to mount and transport.

However, the crusading army melted away at Ancona for want of transport, and when at last the Venetian fleet arrived, the dying Pope could only view it from a window.

However, as environmental technologies were to make up a potential market, some countries made large investments in renewable energies, energy conservation and sustainable transport.

However, apart from sea transport, mosquitoes have been effectively carried by personal vehicles, delivery trucks, trains and aircraft.

However, most boil down to two simple components: local loop ( the cost the local incumbent charges to transport the signal from the end user's central office, otherwise known as a CO, to the point of presence, otherwise known as a POP, of the carrier ) and the port ( the cost to access the telephone network or the Internet through the carrier's network ).

However, assuming the surface to winds are uniform, a faster overall velocity will work to transport moisture quicker from the water, and the band will travel much further inland.

However, the lobsters are so delicate that even transport to Boston almost kills them, making the market for new-shell lobsters strictly local to the fishing towns where they are offloaded.

However, without dedicated transport vessels, the cohesion-tension mechanism cannot transport water more than about 2 cm, severely limiting the size of the earliest plants.

However, for most goods the increased fuel costs and decreased transport efficiencies are more than offset by the savings in handling costs.

However, until the advent of low-cost carriers, point-to-point air transport declined in favor of a more pronounced hub-and-spoke system.

However, there is significant progress still to be made to ensure uniform access to all available transport.

However, this majority of pedestrians are consistently ignored in the planning of transport.

However, the combination of elements recalls an infamous episode from Frobisher's 1576 voyage to Baffin Island and the tragic fate of an unnamed Inuit paddler who was lured aboard the explorer's ship, Gabriel, and kidnapped for transport back to England as proof of the expedition's success in reaching the New World.