However, a special UVB bulb must be used in order for them to absorb the calcium from the gut.

However, the use of Vitamin D supplements provides a more reliable, cheaper and clearly safer way to obtain needed Vitamin D. High pressure tanning beds, which emit primarily UVA radiation provide minimal vitamin D production which require skin exposure to UVB radiation.

However, some alloys can also have their properties altered by heat treatment.

However, since it is capable of being greatly altered and even discharged by heat, the color was believed by some authorities to be from an organic source.

However, before reaching the transition temperature, the specific heat of the superconductor becomes even higher than that of the normal conductor ( measured immediately above the transition ) and the ratio of these two values is found to be universally given by 2. 5.

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, under conditions of constant pressure, as in reactions in vessels open to the atmosphere, the measured heat change is not always equal to the internal energy change, because pressure-volume work also releases or absorbs energy.

However, both numbers would be a fraction of the heat generated by many high performance processors, some years later.

However, the word " heat " is a highly technical term in physics and thermodynamics, and is often confused with thermal energy.

However, he maintained that a certain ' materia pinguis ' or ' fatty matter ,' set into fermentation by heat, gave birth to fossil organic shapes, as opposed to fossil shells having belonged to living animals.

However, the glass transition may be described as analogous to a second-order phase transition where the intensive thermodynamic variables such as the thermal expansivity and heat capacity are discontinuous.

However, Rhett kisses her passionately, and in the heat of the moment she agrees to marry him.

However, endothermic homeotherms ( the animals generally characterized as " warm-blooded ") both produce more heat and have better ways to retain and regulate it than other animals.

However, liquid lubricants are much more effective on account of their high specific heat capacity.

However, because they emit little heat, ice and snow may build up on the LED luminaire in colder climates.

However, the carcinogens are destroyed by moderate heat when cooking.

However, in nuclear reactors, the fission fragment kinetic energy remains as low-temperature heat, which itself causes little or no ionization.

However, the reactor complex was destroyed by the heat, as well as by ordinary burning of the graphite exposed to air.

However, most of the heat generated when a meteor enters the Earth's atmosphere is carried away by ablation and the interiors of freshly landed meteorites are rarely heated much and are often cold.

However in the presence of an external magnetic field there is latent heat, because the superconducting phase has a lower entropy below the critical temperature than the normal phase.

However, as a class of adhesives, traditional cyanoacrylates are classified as having " weak " resistance to both moisture and heat although the inclusion of phthalic anhydride reportedly counteracts both of these characteristics.

However, any leakage flux that intercepts nearby conductive materials such as the transformer's support structure will give rise to eddy currents and be converted to heat.

However, the heat removal problem is central to all electrical apparatus such that in the case of high value transfomer assets, this often translates in a need to monitor, model, forecast and manage oil and winding conductor insulation temperature conditions under varying, possibly difficult, power loading conditions.

However, ultrasonic energy has two potential physiological effects: it enhances inflammatory response ; and it can heat soft tissue.

However, friction emerges when considering more complex structures of matter, whose surfaces can convert mechanical energy into heat energy when rubbed against each other.

However, the intense pulse of high-energy neutrons that is generated is intended as the principal killing mechanism, not the fallout, heat or blast.

However, practical engineering constraints apply for such as the power to mass ratio, waste heat dissipation, and the energy intake able to be supplied and handled.

However, the uneven spectrum of traditional fluorescent lamps may cause certain colors to appear different than when illuminated by incandescent light or daylight.

However, the lamps proved a false dawn because they became unsafe very quickly and provided a weak light.

However, the Edison alkaline battery proved useful for lighting railway cars and signals, maritime buoys, and miners lamps.

However, from 2007 onwards, the halogen lamps were replaced with LED lights.

However, some lamps ( mainly fluorescent tubes / energy saving lamps ) can be restruck as soon as they are turned off ( called hot restrike lamps ).

However, when ramp metering is about to be enabled, the overhead lamps may show flashing or solid yellow to warn drivers to prepare to stop.

However, in October, a proposal was written to turn them all into electric lamps, but the proposal was denied.

However, another oil-lamp of the same kind, showing the sixty-nine almost identically … is more recently reproduced as a full-color plate, in Prof. Jean Marcadé ’ s Eros Kalos ( English-language edition, Geneva: Nagel, 1965 ), facing page 58, in … lamps preserved in the Heracleion Museum in Greece.

However, CCFLs are strictly limited in the degree to which they can be dimmed, both because a lower plasma current will lower the temperature of the cathode, causing erratic operation, and because running the cathode at too low a temperature drastically shortens the life of the lamps.

However, funding for the move was not available, and in 1980 San Jose began a program to reduce the effects of lighting, most notably replacing all streetlamps with low pressure sodium lamps.

However also LEDs, SLEDs or lamps play an important role.

However, these lamps suffer from higher purchase cost, shorter life, and lower light efficiency.

However, the modification must be done professionally as the high voltages that power these lamps can be lethal.

However, when scotopic / photopic light calculations are used, it can be seen how inappropriate HPS lamps are for night lighting.

However, the high cost of natural gas lighting at least partly explains why a large number of older gas lamps have been converted to electricity.

However, mercury vapor lamps are falling out of favor and being replaced by sodium vapor and metal halide lamps.

However, it is more important to determine the type of lamps and fittings needed to create the desired effects.

However, high-frequency operation does not increase lamp efficacy as for fluorescent lamps.

However, as both the incandescent lamps and the orange signage were replaced with the more conventional fluorescent white tubes, these red tones disappeared.

However, it has been under the aegis of Liberal ( later Liberal Democrat ) Sir Alan Beith since 1973, and previously the area has been notable for its liberal leanings – both Sir William Beveridge ( influential in the formation of the National Health Service ) and Edward Grey ( Foreign Secretary at the start of World War I, best remembered for the " lamps are going out all over Europe ...." remark ) have served this constituency.

However, a shorter phototherapy recovery period was noticed in babies exposed to the green lamps ( 1 ).