How important is your mobile phone,

How important is your mobile phone, better known to Americans as a cellphone? Many people say they use the device all the time. So far, no studies have proven beyond question that the radio signals from cellphones cause brain cancer or other health problems. But a new study by government scientists in the United States has some people wondering what to think. The scientists found that holding a cellphone to your ear for at least fifty minutes increases brain cell activity. Even the scientists themselves are not sure about the meaning of their findings.Dr. Nora Volkow led the study. She heads the National Institute on Drug Abuse, part of the National Institutes of Health. Dr. Volkow says she would not be concerned that fifty minutes of cellphone exposure would harm anyone. But she says the research does show the need to study whether there are long-lasting effects of repeated exposure over several years.Her team studied forty-seven healthy volunteers in two thousand nine. The volunteers had cellphones placed against both ears while the scientists made images of their brain activity. As part of the test, one phone was activated but muted for fifty minutes. The other phone was off. After that, the people were tested with both phones turned off. Dr. Volkow says the brain scans showed increased activity in brain cells closest to the activated phone.She said the right area of the brain that was very close to the antenna showed the largest increase in metabolism compared to when the telephones were off. Even though the radio frequencies emitted from current cellphones are very weak, they are able to activate the human brain.The scans showed how the brain cells used sugar to produce energy, a normal activity. The activity was seven percent higher in areas of the brain closest to the cellphone antenna. Experts say people who are concerned about mobile phones can take steps like using a wired headset.Dr. Giuseppe Esposito is a nuclear medicine expert at Georgetown University Medical Center in Washington. He says after many years of studies, better kinds of research are still needed to settle questions about cellphone safety. These studies would take years. He said there should be epidemiological studies of a population of high users or light users of cellphones and then see what happens over the years

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Hoe belangrik is jou selfoon, beter bekend Amerikaners as 'n selfoon? Baie mense sê hulle gebruik die toestel al die tyd. Tot dusver het geen studies buite vraag wat die radio seine van selfone die brein veroorsaak kanker of ander gesondheids probleme bewys. Maar 'n nuwe studie deur die regering wetenskaplikes in die Verenigde State van Amerika het 'n paar mense wonder wat om te dink. Die wetenskaplikes het bevind dat die hou van 'n selfoon aan jou oor vir ten minste vyftig minute verhoog die brein sel aktiwiteit. Selfs die wetenskaplikes self nie seker is oor die betekenis van hul findings.Dr. Nora Volkow die studie gelei het. Sy hoof van die Nasionale Instituut op dwelmmisbruik, deel van die National Institutes of Health. Dr Volkow sê sy sou nie bekommerd dat vyftig minute blootstelling selfoon enigiemand sou skade wees. Maar sy sê die navorsing toon wel die behoefte om te studeer of daar langdurige gevolge van herhaalde blootstelling oor 'n paar years.Her span bestudeer sewe en veertig gesonde vrywilligers in 2009. Die vrywilligers het selfone geplaas teen beide ore, terwyl die wetenskaplikes gemaak beelde van hul brein aktiwiteit. As deel van die toets, is 'n selfoon geaktiveer, maar gedemp vyftig minute. Die ander telefoon was af. Daarna is die mense wat getoets met beide selfone afgeskakel. Dr Volkow sê die brein skanderings getoon verhoogde aktiwiteit in die brein selle wat die naaste aan die geaktiveerde phone.She gesê die regte area van die brein wat baie naby aan die antenna was het die grootste toename in die metabolisme in vergelyking met wanneer die telefone was af. Selfs al is die radio frekwensies afkomstig van huidige selfone is baie swak, hulle in staat is om die menslike brain.The skanderings het gewys hoe die breinselle gebruik suiker om energie, 'n normale aktiwiteit produseer aktiveer. Die aktiwiteit was sewe persent hoër in areas van die brein wat die naaste aan die selfoon antenna. Kenners sê mense wat bekommerd is oor selfone kan stappe neem soos die gebruik van 'n bedraad headset.Dr. Giuseppe Esposito is 'n kerngeneeskunde deskundige by Georgetown University Medical Center in Washington. Hy sê ná baie jare van studies, is beter soorte navorsing nog nodig om vrae oor die veiligheid selfoon te vereffen. Hierdie studies sal jare neem. Hy het gesê daar moet wees epidemiologiese studies van 'n bevolking van hoë gebruikers of lig gebruikers van selfone en kyk dan wat gebeur oor die jare.