Bangcoc, 26 out (EFE).- Os rastros humanos deixadas pelos assassinos na cena do crime, como sangue, saliva, linfa, esperma e outros fluidos corporais, poderão ser detectadas com mais facilidade graças a óculos com lentes de nanocristal desenvolvidos por cientistas tailandeses.
Segundo informa hoje a imprensa da Tailândia, os óculos são capazes de filtrar a luz de diferentes comprimentos de onda. Para isso, os cientistas usaram lentes plásticas que receberam nanocristais à base de oxinitreto de índio.
Segundo informa hoje a imprensa da Tailândia, os óculos são capazes de filtrar a luz de diferentes comprimentos de onda. Para isso, os cientistas usaram lentes plásticas que receberam nanocristais à base de oxinitreto de índio.
"É uma técnica muito especial. O nanocristal apresenta características excepcionais para filtrar a luz em comprimentos de onda entre 450 e 630 nanômetros", disse Jiti Jiti Nukaew, diretor do Instituto de Tecnologia Rei Mongkut de Ladkrabang (KMITL).
Em declarações ao jornal "Bangkok Post", ele acrescentou que "toda evidência invisível detectável com estes comprimentos de onda poderá ser vista imediatamente com estes óculos".
Somchai Chalermsoonksant, chefe do Instituto Central de Ciência Legista (CIFS), disse que os novos óculos representam um avanço na técnica legista e na resolução de crimes.
"Até o momento, as equipes legistas utilizam uma fonte de luz que tem uma função similar. Mas é um processo muito longo e difícil, porque cada tipo de fluido exigia um comprimento de onda específico e um cristal apropriado", disse o policial. EFE
http://br.noticias.yahoo.com/s/25102007/40/saude-novos-oculos-legistas-ajudam-detectar-pistas-crimes.html
http://www.bangkokpost.net/News/26Oct2007_news02.php
SCIENCE / INNOVATIVE EYEGLASSES
Forensic detectives get a new look
APINYA WIPATAYOTIN
Invisible traces of bodily fluids left behind at crime scenes can now be easily detected, thanks to nanocrystal eyeglasses developed by a group of Thai scientists.
The eyeglasses will enable forensic teams to clearly see fluids such as blood, saliva, lymph and sperm, which are vital clues in helping the authorities track down crime perpetrators, said Jiti Nukaew, director of King Mongkut's Institute of Technology Ladkrabang's (KMITL) nanotechnology research centre.
To create the special eyeglasses, scientists applied nano crystallised indium oxynitride to glass or plastic lenses to create special lenses capable of filtering varying wavelengths of light.
''This is a very special technique. The nano crystallised indium oxynitride has outstanding characteristics for filtering varying wavelengths of light between 450-630 nanometres (nm). It means that all the invisible evidence that can be detected through those wavelengths can be seen at once through the nanocrystal eyeglasses,'' said Mr Jiti.
At the moment, forensic teams use a special tool called a forensic light source, which has a similar function to the nanocrystal eyeglasses _ to detect different kinds of evidence that cannot be seen with the naked eye.
It is a lengthy procedure since the process must be conducted multiple times with each different wavelength of projected light and glass appropriate for each type of fluid, said Pol Lt-Col Somchai Chalermsoonksant, chief of the Central Institute of Forensic Science's (CIFS) crime scene unit.
For example, blue light with a wavelength of 450 nm is needed to detect blood and sperm, while green light at 520 nm and red light at 630 nm will help detectives see saliva and fingerprints.
''Now we can just wear one pair of Thai-made nanoglasses and do everything in one step,'' said Pol Lt-Col Somchai.
Teerachai Pornsinsirirak, deputy director of the Nanotechnology Centre (Nanotec), the state's reseach arm on nanotechnology, said the special eyeglasses were a byproduct of his agency and the KMITL's joint research into nano-crystal technology.
The Nanotec had applied for the patent for the nanocrystal eyeglasses production process in the United States and was planning to commercialise the products, he said.
But further development of the special eyeglasses would be conducted to make it best serve forensic work, he said.
http://br.noticias.yahoo.com/s/25102007/40/saude-novos-oculos-legistas-ajudam-detectar-pistas-crimes.html
http://www.bangkokpost.net/News/26Oct2007_news02.php
SCIENCE / INNOVATIVE EYEGLASSES
Forensic detectives get a new look
APINYA WIPATAYOTIN
Invisible traces of bodily fluids left behind at crime scenes can now be easily detected, thanks to nanocrystal eyeglasses developed by a group of Thai scientists.
The eyeglasses will enable forensic teams to clearly see fluids such as blood, saliva, lymph and sperm, which are vital clues in helping the authorities track down crime perpetrators, said Jiti Nukaew, director of King Mongkut's Institute of Technology Ladkrabang's (KMITL) nanotechnology research centre.
To create the special eyeglasses, scientists applied nano crystallised indium oxynitride to glass or plastic lenses to create special lenses capable of filtering varying wavelengths of light.
''This is a very special technique. The nano crystallised indium oxynitride has outstanding characteristics for filtering varying wavelengths of light between 450-630 nanometres (nm). It means that all the invisible evidence that can be detected through those wavelengths can be seen at once through the nanocrystal eyeglasses,'' said Mr Jiti.
At the moment, forensic teams use a special tool called a forensic light source, which has a similar function to the nanocrystal eyeglasses _ to detect different kinds of evidence that cannot be seen with the naked eye.
It is a lengthy procedure since the process must be conducted multiple times with each different wavelength of projected light and glass appropriate for each type of fluid, said Pol Lt-Col Somchai Chalermsoonksant, chief of the Central Institute of Forensic Science's (CIFS) crime scene unit.
For example, blue light with a wavelength of 450 nm is needed to detect blood and sperm, while green light at 520 nm and red light at 630 nm will help detectives see saliva and fingerprints.
''Now we can just wear one pair of Thai-made nanoglasses and do everything in one step,'' said Pol Lt-Col Somchai.
Teerachai Pornsinsirirak, deputy director of the Nanotechnology Centre (Nanotec), the state's reseach arm on nanotechnology, said the special eyeglasses were a byproduct of his agency and the KMITL's joint research into nano-crystal technology.
The Nanotec had applied for the patent for the nanocrystal eyeglasses production process in the United States and was planning to commercialise the products, he said.
But further development of the special eyeglasses would be conducted to make it best serve forensic work, he said.
