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Growth and characterization of Cu2ZnSn(S,Se)4 thin films for solar cells

Cu2ZnSnS4 (CZTS) and Cu2ZnSnSe4 (CZTSe) with their band gap energies around 1.45 eV and 1.0 eV, respectively, can be used as the absorber layer in thin film solar cells. By using a mixture of both compounds, Cu2ZnSn(S,Se)4 (CZTSSe), a band gap tuning may be possible. The latter material has already shown promising results such as solar cell efficiencies up to 10.1%. In this work, CZTSSe thin films were grown in...

Building a reference DNA barcode library for marine amphipods of Portugal

From DNA barcodes to monitoring of amphipod communities : status and relevance ...

Detection of caliciviruses associated with acute infantile gastroenteritis in S...

Acute gastroenteritis caused by viruses is one of the leading causes of infantile morbidity. The aim of the present study was to investigate the presence of human caliciviruses of the genera norovirus and sapovirus in children up to 3 years of age with acute gastroenteritis from low-income communities in the city of Salvador, Brazil. This study is an extension of previous work carried out to establish the profi...

Distribuição do metal mercúrio em atum (Thunnus albacares) e pescada bicuda (Cy...

O presente estudo verificou a cinética mercurial em órgãos, tecido muscular e conteúdo estomacal de duas espécies de peixes marinhos predadores, identificando os locais de maior acumulação desse metal. Para o processo analítico, foi utilizada a técnica de espectrofotometria de absorção atômica por arraste de vapor a frio. A distribuição de Hg nas porções analisadas apresenta ampla dispersão. Para o atum, a vari...

Magnetic field effects of double-walled carbon nanotubes

A theoretical discussion of electronic and transport properties of a particular family of double-wall carbon nanotubes, named commensurate structures of the armchair type (n,n)@(2n,2n) is addressed. A single pi-band tight binding hamiltonian is considered and the magnetic field is theoretically described by following the Peierls approximation into the hopping energies. Our emphasis is put on investigating the m...

Electronic transport through a single-wall carbon nanotube with a magnetic impu...

We are interested in studying the transport properties of metallic single-wall carbon nanotubes (SWCNTs) with isolated magnetic impurities. We consider a metallic zigzag SWCNT in the form of an infinitely long cylinder of diameter D, connected by two metallic electrodes under a bias voltage $E$, with a magnetic impurity located on its surface. To describe the Kondo resonance we employ an impurity version of the...

Reverse transcription-polymerase chain reaction assay for rabies virus detection

Este estudo teve por objetivo implantar um protocolo de amplificação genômica, precedida de transcrição reversa (RT-PCR) para o gene da nucleoproteína do vírus da raiva, para a utilização dessa metodologia em laboratórios onde são realizadas investigações para a detecção do vírus rábico. Foram utilizadas 50 amostras de tecido encefálico de animais (44 bovinos, 5 eqüinos e 1 quiróptero) oriundos do Estado do Rio...

Atividade antiinflamatória do granulado de Calendula officinalis L. e Matricari...

Este trabalho descreve os resultados da atividade antiinflamatória de um granulado composto pelos extratos secos de Calendula officinalis L. e Matricaria recutita L. (GECOMR® - granulado encapsulado de Calendula officinalis e Matricaria recutita). Estas espécies são utilizadas na medicina popular devido às suas atividades antiinflamatória, antiúlcera gástrica e antiespasmódica. A redução do processo edematogêni...

Human group C rotavirus in children with diarrhea in the Federal District, Brazil

Group C rotaviruses are fastidious in their in vitro cell culture requirements. Recent serosurveys indicate that antibody to group C rotavirus is present in 3-45% of the human population in certain geographic locations, suggesting that rotavirus group C infection is more prevalent than previously believed and that the low rate of detection of these agents is probably due to the lack of sensitive diagnostic assa...