Cientista tailandês cria enzimas que reciclam papel laminado

Combinação de proteínas recupera polpa de material usado em caixa de cigarro e etiquetas.

Acesse o link e confira!!!!

http://noticias.r7.com/tecnologia-e-ciencia/noticias/cientista-tailandes-cria-enzimas-que-reciclam-papel-laminado-20101207.html

Susceptible and protective eNOS haplotypes in hypertensive black and white subjects

Atherosclerosis. 2006; 186(2):428-32

Sandrim VC, Coelho EB, Nobre F, Arado GM, Lanchote VL, Tanus-Santos JE.

Polymorphisms in the endothelial nitric oxide synthase (eNOS) gene have been inconsistently associated with hypertension. This inconsistency may derive from population stratification secondary to ethnic diversity, and consideration limited to only one rather than combinations of polymorphisms. We studied three genetic variations in the eNOS gene: a single nucleotide polymorphism in the promoter region (T-786C), in exon 7 (Glu298Asp), and a variable number of tandem repeats in intron 4 (b/a) of the eNOS gene in hypertensives (112 whites and 91 blacks) and normotensives (113 whites and 87 blacks). In addition, we also examined the

Consistent interethnic differences in the distribution of clinically relevant endothelial nitric oxide synthase genetic polymorphisms

Nitric Oxide. 2005; 12(3):177-82

Marroni AS, Metzger IF, Souza-Costa DC, Nagassaki S, Sandrim VC, Correa RX, Rios-Santos F, Tanus-Santos JE.

A maldistribution of endothelial nitric oxide synthase (eNOS) genetic variants may explain differences in NO-mediated effects and response to drugs among black and white subjects. While interethnic differences in the distribution of eNOS genetic variants exist in the American population, it is not known whether such interethnic differences exist in other populations. To test this possibility, we examined the distribution of genetic variants of three clinically relevant eNOS polymorphisms (T(-786)C in the promoter, the VNTR in intron 4, and the Glu298Asp variant in exon 7) in 136 black and 154 white subjects from a Brazilian

Influence of temperature on the properties of the xylanolytic enzymes of the thermotolerant fungus Aspergillus phoenicis.

J Ind Microbiol Biotechnol. 2004 Feb;31(2):88-93

Rizzatti AC, Sandrim VC, Jorge JA, Terenzi HF, Polizeli MLTM

This study reports on the effects of growth temperature on the secretion and some properties of the xylanase and beta-xylosidase activities produced by a thermotolerant Aspergillus phoenicis. Marked differences were observed when the organism was grown on xylan-supplemented medium at 25 degrees C or 42 degrees C. Production of xylanolytic enzymes reached maximum levels after 72 h of growth at 42 degrees C; and levels were three- to five-fold higher than at 25 degrees C. Secretion of xylanase and beta-xylosidase was also  strongly stimulated at the higher temperature. The optimal temperature was 85 degrees C for extracellular and 90 degrees C for intracellular beta-xylosidase activity, independent of the growth temperature. The optimum temperature for extracellular xylanase increased from 50 degrees C to 55 degrees C when the fungus was cultivated at 42 degrees C. At the higher temperature, the xylanolytic enzymes produced by A. phoenicis showed increased thermostability, with changes in the profiles of pH optima. The chromatographic profiles were distinct when samples obtained from cultures grown at different temperatures were eluted from DEAE-cellulose and Biogel P-60 columns.

Transcrição

TRANSCRIÇÃO: é o processo de formação do RNA mensageiro(RNAm)  utilizando-se como molde a molécula de DNA. A molécula de RMAm tem como função "informar" ao RNA transportador (RNAt) a ordem correta dos aminoácidos a serem sintetizados e ligados formando as proteínas necessárias ao metabolismo celular.


Assunto super interessante e muito bem ilustrado pelo vídeo a seguir. Click no link abaixo.

http://www.youtube.com/watch?v=nNjbYfhfgIo

Video com autoria de terceiros.

Production and properties of xylanases from Aspergillus terricola Marchal and Aspergillus ochraceus and their use in cellulose pulp bleaching

M. Michelin • S. C. Peixoto-Nogueira • J. H. A. Betini • T. M. da Silva • J. A. Jorge • H. F. Terenzi • M. L. T. M. Polizeli

Bioprocess Biosyst Eng (2010) 33:813–821

Aspergillus terricola and Aspergillus ochraceus, isolated from Brazilian soil, were cultivated in Vogel and Adams media supplemented with 20 different carbon sources, at 30ºC, under static conditions, for 120 and 144 h, respectively. High levels of cellulase-free xylanase were produced in birchwood or oat spelt xylan-media. Wheat bran was the most favorable agricultural residue for xylanase production. Maximum activity  was obtained at 60ºC and pH 6.5 for A. terricola, and 65ºC and pH 5.0 for A. ochraceus. A. terricola

Cadeia respiratória e síntese de ATP

Assuntinho difícil que pode ser divertido! Click no link abaixo:

http://www.youtube.com/watch?v=ywH_lgRZtZQ

Autoria de terceiros