Avanzamos....

AUSTIN, Texas, Aug. 19, 2008 -- A new grant will allow a researcher to continue developing and testing a device that uses light to detect skin cancer without the need for an invasive biopsy. University of Texas at Austin biomedical engineer James Tunnell has been awarded a $260,000 Phase II Early Career Award from the Wallace H. Coulter Foundation. The grant will support his work for the next two years to refine the device called a "clinical spectrometer" and to conduct additional clinical trials. He previously received one of 23 Phase I awards from the foundation, and was one of seven Phase II awards selected from that pool to continue his research. Using a pen-sized probe, weak pulses of light are emitted from the tip onto the skin or tissue and then recaptured by the probe and sent back to a computer system for analysis.

"Within a second, it can take a measurement and tell you whether or not its cancer," said Tunnell, an assistant professor at the university. "And you can move the probe around quickly to different spots of the skin." The light measures the cellular and molecular signatures of skin cancer without the need for a biopsy or the excision of a tissue sample. "It can tell if the structures of the cells and the biochemicals present are associated with the progression of these cancers," Tunnell said. "Many biopsies and surgeries would be unnecessary if you had a device that could catch the cancer earlier and identify the margins of where it exists."

Throughout the world, melanoma, the most serious form of skin cancer, has been increasing over the past 20 years, accounting for 3 percent of cancer deaths. In the United States, more than one million new cases occur annually, according to the National Cancer Institute (NCI). Survival rates increase substantially when the disease is diagnosed at an early stage. So far, the device has been tested on 80 people in clinical trials at M.D. Anderson Cancer Center in Houston and with The University of Texas Medical Branch clinicians in Austin. A total of 300 people will be screened at those institutions using the device. "The early results look very promising," Tunnell said.

Blog Hermano

Cordialmente invitados a visitar el siguiente Blog:

http://mesacqb.blogspot.com/

SPR

I was reading about the Surface Plasmon Resonance, which is one of the optical phenomena of the plasmonic coupling of metal nanoparticles with light, and I thought it would be quite interesting to post some information about it.

Resonant light scattering (RLS), surface-enhanced Raman scattering (SERS) and SPR have tremendous potential for ultrasensitive chemical and biomolecular detection and analysis. Especially, the surface plasmon resonance is important because of it helps to the evaluation of macromolecules, kinetic measurements, analysis of mutant proteins and equilibrium measurements (affinity and enthalpy). We can easily define the SPR as the oscillation of the free electrons at the surface, when treated with a certain frequency (quasi electrons).

Well... I would really like to continue discussing this theme, but I have to go now. I leave more information about.

Asr be kheir

Surface plasmon resonance (SPR) is a phenomenon occuring at metal surfaces (typically gold and silver) when an incident light beam strikes the surface at a particular angle. Depending on the thickness of a molecular layer at the metal surface, the SPR phenomenon results in a graded reduction in intensity of the reflected light. Biomedical applications take advantage
of the exquisite sensitivity of SPR to the refractive index of the medium next to the metal surface, which makes it possible to measure accurately the adsorption of molecules on the metal surface and their eventual interactions with specific ligands.

The last ten years have seen a tremendous development of SPR use in biomedical applications. The technique is applied not only to the measurement in real-time of the kinetics of ligand–receptor interactions and to the screening of lead compounds in
the pharmaceutical industry, but also to the measurement of DNA hybridization, enzyme–substrate interactions, in polyclonal antibody characterization, epitope mapping, protein conformation studies and label-free immunoassays.

Reference::::::

Surface plasmon resonance: principles, methods and applications in biomedical sciences
Patrick Englebienne
Anne Van Hoonacker and Michel Verhas
Free University of Brussels, Department of Nuclear Medicine, Brugmann University Hospital,
Brussels, Belgium

Images::::::

Institut De Physique et Chimie des Materiaux de Strasbourg: JALABERT Rodolfo et WEINMANN Dietmar

Immobilization of Gold Nanoparticles on Silanized Substrate for Sensors Based on Localized Surface Plasmon Resonance(Regular Paper)(March 1, 2007)Shuji Taue, Koji Nishida, Hiroyuki Sakaue, and Takayuki Takahagi.

Un peu de français

Il y a beaucoup de temps qu'il voulait partager ce poème. À mon avis il n'est pas très difficile et il m'a aidée à pratiquer mon français. J'espère qu'il est de son plaisir, comme lui il a été pour moi. L'automne est une de mes gares favorites, comme le décrit ce poème. Salutations.

Automne

A Jules Dupré.

La rivière s'écoule avec lenteur. Ses eaux

Murmurent, près du bord, aux souches des vieux aulnes

Qui se teignent de sang ; de hauts peupliers jaunes

Sèment leurs feuilles d'or parmi les blonds roseaux.

Le vent léger, qui croise en mobiles réseaux

Ses rides d'argent clair, laisse de sombres zones

Où les arbres, plongeant leurs dômes et leurs cônes,

Tremblent, comme agités par des milliers d'oiseaux.

Par instants se répète un cri grêle de grive,

Et, lancé brusquement des herbes de la rive,

Etincelle un joyau dans l'air limpide et bleu;

Un chant aigu prolonge une note stridente;

C'est le martin-pêcheur qui fuit d'une aile ardente

Dans un furtif rayon d'émeraude et de feu.

Courrières, 1875

alternative energy sources

One of the biggest interests in research right now is to find alternative energy sources to help overcome the current energy crisis we are facing. One important research topic is to find a way to purify water at a lower price and using less energy; this will help people in both industrialized and developing countries considerably. Eric Hoek and his research team at the University of California at Los Angeles created a membrane of nanoparticles that aims to reduce the cost needed to desalinate seawater and clean wastewater. This groundbreaking technology may be adapted in municipal desalination plants in water-thirsty areas. In an effort to bring about new energy sources, a newsletter, NanoFronties, discusses the international nanotechnology research and development news. It explores the question of whether developing nations will share the benefits of nanotechnology with other countries. The examples include nanotechnology advances in therapeutic and preventive treatments for HIV/AIDS, "fog harvesting" in Thailand, China and Nepal and improved desalination technology to turn seawater into drinking water.

The publication of these investigations was led by Visions for the Future of Nanotechnology and written by Karen F. Schmidt

To listen the podcasts available online, click here.

hoy

No sé escribir

No sé expresar

No quiero arruinar

No pienso aguantar

No te temo

No te olvido

No te dejo

No después

No mañana

Sí te creo

Sí te quiero

Sí ahora

Sí eterno

Sí feliz

Sí conozco

Sí te escribo

Sí te expreso

SÍ TE AMO

Jesús, perfecto amor

Él es la imagen del Dios invisible, el primogénito
de toda creación,porque por medio de él fueron
creadas todas las cosas en el cielo y en la tierra,
visibles e invisibles, sean tronos, poderes, principados o autoridades:
todo ha sido creado por medio de él y para él. Él es anterior a todas las cosas, que por
medio de él forman un todo coherente. Él es
la cabeza del cuerpo, que es la iglesia. Él es el principio, el primogénito de la resurrección,
para ser en todo el primero.

(nvi)
Colosenses 1:15-18