Researchers at the University of Pennsylvania have created the first three-dimensional optical images of human breast cancer in patients based on tissue fluorescence.

Fluorescence diffuse optical tomography, or FDOT, relies on the presence of fluorophore molecules in tissue that re-radiate fluorescent light after illumination by excitation light of a different color.

The reconstructed images demonstrated significant tumor contrast compared to typical endogenous optical contrast in breast. Tumor-to-normal tissue contrast based on FDOT with the fluorophore Indocyanine Green, or ICG, was two-to-four-fold higher than contrast based on endogenous contrasts such as hemoglobin and scattering parameters obtained with traditional diffuse optical tomography, or DOT.

Ultrafast intramolecular electronic charge separation during photo-chemical reactions cause up to tenthousand surrounding molecules to perform aligning pirouettes. Researchers observed for the first time such light induced reorientations in an organic molecular crystal.

In their study they initiated a separation of positive and negative electronic charge in a small number of particular molecules with extremely short light pulses. In turn the surrounding molecules responded by aligning their respective dipole axes along the photoinduced electric fields. The researchers observed this fundamental process for the first time by means of femtosecond x-ray diffraction with high spatial precision and in real time.

Physicists of the DZero experiment at the Department of Energy's Fermi National Accelerator Laboratory have discovered a new heavy particle, the Î_b(pronounced "zigh sub b") baryon, with a mass of 5.774±0.019 GeV/c², approximately six times the proton mass.

The newly discovered electrically charged Î_b baryon, also known as the "cascade b," is made of a down, a strange and a bottom quark. It is the first observed baryon formed of quarks from all three families of matter.

A protein found primarily in the lens of the eye could be the critical "tipping point" in the spiral of inflammation and damage that occurs in multiple sclerosis, researchers at the Stanford University School of Medicine report.

This protein - alphaB-crystallin - is not normally found in the brain, but develops in response to the injuries inflicted on nerve cells by multiple sclerosis. The nerve-cell injuries can cause people to suffer loss of motor control and even paralysis.

A major study of the organization and regulation of the human genome published today changes our concept of how our genome works. The integrated study is an exhaustive analysis of 1% of the genome that, for the first time, gives an extensive view of genetic activity alongside the cellular machinery that allows DNA to be read and replicated.

The lead report from the ENCyclopedia Of DNA Elements (ENCODE) Consortium, published in Nature, together with 28 companion papers published in Genome Research, defined in detail which regions of the genome are actively copied in the cell, revealed the location and studied evolution of elements that control gene activity, and defined the relationship between DNA-associated proteins and gene activity and DNA replication.

A method for increasing plants’ tolerance to salt stress and thus preventing stunted growth and even plant death has been developed. The method has significant consequences for dealing with soil salinization, which is an acute problem for a wide range of crops in many regions of the world.