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How small is the tiniest possible particle of ice? According to new NSF-funded research published in the journal Proceedings of the National Academy of Sciences, the smallest nanodroplet of water in w...
Black holes make for a great space mystery. They're so massive that nothing, not even light, can escape a black hole once it gets close enough. A great mystery for scientists is that there's evidence ...
Materials Scientists Probe Protein’s Role in Speeding Ebola Spread（图）
Materials Scientists Protein’s Role Ebola Spread
2017/9/5
Two Johns Hopkins materials science graduate students and their professors played a key role in a multi-institution research project that pinpointed how a tiny protein seems to make the deadly Ebola v...
Phosphate Vibrations Probe Local Electric Fields and Hydration in Biomolecules
Phosphates Water Phospholipids Spectrophotometry, Infrared Electricity Models, Molecular
2016/5/25
The role of electric fields in important biological processes such as binding and catalysis has been studied almost exclusively by computational methods. Experimental measurements of the local electri...
Site-Specific Conversion of Cysteine Thiols into Thiocyanate Creates an IR Probe for Electric Fields in Proteins
food packaging perfluorinated dietary intake human exposure
2016/5/24
The nitrile stretching mode of the thiocyanate moiety is a nearly ideal probe for measuring the local electric field arising from the organized environment of the interior of a protein. Nitriles were ...
Vibrational Stark Spectroscopy in Proteins:A Probe and Calibration for Electrostatic Fields
affinity partition plasma membrane IGF-I receptor C6 glioma wheat germ agglutinin two-phase partitioning
2016/5/23
We report the first measurement of the vibrational Stark effect in a protein, providing quantitative information on the sensitivity of a vibrational transition to an applied electric field. This can b...
The Use of Large Magnetic Fields to Probe Photoinduced Electron Transfer Reactions:An Example from Photosynthetic Reaction Centers
Large Magnetic Fields Photoinduced Electron Transfer Reactions Photosynthetic Reaction Centers
2016/5/20
We will outline an experimental approach that uses large magnetic fields and simple optical methods, combined with a method of data analysis, that is ideally suited for studying the mechanism of rapid...
Probe of Three-Dimensional Chiral Topological Insulators in an Optical Lattice
Three-Dimensional Chiral Topological Insulators Optical Lattice
2016/1/22
We propose a feasible experimental scheme to realize a three-dimensional chiral topological insulator with cold fermionic atoms in an optical lattice, which is characterized by an integer topological ...
Direct Probe of Topological Order for Cold Atoms.
Direct Probe Topological Order Cold Atoms
2016/1/22
Cold-atom experiments in optical lattices offer a versatile platform to realize various topological quantum phases. A key challenge in those experiments is to unambiguously probe the topological order...
New optogenetic probe enables communication with neural microcircuits
New optogenetic communication neural microcircuits
2015/11/13
The burgeoning field of optogenetics makes it possible for scientists to control brain activity using pulses of light. Now, Brown University researchers have developed an optogenetic device which open...
Ground-based radio observations to probe the ozone content in the meteor region
meteor radar ozone
2015/9/16
Radar studies of the plasma irregularities produced by meteoroid ablation provide a powerful diagnostic probe of the Earth's atmosphere. This role is especially important as an inexpensive route for s...
Performance of electrical spectroscopy using a RESPER probe to measure salinity and water content of concrete and terrestrial soil
Explorative Geophysics Concrete and Terrestrial Soil Non-destructive Testing Methods Electrical Resistivity and Salinity Permittivity and Volumetric Water Content
2015/8/27
This paper discusses the performance of electrical spectroscopy using a RESPER probe to measure the salinity s and volumetric content θW of the water in concrete or terrestrial soil. The RESPER probe ...
Lava Geochemistry as a Probe into Crustal Formation at the East Pacific Rise
Lava Geochemistry Crustal Formation East Pacific Rise
2015/7/14
Basalt lavas comprise the greatest volume of volcanic rocks on Earth, and most of them erupt along the world's mid-ocean ridges (MORs). These MOR basalts (MORBs) are generally thought to be relatively...
Taking advantage of the unprecedented sensitivity of the Large Binocular Telescope in southeastern Arizona, an international team of astronomers has obtained the first results from the LEECH exoplanet...
Assessing accuracy of gas-driven permeability measurements: a comparative study of diverse Hassler-cell and probe permeameter devices
gas-driven permeability measurements diverse Hassler-cell probe permeameter devices
2015/1/6
Permeability is one of the most important petrophysical parameters to describe the reservoir properties of sedimentary rocks, pertaining to problems in hydrology, geothermics, and hydrocarbon reservoi...