Results 31 to 40 of about 70,225 (338)

On the quantum and classical scattering times due to charged dislocations in an impure electron gas

, 2002
We derive the ratio of transport and single particle relaxation times in three and two - dimensional electron gases due to scattering from charged dislocations in semiconductors. The results are compared to the respective relaxation times due to randomly
A. Gold, A. Saxler, A.F. Brana, B. Pödör, D. Jena, D. Jena, D.C. Look, Debdeep Jena, E. Frayssinet, J.P. Ibbetson, L. Hsu, O. Ambacher, S. Das Sarma, S. Elhamri, S. Elhamri, Umesh K. Mishra, Z.W. Zheng   +16 more
core   +1 more source

A methionine‐lined active site governs carbocation stabilization and product specificity in a bacterial terpene synthase

FEBS Letters, EarlyView.
This study reveals a unique active site enriched in methionine residues and demonstrates that these residues play a critical role by stabilizing carbocation intermediates through novel sulfur–cation interactions. Structure‐guided mutagenesis further revealed variants with significantly altered product profiles, enhancing pseudopterosin formation. These
Marion Ringel, Carl P. O. Helmer, Shani Zev, Ronja Driller, Emily Buhr, Markus Reinbold, Renana Schwartz, Gabriel Foley, Mikael Boden, Daniel Garbe, Gerhard Schenk, Dan Thomas Major, Bernhard Loll, Thomas Brück   +13 more
wiley   +1 more source

Fast Dynamos in Weakly Ionized Gases [PDF]

The Astrophysical Journal, 2008
The turnover of interstellar gas on ∼ 109 yr timescales argues for the continuous operation of a galactic dynamo. The conductivity of interstellar gas is so high that the dynamo must be "fast"; i.e., the magnetic field must be amplified at a rate nearly independent of the magnetic diffusivity.
Zweibel, E.G., Heitsch, F.
openaire   +1 more source

Highly Ionized High Velocity Clouds: Intergalactic Gas in the Local Group or Distant Gas in the Galactic Halo? [PDF]

, 1998
We have recently identified several high velocity (V < -100 km/s) clouds in the directions of Mrk 509 and PKS 2155-304 that have unusual ionization properties.
Bergeron J., Blair D. Savage, Bland-Hawthorn J., Bomans D. J., Cohen R. J., de Boer K. S., Edward M. Murphy, Kenneth R. Sembach, Limin Lu, Mirabel I. F., Moore B., Oort J. H., Petitjean P., Songaila A., Wakker B. P., Walborn N. R.   +15 more
core   +2 more sources

Peroxidasin enables melanoma immune escape by inhibiting natural killer cell cytotoxicity

Molecular Oncology, EarlyView.
Peroxidasin (PXDN) is secreted by melanoma cells and binds the NK cell receptor NKG2D, thereby suppressing NK cell activation and cytotoxicity. PXDN depletion restores NKG2D signaling and enables effective NK cell–mediated melanoma killing. These findings identify PXDN as a previously unrecognized immune evasion factor and a potential target to improve
Hsu‐Min Sung, David Bickel, Lena C. M. Krause, Daria Ezeriņa, Christian Ickes, Julian Wojtachnia, Christine S. Gibhardt, Magdalena Shumanska, Khadija Wahni, Andrea Paluschkiwitz, Julia Malo Pueyo, Ekaterina Baranova, Wim Vranken, Hedwig Stanisz, Ioana Stejerean‐Todoran, Michael P. Schön, Joris Messens, Ivan Bogeski   +17 more
wiley   +1 more source

Extracellular Heat Shock Protein 27 Is Released by Plasma-Treated Ovarian Cancer Cells and Affects THP-1 Monocyte Activity

Plasma, 2022
Heat shock protein 27 (Hsp27) is a cytoprotective molecule and is inducible via oxidative stress. Anti-cancer therapies, such as the recently investigated gas plasma, subject tumor cells to a plethora of reactive oxygen species (ROS).
Debora Singer, Can Pascal Wulff, Matthias B. Stope, Sander Bekeschus   +3 more
doaj   +1 more source

Tumour–host interactions in Drosophila: mechanisms in the tumour micro‐ and macroenvironment

Molecular Oncology, EarlyView.
This review examines how tumour–host crosstalk takes place at multiple levels of biological organisation, from local cell competition and immune crosstalk to organism‐wide metabolic and physiological collapse. Here, we integrate findings from Drosophila melanogaster studies that reveal conserved mechanisms through which tumours hijack host systems to ...
José Teles‐Reis, Tor Erik Rusten
wiley   +1 more source

Penning ionization of doped helium nanodroplets following EUV excitation

, 2013
Helium nanodroplets are widely used as a cold, weakly interacting matrix for spectroscopy of embedded species. In this work we excite or ionize doped He droplets using synchrotron radiation and study the effect onto the dopant atoms depending on their ...
Brauer, N. B., Buchta, D., Callegari, C., Coreno, M., Devetta, M., DiFraia, M., Drabbels, M., Krishnan, S. R., Moshammer, R., Mudrich, M., O'Keeffe, P., Prince, K., Richter, R., Stienkemeier, F.   +13 more
core   +1 more source

Spectral self-action of THz emission from ionizing two-color laser pulses in gases [PDF]

, 2014
The spectrum of terahertz (THz) emission in gases via ionizing two-color femtosecond pulses is analyzed by means of a semi-analytic model and finite-difference-time-domain simulations in 1D and 2D geometries.
Babushkin, Ihar, Bergé, Luc, Cabrera-Granado, Eduardo, Chen, Yxing, Skupin, Stefan   +4 more
core   +7 more sources

Systemic dysregulation of apolipoproteins in amyotrophic lateral sclerosis serum

FEBS Open Bio, EarlyView.
Amyotrophic lateral sclerosis (ALS) is a fatal disease that damages motor neurons. This study found that people with ALS show significant changes in blood fats and the proteins that carry them. Several apolipoproteins were higher, lipid balances were altered, and normal protein–lipid relationships were disrupted.
Finula I. Isik, Russell Pickford, Hannah C. Timmins, Olivier Piguet, Glenda M. Halliday, Matthew C. Kiernan, Woojin Scott Kim   +6 more
wiley   +1 more source