Results 41 to 50 of about 737,718 (307)

Modelling the Radical Chemistry on Ice Surfaces: An Integrated Quantum Chemical and Experimental Approach

Frontiers in Astronomy and Space Sciences, 2022
Heterogeneous radical processes on ice surfaces play a vital role in the formation of building blocks of the biologically relevant molecules in space. Therefore, quantitative mechanistic details of the radical binding and radical reactions on ices are ...
W. M. C. Sameera, W. M. C. Sameera, Bethmini Senevirathne, Bethmini Senevirathne, Thanh Nguyen, Yasuhiro Oba, Atsuki Ishibashi, Masashi Tsuge, Hiroshi Hidaka, Naoki Watanabe   +9 more
doaj   +1 more source

CHEMISTRY OF ANTARCTIC SNOW AND ICE [PDF]

Le Journal de Physique Colloques, 1987
We have studied 1000 samples of snow and ice from East and West Antarctica (coastal as well as central areas). These samples cover different time periods up to 30,000 years B.P.. In the meltwater, we have measured major ions (i.e. Na+, NH4+, K+, Ca++, Mg++, H+, Cl-, NO3-, and SO4--) using stringent contamination free tehniques.
openaire   +1 more source

The contribution of wood burning and other pollution sources to wintertime organic aerosol levels in two Greek cities [PDF]

Atmospheric Chemistry and Physics, 2017
The composition of fine particulate matter (PM) in two major Greek cities (Athens and Patras) was measured during two wintertime campaigns, one conducted in 2013 and the other in 2012.
K. Florou, D. K. Papanastasiou, M. Pikridas, C. Kaltsonoudis, E. Louvaris, G. I. Gkatzelis, D. Patoulias, N. Mihalopoulos, S. N. Pandis   +8 more
doaj   +1 more source

An upstream open reading frame regulates expression of the mitochondrial protein Slm35 and mitophagy flux

FEBS Letters, EarlyView.
This study reveals how the mitochondrial protein Slm35 is regulated in Saccharomyces cerevisiae. The authors identify stress‐responsive DNA elements and two upstream open reading frames (uORFs) in the 5′ untranslated region of SLM35. One uORF restricts translation, and its mutation increases Slm35 protein levels and mitophagy.
Hernán Romo‐Casanueva, Ariann E. Mendoza‐Martínez, P. Abril Medina‐Flores, Carlos Campero‐Basaldua, Alexander DeLuna, Soledad Funes   +5 more
wiley   +1 more source

Microbial and Geochemical Evidence of Permafrost Formation at Mamontova Gora and Syrdakh, Central Yakutia

Frontiers in Earth Science, 2021
Biotracers marking the geologic history and permafrost evolution in Central Yakutia, including Yedoma Ice Complex (IC) deposits, were identified in a multiproxy analysis of water chemistry, isotopic signatures, and microbial datasets.
M. Yu. Cherbunina, E. S. Karaevskaya, Yu. K. Vasil’chuk, N. I. Tananaev, D. G. Shmelev, N. A. Budantseva, A. Y. Merkel, A. L. Rakitin, A. V. Mardanov, A. V. Brouchkov, S. A. Bulat, S. A. Bulat   +11 more
doaj   +1 more source

Quantification of segregation dynamics in ice mixtures

, 2009
(Abridged) The observed presence of pure CO2 ice in protostellar envelopes is attributed to thermally induced ice segregation, but a lack of quantitative experimental data has prevented its use as a temperature probe. Quantitative segregation studies are
Bergin, Bergin, Bernstein, Bouwman, Chiar, Collings, Collings, Cuppen, Dartois, E. C. Fayolle, E. F. van Dishoeck, Ehrenfreund, Ehrenfreund, Fuchs, Garrod, Gerakines, Gerakines, Gerakines, H. Linnartz, H. M. Cuppen, Hodyss, Ioppolo, Jenniskens, K. I. Öberg, Knez, Loeffler, Los, Los, Merrill, Nummelin, Palumbo, Pontoppidan, Pontoppidan, Sandford, Sonnentrucker, Teolis, Tielens, van Broekhuizen, Visser, Watanabe, Watanabe, Zasowski, Öberg, Öberg   +43 more
core   +1 more source

Sequence determinants of RNA G‐quadruplex unfolding by Arg‐rich regions

FEBS Letters, EarlyView.
We show that Arg‐rich peptides selectively unfold RNA G‐quadruplexes, but not RNA stem‐loops or DNA/RNA duplexes. This length‐dependent activity is inhibited by acidic residues and is conserved among SR and SR‐related proteins (SRSF1, SRSF3, SRSF9, U1‐70K, and U2AF1).
Naiduwadura Ivon Upekala De Silva, Puspa Kunwar, Md Ibnul Rifat Rahman, Joanna Koryo Kwao, Nathan Lehman, Zihan Zhang, Trenton Paul, Claire Cheng, Nicholas Truex, Hui‐Ting Lee, Jun Zhang   +10 more
wiley   +1 more source

The Dominion Range Ice Core, Queen Maud Mountains, Antarctica - General Site and Core Characteristics with Implications [PDF]

, 2017
The Transantarctic Mountains of East Antarctica provide a new milieu for retrieval of ice-core records. We report here on the initial findings from the first of these records, the Dominion Range ice-core record.
Gow, Anthony J., Grootes, Pieter M., Lyons, W. Berry, Mayewski, Paul A., Meese, Debra A., Saltzman, Eric, Sowers, Todd, Spencer, Mary Jo, Twickler, Mark S., Watson, M. Scott   +9 more
core   +1 more source

Structural instability impairs function of the UDP‐xylose synthase 1 Ile181Asn variant associated with short‐stature genetic syndrome in humans

FEBS Letters, EarlyView.
The Ile181Asn variant of human UDP‐xylose synthase (hUXS1), associated with a short‐stature genetic syndrome, has previously been reported as inactive. Our findings demonstrate that Ile181Asn‐hUXS1 retains catalytic activity similar to the wild‐type but exhibits reduced stability, a looser oligomeric state, and an increased tendency to precipitate ...
Tuo Li, Pedro A. Sánchez‐Murcia, Bernd Nidetzky   +2 more
wiley   +1 more source

Chemistry of Greenland Ice Sheet studied

Eos, Transactions American Geophysical Union, 1991
The first ice coring project to include a major emphasis on the study of atmospheric processes and changes in the Greenland Ice Sheet that influence the chemistry of the ice core began in April of this year under the auspices of the Greenland Ice Sheet Project Two (GISP2).
Jean‐Luc Jaffrezo, Jack E. Dibb, Cliff I. Davidson   +2 more
openaire   +1 more source