نتایج جستجو برای: angstrom

تعداد نتایج: 1421  

Journal: :فیزیک زمین و فضا 0
مسعود خوش سیما پژوهشکدۀ سامانه های ماهواره ای، پژوهشگاه فضایی ایران سیده سمانه ثابت قدم گروه فیزیک فضا، مؤسسۀ ژئوفیزیک دانشگاه تهران عباسعلی علی اکبری بیدختی گروه فیزیک فضا، موسسه ژئوفیزیک دانشگاه تهران

suspended aerosols in the atmosphere have strong impact on the global climate. they influence the earth’s radiation budget by scattering or absorbing both incoming and outgoing radiation. aerosols in troposphere are caused by natural sources, such as dust, sea-spray and volcanoes and also by anthropogenic sources, such as combustion of fossil fuels and biomass burning activities and from gas-to...

Journal: :Science 2015
Chuangye Yan Jing Hang Ruixue Wan Min Huang Catherine C L Wong Yigong Shi

Splicing of precursor messenger RNA (pre-mRNA) in yeast is executed by the spliceosome, which consists of five small nuclear ribonucleoproteins (snRNPs), NTC (nineteen complex), NTC-related proteins (NTR), and a number of associated enzymes and cofactors. Here, we report the three-dimensional structure of a Schizosaccharomyces pombe spliceosome at 3.6-angstrom resolution, revealed by means of s...

Journal: :Science 1998
H Luecke H T Richter J K Lanyi

Photoisomerization of the retinal of bacteriorhodopsin initiates a cyclic reaction in which a proton is translocated across the membrane. Studies of this protein promise a better understanding of how ion pumps function. Together with a large amount of spectroscopic and mutational data, the atomic structure of bacteriorhodopsin, determined in the last decade at increasing resolutions, has sugges...

2011
Y. Hirayama

A sub-angstrom probe size has been achieved with a Cs corrector [1, 2] for a scanning transmission electron microscope (STEM). In general, in the alignment of the Cs corrector, a user needs to select the aberration that needs to be corrected on the basis of aberration measurements. Once wrong selection of aberrations to be corrected is executed, the number of measurements and corrections is inc...

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