نتایج جستجو برای: شاخص psi

تعداد نتایج: 82972  

2008
Heidi L. Eyre

Keller’s Personalized System of Instruction dominated the literature in the teaching of psychology and behavior analysis in the 1970s and 1980s. After this brief flourish of interest, PSI research trickled off to a nearly imperceptible stream in the 1990s. However, with the increasing availability and ease of use of computers and the internet, along with demand created by an ever-growing need f...

2005
Hugh O’Neill Barbara R. Evans Ida Lee Elias Greenbaum

Photosystem I (PSI) is one of the photosynthetic reaction centers that converts light energy into electrical and chemical energy. We report on two different experimental techniques to measure the open and closed circuit photovoltaic properties of PSI reaction centers in an aqueous environment. The combined techniques of atomic force microscopy and scanning surface probe microscopy were used to ...

Journal: :Journal of experimental botany 2010
Ian C Dodd Gregorio Egea Chris W Watts W Richard Whalley

To investigate the influence of different growing substrates (two mineral, two organic) on root xylem ABA concentration ([ABA](root)) and the contribution of the drying root system to total sap flow during partial rootzone drying (PRD), sunflower (Helianthus annuus L.) shoots were grafted onto the root systems of two plants grown in separate pots. Sap flow through each hypocotyl was measured be...

2016
Zi-Shan Zhang Li-Qiao Jin Yu-Ting Li Mikko Tikkanen Qing-Ming Li Xi-Zhen Ai Hui-Yuan Gao

Ultraviolet-B radiation (UV-B) is generally considered to negatively impact the photosynthetic apparatus and plant growth. UV-B damages PSII but does not directly influence PSI. However, PSI and PSII successively drive photosynthetic electron transfer, therefore, the interaction between these systems is unavoidable. So we speculated that UV-B could indirectly affect PSI under chilling-light con...

Journal: :Genetics 2003
Gary W Jones Daniel C Masison

We previously described an Hsp70 mutant (Ssa1-21p), altered in a conserved residue (L483W), that dominantly impairs yeast [PSI(+)] prion propagation without affecting growth. We generated new SSA1 mutations that impaired [PSI(+)] propagation and second-site mutations in SSA1-21 that restored normal propagation. Effects of mutations on growth did not correlate with [PSI(+)] phenotype, revealing ...

2008
Vadim Ermolayev Natalya Keberle Wolf-Ekkehard Matzke

The paper presents PSI1 Meta-Ontology – an upper level lightweight descriptive model for the set of the Core ontologies of PSI Suite. While PSI Suite is an interlinked modular library of ontologies describing the domain of engineering design performance in microelectronics, PSI Meta-Ontology is more domain-independent. It is an upper-level model of stateful creative dynamic processes, pro-activ...

2012
Weizhong Li Hamish McWilliam Mickael Goujon Andrew Peter Cowley Rodrigo Lopez William R. Pearson

UNLABELLED Iterative similarity searches with PSI-BLAST position-specific score matrices (PSSMs) find many more homologs than single searches, but PSSMs can be contaminated when homologous alignments are extended into unrelated protein domains-homologous over-extension (HOE). PSI-Search combines an optimal Smith-Waterman local alignment sequence search, using SSEARCH, with the PSI-BLAST profile...

2015
Imran Ashraf Sepideh Skandary Mohammad Y. Khaywah Michael Metzger Alfred J. Meixner Pierre M. Adam

The fluorescence of photosystem I (PSI) trimers in proximity to bimetallic plasmonic nanostructures have been explored by single-molecule spectroscopy (SMS) at cryogenic temperature (1.6 K). PSI serves as a model for biological multichromophore-coupled systems with high potential for biotechnological applications. Plasmonic nanostructures are fabricated by thermal annealing of thin metallic fil...

2018
Feng-Lei Zhou Zhanxiong Li Julie E. Gough Penny L. Hubbard Cristinacce Geoff J.M. Parker

Highly hydrophilic hollow polycaprolactone (PCL) microfibres were developed as building elements to create tissue-mimicking test objects (phantoms) for validation of diffusion magnetic resonance imaging (MRI). These microfibres were fabricated by the co-electrospinning of PCL-polysiloxane-based surfactant (PSi) mixture as shell and polyethylene oxide as core. The addition of PSi had a significa...

2014
Hnia Yaakoubi Saber Hamdani Laurent Bekalé Robert Carpentier

The photo-stability of photosystem I (PSI) is of high importance for the photosynthetic processes. For this reason, we studied the protective action of two biogenic polyamines (PAs) spermine (Spm) and spermidine (Spd) on PSI activity in isolated thylakoid membranes subjected to photoinhibition. Our results show that pre-loading thylakoid membranes with Spm and Spd reduced considerably the inhib...

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