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  • 1
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    Sulfation Rates of Particles in Calcium Looping Reactors (2013)
    Wiley
    Details
    Publication Date: 2013-12-07
    Description: The sulfation reaction rate of CaO particles in three reactors comprising a post-combustion calcium looping system is discussed: a combustion chamber generating flue gases, a carbonator reactor to capture CO 2 and SO 2 , and an oxy-fired calciner to regenerate the CO 2 sorbent. Due to its strong impact on the pore size distribution of CaO particles, the number of carbonation/calcination cycles arises as a new important variable to understand sulfation phenomena. Sulfation patterns change as a result of particle cycling, becoming more homogeneous with higher number of cycles. Experimental results from thermogravimetric tests demonstrate that high sulfation rates can be measured under all conditions tested, indicating that the calcium looping systems will be extremely efficient in SO 2 capture. Calcium looping reactors proved to be extremely efficient in SO 2 capture. The number of carbonation/calcination cycles evolved as a new important variable to understand sulfation phenomena because of its strong impact on the pore size distribution of CaO particles. The sulfation patterns become more homogeneous with increasing number of cycles.
    Print ISSN: 0930-7516
    Electronic ISSN: 1521-4125
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Published by Wiley
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  • 2
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    Unexpected ferromagnetic ordering enhancement with crystallite size growth observed in La0.5Ca0.5MnO3 nanoparticles (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-09-16
    Description: In this paper, the physical properties of half-doped manganite La 0.5 Ca 0.5 MnO 3 with crystallite sizes ranging from 15 to 40 nm are investigated. As expected, ferromagnetic order strengthens at expense of antiferromagnetic one as crystallite size is reduced to 15 nm. However, contrary to previously reported works, an enhancement of saturation magnetization is observed as crystallite size increases from 15 to 22 nm. This unexpected behavior is accompanied by an unusual cell volume variation that seems to induce ferromagnetic-like behavior at expense of antiferromagnetic one. Besides, field cooled hysteresis loops show exchange bias field and coercivity enhancement for increasing cooling fields, which suggest a kind of core-shell structure with AFM-FM coupling for crystallite sizes as small as 15 nm. It is expected that inner core orders antiferromagnetically, whereas uncompensated surface spins behave as spin glass with ferromagnetic-like ordering.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 3
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    EIN2, a bifunctional transducer of ethylene and stress responses in Arabidopsis (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-06-26
    Description: Ethylene regulates plant growth, development, and responsiveness to a variety of stresses. Cloning of the Arabidopsis EIN2 gene identifies a central component of the ethylene signaling pathway. The amino-terminal integral membrane domain of EIN2 shows similarity to the disease-related Nramp family of metal-ion transporters. Expression of the EIN2 CEND is sufficient to constitutively activate ethylene responses and restores responsiveness to jasmonic acid and paraquat-induced oxygen radicals to mutant plants. EIN2 is thus recognized as a molecular link between previously distinct hormone response pathways. Plants may use a combinatorial mechanism for assessing various stresses by enlisting a common set of signaling molecules.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Alonso, J M -- Hirayama, T -- Roman, G -- Nourizadeh, S -- Ecker, J R -- New York, N.Y. -- Science. 1999 Jun 25;284(5423):2148-52.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Plant Science Institute, Department of Biology, University of Pennsylvania, Philadelphia, PA 19104-6018, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10381874" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Arabidopsis/chemistry/genetics/growth & development/*physiology ; *Arabidopsis Proteins ; Carrier Proteins/chemistry ; *Cation Transport Proteins ; Cloning, Molecular ; Cyclopentanes/metabolism/pharmacology ; *Defensins ; Ethylenes/*metabolism/pharmacology ; Gene Expression Regulation, Plant ; Genes, Plant ; Genetic Complementation Test ; Herbicides/pharmacology ; *Iron-Binding Proteins ; Membrane Proteins/chemistry/genetics/*physiology ; Microsomes/metabolism ; Molecular Sequence Data ; Mutation ; Nuclear Proteins/physiology ; Oxylipins ; Paraquat/pharmacology ; Plant Growth Regulators/*metabolism/pharmacology ; Plant Proteins/chemistry/genetics/*physiology ; Plants, Genetically Modified ; Protein Biosynthesis ; Protein Structure, Secondary ; Receptors, Cell Surface/chemistry/genetics/*physiology ; *Signal Transduction ; *Transcription Factors
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Neuroscience. Neurons find strength through synchrony in the brain (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-06-17
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Alonso, Jose-Manuel -- New York, N.Y. -- Science. 2006 Jun 16;312(5780):1604-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Sciences, State University of New York College of Optometry, New York, NY 10036, USA. jalonso@sunyopt.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16778042" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Excitatory Postsynaptic Potentials ; Mice ; Neural Pathways ; Neurons/*physiology ; Rats ; Somatosensory Cortex/*physiology ; Synapses/*physiology ; *Synaptic Transmission ; Thalamus/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 5
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    Enhanced fitness conferred by naturally occurring variation in the circadian clock (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-11-08
    Description: Natural variation in clock parameters is necessary for the circadian clock to contribute to organismal fitness over a broad geographic range. Considerable variation is evident in the period, phase, and amplitude of 150 Arabidopsis accessions, and the period length is correlated with the day length at the latitude of origin, implying the adaptive significance of correctly regulated circadian timing. Quantitative trait loci analysis of recombinant inbred lines indicates that multiple loci interact to determine period, phase, and amplitude. The loss-of-function analysis of each member of the ARABIDOPSIS PSEUDO-RESPONSE REGULATOR family suggests that they are candidates for clock quantitative trait loci.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Michael, Todd P -- Salome, Patrice A -- Yu, Hannah J -- Spencer, Taylor R -- Sharp, Emily L -- McPeek, Mark A -- Alonso, Jose M -- Ecker, Joseph R -- McClung, C Robertson -- New York, N.Y. -- Science. 2003 Nov 7;302(5647):1049-53.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Dartmouth College, Department of Biological Sciences, Hanover, NH 03755, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14605371" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptation, Physiological ; Alleles ; Arabidopsis/genetics/*physiology ; Arabidopsis Proteins/genetics/*physiology ; Biological Clocks ; *Circadian Rhythm ; DNA, Bacterial ; Fourier Analysis ; *Genes, Plant ; *Genetic Variation ; Light ; Mutation ; Plant Leaves/*physiology ; *Quantitative Trait Loci ; Seasons ; Selection, Genetic ; Transcription Factors
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
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    Genome-wide insertional mutagenesis of Arabidopsis thaliana (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-08-02
    Description: Over 225,000 independent Agrobacterium transferred DNA (T-DNA) insertion events in the genome of the reference plant Arabidopsis thaliana have been created that represent near saturation of the gene space. The precise locations were determined for more than 88,000 T-DNA insertions, which resulted in the identification of mutations in more than 21,700 of the approximately 29,454 predicted Arabidopsis genes. Genome-wide analysis of the distribution of integration events revealed the existence of a large integration site bias at both the chromosome and gene levels. Insertion mutations were identified in genes that are regulated in response to the plant hormone ethylene.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Alonso, Jose M -- Stepanova, Anna N -- Leisse, Thomas J -- Kim, Christopher J -- Chen, Huaming -- Shinn, Paul -- Stevenson, Denise K -- Zimmerman, Justin -- Barajas, Pascual -- Cheuk, Rosa -- Gadrinab, Carmelita -- Heller, Collen -- Jeske, Albert -- Koesema, Eric -- Meyers, Cristina C -- Parker, Holly -- Prednis, Lance -- Ansari, Yasser -- Choy, Nathan -- Deen, Hashim -- Geralt, Michael -- Hazari, Nisha -- Hom, Emily -- Karnes, Meagan -- Mulholland, Celene -- Ndubaku, Ral -- Schmidt, Ian -- Guzman, Plinio -- Aguilar-Henonin, Laura -- Schmid, Markus -- Weigel, Detlef -- Carter, David E -- Marchand, Trudy -- Risseeuw, Eddy -- Brogden, Debra -- Zeko, Albana -- Crosby, William L -- Berry, Charles C -- Ecker, Joseph R -- New York, N.Y. -- Science. 2003 Aug 1;301(5633):653-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Genomic Analysis Laboratory, The Salk Institute for Biological Studies, La Jolla, CA 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12893945" target="_blank"〉PubMed〈/a〉
    Keywords: 3' Untranslated Regions ; 5' Untranslated Regions ; Alleles ; Arabidopsis/*genetics/metabolism ; Arabidopsis Proteins/genetics/metabolism ; Base Composition ; Chromosomes, Plant/genetics ; DNA, Bacterial/genetics ; DNA, Plant/chemistry/genetics ; Ethylenes/pharmacology ; Exons ; Expressed Sequence Tags ; Gene Expression ; Gene Expression Profiling ; Gene Expression Regulation, Plant/drug effects ; Genes, Plant ; *Genome, Plant ; Introns ; *Mutagenesis, Insertional ; Mutation ; Oligonucleotide Array Sequence Analysis ; Promoter Regions, Genetic ; Recombination, Genetic ; Rhizobium/genetics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
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    The ethylene signaling pathway (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-11-30
    Description: Plants use a structurally very simple gas molecule, the hydrocarbon ethylene, to modulate various developmental programs and coordinate responses to a multitude of external stress factors. How this simple molecule generates such a diverse array of effects has been the subject of intense research for the past two decades. A fascinating signaling pathway, with classical as well as novel plant-specific signaling elements, is emerging from these studies. We describe the four main modules that constitute this signaling pathway: a phosphotransfer relay, an EIN2-based unit, a ubiquitin-mediated protein degradation component, and a transcriptional cascade. The canonical and Arabidopsis ethylene signaling pathways in the Signal Transduction Knowledge Environment Connections Maps provide a complete panoramic view of these signaling events in plants.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Alonso, Jose M -- Stepanova, Anna N -- New York, N.Y. -- Science. 2004 Nov 26;306(5701):1513-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Genetics, North Carolina State University, Raleigh, NC 27695, USA. jmalonso@unity.ncsu.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15567852" target="_blank"〉PubMed〈/a〉
    Keywords: Arabidopsis/genetics/*metabolism ; Arabidopsis Proteins/genetics/metabolism ; Cell Nucleus/metabolism ; DNA-Binding Proteins ; Ethylenes/*metabolism ; Models, Biological ; Mutation ; Nuclear Proteins/genetics/metabolism ; Plant Proteins/chemistry/metabolism ; Plants/genetics/*metabolism ; Receptors, Cell Surface/chemistry/metabolism ; SKP Cullin F-Box Protein Ligases/metabolism ; *Signal Transduction ; Transcription Factors/genetics/metabolism ; Transcription, Genetic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    GUN4, a regulator of chlorophyll synthesis and intracellular signaling (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-02-08
    Description: Nuclear genes control plastid differentiation in response to developmental signals, environmental signals, and retrograde signals from plastids themselves. In return, plastids emit signals that are essential for proper expression of many nuclear photosynthetic genes. Accumulation of magnesium-protoporphyrin IX (Mg-Proto), an intermediate in chlorophyll biosynthesis, is a plastid signal that represses nuclear transcription through a signaling pathway that, in Arabidopsis, requires the GUN4 gene. GUN4 binds the product and substrate of Mg- chelatase, an enzyme that produces Mg-Proto, and activates Mg-chelatase. Thus, GUN4 participates in plastid-to-nucleus signaling by regulating Mg-Proto synthesis or trafficking.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Larkin, Robert M -- Alonso, Jose M -- Ecker, Joseph R -- Chory, Joanne -- New York, N.Y. -- Science. 2003 Feb 7;299(5608):902-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12574634" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Amino Acid Substitution ; Arabidopsis/*genetics/growth & development/metabolism ; Arabidopsis Proteins/chemistry/*genetics/isolation & purification/*metabolism ; Carrier Proteins/chemistry/*genetics/isolation & purification/*metabolism ; Cell Nucleus/metabolism ; Chlorophyll/*biosynthesis ; Chloroplasts/*metabolism ; Chromosome Mapping ; Chromosomes, Plant ; Cloning, Molecular ; Cyanobacteria/enzymology/genetics/metabolism ; Deuteroporphyrins/metabolism ; Enzyme Activation ; *Genes, Plant ; Genes, Reporter ; *Intracellular Signaling Peptides and Proteins ; Lyases/chemistry/isolation & purification/metabolism ; Magnesium/metabolism ; Molecular Sequence Data ; Mutation ; Mutation, Missense ; Protein Binding ; Protein Subunits/metabolism ; Protein Transport ; Protoporphyrins/*metabolism ; Recombinant Proteins/metabolism ; *Signal Transduction ; Thylakoids/chemistry/enzymology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
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    Localization of iron in Arabidopsis seed requires the vacuolar membrane transporter VIT1 (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-11-04
    Description: Iron deficiency is a major human nutritional problem wherever plant-based diets are common. Using synchrotron x-ray fluorescence microtomography to directly visualize iron in Arabidopsis seeds, we show that iron is localized primarily to the provascular strands of the embryo. This localization is completely abolished when the vacuolar iron uptake transporter VIT1 is disrupted. Vacuolar iron storage is also critical for seedling development because vit1-1 seedlings grow poorly when iron is limiting. We have uncovered a fundamental aspect of seed biology that will ultimately aid the development of nutrient-rich seed, benefiting both human health and agricultural productivity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kim, Sun A -- Punshon, Tracy -- Lanzirotti, Antonio -- Li, Liangtao -- Alonso, Jose M -- Ecker, Joseph R -- Kaplan, Jerry -- Guerinot, Mary Lou -- DK 30534/DK/NIDDK NIH HHS/ -- P42 ES07373/ES/NIEHS NIH HHS/ -- New York, N.Y. -- Science. 2006 Nov 24;314(5803):1295-8. Epub 2006 Nov 2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Sciences, Dartmouth College, Hanover, NH 03755, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17082420" target="_blank"〉PubMed〈/a〉
    Keywords: Arabidopsis/genetics/growth & development/*metabolism ; Arabidopsis Proteins/genetics/*metabolism ; Cation Transport Proteins/genetics/*metabolism ; Cotyledon/chemistry ; Homeostasis ; Hypocotyl/chemistry ; Image Processing, Computer-Assisted ; Intracellular Membranes/metabolism ; Iron/analysis/*metabolism ; Manganese/analysis ; Mutation ; Plant Epidermis/chemistry ; Plants, Genetically Modified ; Recombinant Fusion Proteins/metabolism ; Seedlings/growth & development ; Seeds/chemistry/*metabolism ; Tomography, X-Ray Computed ; Vacuoles/chemistry/*metabolism ; Zinc/analysis
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    Principles underlying sensory map topography in primary visual cortex (2016)
    Nature Publishing Group (NPG)
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    Publication Date: 2016-04-28
    Description: The primary visual cortex contains a detailed map of the visual scene, which is represented according to multiple stimulus dimensions including spatial location, ocular dominance and stimulus orientation. The maps for spatial location and ocular dominance arise from the spatial arrangement of thalamic afferent axons in the cortex. However, the origins of the other maps remain unclear. Here we show that the cortical maps for orientation, direction and retinal disparity in the cat (Felis catus) are all strongly related to the organization of the map for spatial location of light (ON) and dark (OFF) stimuli, an organization that we show is OFF-dominated, OFF-centric and runs orthogonal to ocular dominance columns. Because this ON-OFF organization originates from the clustering of ON and OFF thalamic afferents in the visual cortex, we conclude that all main features of visual cortical topography, including orientation, direction and retinal disparity, follow a common organizing principle that arranges thalamic axons with similar retinotopy and ON-OFF polarity in neighbouring cortical regions.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4860131/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4860131/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kremkow, Jens -- Jin, Jianzhong -- Wang, Yushi -- Alonso, Jose M -- EY005253/EY/NEI NIH HHS/ -- R01 EY005253/EY/NEI NIH HHS/ -- R01 EY020679/EY/NEI NIH HHS/ -- England -- Nature. 2016 May 5;533(7601):52-7. doi: 10.1038/nature17936. Epub 2016 Apr 27.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Graduate Center for Vision Research, State University of New York, College of Optometry, 33 West 42nd Street, New York, New York 10036, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27120164" target="_blank"〉PubMed〈/a〉
    Keywords: Afferent Pathways/radiation effects ; Animals ; Axons/physiology ; *Brain Mapping ; Cats ; Darkness ; Dominance, Ocular/physiology ; Light ; Macaca mulatta ; Male ; Models, Neurological ; Orientation/physiology/radiation effects ; Photic Stimulation ; Retina/physiology/radiation effects ; Space Perception/*physiology/radiation effects ; Thalamus/physiology/radiation effects ; Visual Cortex/*physiology/radiation effects ; Visual Fields/*physiology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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