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Simultaneous Co-deposition of Zn-Mg Alloy Layers on Steel Strip by PVD Process
( Tae Yeob Kim ),( Mark Goodenough ) 한국부식방식학회 2011 Corrosion Science and Technology Vol.10 No.6
This is the first release of an interim report on the development of coating technology of Zn-Mg alloy layers on steel strip by EML-PVD (electromagnetic levitation - physical vapor deposition) process in an air-to-air type continuous PVD pilot plant. It intends to introduce a basic principle of the EML-PVD process together with the high speed PVD pilot plant built in Posco. Due to the agitation effect provided by the high frequency induction coil, simultaneous evaporation of Zn and Mg from a droplet could produce alloy coating layers with Mg content of 6% to 12% depending on the composition of the droplet inside the coil. For its superior corrosion resistance, Zn-Mg alloy coated steel would be a very promising material for automotive, electrical appliances, and construction applications.
Novel approaches for generating and manipulating diploid strains of Chlamydomonas reinhardtii
Kariyawasam, Thamali,Joo, Sunjoo,Goodenough, Ursula,Lee, Jae-Hyeok The Korean Society of Phycology 2019 ALGAE Vol.34 No.1
Genetic study of haploid organisms offers the advantage that mutant phenotypes are directly displayed, but has the disadvantage that strains carrying lethal mutations are not readily maintained. We describe an approach for generating and performing genetic analysis of diploid strains of Chlamydomonas reinhardtii, which is normally haploid. First protocol utilizes self-mating diploid strains that will facilitate the genetic analysis of recessive lethal mutations by offering a convenient way to produce homozygous diploids in a single mating. Second protocol is designed to reduce the chance of contamination and the accumulation of spontaneous mutations for long-term storage of mutant strains. Third protocol for inducing the meiotic program is also included to produce haploid mutant strains following tetraploid genetic analysis. We discuss implication of self-fertile strains for the future of Chlamydomonas research.
Novel approaches for generating and manipulating diploid strains of Chlamydomonas reinhardtii
Thamali Kariyawasam,Sunjoo Joo,Ursula Goodenough,Jae-Hyeok Lee 한국조류학회I 2019 ALGAE Vol.34 No.1
Genetic study of haploid organisms offers the advantage that mutant phenotypes are directly displayed, but has thedisadvantage that strains carrying lethal mutations are not readily maintained. We describe an approach for generatingand performing genetic analysis of diploid strains of Chlamydomonas reinhardtii, which is normally haploid. First protocolutilizes self-mating diploid strains that will facilitate the genetic analysis of recessive lethal mutations by offering aconvenient way to produce homozygous diploids in a single mating. Second protocol is designed to reduce the chanceof contamination and the accumulation of spontaneous mutations for long-term storage of mutant strains. Third protocolfor inducing the meiotic program is also included to produce haploid mutant strains following tetraploid geneticanalysis. We discuss implication of self-fertile strains for the future of Chlamydomonas research.
Conducting-Polymer/Iron-Redox- Couple Composite Cathodes for Lithium Secondary Batteries
Park, K.-S.,Schougaard, S. B.,Goodenough, J. B. WILEY-VCH Verlag 2007 Advanced Materials Vol.19 No.6
<B>Graphic Abstract</B> <P>Physically or chemically attaching an Fe<SUP>III</SUP>/Fe<SUP>II</SUP> redox couple to the backbone of a conducting polymer leads to stabilization of the charge/discharge characteristics and higher electrode capacities. Composite cathodes made from LiFePO<SUB>4</SUB> particles bound to polypyrrole show enhanced electrode capacities and better rate capabilities, as shown in the figure. Chemically attaching ferrocene to the pyrrole backbone not only stabilizes the charge–discharge curves but also leads to higher capacity. <img src='wiley_img/09359648-2007-19-6-ADMA200600369-content.gif' alt='wiley_img/09359648-2007-19-6-ADMA200600369-content'> </P>
Eisosome Ultrastructure and Evolution in Fungi, Microalgae, and Lichens
Lee, Jae-Hyeok,Heuser, John E.,Roth, Robyn,Goodenough, Ursula American Society for Microbiology 2015 EUKARYOTIC CELL Vol.14 No.10
<P>Eisosomes are among the few remaining eukaryotic cellular differentations that lack a defined function(s). These trough-shaped invaginations of the plasma membrane have largely been studied in <I>Saccharomyces cerevisiae</I>, in which their associated proteins, including two BAR domain proteins, have been identified, and homologues have been found throughout the fungal radiation. Using quick-freeze deep-etch electron microscopy to generate high-resolution replicas of membrane fracture faces without the use of chemical fixation, we report that eisosomes are also present in a subset of red and green microalgae as well as in the cysts of the ciliate <I>Euplotes</I>. Eisosome assembly is closely correlated with both the presence and the nature of cell walls. Microalgal eisosomes vary extensively in topology and internal organization. Unlike fungi, their convex fracture faces can carry lineage-specific arrays of intramembranous particles, and their concave fracture faces usually display fine striations, also seen in fungi, that are pitched at lineage-specific angles and, in some cases, adopt a broad-banded patterning. The conserved genes that encode fungal eisosome-associated proteins are not found in sequenced algal genomes, but we identified genes encoding two algal lineage-specific families of predicted BAR domain proteins, called Green-BAR and Red-BAR, that are candidate eisosome organizers. We propose a model for eisosome formation wherein (i) positively charged recognition patches first establish contact with target membrane regions and (ii) a (partial) unwinding of the coiled-coil conformation of the BAR domains then allows interactions between the hydrophobic faces of their amphipathic helices and the lipid phase of the inner membrane leaflet, generating the striated patterns.</P>