5 research outputs found
Hybridization-induced superconductivity from the electron repulsion on a tetramer lattice having a disconnected Fermi surface
Plaquette lattices with each unit cell containing multiple atoms are good
candidates for disconnected Fermi surfaces, which are shown by Kuroki and Arita
to be favorable for spin-flucutation mediated superconductivity from electron
repulsion. Here we find an interesting example in a tetramer lattice where the
structure within each unit cell dominates the nodal structure of the gap
function. We trace its reason to the way in which a Cooper pair is formed
across the hybridized molecular orbitals, where we still end up with a T_c much
higher than usual.Comment: 4 pages, 6 figure
Microbiological Studies on Shallow Marine Areas―VI Thiosulfate-oxidizing bacteria isolated from shallow bay
Notes on Classification of Mixed Flagellation Type, Marine Bacteria Which Utilize Algal Polysaccharides
藻体多糖類を利用する混合べん毛型海洋細菌の分類についての知見
Mixed flagellation type was found on sixteen strains of marine bacteria which attack algal polysaccharide or chitin. Of these, six strains were identified as chitinoclastic Beneckea spp., but the digestion of agar or alginate was not a suitable property to characterize a genus in the family Achromobacteriaceae from a numerical analysis
浅海域の微生物学的研究-6 : 内湾から分離したチオ硫酸酸化性細菌
Twenty two strains of thiosulfate-oxidizing bacteria were isolated from sea water and bottom sediments of Omura Bay, west coast of Kyushu. The majority (73%) of the isolates highly utilized thiosulfate in the sea water organic media, and they were identified as thiobacilli group 0 by classification of HUTCHINSON et al. The test strains belonging to this group oxidized thiosulfate by constitutive or inductive enzyme system, and in the former cases, the growth of bacteria was stimulated by addition of thiosulfate. The others (27%) utilized thiosulfate only in the sea water inorganic media, though they grew in sea water organic media. In the previous paper, it was reported that every summer low concentration of hydrogen sulfide had been detected in the bottom layer of the bay indicating wide distribution of thiobacilli. The oxidation of hydrogen sulfide in sea water proceeds chemically to thiosulfate and sulfate. The former is said to be oxidized further by the bacteria. However, these marine bacteria have not been studied thoroughly. Recently, studies on thiobacilli in the marine environment have been reported by TILTON et al., and also by ADAIR & GUNDERSEN. Since their studies were based mainly on the utilization of thiosulfate in conjunction with the decrease of pH value in the culture, they did not isolate the ecologically important bacteria that utilize thiosulfate with the increase of pH value though the procedure itself was useful. On the other hand, they isolated some bacterial strains that required acidic pH value which could not exist in the natural sea water habitat. There are some problems which are yet to be solved. This study was made in an attempt to isolate from the bay the bacteria which have the ability to oxidize thiosulfate, and also to verify their characte ristics as well as to know the relation between the distribution and physiological activities in the bottom layer of the bay