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Scott, Joe,Yang, Eun-Chan,West, John A.,Yokoyama, Akiko,Kim, Hee-Jeong,De Goer, Susan Loiseaux,O'Kelly, Charles J.,Orlova, Evguenia,Kim, Su-Yeon,Park, Jeong-Kwang,Yoon, Hwan-Su The Korean Society of Phycology 2011 ALGAE Vol.26 No.4
The marine unicellular red algal genus Rhodella was established in 1970 by L. V. Evans with a single species R. maculata based on nuclear projections into the pyrenoid. Porphyridium violaceum was described by P. Kornmann in 1965 and transferred to Rhodella by W. Wehrmeyer in 1971 based on plastid features and the non-parietal position of the nucleus. Molecular and fine structural evidences have now revealed that Rhodella maculata and R. violacea are one species, so R. violacea has nomenclatural priority and the correct name is Rhodella violacea (Kornmann) Wehrmeyer. The status of families within Rhodellophyceae was examined. The order Dixoniellales and family Dixoniellaceae are emended to include only Dixoniella and Neorhodella. The order Rhodellales and family Rhodellaceae are emended to include Rhodella and Corynoplastis. Glaucosphaera vacuolata Korshikov and the Glaucosphaeraceae Skuja (1954) with an emended description are transferred to the Glaucosphaerales ord. nov.
Joe Scott,Eun Chan Yang,John A. West,Akiko Yokoyama,Hee Jeong Kim,Susan Loiseaux de Goër,Charles J. O’Kelly,Evguenia Orlova,김수연,Jeong Kwang Park,윤환수 한국조류학회I 2011 ALGAE Vol.26 No.4
The marine unicellular red algal genus Rhodella was established in 1970 by L. V. Evans with a single species R. maculata based on nuclear projections into the pyrenoid. Porphyridium violaceum was described by P. Kornmann in 1965 and transferred to Rhodella by W. Wehrmeyer in 1971 based on plastid features and the non-parietal position of the nucleus. Molecular and fine structural evidences have now revealed that Rhodella maculata and R. violacea are one species, so R. violacea has nomenclatural priority and the correct name is Rhodella violacea (Kornmann) Wehrmeyer. The status of families within Rhodellophyceae was examined. The order Dixoniellales and family Dixoniellaceae are emended to include only Dixoniella and Neorhodella. The order Rhodellales and family Rhodellaceae are emended to include Rhodella and Corynoplastis. Glaucosphaera vacuolata Korshikov and the Glaucosphaeraceae Skuja (1954) with an emended description are transferred to the Glaucosphaerales ord. nov.
양은찬,John A. West,Joe Scott,윤환수,Akiko Yokoyama,Ulf Karsten,Susan Loiseaux de Goër,Evguenia Orlova 한국조류학회I 2011 ALGAE Vol.26 No.2
The unicellular marine red alga Erythrolobus australicus sp. nov. (Porphyridiophyceae) was isolated into laboratory culture from mangroves in Queensland and New South Wales, Australia. The single multi-lobed red to rose-red plastid has more than one pyrenoid and lacks a peripheral thylakoid. Arrays of small electron dense globules occur along the thylakoids. The nucleus is peripheral with a central to eccentric nucleolus. Each Golgi body is associated with a mitochondrion. The spherical cells are positively phototactic with slow gliding movement. The psaA + psbA phylogeny clearly showed that E. australicus is a distinct species, which is closely related to E. coxiae. The chemotaxonomically relevant and most abundant low molecular weight carbohydrate in E. australicus is floridoside with concentrations between 209and 231 μmol g^(-1) dry weight. Traces of digeneaside were also detected. These various approaches help to understand the taxonomic diversity of unicellular red algae.
Synthesis and characterization of the heavy-fermion compound CePtAl<sub>4</sub>Ge<sub>2</sub>
Shin, Soohyeon,Rosa, Priscila F.S.,Ronning, Filip,Thompson, Joe D.,Scott, Brian L.,Lee, Sangyun,Jang, Harim,Jung, Soon-Gil,Yun, Eunbhin,Lee, Hyoyoung,Bauer, Eric D.,Park, Tuson Elsevier 2018 JOURNAL OF ALLOYS AND COMPOUNDS Vol.738 No.-
<P><B>Abstract</B></P> <P>We report the synthesis of the Ce-based quaternary compound CePtAl<SUB>4</SUB>Ge<SUB>2</SUB> that crystallizes in the trigonal structure (space group <I>R</I> 3 ¯ <I>m</I>, 166) with unit cell parameters, <I>a</I> = 4.1995(5) Å, <I>c</I> = 31.851(7) Å, and γ = 120°. Powder X-ray diffraction and energy dispersive X-ray spectroscopy show that CePtAl<SUB>4</SUB>Ge<SUB>2</SUB> (LaPtAl<SUB>4</SUB>Ge<SUB>2</SUB>) is in a single, homogeneous phase. Magnetic susceptibility, electrical resistivity, and heat capacity measurements of CePtAl<SUB>4</SUB>Ge<SUB>2</SUB> show that it exhibits antiferromagnetic behavior below 2.3 K. The magnetic susceptibility for the magnetic field applied perpendicular (χ<SUB>ab</SUB>) and parallel (χ<SUB>c</SUB>) to the crystalline c-axis is very anisotropic, and the susceptibility ratio (χ<SUB>ab</SUB>/χ<SUB>c</SUB>) reaches a maximum value of 10, indicating that the spin easy axis is within the Ce plane. The entropy recovered at <I>T</I> <SUB>N</SUB> is consistent with the doublet ground state of the crystal field split <I>J</I> = 5/2 multiplet of Ce<SUP>3+</SUP> ions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CePtAl<SUB>4</SUB>Ge<SUB>2</SUB> synthesized by the Al/Ge flux method adopts the trigonal structure. </LI> <LI> CePtAl<SUB>4</SUB>Ge<SUB>2</SUB> is an antiferromagnet with <I>T</I> <SUB>N</SUB> of 2.3 K. </LI> <LI> CePtAl<SUB>4</SUB>Ge<SUB>2</SUB> is a heavy fermion compound with the effective mass of 205 mJ mol<SUP>−1</SUP> K<SUP>−2</SUP>. </LI> <LI> The entropy at <I>T</I> <SUB>N</SUB> is consistent with the doublet ground state of J = 5/2 of Ce<SUP>3+</SUP> ions. </LI> </UL> </P>