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Yan, Tsong‐Rong; Liau, Jian-Ching

doi:10.1023/a:1005310014070

Cited by 9 publications

(1 citation statement)

References 6 publications

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“…It is noteworthy that there exist several heterometallic molecular-based compounds with a magnetic structure, which can be properly described as one-dimensional chain of alternating spin-1/2 and spin-1 metal ions. Among the most common examples of the one-dimensional mixed spin-(1/2, 1) chains one could mention • CuNi(EDTA).6H 2 O, [12] • CuNi(pbaOH)(H 2 O) 3 .nH 2 O, [13] • CuNi(pba)(D 2 O) 3 .2D 2 O, [14] • PPh 4 [Ni(pn) 2 ][Fe(CN) 6 ]H 2 O, [15] • {Pr(bet) 2 (H 2 O) 3 Fe(CN) 6 }, [16] • {Ru(acac) 2 (CN) 2 }{Ni(dmphen)(NO 3 )}. [17] Even though the vast majority of aforementioned polymeric compounds should be preferentially regarded as experimental representatives of the mixed-spin quantum Heisenberg chain rather than the mixed-spin Ising chain, it is the authors' hope that our exact analytical results for the mixed spin-(1/2, 1) Ising chain may provide a deeper insight into several important vestiges of real physical behavior and explain some experimental results at least at a qualitative level.…”

Section: Introductionmentioning

confidence: 99%

Unusual field-induced transitions in exactly solved mixed spin-(1/2, 1) Ising chain with axial and rhombic zero-field splitting parameters

Strečka

Dančo

2011

Physica B: Condensed Matter

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The mixed spin-(1/2, 1) Ising chain with axial and rhombic zero-field splitting parameters in a presence of the longitudinal magnetic field is exactly solved within the framework of decoration-iteration transformation and transfer-matrix method. Our particular emphasis is laid on an investigation of the influence of the rhombic term, which is responsible for an onset of quantum entanglement between two magnetic states S z k = ±1 of the spin-1 atoms. It is shown that the rhombic term gradually destroys a classical ferrimagnetic order in the ground state and simultaneously causes diversity in magnetization curves including intermediate plateau regions, regions with a continuous change in the magnetization as well as several unusual field-induced transitions accompanied with magnetization jumps. Another interesting findings concern with an appearance of the round minimum in the temperature dependence of susceptibility times temperature data, the double-peak zerofield specific heat curves and the enhanced magnetocaloric effect. The temperature dependence of the specific heat with three separate maxima may also be detected when driving the system through the axial and rhombic zero-field splitting parameters close enough to a phase boundary between the ferrimagnetic and disordered states and applying sufficiently small longitudinal magnetic field.

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Section: Introductionmentioning

confidence: 99%

Unusual field-induced transitions in exactly solved mixed spin-(1/2, 1) Ising chain with axial and rhombic zero-field splitting parameters

Strečka

Dančo

2011

Physica B: Condensed Matter

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Substrate specificity and transglycosylation catalyzed by a thermostable β-glucosidase from marine hyperthermophile Thermotoga neapolitana

Park

Choi

Park

et al. 2005

Appl Microbiol Biotechnol

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The gene encoding beta-glucosidase of the marine hyperthermophilic eubacterium Thermotoga neapolitana (bglA) was subcloned and expressed in Escherichia coli. The recombinant BglA (rBglA) was efficiently purified by heat treatment at 75 degrees C, and a Ni-NTA affinity chromatography and its molecular mass were determined to be 56.2 kDa by mass spectrometry (MS). At 100 degrees C, the enzyme showed more than 94% of its optimal activity. The half-life of the enzyme was 3.6 h and 12 min at 100 and 105 degrees C, respectively. rBglA was active toward artificial (p-nitrophenyl beta-D: -glucoside) and natural substrates (cellobiose and lactose). The enzyme also exhibited activity with positional isomers of cellobiose: sophorose, laminaribiose, and gentiobiose. Kinetic studies of the enzyme revealed that the enzyme showed biphasic behavior with p-nitrophenyl beta-D: -glucoside as the substrate. Whereas metal ions did not show any significant effect on its activity, dithiothreitol and beta-mercaptoethanol markedly increased enzymatic activity. When arbutin and cellobiose were used as an acceptor and a donor, respectively, three distinct intermolecular transfer products were found by thin-layer chromatography and recycling preparative high-performance liquid chromatography. Structural analysis of three arbutin transfer products by MS and nuclear magnetic resonance indicated that glucose from cellobiose was transferred to the C-3, C-4, and C-6 in the glucose unit of acceptor, respectively.

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Efficient synthesis of gluco-oligosaccharides and alkyl-glucosides by transglycosylation activity of β-glucosidase from Sclerotinia sclerotiorum

Smaali

Maugard

Limam

et al. 2006

World J Microbiol Biotechnol

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An extracellular b-glucosidase (b-glu x) from Sclerotinia sclerotiorum was used as catalyst for the synthesis of gluco-oligosaccharides (GOSs) and alkyl-glucosides. The purified b-glu x was not regiospecific for b(1 fi 4) linkages in either hydrolysis or transglycosylation catalysed-reactions. It efficiently synthesized GOSs from cellobiose, gentiobiose and methyl b-D-glucoside by transglycosylation. At optimal conditions, 119 mg/ml of GOSs (~33%) were formed over 9 h from cellobiose as substrate. Alkylglucosides were also efficiently synthesized by transglycosylation of cellobiose in presence of different alcohols in biphasic media. However, their concentrations decreased as the size of the alcohol chain increased.

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Cited by 9 publications

References 6 publications

Unusual field-induced transitions in exactly solved mixed spin-(1/2, 1) Ising chain with axial and rhombic zero-field splitting parameters

Unusual field-induced transitions in exactly solved mixed spin-(1/2, 1) Ising chain with axial and rhombic zero-field splitting parameters

Substrate specificity and transglycosylation catalyzed by a thermostable β-glucosidase from marine hyperthermophile Thermotoga neapolitana

Efficient synthesis of gluco-oligosaccharides and alkyl-glucosides by transglycosylation activity of β-glucosidase from Sclerotinia sclerotiorum

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