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Magnetic phase transitions in (Fe1−xTx)3Ga4 alloys (2000)

Al-Kanani, H. J. ; Booth, J. G. ; Ko, K. Y.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 87 (2000), S. 4879-4881

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: The magnetic ordering in the series of transition metal alloys (Fe1−xTx)3Ga4 with T=Ni and Ti having values of x in the range 0.05≤x≤0.20 has been investigated at high fields and low temperatures. Magnetization measurements revealed that in contrast to other T substitutions, Ni and Ti induce completely different types of effects on the magnetic properties. In the case of Ni substitution a ferrimagnetic-like type of magnetic order is induced at low compositions and low temperatures and Ti produces a ferromagnetic ground state. For Ti alloys with low composition as the temperature is increased a field induced transition starts to appear at about 50 K which persists up to room temperature suggesting a phase transition from a ferromagnetic to an antiferromagnetic state. The phase diagrams of the Ni and Ti system are explainable in terms of the Moriya-Usami and Isoda theories. Preliminary neutron diffraction measurements on the Ni alloys carried out at ILL suggest the existence of short-range order over a certain temperature range. The behavior observed so far on the various substituted systems leads us to believe that there is a clear relation between the magnetic properties and the relative position of the substitution element with respect to Fe in the Periodic Table. © 2000 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.373189

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Unique distribution of the anion exchange protein in the sea lamprey, Petromyzon marinus (2000)

Cameron, B. A. ; Gilmour, K. ; Forster, R. ; [et al.]

Springer

Journal of comparative physiology 170 (2000), S. 497-504

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ISSN: 1432-136X

Keywords: Key words Anion exchange ; AE1 ; Red blood cells ; Lamprey ; Respiration ; AbbreviationsA carbonic anhydrase activity ; CA carbonic anhydrase ; DIDS 4,4′ diisothiocyanatostilbene-2,2′ disulphonic acid ; GTC-AP guanidium isothiocyanate-acid phenol ; IgGs type G immunoglobins ; P red blood cell HCO−3 permeability ; PCR polymerase chain reaction ; rbc(s) red blood cell(s)

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Abstract The purpose of the present study was to examine the distribution of the anion exchange protein in the sea lamprey. Southern blots showed that genomic DNA of juvenile lampreys possesses several regions that are similar to segments of the AE gene from other vertebrates. However, physiological experiments examining rapid anion fluxes across the red blood cell (rbc) membrane and molecular experiments examining mRNA transcript levels both indicated that the anion exchange protein is absent in sea lamprey rbcs. In contrast, lamprey kidney, skeletal muscle, liver and heart tissue all appeared to possess mRNA transcripts for an AE protein. Further evidence for the presence of an AE protein in kidney tissue was obtained from Western blots. In order to evaluate the impact of the apparent rbc anion exchange limitations, the bicarbonate permeability of lamprey rbcs was also evaluated using mass spectrometry. The bicarbonate permeability of the lamprey rbc membrane was an order of magnitude lower than that of trout rbcs. Taken together, these results indicate that the gene for the AE protein is indeed present in lampreys, but it is not expressed in the rbc. Moreover, the process of CO2 transport in lamprey probably does not involve bicarbonate transport across the rbc membrane.