Sudha Kartha,C(American Institute of Physics., January 13, 2007)
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Abstract:
Poly(methyl)methacrylate was made photoconducting by molecular doping and the
photoconductivity was investigated using modulated photocurrent technique . Low-temperature
current-voltage measurements showed that the transport mechanism was thermally activated
hopping. An experimental investigation of the photoconductivity action spectrum along with
theoretical calculation enabled an estimation of the diffusion coefficient of the material. The
presence of states with a distribution of lifetimes could be understood from the frequency response
of the photocurrent . The photocurrent was due to the field-assisted dissociation of these states.
Balarama Kaimal,S; Gireesh,G; Paulose,C S(Department of Biotechnology, January 4, 2007)
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Abstract:
Gamma amino outyric acid is a major
inhibitory neurotrarsr titter in the central nervous
system. In the preset study sv, Have investigate(' the
alteration of GABA receptor, In t he hrain stem of rats
during pancreatic regeneration. Three groups of rats
were used for the study: sham operated, 72 It and
7 days partially pancreatectonnsea. GABA was (juan-
(ified by [H]GABA receptor iispiacement method.
GABA receptor kin: 10, pat at i et•ers were studied by
using the binding of F'.](iAhA as ligand to the Triton
X-100 treated me,i1,;-:mes a1,J displacement with
unlabelled GABA. GhRA,v receptor activity was
studied by using the [` -1 h3cuculline and displacement
with unlabellecV euculline. ;.\13A content significantly
decreased (1' < (1.(101 ) it, 0-e brain stern during
the regeneration of pancreas. 'I hl, high affinity (IAI3A
receptor binding sho?:ed it sigii'f cant decrease in 131„.,\
(P < 11.01) and K,I 1).05) n 72 h and 7 days after
partial pancreatee 'timv. ";:flhicuculline hin(Iing
showed it signih eat, 'le ( r(, :,e in /Jn1,s and K,I
(P < 0.001) in 72 h pa^.rcreaw,, mised rats when compared
with sham wt--tt' as P,n and K,I reversed to
near sham after 7 da,s of pancreatectomv. The results
sugge,) that GAB A throur,r; ('GABA receptors in
brain Atcem has a regulatory uie during active regeneration
of pancreas which will have inunense clinical
significance in the treatment of cliahetcs.
Gopalapillai,Indulal; Ivan,Gutman; Vijayakumar,Ambat(Department of Mathematics, August 25, 2007)
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Abstract:
The D-eigenvalues of a graph G are the eigenvalues of its distance matrix D, and the
D-energy ED(G) is the sum of the absolute values of its D-eigenvalues. Two graphs are
said to be D-equienergetic if they have the same D-energy. In this note we obtain bounds
for the distance spectral radius and D-energy of graphs of diameter 2. Pairs of equiregular
D-equienergetic graphs of diameter 2, on p = 3t + 1 vertices are also constructed.
Seena, E B; Prathapachandra Kurup, M R(Elsevier, 2007)
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Abstract:
Three copper(II) complexes of salicylaldehyde N(4)-phenyl thiosemicarbazone (H2L1) and two copper(II) complexes of N(4)-cyclohexyl thiosemicarbazone (H2L2) have been synthesized and characterized by different physicochemical techniques like magnetic studies and electronic, infrared and EPR spectral studies. The complexes View the MathML source and [(CuL2)2] (4) having dimeric structure. The thiosemicarbazones bind to the metal as dianionic ONS donor ligand in all the complexes, except in the complex [Cu(HL1)2] · H2O (2). In complex 2, the ligand moieties are coordinated as monoanionic (HL−) ones. Two of the complexes [CuL1dmbipy] · H2O (3) and [CuL2dmbipy] (5) have been found to possess the stoichiometry [CuLB], where B = 4,4′-dimethyl-2,2′-bipyridine (dmbipy). The coordination geometry around copper(II) in 5 is trigonal bipyramidal distorted square based pyramidal (TBDSBP), as obtained by X-ray diffraction studies.
Jayaraj, M K(Electrochemical Society, July 18, 2007)
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Abstract:
ZnGa2O4:Dy3+ phosphor thin films were deposited on quartz substrates by radio frequency rf magnetron sputtering and the effect
of substrate temperature on its structural and luminescent properties was investigated. Polycrystalline film could be deposited even
at room temperature. The crystalline behavior, Zn/Ga ratio, and surface morphology of the films were found to be highly sensitive
to substrate temperature. Under UV illumination, the as-deposited films at and above 300°C gave white luminescence even
without any postdeposition treatments. The photoluminescent PL emission can be attributed to the combined effect of multicolor
emissions from the single luminescence center Dy3+ via host-sensitization. Maximum PL emission intensity was observed for the
film deposited at 600°C, and the CIE chromaticity coordinates of the emission were determined to be x,y = 0.34, 0.31 .
Manoj, Easwaran potti; Prathapachandra Kurup, M R; Fun, Hoong-Kun(Elsevier, 2007)
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Abstract:
A novel N4O coordination mode offers carbohydrazone ligands as a building block for interesting frameworks through self-assembly. Bridging mode of oxygen of bis(2-benzoylpyridine ketone) carbohydrazone (H2L) with metal centers facilitates the formation of the macrocyclic molecular square [Zn(HL)]4(BF4)4 · 10H2O, offers wide range of applications for carbohydrazones.
Indulal, G; Vijayakumar, A(Springer, October , 2007)
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Abstract:
The energy of a graph G is the sum of the absolute values of its eigenvalues. In this
paper, we study the energies of some classes of non-regular graphs. Also the spectrum
of some non-regular graphs and their complements are discussed.