1,367 research outputs found
Glutamatergic Control of Striatal Dopamine Release in Normal Rats and 6-OHDA Rats with Intrastriatal Grafts
Recent animal experiments suggest that transplanted neurons become integrated with the host brain. Neuroanatomical studies have shown that transplanted dopaminergic neurons can form synaptic connections on target cells in the host striatum. Other studies also have shown that grafted neurons not only innervate the host striatum but also receive afferent inputs from neurons of the host. However, little is known about the dynamic regulation of graft-derived dopamine (DA) release by the host brain. In normal animals, cortical neuronal input to the striatum is carried mainly via glutamate (Glu) neurons. Interactions between DA and Glu in the striatum are shown by in vivo and in vitro studies. Using in vivo microdialysis, the present study was carried out in order to elucidate the effects of glutamatergic agonists and Glu blockade on DA release in the normal striatum and in the striatum of 6-OHDA rats with dopamine grafts
An Accurate Determination of the Exchange Constant in Sr_2CuO_3 from Recent Theoretical Results
Data from susceptibility measurements on Sr_2CuO_3 are compared with recent
theoretical predictions for the magnetic susceptibility of the
antiferromagnetic spin-1/2 Heisenberg chain. The experimental data fully
confirms the theoretical predictions and in turn we establish that Sr_2CuO_3
behaves almost perfectly like a one-dimensional antiferromagnet with an
exchange coupling of J = 1700^{+150}_{-100}K.Comment: revised and reformatted paper with new title to appear in Phys. Rev B
(Feb.1996). 3 pages (revtex) with 3 embedded figures (macro included). A
complete postscript file is available from
http://fy.chalmers.se/~eggert/expsusc.ps or by request from
[email protected]
Characteristics of Japanese wrestlers with respect to function and structure of limbs
It is well known that hypertrophy and strength gain of the human skeletal muscle are induced by muscle training. It has also been shown that the training effect on size and strength of the skeletal muscle are altered the different athletic training protocols (1, 4). From these findings, it seems possible that wrestlers possess the hypertrophied muscle and stronger muscle strength by specific training.
In the present study, we assess the functional and structural characteristics of the skeletal muscle in Japanese wrestlers
Vectorial Control of Magnetization by Light
Coherent light-matter interactions have recently extended their applications
to the ultrafast control of magnetization in solids. An important but
unrealized technique is the manipulation of magnetization vector motion to make
it follow an arbitrarily designed multi-dimensional trajectory. Furthermore,
for its realization, the phase and amplitude of degenerate modes need to be
steered independently. A promising method is to employ Raman-type nonlinear
optical processes induced by femtosecond laser pulses, where magnetic
oscillations are induced impulsively with a controlled initial phase and an
azimuthal angle that follows well defined selection rules determined by the
materials' symmetries. Here, we emphasize the fact that temporal variation of
the polarization angle of the laser pulses enables us to distinguish between
the two degenerate modes. A full manipulation of two-dimensional magnetic
oscillations is demonstrated in antiferromagnetic NiO by employing a pair of
polarization-twisted optical pulses. These results have lead to a new concept
of vectorial control of magnetization by light
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