scholarly journals Nonequilibrium nuclear spin distribution function in quantum dots subject to periodic pulses

2017 ◽  
Vol 96 (20) ◽  
Author(s):  
Natalie Jäschke ◽  
Andreas Fischer ◽  
Eiko Evers ◽  
Vasilii V. Belykh ◽  
Alex Greilich ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Distribution Function ◽  
Nuclear Spin ◽  
Spin Distribution ◽  
Spin Distribution Function

scholarly journals Autonomic dysfunction and white matter microstructural changes in drug-naïve patients with Parkinson’s disease

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5539 ◽  
Author(s):  
Amir Ashraf-Ganjouei ◽  
Alireza Majd ◽  
Ali Javinani ◽  
Mohammad Hadi Aarabi
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Nervous System ◽  
Distribution Function ◽  
White Matter ◽  
Autonomic Dysfunction ◽  
Spin Distribution ◽  
Microstructural Changes ◽  
Spin Distribution Function ◽  
Drug Naïve

Background Autonomic dysfunction (AD) is one of the non-motor features of Parkinson’s disease (PD). Some symptoms tend to occur in the early stages of PD. AD also has a great impact on patient’s quality of life. In this study, we aimed to discover the association between AD (Scales for Outcomes in Parkinson’s disease-Autonomic, SCOPA-AUT) and microstructural changes in white matter tracts in drug-naïve early PD patients to elucidate the central effects of autonomic nervous system impairments. Method In total, this study included 85 subjects with PD recruited from the Parkinson’s Progression Markers Initiative (PPMI) database. Among the 85 PD patients, 38 were in Hoehn & Yahr stage 1 (HY1PD) and 47 were in stage 2 (HY2PD). Diffusion magnetic resonance imaging (DMRI) data were reconstructed in the MNI space using q-space diffeomorphic reconstruction to obtain the spin distribution function. The spin distribution function (SDF) values were used in DMRI connectometry analysis. We investigated through diffusion MRI connectometry the structural correlates of white matter tracts with SCOPA-AUT subscores and total score. Results Connectometry analysis also revealed positive association with white matter density in bilateral corticospinal tract in HY1PD patients and negative association in genu of corpus callosum (CC) and, bilateral cingulum in both groups. In addition, there were associations between gastrointestinal, sexual, thermoregulatory and urinary items and structural brain connectivity in PD. Conclusion Our study reveals positive correlation, suggesting neural compensations in early PD. Cingulum and CC tracts have well-known roles in PD pathology, compatible with our findings that bring new insights to specific areas of AD and its role in central nervous system (CNS) neurodegeneration, paving the way for using prodromal makers in the diagnosis and treatment of PD.

scholarly journals Nuclear spin depolarization via slow spin diffusion in single InAlAs quantum dots observed by using erase-pump-probe technique

2012 ◽  
Vol 111 (10) ◽  
pp. 103531 ◽  
Author(s):  
S. Adachi ◽  
R. Kaji ◽  
S. Furukawa ◽  
Y. Yokoyama ◽  
S. Muto
Keyword(s):  
Quantum Dots ◽  
Nuclear Spin ◽  
Spin Diffusion ◽  
Pump Probe ◽  
Probe Technique ◽  
Spin Depolarization

Resonant nuclear spin pumping in (In,Ga)As quantum dots

2011 ◽  
Vol 84 (4) ◽  
Author(s):  
R. V. Cherbunin ◽  
K. Flisinski ◽  
I. Ya. Gerlovin ◽  
I. V. Ignatiev ◽  
M. S. Kuznetsova ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Nuclear Spin ◽  
Spin Pumping

scholarly journals Effect of electron-nuclear spin interactions for electron-spin qubits localized in InGaAs self-assembled quantum dots

2005 ◽  
Vol 97 (4) ◽  
pp. 043706 ◽  
Author(s):  
Seungwon Lee ◽  
Paul von Allmen ◽  
Fabiano Oyafuso ◽  
Gerhard Klimeck ◽  
K. Birgitta Whaley
Keyword(s):  
Quantum Dots ◽  
Electron Spin ◽  
Nuclear Spin ◽  
Spin Qubits ◽  
Spin Interactions ◽  
Self Assembled
Sign in / Sign up

Export Citation Format

Share Document