THE LATE DEVONIAN (FRASNIAN) PUNCTATA EVENT IN THE GREAT BASIN, U.S.A.: A NEW HIGH-RESOLUTION δ13CCARB AND MAGNETIC SUSCEPTIBILITY RECORD

2018 ◽  
Author(s):  
Todd A. LaMaskin ◽  
◽  
Krysden A. Schantz ◽  
Olivia A. Koster ◽  
Amelia A. Perry ◽  
...  
1990 ◽  
Vol 45 (11-12) ◽  
pp. 1248-1258 ◽  
Author(s):  
O. Böttcher ◽  
D. H. Sutter

AbstractHigh resolution zero field and Zeeman rotational spectra of 1 D-pyrazole have been studied by microwave Fourier-transform spectroscopy. The zero field hfs patterns allowed to improve the quadrupole coupling constants for both 14N nuclei. From the high field Zeeman multiplets the diagonal elements of the g-tensor were obtained as gaa= -0.1178(2),.gbb=-0.0762(2) and gcc = 0.0608 (2). The two independent components of the molecular magnetic susceptibility anisotropy in units of 10-6 erg G-2 mole- 1 are 2 ξaa - ξbb - ξcc= 52.69(32) and 2 ξbb - ξcc - ξaa = 39.32(29) were, a, b, c denote the molecular principal inertia axes. From these values the components of the molecular electric quadrupole moment tensor in units of 10-26 esu cm2 follow as Qaa = 5.84(22), Qbb= -0.58 (21) and Qcc= -5.27(38). Comparison with corresponding values for the undeuterated species leads to the complete tensors including their orientation with respect to the nuclear frame.


Boreas ◽  
2019 ◽  
Vol 49 (1) ◽  
pp. 181-199 ◽  
Author(s):  
Zoltán Püspöki ◽  
Tímea Fogarassy‐Pummer ◽  
Edit Thamó‐Bozsó ◽  
Bernadett Berényi ◽  
Ágnes Cserkész‐Nagy ◽  
...  

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Seulki Yoo ◽  
Joo-won Kim ◽  
John F. Schenck ◽  
Seung-Kyun Lee

Abstract The habenula plays an important role in brain reward circuitry and psychiatric conditions. While much work has been done on the function and structure of the habenula in animal models, in vivo imaging studies of the human habenula have been relatively scarce due to its small size, deep brain location, and lack of clear biomarkers for its heterogeneous substructure. In this paper, we report high-resolution (0.5 × 0.5 × 0.8 mm3) MRI of the human habenula with quantitative susceptibility mapping (QSM) at 3 T. By analyzing 48 scan datasets collected from 21 healthy subjects, we found that magnetic susceptibility contrast is highly non-uniform within the habenula and across the subjects. In particular, we observed high prevalence of elevated susceptibility in the posterior subregion of the habenula. Correlation analysis between the susceptibility and the effective transverse relaxation rate (R2*) indicated that localized susceptibility enhancement in the habenula is more associated with increased paramagnetic (such as iron) rather than decreased diamagnetic (such as myelin) sources. Our results suggest that high-resolution QSM could make a potentially useful tool for substructure-resolved in vivo habenula imaging, and provide a groundwork for the future development of magnetic susceptibility as a quantitative biomarker for human habenula studies.


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