78 research outputs found
Special Problems for Prosecutors in Public Corruption Prosecutions
The focus of this panel is not so much on the academic part of McDonnell, the case law. Of course, you’ll hear the name McDonnell and we’ll talk about that.
But we’re trying to talk a little more broadly about public corruption prosecutions in general. Some of these are unique issues. You heard a little bit about them from the former people who have done them, what special unique problems are involved in them and challenges the prosecutors face and what effect, if any
Zeeman Relaxation of Cold Atomic Iron and Nickel in Collisions with 3He
We have measured the ratio of the diffusion cross-section to the angular
momentum reorientation cross-section in the colliding Fe-3He and Ni-3He
systems. Nickel (Ni) and iron (Fe) atoms are introduced via laser ablation into
a cryogenically cooled experimental cell containing cold (< 1 K) 3He buffer
gas. Elastic collisions rapidly cool the translational temperature of the
ablated atoms to the helium temperature. The cross-section ratio is extracted
by measuring the decays of the atomic Zeeman sublevels. For our experimental
conditions, thermal energy is comparable to the Zeeman splitting. As a result,
thermal excitations between Zeeman sublevels significantly impact the observed
decay. To determine the cross-section ratio accurately, we introduce a model of
Zeeman state dynamics that includes thermal excitations. We find the
cross-section ratio for Ni-3He = 5 x 10^3 and Fe-3He <= 3 x 10^3 at 0.75 K in a
0.8 T magnetic field. These measurements are interpreted in the context of
submerged shell suppression of spin relaxation as studied previously in
transition metals and rare earth atoms.Comment: 10 pages, 5 figures; submitted to Phys. Rev.
An analytical study of iboga alkaloids contained in Tabernanthe iboga-derived products offered by ibogaine treatment providers
Therapeutic properties of ibogaine in the treatment of addiction are attracting both clinicians and patients to its use. Since ibogaine is not an authorized medicine, the quality of these products is not always known, increasing the probability of adverse reactions. Objective: This study collects different types of iboga-derived samples from treatment providers, vendors and online buyers to analyse their content. Methods: Analysis of iboga products (n = 16) was performed using gas chromatography and mass spectrometry methods (GC/MS). Products included Iboga root bark, Total Alkaloids (TA), Purified Total Alkaloids (PTA HCl), ibogaine hydrochloride (ibogaine HCl) and one Voacanga africana root bark. Results: The content of ibogaine was highly variable, ranging from 0.6% to 11.2% for products sold as iboga root bark, from 8.2% to 32.9% for products sold as TA, 73.7% for one sample sold as PTA and from 61.5% to 73.4% for products sold as ibogaine HCl. One sample did not show any iboga alkaloids. Other alkaloids and unknown substances were found in almost all samples. Discussion: The purity of iboga products is highly variable. These results should be taken into consideration by suppliers and users, especially regarding correct dosing to avoid overdose, as well as potential interactions with other substances
Mergers and Acquisitions in Latin America: Industrial Productivity and Corporate Governance
This paper examines the impact of industrial productivity on transnationals M&As from OECD countries towards Latin American countries in the period 1996 to 2010. It also analyzes the relationship between external mechanism of corporate governance and transnational M&As. For this purpose we use a gravitational model at the industry level. We find that industry productivity and higher standards of corporate governance in the country of origin promote transnational M&As activity. However, it is also found that higher levels of capital and technological productivity decreases transnational M&As activity
Decoding the Molecular Universe -- Workshop Report
On August 9-10, 2023, a workshop was convened at the Pacific Northwest
National Laboratory (PNNL) in Richland, WA that brought together a group of
internationally recognized experts in metabolomics, natural products discovery,
chemical ecology, chemical and biological threat assessment, cheminformatics,
computational chemistry, cloud computing, artificial intelligence, and novel
technology development. These experts were invited to assess the value and
feasibility of a grand-scale project to create new technologies that would
allow the identification and quantification of all small molecules, or to
decode the molecular universe. The Decoding the Molecular Universe project
would extend and complement the success of the Human Genome Project by
developing new capabilities and technologies to measure small molecules
(defined as non-protein, non-polymer molecules less than 1500 Daltons) of any
origin and generated in biological systems or produced abiotically. Workshop
attendees 1) explored what new understanding of biological and environmental
systems could be revealed through the lens of small molecules; 2) characterized
the similarities in current needs and technical challenges between each science
or mission area for unambiguous and comprehensive determination of the
composition and quantities of small molecules of any sample; 3) determined the
extent to which technologies or methods currently exist for unambiguously and
comprehensively determining the small molecule composition of any sample and in
a reasonable time; and 4) identified the attributes of the ideal technology or
approach for universal small molecule measurement and identification. The
workshop concluded with a discussion of how a project of this scale could be
undertaken, possible thrusts for the project, early proof-of-principle
applications, and similar efforts upon which the project could be modeled
Synthesis and Electronic Structure Determination of Uranium(VI) Ligand Radical Complexes
Pentagonal bipyramidal uranyl complexes of salen ligands, N,N’-bis(3-tert-butyl-(5R)-salicylidene)-1,2-phenylenediamine, in which R = tBu (1a), OMe (1b), and NMe2 (1c), were prepared and the electronic structure of the one-electron oxidized species [1a-c]+ were investigated in solution. The solid-state structures of 1a and 1b were solved by X-ray crystallography, and in the case of 1b an asymmetric UO22+ unit was found due to an intermolecular hydrogen bonding interaction. Electrochemical investigation of 1a-c by cyclic voltammetry showed that each complex exhibited at least one quasi-reversible redox process assigned to the oxidation of the phenolate moieties to phenoxyl radicals. The trend in redox potentials matches the electron-donating ability of the para-phenolate substituents. The electron paramagnetic resonance spectra of cations [1a-c]+ exhibited gav values of 1.997, 1.999, and 1.995, respectively, reflecting the ligand radical character of the oxidized forms, and in addition, spin-orbit coupling to the uranium centre. Chemical oxidation as monitored by ultraviolet-visible-near-infrared (UV-vis-NIR) spectroscopy afforded the one-electron oxidized species. Weak low energy intra-ligand charge transfer (CT) transitions were observed for [1a-c]+ indicating localization of the ligand radical to form a phenolate / phenoxyl radical species. Further analysis using density functional theory (DFT) calculations predicted a localized phenoxyl radical for [1a-c]+ with a small but significant contribution of the phenylenediamine unit to the spin density. Time-dependent DFT (TD-DFT) calculations provided further insight into the nature of the low energy transitions, predicting both phenolate to phenoxyl intervalence charge transfer (IVCT) and phenylenediamine to phenoxyl CT character. Overall, [1a-c]+ are determined to be relatively localized ligand radical complexes, in which localization is enhanced as the electron donating ability of the para-phenolate substituents is increased (NMe2 > OMe > tBu)
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