Tags: Inorganic Seminar


Advances in Tuning of Ferromagnetism in MoS2 Nanosheets

In the past decade, two dimensional (2D) nanomaterials has been an active area of research due to their unique mechanical and electronic properties.1 MoS2 nanosheets is one of the most studied 2D nanomaterial. MoS2 nanosheets have attracted special attention due to their intrinsic band gap, highly tunable charge carrier type and high on/off ratio.2 MoS2 nanosheets are ideal materials for semiconductor devices such as field-effect transistors3,…


Technical study of an Egyptian Mummy Portrait in the Carlos Museum

This portrait of a young man was previously described as a “heavily restored pastiche” of “dubious authenticity.” Technical investigation reveals evidence of its ancient materials and its modern recreation. This study combines stylistic and iconographic evaluation with materials analysis and multispectral imaging to map the many fragments within this portrait and clarify their associations. This study reappraises the Carlos portrait to consider…


Targeting the Efficiency and Selectivity Challenges for Molecular Electrocatalysts that Reduce CO2 to Formic Acid

Currently, energy generation is one of the major global concerns for sustainable development. The large consumption of non-renewable fossil fuels has caused high atmospheric CO2 concentrations, contributing to global warming as well as future energy shortages.1 The conversion of atmospheric CO2, a harmful greenhouse gas, to an energy source could mitigate both energy shortages as well as global warming.1 Non-toxic HCOOH is one such energy source…


2D Heterostructures for Energy Storage and Electronics: Exploring the Limits of Weak and Strong Interlayer Interactions

Scott C. Warren, Ph.D. The ability to alter distances between atoms is among the most important tools in materials design.  Despite this importance, controlling the interlayer distance in stacks of 2D materials remains a challenge.  This talk will present two strategies for controlling this distance, thereby giving rise to several fascinating new classes of materials for electronics and energy storage. In the first strategy, we self-…


Targeting the Efficiency and Selectivity Challenges for Molecular Electrocatalysts that Reduce CO2 to Formic Acid


Mitochondrial Fe-S cluster assembly in Arabidopsis thaliana

In plants, three Fe-S cluster assembly pathways exist namely SUF, ISC and CIA, involved in the maturation of iron sulfur proteins in the plastid, mitochondria and cytosol respectively. In this talk, we report on anaerobic purification of three classes of recombinant mitochondrial Fe-S cluster carrier proteins from A. thaliana, namely GRXS15, ISCA1a/2, and NFU4/5, and characterization of their Fe-S cluster content using UV-visible absorption/CD,…


Characterization of [2Fe-2S] Clusters in Monothiol Glutaredoxin-BolA Complexes and ASP1 a Novel Phosphatase/Kinase

Iron sulfur clusters are common cofactors found in almost all living organisms. They have diverse biological functions, ranging from electron transfer and catalysis to regulation of gene expression and enzyme activity. Glutaredoxin (Grx) proteins are found in both eukaryotic and prokaryotic organisms.  One class, called monothiol Grxs, functions as carrier proteins for Fe-S cluster biosynthesis by virtue of their ability to bind [2Fe-2S]…


Lactate Racemase and its Novel Nickel-Pincer Nucleotide Cofactor

Lactic acid, a central metabolic intermediate of many cells, occurs as L- and D-isomers that are interconverted by lactate racemase. This enzyme from Lactobacillus plantarum is encoded by LarA and harbors a tethered nickel-pincer nucleotide (NPN) coenzyme derived from niacin. Synthesis of the enzyme-bound cofactor requires LarB, a carboxylase/hydrolase of nicotinic acid adenine dinucleotide (NaAD); LarE, a Mg·ATP-dependent sacrificial sulfur…


Molybdenum Oxides and Neuromorphic Computing

As modern electronic devices shrink, existing silicon-based technology struggles to reliably retain charge, presenting theoretical and physical limitations for these applications. Recently, ionic/electronic hybrid three-terminal memristive devices have been engineered to emulate biological synaptic functions, allowing for the concomitant storage and processing of information. While these devices are still in infancy, brain-inspired information…


Ancient enzymology. Formate dehydrogenases and the reduction of CO2

We have examined the rapid reaction kinetics and spectroscopic properties of the molybdenum-containing, NAD+-dependent FdsABG formate dehydrogenase from C. necator, demonstrating the direct transfer of the substrate Ca hydrogen to the molybdenum center of the enzyme in the course of the reaction. In light of recent advances in our understanding of the structure of the molybdenum center propose a reaction mechanism involving direct hydride…
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