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Solar Torsional Oscillation in the Presence of Convection

Abstract: 

Solar Torsional Oscillation in the Presence of Convection

The torsional oscillation is a perturbation to the differential rotation in the convection zone of the sun that is spatially correlated with sunspot activity. Previous work has examined conditions necessary for the torsional oscillation to propagate through the convection zone using mean-field models with parameterized convection. This project examines the propagation behavior using an axisymmetric magnetohydrodynamic model utilizing explicit convection. Specifically, stationary perturbations will be generated at three different latitudes to provide a direct comparison to previous work. Further, perturbations traveling from a latitude of 45° both poleward and equatorward will be used to assess the effect of motion on the propagation. The resources at MSI are necessary because the simulations are very large. The grid contains 1,500 nodes, and three variables must be computed at each node. Each simulation will last for several million time steps. The code requires the use of an Intel Fortran compiler and MPI.

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Group name: 
moskowit

Treatment for Clostridium difficile Infections

MSI PIs Dan Knights ( Computer Science and Engineering - College of Science and Engineering ) and Michael Sadowsky ( Soil, Water, and Climate - College of Food, Agricultural, and Natural Resource Sciences ), are co-authors on a recent study supporting the value of fecal transplantation for the...

Startup Companies by MSI Researchers

The University of Minnesota announced recently that discoveries by University researchers were used to launch 12 startup companies in fiscal year 2012. This is a record number. You can read the news story describing the companies on the Office of the VP for Research (OVPR) Business blog . Several...

MSI Participates in CSE Family Fun Fair 2013

posted November 20, 2013 Last weekend, MSI staff members participated in the College of Science and Engineering’s 2013 Math and Science Family Fun Fair . The Fair was held on Saturday, November 16 in Coffman Memorial Union. This annual event is designed for young people to learn about science,...

MSI PIs Form Start-Ups in Fiscal Year 2014

posted on August 21, 2014 The Office of the Vice President for Research recently announced that a record 15 start-up companies based on University inventions were formed in Fiscal Year 2014, which ended on June 30, 2014. Several of these start-ups are headed up by MSI Principal Investigators. These...

MRSEC Receives NSF Grant

The University of Minnesota Materials Research Science and Engineering Center (MRSEC) has received a $17.8 million grant from the National Science Foundation . Over a dozen MSI Principal Investigators are participating faculty at the Center (see list below). The mission of the Center is to enable “...

Zeolite Nanosheets

Zeolites are porous silicate materials that are used in gas separation, catalysis, and other applications. Several MSI Principal Investigators are involved in a project to develop zeolite nanosheets—plate-like crystals—that are very desirable because of their packing and processing advantages. In...

Translational Informatics

Application of Informatics to Transcription of Ancient Papyri While computers can do many things, there are still a few areas in which humans excel such as the discriminatory power of the eye and the natural human ability to quickly classify objects. The visual ability of recognizing patterns is at...

Mechanistic Investigation of Allylic Azides

Abstract: 

Mechanistic Investigation of Allylic Azides

Allylic azides have been known to undergo spontaneous rearrangement to form an equilibrating mixture of branched and linear azides. Although the mechanism for such an event has been speculated in the past, detailed investigations have not been done yet to elucidate key intermediates or favorable energetic pathways. Experimentally, it has been shown that substituents on the allylic azide can affect the reaction equilibrium and subsequently the ratio of the equilibrating mixture. This equilibrium may also be influenced by interactions like hydrogen bonding of the substrate, however no experimental evidence substantiates these claims.

Computational studies can go a long way in gaining mechanistic insights of these reactions by identifying favorable transition states and/or reactive intermediates and role of various non-covalent binding events. These researchers envision that mechanistic analysis of the allylic azide rearrangement will provide insights for optimization of current reaction conditions. With these insights, the allylic azides can be synthetically converted to value added precious materials like chiral amines, which are important moieties in various substances like drugs, natural products, and more.

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Group name: 
topczews

Analysis of Gene Expression in Retinal Mononuclear Cells

Abstract: 

Analysis of Gene Expression in Retinal Mononuclear Cells

This lab is interested in the origin and nature of mononuclear cells in the retina. These cells are critical for the immune homeostasis of the eye, and are critical in determining and controlling appropriate immune responses to injury and inflammation. Many retinal mononuclear cells are phenotypically indistinguishable, thus making their exact origin and function hard to determine. These researchers are studying the transcription profile of individual cells to distinguish various mononuclear cells and to determine their exact origin and function. Recently, a paper was published (Cell 161:1214, 2015) cataloging all transcripts (the transcriptome) from 44,000 individual retinal cells and then determining cell type based on transcript patterns. These researchers are interested in mining this data to develop a set(s) of genes that can aid us in identification and distinguishing retinal mononuclear cells. Computing resources at MSI will be used to set up and analyze the large matrices (digitized gene expression files) associated with looking at the transcripts from each cell.

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Group name: 
gregerso

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