Sediment and organic matter properties, and molecular formula from sampling locations in the Northern Black Sea

Remineralization of organic matter in reactive marine sediments releases nutrients and dissolved organic matter (DOM) into the ocean. Here we focused on the molecular-level characterization of DOM by high-resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) in sediment pore waters and bottom waters from contrasting redox regimes in the northern Black Sea with particular emphasis on nitrogen-bearing compounds to derive an improved understanding of the molecular transformations involved in nitrogen release. The number of nitrogen-bearing molecules is generally higher in pore waters than in bottom waters. This suggests intensified degradation of nitrogen-bearing precursor molecules such as proteins in anoxic sediments: No significant difference was observed between sediments deposited under oxic vs anoxic conditions (average O/C ratios of 0.55) suggesting that the different organic matter quality induced by contrasting redox conditions does not impact protein diagenesis in the subseafloor. Compounds in the pore waters were on average larger, less oxygenated, and had a higher number of unsaturations. Applying a mathematical model, we could show that the assemblages of nitrogen-bearing molecular formulas are potential products of proteinaceous material that was transformed by the following reactions: (a) hydrolysis and deamination, both reducing the molecular size and nitrogen content of the products and intermediates; (b) oxidation and hydration of the intermediates; and (c) methylation and dehydration.

(Table S1, S4) Campanian-Maastrichtian benthic foraminifera from ODP Hole 113-690C

During the latest Cretaceous cooling phase, a positive shift in benthic foraminiferal d18O values lasting about 1.5 Myr (71.5-70 Ma) can be observed at a global scale (Campanian-Maastrichtian Boundary Event, CMBE). This d18O excursion is interpreted as being influenced by a change in intermediate- to deep-water circulation or by temporal build-up of Antarctic ice sheets. Here we test whether benthic foraminiferal assemblages from a southern high-latitudinal site near Antarctica (ODP Site 690) are influenced by the CMBE. If the d18O transition reflects a change in intermediate- to deep-water circulation from low-latitude to high-latitude water masses, then this change would result in cooler temperatures, higher oxygen concentration, and possibly lower organic-matter flux at the seafloor, resulting in a major benthic foraminiferal assemblage change. If, however, the d18O transition was mainly triggered by ice formation, no considerable compositional difference in benthic foraminiferal assemblages would be expected. Our data show a separation of the studied succession into two parts with distinctly different benthic foraminiferal assemblages. Species dominating the older part (73.0-70.5 Ma) tolerate less bottom water oxygenation and are typical components of low-latitude assemblages. In contrast, the younger part (70.0-68.0 Ma) is characterized by species that indicate well-oxygenated bottom waters and species common in high-latitude assemblages. We interpret the observed change in benthic foraminiferal assemblages toward a well-oxygenated environment to reflect the onset of a shift from low-latitude toward high-latitude dominated intermediate- to deep-water sources. This implies that a change in oceanic circulation was at least a major component of the CMBE.

Dissolved organic carbon concentrations, amino sugar concentrations and highly significantly correlating FT-ICR mass peak magnitudes obtained from solid phase extracted marine dissolved organic matter during POLARSTERN cruise ANT-XXV/1

Dissolved organic matter (DOM) was extracted with solid phase extraction (SPE) from 137 water samples from different climate zones and different depths along an Eastern Atlantic Ocean transect. The extracts were analyzed with Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) with electrospray ionization (ESI). D14C analyses were performed on subsamples of the SPE-DOM. In addition, the amount of dissolved organic carbon was determined for all water and SPE-DOM samples as well as the yield of amino sugars for selected samples. Linear correlations were observed between the magnitudes of 43% of the FT-ICR mass peaks and the extract D14C values. Decreasing SPE-DOM D14C values went along with a shift in the molecular composition to higher average masses (m/z) and lower hydrogen/carbon (H/C) ratios. The correlation was used to model the SPE-DOM D14C distribution for all 137 samples. Based on single mass peaks a degradation index was developed to compare the degradation state of marine SPE-DOM samples analyzed with FT-ICR MS. A correlation between D14C, degradation index, DOC values and amino sugar yield supports that SPE-DOM analyzed with FT-ICR MS reflects trends of bulk DOM. A relative mass peak magnitude ratio was used to compare aged SPE-DOM and fresh SPE-DOM regarding single mass peaks. The magnitude ratios show a continuum of different reactivities for the single compounds. Only few of the compounds present in the FT-ICR mass spectra are expected to be highly degraded in the oldest water masses of the Pacific Ocean. All other compounds should persist partly thermohaline circulation. Prokaryotic (bacterial) production, transformation and accumulation of this very stable DOM occurs probably primarily in the upper ocean. This DOM is an important contribution to very old DOM, showing that production and degradation are dynamic processes.

2000 Ice Hockey Team

Front Row (L-R): Asst. Coach Billy Powers, Josh Blackburn, Krikor Arman, Sean Peach, Head Coach Red Berenson, Andrew Merrick, Kevin Magnuson, Kevin O'Malley, Associate Head Coach Mel Pearson

Second Row (L-R): L.J. Scarpace, Andy Hilbert, Bob Gassoff, Bill Trainor, Scott Matzka, Mark Kosick, Mike Comrie, John Shouneyia, Mike Cammalleri, J.J. Swistak

Third Row (L-R): Mark Mink, Craig Murray, Jay Vancik, Jeff Jillson, Dave Huntzicker, Josh Langfeld, Geoff Koch, Jed Ortmeyer

Fourth Row (L-R): Athletic Trainer Rick Bancroft, Student Equipment Manager Eric Sikkenga, Equipment Manager Ian Hume, Student Equipment Manager Jeff Conrad, Student Equipment Manager Royce Wilkerson, Video Coordinator Josh Richelew

2000 Ice Hockey Team posed with CCHA Trophy

Front Row (L-R): Asst. Coach Billy Powers, Josh Blackburn, Krikor Arman, Sean Peach, Head Coach Red Berenson, Andrew Merrick, Kevin Magnuson, Kevin O'Malley, Associate Head Coach Mel Pearson

Second Row (L-R): L.J. Scarpace, Andy Hilbert, Bob Gassoff, Bill Trainor, Scott Matzka, Mark Kosick, Mike Comrie, John Shouneyia, Mike Cammalleri, J.J. Swistak

Third Row (L-R): Mark Mink, Craig Murray, Jay Vancik, Jeff Jillson, Dave Huntzicker, Josh Langfeld, Geoff Koch, Jed Ortmeyer

Fourth Row (L-R): Athletic Trainer Rick Bancroft, Student Equipment Manager Eric Sikkenga, Equipment Manager Ian Hume, Student Equipment Manager Jeff Conrad, Student Equipment Manager Royce Wilkerson, Video Coordinator Josh Richelew

1981 University of Michigan Men's Golf Team

Back Row: Tom Pursel, Ed Frutig, Steve Maddalena, Kip Owen, Ryan Wiezycki, Jim Becker

Front Row: Jim Yaffee, Gary Zenkel?, Mark DeWitt, John Morse, David Koch, Ed Humenik

1981 University of Michigan Men's Golf Team

Back Row: coach Tom Simon, Ryan Wiezycki, Kipp Owen, Ed Frutig, Tom Pursel, Steve Maddalena, Gary Zenkel, asst. coach Jim Carras

Front Row: Mark DeWitt, Jim Becker, Jim Yaffee, Ed Humenik, John Morse, David Koch

1991 University of Michigan Men's Golf Team

Back Row: James Carson, Denny Sikkila, Anthony Dietz, Mark Gaynor, Bob Henighan

Front Row: Carl Condon, Dave Jessop, Mark Kiesel, Brad Koch, John Higgins, Dean Kobane

missing: Patrick Moore

1979 University of Michigan Men's Golf Team

Back Row: assistant coach Jim Carras, Bruce Patterson, Phil Mokris, David Koch?, Frank Sims, coach Tom Simon

Front Row: Peter Pafford, Jim Marshall, Tom Pursell, Steve Maddalena

Income tax treaties. The income tax conventions of the United States with Great Britain, Canada, and other countries,

Bibliography: p. xxiii-xxxviii.

Tire treadwear validation. Volume 1: technical report. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

The Bibliothèque nationale ...

Mode of access: Internet.

Psychology : a study of a science.

Mode of access: Internet.

Perspectives on state-EPA grant activities /

Mode of access: Internet.