Resurgent Serbian Nationalism: Six Centuries After Kosovo Polje

This week\u27s celebrations of a major new cathedral and of the 600th anniversary of the destruction of the medieval Serbian empire embody the positive and negative aspects of Serbian nationalism

Inflation and Decntralization in Yugoslavia

Ethnic strike and decentralization have prevented the Yugoslav authorities from overcoming rising inflation. The example of Yugoslavia as a model for economic reform is an instructive and worrisome one for other countries in Eastern Europe

Serbian Isolation of Albainian Prisoners Attacked

The Serbian policy of holding Albanian prisoners without filing charges against them and under conditions that often appear to involve use of torture has come under attack

Situation Report - Yugoslavia 18 September 1989

Articles relating to political pluralism in Poland and Yugoslavia, changes in Yugoslavian political party systems, the ninth conference of the Nonaligned Movement, and unemployment ion Yugoslavia

Situation Report - Yugoslavia 20 July 1989

Articles relating to the changing political climate of 1989 Yugoslavia, Serbain nationalism, Slobodan Milosevic\u27s 1989 speech at Kosovo, the issue of isolation and crisis of young people in Kosovo

Situation Report - Yugoslavia 17 August 1989

Articles relating to Yugoslavia\u27s economic and political situtation in 1989, the reuslts of the plenum of the Central Committee of the Legue of Communists, inflation within Yugoslavia, and Serbia\u27s 1989 public loan program

Electron Capture in Spin-Trap Capped Peptides. An Experimental Example of Ergodic Dissociation in Peptide Cation-Radicals

Electron capture dissociation was studied with tetradecapeptides and pentadecapeptides that were capped at N-termini with a 2-(4′-carboxypyrid-2′-yl)-4-carboxamide group (pepy), e.g., pepy-AEQLLQEEQLLQEL-NH2, pepy-AQEFGEQGQKALKQL-NH2, and pepy-AQEGSEQAQKFFKQL-NH2. Doubly and triply protonated peptide cations underwent efficient electron capture in the ion-cyclotron resonance cell to yield charge-reduced species. However, the electron capture was not accompanied by backbone dissociations. When the peptide ions were preheated by absorption of infrared photons close to the dissociation threshold, subsequent electron capture triggered ion dissociations near the remote C-terminus forming mainly (b11-14 + 1)+· fragment ions that were analogous to those produced by infrared multiphoton dissociation alone. Ab initio calculations indicated that the N-1 and N-1′ positions in the pepy moiety had topical gas-phase basicities (GB = 923 kJ mol−1) that were greater than those of backbone amide groups. Hence, pepy was a likely protonation site in the doubly and triply charged ions. Electron capture in the protonated pepy moiety produced the ground electronic state of the charge-reduced cation-radical with a topical recombination energy, RE = 5.43-5.46 eV, which was greater than that of protonated peptide residues. The hydrogen atom in the charge-reduced pepy moiety was bound by >160 kJ mol−1, which exceeded the hydrogen atom affinity of the backbone amide groups (21–41 kJ mol−1). Thus, the pepy moiety functioned as a stable electron and hydrogen atom trap that did not trigger radical-type dissociations in the peptide backbone that are typical of ECD. Instead, the internal energy gained by electron capture was redistributed over the peptide moiety, and when combined with additional IR excitation, induced proton-driven ion dissociations which occurred at sites that were remote from the site of electron capture. This example of a spin-remote fragmentation provided the first clear-cut experimental example of an ergodic dissociation upon ECD

Electrophoretic extraction and proteomic characterization of proteins buried in marine sediments

Proteins are the largest defined molecular component of marine organic nitrogen, and hydrolysable amino acids, the building blocks of proteins, are important components of particulate nitrogen in marine sediments. In oceanic systems, the largest contributors are phytoplankton proteins, which have been tracked from newly produced bloom material through the water column to surface sediments in the Bering Sea, but it is not known if proteins buried deeper in sediment systems can be identified with confidence. Electrophoretic gel protein extraction methods followed by proteomic mass spectrometry and database searching were used as the methodology to identify buried phytoplankton proteins in sediments from the 8-10 cm section of a Bering Sea sediment core. More peptides and proteins were identified using an SDS-PAGE tube gel than a standard 1D flat gel or digesting the sediment directly with trypsin. The majority of proteins identified correlated to the marine diatom, Thalassiosira pseudonana, rather than bacterial protein sequences, indicating an algal source not only dominates the input, but also the preserved protein fraction. Abundant RuBisCO and fucoxanthin chlorophyll a/c binding proteins were identified, supporting algal sources of these proteins and reinforcing the proposed mechanisms that might protect proteins for long time periods. Some preserved peptides were identified in unexpected gel molecular weight ranges, indicating that some structural changes or charge alteration influenced the mobility of these products during electrophoresis isolation. Identifying buried photosystem proteins suggests that algal particulate matter is a significant fraction of the preserved organic carbon and nitrogen pools in marine sediments

Identifying and Tracking Proteins Through the Marine Water Column: Insights Into the Inputs and Preservation Mechanisms of Protein in Sediments

Proteins generated during primary production represent an important fraction of marine organic nitrogen and carbon, and have the potential to provide organism-specific information in the environment. The Bering Sea is a highly productive system dominated by seasonal blooms and was used as a model system for algal proteins to be tracked through the water column and incorporated into detrital sedimentary material. Samples of suspended and sinking particles were collected at multiple depths along with surface sediments on the continental shelf and deeper basin of the Bering Sea. Modified standard proteomic preparations were used in conjunction with high pressure liquid chromatography-tandem mass spectrometry to identify the suite of proteins present and monitor changes in their distribution. In surface waters 207 proteins were identified, decreasing through the water column to 52 proteins identified in post-bloom shelf surface sediments and 24 proteins in deeper (3490 m) basin sediments. The vast majority of identified proteins in all samples were diatom in origin, reflecting their dominant contribution of biomass during the spring bloom. Identified proteins were predominantly from metabolic, binding/structural, and transport-related protein groups. Significant linear correlations were observed between the number of proteins identified and the concentration of total hydrolysable amino acids normalized to carbon and nitrogen. Organelle-bound, transmembrane, photosynthetic, and other proteins involved in light harvesting were preferentially retained during recycling. These findings suggest that organelle and membrane protection represent important mechanisms that enhance the preservation of protein during transport and incorporation into sediments