Compositions of branched glycerol dialkyl glycerol tetraethers (GDGTs) in sediment samples from Bullenmoor peat bog, Northern Germany

Two types of intact branched glycerol dialkyl glycerol tetraethers (GDGTs) were detected in peat bog samples from Bullenmoor, Northern Germany. Glucuronosyl and glucosyl branched GDGTs comprise on average ca. 4% of the microbial intact polar lipids in the anoxic, acidic peat layer ca. 20 cm below the surface of the bog, suggesting an important ecological role for the source microorganisms. No corresponding phospholipids were detected. Notably, glycosidic branched GDGTs are 5-10 times less abundant than their intact isoprenoid counterparts derived from Archaea, while branched GDGT core lipids exceed their isoprenoid analogues by about an order of magnitude. These contrasting relationships may reflect lower standing stocks of the biomass of producers of branched GDGTs, combined with higher population growth rates relative to soil Archaea. Search strategies for the microbial producers of these conspicuous orphan lipids should benefit from the discovery of their intact polar precursors.

Age model, lipids, and iron/calcium-ratios of sediment core GeoB9307-3

Hide Intense debate persists about the climatic mechanisms governing hydrologic changes in tropical and subtropical southeast Africa since the Last Glacial Maximum, about 20,000 years ago. In particular, the relative importance of atmospheric and oceanic processes is not firmly established. Southward shifts of the intertropical convergence zone (ITCZ) driven by high-latitude climate changes have been suggested as a primary forcing, whereas other studies infer a predominant influence of Indian Ocean sea surface temperatures on regional rainfall changes. To address this question, a continuous record representing an integrated signal of regional climate variability is required, but has until now been missing. Here we show that remote atmospheric forcing by cold events in the northern high latitudes appears to have been the main driver of hydro-climatology in southeast Africa during rapid climate changes over the past 17,000 years. Our results are based on a reconstruction of precipitation and river discharge changes, as recorded in a marine sediment core off the mouth of the Zambezi River, near the southern boundary of the modern seasonal ITCZ migration. Indian Ocean sea surface temperatures did not exert a primary control over southeast African hydrologic variability. Instead, phases of high precipitation and terrestrial discharge occurred when the ITCZ was forced southwards during Northern Hemisphere cold events, such as Heinrich stadial 1 (around 16,000 years ago) and the Younger Dryas (around 12,000 years ago), or when local summer insolation was high in the late Holocene, i.e., during the last 4,000 years.

Physicochemical properties and fish occurrence in 35 Icelandic lakes housing Arctic charr (Salvelinus alpinus)

The common occurrence of parallel phenotypic patterns suggests that a strong relationship exists between ecological dynamics and micro-evolution. Comparative studies from a large number of populations under varying sets of ecological drivers could contribute to a better understanding of this relationship. We used data on morphology of arctic charr (Salvelinus alpinus) and ecological factors from 35 Icelandic lakes to test the hypothesis that morphological patterns among monomorphic charr populations from different lakes are related to interlake variation in ecological characteristics. There is extensive phenotypic diversity among populations of Icelandic charr, and populations are easily distinguished based on overall body morphology. The results obtained in the present study showed that the morphological diversity of charr was related to large-scale diversity in lake ecology. Variation in charr morphology was related to water origin (e.g. spring fed versus run-off), bedrock age, and fish community structure. The present study shows how various ecological factors can shape the biological diversity that we observe.

Revised calibration of the MBT-CBT paleotemperature proxy

The MBT-CBT proxy for the reconstruction of paleotemperatures and past soil pH is based on the distribution of branched glycerol dialkyl glycerol tetraether (brGDGT) membrane lipids. The Methylation of Branched Tetraether (MBT) and the Cyclisation of Branched Tetraether (CBT) indices were developed to quantify these distributions, and significant empirical relations between these indices and annual mean air temperature (MAT) and/or soil pH were found in a large data set of soils. In this study, we extended this soil dataset to 278 globally distributed surface soils. Of these soils, 26% contains all nine brGDGTs, while in 63% of the soils the seven most common brGDGTs were detected, and the latter were selected for calibration purposes. This resulted in new transfer functions for the reconstruction of pH based on the CBT index: pH = 7.90-1.97 × CBT (r**2 = 0.70; RMSE = 0.8; n = 176), as well as for MAT based on the CBT index and methylation index based on the seven most abundant GDGTs (defined as MBT'): MAT = 0.81-5.67 × CBT + 31.0 × MBT' (r**2 = 0.59; RMSE = 5.0 °C; n = 176). The new transfer function for MAT has a substantially lower correlation coefficient than the original equation (r**2 = 0.77). To investigate possible improvement of the correlation, we used our extended global surface soil dataset to statistically derive the indices that best describe the relations of brGDGT composition with MAT and soil pH. These new indices, however, resulted in only a relatively minor increase in correlation coefficients, while they cannot be explained straightforwardly by physiological mechanisms. The large scatter in the calibration cannot be fully explained by local factors or by seasonality, but MAT for soils from arid regions are generally substantially (up to 20 °C) underestimated, suggesting that absolute brGDGT-based temperature records for these areas should be interpreted with caution. The applicability of the new MBT'-CBT calibration function was tested using previously published MBT-CBT-derived paleotemperature records covering the last deglaciation in Central Africa and East Asia, the Eocene-Oligocene boundary and the Paleocene-Eocene thermal maximum. The results show that trends remain similar in all records, but that absolute temperature estimates and the amplitude of temperature changes are lower for most records, and generally in better agreement with independent proxy data.

Continental regionalism: Brazil's prominent role in the Americas. CEPS Working Document No. 374, February 2013

Brazil has a dual identity as a Latin American country and one of the BRICS (Brazil, Russia, India, China and South Africa). The regional and global dimensions of Brasilia’s foreign policy have been closely intertwined. Inspired by the idea of development and autonomy in the last ten years, Brazil has assumed a stronger regional leadership role. The result has been the emergence of a South American space, with Mercosur and Unasur as the main integration schemes. For Brazil, regionalism is not only a goal in itself but also an instrument for exerting global influence and for ‘soft-balancing’ the United States. Washington’s lower profile in the region has facilitated Brazil’s rise as a regional and even continental player, with a strong influence on the Latin American puzzle composed of many different pieces or concentric circles.

The EU and Brazil: Partnering in an uncertain world? CEPS Working Document No. 382, 13 May 2013

The international system is changing fast and both the European Union and Brazil will need to adapt. This paper argues that such a process of adjustment may bring the two closer together, even if their starting points differ considerably. Europe looks at the ongoing redistribution of power as a challenge, Brazil as an opportunity. Europe is coping with the detrimental impact of the economic crisis on its international profile; Brazil is enhancing its influence in its region and beyond. Their normative outlook is broadly compatible; their political priorities and behaviour in multilateral frameworks often differ, from trade to development and security issues. Despite the crisis, however, there are signals of renewed engagement by the EU on the international stage, with a focus on its troubled neighbourhood and partnerships with the US and large emerging actors such as Brazil. The latter is charting an original course in international affairs as a rising democratic power from the traditional South with no geopolitical opponents and a commitment to multilateralism. In testing the limits of its international influence, Brazil will need dependable partners and variable coalitions that go well beyond the BRICS format, which is not necessarily sustainable. This contribution suggests that the strategic partnership between the EU and Brazil may grow stronger not only as a platform to deepen economic ties and sustain growth, but also as a tool to foster cooperation in political and security affairs including crisis management, preventive diplomacy and human rights.

Innovative Capabilities and Market Performance: The European Union in International Comparison. Jean Monnet/Robert Schuman Paper Series Vol. 12, No. 7, September 2012

This paper investigates the EU’s international positioning in terms of innovative capabilities and global market performance by using most recent quantitative data on a wide branch of indicators. The EU’s performance is compared to the standings of its most important economic competitors and emerging economic powerhouses: the USA, Japan, China, Brazil, India, Russia and South Africa. By doing so, this paper offer insightful and deep information about the EU’s power to compete and rank in international economic affairs. It will be proofed that the European Union ranks in many of the indicators related to innovative capabilities in good position and the EU’s overall global market performance is excellent, whereas the BRICS are underachieving.

Exploring complementarities between goods and services trade in trade agreements

More than three decades of research on trade costs and goods trade have unveiled fundamental insights into the determinants, the nature and the consequences of goods trade agreements. A cottage literature has also evolved studying similar issues from a services trade perspective, but the two-way interaction between goods and services trade has not been explored formally. We bridge this gap by providing a formal treatment of the inter-linkages between goods and services trade. The model provides insights into how trade agreements impact goods and services trade. We also explore the impact of the complementarities of goods and services agreements on goods and services trade empirically using bilateral goods and services trade data for OECD and BRICS trading partners over 1995-2010.

Organic and inorganic geochemical measurements of sediment core GeoB7702-3

It has long been known that extreme changes in North African hydroclimate occurred during the late Pleistocene yet many discrepancies exist between sites regarding the timing, duration and abruptness of events such as Heinrich Stadial (HS) 1 and the African Humid Period (AHP). The hydroclimate history of the Nile River is of particular interest due to its lengthy human occupation history yet there are presently few continuous archives from the Nile River corridor, and pre-Holocene studies are rare. Here we present new organic and inorganic geochemical records of Nile Basin hydroclimate from an eastern Mediterranean (EM) Sea sediment core spanning the past 28 ka BP. Our multi-proxy records reflect the fluctuating inputs of Blue Nile versus White Nile material to the EM Sea in response to gradual changes in local insolation and also capture abrupt hydroclimate events driven by remote climate forcings, such as HS1. We find strong evidence for extreme aridity within the Nile Basin evolving in two distinct phases during HS1, from 17.5 to 16 ka BP and from 16 to 14.5 ka BP, whereas peak wet conditions during the AHP are observed from 9 to 7 ka BP. We find that zonal movements of the Congo Air Boundary (CAB), and associated shifts in the dominant moisture source (Atlantic versus Indian Ocean moisture) to the Nile Basin, likely contributed to abrupt hydroclimate variability in northern East Africa during HS1 and the AHP as well as to non-linear behavior of hydroclimate proxies. We note that different proxies show variable gradual and abrupt responses to individual hydroclimate events, and thus might have different inherent sensitivities, which may be a factor contributing to the controversy surrounding the abruptness of past events such as the AHP. During the Late Pleistocene the Nile Basin experienced extreme hydroclimate fluctuations, which presumably impacted Paleolithic cultures residing along the Nile corridor.

Sedimentary n-alkanes, their hydrogen isotopes, GDGTs and d15N as well as d13Corg of lake Nam Co, Tibet

The transition from the last Glacial to the current Interglacial, the Holocene, represents an important period with climatic and environmental changes impacting ecosystems. In this study, we examined the interplay between the Indian Ocean Summer Monsoon (IOSM) and the Westerlies at lake Nam Co, southern Tibet to understand the climatic effects on the ecosystem. Different organic geochemical proxies (n-alkanes, glycerol dialkyl glycerol tetraethers, dD, d13Corg, d15N) are applied to reconstruct the environmental and hydrological changes on one of the longest available paleorecords at the Tibetan Plateau. Based on our paleohydrological dD proxies, the aquatic signal lags the terrestrial one due to specific ecological thresholds, which, in addition to climatic changes, can influence aquatic organisms. The aquatic organisms' response strongly depends on temperature and associated lake size, as well as pH and nutrient availability. Because the terrestrial vegetation reacts faster and more sensitively to changes in the monsoonal and climatic system, the dD of n-C29 and the reconstructed inflow water signal represent an appropriate IOSM proxy. In general, the interplay of the different air masses seems to be primarily controlled by solar insolation. In the Holocene, the high insolation generates a large land-ocean pressure gradient associated with strong monsoonal winds and the strongest IOSM. In the last glacial period, however, the weak insolation promoted the Westerlies, thereby increasing their influence at the Tibetan Plateau. Our results help to elucidate the variable IOSM, and they illustrate a remarkable shift in the lake system regarding pH, d13Corg and d15N from the last glacial to the Holocene interglacial period.

Media diversity as a guarantee to cultural diversity: the promotion of identities from an international law approach

This article deals with several international instruments which provide legal guarantees for media diversity, which is essential for the promotion of cultural diversity. Based on several articles of the Convention of cultural diversity, the General Comment of the Committee on Economic, Social and Cultural Rights No. 21 on the right to take part in cultural life, as well as the work of the UN Independent Expert on Cultural Rights, this article aims to identify legal tools for the establishing of measures promoting cultural diversity in the media. This article looks at the case study of Honduran Garifuna community radios. It emphasizes the importance of taking into account the economic aspects of cultural and communicational rights.

Las potencias subregionales en el sistema internacional de posguerra fría: ¿nuevos actores en la política internacional?

En trabajos anteriores, hemos avanzado en la identificación y diferenciación de tres categorías de potencias: potencias mundiales, potencias medias y potencias regionales. Pero, más allá de las potencias mundiales y las potencias medias que se encuentran en el centro del sistema-mundial, y las potencias regionales que se ubican en la semiperiferia, ¿es posible hablar de potencias que se encuentren en la periferia? Como se trata de Estados periféricos, ¿pueden ser calificados como “potencias”? ¿En qué radicaría su relevancia y envergadura? Dichas “potencias” ¿pueden ser agrupadas en una nueva categoría? De ser así ¿qué características compartirían? El objetivo de este documento es proponer una nueva  categoría de potencias en el sistema internacional: las potencias subregionales.

Vlotter Leren Lezen door Professionalisering van Leraren: Effecten op Leesonderwijs

`

Het Effect van de Kanker Nazorg Wijzer* op Werkgerelateerde Problematiek en Kwaliteit van Leven bij Werkende Ex-Kankerpatiënten

Doordat kanker vaker in een vroeg stadium wordt ontdekt en de behandelingen effectiever zijn, is de kans om te overleven toegenomen. Om ex-kankerpatiënten te kunnen begeleiden na hun ziekte is de Kanker Nazorg Wijzer (KNW) ontwikkeld: een online interventie voor ex-kankerpatiënten ter ondersteuning van ervaren problemen op diverse gebieden waaronder werkhervatting. De KNW bestaat uit modules met informatie, advies, training en feedback-op-maat voor die betreffende probleemgebieden. In het huidige onderzoek stond het effect van de KNW op werkgerelateerde problematiek bij werkende ex-kankerpatiënten centraal en werd ook het effect op kwaliteit van leven gemeten. Verwacht werd dat na zes maanden gebruik van de KNW het aantal werkzame uren (werkhervatting), de werktevredenheid en kwaliteit van leven bij de gebruikers (interventiegroep) meer is toegenomen dan bij de niet-gebruikers (controlegroep) en dat de problemen op het werk en de onvervulde behoefte aan werkgerelateerde informatie meer is afgenomen. Additief werd verondersteld dat, binnen de interventiegroep, de respondenten die specifiek de werkmodule hadden gebruikt een groter verschil laten zien tussen de voor- en nameting met betrekking tot de werkgerelateerde problematiek. Op basis van voorgaand onderzoek zijn sekse, leeftijd, opleiding en actieve coping meegenomen als confounders evenals de voormetingscores van de afhankelijke variabelen. Het betreft een gerandomiseerd experiment naar de effecten van de KNW. Respondenten zijn geworven bij 22 Nederlandse ziekenhuizen en werden random toegewezen aan de interventiegroep of controlegroep. Voor de effectmeting is alleen de data van werkende ex-kankerpatiënten gebruikt. Effecten werden getoetst met multiple regressie analyses waarbij werd gecorrigeerd voor de genoemde confouders. In de interventiegroep (N = 245) waren 156 werkende ex-kankerpatiënten (85.3% vrouw, leeftijd M = 50.7) en in de controlegroep (N = 236) waren dit er 134 (85.1% vrouw, leeftijd M = 51.2). De MRA gaf na correctie van de voormetingscores en confounders aan dat het gebruik van de KNW zorgde voor een significante verbetering van kwaliteit van leven op de subschalen fysiek functioneren (p = 0.005), emotioneel functioneren (p = 0.026), sociaal functioneren (p = 0.002) en vermoeidheid (p = 0.021). De MRA gaf geen significant effect van het gebruik van de KNW op de werkgerelateerde problematiek. Additief gaf een vergelijking binnen de interventiegroep tussen de gebruikers van de werkmodule (N = 25) en de niet gebruikers (N = 131) aan dat het aantal gewerkte uren significant meer was toegenomen onder de gebruikers (t (68) = 1.680, p = 0.049).