Controlling colloidal phase transitions with critical Casimir forces

The critical Casimir effect provides a thermodynamic analogue of the well-known quantum mechanical Casimir effect. It acts between two surfaces immersed in a critical binary liquid mixture, and results from the confinement of concentration fluctuations of the solvent. Unlike the quantum mechanical effect, the magnitude and range of this attraction can be adjusted with temperature via the solvent correlation length, thus offering new opportunities for the assembly of nano and micron-scale structures. Here, we demonstrate the active assembly control of equilibrium phases using critical Casimir forces. We guide colloidal particles into analogues of molecular liquid and solid phases via exquisite control over their interactions. By measuring the critical Casimir particle pair potential directly from density fluctuations in the colloidal gas, we obtain insight into liquefaction at small scales: We apply the Van der Waals model of molecular liquefaction and show that the colloidal gas-liquid condensation is accurately described by the Van der Waals theory, even on the scale of a few particles. These results open up new possibilities in the active assembly control of micro and nanostructures

David Bond and Jean Picard : Two pivotal breeders of faba bean in the 20th century

David Bond and Jean Picard, two leaders of European legume breeding, died within a few months of each other. On the basis of their agronomic and genetic training, they both met the challenge of breeding faba bean, a protein-rich species that had received little attention from breeders before the 1950s (Picard, 1953; Bond 1957). Both made great strides at modernizing their chosen crop by developing and applying new ideas and techniques, as well as generating new methods and genetic materials.Peer reviewe

Evaluation of Winter protein pea cultivars in the conditions of Serbia

There is a widespread opinion that the development of winter cultivars of protein pea could significantly increase its cultivation area, especially in the temperate regions. A small-plot trial was carried out on a chernozem soil at the Experiment Field of the Institute of Field and Vegetable Crops at Rimski Šančevi, including six French and three Bulgarian winter protein pea cultivars. The cultivar 5105 had the earliest date of beginning of flowering (April 16) and the earliest date of harvest (June 11). The cultivars Dove and 5105 had the highest winter survival coefficients, with 0.93 each in the year of 2004/05 and 0.92 each in the year of 2005/06. In average, the highest grain yield was in the cultivars 5174 (6567 kg ha-1) and Dove (6453 kg ha-1) while the lowest grain yield was in the cultivar Frilene (1062 kg ha-1)

An Italian functional genomic resource for Medicago truncatula

Background: Medicago truncatula is a model species for legumes. Its functional genomics have been considerably boosted in recent years due to initiatives based both in Europe and US. Collections of mutants are becoming increasingly available and this will help unravel the genetic control of important traits for many species of legumes. Findings: Our report is on the production of three complementary mutant collections of the model species Medicago truncatula produced in Italy in the frame of a national genomic initiative. Well established strategies were used: Tnt1 mutagenesis, TILLING and activation tagging. Both forward and reverse genetics screenings proved the efficiency of the mutagenesis approaches adopted, enabling the isolation of interesting mutants which are in course of characterization. We anticipate that the reported collections will be complementary to the recently established functional genomics tools developed for Medicago truncatula both in Europe and in the United States

Pulses for Sustainability: Breaking Agriculture and Food Sectors Out of Lock-In

Crop diversification can improve the sustainability of Western agriculture. In particular, pulses are crops that can help both agriculture and the food industry become more ecological, as they reduce greenhouse gas emissions and help reduce animal-based consumption. Today, however, the development of these crops in Europe has been hindered due to lock-in, since major crops have been co-developed to a greater extent in farming and food systems. After briefly reviewing the major mechanisms that lead to this lock-in, this article adopts a co-evolution framework to address the interconnected transition of agriculture and food systems. We explore how current societal trends in the agrifood system offer new opportunities for pulses, and how simultaneous changes both in production and consumption can facilitate this dual transition. Drawing on insights from the literature and interviews with stakeholders in France—taken here as examples—we argue that to develop pulses, strong support is required from public institutions to coordinate and guide the multiple actors involved in the same direction

Breeding for intercropping: join applied genetics and agronomy for improved annual legume production

Archaeology offers evidence that growing plants together, with annual legumes as usually inevitable component, could be the most ancient cropping system in all primeval agricultural centres. With a ten millennia long tradition, intercropping annual legumes, usually with cereals and for diverse uses, has remained important all over the world until today. There is a phenomenon that brings together legume breeders and agronomists: both are aware that there are differences in the agronomic performance of the mixtures of annual legumes and other field crops if diverse annual legume cultivars are used. Wishing to understand this phenomenon properly and define its economic significance, we are establishing a firm interaction between breeders and agronomists, in order to design such annual legume ideotypes that would have the best agronomic performance when intercropped with diverse plants for either forage or grain or biomass or any other use. Our major hypotheses are that the ideotypes for intercropping are the genotypes being the most competitive in the same environment compartments or taking profit of the complementary compartments

Socializing One Health: an innovative strategy to investigate social and behavioral risks of emerging viral threats

In an effort to strengthen global capacity to prevent, detect, and control infectious diseases in animals and people, the United States Agency for International Development’s (USAID) Emerging Pandemic Threats (EPT) PREDICT project funded development of regional, national, and local One Health capacities for early disease detection, rapid response, disease control, and risk reduction. From the outset, the EPT approach was inclusive of social science research methods designed to understand the contexts and behaviors of communities living and working at human-animal-environment interfaces considered high-risk for virus emergence. Using qualitative and quantitative approaches, PREDICT behavioral research aimed to identify and assess a range of socio-cultural behaviors that could be influential in zoonotic disease emergence, amplification, and transmission. This broad approach to behavioral risk characterization enabled us to identify and characterize human activities that could be linked to the transmission dynamics of new and emerging viruses. This paper provides a discussion of implementation of a social science approach within a zoonotic surveillance framework. We conducted in-depth ethnographic interviews and focus groups to better understand the individual- and community-level knowledge, attitudes, and practices that potentially put participants at risk for zoonotic disease transmission from the animals they live and work with, across 6 interface domains. When we asked highly-exposed individuals (ie. bushmeat hunters, wildlife or guano farmers) about the risk they perceived in their occupational activities, most did not perceive it to be risky, whether because it was normalized by years (or generations) of doing such an activity, or due to lack of information about potential risks. Integrating the social sciences allows investigations of the specific human activities that are hypothesized to drive disease emergence, amplification, and transmission, in order to better substantiate behavioral disease drivers, along with the social dimensions of infection and transmission dynamics. Understanding these dynamics is critical to achieving health security--the protection from threats to health-- which requires investments in both collective and individual health security. Involving behavioral sciences into zoonotic disease surveillance allowed us to push toward fuller community integration and engagement and toward dialogue and implementation of recommendations for disease prevention and improved health security

Climate change-induced economic impacts on tourism destinations: The case of Australia

Although the economic impacts of climate change have been analysed in Australia at the national level, impacts of climate change via tourism activities have been overlooked. It is likely that the induced economic impact through tourism activities is much more than realised, particularly at the regional/destination level. This paper examines the economic flow-on effects of climate change on five selected Australian tourism destinations. While the flow-on effect of impacts on these five destinations is relatively insignificant at the national level, at the regional level the impacts can be very considerable, and those impacts vary widely between regions. In addition to general direct climate change impacts on the economies of these regions, the larger their tourism share, the severer the flow-on economic impacts involved. The paper raises concerns for policymakers that measuring economic impacts of climate change without considering its flow-on effect through tourism activities will significantly underestimate the total impact of climate change for destination regions. Further, when all tourism destinations are taken into account, the flow-on economic impact of climate change could be significant for the Australian economy as a whole. Analyses such as those reported here could form a basis for scenario examination for policy development. © 2010 Taylor & Franci