University of Lausanne

About: University of Lausanne is a education organization based out in Lausanne, Switzerland. It is known for research contribution in the topics: Population & Medicine. The organization has 20508 authors who have published 46458 publications receiving 1996655 citations. The organization is also known as: Université de Lausanne & UNIL.

A Whole-Genome Association Study of Major Determinants for Host Control of HIV-1

Abstract: Understanding why some people establish and maintain effective control of HIV-1 and others do not is a priority in the effort to develop new treatments for HIV/AIDS. Using a whole-genome association strategy, we identified polymorphisms that explain nearly 15% of the variation among individuals in viral load during the asymptomatic set-point period of infection. One of these is found within an endogenous retroviral element and is associated with major histocompatibility allele human leukocyte antigen (HLA)-B*5701, whereas a second is located near the HLA-C gene. An additional analysis of the time to HIV disease progression implicated two genes, one of which encodes an RNA polymerase I subunit. These findings emphasize the importance of studying human genetic variation as a guide to combating infectious agents.

Differential Gene Expression in Response to Mechanical Wounding and Insect Feeding in Arabidopsis

Abstract: Wounding in multicellular eukaryotes results in marked changes in gene expression that contribute to tissue defense and repair. Using a cDNA microarray technique, we analyzed the timing, dynamics, and regulation of the expression of 150 genes in mechanically wounded leaves of Arabidopsis. Temporal accumulation of a group of transcripts was correlated with the appearance of oxylipin signals of the jasmonate family. Analysis of the coronatine-insensitive coi1-1 Arabidopsis mutant that is also insensitive to jasmonate allowed us to identify a large number of COI1-dependent and COI1-independent wound-inducible genes. Water stress was found to contribute to the regulation of an unexpectedly large fraction of these genes. Comparing the results of mechanical wounding with damage by feeding larvae of the cabbage butterfly (Pieris rapae) resulted in very different transcript profiles. One gene was specifically induced by insect feeding but not by wounding; moreover, there was a relative lack of water stress-induced gene expression during insect feeding. These results help reveal a feeding strategy of P. rapae that may minimize the activation of a subset of water stress-inducible, defense-related genes.

Toward a political conception of corporate responsibility: Business and society seen from a habermasian perspective

Abstract: We review two important schools within business and society research, which we label positivist and postpositivist corporate social responsibility (CSR). The former is criticized because of its instrumentalism and normative vacuity and the latter because of its relativism, foundationalism, and utopianism. We propose a new approach, based on Jurgen Habermas's theory of democracy, and we define the new role of the business firm as a political actor in a globalizing society.

Effectiveness of brief alcohol interventions in primary care populations

Abstract: Excessive drinking contributes significantly to social problems, physical and psychological illness, injury and death Hidden effects include increased levels of violence, accidents and suicide Most alcohol-related harm is caused by excessive drinkers whose consumption exceeds recommended drinking levels, not the drinkers with severe alcohol dependency problems One way to reduce consumption levels in a community may be to provide a brief intervention in primary care over one to four sessions This is provided by healthcare workers such as general physicians, nurses or psychologists In general practice, patients are routinely asked about alcohol consumption during registration, general health checks and as part of health screening (using a questionnaire) They tend not to be seeking help for alcohol problems when presenting The intervention they are offered includes feedback on alcohol use and harms, identification of high risk situations for drinking and coping strategies, increased motivation and the development of a personal plan to reduce drinking It takes place within the time-frame of a standard consultation, 5 to 15 minutes for a general physician, longer for a nurseA total of 29 controlled trials from various countries were identified, in general practice (24 trials) or an emergency setting (five trials) Participants drank an average of 306 grams of alcohol (over 30 standard drinks) per week on entry to the trial Over 7000 participants with a mean age of 43 years were randomised to receive a brief intervention or a control intervention, including assessment only After one year or more, people who received the brief intervention drank less alcohol than people in the control group (average difference 38 grams/week, range 23 to 54 grams) For men (some 70% of participants), the benefit of brief intervention was a difference of 57 grams/week, range 25 to 89 grams (six trials) The benefit was not clear for women The benefits of brief intervention were similar in the normal clinical setting and in research settings with greater resources Longer counselling had little additional benefit

Mycorrhizal ecology and evolution: the past, the present, and the future

Abstract: Almost all land plants form symbiotic associations with mycorrhizal fungi. These below-ground fungi play a key role in terrestrial ecosystems as they regulate nutrient and carbon cycles, and influence soil structure and ecosystem multifunctionality. Up to 80% of plant N and P is provided by mycorrhizal fungi and many plant species depend on these symbionts for growth and survival. Estimates suggest that there are c. 50 000 fungal species that form mycorrhizal associations with c. 250 000 plant species. The development of high-throughput molecular tools has helped us to better understand the biology, evolution, and biodiversity of mycorrhizal associations. Nuclear genome assemblies and gene annotations of 33 mycorrhizal fungal species are now available providing fascinating opportunities to deepen our understanding of the mycorrhizal lifestyle, the metabolic capabilities of these plant symbionts, the molecular dialogue between symbionts, and evolutionary adaptations across a range of mycorrhizal associations. Large-scale molecular surveys have provided novel insights into the diversity, spatial and temporal dynamics of mycorrhizal fungal communities. At the ecological level, network theory makes it possible to analyze interactions between plant-fungal partners as complex underground multi-species networks. Our analysis suggests that nestedness, modularity and specificity of mycorrhizal networks vary and depend on mycorrhizal type. Mechanistic models explaining partner choice, resource exchange, and coevolution in mycorrhizal associations have been developed and are being tested. This review ends with major frontiers for further research.