The Antares programme uses permanent deep-sea seismic sensors to monitor local and global earthquakes, improving risk assessment systems and studying submarine activity. The project overcomes challenges of instrument resistance and coherence between equipment and electronic systems.
Satellite images help model sediment transport in New Caledonia's southwest lagoon, providing a three-dimensional picture of the process. The combined use of remote sensing and numerical models refines predictions of erosion rates and improves precision.
A recent study challenges traditional theory that El Niño-La Niña cycles affect sardine and anchovy populations differently. Researchers found that sardines can thrive in warm waters during El Niño events, while anchovies adapt to cold conditions by extending their reproduction periods.
The study reveals that the informal sector creates most jobs in West African cities, but these occupations are insecure and poorly paid. Underemployment affects 67% of active people, with nearly 2.7 million individuals in this situation.
Researchers found that 12.9% of wild chimpanzees carry Ebola virus antibodies, indicating regular contact with the animal reservoir and non-fatal infections. Dogs also carry the virus, with high antibody prevalence near epidemic foci, suggesting they could become a potential source of infection for humans.
Research links seasonal climate variations to meningitis outbreaks in Sahelo-Sudanian Africa. The study suggests that Harmattan winds drive the transmission of meningococcus bacteria, leading to epidemic cycles.
A study in Senegal found that migrants' social context influences their sexual behavior and risk of HIV transmission. In rural areas, strict social control and religion may encourage migrants to adopt safer sex practices upon return. The study suggests that migration is not a major contributor to HIV spread in Senegal.
Researchers have discovered new alkaloids with antiparasitic properties, which showed efficacy in treating visceral leishmaniasis. These quinoline compounds also exhibited activity against HIV-1 and HTLV-1 retroviruses, offering potential for new treatments.
A clinical trial in Cameroon shows a generic fixed-dose antiretroviral tritherapy to be as effective as conventional therapies, with good patient compliance and high quality of the treatment. The treatment, which costs $20 per month, is well tolerated and provides a cost-effective solution for HIV treatment in developing countries.
A giant fossil coral found in Vanuatu provides evidence of the Younger Dryas period's significant cooling event, which affected the tropics. The coral's growth rate and chemical composition reveal that sea surface temperatures were on average 4.5°C lower than present during this time.
The Ebola virus has unleashed several lethal epidemics in Central Africa, leading to haemorrhagic fever and high mortality rates. The virus is transmitted by direct contact with infected animals or their carcasses, resulting in a rapid decline in great ape populations.
Researchers found that nutrient-poor ocean areas have 'hot spots' of high chlorophyll concentrations, likely due to concentrated floating organic particles. This phenomenon improves our understanding of marine ecosystem processes and has significant applications for fishing and tuna stock management.
A recent study published in Nature announces a major advance in the study of Amazon Basin's hydrology and geochemistry dynamics. The research partnership has yielded precise measurements of water, sediment, and geochemical inputs contributed by the Amazon's main tributaries.
A Franco-Senegalese research team has demonstrated the efficacy of antiretroviral therapy in Africa, contrary to previous doubts. The 18-month pilot scheme showed strong adherence and high patient respect for prescriptions, with improved treatment outcomes.
Researchers have discovered that phytochromes regulate the synthesis of bacterial photosynthetic apparatus, essential for symbiotic relationships with leguminous plants. The discovery provides new insights into the operational mechanisms of light sensors in plants and has potential applications in molecular biology.
A study found that nearly 800 monkeys in Cameroon were infected with simian immunodeficiency viruses, highlighting the risk of human exposure through hunting and handling primates. The diversity among the viruses suggests a high degree of human exposure to SIVs.
A study of coral records from the South-West Pacific reveals that El Niño's behavior remained consistent during the Little Ice Age, with no impact on its strength or frequency. The research suggests that massive corals can provide valuable insights into past climatic phenomena.
The LIFOU 2000 survey discovered nearly 3000 species of mollusc living in a mere 5000 ha area on Lifou, outperforming the entire Mediterranean region. This staggering diversity includes many rare and unknown species, with some seen only once or represented by single examples.
Researchers found that soil geology plays a significant role in the Congo River Basin's response to drought. The basin's varied geology, including ferruginous cuirassed peneplain, sandy soils, and porous aquifers, affects discharge reduction rates during droughts.
Researchers found that moderately intense disturbances contribute to high tree species diversity in tropical rain forests. The study challenges previous findings, which suggested no effect of disturbance on diversity, and instead supports the intermediate disturbance hypothesis. The presence of heliophilous trees indicates recent canop...