Publications by authors named "A C Granjon"
Strontium isotope (Sr/Sr) analysis with reference to strontium isotope landscapes (Sr isoscapes) allows reconstructing mobility and migration in archaeology, ecology, and forensics. However, despite the vast potential of research involving Sr/Sr analysis particularly in Africa, Sr isoscapes remain unavailable for the largest parts of the continent. Here, we measure the Sr/Sr ratios in 778 environmental samples from 24 African countries and combine this data with published data to model a bioavailable Sr isoscape for sub-Saharan Africa using random forest regression.
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- Scientists study how animals change to survive in different places, which is really important for understanding biology.
- They looked at chimpanzees, our closest relatives, who live in many types of environments like rainforests and savannahs.
- By examining genetic information from wild chimpanzees, they discovered that some chimps have adapted to fight off malaria in similar ways to humans, showing how important genetic diversity is for endangered animals.
Article Synopsis
- This study provides the first comprehensive catalog of chimpanzee genetic diversity using non-invasive samples collected from 48 sites in Africa, focusing on chromosome 21.
- The research reveals clear genetic differences among the four recognized chimpanzee subspecies and indicates unexpected local genetic exchanges, while also mapping patterns of population isolation, migration, and connectivity.
- Unlike humans, chimpanzees lack a history of long-distance migrations, which may affect their cultural transmission, and the study introduces a precise geolocation method for identifying the origins of confiscated chimpanzees.
Although much research has been carried out in the field of the milling of GFRP (Glass Fibre Reinforced Polymer) composites, the complexity of the process is such that it is still not mastered in many industrial cases. The current work is aimed at studying the influence of three different geometries of PCD (PolyCrystalline Diamond) and cemented tungsten carbide cutting tools during the up-milling of GFRP composites at fixed cutting conditions ( = 502 m/min and = 420 mm/min). Delamination, cutting forces and tool wear are compared at the fresh and worn states, and the correlation between the lifespan and the cost of the cutting tool is analysed.
View Article and Find Full Text PDFEcological drivers of helminth infection patterns in the Virunga Massif mountain gorilla population.
Int J Parasitol Parasites Wildl
April 2022
The Virunga Massif mountain gorilla population has been periodically monitored since the early 1970s, with gradually increasing effort. The population declined drastically in the 1970s, but the numbers stabilized in the 1980s. Since then, the population has been steadily increasing within their limited habitat fragment that is surrounded by a dense human population.
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