Steve Calver, account manager at HB Ingredients, says that single-origin couverture remains a niche market because of its price and limited production (Chocolaterie Robert for instance produces 280 tonnes of cocoa and Claudio Corallo in São Tomé and Príncipe just 20 tonnes).
Realize that "single-origin" coffee is blended, using beans from the same country, whereas "unblended coffee" is from beans from one source.
In this paper, we look at the geographic and genetic evidence that supports a single origin of domesticated rice and discuss the evolutionary process of hybridisation introgression that may reconcile the apparently conflicting data related to the origin of domesticated rice in Asia.
If a large number of foreign genes that have a single origin are involved, an endosymbiotic gene transfer (EGT) is often the favoured hypothesis.
Importantly, it has been widely accepted that the single origin of GapC1 genes is compatible with the monophyly of chromalveolates (e.g. [9], [10]).
In this regard, it has been proposed that a single origin of venom in Squamata, the order of reptiles including lizards and snakes, dates back roughly 200 Mya to the Late Triassic/Early Jurassic period [ 1, 2, 93].
"The problem with single origin is that most people can't remember the origins right," Menkes said.
Evidence now firmly supports that mitochondria have a single origin; they arised from a eubacterial symbiont whose closest contemporary relatives are found within the alpha-proteobacteria [ 8, 55].
We speculate that the mosaic nature of the Sulfolobus chromosome has arisen by integration of extrachromosomal elements into an ancestral chromosome that presumably contained a single origin of replication.
The exclusively right-hand twist is one of the central pieces of evidence that indicates a single origin of all life on Earth.
This assumption was based on the presence of geographic barriers between various caves (e.g., mountainous areas between the Micos and El Abra regions) that renders a single origin unlikely [ 5, 7, 42].
