CHIZU — the atlas of coffee research
Coffee research in Germany
Two limits come with this count. Only 100,474 of the 190,643 searchable papers (52.7%) carry an author affiliation country. The other 90,169 (47.3%) carry none. So these 3,185 papers are 3,185 out of the 100,474 whose affiliation is known. And a co-authored paper is counted once for every country its authors sit in. Per-country counts therefore do not add up to the whole.
Germany does not grow coffee, but coffee is researched there.
Check it yourself
This is not our word for it. You can run the same query against the same index.
When they were written
1868–2026
Years before 1600 are treated as unknown. The upstream data (OpenAlex) sometimes writes 1400 when the year is missing, and that is a placeholder, not a measurement.
Where they appeared
Top 8 sources (journals and repositories)
Most cited
10 papers, most cited first
- Reach and grasp by people with tetraplegia using a neurally controlled robotic arm2012cited 2,750open access
- Biochemistry of Plant Volatiles2004cited 1,105open access
- Recovering Accurate 3D Human Pose in the Wild Using IMUs and a Moving Camera2018cited 1,071
- Characterisation of nanoplastics during the degradation of polystyrene2015cited 1,047open access
- Why do we respond so differently? Reviewing determinants of human salivary cortisol responses to challenge2008cited 957
- Fruit set of highland coffee increases with the diversity of pollinating bees2003cited 859open access
- Supercritical fluids: technology and application to food processing2004cited 822open access
- The potential effects of chlorogenic acid, the main phenolic components in coffee, on health: a comprehensive review of the literature2017cited 801
- Multifunctional shade-tree management in tropical agroforestry landscapes - a review2011cited 801open access
- The coffee genome provides insight into the convergent evolution of caffeine biosynthesis2014cited 666open access
Which stage of coffee
Only 30.2% of the whole index carries a stage label. Of this country's 3,185 papers, 1,188 carry one. The breakdown below is about those 1,188 papers only — the rest were never candidates for it.
One paper can carry several labels, so the breakdown adds up to more than that number.
Which field
Only 75.9% of the whole index carries a field label. Of this country's 3,185 papers, 2,395 carry one. The breakdown below is about those 2,395 papers only — the rest were never candidates for it.
One paper can carry several labels, so the breakdown adds up to more than that number.
What language
"undetermined" means the upstream record carried no language. We did not guess one.
Knowledge is not evenly spread
Counting only papers whose author affiliation is known, the largest is Indonesia with 22,248. Germany has 3,185 — a factor of 7.
That gap does not follow where coffee is grown. Research gathers where the means to do research are, not where the coffee is. Making that visible is why CHIZU exists.
Other countries
Indonesia 22,248United States 17,988Brazil 10,857United Kingdom 5,569China 4,887India 3,542Italy 3,111France 3,072Japan 2,822Colombia 2,489Spain 2,363Canada 2,352