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Niraj Rai

@nirajrai.bsky.social

Group Head, Ancient DNA and Population Genomics Lab, BSIP, Lucknow, India.

6 Posts96 Follower178 Folgt
Niklas Hausmann@niklashausmann.bsky.social · 5d ago

The largest, sub-annual temperature dataset from archaeological mollusc shells yet. Over 120 records provided a seasonal assessment of the climatic conditions around the 8.2k event on a scale directly relevant to human behaviour. 🏺🧪🐚 #OpenAccess @leizarchaeology.bsky.social doi.org/10.1073/pnas...

On-site, subannual climate records decouple Neolithic expansion from climate instability | PNAS

How the life of prehistoric people was influenced by climate change and extreme events often remains elusive. Finding appropriate spatiotemporal sc...

doi.org

Shreya Ramachandran@srama.bsky.social · 3mo ago

🤝🏽 We are so grateful to every community member who partnered with us. We returned to all participant communities to thank donors in person & share results! Paper: www.tandfonline.com/doi/full/10.... Press release: biologicalsciences.uchicago.edu/news/gut-mic... Happy to answer questions!

Distinct trajectories of urbanization shape the human gut microbiome across South Asia

Human gut microbiomes respond to lifestyle transitions, yet the extent to which these responses are conserved across spatio-cultural contexts remains undercharacterized. We present the South Asian ...

tandfonline.com

Shreya Ramachandran@srama.bsky.social · 3mo ago

🥛 Some communities like the Spitians have eaten wheat & dairy for generations, but others only recently added them after urbanizing—we can see this in their Bifidobacterium. 🩺 Controlling for community, urban folks show lower diversity & more Megamonas, which has been linked to obesity risk.

Shreya Ramachandran@srama.bsky.social · 3mo ago

Some key takeaways: 🌏 SAMBAR microbiomes are distinct globally, but there's no single "South Asian microbiome." Culturally-specific diets matter! 🫘 The Pochury Naga eat Axone, a fermented soybean condiment—and we detect much more Bacillus in their gut microbiomes than the rest of the cohort.

Shreya Ramachandran@srama.bsky.social · 3mo ago

Urbanization & lifestyle transition affect gut microbiomes worldwide, but South Asia has been left out of the conversation. We worked with 10 diverse communities to see how their microbiomes reflect local diets and dietary shifts. We call our dataset the South Asian MicroBiome ARRay, or SAMBAR 🍛

Shreya Ramachandran@srama.bsky.social · 3mo ago

🎉 New paper just dropped! So excited to share the first paper from my PhD work, with Nagarjuna Pasupuleti, Niraj Rai, Maanasa Raghavan & our incredible team of collaborators across India and Sri Lanka! 🧵below on what we found studying South Asian gut microbiomes:

Tom Higham@tommyhigham.bsky.social · 9mo ago

My dad and I published this paper this week in Archaeometry. It shows how you can avoid old wood effects when dating charcoal by using a bespoke Bayesian outlier model developed by my friends Mike Dee and Chris Ramsey a few years ago. We applied it to a Thai site. doi.org/10.1111/arcm.70105

Dealing With Inbuilt Age: A Bayesian Approach to Radiocarbon Dating of Rice, Bamboo and Charcoal From Non Ban Jak, Thailand

New radiocarbon determinations from rice grains and bamboo have been obtained from Non Ban Jak, Northeast Thailand. These, along with charcoal, date a late Iron Age building sequence. The results com...

doi.org

Marta Mirazon Lahr@martamlahr.bsky.social · last yr.

Like you, I've read so many nice things about Jane Goodall's amazing life and legacy today, but this video of the realease of the chimp called Wounda is beyond words ♥️ If only we could find the will to stop destroying the extraordinary natural world around us... youtu.be/ClOMa_GufsA?...

Wounda's Journey - Jane Goodall Witnesses Release of Chimpanzee Into New Island Sanctuary Site

YouTube video by Dr. Jane Goodall & the Jane Goodall Institute USA

youtu.be

Niraj Rai@nirajrai.bsky.social · last yr.

Happy to share our new research article on demographic and migratory history of Sri Lanka. This is one of the detailed genetic studies ever done on Sri Lankan population www.cell.com/current-biol...

Population histories of the Indigenous Adivasi and Sinhalese from Sri Lanka using whole genomes

Sri Lanka is home to diverse ethnic groups with different genetic histories. Urban Aragon et al. find that despite close genetic affinities, Indigenous Adivasi have more hunter-gatherer ancestry and l...

cell.com