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Marieke van Ham

@hammarieke.bsky.social
107 followers 56 following 45 posts

B cell immunologist focussing on antibody formation and pandemics research, Sanquin Blood Supply and SILS, Faculty of Science, University of Amsterdam, the Netherlands. My texts are on personal title, but data-based.

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Reposted by Marieke van Ham
Taylor Mitchell Brown @tmitchellbrown.bsky.social · 29/09/2026
New research finds the Suriname toad’s strange star-shaped fingertips are a kind of tactile eyeball that allow them to ‘see’ their prey. The toes detect subtle vibrations in the water and translate them into details about size and speed. #ToadToesTuesday 🧪🧪 New at @science.org
science.org
These frogs ‘see’ prey with their star-shaped toes
Fingertips of Suriname toads are hypersensitive motion detectors, new study reveals
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Reposted by Marieke van Ham
European Centre for Disease Prevention and Control @ecdc.europa.eu · 26/09/2026
Vaccination information should speak your language. 🌍 For #EuropeanDayofLanguages, explore the European Vaccination Information Portal: clear, evidence-based information on vaccines and vaccination in all 26 EU/EEA languages. ➡️ vaccination-info.europa.eu #EVIP #UnitedInProtection
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Reposted by Marieke van Ham
Andrew Curry @andrewcurry.com · 23/09/2026
10,000-year-old #GobekliTepe has it all: Massive stone pillars, elaborate carved reliefs and hundreds of fragmented human bones. Now @dai-weltweit.bsky.social researchers have uncovered burials, too – and they point to a new, natural explanation for the scattered remains at the site. @science.org
science.org
Bones link 10,000-year-old temple complex to a village, not a ‘skull cult’
Landslides, not rituals, may have scattered skulls and bones at Turkey’s famed Göbekli Tepe site
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Immunity @cp-immunity.bsky.social · 23/09/2026
Online now: Germinal center interleukin-4 microniches drive tissue divergence of IgE memory B cell responses
dlvr.it
Germinal center interleukin-4 microniches drive tissue divergence of IgE memory B cell responses
IgE recall responses sustain allergic disease, but their anatomical regulation remains poorly understood. Villazala-Merino et al. identify Tfh cell-derived IL-4 microniches within germinal centers as an anatomical checkpoint that favors IgE recall responses in lymphoid organs while limiting their generation in the lung mucosa.
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Jona Lendering @jonalendering.bsky.social · 23/09/2026
Een scherf uit de omgeving van Krefeld toont dat ook in onze contreien Aramees werd geschreven. Met advies voor een student die een nuttige scriptie wil schrijven. mainzerbeobachter.com/2026/09/23/e...
mainzerbeobachter.com
Een bijzondere scherf - Mainzer Beobachter
Een scherf, gevonden in de omgeving van Krefeld, heeft een Aramese inscriptie en documenteert de meertaligheid van het Romeinse Rijk.
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CIDRAP @cidrap.bsky.social · 21/09/2026
Ervebo vaccine trial kicks off in Ebola-ravaged DRC The vaccine targets Zaire strain of Ebola, but many hope there will be cross-protection against the Bundibugyo strain. Read more: bit.ly/46BhSJm 📷: NIAID/Filckr cc
Gloved hand giving a vaccine
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Nature @nature.com · 19/09/2026
Researchers have observed how neuronal circuits in the human brain resolve such a dilemma in real time, revealing a ‘tug of war’ between rival neuronal groups go.nature.com/4iUv2Zt
go.nature.com
Take a risk or play it safe? Neuronal tug-of-war helps the brain decide
Nature - Using a video game involving bombs and treasure chests, researchers show how neural activity flickers between two regions of the frontal cortex when the brain weighs up a tricky decision.
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Nature @nature.com · 19/09/2026
Asgard archaea, named for the realm of the Norse gods, changed scientists' views on the origins of eukaryotes go.nature.com/4j9qxtQ
go.nature.com
These bizarre, much-coveted microbes are revealing the origins of complex life
Nature - Researchers are racing to culture a menagerie of exotic organisms and finding lots of surprises along the way.
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Christina Larson @christina-larson.bsky.social · 17/09/2026
I’m excited to share my latest story for @science.org—on fossil discoveries in south China that offer new clues about mysterious ancient human ancestors. I’ve visited this karst region of Yunnan a few times, where ancient humans hunted water buffalo 150,000 years ago www.science.org/content/arti...
science.org
Denisovans were strong and agile hunters, fossil elbow and primitive tools suggest
The first arm bone fragment from these mysterious human relatives was found near cutting instruments and animal remains in southwestern China
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CIDRAP @cidrap.bsky.social · 16/09/2026
Few people with the flu isolate for the recommended period Some people might shed the most influenza virus RNA just as their symptoms start to improve and they return to ordinary life. Read more: bit.ly/4rg4JyE
Close up of person's hands holding a cup of tea. Person is wearing a bathrobe.
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Jona Lendering @jonalendering.bsky.social · 17/09/2026
Vandaag een blogje over tandheelkunde in het oude Nabije Oosten met, naar ons idee, een succes en een mislukking. mainzerbeobachter.com/2026/09/17/a...
mainzerbeobachter.com
Antieke tandheelkunde - Mainzer Beobachter
De tandheelkunde is zo oud als de mensheid. De Feniciërs maakten al tandprotheses en de Assyriërs konden een ontsteking genezen.
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Jona Lendering @jonalendering.bsky.social · 16/09/2026
Een blogje over de grote rivieren in de Oudheid. Met een verzoek een petitie te tekenen voor het behoud van de publieke taken van het Nationaal Archief. mainzerbeobachter.com/2026/09/16/v...
mainzerbeobachter.com
Voor-westerse geschiedenis (14) de rivieren - Mainzer Beobachter
In de reeks over de voor-westerse geschiedenis behandel ik vandaag de rivieren: handig voor irrigatie maar vooral transportader.
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Marieke van Ham @hammarieke.bsky.social · 14/09/2026
Beautiful Bulgaria.
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Jona Lendering @jonalendering.bsky.social · 11/09/2026
Waarom spreken de mensen in Oost-Europa eigenlijk Slavische talen? Deel één van een reeks van vier. Ik beweer niet dat ik het volledig heb doorgrond, maar wilde het toch eens uitzoeken. mainzerbeobachter.com/2026/09/11/d...
mainzerbeobachter.com
De Slavische volken (1) Inleiding - Mainzer Beobachter
Waar komen de sprekers van de Slavische talen, zoals Russisch en Pools en Bulgaars, vandaan? Als u dacht dat de vraag naar de herkomst van de Germaanssprekenden lastig te beantwoorden was, met bronnen...
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Science Magazine @science.org · 11/09/2026
Gondwana may be getting a promotion. Long overshadowed by Pangaea—the supercontinent it would later help form—Gondwana may itself have been a full-fledged supercontinent, according to a new study. Learn more: scim.ag/4xijMcC
Pangaea’s ‘little brother’ may finally qualify as a supercontinent
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Jona Lendering @jonalendering.bsky.social · 09/09/2026
Waarom de gemeente Winterswijk een standbeeld moet oprichten voor Veleda, een van de grootste vrouwen uit de Nederlandse geschiedenis. mainzerbeobachter.com/2026/09/09/v...
mainzerbeobachter.com
Veleda - Mainzer Beobachter
"Veleda" was de naam of titel van een Bructerische profetes die een rol speelde in de Bataafse Opstand tegen de Romeinen.
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Nature @nature.com · 07/09/2026
Just two doses of psilocybin administered before chemotherapy completely prevented mice from developing neuropathy go.nature.com/3Vg19sq
go.nature.com
Magic-mushroom compound blocks a severe side effect of chemotherapy, in mice
Study shows that psilocybin acts on nerves to prevent the painful condition called peripheral neuropathy.
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Jona Lendering @jonalendering.bsky.social · 05/09/2026
De wauw van de week: onderzoekers gebruiken middeleeuws perkament om het DNA te bemachtigen waarmee ze de ontwikkeling van een virus door de eeuwen heen in kaart kunnen brengen. www.science.org/doi/10.1126/...
science.org
Three thousand five hundred years of sheeppox virus evolution inferred from archaeological and codicological genomes
Sheeppox virus (SPPV) is a major livestock pathogen causing economic hardship through reduced production and death of vulnerable sheep, with written descriptions of sheeppox-like disease recorded sinc...
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Nature @nature.com · 02/09/2026
Nature research paper: Amphibious stem-insect sheds light on colonization of land go.nature.com/4iwiXsU
go.nature.com
Amphibious stem-insect sheds light on colonization of land - Nature
Restudy of a challenging fossil using cross-polarized light imaging and phylogenetic reconstruction identifies Chosha praecursor, a probable early-diverging insect, helping to bridge the longstanding ‘hexapod gap’ in the fossil record.
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bioRxiv Immunology @biorxiv-immuno.bsky.social · 31/08/2026
Cellular inhibitor of apoptosis protein (cIAP) is a convergent hub that couples BCR-CD40 signal dynamics to B cell fate www.biorxiv.org/content/10.64898/20…
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Gavi @gavi.org · 29/08/2026
"Please don't kiss the baby." It’s one of the most difficult requests for new parents to make of visiting friends and family. But for newborns that one boundary can help protect them from the very real risk of serious infections with life-long complications. What you need to know: bit.ly/4wqmixP
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Science Magazine @science.org · 27/08/2026
Carnivorous sundew plants know they’ve trapped their dinner thanks to glutathione. Learn more in #ScienceAdvances: scim.ag/4zCCvSF
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Nature @nature.com · 26/08/2026
The US FDA have now approved this drug for use against a cancer previously thought to be "undruggable" go.nature.com/4wUDwmu
go.nature.com
Landmark cancer trial shows success against ‘undruggable’ cancer — raising hopes for future treatments
Unprecedented results against a stubbornly hard-to-treat cancer are boosting optimism that other challenging tumours will be next.
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Marieke van Ham @hammarieke.bsky.social · 23/08/2026
Maybe read this. It gave me a nudge in my implicit assumptions. Positive and good to realise. True communities of different people with shared responsibilities and room for the voice of each can work.
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bioRxiv Immunology @biorxiv-immuno.bsky.social · 23/08/2026
Longitudinal analysis of the B-cell receptor repertoire across 30 years of ageing www.biorxiv.org/content/10.64898/20…
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Nature @nature.com · 22/08/2026
Could wearable exoskeletons soon become part of everyday life? go.nature.com/4gklOnD
go.nature.com
Will you be wearing an exoskeleton in ten years? The tech that could change how we move
Nature - Robotic supports were once designed for clinical use, but researchers are now developing cheaper, smaller devices aimed at everyone — from people with ageing knees to 20-somethings seeking...
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European Centre for Disease Prevention and Control @ecdc.europa.eu · 21/08/2026
Stay protected. Check your vaccinations. Safeguard your community. 🔗 Read about vaccination against measles in YOUR language on the European Vaccination Information Portal (EVIP): bit.ly/EVIPMeasles 🔗 Latest outbreak information in our weekly CDTR: bit.ly/4zwX2rM 🧵 4/4 #VaccinesWork #EVIP
bit.ly
Measles
Key facts on measles, symptoms, complications, risk factors, how it spreads, prevention, and treatment.
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CIDRAP @cidrap.bsky.social · 20/08/2026
WHO delivers Ebola vaccine to DRC to see if it can protect against Bundibugyo strain The vaccine will be used in a phase 3 trial. Read more: bit.ly/4qpO1fW 📷: NIAID
Ebola vaccine
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Jona Lendering @jonalendering.bsky.social · 21/08/2026
Vandaag blog ik over de Romeinse provincie Moesia, zeg maar het huidige Servië en noordelijk Bulgarije. mainzerbeobachter.com/2026/08/21/m...
mainzerbeobachter.com
Moesia - Mainzer Beobachter
Europa kent al eeuwen twee grote handelsroutes. De ene was de corridor van de Noordzee via Rijn, Moezel, Saône en Rhône naar de Middellandse Zee. De andere stond daar haaks op en leidde naar het ooste...
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Cell Press @cellpress.bsky.social · 20/08/2026
Pre-vaccine sentinel antibodies predict blunted vaccine responses. Learn more in Cell Press Blue: www.cell.com/cell-press-b... Joshua LaBaer & colleagues
first page of image: "Pre-vaccine sentinel antibodies predict blunted vaccine responses."
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Taylor Mitchell Brown @tmitchellbrown.bsky.social · 20/08/2026
Newly uncovered fossil footprints from Brazil reveal what could be the largest mammal ever to walk alongside dinosaurs. The discovery suggests mammals weren’t always relegated to the shadows of their mega-sized carnivore contemporaries. #Paleontology #Ichnology 🧪🧪 New at @science.org
science.org
Footprints may reveal biggest known mammal from age of the dinosaurs
Beefy tracks point to a Cretaceous critter as big as a large dog or mountain lion
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Science Magazine @science.org · 13/08/2026
A 2025 #ScienceReview offers an overview of recent research that reveals the immune system not only defends the body but also actively shapes and supports various life-sustaining processes through dynamic, reciprocal interactions with other physiological systems. scim.ag/4zf2Q9i
scim.ag
Immune system influence on physiology
The immune system’s central function is to maintain homeostasis by guarding the organism against dangerous external and internal stressors. Immunity’s operational toolbox contains diverse processes, s...
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Eric Topol @erictopol.bsky.social · 11/08/2026
Vaccine benefit in children "Since 1974, vaccination has averted 154 million deaths, including 146 million among children younger than 5 years of whom 101 million were infants younger than 1 year." www.thelancet.com/journals/lan... The most striking benefit was for vaccination vs measles (Figure)
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Intenudas @izmarasan.bsky.social · 08/08/2026
It's interesting that Sankore Mosque in Timbuktu, one of the oldest madrasas in West Africa, was also founded by a woman according to the Timbuktu manuscripts.
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Science Magazine @science.org · 08/08/2026
The domestic cat may be a far more recent arrival to Europe than previously thought, according to a 2025 Science study. The findings offer new insight into one of humanity’s most enigmatic animal companions. scim.ag/44kov1S #InternationalCatDay
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Gavi @gavi.org · 08/08/2026
How do vaccines work? Watch this deep dive on our #VaccinesWork YouTube channel: youtu.be/5GBiaigzc5M
youtu.be
How do Vaccines Work?
When it comes to your immune system, facing a new, dangerous germ for the first time is a high-stakes emergency. Without a rehearsal, your body has to recognise the threat and craft "custom keys"…
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Gavi @gavi.org · 07/08/2026
Did you know some vaccines might also protect your brain from dementia? 🧵
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Nature @nature.com · 05/08/2026
A severe bout of COVID-19 can wake up an army of dormant viruses hiding inside the body go.nature.com/4fDUY9w
go.nature.com
COVID can wake up a slew of dormant viruses inside you
Reactivation of typically harmless anelloviruses, in particular, seems to be linked with developing long COVID, study finds.
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Science Magazine @science.org · 05/08/2026
New mineral analyses may explain the mysterious gap that was present before oxygen flooded our planet billions of years ago. scim.ag/4hQ0lUo
scim.ag
What triggered one of the most dramatic changes in Earth’s history?
New science may explain mysterious gap before oxygen flooded our planet billions of years ago
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Kai Kupferschmidt @kakape.bsky.social · 05/08/2026
“This award recognizes Ms. Branswell for her exceptional ability to clearly convey complex and often urgent science topics for the public.” They couldn’t have chosen a better person! Congrats @helenbranswell.bsky.social! “Well deserved” doesn’t begin to cover it… 🧪
businesswire.com
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Science Magazine @science.org · 05/08/2026
Scientists have created the first comprehensive map of the human vagus nerve, tracing thousands of individual nerve fibers stretching from the lower brain stem to all major organs. scim.ag/457X63m
scim.ag
Major highway of the human nervous system gets a complete road map
First comprehensive map of the vagus nerve may point to more precise stimulation therapies
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bioRxiv Immunology @biorxiv-immuno.bsky.social · 04/08/2026
Antibody feedback limits specific B-cell entry and alters germinal center repertoires by antibody-antigen complexes www.biorxiv.org/content/10.64898/20…
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Longreads @longreads.com · 04/08/2026
"Doctors took Mei for a full-body CT scan and then rushed her to the intensive care unit. Her brave face had begun to crack. 'Mom, I want to go home,' she told her mother, before vanishing into the ward." Brendan Borrell for @science.org and @retractionwatch.com: www.science.org/content/arti...
science.org
Exclusive: Death of girl in Chinese gene-editing trial was never made public
Parents want accountability after study went disastrously wrong, Science and Retraction Watch investigation reveals
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Gavi @gavi.org · 05/08/2026
In Apac, Uganda, where exposure to infectious mosquito bites is extraordinarily high, new hospital data is showing a striking shift. The story 🧵👇
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CIDRAP @cidrap.bsky.social · 04/08/2026
4 new human H9N2 avian flu cases in China as Australia sees more H5N1 in wild birds There have been 20 H9N2 human detections in the past 6 months. Read more: bit.ly/4w2UcI1
Chickens walking on a dirt road.
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WHO @who.int · 31/07/2026
It’s #WorldBreastfeedingWeek! Breastfeeding provides the perfect nutrition for babies and a healthy beginning - with benefits that last for life. From maternity leave to trained counsellors, let’s ensure every mum gets the #breastfeeding support she needs! bit.ly/4wyTpzy
Mother breastfeeding her baby surrounded by benefits like improved survival and protection from infectious diseases.
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Jona Lendering @jonalendering.bsky.social · 01/08/2026
Ik zal niet zeggen dat alles in de geschiedenis van de Romeinen en #Germanen peis en vree was. Maar niet alles is wat het lijkt. mainzerbeobachter.com/2026/08/01/d...
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Science Magazine @science.org · 30/07/2026
An analysis of fossil mammals in Science suggests that Mexico served as a long-term evolutionary “holding pen” where North American species adapted and diversified for millions of years before sweeping into South America 2.8 million years ago. scim.ag/4fu2QKL
Pie charts of taxonomic representation for all taxa sampled in each indicated geographic region and time interval during five diversification events leading up to interchange pulses.
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Kai Kupferschmidt @kakape.bsky.social · 30/07/2026
Ebola may have been spreading for months in the DRC before anyone recognized it. A new reconstruction suggests the outbreak was already widespread in the gold-mining town of Mongbwalu by January. It wasn’t officially declared until 15 May. Why did no-one raise the alarm? My story for @science.org 🧪
science.org
EXCLUSIVE: Congo’s Ebola epidemic started at least 4 months before it was detected
A remote mining town gripped by fear saw hundreds of suspected cases before the government declared an outbreak, report says
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Science Magazine @science.org · 29/07/2026
“Our hope is that the illumination of the magnificence and rich interior life and personalities of these animals is making a tiny contribution to tiger welfare and conservation.” #InternationalTigerDay scim.ag/4x4MjTp
scim.ag
Tigers have distinct personalities, according to big cat questionnaire
Findings suggest aggressive tigers may be mentally wired to fare better than their cautious counterparts
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