Jan-Maarten
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jan-maarten.bsky.social
Jan-Maarten
@jan-maarten.bsky.social
56 followers 79 following 63 posts
Bio-entertainment
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jan-maarten.bsky.social
Important 'save the date' announcement! Biohackery fun in Greece April 22-25
November 20, 2025 at 2:26 PM
jan-maarten.bsky.social
Ik heb gestemd, voor een duurzame, rechtvaardige samenleving
Red dot
October 29, 2025 at 2:14 PM
jan-maarten.bsky.social
Weather stations up & running! The Smart Citizen kit (open source), an Ecowitt station, and 3 different Nutshell eDNA samplers for testing
October 13, 2025 at 2:04 PM
jan-maarten.bsky.social
@atinygreencell.bsky.social , turns out I am growing a Korean perilla (Perilla frutescens) that is doing a consistent triple whorl, spontaneously. Happy to ship a sample, once shipping between our countries is a go again
Korean perilla seedling with triple whorls instead of double ones. Happy little monster
October 1, 2025 at 1:20 PM
jan-maarten.bsky.social
Aasvlieg en steenhommel-komkommerkruid brunch. Green bluebottle fly and stone bumblebee feeding on borage.
Metallic green bluebottle fly perched on the edge of a leaf. Hair metal. Stone bumblebee feeding on borage. It is hanging upside down from the blue-pink flower, which is pointed downwards
August 31, 2025 at 6:01 PM
jan-maarten.bsky.social
Nothing but some critters goin about their business
Close up of a spider in a slightly tattered web, drinking from their juice box Close up of a fly on a leaf seen from the side. Big brown-red eye and pearly wings. Alert but still. Fly on a flower bud in close up. The background is all blurry bc the zoom lens you need to get this close.
August 30, 2025 at 4:38 PM
jan-maarten.bsky.social
DNAir sampler works in simulation too! Downward vertical air movement is color coded red. github.com/J4n-M44rt3n/...
August 20, 2025 at 10:47 AM
jan-maarten.bsky.social
Meijendel hike
Trees in the dunes, looking like shadowplay figures Trees in the dunes, looking like shadowplay figures Trees in the dunes, looking like shadowplay figures
August 19, 2025 at 8:35 PM
jan-maarten.bsky.social
Sarah and I went to see the launch of this year's strandbeest, at Scheveningen beach
Walking towards the launch of a new strandbeest, at a sunny slightly windy day at Scheveningen beach. Lots of people arounf, all taking photos with their phones Theo Janssen in a dark purple shirt and a tan cowboy-type hat guiding his strandbeest, with people, beach, and sea in the background Close up of the strandbeast sails with blue sky in the background. The light plays beautifully in the white sails Ongoing strandbeest launch as seen from the dunes. It all seems so small from afar
August 19, 2025 at 8:33 PM
jan-maarten.bsky.social
Purple glow on a windowsill, I outfitted plant hatchery boxes with led strips today
Two small plant incubators in a windowsill, uv leds give a purple glow to the surroundings
August 4, 2025 at 8:27 PM
jan-maarten.bsky.social
Testing a new windtunnel build; vacuum cleaner universal motor, custom fan, zipties. Up to 4 m/s and counting.
Windtunnel on shelf, vacuum cleaner motor mounted with zipties on 3D printed pedestal, fan in large pvc tube (30 cm diameter) Windtunnel, view from the other end, fan in the distance
July 28, 2025 at 8:19 PM
jan-maarten.bsky.social
Bumlebee on lavender, even closer but shakier too
July 27, 2025 at 8:28 PM
jan-maarten.bsky.social
More bumblebee on lavender
July 27, 2025 at 8:28 PM
jan-maarten.bsky.social
Bumblebee on lavender
July 27, 2025 at 8:27 PM
jan-maarten.bsky.social
Squid fishin' fleet, Les, Bali
Spider-like, hand built Balinese fishing vessels out on the ocean on a bright, slightly cloudy day Spider-like, hand built Balinese fishing vessels out on the ocean on a bright, slightly cloudy day Spider-like, hand built Balinese fishing vessels out on the ocean on a bright, slightly cloudy day
July 5, 2025 at 3:35 AM
jan-maarten.bsky.social
Een Seek thermal compact pro voor je smartphone met zelfgemaakte toevoegingen om macro opnames te kunnen maken
July 1, 2025 at 1:44 PM
jan-maarten.bsky.social
Rhinoceros beetle on our porch last night
June 30, 2025 at 2:12 PM
jan-maarten.bsky.social
Aardhommel, boomhommel, rozenkever, gele lis met kleine vriendjes
Aardhommel op gele lis Boomhommel op leeuwenbek Johanneskever op gele lis Gele lis met kleine vriendjes
June 4, 2025 at 6:09 PM
jan-maarten.bsky.social
Foraging bumble bee, look at those flight muscles!
May 26, 2025 at 8:24 PM
jan-maarten.bsky.social
Does nature observe city limits? Why no, it does not. Menno Schilthuizen´s ´the urban naturalist´ is full of fascinating stories of life adapting to the urban environment and the people studying it.
Book cover of Menno Schilthuizen's 'the urban naturalist'. It shows stylized, colorful outlies of urban plants and animals and the tools to study them.
May 9, 2025 at 9:19 AM
jan-maarten.bsky.social
Second electroplating experiment, for an anode for what will be an ion-plasma wind tunnel. Electroplating is fun and easy, I can live with that!
Electroplating setup, blue liquid in a plastic box with electrical contacts hung in them. An example of an electroplated ring is hold up in front of the camera. 3D printed design for the frame for an ion-plasma wind tunnel. Looks a bit retro sci-fi, with three concentric funnels connected to a short open cylinder.
February 11, 2025 at 6:23 PM
jan-maarten.bsky.social
Bio comunity lab extraordinaire Hackuarium celebrates their 10th anniversary this weekend! Join on video here -> epfl.zoom.us/j/61330371040 ; Program here -> wiki.hackuarium.ch/images/9/9e/...
Stylized purple octopus with safety goggles, this is the logo of Hackuarium Biolab in Ecublens Switzerland
October 12, 2024 at 10:43 AM
jan-maarten.bsky.social
Hollyhocks at night
Pink hollyhock flowers at night, translucent and shot from the back
July 12, 2024 at 7:32 PM
jan-maarten.bsky.social
Today in the garden, kind of hard to see, parasitic wasp wrestling down a spider
Close up of a parasitic wasp wrestling down a spider in the grass
June 7, 2024 at 5:51 PM
jan-maarten.bsky.social
I agree, aphids are gorge ;-) Still going to nudge them down a little in the interest of a balanced backyard ecosystem
Close up of black aphids with white stripes (zebra aphids?) on an elderberry stem in my backyard.
May 20, 2024 at 1:32 PM