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A board for scientific/technological discussion and the distribution of knowledge!


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Yellow crazy ant genes are like nothing we’ve ever seen before Anonymous 06/10/2023 (Sat) 22:54 [Preview] No. 2 [Reply] [Last 50 Posts]
Named for the erratic movements they make when disturbed, these aggressive insects spray acid at their prey, targeting their eyes, legs and mouth in order to paralyse them. In great numbers, they swarm their helpless victims, tearing them limb from limb.

The wanton destruction of the yellow crazy ant (Anoplolepis gracilipes) has wreaked ecological havoc in places such as Gove Peninsula, in the north-eastern corner of Arnhem Land, and Christmas Island, famous for the annual mass migration of red crabs . It’s estimated that the accidental introduction of yellow crazy ants to Christmas Island in the 20th century has wiped out about 10–15 million (or as much as one-third of the entire population) red crabs (Gecarcoidea natalis).

What’s remarkable about the yellow crazy ant is the fact that, similar to the chaos that defines how they overwhelm and kill their prey, there’s a kind of chaos that’s playing out inside of them. Scientists have released the results of an investigation into the species’ genomes, and describe them as unlike anything they’ve seen in another animal.

As this paper published in Science describes, male yellow crazy ants are known as chimaeras, which means they contain two different sets of DNA, or “two warring cell lineages with two entirely different sets of genomes”, as Nature describes it. So, instead of all of their cells containing the same genes, as is the case with humans and other species, in yellow crazy ants, some cells carry only maternal genetic material, and others only carry paternal genetic material.

Not only is this the first time that such a phenomenon has been identified in a living creature, but scientists are unsure as to why it’s occurred at all. “It’s a piece of biology that’s unparalleled as far as we know,” biologist Daniel Kronauer, who was not involved in the study, told Nature.

Who would have thought such bizarre genetics are playing out inside such a tiny creature.

Strange genetics aside, it’s not okay what yellow crazy ants are doing to red crabs, so there are efforts to curb their destructive activity.

https://www.australiangeographic.com.au/blogs/creatura-blog/2023/06/yellow-crazy-ant-genes-are-like-nothing-weve-ever-seen-before/


Anonymous 08/14/2023 (Mon) 05:48 [Preview] No.37 del
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>>2
>male yellow crazy ants are known as chimaeras, which means they contain two different sets of DNA, or “two warring cell lineages with two entirely different sets of genomes”



NASA rover Perseverance finds strange rock on Mars that appears hollow with a hole in its center Anonymous 06/28/2023 (Wed) 23:01 [Preview] No. 23 [Reply] [Last 50 Posts]


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Anonymous 07/18/2023 (Tue) 05:23 [Preview] No.25 del
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Samples from the asteroid Ryugu collected by the Hayabusa2 mission contain nitrogenous organic compounds, including uracil and niacin.

https://www.global.hokudai.ac.jp/blog/uracil-found-in-ryugu-samples/


Anonymous 08/13/2023 (Sun) 09:18 [Preview] No.35 del
>>23
Как у него вертолет летает, там ведь давление как на Земле на высоте 35 км, а на такой высоте вертолеты не летают?


Anonymous 08/13/2023 (Sun) 23:34 [Preview] No.36 del
>>35
Так там гравитация меньше в три раза.



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A free-swimming medusa from the Cambrian Burgess Shale! Anonymous 08/07/2023 (Mon) 02:41 [Preview] No. 34 [Reply] [Last 50 Posts]
Here we describe Burgessomedusa phasmiformis gen. et sp. nov., the oldest unequivocal macroscopic free-swimming medusa in the fossil record. Our study is based on 182 exceptionally preserved body fossils from the middle Cambrian Burgess Shale (Raymond Quarry, British Columbia, Canada). Burgessomedusa possesses a cuboidal umbrella up to 20 cm high and over 90 short, finger-like tentacles. Phylogenetic analysis supports a medusozoan affinity, most likely as a stem group to Cubozoa or Acraspeda (a group including Staurozoa, Cubozoa and Scyphozoa). Burgessomedusa demonstrates an ancient origin for the free-swimming medusa life stage and supports a growing number of studies showing an early evolutionary diversification of Medusozoa, including of the crown group, during the late Precambrian–Cambrian transition.

https://royalsocietypublishing.org/doi/10.1098/rspb.2022.2490



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A Space Shuttle on the Streets of Los Angeles Anonymous 08/05/2023 (Sat) 05:03 [Preview] No. 31 [Reply] [Last 50 Posts]
The space shuttle Endeavour is on its last mission today, a 12-mile creep through Los Angeles city streets on a 160-wheeled carrier. It is passing through neighborhoods and strip malls, headed toward its final destination, the California Science Center in South Los Angeles. At times, the shuttle has barely cleared trees, houses and and street signs along a course heavily prepared for the trip. The move will cost an estimated $10 million, according to the Exposition Park museum. Gathered here are a few images of Endeavour's last journey.
https://www.theatlantic.com/photo/2012/10/a-space-shuttle-on-the-streets-of-los-angeles/100386/


Anonymous 08/05/2023 (Sat) 05:04 [Preview] No.32 del
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Pioneer 10 Anonymous 08/05/2023 (Sat) 02:56 [Preview] No. 30 [Reply] [Last 50 Posts]
Pioneer 10 — космический зонд НАСА массой 258 кг.

Пионер-10 стал первым космическим аппаратом улетевший дальше Марса, первым прошедшим через пояс астероидов, первым совершившим пролёт вблизи Юпитера и сфотографировавшим планету, первым аппаратом развившим третью космической скорость, первым использующим радиоизотопный термоэлектрический генератор,

Запущен 3 марта 1972 ракетой Атлас-Центавр.
15 июля 1972 вошел в пояс астероидов.
4 декабря 1973 года пролетел на расстоянии 132 тыс. км от облаков Юпитера.
В феврале 1976 года аппарат пересёк орбиту Сатурна.
13 июня 1983 года пересек орбиту Нептуна.

Последний контакт с Пионером-10 состоялся 22—23 января 2003 года. В это время космический аппарат находился на расстоянии 82,19 а. е. от Солнца и удалялся от него с относительной скоростью 12,224 км/c.

Дальнейшая судьба «Пионера-10» неизвестна, но предполагается, что он продолжает полёт и со временем покинет Солнечную систему, направляясь в сторону звезды Альдебаран.



Anonymous 07/31/2023 (Mon) 07:39 [Preview] No. 29 [Reply] [Last 50 Posts]
I am an Anzu and I eat a balanced diet of plants, insects and ….. children!

Anzu was an oviraptorosaur and would have been a danger to young T rex before they had even left the egg. This dinosaur is hypothesized to be an omnivore and I can definitely see it eating a T rex egg or scooping up an unsuspecting hatchling.

Besides Anzu young T rex would also fear predators like Archeroraptor, Pectodon and possibly Struthiomimus.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3960162/



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Anonymous 06/27/2023 (Tue) 07:32 [Preview] No. 19 [Reply] [Last 50 Posts]
Grumman TBM Avenger
First flight 7 August 1941


Anonymous Admin 06/27/2023 (Tue) 12:38 [Preview] No.20 del
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Hah, those radial engines! I love these fatsos.


Anonymous Admin 06/27/2023 (Tue) 12:40 [Preview] No.21 del
I should stop shitposting when logged in.


Anonymous 06/28/2023 (Wed) 04:40 [Preview] No.22 del
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Скока надо тока чтобы панувати на Марсе Anonymous 06/26/2023 (Mon) 05:40 [Preview] No. 17 [Reply] [Last 50 Posts]
Соберу в одном месте прикидки расчетов затрат электроэнергии

РАСХОД ЭЛЕКТРОЭНЕРГИИ НА ЭЛЕКТРОЛИЗ ВОДЫ

1 моль молекулярного водорода весит - 2 грамма
1 моль метана весит - 16 грамм
1 моль ЛЮБОГО газа при нормальных условиях занимает объем 22,4 литра.

Реакция
CO2+4H2->CH4+2H2O

На получение 1 моль метана израсходуется 4 моль молекулярного водорода.
На заправку ракеты надо 240 тонн метана или 15 миллионов моль метана (240000000/16) для получения которых надо 60 миллионов моль молекулярного водорода (1 344 000 м3 водорода - 60000000*0.0224).
Для получения 1 м3 молекулярного водорода из воды путем электролиза надо 4 кВт-ч.
Для получения 1 344 000 м3 молекулярного водорода из воды путем электролиза надо 5,376 ГВт-ч.

РАСХОД ЭЛЕКТРОЭНЕРГИИ НА СЖИЖЕНИЯ КИСЛОРОДА

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Anonymous 06/26/2023 (Mon) 05:46 [Preview] No.18 del
Расчет по картофану

Растения должны быть изолированы от атмосферы и от потока протонов и ядер гелия солнечного ветра. Иначе им пиздец придет. Так что растить можно только в закрытых парниках под защитой слоя грунта и искусственном освещении.

Солнечная постоянная на орбите Марса 0,58 КВт/м2. На поверхности поток солнечного ниже, часть его поглощается и рассеивается в атмосфере. КПД солнечных панелей MER обеспечивал им 0,1 КВт/м2 днем.

Для вегетации нужен свет длиной волны 450-650 нм. Светодиодная лента с красными и синими светодиодами вполне покрывает этот диапазон.
Требуемая для картофеля освещенность 10 000 лк
Средняя урожайность картофана 100 ц/га (консервативно).
Следовательно для 1 т картофана нужна площадь 0,1 га или 1000 м2. Т.е. нужен световой поток 10 000 x 1000 = 10 000 000 люмен
Световая эффективность у светодиодов в среднем 100 Лм/Вт
10 000 000 / 100 = 100 000 Вт.

100 кВт электроэнергии для освещения которые обеспечат 100x0,1 = 1000 м2 солнечных панелей.

С обогревом сложнее, потеря тепла будет идти не только через теплопроводность грунта но и через излучение, все зависит от того как и чем будем теплоизолировать пол, потолок и стены помещения и кпд светодиодов.

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Anonymous 06/19/2023 (Mon) 04:19 [Preview] No. 14 [Reply] [Last 50 Posts]
What's the science or algorythm to those 6 digit likes/sales social media post, content, illustrations?

Like waht are the criteria that makes them so?
maybe a line of algorythm so i can tell what i need to do to max up my post reach and such


Nordidyou Anonymous 06/19/2023 (Mon) 10:16 [Preview] No.15 del
Bump


Anonymous 06/20/2023 (Tue) 09:43 [Preview] No.16 del
Bump