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Jeremy Pickett-Heaps
เข้าร่วมเมื่อ 28 พ.ค. 2012
Birds and Bugs
Volvox carterii
These beautiful colonies of VOLVOX are hollow spheres of tiny
flagellated cells that can collectively swim. How they got this way is
fascinating:
They evolved from a common green alga, CHLAMYDOMONAS, which also forms
a hollow ball of cells during cell division. In the ancestral colonies,
all had their flagella on the inside where they would be no use for
swimming; this didn't matter as the balls of cells broke up, enabling
the cells to swim off.
VOLVOX inherited this mode of division - with the flagella on the
inside where they were of no use for swimming. The cells now had to
stick together to form the colony. Since the flagella were useless, ,
the colony evolved a mechanism to enable propulsion.
It's remarkable ability to turn itself out is known as INVERSION
flagellated cells that can collectively swim. How they got this way is
fascinating:
They evolved from a common green alga, CHLAMYDOMONAS, which also forms
a hollow ball of cells during cell division. In the ancestral colonies,
all had their flagella on the inside where they would be no use for
swimming; this didn't matter as the balls of cells broke up, enabling
the cells to swim off.
VOLVOX inherited this mode of division - with the flagella on the
inside where they were of no use for swimming. The cells now had to
stick together to form the colony. Since the flagella were useless, ,
the colony evolved a mechanism to enable propulsion.
It's remarkable ability to turn itself out is known as INVERSION
มุมมอง: 33 306
วีดีโอ
Euglenoid Flagellates
มุมมอง 35K10 ปีที่แล้ว
These cells have really got the wobbles, a characteristic way of moving that is like no other. Most species have very stretchy walls; a few are rigid and there may be hundreds of species, found most commonly in smelly water. Their slimy texture keeps them from drying out.
Hidden Worlds: POND LIFE
มุมมอง 2.7K11 ปีที่แล้ว
This segment from an ABC 7:30 report screened in 1990 features work carried out in the lab of Dr. Jeremy Pickett-Heaps, then a professor of the School of Botany at The University of Melbourne, with colleagues Dr. Rick Wetherbee and Dr. Tim Spurck.
Dictyostelium - a Cellular Slime Mold
มุมมอง 207K11 ปีที่แล้ว
These may look like amoebae BUT THEY'RE NOT! When they run out of food, the individuals come together to form a big slimy slug, 2 mm long. Watch it happen. There's always a straggler or two...
Rainbow Lorikeets
มุมมอง 1.5K11 ปีที่แล้ว
Colorful Australian parrots inspecting a nesting hollow. Although these two look like an agreeable pair, Rainbow Lorikeets are the thugs of the parrot family.
Bush Stone-Curlew
มุมมอง 7K11 ปีที่แล้ว
The normally shy pair, nesting alongside a surburban Brisbane driveway, put on quite a show for us.
Spurwing Plovers at their Nest
มุมมอง 27K12 ปีที่แล้ว
Nesting on the ground is a risky business. A newly-hatched chick, one hour old, staggers after its absent mother who is on patrol and calls when danger threatens.
Spurwinged Plover hatching chicks
มุมมอง 1.4K12 ปีที่แล้ว
This baby Spurwinged Plover chick has just hatched and is being gathered under the mother's wing for safety and warmth.
Superb Lyrebird
มุมมอง 36212 ปีที่แล้ว
This male lyrebird is singing and imitating other bush birds and singing
Grey Fantail
มุมมอง 33512 ปีที่แล้ว
This grey fantail is building its nest. See how it carries cobwebs about.
Then the spores erupt from the fruiting body and assemble into a mint condition 1966 Ford Galaxy 500. Na. But seriously, this is bananas!
Amazing🤩
I miss Jeremy.
finally found the one nostalgic video i watched as a kid
😅😅😅😅well information good show you 😅
Bonne chance pour EPOA
How long do eggs take to hatch?
We need a 1 or 2 hour documentary on these birds
These are in the jibjabs. How do we keel them?
Sarracenia Purpurea Sarracenia Purpurea contains hydrolytic enzymes that digest parasitic plasmodium within the human body.
Superb
i love this, thank you
Please indicate if this is real-time or if this is sped-up footage.
Best sir
Amoeba is a description, rather than a strict classification. According to Dawkins, cellular slime molds are an amoebozoan. Since dictyostelium exhibits classic amoeba activities during part of it's lifecycle, it can fairly said to be an amoeba.
I've never known that anything like this exists, but here I am questioning what evolutionary path led them down this road
If you get digging into these, they get more and more interesting. They do a form of farming, where they bring some of their uneaten food with them to "plant" in a new environment. When they're all together in the "worm", they develop a sort of primitive immune system which shares some similarities with part of our immune system. It's truly fascinating stuff.
That are so cute. You got a support from me 🥰🥰
Thank you for the extraordinary video. Reading about it doesn’t come close to watching this phenomenon.
Looks like my honeymoon
Wow, this is wonderful footage of Dictyostelium :) I'm currently working on a video on amoebas mysef and would like to use a few clips from this video. Do I have your permission? Or would you tell me the source of this footage?
This really helps in imagining while studying
So beautiful.
Very well narrated and filmed, some nice microscopy going on!
These things are totally amazing
ending on a suspenseful note
We're got 4eggs in our backyard.. Of
How would it react in a human body if they could adapt to the body?
They would eat the body.
Awesome video to those who were struggling to understand this concept.
Beautiful,😍
Excelente documentación sobre la multiplicación del orgasmo y absolutamente hermoso. Mil gracias :)
I had to watch this for my biology class! That's the comment
That is super cool
It's the Thing Dude
cool but it'd be nice if i could see what's fucking happening at all
LocoRoсo:)
Watching in 2020 😅😜
Ахиреть...
кто с твитта...
Is this not proof of group selection?
Vengo x el profe Jesús
As a biologist, I love using this example to explain evolution from single cells to multicellular organisms. There might be other models, but this is so visual and fascinating. Thank you for uploading, slime mold is amazing.
siphonophores also come to mind... very interesting creatures. xD
these little dudes are actually so cute and they're super interesting to learn about
We have 4 baby eggs but we and thay hatcht and we can not find them
Were do thay go
At 0:55, "Humans have ten trillion, trillion cells." That's not true. A human has maybe ten trillion cells. A trillion humans, collectively, would have ten trillion, trillion cells.
At 1:07, was that having rabid sex, rabbit sex, or rapid sex? Or gravid sex?
what's that itch in the back of your neck?
Fascinating but - no front intended - I really feel disgusted...
anyone know what the chiks eat ?? they die here alot i want to know what they eat to bring them to my house and care of them .....They make a nest over the houses When the eggs hatch the little chicks fall from the roof of the houses, either they die or the cats eat them. I tried to help by making a wall around the nest, but somehow they escaped from it.
They eat worms. It’s their favourite thing to eat. I’ve seen baby plovers get huge worms and just gobble them up. I work in civil construction and when we do any digging they come to get the worms. They have learned our hi viz clothing means they will get more worms and so they are never aggressive to us. I’m pretty sure they recognise faces too as when there are strangers about they go into protective mode.
Ahhhhhhhhh. I should stop googling stuff! Why do I keep reading? Then why did I look for video confirmation? 😱🤪🤪🤪
i found a lot of eggs in centennial park