Connect with us

Science

VIDEO: Why Nova Scotia health officials are testing for COVID-19 in a community that's largely been spared from the virus – TheChronicleHerald.ca

Published

 on


Over the weekend of Jan. 16-17, people in the Bridgewater, N.S. area were offered rapid COVID-19 testing for the first time since the province introduced the process last fall.

In the video above, Dr. John Ross speaks to SaltWire’s Sheldon MacLeod about why Nova Scotia health officials are looking for the virus in a community that has been mostly free of infections, even during the height of the outbreaks in the province.

This weekend, people in the Bridgewater area were offered Rapid COVID-19 testing for the first time since the province introduced the process last fall. Dr. John Ross explains why are they looking for the virus in a community that has been mostly free of infections, even during the height of the outbreaks in Nova Scotia. - Sheldon MacLeod
This weekend, people in the Bridgewater area were offered Rapid COVID-19 testing for the first time since the province introduced the process last fall. Dr. John Ross explains why are they looking for the virus in a community that has been mostly free of infections, even during the height of the outbreaks in Nova Scotia. – Sheldon MacLeod
- Sheldon MacLeod
– Sheldon MacLeod
- Sheldon MacLeod
– Sheldon MacLeod

RELATED:

Let’s block ads! (Why?)



Source link

Continue Reading

Science

Painstaking study of 'Little Foot' fossil sheds light on human origins – National Post

Published

 on


Article content

Sophisticated scanning technology is revealing intriguing secrets about Little Foot, the remarkable fossil of an early human forerunner that inhabited South Africa 3.67 million years ago during a critical juncture in our evolutionary history.

Scientists said on Tuesday they examined key parts of the nearly complete and well-preserved fossil at Britain’s national synchrotron facility, Diamond Light Source. The scanning focused upon Little Foot’s cranial vault – the upper part of her braincase – and her lower jaw, or mandible.

The researchers gained insight not only into the biology of Little Foot’s species but also into the hardships that this individual, an adult female, encountered during her life.

Little Foot’s species blended ape-like and human-like traits and is considered a possible direct ancestor of humans. University of the Witwatersrand paleoanthropologist Ron Clarke, who unearthed the fossil in the 1990s in the Sterkfontein Caves northwest of Johannesburg and is a co-author of the new study, has identified the species as Australopithecus prometheus.

“In the cranial vault, we could identify the vascular canals in the spongious bone that are probably involved in brain thermoregulation – how the brain cools down,” said University of Cambridge paleoanthropologist Amélie Beaudet, who led the study published in the journal e-Life.

Advertisement

Story continues below

This advertisement has not loaded yet, but your article continues below.

Article content

“This is very interesting as we did not have much information about that system,” Beaudet added, noting that it likely played a key role in the threefold brain size increase from Australopithecus to modern humans.

Little Foot’s teeth also were revealing.

“The dental tissues are really well preserved. She was relatively old since her teeth are quite worn,” Beaudet said, though Little Foot’s precise age has not yet been determined.

The researchers spotted defects in the tooth enamel indicative of two childhood bouts of physiological stress such as disease or malnutrition.

“There is still a lot to learn about early hominin biology,” said study co-author Thomas Connolley, principal beamline scientist at Diamond, using a term encompassing modern humans and certain extinct members of the human evolutionary lineage. “Synchrotron X-ray imaging enables examination of fossil specimens in a similar way to a hospital X-ray CT-scan of a patient, but in much greater detail.”

Little Foot, whose moniker reflects the small foot bones that were among the first elements of the skeleton found, stood roughly 4-foot-3-inches (130 cm) tall. Little Foot has been compared in importance to the fossil called Lucy that is about 3.2 million years old and less complete.

Both are species of the genus Australopithecus but possessed different biological traits, just as modern humans and Neanderthals are species of the same genus – Homo – but had different characteristics. Lucy’s species is called Australopithecus afarensis.

Advertisement

Story continues below

This advertisement has not loaded yet, but your article continues below.

Article content

“Australopithecus could be the direct ancestor of Homo – humans – and we really need to learn more about the different species of Australopithecus to be able to decide which one would be the best candidate to be our direct ancestor,” Beaudet said.

Our own species, Homo sapiens, first appeared roughly 300,000 years ago.

The synchrotron findings build on previous research on Little Foot.

The species was able to walk fully upright, but had traits suggesting it also still climbed trees, perhaps sleeping there to avoid large predators. It had gorilla-like facial features and powerful hands for climbing. Its legs were longer than its arms, as in modern humans, making this the most-ancient hominin definitively known to have that trait.

“All previous Australopithecus skeletal remains have been partial and fragmentary,” Clarke said.

(Reporting by Will Dunham in Washington, Editing by Rosalba O’Brien)

Comments

Postmedia is committed to maintaining a lively but civil forum for discussion and encourage all readers to share their views on our articles. Comments may take up to an hour for moderation before appearing on the site. We ask you to keep your comments relevant and respectful. We have enabled email notifications—you will now receive an email if you receive a reply to your comment, there is an update to a comment thread you follow or if a user you follow comments. Visit our Community Guidelines for more information and details on how to adjust your email settings.

Let’s block ads! (Why?)



Source link

Continue Reading

Science

Painstaking study of 'Little Foot' fossil sheds light on human origins – The Telegram

Published

 on


By Will Dunham

(Reuters) – Sophisticated scanning technology is revealing intriguing secrets about Little Foot, the remarkable fossil of an early human forerunner that inhabited South Africa 3.67 million years ago during a critical juncture in our evolutionary history.

Scientists said on Tuesday they examined key parts of the nearly complete and well-preserved fossil at Britain’s national synchrotron facility, Diamond Light Source. The scanning focused upon Little Foot’s cranial vault – the upper part of her braincase – and her lower jaw, or mandible.

The researchers gained insight not only into the biology of Little Foot’s species but also into the hardships that this individual, an adult female, encountered during her life.

Little Foot’s species blended ape-like and human-like traits and is considered a possible direct ancestor of humans. University of the Witwatersrand paleoanthropologist Ron Clarke, who unearthed the fossil in the 1990s in the Sterkfontein Caves northwest of Johannesburg and is a co-author of the new study, has identified the species as Australopithecus prometheus.

“In the cranial vault, we could identify the vascular canals in the spongious bone that are probably involved in brain thermoregulation – how the brain cools down,” said University of Cambridge paleoanthropologist Amélie Beaudet, who led the study published in the journal e-Life.

“This is very interesting as we did not have much information about that system,” Beaudet added, noting that it likely played a key role in the threefold brain size increase from Australopithecus to modern humans.

Little Foot’s teeth also were revealing.

“The dental tissues are really well preserved. She was relatively old since her teeth are quite worn,” Beaudet said, though Little Foot’s precise age has not yet been determined.

The researchers spotted defects in the tooth enamel indicative of two childhood bouts of physiological stress such as disease or malnutrition.

“There is still a lot to learn about early hominin biology,” said study co-author Thomas Connolley, principal beamline scientist at Diamond, using a term encompassing modern humans and certain extinct members of the human evolutionary lineage. “Synchrotron X-ray imaging enables examination of fossil specimens in a similar way to a hospital X-ray CT-scan of a patient, but in much greater detail.”

Little Foot, whose moniker reflects the small foot bones that were among the first elements of the skeleton found, stood roughly 4-foot-3-inches (130 cm) tall. Little Foot has been compared in importance to the fossil called Lucy that is about 3.2 million years old and less complete.

Both are species of the genus Australopithecus but possessed different biological traits, just as modern humans and Neanderthals are species of the same genus – Homo – but had different characteristics. Lucy’s species is called Australopithecus afarensis.

“Australopithecus could be the direct ancestor of Homo – humans – and we really need to learn more about the different species of Australopithecus to be able to decide which one would be the best candidate to be our direct ancestor,” Beaudet said.

Our own species, Homo sapiens, first appeared roughly 300,000 years ago.

The synchrotron findings build on previous research on Little Foot.

The species was able to walk fully upright, but had traits suggesting it also still climbed trees, perhaps sleeping there to avoid large predators. It had gorilla-like facial features and powerful hands for climbing. Its legs were longer than its arms, as in modern humans, making this the most-ancient hominin definitively known to have that trait.

“All previous Australopithecus skeletal remains have been partial and fragmentary,” Clarke said.

(Reporting by Will Dunham in Washington, Editing by Rosalba O’Brien)

Let’s block ads! (Why?)



Source link

Continue Reading

Science

Boeing Starliner test flight postponed – FRANCE 24

Published

 on


Issued on: 02/03/2021 – 02:28Modified: 02/03/2021 – 02:26

Advertising

Washington (AFP)

An unmanned test mission of Boeing’s Starliner space capsule, which is eventually to transport astronauts to the International Space Station, has had to be postponed, NASA said Monday.

The test, which had previously been postponed until early April, will suffer another delay, this time due to unprecedented cold temperatures in Texas that caused extensive power outages in the southern US state.

“We did lose time with the weather in Houston. We lost about a week of time,” said Steve Stich, the manager of NASA’s Commercial Crew Program, during a press conference.

NASA is “continuing to evaluate options” for the new test date.

The Starliner’s first crewed flight is currently scheduled for September, Stich added.

During an initial test flight in December 2019, the Starliner capsule failed to dock at the ISS and returned to Earth prematurely — a setback for aerospace giant Boeing.

Since then, its program has fallen far behind SpaceX, the other company — owned by Tesla CEO Elon Musk — chosen by NASA to develop a vessel to transport astronauts to the ISS.

SpaceX’s Crew Dragon capsule already carried astronauts to the station in June and November 2020. Four other astronauts, including Frenchman Thomas Pesquet, will return to the ISS in April.

Let’s block ads! (Why?)



Source link

Continue Reading

Trending