oleh admin | Nov 20, 2024 | archaeology, ecology, nature, paleontology, science
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80-million-year-old dinosaur eggs found in China
A 280-million-year-old hidden realm was inadvertently uncovered by a
a woman during her hike in the Italian Alps
.
When Claudia Steffensen and her spouse were hiking through the Valtellina Orobie Alps National Park in Lombardy back in 2023, she noticed a pale grey stone adorned with peculiar patterns.
As she took a closer look, she recognized that the patterns were indeed footprints of animals.
Steffensen forwarded images to a group of researchers who concluded that the tracks were from
a ancient reptilian creature that traversed the planet
During the Permian era, which came right before the time of dinosaurs.
Upon further exploration of the area, palaeontologists uncovered hundreds of additional fossilised tracks created by at least five different species of prehistoric reptiles, amphibians, and insects.
Although these creatures lived before the time of dinosaurs, some must have reached significant dimensions, possibly measuring from six to twelve feet in length, according to researchers’ statements.
The group similarly discovered impressions of plant fossils—ranging from remnants of seeds, leaves, and stems—together with marks left by raindrops and waves upon the ancient lakeshore.
Lorenzo Marchetti, a co-re searcher and specialist in trace fossils from the Museum of Natural History,
Berlin
mentioned that the prints were maintained with ‘remarkable’ clarity, including details like ‘fingernail marks and the stomach skin of certain creatures.’
The intricate details and exceptional preservation of these fossils can be attributed to their close vicinity to water, as the researchers pointed out.
The old ecosystem, which exists at elevations up to 10,000 feet and within valley floors, has been conserved in finely layered sandstone.
Palaeontologists likewise recognised claw marks and imprints from the undersides of these creatures.
“The tracks were formed when these sandstones and shales were merely wet sand and sediment along riverbanks and lake edges, where seasonal fluctuations would cause periodic drying periods,” explained co-researcher and paleontologist Ausonio Ronchi from the University of Pavia.
statement
.
Ronchi mentioned, ‘The summer sun dried out those areas, making them so hard that when fresh water returned, it didn’t wash away the footprints; instead, they were coated with a new layer of clay, providing protection.’
The Permian epoch extended from 299 million to 252 million years ago.
At this juncture, the worldwide climate swiftly heated up, culminating in a major extinction episode that signalled the close of this era and wiped out 90 percent of life forms on Earth.
Paradoxically, contemporary global warming facilitated the unveiling of this ancient alpine habitat, since the remains were concealed beneath snowpacks that have thawed due to the increased temperatures on Earth.
“The finding in the Ambria Valley can be attributed to climate change as well,” said Doriano Codega, who serves as the president of the Valtellina Orobie nature park.
The Guardian
.
The remarkable aspect was the elevation – these artifacts were discovered at considerable heights and were remarkably well-preserved. The region experiences frequent landslides, leading to rock dislodgments which unearthed these fossils.
From 1850 onwards, due to human-induced climate change, Alpine glaciers have experienced a reduction of 30 to 40 percent in surface area and about half of their total volume, with an extra loss of 10 to 20 percent occurring since 1980, as reported.
CREA Mont-Blanc: Research Centre for Alpine Environments
.
This finding provides insight into an old environment destroyed by severe global temperature increases. Consequently, it also acts as a warning about the consequences we face as human-induced heating approaches critical points.
“These fossils … provide evidence of a far-off geological era, yet they showcase a pattern of global warming that closely mirrors what we see today,” the researchers stated.
‘The past holds many lessons about the risks we face in shaping the world today.’
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oleh admin | Agu 1, 2024 | bacteria, biology, ecology, life sciences, science
Recent studies indicate that complex life on our planet started about 1.5 billion years sooner than earlier estimates suggested. Here we examine some leading hypotheses regarding the emergence of life.
For hundreds of years, humans have pondered over the beginnings of life on our planet, as well as the nature of existence itself—questioning primarily our origins and our future direction.
This query encompasses fundamental fields such as chemistry, biology, and physics, along with philosophy, psychology, and aspects of belief. Initially, early scholars were involved in various realms of inquiry. However, these foundational sciences are typically seen as more exact and straightforward to quantify compared to the others, which is why researchers often concentrate their efforts on them nowadays.
During the 19th century, French chemist Louis Pasteur showed that life invariably arises from pre-existing life. Whether they be plants, animals, or microorganisms, each reproduces within its own species.
And what about the initial living organism? If it emerged from non-living matter, when and how did this occur?
Life could potentially be far more ancient than our current understanding suggests.
A research conducted at Cardiff University in Wales, UK, indicates that complex life on our planet may have started approximately 1.5 billion years before what was initially believed. The team asserts they discovered indications within rocks from Gabon suggesting that environmental conditions were conducive to life around 2.1 billion years ago.
Published in the journal
Precambrian Research
The research indicates that approximately over 2 billion years ago, the impact of two continental plates colliding generated a nutrient-abundant setting conducive to the development of complex life forms.
This would have generated phosphorus and marine oxygen essential for the shift from unicellular organisms to more advanced forms of life.
However, their existence was brief — it seems these complex lifeforms were restricted to an inland sea and could not expand globally.
This study questions the long-held scientific agreement that complex animals first emerged 635 million years ago, proposing instead that there was an earlier unsuccessful effort towards developing intricate life forms on our planet.
What alternative theories are there regarding the emergence of life on Earth?
Certain researchers have voiced skepticism regarding the recent discoveries and have demanded additional studies.
However, this research has reignited discussions regarding how complex life originated on our planet.
Throughout the last hundred years, scientists have created several dozen.
In this section, we examine several of the most common ones.
1. The Theory of Primeval Broth
The most prevalent hypothesis is the “primordial soup” theory, suggesting that life emerged from organic molecules in an early ocean.
British biologist
Charles Darwin
(1809-1882) was the pioneer who proposed that life might have originated in “a warm little pond.”
It wasn’t until the 1950s that his hypothesis underwent experimental validation. Harold Urey, an esteemed American chemist and Nobel laureate, along with Stanley Miller, a specialist in chemical evolution, constructed a rudimentary atmospheric environment within a lab setting. Inside this sealed apparatus, they combined water, methane, ammonia, and hydrogen gases and then sparked these mixtures using electrical discharges meant to mimic lightning’s role as an energy source.
Following several days, amino acids, which are the fundamental components of life, had developed.
2. The concept of cosmic life
A fascinating idea suggests that life on Earth initially originated beyond our planet, coming from outer space. This concept proposes that living organisms or essential building blocks required for life were transported here and took root on Earth.
This train of thought does not pinpoint precisely where life began or in what shape it came to our planet. However, the predominant notion is that life might have been delivered via a meteorite bearing microorganisms that struck Earth.
The initial advocates for this hypothesis included British astrophysicists Fred Hoyle and Chandra Wickramasinghe. During the 1970s, their research indicated that comets held sufficient organic material to potentially initiate life on planets like Earth.
3. The hypothesis of hydrothermal vents
The hydrothermal vent hypothesis proposes that life on Earth might have originated at the bottom of the oceans near these hydrothermal vents. Such vents are fissures in the seafloor from which emanate heated water saturated with minerals.
Michael Russell, a British geologist associated with the NASA Astrobiology Institute, suggested that alkaline hydrothermal vents emitting hydrogen, hydrogen sulfide, and methane might have offered suitable circumstances for the creation of basic organic compounds.
Even though the surroundings of hydrothermal vents are deemed harsh—with temperatures soaring up to 400°C (752°F)—there exist microorganisms that thrive in these settings through chemosynthesis.
Chemosynthesis is a biological process where microorganisms produce their sustenance. Instead of relying on light, they utilize energy derived from chemical reactions. This capability enables them to thrive in dim environments like the deep seabed.
4. The RNA world
The RNA world hypothesis suggests that prior to the emergence of DNA and proteins, early life forms on Earth relied on an adaptable molecule known as RNA (ribonucleic acid).
DNA (deoxyribonucleic acid) enables organisms to grow, endure, and replicate. These DNA sequences transform into messages or guidelines that facilitate the creation of proteins—these intricate molecules play a crucial role in nearly all functions within our bodies—and sustain life.
On the contrary, RNA fulfills these two crucial roles for living organisms: It holds genetic data and serves as a catalyst for vital chemical processes.
During the 1980s, chemists Thomas Cech and Sidney Altman uncovered ribozymes—RNA molecules possessing catalytic capabilities—and received a Nobel Prize for their discovery.
Scientists have suggested that early RNA molecules could self-replicate and facilitate basic chemical reactions before modern life forms emerged. Over time, these were supplanted by proteins, which serve as superior catalysts.
Various hypotheses exist regarding the beginnings of life. However, these are the ones that have garnered the most focus within the scientific community.
Everyone—including the most recent findings from Cardiff University—emphasizes the intricacy of this question that still captivates and puzzles us in modern times.
Edited by: Zulfikar Abbany
Primary source:
A recent study from Cardiff University suggests that complex life on Earth emerged approximately 1.5 billion years sooner than was originally believed. This finding was announced on July 29, 2024.
https://www.cardiff.ac.uk/news/view/2830233-complex-life-on-earth-began-around-1.5-billion-years-earlier-than-previously-thought,-new-study-claims
Author: Fernando Mateos Frühbeck
oleh admin | Jun 23, 2024 | biology, culture, ecology, plants, science
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Plants possess INTELLECT and the capability to address challenges.
Scientists have noticed plants engaging with their surroundings in manners suggesting consciousness, according to some researchers’ claims.
Paco Calvo, who is a faculty member at the University of Murcia,
Spain
, has been investigating plant intelligence and problem-solving for many years, discovering that the mimosa seems to ‘acquire knowledge through experience’ as it ceases to curl up.
‘Psychology considers that as the fundamental type of learning,’ Calvo explained to LIFEHACK.
This sequence of folding followed by no further folding supports the notion that the plant acquired knowledge through experience rather than inheriting it genetically.
The professor additionally mentioned that various plants convey information among themselves using chemical signals, tackle challenges, and seem to possess some form of memory.
A number of researchers characterize intelligence as possessing a central nervous system through which electrical impulses travel, conveying messages to other nerve cells for processing information.
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Plants instead possess a vascular system, an intricate web of cells designed for transporting water, minerals, and nutrients to facilitate their growth.
“We view plants as resources—for fuel, oxygen, textiles, and food—but we fail to appreciate them simply for what they are,” stated Calvo.
‘By comprehending an alternative form of intelligence that doesn’t necessitate brains, maybe we can grasp what brings us together within the tapestry of life.’
We have to locate the main key.
Certain plants seem to ‘recall’ past droughts and use water more sparingly compared to those that haven’t experienced such conditions before. The professor also mentioned that strawberries can learn to link light cues with areas containing nutrients.
He went on to say that plants also synchronize their release of pollen with times when pollinators like bees are active.
Scientists have likewise suggested that plants might possess the ability to count, reach conclusions, identify their kin, and perhaps retain memories of occurrences.
The issue lies in how humans define intelligence based on our own characteristics—focusing solely on creatures with brains—which causes us to overlook potential forms of intelligence and awareness beyond what we recognize.
‘In our opinion, you must be considered an animal to be deemed intelligent. This perspective is quite narrow-minded,’ stated Calvo.
A new research carried out at Cornell University
discovered that goldenrod plants release a chemical when consumed by beetles, which makes the insects believe the plant is injured and unsuitable for feeding; subsequently, neighboring goldenrods also exhibit this behavior.
Andre Kessler, a chemical ecologist and professor at Cornell University, stated: “This aligns with our understanding of intelligence.”
‘Based on the environmental cues it gathers, the plant alters its typical actions.’
Calvo is part of an increasing group of researchers advocating for a fresh perspective on how plants tackle issues and exchange information. They suggest that these processes bear striking similarities to human thought patterns, albeit lacking a centralized organ like a brain.
‘Plant cells generate pulses of electrical voltage similar to action potentials in nerve cells. When you stimulate the sensory hairs of a Venus flytrap twice and it closes, that is due to these action potentials,’ he explained.
‘Lacking a brain or nervous system doesn’t imply that you can’t engage in electrochemical signaling!’
Calvo has likewise proposed that plants ‘think’ through their vascular system—a network of cells responsible for transporting water, minerals, and nutrients to support growth.
However, it’s utilized for transmitting information, he pointed out.
‘The absence of a brain or nervous system doesn’t imply the inability to engage in some type of electrochemical signaling,’ the professor went on to say.
Electrical impulses move through the circulatory system—this means your plant doesn’t just react locally to being touched; instead, it can also respond at the opposite end of the organism.
‘Although plants lack a brain, they utilize electrochemical signaling at their distinct pace to survive.’
Calvo mentioned that the neurotransmitters found in human brains, like glutamate or GABA, are also present in plants and are occasionally utilized similarly.
“So when you have a plant with a caterpillar feeding on its leaf, the plant can utilize the neurotransmitter glutamate to initiate a calcium wave that propagates through its stem and leaves, producing a protective chemical defense to fend off the caterpillar,” he clarified.
Calvo stated that plants must adopt a distinct survival approach compared to humans due to being anchored in the ground; hence, their tactic is to “spread and dominate.”
‘So if you try to grab or attack an animal, it can fight back,’ he explained.
When it comes to plants, they are unable to perform those actions — therefore, their approach is to maintain a completely decentralized system.
If you cut off a limb, they can sprout another branch. However, if you were to amputate my arm, I wouldn’t be able to regrow it.
Studying plant intelligence might play a key role in enhancing our self-understanding and combating climate change.
‘We view plants as resources—for fuel, oxygen, textiles, and food—but we fail to appreciate them simply for what they are,’ stated Calvo.
‘By comprehending an alternate form of intelligence that doesn’t necessitate brains, maybe we can grasp what brings us together within the tapestry of life. Our task is to uncover the master key.’
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