Wednesday, July 1, 2020

World's largest graveyard of Dinosaurs found in South Africa

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Nikhita Gautam

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World's largest graveyard of Dinosaurs found in South Africa

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Global Views 360

Publication Date

July 1, 2020

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‘African dinosaurs’ exhibit at the Iziko South African Museum in Cape Town

‘African dinosaurs’ exhibit at the Iziko South African Museum in Cape Town | Source: Bruce Anderson via Wikimedia

In a village in the eastern cape of South Africa lies one of the most significant dinosaur sites ever found in the world. The site was discovered when a shepherd, Dumangwe Thyobeka found a large bone on his way to his great-grandparents’ graves, in 2015. He then took the bones to a local dinosaur enthusiast, James Rhalene. Commenting on this discovery " Mr. Rhalene said, "Growing up we were told dinosaurs were a myth, I thought they were only tales our grandparents would tell around the fire at story time", and It wasn't until reading some books that I started to believe they may be real. I've been looking into the existence of dinosaurs since 1982. He added, "You can imagine my excitement at being part of this and discovering them in my own backyard. I am so proud. Books will be written about our small village; the world will come to know of us through this discovery.”

These bones are more than 200 million years old, of around the end of the Triassic era and the beginning of the Jurassic one. When the village elder, Sginyane Ralane came to know about the discovery, he reached out to universities in South Africa for looking into it. The news eventually reached Prof. Jonah Choiniere from the University of Witwatersrand in Johannesburg, and in 2018 Jonah and his colleagues started excavating the site. “It has been one of those places where you sometimes find yourself literally tripping over a dinosaur bone. There are very few other sites I've had the chance to work where we have this richness of fossils.” says Prof Paul Barett, a dinosaur expert at The Natural History Museum, UK, after he joined the team.

A reason why this area is abundant in fossils, Natural History Museum explains, is because of the ancient river systems in the area. The area is arid for most of the year now, and the rivers flow only seasonally. However, in the ancient times, there were vast river systems flowing year-round in the region, with wide, shallow rivers which would consequently form a layer of rock 210 million years old which is up to 500 meters thick in some regions. These rivers supported diverse wildlife, including ancestors of crocodiles, possibly those of turtles and mammals and fish, amphibians and reptile-like animals. The existence of such large rivers meant that dead animals nearby would be buried in sediment before they decomposed.  

This discovery is scientifically important for a number of reasons; the era from which these bones are found is a boundary in which a mass extinction occurred. Prof. Jonah is trying to understand how the animals from before that extinction survived and how they flourished after. In the Triassic era, there were multiple dominating animals, like the crocodiles, big mammal-like animals and dinosaurs. In the Jurassic era, however, the dinosaurs are clearly dominating. Why this happened is unclear, and the rocks and fossils from this site might help with that. There were also other animals along with dinosaurs in this site which make it noteworthy. Of the animals found, there were rauisuchians, which relate to modern-day crocodiles, and were dominant on land during the Triassic. The team also found cyclodonts and dicyclodonts, where the cyclodonts are the early ancestors to all mammals, and dicyclodonts are an even earlier branch of the mammalian family tree.

All of these have a significant impact on the community too; the team signed a memorandum of understanding with the local government with huge. After the signing, local officials visited the site at Qhemega. The team has been trying to use the heavy machinery they had brought for moving fossils for improving access in and to the village. They are also developing a curriculum in high schools to include topics about fossil sites and to add geography to the curriculum, to train the younger generation about the mapping used in excavation and in many other scientific fields especially relevant in the mineral-resource rich South Africa.

So far, this site has only provided benefits for everyone involved; new discoveries and confirming data for the scientific community, and economic access, increased opportunities and a matter for pride for the local community.

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February 4, 2021 4:48 PM

The Coronavirus Disease

Severe acute respiratory syndrome-Coronavirus 2 (SARS-CoV-2) is a novel virus from the family of coronaviruses which causes COVID-19 i.e. Coronavirus Disease-2019. It is the successor of the SARS-CoV-1 which caused the SARS outbreak in the year 2003-2004. This is a positive-sense single-stranded RNA virus which has rapid mutation properties.

The etymology of the name suggests that 'Corona' comes from the Latin word corōna meaning crown, garland, or a wreath. When seen under an Electron Microscope, the virion which has a diameter of 50-200 nanometres looks like the solar corona hence named Coronavirus.

When the virus enters the body; it attaches itself to the binding site or the ACE 2 receptors of healthy lung cells through its spike protein. Then it enters the cell via this attachment and causes apoptosis or cell death. The virus also affects organs other than lungs such as the brain, heart and kidneys. The multiple impact points make it problematic for the researchers to create a vaccine in addition to its rapid mutation properties.

The disease might have a zoonotic origin i.e. the transmission occurs from animals to humans. On comparing the genomic sequences the Human Coronavirus strain is found to be 96% identical to Bat Coronavirus samples and 92% similar to the Pangolins samples. Human transmission of the disease takes place via air droplets when the infected person is coughing, sneezing or talking.

The first cases of this respiratory illness were reported to the World Health Organization (WHO) from Wuhan City, Hubei Province, China, on 31 December 2019. It is the first severe outbreak since the 2009 H1N1 Influenza Pandemic. Initially, it was supposed that the site of origination is Huanan Seafood Wholesale Market but, in May 2020 the negative samples tested, by  Chinese Center for Disease Control and Prevention, from the livestock market suggested that it was the site of the super spreading of the virus.

SARS-CoV-2 is known to have an average reproduction number of 2.2-2.6 which means that, on an average, one infected person can spread the infection to 2-3 people. Although if measures like social distancing are put into use, to reduce the exposure of the infected population, it leads to a significant reduction in transmission rates. The infection fatality rate (IFR) of COVID-19 in various studies till 16th June 2020 was projected to range 0.60% to 1% of infected people . However few studies suggested the IFR as high as 3.6%.

The testing of an individual takes place through a method known as real-time Reverse transcription Polymerization Chain reaction (rRT-PCR). The process of obtaining strains and testing the patients usually involves nasal swabs or sputum swabs; the results come in within a span of a few hours to a couple of days.

Currently, there are no known vaccines available for the virus or any specific antiviral treatments, but there are numerous vaccines in works all over the world to tackle COVID-19. Experts believe that the minimum time required to test a vaccine is 12 to 18 months.

Trials are also going on for the repurposed drugs or the drugs which are useful for treating other diseases and might be capable against COVID-19: Some of these drugs are Hydroxychloroquine, chloroquine, Remdesivir, Dexamethasone, Lopinavir-ritonavir, and Convalescent plasma.

The only current solutions for tackling the pandemic are social distancing, hand wash, hygiene and face masks.

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