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Monthly Archives: February 2021
Consultancy duo team up to bolster offshore wind support – reNEWS
Posted: February 6, 2021 at 8:26 am
UK engineering and consultancy outfits Apollo and Vekta Group have signed a memorandum of understanding (MoU) to offer a combined service to the offshore wind and energy sectors.
The new combined service offering brings commercial, project management, yield modelling, power, electrical, mechanical, structural and marine experience to support offshore wind developers with technical advice and also provide expertise in the area of electrification of oil and gas assets.
Apollo marine and renewables director Nigel Robinson said: Apollo and Vekta Group quickly realised that there was a natural synergy between our respective engineering and consultancy services, that would benefit clients across the energy sector.
Wind developers can access to a unique owners engineer service model, supporting a broad range of expertise through a single contract point.
Meanwhile the integrated offering further supports the drive of operator businesses to reduce their carbon footprints and to qualify the electrification of assets.
The companies have decided to join forces in response to the increase in the demand for engineering and development services, with Round 4 and Scotwind leasing rounds in the offing and the net zero targets of the hydrocarbon sector.
Vekta Group director Charles Balderston said: We believe that great collaboration is the key to finding positive ways to respond to the climate emergency and to reach net zero as quick as possible.
By working with Apollo, we strengthen our shared ambition to play a significant role in the energy transition process.
With our combined experience and capability, we aim to offer high value and agile services to the oil and gas sector as well as offshore wind developers.
RenewableUK director of strategic communications Luke Clark said: "It's great to see our member companies Apollo and Vekta Group teaming up to provide valuable services across the energy sector including offshore wind.
Many companies are successfully making the transition from fossil fuels to renewables, bringing experts with decades of experience in oil and gas to work in new roles, including innovative initiatives like powering oil and gas platforms with clean electricity from our world-leading offshore wind farms.
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Myanmar coup may force offshore project reassessments – Offshore Oil and Gas Magazine
Posted: at 8:26 am
A-6 development schematic.
(Courtesy Woodside Energy)
Offshore staff
SINGAPORE Myanmars military coup could impact planned upstream offshore investments, according to Wood Mackenzie and Maplecroft.
Wood Mackenzie research associate Saloni Kapoor said: We estimate that new upstream projects worth US$2 billion up until 2030 are yet to take final investment decision
Key developments such as PTTEPs Block M9 (Zawtika) and Woodsides Block A-6 account for around 40% of the countrys expected supply until 2030.
Incremental phases at Zawtika will provide upside to Myanmars energy mix, but if A-6 does not progress as planned, an estimated 2 tcf of gas supply is threatened. This supply is critical to make up for declining volumes from legacy fields.
Wood Mackenzie consulting director Mangesh Patankar added: Several LNG regas projects in Myanmar, including the existing small-scale terminal operated by CNTIC VPower and the proposed large-scale integrated LNG-to-Power project at Mee Laung Gyaing, are Chinese led.
We see less impact on these projects from the recent military coup, given China has always engaged with both the military and the Aung San Suu Kyi-led government.
Maplecroft senior analyst Kaho Yu said: We expect the US to restrict foreign assistance to Myanmar and impose new sanctions on those involved in the coup, particularly military officials and associated entities. Yet, additional sanctions will likely have limited impact because many relevant individuals and entities were already sanctioned by the Trump administration in 2019 over the Rohingya crisis.
Instead, any new sanctions would make it harder for responsible companies adhering to international best practice to keep operating in Myanmar due to reputational and ESG considerations.
Chinas response reflects that it is taking a wait and see approach towards the coup. Beijing has adopted a pragmatic approach towards Myanmar for decades and has been engaging both with the military and the Aung San Suu Kyi-led government. For Beijing, it does not matter who rules Myanmar, as long as those in power are not anti-China.
02/04/2021
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Offshore wind industry commits 3.9m to researching blockage effects – Windpower Monthly
Posted: at 8:26 am
Announced today (4 February), the joint industry initiative delivered by the Carbon Trust's flagship Offshore Wind Accelerator project will monitor real offshore conditions to gauge the effect of blockages at a global scale.
Led by RWE Renewables, the Global Blockage Effect in Offshore Wind (OWA Globe)project will spend 3.9 million to produce a comprehensive dataset that can be used as the industry benchmark for assessing and quantifying the impact of the blockage effect on energy production.
The refers to the way the wind flows around any obstacle it encounters, which may affect the predicted outout of wind turbines ifnot all aspects have been taken into account.
Richard Sandford, director of offshore wind development in Europe at RWE Renewables, said the offshore wind industry would benefit immensely from the data collected in the project.
By appraising and testing various industry hypotheses under live conditions, we will be able to close existing knowledge gaps and reach an industry-wide consensus on the effect," he said in a statement.
OWA Globe can increase certainty in offshore wind energy yield estimates and thereby help lower the Levelized Cost of Energy.
The blockage effect is a phenomenon that occurs as a complex interaction between the atmosphere and wind as it flows through, over and around, large offshore wind farms.
As wind approaches an obstacle the blockage its flow slows down and diverts around it hence the blockage effect. The effect is subtle, difficult to measure and hard to extract from previous data sets, creating uncertainties in current models.
While there is a broad industry consensus that wind-farm-scale blockage effects cause decelerations in front of offshore wind farms (which reduces the energy yield), different opinions exist on how to consider its downstream impacts and how to account for the redistribution of energy.
The new research will be conducted at the Heligoland wind farm cluster in the German Bight consisting of the 295MW Nordsee Ost Nordsee Ost (295MW) Offshorenorth of Helgoland, Germany, Europe Click to see full details and 303MW Amrumbank West Amrumbank West (303MW) Offshorenorth of Helgoland and west of Amrum, Germany, Europe Click to see full details wind farms, which are both owned by RWE.
The two wind farms are separated by a strip of empty sea approximately 4km wide, known as the Kaskasi gap, where RWE will construct the 342MW Kaskasi Kaskasi (342MW) Offshoreoff Heligoland, Schleswig-Holstein, Germany, Europe Click to see full details wind farm, anticipated to be commissioned in 2022.
Using dual-doppler scanning light detection and ranging (Lidar) measurements alongside turbine production data, the project is designed to assess blockage effects at full-scale and observe the atmospheric phenomena that drive it.
The project consortium currently includes of six additional wind farm developers: EDF Renewables, EnBW, Equinor, ScottishPower Renewables, Shell and Vattenfall, along with research and industry partners DTU Wind Energy and Leosphere.
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Offshore wind capacity to increase by more than a third in 2021 – Riviera Maritime Media
Posted: at 8:26 am
05 Feb 2021byDavid Foxwell
Rystad Energy says installed offshore wind capacity is set to surge in 2021. It expects installed capacity to increase by 11.8 GW this year, which is a 37% increase compared to the 31.9 GW of capacity that had been installed by the end of 2020
China will continue to lead new capacity additions, contributing 63% of expected growth.
After 2021, China will begin phasing out feed-in-tariffs and many developers are therefore pushing to complete projects by then.
Rystad Energy said that, despite the Covid-19 pandemic, global installed offshore wind capacity rose by 15% in 2020, to 31.9 GW, from 27.7 GW at the end of 2019. China was the main contributor in 2020, accounting for 39% of last additions, followed by the Netherlands (18%) and the UK (17%).
Rystad Energy offshore wind product manager Alexander Fltre said, China had a construction backlog of more than 10 GW going into 2020. Chinese developers are racing to install more turbines by the end of 2021 in order to claim full feed-in-tariffs.
This means 2021 is going to see major capacity additions, particularly since some projects initially scheduled for commissioning in 2020 ended up slipping into 2021.
Like China, Europe and the US also saw some delays in 2020 due to the Covid-19 pandemic. Nevertheless, offshore wind developers continued to make final investment decisions for projects.
In 2020, the UK sanctioned more than 4.7 GW of offshore wind and the Netherlands more than 2.2 GW.
In H2 2020, almost 25 GW of capacity was added to the global backlog. Currently, Brazil has no operational offshore wind capacity, but its backlog grew significantly in 2020 as the country added more than 15 GW to the drawing board.
In addition, other countries in the Asia Pacific apart from China are preparing for a ground-breaking year, including Taiwan and Vietnam.
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Rich Hamptons Residents Scared of ‘Violent Energy Releases’ From Offshore Wind Farm Cable – Gizmodo
Posted: at 8:26 am
Photo: Matthew Eisman (Getty Images)
If New York doesnt meet its renewable energy goals over the next few years, some billionaires might be to blame. A group of well-heeled Hamptons property owners filed a lawsuit this week seeking to block a key piece of infrastructure needed to construct a large wind farm off the coast of Long Island.
The Citizens for the Preservation of Wainscotts suit alleges that the town of East Hamptons board rushed ahead with plans to install a cable along a small beach and town roads in the hamlet of Wainscott. The cable would connect the proposed South Fork Wind Farm owned by Danish company rsted to the grid. Its one of five offshore wind projects New York is pursuing to help meet its target of 70% renewable energy in the next decade.
At first glance, the lawsuit reads like a normal grassroots manifesto against an evil corporation and greedy politicians. The group affirms its support for renewable energy, but cites concerns about beach erosion and the health impacts the project may have on residents. It alleges that the town was eager to get the $29 million in payments from rsted, which group members have repeatedly referred to as a hedge fund-created company, and did not sufficiently consider alternate routes.
Digging into the groups members and supporters, however, throws this vilification of profit into an ironic light. One of the groups founders is Alex Edlich, a senior partner at consulting giant McKinsey, while billionaire Ronald Lauder, who donated $1 million last fall to target Senate Democrats in New York, is also involved. Lauders familyof Este Lauder moneymoved a centuries-old log cabin from Virginia onto one of their properties in the Hamptons.
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Signatories on some of the groups petitions include Daniel Neidich, a former business partner of Trump treasury secretary and former hedge fund guy Steven Mnuchin; financial services giant Blackstones top lawyer John Finley (who was a major contributor to various GOP PACs last year); and Faith Popcorn, a well-known futurist who runs a predictive marketing firm (her current predictions include 25% of marriages will be between humans and bots by 2025).
Most of these signers own at least one property in Wainscott, a hamlet where homes are just a smidge out of the price range of most Americans. To give you an idea of the property values, theres a single-family home along the road where the cable would be installed currently listed for sale at $49.5 million that comes with a pool, expansive gym with sauna and steam room, golf simulator, and whatever the hell a Crestron controlled environment augmented by Lutron is.
The group has spent more than $300,000 to retain a public affairs firm in Manhattan to represent it, and, as Politico reported, spent more than $28,000 on a Truth About rsted campaign on Facebook in 2019. A multibillion-dollar corporation is set to make MILLIONS of dollars off of the South Fork wind farm project on the backs of hard-working New Yorkers like you, the campaigns website reads.
All this money is being spent for something that, in the grand scheme of infrastructure projects, seems pretty minimal. The contentious cable in question is like an extension cord running from the planned wind farm offshore, Willett Kempton, a professor of marine science and policy at the University of Delaware, said.
Its just a wire to connect the source of electricity, the offshore wind farm, to substations, where power goes, Kempton added.
He said that the biggest environmental concerns with wind farm projects occur offshore, where turbine installation can have impacts on marine mammals and birds, and that onshore cable installation is akin to a routine construction project.
The lawsuit and petitions circulated by the group cite concerns over the health impacts of the cable and its installation, including electromagnetic fields and violent energy releases in manholes. But Kempton pointed out that the cable will likely be buried at least 6 feet underground and encased in a protective barrier.
The idea that [electromagnetic fields] is some kind of risk...Frankly, its stupid, he said. If [electricity] wasnt benign, youd be dead from using your cell phone as much as you do.
And honestly, that seems like a pretty weird thing for a group that includes a person who anticipates a quarter of us will be boning robots to worry about.
For us, we cant believe that theyre really upset over a cable, Citizens Campaign for the Environments executive director Adrienne Esposito said. Nobody who buys a house says, excuse me, are there any cables in the road? Because the answer is always yes.
Citizens Campaign for the Environment is one of several national and local conservation and environmental groups who have voiced support for the wind farms construction. Esposito said that she has been dealing with the Citizens for the Preservation of Wainscott for years during the review process.
Theres a hell of a lot of wind off the U.S. coasts that we canand definitely shouldbe using. The Department of Energy has estimated that the U.S. has up to 2,000 gigawatts of offshore wind potential, an enormous reserve that could help the country more easily transition to 100% renewable energy. Weirdly, theres only one operating offshore wind farm in the U.S.but states are teaming up with developers in hopes of creating green jobs and more renewable energy.
The South Fork Wind project has had a rigorous public input review, Esposito said. [Citizens for the Preservation of Wainscott] have made their presence known, as they should and as they have a right to, at every single [meeting]. Theyve had the same opportunities the rest of us have had. I think because theyre so wealthy, they get confused and think that they should have special conditions or something.
In a press release sent to Earther, Citizens for the Preservation of Wainscott Chairwoman Gouri Edlich said the town appeased the developer and put Wainscott at risk in the process.
We all support renewable energy, and we want to see that goal completed, Edlich said. But there are better ways to accomplish this important goal.
Wealthy NIMBYs have played a role in killing clean energy projects around the country. Cape Wind, a project off Massachusetts Cape Cod, got delayed more than a decade and ultimately scrapped thanks to suits from wealthy residents with oceanfront properties (including the late Sen. Ted Kennedy). Solar projects in Californias deserts have faced serious opposition and roadblocks from residents wary of industrialization. On the flip side, polluting fossil fuel infrastructure is often near low-income communities of color, many of which lack the resources to fight back.
Lawsuits like this can have a major impact on the speed of wind projects getting installed, Kempton said. Its really frustrating to see people blocking solutions to climate change based on incorrect information that really has no factual basis, he said.
Esposito said that attorneys in her coalition dont believe the lawsuit will be a major roadblock to the South Fork Wind project. But, she said, I never underestimate the power of billionaires.
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Rich Hamptons Residents Scared of 'Violent Energy Releases' From Offshore Wind Farm Cable - Gizmodo
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RWE forecasts 11% rise in offshore wind profits – reNEWS
Posted: at 8:26 am
RWE has said adjusted EBITDA for its offshore winddivision has increased by 11% to 1069m,compared with the pro forma result for previous year.
The boardattributed the rise in its preliminary results to very good wind conditions in the first quarter of 2020.
Adjusted EBITDA foronshore wind and solar improvedby 7% to 472m, compared to pro forma result 2019.
This was mainly due to new assets taken into operation.
Because of the Covid-19 pandemic, the commissioning of some plants has been delayed, in particular in the US.
Furthermore, wind conditions in the fourth quarter were particularly weak.
Overall, RWE expects adjusted EBITDA totop 3.2bn and adjusted EBIT to be 1.8bn.
Chief financial officer Markus Krebber said: "Due to a very good operational performance, we expect an excellent result for fiscal 2020, which exceeds our guidance significantly.
"This is mainly driven by an extraordinarily strong performance of Supply & Trading.
"We have also expanded our portfolio in wind and solar power plants, thus delivering on our growth strategy.
"In times like this when we globally and personally might face challenges from the Covid-19 pandemic, I am more than grateful for the commitment of our employees and their outstanding dedication.
"We confirm our dividend target of 0.85 per share for fiscal 2020 and we will propose this to our Annual General Meeting on 28 April 2021, which will be held virtually."
All figures are preliminary, with the final figures for fiscal 2020 to be released on 16 March 2021.
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BOEM to Restart Permitting for Major US Offshore Wind Project – Offshore Engineer
Posted: at 8:26 am
February 3, 2021
Peterjohn Chisholm / Adobe Stock
The Biden administration said on Wednesday it would restart permitting for the first major U.S. offshore wind farm, reversing a Trump administration decision that canceled the process late last year.
The U.S. Bureau of Ocean Energy Management (BOEM) said in a statement it would resume environmental review of the Vineyard Wind project as part of the administration's broad plan to speed renewable energy development on federal lands and waters.
"BOEM is committed to conducting a robust and timely review of the proposed project," Director Amanda Lefton said in the statement.
In December, Vineyard Wind requested a pause in the federal permitting process while it determined whether changes to its design were necessary because of a switch in turbine manufacturers, prompting BOEM to terminate its entire review.
Former President Donald Trump had promised to support the nascent U.S. industry as part of his energy dominance agenda, but the permitting of Vineyard Wind was delayed repeatedly in part due to concerns its turbines would interfere with commercial fishing.
Vineyard Wind is a joint venture between Avangrid Inc , a unit of Spain's Iberdrola, and Denmark's Copenhagen Infrastructure Partners. The project is 15 miles (24 km) off the coast of Massachusetts. Once constructed, it is expected to provide power to more than 400,000 Massachusetts homes.
A Vineyard Wind official was not immediately available for comment.
(Reporting by Nichola Groom; Editing by Leslie Adler and Peter Cooney)
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Indian companies go on an offshore bond binge – Mint
Posted: at 8:25 am
Indian corporates are rushing to tap the offshore bond market to raise debt with the market also opening up to high-yield or junk bond issuers.
In just over a month in 2021, Indian firms have raised $3.3 billion by issuing bonds to overseas investors, showed data from financial markets data provider Refinitiv.
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Private firms such as Adani Ports and SEZ Ltd, Continuum Green Energy Ltd and state-run entities such as SBI, Export Import Bank of India and Power Finance Corp. have mobilized funds through the offshore debt capital market this year. Others such as UltraTech Cement Ltd, ReNew Power Pvt. Ltd and IRB Infrastructure Developers Ltd are also planning to use the route in the coming weeks.
This year has opened on a positive note for the offshore bond market, with an oversubscribed bond issuance by Exim Bank followed by other private and public players," said Ravi Dubey, a partner at law firm IndusLaw.
From an issuer perspective, there is a clear advantage of lower interest rates in the offshore bond market. Some of the issuers are tapping the offshore bond market to repay their higher-priced loans. For others, these bonds provide an additional avenue for debt financing, especially where domestic lenders have hit their group limits," he said.
India Inc. began 2020 with a flurry of offshore bond sales but this came to a halt due to covid which spooked the debt capital market, making it more expensive for firms to raise capital. Still, they managed to raise $13.9 billion in 2020, though the number was significantly lower than the $21.4 billion raised in 2019, data showed.
According to industry experts, while the pandemic had made it difficult for lower-rated firms or so-called high-yield issuers, the market has opened up for such issuers too in recent months.
Fundamentally, what you have is a market which was until now not open for crossover or high-yield kind of issuers. The market has now opened for these issuers. Hence, people are now looking to take advantage of this opportunity," said Shantanu Sahai, managing director and head of debt at Nomura India.
Right now, we are seeing a very distinct flavour in the set of companies that are tapping the market. There are a bunch of renewable or ESG-related companies that are going out and issuing bonds. The second category which is now becoming active is manufacturing sector companies," he said.
IndusLaws Dubey said leading players in the banking and finance sector will continue to tap the offshore bond markets, particularly in light of budget announcements.
To be sure, while borrowing costs are lower overseas, the differential may not be much once all costs of offshore borrowing are considered, especially for lower-rated companies.
While borrowing costs are low overseas, for a lot of the issuers it is not necessarily cheaper compared to rates in India. On the margins, it is probably more expensive to issue offshore, because when you add the withholding tax, hedging costs, rating and listing costs, in aggregate, the cost comes out to be a little more expensive than in India," said Sahai. But it is a good way for companies to diversify their sources of funds."
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Genetic Analysis Reveals Evolution of the Enigmatic Y Chromosome in Great Apes – SciTechDaily
Posted: at 8:25 am
Researchers have reconstructed the ancestral sequence of the great ape Y chromosome by comparing three existing (gorilla, human, and chimpanzee) and two newly generated (orangutan and bonobo) Y chromosome assemblies. The new research shows that many gene families and multi-copy sequences were already present in the great ape Y common ancestor and that the chimpanzee and bonobo lineages experienced accelerated gene death and nucleotide substitution rates after their divergence from the human lineage. Credit: Dani Zemba and Monika Cechova, Penn State
Researchers reconstruct the ancestral great ape Y and show its rapid evolution in bonobo and chimpanzee.
New analysis of the DNA sequence of the male-specific Y chromosomes from all living species of the great ape family helps to clarify our understanding of how this enigmatic chromosome evolved. A clearer picture of the evolution of the Y chromosome is important for studying male fertility in humans as well as our understanding of reproduction patterns and the ability to track male lineages in the great apes, which can help with conservation efforts for these endangered species.
A team of biologists and computer scientists at Penn State sequenced and assembled the Y chromosome from orangutan and bonobo and compared those sequences to the existing human, chimpanzee, and gorilla Y sequences. From the comparison, the team was able to clarify patterns of evolution that seem to fit with behavioral differences between the species and reconstruct a model of what the Y chromosome might have looked like in the ancestor of all great apes.
A paper describing the research was published in the journal Proceedings of the National Academy of Sciences.
The Y chromosome is important for male fertility and contains the genes critical for sperm production, but it is often neglected in genomic studies because it is so difficult to sequence and assemble, said Monika Cechova, a graduate student at Penn State at the time of the research and co-first author of the paper. The Y chromosome contains a lot of repetitive sequences, which are challenging for DNA sequencing, assembling sequences, and aligning sequences for comparison. There arent out-of-the-box software packages to deal with the Y chromosome, so we had to overcome these hurdles and optimize our experimental and computational protocols, which allowed us to address interesting biological questions.
The Y chromosome is unusual. It contains relatively few genes, many of which are involved in male sex determination and sperm production; large sections of repetitive DNA, short sequences repeated over and over again; and large DNA palindromes, inverted repeats that can be many thousands of letters long and read the same forwards and backwards.
Previous work by the team comparing human, chimpanzee, and gorilla sequences had revealed some unexpected patterns. Humans are more closely related to chimpanzees, but for some characteristics, the human Y was more similar to the gorilla Y.
If you just compare the sequence identitycomparing the As, Ts, Cs, and Gs of the chromosomeshumans are more similar to chimpanzees, as you would expect, said Kateryna Makova, Pentz Professor of Biology at Penn State and one of the leaders of the research team. But if you look at which genes are present, the types of repetitive sequences, and the shared palindromes, humans look more similar to gorillas. We needed the Y chromosome of more great ape species to tease out the details of what was going on.
The team, therefore, sequenced the Y chromosome of a bonobo, a close relative of the chimpanzee, and an orangutan, a more distantly related great ape. With these new sequences, the researchers could see that the bonobo and chimpanzee shared the unusual pattern of accelerated rates of DNA sequence change and gene loss, suggesting that this pattern emerged prior to the evolutionary split between the two species. The orangutan Y chromosome, on the other hand, which serves as an outgroup to ground the comparisons, looked about like what you expect based on its known relationship to the other great apes.
Our hypothesis is that the accelerated change that we see in chimpanzees and bonobos could be related to their mating habits, said Rahulsimham Vegesna, a graduate student at Penn State and co-first author of the paper. In chimpanzees and bonobos, one female mates with multiple males during a single cycle. This leads to what we call sperm competition, the sperm from several males trying to fertilize a single egg. We think that this situation could provide the evolutionary pressure to accelerate change on the chimpanzee and bonobo Y chromosome, compared to other apes with different mating patterns, but this hypothesis, while consistent with our findings, needs to be evaluated in subsequent studies.
In addition to teasing out some of the details of how the Y chromosome evolved in individual species, the team used the set of great ape sequences to reconstruct what the Y chromosome might have looked like in the ancestor of modern great apes.
Having the ancestral great ape Y chromosome helps us to understand how the chromosome evolved, said Vegesna. For example, we can see that many of the repetitive regions and palindromes on the Y were already present on the ancestral chromosome. This, in turn, argues for the importance of these features for the Y chromosome in all great apes and allows us to explore how they evolved in each of the separate species.
The Y chromosome is also unusual because, unlike most chromosomes it doesnt have a matching partner. We each get two copies of chromosomes 1 through 22, and then some of us (females) get two X chromosomes and some of us (males) get one X and one Y. Partner chromosomes can exchange sections in a process called recombination, which is important to preserve the chromosomes evolutionarily. Because the Y doesnt have a partner, it had been hypothesized that the long palindromic sequences on the Y might be able to recombine with themselves and thus still be able to preserve their genes, but the mechanism was not known.
We used the data from a technique called Hi-C, which captures the three-dimensional organization of the chromosome, to try to see how this self-recombination is facilitated, said Cechova. What we found was that regions of the chromosome that recombine with each other are kept in close proximity to one another spatially by the structure of the chromosome.
Working on the Y chromosome presents a lot of challenges, said Paul Medvedev, associate professor of computer science and engineering and of biochemistry and molecular biology at Penn State and the other leader of the research team. We had to develop specialized methods and computational analyses to account for the highly repetitive nature of the sequence of the Y. This project is truly cross-disciplinary and could not have happened without the combination of computational and biological scientists that we have on our team.
Reference: Dynamic evolution of great ape Y chromosomes by Monika Cechova, Rahulsimham Vegesna, Marta Tomaszkiewicz, Robert S. Harris, Di Chen, Samarth Rangavittal, Paul Medvedev and Kateryna D. Makova, 5 October 2020, Proceedings of the National Academy of Sciences.DOI: 10.1073/pnas.2001749117
In addition to Cechova, Makova, Vegesna, and Medvedev, the research team at Penn State included Marta Tomaszkiewicz, Robert S. Harris, Di Chen, and Samarth Rangavittal. The research was supported by the U.S. National Institutes of Health, the U.S. National Science Foundation, the Clinical and Translational Sciences Institute, the Institute of Computational and Data Sciences, the Huck Institutes of the Life Sciences, and the Eberly College of Science of the Pennsylvania State University, and by the CBIOS Predoctoral Training Program awarded to Penn State by the National Institutes of Health.
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Did a Supermassive Black Hole Influence the Evolution of Life on Earth? – Scientific American
Posted: at 8:24 am
In 1939, Albert Einstein published a paper in Annals of Mathematics, arguing that black holes do not exist in nature. A quarter of a century later, Maarten Schmidt discovered quasars as powerful sources of light at cosmological distances. These enigmatic point-like sources were explained in the mid-1960s by Yakov Zeldovich in the East and Ed Salpeter in the West as supermassive black holes that are fed with gas from their host galaxies. When gas flows towards the black hole, it swirls like water going down the drain. As the gas approaches a fraction of the speed of light at the innermost stable circular orbit (ISCO) around the black hole, it heats-up by rubbing against itself through turbulent viscosity.
Consequently, its accretion disk glows brightly, radiating away about a tenth of its rest mass and exceeding by orders of magnitude the total luminosity from stars in its host galaxy. High feeding rates make quasars visible all the way out to the edge of the visible Universe. Decades later, astronomers found that almost every galaxy hosts a supermassive black hole at its center, which is starved most of the time but bursts sporadically for merely tens of millions of years during each burst. The quasars resemble a baby that tends to remove food off the dining table as soon as it is fed by virtue of becoming too energetic.
This year, the Nobel Prize in Physics was awarded to Andrea Ghez and Reinhard Genzel for providing conclusive evidence that a black hole, albeit starved at the present time, lurks also at the center of our own Milky Way galaxy. This monster, weighing four million Suns, is dormant right now, glowing as the feeble radio source Sagittarius A* (abbreviated SgrA*), which is a billion times fainter than it would have been if it was fed as generously as a quasar.
Even though SgrA* is dim right now, we have clues that it must have experienced episodes of vigorous feeding in the past. This is not a surprise, given that a gas cloud approaching the Galactic center or a star passing within ten times the horizon scale of SgrA* (which translates to roughly the Earth-Sun separation), would get spaghettified by the strong gravitational tide there and turn into a stream of gas that triggers a quasar-like flare.
The smoking gun evidence for recent feeding episodes of SgrA* by massive quantities of gas is that young stars around SgrA* orbit in preferred planes. This implies that these stars formed out of planar gas disks, just like the planets in the Solar system plane or the stars in the Milky Way disk. Since the age of the stars near SgrA* is less than a percent of the age of the Milky Way galaxy, major accretion episodes from disruption of gas clouds must have occurred at least a hundred of times around SgrA*, based on the Copernican principle that the present time is not special. Indeed, a pair of giant blobs of hot gas, called the Fermi bubbles, are observed to emanate from the Galactic center along the rotation axis of the Milky Way, implying a recent accretion episode around SgrA* that could have powered them. Theoretical calculations imply that in addition to disruption of massive gas clouds, individual stars are also scattered into the vicinity of the black hole and get tidally disrupted once every ten thousand years. The intense feeding from the resulting debris streams could lead to the brightest flares from SgrA*. Such tidal disruption events of stars are indeed observed in other galaxies at the expected rate.
Would the resulting flares of SgrA* have any implications for life on Earth? In principle, they could, since they carry damaging X-ray and Ultraviolet (XUV) radiation. In collaboration with my former postdoc, John Forbes, we showed in 2018 that the XUV radiation emitted during such flares has the capacity to evaporate the atmospheres of Mars or Earth if the Solar system had only been ten times closer to the center of the Milky Way. But even at larger distances, the XUV radiation could suppress the growth of complex life, creating an effect similar to stepping on a lawn so frequently that you inhibit its growth.
At the current location of the Sun, terrestrial life is safe from XUV flares of SgrA*. However, recent studies indicate that the birthplace of the Sun may have been significantly closer to the Galactic center and that the Sun migrated to its current location through gravitational kicks. The exposure to past XUV flares from SgrA* at closer distances, could have harmed complex life during the early evolution of the Earth. This might explain why the oxygen level in the Earths atmosphere rose to its currently high level only after two billion years, perhaps only after the Earth was sufficiently far away from SgrA*. In collaboration with Manasvi Lingam, I am currently exploring this possible connection between terrestrial life and the migration of the Sun away from the Galactic center.
Traditionally, the Sun was thought to be the only astronomical source of light that affected life on Earth. But it is also possible that the black hole, SgrA* played an important role in shaping the history of terrestrial life. A surprising realization of this sort is similar to figuring out that a stranger might have impacted your family history before you were born. If a link between SgrA* and terrestrial life can be established, then this supermassive black hole might trigger a second Nobel Prize.
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Did a Supermassive Black Hole Influence the Evolution of Life on Earth? - Scientific American
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