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Category: biological – Page 147

The menagerie of bacterial and fungal species living among us is ever growing — and this is no exception in low-gravity environments, such as the International Space Station (ISS).

Researchers from the United States and India working with NASA have now discovered four strains of bacteria living in different places in the ISS – three of which were, until now, completely unknown to science.

Three of the four strains were isolated back in 2015 and 2016 – one was found on an overhead panel of the ISS research stations, the second was found in the Cupola, the third was found on the surface of the dining table; the fourth was found in an old HEPA filter returned to Earth in 2011.

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Photosynthetic light-harvesting antennae transfer energy toward reaction centers with high efficiency, but in high light or oxidative environments, the antennae divert energy to protect the photosynthetic apparatus. For a decade, quantum effects driven by vibronic coupling, where electronic and vibrational states couple, have been suggested to explain the energy transfer efficiency, but questions remain whether quantum effects are merely consequences of molecular systems. Here, we show evidence that biology tunes interpigment vibronic coupling, indicating that the quantum mechanism is operative in the efficient transfer regime and exploited by evolution for photoprotection. Specifically, the Fenna–Matthews–Olson complex uses redox-active cysteine residues to tune the resonance between its excitons and a pigment vibration to steer excess excitation toward a quenching site.

Photosynthetic species evolved to protect their light-harvesting apparatus from photoxidative damage driven by intracellular redox conditions or environmental conditions. The Fenna–Matthews–Olson (FMO) pigment–protein complex from green sulfur bacteria exhibits redox-dependent quenching behavior partially due to two internal cysteine residues. Here, we show evidence that a photosynthetic complex exploits the quantum mechanics of vibronic mixing to activate an oxidative photoprotective mechanism. We use two-dimensional electronic spectroscopy (2DES) to capture energy transfer dynamics in wild-type and cysteine-deficient FMO mutant proteins under both reducing and oxidizing conditions. Under reducing conditions, we find equal energy transfer through the exciton 4–1 and 4–2–1 pathways because the exciton 4–1 energy gap is vibronically coupled with a bacteriochlorophyll-a vibrational mode.

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As the world fights the SARS-CoV-2 virus causing the COVID-19 pandemic, another group of dangerous pathogens looms in the background. The threat of antibiotic-resistant bacteria has been growing for years and appears to be getting worse. If COVID-19 taught us one thing, it’s that governments should be prepared for more global public health crises, and that includes finding new ways to combat rogue bacteria that are becoming resistant to commonly used drugs.

In contrast to the current pandemic, viruses may be be the heroes of the next epidemic rather than the villains. Scientists have shown that viruses could be great weapons against bacteria that are resistant to antibiotics.

I am a biotechnology and policy expert focused on understanding how personal genetic and biological information can improve human health. Every person interacts intimately with a unique assortment of viruses and bacteria, and by deciphering these complex relationships we can better treat infectious diseases caused by antibiotic-resistant bacteria.

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Open AI, the research company founded by Elon Musk, has just discovered that their artificial neural network CLIP shows behavior strikingly similar to a human brain. This find has scientists hopeful for the future of AI networks’ ability to identify images in a symbolic, conceptual and literal capacity.

While the human processes by correlating a series of abstract concepts to an overarching theme, the first biological neuron recorded to operate in a similar fashion was the “Halle Berry” neuron. This neuron proved capable of recognizing photographs and sketches of the actress and connecting those images with the name “Halle Berry.”

Now, OpenAI’s multimodal vision system continues to outperform existing systems, namely with traits such as the “Spider-Man” neuron, an artificial neuron which can identify not only the image of the text “spider” but also the comic book character in both illustrated and live action form. This ability to recognize a single concept represented in various contexts demonstrates CLIP’s abstraction capabilities. Similar to a human brain, the capacity for abstraction allows a vision system to tie a series of images and text to a central theme.

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One of the major unsolved mysteries of biological science concerns the question of where and in what form information is stored in the brain. I propose that memory is stored in the brain in a mechanically encoded binary format written into the conformations of proteins found in the cell-extracellular matrix (ECM) adhesions that organise each and every synapse. The MeshCODE framework outlined here represents a unifying theory of data storage in animals, providing read-write storage of both dynamic and persistent information in a binary format. Mechanosensitive proteins that contain force-dependent switches can store information persistently, which can be written or updated using small changes in mechanical force. These mechanosensitive proteins, such as talin, scaffold each synapse, creating a meshwork of switches that together form a code, the so-called MeshCODE. Large signalling complexes assemble on these scaffolds as a function of the switch patterns and these complexes would both stabilise the patterns and coordinate synaptic regulators to dynamically tune synaptic activity. Synaptic transmission and action potential spike trains would operate the cytoskeletal machinery to write and update the synaptic MeshCODEs, thereby propagating this coding throughout the organism. Based on established biophysical principles, such a mechanical basis for memory would provide a physical location for data storage in the brain, with the binary patterns, encoded in the information-storing mechanosensitive molecules in the synaptic scaffolds, and the complexes that form on them, representing the physical location of engrams. Furthermore, the conversion and storage of sensory and temporal inputs into a binary format would constitute an addressable read-write memory system, supporting the view of the mind as an organic supercomputer.

I would like to propose here a unifying theory of rewritable data storage in animals. This theory is based around the realisation that mechanosensitive proteins, which contain force-dependent binary switches, can store information persistently in a binary format, with the information stored in each molecule able to be written and/or updated via small changes in mechanical force. The protein talin contains 13 of these switches (Yao et al., 2016; Goult et al., 2018; Wang et al., 2019), and, as I argue here, it is my assertion that talin is the memory molecule of animals. These mechanosensitive proteins scaffold each and every synapse (Kilinc, 2018; Lilja and Ivaska, 2018; Dourlen et al., 2019) and have been considered mainly structural. However, these synaptic scaffolds also represent a meshwork of binary switches that I propose form a code, the so-called MeshCODE.

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Help support our video productions http://www.patreon.com/scifri.
Produced by Luke Groskin.
Filmed by Christian Baker.
Music by Audio Network.
Additional Footage and Stills Provided by Joel Simon, Pond5, Shutterstock, Nic Symbios, Pit Schuni (C.C. BY 2.0)Okinawa Institute of Science and Technology (C.C. BY 2.0), Eleni Katafori, Bradely Smith, Loic Royer, Alexander Reben.

Inspired by the forces behind evolution, artist and tool designer Joel Simon programmed a network of computers to blend and “breed” together images over and over using users’ preferences as its guide. Although thousands of users, breeding millions of bizarre and beautiful images, Joel’s goal was more conceptual: He wanted to see if the system could evolve art and what types of forms might emerge from the process.

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Volunteer students at Beihang University have reportedly lived in the Lunar Palace 1 biosphere environment for 370 days. Media outlets have reported that two groups of students took turns living in the biosphere over the course of 370 days, and required minimal supplies from the outside.

Many groups have tried building and living in biospheres over the years. The goal has always been to find out if it is possible to build a self-sustaining ecosystem that could be used on another planet. The most well-known was Biosphere 2—it was built in the Arizona desert and hosted people for two years, but ultimately failed in its goal to remain self-supporting. However, such efforts have led to a better understanding of how a real might work and how plants might be grown beyond Earth.

Over the past several years, the Chinese government has made it clear that they plan to send people to the in the coming years. They also plan to build a permanent colony there, to be shared with other countries, as soon as it is feasible. As part of that effort, they have been planning, building and testing biospheres since 2014. In 2017, they finished construction of the Lunar Palace 1 biosphere. Once set up and tested, four volunteers entered the facility and stayed for 110 days. Shortly thereafter, another group moved into the biosphere and stayed for 65 days—they were replaced immediately by another team who spent 200 days in the test environment. That team was then replaced by the first team, which spent an additional 105 days in the facility. Altogether, the two groups spent 370 consecutive days in the biosphere.

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The Future Of Food And Beverage Innovation And Venturing — Dr. Ellen De Brabander, Ph.D. — Senior Vice President, R&D, PepsiCo

Dr. Ellen de Brabander, is Senior Vice President, Research and Development, at PepsiCo, the American multinational food, snack, and beverage company.

Dr. de Brabander has broad set of responsibilities at Pepsico and currently leads their global R&D functions including the Food Safety, Quality, Strategy & Portfolio Management, and their Sensory and Regulatory Affairs teams. She also leads their R&D Digital Transformation initiatives to transform the innovation process to bring new, innovative products to the market.

Dr. de Brabander is also a member of the board of governors at the New York Academy of Sciences and has served as Treasurer and board member International Life Science Institute of North America, an organization that brings together scientists from government, academia and industry to uphold the scientific integrity and objectivity of nutrition and food safety science in order to ethically improve food systems for the betterment of public health.

Additionally, Dr. de Brabander has also served as the interim and founding CEO of EIT Food (part of the EU’s European Institute of Innovation and Technology), which is a unique $1.5 Billion Euro innovation consortium with more than 50 partners from industry and academia, focused on transforming the food sector by designing and delivering unique and high impact research, innovation, business creation and education programs.

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