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Unique resin allows 3D-printing method to add and subtract

Additive manufacturing, or 3D printing, is normally a one-way street. In a digital light processing (DLP) printer, a structured pattern is projected onto a layer of liquid resin, which cures and solidifies. This builds an object up, layer-by-layer. But if the print isn’t exactly right, there’s no easy way to fix it after the fact: it usually ends up in the trash.

In a new study, published in Advanced Materials Technologies, researchers at Lawrence Livermore National Laboratory (LLNL) developed a hybrid additive and subtractive manufacturing system with a unique that enhances traditional 3D printing by introducing dual-wavelength behavior. Under , the resin cures and hardens. Under , it degrades back into a liquid. The hybrid printing system enables corrective manufacturing, provides improved print resolution and allows for upcycling and recycling of parts.

“Imagine if a company needed a part to fit a certain machine but it’s a prototype and they’re not quite sure what they want,” said LLNL scientist and author Benjamin Alameda. “They could theoretically print with our resin. And if there were defects or something they wanted to change about it, they don’t have to print a whole new part. They could just shine another wavelength on it and modify the existing part. That’s useful and less wasteful.”

How weakness in cell structure affects the host–microbiome relationship

Cells have an internal skeleton that maintains their structure and also drives their movement. Known as the cytoskeleton, this scaffold is composed of a network of dynamic filaments made of a protein called actin.

Given how important these structures are, alterations in the proteins that work together to build and control the are often lethal or cause severe effects. For example, children born with mutations in the ARPC5 protein, which is part of the Arp2/3 complex, experience immunodeficiency and a high risk of fatal sepsis in .

“This is a rare and devastating condition, and until recently, it wasn’t clear how these mutations lead to such severe illness,” says Michael Way, who runs the Cellular Signaling and Cytoskeletal Function Laboratory at the Crick. “The only known effective treatment would involve early bone marrow transplantation to replace the faulty immune cells with ones which have a healthy actin cytoskeleton.”

Magnetically Guided Microrobots Deliver Drugs with Pinpoint Accuracy

After numerous successful trials in the model, the team sought to demonstrate what the microrobot could achieve under real clinical conditions. First, they were able to demonstrate in pigs that all three navigation methods worked and that the microrobot remains clearly visible throughout the entire procedure. The investigators then navigated microrobots through the cerebral fluid of a sheep.

“This complex anatomical environment has enormous potential for further therapeutic interventions, which is why we were so excited that the microrobot was able to find its way in this environment too,” Landers noted. “In vivo experiments conducted with an ovine model demonstrated the platform’s ability to operate within anatomically constrained regions of the central nervous system,” the investigators stated in their paper. “Furthermore, in a porcine model, all locomotion strategies were validated under clinical conditions, confirming precise microrobot navigation within the cerebrovascular system and highlighting the system’s compatibility with versatile in vivo environments.”

In addition to treating thrombosis, these new microrobots could also be used for localized infections or tumors. At every stage of development, the research team has remained focused on their goal, which is to ensure that everything they create is ready for use in operating theaters as soon as possible. The next goal is to look at human clinical trials. “The use of materials that have been FDA approved for other intravascular applications, coupled with the modular design of the robotic platform, should simplify translation and adaptability to a range of clinical workflows,” the authors concluded. Speaking about what motivates the whole team, Landers said, “Doctors are already doing an incredible job in hospitals. What drives us is the knowledge that we have a technology that enables us to help patients faster and more effectively and to give them new hope through innovative therapies.”

The Next Superintelligence Will Not Just Think. It Will Bleed

Biology needs the same kind of substrate. Without it, we are still guessing. With it, discovery starts to look predictable by design.

Drug development still leans on animal models and small patient cohorts to make billion-dollar bets. Those proxies teach us something, but they do not teach how a molecule behaves across the complexity of human biology. That is why nine out of ten drugs that succeed in animals fail in human clinical trials.

Biology needs an environment that gives intelligence the same systematic feedback that data centers gave to computation. That is what biological data centers provide. Robotic systems that sustain tens of thousands of standardized human tissues at once. Tissues that are vascularized and immune competent, clinically indistinguishable from patient biopsies under blinded review. Tissues that can be dosed, that bleed, that heal.

New lightweight polymer film can prevent corrosion

MIT researchers have developed a lightweight polymer film that is nearly impenetrable to gas molecules, raising the possibility that it could be used as a protective coating to prevent solar cells and other infrastructure from corrosion, and to slow the aging of packaged food and medicines.

The polymer, which can be applied as a film mere nanometers thick, completely repels nitrogen and other gases, as far as can be detected by laboratory equipment, the researchers found. That degree of impermeability has never been seen before in any polymer, and rivals the impermeability of molecularly-thin crystalline materials such as graphene.

“Our polymer is quite unusual. It’s obviously produced from a solution-phase polymerization reaction, but the product behaves like graphene, which is gas-impermeable because it’s a perfect crystal. However, when you examine this material, one would never confuse it with a perfect crystal,” says Michael Strano, the Carbon P. Dubbs Professor of Chemical Engineering at MIT.

Accelerating therapies for brain conditions

This pace of discovery might be expected given the extreme intricacy of the brain and psychiatric disorders.

“The brain is incredibly complex — we’re talking about tens of billions of neurons with trillions of connections,” says Kozo Kaibuchi, director of the International Center for Brain Science (ICBS) at Fujita Health University, near Nagoya in Japan. “Psychiatric and neurological disorders are also highly diverse — often involving subtle changes on a spectrum rather than one obvious cause.”

On top of that, there are further obstacles that hinder progress in developing treatments for these conditions — the difficulty of imaging inside the human brain; the scarcity of human-like models; and the blood–brain barrier, which prevents most drugs from entering the brain.

First Ever Programmable DNA Circuit Is a Breakthrough In Biocomputing

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Hello and welcome! My name is Anton and in this video, we will talk about an invention of a DNA bio computer.
Links:
https://www.nature.com/articles/s41586-023-06484-9
https://www.washington.edu/news/2016/04/07/uw-team-stores-di…perfectly/
Other videos:
https://youtu.be/x3jiY8rZAZs.
https://youtu.be/JGWbVENukKc.

#dna #biocomputer #genetics.

0:00 Quantum computer hype.
0:50 Biocomputers?
1:55 Original DNA computers from decades ago.
3:10 Problems with this idea.
3:50 New advances.
5:35 First breakthrough — DNA circuit.
7:30 Huge potential…maybe.

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New study finds bacteria in brain tumors play ‘surprising’ role in cancer growth

Newly published research in the peer-reviewed journal Nature Cancer suggests that bacteria inside brain tumors may play a far more active role in how cancers grow, spread and respond to treatment than previously understood, according to Prof. Ravid Straussman of the Weizmann Institute of Science.

For years, scientists considered tumors as places where bacteria didn’t grow.


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An Immunomodulating Peptide with Potential to Promote Anticancer Immunity Without Compromising Immune Tolerance

Background: Immune checkpoint inhibitor therapy in patients with lung cancer and metastatic melanoma is associated with exacerbation of autoimmune-related diseases. The efficacy of treatment targeting the programmed cell death receptor-1 (PD-1) checkpoint relies upon a feedback loop between interferon gamma (IFN-γ) and the interleukin-12 isoform, IL-12p40. Paradoxically, both cytokines and the anti-PD-1 antibody worsen psoriasis. We previously reported an immunomodulating peptide, designated IK14004, that inhibits progression of Lewis lung cancer in mice yet uncouples IFN-γ from IL-12p40 production in human immune cells. Methods: Immune cells obtained from healthy donors were exposed to IK14004 in vitro to further characterise the signalling pathways affected by this peptide.

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