Tag

Replication

All articles tagged with #replication

science15 days ago•6 min saved

Europe launches replication drive to test carbon quantum dot biosensors

A Europe-backed NanoBubbles project is funding nanoscientists to replicate a 2012 study that carbon quantum dots can sense copper ions inside living cells, the first large-scale replication effort in the physical sciences aimed at the reproducibility crisis; initial attempts failed to reproduce the reported fluorescence change, illustrating how small impurities, incomplete protocols, and cross-lab variation can affect results, as the ERC-backed effort seeks self-correction in science.

via Nature|

#biosensors #nanoscience #quantum-dots

science1 month ago•7 min saved

RNA Obelisks in Humans Blur the Line Between Living and Nonliving

Researchers report thousands of circular, non-coding RNA structures, dubbed obelisks, found across human saliva and gut microbiomes. They behave like replicators but do not resemble viruses, plasmids, or other known genetic elements, lacking protein-coding capacity and a protective shell. Their replication mechanism remains unknown, and they defy existing biological classifications, suggesting a possible new life-like class within the microbiome. There is no evidence of harm to humans yet, but their ubiquity hints at ecological or evolutionary significance and a need for new taxonomic frameworks.

via Indian Defence Review|

#circular-rna #microbiome #obelisks

technology1 month ago•31 min saved

One Primary, Dozens of Replicas: OpenAI’s PostgreSQL scaling for 800M users

OpenAI reportedly scales PostgreSQL to serve hundreds of millions of users by using a single write master with many read replicas, while offloading some write-heavy workloads to Azure Cosmos DB to relieve the primary. The approach favors a simpler, single-primary architecture but carries trade-offs such as potential single-point-of-failure risk, MVCC write amplification, and challenges around schema changes and cross‑shard operations. Commenters debate replication lag, WAL shipping, cost of large cloud instances, and when to shard or migrate workloads to non‑Postgres systems. Overall, the piece argues that with the right hardware and careful design, PostgreSQL can scale far beyond what many assume, though it isn’t a universal recipe and comes with notable complexity.

via Hacker News|

#cosmosdb #openai #postgresql

science1 month ago•8 min saved

Replication Reframes Quantum Topology Breakthroughs

A University of Pittsburgh–led team replicated four claimed topological effects in nanoscale quantum devices and found that dramatic “smoking gun” signals could arise from ordinary, mundane factors. The study advocates broader data sharing, more exhaustive exploration of experimental parameter space, and transparent reporting to prevent premature claims and strengthen peer review in condensed-matter quantum research.

via SciTechDaily|

#data-sharing #peer-review #quantum-computing

science-and-technology2 years ago•2 min saved

Controversial Superconductor Study Withdrawn Amid Chinese Researchers' Challenge

A study claiming the creation of a room-temperature superconducting material has been retracted by scientific journal Nature after Chinese researchers raised doubts about its validity. The paper, published earlier this year, gained widespread attention but was found to have manipulated data. The retraction raises questions about the initial claims and the scientific rigor behind them. Room-temperature superconductors are highly sought after for their potential applications in various fields.

via IndiaTimes|

#replication #retraction #room-temperature-superconductivity

science2 years ago•1 min saved

Unprecedented Discovery: Viruses Form Unusual Attachments in Groundbreaking Study

Scientists have made a groundbreaking discovery by observing two bacteriophage viruses, one being a satellite virus, attaching to each other. This is the first time such an event has been observed, as satellite viruses typically depend on helper viruses for replication. The attachment occurred at the 'neck' of the helper virus, where its outer shell connects to its tail. The discovery was made using an electron microscope, and the findings were published in the Journal of the International Society for Microbial Ecology.

via IndiaTimes|

#bacteriophages #discovery #electron-microscope

diytech2 years ago•1 min saved

Crafting a Challenging Wooden Game Boy with CNC

A beginner in CNC woodworking successfully replicated an original Game Boy case using walnut wood, utilizing nine different tools to reproduce the details of the injection-molded plastic case. The top and bottom shells were milled from both sides, requiring registration tricks and fixturing techniques. The front face lettering was milled out and filled with white spray paint, creating a beautiful contrast with the dark wood. While some challenges arose due to wood's limitations compared to plastic, the final result is a stunning and unique wooden Game Boy.

via Hackaday|

#cnc #diytech #engraving

science-and-technology2 years ago•6 min saved

"Streamline Complex Techniques with Online Protocols for Concise Methods Sections"

Researchers have developed a method called enhanced electric fluorescent in situ hybridization (EEL FISH) to detect the expression levels of hundreds of genes in tissue. However, conveying all the pertinent details of this complex technique in the methods section of a research article can be challenging. To overcome this limitation, step-by-step protocols can be provided to make the procedure easier to follow and implement. Platforms such as Protocols.io and OpenWetWare.org offer a forum for questions and comments, allowing for post-publication updates and long-term support. Communicating common pitfalls, documenting key steps with pictures or videos, and defining "obvious" steps can also enhance the accessibility and transparency of methods, making them more useful for replication and scientific research.

via Nature.com|

#eel-fish #methods-section #protocols

health2 years ago•2 min saved

New Study Reveals Omicron BA.5 Subvariant's Increased Virulence and Replication Speed

A new study in mice has found that the Omicron BA.5 variant of SARS-CoV-2 is more virulent and replicates faster than its predecessors. The study, published in Science Advances, used genetically modified mice to compare different subvariants of Omicron and found that BA.5 caused more severe illness and death, likely due to its ability to rapidly replicate early during infection. This study provides a valuable animal model for studying the new Omicron variants and understanding their behavior, as previous animal models did not exhibit illness with other variants. The findings suggest that targeting cytokines with drugs could potentially lessen symptoms and provide a treatment option.

via Times of India|

#animal-models #health #mice-study

science-and-health2 years ago•7 min saved

Unintended Impacts of Anti-Cancer Drugs: Researchers Dispute High-Profile Discoveries

Several research teams have disputed the findings of three high-profile studies that claimed tumors are filled with microbes, stating that they were unable to replicate the results and suggesting that the microbes were either mirages or the result of contamination. The authors of the original studies defended their data and pointed to more recent studies that support their conclusions. This controversy highlights the challenges of deciphering the true nature of tumor microbes and the growing pains of a promising field. While the debate continues, experts agree that microbes play a role in cancer, but the field is still searching for accurate tools and standards.

via The New York Times|

#cancer #controversy #microbes

science-and-technology2 years ago•7 min saved

Cracking the Case of LK-99: The Failed Quest for a Room-Temperature Superconductor

Scientists have determined that LK-99, a compound of copper, lead, phosphorus, and oxygen, is not a superconductor as previously claimed. The material's properties, including levitation and drops in electrical resistivity, were found to be the result of impurities, particularly copper sulfide. Replication efforts by various research teams have failed to observe room-temperature superconductivity in LK-99. The conclusion highlights the importance of careful analysis and the need for pure samples in studying material properties.

via Nature.com|

#impurities #lk-99 #material-properties

science-and-technology2 years ago•1 min saved

"Revolutionizing Ancient Technology: The Open-Source Antikythera Mechanism"

A group of creators has built an open-source replica of the Antikythera Mechanism, a 2000-year-old device considered one of the most important archaeological discoveries. The replica incorporates modern technology such as 3D printers and laser cutters, with some upgrades and changes to accommodate building in a modern workshop. The designs and schematics are open source, allowing for modifications, and various parts will be available for sale. While the ancient Greeks lacked the cosmological understanding to make the machine accurate for two thousand years, the replica remains a fascinating build, with ongoing discoveries about its functionality.

via Hackaday|

#antikythera-mechanism #archaeology #modern-workshop

science2 years ago•3 min saved

Attempts to Replicate Superconductors Yield Disappointing Results

Researchers at Nanjing University attempted to replicate a paper claiming to have created a compound that superconducts at room temperature and moderate pressures. Despite producing the same chemical, the team saw no sign of superconductivity, even at extremely low temperatures. The original research came from a lab that had an earlier paper on superconductivity retracted, and the failure to replicate will raise further questions about the original claims. The rapid publication of this report should put pressure on the original lab to cooperate and sort out any differences that might explain the lack of replication.

via Ars Technica|

#high-pressure #nanjing-university #replication