Single-cell RNA-sequencing technology gives access to cell cycle dynamics without externally perturbing the cell. Here the authors present DeepCycle, a robust deep learning method to infer the cell cycle state in single cells from scRNA-seq data.
The world’s smallest remote-controlled walking robot, measuring just half a millimetre wide, has been demonstrated by Northwestern University. Its potential applications include the clearing of blocked arteries.
A team of researchers affiliated with multiple institutions in the U.S. and one in Japan has developed a new type of vaccine that helps the immune system destroy cancerous tumors by overcoming their defense system. In their paper published in the journal Nature, the group describes the new vaccine and its effects in mouse and rhesus macaque models.
Until recently, the only tools available to doctors treating cancer patients have been chemotherapy, radiation treatment and surgery. More recently, medical researchers have been exploring vaccines in the fight against cancer—the development of a vaccine against HPV-related diseases, for example, has reduced the risks of cervical and other types of cancers. Other research efforts have involved targeting peptide antigens and have proven to be effective, but only in limited circumstances. In this new effort, the researchers developed a more generalized vaccine that they believe can be used against multiple types of cancers in many types of cancer patients.
The new vaccine works by taking away one of the major defense strategies used by tumors, which is the ability to cleave T cells and natural killer cells from their surfaces. Such cells are deployed when the body detects a growing tumor and alerts the immune system. By shedding them after they affix themselves to MICA and MICB proteins on their surface, tumors are free to grow. The new vaccine works by interceding in the cleaving process, preventing the tumor from shedding the immune cells sent to kill it. The vaccine disrupts this cleaving process by increasing the density of proteins on the surface of tumor cells, which the researchers describe as “inciting protective immunity.”
How psilocybin evolved has more to do with sending insects on terrifying trips than it does making Phish sound good.
Once the tiny, iron-based particles are added to the water, the lithium is drawn out of the water and binds to them. Then with the help of a magnet, the nanoparticles can be collected in just minutes with the lithium hitching a ride, no longer suspended in the liquid and ready for easy extraction. After the lithium is extracted, the recharged nanoparticles can be used again.
New approach uses magnetic nanoparticles to extract valuable rare earth elements from geothermal fluids.
Continue reading “Researchers ‘magically’ mining metals from water” »
For instance, continuous-variable (CV) QKD has its own distinct advantages at a metropolitan distance36,37 due to the use of common components of coherent optical communication technology. In addition, the homodyne38 or heterodyne39 measurements used by CV-QKD have inherent extraordinary spectral filtering capabilities, which allows the crosstalk in wavelength division multiplexing (WDM) channels to be effectively suppressed. Therefore, hundreds of QKD channels may be integrated into a single optical fiber and can be cotransmitted with classic data channels. This allows QKD channels to be more effectively integrated into existing communication networks. In CV-QKD, discrete modulation technology has attracted much attention31,40,41,42,43,44,45,46,47,48,49,50 because of its ability to reduce the requirements for modulation devices. However, due to the lack of symmetry, the security proof of discrete modulation CV-QKD also mainly relies on numerical methods43,44,45,46,47,48,51.
Unfortunately, calculating a secure key rate by numerical methods requires minimizing a convex function over all eavesdropping attacks related with the experimental data52,53. The efficiency of this optimization depends on the number of parameters of the QKD protocol. For example, in discrete modulation CV-QKD, the number of parameters is generally \(1000–3000\) depending on the different choices of cutoff photon numbers44. This leads to the corresponding optimization possibly taking minutes or even hours51. Therefore, it is especially important to develop tools for calculating the key rate that are more efficient than numerical methods.
In this work, we take the homodyne detection discrete-modulated CV-QKD44 as an example to construct a neural network capable of predicting the secure key rate for the purpose of saving time and resource consumption. We apply our neural network to a test set obtained at different excess noises and distances. Excellent accuracy and time savings are observed after adjusting the hyperparameters. Importantly, the predicted key rates are highly likely to be secure. Note that our method is versatile and can be extended to quickly calculate the complex secure key rates of various other unstructured quantum key distribution protocols. Through some open source deep learning frameworks for on-device inference, such as TensorFlow Lite54, our model can also be easily deployed on devices at the edge of the network, such as mobile devices, embedded Linux or microcontrollers.
Amazon and Max Planck Society announced the formation of a Science Hub—a collaboration that marks the first Amazon Science Hub to exist outside the United State… See more.
Amazon and Max Planck Society (also known as Max-Planck-Gesellschaft or MPG) today announced the formation of a Science Hub. The collaboration marks the first Amazon Science Hub to exist outside the United States and will focus on advancing artificial intelligence research and development throughout Germany.
The hub’s goal is to advance the frontiers of AI, computer vision, and machine learning research to ensure that research is creating solutions whose benefits are shared broadly across all sectors of society. To achieve that end, the collaboration will include sponsored research; open research; industrial fellowships co-supervised by Max Planck and Amazon; and community events funding to enrich the MPG and Amazon research communities.
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Microsoft security researchers have found high severity vulnerabilities in a framework used by Android apps from multiple large international mobile service providers.
The researchers found these vulnerabilities (tracked as CVE-2021–42598, CVE-2021–42599, CVE-2021–42600, and CVE-2021–42601) in a mobile framework owned by mce Systems exposing users to command injection and privilege escalation attacks.
The vulnerable apps have millions of downloads on Google’s Play Store and come pre-installed as system applications on devices bought from affected telecommunications operators, including AT&T, TELUS, Rogers Communications, Bell Canada, and Freedom Mobile.
An asteroid mining firm, Astroforge, just had its ambitions to mine the first asteroid by the end of the decade, boosted by a new round of funding.
The Y Combinator startup closed a $13 million seed round, according to TechCrunch, and the money will help it carry out its first two key goals, including a demonstration flight launched aboard a SpaceX Falcon 9 rideshare mission next year.
(2022). Journal of Experimental & Theoretical Artificial Intelligence. Ahead of Print.
AI has for decades attempted to code commonsense concepts, e.g., in knowledge bases, but struggled to generalise the coded concepts to all the situations a human would naturally generalise them to, and struggled to understand the natural and obvious consequences of what it has been told. This led to brittle systems that did not cope well with situations beyond what their designers envisaged. John McCarthy (1968) said ‘a program has common sense if it automatically deduces for itself a sufficiently wide class of immediate consequences of anything it is told and what it already knows’; that is a problem that has still not been solved. Dreifus (1998) estimated that ‘Common sense is knowing maybe 30 or 50 million things about the world and having them represented so that when something happens, you can make analogies with others’. Minsky presciently noted that common sense would require the capability to make analogical matches between knowledge and events in the world, and furthermore that a special representation of knowledge would be required to facilitate those analogies. We can see the importance of analogies for common sense in the way that basic concepts are borrowed, e.g., the tail of an animal, or the tail of a capital ‘Q’, or the tail-end of a temporally extended event (see also examples of ‘contain’, ‘on’, in Sec. 5.3.1). More than this, for known facts, such as ‘a string can pull but not push an object’, an AI system needs to automatically deduce (by analogy) that a cloth, sheet, or ribbon, can behave analogously to the string. For the fact ‘a stone can break a window’, the system must deduce that any similarly heavy and hard object is likely to break any similarly fragile material. Using the language of Sec. 5.2.1, each of these known facts needs to be treated as a schema,14 and then applied by analogy to new cases.
Projection is a mechanism that can find analogies (see Sec. 5.3.1) and hence could bridge the gap between models of commonsense concepts (i.e., not the entangled knowledge in word embeddings learnt from language corpora) and text or visual or sensorimotor input. To facilitate this, concepts should be represented by hierarchical compositional models, with higher levels describing relations among elements in the lower-level components (for reasons discussed in Sec. 6.1). There needs to be an explicit symbolic handle on these subcomponents; i.e., they cannot be entangled in a complex network. For visual object recognition, a concept can simply be a set of spatial relations among component features, but higher concepts require a complex model involving multiple types of relations, partial physics theories, and causality. Secs. 5.2 and 5.3 give a hint of what these concepts may look like, but a full example requires a further paper.
Continue reading “Projection: a mechanism for human-like reasoning in Artificial Intelligence” »
