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Emotional tears in dogs during reunion with owner

Human sometimes show tearing in response to emotional arousal, but emotional-elicit tearing in animals has not been clearly demonstrated. Tear secretion increased significantly during reunions with the owner, and oxytocin, a social bonding hormone, administration increased tear secretion in dogs. Moreover, photos of a tearing dog attracted human caregiving behavior. This report shows that dogs secrete emotion-elicit tears, and these tears can facilitate human-dog emotional connections.

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Top Videos

Dolphins Learn Foraging Skill “Shelling” from Peers

Dolphins in Shark Bay, Western Australia, use empty giant gastropod shells to trap prey. Wild et al. integrate genetic, behavioral, and environmental data in a network-based diffusion analysis to show that “shelling” spreads socially among associates. This study provides the first quantitative evidence for non-vertical cultural transmission of foraging behavior in toothed whales.

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Research in Action

How unfit cells are extruded from epithelial tissues

Atieh et al. study apoptotic extrusion of damaged cells in zebrafish larvae, a process that maintains epithelium homeostasis. They find that caspase activation induces pulsatile contractions via the actin-myosin network, generating localized physical forces that remove defective cells. F-actin is labelled in green. MTZ: a prodrug converted into poison by a bacteria enzyme labelled in magenta. Cytochalasin: an inhibitor of actin polymerization.

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Congratulations to the winners of the 2021 Nikon Small World in Motion Competition. Enjoy a selection of the winning videos below.

First place

Microfauna in a termite gut

Fabian J. Weston

View on Nikon Site

Second place

10-day time-lapse of an engineered human micro-tumor forming and metastasizing

Drs. Stephanie Hachey and Christopher Hughe

View on Nikon site

Third place

Water flea (Daphnia pulex) giving birth to cubs

Andrei Savitsky

View on Nikon Site

Latest videos from Cell

Blood cells drive brain development

A new study demonstrates that white blood cells enter the brain shortly before birth, triggering the final stage of brain development and maturation.

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Nucleosome Clutches

Using STORM microscopy, Cosma and colleagues find that nucleosomes associate in discrete clutches along the chromatin fiber and clutch size correlates with cell identity.

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Cancer mystery goes up in smoke

Metabolic fingerprinting using the iKnife offers near real-time diagnosis of PIK3CA mutant breast cancers and connects oncogenic PIK3CA with enhanced arachidonic acid metabolism, unveiling a "drug & diet" vulnerability.

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Latest videos from Neuron

Linking Space and Reward in a Hippocampal-Accumbens Network

Using simultaneous multi-region recordings in rats, Sosa et al. reveal distinct networks of NAc neurons engaged during dorsal versus ventral hippocampal memory processes. NAc neurons encoding spatial and reward information are activated only by the dorsal, and not ventral, hippocampus.

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Understanding Speech Prediction Using AI and MEG

Neuroscientist Peter Donhauser describes how he and his colleagues trained a neural network to predict speech, then used it to estimate uncertainty and surprise of natural speech as factors that could explain neurophysiological activity in human listeners.

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Imaging the Birth of Functional Perisomatic Inhibition

In this video abstract, Rosa Cossart and her lab members Laura Modol-Vidal and Yannick Bollmann explain how they were able to image the development of perisomatic inhibition in the barrel cortex by combining expertise in imaging, neuroanatomy, and data mining.

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Latest videos from Current Biology

Stone tools improve diet quality in wild monkeys

Tool use increased diet quality of wild bearded capuchin monkeys in two ways. First, it provided a more tightly balanced mix of macronutrients, rich in energy-providing fat and carbohydrate. Second, the macronutrient mix was more concentrated than on non-tooling days because it had less nutrient-diluting fiber. Reduced fiber not only increases the concentration of nutrients in the food, but also increases the efficiency with which they are absorbed from the gut.

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Viral-induced flexible wood

The paper describes how the symptoms of apple rubbery wood disease are induced by the virus. Symptoms arise by a decrease in lignin deposition in the fibers. This decrease is a result of the plant’s downregulation of a key step in the lignin biosynthesis pathway induced by small RNAs. This is remarkably similar to how genetic engineering has been used to alter the lignin biosynthesis pathway of trees in order to improve their properties for biofuels or the generation of novel materials.

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No cranial absorption of shocks in woodpeckers

High-speed video analyses and biomechanical models show that woodpeckers are adapted to minimize the absorption of shocks by their cranial skeleton. By functioning as a stiff hammer during pecking, woodpeckers optimize their pecking performance while their brains still do not experience impact decelerations that are likely to cause concussions.

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Latest videos from One Earth

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