January 19, 2019

    Salmon are shrinking and this has genetic basis
    Salmon are shrinking and mature faster - life short science news

    By studying scales, collected over a 40 years period, biologists have found that male salmon are becoming smaller. It appeared that the reduced body size has a genetic basis, such that the genotype for larger body size is now less common than the genotype for smaller body size. This change in the genes shows that the change in body size reflects “evolution in action”. It seems that salmon mature faster, i.e. at a younger age, and therefore don’t grow as big as they used to do. It is not clear as to what the evolutionary benefit might be of smaller body size, but biologists hypothesize that salmon are more likely to die during their time at sea, and would thus be better off returning to the rivers to spawn earlier.

    Read the full story: University of Helsinki
    Scientific publication: Nature Ecology & Evolution

    Scientists developed a test to predict the ability of people to handle emotions at work
    New emotional intelligence test can predict employee’s abilities - latest science news in short

    Researchers developed an emotional intelligence test claimed to accurately predict the abilities of an employee for social interactions and leadership capabilities. Emotional intelligence is one’s ability to understand, recognize and manage emotions.

    The test, titled the Geneva Emotion Competence Test (GECO), consists of four different sections evaluating different aspects: understanding emotions, recognizing emotions, regulating one’s own emotions and managing other people’s emotions.

    The questionnaire was designed based on inputs from 40 managers. Then, the test was validated on more than 1,000 individuals. The importance of emotional intelligence is widely acknowledged and soon hiring managers could use this test in addition to evaluating the training and career history of a candidate.

    Read the full story: University of Geneva
    Scientific publication: Journal of Applied Psychology

    Scientists come out with recommendations for improving work meetings
    The secrets behind better workplace meetings, according to science - short daily science news

    Meetings are frequent in work organizations, whether we like it or not. However, not all of them are useful and valuable. A group of scientists analyzed almost 200 studies about workplace meetings and came out with a set of guidelines for the perfect meeting.

    In short, there are several things that need to be taken care of before, during and after a meeting. To see all the recommendations, please read the long version following the link below.

    Under ideal circumstances, meetings can provide a place for creative thinking, problem-solving, discussion, and idea generation. In reality, many employees are unhappy with them and the research showed that they spend up to 6 hours per week in meetings.

    Read the full story: ScienceBriefss
    Scientific publication: Current Directions in Psychological Science

    Our ancestors had many skeletal anomalies, likely due to inbreeding. Credit: Erik Trinkaus
    Why early humans had skeletal abnormalities - science news

    The anatomy of ancient skeletons suggests that early humans had an unusually high number of birth defects affecting the skeleton. A recent study supports the idea that this is because of frequent inbreeding among small groups, although other explanations are also possible.

    The human bones described in the study date between 2.5 million to 9,700 years B.C.E. and come from various regions around the globe. They had a very high incidence of abnormalities, many of them induced by known genetic mutations, suggesting that some of those ancient people were somehow related.

    Inbreeding could have promoted the spreading of harmful genetic mutations within the populations. Evidence based on genetic analysis of early humans also supports this hypothesis.

    Read the full story: Sciencemag
    Scientific publication: Proceedings of the National Academy of Sciences

    Two religious complexes from antique Chile offer clues about the early local civilization. Credit: copyright Antiquity Publications Ltd.
    Ancient ceremonial complexes discovered in Atacama Desert - scienc news in short - archeology

    The world’s driest desert, Atacama, offered archeologists a nice surprise in the form of two ancient ceremonial complexes one kilometer (0.62 miles) apart. The oldest of them is believed to be 5000 years old.

    The discovery shows that in the past people flourished in such harsh places, likely in regions called “eco-refuges”, places that had basic resources like water and plants. One of the sites contained impressive treasures: massive stone monuments, offerings of gold and rare materials, and infant burials.

    The discoveries suggest that early monumentalism in the Atacama may reflect the emergence of complex social organization among late hunter-gatherers.

    Read the full story: LiveScience
    Scientific publication: Antiquity

    Inflammation in the brain was associated with postpartum depression
    Immune system linked to postpartum depression - latest science news in short

    A new study showed that signs of inflammation are found in brain areas responsible for mood regulation in an animal model of postpartum depression. This suggests a link between the immune system, the brain, and depression.

    About 15% of mothers experience depression after birth. The study found that immune system changes triggered inflammation in the medial prefrontal cortex. In the animals used for the study, this was induced by a stressful pregnancy.

    “Postpartum depression is understudied and, as a result, remains poorly understood,” said the lead author. It is hoped that future research in this direction could improve the lives of women affected by the disorder.

    Read the full story: The Ohio State University
    Scientific publication: Society for Neuroscience Meeting 2018

    Dividing cells are kept in place by a newly discovered cellular structure
    New cell structure discovered - life short science news

    Cell biologists have discovered a new cell structure that plays a role in cell division. It is a protein complex that interacts with surrounding proteins to keep the cells in place when they divide. Other such complexes had already been found, but the newly discovered structure is unique in that it stays intact during cell division, whereas the others dissolve. The complex also makes sure that the daughter cells end up at their proper location after cell division. The discovery has been made using human cells, and future research has to show how the complex functions in living animals and humans.

    Read the full story: Karolinska Institutet
    Scientific publication: Nature Cell Biology

    In an urban experiment, people that received more money gave less for efforts against climate change. Credit: Universitat Rovira I Virgili
    Richer people do less to fight climate change - daily science news - environment

    A citizen science experiment that quantified how much people do to act against climate changes gave an interesting result: it appears that wealthier people are willing to do less than others.

    Participants were grouped and given a certain amount of money from which they had to contribute to efforts for climate preservation. They were allowed to keep any money that was left over. The poorer participants (that received less money at the beginning) spent more compared to richer participants (who started the experiment with higher amounts).

    The study demonstrated that cooperation within a group of participants was better than competition between individuals. Moreover, it suggests that discussing generic global climate consequences does not lead to equitable efforts to fight against it.

    Read the full story: University Rovira I Virgili
    Scientific publication: PLoS ONE

    Infections are the leading cause of crop loss, accounting for 10% worldwide
    New gene discovered that might help crops withstand infections - life short science news

    Scientists have found that the hitherto unknown gene SRG1 strengthens the immune response of plants against infections. The expression of this gene stimulated by the production of the gas nitric oxide that plants produce in tiny amounts when they are under bacterial or viral attack. This finding gives more insight in the defense of plants against infections and could help to reduce crop losses.

    Read the full story: University of Edinburgh
    Scientific publication: Nature Communications

    Robust corals synthesize histidine themselves, and do not depend on symbiotic algae for this essential amino acid
    Some corals likely to resist bleaching - life short science news

    Corals known as « robust corals » are more likely to survive bleaching than other corals, owing to their ability to synthesize an essential amino acid (histidine) themselves, a new study found. Robust corals are the only animals known to synthesize histidine, needed for the production of proteins, and not to depend for this on the algae they live with. In other corals, algae are the only source of histidine, and therefore depend on them for their survival. Therefore, unlike robust corals, the other corals (called complex corals), are more susceptible to coral bleaching (when algae disappear from the corals) and global warming.

    Read the full story: Arc Centre of Excellence - Coral Reef Studie
    Scientific publication: Genome Biology

    Hypothesized direct and indirect effects of picaridin on aquatic predators of mosquito larvae indicating a human-environment positive feedback loop. Image: Leslie Tumblety
    Widely used mosquito repellent is lethal to their predators - life short science news

    Insect repellents containing picaridin can be lethal to salamander larvae, the natural predators of mosquito larvae. A toxicity study in the laboratory with realistic concentrations of repellent in the water showed that about half of the larval salamanders in the study died within 25 days of exposure, while the mosquito larvae were unaffected. This suggests that using the picaridin-containing repellent, which enters aquatic ecosystems through sewage effluent, might in fact increase the survival of mosquito larvae, and consequently also the numbers of adult mosquitos that people want to combat with the repellent. This might constitute a feedback loop that leads to fewer salamanders and more mosquitos over time.

    Read the full story: Cary Institute of Ecosystem Studies
    Scientific publication: Biology Letters

    Showerheads harbor large numbers of bacteria, including some that could trigger lung diseases
    Showerheads contain bacteria that could trigger lung infections - daily science news in short

    Showerheads are not a very clean place, they contain several types of bacteria. A group of scientists found that the regions where pathogenic bacteria are most prevalent in showerheads are the same regions where nontuberculous mycobacteria lung infections are common.

    The study surveyed households across the United States and Europe and found that the bacterial populations differ depending on geographic location, water chemistry, and water source. Households that received water treated with chlorine disinfectants had particularly high abundances of certain mycobacteria.

    The study highlights a possible connection between mycobacteria in showerheads and lung diseases and could lead to new strategies to reduce exposure to such pathogens.

    Read the full story: American Society for Microbiology
    Scientific publication: mBio

    Sacabambaspis, a 460 million year old jawless relative of modern jawed fishes, swims in the shallow coastal waters of modern day Bolivia. Image: Nobumichi Tamura
    All fish species find their evolutionary origin in seashore environments - life science news

    Early fish types have emerged from fragile seashore environments between 480 and 360 million years ago, new data suggest. Due to the scarcity of fossils from this period, scientists adopted a big data approach, surveying more than 2,700 early records, and matched these with mathematical modeling to predict the habitat from where early fish types emerged. They found that some fish species evolved into groups with flexible body shape that were able to leave the seashores and colonize deep waters. Other, more rigid or armored species, would have had limited swimming ability, and remained in shallow waters. Some fish moved into fresh water, and others eventually reached land to give rise to the terrestrial vertebrates we know today. The study highlights the importance of shallow water for evolutionary development of fish species, and gives more reason to protect this habitat from consequences of global warming.

    Read the full story: University of Birmingham
    Scientific publication: Science

    Phidippus audax spider, with its principle eyes and two lateral eyes clearly visible. Image: Beth Jakob
    One set of spider eyes helps the other - life science news

    Biologists have figured out that spiders use their two forward-facing principle eyes can only track stimuli in their environment efficiently if they are helped by the six secondary eyes, the anteriolateral eyes. They came to this conclusion after completing experiments with a specially designed eyetracker, a tool normally used by psychiatrists to see where people are gazing while reading, driving, or watching moving objects on a screen. After gently and reversibly blinding the secondary eyes, it turned out that the principle eyes function like a torch light to see objects with great precision in a rather restricted area, so that the stimulus had to be right in front of the spider to track it. The secondary eyes direct the principle eyes to quickly locate and very accurately track disks moving at different speeds. This configuration of the visual system, in which one set of eyes depends on another set of eyes, is highly unusual and has not been observed in any animal before.

    Read the full story: UMassAmhurst
    Scientific publication: Current Biology

    Reintroduction of wolves has made Yellowstone's ecosystem dynamic and complex
    Yellowstone has benefited from the reintroduction of wolves - ecology science news

    The reintroduction of wolves in Yellowstone National Park in 1995 has made the park’s ecosystem very complex and heterogeneous, a new study shows. While human interventions in the park are kept minimal, the presence of wolves led to the recovery of a variety of plants and trees, and bison have replaced elk as the dominant herbivore in the Northern Range of the park. Yellowstone has thus benefited from the reintroduction of wolves in the park, but this success is not easy to recapitulate in other areas where the influence of human activity (agriculture, hunting, livestock) is dominant.

    Read the full story: University of Alberta
    Scientific publication: Journal of Mammalogy

    3D anatomical modeling of wheat, sunflower and tomato leaves. Image: University of Sydney/ANU
    Imaging the 3D structure of leaves - life science news

    Scientists have succeeded in imaging leaves in their three-dimensional structure by using new technology. The images are created from biological specimens, by integrating two-dimensional measurements to create the 3D pictures. The images reveal the complexity of leaves in much more detail than traditional 2D images used until now, and make it possible to better understand how water and gases flow through leaves, or how photosynthesis precisely works.

    Read the full story: University of Sydney
    Scientific publication: Trends in Plant Science

    A comparison of shells assessed during the research, with the top shell taken from waters with present-day CO22 levels and the bottom one from waters with future predicted levels. Image: Ben Harvey/University of Tsukuba
    Dissolving snails due to acidification of seawater - life science news

    Biologists have found that increased CO2 levels in seawater harms the shell of the snail Charonia lampas, or triton shell. The research was conducted off the coast of Shikinejima in Japan, where CO2 bubbles up from the seabed. This allowed the scientists to assess the effects of future high CO2 levels. The snails living in this CO2-rich area were one third smaller than the snails living in other parts of the ocean nearby, where CO2 levels are still normal. Further, high CO2 levels negatively influenced thickness, density, and structure of the shells. These effects are caused by increased stress imposed by acidification of the water, which reduces the snails’ ability to control the calcification process. The researchers conclude that increased acidification of the oceans will impact on shellfish fisheries and marine ecosystems.

    Read the full story: University of Plymouth
    Scientific publication: Frontiers in Marine Science

    A new study shows for the first time that the Atlantic salmon uses magnetic fields for navigation. Credit: Oregon State University
    Atlantic salmon uses Earth’s magnetic field for navigation - science news

    Similar to their relatives, the Pacific salmon, the Atlantic salmon uses Earth’s magnetic field as a navigational tool, according to a new study.

    Interestingly, the study showed that the fish do not lose the ability to use the magnetic field as a GPS through several generations, even after they have been transplanted into a land-locked lake.

    The use of the magnetic field explains, in part, how salmon can find the way to their river of origin. This ability does not seem to be lost when not used, as in the case of the fish confined to a small space.

    Read the full story: Oregon State University
    Scientific publication: Proceedings of the National Academy of Sciences

    Education equips people with better abilities to make high-quality choices
    Education improves economic decision-making - life science news

    Education support and laboratory experiments that mimicked real-life situations improved economic decision-making in a group of nearly 3,000 girls in secondary schools in Malawi. The students received one year of financial support, and the effects on economic choices the students made were assessed four years later. It turned out that students tried to obtain the greatest value possible from an economic decision, which is a criterion for economic rationality. Thus, education is a tool for enhancing and individual’s economic decision-making quality.

    Read the full story: Cornell University
    Scientific publication: Science

    We inherited DNA from Neanderthals that helps us to fight viral infections. Image: Claire Scully
    Our viral defenses are inherited from Neanderthals - life science news

    New research has shown that Neanderthals and modern humans interbred and exchanged viruses. The Neanderthal DNA ended up in our DNA, and helps us to protect ourselves against viruses. This DNA-based adaptation was particularly strong against RNA viruses in Europeans. Thus, before vanishing from the globe, Neanderthals gave us the genetic tools to fight viral infections.

    Read the full story: Stanford University
    Scientific publication: Cell

    Embryos created from stem cells could open new possibilities for developmental biology. Seven-day old gastruloid. Credit: Mehmet Girgin, EPFL
    Pseud-embryos from stem cells created in the lab - science news
    A new research study reports that mouse stem cells have the ability to produce pseudo-embryos, similar in many aspects to real embryos of 6 to 10 days.

    The study showed that the three main embryonic axes were formed using around 300 stem cells, according to a gene expression program similar to that of normal embryos.

    This new approach has great potential for the study of the early stages of development in mammals and could one day replace the use of real embryos in research.

    Read the full story: University of Geneva
    Scientific publication: Nature

    Studies on Lasioglossum baleicum, or sweat bee, revealed the importance of cooperation to increase fitness. Image: Norihiro Yagi
    Genetics do not contribute much to forming a social society - life science news

    Research in sweat bees (Lasioglossum baleicum) revealed that social behavior is relatively independent of genetic similarities between the individuals. Fitness, i.e. an organism’s reproductive success and propagation of its genes, is rather determined by cooperative behavior. This finding contradicts an earlier theory that stated that forming of social groups is determined by genetic relationships between individuals. Sweat bees can live both in groups with many female workers and a single queen, or as individual mothers. Individual females in social nests had a higher fitness than single mothers, and 92% of this difference could be attributed to cooperative behavior while living in a group, and only 8% to genetics. Thus, this study helps to better understand the evolution of living together in social groups, including in humans.

    Read the full story: Hokkaido University
    Scientific publication: Science Advances

    The pattern of spots is transmitted from mother giraffes to their babies
    How do baby giraffes get their spots? From their mothers! - science news headlines - animals

    The spotted pattern of a giraffe is complex and important, ensuring efficient camouflage and protection from predators. But what determines the shape of the spots?

    A new study showed that their shape is, at least in part, inhered. More precisely, most features are transmitted from mothers to calves.

    Moreover, the researchers discovered that giraffes with larger spots have increased chances of survival, thus making a link between the pattern and the efficacy of the camouflage.

    Read the full story: University of Zurich
    Scientific publication: Peer J - Life and Environment

    Ground cherries might become easier to grow after gene editing
    Making wild groundcherry suitable for agriculture by DNA editing - life science news

    To make wild groundcherry suitable for agriculture, scientists have edited its genome with the CRISPR technique to incorporate some characteristics of tomatoes. This makes the groundcherry grow in a more “organized” way so that they are easier to culture, and the plants produce more fruit. While still other changes have to be made, especially preventing the dropping of fruit to the ground before ripening, researchers think that groundcherries will soon be the next superfood, full with vitamin B and C, antioxidants, and other healthy molecules, and that groundcherries will be cultured on a larger scale in the US in the future.

    Read the full story: Boyce Thompson Institute
    Scientific publication: Nature Plants

    Cell structure of Picochlorum, isolated from the San Elijo Lagoon in California. Image: Susanne Ruemmele
    Gene stealing algae may survive climate change - life science news

    Some green algae appear to have taken genes from bacteria, which allows them to survive hostile and fluctuating conditions in salt marshes. These algae, known as Picochlorum, are expected to survive climate change as well, thanks to the bacterial genes they acquired. Such natural genetic modifications may provide important information for the engineering of algae that could one day be used as biofuels, researchers think.

    Read the full story: Rutgers University
    Scientific publication: Molecular Biology and Evolution

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