Fungus-farming termites cultivated fungi as a food source inside their nests, with the relationship representing an impressive example of mutualistic symbiosis. Researchers suggest that termite agriculture originated in the African rainforest and gave rise to various fungus-cultivating termite species.
Researchers found that audiovisual integration of speech is severely reduced when observers perform a difficult task, even when the talker is clearly visible and audible. This challenges previous claims that multisensory integration occurs without attention, implying a need for attentional resources for cross-sensory binding.
Researchers found that monarch butterflies rely on ultraviolet light for navigation and that this process is linked to their circadian clock. The study revealed the importance of polarized light in guiding butterfly migration.
Studies in mice with genetically engineered mutant huntingtin protein found that widespread production led to locomotor problems, neurodegeneration, and abnormal brain connections. Conversely, restricted production showed little difference from normal mice, suggesting cellular interactions play a significant role in HD pathogenesis.
A study published in Developmental Cell identifies two genes, HES-1 and HLF, that regulate human blood stem cell behavior. These genes enhance cell-cycle progression and inhibit premature cell death in hematopoietic stem cells.
Researchers identified genes required for stem cell function and regeneration in planarians, providing insights into human development and health. The study used RNA interference to analyze gene function in intact animals and on proliferation of adult stem cells.
Researchers discovered a new species of coral-reef pygmy goby that lives for just 59 days, with daily mortality rates as high as 8%. The tiny fish lays only three clutches of eggs in its lifetime, contributing to the complex and hectic life cycle of reef fish.
Researchers discovered that yellow-beaked cleaner shrimp perform a specialized dance, the 'rocking dance,' to attract hungry client fish. This signaling allows both species to benefit from non-predatory cleaning interactions.
The Entamoeba mitosome, a human parasite's organelle, contains a single type of protein that imports and exports chemicals. This streamlined organelle may represent the simplest mitochondrion yet described, offering insights into eukaryotic cell function.
Studies found that mice conditioned to associate beeps with safety showed reduced 'freeze' responses and increased exploration, suggesting a neural overlap between safety and danger processing. The researchers suggest that targeting these mechanisms could lead to new treatments for psychiatric disorders involving anxiety and addiction.
Researchers identify basal forebrain cholinergic system as essential substrate for cortical plasticity and functional recovery after focal cortical injury. The study found that rats lacking a cholinergic system recovered only about 18% of their reaching ability after rehabilitation training.
Researchers found that chemokines CCL19 and CCL21 induce DC maturation and enhance T-cell proliferation. Mice lacking these chemokines showed partially activated DCs, highlighting their crucial role in full maturation and proper T-cell activation.
A recent study identified specific genetic signatures associated with treatment failure and chemotherapeutic cross-resistance in pediatric leukemia. The researchers found that expression of certain genes was linked to inferior treatment outcomes, providing new targets for overcoming de novo multiple-drug resistance.
A study found that an ancient enzyme, GCN2 kinase, plays a crucial role in guiding healthy eating behavior in mammals. The enzyme detects changes in blood amino acid levels and triggers a behavioral response to limit consumption of imbalanced food.
Research finds hypocretin neurons, involved in arousal and appetite, have an unorthodox organization that may contribute to insomnia and obesity. The discovery offers clues to the underlying mechanism of their association.
Researchers found that whooping cranes exhibit high-amplitude head movements to control their visual world while searching for food. By holding the head still more than 50% of the time, they permit close and stable examination of objects in view, allowing accurate detection, localization, and recognition of food items.
A team of researchers has discovered a neural mechanism related to impulsive decision-making in pigeons. The study found that single neurons in the avian forebrain show increased activity when anticipating rewards, with activation levels decreasing as delays increase, leading to preferences for immediate over delayed rewards. This brea...
Researchers have demonstrated that NMDA receptors are actively needed for both associative learning and long-term memory. Disrupting the receptor resulted in difficulties with learning to associate an odor with a footshock, but not with initial learning through training.
Researchers find specific shapes of amyloid fibrils, not amino acid sequences, determine prion infectivity across species. This breakthrough offers insights into the mechanisms behind prion diseases and potential transmission between previously separate animals.
Researchers use genetically engineered flies to demonstrate controlled neural manipulation, offering a promising approach for studying behavior and potentially treating neurological disorders. The system involves triggering molecular lock-and-key interactions with laser light, enabling precise activation of specific nerve cells.
Researchers found that subjects who watched a video of someone learning to navigate a robotic device improved their own performance when faced with similar challenges. However, the benefits of observation were diminished when performing unrelated arm movements during observation.
Researchers found that SSRIs increase serotonin levels in synapses, but also 'trick' dopamine transporters into retrieving serotonin, causing cosignaling. This complex effect may explain delayed antianxiety effects and behavioral abnormalities in children.
A study by Clifford and Harris found that an 'invisible' image can influence the appearance of an image in the other eye, suggesting signals from the invisible image travel to the brain's occipital lobe. This challenges the long-held belief that the occipital lobe is the seat of visual consciousness.
Research shows that contemporary irrigation projects have diverted river basins, introducing excess fresh water that disrupts mangrove tree species composition and ethnobiological relationships. Early detection of such changes is essential for preventing further mangrove degradation and protecting vital ecosystems.
Symbiotic plant hemoglobins facilitate oxygen transport and energy metabolism in legume root nodules, allowing bacteria to fix atmospheric nitrogen. The proteins also maintain low-oxygen concentrations to protect the nitrogenase enzyme complex responsible for symbiotic nitrogen fixation.
Aplysia sea slugs release an inky secretion that activates feeding pathways in spiny lobsters, stimulating grooming and avoidance behaviors. This novel defense strategy, called phagomimicry, enhances the effectiveness of the slug's escape by distracting the lobster with misleading cues.
The study found that synesthetes' colors help them distinguish shapes, but are less effective than real colors. The research suggests that synesthetic colors lead to improved behavioral performance similar to real colors.
Scientists have identified several genes that appear to be switched on by lithium, which may lead to the development of more effective treatments for bipolar disorder. The study found that one gene, GPR88, is associated with a rat model of mania and codes for an orphan receptor that could potentially target dopamine signaling.
Researchers found that phagocytes reduce IL-23 production after ingesting apoptotic neutrophils, leading to decreased inflammatory response. Abnormal neutrophils with impaired migration resulted in elevated IL-23 and IL-17 levels.
Researchers discover that lanosterol stimulates the degradation of cholesterol-building enzyme HMG CoA reductase, controlling cellular cholesterol production. This finding has important clinical implications for improving cholesterol control in statin therapy.
Researchers at Children's Hospital Boston and Harvard Medical School found that ferroportin is the major iron exporter in key sites of absorption and release. This protein's loss of control may lead to excessive iron accumulation in tissues, causing hereditary disease hemochromatosis.
Researchers discover ON01910, a non-ATP-competitive small molecule inhibitor of Plk1, arrests cell division in human cancer cells and inhibits a variety of tumors. Clinical studies are currently underway to determine the best way to utilize this potent anticancer agent.
Researchers discovered that DJ-1 negatively regulates PTEN function, suggesting a potential link between high DJ-1 levels and enhanced cancer cell survival. Elevated DJ-1 levels were associated with poor prognosis in lung cancer patients and may serve as a prognostic marker for cancer patients.
Researchers discovered BIM accumulation is crucial for paclitaxel-induced apoptosis, while H-ras/MAPK pathway suppresses it. Cotreatment with proteosome inhibitors restored BIM accumulation, enabling tumor regression. This study highlights the importance of understanding signaling mechanisms to guide rational combination therapy.
Research found that enriched mice had lower levels of b-amyloid peptides, which form toxic brain tangles in Alzheimer's disease. The enrichment act as a protective factor, keeping peptide levels low before they can aggregate and cause problems.
Research suggests that geographic distance from East Africa is a strong predictor of human genetic diversity, supporting the Recent African Origin model. Populations further away from Ethiopia display lower genetic variability, indicating a progressive loss of neutral genetic diversity as new areas were colonized.
Researchers discovered a symbiotic relationship between a wasp species and a new bacterial species that protects against pathogenic fungi. The European beewolf's larvae benefit from the antibiotics produced by the Streptomyces bacteria, leading to increased survival rates.
In a groundbreaking study, rhesus monkeys demonstrated the ability to assess visual perspectives of others during competitive interactions for food. By considering whether a competitor could or couldn't see them, monkeys made strategic decisions to maximize their chances of acquiring food.
Phage nucleic acid transport poses a fascinating biophysical problem. Researchers used fluorescently labeled phage DNA to investigate the dynamics of DNA ejection from single phages, demonstrating that release is not an all-or-none process but rather a complex and stepwise process.
Researchers found that lithium-based drugs restored normal courtship behavior in mutant fruit flies with Fragile X syndrome, suggesting a potential new approach to treating the condition. The study also identified metabotropic glutamate receptor hyperactivity as a key contributor to the disease's symptoms.
A six-month study led by Helen Mayberg found that deep brain stimulation improved mood and reduced symptoms in severely depressed patients, with three achieving remission. The procedure was well-tolerated, with no psychological side effects reported.
A study led by Drs. Dennis R. Burton and Ian A. Wilson identified the specific amino acids on gp41 that 4E10 interacts with, revealing its unique ability to target a conserved region near the surface of the virus. This research advances the quest for an HIV-1 vaccine, providing valuable insights into broadly neutralizing antibodies.
Researchers have discovered that an ancient olfaction protein is shared by many insects, including fruit flies, medflies, and mosquitoes. This finding suggests a high degree of evolutionary conservation of the protein's function in detecting odors, which could be exploited for developing novel pest control methods.
Researchers found that a person's specific allele of a single bitter-taste-receptor gene determines their perceptual sensitivity to PTC and related compounds. This suggests that genetic variations play a dominant role in determining individual differences in bitter-taste perception.
Researchers found that brain center's neurons encoded learning associated with taste stimuli, revealing different circuitry for processing rewarding and aversive stimuli. The study supports the idea that individual NAc neurons play a role in aversion and Pavlovian learning.
Researchers discovered a single genetic difference between rats susceptible and resistant to apomorphine, leading to reduced activity of the g-secretase enzyme. This imbalance was found to be associated with behavioral differences in the rats.
Researchers discovered that mice lacking two related fatty acid binding proteins exhibit striking changes in their lipid profiles and strong resistance to diet-induced obesity and other conditions. The proteins appear to play a crucial role in integrating metabolic and inflammatory responses underlying metabolic syndrome.
Researchers discovered that inserting human UCP2 into fly nerve cells extended lifespan by 28% in females and 11% in males. The increased mitochondrial uncoupling led to reduced ROS production and oxidative damage, without affecting reproductive or physical activity levels.
Researchers have developed a new compound, AMN107, that effectively blocks proliferation of Bcr-Abl dependent cells in CML patients. The drug has been shown to inhibit growth of cells expressing resistant mutants and prolongs survival in imatinib-resistant CML mouse models.
A mouse model of leukemia reveals a causal link between Shp2 mutations and leukemia, pointing to these mutants as attractive therapeutic targets. The study's findings suggest that current treatments are often ineffective and highlight the need for clinical trials of Ras/Mek inhibitors.