Articles tagged with Hair
Researchers discovered cortisol in Egyptian mongoose hair, providing a long-term biomarker for stress. The study's results could help monitor the impact of habitat changes on mongoose populations and their competitors, such as the Iberian lynx.
Physicists detected the ringing of a newborn black hole for the first time, confirming Einstein's theory and the idea that black holes have no 'hair.' The findings support the notion that black holes are bald-faced giants with no extraneous properties.
A study published in Communications Biology reveals that the genetic mutation responsible for black pigmentation in nonagouti mice is caused by the insertion of a retrovirus β4 into VL30. Researchers found that this mutation originated from East Asian mice related to Japanese fancy mice.
Researchers analyzed human hair fibers from polluted areas in China and found increased degradation with higher PAH levels. Exposure to UV radiation further damaged contaminated fibers, suggesting a toxic combination.
Researchers discovered a connection between cortisol levels in hair and depression risk in teens, with low cortisol levels also linked to mental health struggles. Family support was found to reduce depressive symptoms in adolescents.
A study published in the Journal of Nutrition has linked specific chemical signatures in human hair to a diet of traditional Yup'ik foods. The researchers found that changes in nitrogen isotope ratios along the hair strand correlated with increased consumption of traditional foods like fish and marine mammals.
Researchers discovered that the Venus flytrap's tactile sensors respond to minute pressure stimuli, converting them into electrical signals that cause the trap to close. The plant has evolved smaller traps to detect the smaller forces generated by lightweight mosquitoes.
A UC Santa Cruz study found that many college students are unaware of the mercury exposure risks associated with eating large amounts of tuna. Students reported consuming up to 20 servings of tuna per week, exceeding recommended levels and potentially causing neurological damage.
Researchers found zebras' black and white stripes create a temperature difference that increases as the day heats up. The strips aid in heat loss through evaporation and convection currents.
Researchers created a synthetic insulator mimicking polar bear hair's structure, which traps heat and is lightweight and water-resistant. The new material has exceptional stretchiness, making it suitable for aerospace applications.
A new study from Linköping University found that dogs and their owners share similar stress levels, with high-stress owners having high-stress dogs. The study examined 25 border collies and 33 Shetland sheepdogs and found no correlation between dog personality traits and stress levels.
A new study by UNLV researchers found that women are more likely than men to remove pubic hair in non-Western cultures, citing hygiene concerns as a primary motive. In contrast, Western societies tend to shave or wax due to the influence of pornography and product marketing.
A pilot study found pregnant women living near fracking wells in northeastern British Columbia had higher concentrations of barium, aluminium, strontium and manganese in their hair and urine compared to the general population. The study suggests that exposure to these metals could be linked to health risks for mothers and children.
Ali Gooneie simulates atoms and molecules to explain material properties like smooth surfaces, flexibility, heat-conductivity, and insulation. His research uses the finite element method to predict macroscopic properties of composite materials.
A Boston University School of Medicine study found that wearing tight-fitting jeans or pants four or more times a week doubles the risk of vulvodynia, while removing hair from the mons pubis nearly triples it. The condition affects an estimated 16% of women over their lifetimes.
Researchers at the University of Seville developed a method to produce high-filament thin polymer fibres, opening doors for industrial-scale production and various applications in material science. The filaments have diameters as small as 50 micrometres and show great elasticity.
A recent study found a gene variant in the SGK3 gene causing hairlessness in Scottish Deerhounds. The defect results in puppies born with thin fur that loses all their hair in weeks. This discovery may also provide insights into human non-hormonal baldness, as the SGK3 gene is also associated with early hair loss and baldness.
Researchers developed a new method to distinguish between drug ingestion and external contamination of hair by analyzing single hairs from volunteers. The team found that splitting the hair lengthwise increased sensitivity for zolpidem detection, allowing them to separate ingestion from contamination.
Scientists have achieved a billion-fold increase in the electrical conductivity of melanin, enabling its potential in safe and sustainable bioelectronics. The breakthrough involves heating synthetic eumelanin to produce High Vacuum Annealed Eumelanin, which shows tunable conductivity and biocompatibility.
Researchers are analyzing hair samples to study how hormones and environmental factors influence puberty. The goal is to understand the mechanisms that trigger puberty and how personal experiences shape hormone changes.
A study examines how costume changes in Star Wars female leads Padmé and Leia parallel shifts in their positions of power and romantic relationships. The researchers argue that these changes contribute to the objectification of women through costume design, highlighting the importance of considering the portrayal of women in media.
Researchers from Trinity College Dublin and St James's Hospital successfully measured vitamin D in human hair, a major step forward in assessing vitamin D status. This could provide a longer-term record of an individual's vitamin D levels, potentially allowing for better strategies to maintain stable concentrations.
Researchers at Cornell University found that mosquitoes can detect sound waves from distances of up to 10 meters, including human speech and the buzzing of female mosquitoes in flight. This discovery could lead to the development of more sensitive directional microphones and hearing aids.
A study by Lancaster University and Memorial University found that women who wear the hijab or niqab while testifying in court are perceived as more credible than uncovered women. The researchers suggest several possible explanations for this bias, including the idea that religious garments signal honesty and dispel common rape myths.
A gel-like structure in the inner ear moves according to a sound's frequency, allowing detection of faint sounds Researchers at MIT found that the size and arrangement of pores within the tectorial membrane make it highly selective, amplifying middle frequencies while reducing high and low tones
Researchers found that sunscreen chemical octocrylene (OC) accumulates in coral as toxic fatty acid esters, interfering with metabolism. Levels of OC in the ocean may have been underestimated due to the presence of these esters.
Researchers used mass spectrometry to analyze Zhu Ling's hair samples and establish a timeline of her thallium poisoning. The study found that Ling was exposed to multiple doses of thallium, with increasing frequency and concentration, over a period of four months.
A study of 350,000 people has identified eight genetic differences associated with red hair, revealing new insights into its inheritance. The research also uncovered over 200 genetic variations linked to blonde and brunette traits, including those related to hair texture and growth patterns.
A new Danish study from Aarhus University found that girls' pubertal milestones, such as breast development and acne, are occurring 3 months earlier than those of their mothers. Boys also reached several puberty benchmarks 6 months to a year earlier than in previous studies
A newly described tomato relative, Solanum kollastrum, boasts long thorns and sticky stems, but surprisingly starts as a beneficial species in its ecosystem. It's preferred by medium- to large-sized bees and has fruits that are eaten by bats.
Plant root hairs grow long by suppressing lateral cell expansion due to PI(3,5)P2 regulation. This allows for increased surface area absorption of water and nutrients from the soil. The discovery sheds light on plant cell morphogenesis and could lead to the development of more efficient nutrient-absorbing plants.
Researchers at Massachusetts General Hospital report significant hair regrowth in a 13-year-old patient with total alopecia and eczema after treatment with dupilumab. The drug's mechanism of targeting an immune system pathway overactive in eczema may also induce hair growth in other alopecia patients.
A global study standardizes FRET measurement technology to pinpoint molecular distances at the nanoscale. This breakthrough enhances understanding of molecular machines and processes that underpin life.
Researchers have successfully reversed hair loss and skin inflammation in mice fed a Western diet high in fat and cholesterol. The experimental compound D-PDMP halts the production of glycosphingolipids, which are major components of skin and cell membranes.
A new study found that measuring ethyl sulphate in hair can assess alcohol consumption and detect a wider time frame of drinking behavior. Researchers successfully applied this method to patients with alcohol use disorders, highlighting the potential of hair as a non-invasive testing matrix.
Researchers developed a natural, non-toxic hair dye from blackcurrant skins that is as durable as conventional dyes and retains color through multiple washings. The dye's anthocyanin-based formula shows promise in addressing environmental concerns and potential health risks associated with traditional hair coloring.
Researchers at the University of Leeds have developed a new technology to extract anthocyanins from blackcurrant fruit waste for use in renewable dyes. The resulting hair dye is non-toxic, water-soluble and provides great colour results with minimal potential risks.
A new tool can predict a person's eye, hair, and skin color from a small DNA sample, providing a physical description. The HIrisPlex-S system is capable of predicting all three pigment traits simultaneously using freely available webtool.
Researchers discovered a connection between genes controlling hair color and innate immune response in mice. Gray hair is associated with activation of the innate immune system, which produces signaling molecules to fight off viruses and bacteria.
A new report by Silent Spring Institute finds that dozens of hazardous chemicals are present in hair products marketed at Black women, including hormone-disrupting chemicals and fragrance chemicals. The study highlights the need for better disclosure of ingredients and encourages manufacturers to develop safer products.
A team of scientists discovered 124 genes involved in determining human hair color variation, explaining a substantial fraction of hair color variation and heritability. The new findings have implications for conditions linked to pigmentation, such as skin, testicular, prostate, and ovarian cancers.
A Northwestern University team has developed a new hair dye using graphene that is non-toxic and non-damaging to hair. The dye works as well as commercial permanent dyes without chemically altering hairs, and it also offers anti-static properties.
Researchers have developed a graphene-based hair dye that adheres to the surface of hair, forming a coating resistant to at least 30 washes without chemicals. This coating also dissipates static electricity, eliminating flyaways.
The Endocrine Society Clinical Practice Guideline examines causes and treatments for hirsutism, a condition where women experience unwanted hair growth. The guideline recommends testing for polycystic ovary syndrome (PCOS) and other underlying health problems in all women with unwanted dark or coarse hair.
Researchers discovered a fossilized hair from a goat dated back to the Neolithic Corded Ware period, shedding new light on mortuary practices and animal husbandry of the culture. The find supports evidence that domestic animals were kept during this time period in Finland.
Researchers at UC San Diego and UC Berkeley developed a method that dramatically improves the simulation of fur in computers, using subsurface scattering to mimic how light interacts with fur fibers. The new algorithm is 10 times faster than existing models and produces more realistic simulations.
Scientists at Rockefeller University have identified a molecule called Daple that helps construct and align the sensory hair bundles in the inner ear. These bundles are crucial for detecting sound, motion, and spatial orientation.
Researchers at MIT developed a mathematical model to describe the relationship between hairy surface dimensions, dipping speed, and fluid properties. The model predicts optimal fluid entrainment for hairy-tongued nectar feeders like bats, honeybees, and possums.
Researchers created the largest publicly available chemical database of hair dye substances to develop new, safer hair colors. The database reveals promising approaches for reducing allergic reactions and cancer risk associated with permanent hair dyes.
A new humanitarian program for war-affected youth has been shown to reduce cortisol levels by 38%, a key indicator of stress. The program, Advancing Adolescents, improved the mental health of adolescents affected by the Syrian war and had a physiological benefit.
Scientists at Bonn University have found that plants use minute spines of extremely hard calcium phosphate to defend against herbivorous insects, such as aphids. This unique biomineral is widespread in plant species and can deter many types of insects from damaging the plants.
A Pediatric Pulmonology study of 376 infants found that increasing hair nicotine levels were associated with prior parent-reported smoking exposure and potential increased risks of wheeze and asthma. Higher levels of hair nicotine were also linked to smoking in pregnancy, although associations at older ages were non-significant.
New species of microbes named Pseudotrichonympha leei, lifesoni, and pearti are found in termites' guts and have long flagella resembling Geddy Lee's hair. The microbes also exhibit rhythmic movements, prompting researchers to name them after Rush musicians.
A Russian researcher and his colleagues have determined the normal range of boron in human tissues, revealing its importance in metabolism. The study found that men and women have different dietary balances but similar boron functions, suggesting a gender-independent metabolism.
A new study compares celebrities from People magazine's World's Most Beautiful lists in 1990 and 2017, revealing increased representation of darker skin types and older age groups. The researchers found that traditional beauty standards are evolving as people become more exposed to diverse cultures and media influences.
Researchers at Berkeley Lab have found a way to reversibly change the atomic structure of a 2-D material by injecting electrons, using far less energy than current methods. This process has potential for new electronic memory and low-power switching in ultra-thin devices.
Neandertal DNA has been linked to various human characteristics, including skin tone, hair color, and sleep patterns. The study suggests that sun exposure plays a crucial role in shaping these traits, with Neandertal genes contributing to lighter or darker skin tones.
A team of chemists has developed particles that can form endless architectures from a handful of basic pieces, self-assembling without human intervention. This technology enables the creation of microscopic building blocks with on-board instruction manuals, mimicking nature's manufacturing technology.
Researchers develop eco-friendly leather processing method using molten salts to remove hair and open fibers, reducing pollution output and treatment time. The new process eliminates the use of harsh chemicals like lime and sodium sulfide.
Przewalski's horses have shifted their diet from desert shrubs and leaves in winter to herbaceous plants at all seasons, unlike their ancestors in the past. This change occurred after humans expelled them from steppe communities and forced them into near-desert habitats.