It has been discovered that species moth Galleria mellonella is capable of perceiving sounds very sharp, up to 300 kHz frequency. That makes, of all animals, in which higher-pitched sounds heard.
Humans are able to hear sounds up to 20 kHz. Anything more acute, we can not hear. And indeed, the sensitivity to high-pitched sounds decreases with age, being quite common for older people not pick up sounds sharper than 15 kHz. Even the bats, some of which can hear sounds as sharp as 200 kHz, can compete against this moth.
Hannah M. Moir (now at the University of Leeds, United Kingdom), Joseph C. Jackson and James FC Windmill, ultrasonic engineering center, attached to the University of Strathclyde in the United Kingdom, were very amazed to see that the moth is able to hear sound frequencies so acute. Read the rest of this entry »
Parkinson’s disease is a neurological condition that affects many people in the world. In the United States the number of people affected is half a million, and about 50,000 new cases are diagnosed each year.
There is no cure, so far, no sufficiently reliable method to detect the disease in its earliest stage. However, a research team has developed a novel detection method that is a major advance in the diagnosis of this disease in its early stages when treatment is more effective to alleviate the symptoms.
Parkinson’s disease, a disorder of the nervous system that affects the ability to move, appears when production ceases dopamine by nerve cells in the brain. Dopamine helps control muscle movement. Without dopamine, the nerve cells can not properly send messages, which results in a loss of muscle function. Read the rest of this entry »
In the summer of 1968 appeared a new strain of influenza in Hong Kong. This strain, known as H3N2, has spread worldwide and is estimated to reached kill a million people.
A new study reveals that there are circulating in birds and pigs, many strains of H3N2 that are genetically similar to the 1968 strain and are capable of generating a pandemic if they pass the Human Being.
The team of Ram Sasisekharan from the Massachusetts Institute of Technology (MIT) in Cambridge, United States, has concluded that current flu vaccines may be unable to offer protection against these strains. Read the rest of this entry »
Internet is very useful and can make our lives better. But as in other areas, there are some individuals, the proverbial bad apples who use it to have fun doing harm to others.
The typical school bullies can thus project their unhealthy behavior in cyberspace, to continue harassing their victims even when they are at home. In some countries, the phenomenon is reaching worrying.
According to the results of recent research in a typical American classroom instruction cycle prior to college, out of 30 students, 5 were victims of cyberbullying in the last year. Read the rest of this entry »
A study of the Faculty of Dentistry, National University (A) of Colombia establishes the utility of eggshell in tooth whitening, with benefits such as reducing costs and strengthening the enamel. “Previous studies had tested the adhesion and re-mineralization with this material. Then, we note that had teeth appear lighter after the treatment”, says Paula Vargas, the student author of the study.
Based on this data, Vargas proceeded to test the usefulness of eggshell in tooth whitening. And not only proved, but also determined that this substance strengthens the enamel against the negative effects of conventional treatment.
The student said that “over time, the more are in the saliva; these minerals are going to go looking to natural enamel”. The process begins eggshell pulverizing and mixing it with other substances to form a paste which is applied on the tooth. Over time, it forms a mineral finally polished. Read the rest of this entry »
The perception we have of the world is the result of sensory representations in our brain. This “reconstruction” is performed by electrical activation of neurons in a code that contains the information that the brain constantly processes.
To get to know what the rules governing the representation of the world in the brain is needed first insight into how the electrical activation is linked to the sensory experience.
For this reason, a team of researchers, including Mathew Diamond, Houman Safaai and Moritz von Heimendahl, International School for Advanced Studies (SISSA) in Trieste, Italy, analyzed the behavioral and neural network activation in rats while they faced tactile recognition test objects. Read the rest of this entry »
Global steel production is currently 1,500 million tons per year or so. The most common processing method produces steel from iron ore (mainly iron oxide) by heating with carbon strategy. This process, unfortunately, is carbon dioxide (CO2) as a byproduct.
The production of one ton of steel generates nearly two tons of CO2 emissions, according to figures from the steel industry, thus representing 5 percent of total emissions of greenhouse gases in the world.
Therefore, the production of steel is a major industrial source emitting greenhouse gases. The industry has had little success in finding ways to make steel that do not involve generating CO2. Read the rest of this entry »
A team of bioengineers has created for the first time artificial cardiac tissue that mimics the functionality detailed natural heart tissue and cells using human biological materials. This achievement will translate into better therapies to repair the damage caused by heart disease, a leading cause of death worldwide.
There is great interest in the medical community to find new strategies for creating artificial cardiac tissue that resemble as much as possible to natural fabrics, in terms of their physical properties and functionality. Current biomaterials used to repair the heart after myocardial other cardiovascular problems do not possess the ideal strength and functionality.
The team of Nasim Annabi and Ali Khademhosseini of BWH (Brigham and Women’s Hospital) in Boston, Massachusetts, United States, is introducing an alternative material that has mechanical properties and functionality of the natural heart woven. Read the rest of this entry »
Until recently, the only primate that was known to have the overwintering survival strategy was lemur species Cheirogaleus medius, tropical arboreal animal living in the African island of Madagascar and belongs to a genre known as dwarf lemurs.
It turns out that this is not the only lemur hibernates. As documented in a new study, which was presented publicly in recent days, the lemurs of two other little-known species of dwarf lemurs (the Cheirogaleus crossleyi and Cheirogaleus sibreei) dig a burrow in soft, spongy land of the jungle eastern Madagascar, huddle there and spend three to seven months dozing underground.
Comparing the hibernation habits of dwarf lemurs of eastern with the western part, the researchers hope to clarify which activates dormant in hibernating animals, and if the lemurs (our genetic relatives able to hibernate closest known ) perform this process differently than they do other animals. Read the rest of this entry »
Leaving home to go to work may seem an act cognitively simple, we often do almost automatically, but with each step we take, our brain works hard to create maps of the environment that allow us to cross it and remember where we are.
As we go through the first meter away from home, we passed the tree or the corner, specific neurons fire their signals. And so on to features of the environment that recognize and allow us to guide us. Thus, the brain constructs a map, which is much more accurate than we might believe.
The how neurons create these maps of our daily environment has fascinated scientists for decades. It is known that various types of stimuli influence the creation of such maps, including visual characteristics of the physical environment (such as the corner tree) body perception of how fast we move, and other stimuli, including odors (e.g. the same tree of the corner). However, it is unknown what the exact mechanisms by which groups of neurons combine these various stimuli to create accurate maps. Read the rest of this entry »