All biological molecules have the capacity to exist as L-forms (“left handed”) or dextrorotatory (“right-handed”). All sugars in biology consist of dextrorotatory molecules, and all amino acids that comprise the peptides and proteins are levorotatory.

The team of Paul Clarke at the University of York, which also included specialists from the University of Nottingham, both in the UK, found that using simple left-handed amino acids to catalyze the formation of sugars occurred predominantly right-handed forms. This could explain how it originated and why carbohydrates right-handed forms are dominant in nature.

There are many fundamental questions about the origin of life for which there is still no response, and many people believe that such questions addressed issues specific to biology. However, as Clarke points out, to make possible the emergence of life, it first needed a process that would make that transition as ambiguous as fascinating is the passing of an inanimate object to one that has life, something that definitely had to be a chemical process.

The authors of the new research have succeeded; ultimately, generate these two sugars threose and erythrose, from a very simple set of materials, which most scientists believe existed at the time when life began.

The technological feat is the work of a team of scientists from IBM and the Center for Free-Electron Laser Science (CFEL) in German. This unique unit of data storage was built atom by Atom with the help of a scanning tunneling microscope in the IBM Almaden Research Center in San Jose, California.

The team of Sebastian Loth of CFEL and Andreas Heinrich of IBM built the regular patterns of iron atoms, aligning them in rows of six atoms each. Two rows are sufficient to store one bit.

A byte, in turn, consists of eight pairs of rows of atoms. Use only an area of 4 to 16 nanometers. This corresponds to a storage density which is one hundred times higher than in a modern hard disk drive.

Data are written and read in the unity nanometer of storage with the help of a scanning tunneling microscope. The atoms rows peers have two possible magnetic states, representing the two values, 0 and 1, of a classical bit. An electrical pulse from the tip of the scanning tunneling microscope reverses the magnetic configuration. A weak pulse can read the settings, but now the “head” reading is stable only to a very cold temperature: 268 degrees Celsius.

2,400 million years ago came the first cyanobacteria capable of yielding oxygen in photosynthesis. From that moment all the agencies had to learn to live with what at that time was a poisonous gas that supports life today.

Now an international team of experts reveals how 1,600 million years ago, a eukaryotic microorganism was first able to produce oxygen exploiting sunlight. According to the research, published in the latest issue of the journal Science, could be the original ancestor descended all plants and algae.

The study reveals that a change occurred in a micro-organism of the Kingdom Protista, which together with fungi, animals and plants make up the eukaryotic domain. This protist captured prokaryotic cyanobacteria. This process, known as primary endosymbiosis, plastid arose, a cellular organelle where photosynthesis takes place and is now found in plants and algae.

In their paper, the researchers provide evidence that describe how all the plastids may be descended from a single primary endosymbiosis process.

To obtain these findings, the experts team led from the Rutgers University (USA), analyzed the DNA in the major of a primitive algae known as Cyanophora paradoxa, and compared it with the genomes of belonging to other terrestrial plants plastid already different red and green algae.

The species C. paradoxa belongs to glaucophyta, along with red and green algae and plants, constitute the first group of photosynthetic eukaryotes, according to research, inhabited the planet and formed the kingdom Plantae.

The researchers believe they will be able to find what unites all algae and plants and also the main characteristics that differentiate them and the genes responsible for these distinctions. Collaborated in the research were 21 universities and research centers in the U.S., Korea, Canada, Germany, Austria and France.

This important discovery, made by an international team of experts during a geological survey in the desert of Namibia, Africa, could roll back many tens of millions of years the date of appearance of animal life on Earth.

The discovery appears to be the oldest animal fossils found to date was conducted by the Bob Brain, Ditsong Museum in South Africa, along with Tony Prave from the University of St Andrews in the UK, and Karl-Heinz Hoffmann of the Geological Survey of Namibia. The finding did in ancient rocks of the Etosha National Park.

Geologists Donald Herd and Stuart Allison, University of St Andrews played a key role in the discovery and subsequent analysis of the fossil animal, like a sponge and a sub-millimeter size.

With an antiquity that could be up to 760 million years, the remains found are those of several individuals of the same species and age. The appearance of these beings is the empty fields with openings of different sizes in your body. These openings were used probably for the passage of nutrients into the body and waste products out. The researchers also found a network of internal canals that perhaps it was a primitive gut.

The agency, which has been called Otavia antiqua, might have a similar lifestyle in some respects to current marine sponges. In fact, the place where he lived was by sea. The rocks where the fossils have been found at that time were in contact with seawater.

The era in which these creatures lived was very hostile, as it is believed that at that time prevailed succession of interglacial eras, which imposed severe climate changes to existing life forms. It is believed that these interglacial eras are characterized by a state of our world sometimes defined as “Snowball Earth”. The hypothesis of Snowball Earth posits that the Earth over millions of years was covered from pole to pole by a thick layer of ice.

Before the discovery of fossils of Otavia antiqua, it was believed that the first animals appeared about 600 to 650 million years. However, the discovery of the Otavia antiqua, and the maximum age that is estimated, consistent with predictions on the approximate date of emergence of animal life based on findings made by geneticists in their research on the “watches” or molecular “calendars” of other species. Analyzing the current machinery of life, it is possible to deduce when and how each piece came about.

To avoid the devastating insect pests that cause serious crop losses, the International Rice Research Institute (IRRI), an organization composed of experts from many countries and based in the Philippines, has called world in an international conference on this subject, recently held in Hanoi, Vietnam, to promote the biodiversity of the natural predators of insects that are harmful to the rice fields, and a ban on certain insecticides that kill indiscriminately, even those natural predators.

This appeal is part of the new plan of action that the institute has designed to reduce the damage of herbivorous insects in the Superfamily Fulgoroidea cause rice yields in Asia, where much of the cultivated rice in the world.

Insects cause considerable damage Fulgoroidea by sucking the sap of rice plants, which they wither and die. They also convey three important viral diseases that stunt the plants and prevent the formation of grains of rice. The massive proliferation of these insects is often promoted by disturbances in the natural balance of ecosystems.

Spiders do not have the sympathy of many people, but are beneficial to agriculture because they carry on free and clean sentinels that keep insects at bay intruders seeking to feed on crops. Spiders and other predators that feed on beneficial insects herbivores are part of a natural system that keeps the populations of these insects below dangerous levels. When this natural balance is disturbed, a common consequence is the emergence of insect pests Fulgoroidea.

Many animals prey on beneficial insects Fulgoroidea die accidentally when insecticides are used improperly or indiscriminately. Similarly, get three crops of rice per year or use the same varieties in a wide area and over a long period, are practices that can promote to touch off a plague.

The action plan promoted by the IRRI recommends two basic strategies. First, enhance biodiversity. And second, regulate the marketing and use of insecticides, including the prohibition of certain insecticides in rice pest just promoting rather than preventing them (to also kill natural predators of insects that are designed to prevent).

With support from IRRI, Thailand banned several months ago the use of two insecticides in rice: abamectin and cypermethrin, which are the main indirect causes of insect pests Fulgoroidea, according to the findings of several investigations. Also, in March 2010, the Vietnamese province of An Giang began to adopt ecological engineering practices, such as growing flowers near the rice fields to feed some of the major predators of Fulgoroidea.

Many stars in our galaxy are circulating within the galactic disk. The stars of this disc orbit around the center of the galaxy. Most orbits are aligned in a plane, as are the planets around the sun in our solar system. However, some stars orbit following paths that lead to well above and below the plane of our galaxy, the Milky Way.

The team of the astronomers Judy Cheng and Connie Rockosi from the University of California at Santa Cruz was proposed to find out what kind of stars are these, where form, and how have arrived at their current locations. The orbits of these stars make them markedly different from the main stars of the Milky Way, but new research shows that chemical composition also makes them unique.

The first generation of stars, which was forged from the material directly created by the Big Bang, was composed entirely of hydrogen and helium. Over time, these first stars became something of their hydrogen and helium into heavier elements like calcium or iron, and when they died, their heavy elements became part of the next generation of stars.

As new stars were born and grew the disk of the Milky Way, each generation of stars had more calcium, iron and other heavy elements. Therefore, you can determine which parts of our galaxy have seen several generations of stars, simply by examining the abundance of heavy elements in stars of each part of the galaxy.

Cheng and Rockosi team evaluated the content of heavy elements in thousands of stars in the disk. Near the plane of the galactic disk, home of the common stars of the disk, the stars near the center of the galaxy had a higher content of heavy elements than further away. This implies that the outer disk of our galaxy is made up of fewer generations of stars inside the disk, which means that the Milky Way grew from the inside out.

However, the analysis of the stars that are clearly part of the disk of the Milky Way but are well above or below the plane of the disc, has revealed that the amount of heavy elements in these stars do not follow the same trend. Anywhere outside the galactic plane where the team watched Cheng, the stars had a low content of heavy elements.

It is not known whether these intriguing stars were born with those unusual orbits, or if they were displaced by something that happened in the past. What does seem clear is that this is very old stars.

Cook had special relevance in the steps you have followed the evolution of man. Therefore, according to Rachel Carmody, a researcher at Harvard University and director of a study published in the journal Proceedings of the National Academy of Sciences (PNAS), “it is surprising that we do not understand the fundamental properties of the food we eat”.

Carmody’s study offers theoretical advances in human evolution and a practical vision for modern nutrition. “The biochemical methods to determine the caloric value that appears on food labels do not take into account the effects of energy transformation”, Carmody explains.

The authors fed two groups of mice for 40 days with a diet based on meat and potatoes prepared in four ways: all raw foods and intact, raw and crushed, simply cooked and cooked and mashed. During dieting, controlled changes in body mass of each mouse and observed how the exercise wheel used its cage. The results clearly showed that the cooked meat brought more energy to mice that raw meat.

“Energy is the main reason we eat”, says Carmody. “We hope our work will stimulate further research to improve the management of caloric intake”.

Humans ate raw meat and 2.5 million years ago, when they still did not control the fire. Probably they struck it with tools before eating it. Later, 1.9 million years ago, the body of the first humans grew; their brain became more complex and acquired skills to run long distances, so the energy from their diet became more important.

“Our work reinforces the idea that the adoption of the kitchen was an important event in human evolution”, says Carmody. “Cooking would have provided the necessary energy to the first humans to overcome these evolutionary changes as expensive energy”.

For Richard Wrangham, Professor of Biological Anthropology at Harvard University, the importance of the theory of Carmody, defended by him before, is that “first we know why the kitchen is so important culturally and biologically: because it gives us more energy, and life energy is very important”.

Medical Alert Devices For Seniors are of various types such as bracelets, pendants, lockets, watches, pins and other items. It is advisable to purchase or donation of a medical alert system before disaster strikes. Many people mistakenly expect to occur in an emergency, before buying a medical alert device. Others are not able to learn, even after an experience and go through the whole crisis again.

It is recommended for patients with serious diseases like Alzheimer’s, heart disease, asthma, diabetes, blindness, hearing problems, and other diseases, the medical alert for the person or practice. Vital statistics on medical conditions, medication and food allergies, and medications approved and contacts in case of accident may be embossed on the surface of a paper of medical ID.

There are several factors a buyer should make sure, before buying one of several available medical alert systems. It is advisable to check the system’s efficiency and profitability. It should also ensure that the monitoring station, provided by the companies are good and are able to offer the listed services.

Medallions as medical alerts are a good choice for patients, young and old as they have several advantages. A person can easily wear these while still hiding the medallion in the clothing. This helps them be free to be conscious of their image. The medallions are also handy in an emergency while the doctor can easily access and work on the medical input available on these devices. The shape and size of the medallions are also suitable for stamping medical information on them.

The fossil remains of Homo neanderthalensis found at the site of the Sidron (Asturias) are helping to understand more deeply the population of this species that settled on the Cantabrian coast about 50,000 years ago.

The team led by Antonio Rosas from the National Museum of Natural Sciences, CSIC, and which brought together researchers from the University of Madrid and University of Oviedo, examined the skulls of three copies of this site.

From these studies it has learned that the brain of Neanderthals was asymmetric, “more than the actual human being” says Rosas, who adds: “the partitioning of the brain in Neandertals has its own characteristics”.

The dural venous drainage patterns of the Neanderthals seem more asymmetrical than in other species of hominids. The dural venous sinuses are spaces that drain blood from the brain and run between the inner and outer layers of the dura, which is the meninges attached to the bones of the skull. These sinuses serve as channels of low pressure to evacuate blood from the brain to the systemic circulation. Dural venous drainage is related to the relative proportions and the three dimensional configuration of the brain.

More specifically, the uniqueness of the drainage system in Neanderthals characterized by variability in how they bind these sinuses: a pattern is not seen drain confluence although there is a greater percentage of right dominance, and in some cases, enhanced deviation from the midline sagittal sinus.

The bones of the skull have a role in protecting the brain, so that exactly fit the size and shape of this important body. The final structure of the skull will depend largely on the morphological features of central nervous system. When the inside of the skull is consolidated, it is in contact with the outer surface of the brain, i.e. the meninges or membranes surrounding the brain. The meninges are adapted to the relief of the bodies that line, so that they are marked on the outer convolutions and sulci of the brain, and blood vessels: arteries, veins and venous sinuses. It is marked on the inner surface of the cranial bones, as a mold or dies.

The study of paleontology in Neanderthals is a very important source of knowledge to understand human brain evolution. The reason for this interest lies in several aspects such as its unique brain morphology, the fact of having one of the biggest brains in hominids and the fact that they are our closest relatives; do not forget that we share a common ancestor.

This concept applies not only to electromagnetic waves but can also be transferred to other types of waves, such as sound.

It has now been successfully demonstrated for the first time an invisibility cloak for elastic waves. These waves appear, among many other sites on the strings of a guitar and the drum heads.

In their pioneering experiment, the team of Nicolas Stenger, Institute of Applied Physics, and Martin Wegener and Martin Wilhelm, Karlsruhe Institute of Technology in Germany both institutions, has used a material with a specially designed microstructure, consisting of two polymers, specifically a soft and a hard plastic, a thin plate.

The vibrations of this plate are in the range of audible frequencies, in this case about 100 Hz, and can be seen directly from above. Scientists have found that the sound waves in a circular area bordering the thin plate so that the vibrations can neither enter or leave the area. Unlike other media known for protection against noise, sound waves not are absorbed or reflected. It is as if there was no anything, in the words of Wegener.