LEDs are made of semiconductor layers arranged between metallic electrodes similar to an ordinary sandwich. When the power is directed on the electrodes, electrons charged negatively and holes charged positively are pressed in the center of the layers. This causes reactions that result in production of light.

This sounds simple but there is a setback. The semiconductors sheets in blue and green LED placed at the middle are made of gallium nitride. When the current in the LED bypasses it, it triggers the gallium nitride to produce own electrical fields. The electrical fields divide the negative and positive ions coming from the electrodes therefore stopping them from mixing. This also makes them to stop producing light. The increased incurrent results in the second field enlarging. This causes the electrons and holes to come together therefore lowering their effectiveness. The setback becomes so low causing the LEDs to be expensive than traditional better and low cost produced fluorescent and bulbs.

Yuji Zhao, an expert scientist in material and his team at Santa Barbara, University of California however developed an idea to reduce the sucking ability on the electrical field. The gallium nitride used in LEDs is produced on the sapphire or silicon carbide substrates. Though this is the easiest way that most manufacturers use to grow, it allows gallium nitride pellets to shape a glacial direction which in turn increases the sucking ability of the electrical field.

Yujis team got exclusive substrates from the Mitsubishi Corporation that deals with chemicals manufactured of gallium nitride. The component in the substrate allows the gallium nitride diodes to increase in a structured crystallization mode. These closely resemble the gallium nitride but sets it far than the normal polar technology used. The team produced the technology which allowed the LEDs to do away with electrical fields. Other manufacturers however produced diodes with both polar and non polar modes. As compared to Yujis product, theirs is less efficient as it does not reduce the droop. Yujis group manufactured the LED with 52% efficiency at 20Ma. This means that in case the power is increased even by a tenth, the working ability will reduce by a bout 14%. Any normal produced LED is capable of loosing 60% of its working ability when the extra power input is increased. The facts produced by the scientist led by Yuji will be availed on the coming conference on Laser and Electro- Optics on 10th of May at San Jose.

According to Emmanouil Kioupakis, a materials expert at the University of Michigan, Ann Arbor, the findings are much promising and if successful will reduce the price of LEDs. Emmanouil further stated that the findings by Yuji’s team based on gallium nitride will increasingly reduce electrons holes interface used to produce heat instead of light. This will also result in reducing electric field which is unnecessary.

Currently, Yuji’s specimen cost more than others and cannot be found easily. Though limited, it has a huge market. Better LEDs technology which can light a room will work better for people in developed and undeveloped countries who needs good working ability but who have low power inputs.

In a related case of lab-grown organ research, a separate group of rats at the Massachusetts General Hospital received artificially created livers which allowed them to live for nearly ten hours, up until the transplanted organs were removed. This serves as yet another example of the progress being made in the area of organ growth, an area that is set to one day revolutionize the calibre of medical care provided to human patients and eliminate the need for lengthy transplant waiting lists.

The procedure carried out that allows researchers to create organs in the lab starts with the removal of cells from a donated organ, using a special form of medical detergent. What remains is the protein scaffold of the original organ which provides scientists with the basic structure needed to create a new organ with different cells. The cells in question, usually cells pertaining to the relevant organ or adult stem cells, are extracted from the recipient of the new organ and are then applied to the protein structure and are left to grow around it to form a brand new organ.

The beauty of this technique is that, as mentioned above, the respective new organs are created using cells harvested from the person or animal in need of a transplant. As opposed to the traditional transplantation method, requiring the ongoing use of immunosuppressant drugs to prevent the body from rejecting a new organ, the acquired cells are perfectly matched to the organism’s body, thus eliminating the need for said drugs to be taken.

While successful organ creation and transplantation such as the cases highlighted in this report obviously act as an encouraging step in the right direction, there is a long way to go before the technique can be effectively incorporated into medical care for humans. In addition to the ongoing research required to improve the method’s effectiveness and reliability, clearly some organs are much more complex and difficult to re-create in the lab than others, as was highlighted by Laura Niklason, the bioengineer at the helm of the lab-grown lung procedure.

Niklason stated that “each organ has it’s own specific set of challenges” and it is this fact that makes growing complete organs in the lab such a time-consuming process that will not be perfected for quite some time. For instance, a lab-grown bronchus was successfully created and given to a female patient by European scientists two years ago, however, a bronchus is a far less intricately designed component of the body than an entire lung or heart and it is this sort of complexity that will prove most challenging to recreate.

However, while the routine use of lab-grown organs in human medicine remains a pipe dream for the time being at least, it should be noted that the use of organ scaffolds and recipient cells to produce an effectively new organ was first implemented in 2008 in order to create a rat’s heart with the ability to pump blood with the aid of a machine. While there is obviously a world of difference between the heart of a rodent and the heart of a human, it cannot be denied that steady progress is being made and that in time, once a sufficient understanding of the procedure and different organ structures has been gained, the knock-on effects for human patients will be phenomenal to say the least.

In addition they are good in wound healing and cancer treatments. Researchers have not concluded how this works, but they know it is through reactions of oxygen found in air. The molecules that are reactive, and also found in our immunity, work by oxidizing cell membranes, therefore destroying DNA systems. Equipments using the plasma technology are few and in testing phase to ascertain if they can work well. The machine must produce own power internally needed to release electrical discharges. An externally generated gas might also be required to power and maintain them. With all the above consideration, it becomes difficult for them to be used in time of emergencies, disasters responses and in military.

Researchers working in Chinas Huazhong University of science and technology led by Engineer Xinpei Lu believe the existence of an internal tool to avoid such setbacks. The plasma flashlight model, connected with a 12 volt power source working in an open environment with no gas supply, can be moved to any station. According to researcher Kostya Ostrikov of the CSIRO materials science and engineering in Lindfield, Australia, the machine produces plasma even without the connection to the wall and uses lower power inputs.

Moreover the battery connected to the flashlight is tiny and cannot produce the needed plasma alone. To counter this engineers have to use a DC booster machine to increase the voltage to 10 kilovolts. A single output from the booster is connected to the shell in the device (grounded). The other outputs are connected to 12 arrays of excellent, stainless steel needles that produce pulse electrical discharge. To control the currents electrical charges produced, the machine has many ballast resistors. This makes it cool to avoid burning people who come into contact with it.

In order to test the machine, an Entrerococus faecalis bacteria which affects the canal roots in the mouth and resistant to antibiotics and heat was used by engineer Lu and the group. The group used biofilm extractions as testing elements to take charge as control prototypes. The other biofilms were exposed to the plasma flashlight for five minutes, each within a distance 5mm. Each test was marked with two solutions of fluorescent. A green solution represented living cells, and red for dead cells.

The results were as follows. The control tests remained green while treated sample had turned reddish, almost to the bottom of biofilms. This was about 17 cells deeper. These results were published and can be accessed online today in the physics D: journal. Applied physics was better as compared to stationary plasma machine which had been tested in the first face by Lu’s team.

According to Michael Keidar working as a physicist at the George Washington University, the portability of the device was more advantageous as using the cold plasma proved a hard task. It became one of the best solutions in terms of moving specifications. Another benefit shown by researcher Miran Mozeit&#269 working with Joseph Stefan Institute in Ljubljana Slovenia is that the plasma flashlight made use of 60 milliwats in a single discharge making the battery to last longer.

According to Ostrikov, just like other medical machines, the plasma flashlight must be improved significantly to be perfect, like in size and improving efficiency. Ideally it has become a profit making machine.

The whole idea of optical illusion emerges from various optical properties which include gravity\’s nature of warping and refractive index. The refractive index is whereby light seems to take a significant turn through water resulting to tilting effects when an object is immersed in water. For instance, if you were to place a pen in water or a straight rod you will notice that pen or rod appears curved while under water. For gravity\’s warping nature anyone who observes the movement of stars will notice that they seem to travel in a curved direction or any of other heavenly objects such as meteors or asteroids. Therefore, all these observations can be attributed to optical illusion where the curve aspect on light travel is influenced externally either though water or gravity.

Therefore, one may beg to ask on how physicists came up with the idea that light bends and this aspect can be traced to the late 1970s where the Michael Berry from Bristol University in UK and Nandor Balazs from New York University made certain discoveries. These physicists did come up with Airy waveform where when quantum particles move they seem to bend a little bit. Until 2007 the theory by Nandor and Berry had been ignored so Demetri Christodoulides together with some other physicists from Central Florida University through manipulation of the Laser light where Airy waves of optical versions were generated the beam curved slightly when crossing the detector.

Now the biggest milestone was to see if light bends through whichever angle including a full circle and so far physicists such as Mordechai Segev and his colleagues from Israel Technology institute have come up with a way on how to make this possible. Their discoveries have been anchored on Maxwell\’s equations which have formulas describing dissemination of electromagnetic waves like light. Therefore, Segev argument is that for light to curve through big angles it would require proper shapes thus contesting the earlier arguments that no proper shape was necessary to make light bend.

Therefore, best outcome of this discovery is that a group in France spearheaded by John Dudley from Unversity of Francge-comté had also been conducting experiments on \”light bends.\” Through modification of the Airy Function they used equipment known as spatial light modulator where the final outcome was light that self-bent up to 60¢ª. However, the discovery still leaves many physicists with a puzzle to solve considering Pavel Polynkin at University of Arizona insists that light does not really bend but only seem to do so or appear to do so.

Telomerase enzyme plays a key role for the maintenance of telomere in reproductive and stem cell activities in the human body. Research studies carried out by biotechnology giant firm, Geron Corporation in the year 2001, was able to reveal the possibility of isolating a molecule called TA-65 from astragalus plant. According to this team of researchers, the molecule was able to boost activity of telomerase enzyme within the body. This theory has however not been published among the evaluated peer-reviewed studies. The particulars of Geron invention was licensed for further expansion on development to T.A. sciences in the New York City as a nutrition supplement. This move was convenient due to the fact that nutritional supplements do not require FDA approval unlike medication products. By the year 2007, there were several physicians selling the TA-65 in the name of a nutrition supplement to clients. Reports of self evaluation from the users indicated positive responses that were supported by claims that it boosted visual and cognitive performance among athletes.

Further progress in projected to be put by T.A. on the publication of the research findings on peer-reviewed studies about TA-65 supplement this year. It is shown to have a significant relationship with bone density, anti aging properties and immune system of the body, a factor that is considered a major boost to this research invention. The results are supposed to assist those adopting its use for making a decision on the credibility of placing an annual price tag of $ 8000 on the supplement. A group called Sierra sciences of Reno in Nevada is also working on the maintenance of telomerase in their pharmaceutical laboratories and promises to unveil a drug on this kind within a period of 15 years. This is according to the CEO, Bill Andrews who says that they are stocking 35 different chemicals that turn on the telomerase gene.

Other than the consideration for this drug to be in market, Geron is currently pursuing a comprehensive research on telomerase as a possibility for cancer therapy. The study was supported by the concept of this enzyme’s absence in most body cells but being able to be detected in malignancies. When this enzyme is inhibited, cancer cells are said to be killed or their division subsides. The company is therefore working with telomerase inhibitor called imetelstat to selectively kill cells having tumor characteristics. Presently clinical trials are in the first phase of the study with the second phase involving testing. One of the challenges is that while this is aimed at finding an end to cancer, it might also be a cause for cancer. Supporting this claim is studies’ findings conducted in mice that indicate higher susceptibility to skin tumors and breast cancer with high levels of telomerase activity. So far this study is far from being compounded to be a medical breakthrough in dealing with cancer.

Recent researches and discoveries have suggested that there are slight variations in the math that is generally ordained as the time period of an Earth’s Rotation. This is somewhat increases the timing of the Earth’s spinning in the annual course and months. This is a geographical fact that the earth rotates on its axis but constant researches have also challenged this theory and prescribed leaning and swinging of the planet while rotating.Geophysicists are suggesting that this kind of variation in swaying and swinging in Earth’s rotation is possible as the thick and concrete iron inner core, liquid metal outer core and rocky mantle are all not rotating at a fixed time. According the earth scientist Bruce Buffet of University of California, with the friction, these layers of earth’s core can be drawn under a line but to make the whole thing work out, the core will have to apply magnetic pull on the mantle.

According to science, the mantle rock consisting iron monoxide is not able to conduct electricity in the temperature and pressure of the Earth’s surface. A 1980 research presumes that only with a shockwave that conduction of electricity would have been culminated through the free movement of the electrons within the atoms.This research somehow proves that layers of mantle are a good conductor of electricity; though the scientist says, “the origin of the metallic layer remains an open question.”

A curious Kenji Ohta from the University of Japan set forward to make sure whether the 1980 research of whether the iron monoxide of the Earth’s mantle is able to conduct electricity or not. On applying laser on a disk of the material and transforming it into a diamond anvil, the team of Ohta found that it is possible! The team enforced 700,000 times of the Earth’s atmosphere and provided a temperature of 1600 degree Centigrade and finally concluded that Earth’s mantle containing iron monoxide can conduct electricity beside the metals.

Geophysicist Ronald Cohen of the Carnegie Institution for Science in Washington, D.C., suggested that the iron monoxide has been metamorphosed from nonconductive to conductive without changing the structure either. Only at high temperatures and pressures the changes are possible in these magnetic materials, by letting the electrons move freely.
Buffet finally recommends that through the 9% of iron monoxide is not enough but yes with the help of scientific researches and efforts the answers of earth’s rotation will be clearer to the geophysicists.

The results of the studies were published last March 23 (Science) and March 22 (Nature-online version). But instead of removing memories as shown in the movie, scientists were able to create artificial memories into the mice’s brain. Indeed, this is interesting because the study profoundly reveals how the brain generates and utilizes memories.

Generally, scientists learn about brains functions (like memory) from similar studies that seek for signs of natural memories. Studies about things that intervene with memory or recall also provides information to researchers. However, in the new study, memories are created according to Richard Morris, a neuroscientist form the University of Edinburgh in Scotland. Dr.Morris believes that the new study is a breakthrough that would provide significant advancement towards understanding memories.

In the experiment, two teams worked together that utilized two dissimilar approaches. The objective of the methods applied was to produce a false memory of terrifying situation for a mice. According to the report in Science, a molecule that activates nerve cells was binded with a certain drug. A team of neuroscientists led by Mark Mayford of Scripps Research Institute and University of California used such molecules along with genetics engineering. Hence, only the nerve cells responsible for creation of a particular memory in the mice would remain active and start producing the molecule. By doing so, the molecule creates markings in the brain (similar to trails in a forest); thus, it generates a memory which can be reactivated by scientists at a later time.

To give a more graphical description, the marked memory is a square room with semi-transparent white walls and floor. No specific odors can also be found. The mice were allowed to play in such room; after which, their memories were tagged. Then, the mice were transferred to a room with wintergreen scent. This time, the room was characterized by a black-and-white checkered wall with a griddled floor. At this point, the animals were subjected to small shocks that created a fearful response. The mice were terrified and froze in response to the stimuli.

Numerous trials were conducted by the researchers. Some of the trials were used for reactivating the memory of the white room with shock session. As a result, the reactivated memory in the mice associated the fear of shock with the white room thereby producing a hybrid memory. In the following trials, the mice reacted in fear every time the researchers placed the animals in the second room. According to Mayford, the result shows the possibility of creating a synthetic memory. In the future, the results would hopefully present more insights into the mechanism of the complex human mind as it produces memories.

Scientists from different parts of the world are studying the possible consequences of this problem and creating awareness. Jiping Liu, a renowned climate scientist of Georgia Institute of Technology in Atlanta explained that if the sea ice continues to reduce dramatically, it will ultimately increase the amount of snow. He was also the co-author of the study published online in Proceedings of the National Academy of Science on February 27.

It is strange that despite rising temperatures, different places on earth endured abnormal snowfall and harsh winter. According to the records, few of the noticeable incidents are abnormal snowstorms in the east coast of United States during the winter of 2009-2010 and 2010-2011, exceptionally high level of snow recorded by Japan this winter and the canals of Danube and Venice in Europe projected a rare view when the water froze over.

During early investigation, scientists emphasized upon El Nino, which was thought to be the main reason of abnormal weather changes. But later the team of scientists Liu shifted and concentrated their study on the floating ice of the Arctic region. Scientists have detected that the Arctic area is warming up twice as quickly as the average rate of Northern Hemisphere.

The sea ice has reduced by 27.3 percent between 1979 and 2010. The observation in 2007 was astounding which showed a devastating decline in the sea ice coverage area. Researchers calculated that reduction of 1 million square kilometres of ice indicates the increase in snowfall by approximately 3 to 12 percent, especially in places like china, United States and Europe.

The link between sea-ice cover and snow cover has been re-confirmed by Ralf Jaiser, another climate scientist of Alfred Wegener Institute for Polar and Marine Research in Potsdam, Germany. Jaiser and other scientists have been trying to figure out how the far distant places feel the chilling effect because of the changes in sea ice. Researchers found that when the sea ice disappears, water becomes more exposed to the sun and absorbs more sun energy. As a result, both the surface of water and the air get the heat. This situation in turn creates a high pressure system and changes the way the wind circulates.

Different published reports like Geophysical Research Letters in 2009 and Journal of Geophysical Research in 2010 suggested that the high pressure push cold airs out of Arctic and sends in Europe which is responsible for extreme winter. According to scientist Liu, exposed and warm sea water releases more vapour which forms more ice.

Contrary to the belief of Liu, scientist Stephen Vavrus from Wisconsin-Madison University said that most parts of United States already have very low humidity during winter. He expressed doubt regarding the role of moisture from arctic for creating heavy snowfall. Scientists have admitted the possibility of other factors as well in controlling the severity of snowfall in winter.

Radley Horton, a scientist from Columbia University also expressed concern saying that if the Arctic sea ice continues to melt this way, the intensity of winter and snowy weather will definitely increase in near future.

The study conducted by climate scientists from ETH Zurich Joeri Rogelj along with his colleagues and published online in Nature Climate Change. They found 193 samples to calculate an estimate of how the climate responds to emissions of greenhouse entered the public into the atmosphere by the end of this century. It is a simulation of the model to keep global warming below two degrees Celsius by produce technological advances in fuel burn more efficiently, the development of renewable fuels, and the amount of fossil fuels available. Then the scientists put a wide range of emissions into climate models, on the scenarios to predict how we can avoid dangerous for global warming.

The scientists examined three of the 193 scenarios that have been made to keep the temperature of the atmosphere below the danger level. The results suggest that scientists should take challenging decisions in curbing greenhouse. Emission’s reductions will be made in 2020 reduced by 50% in 2050. That is a long time. However, it is a fairly good considering that to eliminate greenhouse gases requires the great energy systems.

Neil Edwards from the Open University, Milton Keynes, England, and Rogelj mention that the undertaken modeling produce uncertainties in the social and technological. Edwards said that some scenarios, indicate the type of future they want and cutting edge is needed as an innovative in every way to get success in overcoming global warming.

Peter deMenocol who is a marine geochemist and geologist at Columbia University notes that a number of theories have been floated to explain the climate change. Volcanic activities, cooling of North Atlantic Ocean, greenhouse gases concentration and the diminishing atmospheric pressure being some of the projected scientific opinions.

Scientists such as deMenocal have nonetheless shifted attention to the eastern and western forces guiding Indian and Pacific Oceans’ temperature gradients. The gradients are vital in the shaping of East Africa’s rainfall pattern making them significant owing to equatorial Pacific and western Indian Oceans’ warm waters.

The de Menocal led team of researchers has conducted analysis of sea temperature records obtained from the bottom of Pacific Ocean to establish if Tropical Oceans dried out East Africa. The team found that Indian Oceans’ temperatures were between 27° and 28°C while the Arabian Sea’s stood at 25°C as temperatures in Pacific shifted from 28° to 29°C. These changes coincidentally took place when rainfall patterns in East Africa were changing 2 million years ago.

Andrew Weaver who is a climate scientist at Canada’s Victoria University notes that deMenocal’s study raises important climate change questions. For example, how the disappearance of the oceanic temperature gradients will lead to increased rainfall in East Africa. This is because East Africa’s modern day rain formation is influenced by the western Pacific Ocean’s warm waters and this diverts the rains to places such as Australia and Bomeo. Though the creation of grassland as a result of oceanic temperatures has established an ecosystem in which herbivores, carnivores and omnivores flourish, revamping East Africa’s rainfall pattern remains a biting socio-scientific issues.