Going to university is expensive, and textbooks can make the bill go even higher. However, you don't have to break the bank to finance a good education; there are plenty of places on the Web where you can find and download free online books for nearly any class available. Here are ten sources on the Web you can use to find free content for many college classes, all freely available to either download and print offline or view online in your browser. 1.
Gary Samuels Crop loss due to disease-causing fungi can be reduced using environmentally friendly means known as biological control. Such control measures are urgently needed to decrease the use of chemical pesticides in farming. Although microfungi in the Hypocrea - Trichoderma group are effective for biological control of crop pathogens, their use in biological control is hindered by lack of knowledge about their classification and characterization. Trichoderma and its sexual state Hypocrea are a confused complex of species that are difficult to identify. Moreover, the probability of finding new Trichoderma species and biotypes for use as biological control agents is high in unusual habitats and unexplored geographic areas.
Speaking at the National Meeting of the American Chemical Society in California, MIT professor Daniel Nocera claims to have created an artificial leaf, made from stable and inexpensive materials, which mimics nature's photosynthesis process. The device is an advanced solar cell, no bigger than a typical playing card, which is left floating in a pool of water. Then, much like a natural leaf, it uses sunlight to split the water into its two core components, oxygen and hydrogen, which are stored in a fuel cell to be used when producing electricity . Nocera's leaf is stable -- operating continuously for at least 45 hours without a drop in activity in preliminary tests -- and made of widely available, inexpensive materials -- like silicon , electronics and chemical catalysts.