Control of Postharvest Anthracnose Using Chitosan and Lemongrass Oil Abstract Anthracnose is a postharvest disease of mango caused by the fungus Colletotrichum gleoesporiodes that results in major economic challenges during transportation and storage. It limits mango production in our country especially where high humidity prevails during the cropping season. Symptoms of this postharvest disease are black spots‚ starting from the stem‚ then proceeding to infect the mango fruit itself. For the control
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different studies around the world such as medicine‚ industry and research. * They consist of a radioactive isotope of any element Technetium-99m: * Half life: * The half life of Technetium-99m is 6 hours * Below is a diagram of the decay of Technetium-99m: * What type of radiation is emitted? * Gamma 140 keV is emitted from Technetium-99m in the process of decaying. * Describe the process in which the isotope is used: * Technetium-99m is used in medicine. It is
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DENR ADMINISTRATIVE ORDER NO. 26-A Series 1994 Subject: PHILIPPINE STANDARDS FOR DRINKING WATER 1993 UNDER THE PROVISION OF CHAPTER II‚ SECTION 9 OF PD 856‚ OTHERWISE KNOWN AS THE CODE ON SANITATION OF THE PHILIPPINES. To implement the provisions of section 9‚ otherwise known as the Prescribed Standards and Procedures of Chapter ll of the Code on Sanitation of the Philippines‚ PD 856‚ this Philippine National Standards for Drinking Water 1993 hereby revises and updates the 1978 National
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Week 2 Complete Lab 1. Solve the exponential equation by expressing each side as a power of the same base and then equating exponents. 6 x = 216 x = 3 2. Solve the exponential equation. Express the solution in terms of natural logarithms. Then use a calculator to obtain a decimal approximation for the solution. ex = 22.8 x= ~3.12676 3. Solve the following logarithmic equation. Be sure to reject any value of x that is not in the domain of the original logarithmic expression. Give
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Explanations for forgetting. One possible explanation for forgetting is retrieval failure sometimes known as decay theory. According to this theory‚ a memory trace is created every time a new theory is formed. Decay theory suggests that over time‚ these memory traces begin to fade and disappear. If information is not retrieved and rehearsed‚ it will eventually be lost. One problem with this theory‚ however‚ is that research has demonstrated that even memories which have not been rehearsed or
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Carbon-14 Dating: an Invaluable Yardstick in the Chronology of Humans Archeologists use many methods to analyze data from the past. One scientific tool they use is to analyze the radioactive decay of chemical elements found in plant and animal remains‚ pottery‚ and even in rocks. Radiocarbon dating‚ also known as carbon-14 dating‚ has been one of the most important radioisotope dating methods used. This scientific tool‚ which was first developed by Willard F. Libby in the late 1940s‚ has significantly
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was based upon carefully designed and conducted experiments that compared the ratios in rock samples of parent elements to daughter elements ( some of which would have been from radioactive decay of the parent‚ some of which may have been present in the sample at the time of formation). Since radioactive decay is known to occur at a constant rate‚ the age of a rock can be determined from the ratio of the parent element to the daughter element. The concerns about these dating methods were exactly the
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Nuclear chemistry in medicine is very controversial. Many say the dangers of using radioactive materials on human bodies are far more negative than positive. Others strongly agree with the use of radiochemistry in the field of medicine. Nuclear medicine is in the field of medicine by using imaging devices. Doctors use small amounts of radioactive materials called radio tracers that are either injected into the bloodstream‚ inhaled or swallowed. Radiation therapy is also a therapy that uses radioactive
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engram (the memory trace in the brain) gradually decays or loses its clarity. While such a theory seems reasonable‚ it would‚ if left at this point‚ do little more than restate behavioral evidence of forgetting at the nervous-system level. Decay or deterioration does not seem attributable merely to the passage of time; some underlying physical process needs to be demonstrated. Until a neurochemical basis for memory can be more explicitly described‚ any decay theory of forgetting must await detailed development
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radioisotopes are created‚ energy is released‚ allowing people to use it through various ways. Natural radioactive decay is a natural process‚ which an isotope spontaneously decays into another element through alpha‚ beta or gamma decay. In this process‚ four kinds of radioactive rays can be produced‚ alpha‚ beta‚ gamma‚ or neutron rays. Atoms that have a large nucleus tend to decay by alpha to reduce the size of their nucleus. When atoms have too many protons‚ extreme repulsion is caused and therefore
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