It is energy released by the splitting (fission) or merging together (fusion) of the nuclei of atoms. The conversion of nuclear mass to energy is consistent with the mass-energy equivalence formula E = m.c², in which E = energy release, m = mass defect, and c = the speed of light in a vacuum. Nuclear chemistry can be used as a form of alchemy to turn lead into gold or change any atom to any other atom (albeit through many steps). Radionuclide (radioisotope) production often involves irradiation of another isotope (or more precisely a nuclide), with alpha particles, beta particles, or gamma rays. Iron has the highest binding energy per nucleon of any atom. If an atom of lower average binding energy is changed into an atom of higher average binding energy, energy is given off. What is nuclear fusion? Nuclear fusion is the process by which multiple like- charged atomic nuclei join together to form a heavier nucleus. It is accompanied by the release or absorption of energy
tering operations within the EU. Moreover, and Hoover (2005) and the review article carcass-chilling involving application of cold by Aymerich et al. (2008). More specifically, air and reduction of surface water activity at these technologies include high hydrostatic the end of the dressing processes is a manda- pressure (HHP; 300 to 600 MPa, 2–10 min), tory practice worldwide (Bolton et al. 2002). irradiation with 1.5–5.5 kGy, pulsed electric Chemical decontamination treatments have fields, shock waves, high-intensity light, not yet received official approval in the carbon dioxide treatment (supercritical CO2), EU, even though Regulation 853/2004 ultrasonics, gas plasma (ionized gas) treat- (Commission of the European Communities ment, and oscillating magnetic fields (2–100 2004b) permits the use of substances other tesla; Tinney et al
(iv) yes (but no mark for yes on own) as calculated figure is smaller than 7.82; ecf applies to value calculated in part (iii) 1 [9] 25. (a) (i) due to mutation; A named mutation has changed, gene/allele/base sequence/DNA; random; irradiation/other named mutagen; genetically engineered; altered, mRNA/enzyme/protein; selective breeding; max 2 (ii) light intensity; carbon dioxide; water/humidity; temperature; mineral content of soil/potting compost; R nutrients pH;
to one another. (A) vast (B) ancient (C) dense (D) deep 12. The process of eutrophication involves a sharp increase in the concentration of phosphorus and nitrogen and promotes the growth of algae. (A) conceals (B) boosts (C) disrupts (D) halts 13. Evidence that harmful effects may result from small amounts of radiation has prompted concern about low level irradiation from various sources. (A) minimized (B) exaggerate (C) generated (D) sustained 14. Large sponges often harbor smaller organisms. (A) shelter (B) reject (C) avoid (D) consume 15. Most varieties of squash were cultivated by American Indian civilizations. (A) bartered (B) grown (C) eaten (D) gathered 16. The sugar maple grows to a height of 120 feet and has a dense crown of leaves that turns bright red in the fall. (A) vibrant (B) thick
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