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Women were unaware of their risk for osteoporosis , that women do not know how to increase calcium intake in their diets , and that young women do not consider osteoporosis to be a problem . It is also used to synthesize calcium carbide and in the manufacture of graphite and electrodes . A questionnaire was advertised in two campus newspapers ( @ Guelph and The Ontarion ) and was sent electronically to all students registered for the Winter 2003 semester with the CSD as well as to all presidents of employee associations / unions . Dr. Sterrett , ESAREC vegetable horticulturist , recommends maintaining adequate soil lime in order to increase calcium levels for future plantings in fields which have this problem . Occupational exposure may occur during the production of coke and tar from coal or while using coke to extract metals from their ores , to synthesize calcium carbide , or to manufacture graphite and electrodes ( NTP , 1991 ) . Observe that argument on these lines need not appeal to any need for an ozone layer to defend us against ultraviolet rays ; or for ice to float so as to form a protective cover over ponds ; or for there to be calcium , chlorine , magnesium , potassium , phosphorus , sodium and sulfur ( mineral elements essential to the actual organisms on our planet ) . I mean the president 's asked him to but it 's he who technically has declared the state of emergency so I do n't know that there 's anything more we can say to General Wiranto then we've said to him in the past and we've said to both President Habibie and Ali Alatas .