Wolbachia sp. wDs
National Institutes of Health
Papers overview
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Ââåäåíèå Áîëüøèíñòâî ïðèðîäíûõ ìèíåðàëîâ áëàãîðîäíûõ ìåòàëëîâ ââèäó èõ íåáîëüøèõ ðàçìåðîâ è ðåäêîãî ðàñïðîñòðàíåíèÿ äîâîëüíî ñëîæíî äèàãíîñòèðîâàòü. Íàèáîëåå ïîäõîäÿùèì è øèðîêî èñïîëüçóåìûì ñïîñîáîì èõ èäåíòèôèêàöèè ÿâëÿåòñÿ ìåòîä âûñîêîðàçðåøàþùåé ìèêðîñêîïèè, êîòîðûé ïîçâîëÿåò ïîëó÷àòü êà÷åñòâåííûå EDS-, WDS-õàðàêòåðèñòèêè ìèíåðàëîâ, íåñìîòðÿ íà èõ íåáîëüøèå ðàçìåðû. Ãëàâíûì ìèíóñîì òàêîãî ìåòîäà ÿâëÿåòñÿ òî, ÷òî åñëè ìèíåðàë èìååò ðàçìåðû ìåíüøå äèàìåòðà ïó÷êà çîíäà, òî ïîëó÷èòü êîððåêòíûé õèìè÷åñêèé ñîñòàâ äîâîëüíî ñëîæíî, ââèäó òîãî ÷òî çàõâàòûâàåòñÿ îêðóæàþùàÿ ìèíåðàë îáëàñòü. Íåñìîòðÿ íà òî, ÷òî â íàñòîÿùåå âðåìÿ ñóùåñòâóþò ñêàíèðóþùèå ýëåêòðîííûå ìèêðîñêîïû ñ âîçìîæíîñòüþ äèàãíîñòèêè íàíîðàçìåðíûõ ìèíåðàëüíûõ ôàç, äî ñèõ ïîð ãëàâíîé ïðîáëåìîé ïðè èçó÷åíèè õèìè÷åñêîãî ñîñòàâà ìèíåðàëîâ îñòàåòñÿ îïðåäåëåíèå èõ ñòðóêòóðíîé ðàçíîâèäíîñòè, à òàêæå íåîáõîäèìîñòü ïîäòâåðæäåíèÿ ïîëèìîðôíîé ìîäèôèêàöèè, íàïðèìåð ñ ïîìîùüþ ðåíòãåíîñòðóêòóðíîãî àíàëèçà (ÐÑÀ). Ïðè ýòîì äëÿ ìåòîäà ÐÑÀ íåîáõîäèì îáúåì àíàëèçèðóåìîãî ìàòåðèàëà, ðàâíûé 100 ìì3, ÷òî íå ïîäõîäèò â ñëó÷àÿõ, êîãäà îòáîð íóæíîãî êîëè÷åñòâà âåùåñòâà íåâîçìîæåí.  ñëó÷àå èñïîëüçîâàíèÿ ôîòîìåòîäà òðåáóåòñÿ íåçíà÷èòåëüíûé îáúåì ìàòåðèàëà (1 ìì3 è ìåíüÓÄÊ 553.08(234.82)
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