potassium translocating Kdp-ATPase, E coli

Known as: K+-translocating Kdp-ATPase protein, E coli, Kdp-ATPase protein, E coli, potassium Kdp ATPase protein, E coli 
 
National Institutes of Health

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1969-2016
0119692016

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2016
2016
  • Ðîññèÿ
  • 2016
Ïîä ïîïàðíîé êëþ÷åâîé ñõåìîé ïðåäâàðèòåëüíîãî ðàñïðåäåëåíèÿ êëþ÷åé ïðèíÿòî ïîíèìàòü ñõåìó, â êîòîðîé îäèí êëþ÷ àññîöèèðîâàí ðîâíî ñ äâóìÿ óçëàìè.  ïðèìèòèâíîé ñõåìå êàæäûé óçåë õðàíèò (n− 1) êëþ÷ äëÿ êàæäîãî óçëà ñåòè. Ýòà ñõåìà óñòîé÷èâà ê àòàêàì çëîóìûøëåííèêà, íî îáëàäàåò ïëîõîé ìàñøòàáèðóåìîñòüþ è òðåáóåò áîëüøèõ ðåñóðñîâ ïàìÿòè äëÿ õðàíåíèÿ êëþ÷åâûõ ìàòåðèàëîâ. Âñå ñõåìû ïðåäâàðèòåëüíîãî ðàñïðåäåëåíèÿ êëþ÷åé ïîäðàçóìåâàþò âîçìîæíîñòü ñâÿçè êàæäîãî àáîíåíòà ñåòè ñ êàæäûì. Òîãäà êàê â ðåàëüíûõ ñèñòåìàõ ñóùåñòâóþò ïîëèòèêè áåçîïàñíîñòè, îãðàíè÷èâàþùèå âîçìîæíîñòè âçàèìîäåéñòâèÿ îòäåëüíûõ ïàð ïîëüçîâàòåëåé. Áàçîâîé ïîëèòèêîé áåçîïàñíîñòè ÿâëÿåòñÿ äèñêðåöèîííîå ðàçäåëåíèå äîñòóïà, çàäàííîå â âèäå ìàòðèöû äîñòóïîâ, îïðåäåëÿþùèõ ðàçðåøåííûå êàíàëû ïåðåäà÷è èíôîðìàöèè. Îäíîé èç ñàìûõ íàäåæíûõ ñõåì, õîðîøî ðàçðàáîòàííîé è ñòàâøåé óæå êëàññè÷åñêîé, ÿâëÿåòñÿ KDPñõåìà [1, 2], îñíîâàííàÿ íà ïîñòðîåíèè ñåìåéñòâà ïåðåñåêàþùèõñÿ ìíîæåñòâ. Ñõåìà ïðåäâàðèòåëüíîãî ðàñïðåäåëåíèÿ êëþ÷åé íà îñíîâå ìíîãîìåðíûõ ïðîñòðàíñòâ (DDHV-ñõåìà) ïðåäëîæåíà â ðàáîòå [3].  äàííîé ñõåìå âìåñòî îäíîãî ãëîáàëüíîãî êëþ÷åâîãî ïðîñòðàíñòâà èñïîëüçóåòñÿ íàáîð êëþ÷åâûõ ïðîñòðàíñòâ. Êàæäîìó óçëó ñîïîñòàâëÿåòñÿ ïîäìíîæåñòâî êëþ÷åâûõ ïðîñòðàíñòâ. Äëÿ êàæäîãî îòäåëüíîãî êëþ÷åâîãî ïðîñòðàíñòâà èñïîëüçóåòñÿ ñõåìà Áëîìà. Âåðîÿòíîñòü òîãî, ÷òî äâà óçëà ñìîãóò âûðàáîòàòü ñîâìåñòíûé êëþ÷ ðàâíà âåðîÿòíîñòè òîãî, ÷òî îíè èìåþò õîòÿ áû îäíî îáùåå êëþ÷åâîå ïðîñòðàíñòâî. DDHV-ñõåìà àáñîëþòíî óñòîé÷èâà, åñëè êîëè÷åñòâî ñêîìïðîìåòèðîâàííûõ óçëîâ íèæå íåêîòîðîãî ïîðîãîâîãî çíà÷åíèÿ. Ñõåìà îáìåíà êëþ÷àìè, îñíîâàííàÿ íà ìîäåëè çëîóìûøëåííèêà ïðåäñòàâëåíà â ðàáîòå [4]. Äàííàÿ ñõåìà îñíîâûâàåòñÿ íà ïðåäïîëîæåíèè î òîì, ÷òî çëîóìûøëåííèê íå ìîæåò êîíòðîëèðîâàòü âñå ëèíèè ñâÿçè. Ââîäèòñÿ âåðîÿòíîñòü ïðîñëóøèâàíèÿ ëèíèè ñâÿçè çëîóìûøëåííèêîì. Ïîñëå ÷åãî èññëåäóåòñÿ âîçìîæíîñòü íåçàùèùåííîãî îáìåíà êëþ÷àìè ìåæäó ñîñåäíèìè óçëàìè. Çëîóìûøëåííèê ñìîæåò àòàêîâàòü ñèñòåìó, òîëüêî åñëè áóäåò ïðîñëóøèâàòü êàíàë ñâÿçè â ìîìåíò ïåðåäà÷è êëþ÷åâîé èíôîðìàöèè.  ñâÿçè ñ ðàçâèòèåì áåñïðîâîäíûõ ñèñòåì ñâÿçè øèðîêîå ðàñïðîñòðàíåíèå ïîëó÷èëè âåðîÿòíîñòíûå ñõåìû ïðåäâàðèòåëüíîãî ðàñïðåäåëåíèÿ êëþ÷åé, îáçîð êîòîðûõ ïðåäñòàâëåí â ðàáîòå [5].  ñòàòüå [6] ïðåäñòàâëåíû äâå ñõåìû, êîòîðûå îñíîâàíû íà íåêîòîðîé èíôîðìàöèè î ïðîöåäóðå ðàçâåðòûâàíèÿ ñåòè.  ïåðâîé ñõåìå ïîïàðíûé êëþ÷ ãåíåðèðóåòñÿ òîëüêî äëÿ òåõ ïàð óçëîâ, äëÿ êîòîðûõ âûñîêà âåðîÿòíîñòü îêàçàòüñÿ ôèçè÷åñêèìè ñîñåäÿìè ïðè ðàçâîðà÷èâàíèè ñåòè. Âòîðîé ïîäõîä îñíîâàí 
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2008
2008
The membrane-embedded K (+)-translocating KdpFABC complex from Escherichia coli belongs to the superfamily of P-type ATPases… (More)
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2001
2001
  • Z R YangllO
  • 2001
The Slater model for the K(HI -rDr)2P04 crystal is considered, and solved in two dimensions, by assuming an annealed proton… (More)
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1969
1969
The effect on the state of polarization of light incident nonnormally onto KDP in the biaxial state is described. The retardation… (More)
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