{"title":"Queueing arrival and release mechanism for K<sup>+</sup> permeation through a potassium channel.","authors":"Takashi Sumikama, Shigetoshi Oiki","doi":"10.1007/s12576-019-00706-4","DOIUrl":"10.1007/s12576-019-00706-4","url":null,"abstract":"<p><p>The mechanism underlying ion permeation through potassium channels still remains controversial. K<sup>+</sup> ions permeate across a narrow selectivity filter (SF) in a single file. Conventional scenarios assume that K<sup>+</sup> ions are tightly bound in the SF, and, thus, they are displaced from their energy well by ion-ion repulsion with an incoming ion. This tight coupling between entering and exiting ions has been called the \"knock-on\" mechanism. However, this paradigm is contradicted by experimental data measuring the water-ion flux coupling ratio, demonstrating fewer ion occupancies. Here, the results of molecular dynamics simulations of permeation through the KcsA potassium channel revealed an alternative mechanism. In the aligned ions in the SF (an ion queue), the outermost K<sup>+</sup> was readily and spontaneously released toward the extracellular space, and the affinity of the relevant ion was ~ 50 mM. Based on this low-affinity regime, a simple queueing mechanism described by loose coupling of entering and exiting ions is proposed.</p>","PeriodicalId":42871,"journal":{"name":"Quantum Studies-Mathematics and Foundations","volume":"10 1","pages":"919-930"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s12576-019-00706-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85309996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shashank Gupta, D. Das, C. Jebarathinam, Arup Roy, Shounak Datta, A. S. Majumdar
{"title":"“All-versus-nothing” proof of genuine tripartite steering and entanglement certification in the two-sided device-independent scenario","authors":"Shashank Gupta, D. Das, C. Jebarathinam, Arup Roy, Shounak Datta, A. S. Majumdar","doi":"10.1007/s40509-021-00261-x","DOIUrl":"https://doi.org/10.1007/s40509-021-00261-x","url":null,"abstract":"","PeriodicalId":42871,"journal":{"name":"Quantum Studies-Mathematics and Foundations","volume":"9 1","pages":"175 - 198"},"PeriodicalIF":0.8,"publicationDate":"2019-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43704475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Individuality, quasi-sets and the double-slit experiment","authors":"A. Sant’Anna","doi":"10.1007/s40509-019-00209-2","DOIUrl":"https://doi.org/10.1007/s40509-019-00209-2","url":null,"abstract":"","PeriodicalId":42871,"journal":{"name":"Quantum Studies-Mathematics and Foundations","volume":"7 1","pages":"179 - 193"},"PeriodicalIF":0.8,"publicationDate":"2019-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s40509-019-00209-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"52816460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Aharonov–Berry superoscillations in the radial harmonic oscillator potential","authors":"D. Alpay, F. Colombo, I. Sabadini, D. Struppa","doi":"10.1007/s40509-019-00206-5","DOIUrl":"https://doi.org/10.1007/s40509-019-00206-5","url":null,"abstract":"","PeriodicalId":42871,"journal":{"name":"Quantum Studies-Mathematics and Foundations","volume":"7 1","pages":"269 - 283"},"PeriodicalIF":0.8,"publicationDate":"2019-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s40509-019-00206-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48480485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Spencer Rogers, Y. Aharonov, C. Elouard, A. Jordan
{"title":"Diffraction-based interaction-free measurements","authors":"Spencer Rogers, Y. Aharonov, C. Elouard, A. Jordan","doi":"10.1007/s40509-019-00205-6","DOIUrl":"https://doi.org/10.1007/s40509-019-00205-6","url":null,"abstract":"","PeriodicalId":42871,"journal":{"name":"Quantum Studies-Mathematics and Foundations","volume":"1 1","pages":"145 - 153"},"PeriodicalIF":0.8,"publicationDate":"2019-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s40509-019-00205-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"52816442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Operator-based approach to $${mathcal {P}}{mathcal {T}}$$PT-symmetric problems on a wedge-shaped contour","authors":"F. Leben, C. Trunk","doi":"10.1007/S40509-019-00197-3","DOIUrl":"https://doi.org/10.1007/S40509-019-00197-3","url":null,"abstract":"","PeriodicalId":42871,"journal":{"name":"Quantum Studies-Mathematics and Foundations","volume":"1 1","pages":"1-19"},"PeriodicalIF":0.8,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/S40509-019-00197-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45281979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Chantasri, Shengshi Pang, Teerawat Chalermpusitarak, A. Jordan
{"title":"Quantum state tomography with time-continuous measurements: reconstruction with resource limitations","authors":"A. Chantasri, Shengshi Pang, Teerawat Chalermpusitarak, A. Jordan","doi":"10.1007/s40509-019-00198-2","DOIUrl":"https://doi.org/10.1007/s40509-019-00198-2","url":null,"abstract":"","PeriodicalId":42871,"journal":{"name":"Quantum Studies-Mathematics and Foundations","volume":"7 1","pages":"23 - 47"},"PeriodicalIF":0.8,"publicationDate":"2019-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s40509-019-00198-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"52816876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Langevin equation for a dissipative macroscopic quantum system: Bohmian theory versus quantum mechanics","authors":"H. Naeij, A. Shafiee","doi":"10.1007/s40509-019-00195-5","DOIUrl":"https://doi.org/10.1007/s40509-019-00195-5","url":null,"abstract":"","PeriodicalId":42871,"journal":{"name":"Quantum Studies-Mathematics and Foundations","volume":"7 1","pages":"5 - 15"},"PeriodicalIF":0.8,"publicationDate":"2019-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s40509-019-00195-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48381763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}