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Besga B, Faisant F, Petrosyan A, Ciliberto S, Majumdar SN. Dynamical phase transition in the first-passage probability of a Brownian motion. Phys Rev E 2021; 104:L012102. [PMID: 34412290 DOI: 10.1103/physreve.104.l012102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Accepted: 06/22/2021] [Indexed: 06/13/2023]
Abstract
We study the first-passage time distribution (FPTD) F(t_{f}|x_{0},L) for a freely diffusing particle starting at x_{0} in one dimension, to a target located at L, averaged over the initial position x_{0} drawn from a normalized distribution (1/σ)g(x_{0}/σ) of finite width σ. We show the averaged FPTD undergoes a sharp dynamical phase transition from a two-peak structure for b=L/σ>b_{c} to a single-peak structure for b<b_{c}. This transition is generated by the competition of two characteristic timescales σ^{2}/D and L^{2}/D, where D is the diffusion coefficient. A very good agreement is found between theoretical predictions and experimental results obtained with a Brownian bead whose diffusion is initialized by an optical trap which determines the initial distribution g(x_{0}/σ). We show that this transition is robust: It is present for all initial conditions with a finite σ, in all dimensions, and also exists for more general stochastic processes going beyond free diffusion.
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Affiliation(s)
- B Besga
- Université Lyon, ENS de Lyon, Université Claude Bernard, CNRS, Laboratoire de Physique, UMR 5672, F-69342 Lyon, France
| | - F Faisant
- Université Lyon, ENS de Lyon, Université Claude Bernard, CNRS, Laboratoire de Physique, UMR 5672, F-69342 Lyon, France
| | - A Petrosyan
- Université Lyon, ENS de Lyon, Université Claude Bernard, CNRS, Laboratoire de Physique, UMR 5672, F-69342 Lyon, France
| | - S Ciliberto
- Université Lyon, ENS de Lyon, Université Claude Bernard, CNRS, Laboratoire de Physique, UMR 5672, F-69342 Lyon, France
| | - Satya N Majumdar
- LPTMS, CNRS, Université Paris-Sud, Université Paris-Saclay, UMR 8626, F-91405 Orsay, France
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Merinero B, Alcaide P, Martín-Hernández E, Morais A, García-Silva MT, Quijada-Fraile P, Pedrón-Giner C, Dulin E, Yahyaoui R, Egea JM, Belanger-Quintana A, Blasco-Alonso J, Fernandez Ruano ML, Besga B, Ferrer-López I, Leal F, Ugarte M, Ruiz-Sala P, Pérez B, Pérez-Cerdá C. Four Years' Experience in the Diagnosis of Very Long-Chain Acyl-CoA Dehydrogenase Deficiency in Infants Detected in Three Spanish Newborn Screening Centers. JIMD Rep 2017; 39:63-74. [PMID: 28755359 DOI: 10.1007/8904_2017_40] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 06/08/2017] [Accepted: 06/15/2017] [Indexed: 12/13/2022] Open
Abstract
Identification of very long-chain acyl-CoA dehydrogenase deficiency is possible in the expanded newborn screening (NBS) due to the increase in tetradecenoylcarnitine (C14:1) and in the C14:1/C2, C14:1/C16, C14:1/C12:1 ratios detected in dried blood spots. Nevertheless, different confirmatory tests must be performed to confirm the final diagnosis. We have revised the NBS results and the results of the confirmatory tests (plasma acylcarnitine profiles, molecular findings, and lymphocytes VLCAD activity) for 36 cases detected in three Spanish NBS centers during 4 years, correlating these with the clinical outcome and treatment. Our aim was to distinguish unambiguously true cases from disease carriers in order to obtain useful diagnostic information for clinicians that can be applied in the follow-up of neonates identified by NBS.Increases in C14:1 and of the different ratios, the presence of two pathogenic mutations, and deficient enzyme activity in lymphocytes (<12% of the intra-assay control) identified 12 true-positive cases. These cases were given nutritional therapy and all of them are asymptomatic, except one. Seventeen individuals were considered disease carriers based on the mild increase in plasma C14:1, in conjunction with the presence of only one mutation and/or intermediate residual activity (18-57%). In addition, seven cases were classified as false positives, with normal biochemical parameters and no mutations in the exonic region of ACADVL. All these carriers and the false positive cases remained asymptomatic. The combined evaluation of the acylcarnitine profiles, genetic results, and residual enzyme activities have proven useful to definitively classify individuals with suspected VLCAD deficiency into true-positive cases and carriers, and to decide which cases need treatment.
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Affiliation(s)
- B Merinero
- Centro de Diagnóstico de Enfermedades Moleculares, Centro de Biología Molecular-SO UAM-CSIC, Universidad Autónoma de Madrid, Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), IdiPAZ, Madrid, Spain.
| | - P Alcaide
- Centro de Diagnóstico de Enfermedades Moleculares, Centro de Biología Molecular-SO UAM-CSIC, Universidad Autónoma de Madrid, Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), IdiPAZ, Madrid, Spain
| | - E Martín-Hernández
- Departamento de Pediatría, Unidad de Enfermedades Mitocondriales-Metabólicas Hereditarias, Hospital Universitario Doce de Octubre, Universidad Complutense de Madrid, CIBERER, Madrid, Spain
| | - A Morais
- Unidad de Nutrición Infantil y Enfermedades Metabólicas, Hospital Universitario Infantil La Paz, Madrid, Spain
| | - M T García-Silva
- Departamento de Pediatría, Unidad de Enfermedades Mitocondriales-Metabólicas Hereditarias, Hospital Universitario Doce de Octubre, Universidad Complutense de Madrid, CIBERER, Madrid, Spain
| | - P Quijada-Fraile
- Departamento de Pediatría, Unidad de Enfermedades Mitocondriales-Metabólicas Hereditarias, Hospital Universitario Doce de Octubre, Universidad Complutense de Madrid, CIBERER, Madrid, Spain
| | - C Pedrón-Giner
- Sección de Gastroenterología y Nutrición, Hospital Infantil Universitario Niño Jesús, Madrid, Spain
| | - E Dulin
- Laboratorio de Cribado Neonatal, Hospital General Universitario Gregorio Marañón, Madrid, Spain
| | - R Yahyaoui
- Laboratorio de Metabolopatías, Hospital Regional de Málaga, Instituto de Investigación Biomédica de Málaga (IBIMA), Málaga, Spain
| | - J M Egea
- Centro de Bioquímica y Genética Clínica, Unidad de Metabolopatías, Hospital General Universitario Virgen de la Arrixaca, Murcia, Spain
| | - A Belanger-Quintana
- Unidad de Enfermedades Metabólicas, Servicio de Pediatría, Hospital Universitario Ramón y Cajal, Madrid, Spain
| | - J Blasco-Alonso
- Sección de Gastroenterología y Nutrición Pediátrica, Hospital Regional de Málaga, Málaga, Spain
| | - M L Fernandez Ruano
- Laboratorio de Cribado Neonatal, Hospital General Universitario Gregorio Marañón, Madrid, Spain
| | - B Besga
- Laboratorio de Cribado Neonatal, Hospital General Universitario Gregorio Marañón, Madrid, Spain
| | - I Ferrer-López
- Centro de Diagnóstico de Enfermedades Moleculares, Centro de Biología Molecular-SO UAM-CSIC, Universidad Autónoma de Madrid, Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), IdiPAZ, Madrid, Spain
| | - F Leal
- Centro de Diagnóstico de Enfermedades Moleculares, Centro de Biología Molecular-SO UAM-CSIC, Universidad Autónoma de Madrid, Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), IdiPAZ, Madrid, Spain
| | - M Ugarte
- Centro de Diagnóstico de Enfermedades Moleculares, Centro de Biología Molecular-SO UAM-CSIC, Universidad Autónoma de Madrid, Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), IdiPAZ, Madrid, Spain
| | - P Ruiz-Sala
- Centro de Diagnóstico de Enfermedades Moleculares, Centro de Biología Molecular-SO UAM-CSIC, Universidad Autónoma de Madrid, Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), IdiPAZ, Madrid, Spain
| | - B Pérez
- Centro de Diagnóstico de Enfermedades Moleculares, Centro de Biología Molecular-SO UAM-CSIC, Universidad Autónoma de Madrid, Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), IdiPAZ, Madrid, Spain
| | - C Pérez-Cerdá
- Centro de Diagnóstico de Enfermedades Moleculares, Centro de Biología Molecular-SO UAM-CSIC, Universidad Autónoma de Madrid, Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), IdiPAZ, Madrid, Spain
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Jeantet A, Chassagneux Y, Raynaud C, Roussignol P, Lauret JS, Besga B, Estève J, Reichel J, Voisin C. Widely Tunable Single-Photon Source from a Carbon Nanotube in the Purcell Regime. Phys Rev Lett 2016; 116:247402. [PMID: 27367407 DOI: 10.1103/physrevlett.116.247402] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Indexed: 05/27/2023]
Abstract
The narrow emission of a single carbon nanotube at low temperature is coupled to the optical mode of a fiber microcavity using the built-in spatial and spectral matching brought by this flexible geometry. A thorough cw and time-resolved investigation of the very same emitter both in free space and in cavity shows an efficient funneling of the emission into the cavity mode together with a strong emission enhancement corresponding to a Purcell factor of up to 5. At the same time, the emitted photons retain a strong sub-Poissonian statistics. By exploiting the cavity feeding effect on the phonon wings, we locked the emission of the nanotube at the cavity resonance frequency, which allowed us to tune the frequency over a 4 THz band while keeping an almost perfect antibunching. By choosing the nanotube diameter appropriately, this study paves the way to the development of carbon-based tunable single-photon sources in the telecom bands.
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Affiliation(s)
- A Jeantet
- Laboratoire Pierre Aigrain, École Normale Supérieure, CNRS, Université Pierre et Marie Curie, Université Paris Diderot, 24, rue Lhomond, F-75005 Paris, France
| | - Y Chassagneux
- Laboratoire Pierre Aigrain, École Normale Supérieure, CNRS, Université Pierre et Marie Curie, Université Paris Diderot, 24, rue Lhomond, F-75005 Paris, France
| | - C Raynaud
- Laboratoire Pierre Aigrain, École Normale Supérieure, CNRS, Université Pierre et Marie Curie, Université Paris Diderot, 24, rue Lhomond, F-75005 Paris, France
| | - Ph Roussignol
- Laboratoire Pierre Aigrain, École Normale Supérieure, CNRS, Université Pierre et Marie Curie, Université Paris Diderot, 24, rue Lhomond, F-75005 Paris, France
| | - J S Lauret
- Laboratoire Aimé Cotton, CNRS, École Normale Supérieure de Cachan, Universite Paris Sud, 91405 Orsay, France
| | - B Besga
- Laboratoire Kastler Brossel, École Normale Supérieure, CNRS, Université Pierre et Marie Curie, 24 rue Lhomond, F-75005 Paris, France
| | - J Estève
- Laboratoire Kastler Brossel, École Normale Supérieure, CNRS, Université Pierre et Marie Curie, 24 rue Lhomond, F-75005 Paris, France
| | - J Reichel
- Laboratoire Kastler Brossel, École Normale Supérieure, CNRS, Université Pierre et Marie Curie, 24 rue Lhomond, F-75005 Paris, France
| | - C Voisin
- Laboratoire Pierre Aigrain, École Normale Supérieure, CNRS, Université Pierre et Marie Curie, Université Paris Diderot, 24, rue Lhomond, F-75005 Paris, France
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