LIVIVO - Das Suchportal für Lebenswissenschaften

switch to English language
Erweiterte Suche

Suchergebnis

Treffer 1 - 10 von insgesamt 51

Suchoptionen

  1. Artikel ; Online: Stopping a reaction-diffusion front.

    Caputo, Jean-Guy / Cruz-Pacheco, Gustavo / Sarels, Benoît

    Physical review. E

    2021  Band 103, Heft 3-1, Seite(n) 32210

    Abstract: We revisit the problem of pinning a reaction-diffusion front by a defect, in particular by a reaction-free region. Using collective variables for the front and numerical simulations, we compare the behaviors of a bistable and monostable front. A bistable ...

    Abstract We revisit the problem of pinning a reaction-diffusion front by a defect, in particular by a reaction-free region. Using collective variables for the front and numerical simulations, we compare the behaviors of a bistable and monostable front. A bistable front can be pinned as confirmed by a pinning criterion, the analysis of the time independent problem, and simulations. Conversely, a monostable front can never be pinned, it gives rise to a secondary pulse past the defect and we calculate the time this pulse takes to appear. These radically different behaviors of bistable and monostable fronts raise issues for modelers in particular areas of biology, as for example, the study of tumor growth in the presence of different tissues.
    Sprache Englisch
    Erscheinungsdatum 2021-04-16
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 2844562-4
    ISSN 2470-0053 ; 2470-0045
    ISSN (online) 2470-0053
    ISSN 2470-0045
    DOI 10.1103/PhysRevE.103.032210
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  2. Artikel ; Online: Applying a multi-strain dengue model to epidemics data.

    de Araújo, Robert G S / Jorge, Daniel C P / Dorn, Rejane C / Cruz-Pacheco, Gustavo / Esteva, M Lourdes M / Pinho, Suani T R

    Mathematical biosciences

    2023  Band 360, Seite(n) 109013

    Abstract: Dengue disease transmission is a complex vector-borne disease, mainly due to the co-circulation of four serotypes of the virus. Mathematical models have proved to be a useful tool to understand the complexity of this disease. In this work, we extend the ... ...

    Abstract Dengue disease transmission is a complex vector-borne disease, mainly due to the co-circulation of four serotypes of the virus. Mathematical models have proved to be a useful tool to understand the complexity of this disease. In this work, we extend the model studied by Esteva et al., 2003, originally proposed for two serotypes, to four circulating serotypes. Using epidemic data of dengue fever in Iquitos (Peru) and San Juan (Puerto Rico), we estimate numerically the co-circulation parameter values for selected outbreaks using a bootstrap method, and we also obtained the Basic Reproduction Number, R
    Mesh-Begriff(e) Humans ; Dengue ; Dengue Virus ; Epidemics ; Disease Outbreaks ; Serogroup
    Sprache Englisch
    Erscheinungsdatum 2023-04-29
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1126-5
    ISSN 1879-3134 ; 0025-5564
    ISSN (online) 1879-3134
    ISSN 0025-5564
    DOI 10.1016/j.mbs.2023.109013
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  3. Artikel: DISPERSION OF A NEW CORONAVIRUS SARS-COV-2 BY AIRLINES IN 2020: TEMPORAL ESTIMATES OF THE OUTBREAK IN MEXICO.

    Cruz-Pacheco, Gustavo / Bustamante-Castañeda, José F / Caputo, Jean G / Jiménez-Corona, María E / Ponce-de-León-Rosales, Samuel

    Revista de investigacion clinica; organo del Hospital de Enfermedades de la Nutricion

    2020  Band 72, Heft 3, Seite(n) 138–143

    Abstract: Background: On January 23, 2020, China imposed a quarantine on the city of Wuhan to contain the SARS-CoV-2 outbreak. Regardless of this measure, the new infection has spread to several countries around the world.: Objective: We developed a method to ... ...

    Abstract Background: On January 23, 2020, China imposed a quarantine on the city of Wuhan to contain the SARS-CoV-2 outbreak. Regardless of this measure, the new infection has spread to several countries around the world.
    Objective: We developed a method to study the dissemination of this infection by airline routes and provide estimations of the time of arrival of the outbreak to different cities.
    Methods: Using the Kermack and McKendrick model complemented with diffusion on a graph composed of nodes and edges, we made an analysis of COVID-19 dispersion to other cities by air travel.
    Results: The estimation was accurate in that it was possible to predict in the middle of February 2020 the arrival of the first outbreak in Mexico, which eventually occurred between March 20 and 30. This estimation was robust with respect to small changes in epidemiological parameters at the other nodes.
    Conclusions: The estimation of the time of arrival of the outbreak from its epicenter, allows for a time period to implement and strengthen preventive measures aimed at the general population as well as to strengthen hospital infrastructure and training of human resources. In the present study, this estimation was accurate, as observed from the real data of the beginning of the outbreak in Mexico City up to April 6, 2020.
    Mesh-Begriff(e) Air Travel ; Betacoronavirus ; COVID-19 ; China/epidemiology ; Coronavirus Infections/epidemiology ; Coronavirus Infections/prevention & control ; Coronavirus Infections/transmission ; Disease Outbreaks/prevention & control ; Geography, Medical ; Humans ; Mexico/epidemiology ; Models, Theoretical ; Pandemics/prevention & control ; Pneumonia, Viral/epidemiology ; Pneumonia, Viral/prevention & control ; Pneumonia, Viral/transmission ; SARS-CoV-2 ; Time Factors ; Travel-Related Illness ; Urban Health
    Schlagwörter covid19
    Sprache Englisch
    Erscheinungsdatum 2020-06-25
    Erscheinungsland Mexico
    Dokumenttyp Journal Article
    ZDB-ID 138348-6
    ISSN 0034-8376
    ISSN 0034-8376
    DOI 10.24875/RIC.20000113
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  4. Artikel ; Online: Vaccination strategies for SIR vector-transmitted diseases.

    Cruz-Pacheco, Gustavo / Esteva, Lourdes / Vargas, Cristobal

    Bulletin of mathematical biology

    2014  Band 76, Heft 8, Seite(n) 2073–2090

    Abstract: Vector-borne diseases are one of the major public health problems in the world with the fastest spreading rate. Control measures have been focused on vector control, with poor results in most cases. Vaccines should help to reduce the diseases incidence, ... ...

    Abstract Vector-borne diseases are one of the major public health problems in the world with the fastest spreading rate. Control measures have been focused on vector control, with poor results in most cases. Vaccines should help to reduce the diseases incidence, but vaccination strategies should also be defined. In this work, we propose a vector-transmitted SIR disease model with age-structured population subject to a vaccination program. We find an expression for the age-dependent basic reproductive number R(0), and we show that the disease-free equilibrium is locally stable for R(0) ≤ 1, and a unique endemic equilibrium exists for R(0) > 1. We apply the theoretical results to public data to evaluate vaccination strategies, immunization levels, and optimal age of vaccination for dengue disease.
    Mesh-Begriff(e) Age Factors ; Animals ; Basic Reproduction Number ; Computer Simulation ; Dengue/immunology ; Dengue/prevention & control ; Dengue/virology ; Dengue Vaccines/immunology ; Dengue Virus/immunology ; Humans ; Insect Vectors/immunology ; Insect Vectors/virology ; Models, Immunological ; Vaccination/methods ; Vaccination/standards
    Chemische Substanzen Dengue Vaccines
    Sprache Englisch
    Erscheinungsdatum 2014-08
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 184905-0
    ISSN 1522-9602 ; 0007-4985 ; 0092-8240
    ISSN (online) 1522-9602
    ISSN 0007-4985 ; 0092-8240
    DOI 10.1007/s11538-014-9999-6
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  5. Artikel: Control measures for Chagas disease

    Cruz-Pacheco, Gustavo / Esteva, Lourdes / Vargas, Cristobal

    Mathematical biosciences. 2012 , v. 237, no. 1-2

    2012  

    Abstract: Chagas disease, also known as American trypanosomiasis, is a potentially life-threatening illness caused by the protozoan parasite, Trypanosoma cruzi. The main mode of transmission of this disease in endemic areas is through an insect vector called ... ...

    Abstract Chagas disease, also known as American trypanosomiasis, is a potentially life-threatening illness caused by the protozoan parasite, Trypanosoma cruzi. The main mode of transmission of this disease in endemic areas is through an insect vector called triatomine bug. Triatomines become infected with T. cruzi by feeding blood of an infected person or animal. Chagas disease is considered the most important vector borne infection in Latin America. It is estimated that between 16 and 18millions of persons are infected with T. cruzi, and at least 20,000 deaths each year. In this work we formulate a model for the transmission of this infection among humans, vectors and domestic mammals. Our main objective is to assess the effectiveness of Chagas disease control measures. For this, we do sensitivity analysis of the basic reproductive number R₀ and the endemic proportions with respect to epidemiological and demographic parameters.
    Schlagwörter Chagas disease ; Triatominae ; Trypanosoma cruzi ; blood ; control methods ; disease control ; disease transmission ; humans ; insect vectors ; models ; parasites ; people ; Latin America
    Sprache Englisch
    Erscheinungsverlauf 2012-05
    Umfang p. 49-60.
    Erscheinungsort Elsevier Inc.
    Dokumenttyp Artikel
    ZDB-ID 1126-5
    ISSN 1879-3134 ; 0025-5564
    ISSN (online) 1879-3134
    ISSN 0025-5564
    DOI 10.1016/j.mbs.2012.03.005
    Datenquelle NAL Katalog (AGRICOLA)

    Zusatzmaterialien

    Kategorien

  6. Artikel ; Online: Multi-species interactions in West Nile virus infection.

    Cruz-Pacheco, Gustavo / Esteva, Lourdes / Vargas, Cristobal

    Journal of biological dynamics

    2012  Band 6, Seite(n) 281–298

    Abstract: In this paper, we analyse the interaction of different species of birds and mosquitoes on the dynamics of West Nile virus (WNV) infection. We study the different transmission efficiencies of the vectors and birds and the impact on the possible outbreaks. ...

    Abstract In this paper, we analyse the interaction of different species of birds and mosquitoes on the dynamics of West Nile virus (WNV) infection. We study the different transmission efficiencies of the vectors and birds and the impact on the possible outbreaks. We show that the basic reproductive number is the weighted mean of the basic reproductive number of each species, weighted by the relative abundance of its population in the location. These results suggest a possible explanation of why there are no outbreaks of WNV in Mexico.
    Mesh-Begriff(e) Animals ; Birds/virology ; Culicidae/virology ; Insect Vectors/virology ; North America/epidemiology ; Population Density ; Species Specificity ; Time Factors ; West Nile Fever/epidemiology ; West Nile Fever/transmission ; West Nile Fever/virology ; West Nile virus/physiology
    Sprache Englisch
    Erscheinungsdatum 2012
    Erscheinungsland England
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1751-3766
    ISSN (online) 1751-3766
    DOI 10.1080/17513758.2011.571721
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  7. Artikel ; Online: Control measures for Chagas disease.

    Cruz-Pacheco, Gustavo / Esteva, Lourdes / Vargas, Cristobal

    Mathematical biosciences

    2012  Band 237, Heft 1-2, Seite(n) 49–60

    Abstract: Chagas disease, also known as American trypanosomiasis, is a potentially life-threatening illness caused by the protozoan parasite, Trypanosoma cruzi. The main mode of transmission of this disease in endemic areas is through an insect vector called ... ...

    Abstract Chagas disease, also known as American trypanosomiasis, is a potentially life-threatening illness caused by the protozoan parasite, Trypanosoma cruzi. The main mode of transmission of this disease in endemic areas is through an insect vector called triatomine bug. Triatomines become infected with T. cruzi by feeding blood of an infected person or animal. Chagas disease is considered the most important vector borne infection in Latin America. It is estimated that between 16 and 18 millions of persons are infected with T. cruzi, and at least 20,000 deaths each year. In this work we formulate a model for the transmission of this infection among humans, vectors and domestic mammals. Our main objective is to assess the effectiveness of Chagas disease control measures. For this, we do sensitivity analysis of the basic reproductive number R₀ and the endemic proportions with respect to epidemiological and demographic parameters.
    Mesh-Begriff(e) Animals ; Chagas Disease/epidemiology ; Chagas Disease/prevention & control ; Chagas Disease/transmission ; Computer Simulation ; Humans ; Insect Control/standards ; Insect Vectors/parasitology ; Latin America/epidemiology ; Models, Biological ; Rural Population ; Triatominae/parasitology ; Trypanosoma cruzi/growth & development
    Sprache Englisch
    Erscheinungsdatum 2012-05
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1126-5
    ISSN 1879-3134 ; 0025-5564
    ISSN (online) 1879-3134
    ISSN 0025-5564
    DOI 10.1016/j.mbs.2012.03.005
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  8. Buch ; Artikel ; Online: Dispersion of a new coronavirus SARS-CoV-2 by airlines in 2020

    Cruz-Pacheco, Gustavo / Bustamante-Castañeda, J.F. / Caputo, Jean-Guy / Jiménez-Corona, M.E. / Ponce-de-León, S.

    https://hal.archives-ouvertes.fr/hal-02507142 ; 2020

    Temporal estimates of the outbreak in Mexico

    2020  

    Abstract: On January 23, 2020, China imposed a quarantine on the city of Wuhan to contain the Covid-19 outbreak. In this work we show an analysis of the dispersion of this infection to other cities by airlines based on the classic model the Kermack and McKendrick ... ...

    Abstract On January 23, 2020, China imposed a quarantine on the city of Wuhan to contain the Covid-19 outbreak. In this work we show an analysis of the dispersion of this infection to other cities by airlines based on the classic model the Kermack and McKendrick complemented with diffusion on a graph. The main purpose is to give estimates of the arrival virus and times of the outbreak to other locations. We use Mexico City as an example. In this case, our estimate of the arrival time is around March 20, 2020. This analysis is limited to the analysis of dispersion by airlines, so this estimate should be takenAs an overestimate since the infection can arrive by other means. Last, we show that these estimates are robust to small variations of epidemiological parameters.
    Schlagwörter outbreak ; COVID-19 ; coronavirus ; SARS-CoV-2 ; [SDV.SPEE]Life Sciences [q-bio]/Santé publique et épidémiologie ; [MATH.MATH-DS]Mathematics [math]/Dynamical Systems [math.DS] ; covid19
    Sprache Englisch
    Erscheinungsdatum 2020-03-12
    Verlag HAL CCSD
    Erscheinungsland fr
    Dokumenttyp Buch ; Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

    Zusatzmaterialien

    Kategorien

  9. Buch ; Artikel ; Online: Dispersion of a new coronavirus SARS-CoV-2 by airlines in 2020

    Cruz-Pacheco, Gustavo / Bustamante-Castañeda, J.F. / Caputo, Jean-Guy / Jiménez-Corona, M.E. / Ponce-de-León, S.

    https://hal.archives-ouvertes.fr/hal-02507142 ; 2020

    Temporal estimates of the outbreak in Mexico

    2020  

    Abstract: On January 23, 2020, China imposed a quarantine on the city of Wuhan to contain the Covid-19 outbreak. In this work we show an analysis of the dispersion of this infection to other cities by airlines based on the classic model the Kermack and McKendrick ... ...

    Abstract On January 23, 2020, China imposed a quarantine on the city of Wuhan to contain the Covid-19 outbreak. In this work we show an analysis of the dispersion of this infection to other cities by airlines based on the classic model the Kermack and McKendrick complemented with diffusion on a graph. The main purpose is to give estimates of the arrival virus and times of the outbreak to other locations. We use Mexico City as an example. In this case, our estimate of the arrival time is around March 20, 2020. This analysis is limited to the analysis of dispersion by airlines, so this estimate should be takenAs an overestimate since the infection can arrive by other means. Last, we show that these estimates are robust to small variations of epidemiological parameters.
    Schlagwörter outbreak ; COVID-19 ; coronavirus ; SARS-CoV-2 ; [SDV.SPEE]Life Sciences [q-bio]/Santé publique et épidémiologie ; [MATH.MATH-DS]Mathematics [math]/Dynamical Systems [math.DS] ; covid19
    Sprache Englisch
    Erscheinungsdatum 2020-03-12
    Verlag HAL CCSD
    Erscheinungsland fr
    Dokumenttyp Buch ; Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

    Zusatzmaterialien

    Kategorien

  10. Buch ; Artikel ; Online: Dispersion of a new coronavirus SARS-CoV-2 by airlines in 2020

    Cruz-Pacheco, Gustavo / Bustamante-Castañeda, J.F. / Caputo, Jean-Guy / Jiménez-Corona, M.E. / Ponce-de-León, S.

    https://hal.archives-ouvertes.fr/hal-02507142 ; 2020

    Temporal estimates of the outbreak in Mexico

    2020  

    Abstract: On January 23, 2020, China imposed a quarantine on the city of Wuhan to contain the Covid-19 outbreak. In this work we show an analysis of the dispersion of this infection to other cities by airlines based on the classic model the Kermack and McKendrick ... ...

    Abstract On January 23, 2020, China imposed a quarantine on the city of Wuhan to contain the Covid-19 outbreak. In this work we show an analysis of the dispersion of this infection to other cities by airlines based on the classic model the Kermack and McKendrick complemented with diffusion on a graph. The main purpose is to give estimates of the arrival virus and times of the outbreak to other locations. We use Mexico City as an example. In this case, our estimate of the arrival time is around March 20, 2020. This analysis is limited to the analysis of dispersion by airlines, so this estimate should be takenAs an overestimate since the infection can arrive by other means. Last, we show that these estimates are robust to small variations of epidemiological parameters.
    Schlagwörter outbreak ; COVID-19 ; coronavirus ; SARS-CoV-2 ; [SDV.SPEE]Life Sciences [q-bio]/Santé publique et épidémiologie ; [MATH.MATH-DS]Mathematics [math]/Dynamical Systems [math.DS] ; covid19
    Sprache Englisch
    Erscheinungsdatum 2020-03-12
    Verlag HAL CCSD
    Erscheinungsland fr
    Dokumenttyp Buch ; Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

    Zusatzmaterialien

    Kategorien

Zum Seitenanfang