World's Best Scientists 2026 revealed!
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Microbiology
Portugal
2026

D-Index & Metrics

Microbiology

D-Index
68
Citations
12590
World Ranking
2213
National Ranking
6

Research.com Recognitions

  • 2026 - Research.com Microbiology in Portugal Leader Award
  • 2022 - Research.com Microbiology in Portugal Leader Award

Overview

Leonard Amaral is affiliated with Universidade Nova de Lisboa in Portugal. Their research spans several fields within the social sciences, with a particular focus on law and education. The scientist's interdisciplinary approach also touches on microbiology, information systems and management, and epidemiology.

The main fields of study represented in their publications include:

  • Social Sciences

Within these fields, Amaral's subfields are diverse, comprising:

  • Law
  • Education
  • Microbiology
  • Information Systems and Management
  • Epidemiology

Their research topics reveal a focus on issues relevant to Brazilian society and public health, including:

  • Brazilian Legal Issues
  • Academic Research in Diverse Fields
  • Business and Management Studies
  • Reproductive tract infections research
  • Microbial infections and disease research
  • Herpesvirus Infections and Treatments
  • Public Health in Brazil

Recent publications by Leonard Amaral demonstrate engagement with both legal and educational themes. Notable papers include:

  • "ARRENDAMENTO MERCANTIL COMO INSTRUMENTO DE PLANEJAMENTO TRIBUTÁRIO PARA O ARRENDATÁRIO NO BRASIL," published in 2024 in Revista Ibero-Americana de Humanidades, Ciências e Educação
  • "CRIMINALIZAÇÃO DO INADIMPLEMENTO DO ICMS," published in 2024 in Revista Ibero-Americana de Humanidades, Ciências e Educação
  • "RECONHECIMENTO DE UNIÃO ESTÁVEL POST MORTEM: PERSPECTIVAS LEGAIS E DESAFIOS PRÁTICOS," published in 2024 in Revista Ibero-Americana de Humanidades, Ciências e Educação
  • "TECNOLOGIAS NA SALA DE AULA," published in 2025 in Revista Ibero-Americana de Humanidades, Ciências e Educação
  • "LETRAMENTO DIGITAL E MULTILETRAMENTO," published in 2025 in Revista Ibero-Americana de Humanidades, Ciências e Educação

Amaral often collaborates with a group of recurring co-authors, including:

  • Valdenir Bandeira Gomes Júnior
  • Liliana Rodrigues
  • F. Leitão
  • Wanessa Rezende Silva
  • Eric Thomas Paiva Magalhães

The Revista Ibero-Americana de Humanidades, Ciências e Educação stands out as the primary venue for their work. Other publication venues include:

  • Venereology
  • Derecho y cambio social.

Best Publications

  • Multidrug Efflux Pumps in Staphylococcus aureus: an Update

    Sofia Santos Costa;Miguel Viveiros;Leonard Amaral;Isabel Couto

  • Mechanisms of drug efflux and strategies to combat them: Challenging the efflux pump of Gram-negative bacteria

    Jean-Marie Pagès;Leonard Amaral

  • Geraniol Restores Antibiotic Activities against Multidrug-Resistant Isolates from Gram-Negative Species

    Vannina Lorenzi;Alain Muselli;Antoine François Bernardini;Liliane Berti

  • Antibiotic stress, genetic response and altered permeability of E. coli.

    Miguel Viveiros;Myrielle Dupont;Liliana Rodrigues;Isabel Couto

  • Contribution of Efflux to the Emergence of Isoniazid and Multidrug Resistance in Mycobacterium tuberculosis

    Diana Machado;Isabel Couto;João Perdigão;Liliana Rodrigues

  • Clinical Concentrations of Thioridazine Kill Intracellular Multidrug-Resistant Mycobacterium tuberculosis

    Diane Ordway;Miguel Viveiros;Clara Leandro;Rosário Bettencourt

  • The potential management of resistant infections with non-antibiotics.

    Jette Elisabeth Kristiansen;Leonard Amaral

  • Fluorometric determination of ethidium bromide efflux kinetics in Escherichia coli

    Laura Paixão;Liliana Rodrigues;Isabel Couto;Marta Martins

  • Potential role of non-antibiotics (helper compounds) in the treatment of multidrug-resistant Gram-negative infections: mechanisms for their direct and indirect activities.

    Marta Martins;Sujata G. Dastidar;Seamus Fanning;Jette E. Kristiansen

  • Activity of phenothiazines against antibiotic-resistant Mycobacterium tuberculosis: a review supporting further studies that may elucidate the potential use of thioridazine as anti-tuberculosis therapy

    Leonard Amaral;Jette E. Kristiansen;Miguel Viveiros;Jorge Atouguia

  • New Roads Leading to Old Destinations: Efflux Pumps as Targets to Reverse Multidrug Resistance in Bacteria

    Gabriella Spengler;Annamária Kincses;Márió Gajdács;Leonard Amaral;Leonard Amaral

  • Demonstration of intrinsic efflux activity of Escherichia coli K-12 AG100 by an automated ethidium bromide method

    Miguel Viveiros;Ana Martins;Laura Paixão;Liliana Rodrigues

  • Inhibition of the respiration of multi-drug resistant clinical isolates of Mycobacterium tuberculosis by thioridazine: potential use for initial therapy of freshly diagnosed tuberculosis

    L. Amaral;J. E. Kristiansen;L. S. Abebe;W. Millett

  • Efflux-mediated response of Staphylococcus aureus exposed to ethidium bromide

    Isabel Couto;Sofia Santos Costa;Miguel Viveiros;Marta Martins

  • Efflux pumps of Gram-negative bacteria: what they do, how they do it, with what and how to deal with them

    Leonard Amaral;Ana Martins;Gabriella Spengler;Joseph Molnar

  • Inhibition of quorum-sensing signals by essential oils

    Mira Ágnes Szabó;Gábor Zoltán Varga;Judit Hohmann;Zsuzsanna Schelz

  • Enhancement of antibiotic activity against poly-drug resistant Mycobacterium tuberculosis by phenothiazines.

    Miguel Viveiros;Leonard Amaral

  • Antimicrobial Activity of Phenothiazines

    Leonard Amaral;Miguel Viveiros;Joseph Molnar

  • Contribution of efflux activity to isoniazid resistance in the Mycobacterium tuberculosis complex.

    Liliana Rodrigues;Diana Machado;Isabel Couto;Leonard Amaral

  • Inducement and Reversal of Tetracycline Resistance in Escherichia coli K-12 and Expression of Proton Gradient-Dependent Multidrug Efflux Pump Genes

    Miguel Viveiros;Ana R. Jesus;Mafalda Brito;Clara Leandro

  • Enhanced killing of intracellular multidrug-resistant Mycobacterium tuberculosis by compounds that affect the activity of efflux pumps

    Leonard Amaral;Marta Martins;Miguel Viveiros

Frequent Co-Authors

Miguel Viveiros
Miguel Viveiros Universidade Nova de Lisboa
Isabel Couto
Isabel Couto Universidade Nova de Lisboa
Joseph Molnár
Joseph Molnár University of Szeged
Marta Martins
Marta Martins Trinity College Dublin
Séamus Fanning
Séamus Fanning University College Dublin
Diane J. Ordway
Diane J. Ordway Colorado State University
José Melo-Cristino
José Melo-Cristino University of Lisbon
Jean-Marie Pagès
Jean-Marie Pagès Aix-Marseille University
Dick van Soolingen
Dick van Soolingen National Institute for Public Health and the Environment
Hazel M. Dockrell
Hazel M. Dockrell London School of Hygiene & Tropical Medicine

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