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In the present study, the Verhulst-Pearl growth model and the Malthusian growth model were used to model and understand the kinetics of Photobacterium sp exposed to lead. The results show that goodness of fit of the Verhulst-Pearl growth model was better that the Malthusian growth model. Therefore, the Verhulst-Pearl growth model is considered the best option for proving useful and reliable information about Photobacterium sp kinetics growth in vitro." } { "@context": "http://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": "1", "item": { "@id": "https://f1000research.com/", "name": "Home" } }, { "@type": "ListItem", "position": "2", "item": { "@id": "https://f1000research.com/browse/articles", "name": "Browse" } }, { "@type": "ListItem", "position": "3", "item": { "@id": "https://f1000research.com/articles/7-491/v1", "name": "Verhulst-Pearl growth model versus Malthusian growth model for in..." } } ] } Home Browse Verhulst-Pearl growth model versus Malthusian growth model for in... ALL Metrics - Views Downloads Get PDF Get XML Cite How to cite this article Ramirez-Cando LJ, Alvarez-Mendoza CI and Gutierrez-Salazar P. Verhulst-Pearl growth model versus Malthusian growth model for in vitro evaluation of lead removal in wastewater by Photobacterium sp [version 1; peer review: peer review discontinued] . F1000Research 2018, 7 :491 ( https://doi.org/10.12688/f1000research.14420.1 ) NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article. Close Copy Citation Details Export Export Citation Sciwheel EndNote Ref. Manager Bibtex ProCite Sente EXPORT Select a format first Track Share ▬ ✚ Brief Report Verhulst-Pearl growth model versus Malthusian growth model for in vitro evaluation of lead removal in wastewater by Photobacterium sp [version 1; peer review: peer review discontinued] Lenin Javier Ramirez-Cando https://orcid.org/0000-0002-4855-4796 1 , Cesar Ivan Alvarez-Mendoza 1 , Patricia Gutierrez-Salazar 1 Lenin Javier Ramirez-Cando https://orcid.org/0000-0002-4855-4796 1 , Cesar Ivan Alvarez-Mendoza 1 , Patricia Gutierrez-Salazar 1 PUBLISHED 25 Apr 2018 Author details Author details 1 Grupo de Investigación Ambiental para el Desarrollo Sustentable (GIADES), Universidad Politécnica Salesiana, Quito, 170801, Ecuador Lenin Javier Ramirez-Cando Roles: Data Curation, Formal Analysis, Project Administration, Writing – Original Draft Preparation Cesar Ivan Alvarez-Mendoza Roles: Data Curation, Methodology, Resources Patricia Gutierrez-Salazar Roles: Data Curation, Formal Analysis OPEN PEER REVIEW PEER REVIEW DISCONTINUED Abstract Mathematical modeling of microbial populations has a long history of application in the fields of ecology and environmental remediation. In the present study, the Verhulst-Pearl growth model and the Malthusian growth model were used to model and understand the kinetics of Photobacterium sp exposed to lead. The results show that goodness of fit of the Verhulst-Pearl growth model was better that the Malthusian growth model. Therefore, the Verhulst-Pearl growth model is considered the best option for proving useful and reliable information about Photobacterium sp kinetics growth in vitro . READ ALL READ LESS Keywords Photobacterium sp, Lead, Pb, Verhulst-Pearl growth model, Malthusian growth model Corresponding Author(s) Lenin Javier Ramirez-Cando ( [email protected] ) Close Corresponding author: Lenin Javier Ramirez-Cando Competing interests: No competing interests were disclosed. Grant information: This work was supported by Universidad Politécnica Salesiana. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Copyright: © 2018 Ramirez-Cando LJ et al . This is an open access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Data associated with the article are available under the terms of the Creative Commons Zero "No rights reserved" data waiver (CC0 1.0 Public domain dedication). How to cite: Ramirez-Cando LJ, Alvarez-Mendoza CI and Gutierrez-Salazar P. Verhulst-Pearl growth model versus Malthusian growth model for in vitro evaluation of lead removal in wastewater by Photobacterium sp [version 1; peer review: peer review discontinued] . F1000Research 2018, 7 :491 ( https://doi.org/10.12688/f1000research.14420.1 ) First published: 25 Apr 2018, 7 :491 ( https://doi.org/10.12688/f1000research.14420.1 ) Latest published: 25 Apr 2018, 7 :491 ( https://doi.org/10.12688/f1000research.14420.1 ) Introduction It is well-known that some genera of bacteria, such as Pseudomonas, Xanthomonas, Ferroxidans, Ralstonia, Acidobacillus 1 – 3 , have very interesting capacities as heavy metal remediating agents, since they are capable of extracting metals from solid substrates or transform them into harmless forms. Furthermore, bacteria can be used as bio absorbents for the recovery of metals and for the treatment of industrial effluents 4 , 5 . For this reason, the application of these technologies and research for continuous improvements is necessary. In a previous study, the application of Photobacterium sp to remove lead from wastewater was shown to be possible 6 . However, understanding the behavior of this strain within the experimental conditions was not studied. Particularly, computational modeling of the growth kinetics that aims to extract information about interactions between bacteria, nutrients and in this case the pollutant (lead; Pb) could be useful. For this reason, the present study intends to analyze growth of Photobacterium sp using two well-known mathematical models, the Verhulst-Pearl growth model and the Malthusian growth model 7 . These models have a long history of application in the fields of ecology, environmental remediation and industrial fermentation 8 . Methods The study uses kinetics data collected from the previous study in Quito-Ecuador, which studied the application of Photobacterium sp to remove lead from wastewater 6 . Briefly in the previous experiments, Photobacterium sp was exposed to two concentrations of Pb (20–100 ppm) in a general growth broth. The experiments were performed in times ranging between 0 and 86 hours, under a controlled temperature (25°C) and unsupervised at room temperature, ranging 5–23°C 6 at Quito-Ecuador. Malthusian growth model This model is often referred to as the mathematical exponential law (MEL). It is extensively adopted in the fields of agronomy, ecology or microbiology. The MEL is therefore seldom referred to as the Malthusian Law, which is a widely accepted view to study Malthusian growth in ecology and microbiology. The following equation was applied to the kinetics data in the present study: P t = P o e kt Where, P(t) is the population in a time, Po is the initial population, k is the specific growth rate and t is the time in hours. Verhulst-Pearl growth model For values of t in the domain of real numbers, the S-shaped curve is denoted by the model below. The initial stage of growth is approximately stationary and subsequent is nearly exponential; then, as saturation begins, the growth slows, and at maturity, growth stops as shown: The following equation was applied to the kinetics data in the present study: P t = P o + A 1 + e – k m ( t – t 0 ) Where, P(t) is the population in a time, Po is the initial population, km is the maximum growth rate and t is the time in hours. t0 represents the time to achieve the middle of the growth and A represents the carrying capacity of the broth tested. Data analysis All fittings were performed with sigmaplot 10, using minimum least squares, evaluating the goodness of fit using adjusted R-squared. Results Fitting a bacteria growth model aims to understand its kinetics. In Table 1 it is evident that Verhulst-Pearl model has a good performance since a R-squared > 0.90, which is considered as acceptable to model bacteria kinetics curves 5 , 9 . In these fitted curves, it is noticeable that room temperature parameters differed drastically from 25°C in carrying capacity (A) and middle time (to) to achieve middle biomass concentration. Therefore, these parameters suggest that 25°C controlled temperature increases the performance in both Pb concentrations. Room temperature seems to reduce the growth considering that Quito-Ecuador is located at 2800 m.a.s.l. Moreover, this model explains the reduction in maximum growth ratio due to the increase of Pb concentration. This effect is present at both temperature conditions ( Figure 1 ). Table 1. Results of modeling data with Verhulst-Pearl growth model. Temp=temperature, Pb=lead concentration in ppm. Temp Lead (ppm) A to km Po R-Sq 25°C 20 6.8E+08 33 0.141 6.0E+07 0.987 25°C 100 7.0E+08 41 0.081 8.8E+06 0.975 Room 20 5.2E+08 64 0.113 1.1E+08 0.916 Room 100 5.5E+08 62 0.085 1.4E+08 0.909 Figure 1. Modeling data with Verhulst-Pearl growth model. ( A ) 25°C, 20ppm lead; ( B ) Room temperature, 20ppm lead; ( C ) 25°C, 100ppm lead; and ( D ) Room temperature, 100ppm lead. Table 2 shows that the Malthusian growth model had an unacceptable goodness of fit, R-squared < 0.90 for all fitted curves. Therefore, this is considered as an unacceptable model for the bacteria kinetics curves tested. In these fitted curves, it is difficult see differences in temperature and Pb concentration. However, this model provides information about variations in growth ratio ( Figure 2 ). It would be difficult to extend analysis since this model does not fit as well as the Verhulst-Pearl growth model. Table 2. Results of modeling data with Malthusian growth model. Temp Lead (ppm) Po km R-Sq 25°C 20 2.33E+08 0.016 0.718 25°C 100 1.27E+08 0.022 0.866 Room 20 7.22E+07 0.025 0.886 Room 100 1.05E+08 0.021 0.892 Figure 2. Modeling data with Malthusian growth model. ( A ) 25°C, 20ppm lead; ( B ) Room temperature, 20ppm lead; ( C ) 25°C, 100ppm lead; and (D) Room temperature, 100ppm lead. Dataset 1. Kinetics data obtained in Ramirez-Cando et al.6. Uploaded with permission of all the authors. Conclusions Analysing the goodness of fit reveals that the Verhulst-Pearl growth model is the best option to model the kinetics of Photobacterium sp instead of the Malthusian growth model, at least in this particular case. Photobacterium sp is also suitable to remove lead from water as shown in Ramirez-Cando et al. 6 . The Malthusian model has no manner to estimate Carrying capacity since parameters in the model are developed to explain only the exponential growth phase. Moreover, parameters determined by Verhulst-Pearl growth model are very important in design further research and scaling to preindustrial process in microbiology as well as Monods model 10 . Data availability Dataset 1: Kinetics data obtained in Ramirez-Cando et al. 6 . Uploaded with permission of all the authors. 11 Competing interests No competing interests were disclosed. Grant information This work was supported by Universidad Politecnica Salesiana. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Faculty Opinions recommended References 1. Soto C, Gutiérrez S, Rey León A, et al. : Biotransformación de metales pesados presentes en lodos ribereños de los ríos Bogotá y Tunjuelo. Nova. 2010; 8 (4): 195–205. Publisher Full Text 2. Mohanasrinivasan V, Mishra M, Paliwal JS, et al. : Studies on heavy metal removal efficiency and antibacterial activity of chitosan prepared from shrimp shell waste. 3 Biotech. 2014; 4 (2): 167–175. ISSN 2190-572X. PubMed Abstract | Publisher Full Text | Free Full Text 3. Fu F, Wang Q: Removal of heavy metal ions from wastewaters: a review. J Environ Manage. 2011; 92 (3): 407–18. ISSN 03014797. PubMed Abstract | Publisher Full Text 4. 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Crit Rev Microbiol. 2016; 42 (6): 942–968. ISSN 1040-841X. PubMed Abstract | Publisher Full Text 9. Kallawicha K, Lung SC, Chuang YC, et al. : Spatiotemporal distributions and land-use regression models of ambient bacteria and endotoxins in the greater Taipei area. Aerosol Air Qual Res. 2015; 15 (4): 1448–1459. ISSN 20711409. Publisher Full Text 10. Shirsat N, Mohd A, Whelan J, et al. : Revisiting Verhulst and Monod models: analysis of batch and fed-batch cultures. Cytotechnology. 2015; 67 (3): 515–530. ISSN 15730778. PubMed Abstract | Publisher Full Text | Free Full Text 11. Ramirez-Cando LJ, Alvarez-Mendoza CI, Gutierrez-Salazar P: Dataset 1 in: Verhulst-Pearl growth model versus Malthusian growth model for in vitro evaluation of lead removal in wastewater by Photobacterium sp. F1000Research. 2018. Data Source Comments on this article Comments (0) Version 1 VERSION 1 PUBLISHED 25 Apr 2018 ADD YOUR COMMENT Comment Author details Author details 1 Grupo de Investigación Ambiental para el Desarrollo Sustentable (GIADES), Universidad Politécnica Salesiana, Quito, 170801, Ecuador Lenin Javier Ramirez-Cando Roles: Data Curation, Formal Analysis, Project Administration, Writing – Original Draft Preparation Cesar Ivan Alvarez-Mendoza Roles: Data Curation, Methodology, Resources Patricia Gutierrez-Salazar Roles: Data Curation, Formal Analysis Competing interests No competing interests were disclosed. Grant information This work was supported by Universidad Politécnica Salesiana. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Article Versions (1) version 1 Published: 25 Apr 2018, 7:491 https://doi.org/10.12688/f1000research.14420.1 Copyright © 2018 Ramirez-Cando LJ et al . This is an open access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Data associated with the article are available under the terms of the Creative Commons Zero "No rights reserved" data waiver (CC0 1.0 Public domain dedication). Download Export To Sciwheel Bibtex EndNote ProCite Ref. Manager (RIS) Sente metrics Views Downloads F1000Research - - PubMed Central info_outline Data from PMC are received and updated monthly. - - Citations open_in_new 0 open_in_new 0 open_in_new SEE MORE DETAILS CITE how to cite this article Ramirez-Cando LJ, Alvarez-Mendoza CI and Gutierrez-Salazar P. Verhulst-Pearl growth model versus Malthusian growth model for in vitro evaluation of lead removal in wastewater by Photobacterium sp [version 1; peer review: peer review discontinued] . F1000Research 2018, 7 :491 ( https://doi.org/10.12688/f1000research.14420.1 ) NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article. COPY CITATION DETAILS track receive updates on this article Track an article to receive email alerts on any updates to this article. TRACK THIS ARTICLE Share Peer review discontinued Peer review at F1000Research is author-driven. Currently no reviewers are being invited. What does this mean? Comments on this article Comments (0) Version 1 VERSION 1 PUBLISHED 25 Apr 2018 ADD YOUR COMMENT Comment keyboard_arrow_left keyboard_arrow_right Peer review discontinued Peer review at F1000Research is author-driven. Currently no reviewers are being invited. What does this mean? Comments on this article All Comments (0) Add a comment Sign up for content alerts Sign Up You are now signed up to receive this alert Browse by related subjects Alongside their report, reviewers assign a status to the article: Approved - the paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations - A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved - fundamental flaws in the paper seriously undermine the findings and conclusions Click here to access the data. The problem Spreadsheet data files may not format correctly if your computer is using different default delimiters (symbols used to separate values into separate cells) - a spreadsheet created in one region is sometimes misinterpreted by computers in other regions. You can change the regional settings on your computer so that the spreadsheet can be interpreted correctly. How to fix it Save downloaded CSV file Open spreadsheet program (e.g. Excel) Click the ‘Data’ tab at the top Click the ‘From text’ icon (top left) Browse for downloaded CSV file, click ‘Import’ Ensure ‘Delimited’ radio button is selected, click ‘Next’ Check one of the appropriate delimiter checkboxes (you can visualize the formatting by looking at the data preview below these options) Click ‘Finish’ Downloaded data do not display as expected? Download the data Dataset citation: Ramirez-Cando LJ, Alvarez-Mendoza CI and Gutierrez-Salazar P. Dataset 1 in: Verhulst-Pearl growth model versus Malthusian growth model for in vitro evaluation of lead removal in wastewater by Photobacterium sp . 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