Optimal management of nutrient reserves in microorganisms under time-varying environmental conditions

Nev, Olga A.; Nev, Oleg A.; Berg, Hugo van den

doi:10.1016/j.jtbi.2017.06.015

Cited by 3 publications

(1 citation statement)

References 42 publications

(59 reference statements)

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“…After incubation, an increase in the number of gram‐negative bacteria was observed in control samples. An explanation of this phenomenon can be found in the work by Nev et al, [ 38 ] who posits that bacteria can accumulate nutrient reserves and use them in unfavorable conditions for their growth until they run out. All the more positive is the assessment of the lethal action of AgNO 3 ‐PLA cuboids against these bacteria.…”

Section: Resultsmentioning

confidence: 99%

Preparation of antimicrobial 3D printing filament: In situ thermal formation of silver nanoparticles during the material extrusion

et al. 2020

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Many efforts have been made either to provide the typical three-dimensional (3D) printing materials with new and specific properties or to enhance their overall stability. The use of nanomaterials in 3D printing is gaining attention due to the tremendous functionality that this approach provides for those materials. This article presents a method of producing poly(lactic acid) (PLA)silver nanoparticle antibacterial filament for additive manufacturing. Polymer dope of silver salts within PLA was prepared by the solution-phase and solvent-less methods, followed by extrusion into filaments. Silver nanoparticles were synthesized in situ by thermal decomposition of silver salt during the thermal extrusion of the filament. The formation and dispersion of the nanoparticles within the polymer structure were examined and confirmed with transmission electron microscope and X-ray diffraction. The solution-phase method proposed in this study may prevent failure with nanoparticle dispersion occurring in melt blending. The filament was used for the fabrication of predesigned specimens for antimicrobial and mechanical testing. Printed objects exhibited antimicrobial activity against Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa. This study revealed that the incorporation of silver nanoparticles (0.01-5 wt%) into PLA does not significantly change its bulk properties but renders the composite antibacterial. The

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Section: Resultsmentioning

confidence: 99%

Preparation of antimicrobial 3D printing filament: In situ thermal formation of silver nanoparticles during the material extrusion

et al. 2020

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Holling Type I versus Holling Type II functional responses in Gram-negative bacteria

Nev

Berg

2018

Transactions of Mathematics and Its Applications

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We consider how the double-membrane structure of the cell envelope of Gram-negative bacteria affects its functional response, which is the mathematical relationship that expresses how the nutrient uptake flux depends on environmental conditions. We show that, under suitable conditions, the Holling Type I functional response is a plausible model, as opposed to the Holling Type II (rectangular hyperbolic, ‘Michaelis–Menten’) response that is the default model in much of the literature. We investigate both diffusion-limited and capacity-limited regimes. Furthermore, we reconcile our findings with the preponderance in the established literature of hyperbolic models for the growth response, which are generally assumed to be valid, for both Gram-negative and Gram-positive bacteria. Finally, we consider the phenomenon of dynamic adjustment of investment of molecular building blocks in cellular components, and show how this will affect the functional response as observed by the experimenter.

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Corporate Tax Avoidance and Honoring the Fiduciary Duties Owed to the Corporation and Its Stockholders

Chaffee

Davis-Nozemack

2017

SSRN Journal

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Corporate tax avoidance is a pressing issue of both national and international concern. Corporations usually claim that they are legally required to engage in aggressive tax strategies. But this Article proves that claim is incorrect when based upon the fiduciary duties owed to the corporation and its stockholders. Directors and other corporate managers often look to the classic case of Dodge v. Ford, which is ubiquitous in corporate law from the boardroom to the courtroom, as a North Star that guides them toward and defines their fiduciary duties to the corporation and its stockholders. In Dodge, the court held, "A business corporation is organized and carried on primarily for the profit of the stockholders. The powers of the directors are to be employed for that end." This holding has been interpreted by many directors and other corporate managers not only as a decree to relentlessly seek profit, but also as an absolute edict to maximize profits, even if it means hurting society, damaging the environment, or destroying anything standing in the corporation's path. The problem is that this interpretation of the Dodge mandate is wrong. The mandate requires only that directors and other corporate managers run the corporation "primarily for the profit of the stockholders," leaving room for other secondary considerations. Beyond that, many limitations on the Dodge mandate exist, including the business judgment rule, which gives directors and other corporate managers substantial discretion in running the corporation. The Dodge mandate, while offering general guidance as to how a corporation should be run, i.e. "primarily for the profit of the stockholders," utterly fails to offer guidance in assessing any specific analysis. As a result, other doctrines are needed to fill this gap. This Article discusses some of the doctrines, including corporate social responsibility, sustainability, and economics, that should be employed to protect society from the damage that tax avoid

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Optimal management of nutrient reserves in microorganisms under time-varying environmental conditions

Cited by 3 publications

References 42 publications

Preparation of antimicrobial 3D printing filament: In situ thermal formation of silver nanoparticles during the material extrusion

Preparation of antimicrobial 3D printing filament: In situ thermal formation of silver nanoparticles during the material extrusion

Holling Type I versus Holling Type II functional responses in Gram-negative bacteria

Corporate Tax Avoidance and Honoring the Fiduciary Duties Owed to the Corporation and Its Stockholders

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