Osmel Martin

article

The optimal size of protocells from simple entropic considerations

Yoelsy Leyva, Osmel Martin, Noel Perez, José Suarez-Lezcano, more

European Biophysics Journal > 2019 > 48 > 3 > 277-283

Potential constraints on protocell size are developed from simple entropic considerations. To do that, two new different indexes as measures of their structural and dynamic order were developed and applied to an elemental model of the heterotrophic protocell. According to our results, cell size should be a key factor determining the potential of these primitive systems to evolve and consequently to...

article

Biological Evolution of Replicator Systems: Towards a Quantitative Approach

Osmel Martin, J. E. Horvath

Origins of Life and Evolution of Biospheres > 2013 > 43 > 2 > 151-160

The aim of this work is to study the features of a simple replicator chemical model of the relation between kinetic stability and entropy production under the action of external perturbations. We quantitatively explore the different paths leading to evolution in a toy model where two independent replicators compete for the same substrate. To do that, the same scenario described originally by Pross...

article

On the Photosynthetic Potential in the Very Early Archean Oceans

Daile Avila, Rolando Cardenas, Osmel Martin

Origins of Life and Evolution of Biospheres > 2013 > 43 > 1 > 67-75

In this work we apply a mathematical model of photosynthesis to quantify the potential for photosynthetic life in the very Early Archean oceans. We assume the presence of oceanic blockers of ultraviolet radiation, specifically ferrous ions. For this scenario, our results suggest a potential for photosynthetic life greater than or similar to that in later eras/eons, such as the Late Archean and the...

article

Modeling the onset of photosynthesis after the Chicxulub asteroid impact

Noel Perez, Rolando Cardenas, Osmel Martin, Reinaldo Rojas

Astrophysics and Space Science > 2013 > 343 > 1 > 7-10

We do a preliminary modelling of the photosynthetic rates of phytoplankton at the very beginning of the Paleogene, just after the impact of the Chicxulub asteroid, which decisively contributed to the last known mass extinction of the Phanerozoic eon. We assume the worst possible scenario from the photobiological point of view: an already clear atmosphere with no ozone, as the timescale for soot and...

article

The potential for photosynthesis in hydrothermal vents: a new avenue for life in the Universe?

Noel Perez, Rolando Cardenas, Osmel Martin, Leiva-Mora Michel

Astrophysics and Space Science > 2013 > 346 > 2 > 327-331

We perform a quantitative assessment for the potential for photosynthesis in hydrothermal vents in the deep ocean. The photosynthetically active radiation in this case is from geothermal origin: the infrared thermal radiation emitted by hot water, at temperatures ranging from 473 up to 673 K. We find that at these temperatures the photosynthetic potential is rather low in these ecosystems for most...

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Effects of gamma ray bursts in Earth’s biosphere

Osmel Martin, Rolando Cardenas, Mayrene Guimarais, Liuba Peñate, more

Astrophysics and Space Science > 2010 > 326 > 1 > 61-67

We continue former work on the modeling of potential effects of Gamma Ray Bursts on Phanerozoic Earth. We focus on global biospheric effects of ozone depletion and model the spectral reduction of light by NO₂ formed in the stratosphere. We also illustrate the current complexities involved in the prediction of how terrestrial ecosystems would respond to this kind of burst. We conclude that more biological...

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Short-term effects of gamma ray bursts on oceanic photosynthesis

Liuba Peñate, Osmel Martín, Rolando Cárdenas, Susana Agustí

Astrophysics and Space Science > 2010 > 330 > 2 > 211-217

We continue our previous work on the potential short-term influence of a gamma ray bursts on Earth’s biosphere, focusing on the only important short-term effect on life: the ultraviolet flash which occurs as a result of the retransmission of the γ radiation through the atmosphere. Thus, in this work we calculate the ultraviolet irradiances penetrating the first hundred meters of the water column,...

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Some Possible Dynamical Constraints for Life’s Origin

Osmel Martín, Liuba Peñate, Armando Alvaré, Rolando Cárdenas, more

Origins of Life and Evolution of Biospheres > 2009 > 39 > 6 > 533-544

Oscillating biochemical reactions are common in cell dynamics and could be closely related to the emergence of the life phenomenon itself. In this work, we study the dynamical features of some classical chemical or biochemical oscillators where the effect of cell volume changes is explicitly considered. Such analysis enables us to find some general conditions about the cell membrane to preserve such...

article

Short-term effects of gamma ray bursts on Earth

Osmel Martín, Douglas Galante, Rolando Cárdenas, J. E. Horvath

Astrophysics and Space Science > 2009 > 321 > 3-4 > 161-167

The aim of the present work is to study the potential short-term atmospheric and biospheric influence of Gamma Ray Bursts on the Earth. We focus in the ultraviolet flash at planet’s surface, which occurs as a result of the retransmission of the γ radiation through the atmosphere. This would be the only important short-term effect on life. We mostly consider Archean and Proterozoic eons, and for completeness...

article

Inhomogeneous models of interacting dark matter and dark energy

Roberto A. Sussman, Israel Quiros, Osmel Martín González

General Relativity and Gravitation > 2005 > 37 > 12 > 2117-2143

We derive and analyze a class of spherically symmetric cosmological models whose source is an interactive mixture of inhomogeneous cold dark matter (DM) and a generic homogeneous dark energy (DE) fluid. If the DE fluid corresponds to a quintessence scalar field, the interaction term can be associated with a well motivated non-minimal coupling to the DM component. By constructing a suitable volume...

article

Comments on the Paper astro-ph/0103335 by C. Rubano and P. Scudellaro

Rolando Cardenas, Tame Gonzalez, Osmel Martin, Israel Quiros, more

General Relativity and Gravitation > 2002 > 34 > 11 > 1877-1885

We briefly comment on a paper by Rubano and Scudellaro [Gen. Rel. Grav. 34 (2002) 307, astro-ph/0103335] where they found general exact solutions for two classes of exponential potentials in a scalar field model for quintessence. In that paper the authors were led to some interesting conclusions after a proper choice of the integration constants. By using dimensionless variables we show that the integration...

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Search results for: Osmel Martin

The optimal size of protocells from simple entropic considerations

Biological Evolution of Replicator Systems: Towards a Quantitative Approach

On the Photosynthetic Potential in the Very Early Archean Oceans

Modeling the onset of photosynthesis after the Chicxulub asteroid impact

The potential for photosynthesis in hydrothermal vents: a new avenue for life in the Universe?

Effects of gamma ray bursts in Earth’s biosphere

Short-term effects of gamma ray bursts on oceanic photosynthesis

Some Possible Dynamical Constraints for Life’s Origin

Short-term effects of gamma ray bursts on Earth

Inhomogeneous models of interacting dark matter and dark energy

Comments on the Paper astro-ph/0103335 by C. Rubano and P. Scudellaro

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