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  1. Book ; Online ; E-Book: Psammic peinobiomes

    Zinck, Joseph Alfred / Huber, Otto / García Montero, Pedro / Medina, Ernesto

    nutrient-limited ecosystems of the upper Orinoco and Rio Negro Basins

    (Ecological Studies, analysis and synthesis ; volume 247)

    2023  

    Author's details Joseph Alfred Zinck, Otto Huber, Pedro García Montero, Ernesto Medina, editors
    Series title Ecological Studies, analysis and synthesis ; volume 247
    Ecological studies
    Ecological studies, analysis and synthesis
    Collection Ecological studies
    Ecological studies, analysis and synthesis
    Keywords Biotic communities ; Soil science ; Plant ecology ; Geomorphology ; Ecophysiology ; Conservation biology ; Ecology
    Language English
    Size 1 Online-Ressource (xiv, 541 Seiten), Illustrationen
    Publisher Springer International Publishing
    Publishing place Cham
    Publishing country Switzerland
    Document type Book ; Online ; E-Book
    Remark Zugriff für angemeldete ZB MED-Nutzerinnen und -Nutzer
    HBZ-ID HT030399395
    ISBN 978-3-031-20799-0 ; 9783031207983 ; 3-031-20799-8 ; 303120798X
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

    Full text online

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  2. Article ; Online: Joint Probabilities Approach to Quantum Games with Noise.

    Legón, Alexis R / Medina, Ernesto

    Entropy (Basel, Switzerland)

    2023  Volume 25, Issue 8

    Abstract: A joint probability formalism for quantum games with noise is proposed, inspired by the formalism of non-factorizable probabilities that connects the joint probabilities to quantum games with noise. Using this connection, we show that the joint ... ...

    Abstract A joint probability formalism for quantum games with noise is proposed, inspired by the formalism of non-factorizable probabilities that connects the joint probabilities to quantum games with noise. Using this connection, we show that the joint probabilities are non-factorizable; thus, noise does not generically destroy entanglement. This formalism was applied to the Prisoner's Dilemma, the Chicken Game, and the Battle of the Sexes, where noise is coupled through a single parameter μ. We find that for all the games except for the Battle of the Sexes, the Nash inequalities are maintained up to a threshold value of the noise. Beyond the threshold value, the inequalities no longer hold for quantum and classical strategies. For the Battle of the sexes, the Nash inequalities always hold, no matter the noise strength. This is due to the symmetry and anti-symmetry of the parameters that determine the joint probabilities for that game. Finally, we propose a new correlation measure for the games with classical and quantum strategies, where we obtain that the incorporation of noise, when we have quantum strategies, does not affect entanglement, but classical strategies result in behavior that approximates quantum games with quantum strategies without the need to saturate the system with the maximum value of noise. In this manner, these correlations can be understood as entanglement for our game approach.
    Language English
    Publishing date 2023-08-16
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2014734-X
    ISSN 1099-4300 ; 1099-4300
    ISSN (online) 1099-4300
    ISSN 1099-4300
    DOI 10.3390/e25081222
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Dilemma breaking in quantum games by joint probabilities approach.

    Legón, Alexis R / Medina, Ernesto

    Scientific reports

    2022  Volume 12, Issue 1, Page(s) 13470

    Abstract: Classical games get fundamentally modified in the quantum realm because of non-locality and entanglement, that bypass some of the crucial features of the classical problem that define a dilemma. We will analyze how the dilemma can be shunted and even ... ...

    Abstract Classical games get fundamentally modified in the quantum realm because of non-locality and entanglement, that bypass some of the crucial features of the classical problem that define a dilemma. We will analyze how the dilemma can be shunted and even completely eliminated by the players using quantum strategies from the viewpoint of joint probabilities. In this approach, the game information (entropy) needs to be incorporated into the game strategies. We also connect the potential of the formalism of quantum games with the transmission of quantum information in quantum noisy channels and recent considerations of the connection between thermalization mechanisms in statistical mechanics, the many body problem and cooperative games considered here in the quantum regime.
    Language English
    Publishing date 2022-08-05
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-022-17072-8
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  4. Article ; Online: Dietary Intake and Supplement Use in Competitive Women Bodybuilders.

    Haubenstricker, John E / Lee, Jerry W / Segovia-Siapco, Gina / Medina, Ernesto

    Sports (Basel, Switzerland)

    2023  Volume 11, Issue 8

    Abstract: 1) Background: Women bodybuilders use extreme diets, dietary supplementation, and training regimes to sculpt their physiques. Women's participation in bodybuilding competitions has increased since the 1980s. Currently, studies on their dietary intake ... ...

    Abstract (1) Background: Women bodybuilders use extreme diets, dietary supplementation, and training regimes to sculpt their physiques. Women's participation in bodybuilding competitions has increased since the 1980s. Currently, studies on their dietary intake and supplement use are limited. Their dietary intake may be of poor quality and low in several micronutrients, while supplement use appears to be omnipresent. Thus, the aim of this study was to examine and compare the dietary intake, supplement use, and diet quality of in-season and off-season women bodybuilders. (2) Methods: In a cross-sectional design, we compared dietary intake, supplement use, and diet quality between seasons in women bodybuilders (
    Language English
    Publishing date 2023-08-18
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2704239-X
    ISSN 2075-4663 ; 2075-4663
    ISSN (online) 2075-4663
    ISSN 2075-4663
    DOI 10.3390/sports11080158
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  5. Article ; Online: The theory of planned behavior and dietary behaviors in competitive women bodybuilders.

    Haubenstricker, John E / Lee, Jerry W / Segovia-Siapco, Gina / Medina, Ernesto

    BMC public health

    2023  Volume 23, Issue 1, Page(s) 1716

    Abstract: Background: Women bodybuilders build their ideal physique by manipulating their diet, supplement, and exercise regimens to extreme levels. Excess protein intake and dietary supplement use is ubiquitous in women bodybuilders preparing for a competition, ... ...

    Abstract Background: Women bodybuilders build their ideal physique by manipulating their diet, supplement, and exercise regimens to extreme levels. Excess protein intake and dietary supplement use is ubiquitous in women bodybuilders preparing for a competition, i.e., in-season competitors, however the impetus for these two dietary behaviors are relatively unknown. The Theory of Planned Behavior (TPB) has been used to explain dietary behaviors. The purpose of the study was to examine how the TPB can explain protein intake and dietary supplement use in in-season competitors.
    Methods: Using a cross-sectional design, an online questionnaire was developed, validated, and administered to collect dietary supplement use, TPB variables, and other measures from 112 in-season competitors. Protein intake was assessed using multiple 24-h dietary recalls. Associations between TPB and protein intake and dietary supplement use were determined with multiple regression analysis while adjusting for confounders.
    Results: For protein intake: attitude, subjective norm, and perceived behavioral control explained 8% of the variance in intention; subjective norm independently predicted intention. Behavioral beliefs predicted attitude; subjective norm was predicted by trainer/coach, workout partners, and social media influencers. For dietary supplement use: intention explained 5% of the variance in dietary supplement use; attitude, subjective norm, and perceived behavioral control together explained 38% of the variance in intention. Attitudes towards dietary supplements use were predicted by five factors (not a waste of money, help improve physique, sustain energy levels, provide enough calories, help with recovery). Primary determinants of subjective norm were fellow competitors, social media influencers, and trainer/coach. Perceived behavioral control was predicted by three factors (ease of purchase, affordability to purchase, availability to purchase).
    Conclusions: TPB predicted dietary supplement use in women bodybuilders during in-season but there was little evidence for the prediction of protein intake using the TPB. Health professionals should develop effective interventions using strategies that align health education messages with in-season competitors' outcome beliefs and collaborate with their referent others to influence safer and effective dietary supplement use.
    MeSH term(s) Female ; Humans ; Cross-Sectional Studies ; Theory of Planned Behavior ; Behavior Control ; Dietary Supplements ; Intention
    Language English
    Publishing date 2023-09-04
    Publishing country England
    Document type Journal Article
    ZDB-ID 2041338-5
    ISSN 1471-2458 ; 1471-2458
    ISSN (online) 1471-2458
    ISSN 1471-2458
    DOI 10.1186/s12889-023-16568-w
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Radiation modulated spin coupling in a double-stranded DNA model.

    López, Alexander / Varela, Solmar / Medina, Ernesto

    Journal of physics. Condensed matter : an Institute of Physics journal

    2022  Volume 34, Issue 13

    Abstract: The spin activity in macromolecules such as DNA and oligopeptides, in the context of the chiral induced spin selectivity has been proposed to be due to the atomic spin-orbit coupling (SOC) and the associated chiral symmetry of the structures. This ... ...

    Abstract The spin activity in macromolecules such as DNA and oligopeptides, in the context of the chiral induced spin selectivity has been proposed to be due to the atomic spin-orbit coupling (SOC) and the associated chiral symmetry of the structures. This coupling, associated with carbon, nitrogen and oxygen atoms in biological molecules, albeit small (meV), can be enhanced by the geometry, and strong local polarization effects such as hydrogen bonding. A novel way to manipulate the spin degree of freedom is by modifying the spectrum using a coupling to the appropriate electromagnetic radiation field. Here we use the Floquet formalism in order to show how the half filled band Hamiltonian for DNA, can be modulated by the radiation to produce up to a tenfold increase of the effective SOC once the intrinsic coupling is present. On the other hand, the chiral model, once incorporating the orbital angular momentum of electron motion on the helix, opens a gap for different helicity states (helicity splitting) that chooses spin polarization according to transport direction and chirality, without breaking time reversal symmetry. The observed effects are feasible in physically reasonable parameter ranges for the radiation field amplitude and frequency.
    MeSH term(s) DNA/chemistry ; Electrons ; Hydrogen Bonding ; Motion ; Oligopeptides/chemistry
    Chemical Substances Oligopeptides ; DNA (9007-49-2)
    Language English
    Publishing date 2022-01-21
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1472968-4
    ISSN 1361-648X ; 0953-8984
    ISSN (online) 1361-648X
    ISSN 0953-8984
    DOI 10.1088/1361-648X/ac48c1
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  7. Article ; Online: Spin-phonon coupling in a double-stranded model of DNA.

    Peralta, Mayra / Feijoo, Steven / Varela, Solmar / Gutierrez, Rafael / Cuniberti, Gianaurelio / Mujica, Vladimiro / Medina, Ernesto

    The Journal of chemical physics

    2023  Volume 159, Issue 2

    Abstract: We address the electron-spin-phonon coupling in an effective model Hamiltonian for DNA to assess its role in spin transfer involved in the Chiral-Induced Spin Selectivity (CISS) effect. The envelope function approach is used to describe semiclassical ... ...

    Abstract We address the electron-spin-phonon coupling in an effective model Hamiltonian for DNA to assess its role in spin transfer involved in the Chiral-Induced Spin Selectivity (CISS) effect. The envelope function approach is used to describe semiclassical electron transfer in a tight-binding model of DNA at half filling in the presence of intrinsic spin-orbit coupling. Spin-phonon coupling arises from the orbital-configuration dependence of the spin-orbit interaction. We find spin-phonon coupling only for the acoustic modes, while the optical modes exhibit electron-phonon interaction without coupling to spin. We derive an effective Hamiltonian whose eigenstates carry spin currents that are protected by spin-inactive stretching optical modes. As optical phonons interact more strongly than acoustic phonons, side buckling and tilting optical base modes will be more strongly associated with decoherence, which allows for the two terminal spin filtering effects found in CISS.
    MeSH term(s) Phonons ; DNA ; Electron Transport ; Electrons
    Chemical Substances DNA (9007-49-2)
    Language English
    Publishing date 2023-07-11
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3113-6
    ISSN 1089-7690 ; 0021-9606
    ISSN (online) 1089-7690
    ISSN 0021-9606
    DOI 10.1063/5.0156347
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    In stock of ZB MED Bonn / Germany

    Z 4' 49/16: Show issues

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  8. Article ; Online: Reduction of the bulk modulus with polydispersity in noncohesive granular solids.

    Petit, Juan C / Medina, Ernesto

    Physical review. E

    2018  Volume 98, Issue 2-1, Page(s) 22903

    Abstract: We study the effect of grain polydispersity on the bulk modulus in noncohesive two-dimensional granular solids. Molecular dynamics simulations in two dimensions are used to describe polydisperse samples that reach a stationary limit after a number of ... ...

    Abstract We study the effect of grain polydispersity on the bulk modulus in noncohesive two-dimensional granular solids. Molecular dynamics simulations in two dimensions are used to describe polydisperse samples that reach a stationary limit after a number of hysteresis cycles. For stationary samples, we obtain that the packing with the highest polydispersity has the lowest bulk modulus. We compute the correlation between normal and tangential forces with grain size using the concept of branch vector or contact length. Classifying the contact lengths and forces by their size compared to the average length and average force, respectively, we find that strong normal and tangential forces are carried by large contact lengths, generally composed of at least one large grain. This behavior is more dominant as polydispersity increases, making force networks more anisotropic and removing the support, from small grains, in the loading direction thus reducing the bulk modulus of the granular pack. Our results for two dimensions describe qualitatively the results of three-dimensional experiments.
    Language English
    Publishing date 2018-09-16
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2844562-4
    ISSN 2470-0053 ; 2470-0045
    ISSN (online) 2470-0053
    ISSN 2470-0045
    DOI 10.1103/PhysRevE.98.022903
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Nanofluid Formulations Based on Two-Dimensional Nanoparticles, Their Performance, and Potential Application as Water-Based Drilling Fluids.

    Zamora-Ledezma, Camilo / Narváez-Muñoz, Christian / Guerrero, Víctor H / Medina, Ernesto / Meseguer-Olmo, Luis

    ACS omega

    2022  Volume 7, Issue 24, Page(s) 20457–20476

    Abstract: The development of sustainable, cost-efficient, and high-performance nanofluids is one of the current research topics within drilling applications. The inclusion of tailorable nanoparticles offers the possibility of formulating water-based fluids with ... ...

    Abstract The development of sustainable, cost-efficient, and high-performance nanofluids is one of the current research topics within drilling applications. The inclusion of tailorable nanoparticles offers the possibility of formulating water-based fluids with enhanced properties, providing unprecedented opportunities in the energy, oil, gas, water, or infrastructure industries. In this work, the most recent and relevant findings related with the development of customizable nanofluids are discussed, focusing on those based on the incorporation of 2D (two-dimensional) nanoparticles and environmentally friendly precursors. The advantages and drawbacks of using 2D layered nanomaterials including but not limited to silicon nano-glass flakes, graphene, MoS
    Language English
    Publishing date 2022-06-08
    Publishing country United States
    Document type Journal Article ; Review
    ISSN 2470-1343
    ISSN (online) 2470-1343
    DOI 10.1021/acsomega.2c02082
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  10. Book ; Conference proceedings: Physiological ecology of plants of the wet tropics

    Medina, Ernesto

    proceedings of an intern. symposium held in Oxatepec and Los Tuxtlas, Mexico, June 29 to July 6, 1983

    (Tasks for vegetation science ; 12)

    1984  

    Event/congress Symposium on the Physiological Ecology of Plants of the Lowland Wet Tropics (1983, Oaxtepec)
    Author's details [Symposium on the Physiological Ecology of Plants of the Lowland Wet Tropics]. Ed. by E. Medina
    Series title Tasks for vegetation science ; 12
    Collection
    Keywords Immerfeuchte Tropen ; Autökologie ; Pflanzen ; Pflanzenökologie
    Subject Ökologie ; Phytoökologie ; Vegetationsökologie ; Flora ; Pflanze ; Landpflanzen ; Physiologische Ökologie ; Ökophysiologie ; Ökologische Physiologie ; Autoökologie
    Language English
    Size VI, 254 S. : graph. Darst.
    Publisher Junk
    Publishing place The Hague u.a.
    Publishing country Netherlands
    Document type Book ; Conference proceedings
    HBZ-ID HT003292854
    ISBN 90-6193-952-6 ; 978-90-6193-952-8
    Database Catalogue ZB MED Nutrition, Environment, Agriculture

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    In stock of ZB MED Bonn / Germany

    Shelf markLoan statusLocation
    894/511 order for loan Geschlossenes Magazin (U2)

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