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Bournazel M, Ma J, Billard F, Hertz E, Wu J, Boulet C, Faucher O, Hartmann JM. Quantum modeling, beyond secularity, of the collisional dissipation of molecular alignment using the energy-corrected sudden approximation. J Chem Phys 2023; 158:2887565. [PMID: 37125716 DOI: 10.1063/5.0150002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Accepted: 04/12/2023] [Indexed: 05/02/2023] Open
Abstract
We propose a Markovian quantum model for the time dependence of the pressure-induced decoherence of rotational wave packets of gas-phase molecules beyond the secular approximation. It is based on a collisional relaxation matrix constructed using the energy-corrected sudden approximation, which improves the previously proposed infinite order sudden one by taking the molecule rotation during collisions into account. The model is tested by comparisons with time-domain measurements of the pressure-induced decays of molecular-axis alignment features (revivals and echoes) for HCl and CO2 gases, pure and diluted in He. For the Markovian systems HCl-He and CO2-He, the comparisons between computed and measured data demonstrate the robustness of our approach, even when the secular approximation largely breaks down. In contrast, significant differences are obtained in the cases of pure HCl and CO2, for which the model underestimates the decay rate of the alignment at short times. This result is attributed to the non-Markovianity of HCl-HCl and CO2-CO2 interactions and the important contribution of those collisions that are ongoing at the time when the system is excited by the aligning laser pulse.
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Affiliation(s)
- M Bournazel
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
| | - J Ma
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
| | - F Billard
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
| | - E Hertz
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
| | - J Wu
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
| | - C Boulet
- Institut des Sciences Moléculaires d'Orsay, CNRS, Université Paris-Saclay, Orsay F-91405, France
| | - O Faucher
- Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, BP 47870, 21078 Dijon, France
| | - J-M Hartmann
- Laboratoire de Météorologie Dynamique/IPSL, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, Sorbonne Université, Ecole Normale Supérieure, Université PSL, F-91120 Palaiseau, France
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Bournazel M, Duclos MJ, Lecompte F, Guillou D, Peyronnet C, Quinsac A, Même N, Narcy A. Effects of dietary electrolyte balance and calcium supply on mineral and acid-base status of piglets fed a diversified diet. J Nutr Sci 2020; 9:e18. [PMID: 32528671 PMCID: PMC7264857 DOI: 10.1017/jns.2020.10] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Accepted: 04/23/2020] [Indexed: 01/28/2023] Open
Abstract
Dietary electrolyte balance (dEB) is known to affect acid-base status and mineral metabolism, but is rarely considered in diet formulation for pigs. Yet, the use of a wide variety of local feedstuffs in Europe contributes to lowering the dEB and increasing the fibre content. Hence, mineral requirements may be modified and skeletal health affected. Therefore, the effects of a lower dEB and a higher dietary Ca level on acid-base balance and mineral status were assessed in young pigs fed a diversified diet. A total of twenty-four weaned pigs were fed a control moderate-dEB diet (C) or a diversified moderate-dEB (D), low-dEB (D-A) or low-dEB supplemented with Ca (D-CA) diet. Growth performance, venous blood gas and chemistry, urine pH, mineral balance and femur characteristics were determined. With an equivalent dEB compared with the C diet, the D diet caused an acidification of the urine and increased the excretion of P as a result of a higher dietary content of S. Low-grade metabolic acidosis occurred in piglets fed the D-A diet with changes at systemic and urine levels. A higher excretion of ammonia and P in urine was observed and some bone characteristics tended to be negatively affected. Ca supplementation partially counteracted the effects of low-grade acidosis. Urine excretion of P and ammonia was alleviated and bone characteristics improved. In conclusion, a higher Ca supply must be considered in more diversified diets to counteract the risk of evolving towards low-grade metabolic acidosis which can negatively affect bone.
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Key Words
- ADG, average daily gain
- AR, apparent retention
- ATTD, apparent total tract digestibility
- Acid−base balance
- Bone
- C, control low-fibre diet
- Calcium
- D, diet enriched in local feedstuffs with a normal dietary electrolyte balance
- D-A, diet enriched in local feedstuffs with a low dietary electrolyte balance
- D-CA, D-A diet supplemented with Ca
- DDGS, distillers' dried grains with solubles
- Dietary electrolyte balance
- FCR, feed conversion ratio
- HU, Hounsfield units
- dEB, dietary electrolyte balance
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Affiliation(s)
- M. Bournazel
- INRAE, Université de Tours, UMR BOA, 37380Nouzilly, France
- MiXscience, Campus du Groupe Avril, 2/4 avenue de Ker Lann, 35172Bruz, France
| | - M. J. Duclos
- INRAE, Université de Tours, UMR BOA, 37380Nouzilly, France
| | - F. Lecompte
- Plateforme CIRE, Service imagerie, UMR 0085 PRC, INRA centre val de Loire, 37380Nouzilly, France
| | - D. Guillou
- MiXscience, Campus du Groupe Avril, 2/4 avenue de Ker Lann, 35172Bruz, France
| | - C. Peyronnet
- Terres Univia, 11 rue Monceau, 75008Paris, France
| | - A. Quinsac
- Terres Inovia, 11 rue Monge, Parc industriel, 33600Pessac, France
| | - N. Même
- INRAE, Université de Tours, UMR BOA, 37380Nouzilly, France
| | - A. Narcy
- INRAE, Université de Tours, UMR BOA, 37380Nouzilly, France
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Bournazel M, Lessire M, Klein S, Même N, Peyronnet C, Quinsac A, Duclos MJ, Narcy A. Phytase supplementation in diets rich in fiber from rapeseed enhances phosphorus and calcium digestibility but not retention in broiler chickens. Poult Sci 2018; 97:1627-1640. [PMID: 29506047 PMCID: PMC5890604 DOI: 10.3382/ps/pex446] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Indexed: 12/14/2022] Open
Abstract
Two experiments were conducted on broilers to assess the effect of dietary fiber from 00-rapeseed meal (RSM) on phosphorus (P) and calcium (Ca) apparent ileal digestibility (AID) and retention (AR) during the growing (Exp1: 10 to 21 d) or finishing period (Exp2: 21 to 31 d) in diets supplemented or not with microbial phytase. Each experiment involved 144 male Cobb 500 fed one of 8 diets. Fiber content was modulated by incorporating whole RSM, RSM from dehulled rapeseeds, either raw or supplemented with 2 levels of defatted rapeseed hulls. Diets were supplemented or not with 750 phytase units of microbial phytase per kg. Excreta were collected from d 14 to d 17 (Exp1) and from d 27 to d 30 (Exp2) to measure AR. At the end of experiments, digestive tracts were sampled and weighed. The distal ileum and tibias were collected to measure AID and bone mineralization, respectively. Age did not significantly alter the response of birds to the addition of dietary fiber. Inclusion of hulls decreased growth performance (P < 0.05). The weight of the proventriculus-gizzard (PG) increased with the dietary fiber content in Exp1: The decreased weight observed using dehulled RSM was reversed following the inclusion of hulls. In both trials, while the presence of phytase increased the AID of P (P < 0.001) but not Ca, the inclusion of hulls with phytase improved the AID of P and Ca [linear (Lin), P < 0.05]. This effect could depend on the effect of fiber on PG development and physiology. Hulls decreased the moisture content of excreta (P < 0.01), suggesting higher water retention or lower water consumption with fiber. The AR of P was lower than AID of P with hulls, contrary to Ca, suggesting a metabolic imbalance. The decrease of AR together with the decrease of bone characteristics indicates a lack of Ca in diets with hulls and suggests that P and Ca provision should be adapted to the level and the origin of fiber inclusion.
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Affiliation(s)
- M Bournazel
- BOA, INRA, Université de Tours, 37380 Nouzilly, France
- MiXscience, Centre d’affaires ODYSSEE, 35172 Bruz, France
| | - M Lessire
- BOA, INRA, Université de Tours, 37380 Nouzilly, France
| | - S Klein
- MiXscience, Centre d’affaires ODYSSEE, 35172 Bruz, France
| | - N Même
- BOA, INRA, Université de Tours, 37380 Nouzilly, France
| | - C Peyronnet
- Terres Univia, 11 rue Monceau, 75008 Paris, France
| | - A Quinsac
- Terres Inovia, 11 rue Monge, Parc industriel, 33600 Pessac, France
| | - M J Duclos
- BOA, INRA, Université de Tours, 37380 Nouzilly, France
| | - A Narcy
- BOA, INRA, Université de Tours, 37380 Nouzilly, France
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