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Casalta H, Bayrou C, Djebala S, Eppe J, Gille L, Gommeren K, Marduel E, Sartelet A, Seys C, Versyp J, Grulke S. Evaluation of Blood Lactate, Heart Rate, Blood Pressure, and Shock Index, and Their Association with Prognosis in Calves. Vet Sci 2024; 11:45. [PMID: 38275927 PMCID: PMC10819515 DOI: 10.3390/vetsci11010045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 12/26/2023] [Accepted: 01/18/2024] [Indexed: 01/27/2024] Open
Abstract
Diseases in young calves received as emergencies are often associated with hypovolemic and/or septic shocks. The objectives of our study were to (1) assess the correlation between clinical hemodynamic parameters and blood L-lactates (LAC), systolic blood pressure (SBP), and the shock index (SI) recorded upon arrival; and (2) to evaluate how these parameters were related to short-term outcomes in calves under 4 months of age presented as emergencies. We conducted a single-observer prospective observational study on calves aged from 1 day to 4 months, presented to the Veterinary Clinic for Ruminants of Liège from December 2020 to May 2022. Forty-five calves were included in the study. The statistical analysis revealed a significant correlation between LAC and heart rate (r = 0.570; p < 0.05) and LAC and SI (r = 0.373; p < 0.05). A high LAC value at admission was significantly associated with a negative outcome (death) (p < 0.05). In calves suffering from obstructive digestive diseases, the SI was related to the outcome and the analysis indicated a cut-off value of 1.13 (Se = 0.77, Spe = 1). In conclusion, in our study, the initial blood L-lactate value was correlated with heart rate, the shock index, and the clinical shock score, and admission hyperlactatemia was associated with a poor prognosis in calves under 4 months of age. In this cohort, the shock index in calves suffering from digestive diseases was linked with mortality.
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Affiliation(s)
- Hélène Casalta
- Clinical Department of Production Animals, Faculty of Veterinary Medicine, University of Liège, 4000 Liège, Belgium; (C.B.); (J.E.); (A.S.); (C.S.); (J.V.)
| | - Calixte Bayrou
- Clinical Department of Production Animals, Faculty of Veterinary Medicine, University of Liège, 4000 Liège, Belgium; (C.B.); (J.E.); (A.S.); (C.S.); (J.V.)
| | - Salem Djebala
- Independent Researcher, Muckerstaff Granard, N39AN52 Co Longford, Ireland;
| | - Justine Eppe
- Clinical Department of Production Animals, Faculty of Veterinary Medicine, University of Liège, 4000 Liège, Belgium; (C.B.); (J.E.); (A.S.); (C.S.); (J.V.)
| | - Linde Gille
- Independent Researcher, 1170 Watermael-Boitsfort, Belgium
| | - Kris Gommeren
- Clinical Department of Companions Animals, Faculty of Veterinary Medicine, University of Liège, 4000 Liège, Belgium;
| | - Eva Marduel
- Independent Researcher, 44200 Nantes, France;
| | - Arnaud Sartelet
- Clinical Department of Production Animals, Faculty of Veterinary Medicine, University of Liège, 4000 Liège, Belgium; (C.B.); (J.E.); (A.S.); (C.S.); (J.V.)
| | - Celine Seys
- Clinical Department of Production Animals, Faculty of Veterinary Medicine, University of Liège, 4000 Liège, Belgium; (C.B.); (J.E.); (A.S.); (C.S.); (J.V.)
| | - Jérôme Versyp
- Clinical Department of Production Animals, Faculty of Veterinary Medicine, University of Liège, 4000 Liège, Belgium; (C.B.); (J.E.); (A.S.); (C.S.); (J.V.)
| | - Sigrid Grulke
- Clinical Department of Equines, Faculty of Veterinary Medicine, University of Liège, 4000 Liège, Belgium;
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Eppe J, Bayrou C, Casalta H, Cassart D, Gille L, Stipulanti M, Versyp J, Sartelet A. Oak Acorn Poisoning in Cattle during Autumn 2022: A Case Series and Review of the Current Knowledge. Animals (Basel) 2023; 13:2678. [PMID: 37627469 PMCID: PMC10451953 DOI: 10.3390/ani13162678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 08/10/2023] [Accepted: 08/19/2023] [Indexed: 08/27/2023] Open
Abstract
Oak poisoning is a known intoxication in grazing animals, but is slightly described in the literature. This case report describes 7 cattle from 3 different farms admitted to the clinic for ruminants of the University of Liège for suspected acorn poisoning in the autumn of 2022. The clinical signs were, anorexia, apathy with polyuria with low density. Further investigations led to the diagnosis of renal failure (blood urea 162 ± 88 mg/dL; blood creatinine 12 ± 4 mg/L). Supportive treatment, based on infusions (NaCl 0.9%) and electrolyte rebalancing, was administered and renal values were assessed every 24-48 h. Of these animals, 5/7 were euthanized. At necropsy, digestive erosions and ulcerations, oedema and renal hemorrhages, between the pyloric/caliceal cavity and the medulla were observed. Histopathological examination revealed necrosis of the renal tubules. The renal values of the two remaining animals were reduced, their general condition improved, and they were discharged. Acorn poisoning is a serious disease with no specific antidote or characteristic symptoms. Animals are identified as sick too late, when renal failure is already established. Farmers should be made more aware in order to prevent exposure, especially in years when acorns are abundant. Furthermore, there is no antidote for this intoxication.
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Affiliation(s)
- Justine Eppe
- Fundamental and Applied Research for Animals and Health Research Unit (FARAH), Clinical Department of Production Animals, Faculty of Veterinary Medicine, University of Liège, Quartier Vallée 2, Avenue de Cureghem 7A-7D, 4000 Liège, Belgium; (C.B.); (H.C.); (L.G.); (M.S.); (J.V.); (A.S.)
| | - Calixte Bayrou
- Fundamental and Applied Research for Animals and Health Research Unit (FARAH), Clinical Department of Production Animals, Faculty of Veterinary Medicine, University of Liège, Quartier Vallée 2, Avenue de Cureghem 7A-7D, 4000 Liège, Belgium; (C.B.); (H.C.); (L.G.); (M.S.); (J.V.); (A.S.)
| | - Hélène Casalta
- Fundamental and Applied Research for Animals and Health Research Unit (FARAH), Clinical Department of Production Animals, Faculty of Veterinary Medicine, University of Liège, Quartier Vallée 2, Avenue de Cureghem 7A-7D, 4000 Liège, Belgium; (C.B.); (H.C.); (L.G.); (M.S.); (J.V.); (A.S.)
| | - Dominique Cassart
- Fundamental and Applied Research for Animals and Health Research Unit (FARAH), Department of Animal Pathology, Faculty of Veterinary Medicine, University of Liège, Quartier Vallée 2, Avenue de Cureghem 6, 4000 Liège, Belgium;
| | - Linde Gille
- Fundamental and Applied Research for Animals and Health Research Unit (FARAH), Clinical Department of Production Animals, Faculty of Veterinary Medicine, University of Liège, Quartier Vallée 2, Avenue de Cureghem 7A-7D, 4000 Liège, Belgium; (C.B.); (H.C.); (L.G.); (M.S.); (J.V.); (A.S.)
| | - Margot Stipulanti
- Fundamental and Applied Research for Animals and Health Research Unit (FARAH), Clinical Department of Production Animals, Faculty of Veterinary Medicine, University of Liège, Quartier Vallée 2, Avenue de Cureghem 7A-7D, 4000 Liège, Belgium; (C.B.); (H.C.); (L.G.); (M.S.); (J.V.); (A.S.)
| | - Jérôme Versyp
- Fundamental and Applied Research for Animals and Health Research Unit (FARAH), Clinical Department of Production Animals, Faculty of Veterinary Medicine, University of Liège, Quartier Vallée 2, Avenue de Cureghem 7A-7D, 4000 Liège, Belgium; (C.B.); (H.C.); (L.G.); (M.S.); (J.V.); (A.S.)
| | - Arnaud Sartelet
- Fundamental and Applied Research for Animals and Health Research Unit (FARAH), Clinical Department of Production Animals, Faculty of Veterinary Medicine, University of Liège, Quartier Vallée 2, Avenue de Cureghem 7A-7D, 4000 Liège, Belgium; (C.B.); (H.C.); (L.G.); (M.S.); (J.V.); (A.S.)
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Gille L, Bayrou C, Casalta H, Djebala S, Eppe J, Sartelet A. An obstructive upper respiratory emergency in a pregnant Belgian blue heifer. VLAAMS DIERGEN TIJDS 2022. [DOI: 10.21825/vdt.84797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In this case report, the surgical intervention and aftercare are described of an upper airway obstruction in a two-and-a-half year old, seven-months pregnant Belgian blue heifer. The animal had been referred to the Clinic for Ruminants (University of Liège) for complaints of stridor and dyspnea and suffered from necrotic laryngitis, complicated by the formation of an obstructive granuloma. Emergency tracheotomy was performed to save the life of the cow and its calf. Through the use of a self-retaining cannula, the modified tracheotomy site could be kept patent until the calf was born and the pathology resolved two months after admission. Healing of the larynx was checked and documented by use of nasal and retro-tracheal endoscopy.
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Djebala S, Evrard J, Gregoire F, Bayrou C, Gille L, Eppe J, Casalta H, Frisée V, Moula N, Sartelet A, Thiry D, Bossaert P. Antimicrobial Susceptibility Profile of Several Bacteria Species Identified in the Peritoneal Exudate of Cows Affected by Parietal Fibrinous Peritonitis after Caesarean Section. Vet Sci 2021; 8:vetsci8120295. [PMID: 34941822 PMCID: PMC8707031 DOI: 10.3390/vetsci8120295] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Revised: 11/17/2021] [Accepted: 11/26/2021] [Indexed: 11/16/2022] Open
Abstract
The aim of this study was to identify the species and antimicrobial susceptibility of bacteria involved in parietal fibrinous peritonitis (PFP). We studied 156 peritoneal fluid samples from cows presenting PFP after caesarean section. Bacteria were cultured in selective media and their antimicrobial susceptibility was tested by disk diffusion assay. Bacteria were isolated in the majority (129/156; 83%) of samples. The majority (82/129; 63%) of positive samples contained one dominant species, while two or more species were cultured in 47/129 (36%) samples. Trueperella pyogenes (T. Pyogenes) (107 strains) was the most identified species, followed by Escherichia coli (E. coli) (38 strains), Proteus mirabilis (P. mirabilis) (6 strains), and Clostridium perfringens (C. perfringens) (6 strains). Several other species were sporadically identified. Antimicrobial susceptibility was tested in 59/185 strains, predominantly E. coli (38 strains) and P. mirabilis (6 strains). Antibiotic resistance, including resistance to molecules of critical importance, was commonly observed; strains were classified as weakly drug resistant (22/59; 37%), multidrug resistant (24/59; 41%), extensively drug resistant (12/59; 20%), or pan-drug resistant (1/59; 2%). In conclusion, extensive antibiotic resistance in the isolated germs might contribute to treatment failure. Ideally, antimicrobial therapy of PFP should be based upon bacterial culture and susceptibility testing.
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Affiliation(s)
- Salem Djebala
- Clinical Department of Production Animals, Faculty of Veterinary Medicine, University of Liège, Quartier Vallée 2, Avenue de Cureghem 7A-7D, 4000 Liège, Belgium; (C.B.); (L.G.); (J.E.); (H.C.); (V.F.); (A.S.); (P.B.)
- Correspondence: ; Tel.: +32-493-333-591
| | - Julien Evrard
- Gestion et Prévention de Santé, Regional Association of Health and Animal Identification, Allée des Artisans 2, 5590 Ciney, Belgium; (J.E.); (F.G.)
| | - Fabien Gregoire
- Gestion et Prévention de Santé, Regional Association of Health and Animal Identification, Allée des Artisans 2, 5590 Ciney, Belgium; (J.E.); (F.G.)
| | - Calixte Bayrou
- Clinical Department of Production Animals, Faculty of Veterinary Medicine, University of Liège, Quartier Vallée 2, Avenue de Cureghem 7A-7D, 4000 Liège, Belgium; (C.B.); (L.G.); (J.E.); (H.C.); (V.F.); (A.S.); (P.B.)
| | - Linde Gille
- Clinical Department of Production Animals, Faculty of Veterinary Medicine, University of Liège, Quartier Vallée 2, Avenue de Cureghem 7A-7D, 4000 Liège, Belgium; (C.B.); (L.G.); (J.E.); (H.C.); (V.F.); (A.S.); (P.B.)
| | - Justine Eppe
- Clinical Department of Production Animals, Faculty of Veterinary Medicine, University of Liège, Quartier Vallée 2, Avenue de Cureghem 7A-7D, 4000 Liège, Belgium; (C.B.); (L.G.); (J.E.); (H.C.); (V.F.); (A.S.); (P.B.)
| | - Hélène Casalta
- Clinical Department of Production Animals, Faculty of Veterinary Medicine, University of Liège, Quartier Vallée 2, Avenue de Cureghem 7A-7D, 4000 Liège, Belgium; (C.B.); (L.G.); (J.E.); (H.C.); (V.F.); (A.S.); (P.B.)
| | - Vincent Frisée
- Clinical Department of Production Animals, Faculty of Veterinary Medicine, University of Liège, Quartier Vallée 2, Avenue de Cureghem 7A-7D, 4000 Liège, Belgium; (C.B.); (L.G.); (J.E.); (H.C.); (V.F.); (A.S.); (P.B.)
| | - Nassim Moula
- Department of Veterinary Management of Animal Resources, Faculty of Veterinary Medicine, Fundamental and Applied Research for Animal & Health (FARAH), University of Liège, 4000 Liège, Belgium;
- GIGA—Animal Facilities—ULiège—B 34, 4000 Liège, Belgium
| | - Arnaud Sartelet
- Clinical Department of Production Animals, Faculty of Veterinary Medicine, University of Liège, Quartier Vallée 2, Avenue de Cureghem 7A-7D, 4000 Liège, Belgium; (C.B.); (L.G.); (J.E.); (H.C.); (V.F.); (A.S.); (P.B.)
| | - Damien Thiry
- Bacteriology, Department of Infectious and Parasitic Diseases, Faculty of Veterinary Medicine, University of Liège, Quartier Vallée 2, Avenue Cureghem 6, 4000 Liège, Belgium;
| | - Philippe Bossaert
- Clinical Department of Production Animals, Faculty of Veterinary Medicine, University of Liège, Quartier Vallée 2, Avenue de Cureghem 7A-7D, 4000 Liège, Belgium; (C.B.); (L.G.); (J.E.); (H.C.); (V.F.); (A.S.); (P.B.)
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Djebala S, Evrard J, Moula N, Gille L, Bayrou C, Eppe J, Casalta H, Sartelet A, Bossaert P. Comparison between generalised peritonitis and parietal fibrinous peritonitis in cows after caesarean section. Vet Rec 2020; 187:e49. [PMID: 32591365 DOI: 10.1136/vr.105867] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2020] [Revised: 05/16/2020] [Accepted: 06/07/2020] [Indexed: 11/03/2022]
Abstract
BACKGROUND Parietal fibrinous peritonitis (PFP) and generalised peritonitis (GP) are two postoperative complications in cows, characterised by fluid and fibrin accumulation throughout the peritoneum (GP) or in an encapsulated cavity (PFP). Unlike GP, PFP is scarcely documented. METHODS Twenty-one GP cases and 12 PFP cases were confirmed by ultrasound in cows referred to the Veterinary Clinic (Liège University) for complications after caesarean section. All cows underwent a standardised examination protocol. Blood samples were analysed for metabolic and inflammatory markers. Bacteriology was performed on peritoneal fluid samples. Treatment consisted of surgical drainage of the abdominal cavity (GP) or the encapsulated cavity (PFP). Variables concerning anamnesis, clinical findings and treatment outcomes were compared. RESULTS Perioperative complications had occurred in 9/21 GP cows but 0/12 PFP cows (P<0.05). Biochemical analysis indicated pronounced inflammation and did not differ between groups. Peritoneal fluid samples of both groups were contaminated and contained similar bacteria (Trueperella pyogenes and Escherichia coli). While 11/12 PFP cows were discharged, all patients with GP died or were euthanased (P<0.05). CONCLUSIONS We hypothesise that PFP and GP are two different manifestations of perioperative peritoneal contamination. The severity and spread of the contamination determine the clinical presentation and the prognosis.
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Affiliation(s)
- Salem Djebala
- Clinical Department of Ruminant, University of Liege, Liege, Belgium
| | - Julien Evrard
- Gestion et Prévention de Santé, Regional Association of Health and Animal Identification, Ciney, Belgium
| | - Nassim Moula
- Department of Animal Production, University of Liege, Liege, Belgium
| | - Linde Gille
- Clinical Department of Ruminant, University of Liege, Liege, Belgium
| | - Calixte Bayrou
- Clinical Department of Ruminant, University of Liege, Liege, Belgium
| | - Justine Eppe
- Clinical Department of Ruminant, University of Liege, Liege, Belgium
| | - Hélène Casalta
- Clinical Department of Ruminant, University of Liege, Liege, Belgium
| | - Arnaud Sartelet
- Clinical Department of Ruminant, University of Liege, Liege, Belgium
| | - Philippe Bossaert
- Clinical Department of Ruminant, University of Liege, Liege, Belgium
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Endress E, Heller H, Casalta H, Brown MF, Bayerl TM. Anisotropic motion and molecular dynamics of cholesterol, lanosterol, and ergosterol in lecithin bilayers studied by quasi-elastic neutron scattering. Biochemistry 2002; 41:13078-86. [PMID: 12390036 DOI: 10.1021/bi0201670] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Quasi-elastic neutron scattering (QENS) was employed to study the molecular dynamics of three structurally related sterols, namely, cholesterol, lanosterol, and ergosterol. Oriented bilayers of dipalmitoylphosphatidylcholine (DPPC) were investigated at 40 mol % sterol content and at three temperatures (20, 36, and 50 degrees C) for two energy resolutions. Data analysis was concentrated on a direct comparison of the out-of-plane and the in-plane high-frequency motions of the three sterols in terms of their rates and amplitudes. The (spatially restricted) diffusive motion of the three sterols in the two directions was characterized by diffusion constants in the range of (5-30) x 10(-12) x m(2) x s(-1), with a significantly faster rate of diffusion along the membrane normal, resulting in a diffusional anisotropy, D(a). At low temperature (20 degrees C), cholesterol showed the highest value (D(a) = 4.5), while lanosterol gave the lowest one (D(a) = 2.0). At high temperature (50 degrees C), ergosterol diffusion had the highest diffusion anisotropy (D(a) = 2.0) compared to lanosterol (D(a) = 1.8) and cholesterol (D(a) = 1.6). Most interestingly, cholesterol showed at all three temperatures an amplitude of its out-of-plane-motion of 1.0-1.1 nm, more than a factor of 3 higher than measured for the other two sterols. This finding suggests that the short alkyl chain of the cholesterol molecule may cross at high frequency the bilayer midplane, while the other two sterols remain confined within the geometrical limits of each monolayer leaflet. The results provide an example of how slight structural alterations of sterols can affect their molecular dynamics in bilayers, which in turn may be relevant to the membrane micromechanical properties.
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Affiliation(s)
- Emil Endress
- Physikalisches Institut EP5, Universität Würzburg, D-97074 Würzburg, Germany, Leibniz Rechenzentrum, München, Germany
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Abbati GL, Brunel LC, Casalta H, Cornia A, Fabretti AC, Gatteschi D, Hassan AK, Jansen AG, Maniero AL, Pardi L, Paulsen C, Segre U. Single-Ion versus Dipolar Origin of the Magnetic Anisotropy in Iron(III)-Oxo Clusters: A Case Study. Chemistry 2001; 7:1796-807. [PMID: 11349922 DOI: 10.1002/1521-3765(20010417)7:8<1796::aid-chem17960>3.0.co;2-y] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A multitechnique approach has allowed the first experimental determination of single-ion anisotropies in a large iron(III)-oxo cluster, namely [NaFe6(OCH3)12(pmdbm)6ClO4 (1) in which Hpmdbm = 1,3-bis(4-methoxyphenyl)-1,3-propanedione. High-frequency EPR (HF-EPR). bulk susceptibility measurements, and high-field cantilever torque magnetometry (HF-CTM) have been applied to iron-doped samples of an isomorphous hexagallium(III) cluster [NaGa6(OCH3)12-(pmdbm)6]ClO4, whose synthesis and X-ray structure are also presented. HF-EPR at 240 GHz and susceptibility data have shown that the iron(III) ions have a hard-axis type anisotropy with DFe = 0.43(1) cm(-1) and EFe = 0.066(3) cm(-1) in the zero-field splitting (ZFS) Hamiltonian H = DFe[S2(z) - S(S + 1)/3] + Fe[S2(x) - S2(y)]. HF-CTM at 0.4 K has then been used to establish the orientation of the ZFS tensors with respect to the unique molecular axis of the cluster, Z. The hard magnetic axes of the iron(III) ions are found to be almost perpendicular to Z, so that the anisotropic components projected onto Z are negative, DFe(ZZ)= -0.164(4) cm(-1). Due to the dominant antiferromagnetic coupling, a negative DFe(ZZ) value determines a hard-axis molecular anisotropy in 1, as experimentally observed. By adding point-dipolar interactions between iron(III) spins, the calculated ZFS parameter of the triplet state, D1 = 4.70(9) cm(-1), is in excellent agreement with that determined by inelastic neutron scattering experiments at 2 K, D1 = 4.57(2) cm(-1). Iron-doped samples of a structurally related compound, the dimer [Ga2(OCH3)2(dbm)4] (Hdbm = dibenzoylmethane), have also been investigated by HF-EPR at 525 GHz. The single-ion anisotropy is of the hard-axis type as well, but the DFe parameter is significantly larger [DFe = 0.770(3) cm(-1). EFe = 0.090(3) cm(-1)]. We conclude that, although the ZFS tensors depend very unpredictably on the coordination environment of the metal ions, single-ion terms can contribute significantly to the magnetic anisotropy of iron(III)-oxo clusters, which are currently investigated as single-molecule magnets.
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Affiliation(s)
- G L Abbati
- Dipartimento di Chimica Università degli Studi di Modena e Reggio Emilia, Italy
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Gliss C, Randel O, Casalta H, Sackmann E, Zorn R, Bayerl T. Anisotropic motion of cholesterol in oriented DPPC bilayers studied by quasielastic neutron scattering: the liquid-ordered phase. Biophys J 1999; 77:331-40. [PMID: 10388761 PMCID: PMC1300333 DOI: 10.1016/s0006-3495(99)76893-1] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Quasielastic neutron scattering (QENS) at two energy resolutions (1 and 14 microeV) was employed to study high-frequency cholesterol motion in the liquid ordered phase (lo-phase) of oriented multilayers of dipalmitoylphosphatidylcholine at three temperatures: T = 20 degrees C, T = 36 degrees C, and T = 50 degrees C. We studied two orientations of the bilayer stack with respect to the incident neutron beam. This and the two energy resolutions for each orientation allowed us to determine the cholesterol dynamics parallel to the normal of the membrane stack and in the plane of the membrane separately at two different time scales in the GHz range. We find a surprisingly high, model-independent motional anisotropy of cholesterol within the bilayer. The data analysis using explicit models of molecular motion suggests a superposition of two motions of cholesterol: an out-of-plane diffusion of the molecule parallel to the bilayer normal combined with a locally confined motion within the bilayer plane. The rather high amplitude of the out-of-plane diffusion observed at higher temperatures (T >/= 36 degrees C) strongly suggests that cholesterol can move between the opposite leaflets of the bilayer while it remains predominantly confined within its host monolayer at lower temperatures (T = 20 degrees C). The locally confined in-plane cholesterol motion is dominated by discrete, large-angle rotational jumps of the steroid body rather than a quasicontinous rotational diffusion by small angle jumps. We observe a significant increase of the rotational jump rate between T = 20 degrees C and T = 36 degrees C, whereas a further temperature increase to T = 50 degrees C leaves this rate essentially unchanged.
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Affiliation(s)
- C Gliss
- Institut für Experimentelle Physik, V, Universität Würzburg, 97074 Würzburg, Germany
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Poulsen HF, Schneider JR, Andersen NH, Schleger P, Madsen J, Hadfield R, Casalta H, Liang R, Dosanjh P, Hardy W. Structural phase transitions in bulk YBa2Cu3O6+x with x=0.35 and x=0.36. Phys Rev B Condens Matter 1996; 53:15335-15344. [PMID: 9983332 DOI: 10.1103/physrevb.53.15335] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Longmore A, Boothroyd AT, Changkang C, Yongle H, Nutley MP, Andersen NH, Casalta H, Schleger P, Christensen AN. Magnetic ordering in PrBa2Cu3-yAlyO6+x. Phys Rev B Condens Matter 1996; 53:9382-9395. [PMID: 9982442 DOI: 10.1103/physrevb.53.9382] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Brecht E, Schmahl WW, Fuess H, Casalta H, Schleger P, Lebech B, Andersen NH, Wolf T. Significance of Al doping for antiferromagnetic AFII ordering in YBa2Cu3-xAlxO6+ delta materials: A single-crystal neutron-diffraction study. Phys Rev B Condens Matter 1995; 52:9601-9610. [PMID: 9980009 DOI: 10.1103/physrevb.52.9601] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Schleger P, Hadfield RA, Casalta H, Andersen NH, Poulsen HF, Schneider JR, Liang R, Dosanjh P, Hardy WN. Random-field structural transition in YBa2Cu3O6.5? Phys Rev Lett 1995; 74:1446-1449. [PMID: 10059022 DOI: 10.1103/physrevlett.74.1446] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Casalta H, Schleger P, Brecht E, Montfrooij W, Andersen NH, Lebech B, Schmahl WW, Fuess H, Liang R, Hardy WN, Wolf T. Absence of a second antiferromagnetic transition in pure YBa2Cu3O6+x. Phys Rev B Condens Matter 1994; 50:9688-9691. [PMID: 9975044 DOI: 10.1103/physrevb.50.9688] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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15
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Schleger P, Hardy WN, Casalta H. Model for the high-temperature oxygen-ordering thermodynamics in YBa2Cu3O6+x: Inclusion of electron spin and charge degrees of freedom. Phys Rev B Condens Matter 1994; 49:514-523. [PMID: 10009312 DOI: 10.1103/physrevb.49.514] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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16
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Alloul H, Mahajan A, Casalta H, Klein O. 89Y NMR study of the anisotropy of the static and dynamic susceptibilities in YBa2Cu3O6+x. Phys Rev Lett 1993; 70:1171-1174. [PMID: 10054304 DOI: 10.1103/physrevlett.70.1171] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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17
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Alloul H, Mendels P, Casalta H, Marucco JF, Arabski J. Correlations between magnetic and superconducting properties of Zn-substituted YBa2Cu3O6+x. Phys Rev Lett 1991; 67:3140-3143. [PMID: 10044651 DOI: 10.1103/physrevlett.67.3140] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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