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Sallabanda M, Vera JA, Pérez JM, De Pablo A, Montero M, Garrido MI, Matute R, Miralbell R, Cerron F, Castro J, Mazal A. Five-Fraction Proton Therapy for Chordomas and Chondrosarcomas of the Skull Base: Preliminary Results of a Prospective Series. Int J Radiat Oncol Biol Phys 2023; 117:e337. [PMID: 37785181 DOI: 10.1016/j.ijrobp.2023.06.2394] [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] [Indexed: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) To describe the first series of patients with clival chordomas and chondrosarcomas treated with extremely hypofractionated proton therapy in a single institution with focus on acute tolerance and dosimetric parameters. MATERIALS/METHODS A total of 11 consecutive patients with biopsy proven chordomas and chondrosarcomas were prospectively included in a five-fraction proton therapy protocol between June 2022 and January 2023. The inclusion criteria for this protocol were: Age > 18 yo., Karnofsky Performance Status (KPS) ≥ 70%, absence of metastases, no previous radiation courses, clinical target volume (CTV) up to 50 cc and CTV location relative to organs at risk that allowed compliance with the necessary dose restrictions for hypofractionated treatments in 5 fractions, according to the international guidelines. Treatment was delivered with a Proteus®ONE cyclotron using Pencil Beam Scanning (PBS) Intensity-Modulated Proton Therapy (IMPT). Patient setup was performed with CBCT imaging at isocenter and X-Ray obliques, allowing a robust planning with 1 mm setup uncertainty and 3.5% range uncertainty. IMPT plans were obtained with RayStation employing 4 to 6 non-coplanar beams. In 7 patients' apertures were used in 2 of the beams, to reduce lateral penumbra and to optimize dose gradient. RESULTS A total of 11 patients (7 males and 5 females) with an age range between 29 and 79 yo, were included. 6 patients with classic chordomas and 5 patients with grade I-II chondrosarcomas were treated with a total dose of 37.5 GyRBE and 35 GyRBE, respectively, in 5 daily fractions. All the patients had received previous surgery with complete resection in 2 patients, subtotal resection in 7 patients and partial resection in 2 patients. Most common symptoms at diagnosis were diplopia and headache and baseline median KPS after surgery was 90% (70 - 100%). Median CTV was 30.62 cc (10.56 - 47.47 cc). Median CTV coverage was V95% = D95.5%. Median maximal dose for the brainstem was 26.5 GyRBE (30 - 24.7 GyRBE) and for the optic pathway was 20.7 GyRBE (8.9 - 23.6 GyRBE). Median follow-up was 3 months (8 - 1 months). Acute toxicity during follow-up was mild, with grade I - II headache (64%), grade I asthenia (45%), grade I nausea (27%), grade I dysphagia (18%) and reversible alopecia (45%). Only one patient showed nystagmus and mild loss of strength in left lower limb related with an ischemic brainstem lesion, in a low dose region, not clearly radiation related. 8 patients had a 3-month follow-up MRI with no signs of progression. CONCLUSION Five-fraction proton therapy for the treatment of clival chordomas and chondrosarcomas is dosimetrically feasible and well tolerated for selected patients. Proton therapy remains a limited resource, consequently, reducing treatment time can have significant financial and psychosocial implications. Longer follow up is needed to validate these results.
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Affiliation(s)
- M Sallabanda
- Centro de Protonterapia Quironsalud, Madrid, Spain
| | - J A Vera
- Centro de Protonterapia Quironsalud, Madrid, Spain
| | - J M Pérez
- Centro de Protonterapia Quironsalud, Madrid, Spain
| | - A De Pablo
- Centro de Protonterapia Quironsalud, Madrid, Spain
| | - M Montero
- Centro de Protonterapia Quironsalud, Madrid, Spain
| | - M I Garrido
- Centro de Protonterapia Quironsalud, Madrid, Spain
| | - R Matute
- Centro de Protonterapia Quironsalud, Madrid, Spain
| | - R Miralbell
- Centro de Protonterapia Quironsalud, Madrid, Spain
| | - F Cerron
- Centro de Protonterapia Quironsalud, Madrid, Spain
| | - J Castro
- Centro de Protonterapia Quironsalud, Madrid, Spain
| | - A Mazal
- Centro de Protonterapia Quironsalud, Madrid, Spain
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2
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Castro JM, Montalbán MG, Martínez-Pérez N, Domene-López D, Pérez JM, Arrabal-Campos FM, Fernández I, Martín-Gullón I, García-Quesada JC. Thermoplastic starch/polyvinyl alcohol blends modification by citric acid-glycerol polyesters. Int J Biol Macromol 2023:125478. [PMID: 37336376 DOI: 10.1016/j.ijbiomac.2023.125478] [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: 04/26/2023] [Revised: 06/13/2023] [Accepted: 06/16/2023] [Indexed: 06/21/2023]
Abstract
Thermoplastic starch/polyvinyl alcohol (TPS/PVA) films have limitations for being used in long-term applications due to starch retrogradation. This leads to plasticizer migration, especially when low molecular weight plasticizers such as glycerol, are used. In this work, we employed mixtures of oligomers based on glycerol citrates with higher molecular weight than glycerol as plasticizers for potato-based TPS/PVA blends obtained by melt-mixing. This constitutes an alternative to reduce plasticizer migration while keeping high swelling degree, and to provide high mechanical performance. The novelty lies in the usage of these oligomers by melt-mixing technique, aspect not deeply explored previously and that represents the first step towards industrial scalability. Prior to the blending process, oligomers mixtures were prepared with different molar ratios of citric acid (0-40 mol%) and added them. This minimizes the undesirable hydrolysis effect of free carboxylic groups on starch chains. The results demonstrated that the migration of plasticizers in TPS/PVA blends decreased by up to 70 % when the citric acid content increased. This reduction was attributed to the higher molecular weight (the majority in the range 764-2060 Da) and the 3D structure of the oligomers compared to using raw glycerol. Furthermore, the films exhibited a 150 % increase in Young's modulus and tensile strength without a reduction in elongation at break, while maintaining a high gel content, due to a moderate crosslinking.
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Affiliation(s)
- Jennifer M Castro
- Chemical Engineering Department, University of Alicante, Apartado 99, 03080 Alicante, Spain; Institute of Chemical Process Engineering, University of Alicante, Apartado 99, 03080 Alicante, Spain
| | - Mercedes G Montalbán
- Chemical Engineering Department, Faculty of Chemistry, Regional Campus of International Excellence "Campus Mare Nostrum", University of Murcia, 30071 Murcia, Spain
| | - Noelia Martínez-Pérez
- Chemical Engineering Department, University of Alicante, Apartado 99, 03080 Alicante, Spain; Institute of Chemical Process Engineering, University of Alicante, Apartado 99, 03080 Alicante, Spain
| | - Daniel Domene-López
- Chemical Engineering Department, University of Alicante, Apartado 99, 03080 Alicante, Spain; Institute of Chemical Process Engineering, University of Alicante, Apartado 99, 03080 Alicante, Spain
| | - Juana M Pérez
- Department of Chemistry and Physics, CIAIMBITAL Center, University of Almeria, 04120 Almeria, Spain
| | | | - Ignacio Fernández
- Department of Chemistry and Physics, CIAIMBITAL Center, University of Almeria, 04120 Almeria, Spain
| | - Ignacio Martín-Gullón
- Chemical Engineering Department, University of Alicante, Apartado 99, 03080 Alicante, Spain; Institute of Chemical Process Engineering, University of Alicante, Apartado 99, 03080 Alicante, Spain.
| | - Juan C García-Quesada
- Chemical Engineering Department, University of Alicante, Apartado 99, 03080 Alicante, Spain; Institute of Chemical Process Engineering, University of Alicante, Apartado 99, 03080 Alicante, Spain
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Postolache R, Pérez JM, Castiñeira Reis M, Ge L, Sinnema EG, Harutyunyan SR. Manganese(I)-Catalyzed Asymmetric Hydrophosphination of α,β-Unsaturated Carbonyl Derivatives. Org Lett 2023; 25:1611-1615. [PMID: 36892214 PMCID: PMC10028696 DOI: 10.1021/acs.orglett.2c04256] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/10/2023]
Abstract
Here we report catalytic asymmetric hydrophosphination of α,β-unsaturated carbonyl derivatives using a chiral Mn(I) complex as a catalyst. Through H-P bond activation, various phosphine-containing chiral products can be accessed via hydrophosphination of various ketone-, ester-, and carboxamide-based Michael acceptors.
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Affiliation(s)
- Roxana Postolache
- Stratingh Institute for Chemistry, University of Groningen, 9747 AG Groningen, The Netherlands
| | - Juana M Pérez
- Stratingh Institute for Chemistry, University of Groningen, 9747 AG Groningen, The Netherlands
| | - Marta Castiñeira Reis
- Stratingh Institute for Chemistry, University of Groningen, 9747 AG Groningen, The Netherlands
| | - Luo Ge
- Stratingh Institute for Chemistry, University of Groningen, 9747 AG Groningen, The Netherlands
| | - Esther G Sinnema
- Stratingh Institute for Chemistry, University of Groningen, 9747 AG Groningen, The Netherlands
| | - Syuzanna R Harutyunyan
- Stratingh Institute for Chemistry, University of Groningen, 9747 AG Groningen, The Netherlands
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4
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Ge L, Sinnema EG, Pérez JM, Postolache R, Castiñeira Reis M, Harutyunyan SR. Enantio- and Z-selective synthesis of functionalized alkenes bearing tertiary allylic stereogenic center. Sci Adv 2023; 9:eadf8742. [PMID: 36638168 PMCID: PMC9839328 DOI: 10.1126/sciadv.adf8742] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Accepted: 12/12/2022] [Indexed: 06/17/2023]
Abstract
Olefins are ubiquitous in biologically active molecules and frequently used as building blocks in chemical transformations. However, although many strategies exist for the synthesis of stereodefined E-olefines, their thermodynamically less stable Z counterparts are substantially more demanding, while access to those bearing an allylic stereocenter with an adjacent reactive functionality remains unsolved altogether. Even the classic Wittig reaction, arguably the most versatile and widely used approach to construct Z-alkenes, falls short for the synthesis of these particularly challenging yet highly useful structural motives. Here, we report a general methodology for Z-selective synthesis of functionalized chiral alkenes that establishes readily available alkene-derived phosphines as an alternative to alkylating reagents in Wittig olefination, thus offering previously unidentified retrosynthetic disconnections for the formation of functionalized disubstituted alkenes. We demonstrate the potential of this method by structural diversification of several bioactive molecules.
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5
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Ruiz Martínez C, Pérez JM, Arrabal-Campos FM, Rodríguez-Diéguez A, Choquesillo-Lazarte D, Martínez-Lao JA, Ortuño MA, Fernández I. Lithium anthraquinoids as catalysts in the ROP of lactide and caprolactone into cyclic polymers. Polym Chem 2023. [DOI: 10.1039/d2py01076c] [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] [Indexed: 01/05/2023]
Abstract
New lithium anthraquinoids 2b–d active in the synthesis of cyclic PLA and cyclic PCL have been synthesized and fully characterized.
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Affiliation(s)
- Cristina Ruiz Martínez
- Department of Chemistry and Physics, Research Centre CIAIMBITAL, University of Almería, Ctra, Sacramento s/n, 04120 Almería, Spain
| | - Juana M. Pérez
- Department of Chemistry and Physics, Research Centre CIAIMBITAL, University of Almería, Ctra, Sacramento s/n, 04120 Almería, Spain
| | - Francisco M. Arrabal-Campos
- Department of Chemistry and Physics, Research Centre CIAIMBITAL, University of Almería, Ctra, Sacramento s/n, 04120 Almería, Spain
| | - Antonio Rodríguez-Diéguez
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, Av. Fuentenueva s/n, 18071 Granada, Spain
| | - Duane Choquesillo-Lazarte
- Laboratorio de Estudios Cristalográficos IACT, CSIC-UGR, Av. Las Palmeras no. 4, 18100 Granada, Spain
| | - Juan A. Martínez-Lao
- Department of Chemistry and Physics, Research Centre CIAIMBITAL, University of Almería, Ctra, Sacramento s/n, 04120 Almería, Spain
| | - Manuel A. Ortuño
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS), Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Ignacio Fernández
- Department of Chemistry and Physics, Research Centre CIAIMBITAL, University of Almería, Ctra, Sacramento s/n, 04120 Almería, Spain
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6
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Pérez JM, Echenique‐Errandonea E, Rojas S, Choquesillo‐Lazarte D, Seco JM, López‐Vargas ME, Rodríguez‐Diéguez A, Fernández I. Improved Performance of a Europium‐based Metal‐Organic Framework for Cyanosilylation of Demanding Ketones. ChemCatChem 2022. [DOI: 10.1002/cctc.202200967] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Juana M. Pérez
- Department of Chemistry and Physics Research Centre CIAIMBITAL University of Almería Ctra. Sacramento, s/n 04120 Almería Spain
| | - Estitxu Echenique‐Errandonea
- Departamento de Química Aplicada Facultad de Química Universidad del País Vasco UP/EHU Paseo Manuel Lardizabal N°3 20018 Donostia-San Sebastián Spain
| | - Sara Rojas
- Departamento de Química Inorgánica Facultad de Ciencias Universidad de Granada Av. Fuentenueva S/N 18071 Granada Spain
| | | | - José M. Seco
- Departamento de Química Aplicada Facultad de Química Universidad del País Vasco UP/EHU Paseo Manuel Lardizabal N°3 20018 Donostia-San Sebastián Spain
| | - Mireya E. López‐Vargas
- Department of Chemistry and Physics Research Centre CIAIMBITAL University of Almería Ctra. Sacramento, s/n 04120 Almería Spain
| | - Antonio Rodríguez‐Diéguez
- Departamento de Química Inorgánica Facultad de Ciencias Universidad de Granada Av. Fuentenueva S/N 18071 Granada Spain
| | - Ignacio Fernández
- Department of Chemistry and Physics Research Centre CIAIMBITAL University of Almería Ctra. Sacramento, s/n 04120 Almería Spain
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7
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Rodríguez-Pastor I, López-Pérez A, Romero-Sánchez MD, Pérez JM, Fernández I, Martin-Gullon I. Effective Method for a Graphene Oxide with Impressive Selectivity in Carboxyl Groups. Nanomaterials (Basel) 2022; 12:3112. [PMID: 36144900 PMCID: PMC9500783 DOI: 10.3390/nano12183112] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 09/05/2022] [Accepted: 09/06/2022] [Indexed: 06/16/2023]
Abstract
The development of new applications of graphene oxide in the biomedical field requires the covalent bonding of bioactive molecules to a sheet skeleton. Obtaining a large carboxyl group population over the surface is one of the main targets, as carboxyl group concentration in conventional graphene oxide is low among a majority of non-useful sp3-C-based functionalities. In the present work, we propose a selective method that yields an impressive increase in carboxyl group population using single-layer, thermally reduced graphene oxide as a precursor in a conventional Hummers-Offemann reaction. When starting with a reduced graphene oxide with no interlayer registry, sulfuric acid cannot form a graphite intercalated compound. Then, potassium permanganate attacks in in-plane (vacancies or holes) structural defects, which are numerous over a thermally reduced graphene oxide, as well as in edges, yielding majorly carboxyl groups without sheet cutting and unzipping, as no carbon dot formation was observed. A single-layer precursor with no ordered stacking prevents the formation of an intercalated compound, and it is this mechanism of the potassium permanganate that results in carboxyl group formation and the hydrophilic character of the compound.
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Affiliation(s)
- Iluminada Rodríguez-Pastor
- Applynano Solutions S.L., Alicante Scientific Park #3, 03690 Alicante, Spain
- Institute of Chemical Processes Engineering, University of Alicante, 03080 Alicante, Spain
| | - Adelia López-Pérez
- Applynano Solutions S.L., Alicante Scientific Park #3, 03690 Alicante, Spain
| | | | - Juana M. Pérez
- Research Centre CIAIMBITAL, University of Almería, 04120 Almería, Spain
| | - Ignacio Fernández
- Research Centre CIAIMBITAL, University of Almería, 04120 Almería, Spain
| | - Ignacio Martin-Gullon
- Institute of Chemical Processes Engineering, University of Alicante, 03080 Alicante, Spain
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8
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Pérez JM, Rojas S, García-García A, Montes-Andrés H, Ruiz Martínez C, Romero-Cano MS, Choquesillo-Lazarte D, Abdelkader-Fernández VK, Pérez-Mendoza M, Cepeda J, Rodríguez-Diéguez A, Fernández I. Catalytic Performance and Electrophoretic Behavior of an Yttrium-Organic Framework Based on a Tricarboxylic Asymmetric Alkyne. Inorg Chem 2022; 61:1377-1384. [PMID: 35015526 DOI: 10.1021/acs.inorgchem.1c02864] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A new Y-based metal-organic framework (MOF) GR-MOF-6 with a chemical formula of {[YL(DMF)2]·(DMF)}n {H3L = 5-[(4-carboxyphenyl)ethynyl] isophthalic acid; DMF = N,N-dimethylformamide} has been prepared by a solvothermal route. Structural characterization reveals that this novel material is a three-dimensional MOF in which the coordination of the tritopic ligand to Y(III) metal ions leads to an intercrossing channel system extending over three dimensions. This material has proven to be a very efficient catalyst in the cyanosilylation of carbonyls, ranking second in catalytic activity among the reported rare earth metal-based MOFs described so far but with the lowest required catalyst loading. In addition, its electrophoretic behavior has been studied in depth, providing a zero-charge point between pH 4 and 5, a peak electrophoretic mobility of -1.553 μm cm V-1 s-1, and a ζ potential of -19.8 mV at pH 10.
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Affiliation(s)
| | - Sara Rojas
- Department of Inorganic Chemistry, University of Granada, Av. Fuentenueva s/n, 18071 Granada, Spain
| | - Amalia García-García
- Department of Inorganic Chemistry, University of Granada, Av. Fuentenueva s/n, 18071 Granada, Spain
| | - Helena Montes-Andrés
- Department of Inorganic Chemistry, University of Granada, Av. Fuentenueva s/n, 18071 Granada, Spain
| | | | | | - Duane Choquesillo-Lazarte
- Laboratorio de Estudios Cristalográficos, IACT, CSIC-Universidad de Granada, Avda. de las Palmeras 4, 18100 Armilla, Granada, Spain
| | | | - Manuel Pérez-Mendoza
- Department of Inorganic Chemistry, University of Granada, Av. Fuentenueva s/n, 18071 Granada, Spain
| | - Javier Cepeda
- Departamento de Química Aplicada, Universidad del País Vasco (UPV/EHU), Paseo Manuel Lardizabal, 3, 20018 Donostia-San Sebastián, Spain
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Pérez JM, Postolache R, Castiñeira Reis M, Sinnema EG, Vargová D, de Vries F, Otten E, Ge L, Harutyunyan SR. Manganese(I)-Catalyzed H-P Bond Activation via Metal-Ligand Cooperation. J Am Chem Soc 2021; 143:20071-20076. [PMID: 34797634 PMCID: PMC8662621 DOI: 10.1021/jacs.1c10756] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
Here we report that
chiral Mn(I) complexes are capable of H–P
bond activation. This activation mode enables a general method for
the hydrophosphination of internal and terminal α,β-unsaturated
nitriles. Metal−ligand cooperation, a strategy previously not
considered for catalytic H–P bond activation, is at the base
of the mechanistic action of the Mn(I)-based catalyst. Our computational
studies support a stepwise mechanism for the hydrophosphination and
provide insight into the origin of the enantioselectivity.
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Affiliation(s)
- Juana M Pérez
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Roxana Postolache
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Marta Castiñeira Reis
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Esther G Sinnema
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Denisa Vargová
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Folkert de Vries
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Edwin Otten
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Luo Ge
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Syuzanna R Harutyunyan
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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10
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Echenique-Errandonea E, Pérez JM, Rojas S, Cepeda J, Seco JM, Fernández I, Rodríguez-Diéguez A. A novel yttrium-based metal-organic framework for the efficient solvent-free catalytic synthesis of cyanohydrin silyl ethers. Dalton Trans 2021; 50:11720-11724. [PMID: 34612309 DOI: 10.1039/d1dt01953h] [Citation(s) in RCA: 7] [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: 11/21/2022]
Abstract
A new porous metal-organic framework (MOF) with the chemical formula [Y5L6(OH)3(DMF)3]·5H2O (1) (where L = 3-amino-4-hydroxybenzoate) has been prepared by a solvothermal procedure. The structural characterization reveals that this material consists of a robust three-dimensional metal-organic framework (MOF) grown with clusters formed by Y(iii) and hydroxide anions joined to one another by the ligand, giving rise to an open structure with interconnected microchannels with variable dimensions. This assembled set has shown to possess a fascinating catalytic activity for the cyanosilylation of a broad range of aldehydes and ketones with exceptional recyclability, a solvent-free medium, and one order of magnitude lower catalyst loading compared to all related lanthanide-based MOFs described so far in the literature.
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Affiliation(s)
- Estitxu Echenique-Errandonea
- Departamento de Química Aplicada, Universidad del País Vasco UPV/EHU, Paseo Manuel Lardizabal, No. 3, 20018, Donostia-San Sebastián, Spain
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11
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Martínez CR, Pérez JM, Arrabal-Campos FM, Batuecas M, Ortuño MA, Fernández I. Cyclic polylactide synthesis initiated by a lithium anthraquinoid: understanding the selectivity through DFT and diffusion NMR. Polym Chem 2021. [DOI: 10.1039/d1py00547b] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present herein the application of a lithium anthraquinoid in the catalytic synthesis of cyclic PLA, showing that the aggregation plays a critical role in cyclic vs. linear selectivity.
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Affiliation(s)
- Cristina Ruiz Martínez
- Department of Chemistry and Physics
- Research Centre CIAIMBITAL
- University of Almería
- 04120
- Spain
| | - Juana M. Pérez
- Department of Chemistry and Physics
- Research Centre CIAIMBITAL
- University of Almería
- 04120
- Spain
| | | | - María Batuecas
- Department of Chemistry and Physics
- Research Centre CIAIMBITAL
- University of Almería
- 04120
- Spain
| | - Manuel A. Ortuño
- Institute of Chemical Research of Catalonia (ICIQ)
- The Barcelona Institute of Science and Technology (BIST)
- 43007 Tarragona
- Spain
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS)
| | - Ignacio Fernández
- Department of Chemistry and Physics
- Research Centre CIAIMBITAL
- University of Almería
- 04120
- Spain
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12
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Kulish K, Boldrini C, Castiñeira Reis M, Pérez JM, Harutyunyan SR. Lewis Acid Promoted Dearomatization of Naphthols. Chemistry 2020; 26:15843-15846. [PMID: 32960476 PMCID: PMC7894535 DOI: 10.1002/chem.202003392] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 09/09/2020] [Indexed: 01/08/2023]
Abstract
Two-step dearomative functionalization of naphthols promoted by Lewis acids and copper(I) catalysis was developed. Initially, Lewis acid complexation inverted the electronic properties of the ring and established an equilibrium with the dearomatized counterpart. Subsequent trapping of the dearomatized intermediate with organometallics as well as organophosphines was demonstrated and provided the corresponding dearomatized products.
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Affiliation(s)
- Kirill Kulish
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| | - Cosimo Boldrini
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| | - Marta Castiñeira Reis
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| | - Juana M Pérez
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| | - Syuzanna R Harutyunyan
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
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Vargová D, Pérez JM, Harutyunyan SR, Šebesta R. Trapping of chiral enolates generated by Lewis acid promoted conjugate addition of Grignard reagents to unreactive Michael acceptors by various electrophiles. Chem Commun (Camb) 2019; 55:11766-11769. [PMID: 31513177 DOI: 10.1039/c9cc05041h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Here we show trapping of chiral enolates with carbenium ions, Michael acceptors, and bromine. Silyl ketene aminals, disilyl acetals, and aza-enolates were obtained via Lewis acid mediated enantioselective conjugate addition of Grignard reagents to unsaturated amides, carboxylic acids and alkenyl heterocycles.
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Affiliation(s)
- Denisa Vargová
- Comenius University in Bratislava, Faculty of Natural Sciences, Department of Organic Chemistry, Mlynska dolina, Ilkovičova 6, 84215 Bratislava, Slovakia. and Stratingh Institute for Chemistry, Rijksuniversiteit Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| | - Juana M Pérez
- Stratingh Institute for Chemistry, Rijksuniversiteit Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| | - Syuzanna R Harutyunyan
- Stratingh Institute for Chemistry, Rijksuniversiteit Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| | - Radovan Šebesta
- Comenius University in Bratislava, Faculty of Natural Sciences, Department of Organic Chemistry, Mlynska dolina, Ilkovičova 6, 84215 Bratislava, Slovakia.
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14
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Collados JF, Ortiz P, Pérez JM, Xia Y, Koenis MAJ, Buma WJ, Nicu VP, Harutyunyan SR. Enantiospecific Brook Rearrangement of Tertiary Benzylic α-Hydroxysilanes. European J Org Chem 2018. [DOI: 10.1002/ejoc.201701469] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Juan F. Collados
- Stratingh Institute for Chemistry; University of Groningen; Nijenborgh 4 9747 AG Groningen The Netherlands
| | - Pablo Ortiz
- Stratingh Institute for Chemistry; University of Groningen; Nijenborgh 4 9747 AG Groningen The Netherlands
| | - Juana M. Pérez
- Stratingh Institute for Chemistry; University of Groningen; Nijenborgh 4 9747 AG Groningen The Netherlands
| | - Yiyin Xia
- Van′t Hoff Institute for Molecular Sciences; University of Amsterdam; Science Park 904 1090 GD Amsterdam The Netherlands
| | - Mark A. J. Koenis
- Van′t Hoff Institute for Molecular Sciences; University of Amsterdam; Science Park 904 1090 GD Amsterdam The Netherlands
| | - Wybren J. Buma
- Van′t Hoff Institute for Molecular Sciences; University of Amsterdam; Science Park 904 1090 GD Amsterdam The Netherlands
| | - Valentin P. Nicu
- Van′t Hoff Institute for Molecular Sciences; University of Amsterdam; Science Park 904 1090 GD Amsterdam The Netherlands
- Faculty of Agricultural Sciences, Food Industry and Environmental Protection; Lucian Blaga University of Sibiu; Ioan Ratiu Street 550012 Sibiu Romania
| | - Syuzanna R. Harutyunyan
- Stratingh Institute for Chemistry; University of Groningen; Nijenborgh 4 9747 AG Groningen The Netherlands
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Pérez JM, Maquilón C, Ramón DJ, Baeza A. Hexafluoroisopropanol-Promoted Metal-Free Allylation of Silyl Enol Ethers with Allylic Alcohols. ASIAN J ORG CHEM 2017. [DOI: 10.1002/ajoc.201700320] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Juana M. Pérez
- Institute of Organic Synthesis; University of Alicante; Ctra. San Vicente s/n Alicante 03080 Spain
| | - Cristina Maquilón
- Institute of Organic Synthesis; University of Alicante; Ctra. San Vicente s/n Alicante 03080 Spain
| | - Diego J. Ramón
- Institute of Organic Synthesis; University of Alicante; Ctra. San Vicente s/n Alicante 03080 Spain
| | - Alejandro Baeza
- Institute of Organic Synthesis; University of Alicante; Ctra. San Vicente s/n Alicante 03080 Spain
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16
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Pérez JM, Ramón DJ. Impregnated Copper(II) Oxide on Magnetite as Catalyst for the Synthesis of Benzo[b
]furans from 2-Hydroxyarylcarbonyl Derivatives and Alkynes. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600671] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Juana M. Pérez
- Instituto de Síntesis Orgánica (ISO); and Departamento de Química Orgánica; Facultad de Ciencias; Universidad de Alicante; Apdo. 99 03080 Alicante Spain
| | - Diego J. Ramón
- Instituto de Síntesis Orgánica (ISO); and Departamento de Química Orgánica; Facultad de Ciencias; Universidad de Alicante; Apdo. 99 03080 Alicante Spain
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17
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Pérez JM, Crosbie P, Lal S, Díez-González S. Copper(I)-Phosphinite Complexes in Click Cycloadditions: Three-Component Reactions and Preparation of 5-Iodotriazoles. ChemCatChem 2016; 8:2222-2226. [PMID: 27840662 PMCID: PMC5089671 DOI: 10.1002/cctc.201600234] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2016] [Indexed: 11/07/2022]
Abstract
The remarkable activity displayed by copper(I)–phosphinite complexes of general formula [CuBr(L)] in two challenging cycloadditions is reported: a) the one‐pot azidonation/cycloaddition of boronic acids, NaN3, and terminal alkynes; b) the cycloaddition of azides and iodoalkynes. These air‐stable catalysts led to very good results in both cases and the expected triazoles could be isolated in pure form under ‘Click‐suitable’ conditions.
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Affiliation(s)
- Juana M Pérez
- Department of ChemistryImperial College LondonExhibition Road, South KensingtonLondonSW7 2AZUK; Universidad de Alicante (Spain)
| | - Peter Crosbie
- Department of Chemistry Imperial College London Exhibition Road, South Kensington London SW7 2AZ UK
| | - Steven Lal
- Department of Chemistry Imperial College London Exhibition Road, South Kensington London SW7 2AZ UK
| | - Silvia Díez-González
- Department of Chemistry Imperial College London Exhibition Road, South Kensington London SW7 2AZ UK
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18
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Lagares JI, Araque JEG, Méndez-Villafañe R, Arce P, Sansaloni F, Vela O, Díaz C, Campo X, Pérez JM. Neutron spectra around a tandem linear accelerator in the generation of (18)F with a bonner sphere spectrometer. Appl Radiat Isot 2016; 114:154-8. [PMID: 27235889 DOI: 10.1016/j.apradiso.2016.05.023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [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: 03/17/2016] [Revised: 05/06/2016] [Accepted: 05/17/2016] [Indexed: 11/29/2022]
Abstract
A Bonner sphere spectrometer was used to measure the neutron spectra produced at the collision of protons with an H2(18)O target at different angles. A unique H2(18)O target to produce (18)F was designed and placed in a Tandem linear particle accelerator which produces 8.5MeV protons. The neutron count rates measured with the Bonner spheres were unfolded with the MAXED code. With the GEANT4 Monte Carlo code the neutron spectrum induced in the (p, n) reaction was estimated, this spectrum was used as initial guess during unfolding. Although the cross section of the reaction (18)O(p,n)(18)F is well known, the neutron energy spectra is not correctly defined and it is necessary to verify the simulation with measurements. For this reason, the sensitivity of the unfolding method to the initial spectrum was analyzed applying small variation to the fast neutron peak.
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Affiliation(s)
- J I Lagares
- Medical Applications Unit, CIEMAT, Av. Complutense 40, E-28040 Madrid, Spain.
| | - J E Guerrero Araque
- Ionizing Radiations Laboratory, CIEMAT, Av. Complutense 40, E-28040 Madrid, Spain
| | - R Méndez-Villafañe
- Ionizing Radiations Laboratory, CIEMAT, Av. Complutense 40, E-28040 Madrid, Spain
| | - P Arce
- Medical Applications Unit, CIEMAT, Av. Complutense 40, E-28040 Madrid, Spain
| | - F Sansaloni
- Medical Applications Unit, CIEMAT, Av. Complutense 40, E-28040 Madrid, Spain
| | - O Vela
- Medical Applications Unit, CIEMAT, Av. Complutense 40, E-28040 Madrid, Spain
| | - C Díaz
- Astroparticle Physics Division, Basic Research Department, CIEMAT, Av. Complutense 40, E-28040 Madrid, Spain
| | - Xandra Campo
- Ionizing Radiations Laboratory, CIEMAT, Av. Complutense 40, E-28040 Madrid, Spain
| | - J M Pérez
- Technology Department, CIEMAT, Av. Complutense 40, E-28040 Madrid, Spain
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Serra V, Cruz C, Bruna A, Ibrahim YH, Vivancos A, Vivancos A, Nuciforo P, Bellet M, Gómez P, Pérez JM, Saura C, Vidal M, Serres X, Rueda OM, Peg V, Caldas C, O'Connor MJ, Baselga J, Cortés J. Abstract P4-07-04: PARP1/2 inhibition in a subset of triple negative breast cancer (TNBC) patient-derived tumor xenografts (PDX) identifies predictive biomarkers of response. Cancer Res 2016. [DOI: 10.1158/1538-7445.sabcs15-p4-07-04] [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] [Indexed: 11/16/2022]
Abstract
Abstract
Background: BRCA1/2 mutation carriers (gBRCA) have a higher risk of breast or ovarian cancer, since BRCA1/2 mutation results in impaired high-fidelity DNA repair by homologous recombination (HR) and subsequently genetic instability. In non-gBRCA TNBC, HR deficiency occurs at the somatic level, by means of BRCA1 mutation, BRCA1 epigenetic loss or mutation in other HR-associated genes. Because PARP1/2 inhibitors (PARPi) are well-tolerated and active anti-cancer agents in the advanced setting of gBRCA tumors, we sought to expand their applicability by identifying response biomarkers in TNBC.
Methods: We have assessed the antitumor response of the PARP1/2 inhibitor olaparib as single agent in a panel of 12 primary and advanced TNBC PDX models. On PDXs exhibiting primary sensitivity to olaparib, we have developed models of acquired resistance by continuous exposure to the drug and identifying progression on treatment. We have characterized the models through targeted sequencing and the analysis of the hypermethylation and expression levels of BRCA1 transcript to find potential correlates of drug-sensitivity.
Results: Three out of 12 PDXs (25%) treated with single agent olaparib, exhibit tumor regression or disease stabilization. BRCA1 is hypermethylated in two of these PARPi-sensitive TNBC PDX models and is associated with loss of BRCA1 mRNA expression. The third PARPi-sensitive TNBC PDX harbors a frameshift, heterozygous PALB2 mutation, which is no longer detected in the acquired resistance PDX model. Acquired resistance in the hypermethylated PDXs is under study as well as the duration of response compared to gBRCA PDX models.
Conclusions: Our study highlights that somatic HR-deficiency is frequent in TNBC and provides the basis of sensitivity to PARPi.
Citation Format: Serra V, Cruz C, Bruna A, Ibrahim YH, Vivancos A, Vivancos A, Nuciforo P, Bellet M, Gómez P, Pérez JM, Saura C, Vidal M, Serres X, Rueda OM, Peg V, Caldas C, O'Connor MJ, Baselga J, Cortés J. PARP1/2 inhibition in a subset of triple negative breast cancer (TNBC) patient-derived tumor xenografts (PDX) identifies predictive biomarkers of response. [abstract]. In: Proceedings of the Thirty-Eighth Annual CTRC-AACR San Antonio Breast Cancer Symposium: 2015 Dec 8-12; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2016;76(4 Suppl):Abstract nr P4-07-04.
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Affiliation(s)
- V Serra
- Vall d'Hebron Institute of Oncology (VHIO), Barcelona, Spain; Cancer Research UK, CI (CRUK), Cambridge, United Kingdom; Vall d'Hebron University Hospital (VHUH), Barcelona, Spain; Astra Zeneca (AZ), Macclesfield, United Kingdom; Netherlands Cancer Institute (NKI), Amsterdam, Netherlands; Memorial Sloan Kettering Cancer Center (MSKCC), NY
| | - C Cruz
- Vall d'Hebron Institute of Oncology (VHIO), Barcelona, Spain; Cancer Research UK, CI (CRUK), Cambridge, United Kingdom; Vall d'Hebron University Hospital (VHUH), Barcelona, Spain; Astra Zeneca (AZ), Macclesfield, United Kingdom; Netherlands Cancer Institute (NKI), Amsterdam, Netherlands; Memorial Sloan Kettering Cancer Center (MSKCC), NY
| | - A Bruna
- Vall d'Hebron Institute of Oncology (VHIO), Barcelona, Spain; Cancer Research UK, CI (CRUK), Cambridge, United Kingdom; Vall d'Hebron University Hospital (VHUH), Barcelona, Spain; Astra Zeneca (AZ), Macclesfield, United Kingdom; Netherlands Cancer Institute (NKI), Amsterdam, Netherlands; Memorial Sloan Kettering Cancer Center (MSKCC), NY
| | - YH Ibrahim
- Vall d'Hebron Institute of Oncology (VHIO), Barcelona, Spain; Cancer Research UK, CI (CRUK), Cambridge, United Kingdom; Vall d'Hebron University Hospital (VHUH), Barcelona, Spain; Astra Zeneca (AZ), Macclesfield, United Kingdom; Netherlands Cancer Institute (NKI), Amsterdam, Netherlands; Memorial Sloan Kettering Cancer Center (MSKCC), NY
| | - A Vivancos
- Vall d'Hebron Institute of Oncology (VHIO), Barcelona, Spain; Cancer Research UK, CI (CRUK), Cambridge, United Kingdom; Vall d'Hebron University Hospital (VHUH), Barcelona, Spain; Astra Zeneca (AZ), Macclesfield, United Kingdom; Netherlands Cancer Institute (NKI), Amsterdam, Netherlands; Memorial Sloan Kettering Cancer Center (MSKCC), NY
| | - A Vivancos
- Vall d'Hebron Institute of Oncology (VHIO), Barcelona, Spain; Cancer Research UK, CI (CRUK), Cambridge, United Kingdom; Vall d'Hebron University Hospital (VHUH), Barcelona, Spain; Astra Zeneca (AZ), Macclesfield, United Kingdom; Netherlands Cancer Institute (NKI), Amsterdam, Netherlands; Memorial Sloan Kettering Cancer Center (MSKCC), NY
| | - P Nuciforo
- Vall d'Hebron Institute of Oncology (VHIO), Barcelona, Spain; Cancer Research UK, CI (CRUK), Cambridge, United Kingdom; Vall d'Hebron University Hospital (VHUH), Barcelona, Spain; Astra Zeneca (AZ), Macclesfield, United Kingdom; Netherlands Cancer Institute (NKI), Amsterdam, Netherlands; Memorial Sloan Kettering Cancer Center (MSKCC), NY
| | - M Bellet
- Vall d'Hebron Institute of Oncology (VHIO), Barcelona, Spain; Cancer Research UK, CI (CRUK), Cambridge, United Kingdom; Vall d'Hebron University Hospital (VHUH), Barcelona, Spain; Astra Zeneca (AZ), Macclesfield, United Kingdom; Netherlands Cancer Institute (NKI), Amsterdam, Netherlands; Memorial Sloan Kettering Cancer Center (MSKCC), NY
| | - P Gómez
- Vall d'Hebron Institute of Oncology (VHIO), Barcelona, Spain; Cancer Research UK, CI (CRUK), Cambridge, United Kingdom; Vall d'Hebron University Hospital (VHUH), Barcelona, Spain; Astra Zeneca (AZ), Macclesfield, United Kingdom; Netherlands Cancer Institute (NKI), Amsterdam, Netherlands; Memorial Sloan Kettering Cancer Center (MSKCC), NY
| | - JM Pérez
- Vall d'Hebron Institute of Oncology (VHIO), Barcelona, Spain; Cancer Research UK, CI (CRUK), Cambridge, United Kingdom; Vall d'Hebron University Hospital (VHUH), Barcelona, Spain; Astra Zeneca (AZ), Macclesfield, United Kingdom; Netherlands Cancer Institute (NKI), Amsterdam, Netherlands; Memorial Sloan Kettering Cancer Center (MSKCC), NY
| | - C Saura
- Vall d'Hebron Institute of Oncology (VHIO), Barcelona, Spain; Cancer Research UK, CI (CRUK), Cambridge, United Kingdom; Vall d'Hebron University Hospital (VHUH), Barcelona, Spain; Astra Zeneca (AZ), Macclesfield, United Kingdom; Netherlands Cancer Institute (NKI), Amsterdam, Netherlands; Memorial Sloan Kettering Cancer Center (MSKCC), NY
| | - M Vidal
- Vall d'Hebron Institute of Oncology (VHIO), Barcelona, Spain; Cancer Research UK, CI (CRUK), Cambridge, United Kingdom; Vall d'Hebron University Hospital (VHUH), Barcelona, Spain; Astra Zeneca (AZ), Macclesfield, United Kingdom; Netherlands Cancer Institute (NKI), Amsterdam, Netherlands; Memorial Sloan Kettering Cancer Center (MSKCC), NY
| | - X Serres
- Vall d'Hebron Institute of Oncology (VHIO), Barcelona, Spain; Cancer Research UK, CI (CRUK), Cambridge, United Kingdom; Vall d'Hebron University Hospital (VHUH), Barcelona, Spain; Astra Zeneca (AZ), Macclesfield, United Kingdom; Netherlands Cancer Institute (NKI), Amsterdam, Netherlands; Memorial Sloan Kettering Cancer Center (MSKCC), NY
| | - OM Rueda
- Vall d'Hebron Institute of Oncology (VHIO), Barcelona, Spain; Cancer Research UK, CI (CRUK), Cambridge, United Kingdom; Vall d'Hebron University Hospital (VHUH), Barcelona, Spain; Astra Zeneca (AZ), Macclesfield, United Kingdom; Netherlands Cancer Institute (NKI), Amsterdam, Netherlands; Memorial Sloan Kettering Cancer Center (MSKCC), NY
| | - V Peg
- Vall d'Hebron Institute of Oncology (VHIO), Barcelona, Spain; Cancer Research UK, CI (CRUK), Cambridge, United Kingdom; Vall d'Hebron University Hospital (VHUH), Barcelona, Spain; Astra Zeneca (AZ), Macclesfield, United Kingdom; Netherlands Cancer Institute (NKI), Amsterdam, Netherlands; Memorial Sloan Kettering Cancer Center (MSKCC), NY
| | - C Caldas
- Vall d'Hebron Institute of Oncology (VHIO), Barcelona, Spain; Cancer Research UK, CI (CRUK), Cambridge, United Kingdom; Vall d'Hebron University Hospital (VHUH), Barcelona, Spain; Astra Zeneca (AZ), Macclesfield, United Kingdom; Netherlands Cancer Institute (NKI), Amsterdam, Netherlands; Memorial Sloan Kettering Cancer Center (MSKCC), NY
| | - MJ O'Connor
- Vall d'Hebron Institute of Oncology (VHIO), Barcelona, Spain; Cancer Research UK, CI (CRUK), Cambridge, United Kingdom; Vall d'Hebron University Hospital (VHUH), Barcelona, Spain; Astra Zeneca (AZ), Macclesfield, United Kingdom; Netherlands Cancer Institute (NKI), Amsterdam, Netherlands; Memorial Sloan Kettering Cancer Center (MSKCC), NY
| | - J Baselga
- Vall d'Hebron Institute of Oncology (VHIO), Barcelona, Spain; Cancer Research UK, CI (CRUK), Cambridge, United Kingdom; Vall d'Hebron University Hospital (VHUH), Barcelona, Spain; Astra Zeneca (AZ), Macclesfield, United Kingdom; Netherlands Cancer Institute (NKI), Amsterdam, Netherlands; Memorial Sloan Kettering Cancer Center (MSKCC), NY
| | - J Cortés
- Vall d'Hebron Institute of Oncology (VHIO), Barcelona, Spain; Cancer Research UK, CI (CRUK), Cambridge, United Kingdom; Vall d'Hebron University Hospital (VHUH), Barcelona, Spain; Astra Zeneca (AZ), Macclesfield, United Kingdom; Netherlands Cancer Institute (NKI), Amsterdam, Netherlands; Memorial Sloan Kettering Cancer Center (MSKCC), NY
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Pérez JM, Cano R, McGlacken GP, Ramón DJ. Palladium(ii) oxide impregnated on magnetite as a catalyst for the synthesis of 4-arylcoumarins via a Heck-arylation/cyclization process. RSC Adv 2016. [DOI: 10.1039/c6ra01731b] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Heck-arylation/cyclization was achieved using heterogeneous palladium(ii) oxide impregnated on magnetite catalyst (2.5 mol%) with a lower catalyst loading than that reported for similar processes.
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Affiliation(s)
- Juana M. Pérez
- Instituto de Síntesis Orgánica (ISO) and Departamento de Química Orgánica
- Facultad de Ciencias
- Universidad de Alicante
- E-03080-Alicante
- Spain
| | - Rafael Cano
- Department of Chemistry and Analytical & Biological Chemistry Research Facility (ABCRF)
- University College Cork
- Ireland
| | - Gerard P. McGlacken
- Department of Chemistry and Analytical & Biological Chemistry Research Facility (ABCRF)
- University College Cork
- Ireland
| | - Diego J. Ramón
- Instituto de Síntesis Orgánica (ISO) and Departamento de Química Orgánica
- Facultad de Ciencias
- Universidad de Alicante
- E-03080-Alicante
- Spain
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22
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Escudero D, Valentín MO, Escalante JL, Sanmartín A, Perez-Basterrechea M, de Gea J, Martín M, Velasco J, Pont T, Masnou N, de la Calle B, Marcelo B, Lebrón M, Pérez JM, Burgos M, Gimeno R, Kot P, Yus S, Sancho I, Zabalegui A, Arroyo M, Miñambres E, Elizalde J, Montejo JC, Domínguez-Gil B, Matesanz R. Intensive care practices in brain death diagnosis and organ donation. Anaesthesia 2015; 70:1130-9. [PMID: 26040194 DOI: 10.1111/anae.13065] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/13/2015] [Indexed: 12/30/2022]
Abstract
We conducted a multicentre study of 1844 patients from 42 Spanish intensive care units, and analysed the clinical characteristics of brain death, the use of ancillary testing, and the clinical decisions taken after the diagnosis of brain death. The main cause of brain death was intracerebral haemorrhage (769/1844, 42%), followed by traumatic brain injury (343/1844, 19%) and subarachnoid haemorrhage (257/1844, 14%). The diagnosis of brain death was made rapidly (50% in the first 24 h). Of those patients who went on to die, the Glasgow Coma Scale on admission was ≤ 8/15 in 1146/1261 (91%) of patients with intracerebral haemorrhage, traumatic brain injury or anoxic encephalopathy; the Hunt and Hess Scale was 4-5 in 207/251 (83%) of patients following subarachnoid haemorrhage; and the National Institutes of Health Stroke Scale was ≥ 15 in 114/129 (89%) of patients with strokes. Brain death was diagnosed exclusively by clinical examination in 92/1844 (5%) of cases. Electroencephalography was the most frequently used ancillary test (1303/1752, 70.7%), followed by transcranial Doppler (652/1752, 37%). Organ donation took place in 70% of patients (1291/1844), with medical unsuitability (267/553, 48%) and family refusal (244/553, 13%) the main reasons for loss of potential donors. All life-sustaining measures were withdrawn in 413/553 of non-donors (75%).
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Affiliation(s)
- D Escudero
- Intensive Care Unit, Central University Hospital of Asturias, Oviedo, Spain
| | - M O Valentín
- Spanish National Transplant Organization (ONT), Madrid, Spain
| | - J L Escalante
- Intensive Care Unit, Gregorio Marañón University Hospital, Madrid, Spain
| | - A Sanmartín
- Intensive Care Unit, Virgen de la Arrixaca Hospital, Murcia, Spain
| | - M Perez-Basterrechea
- Unit of Transplants, Cell Therapy and Regenerative Medicine, Central University Hospital of Asturias, Oviedo, Spain
| | - J de Gea
- Intensive Care Unit, Virgen de la Arrixaca Hospital, Murcia, Spain
| | - M Martín
- Intensive Care Unit, Central University Hospital of Asturias, Oviedo, Spain
| | - J Velasco
- Intensive Care Unit, Son Espases University Hospital, Palma de Mallorca, Spain
| | - T Pont
- Intensive Care Unit, Vall D'Hebron Hospital, Barcelona, Spain
| | - N Masnou
- Intensive Care Unit, Vall D'Hebron Hospital, Barcelona, Spain
| | - B de la Calle
- Intensive Care Unit, Gregorio Marañón University Hospital, Madrid, Spain
| | - B Marcelo
- Intensive Care Unit, Infanta Cristina University Hospital, Badajoz, Spain
| | - M Lebrón
- Intensive Care Unit, Carlos Haya Hospital, Málaga, Spain
| | - J M Pérez
- Intensive Care Unit, Virgen de las Nieves University Hospital, Granada, Spain
| | - M Burgos
- Intensive Care Unit, Virgen de las Nieves University Hospital, Granada, Spain
| | - R Gimeno
- Intensive Care Unit, La Fe University Hospital, Valencia, Spain
| | - P Kot
- Intensive Care Unit, La Paz University Hospital, Madrid, Spain
| | - S Yus
- Intensive Care Unit, La Paz University Hospital, Madrid, Spain
| | - I Sancho
- Intensive Care Unit, Miguel Servet University Hospital, Zaragoza, Spain
| | - A Zabalegui
- Intensive Care Unit, General Yagüe Hospital, Burgos, Spain
| | - M Arroyo
- Intensive Care Unit, General Yagüe Hospital, Burgos, Spain
| | - E Miñambres
- Intensive Care Unit, Marqués de Valdecilla University Hospital, Santander, Spain
| | - J Elizalde
- Intensive Care Unit, Asistential Complex of Navarra, Pamplona, Spain
| | - J C Montejo
- Intensive Care Unit, 12 de Octubre University Hospital, Madrid, Spain
| | - B Domínguez-Gil
- Spanish National Transplant Organization (ONT), Madrid, Spain
| | - R Matesanz
- Spanish National Transplant Organization (ONT), Madrid, Spain
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Fidalgo LE, López-Beceiro AM, Vila-Pastor M, Martínez-Carrasco C, Barreiro-Vázquez JD, Pérez JM. Use of computed tomography as a non-invasive method for diagnosing cephenemyiosis in roe deer (Capreolus capreolus). Med Vet Entomol 2015; 29:110-113. [PMID: 25294557 DOI: 10.1111/mve.12087] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Revised: 07/09/2014] [Accepted: 07/10/2014] [Indexed: 06/03/2023]
Abstract
This study was conducted to assess the reliability of computed tomography (CT) for diagnosing bot fly infestations by Cephenemyia stimulator (Clark) (Diptera: Oestridae) in roe deer (Capreolus capreolus L.) (Artiodactyla: Cervidae). For this purpose, the heads of 30 animals were analysed, firstly by CT and then by necropsy, which was used as the reference standard method. The prevalence values obtained by both methods were identical; the prevalence of infestation was 40.0% overall, and was higher in males (45.5%) than in females (25.0%). These results highlight the usefulness of CT as an alternative or non-invasive method for diagnosing cephenemyiosis in live-captured roe deer and in hunting trophies or museum collections that cannot be destroyed or damaged.
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Affiliation(s)
- L E Fidalgo
- Departamento de Ciencias Clínicas Veterinarias, Universidad de Santiago de Compostela, Lugo, Spain
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Pérez JM, Maldonado ME, Rojano BA, Alzate F, Sáez J, Cardona W. Comparative Antioxidant, Antiproliferative and Apoptotic Effects of Ilex laurina and Ilex paraguariensis on Colon Cancer Cells. TROP J PHARM RES 2014. [DOI: 10.4314/tjpr.v13i8.12] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Pérez JM, Ramón DJ. Cobalt-Impregnated Magnetite as General Heterogeneous Catalyst for the Hydroacylation Reaction of Azodicarboxylates. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400207] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Abstract
Multicomponent azide–alkyne cycloaddition catalyzed by impregnated bimetallic nickel and copper on magnetite.
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Affiliation(s)
- Juana M. Pérez
- Instituto de Síntesis Orgánica (ISO), and Departamento de Química Orgánica
- Facultad de Ciencias
- Universidad de Alicante
- E-03080-Alicante, Spain
| | - Rafael Cano
- Instituto de Síntesis Orgánica (ISO), and Departamento de Química Orgánica
- Facultad de Ciencias
- Universidad de Alicante
- E-03080-Alicante, Spain
| | - Diego J. Ramón
- Instituto de Síntesis Orgánica (ISO), and Departamento de Química Orgánica
- Facultad de Ciencias
- Universidad de Alicante
- E-03080-Alicante, Spain
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Pérez JM, Cano R, Yus M, Ramón DJ. Straightforward Synthesis of Aromatic Imines from Alcohols and Amines or Nitroarenes Using an Impregnated Copper Catalyst. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200319] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Besga A, Termenon M, Graña M, Echeveste J, Pérez JM, Gonzalez-Pinto A. Discovering Alzheimer's disease and bipolar disorder white matter effects building computer aided diagnostic systems on brain diffusion tensor imaging features. Neurosci Lett 2012; 520:71-6. [PMID: 22617636 DOI: 10.1016/j.neulet.2012.05.033] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2011] [Revised: 02/13/2012] [Accepted: 05/10/2012] [Indexed: 10/28/2022]
Abstract
The aim of this study is to look for differential effects in white matter (WM) of bipolar disorder (BD) and Alzheimer's disease (AD) patients. We proceed by investigating the feasibility of discriminating between BD and AD patients, and from healthy controls (HC), using multivariate data analysis based on diffusion tensor imaging (DTI) data features. Specifically, support vector machine (SVM) classifiers were trained and tested on fractional anisotropy (FA). Voxel sites are selected as features for classification if their Pearson's correlation between FA values at voxel site across subjects and the indicative variable specifying the subject class is above the threshold set by a percentile of its empirical distribution. To avoid double dipping, selection was performed only on training data in a leave one out cross-validation study. Classification results show that FA features and a linear SVM classifier achieve perfect accuracy, sensitivity and specificity in AD vs. HC, BD vs. HC, and AD vs. BD leave-one-out cross-validation studies. The localization of the discriminant voxel sites on a probabilistic tractography atlas shows effects on seven major WM tracts in each hemisphere and two commissural tracts.
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Affiliation(s)
- A Besga
- Unidad de Investigación en Psiquiatría, Hospital Santiago Apostol, Vitoria-Gasteiz, Spain
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Valcárcel L, Kortajarena J, García M, Fernández JM, Lezcano E, Losada J, Ruiz J, Álvarez A, Pérez JM, Iriondo M, Aguirre A. C02 Analysis of the instability of the CAG trinucleotide repeat and the age of onset in a Huntington's disease population from the Basque country. J Neurol Neurosurg Psychiatry 2010. [DOI: 10.1136/jnnp.2010.222588.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Moreno M, Rincon E, Pérez JM, González VM, Domingo A, Dominguez E. Selective immobilization of oligonucleotide-modified gold nanoparticles by electrodeposition on screen-printed electrodes. Biosens Bioelectron 2009; 25:778-83. [PMID: 19783422 DOI: 10.1016/j.bios.2009.08.028] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2009] [Revised: 08/17/2009] [Accepted: 08/19/2009] [Indexed: 02/05/2023]
Abstract
Here, we describe a proof of concept procedure for the selective immobilization of oligonucleotides functionalized gold nanoparticle probes (affinity modules) on arrayed screen-printed gold electrodes. Current microarrays are using many different ways to address their DNA probes onto the transducer area. For that reason, we have mixed the electrodeposition of metals, which is a very well known process, in addition with the DNA-gold nanoparticles formation, which is an area of great interest in biosensing applications in the field of genomics, clinical and warfare applications. Combining these fields, we have developed a novel method for the immobilization of gold nanoparticles conjugated with oligonucleotides (affinity modules) onto screenprinting gold electrodes through electrodeposition at a current positive potential of 800mV vs. Ag/AgCl. The modules were selectively immobilized onto the electrode surface being, afterwards, ready for a successful hybridization. The gold colloids take the advantage of being a carrier that allows the immobilization of any kind of bioreceptor in the same conditions and the capability of quality control analysis before the electrodeposition procedure. With this system, we avoided non-specific interactions between the transduction layer and the bioreceptor and in the case of DNA oligonucleotides allowed us the immobilization of multiple sequences in a multimodular device for a further industrial process of cheaper biochip fabrication.
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Affiliation(s)
- M Moreno
- Departamento Bioquímica y Biología Molecular, Universidad de Alcalá, 28871 Alcalá de Henares, Madrid, Spain.
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Alasaad S, Morrondo P, Dacal-Rivas V, Soriguer RC, Granados JE, Serrano E, Zhu XQ, Rossi L, Pérez JM. Bronchopulmonary nematode infection of Capra pyrenaica in the Sierra Nevada massif, Spain. Vet Parasitol 2009; 164:340-3. [PMID: 19596519 DOI: 10.1016/j.vetpar.2009.06.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2009] [Revised: 06/06/2009] [Accepted: 06/15/2009] [Indexed: 10/20/2022]
Abstract
The present investigation examined the prevalence and abundance of bronchopulmonary nematodes in 213 randomly hunted Iberian ibexes (Capra pyrenaica) (87 females and 126 males) in the Sierra Nevada mountain range in Spain between 2003 and 2006. Post mortem examination revealed an overall prevalence of 72% for adult nematodes (Cystocaulus ocreatus 44%, Muellerius capillaris 44%, Protostrongylus sp. 40%, and Dictyocaulus filaria 4%). The abundances were 13.45+/-3.97, 5.18+/-2.49, 6.36+/-2.16, and 2.27+/-0.46, respectively. Protostrongylid adults showed similar infection rates, which were statistically different from that of D. filaria. 20% of the examined Iberian ibexes were infected by three protostrongylid nematodes species, 24% of C. pyrenaica were affected by two protostrongylid species, while infestations with only one protostrongylid species were detected in 20% of the examined animals. The overall prevalence of larvae nematodes in the examined animals was 100%, and the overall abundance (number of the first stage larvae per gram) was 86.45+/-20.63. There was a high correlation between the two sets of data (adults and larvae). Results of the present investigation provided foundation for the effective control of bronchopulmonary nematode infection in Iberian ibex.
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Affiliation(s)
- S Alasaad
- Department of Ecology and Sylviculture, Euphrates University, 3314 Deir Ez-Zor, Syria.
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Golombek SG, Sola A, Baquero H, Borbonet D, Cabañas F, Fajardo C, Goldsmit G, Lemus L, Miura E, Pellicer A, Pérez JM, Rogido M, Zambosco G, van Overmeire B. [First SIBEN clinical consensus: diagnostic and therapeutic approach to patent ductus arteriosus in premature newborns]. An Pediatr (Barc) 2009; 69:454-81. [PMID: 19128748 DOI: 10.1157/13128003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
OBJECTIVE To report the process and results of the first neonatal clinical consensus of the Ibero-American region. DESIGN AND METHODS Two recognized experts in the field (Clyman and Van Overmeire) and 45 neonatologists from 23 countries were invited for active participation and collaboration. We developed 46 questions of clinical-physiological relevance in all aspects of patent ductus arteriosus (PDA). Guidelines for consensus process, literature search and future preparation of educational material and authorship were developed, reviewed and agreed by all. Participants from different countries were distributed in groups, and assigned to interact and work together to answer 3-5 questions, reviewing all global literature and local factors. Answers and summaries were received, collated and reviewed by 2 coordinators and the 2 experts. Participants and experts met in Granada, Spain for 4.5 h (lectures by experts, presentations by groups, discussion, all literature available). RESULTS 31 neonatologists from 16 countries agreed to participate. Presentations by each group and general discussion were used to develop a consensus regarding: general management, availability of drugs (indomethacin vs. ibuprofen), costs, indications for echo/surgery, etc. Many steps were learnt by all present in a collaborative forum. CONCLUSIONS This first consensus group of Ibero-American neonatologists SIBEN led to active and collaborative participation of neonatologists of 16 countries, improved education of all participants and ended with consensus development on clinical approaches to PDA. Furthermore, it provides recommendations for clinical care reached by consensus. Additionally, it will serve as a useful foundation for future SIBEN Consensus on other topics and it could become valuable as a model to decrease disparity in care and improve outcomes in this and other regions.
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Affiliation(s)
- S G Golombek
- SIBEN, Sociedad Iberoamericana de Neonatología, The Regional Neonatal Center, Maria Fareri Children's Hospital at Westchester Medical Center/New York Medical College-Valhalla, Valhalla, New York 10595, USA.
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Alasaad S, Rossi L, Soriguer RC, Rambozzi L, Soglia D, Pérez JM, Zhu XQ. Sarcoptes mite from collection to DNA extraction: the lost realm of the neglected parasite. Parasitol Res 2009; 104:723-32. [PMID: 19159955 DOI: 10.1007/s00436-009-1333-0] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2008] [Accepted: 01/07/2009] [Indexed: 11/26/2022]
Abstract
Sarcoptes mite from collection to DNA extraction forms the cornerstone for studies on Sarcoptes scabiei. Whilst the new science era took a shy leap into the different facets of mite studies, the cornerstone was almost entirely neglected. Mite collection, cleaning, storage and DNA extraction were, basically, humble attempts to extrapolate, adapt, modify or 'pirate' those existing methods to the peculiarities of Sarcoptes research. These aspects usually constituted few lines, bashfully mentioned, in the materials and methods section of some papers, which arose in unique problems concerning cost-effectiveness, time profitability, safety and even worse, the credibility of the results, creating contradictory conclusions in some cases. This 'noisy' situation encouraged us to collect, classify and review, for the first time to our knowledge, some aspects relating to studies on Sarcoptes mite from collection to DNA extraction, which will be useful for further studies on Sarcoptes, and have implications for the effective control of the diseases Sarcoptes mite causes. Further studies are needed, especially to compare the profitability, safety, sensibility and specificity of the different methods of this neglected realm of the ubiquitous ectoparasite.
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Affiliation(s)
- S Alasaad
- Department of Ecology and Sylviculture, Aleppo University, 20333 Aleppo, Syria.
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Alasaad S, Rossi L, Maione S, Sartore S, Soriguer RC, Pérez JM, Rasero R, Zhu XQ, Soglia D. HotSHOT Plus ThermalSHOCK, a new and efficient technique for preparation of PCR-quality mite genomic DNA. Parasitol Res 2008; 103:1455-7. [PMID: 18685866 DOI: 10.1007/s00436-008-1127-9] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2008] [Accepted: 07/14/2008] [Indexed: 11/27/2022]
Abstract
The present study adapted the HotSHOT method, a technique which has been successfully applied on different kinds of tissues, to studies of Sarcoptes. Some modifications of this technique were made which allowed the quick preparation of PCR-quality Sarcoptes genomic DNA (gDNA), namely applying sodium hydroxide as a substrate for three cycles of thermal shock, followed by a short incubation and pH adjustment with a Tris solution (HotSHOT Plus ThermalSHOCK). The performance of this technique was tested by amplifying a approximately 450-bp rDNA fragment of the second internal transcribed spacer (ITS-2) and by multi-locus genotyping using ten microsatellites on 520 individual Sarcoptes samples. No difference in performance was observed between gDNA samples prepared using the HotSHOT Plus ThermalSHOCK technique and those prepared using a commercial kit utilizing proteinase K digestion. The results demonstrated that the HotSHOT Plus ThermalSHOCK technique is time-saving, economic, and easily automatable for the preparation of PCR-quality mite gDNA, which has implications for studying the molecular biology of mites with human and animal health significance. Although tested in the present study using Sarcoptes mites as a model, this technique may find broad applicability in extraction of gDNA from other parasites with small sizes and hard bodies.
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Affiliation(s)
- S Alasaad
- Departamento de Biología Animal, Biología Vegetal y Ecología, Universidad de Jaén, Campus Las Lagunillas, s. n., 23071 Jaén, Spain
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Palmateer AJ, Pérez JM, Cating RA, Ploetz RC, Hoy MA. First Report of Tar Spot on Orange Geiger, Cordia sebestena, Caused by Diatractium cordianum in Florida. Plant Dis 2008; 92:1250. [PMID: 30769475 DOI: 10.1094/pdis-92-8-1250b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
In July 2007, tar spot symptoms were observed on the leaves of orange Geiger, Cordia sebestena L. (Boraginaceae), in the landscape and a commercial nursery in Homestead, FL. The disease appears to be spreading and is locally severe. Symptoms were circular, slightly hypertrophied spots approximately 5 to 8 cm in diameter, which were slightly chlorotic on the abaxial surface and had numerous circular blackened stroma, 0.2 to 0.4 mm in diameter, on the adaxial surface. As leaves aged and yellowed, the areas around the spots remained pale green. Embedded in the stroma were numerous perithecia, 173 to 312 μm in diameter, circular to irregular in shape, with lateral necks as much as 200 μm long and 73 to 104 μm in diameter. Asci, 77 to 92 × 11 to 13 μm, contained elongate, two-celled ascospores, 50 to 61 × 3 to 5 μm that had a conspicuous constriction at the dividing cell wall. These dimensions and the pathogen's appearance matched closely with those published for Diatractium cordianum (Ellis & Kelsey) Syd (1). Young, symptomless leaves of C. sebestena were sprayed to runoff with a suspension of ascospores approximately 104 ml-1 that were harvested from affected leaves. Inoculated leaves were placed on water-saturated paper towels in petri plates and maintained in a growth chamber at 25°C with fluorescent light at 10 h day-1. Symptoms similar to those observed on affected trees in the landscape began to develop after 21 days and perithecia were evident after 28 days. An ITS 1, ITS 2, and 5.8s rDNA sequence was deposited in GenBank (Accession No. EU541488). A herbarium specimen was deposited at the U.S. National Fungus Collections (BPI No. 878441). This is a new host record for D. cordianum and is the first time the pathogen has been reported in the United States. Previous records were from Venezuela and several Caribbean islands, including Cuba and Jamaica. Symptoms of this disease have not been observed on Texas wild olive, Cordia boissieri, in close proximity to affected C. sebestena. P. F. Cannon (1) indicated that the disease had no economic impact. However, the conspicuous nature of symptoms on C. sebestena and the importance of this tree in the South Florida ornamental trade (2) suggest that this disease may become significant on the latter host. References: (1) P. F. Cannon. Mycol. Res. 92:327, 1989. (2) E. F. Gilman and D. G. Watson. Fact Sheet ST-182. Univ. Fla, Fla Coop Ext. Serv., 1993.
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Affiliation(s)
- A J Palmateer
- University of Florida, IFAS, Tropical Research and Education Center, Homestead 33031
| | - J M Pérez
- University of Florida, IFAS, Tropical Research and Education Center, Homestead 33031
| | - R A Cating
- University of Florida, IFAS, Tropical Research and Education Center, Homestead 33031
| | - R C Ploetz
- University of Florida, IFAS, Tropical Research and Education Center, Homestead 33031
| | - M A Hoy
- University of Florida, IFAS, Tropical Research and Education Center, Homestead 33031
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Roca J, Pérez JM, Colmenero M, Muñoz H, Alarcón L, Vázquez G. [Professional competence for the care of critical patients: beyond specialities]. Med Intensiva 2008; 31:473-84. [PMID: 18039447 DOI: 10.1016/s0210-5691(07)74854-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
OBJECTIVE To elaborate a working document to describe the professional competence (knowledge, skills, and attitudes) required of a physician for the care of critical patients, regardless of the physician's specialty and centered on the patients' needs. METHODS This study was carried out through field work using qualitative methodology over the 12-month period comprising 2004. The document was elaborated in four stages: 1) conceptual delimitation; 2) selection of working definitions and classifications; 3) identification of knowledge, skills, and attitudes necessary for the management of critical patients; and 4) final draft of the competence document. RESULTS A total of 146 areas of competence were identified; of these, 33% were related to knowledge, 52% to skills, and the remaining 15% to attitudes. CONCLUSIONS This study can help to ensure that critical patients will be cared for by physicians capable of identifying their problems and managing them appropriately, regardless of the physicians' specialty background. In responding to this situation, the document recognizes the participation of physicians trained in diverse specialties in the care of the critical patient by scaling the knowledge required at different levels of care.
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Affiliation(s)
- J Roca
- Servicio de Cuidados Críticos y Urgencias, Hospital Universitario Virgen de las Nieves, Granada, España.
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Alasaad S, Huang CQ, Li QY, Granados JE, García-Romero C, Pérez JM, Zhu XQ. Characterization of Fasciola samples from different host species and geographical localities in Spain by sequences of internal transcribed spacers of rDNA. Parasitol Res 2007; 101:1245-50. [PMID: 17610081 DOI: 10.1007/s00436-007-0628-2] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2007] [Accepted: 06/04/2007] [Indexed: 11/30/2022]
Abstract
In the present study, 25 samples representing Fasciola (Platyhelminthes: Trematoda: Digenea) from nine host species and 19 geographical locations in Spain were characterized genetically by sequences of the first (ITS-1) and second (ITS-2) internal transcribed spacers (ITS) of nuclear ribosomal DNA (rDNA). The ITS rDNA was amplified from individual liver flukes by polymerase chain reaction (PCR), and the amplicons were sequenced directly. The lengths of the ITS-1 and ITS-2 sequences were 422 and 362 bp, respectively, for all Spanish liver fluke samples sequenced. Comparison of the ITS sequences of the Spanish Fasciola samples examined in the present study with that of Fasciola hepatica, Fasciola gigantica and the "intermediate Fasciola" revealed that all Spanish Fasciola samples examined represent the single species of F. hepatica, with only slight sequence variation in the ITS-2 (1/362, 0.3%) among the sequenced samples, but the sequence variation was not related to particular host species and/or geographical origins of the samples. The Spanish F. hepatica examined differed from Fasciola from elsewhere by two nucleotides in the ITS-2, which provided genetic marker for the differentiation of Spanish F. hepatica from Fasciola from other geographical localities. These results have implications for studying the population genetic structure of the Spanish F. hepatica and for the diagnosis and control of the disease it causes.
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Affiliation(s)
- S Alasaad
- Departamento de Biología Animal, Biología Vegetal y Ecología, Universidad de Jaén, Campus Las Lagunillas, s. n., E-23071, Jaén, Spain
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Pérez JM, Granados JE, Moreno V, Calabuig G, Moço G, Serrano E. In vitrorearingOestrus caucasicusthird-instar larvae and pupae (Diptera: Oestridae) from naturally-infested Iberian ibex,Capra pyrenaica(Artiodactyla: Bovidae). Parasite 2006; 13:305-10. [PMID: 17285851 DOI: 10.1051/parasite/2006134305] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [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: 11/14/2022] Open
Abstract
Third-instar Oestrus caucasicus larvae (n = 236) obtained from Iberian ibex, Copra pyrenaica, were reared in a laboratory to obtain adult flies. They were maintained at a temperature of 21.9 +/- 2.7 degrees C and a relative humidity of 38.9 +/- 8.0 %. In all, 78 imagos emerged (33.1 %), with a sex-ratio at emergence not differing significantly from 1:1; 25 larvae did not complete pupariation. A total of 14 adult flies (17.9 % of the adults obtained) showed malformations, mainly in their wings. The pupariation period lasted around 30 hours and the pupal stage lasted on average 29.8 +/- 6.8 days. The success of pupation in both sexes was mainly determined by the weight of the larvae. Sexual dimorphism, with higher weights in females, was evident in third-instar arvae, pupae and adults. The mean longevity of adult flies was 224.8 +/- 91.4 hours and males generally survived for onger than the females.
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Affiliation(s)
- J M Pérez
- Departamento de Biología Animal, Biología Vegetal y Ecología, Universidad de Jaén, Campus Las Lagunillas, E-23071, Jaén, Spain.
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Serrano E, Pérez JM, Christiansen P, Gállego L. Sex-Difference in The Ossification Rate of The Appendicular Skeleton in Capra pyrenaica Schinz, 1838, and Its Utility in The Sex Identification of Long Bones. Anat Histol Embryol 2006; 35:69-75. [PMID: 16542170 DOI: 10.1111/j.1439-0264.2005.00638.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [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: 11/30/2022]
Abstract
The main goal of our work is to quantify differences in the rate of ossification in post-cranial Iberian ibex skeletons, related to sex. Another objective is to improve criteria for assessing the sex of post-cranial bones by combining the degree of ossification of the distal epiphysis and biometrical data. Forty Capra pyrenaica skeletons were examined in order to determine the degree of ossification by means of an Ossification Index. Our results evidence that sexual differences in the rate of ossification become visible at 6 months of age. On average, females complete their bone development 2 years before males do. Finally, by means of lineal classification functions which take into account both biometrical and anatomical criteria, we can achieve, in average, a 95.5% of correct sex discrimination within a sample consisting of ibex metacarpi and metatarsi from individuals aging from <1 to 12 years. Therefore, we conclude that the rhythm of ossification in the post-cranial skeleton of C. pyrenaica may be used as a criterion for assessing the sex of skeletal remains and could be applicable to other dimorphic ungulates. Nevertheless, the results obtained for specimens belonging to a particular population may have limited application to other populations with different medium sizes and living at particular densities within habitats with variable quality.
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Affiliation(s)
- E Serrano
- Departamento de Biología Animal, Biología Vegetal y Ecología, Universidad de Jaén, Paraje Las Lagunillas, s.n., E-23071, Jaén, Spain.
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Navarro-Ranninger C, LóPez-Solera I, Pérez JM, Masaguer JR, Alonso C. In vitroantitumour activity of two isomeric cyclopalladiated compounds derived from benzoylbenzylidenimines. Appl Organomet Chem 2004. [DOI: 10.1002/aoc.590070107] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Saavedra CP, Encinas MV, Araya MA, Pérez JM, Tantaleán JC, Fuentes DE, Calderón IL, Pichuantes SE, Vásquez CC. Biochemical characterization of a thermostable cysteine synthase from Geobacillus stearothermophilus V. Biochimie 2004; 86:481-5. [PMID: 15308337 DOI: 10.1016/j.biochi.2004.06.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2004] [Accepted: 06/11/2004] [Indexed: 11/21/2022]
Abstract
The cysK gene encoding a cysteine synthase of Geobacillus stearothermophilus V was overexpressed in E. coli and the recombinant protein was purified and characterized. The enzyme is a thermostable homodimer (32 kDa/monomer) belonging to the beta family of pyridoxal phosphate (PLP)-dependent enzymes. UV-visible spectra showed absorption bands at 279 and 410 nm. The band at 279 nm is due to tyrosine residues as the enzyme lacks tryptophan. The 410 nm band represents absorption of the coenzyme bound as a Schiff base to a lysine residue of the protein. Fluorescence characteristics of CysK's Schiff base were influenced by temperature changes suggesting different local structures at the cofactor binding site. The emission of the Schiff base allowed the determination of binding constants for products at both 20 degrees C and 50 degrees C. At 50 degrees C and in the absence of sulphide the enzyme catalyzes the decomposition of O-acetyl-l-serine to pyruvate and ammonia. At 20 degrees C, however, a stable alpha-aminoacrylate intermediate is formed.
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Affiliation(s)
- C P Saavedra
- Laboratorio de Microbiología Molecular, Facultad de Química y Biología, Universidad de Santiago de Chile, Casilla 40, Correo 33, Santiago, Chile
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Pérez-Cabré M, Cervantes G, Moreno V, Prieto MJ, Pérez JM, Font-Bardia M, Solans X. Pd(II) and Pt(II) complexes with aromatic diamines: study of their interaction with DNA. J Inorg Biochem 2004; 98:510-21. [PMID: 14987853 DOI: 10.1016/j.jinorgbio.2003.12.022] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2003] [Revised: 12/12/2003] [Accepted: 12/31/2003] [Indexed: 10/26/2022]
Abstract
Pd(II) and Pt(II) new complexes with simple aromatic diamines were synthesised and characterised with the aim of studying their possible antitumour activity. The aromatic diamines chosen were 2,3-diaminotoluene (2,3 dat), 3,4-diaminotoluene (3,4 dat), 4,5-diaminoxylene (4,5 dax) and 2,3-diaminophenol (2,3 dap). The complexes, of formulae cis-[MCl(2)(diamine)], were characterised by elemental analysis, conductivity measurements, 1H, 13C(1H) and 195Pt NMR spectroscopy. The X-ray crystal structure was also resolved for the palladium complexes with 2,3-diaminotoluene and 4,5-diaminoxylene. The DNA adduct formation of the eight new complexes synthesised was followed by circular dichroism and electrophoretic mobility. Atomic force microscopy images of the modifications caused by the complexes on plasmid DNA pBR322 were also obtained. Values of IC50 were also calculated for the four platinum complexes against the cisplatin resistant tumour cell line A2780cisR.
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Affiliation(s)
- M Pérez-Cabré
- Departament de Química Inorgànica, Universitat de Barcelona, Diagonal 647, E-08028 Barcelona, Spain
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Serrano E, Gállego L, Pérez JM. Ossification of the Appendicular Skeleton in the Spanish Ibex Capra pyrenaica Schinz, 1838 (Artiodactyla: Bovidae), with Regard to Determination of Age. Anat Histol Embryol 2004; 33:33-7. [PMID: 15027960 DOI: 10.1111/j.1439-0264.2004.00506.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [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: 11/29/2022]
Abstract
We studied ossification macroscopically in 35 Spanish ibex (Capra pyrenaica) appendicular skeletons in order to establish the skeletochronology in both sexes of the species. The age of animals had been determined by means of horn segment counts, teeth replacement and cementum layer counts from first incisors and ranged from <1 to 12 years. Females showed a faster ossification process than males. Moreover, for each age or year class considered, regarding both sexes, different stages of epiphyseal fusion could be found. Therefore, if we try to use data from bone remains in population studies (e.g. differential mortality rates), determination of the ossification stage for ageing bone samples must be carried out with caution.
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Affiliation(s)
- E Serrano
- Departamento de Biología Animal, Biología Vegetal y Ecología, Universidad de Jaén, Jaén, Spain
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Espino MS, Navarro CJ, Pérez JM. Chihuahua: a water reuse case in the desert. Water Sci Technol 2004; 50:323-328. [PMID: 15344808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Water supply for all kind of uses in Chihuahua is mainly groundwater. During the last decade this city has been damaged with a heavy hydrologic crisis because of a persistent drought. This came up with the overexploitation of groundwater aquifers; therefore a deficit between demand and offer was done. To minimize this problem the government authorities have started an integral plan of optimizing hydrologic resources which considers the treatment of wastewater and the use of reclaimed water. The secondary wastewater treatment facility of the city treats about 30,000 m3/d of a wastewater with high organic contents, and produces an effluent with low concentration of suspended solids, organic matter, fats, detergents, and metals. Reclaimed water is conveyed toward strategic sites for the irrigation of great green areas in sport clubs, educational institutions and industrial zones, besides of its utilization on some manufacturing processes, road service, and also over construction industry. The potential reuse of this water goes farther from those activities; the treatment of the secondary effluent until the required levels of the water-bearing recharge criteria are met for drinking water supply is considered as the next step to achieve through a suitable planning strategy for the best integral resource advantage.
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Affiliation(s)
- M S Espino
- Junta Central de Agua y Saneamiento de Chihuahua, Teófilo Borunda 500, Chihuahua, Chihuahua, México.
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Fuertes MA, Castilla J, Alonso C, Pérez JM. Cisplatin biochemical mechanism of action: from cytotoxicity to induction of cell death through interconnections between apoptotic and necrotic pathways. Curr Med Chem 2003; 10:257-66. [PMID: 12570712 DOI: 10.2174/0929867033368484] [Citation(s) in RCA: 291] [Impact Index Per Article: 13.9] [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: 11/22/2022]
Abstract
Although cisplatin, cis-diamminedichloroplatinum(II), has been successfully used in the chemotherapy of cancer for more than 25 years, its biochemical mechanism of action is still unclear. The current accepted paradigm about cisplatin mechanism of action is that the drug induces its cytotoxic properties through binding to nuclear DNA and subsequent interference with normal transcription, and/or DNA replication mechanisms. If cisplatin-DNA adducts are not efficiently processed by cell machinery, cytotoxic processes eventually end up in cell death. However, before cisplatin enters the cell it may bind to phospholipids and phosphatidylserine in the cell membrane. In addition, in the cytoplasm many potential platinum-binding sites are also available, including RNA and sulfur-containing biomolecules. Moreover, there is much evidence suggesting that the cytotoxic effects induced by binding of cisplatin to non-DNA targets (especially proteins) may contribute to its biochemical mechanism of action. On the other hand, it has been found that several factors such as the dose of drug as well as the metabolic condition of the cell subjected to cisplatin aggression, may determine that cancer cells die through apoptosis or necrosis. In fact, it has recently been reported that both mechanisms of cell demise work in concert so that within a population of tumour cells there is a continuum of possible modes of cell death.
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Affiliation(s)
- M A Fuertes
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049-Madrid, Spain
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Abstract
The limitations of cisplatin as an anticancer drug have stimulated the search for other antitumor-active platinum complexes with improved pharmacological properties. The two main goals in the search for new platinum anti-cancer agents are the reduction of the dose-limiting toxicities of cisplatin and the circumvention of cisplatin resistance. However, it should be pointed out that this has proven to be a difficult task. In fact, less than 1% of the thousand of platinum complexes tested for pre-clinical antitumor activity have entered clinical trials in the past 30 years. Nonetheless, right now, several new platinum complexes are in clinical trials, a proof of the continued belief that platinum complexes may still fulfil the needs for novel antitumor drugs. This review will focus on the three main innovative approaches found in the platinum anticancer-field, namely, (1) compounds with decreased reactivity against nucleophiles, (2) compounds with carrier ligands, and (3) compounds which bind differently to DNA as compared to cisplatin. In the latter class, special attention is paid to dinuclear and polinuclear platinum complexes.
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Affiliation(s)
- M A Fuertes
- Departamento de Química Inorgánica. Facultad de Ciencias. Universidad Autónoma de Madrid. 28049-Madrid. Spain.
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Herrera A, Pérez JM, Cuenca J, Martínez J. Treatment of humeral shaft nonunion by external fixation: a valuable option. J Orthop Sci 2001; 6:238-41. [PMID: 11484117 DOI: 10.1007/s007760100041] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/21/2000] [Accepted: 12/22/2000] [Indexed: 11/26/2022]
Abstract
We report the treatment of six patients with nonunion of the humerus, using a unilateral fixator and bone grafting. Union was obtained in all patients, with an average time to union of 4.5 months. Superficial pin tract infection was seen in five patients, but resolved uneventfully. One patient had transient radial nerve palsy. The results, according to the Stewart and Hundley criteria, were excellent in one patient, good in three, fair in one, and poor in one. The main cause of the fair and poor results was marked limitation of shoulder and elbow motion. This method, however, seems to be therapeutically effective.
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Fuertes MA, Pérez JM, González VM, Alonso C. A kinetic model for the B-Z transition of poly[d(G-C)].poly[d(G-C)] and poly[d(G-m5C)].poly[d(G-m5C)]. J Biol Inorg Chem 2001; 6:675-82. [PMID: 11681701 DOI: 10.1007/s007750100244] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [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: 02/05/2023]
Abstract
The analysis of the kinetic data of the B-Z conformational changes induced by salt in sized double-stranded poly[d(G-C)].poly[d(G-C)] and poly[d(G-m5C)].poly[d(G-m5C)] polymers indicated that there exists a salt threshold which reveals some largely, as yet, unrecognised characteristics of the transition. It was observed that there is a direct correlation between the length of the polymer and the rate of the B-Z transition when the salt concentration in the polymer solution is lower than the salt threshold. The correlation is inverse when the salt concentration is higher than the salt threshold. Thus, the molecular mechanism of the B- to Z-DNA transition varies depending on whether the salt concentration is higher or lower than the threshold. In this context, we have found that the contrasting results reported in the literature describing the rate of the B-Z transition are not contradictory but complementary. The finding of a salt threshold leads to the establishment of a relationship between the cooperativity index of the B-Z transition and the polymer chain length. That relationship is dependent on the chemical structure of the polymer but is temperature independent.
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Affiliation(s)
- M A Fuertes
- Centro de Biologia Molecular Severo Ochoa (CSIC-UAM), Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, Spain.
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Jansen BA, Pérez JM, Pizarro A, Alonso C, Reedijk J, Navarro-Ranninger C. Sterically hindered cisplatin derivatives with multiple carboxylate auxiliary arms: synthesis and reactions with guanosine-5'-monophosphate and plasmid DNA. J Inorg Biochem 2001; 85:229-35. [PMID: 11410243 DOI: 10.1016/s0162-0134(01)00183-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [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: 11/30/2022]
Abstract
Two novel sterically hindered cisplatin derivatives with the ligand L=NH(2)C(CH(2)CH(2)COOH)(3) were prepared: cis-PtCl(2)L(2) and cis-PtCl(2)L(NH(3)). The starting compound for the syntheses was NH(2)C(CH(2)CH(2)COOtBu)(3), also known as a building block for dendrimers. cis-PtCl(2)L(2) was prepared from K(2)PtCl(4) in an unusual two-phase reaction in water-chloroform, followed by deprotection of the tert-butyl protective groups with formic acid to yield a water-soluble complex. The mixed-ligand compound cis-PtCl(2)L(NH(3)) was prepared from [PPh(4)][PtCl(3)(NH(3))] in methanol, with subsequent deprotection in formic acid. DNA-binding properties of the two compounds were investigated using the model base guanosine-5'-monophosphate (5'-GMP) and pBR322 plasmid DNA. While cisplatin [cis-PtCl(2)(NH(3))(2)] induced an unwinding of 12 degrees in pBR322 plasmid DNA, cis-PtCl(2)L(NH(3)) induced only 3 degrees unwinding, which is indicative of a monofunctional binding mode. Remarkably, cis-PtCl(2)L(2) did not induce any distortion in plasmid DNA, which strongly suggests that the compound does not bind to DNA. Test reactions with 5'-GMP, monitored by 1H and 195Pt NMR, confirmed that cis-PtCl(2)L(2) is unable to bind to DNA, whereas cis-PtCl(2)L(NH(3)) binds only one nucleotide. Apparently, binding of platinum to nucleotides at the coordination site cis with respect to the ligand L is prevented by steric crowding. Thus, cis-PtCl(2)L(NH(3)) must bind DNA monofunctionally at the trans position. Besides, both compounds have a chloride replaced by one of the carboxylate arms, forming a a seven-membered chelate ring. In theory, cis-PtCl(2)L(2) could also form a second chelate ring, but this was not observed.
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Affiliation(s)
- B A Jansen
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, NL-2300 RA Leiden, The Netherlands
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Robillard PY, Hulsey TC, Périanin J, Pérez JM, Gallais A, Janky E. Evaluation of neonatal sepsis screening in a tropical area Part III: Neonatal sepsis in meconium stained deliveries. W INDIAN MED J 2001; 50:130-2. [PMID: 11677909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
Of the 6,060 consecutive live births delivered at the University Maternity Unit of Guadeloupe (French West Indies) during a 30-month period, 635 newborns (10.4%) presented with meconium stained (MS) amniotic fluid, of which 595 (94%) received bacteriological screening at birth (light MS, n = 543; thick MS, n = 52). Thirty (5%) of MS newborns had a bacteraemia (n = 13, group B streptococcus, GBS), and 128 (21.5%) a bacterial positive gastric aspirate (n = 54, GBS). Sixty-six newborns among MS babies needed tracheal suctioning (11%) in the delivery room for meconium inhalation. Among these 595 screened MS newborns, 286 (48%) presented clinical signs of postmaturity at birth, having therefore an explanation for their MS condition. For the other MS newborns without the postmaturity explanation, we experienced twofold increased risk of neonatal sepsis (OR 1.88 for bacteraemia and 2.61 for external carriage p < 0.02, Chi square) as compared with their MS postmature counterparts. We conclude that when meconium stained deliveries are associated with postmaturity signs, one may not need to initiate prophylactic antibiotic treatment at birth unless they present with other traditional risk factors for neonatal sepsis such as intrapartum fever and prolonged rupture of membranes.
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Affiliation(s)
- P Y Robillard
- Centre Hospitalier Sud Réunion, BP 350, 97448 Saint-Pierre, La Réunioin, France
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