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Oberhauser W, Frediani M, Mohammadi Dehcheshmeh I, Evangelisti C, Poggini L, Capozzoli L, Najafi Moghadam P. Selective Alkyne Semi‐Hydrogenation by PdCu Nanoparticles Immobilized on Stereocomplexed Poly(lactic acid). ChemCatChem 2022. [DOI: 10.1002/cctc.202101910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Werner Oberhauser
- Istituto di Chimica dei Composti Organometallici (CNR-ICCOM) Via Madonna del Piano 10 50019 Sesto Fiorentino Italy
| | - Marco Frediani
- Department of Chemistry University of Florence Via della Lastruccia, 3–13 50019 Sesto Fiorentino Italy
| | - Iman Mohammadi Dehcheshmeh
- Department of Chemistry University of Florence Via della Lastruccia, 3–13 50019 Sesto Fiorentino Italy
- Department of Organic Chemistry Faculty of Chemistry Urmia University 57153-165 Urmia Iran
| | - Claudio Evangelisti
- Istituto di Chimica dei Composti Organometallici (CNR-ICCOM) U.O.S. di Pisa Via Moruzzi 1 56124 Pisa Italy
| | - Lorenzo Poggini
- Istituto di Chimica dei Composti Organometallici (CNR-ICCOM) Via Madonna del Piano 10 50019 Sesto Fiorentino Italy
| | - Laura Capozzoli
- Istituto di Chimica dei Composti Organometallici (CNR-ICCOM) Via Madonna del Piano 10 50019 Sesto Fiorentino Italy
| | - Peyman Najafi Moghadam
- Department of Organic Chemistry Faculty of Chemistry Urmia University 57153-165 Urmia Iran
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Dehcheshmeh IM, Moghadam PN, Marjani AP, Frediani M. Synthesis and Characterization of Eco-Friendly Waterborne Polyester-Urethane-Phosphorus Resin for Industrial Coil Coatings. Polym Sci Ser A 2021. [DOI: 10.1134/s0965545x21350030] [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: 11/23/2022]
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Bartoli M, Rosi L, Giovannelli A, Frediani P, Frediani M. Characterization of bio-oil and bio-char produced by low-temperature microwave-assisted pyrolysis of olive pruning residue using various absorbers. Waste Manag Res 2020; 38:213-225. [PMID: 31409255 DOI: 10.1177/0734242x19865342] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Olive pruning residue is largely formed during cultivation, and is usually disposed through open-air combustion directly in the field, but this habit is a possible source of pollution. The pyrolytic conversion of olive pruning residue has been run in a new and very appealing way using microwave as a heating source and different microwave absorbers in a multimode batch reactor. In this way, olive residue is converted into interesting bio-chemical products with a short pyrolysis time, ranging from 15 to 36 min, and with a peak temperature ranging from 450 K to 705 K according to the different microwave absorber. Thus, a very efficient and selective system was realized, which was able to address the process towards the formation of a large amount of bio-char (up to 61.2%) or a high formation of bio-oil (56.2%) and gas (41.7%) with a very low formation of bio-char (2.1%). However, when carbon and iron were used as microwave absorbers, it was possible to obtain an intermediate amount of bio-char (26-30%) and bio-oil (40 wt%). Bio-oils were collected as dark-brown liquids with low viscosity and density. A bio-oil with a low water concentration was obtained using carbon or iron as the microwave absorber. The bio-oils formed in all experiments contained a very large amount of acetic acid, even when NaOH was the microwave absorber. Furthermore, a large amount of aromatics were present in the bio-oil obtained using carbon as the microwave absorber.
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Affiliation(s)
| | - Luca Rosi
- Department of Chemistry, University of Florence, Italy
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Rosi L, Bartoli M, Frediani M. Microwave assisted pyrolysis of halogenated plastics recovered from waste computers. Waste Manag 2018; 73:511-522. [PMID: 28483368 DOI: 10.1016/j.wasman.2017.04.037] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Revised: 04/12/2017] [Accepted: 04/13/2017] [Indexed: 06/07/2023]
Abstract
Microwave Assisted Pyrolysis (MAP) of the plastic fraction of Waste from Electric and Electronic Equipment (WEEE) from end-life computers was run with different absorbers and set-ups in a multimode batch reactor. A large amount of various different liquid fractions (up to 76.6wt%) were formed together with a remarkable reduction of the solid residue (up to 14.2wt%). The liquid fractions were characterized using the following different techniques: FT-IR ATR, 1H NMR and a quantitative GC-MS analysis. The liquid fractions showed low density and viscosity, together with a high concentration of useful chemicals such as styrene (up to 117.7mg/mL), xylenes (up to 25.6mg/mL for p-xylene) whereas halogenated compounds were absent or present in a very low amounts.
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Affiliation(s)
- Luca Rosi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Florence, Italy; Consorzio Interuniversitario Reattività Chimica e Catalisi (CIRCC), Via Celso Ulpiani 27, Bari, Italy..
| | - Mattia Bartoli
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Florence, Italy
| | - Marco Frediani
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Florence, Italy; Consorzio Interuniversitario Reattività Chimica e Catalisi (CIRCC), Via Celso Ulpiani 27, Bari, Italy
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Salvadori B, Cagnini A, Galeotti M, Porcinai S, Goidanich S, Vicenzo A, Celi C, Frediani P, Rosi L, Frediani M, Giuntoli G, Brambilla L, Beltrami R, Trasatti S. Traditional and innovative protective coatings for outdoor bronze: Application and performance comparison. J Appl Polym Sci 2017. [DOI: 10.1002/app.46011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Barbara Salvadori
- Institute for the Conservation and Valorization of Cultural Heritage, National Research Council; Via Madonna del Piano 10, Sesto Fiorentino I-50019 Italy
| | - Andrea Cagnini
- Opificio delle Pietre Dure; Via degli Alfani, 78, Florence I-50121 Italy
| | - Monica Galeotti
- Institute for the Conservation and Valorization of Cultural Heritage, National Research Council; Via Madonna del Piano 10, Sesto Fiorentino I-50019 Italy
- Opificio delle Pietre Dure; Via degli Alfani, 78, Florence I-50121 Italy
| | - Simone Porcinai
- Opificio delle Pietre Dure; Via degli Alfani, 78, Florence I-50121 Italy
| | - Sara Goidanich
- Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”; Politecnico di Milano; Piazza Leonardo da Vinci 32, Milano I-20133 Italy
| | - Antonello Vicenzo
- Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”; Politecnico di Milano; Piazza Leonardo da Vinci 32, Milano I-20133 Italy
| | - Claudio Celi
- Opificio delle Pietre Dure; Via degli Alfani, 78, Florence I-50121 Italy
| | - Piero Frediani
- Department of Chemistry “Ugo Schiff”; University of Florence; via della Lastruccia 3-13, Sesto Fiorentino (FI) I-50019 Italy
| | - Luca Rosi
- Department of Chemistry “Ugo Schiff”; University of Florence; via della Lastruccia 3-13, Sesto Fiorentino (FI) I-50019 Italy
| | - Marco Frediani
- Department of Chemistry “Ugo Schiff”; University of Florence; via della Lastruccia 3-13, Sesto Fiorentino (FI) I-50019 Italy
| | - Giulia Giuntoli
- Department of Chemistry “Ugo Schiff”; University of Florence; via della Lastruccia 3-13, Sesto Fiorentino (FI) I-50019 Italy
| | - Laura Brambilla
- Haute-Ecole Arc Conservation-Restauration, Espace de l'Europe 11; Neuchâtel 2000 Switzerland
| | - Ruben Beltrami
- Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”; Politecnico di Milano; Piazza Leonardo da Vinci 32, Milano I-20133 Italy
| | - Stefano Trasatti
- Department of Chemistry; University of Milan; Via Camillo Golgi 19, Milan I-20133 Italy
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Frediani M, Oberhauser W, Rosi L, Bartoli M, Passaglia E, Capozzoli L. Palladium nanoparticles supported onto stereocomplexed poly(lactic acid)-poly(ε-caprolactone) copolymers for selective partial hydrogenation of phenylacetylene. Rend Fis Acc Lincei 2017. [DOI: 10.1007/s12210-017-0600-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/08/2023]
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Pedna A, Rosi L, Frediani M, Frediani P. Aromatic triblock polymers from natural sources as protective coatings for stone surfaces. J Appl Polym Sci 2016. [DOI: 10.1002/app.43377] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Andrea Pedna
- Department of Chemistry; University of Florence; Sesto Fiorentino 50019 Italy
| | - Luca Rosi
- Department of Chemistry; University of Florence; Sesto Fiorentino 50019 Italy
| | - Marco Frediani
- Department of Chemistry; University of Florence; Sesto Fiorentino 50019 Italy
| | - Piero Frediani
- Department of Chemistry; University of Florence; Sesto Fiorentino 50019 Italy
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Bartoli M, Rosi L, Frediani M, Frediani P. Protocol: A simple protocol for quantitative analysis of bio-oils through gas- chromatography/mass spectrometry. Eur J Mass Spectrom (Chichester) 2016; 22:199-212. [PMID: 27882885 DOI: 10.1255/ejms.1432] [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: 06/06/2023]
Abstract
A new and simple protocol for quantitative analysis of bio-oils using gas-chromatography/mass spectrometry is suggested. Compounds were identified via their mass spectra, and then unavailable response factors were calculated with respect to diphenyl as the internal standard using a modified method previously suggested for gas chromatography with flame ionization detection. This new protocol was applied to the characterization of bio-oils obtained from the pyrolysis of woods of different sources or using different pyrolysis procedures. This protocol allowed evaluation of the yields of products from poplar pyrolysis (among 50% and 99%), while a reduced amounts of products were identified from the pyrolysis of cellulose (between 46% and 58%). The main product was always acetic acid, but it was formed in very large yields from poplar while lower yields were obtained from cellulose.
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Affiliation(s)
- Mattia Bartoli
- Department of Chemistry 'Ugo Schiff', University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Florence, Italy
| | - Luca Rosi
- Department of Chemistry 'Ugo Schiff', University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Florence, Italy
| | - Marco Frediani
- Department of Chemistry 'Ugo Schiff', University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Florence, Italy
| | - Piero Frediani
- Department of Chemistry 'Ugo Schiff', University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Florence, Italy.
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Rosi L, Bartoli M, Undri A, Frediani M, Frediani P. Synthesis of dianols or BPA through catalytic hydrolyisis/glycolysis of waste polycarbonates using a microwave heating. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.molcata.2015.07.027] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Oberhauser W, Evangelisti C, Jumde RP, Petrucci G, Bartoli M, Frediani M, Mannini M, Capozzoli L, Passaglia E, Rosi L. Palladium-nanoparticles on end-functionalized poly(lactic acid)-based stereocomplexes for the chemoselective cinnamaldehyde hydrogenation: Effect of the end-group. J Catal 2015. [DOI: 10.1016/j.jcat.2015.07.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Bartoli M, Rosi L, Petrucci G, Armelao L, Oberhauser W, Frediani M, Piccolo O, Rathod VD, Paganelli S. An easily recoverable and recyclable homogeneous polyester-based Pd catalytic system for the hydrogenation of α,β-unsaturated carbonyl compounds. CATAL COMMUN 2015. [DOI: 10.1016/j.catcom.2015.07.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Affiliation(s)
- Andrea Pedna
- Department of Chemistry; University of Florence; via della Lastruccia 3-13 50019 Sesto Fiorentino Italy
- Department of Chemistry and Industrial Chemistry; University of Pisa; via Risorgimento 35 56126 Pisa Italy
| | - Luca Rosi
- Department of Chemistry; University of Florence; via della Lastruccia 3-13 50019 Sesto Fiorentino Italy
| | - Marco Frediani
- Department of Chemistry; University of Florence; via della Lastruccia 3-13 50019 Sesto Fiorentino Italy
| | - Piero Frediani
- Department of Chemistry; University of Florence; via della Lastruccia 3-13 50019 Sesto Fiorentino Italy
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Pratesi A, Ginanneschi M, Melani F, Chinol M, Carollo A, Paganelli G, Lumini M, Bartoli M, Frediani M, Rosi L, Petrucci G, Messori L, Papini AM. Design and solid phase synthesis of new DOTA conjugated (+)-biotin dimers planned to develop molecular weight-tuned avidin oligomers. Org Biomol Chem 2015; 13:3988-4001. [DOI: 10.1039/c4ob02685c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [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
Oligomeric architectures of avidin generated by a new class of bis-biotins.
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Rocco M, Molteni M, Ponassi M, Giachi G, Frediani M, Koutsioubas A, Profumo A, Trevarin D, Cardinali B, Vachette P, Ferri F, Pérez J. A comprehensive mechanism of fibrin network formation involving early branching and delayed single- to double-strand transition from coupled time-resolved X-ray/light-scattering detection. J Am Chem Soc 2014; 136:5376-84. [PMID: 24654923 DOI: 10.1021/ja5002955] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The formation of a fibrin network following fibrinogen enzymatic activation is the central event in blood coagulation and has important biomedical and biotechnological implications. A non-covalent polymerization reaction between macromolecular monomers, it consists basically of two complementary processes: elongation/branching generates an interconnected 3D scaffold of relatively thin fibrils, and cooperative lateral aggregation thickens them more than 10-fold. We have studied the early stages up to the gel point by fast fibrinogen:enzyme mixing experiments using simultaneous small-angle X-ray scattering and wide-angle, multi-angle light scattering detection. The coupled evolutions of the average molecular weight, size, and cross section of the solutes during the fibrils growth phase were thus recovered. They reveal that extended structures, thinner than those predicted by the classic half-staggered, double-stranded mechanism, must quickly form. Following extensive modeling, an initial phase is proposed in which single-bonded "Y-ladder" polymers rapidly elongate before undergoing a delayed transition to the double-stranded fibrils. Consistent with the data, this alternative mechanism can intrinsically generate frequent, random branching points in each growing fibril. The model predicts that, as a consequence, some branches in these expanding "lumps" eventually interconnect, forming the pervasive 3D network. While still growing, other branches will then undergo a Ca(2+)/length-dependent cooperative collapse on the resulting network scaffolding filaments, explaining their sudden thickening, low final density, and basic mechanical properties.
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Affiliation(s)
- Mattia Rocco
- Biopolimeri e Proteomica, IRCCS AOU San Martino-IST , I-16132 Genova, Italy
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Giachi G, Frediani M, Oberhauser W, Lamaty F, Martinez J, Colacino E. Ultrasounds in melted poly(ethylene glycol) promote copper-catalyzed cyanation of aryl halides with K(4)[Fe(CN)(6)]. ChemSusChem 2014; 7:919-924. [PMID: 24678012 DOI: 10.1002/cssc.201300997] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Revised: 12/02/2013] [Indexed: 06/03/2023]
Abstract
Melted poly(ethylene glycols) (PEGs) were used for the first time as solvent for the sonochemically promoted cyanation of aryl halides employing inexpensive and safe K4[Fe(CN)6] and a relatively low amount of Cu-based catalyst. The Mw (weight-average polymer molecular weight) of PEG proved to notably influence the substrate conversion, which is indicative of a strong dependence of the sonication efficacy on solvent properties. Gel permeation chromatography (GPC), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) contributed to the characterization of the polymer and the elucidation of the catalytic system.
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Ruffini Castiglione M, Gelati MT, Cremonini R, Frediani M. The intergenic spacer region of the rDNA in Haplopappus gracilis (Nutt.) Gray. Protoplasma 2013; 250:683-689. [PMID: 22948831 DOI: 10.1007/s00709-012-0441-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2012] [Accepted: 07/24/2012] [Indexed: 06/01/2023]
Abstract
In this paper, we provide further information on the genome organisation of Haplopappus gracilis, one of the six angiosperms showing the lowest chromosome number, i.e. 2n = 4, by determining the nucleotide sequence of the intergenic spacer region of the ribosomal RNA genes and its cytological localization on metaphase chromosomes. DNA sequence analysis reveals the occurring of a product of 4,382 bp in length, characterised by the presence of four blocks of different repeated sequences. Our analysis also evidenced putative promoter regions with three transcription initiation sites for polymerase I, as previously reported in Artemisia absinthium, belonging to the same Asteraceae family. A fluorescent in situ hybridization with the intergenic spacer probe indicates the presence of rDNA genes only in the satellited chromosomes of H. gracilis; besides, differences in the signal intensity between homologous chromosomes were frequently observed, thus suggesting for these chromosome sites the presence of a variable number of rDNA gene copies, even if a divergent chromatin organisation in corresponding regions cannot be ruled out.
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MESH Headings
- Base Sequence
- Chromosome Mapping
- Chromosomes, Plant
- DNA, Ribosomal Spacer/genetics
- Genes, Plant
- Haplopappus/genetics
- Molecular Sequence Annotation
- Molecular Sequence Data
- Promoter Regions, Genetic
- RNA, Ribosomal/genetics
- RNA, Ribosomal, 18S/genetics
- RNA, Ribosomal, 5.8S/genetics
- Sequence Analysis, DNA
- Transcription Initiation Site
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Giachi G, Oberhauser W, Frediani M, Passaglia E, Capozzoli L, Rosi L. Pd‐nanoparticles stabilized by pyridine‐functionalized poly(ethylene glycol) as catalyst for the aerobic oxidation of α,β‐unsaturated alcohols in water. ACTA ACUST UNITED AC 2013. [DOI: 10.1002/pola.26645] [Citation(s) in RCA: 14] [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: 11/07/2022]
Affiliation(s)
- Guido Giachi
- Dipartimento di ChimicaUniversità di Firenze, via della Lastruccia 1350019Sesto Fiorentino Firenze Italy
| | - Werner Oberhauser
- Istituto di Chimica dei Composti Organometallici (ICCOM‐CNR), Area di Ricerca CNR di Firenzevia Madonna del Piano 1050019Sesto Fiorentino Italy
| | - Marco Frediani
- Dipartimento di ChimicaUniversità di Firenze, via della Lastruccia 1350019Sesto Fiorentino Firenze Italy
| | - Elisa Passaglia
- ICCOM‐CNR, UOS Pisa, Area della Ricercavia Moruzzi 156124Pisa Italy
| | - Laura Capozzoli
- Centro di Microscopie Elettroniche (Ce.M.E.), Area di Ricerca CNR di Firenze, via Madonna del Piano 1050019Sesto Fiorentino Italy
| | - Luca Rosi
- Dipartimento di ChimicaUniversità di Firenze, via della Lastruccia 1350019Sesto Fiorentino Firenze Italy
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Bertini P, Frediani M, Roncucci P. Ultrasound guided cephalic vein cannulation (in the deltopectoral triangle) in severe hypoxemic non-invasive ventilated patient. Minerva Anestesiol 2012; 78:1311-1312. [PMID: 22475808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
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Blanco A, Simeone R, Resta P, Pace CD, Delre V, Caccia R, Mugnozza GT, Frediani M, Cremonini R, Cionini PG. Genomic relationships between Dasypyrum villosum (L.) Candargy and D. hordeaceum (Cosson et Durieu) Candargy. Genome 2012; 39:83-92. [PMID: 18469881 DOI: 10.1139/g96-012] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The origin and genomic constitution of the tetraploid perennial species Dasypyrum hordeaceum (2n = 4x = 28) and its phylogenetic relationships with the annual diploid Dasypyrum villosum (2n = 2x = 14) have been investigated by comparing the two genomes using different methods. There is no apparent homology between the conventional or Giemsa C-banded karyotypes of the two Dasypyrum species, nor can the karyotype of D. hordeaceum be split up into two similar sets. Polymorphism within several chromosome pairs was observed in both karyotypes. Cytophotometric determinations of the Feulgen-DNA absorptions showed that the genome size of D. hordeaceum was twice as large as that of D. villosum. Both the cross D. villosum x D. hordeaceum (crossability rate 12.1%) and the reciprocal cross (crossability rate 50.7%) produced plump seeds. Only those from the former cross germinated, producing sterile plants with a phenotype that was intermediate between those of the parents. In these hybrids (2n = 21), an average of 13.77 chromosomes per cell paired at meiotic metaphase I. Trivalents were only rarely observed. Through dot-blot hybridizations, a highly repeated DNA sequence of D. villosum was found not to be represented in the genome of D. hordeaceum. By contrast, very similar restriction patterns were observed when a low-repeated DNA sequence or different single-copy sequences of D. villosum or two sequences in the plastidial DNA of rice were hybridized to Southern blots of the genomic DNAs of the two Dasypyrum species digested with different restriction endonucleases. By analyzing glutamic-oxaloacetic-transaminase, superoxide dismutase, alcohol dehydrogenase, and esterase isozyme systems, it was shown that both Dasypyrum species shared the same phenotypes, which differed from those found in hexaploid wheat. In situ hybridizations using DNA sequences encoding gliadins showed that these genes were located close to the centromere of three pairs of D. villosum chromosomes and that they had the same locations in six pairs of D. hordeaceum chromosomes. We conclude that the autoploid origin of D. hordeaceum from D. villosum, which cannot be defended on the basis of chromosomal traits, is suggested by the other findings obtained by comparing the two genomes. Key words : Dasypyrum hordeaceum, Dasypyrum villosum, phylogenetic relationships.
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Galasso I, Pignone D, Frediani M, Maggiani M, Cremonini R. Chromatin characterization by banding techniques, in situ hybridization, and nuclear DNA content in Cicer L. (Leguminosae). Genome 2012; 39:258-65. [PMID: 18469891 DOI: 10.1139/g96-035] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The karyotypes of three accessions, one each from three annual species of the genus Cicer, namely Cicer arietinum, Cicer reticulation, and Cicer echinospermum, were examined and compared using C-banding, the fluorochromes chromomycin A3, DAPI, and Hoechst 33258, in situ hybridization of the 18S-5.8S-25S and 5S rDNA sequences, and silver staining. The nuclear DNA content of the three species and the amount of heterochromatin were also determined. The results suggest an evolutionary pathway in which C. reticulatum is the ancestral species from which both C. arietinum and C. echinospermum are derived with the loss of one pair of satellites; subsequently, C. echinospermum further differentiated by the accumulation of chromosomal rearrangement(s) that gave rise to a hybrid sterility barrier. Key words : Cicer, C-banding, fluorochromes, Ag staining, rRNA genes.
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Ruffini Castiglione M, Frediani M, Gelati MT, Venora G, Giorgetti L, Caputo P, Cremonini R. Cytological and molecular characterization of Vicia barbazitae Ten. & Guss. Protoplasma 2012; 249:779-788. [PMID: 21969240 DOI: 10.1007/s00709-011-0323-0] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2011] [Accepted: 09/22/2011] [Indexed: 05/31/2023]
Abstract
Vicia barbazitae, a taxon belonging to section Vicia of subgenus Vicia, was recovered and analysed by cytological, karyological and molecular methods with the aim of both proposing a general characterisation of this species and studying the relationships among the species of section Vicia . Phylogenetic relationships among the species of the section Vicia and those of the sections Microcarinae, Wiggersia and Atossa were also analysed. Automated karyotype analysis has been determined after Feulgen's reaction; chromosome banding was performed by sequence-specific fluorochrome staining. Fluorescent chromosome banding showed CMA(+)/DAPI(-) NOR-associated heterochromatin in the satellite pair. Karyomorphological parameters, based on symmetry indices, the dendrogram of linkage distance constructed on 37 chromosome parameters, as well as the molecular data based on internal transcribed spacer sequences provided information about phylogenetic position of this species inside the section Vicia and among the species belonging to the sections Microcarinae, Wiggersia, Atossa and Vicia. From our karyological and molecular results, it emerges that V. barbazitae can be considered a natural member of section Vicia.
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Bertini P, Frediani M, Roncucci P. Ultrasound guided phrenic nerve block in the treatment of persistent hiccups (singultus) in the neurosurgical critical patient. Minerva Anestesiol 2012; 78:856-857. [PMID: 22310201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
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Giuntoli G, Rosi L, Frediani M, Sacchi B, Frediani P. Fluoro-functionalized PLA polymers as potential water-repellent coating materials for protection of stone. J Appl Polym Sci 2012. [DOI: 10.1002/app.36469] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Ruffini Castiglione M, Frediani M, Gelati MT, Ravalli C, Venora G, Caputo P, Cremonini R. Cytology of Vicia species. X. Karyotype evolution and phylogenetic implication in Vicia species of the sections Atossa, Microcarinae, Wiggersia and Vicia. Protoplasma 2011; 248:707-716. [PMID: 21057828 DOI: 10.1007/s00709-010-0232-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2010] [Accepted: 10/21/2010] [Indexed: 05/30/2023]
Abstract
Automated karyotype analyses and sequence of rDNA spacers have been analysed for the species belonging to sections Atossa, Microcarinae, Wiggersia and Vicia. Karyomorphological parameters, based on Rec, Syi and TF% indices, have been determined and evidenced that, in term of symmetry, the karyotype of Vicia lathyroides was the most asymmetric one. A multivariate analysis using 34 karyological parameters, in addition to the symmetry indices, has been carried out and the corresponding dendrogram of linkage distances showed six different groups. Molecular investigations on the inclusive group in study by employing ITS DNA sequences indicated a different pattern of relationships. The cladistic analysis combining the molecular data set with karyological parameters evidenced that the species of sections Vicia and Atossa join closely to each other in a paraphyletic group, which includes the monophyletic section Wiggersia. Therefore, our karyological and molecular data provide information about the phylogenetic position of the analysed species inside the subgenus Vicia and are discussed in relation to previous results obtained by morphology, isozymes and ribosomal genes analyses.
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Penco M, Spagnoli G, Peroni I, Rahman MA, Frediani M, Oberhauser W, Lazzeri A. Effect of nucleating agents on the molar mass distribution and its correlation with the isothermal crystallization behavior of poly(L-lactic acid). J Appl Polym Sci 2011. [DOI: 10.1002/app.34761] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [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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Abstract
L,L-Lactide, a dimer of L-lactic acid, is the typical monomer used for the catalytic synthesis of poly(L-lactic acid) (PLLA). We studied its phase diagram and reactivity at high pressure and high temperature by means of a diamond anvil cell. FTIR and Raman spectroscopy were employed to probe the changes occurring in the sample. An increase of temperature at pressure higher than 0.1 GPa revealed a solid-solid phase transition before the melting. A reaction was observed immediately after the melting with the almost complete transformation of the starting reactant to an amorphous poly(lactic acid) (PLA). The increase of pressure was found to accelerate the process, suggesting the reaction rate to be limited in the diffusion step. A steeper acceleration, likely due to multiphoton absorption processes of the 647.1 nm laser light by PLA, was observed in the Raman experiments.
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Affiliation(s)
- Matteo Ceppatelli
- LENS, European Laboratory for Nonlinear Spectroscopy, Via Nello Carrara 1, 50019 Sesto Fiorentino (FI), Italy.
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Frediani M, Rosi L, Camaiti M, Berti D, Mariotti A, Comucci A, Vannucci C, Malesci I. Polylactide/Perfluoropolyether Block Copolymers: Potential Candidates for Protective and Surface Modifiers. MACROMOL CHEM PHYS 2010. [DOI: 10.1002/macp.201000034] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Ruffini Castiglione M, Frediani M, Ravalli C, Venora G, Cremonini R. Cytological characterization of Vicia oroboides Wulfen in Jacq. Protoplasma 2009; 236:21-27. [PMID: 19424774 DOI: 10.1007/s00709-009-0047-6] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2009] [Accepted: 04/27/2009] [Indexed: 05/27/2023]
Abstract
Vicia oroboides, a rare taxon belonging to section Atossa of subgenus Vicia, was recovered and analysed by means of cytological and karyological methods with the aim of both characterising this species and integrating our knowledge on phylogeny of subgenus Vicia. Automated karyotype analysis and nuclear DNA content have been determined after Feulgen's reaction; chromosome banding was performed by fluorochrome staining to evidence heterochromatic blocks along the chromosome complement. The chromosome number is in line with the values of the species of section Atossa; the GC- and AT-rich sites were identified by CMA and DAPI staining. Karyomorphological parameters, based on symmetry indices, provide information about the phylogenetic position of this species inside the subgenus Vicia. DNA content is reported for the first time.
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Frediani M, Sémeril D, Mariotti A, Rosi L, Frediani P, Rosi L, Matt D, Toupet L. Ring Opening Polymerization of Lactide under Solvent-Free Conditions Catalyzed by a Chlorotitanium Calix[4]arene Complex. Macromol Rapid Commun 2008. [DOI: 10.1002/marc.200800383] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Ruffini Castiglione M, Frediani M, Venora G, Cremonini R. Cytological investigation of Haplopappus gracilis (Nutt.) Gray: 5-methylcytosine-rich regions, fluorochrome banding and chromatin sensitivity to DNase I digestion. Protoplasma 2008; 233:107-113. [PMID: 18615238 DOI: 10.1007/s00709-008-0296-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2007] [Accepted: 10/21/2007] [Indexed: 05/26/2023]
Abstract
Haplopappus gracilis (Nutt.) Gray, one of the five known higher plants with a chromosome number of 2n = 4, was studied from a cytological point of view. The chromosome complement of this species was characterized by means of automated karyotype analysis. Moreover, the DNA methylation pattern and fluorochrome banding were determined and compared with cytological data present in the literature. DNA methylation distribution along metaphase chromosomes involved all chromosome territories evidenced by C-banding. Other methylated bands correlated positively with aceto-orcein-positive heterochromatic portions and/or with late replicating bands and/or fluorochrome bands. Some methylated bands showed differences between homologous chromosomes. These bands belonged partly to certain heterochromatic domains and partly to intercalary sites not defined by other standard banding techniques. Differences between the homologues were also indicated by our DNA content data obtained after DNase I digestion.
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Bianchini C, Giambastiani G, Meli A, Rios IG, Toti A, Passaglia E, Frediani M. LLDPE with Exclusively Ethyl Branches by Tandem Catalysis with Single-Site Zr(IV)/Co(II) Catalysts. Top Catal 2008. [DOI: 10.1007/s11244-008-9053-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Frediani P, Mariani P, Rosi L, Frediani M, Comucci A. One-pot syntheses of alcohols from olefins through Co/Ru tandem catalysis. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.molcata.2007.02.030] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Sarri V, Baldoni L, Porceddu A, Cultrera NGM, Contento A, Frediani M, Belaj A, Trujillo I, Cionini PG. Microsatellite markers are powerful tools for discriminating among olive cultivars and assigning them to geographically defined populations. Genome 2007; 49:1606-15. [PMID: 17426775 DOI: 10.1139/g06-126] [Citation(s) in RCA: 98] [Impact Index Per Article: 5.8] [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
Twelve simple sequence repeat (SSR) loci were used to differentiate among 118 cultivars sampled in several countries of the Mediterranean basin and to analyze the genetic structure of olive cultivar gene pools. The markers were found to have high discrimination power. On average, with a single assay it was possible to discriminate 96% of the pairwise comparisons and, with a combination of 3 loci, virtually all cultivars were distinguished. The SSR markers were also tested for their ability to assign cultivars to their geographic population of origin. A selection of 6 loci was found to maximize assignment accuracy, correctly reallocating up to 75.4% of cultivars to their population of origin. Because of the confusion surrounding the origin of most olive cultivars, their molecular identification and ascertainment of origin will be extremely useful for germplasm management and breeding.
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Affiliation(s)
- V Sarri
- Dipartimento di Biologia Cellulare e Ambientale, Sezione di Biologia Cellulare e Molecolare, Università di Perugia, Via Elce di Sotto, 06123 Perugia, Italy
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Frediani P, Rosi L, Frediani M, Bartolucci G, Bambagiotti-Alberti M. A convenient route to the synthesis of isotopomeric dihydro-2(3H)furanones. J Agric Food Chem 2007; 55:3877-83. [PMID: 17447794 DOI: 10.1021/jf070305y] [Citation(s) in RCA: 6] [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] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
A general synthetic procedure leading to isotopomeric dihydro-2(3H)furanones (gamma-butyrolactones) containing two, four, or six deuterium atoms has been developed. The labeled dihydro-2(3H)furanones were synthesized in quantitative yield from the saturated diacid C4 (succinic) or unsaturated diacids C4 (fumaric, maleic, or acetylendicarboxylic) in the presence of Ru4H4(CO)8(PBu3)4 using a deuterium pressure of 180 bar at 180 degrees C. This methodology was applied to the total synthesis of a hexadeuterated matairesinol lignan: The 3,4-bis[[3-methoxy-4-(phenylmethoxy)phenyl]methyl]dihydro-2(3H)furanone-[7,7',8,8',9',9'-D6] (benzyl-protected matairesinol-D6) was fully characterized.
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Affiliation(s)
- Piero Frediani
- Department of Organic Chemistry, University of Florence, Sesto, Italy.
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Frediani M, Sémeril D, Comucci A, Bettucci L, Frediani P, Rosi L, Matt D, Toupet L, Kaminsky W. Macromol. Chem. Phys. 9/2007. MACROMOL CHEM PHYS 2007. [DOI: 10.1002/macp.200790018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Frediani M, Sémeril D, Comucci A, Bettucci L, Frediani P, Rosi L, Matt D, Toupet L, Kaminsky W. Ultrahigh-Molecular-Weight Polyethylene by Using a Titanium Calix[4]arene Complex with High Thermal Stability under Polymerization Conditions. MACROMOL CHEM PHYS 2007. [DOI: 10.1002/macp.200700075] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [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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Ruffini Castiglione M, Frediani M, Gelati MT, Ravalli C, Venora G, Caputo P, Cremonini R. Cytological and molecular characterization of Vicia esdraelonensis Warb. & Eig: a rare taxon. Protoplasma 2007; 231:151-9. [PMID: 17762909 DOI: 10.1007/s00709-007-0256-9] [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] [Subscribe] [Scholar Register] [Received: 10/18/2006] [Accepted: 12/16/2006] [Indexed: 05/17/2023]
Abstract
Vicia esdraelonensis, a rare taxon belonging to section Hypechusa of subgenus Vicia, was recovered and analyzed by cytological, karyological, and molecular methods, with the aim of both characterizing this species and furthering our knowledge of the phylogeny of subgenus Vicia. Automated karyotype analysis, nuclear DNA content, and chromatin organization were determined by the Feulgen reaction, as well as chromosome banding after double staining with 4',6-diamidino-2-phenylindole (DAPI) and chromomycin A3. The chromosome number and the nuclear DNA content were in agreement with the values of the species of section Hypechusa. The GC- and AT-rich preferential sites were determined by chromomycin A3 and DAPI staining. Karyomorphological parameters indicated that V. esdraelonensis is in an intermediate position in the spatial representation of the species of section Hypechusa on the basis of symmetry indices, as well as in the dendrogram of linkage distance constructed on 37 chromosome parameters. Molecular data based on internal transcribed spacer sequences show that V. esdraelonensis can doubtlessly be included in section Hypechusa and document its closeness to V. noeana. A cladistic analysis combining the molecular data set with karyological characters is also reported. Karyological, cytological, and molecular data allow characterization of the V. esdraelonensis genome and provide information about the phylogenetic position of this species within the Hyrcanicae series of section Hypechusa.
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Miller HA, Moneti S, Vizza F, Passaglia E, Bianchini C, Bronco S, Ceriegi S, Sulcis R, Frediani M, Ciardelli F, Costa G. Polyketone Nanocomposites by Palladium-Catalyzed Ethylene-Carbon Monoxide-(Propene) Co(Ter)polymerization Inside an Unmodified Layered Silicate. e-Polymers 2006. [DOI: 10.1515/epoly.2006.6.1.29] [Citation(s) in RCA: 2] [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: 11/15/2022]
Abstract
AbstractComposites from Na-montmorillonite with a content in inorganic material ranging from 3 to 98 wt % were prepared in situ either by copolymerization of ethylene and CO or by terpolymerization of ethylene, propene and CO using a palladium(II) catalyst modified with 1,3-bis(diphenylphosphino)propane. This catalytic system is active in polar media and allowed to produce nanocomposites starting from unmodified Na-montmorillonite in water-methanol solutions. The morphological analysis, performed on samples with less than 40 wt % silicate by XRD and TEM, showed the formation of either intercalated or exfoliated (nanocomposite) structures, depending on the initial amount of the layered silicate in the reactor as well as the presence of propene as comonomer. Improved thermal stability of the hybrid materials, as compared to the corresponding organic polymers, was shown by TGA. A preliminary study of the blending of some polyketone nanocomposites with polyamide (nylon-6) was carried out by melt mixing at high temperature in a Brabender mixer.
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Affiliation(s)
- Hamish A. Miller
- 1ICCOM-CNR, Area di Ricerca CNR di Firenze, via Madonna del Piano 10, Sesto Fiorentino (Firenze) Italy fax: +390555225203
| | - Simonetta Moneti
- 1ICCOM-CNR, Area di Ricerca CNR di Firenze, via Madonna del Piano 10, Sesto Fiorentino (Firenze) Italy fax: +390555225203
| | - Francesco Vizza
- 1ICCOM-CNR, Area di Ricerca CNR di Firenze, via Madonna del Piano 10, Sesto Fiorentino (Firenze) Italy fax: +390555225203
| | - Elisa Passaglia
- 2ICCOM-CNR, Pisa Section, via Risorgimento 35, Pisa, Italy; fax:+390502219320
| | - Claudio Bianchini
- 1ICCOM-CNR, Area di Ricerca CNR di Firenze, via Madonna del Piano 10, Sesto Fiorentino (Firenze) Italy fax: +390555225203
| | - Simona Bronco
- 3PolyLab-INFM, Pisa, via Risorgimento 35, Pisa, Italy
| | - Silvia Ceriegi
- 4Dipartimento di Chimica e Chimica Industriale, Universita di Pisa, via Risorgimento 35, Pisa, Italy
| | - Roberta Sulcis
- 5Scuola Normale Superiore, Piazza dei Cavalieri 7, Pisa, Italy
| | - Marco Frediani
- 6Dipartimento di Chimica, Universita degli Studi di Firenze, Polo Scientifico, via della Lastruccia 13, 50019 Sesto Fiorentino, Italy
| | - Francesco Ciardelli
- 2ICCOM-CNR, Pisa Section, via Risorgimento 35, Pisa, Italy; fax:+390502219320
- 3PolyLab-INFM, Pisa, via Risorgimento 35, Pisa, Italy
| | - Giovanna Costa
- 7ISMAC-CNR, Genova Section, Area della Ricerca di Genova, Via E. De Marini, 6, Genova, Italy
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Caputo P, Frediani M, Venora G, Ravalli C, Ambrosio M, Cremonini R. Nuclear DNA contents, rDNAs, and karyotype evolution in subgenus Vicia: III. The heterogeneous section Hypechusa. Protoplasma 2006; 228:167-77. [PMID: 16838079 DOI: 10.1007/s00709-006-0158-2] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2005] [Accepted: 09/29/2005] [Indexed: 05/10/2023]
Abstract
Nuclear DNA contents, automated karyotype analyses, and sequences of internal transcribed spacers from ribosomal genes have been determined in the species belonging to section Hypechusa of the subgenus Vicia. Karyomorphological results and phylogenetic data generated from the comparison of rDNA (genes coding for rRNA) sequences showed that sect. Hypechusa is not monophyletic; however, some monophyletic units are apparent (one including Vicia galeata, V. hyrcanica, V. noeana, and V. tigridis, another including V. assyriaca, V. hybrida, V. melanops, V. mollis, and V. sericocarpa), which partly correspond to morphology-based infrasectional groups. The relationships among these species and the species in sections Faba, Narbonensis, Bithynicae, and Peregrinae have been also investigated.
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Affiliation(s)
- P Caputo
- Sezione di Biologia Vegetale, Dipartimento delle Scienze Biologiche, Università di Napoli Federico II, Naples, Italy
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Frediani M, Bianchini C, Kaminsky W. Low density polyethylene by tandem catalysis with single site Ti(IV)/Co(II) catalysts. Kinet Catal 2006. [DOI: 10.1134/s002315840602008x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Frediani M, Caputo P, Venora G, Ravalli C, Ambrosio M, Cremonini R. Nuclear DNA contents, rDNAs, and karyotype evolution in Vicia subgenus Vicia: II. Section Peregrinae. Protoplasma 2005; 226:181-90. [PMID: 16244807 DOI: 10.1007/s00709-005-0114-6] [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] [Subscribe] [Scholar Register] [Received: 11/09/2004] [Accepted: 02/09/2005] [Indexed: 05/05/2023]
Abstract
Nuclear DNA contents, automated karyotype analyses, and sequences of rDNA spacers have been determined for the species of Vicia belonging to sect. Peregrinae, as well as for V. mollis. The phylogenetic data generated from the comparison of rDNA sequences and karyomorphological results would both indicate that Vicia mollis is a sister group to sect. Peregrinae. The relationships among the species belonging to the Peregrinae section and species enclosed in sections Faba, Narbonensis, and Bithynicae have been also investigated: a clade including V. mollis and sect. Peregrinae is a sister group to a clade including V. bithynica and sect. Narbonensis. With our choice of outgroup, Vicia faba (including subsp. paucijuga) is external to the above mentioned inclusive group.
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Affiliation(s)
- M Frediani
- Dipartimento di Agrobiologia ed Agrochimica, Università della Tuscia, via Sam Camillo de Lellis, 01100 Viterbo, Italy.
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Bianchini C, Frediani M, Giambastiani G, Kaminsky W, Meli A, Passaglia E. Amorphous Polyethylene by Tandem Action of Cobalt and Titanium Single-Site Catalysts. Macromol Rapid Commun 2005. [DOI: 10.1002/marc.200500243] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Frediani M, Kaminsky W. Propene Polymerisation withrac-[Me2Si(2-Me-4-(α-naphthyl)-1-Ind)2]ZrCl2 as a Highly Active Catalyst: Influence of Monomer Concentration, Polymerisation Temperature and a Heterogenising Support. MACROMOL CHEM PHYS 2003. [DOI: 10.1002/macp.200350062] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Ceccarelli M, Esposto C, Roscini C, Sarri V, Frediani M, Gelati T, Cavallini A, Giordani T, Pellegrino M, Cionini G. Genome plasticity in Festuca arundinacea: direct response to temperature changes by redundancy modulation of interspersed DNA repeats. Theor Appl Genet 2002; 104:901-907. [PMID: 12582594 DOI: 10.1007/s00122-001-0862-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2001] [Accepted: 11/26/2001] [Indexed: 05/24/2023]
Abstract
The response of the genome of Festuca arundinacea seedlings to changes in the temperature at which they were grown was investigated. Fifteen repeated sequences in the nuclear DNA were isolated and hybridized to the genomic DNA of seedlings grown at 10 degrees C or 30 degrees C. The redundancies of sequences recognized by four probes ( FaA5, FaH8, FaH13 and FaH14), were found to differ significantly in the two DNAs. DNA sequences recognized by FaH8, FaH13 and FaH14 were more represented in the genome of the 30 degrees C-raised seedlings than in the genome of the 10 degrees C-raised seedlings (76.5 x 10(3), 1.9 x 10(3), and 111.8 x 10(3) copies per haploid, 1C genome vs 62.7 x 10(3), 1.3 x 10(3), and 80.8 x 10(3) copies, respectively). In contrast, FaA5-related sequences were more represented in the genome of seedlings grown at the lower temperature (15.5 x 10(3) vs 10.2 x 10(3) copies, respectively). Southern-blot hybridization of these repeats to digested genomic DNA produced patterns which indicated that the probe sequences were part of longer repeated sequences having a limited degree of structural heterogeneity. These patterns were partly different when the probes were hybridized to the DNA from seedlings grown at 10 degrees C or 30 degrees C. In situ hybridization showed that the DNA sequences recognized by each probe were scattered along the length of all the chromosomes, with preferential location of FaA5- and FaH13-related sequences at given, mainly centromeric, regions of certain chromosomes. These findings suggest that redundancy modulations of interspersed repeated sequences allow direct responses of the genome of F. arundinacea to changes in environmental temperature.
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Affiliation(s)
- M. Ceccarelli
- Dipartimento di Biologia Cellulare e Molecolare della Università, Sezione di Citologia e Genetica, Via A. Pascoli, I-06123 Perugia, Italy
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Bianchini C, Frediani M, Mantovani G, Vizza F. Synthesis of Polymer-Supported Rhodium(I)−1,3-Bis(diphenylphosphino)propane Moieties and Their Use in the Heterogeneous Hydrogenation of Quinoline and Benzylideneacetone. Organometallics 2001. [DOI: 10.1021/om0010868] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abstract
The nucleotide sequences of the internal transcribed spacers (ITS1 and ITS2) of ribosomal DNA from Picea abies are reported. Two types of ITS1 of 2784 bp and 3271 bp long exist, whereas only one ITS2 type 238 bp long is present in this species. The shorter ITS1 is characterized by three shorter subrepeats: ssr1, ssr2 and ssr3, 221 bp, 227 bp and 226 bp long respectively. Between the ssr1 and ssr2 sub-repeats are inserted three longer sub-repeats: LSR1, LSR2 and LSR3, 480 bp, 480 bp and 581 bp long respectively. The similarity between the three ssr range from 66% to 79% and between the three LSR range from 65% to 96%. At the end of the LSR3 a microsatellite of 14 CT elements is present. The longer ITS1 type is due to a duplication of the LSR1, most probably obtained by unequal crossing-over and it has an identity of 97.3% with the shorter ITS1 type.
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Affiliation(s)
- F Maggini
- Dipartimento di Agrobiologia e Agrochimica, Università degli Studi della Tuscia, Viterbo, Italy.
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Bianchini C, Frediani M, Vizza F. Synthesis of the first polymer-supported tripodal triphosphine ligand and its application in the heterogeneous hydrogenolysis of benzo[b]thiophene by rhodium catalysis. Chem Commun (Camb) 2001. [DOI: 10.1039/b010128l] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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