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  • 1
    Electronic Resource
    Electronic Resource
    Solid-to-liquid phase change and fragmentation in C60 (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 2151-2155 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present a study of the thermodynamical properties of C60 in the microcanonical ensemble. Solidlike and metastable liquidlike form can be identified in the low energy and in the high energy range, respectively. The transition between the two phases is characterized by a finite energy range, in agreement with general theories of cluster melting. In particular, we have observed that the melting is preceded by a highly isomerized transition region where a sizeable atomic mobility is achieved via hopping between different isomer structures. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468736
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  • 2
    Electronic Resource
    Electronic Resource
    Prediction of new sp2 and sp2/sp3 hollow carbon crystals (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 2311-2316 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Among the hypothetical forms of fully covalent carbon lattices with either graphite-like sp2 or mixed sp2/sp3 bonding we investigated the possibility of monocrystals with a hollow structure. We have calculated the structural, elastic and electronic properties of two prototypical face–centered cubic lattices C20 and C22, respectively, making also a critical comparison to diamond and graphite. The first of these lattices belongs to a new class of sp2–bonded periodic solids which we call hollow graphites. We give a topological classification of such solids along with the algorithm to generate them. Both crystals, having a nanoporous lattice made of periodic sequence of adjacent cavities, rather than the tubular structure of schwarzites, are characterized by a large internal specific area and should be suitable to form reversible high capacity lithium insertion compounds. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473090
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  • 3
    Electronic Resource
    Electronic Resource
    Aspects of early development in the Adriatic sturgeon Acipenser naccarii (1999)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of applied ichthyology 15 (1999), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: This study investigates the development of the sensory-cutaneous apparatus and digestive tract of Adriatic sturgeon (Acipenser naccarii). Light and electron microscopy observations were carried out on various developmental stages, from hatching to 180 days old.At hatching, sturgeon pre-larvae exhibit differentiation of olfactory sensory cells. By day 4 taste buds are differentiated on lips and barbels. At 12 days after hatching, the larvae are equipped with an extensive ventral cephalic sensory apparatus. Electrosensory organs are arranged in regular lines in the rostral ventral region, and taste receptors are organised in parallel rows on and inside the lips as well as on the external side of the barbel. Ventral free neuromasts are positioned in rostral grooves. The retina is completely differentiated in each stratum. At this stage, larvae show canine-like teeth on lips and pharynx, and the specific mucosae of the different digestive regions are differentiated. By day 36 the canine-like teeth are located exclusively on the tongue and roof of the buccal cavity, and the mouth is protrusible. At 180 days differentiation is still not completed, and although teeth have disappeared from the palate, they still persist along a central line on the tongue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0426.1999.tb00236.x
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  • 4
    Electronic Resource
    Electronic Resource
    Pre-fragmentation dynamics of C"6"0. A molecular dynamics investigation
    Amsterdam : Elsevier
    Chemical Physics Letters 225 (1994), S. 191-195 
    Details
    ISSN: 0009-2614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0009-2614(94)00619-9
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  • 5
    Electronic Resource
    Electronic Resource
    Asymptotic expansion and extrapolation for Bernstein polynomials with applications (1996)
    Springer
    BIT 36 (1996), S. 676-687 
    Details
    ISSN: 1572-9125
    Keywords: Bernstein polynomials ; extrapolation ; Chebyshev interpolation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Given a real functionf εC 2k [0,1],k ≥ 1 and the corresponding Bernstein polynomials {B n (f)} n we derive an asymptotic expansion formula forB n (f). Then, by applying well-known extrapolation algorithms, we obtain new sequences of polynomials which have a faster convergence thanB n (f). As a subclass of these sequences we recognize the linear combinations of Bernstein polynomials considered by Butzer, Frentiu, and May [2, 6, 9]. In addition we prove approximation theorems which extend previous results of Butzer and May. Finally we consider some applications to numerical differentiation and quadrature and we perform numerical experiments showing the effectiveness of the considered technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01733787
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  • 6
    Electronic Resource
    Electronic Resource
    Spectral and Computational Analysis of Block Toeplitz Matrices Having Nonnegative Definite Matrix-Valued Generating Functions (1999)
    Springer
    BIT 39 (1999), S. 152-175 
    Details
    ISSN: 1572-9125
    Keywords: Toeplitz matrix ; generating function ; ergodic theorem ; preconditioning ; conjugate gradient method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract It is well known that the generating function f ∈ L 1([−π, π], ℜ) of a class of Hermitian Toeplitz matrices A n(f) n describes very precisely the spectrum of each matrix of the class. In this paper we consider n × n Hermitian block Toeplitz matrices with m × m blocks generated by a Hermitian matrix-valued generating function f ∈ L 1([−π, π], C m×m ). We extend to this case some classical results by Grenander and Szegö holding when m = 1 and we generalize the Toeplitz preconditioning technique introduced in the scalar case by R. H. Chan and F. Di Benedetto, G. Fiorentino and S. Serra. Finally, concerning the spectra of the preconditioned matrices, some asymptotic distribution properties are demonstrated and, in particular, a Szegö-style theorem is proved. A few numerical experiments performed at the end of the paper confirm the correctness of the theoretical analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022329526925
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  • 7
    Electronic Resource
    Electronic Resource
    Computerized tomography in amyotrophic choreo-acanthocytosis (1987)
    Springer
    Neuroradiology 29 (1987), S. 480-482 
    Details
    ISSN: 1432-1920
    Keywords: Acanthocytosis ; Amyotrophy ; Dyskinesias ; Computerized tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary CT has been performed in five patients affected by amyotrophic choreo-acanthocytosis (ACA) and bicaudate diameter, bicaudate index and frontal horn/bicaudate ratio (FH/CC) have been evaluated. Findings have been confirmatory of caudate nuclei atrophy as shown by previous ACA autopsy reports, but did not differ from Huntington's chorea CT picture. There was no correlation between CT measurements and age, illness duration or degree of hyperkinesia in contradistinction to that reported for Huntington's chorea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00341748
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  • 8
    Electronic Resource
    Electronic Resource
    Amyotrophic choreoacanthocytosis: Is it really a very rare disease? (1986)
    Springer
    Neurological sciences 7 (1986), S. 521-524 
    Details
    ISSN: 1590-3478
    Keywords: Amiotrophy choreoacanthocytosis ; hyperkinesia ; acanthocytosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Sommario La coreo-acantocitosi amiotrofica (ACA) è una malattia ereditaria caratterizzata da atrofia muscolare neurogena, ipercinesie (con morsicature della lingua e/o delle labbra), acantocitosi, normalità del quadro lipoproteico ed insorgenza in età adulta. In questo articolo vengono descritti otto casi appartenenti a tre famiglie. Viene messa in discussione la presunta rarità della malattia.
    Notes: Abstract Amyotrophic choreoacanthocytosis (ACA) is a hereditary disease characterized by adult onset, hyperkinesias (with tongue and/or lip biting), neurogenic muscular atrophies, acanthocytosis and normal blood lipoprotein pattern. In this paper we cite 8 patients belonging to three families, describing 6 patients of two of the families. We query the supposed rarity of the disease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02342031
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  • 9
    Electronic Resource
    Electronic Resource
    A case of Kufs disease with abnormal pallidonigral iron deposit (1985)
    Springer
    Neurological sciences 6 (1985), S. 225-231 
    Details
    ISSN: 1590-3478
    Keywords: Neuronal lipofuscinosis ; Kufs disease ; Hallervorden Spatz syndrome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Sommario Descrizione clinica, neuropatologica ed ultrastrutturale di un caso di malattia di Kufs (“Forma dei nuclei della base” di Meyer). Nel caso studiato, oltre ai tipici reperti della Ceroido-lipofuscinosi neuronale, è stato rilevato un incremento della reazione per il ferro a livello pallido-nigrico. Viene discusso in particolare il significato di quest'ultimo reperto.
    Notes: Abstract The clinical, neuropathological and ultrastructural features of a case of Kufs disease (Meyer basal ganglia form) are, reported. In the present case, besides the typical lesions of Neuronal Ceroid-Lipofuscinosis, and increased iron reaction at pallidonigral level was detected histochemically. The significance of the last finding is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02229197
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  • 10
    Electronic Resource
    Electronic Resource
    Amyotrophic choreo-acanthocytosis: A neuropathological and immunocytochemical study (1993)
    Springer
    Neurological sciences 14 (1993), S. 49-54 
    Details
    ISSN: 1590-3478
    Keywords: Amyotrophic choreo-acanthocytosis ; degenerative disease ; neuropathology ; immunohistochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Sommario Un paziente di 47 anni, membro di una fratria affetta da Coreo-Acantocitosi Amiotrofica, è stato oggetto di studio neuropatologico, dopo alcuni anni di osservazione clinica. Oltre ai già noti reperti di microscopia ottica (perdita neuronale, gliosi astrocitaria e “status spongiosus” a livello dei nuclei della base, soprattutto del nucleo caudato), immunocitochimicamente furono evidenziati alcuni neuroni striatali MEnk+ e NPY+. A livello del midollo spinale non era riconoscibile perdita neuronale, invece si osservavano modesta demielinizzazione e iperplasia astrocitaria interfascicolare a carico dei tratti lunghi. I reperti presenti a livello del muscolo striato e del tronco nervoso periferico corrispondevano a quelli già descritti su materiale bioptico dello stesso paziente, prelevato alcuni anni prima. I diversi dati neuropatologici e immunocitochimici del caso osservato sono discussi particolarmente in riferimento alla diagnosi differenziale tra Coreo-Acantocitosi Amiotrofica e Corea di Huntington.
    Notes: Abstract A 47 year old man, one of a sibship affected by amyotrophic choreo-acanthocytosis was studied neuropathologically after some years of clinical observation. Besides the classic optical findings (neuronal loss, astrocytic gliosis and “status spongiosus” in the basal ganglia, namely in the caudate nucleus) a few MEnk+ and NPY+ neurons were observed immunocytochemically in the striatum. In the spinal cord also, while no neuronal loss was perceivable, both mild demyelination and interfibrillary astrocytic hyperplasia of the long tracts were present. On the other hand, microscopic findings of muscle and peripheral nerve showed no differences from what was previously intra-vitam appreciated in the same patient. The neuropathological and immunocytochemical findings of this case are discussed in relation to the differential diagnosis between amyotrophic choreoacanthocytosis and Huntington's disease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02339042
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