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FRAGILARIA CAPUCINA DESM. VAR MESOGONGYLA FRENGUELLI, UNA DIATOMEA PRESENTE EN LA ZONA NORTE DE LA CORDILLERA DE LOS ANDES (CHILE), CON COMENTARIOS SOBRE LA VARIABILIDAD DEL NUMERO DE PROCESOS LABIADOS EN ALGUNOS GéNEROS ARAFIDALES FRAGILARIA CAPUCINA DESM. VAR MESOGONGYLA FRENGUELLI, A DIATOM DISTRIBUTED IN NORTHERN ZONE OF LOS ANDES MOUNTAINS (CHILE), WITH COMMENTS ON THE VARIABILITY OF THE NUMBER OF LABIATE PROCESSES IN SOME ARAPHID GENERA  [cached]
Patricio Rivera R,Fabiola Cruces L
Gayana. Botanica , 2008,
Abstract: La diatomeaFragilaria capucina var. mesogongyla, descrita originalmente por Frenguelli desde Calama, Chile (22°28' S, 68°56'W), fue encontrada en una muestra recolectada en el río Lauca, a gran altitud en el norte de Chile (18°30'S, 69°16'W). Por primera vez este taxón se estudia mediante técnicas de microscopía electrónica (SEM). Siendo muy raro para el género Fragilaria, esta variedad presenta un proceso labiado en cada polo valvar (dos por valva). Se entrega una diagnosis corregida, y fotografías ilustran las principales características morfológicas del taxón. The diatom Fragilaria capucina var. mesogongyla, originally described by Frenguelli from Calama, Chile (22°28'S, 68°56' W), was found in a sample collected in the Lauca River, at high altitude in northern Chile's (18°30'S,69°16' W). For the first time, the taxon is studied by scanning electron microscopy (SEM). Unusual for the genus Fragilaria, this variety exhibits one labiate process on each valve pole (two per valve). An amended diagnosis is given, and photographs illustrate the principal morphological features of this taxon.
FRAGILARIA CAPUCINA DESM. VAR MESOGONGYLA FRENGUELLI, UNA DIATOMEA PRESENTE EN LA ZONA NORTE DE LA CORDILLERA DE LOS ANDES (CHILE), CON COMENTARIOS SOBRE LA VARIABILIDAD DEL NUMERO DE PROCESOS LABIADOS EN ALGUNOS GéNEROS ARAFIDALES
Rivera R,Patricio; Cruces L,Fabiola;
Gayana. Botánica , 2008, DOI: 10.4067/S0717-66432008000200002
Abstract: the diatom fragilaria capucina var. mesogongyla, originally described by frenguelli from calama, chile (22°28's, 68°56' w), was found in a sample collected in the lauca river, at high altitude in northern chile's (18°30's,69°16' w). for the first time, the taxon is studied by scanning electron microscopy (sem). unusual for the genus fragilaria, this variety exhibits one labiate process on each valve pole (two per valve). an amended diagnosis is given, and photographs illustrate the principal morphological features of this taxon.
Localization genus  [PDF]
Jesper M. M?ller,Jerome Scherer
Mathematics , 2015,
Abstract: Which spaces look like an n-sphere through the eyes of the n-th Postnikov section functor and the n-connected cover functor? The answer is what we call the Postnikov genus of the n-sphere. We define in fact the notion of localization genus for any homotopical localization functor in the sense of Bousfield and Dror Farjoun. This includes exotic genus notions related for example to Neisendorfer localization, or the classical Mislin genus, which corresponds to rationalization.
Symplectic genus, minimal genus and diffeomorphisms  [PDF]
Bang-He Li,Tian-Jun Li
Mathematics , 2001,
Abstract: In this paper, the symplectic genus for any 2-dimensional class in a 4-manifold admitting a symplectic structure is introduced, and its relation with the minimal genus is studied. It is used to describe which classes in rational and irrational ruled manifolds are realized by connected symplectic surfaces. In particular, we completely determine which classes with square at least -1 in such manifolds can be represented by embedded spheres. Moreover, based on a new characterization of the action of the diffeomorphism group on the intersection forms of a rational manifold, we are able to determine the orbits of the diffeomorphism group on the set of classes represented by embedded spheres of square at least -1 in any 4-manifold admitting a symplectic structure.
Virtual Genus of Satellite Links  [PDF]
Daniel S. Silver,Susan G. Williams
Mathematics , 2013,
Abstract: The virtual genus of a virtual satellite link is equal to that of its companion.
Additivity of free genus of knots  [PDF]
Makoto Ozawa
Mathematics , 1998,
Abstract: We show that free genus of knots is additive under connected sum.
The Stable Concordance Genus  [PDF]
M. Kate Kearney
Mathematics , 2013,
Abstract: The concordance genus of a knot is the least genus of any knot in its concordance class. Although difficult to compute, it is a useful invariant that highlights the distinction between the three-genus and four-genus. In this paper we define and discuss the stable concordance genus of a knot, which describes the behavior of the concordance genus under connected sum.
The development of the princial genus theorem  [PDF]
Franz Lemmermeyer
Mathematics , 2002,
Abstract: In this article we sketch the development of the principal genus theorem from its conception by Gauss in the case of binary quadratic forms to the cohomological formulation of the principal genus theorem of class field theory by Emmy Noether.
On the concordance genus of topologically slice knots  [PDF]
Jennifer Hom
Mathematics , 2012,
Abstract: The concordance genus of a knot K is the minimum Seifert genus of all knots smoothly concordant to K. Concordance genus is bounded below by the 4-ball genus and above by the Seifert genus. We give a lower bound for the concordance genus of K coming from the knot Floer complex of K. As an application, we prove that there are topologically slice knots with 4-ball genus equal to one and arbitrarily large concordance genus.
The genus Cladosporium
K. Bensch,U. Braun,J.Z. Groenewald,P.W. Crous
Studies in Mycology , 2012,
Abstract: A monographic revision of the hyphomycete genus Cladosporium s. lat. (Cladosporiaceae, Capnodiales) is presented. It includes a detailed historic overview of Cladosporium and allied genera, with notes on their phylogeny, systematics and ecology. True species of Cladosporium s. str. (anamorphs of Davidiella), are characterised by having coronate conidiogenous loci and conidial hila, i.e., with a convex central dome surrounded by a raised periclinal rim. Recognised species are treated and illustrated with line drawings and photomicrographs (light as well as scanning electron microscopy). Species known from culture are described in vivo as well as in vitro on standardised media and under controlled conditions. Details on host range/substrates and the geographic distribution are given based on published accounts, and a re-examination of numerous herbarium specimens. Various keys are provided to support the identification of Cladosporium species in vivo and in vitro. Morphological datasets are supplemented by DNA barcodes (nuclear ribosomal RNA gene operon, including the internal transcribed spacer regions ITS1 and ITS2, the 5.8S nrDNA, as well as partial actin and translation elongation factor 1-α gene sequences) diagnostic for individual species. In total 993 names assigned to Cladosporium s. lat., including Heterosporium (854 in Cladosporium and 139 in Heterosporium), are treated, of which 169 are recognized in Cladosporium s. str. The other taxa are doubtful, insufficiently known or have been excluded from Cladosporium in its current circumscription and re-allocated to other genera by the authors of this monograph or previous authors.
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