A rescue transcatheter solution for early sutureless basal ring infolding

2021 ◽  
Author(s):  
Antonio Loforte ◽  
Giuseppe Comentale ◽  
Giuditta Coppola ◽  
Ciro Amodio ◽  
Luca Botta ◽  
...  
Keyword(s):  
Basal Ring

scholarly journals A new species of Procamallanus Baylis, 1923 (Nematoda, Camallanidae) from Astronotus ocellatus (Agassiz, 1831) (Perciformes, Cichlidae) in Brazil

ZooKeys ◽  
2018 ◽  
Vol 790 ◽  
pp. 21-33 ◽  
Author(s):  
Raul Henrique da Silva Pinheiro ◽  
Francisco Tiago de Vasconcelos Melo ◽  
Scott Monks ◽  
Jeannie Nascimento dos Santos ◽  
Elane Guerreiro Giese
Keyword(s):  
New Species ◽  
Geographical Distribution ◽  
Buccal Capsule ◽  
Brazilian Amazon ◽  
Basal Ring ◽  
The Third ◽  
Astronotus Ocellatus ◽  
Size And Morphology ◽  
A New Species

A new species ofProcamallanusBaylis, 1923 was found as a parasite of the fishAstronotusocellatus(Agassiz, 1831) from a lake in the Jardim Botânico Bosque Rodrigues Alves, Belém, Brazil.Procamallanusspiculastriatussp. n.has a smooth buccal capsule and a well-developed basal ring that is armed with four sclerotized tooth-like structures. The male of the new species is similar to the two species that are known from Brazilian fish,P.peraccuratusPinto, Fábio, Noronha & Rolas, 1976, andP.annipetteraeKohn & Fernandes, 1988, by the absence of the gubernaculum. It differs from these two by the morphology of the buccal capsule, the number are arrangement of the caudal papillae in males, the size and morphology of the spicules and the shape of the tail of both sexes.Procamallanusspiculastriatussp. n.is the third species discovered in fish from Brazil. This finding extends the geographical distribution of the genus into the Brazilian Amazon.

Sperm ultrastructure in the ocean quahog Arctica islandica (Arcticidae) and Neotrapezium sublaevigatum (Trapezidae), with a discussion of relationships within the Arcticoidea and with other Euheterodonta (Bivalvia)

2020 ◽  
Vol 86 (3) ◽  
pp. 173-185
Author(s):  
John M Healy ◽  
Paula M Mikkelsen ◽  
Rüdiger Bieler
Keyword(s):  
North Atlantic ◽  
Marine Bivalve ◽  
Sperm Ultrastructure ◽  
Arctica Islandica ◽  
Basal Ring ◽  
Acrosomal Vesicle ◽  
The North ◽  
Sperm Characters ◽  
Distal Centriole ◽  
Reticulate Structure

ABSTRACT Sperm ultrastructure is described for the ocean quahog Arctica islandica (Linnaeus, 1767) (Arcticidae), a long-lived, and commercially and phylogenetically important marine bivalve from the North Atlantic, and for Neotrapezium sublaevigatum (Lamarck, 1819), an Indo-Pacific member of the only other family of Arcticoidea (Trapezidae). Spermatozoa of A. islandica consist of (in anterior to posterior sequence): an elongate-conical, deeply invaginated, acrosomal vesicle (length 2.0 ± 0.2 μm; invagination occupied by a granular subacrosomal material); a straight, anteriorly-tapered, rod-shaped nucleus (length 6.6 ± 0.4 μm); a short (approximately 0.8 μm) midpiece consisting of two orthogonally arranged centrioles, surrounded by four (approximately 75% of spermatozoa observed) or, less commonly, five (approximately 25% of spermatozoa observed) spherical mitochondria; nine satellite fibres connecting the distal centriole to mitochondria and the plasma membrane; and a flagellum (length 60 ± 5.0 μm, with 9+2 axoneme), originating from the distal centriole. Contents of the acrosomal vesicle of A. islandica are differentiated into a very electron-dense basal ring (with reticulate structure) and two less electron-dense zones. Spermatozoa of N. laevigatum (Lamarck, 1819) differ substantially from those of A. islandica and are characterized by: a rounded-conical, deeply invaginated, acrosomal vesicle (length 0.43 ± 0.2 μm), with a curved basal ring and two less conspicuous components; a barrel-shaped nucleus (length 1.6 ± 0.5 μm) with a broad apical depression accommodating the base of the acrosomal vesicle; a midpiece composed of five (approximately 80% of spermatozoa observed) or four (approximately 20% of spermatozoa observed) mitochondria. Centriolar and flagellar details are essentially as for A. islandica, and putative glycogen deposits are associated with the distal centriole and mitochondria in both species. Sperm data corroborate recent transcriptomic analyses separating Arcticidae and Trapezidae in different imparidentian clades. Based on sperm morphology, A. islandica would appear more closely related to the Glauconomidae of the Cyrenoidea than to the Trapezidae, Veneroidea or any other previously examined group of euheterodonts, suggesting that it could be the only living member of the Arcticoidea. The relationships of the Trapezidae remain uncertain, with apparent sperm similarities to members of several groups of euheterodonts (e.g. Tellinoidea, Pholadoidea, Galeommatoidea), while several potentially closely related key taxa (e.g. Glossidae) remain unstudied for sperm characters.

scholarly journals Morphology of the first instar larvae of two species of Taxigramma PERRIS, 1852 (Diptera: Sarcophagidae: Miltogramminae)

2013 ◽  
Vol 82 (4) ◽  
pp. 365-377 ◽  
Author(s):  
Krzysztof Szpila ◽  
Thomas Pape
Keyword(s):  
Instar Larva ◽  
Maxillary Palpus ◽  
Partial Reduction ◽  
Basal Ring ◽  
Facial Mask ◽  
Anal Region ◽  
Ground Plan ◽  
Substantial Modification ◽  
First Instar ◽  
Thoracic And Abdominal

ABSTRACT The first instar larva is described for two species of the kleptoparasitic miltogrammine genus Taxigramma PERRIS: T. albina (ROHDENDORF) and T. karakulensis (ENDERLEIN). Using a combination of light microscopy and scanning electron microscopy, the following morphological structures are documented: pseudocephalon, antennal complex, maxillary palpus, facial mask, modifications of thoracic and abdominal segments, anal region, spiracular field, posterior spiracles and details of the cephaloskeleton. The first instar larvae of T. albina and T. karakulensis exhibit substantial modification of their morphology by presence of large antennal dome, partial reduction of the antennal basal ring, lack of oral ridges, lack of dorsal bridge, strong modification of spinulation and lack of hair-like spines around the spiracular field. These character states may be treated as apomorphies in comparison with the plesiomorphic ground plan defined for larvae of saprophagous calyptrate flies.

scholarly journals Serial Section-Based 3D Reconstruction of Anaxagorea (Annonaceae) Carpel Vasculature and Implications on Integrated Axial-Foliar Origin of Angiosperm Carpels

2020 ◽  
Author(s):  
Ya Li ◽  
Wei Du ◽  
Ye Chen ◽  
Shuai Wang ◽  
Xiao-Fan Wang
Keyword(s):  
Basic Unit ◽  
Molecular Evidence ◽  
Vascular Bundles ◽  
Flowering Stage ◽  
Basal Ring ◽  
Floral Organogenesis ◽  
Homologous Structure ◽  
Phylogenetic Origin ◽  
Circular Arrangement ◽  
Lateral Bundle

The carpel is the basic unit of the gynoecium in angiosperms and one of the most important morphological features distinguishing angiosperms from gymnosperms; therefore, carpel origin is of great significance in angiosperm phylogenetic origin. Recent consensus favors the interpretation that the carpel originates from the fusion of an ovule-bearing axis and the phyllome that subtends it. It has been confirmed by morphological and molecular evidence that foliar homologs are involved in carpel evolution. Consequently, if axial homologs can be traced in the carpel, it would more likely be derived from an integrated axial-foliar structure. This study aimed to reveal the axial structures in carpels by analyzing the continuous changes in vasculature from the receptacle to the carpels and ovules. Anaxagorea is the most basal genus in a primitive angiosperm family, Annonaceae. The conspicuous carpel stipe at the base of each carpel makes it an ideal material for exploring the possible axial homologous structure in the carpel. In this study, floral organogenesis and the topological vasculature structure were delineated in Anaxagorea luzonensis and Anaxagorea javanica, and a 3D-model of the carpel vasculature was reconstructed based on the serial sections. The results show that (1) at the flowering stage, the number of vascular bundles entering each Anaxagorea carpel from the receptacle was significantly higher than three, arranged in a radiosymmetric pattern, and forming a basal ring at the base of each carpel. (2) All carpel bundles were only connected with the central stele. (3) At the slightly upper part of the carpel, all lateral bundles from the basal ring were reorganized into two groups, each forming a lateral bundle complex below the respective placenta. Bundles in each lateral bundle complex were also ringed. (4) The ovule bundles were composed of non-adjacent bundles in the lateral bundle complex. The results of the present study suggest that the circular arrangement of bundles in the receptacle, carpel stipe, and placenta of Anaxagorea are in line with the composite axial-foliar nature of the carpel, and provide a morphological basis for further research on the origin of the carpel.

Cusp-based geometric height-oriented repair of a pediatric aortic valve

2020 ◽  
Keyword(s):  
Aortic Valve ◽  
Septal Defect ◽  
Aortic Valve Repair ◽  
Valve Repair ◽  
Basal Ring ◽  
Sinotubular Junction ◽  
Effective Height ◽  
Institutional Experience ◽  
Conotruncal Anomalies ◽  
Geometrical Concepts

Progressive aortic regurgitation can occur in pediatric patients due to root dilation with conotruncal anomalies or cusp prolapse associated with a ventricular septal defect. It is treated using various approaches influenced by personal preferences and institutional experience. We applied geometrical concepts developed for adult aortic valve repair to pediatric valves. The basal ring and sinotubular junction are downsized in relation to the geometric height of the cusp by external suture annuloplasty. The length of the cusp free margin is then adjusted with central plication, guided by measuring the effective height of the cusp. This approach facilitates the reproducibility and predictability of pediatric aortic valve repair.

Relationship between the membranous septum and the virtual basal ring of the aortic root in candidates for transcatheter implantation of the aortic valve

2018 ◽  
Vol 31 (4) ◽  
pp. 525-534 ◽  
Author(s):  
Shumpei Mori ◽  
Justin T. Tretter ◽  
Takayoshi Toba ◽  
Yu Izawa ◽  
Natsuko Tahara ◽  
...  
Keyword(s):  
Aortic Valve ◽  
Aortic Root ◽  
Basal Ring ◽  
Transcatheter Implantation ◽  
Membranous Septum

scholarly journals First Report of Powdery Mildew on Heath Aster Caused by Erysiphe cichoracearum in Argentina

Plant Disease ◽  
2000 ◽  
Vol 84 (9) ◽  
pp. 1044-1044
Author(s):  
S. Wolcan ◽  
L. Ronco
Keyword(s):  
Powdery Mildew ◽  
Buenos Aires ◽  
Morphological Characteristics ◽  
Buenos Aires Province ◽  
Abaxial Surface ◽  
Basal Ring ◽  
First Report ◽  
Erysiphe Cichoracearum ◽  
Aster Ericoides ◽  
Germ Tubes

In 1995, powdery mildew was observed on commercial greenhousegrown Aster ericoides L. from La Plata, Buenos Aires Province. The disease affected about 95% of the growers. Mildew first appeared as white circular patches on the adaxial surface of leaves. As disease progressed, the abaxial surface of leaves, petioles, stems, and calyces were covered by cottony masses of mycelium and conidia, and basal leaves later wilted and died. Young plants (4 to 5 leaves) through flowering plants were affected. Conidia were ovoid-cylindrical, often slightly constricted at the ends, and were produced in chains on unbranched conidiophores. Conidia lacked fibrosin bodies and ranged from 30 to 41 μm × 10 to 19 μm. Long unbranched germ tubes were formed from the ends of conidia. The morphological characteristics of the fungus fit those described for Erysiphe cichoracearum DC (1). In addition, the perfect stage was found on older tissues. Subglobose, dark brown cleistothecia (105 to 210 μm in diameter) with a basal ring of myceloid appendages were observed. Cleistothecia contained multiple ellipsoid asci (48 to 69 μm × 30 to 37 μm) with two hyaline, one-celled, ellipsoid ascospores (22 to 26 μm × 11 to 15 μm). Pathogenicity was tested by pressing diseased leaves onto healthy leaves of aster cv. Sunset and incubating plants in humidity chambers for 48 h. The powdery mildew that developed was morphologically identical to the original isolate. This is the first report of E. cichoracearum on heath aster in Argentina. Reference: (1) H. J. Boesewinkel. Bot. Rev. 46:167, 1980.

Morphological and anatomical development in the Vitaceae. V. Vegetative and floral development in Ampelopsis brevipedunculata

1989 ◽  
Vol 67 (8) ◽  
pp. 2371-2386 ◽  
Author(s):  
Jean M. Gerrath ◽  
Usher Posluszny
Keyword(s):  
Apical Meristem ◽  
Floral Development ◽  
Three Dimensional ◽  
Growing Season ◽  
Axillary Buds ◽  
Histological Techniques ◽  
Basal Ring ◽  
Stamen Primordia ◽  
The Common ◽  
Subsequent Activity

The vegetative and floral development of Ampelopsis brevipedunculata was studied using both three-dimensional and histological techniques. An uncommitted primordium (which usually develops into a tendril in young seedlings and a cymose inflorescence in mature plants) is initiated opposite every leaf on the flank of the shoot apical meristem. Flowers are hermaphroditic, pentamerous, and protandrous. The sepals are initiated spirally, and form a calyx unit as the result of subsequent activity of a basal ring primordium. The common petal–stamen primordia are initiated simultaneously, but differentiate into petals and stamens unidirectionally. The gynoecium is initiated as a ring primordium, which produces two septa from the inner gynoecium wall. Two bitegmic, anatropus ovules arise from the base of each septum. At maturity the gynoecium is superior and two-loculed. Pollen is tricolporate. A nectar-secreting disc arises from the base of the ovary. The fruit is a turquoise-blue berry, containing one to four seeds. Axillary buds, present at each node, develop sylleptically and normally abscise at the end of the growing season. A vertical series of as many as six serial axillary buds develop basipetally to form the overwintering buds, which are not externally visible.

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