Ultrastructure of the Tegumentary Pore-Canal System of the Acanthocephalan Moniliformis dubius

1969 ◽  
Vol 55 (5) ◽  
pp. 993 ◽  
Author(s):  
Richard D. Wright ◽  
Richard D. Lumsden
Keyword(s):  
Canal System ◽  
Pore Canal

scholarly journals The emergence of a complex pore‐canal system in the dermal skeleton of Tremataspis (Osteostraci)

2021 ◽  
Author(s):  
Oskar Bremer ◽  
Qingming Qu ◽  
Sophie Sanchez ◽  
Tiiu Märss ◽  
Vincent Fernandez ◽  
...  
Keyword(s):  
Canal System ◽  
Pore Canal

Jaw Fragment Pore Canal System [Mesh] [CT]

2021 ◽  
Author(s):  
Benedict King
Keyword(s):  
Canal System ◽  
Pore Canal

Fine structure of the cuticle, epidermis, and fat body of larval Elateridae (Coleoptera) and changes associated with molting

1972 ◽  
Vol 50 (11) ◽  
pp. 1463-1487 ◽  
Author(s):  
R. Y. Zacharuk
Keyword(s):  
Fine Structure ◽  
Fat Body ◽  
Lipid Monolayer ◽  
Fat Cells ◽  
Surface Lipid ◽  
Canal System ◽  
Transformation Zone ◽  
Pore Canal ◽  
Lipid Layers

The intermolt cuticle of three species of soil-inhabiting wireworms consists of four layers: non-oriented lipid over an oriented lipid monolayer, outer epicuticle. membrane epicuticle, and an inner dense epicuticle. Sclerites lack the surface lipid layers, but have a thinly laminated transformation zone underlying the epicuticle. There are three layers of exocuticle in sclerites, but only the central one of these is continuous through adjacent membranes. The cuticular pore canal system has medial axial filaments and peripheral fibrils, which seem to serve as wicks in transporting, primarily, lipids to the surface of membranes, and sclerotins, cuticulin, and lipids into the upper layers of cuticle in sclerites. In exuvial histolysis there is an initial degradation of subcuticle by enzymes from the epidermis before the new epicuticle is formed, and a subsequent histolysis of procuticular lamellae by enzymes from ecdysial droplets released primarily by ecdysohemocytes in the exuvial space after the new epicuticle is formed. The ecdysial membrane originates by delamination of the procuticular lamellae of the exuvium, and seems to consist primarily of enzyme-resistant components that accumulate from successive lamellae, particularly of sclerites, for discard with the exuvium at ecdysis. The dynamics of the epidermal and fat cells during formation of cuticle and muscle attachments are described and discussed.

Jaw Fragment Pore Canal System [Mesh] [CT]

2021 ◽  
Author(s):  
Benedict King
Keyword(s):  
Canal System ◽  
Pore Canal

Campanian and Maastrichtian hippuritid rudists (Hippuritida, Bivalvia) of the Chiapas Central Depression (southern Mexico) and implications for American multiple-fold hippuritid taxonomy

2018 ◽  
Vol 93 (2) ◽  
pp. 291-311
Author(s):  
Jose Maria Pons ◽  
Enric Vicens ◽  
Pedro García-Barrera
Keyword(s):  
Layer Structure ◽  
Outer Shell ◽  
Shell Layer ◽  
Left Valve ◽  
Canal System ◽  
Southern Mexico ◽  
Central Depression ◽  
Pore Canal ◽  
The Caribbean ◽  
The Right

AbstractHippuritids, particularly those with multiple-folds, are one of the most characteristic components in uppermost Cretaceous rudist-bearing strata of the Caribbean Province. The hippuritid rudist fauna of the Chiapas Central Depression includes the following taxa:Vaccinites vermuntiMac Gillavry, 1937 andBarrettiacf.B. ruseaeChubb, 1967 from the early Campanian Suchiapa Formation;B. moniliferaWoodward, 1862,B. gigasChubb, 1955, andParastroma trechmanniChubb, 1967 from the mid Campanian Suchiapa Formation; andPraebarrettia sparcilirata(Whitfield, 1897) from the early Maastrichtian Ocozocoautla Formation. These six species are described herein in detail. New observations on the outer shell layer structure of the right valve and the pore-canal system of the left valve led to amending the diagnoses of the g|eneraBarrettiaWoodward, 1862,ParastromaDouvillé, 1926, andPraebarrettiaTrechmann, 1924. Also, the revision of Chiapas’ and other American species of multiple-fold hippuritids led to proposed changes in their generic adscription.

A Sub-Dorsal Fin Pore/Canal System in the Centrolophid Fish Schedophilus maculatus (Pisces: Stromateoidei)

Copeia ◽  
1981 ◽  
Vol 1981 (2) ◽  
pp. 492 ◽  
Author(s):  
R. M. McDowall
Keyword(s):  
Canal System ◽  
Dorsal Fin ◽  
Pore Canal

Modeling the Effect of Flow Structures on Canal System Residence Time

2008 ◽  
Author(s):  
N. P. Benfer ◽  
B. A. King ◽  
C. J. Lemckert ◽  
S. Zigic
Keyword(s):  
Residence Time ◽  
Flow Structures ◽  
Canal System

Design of artificial lateral linesystem: biomimetic flow sensor and canal system

2014 ◽  
Author(s):  
C.H. Cho ◽  
J.W. Han ◽  
J.H. Won ◽  
Y.S. Ryuh
Keyword(s):  
Flow Sensor ◽  
Canal System

scholarly journals Micro-tomographic characterization of the root and canal system morphology of mandibular first premolars in a Chilean population

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Alfredo Sierra-Cristancho ◽  
Luis González-Osuna ◽  
Daniela Poblete ◽  
Emilio A. Cafferata ◽  
Paola Carvajal ◽  
...  
Keyword(s):  
Root Canal ◽  
Multiple Root ◽  
Root Anatomy ◽  
Type I ◽  
Micro Computed Tomography ◽  
Canal System ◽  
Root Canals ◽  
Wide Range ◽  
Root Canal System ◽  
Chilean Population

AbstractThis study aimed to analyze the root anatomy and root canal system morphology of mandibular first premolars in a Chilean population. 186 teeth were scanned using micro-computed tomography and reconstructed three-dimensionally. The root canal system morphology was classified using both Vertucci’s and Ahmed’s criteria. The radicular grooves were categorized using the ASUDAS system, and the presence of Tomes’ anomalous root was associated with Ahmed’s score. A single root canal was identified in 65.05% of teeth, being configuration type I according to Vertucci’s criteria and code 1MP1 according to Ahmed’s criteria. Radicular grooves were observed in 39.25% of teeth. The ASUDAS scores for radicular grooves were 60.75%, 13.98%, 12.36%, 10.22%, 2.15%, and 0.54%, from grade 0 to grade 5, respectively. The presence of Tomes’ anomalous root was identified only in teeth with multiple root canals, and it was more frequently associated with code 1MP1–2 of Ahmed’s criteria. The root canal system morphology of mandibular first premolars showed a wide range of anatomical variations in the Chilean population. Teeth with multiple root canals had a higher incidence of radicular grooves, which were closely related to more complex internal anatomy. Only teeth with multiple root canals presented Tomes’ anomalous root.

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