Neue Notodelphyiden des Berliner und Hamburger Museums

Schellenberg, A.

doi:10.1002/mmnz.4830100202

Cited by 2 publications

(2 citation statements)

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“…Besides the resin powder, the liquid component of the dental material can contribute to an additional impact modification of the autopolymerized hypoallergenic denture base polymer, independently of the system formulation as a paste/paste or powder/liquid . Therefore, a reactive methacrylate terminated liquid butadiene polymer was used for impact modification in an autopolymerizing hypoallergenic denture base material formulated as a paste/paste composition.…”

Section: Resultsmentioning

confidence: 99%

Processing behavior and mechanical properties of autopolymerizing hypoallergenic denture base polymers

Schellenberg

Otto

Schadewald

2014

J of Applied Polymer Sci

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Driven by the phenomenon of increasing irritations and allergic reactions of dental prosthesis carriers preferably due to residual methyl methacrylate monomer in conventional dental materials, autopolymerizing hypoallergenic denture base polymers were prepared as two‐component materials in the shape of paste/paste‐ or powder/liquid systems. The processing behavior of these materials was investigated regarding the processing and solidification times also in dependence on the polymerization catalyst concentration, whereas the whole processing and curing characteristics and the final polymer properties were evaluated by dynamic mechanical analysis in shear mode in the temperature range from −145°C to 200°C. The mechanical properties of the hypoallergenic denture base polymers were validated regarding stiffness (flexural modulus E') and fracture toughness (maximum factor of loading intensity Kmax, total work of fracture Wf) and the effects of monomer composition, kind of resin powder, impact modification by the liquid component, and water immersion on these properties were investigated. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41378.

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Section: Resultsmentioning

confidence: 99%

Processing behavior and mechanical properties of autopolymerizing hypoallergenic denture base polymers

Schellenberg

Otto

Schadewald

2014

J of Applied Polymer Sci

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“…taken in 250 m off South Georgia. POSITION AND FEEDING ACTIVITIES OF THE COPEPOD Schellenberg (1921) summarized in tabular form the then available information regarding the site occupied by Ascidicola rosea within its various ascidian hosts, and the occasional records of the past thirty years have added to his list little of material value. In most cases, it is reported to occur in the pharynx, although a minority of observers have collected specimens from the stomach and intestine.…”

Section: General Considerationsmentioning

confidence: 99%

The biology of a commensal copepod,Ascidicola roseaThorell, in the ascidianCorella parallelogramma(Müller)

Gotto

1957

J. Mar. Biol. Ass.

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(Text-figs. 1 and 2)The considerable advantages offered by ascidians as hosts to small commensal crustaceans are clearly implied by the large number of ascidicolous copepods which have been described; and the attractions of this particular niche are further evidenced by the fact that these copepod mess-mates are of polyphyletic origin and cosmopolitan distribution.The study of such associations, however, has been limited almost entirely to a bare note of their existence, although the papers of Canu (1892) and Chatton & Brement (1915) are partial exceptions.That ascidians so frequently act as hosts is not in itself surprising. Their comparative immunity from predation, their maintenance of a feeding current and the capaciousness of many of their internal cavities afford protection, accessible food and a certain freedom of movement. Furthermore, the elaborate ascidian mechanism of food intake and concentration offers, in its several stages, different possibilities of utilization to copepod commensals of varying structure and mobility. Thus, in the pharynx alone, a commensal might exploit the particles entering the oral aperture; or it might seek these as, trapped in the moving sheets of mucus, they are slowly swept towards the dorsal lamina; or, yet again, the concentrated food string, en route to the oesophagus and stomach, might be the focus of attention. Encompassed, therefore, by this complex nutritional mechanism many variously adapted copepods find optimal living conditions.In any attempt to shed some light on associations of this type, three conditions must be satisfied. The chosen copepod species must be of relatively large size, the ascidian concerned must possess an unusually transparent test, and observations must be made in a fairly large volume of undisturbed sea water to ensure normal behaviour on the part of the host. After a prolonged search for suitable material in Strangford Lough, Co. Down, it was found that the association between Ascidicola rosea Thorell and Corella parallelogramma (Muller) proved almost ideal. The female Ascidicola rosea attains a length of over 4 mm, while the glass-clear tunic of Corella parallelogramma is perhaps

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Neue Notodelphyiden des Berliner und Hamburger Museums

Cited by 2 publications

References 1 publication

Processing behavior and mechanical properties of autopolymerizing hypoallergenic denture base polymers

Processing behavior and mechanical properties of autopolymerizing hypoallergenic denture base polymers

The biology of a commensal copepod,Ascidicola roseaThorell, in the ascidianCorella parallelogramma(Müller)

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