Search results for "Rust"
showing 10 items of 1659 documents
Tuhon ja rakkauden maisema
2014
Cuticle: Formation, Moulting and Control
1984
The relative rigidity of the arthropod exoskeleton makes it impossible for body size to increase continuously during the postembryonic development of these animals. Once they have hatched from the egg, they grow in steps, passing through a variable number of (larval) stages (Fig. 1 a). Apart from a few exceptions, there are between 3 and 10 such stages in the arachnids, 3–20 in the crustaceans, and 3–10 in the insects. In many cases a metamorphosis stage intervenes (some crustaceans; holometabolous insects) (Fig. 9b, c).
Factors affecting abundance of Triaenophorus infection in Cyclops strenuus, and parasite-induced changes in host fitness.
2000
Factors affecting the abundance of Triaenophorus crassus and Triaenophorus nodulosus procercoids in their copepod first intermediate host, Cyclops strenuus, and effects of infection on feeding behaviour, reproduction and survival of the host were studied experimentally. When exposed to the same number of coracidia, copepods harboured considerably less procercoids in the trials where ciliates or Artemia salina nauplii were given as alternative food items. The prevalence of infection was higher in adult copepods as compared with copepodite stage IV and stage V, and higher in stage V than in stage IV. The prevalences in adult females and males did not differ significantly from each other. The …
New data on the early development of Hysterothylacium aduncum (Nematoda, Anisakidae).
1998
This note reports on incidental observations of the early development of the third-stage larvae of Hysterothylacium aduncum from gadid fishes. Gravid H. aduncum females were collected from Pollachius virens, Pollachius pollachius. Gadus morhua, and Molva molva in Norwegian waters. The eggs were incubated at 20 per thousand salinity and 5 C. Spontaneous hatching of third-stage larvae was observed 10-25 days after egg deposition. These larvae were long lived and could infect Acartia tonsa copepods, the infections being maintained for up to 34 days. The morphology of the third-stage larvae in the copepods and some traits of the life cycle were similar to those reported in previous studies. How…
Potential predation pressure of littoral mysids on herring (Clupea harengus membras L.) eggs and yolk-sac larvae
2008
The predation potential of littoral mysid shrimps (Mysidacea) on Baltic herring (Clupea harengus membras L.) eggs and yolk-sac larvae was studied experimentally. The results showed that littoral mysids feed actively on both eggs and yolk-sac larvae. It was shown that Neomysis integer preys on eggs, which are not attached to the substrate. Alternative food (yolk-sac larvae or zooplankton) did not decrease feeding rate on eggs. Only gravel as a bottom material lowered the ingestion rate to nearly zero. The largest of the mysid species Praunus flexuosus ate yolk-sac larvae more than other mysids and most efficiently. Mysids switched to feed on eggs when larvae and eggs were offered simultaneou…
Legally protected cultural goods and bankruptcy proceedings
2020
This paper deals with general problems of legal aims of bankruptcy proceedings in connection with the aims of heritage protection – issues built by completely different systems of values. Bankruptcy is designed for protecting pecuniary interest of a limited group of people, while cultural heritage is protected for present and future generations, despite its current commercial significance. In the global environment, bankruptcy of a cultural goods owner usually has a cross-border range but national bankruptcy legislations and laws devoted to heritage protection differ in very serious aspects. For this reason the paper is not limited to any concrete legal order. There are discussed some impor…
Shear heating induced lithospheric-scale localization: Does it result in subduction?
2012
Abstract Even though it is a well-established fact that the Earth is currently in a plate-tectonics mode, the question on how to “break” lithospheric plates and initiate subduction remains a matter of debate. Here we focus on shear heating as a potential mechanism to cause lithospheric shear localization and subsequent subduction initiation in oceanic plates. It is shown that shear heating under some conditions (i) facilitates the formation of a lithospheric-scale shear zone and (ii) is capable of stabilizing a lithospheric-scale shear zone, thus creating the necessary condition for subduction initiation to occur. Furthermore, we demonstrate that not only the localization process is of impo…
Violenza, frustrazione, vanità. La visione pessimistica di Leonardo da Vinci nel «Bestiario» e nelle «Favole»
2019
Nel «Bestiario» e nelle «Favole» di Leonardo da Vinci compare a più riprese una visione della realtà e dei rapporti fra gli individui (qui ovviamente simboleggiati dagli animali e dalle piante) caratterizzata da violenza e sopraffazione: aspetti, questi, che provocano sovente un senso di frustrazione (o di impotenza) in chi li subisce, onde si giunge, da parte dello scrittore, a una conclusione pessimistica, improntata alla considerazione della ineluttabile vanità delle cose. Violence, frustration, vanity. The pessimistic vision of Leonardo da Vinci in the «Bestiary» and in the «Fables» · Leonardo da Vinci’s «Bestiary» and «Fables» often show a vision of reality and relationships between in…
Melt production, redistribution and accumulation in mid-crustal source rocks, with implications for crustal-scale melt transfer
2014
Abstract Ascent of granitic melt initiates under suprasolidus conditions in the mid- to lower crust before continuing through subsolidus rocks to higher crustal levels. Whereas migration of melt in suprasolidus rocks can occur in pervasive net-like structures and involve relatively small melt volumes, ascent through the subsolidus crust requires more focused, dyke-like structures and larger volumes to prevent freezing. Migmatites in the Aus granulite terrain, southern Namibia, preserve evidence that large-scale melt redistribution and accumulation occurred in the near-source region under suprasolidus conditions. Melt that was mainly produced in metapelitic rocks utilised pervasive small-sca…