Results 11 to 20 of about 10,148 (211)

Multiscale analysis on otolith structural features reveals differences in ontogenesis and sex in Merluccius merluccius in the western Adriatic Sea

open access: yesRoyal Society Open Science, 2022
Otolith biomineralization results from biochemical processes regulated by the interaction of internal (physiological) and external (environmental) factors which lead to morphological and ultrastructural variability at intra- and interspecific levels. The
Quinzia Palazzo   +9 more
doaj   +1 more source

FG Sagittae [PDF]

open access: yesInternational Astronomical Union Colloquium, 2002
AbstractFG Sagittae has evolved from a hot central star of a planetary nebula to an K-type supergiant within approximately the last 100 years. The generally accepted interpretation for this redward evolution is that of a late thermal pulse during the planetary nebula stage, wherein helium burning at the surface of the electron-degenerate carbon-oxygen ...
Detlef Schönberner, C. Simon Jeffery
openaire   +1 more source

Using of versine and sagitta calculations for log sawing optimization, part 1: Circular cross-section

open access: yesMaderas: Ciencia y Tecnología, 2021
Log sawing can be defined as a problem with obtaining squares from a cylindrical shaped raw material, log. There are traditional sawing methods such as live, cant, quarter, etc. for sawmills.
Hizir Volkan Gorgun
doaj   +1 more source

Abnormal otoliths in the marine fishes collected from the Persian Gulf and the Gulf of Oman [PDF]

open access: yesActa Ichthyologica et Piscatoria, 2018
Background. Although several researchers have examined otoliths of marine fishes from the Persian Gulf and the Gulf of Oman, none has reported abnormalities.
N. Manizadeh   +3 more
doaj   +3 more sources

The load bearing capacity of railway masonry arch bridges [PDF]

open access: yes, 2018
This paper deals with the way of calculating the load-bearing capacity of masonry arch railway bridges. It reviews the basic aspects of structural behaviour of these bridges, such as material non-linearity of masonry and interaction with the soil ...
Drahorád, Michal, Vokál, Marek
core   +3 more sources

Use of otolith shape to differentiate two lagoon populations of Pagellus erythrinus (Actinopterygii: Perciformes: Sparidae) in Tunisian waters [PDF]

open access: yesActa Ichthyologica et Piscatoria, 2018
Background. The common pandora, Pagellus erythrinus (Linnaeus, 1758), is widely distributed in the Black and the Mediterranean seas. Therefore, P. erythrinus is a valuable component of the commercial fishery in Tunisia and plays an important role in ...
M. Mejri   +7 more
doaj   +3 more sources

Chaetognatha of the Brazil-Malvinas (Falkland) confluence: distribution and associations

open access: yesIheringia: Série Zoologia, 2004
The planktonic chaetognaths from the Brazil-Malvinas (Falkland) confluence, extending between 36º 30' - 50º 5' S and 60º 33' - 41º 7' W, were studied. Ten species were found: Eukrohnia hamata (Möbius, 1875) (Eukrohniidae), Pterosagitta draco (Krohn, 1853)
Alina M. Crelier, María C. Daponte
doaj   +1 more source

Biomass and estimated production, and feeding pressure on zooplankton of chaetognaths in the Yellow Sea, China

open access: yesTerrestrial, Atmospheric and Oceanic Sciences, 2020
The biomass and estimated production, feeding rate of chaetognaths were studied in the Yellow Sea. Sagitta crassa, Sagitta enflata, Sagitta bedoti, and Sagitta nagae were found during the study period, and S. crassa and S. nagae were the dominant species.
Yuanzi Huo   +8 more
doaj   +1 more source

Seasonal chaetognath abundance and distribution in a tropical estuary (Southeastern, Brazil)

open access: yesBrazilian Journal of Oceanography, 2005
This study focuses on the seasonal variation of the chaetognath species in the Vitória Bay/Passage Channel estuarine system, Espírito Santo, Brazil, in terms of their abundance and distribution.
Luiz Loureiro Fernandes   +2 more
doaj   +1 more source

Otolith characterization and integrative species identification of adult mesopelagic fishes from the western North Atlantic Ocean

open access: yesFrontiers in Marine Science, 2023
Fish diversity and ecology in the ocean’s mesopelagic zone are understudied compared to other marine regions despite growing interest in harvesting these potential resources.
Lucinda A. Quigley   +10 more
doaj   +1 more source

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