Morphological variability among three geographically distinct Arctic charr (Salvelinus alpinusL.) populations reared in a common hatchery environment

2009 ◽  
Vol 18 (1) ◽  
pp. 106-116 ◽  
Author(s):  
M. Janhunen ◽  
N. Peuhkuri ◽  
J. Piironen
Keyword(s):  
Arctic Charr ◽  
Morphological Variability

On the morphological variability and systematic position of Cyclotella rossii Håkansson (Bacillariophyta)

2019 ◽  
pp. 159-161
Author(s):  
Sergei I. Genkal
Keyword(s):  
Morphological Variability ◽  
Systematic Position ◽  
Published Data

Based on the original and published data, it is suggested to refer Pantocsekiella rossii to the synonymy of Pantocsekiella chantaica and extend the diagnosis of the latter.

Morphological Variability of Some Bacillariophyta Species of the Genus Kobayasiella Lange-Bertalot (Raphales, Naviculaceae)

2019 ◽  
Vol 21 (4) ◽  
pp. 311-320
Author(s):  
S. I. Genkal ◽  
D. A. Kapustin ◽  
A. S. Stenina ◽  
I. N. Sterlyagova ◽  
Yu. N. Shabalina
Keyword(s):  
Morphological Variability

On the morphological variability of Navicula schmassmannii (Bacillariophyta)

2010 ◽  
Vol 44 ◽  
pp. 32-38 ◽  
Author(s):  
S. I. Genkal ◽  
W. G. Kharitonov
Keyword(s):  
Morphological Variability ◽  
Central Area ◽  
Diatom Species ◽  
Species Diagnosis ◽  
Wide Variability ◽  
Ultraoligotrophic Lake

On the basis of the studied materials from the ultraoligotrophic lake Elgygytgyn (Chukotka), a rare for the flora of Russia diatom species Navicula schmassmannii was recorded. In the studied populations of the species a wide variability of morphological quantitative (valve length and width, the number of stria in 10 μm) and qualitative (the shape of the valve and the central area) features was marked. It made the basis for emending of the species diagnosis.

Impaired Swimming Performance of Acid-exposed Arctic Charr, Salvelinus Alpinus L.

1988 ◽  
Vol 23 (2) ◽  
pp. 301-307 ◽  
Author(s):  
L.A. Hunter ◽  
E. Scherer
Keyword(s):  
Dose Response ◽  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Swimming Performance ◽  
Control Level ◽  
Ventilation Rates

Abstract Arctic charr (Salvelinus alpinus L.) were exposed to five levels of acidity between pH 6 and pH 3.8. Swimming performance as determined by critical swimming speeds was 67.5 cm · sࢤ1 or 4.4 body lengths per second for untreated fish (pH 7.8). Performance declined sharply below pH 4.5; at pH 3.8 it was reduced by 35% after 7 days of exposure. Tailbeat frequencies and ventilation rates showed no dose-response effects. At swimming speeds between 20 and 50 cm · sࢤ1, ventilation rates at all levels of acidity were higher than at the control level.

scholarly journals A seasonal comparison of trace metal concentrations in the tissues of Arctic charr (Salvelinus alpinus) in Northern Québec, Canada

Ecotoxicology ◽  
2020 ◽  
Vol 29 (9) ◽  
pp. 1327-1346
Author(s):  
Mackenzie Anne Clifford Martyniuk ◽  
Patrice Couture ◽  
Lilian Tran ◽  
Laurie Beaupré ◽  
Nastassia Urien ◽  
...  
Keyword(s):  
Trace Metal ◽  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Metal Concentrations

The role of immersion learning in the acquisition and processing of L2 gender agreement

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Gabrielle Klassen ◽  
Aline Ferreira ◽  
John W. Schwieter
Keyword(s):  
Second Language ◽  
Second Language Acquisition ◽  
Study Abroad ◽  
Morphological Variability ◽  
Selection Task ◽  
Gender Agreement ◽  
Short Term ◽  
Term Study ◽  
Reading Task ◽  
Short Term Study

Abstract In this paper, we examine the effects of learning environment on second language (L2) gender agreement. English speakers learning L2 Spanish participated in a self-paced reading task and a picture selection task prior to and after a short-term study abroad experience. The results from the self-paced reading task showed that their reliance on the masculine article as the default (e.g., McCarthy, Corrine. 2008. Morphological variability in the comprehension of agreement: An argument for representation over computation. Second Language Research 24(4). 459–486) was reduced over time abroad. Findings from the picture selection task showed that the learners did not attend to the gender of articles unless it was their only cue, but that after the study abroad experience they began to use gender as an anticipatory cue for lexical selection. We interpret these results as support for an adapted version of the Shallow Structures Hypothesis (Clahsen, Harald & Claudia Felser. 2006a. Grammatical processing in language learners. Applied Psycholinguistics 27(1). 3–42; Clahsen, Harald & Claudia Felser. 2006b. How native-like is non-native language processing? Trends in Cognitive Sciences 10(12). 564–570) and the notion that in immersion contexts L2 learners shift their parsing strategy to be more communicatively focused (Schwieter, John W. & Gabrielle Klassen. 2016. Linguistic advances and learning strategies in a short-term study abroad experience. Study Abroad Research in Second Language Acquisition and International Education 1(2). 217–247).

scholarly journals First experience with augmented reality neuronavigation in endoscopic assisted midline skull base pathologies in children

2021 ◽  
Author(s):  
Valentina Pennacchietti ◽  
Katharina Stoelzel ◽  
Anna Tietze ◽  
Erwin Lankes ◽  
Andreas Schaumann ◽  
...  
Keyword(s):  
Augmented Reality ◽  
Skull Base ◽  
Skull Base Surgery ◽  
Morphological Variability ◽  
Case Series ◽  
Relevant Information ◽  
Navigation Systems ◽  
Postoperative Mri ◽  
The Mean ◽  
Clinical Conditions

Abstract Introduction Endoscopic skull base approaches are broadly used in modern neurosurgery. The support of neuronavigation can help to effectively target the lesion avoiding complications. In children, endoscopic-assisted skull base surgery in combination with navigation systems becomes even more important because of the morphological variability and rare diseases affecting the sellar and parasellar regions. This paper aims to analyze our first experience on augmented reality navigation in endoscopic skull base surgery in a pediatric case series. Patients and methods A retrospective review identified seventeen endoscopic-assisted endonasal or transoral procedures performed in an interdisciplinary setting in a period between October 2011 and May 2020. In all the cases, the surgical target was a lesion in the sellar or parasellar region. Clinical conditions, MRI appearance, intraoperative conditions, postoperative MRI, possible complications, and outcomes were analyzed. Results The mean age of our patients was 14.5 ± 2.4 years. The diagnosis varied, but craniopharyngiomas (31.2%) were mostly represented. AR navigation was experienced to be very helpful for effectively targeting the lesion and defining the intraoperative extension of the pathology. In 65% of the oncologic cases, a radical removal was proven in postoperative MRI. The mean follow-up was 89 ± 79 months. There were no deaths in our series. No long-term complications were registered; two cerebrospinal fluid (CSF) fistulas and a secondary abscess required further surgery. Conclusion The implementation of augmented reality to endoscopic-assisted neuronavigated procedures within the skull base was feasible and did provide relevant information directly in the endoscopic field of view and was experienced to be useful in the pediatric cases, where anatomical variability and rarity of the pathologies make surgery more challenging.

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