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| Bergamin, Susan; Smits, Anne. |
| Predators of asymmetric prey (such as snails) are often asymmetric themselves or display a predation behaviour that is adapted to the asymmetry of their prey. We studied predation of sinistral and dextral forms of the freshwater snail Lymnaea stagnalis (Linnaeus, 1758) by two snail-feeding beetle species, Phosphuga atrata (Linnaeus, 1758) and Carabus granulatus Linnaeus, 1758. We investigated a possible preference for or more efficient predation of prey items with a certain coiling direction. We found that C. granulatus displayed a preference for dextral snails, as opposed to P. atrata, which did not show any preference. We also looked at the asymmetry of the mandibles. In C. granulatus the left mandible overlay the right one in a higher... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Carabidae; Silphidae; Lymnaea stagnalis; Molluscivory; Chirality; Predation; Behaviour; Mouth parts. |
| Ano: 2015 |
URL: http://www.repository.naturalis.nl/record/588051 |
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| Schilthuizen, M.; Gravendeel, B.. |
| Left-right asymmetry patterns in the body shapes of animals and plants have been a continuous source of interest among biologists. Recently, inroads have been made to developing a coherent research programme that makes use of the unique fact that chiral patterns may be studied (and generalities deduced) by comparisons across many unrelated groups, even across Kingdoms. The papers delivered at the symposium ‘Evolution of Chirality’ during the 2011 European congress of evolutionary biology (ESEB) provide examples of the various research programs that are currently developing within this field. The present paper provides a summary of the symposium, an introduction to this Special Issue of Contributions to Zoology, as well as suggestions for further... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Chirality; Development; Evolution; Evo-devo; 42.21. |
| Ano: 2012 |
URL: http://www.repository.naturalis.nl/record/419170 |
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| SILVA,LENISE L.; BALCONI,LUANA S.; GRESSLER,LETÍCIA T.; GARLET,QUELEN I.; SUTILI,FERNANDO J.; VARGAS,AGUEDA P. C.; BALDISSEROTTO,BERNARDO; MOREL,ADEMIR F.; HEINZMANN,BERTA M.. |
| ABSTRACT Linalool is the main compound of many essential oils and occurs in two isomeric forms: S-(+)- and R-(-)-linalool. This study aimed to determine if linalool isomers have different antimicrobial and anesthetic properties in fish. For this purpose, these compounds were previously isolated from Lippia alba (Mill.)N. E. Brown and Ocimum americanum L. essential oils. Antimicrobial effects were evaluated through the microdilution test against Aeromonas hydrophila, an important fish disease etiologic agent. Induction time until sedation, anesthesia and recovery time were determined in silver catfish (Rhamdia quelen) through bath exposure (60, 180, 300 or 500 μL L-1). The results showed different biological properties for the isomers being S-(+)-linalool... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anesthesia; Aeromonas hydrophila; Chirality; Linalool; Silver catfish.. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000100203 |
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| Schilthuizen, M.. |
| The great diversity in genital shape and function across and within the animal phyla hamper the identification of specific evolutionary trends that stretch beyond the limits of the group under study. Asymmetry might be a trait in genital morphology that could play a unifying role in the evolutionary biology of genitalia. Here, I review the current knowledge on the taxonomic distribution, phylogenetic patterns, genetics, development, and ecology of asymmetric (chiral) genitalia. Asymmetric genitalia (male as well as female) have evolved from bilaterally symmetric ones (and sometimes vice versa), innumerous times in most animal taxa with internal fertilisation, and especially in Platyhelminthes, Arthropoda, Nematoda, and Chordata. In groups with asymmetric... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Chirality; Development; Enantiomorphs; Morphology; Sexual selection; Symmetry; 42.73. |
| Ano: 2013 |
URL: http://www.repository.naturalis.nl/record/445874 |
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| Mondaini,R. P.. |
| The study of Euclidean Steiner Trees is one of the alternative methods to unveil Nature's plans for the internal architecture of biomacromolecules. Recently, the minimum surface structure of the A-DNA and of the Tobacco Mosaic Virus was shown to be described by a "strake" surface. These results have been substantiated by an explicit calculation of the Steiner Ratio Function in a very restrictive modelling scheme. In the present work, we also introduce the measure of chirality as an essential part of a thermodynamical approach to model biomolecular structure. In a certain sense, the Steiner Ratio function is constrained by the chirality measure to assume a value dictated by Nature. This value is a measure of the free energy of the molecular configuration. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Steiner Ratio; Chirality; Upper bound. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000400030 |
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