Consulta: subjectFacets:"Chirality"
Registros recuperados: 8
Data/hora: 15/06/2024 19:00:37

02src009
Provedor de dados: 8
Autores: Butts, Craig; Horton, Peter N.; Hursthouse, Michael B.
Tipo: Crystal Structure Data Holding
Palavras-chave: C~12~H~19~BrN~2~O; Organic; Chirality; Heterocycles.
Ano: 2002
URL: http://ecrystals.chem.soton.ac.uk/946/

The Euclidean Steiner Ratio and the measure of chirality of biomacromolecules
Provedor de dados: 74
Autores: 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

Sexual selection maintains whole-body chiral dimorphism in snails
Provedor de dados: 16
Autores: Schilthuizen, M.; Craze, P.G.; Cabanban, A.S.; Davison, A.; Stone, J.; Gittenberger, E.; Scott, B.J.
Tipo: Article / Letter to the editor
Palavras-chave: Amphidromus; Balanced polymorphism; Chirality; Gastropoda; Malaysia; 42.73.
Ano: 2007
URL: http://www.repository.naturalis.nl/record/226754

Evolutionary patterns of asymmetric genitalia in the beetle tribe Cyclocephalini (Coleoptera: Scarabaeidae: Dynastinae)
Provedor de dados: 16
Autores: Breeschoten, T.; Clark, D.R.; Schilthuizen, M.
The evolution of asymmetric genitalia is a common and recurrent phenomenon in a wide variety of insect taxa. However, little is understood about the evolution of left-right asymmetry in reproductive structures. Since a better knowledge of it could have an important impact on the study of genital evolution, in the present study we investigate the phylogenetic and evolutionary patterns of asymmetric male genitalia in Cyclocephalini. We use a Procrustes distance based method for quantifying asymmetry. Analysis of 119 species belonging to 14 genera revealed a diverse array of asymmetries with a strong indication that asymmetries are more strongly developed in the terminal part of the aedeagus. Further, we find that asymmetries have evolved repeatedly within...
Tipo: Article / Letter to the editor
Palavras-chave: Chirality; Left-right asymmetry; Micro-CT scanning; Morphometrics; Procrustes distance; 42.75.
Ano: 2013
URL: http://www.repository.naturalis.nl/record/447985

How do the molluscivorous beetles Carabus granulatus and Phosphuga atrata (Insecta, Coleoptera) deal with sinistral and dextral prey?
Provedor de dados: 16
Autores: 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

Something gone awry: unsolved mysteries in the evolution of asymmetric animal genitalia
Provedor de dados: 16
Autores: 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

Left-right asymmetry in plants and animals: a gold mine for research
Provedor de dados: 16
Autores: 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

S-(+)- and R-(-)-linalool: a comparison of the in vitro anti-Aeromonas hydrophila activity and anesthetic properties in fish
Provedor de dados: 42
Autores: 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