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| Registros recuperados: 375 | |
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| Baracho,MS; Nääs,IA; Bueno,LGF; Nascimento,GR; Moura,DJ. |
| Morphological asymmetry has been described as a potential broiler welfare indicator, for interpreting the birds' ability to cope with the challenges that may affect its growth. The objective of this study was to evaluate the use of morphological asymmetry data to estimate broiler walking ability and welfare.dBroilers werefed diets supplemented or not with vitamin D. Toes were measured when birds were 42 and 49 days old using digital caliper.the left and right sides of the following four bilateral traits (tarsometatarsus length, outer toe length, mid toe length, and back toe length) were measured twice on intact alive birds by two different researcherh. Data from right and left sides were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Asymmetry; Welfare; Poultry. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2012000300009 |
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| Russo,Priscilla Perez; Smith,Ricardo Luiz. |
| Knowledge about human skull asymmetry in normal dry specimens is useful as a parameter for medical and dentistry practice. Skull base was investigated with the objective to validate the method of indirect measurement with digital pictures and to evaluate the degree of asymmetry from human skull base in different ages. We analyzed 176 normal identified human skulls, divided by age in the following groups: Fetuses, newborn, children and adults. Measures were taken from a central point: pharyngeal tubercle and 4 lateral points: foramen ovale, foramen spinosum, carotid canal and stylomastoid foramen using digital biometry after a comparative validation with directed method performed with... |
| Tipo: Journal article |
Palavras-chave: Anatomy; Asymmetry; Growth; Skull. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300062 |
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| Özgül-Siemund, A.; Ahrens, D.. |
| Female genitalia are widely underrepresented in taxonomic studies. Here we investigate the morphological variation among female copulation organs for a group of scarab beetles (Sericini) with similar ecology, external morphology and copulation mechanics. We examined traits qualitatively and quantitatively based on 80 and 18 species (genus Pleophylla), respectively. Additionally we explored whether female genitalia are affected by asymmetry. The vast diversity of slerotised structures including their shapes illustrated the high taxonomic and phylogenetic utility of female genitalia in this group. The morphometric analysis of Pleophylla, confirmed that sclerotisations in the ductus bursae are very suitable for species-level... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Beetles; Female genitalia; Integrative taxonomy; Melolonthinae; Morphology; 42.75; 42.64; 42.62. |
| Ano: 2015 |
URL: http://www.repository.naturalis.nl/record/579124 |
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| Daouk, Hazem; Ng, David T.C.. |
| Asymmetric volatility refers to the stylized fact that stock volatility is negatively correlated to stock returns. Traditionally, this phenomenon has been explained by the financial leverage effect. This explanation has recently been challenged in favor of a risk premium based explanation. We develop a new, unlevering approach to document how well financial leverage, rather than size, beta, book-to-market, or operating leverage, explains volatility asymmetry on a firm-by-firm basis. Our results reveal that, at the firm level, financial leverage explains much of the volatility asymmetry. This result is robust to different unlevering methodologies, samples, and measurement intervals.... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Volatility asymmetry; Financial leverage; Financial Economics; Research Methods/ Statistical Methods; G12. |
| Ano: 2009 |
URL: http://purl.umn.edu/51182 |
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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... |
| 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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| Moura,Renan Fernandes; Alves-Silva,Estevão; Del-Claro,Kleber. |
| ABSTRACT Plant development is influenced by several abiotic factors, which in turn influence morphological traits and life history. We investigated whether leaf area, herbivory, toughness, fluctuating asymmetry, structural complexity and the number of inflorescences of Palicourea rigida are influenced by sun/shade conditions or by Cerrado phytophysiognomy (typical cerrado or rupestrian field). We expected to find greater structural complexity, leaf toughness and more inflorescences in sun plants; shaded plants were expected to exhibit a greater degree of fluctuating asymmetry (an index of plant stress), reduced leaf toughness and greater herbivory. As for phytophysiognomies, we expected to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brazilian savanna; Environmental stress; Fluctuating asymmetry; Leaf area loss; Rubiaceae; Rupestrian grassland. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000200286 |
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| Venâncio,Henrique; Alves-Silva,Estevao; Santos,Jean Carlos. |
| ABSTRACT For pioneer plants, shaded habitats represent a stressful condition, where sunlight exposure is below the optimum level and so leaves expand in order to intercept a greater amount of light. We investigated changes in both phenotypic variation and stress of Bauhinia brevipes in sunny and shaded microhabitats. Leaf area was used as a measure of phenotypic variation, whereas leaf asymmetry (difference between right and left sides of leaves), was used as a measure of stress. We hypothesized an increase in leaf area and stress in shaded locations, which might indicate that B. brevipes was compensating for low light absorption, and elevated levels of stress, respectively. Plants in the sun fitted a fluctuating |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antisymmetry; Bauhinia brevipes; Fluctuating asymmetry; Leaf morphometry; Sunlight exposure. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000200296 |
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| Nääs,Irenilza de A.; Baracho,Marta dos S.; Salgado,Douglas D.; Sonoda,Lilia T.; Carvalho,Victor R. C.; Moura,Daniella J. de; Paz,Ibiara C. L. A.. |
| Brazilian poultry production nowadays occupies important position in world's economy due to its technological advancement, which associated to the development of genetic strains of high growth may cause deviation in the growth rate and harm production. Morphological asymmetry has been pointed as an indicator of welfare, as maintained the pattern that leads to balance, the broiler chicken would have its normal locomotion characteristics, freely reaching water and feed. Thus, the objective of this research was to verify the possibility of using morphological asymmetry for evaluating walking ability of broiler chicken. The research was done in the Technology Center, at UNICAMP. The experiment... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Animal welfare; Biomechanics; Morphological asymmetry. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162009000400004 |
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| Lindgren, Georg; Prevosto, Marc. |
| Water particle orbits are key elements in the Lagrange wave formulation. The stochastic Miche implementation of the Lagrange model is a linear Gaussian two-dimensional or three-dimensional space-time model which exhibits typical nonlinear wave characteristics when transformed to Eulerian coordinates. This paper investigates the statistical relation between the degree of front-back asymmetry of individual waves and the orbit orientation for the particle located at the wave maximum at the point of observation. It is shown that, in the Lagrangian model with statistical front-back symmetry, for individual waves there is a clear connexion between the degree of individual wave asymmetry and the... |
| Tipo: Text |
Palavras-chave: Computational methods; Surface gravity waves; Ocean processes. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00658/76986/78255.pdf |
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| Nuket Gocmen-Mas,H; Karabekir,Selim; Yilmaz Kusbeci,Ozge; Sahin,Bunyamin; Ertekin,Tolga; Bas,Orhan; Canan Yazici,A; Senan,Sevda. |
| We aimed to evaluate the relevant methods of stereology to estimate hemicerebellar asymmetry according to sex in both adult right handed vertigo cases and comparing with healthy cases. The study included 14 adult control subjects and 18 patients with vertigo. The volumes of the cerebellar hemispheres were determined by MRI using the point-counting approach of stereological methods. The mean (±SD) of the right cerebellar hemispheres in the patients with vertigo were 52.49±5.42 cm3 in males, 50.11±4.02 cm3 in females. The mean (±SD) of the left cerebellar hemispheres in the patients with vertigo were 53.11±3.70 cm3 in males, 49.73±4.69 cm3 in females. There was not significant quantitative evidence detected in terms of... |
| Tipo: Journal article |
Palavras-chave: Cavalier principle; Stereology; Hemicerebellar asymmetry; Magnetic resonance imaging; Vertigo. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200048 |
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| Olate,Sergio; Cantín,Mario; Muñoz,Mariela; Vásquez,Bélgica. |
| The aim of this study was to determine the relations between hard and soft tissues in subjects with facial asymmetry. Included were subjects aged between 15 and 35 years who presented a chin deviation greater than 5 mm from the midline and a unilateral posterior crossbite. Cone beam computed tomography was used to determine the measurements, positioning them on the three spatial planes; then, 5 bilateral bone points were selected on the coronal image, and parallel measurements were taken to determine the range between the bone point and the most lateral soft tissue point. The statistical analysis was done using the Shapiro-Wilk test, presenting normality in the sample distribution and Levene's test, considering a value of... |
| Tipo: Journal article |
Palavras-chave: Facial asymmetry; Facial analysis; Soft tissues. |
| Ano: 2016 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000300039 |
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| Urbanová,Petra; Hejna,Petr; Zátopková,Lenka; Safr,Miroslav. |
| Morphological variation is a result of interplay among multiple intervening factors. For hyoid bones, the shape and size differences have been scarcely covered in the literature and in majority limited to studies of sexual dimorphism or age dependency. To our knowledge, the human hyoid bone, in complete opposite to other cranial bones, has not been fully utilized to address development questions in terms of asymmetry or modularity. In the present paper, we used landmark-based methods of geometric morphometrics and multivariate statistical approach to study human hyoid morphology represented by the hyoid body and greater horns in a sample of 211 fused and non-fused bones. Within a sample variation analysis, we showed that... |
| Tipo: Journal article |
Palavras-chave: Hyoid bone; Asymmetry; Modularity; Geometric morphometrics. |
| Ano: 2014 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000100042 |
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| Registros recuperados: 375 | |
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