Literature Review Shows (literature + review_shows)

Distribution by Scientific Domains


Selected Abstracts


Pai syndrome: First patient with agenesis of the corpus callosum and literature review

BIRTH DEFECTS RESEARCH, Issue 10 2007
Marco Castori
Abstract BACKGROUND: Pai syndrome (PS) is a rare regional developmental defect of the face, mainly characterized by the variable association of midline cleft of the upper lip (MCL), duplicated maxillary median frenulum, and midline facial cutaneous and midanterior alveolar process polyps. Its entire clinical spectrum is still poorly delineated and the etiology remains unknown. CASE: We describe a 1-month-old boy presenting with MCL, left nostril hamartomatous mass, midline pedunculated polyp originating from the columella base, midline alveolar cleft, duplication of the upper median frenulum, unilateral persistent papillary membrane, lipoma of the corpus callosum, and additional minor facial dysmorphism. This patient also presents with agenesis of the corpus callosum, which has never been reported in PS. Literature review was carried out comparing clinical data of the 20 previously published patients with those observed in the present case. CONCLUSIONS: The minimum diagnostic criteria for PS has been fixed in one or more hamartomatous nasal polyps plus MCL (with or without cleft alveolus) and/or midanterior alveolar process congenital polyp. Additional common ancillary findings include duplicated median maxillary frenulum, hypertelorism, nasal cleft, midfrontal skin tags, and ocular and CNS structural abnormalities. However, mental retardation is only an occasional feature and seems to be related to coexisting conditions (such as chromosome imbalance). Literature review shows that PS is etiologically heterogeneous, as it may result from chromosome abnormalities and environmental/stochastic events, as well as de novo mutations. Birth Defects Research (Part A) 2007. © 2007 Wiley-Liss, Inc. [source]


HERITABILITY OF AND EARLY ENVIRONMENT EFFECTS ON VARIATION IN MATING PREFERENCES

EVOLUTION, Issue 4 2010
Holger Schielzeth
Many species show substantial between-individual variation in mating preferences, but studying the causes of such variation remains a challenge. For example, the relative importance of heritable variation versus shared early environment effects (like sexual imprinting) on mating preferences has never been quantified in a population of animals. Here, we estimate the heritability of and early rearing effects on mate choice decisions in zebra finches based on the similarity of choices between pairs of genetic sisters raised apart and pairs of unrelated foster sisters. We found a low and nonsignificant heritability of preferences and no significant shared early rearing effects. A literature review shows that a low heritability of preferences is rather typical, whereas empirical tests for the relevance of sexual imprinting within populations are currently limited to very few studies. Although effects on preference functions (i.e., which male to prefer) were weak, we found strong individual consistency in choice behavior and part of this variation was heritable. It seems likely that variation in choice behavior (choosiness, responsiveness, sampling behavior) would produce patterns of nonrandom mating and this might be the more important source of between-individual differences in mating patterns. [source]


Unsupervised classification methods in food sciences: discussion and outlook

JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE, Issue 7 2008
Marcin Kozak
Abstract This paper reviews three unsupervised multivariate classification methods: principal component analysis, principal component similarity analysis and heuristic cluster analysis. The theoretical basis of each method is presented in brief, and assumptions inherent to the methods are highlighted. A literature review shows that these methods have sometimes been used inappropriately or without referencing all essential parameters. The paper also brings to the attention of the reader a relatively unknown method: probabilistic or model-based cluster analysis. The goal of this method is to uncover the true classification of objects rather than a convenient classification provided by the other methods. For this reason it is felt that model-based cluster analysis will have broad application in the future. Copyright © 2008 Society of Chemical Industry [source]


Rationalist and Constructivist Perspectives on Reputation

POLITICAL STUDIES, Issue 1 2007
J. C. Sharman
This article argues for a new and broader understanding of reputation as a generally shared belief concerning a referent's character or nature, based on a range of information, associations and social cues. This is in place of the conventional rationalist definition of this concept as the degree to which an actor reliably upholds its commitments, based on a record of past behaviour. A brief literature review shows that this concept is crucial in underpinning a wide range of work in political science and economics premised on strategic interaction. The difference between a rationalist and constructivist understanding of reputation hinges on three points. Firstly, reputation is argued to be a relational concept rather than a property concept. Secondly, reputation is a social fact with an emergent, intersubjective quality, not just a collection of individual beliefs. Thirdly, rather than being an inductively derived objective record of past behaviour, reputation is based on associations, feelings and social cues. The last section of the article applies this broader conceptual understanding to two empirical examples: the importance of international organisations' reputation for their influence over policy-makers, and the way in which small states are classified as tax havens by a reputation test. [source]


Supernumerary tooth with associated dentigerous cyst in an infant.

AUSTRALIAN DENTAL JOURNAL, Issue 2 2007
A case report, review of differential diagnosis
Abstract This paper reviews the topic of dental structures present at birth or erupting prior to the deciduous incisor teeth. A literature review shows a prevalence of one in every 2000 live births. At this rate of occurrence it is likely that the general dental practitioner may be called upon to offer advice. This review is supported by the presentation of an unusual case of a supernumerary maxillary incisor tooth with the hallmarks of a neonatal tooth and the development of a soft tissue dentigerous cyst. The differential diagnosis of soft and hard tissue swellings in infants is also presented together with rare syndromal associations of natal and neonatal teeth. [source]


Implications of an interpretive understanding of LCA practice

BUSINESS STRATEGY AND THE ENVIRONMENT, Issue 7 2008
Emma Rex
Abstract Despite the desirability of a life cycle perspective and many attempts to facilitate life cycle assessment (LCA), industry has been relatively slow to adopt LCA. In this research, we thus set out to investigate the underpinnings of LCA practice in industry. A literature review shows that the present understanding is that ,structural' conditions such as location and sector determine the use of LCA in industry. However, a field study of two companies in the Swedish forest product industry (thus in the same sector and country) indicates that LCA practice is shaped more by individual preferences and chance events. Our results imply a more interpretive understanding of LCA practice than has been put forward by previous research. The two types of understanding are discussed and their implications for practitioners in industry, organizations promoting the use of LCA and further research are presented. Copyright © 2008 John Wiley & Sons, Ltd and ERP Environment. [source]