Morphology and phylogenetic relationships of a remarkable new genus and two new species of Neotropical freshwater stingrays from the Amazon basin (Chondrichthyes: Potamotrygonidae)

The morphology and phylogenetic relationships of a new genus and two new species of Neotropical freshwater stingrays, family Potamotrygonidae, are investigated and described in detail. The new genus, Heliotrygon, n. gen., and its two new species, Heliotrygon gomesi, n. sp. (type-species) and Heliotrygon rosai, n. sp., are compared to all genera and species of potamotrygonids, based on revisions in progress. Some of the derived features of Heliotrygon include its unique disc proportions (disc highly circular, convex anteriorly at snout region, its width and length very similar), extreme subdivision of suborbital canal (forming a complex honeycomb-like pattern anterolaterally on disc), stout and triangular pelvic girdle, extremely reduced caudal sting, basibranchial copula with very slender and acute anterior extension, and precerebral and frontoparietal fontanellae of about equal width, tapering very little posteriorly. Both new species can be distinguished by their unique color patterns: Heliotrygon gomesi is uniform gray to light tan or brownish dorsally, without distinct patterns, whereas Heliotrygon rosai is characterized by numerous white to creamy-white vermiculate markings over a light brown, tan or gray background color. Additional proportional characters that may further distinguish both species are also discussed. Morphological descriptions are provided for dermal denticles, ventral lateral-line canals, skeleton, and cranial, hyoid and mandibular muscles of Heliotrygon, which clearly corroborate it as the sister group of Paratrygon. Both genera share numerous derived features of the ventral lateral-line canals, neurocranium, scapulocoracoid, pectoral basals, clasper morphology, and specific patterns of the adductor mandibulae and spiracularis medialis muscles. Potamotrygon and Plesiotrygon are demonstrated to share derived characters of their ventral lateral-line canals, in addition to the presence of angular cartilages. Our morphological phylogeny is further corroborated by a molecular phylogenetic analysis of cytochrome b based on four sequences (637 base pairs in length), representing two distinct haplotypes for Heliotrygon gomesi. Parsimony analysis produced a single most parsimonious tree revealing Heliotrygon and Paratrygon as sister taxa (boot-strap proportion of 70%), which together are the sister group to a clade including Plesiotrygon and species of Potamotrygon. These unusual stingrays highlight that potamotrygonid diversity, both in terms of species composition and undetected morphological and molecular patterns, is still poorly known.

Comparative Internal Structure of Dorsal Lips and Radiolar Appendages in Sabellidae (Polychaeta) and Phylogenetic Implications

Fan worms (Sabellidae) possess paired modified prostomial structures at the base of the radiolar crown, dorso-lateral to the mouth, called dorsal lips. The dorsal lips are involved in the sorting of particles collected by the radiolar crown. The range of variation in the morphology of dorsal lips is extensive, and probably this is not only due to adaptations to different environments and feeding preferences but also due to phylogenetic constraints. In this study, we describe and compare the morphology of dorsal lips in a range of sabellid taxa based on histological cross-sections of these structures, and compare our data and terminology with those of previous studies. Dorsal lips are maintained erect in most taxa by a modified radiole fused to them known as dorsal radiolar appendage. We suggest that dorsal radiolar appendages with an internal supporting axis (cellular or acellular) and probably also the ventral lips are synapomorphies of the family. J. Morphol. 272: 302-319, 2011. (C) 2010 Wiley-Liss, Inc.

Quantitative structure-activity relationships for a series of inhibitors of cruzain from Trypanosoma cruzi: Molecular modeling, CoMFA and CoMSIA studies

Human parasitic diseases are the foremost threat to human health and welfare around the world. Trypanosomiasis is a very serious infectious disease against which the currently available drugs are limited and not effective. Therefore, there is an urgent need for new chemotherapeutic agents. One attractive drug target is the major cysteine protease from Trypanosoma cruzi, cruzain. In the present work, comparative molecular field analysis (CoMFA) and comparative molecular similarity indices analysis (CoMSIA) studies were conducted on a series of thiosemicarbazone and semicarbazone derivatives as inhibitors of cruzain. Molecular modeling studies were performed in order to identify the preferred binding mode of the inhibitors into the enzyme active site, and to generate structural alignments for the three-dimensional quantitative structure-activity relationship (3D QSAR) investigations. Statistically significant models were obtained (CoMFA. r(2) = 0.96 and q(2) = 0.78; CoMSIA, r(2) = 0.91 and q(2) = 0.73), indicating their predictive ability for untested compounds. The models were externally validated employing a test set, and the predicted values were in good agreement with the experimental results. The final QSAR models and the information gathered from the 3D CoMFA and CoMSIA contour maps provided important insights into the chemical and structural basis involved in the molecular recognition process of this family of cruzain inhibitors, and should be useful for the design of new structurally related analogs with improved potency. (C) 2009 Elsevier Inc. All rights reserved.

Chemotaxonomic relationships in Celastraceae inferred from principal component analysis (PCA) and partial least squares (PLS)

This paper describes a chemotaxonomic analysis of a database of triterpenoid compounds from the Celastraceae family using principal component analysis (PCA). The numbers of occurrences of thirty types of triterpene skeleton in different tribes of the family were used as variables. The study shows that PCA applied to chemical data can contribute to an intrafamilial classification of Celastraceae, once some questionable taxa affinity was observed, from chemotaxonomic inferences about genera and they are in agreement with the phylogeny previously proposed. The inclusion of Hippocrateaceae within Celastraceae is supported by the triterpene chemistry.

Small businesses as social formations : diverse rationalities in the context of e-business adoption

Small-business adoption of electronic business has been analyzed largely in conventional business terms such as benefits and costs, returns on investment, and competitive advantage. While these factors are important, small businesses are also embedded in social contexts which shape the rationalities with which they approach e-business. These rationalities are different from those that characterize larger businesses. They involve personal relationships, social esteem, lifestyle issues, and family considerations. Drawing on the theoretical work of Granovetter and Weber, this chapter examines interview data from a number of Australian studies of e-commerce by small businesses. These interviews illustrate the influence of the social context on the adoption (or deferral) of e-commerce. By recognizing that small businesses are social as well as economic formations, governments can tailor their programs to assist this important group of businesses in their approach to e-business.

Generational and cultural indicators of technology and innovation in family business

The internet revolution has affected everybody in some way. Technologies used in business range from telephones to industry-specific machinery. Mostly though, business technology has come to mean the internet. In literature concerning innovation and the adoption of technology in business, research invariably centres on small to medium businesses (SI'v1Es), as these can be defined reasonably easily. Statistics on family businesses are limited, however, because family businesses are so difficult to categorize and define.

The Australian Family Business Survey of 1993 (Institute of Chartered Accountants) determined that family business is the largest form of business ownership in Australia and represents 83% of all business enterprises, although Basu (2004) believes that over two thirds of all world-wide businesses are owned or managed by families and around half of all businesses in Australia are family businesses. The Australian Institute of Management (AIM) (2004) states that the wealth of family and private businesses is estimated at $3.6 trillion and that family firms generate 50 per cent of Australia's employment growth, account for 40 per cent of Australia's private sector output, and are a seed bed for innovation and the information of large companies.

The difficulty in defining a family business is heightened because family businesses can take many forms ranging from sole traders to private companies to public companies. Hence, when talking about family business, you could be referring to the sole trader dealing with organic produce to an IT organisation employing hundreds of staff. Basu (2004) thinks that while ordinarily, in non-family businesses, the business and family domains remain separate, the key distinctive characteristic of family businesses is that family members work together for economic purposes. In other words, the family is not merely a social unit but also an economic unit. Craig and Lindsay (2002) believe that family involvement in the business is what makes the family business different... researchers, however, cannot seem to agree as to what constitutes 'family involvement' in a business so that it can be defined as a family business and that family business is ... a business that is governed and/or managed with the intention to shape and pursue the vision of the business held by a dominant coalition that is controlled by members of the same family or a small number of families in a manner that is potentially sustainable across generations of the family or families.

Kokusaika and Internationalisation: Australian and Japanese sister city type relationships

Sister city type relationships at local government level form an important part of Australian-Japanese relations. The original concept of sister cities was to increase international understanding and peace at local level. Over the years, that concept has changed and there is now a robust debate over the inclusion of commercial exchanges into sister city type relationships. This article describes the context of this debate by analysing the different perceptions of sister city type relationships in Australia and Japan. It begins with a discussion of the public policy contexts of sister cities in both Australia and Japan. The second section deals with an analysis of the results of surveys in Australia and Japan. Finally, case studies of two important issues related to SCTRs are discussed: economic and business relations and community involvement. The article concludes by suggesting that sister city type relationships between Australia and Japan are dependent upon the over-arching public policy contexts and sometimes lead to mismatched expectations between the two countries.

Are married couples happier in their relationships than cohabiting couples? Intimacy and relationship factors

This study was designed to examine the relationship between dyadic adjustment and intimacy, and to determine how this varies for different types of relationships between males and females, and for relationships of different duration. Eighty-seven heterosexual couples (10 dating, 21 living together, 56 married) participated in the study. The results demonstrated that there was a strong interrelationship between intimacy and dyadic adjustment for both males and females. Those in relationships of longer duration and married couples experienced higher levels of intimacy and relationship satisfaction than other couples. There was a general trend for married couples and those who were living together to have a higher level of agreement on their levels of intimacy and relationship adjustment than couples who were dating. The implication of these findings for obtaining a better understanding of the lifecycle of relationships is discussed.

Family food environments as determinants of preschool-aged children`s eating behaviours: implications for obesity prevention policy. A review.

Children's eating behaviours are fundamental to their health. Dietary surveys indicate that children's food consumption is likely to promote a range of diet-related diseases, including overweight and obesity, which are associated with a range of psychosocial and physical disorders. With the prevalence of overweight and obesity rapidly increasing, opportunities for informed prevention have become a focus of strategy. Diet is recognised as important in the genesis of obesity. We present data that demonstrate that eating behaviours are likely to be established early in life and may be maintained into adulthood. We review literature that shows that children's eating behaviours are influenced by the family food environment. These findings suggest that the family environment should be considered in developing obesity prevention strategy for children, yet the current strategy focuses primarily on the school environment. Those factors in the family environment that appear to be important include: parental food preferences and beliefs, children's food exposure; role modelling; media exposure; and child-parent interactions around food. However, the existing data are based on small scale and unrepresentative US samples. At a population level, we have few insights regarding family food environments and consequently little information about how such environments influence children's eating behaviours and thus their risk for obesity. We suggest research that may promote a better understanding of the role of family food environments as determinants of children's eating behaviour, and consider the implications for obesity prevention in Australia. (Aust J Nutr Diet 2001;58:19-25)

The importance of Sino-Australian sister city type relationships in regional development

Using the Jiangsu-Victoria and Greater Green Triangle-Yangzhou relationships as case studies this paper provides an initial analysis of the origins, objectives, achievements, and limitations of SinoAustralian Sister City Type Relationships. Based on research to date, we suggest that certain factors, including the development of inappropriate SCTRs have seriously limited the capacity of these relationships to achieve their stated and unstated regional development objectives. After reviewing the recent history and perceived effectiveness of Sino Australian SCTRs. the paper concludes by commenting on the potential of such relationships to contribute to economic and cultural development in regional Australia.

The relationships between migration, social support and social integration on quality of Life

Past research indicates that humans have a remarkable ability to maintain normal levels of subjective wellbeing despite adverse objective circumstances. This suggests that such wellbeing may be held under homeostatic control. This paper investigates some of the potential factors
that may contribute to this homeostatic mechanism, in response to the major life event of migration. Three groups were examined: Persian immigrants to Australia (Persian- Australians), non-Persian Australians, and Persians residing in Iran. A total of 330 subjects were recruited. A notable finding was that all three groups did not differ in regard to subjective wellbeing, despite the Persian-Australians being a minority ethnic group in Australia, and the Persians having significantly lower objective life quality. The Persian-Australians who migrated at an older age reported lower subjective quality of life, while the number of years of residence in Australia did not appear to be related to the extent of social integration. Subjective life quality was, however, related to subjective social support for the Australian and Persian samples, and to reciprocality of support for the Persian-Australians.

Calescharidae, a new family for the Tertiary to Recent Genera Caleschara MacGillivray and Tretosina Canu and Bassler (Bryozoa: Cheilostomata)

A new family of Cheilostomata, the Calescharidae, is introduced for the genus Caleschara MacGillivray and its Recent Australian typespecies, C. denticulata(MacGillivray), which is redefined from type and other material. The Australian Tertiary genus Tretosina Canu & Bassler and its type species,T. arcifera Canu & Bassler, are closely related,and are also assigned to the Calescharidae. The history and significance of family attributions of both genera are outlined, and RecentC. denticulata from Australian and other localities is distinguished from the Late Tertiary Victorian species C. parva Maplestone. Caleschara lithconis, sp. nov., from the Late Eocene of Victoria is one of the earliest known species: its morphology closely resembles a Recent form from the Philippines, C. junctifera Canu & Bassler. Another Recent species, Caleschara minuta (Maplestone) from the GilbertIslands, is a senior synonym of three other Indo-Pacific species,C. levinseni Harmer, C. laxa Canu & Bassler and Floridinella arculifera Canu & Bassler, and resembles the European Paleocene C. squamosa. Three other related species are briefly discussed. Close relationships to other families are problematic and are discussed; divergence in the early history of the cheilostomes is inferred.

Is it only 'what works' that 'counts' in new knowledge economies? Evidence-based practice, educational research and teacher education in Australia

Recent texts on globalisation and education policy refer to the rapid flow of education policy texts producing or responding to common trends across nation states with the emergence of new knowledge economies. These educational policies are shaping what counts as research and the dynamics between research, policy, and practice in schools, creating new types of relationships between universities, the public, the professions, government, and industry. The trend to evidence-based policy and practice in Australian schools is used to identify key issues within wider debates about the ‘usefulness’ of educational research and the role of universities and university-based research in education in new knowledge economies.

A preliminary study of 16S rRNA sequence variation in Australia Macrobrachium shrimps (Palaemonidae: Decapoda) reveals inconsistencies in their current classification

The systematic relationships among Australian palaemonid shrimps have been the subject of speculation for some time. A preliminary phylogenetic study was undertaken to clarify the relationships of five species, Macrobrachium intermedium (Stimpson), M. australiense (Holthuis), M. atactum (Riek), M. rosenbergii (de Man) and Palaemon serenus (Heller), using 16S rRNA mitochondrial gene sequences. Phylogenetic analyses indicated inconsistencies with the current classification in two respects. First, M. intermedium formed a very well-supported clade with P. serenus distinct from M. australiense, M. atactum and M. rosenbergii. Second, the two species from inland Australia, M. australiense and M. atactum, showed a high level of genetic similarity over a substantial geographic range, suggesting that they may represent conspecific populations. The taxonomic and biogeographic implications of these findings for Macrobrachium in Australia are discussed.