Showing papers by "La Trobe University published in 1997"

Syntax: Structure, Meaning, and Function

Abstract: This book is an introduction to syntactic theory and analysis which can be used for both introductory and advanced courses in theoretical syntax Offering an alternative to the standard generative view of the subject, it deals with the major issues in syntax with which all theories are concerned It presents syntactic phenomena from a wide range of languages and introduces students to the major typological issues that syntactic theories must address A generous number of exercises is included, which provide practice with the concepts introduced in the text and in addition expose the student to in-depth analysis of data from many languages Each chapter contains suggestions for further reading which encompass work from many theoretical perspectives A separate teaching guide is available

Influential passengers: inherited microorganisms and arthropod reproduction

Abstract: The evolution of heritable symbionts cytoplasmic incompatability in insects inherited microorganisms and sex determination of arthropod hosts wolbachia induced parthenogenesis cytoplasmic sex ratio distorters the potential application of inherited symbiont systems to pest control.

The rise and fall of languages

Abstract: This book puts forward a different approach to language change, the punctuated equilibrium model. This is based on the premise that during most of the 100,000 or more years that humans have had language, states of equilibrium have existed during which linguistic features diffused across the languages in a given area so that they gradually converged on a common prototype. From time to time, the state of equilibrium would be punctuated, with expansion and split of peoples and of languages, most recently, as a result of European colonisation and the globalisation of communication which are likely to result in the extinction, within the next hundred years, of 90% of the languages currently spoken. Professor Dixon suggests that every linguist should assume a responsibility for documenting some of these languages before they disappear.

An Introduction to Japanese Society

Abstract: An Introduction to Japanese Society provides a highly readable introduction to Japanese society by internationally renowned scholar Yoshio Sugimoto. Taking a sociological approach, the text examines the multifaceted nature of contemporary Japanese society with chapters covering class, geographical and generational variation, work, education, gender, ethnicity, religion, popular culture, and the establishment. This edition begins with a new historical introduction placing the sociological analysis of contemporary Japan in context, and includes a new chapter on religion and belief systems. Comprehensively revised to include current research and statistics, the text covers changes to the labor market, evolving conceptions of family and gender, demographic shifts in an aging society, and the emergence of new social movements. Each chapter now contains illustrative case examples, research questions, recommended further readings and useful online resources. Written in a lively and engaging style, An Introduction to Japanese Society remains essential reading for all students of Japanese society.

Relations between perceptions of the teaching environment and approaches to teaching

Abstract: Background. Previous research has established substantial relations between students' approaches to study in higher education and their perceptions of the learning environment. More recently, there has been a growing body of research into teachers' approaches to teaching and conceptions of teaching. There has, however, been little research into their perceptions of the teaching context. Aims. This study aimed to develop an inventory of university teachers' perceptions of their teaching environment (PTE) and how those perceptions related to their approaches to teaching. Samples. The interview sample comprised 13 teachers of first year university physics and chemistry courses in two Australian universities, and the survey sample comprised 46 teachers from several Australian universities. Methods. In the qualitative study teachers were interviewed about the things they thought affected their teaching. The interviews were content analysed, and an inventory was produced. In the quantitative study, the results of the administration of the Approaches to Teaching Inventory and the PTE were analysed by correlational, factor and cluster analyses. Results. This exploratory study found systematic relations between the perceptions and approaches. The relations observed suggest that the adoption of a conceptual change and student focused approach to teaching is associated with perceptions that the teacher has control over what is taught and how it is taught, as well as perceptions that the department values teaching and that class size is not too large. Conclusions. The paper concludes by arguing that if we are to improve the quality of teaching and learning in higher education we will need to take account of the perceptions teachers have of their teaching context.

Preserving the Information Content of Species: Genetic Diversity, Phylogeny, and Conservation Worth

Abstract: ▪ Abstract A variety of phylogenetic measures have been proposed to quantify distinctiveness, often held to mark species of high conservation worth. However, distinctiveness of species and their numbers have different implications for conservation policy, depending on whether moral, esthetic, or utilitarian reasons are accepted as justifying conservation. The utilitarian position values species according to increasing numbers, and as they are more, as opposed to less, distinctive. The view is taken that conservation should seek to maximize the preserved information of the planet's biota, best expressed in terms of genetic information held in genes and not in portions of the genome of uncertain or no function. Gene number is thus an important component of assessing conservation value. Phylogenetic measures are better indicators of conservation worth than species richness, and measures using branch-lengths are better than procedures relying solely on topology. Distance measures estimating the differences be...

The Geographic Distribution of Human Y Chromosome Variation

Abstract: We examined variation on the nonrecombining portion of the human Y chromosome to investigate human evolution during the last 200,000 years. The Y-specific polymorphic sites included the Y Alu insertional polymorphism or "YAP" element (DYS287), the poly(A) tail associated with the YAP element, three point mutations in close association with the YAP insertion site, an A-G polymorphic transition (DYS271), and a tetranucleotide microsatellite (DYS19). Global variation at the five bi-allelic sites (DYS271, DYS287, and the three point mutations) gave rise to five "YAP haplotypes" in 60 populations from Africa, Europe, Asia, Australasia, and the New World (n = 1500). Combining the multi-allelic variation at the microsatellite loci (poly(A) tail and DYS19) with the YAP haplotypes resulted in a total of 27 "combination haplotypes". All five of the YAP haplotypes and 21 of the 27 combination haplotypes were found in African populations, which had greater haplotype diversity than did populations from other geographical locations. Only subsets of the five YAP haplotypes were found outside of Africa. Patterns of observed variation were compatible with a variety of hypotheses, including multiple human migrations and range expansions.

Arterial compliance increases after moderate-intensity cycling

Abstract: Exercise training elevates arterial compliance at rest, but the effects of acute exercise in this regard are unknown. This study investigated the effects of a single, 30-min bout of cycling exercis...

Myelin oligodendrocyte glycoprotein: a novel candidate autoantigen in multiple sclerosis

Abstract: Myelin oligodendrocyte glycoprotein (MOG) is a member of the immunoglobulin superfamily expressed exclusively in central nervous system (CNS) myelin. While the function of MOG is unknown, a number of studies have shown that immune responses to MOG contribute to the autoimmune-mediated demyelination seen in animals immunized with whole CNS tissue. This paper summarizes our recent studies, which unequivocally demonstrate that MOG by itself is able to generate both an encephalitogenic T cell response and an autoantibody response in Lewis rats and in several strains of mice. In Lewis rats the injection of both native MOG and MOG35–55 peptide produces a paralytic relapsing-remitting neurological disease with extensive plaque-like demyelination. The antibody response to MOG35–55 was highly restricted, as no reactivity to either other MOG peptides or myelin proteins could be detected. Fine epitope mapping showed that antibody from serum and cerebrospinal fluid of injected rats reacted strongly to MOG37–46, which is contiguous to the dominant T cell epitope contained within MOG44–55. NOD/Lt and C57BL/6 mice were also susceptible to severe neurological disease following injection with recombinant MOG or MOG35–55 peptide, indicating that this specific CNS autoantigen, or some of its determinants, can induce a pathogenic response across animal species. Severe paralysis and extensive demyelination were seen in both strains, but NOD/Lt mice experienced a chronic relapsing disease whereas C57BL/6 mice had a chronic non-remitting disease. Moreover, transfer of MOG35–55 T cells into naive NOD/Lt mice also produced severe neurological impairment as well as histological lesions. These results emphasize that a synergism between a T cell-response and anti-MOG antibodies may be important for the development of severe demyelinating disease. This, together with our demonstration that there is a predominant T cell response to MOG in patients with multiple sclerosis, clearly indicates that MOG is probably an important target autoantigen in this disease.

There is no highly conserved embryonic stage in the vertebrates : implications for current theories of evolution and development

Abstract: &p.1: Embryos of different species of vertebrate share a common organisation and often look similar. Adult differences among species become more apparent through divergence at later stages. Some authors have suggested that members of most or all vertebrate clades pass through a virtually identical, conserved stage. This idea was promoted by Haeckel, and has recently been revived in the context of claims regarding the universality of developmental mechanisms. Thus embryonic resemblance at the tailbud stage has been linked with a conserved pattern of developmental gene expression ‐ the zootype. Haeckel’s drawings of the external morphology of various vertebrates remain the most comprehensive comparative data purporting to show a conserved stage. However, their accuracy has been questioned and only a narrow range of species was illustrated. In view of the current widespread interest in evolutionary developmental biology, and especially in the conservation of developmental mechanisms, re-examination of the extent of variation in vertebrate embryos is long overdue. We present here the first review of the external morphology of tailbud embryos, illustrated with original specimens from a wide range of vertebrate groups. We find that embryos at the tailbud stage ‐ thought to correspond to a conserved stage ‐ show variations in form due to allometry, heterochrony, and differences in body plan and somite number. These variations foreshadow important differences in adult body form. Contrary to recent claims that all vertebrate embryos pass through a stage when they are the same size, we find a greater than 10-fold variation in greatest length at the tailbud stage. Our survey seriously undermines the credibility of Haeckel’s drawings, which depict not a conserved stage for vertebrates, but a stylised amniote embryo. In fact, the taxonomic level of greatest resemblance among vertebrate embryos is below the subphylum. The wide variation in morphology among vertebrate embryos is difficult to reconcile with the idea of a phyogenetically-conserved tailbud stage, and suggests that at least some developmental mechanisms are not highly constrained by the zootype. Our study also highlights the dangers of drawing general conclusions about vertebrate development from studies of gene expression in a small number of laboratory species. &kwd:words Morphogenesis · Developmental biology · Comparative anatomy · Comparative study · Embryology&bdy:

Adverse psychological impact of operative obstetric interventions: a prospective longitudinal study.

Abstract: Objective: This paper reports the findings of a prospective longitudinal study of 272 nulliparous pregnant women, which investigated as one of its objectives the psychological sequelae of obstetric procedures.Method: Participants completed structured interviews and standardised, published psychometric questionnaires, including the Rosenberg Self-Esteem Scale and the Profile of Mood States late in pregnancy and again early in the postpartum period. Results: Little evidence was found to support the notion that the total number of obstetric interventions was linked to a deterioration in postpartum mood. Significant adverse psychological effects were associated with the mode of delivery. Those women who had spontaneous vaginal deliveries were most likely to experience a marked improvement in mood and an elevation in self-esteem across the late pregnancy to early postpartum interval. In contrast, women who had Caesarean deliveries were significantly more likely to experience a deterioration in mood and a dimin...

Arterial Compliance in Obese Subjects Is Improved With Dietary Plant n-3 Fatty Acid From Flaxseed Oil Despite Increased LDL Oxidizability

Abstract: The compliance or elasticity of the arterial system, an important index of circulatory function, diminishes with increasing cardiovascular risk. Conversely, systemic arterial compliance improves through eating of fish and fish oil. We therefore tested the value of high intake of α-linolenic acid, the plant precursor of fish fatty acids. Fifteen obese people with markers for insulin resistance ate in turn four diets of 4 weeks each: saturated/high fat (SHF), α-linolenic acid/low fat (ALF), oleic/low fat (OLF), and SHF. Daily intake of α-linolenic acid was 20 g from margarine products based on flax oil. Systemic arterial compliance was calculated from aortic flow velocity and aortic root driving pressure. Plasma lipids, glucose tolerance, and in vitro LDL oxidizability were also measured. Systemic arterial compliance during the first and last SHF periods was 0.42±0.12 (mean±SD) and 0.56±0.21 units based on milliliters per millimeter of mercury. It rose significantly to 0.78±0.28 ( P <.0001) with ALF; systemic arterial compliance with OLF was 0.62±0.19, lower than with ALF ( P <.05). Mean arterial pressures and results of oral glucose tolerance tests were similar during ALF, OLF, and second SHF; total cholesterol levels were also not significantly different. However, insulin sensitivity and HDL cholesterol diminished and LDL oxidizability increased with ALF. The marked rise in arterial compliance at least with α-linolenic acid reflected rapid functional improvement in the systemic arterial circulation despite a rise in LDL oxidizability. Dietary n-3 fatty acids in flax oil thus confer a novel approach to improving arterial function.

Vulnerability on the streets: female sex workers and HIV risk.

Abstract: In-depth interviews were conducted with 24 purposively selected female sex workers who were perceived to be vulnerable to risks associated with their lifestyle and occupation. Brothel workers were found to be considerably less exposed to risk than the women working on the streets. Client resistance was the major obstacle to women maintaining safe sex practices. Physical threats and coercion from clients, the absence of legal protection for street workers, the workers' extreme social isolation and lack of community support added to the difficulties experienced by women in their attempts to insist on condoms for all sex services. Youth, homelessness and heavy drug use had contributed to women being at times even more vulnerable because they had less capacity to manage situations of potential violence or STD risk. Whether through sex work or in their private relationships, HIV remains a risk for some of these women. This study highlights the dangers associated with illegal sex work. While decriminalization of prostitution would reduce some of the dangers to which women were exposed and increase women's capacity to insist on safe sex practices, it is also important for community education programmes to address men's failure to accept responsibility for condom use when seeking the services of sex workers.

Luminescence dating of rock art and past environments using mud-wasp nests in northern Australia

Abstract: Mud-nesting wasps are found in all of the main biogeographical regions of the world1,2,3, and construct nests that become petrified after abandonment. Nests built by mud-dauber and potter wasps in rock shelters in northern Australia1,4 often overlie, and occasionally underlie, prehistoric rock paintings. Mud nests contain pollen, spores and phytoliths from which information about local palaeovegetation can be gleaned. Here we report a new application of optical dating5,6,7, using optically stimulated luminescence (OSL), and accelerator mass spectrometry (AMS) 14C dating of pollen8 to determine the ages of mud-wasp nests associated with rock paintings in the Kimberley region of Western Australia9,10. Optical dating of quartz sand (including the analysis of individual grains) embedded in the mud of fossilized nests shows that some anthropomorphic paintings are more than 17,000 years old. Reconstructions of past local environments are also possible from the range of pollen and phytolith types identified. This approach should have widespread application to studies of rock-art dating and late Quaternary environmental change on continents where mud-wasps once lived and other sources of palaeoecological information are absent.

Towards an Understanding of Individual Acts of Teaching and Learning

Abstract: This article uses a phenomenographic perspective to interpret and integrate the results of relational research, including phenomenography in particular, in analysing the experiences of teaching and learning in higher education. In this analysis the experience is conceived of as temporal and not extended over time. We describe conditions associated with two qualitatively different approaches to teaching which, as suggested by other research results, are associated with differences in the quality of student learning. Such an analysis can help explain the variation in the experience of the same lecturer in different teaching contexts or of different lecturers in the same teaching context.

Gender Equity and the Boys Debate: what sort of challenge is it?

Abstract: Recently public and policy discussions about gender equity have become strongly concerned with boys. This article discusses some aspects of the form, the context and the implications of these developments in Australia (and notes some points of similarity and difference with developments in the UK). It focuses on three main areas: the ways examination and other 'indicators' have been used in public policy constructions of gender inequality; secondly, the issue of what types of reforms constitute gender equity as a project; and thirdly, the issue of research agendas and the entry of masculinity to gender research.

Physiotherapists' use of evidence based practice: a cross-national study

Abstract: This study investigated clinical physiotherapists' reasons for their use of treatment techniques, with a particular focus on their utilisation of journal review and research literature. A questionnaire was completed by 180 physiotherapists in England and 141 physiotherapists in Australia. Despite the greater prevalence of pre-registration degree respondents in Australia, there were no differences between the two national groups in their reasons given for choice of treatment techniques. The basis of over 90% of each groups choice of techniques reflected what was taught during their initial training. Experience of treatment effects on prior patients, and information gained in practice-related courses, were also primary reasons. Research literature ranked least in importance as a basis for choosing techniques, and review articles fared little better. The results indicated that these physiotherapists relied mainly on information gained from formal pre- and post-registration courses. By implication, the most obvious means of influencing physiotherapists' attitudes to research utilisation lies with those responsible for physiotherapy education.

Substratum adhesion and gliding in a diatom are mediated by extracellular proteoglycans

Abstract: Diatoms are unicellular microalgae encased in a siliceous cell wall, or frustule. Pennate diatoms, which possess bilateral symmetry, attach to the substratum at a slit in the frustule called the raphe. These diatoms not only adhere, but glide across surfaces whilst maintaining their attachment, secreting a sticky mucilage that forms a trail behind the gliding cells. We have raised monoclonal antibodies to the major cell surface proteoglycans of the marine raphid diatom Stauroneis decipiens Hustedt. The antibody StF.H4 binds to the cell surface, in the raphe and to adhesive trails and inhibits the ability of living diatoms to adhere to the substratum and to glide. Moreover, StF.H4 binds to a periodate-insensitive epitope on four frustule-associated proteoglycans (relative molecular masses 87, 112, and >200 kDa). Another monoclonal antibody, StF.D5, binds to a carbohydrate epitope on the same set of proteoglycans, although the antibody binds only to the outer surface of the frustule and does not inhibit cell motility and adhesion.

Geochronology of the northern Idaho batholith and the Bitterroot metamorphic core complex: Magmatism preceding and contemporaneous with extension

Abstract: Granitic plutonism and extension are broadly contemporaneous in many metamorphic core complexes. However, the relationship between magmatism and extension is rarely unambiguous. The northern Idaho batholith (Idaho-Bitterroot batholith), Montana and Idaho, composes the footwall for most of the Bitterroot metamorphic core complex and thus is an ideal area for assessing the relationships between magmatism and extension. We analyzed zircon from six samples of granitic rock from the Idaho-Bitterroot batholith using the SHRIMP (II) ion microprobe. Three samples of mylonitic granite from the Bear Creek pluton, Lost Horse Canyon, give a weighted mean 206 Pb/ 238 U age of 54.3 ± 0.7 Ma. A protomylonitic granite from the central part of the Bitterroot core complex (also Bear Creek pluton) gives a similar 206 Pb/ 238 U age of 54.6 ± 0.8 Ma. Mylonitic megacrystic granite from Sweathouse Canyon yields an age of 63.6 ± 0.6 Ma. A granite sample from the Lochsa Canyon, in the central Idaho-Bitterroot batholith, gives an age of 56.7 ± 1.0 Ma. Inherited zircon from the granitoids ranges in age from 800 to 1820 Ma, but the majority of grains have formation ages of 1750–1800 Ma. This suggests that Paleoproterozoic crust dominates the source region of the Idaho-Bitterroot batholith. Hornblende 40 Ar- 39 Ar age spectra for mafic dikes intruded during late-stage crystallization of main-phase granite in the central Idaho-Bitterroot batholith suggest crystallization of the main-phase plutons in this area at ca. 57 Ma. New and previously published 40 Ar- 39 Ar and K-Ar apparent ages of biotite and muscovite from the Lochsa River area and the western and central Bitterroot core complex are 50 to 47 Ma. Younger mica ages (46–43 Ma) are restricted to the vicinity of the Bitterroot mylonite zone. These results indicate that the cessation of main-phase magmatism within the Bitterroot metamorphic core complex migrated east with time, and that most of the plutons in the core complex were intruded during the Paleocene and early Eocene. When the regional tectonic setting changed from compression to extension at ca. 50 Ma, the late stages of mid-crustal, peraluminous plutonism appear to have been localized within the Bitterroot core complex. The presence of the youngest mid-crustal plutons in this area may have focused extensional deformation leading to the thick mylonite zone, as a consequence of rheological contrasts with cooler areas to the east and west. A progression of K-Ar and 40 Ar- 39 Ar cooling ages from west to east within the core complex part of the batholith is consistent with top-to-the-east shear indicators in the mylonite zone. Thermochronology indicates that the western part of the Bitterroot metamorphic core complex was below ≈350°C at the same time as the last stage of granite emplacement and metamorphism in the east. Therefore, the transition from mylonitization to brittle deformation to inactivity of the shear zone was progressive from west to east across the core complex from ca. 50 to 44 Ma. These features offer an explanation for the previously enigmatic occurrence of amphibolite facies ductile deformation in the eastern part of the core complex coincident with emplacement of epizonal, alkali-feldspar granite plutons along the western side of the complex.