159 resultados para fertilisation success

em Deakin Research Online - Australia


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Hormosira banksii is distributed throughout southern Australasia, but dispersal of propagules is thought to be limited. In the present study, the hypothesis that outbreeding depression occurs in H. banksii was tested by assessing fertilisation success and early development of embryos in crosses between populations at local to regional spatial scales. Hierarchical experiments were conducted at three spatial scales with nesting present within each scale: small scale (within a rocky shore population), intermediate scale (regions separated by 70 km) and large scale (450-km separation between two states: Victoria and Tasmania). In each experiment, eggs and sperm were crossed within and between each population located in the spatial scale of interest. There were no consistent patterns of variable fertilisation success and subsequent development within a population or at different spatial scales. It was concluded that outbreeding depression is not detected in analyses of fertilisation success or early development processes in H. banksii. The results suggest one of the following to be likely: (1) H. banksii is capable of longer distance dispersal than previously considered, thus maintaining gene flow between distant populations, (2) gene flow is restricted by limited dispersal, but populations have not been isolated for a sufficient length of time to cause genetic divergence or (3) outbreeding depression is manifested as effects on later life-history stages.

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The spatial scales of population genetic structure in three species of Antarctic echinoderm, Sterechinus neumayeri, Abatus nimrodi and Abatus ingens was quantified using mitochondrial sequences and a novel set of microsatellite markers. Reduced fertilisation success in S. neumayeri resulting from increasing temperature and decreasing salinity was also identified.

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Small to medium-sized enterprises (SMEs) contribute significantly to national economies and employment levels and represent a viable source for inventions and innovations. The emergence of electronic commerce in the early 90's could provide different opportunities to the small business sector to overcome its inadequacies. However, in view of the electronic commerce/business (EC) literature in organizations in general and in SMEs specifically, EC research is scarce. Available research portrays a gloomy picture about EC uptake and use by SMEs. Therefore, this chapter attempts, by reviewing recent EC research, to depict an agenda for EC success in SMEs made up of ten influencing factors. Thus, an attempt is made to develop deeper understanding about the factors influencing EC success in SMEs. By following the suggested guidelines in this chapter, SMEs would be in a better position to assess the Viability o/the new EC perspective 10 their organizations. The same factors are highly important to researchers, SMEs, professionals (including educational institutions) and policymakers in driving SMEs and EC forward.

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Hallmark sporting events often are commercially driven entertainment entities which represent an economically important part of the overall sport industry. Because of the high popularity of international sporting contests, hallmark sporting events attract significant commercial, media, and consumer attention. Cities around the world are beginning to understand the potential of using these events to draw attention to the host city, which is why the market for hallmark sporting events is becoming increasingly competitive. In order to award the hosting of the event to the most suitable organizer, event owners often require potential hosts to bid. The most important elements in this process have been largely based on logical assumptions rather than empirical data. This study focused on the bid process in order to ascertain the important elements essential in achieving a successful bid.

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Experience has shown that development NGOs typically do not succeed in transforming themselves into financially sustainable providers of financial intermediation services. The reasons for this failure are complex (see Dichter 1999). Nonetheless, the role that NGOs play as microfinance providers is important and the contribution they could make to poverty reduction would be greatly enhanced if they adhered to some simple but essential parameters of success.

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The paper examines the contributing factors to new product success within the Australian grocery market. A review of the literature on new product success factors and reasons for failure is presented. The research identifies reasons for failure of new products as well as reasons for success. The main reasons for new product failure are incorrect pricing, poor marketing, wrong product launch timing, poor distribution and lack of marketing funds. For new product success it is critical to have strong leadership, competent staff and an on-going new product development process.

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Objective: To examine perceptions of success in weight control and future weight-control intentions in a community sample. Design: Cross-sectional postal survey. Subjects: There were 1500 adults randomly selected from the Electoral Roll of Victoria (47% response). Setting: Community. Main outcome measures: Retrospective weight change over previous 12 months; perceived weight-control success; future weight-control intentions. Statistical analyses: Pearson's χ² tests were used to compare perceived weight-control success by sex, and by age, education level, initial BMI, amount of weight change and weight-loss behaviour within sex. ANOVA was used to compare mean weight change associated with perceived weight control success within sex, and within age, education, body mass index and weight-loss behaviour by sex. The distribution (frequency) of weight-control intentions are reported within perceived weight-control success and amount of weight change. Results: One in two (53%) reported maintaining their weight within 1kg in the preceding 12 months, 26% of men and 21% of women reported weight gain and 20% of men and 26% of women reported weight loss. Almost one-third (30%) of those who maintained their weight considered themselves unsuccessful. A majority of those who lost weight considered themselves successful at controlling their weight. However, more than 45% of men who gained weight also considered themselves successful. Those who considered themselves unsuccessful experienced less weight loss (1.1 ± 3.9kg) than those who considered themselves quite successful (-1.4 ± 4.5 kg, P < 0.001) or very successful (-1.3 ± 7.8 kg, P < 0.001). Conclusion: Public views of what constitutes successful weight control may need to be reoriented to be consistent with public health goals.

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The world of telecommunications, especially mobile communications, continues to evolve with innovative technologies and high-speed data services. In many economies, mobile phones have overtaken fixed lines. In this dynamic context, we have envisaged to study mobile communication diffusion in Germany and India, from a historical comparative perspective. The basic standard for comparison has been Global Systems for Mobile Communications (GSM) and its data services, which was adopted by both economies. Subsequently, critical success factors in each economy is drawn and compared with the other, to elicit future directions.

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The implementation of various management systems and standards has become an important activity for organisations irrespective of their size, sector or nature of the business. Even with a history of implementing change across the organisation, managers continue to experience resistance and challenges when implementing and maintaining the systems/standards, whether they be in quality, occupational health and safety, environmental or any other area. Based on a major research project recently completed, this paper presents the critical success factors for successful implementation of an environmental management system. The project involved three phases of fieldwork: preliminary interviews, a questionnaire survey and in-depth interviews. A brief summary of the findings from each of these phases of research is presented. Based on the findings, the paper discusses the critical success factors for the successful implementation and maintenance of EMS.

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Fertilisation kinetics theory suggests that, when sperm are limiting, the larger eggs of broadcast-spawning marine organisms ought to be fertilised more frequently than smaller eggs, because they provide a bigger target for searching sperm. Whilst this effect has been demonstrated within species, it is not known if this pattern holds among species. We tested whether a large difference in egg size between congeneric seastars with contrasting planktotrophic and lecithotrophic modes of development results in differences in the likelihood of eggs being fertilised in sperm-limiting situations. Measurement of egg sizes and sperm swimming speeds led to the prediction that the sperm–egg collision rate constant for Patiriella calcar (420-µm-diameter egg) should be nine times greater than for P. regularis (140-µm-diameter egg). Although the eggs of P. calcar should be fertilised at greater rates in low sperm concentrations, they were not. When gametes were allowed to mix for 10 s, the hypothesis that P. calcar eggs required less sperm than P. regularis to ensure 50% of eggs were fertilised was rejected. When gametes were mixed for 5 min, P. regularis eggs were more frequently fertilised, but the difference was not statistically significant. We conclude there must be a difference between these species in the likelihood that when a sperm finds a conspecific egg it can successfully fertilise. This apparent uncoupling of egg size and likelihood of fertilisation suggests that fertilisation is not a major constraint on the evolution of egg size in these seastars.

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Small to medium-sized enterprises (SMEs) contribute significantly to the national economies and to the employment levels of different countries and represent a viable source for inventions and innovations. The recent emergence of electronic commerce in the early nineties could provide different opportunities to the small business sector to overcome its inadequacies. However, in view of the electronic commerce/business (EC) literature in organisations in general and in SMEs specifically, it was observed that EC research is scarce. Therefore, this research attempts, by reviewing relevant EC literature, to develop deeper understanding about the factors influencing EC success in SMEs. The researcher found the following issues significantly influence EC success in SMEs: e-Value, e-Cost, e-Transformation, e-Product, e-Nvolvement, e-Nnovativeness, e-Competition, external e-Support, and e-Pressure. These factors are of importance to researchers, SMEs, professionals including educational institutions and policymakers in driving SMEs and EC forward.

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Using a theoretical framework extracted from thetechnological innovation theories, this research attempts to explain factors influencing the adoption and diffusion of telemedicine utilising the video conferencing technology (TMVC) for dermatology within health Waikato (HW) in New Zealand. Findings indicate weak presence of critical assessment into technological innovation factors prior to TMVC adoption. Factors such as complexity, compatibility, and trialability were not assessed extensively by HW and could have hindered its adoption. TMVC was mainly assessed according to its relative advantage and cost effectiveness. This is essential but should consider other important factors explained in this research. The successful diffusion of TMVC in the case study relied on its economical benefit and on its effectiveness as a diagnostic tool. This research highlights the importance of the product champion factor on the successful adoption and diffusion of TMVC.