Technogyny : the transformation of reproduction

Explores the major social and political consequences of new reproductive and genetic technologies. Increasingly the experience and process of reproduction is dominated by technology and medicine. Suggests an international institution such as the UN is likely to be the most effective in addressing the concerns associated with the technologies' adverse effects. Such intervention is unlikely without active and sophisticated lobbying from women around the world.

Environmental education in Thailand : reproduction and reformation

This study was conducted to improve the pedagogy of a particular teacher education course and its teaching and learning activities. It was based on the principles of action research. Results indicate that through group process workshops and the action research projects the research and participants acquired skills in problem-solving and collaborative work.

Reproduction and social control : women in Australia 1900-1999

Examines the conditions of Australian women in their reproductive lives, in a social and scientific context throughout the twentieth century. Aims to identify those areas which have influenced change (if it has occurred), the types of change and the impact those changes have had on the lives of women, given the premise that the social life of women, in all its forms, is predicated by their reproductive function.

Reproduction, resistance and transformation at Marantha High School

The focus of this thesis is the attempt by the Seventh-day Adventist Church to reproduce SDA culture in students attending one of its schools, Maranatha High School. As a 'critical ethnography', it adopts a theoretical perspective from critical social theory to examine problems associated with this attempt. These problems are reflected in data gathered by a range of ethnographic techniques. The study first portrays the socio-political dynamics underlying the historical creation of Adventist culture generally, its embodiment in institutional forms, and the development of a substantial educational structure intended to transmit that culture to succeeding generations.

The study then focuses on current SDA educational philosophy, and the assumptions underlying the principles of selection, organisation, transmission and evaluation of knowledge considered to be valid. It then examines how Maranatha High School itself seeks to implement those principles. In this context, the study also reflects on the political implications of the modes of management and institutional control adopted at various levels of the organisation and in the school.

As a dialectical study, the thesis views the school as a social setting in which knowledgeable humans engage in communicative interaction. Rather than promoting smooth reproduction, the school is portrayed as a site of struggle, negotiation and potential transformation as participants resist forces that they perceive to be constraining and oppressing them. Consequently the thesis examines the perceptions of the various groups of participants, and the nature and impact of their interaction. In as much as teachers are official 'managers' of SDA culture and knowledge, this examination focuses especially on their personal definitions of the situation, the dilemmas that confront them from internal and external sources, the development of their own cultural forms in response, and the implications this action has for cultural reproduction and continuity.

Molecular studies of reproduction in Haliotis species

Haliotids are expensive seafood molluscs known as abalone. The research involved cloning and expression of genes involved with their reproduction, including some involved with female egg-laying. Genes characterised in this study were put into bacteria to make reproductive molecules which were then injected into abalone to induce spawning. The results provide important information towards abalone cultivation.

Comparison of life-history characteristics of island and mainland populations of the swamp antechinus

The reproductive ecology of the swamp antechinus Antechinus minimus, a small dasyurid (Dasyuridae) marsupial with obligate male semelparity, was investigated in populations inhabiting the mainland coast and on a nearby offshore island in south-eastern Australia. The size and sex ratios of litters, individual body mass and size, timing of births and female longevity were determined from live-trapped animals. The island population had significantly smaller litter sizes and greater adult body mass in comparison with the mainland population. This is consistent with features of the ‘island syndrome’, which predicts directional selection for these traits in high-density populations with reduced extrinsic mortality. However, inter-annual variability in litter sizes in the island population suggests that litter size is more responsive to fluctuating local conditions, such as population density, which is likely to affect food availability, rather than directional genetic changes. In contrast with other antechinus species, biased sex ratios were not evident. In addition, large variations of the timing of births were estimated at both sites and these appear to be related to seasonal conditions such as autumn rainfall and female body mass before mating.

Molting and reproduction in portunus pelagicus

This investigation describes ovarian maturation stages in the female reproductive system, evidence for histones in sperm nuclei and novel morphological changes that occur during spermiogenesis in the male blue swimming crab, portunus pelagicus. It also identifies dual functionality of the molt inhibiting hromone on molting and vitellogenesis through RNA inteference.

Stimulatory effects of egg-laying hormone and gonadotropin-releasing hormone on reproduction of the tropical abalone, Haliotis asinina linnaeus

Egg-laying hormone (ELH) is a neuropeptide hormone that stimulates ovulation of gastropods, including Aplysia californica and Lymnaea stagnalis. Other neuropeptides, gonadotropin releasing hormones (GnRHs), also play important roles in controlling reproduction in both vertebrates and invertebrates. In the current study, the effects of abalone ELH (aELH) and several GnRHs on somatic growth, sex differentiation, gonad maturation, and spawning of Haliotis asinina were investigated in 3 experiments. In experiment 1, groups of 4-mo-old juveniles (11.8 ±  0.03 mm shell length (SL) and 0.33 ± 0.04 g body weight (BW)) were injected with aELH and GnRHs, including buserelin (mammalian GnRH analogue), octopus GnRH (octGnRH), and tunicate GnRH-I (tGnRH-I), at doses of 20 ng/g BW and 200 ng/g BW. The aELH induced early sex differentiation with a bias toward females, but with normal somatic growth, whereas the different isoforms of GnRH had no effect on sexual differentiation or somatic growth. In experiment 2, groups of 1-y-old-abalone (SL, 4.04 ± 0.02 cm; BW, 20.15 ± 0.25 g) were injected with aELH and the 3 isoforms of GnRH including buserelin, octGnRH, and lamprey GnRH (1GnRH-I) at doses of 500 ng/g BW and 1,000 ng/g BW, and all produced stimulatory effects. For each peptide treatment, the gonads reached full maturation within 5- 6 wk and spawning occurred, whereas control groups took 8 wk to reach maturity. In experiment 3, injections of ripe abalone with aELH stimulated spawning of both sexes in a dose-dependent manner. Buserelin had a lesser effect on inducing spawning, and octGnRH had no apparent effect. The gametes released from induced spawnings by aELH and GnRH showed normal fertilization and development of larvae. Altogether, these findings provide further knowledge on manipulating abalone reproduction, which is important in improving abalone aquaculture.

Effects of snow cover on the timing and success of reproduction in high-Arctic pink-footed geese Anser brachyrhynchus

During four breeding seasons, 2003–2006, we studied the relationship between snow cover and nesting performance in pink-footed geese (Anser brachyrhynchus) in a key breeding site on Svalbard. Snow cover in late May, i.e., at the time of egg laying of geese, was derived from MODIS satellite images. Snow cover had a profound cascading effect on reproductive output via the number of nesting pairs and timing of nesting, which affected nest success, while there was only a tendency for a negative effect on clutch size. Hence, we estimated a five-fold difference in the number of young produced (to post-hatching) between years with little snow and years with high snow cover. The results from the study area correlated with whole-population productivity estimates recorded in autumn. Thus, snow cover derived from MODIS satellite images appears to provide a useful indicator of the breeding conditions in the Arctic.

The developmental stress hypothesis: A special case of the evolution of condition-dependent sexual traits

The idea that sexually selected traits might be condition dependent is far from novel (Zahavi 1975); however, the developmental stress hypothesis was proposed as a special case because of a highly plausible mechanism: the development of the neural circuits controlling song output coincides with a period of time during which developing birds are likely to be susceptible to stress. The elegant aspect of the hypothesis is that the mechanism is defined and effects can be readily tested (Nowicki et al. 1998; Buchanan et al. 2003). Compared with more general hypotheses about the evolution of condition-dependent sexual traits (Buchanan 2000), the second particularly interesting aspect of the developmental stress hypothesis is that, in some species, individuals may suffer historical markers of stress. This is because in species with a fixed period for neural growth and song learning, there is no possibility for compensation in later life for stress experienced during early development. Females using such a marker of stress may benefit by obtaining a partner whose other cognitive functions have not been impaired by stress.

Reproduction

"Reproduction" is a mixed reality installation that investigates the flow of data between the material world and synthetic worlds, in particular realtime 3D environments, through the creation of a persistent realtime 3D environment populated with agent entities that evolve over the duration of the exhibition in response to the actions of the human visitors to the gallery.

Reproduction

"Reproduction" is a mixed reality installation that investigates the flow of data between the material world and synthetic worlds, in particular realtime 3D environments, through the creation of a realtime 3D environment populated with agent entities that evolve over the duration of the exhibition in response to the navigation through the environment of the human visitors.