Search for dissertations about: "embryo survival"
Showing result 1 - 5 of 33 swedish dissertations containing the words embryo survival.
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1. Egg size evolution and paternal care in pipefishes
Abstract : In this thesis I explore how sexual selection, sexual conflicts, coevolution with parental care and an environmental selective agent (hypoxia) affect the evolution of different egg characteristics and embryo survival and size in pipefishes (Syngnathidae). In the broad-nosed pipefish, Syngnathus typhle Linnaeus, both sexes prefer to mate with large partners; large females produce more and larger eggs and large males can care for more young, and, as shown in this thesis, invest more per embryo and provide better oxygenation during brooding. READ MORE
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2. Paternal care and brood reduction in a pipefish
Abstract : From an evolutionary and adaptive perspective, the occurrence and extent of parental care in animals (investment in offspring beyond the genetic contribution) is expected to depend on an optimal (fitness-maximizing) balance of its costs and benefits. Males of the sex-role reversed broad-nosed pipefish, Syngnathus typhle, which care for eggs and embryos and may perform brood reduction, are particularly interesting in this respect. READ MORE
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3. GM-CSF. A regulator of pre-implantation embryo development
Abstract : GM-CSF is a multifunctional cytokine expressed in abundance in the female reproductive tract during early pregnancy. We have investigated the regulatory influence of GM-CSF in development of pre-implantation mouse and human embryos. READ MORE
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4. Improved environmental monitoring and assessment : Establishing links between effects of chemical pollution at different levels of biological organization in a Baltic Sea bioindicator species (Monoporeia affinis)
Abstract : A large number of chemicals enters the marine environment via atmospheric deposition, run-off, rivers and streams, industrial effluents and municipal wastewater. To understand how chemicals affect environmental health, monitoring and assessment approaches need to combine physical, chemical and biological effect parameters from different levels of biological organization. READ MORE
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5. Cannabinoids as modulators of cancer cell viability, neuronal differentiation, and embryonal development
Abstract : Cannabinoids (CBs) are compounds that activate the CB1 and CB2 receptors. CB receptors mediate many different physiological functions, and cannabinoids have been reported to decrease tumor cell viability, proliferation, migration, as well as to modulate metastasis. READ MORE