Australian journal of biotechnology最新文献

This paper reviews the use of yeasts to produce heterologous proteins via the development of transformation systems. The ability to genetically engineer yeast cells has many advantages over prokaryotic systems. Yeasts are already well established in fermentation procedures, are able to secrete glycosylated and modified proteins to render the proteins biologically active, and yeasts do not secrete toxic chemicals. With the techniques available it is possible to explore yeasts as hosts for the expression and secretion of commercially-useful proteins.

The Genetic Manipulation Advisory Committee (GMAC) is the national body which reviews research and development work in Australia using genetic manipulation technologies. It supersedes and continues the work of the Recombinant DNA Monitoring Committee (RDMC). GMAC has recently drafted new guidelines for small scale laboratory work. The difference between these guidelines and the ones they have replaced is the broadening of the scope of work to be monitored, from recombinant DNA work to other genetic technologies which may also produce new combinations of inheritable genetic material. Experience from assessing proposals over the life of the RDMC and a previous Academy of Science committee enabled the GMAC Scientific Sub-committee to be more specific about the experiments it wanted to assess before they can begin, and those which could be safely exempted from the guidelines.

Cnidarians are generally considered to be the most primitive group of eumetazoans. They are therefore of considerable interest for comparative studies of metazoan development and evolution. The application of molecular techniques to cnidarians can provide important insights into developmental processes and phylogenetic relationships both within the phylum Cnidaria and among the eumetazoa. This paper reviews current knowledge of molecular and developmental biology of cinidarians with particular emphasis on tropical scleractinian corals and soft corals from the Great Barrier Reef region. Nucleotide sequencing of the histone gene cluster has unequivocally established that cnidarians are typical eumetazoans. Repeated sequence analysis has been applied to the staghorn corals, and implies a major divergence within this group, which corresponds with differences in sperm ultrastructure. Recent developmental studies of corals have indicated that some species have an unusual method of germ layer formation. Molecular events associated with this process, and with other important developmental stages, are currently under investigation. Other areas of current research interest, including targets for PCR-based investigations into cnidarian phylogeny, are highlighted.

Micro-organisms can potentially supplement or replace the use of chemical fertilizers and pesticides in many agricultural cropping systems. Their increased use may reduce the need for nitrogen and phosphorus fertilizers, particularly in legume and cereal crops, and provide a more ecologically sound method of controlling pests and phytopathogens. Recombinant DNA technology offers the potential to extend and improve these applications. However, genetically modified micro-organisms may occasionally themselves pose environmental risks. Model ecosystems such as intact soil-core microcosms may be useful for both testing efficacy and evaluating environmental risk prior to proceeding with field trials.

Fungi are organisms of enormous industrial importance, and are used for the production of compounds such as antibiotics, organic acids and immunosuppressants. Many studies have suggested that their industrial value may in some cases be increased by exploitation of technologies involving fungal protoplasts, where the cell wall has been removed, usually enzymically. This article critically examines what the advantages of using protoplasts are, the current methodology for the preparation, and how they behave subsequently.