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Full-Text Articles in Life Sciences

Tailed Forisomes Of Canavalia Gladiata: A New Model To Study Ca2+-Driven Protein Contractility, Winfried Peters, Michael Knoblauch, Stephen Warmann, Reinhard Schnetter, Amy Shen, William Pickard Jun 2007

Tailed Forisomes Of Canavalia Gladiata: A New Model To Study Ca2+-Driven Protein Contractility, Winfried Peters, Michael Knoblauch, Stephen Warmann, Reinhard Schnetter, Amy Shen, William Pickard

Winfried S. Peters

Background and Aims Forisomes are Ca2+-dependent contractile protein bodies that form reversible plugs in sieve tubes of faboid legumes. Previous work employed Vicia faba forisomes, a not entirely unproblematic experimental system. The aim of this study was to seek to establish a superior model to study these intriguing actuators.
Methods Existing isolation procedures were modified to study the exceptionally large, tailed forisomes of Canavalia gladiata by differential interference contrast microscopy in vitro. To analyse contraction/expansion kinetics quantitatively, a geometric model was devised which enabled the computation of time-courses of derived parameters such as forisome volume from simple parameters readily determined …


Response Surface Methodology For Studying The Effect Of Processing Conditions On Some Nutritional And Textural Properties Of Bambara Groundnuts (Voandzei Subterranea) During Canning, Emmanuel Ohene Afoakwa, Agnes Simpson Budu, Alan Bullock Merson May 2007

Response Surface Methodology For Studying The Effect Of Processing Conditions On Some Nutritional And Textural Properties Of Bambara Groundnuts (Voandzei Subterranea) During Canning, Emmanuel Ohene Afoakwa, Agnes Simpson Budu, Alan Bullock Merson

Professor Emmanuel Ohene Afoakwa

The response surface methodology and central composite rotatable design for K=3 was used to study the combined effect of blanching, soaking and sodium hexametaphosphate salt concentration on moisture, ash, leached solids, phytates, tannins and hardness of bambara groundnut during canning. Regression models were developed to predict the effects of the processing parameters on the studied indices. Significant interactions were observed between all the factors with high regression coefficients (64.4-82.6%). Blanching and soaking of the seeds prior to canning led to increases in moisture content and leached solids, while significant decreases were observed for phytates, tannins and hardness of the canned …


Reversible Birefringence Suggests A Role For Molecular Self-Assembly In Forisome Contractility, Winfried Peters, Reinhard Schnetter, Michael Knoblauch Apr 2007

Reversible Birefringence Suggests A Role For Molecular Self-Assembly In Forisome Contractility, Winfried Peters, Reinhard Schnetter, Michael Knoblauch

Winfried S. Peters

Forisomes are contractile protein bodies that control the effective diameter of the sieve elements of the faboid legumes by reversible, Ca2+-driven changes of shape. Forisomes consist of fibrils; we inferred from available electron-microscopical data (which necessarily provide images of fixed, non-functional forisomes) that a reversible assembly of ordered fibrillar arrays might be involved in the contractile mechanism. Here we examined functional forisomes isolated from Vicia faba L. by differential interference contrast microscopy and polarisation microscopy. We found them birefringent in the longitudinally expanded but not in the contracted state, showing ‘parallel extinction’ with the direction of vibration of the slow …


A Long And Winding Road: The Regulation Of Private Native Forestry In New South Wales, Australia, Jerome K. Vanclay, J Doland Nichols Dec 2006

A Long And Winding Road: The Regulation Of Private Native Forestry In New South Wales, Australia, Jerome K. Vanclay, J Doland Nichols

Professor Jerome K Vanclay

This special issue of Small-Scale Forestry is concerned with private native forestry (PNF) in New South Wales (NSW), Australia. Private native forests comprise indigenous species in a semi-natural formation on privately owned land. Such forests are usually uneven-aged, and regenerated naturally rather than by sowing or planting. These forests are of major conservation and commercial importance in NSW, covering 8 M ha and comprising one-third of all native forest in the state (Thompson 2007). The management and harvesting of these forests is known as PNF, and has been the focus of public attention for several years, as the desirability and …


Potential Contributions Of Statistics And Modelling To Sustainable Forest Managment: Review And Synthesis, Keith Rennolls, Margarida Tomé, Ronald E. Mcroberts, Jerome K. Vanclay, Valerie Lemay, Biing T. Guan, George Z. Gertner Dec 2006

Potential Contributions Of Statistics And Modelling To Sustainable Forest Managment: Review And Synthesis, Keith Rennolls, Margarida Tomé, Ronald E. Mcroberts, Jerome K. Vanclay, Valerie Lemay, Biing T. Guan, George Z. Gertner

Professor Jerome K Vanclay

This chapter provides a review of the statistical and modelling disciplines, their techniques and potential contribution to sustainable forest management (SFM). The main topics covered are:

Mensuration and models for sustainable forest management (SFM) Inventory and monitoring for forest sustainability: criteria and indicators Models of tropical forests for the conservation of biodiversity Integrating information and models across spatial and temporal scales for SFM Climate and carbon models in relation to sustainability New techniques for the statistical analysis of sustainability data Uncertainly analysis in modeling and monitoring for SFM Forest data, information and model archives

There are major contributions to be …


In The Heat Of The Law, It's Not Just Steam: Geothermal Resources And The Impact On Thermophile Biodiversity, Donald J. Kochan, Tiffany Grant Dec 2006

In The Heat Of The Law, It's Not Just Steam: Geothermal Resources And The Impact On Thermophile Biodiversity, Donald J. Kochan, Tiffany Grant

Donald J. Kochan

Significant research has been conducted into the utilization of geothermal resources as a ‘green’ energy source. However, minimal research has been conducted into geothermal resource utilization and depletion impacts on thermophile biodiversity. Thermophiles are organisms which have adapted over millions of year to extreme temperature and chemical compositions and exist in hot springs and other geothermal resources. Their ability to withstand high temperatures makes them invaluable to scientific and medical research. Current federal and California case law classify geothermal resources as a mineral, not a water resource. Acquisition of rights to develop a geothermal resource owned or reserved by the …