Effects of externally supplied protein on root morphology and biomass allocation in Arabidopsis

Growth, morphogenesis and function of roots are influenced by the concentration and form of nutrients present in soils, including low molecular mass inorganicN(IN, ammonium, nitrate) and organicN(ON, e. g. amino acids). Proteins, ON of high molecular mass, are prevalent in soils but their possible effects on roots have received little attention. Here, we investigated how externally supplied protein of a size typical of soluble soil proteins influences root development of axenically grown Arabidopsis. Addition of low to intermediate concentrations of protein (bovine serum albumen, BSA) to IN-replete growth medium increased root dry weight, root length and thickness, and root hair length. Supply of higher BSA concentrations inhibited root development. These effects were independent of total N concentrations in the growth medium. The possible involvement of phytohormones was investigated using Arabidopsis with defective auxin (tir1-1 and axr2-1) and ethylene (ein2-1) responses. That no phenotype was observed suggests a signalling pathway is operating independent of auxin and ethylene responses. This study expands the knowledge on N form-explicit responses to demonstrate that ON of high molecular mass elicits specific responses.

Power system stability of a small sized isolated network supplied by a combined wind-pumped storage generation system: a case study in the Canary Islands

Massive integration of renewable energy sources in electrical power systems of remote islands is a subject of current interest. The increasing cost of fossil fuels, transport costs to isolated sites and environmental concerns constitute a serious drawback to the use of conventional fossil fuel plants. In a weak electrical grid, as it is typical on an island, if a large amount of conventional generation is substituted by renewable energy sources, power system safety and stability can be compromised, in the case of large grid disturbances. In this work, a model for transient stability analysis of an isolated electrical grid exclusively fed from a combination of renewable energy sources has been studied. This new generation model will be installed in El Hierro Island, in Spain. Additionally, an operation strategy to coordinate the generation units (wind, hydro) is also established. Attention is given to the assessment of inertial energy and reactive current to guarantee power system stability against large disturbances. The effectiveness of the proposed strategy is shown by means of simulation results.

Descriptive catalogue of maps, atlases, globes, etc., pub. or supplied by Rand, McNally & Company ...

Mode of access: Internet.

An economical algorithm for the solution of elliptic difference equations independent of user-supplied parameters,

Extra t.p., with thesis statement, inserted.

The speeches of the Right Honorable William Huskisson, with a biographical memoir, supplied to the editor from authentic sources...

Mode of access: Internet.

Abridgement of Murray's English grammar, with an appendix, containing exercises in orthography, in parsing, in syntax, and in punctuation. Designed for the younger classes of learners. To which questions are added--punctuation, and the notes under rules in syntax, supplied from the author's large grammar. Being his own abridgement entire, rev., prepared, and adapted to the use of the "English exercises."

Mode of access: Internet.

Illustrated supplement to the descriptive catalogue published by Edmond Johnson ... of fac-simile reproductions of Irish antique art metal work : specially manufactured for exhibition at the World's Fair, Chicago, 1893; the International Exposition, Paris, 1900; and the International Exhibition, Glasgow, 1901; and as supplied to the principal museums of America, Great Britain, and the Continent /

Acquisition made accessible thanks to the generous support of the Frederick J. and Margret L. Worden Endowment.

An authentic biography of General La Fayette. In which many errors and deficiencies existing in the memoirs heretofore published, are corrected and supplied.

Mode of access: Internet.

The Horae Paulinae of William Paley, carried out and illustrated in a continuous history of the apostolic labours and writings of St. Paul : on the basis of the Acts, with intercalary matter of sacred narrative supplied from the epistles, and elucidated in occasional dissertations /

Half-title: The continuous history of St. Paul.

An examination of Commodore Porter's Exposition in which some of the errors and inaccuracies of that publication are rectified, and some of its deficiencies supplied.

Mode of access: Internet.