The ROL system is a novel deductive object-oriented database system that has been implemented at the University of Regina. It provides a uniform rule-based declarative language for deening, manipulating and querying databases, which integrates important features of deductive databases and object-oriented databases. It supports object identity, complex objects, classes, class hierarchies, multip...

To date, expression of the lipase from Rhizopus oryzae (ROL) in Escherichia coli always led to the formation of inclusion bodies and inactive protein. However, the production of active ROL and its precursor ProROL in soluble form was achieved when E. coli Origami(DE3) and pET-11d were used as expression systems.

Plants that are adapted to waterlogged conditions develop aerenchyma in roots for ventilation. Some wetland plant species also form an apoplastic barrier at the outer cell layers of roots that reduces radial oxygen loss (ROL) from the aerenchyma and prevents toxic compounds from entering the root. The composition of the apoplastic barrier is not well understood. One potential component is suber...

Resumen. Los Gatekeepers son personas que traspasan las fronteras organizacionales para recabar información relevante para el desempeño exitoso de un equipo responsable de un proyecto de innovación. Este artículo contiene un modelo de competencias para el rol de Gatekepeer, el cual es el resultado de una investigación cualitativa desarrollada mediante el estudio de cinco casos en empresas de ba...

ROL is a deductive object-oriented database system developed at the University of Regina. It supports important object-oriented features such as object identity, complex objects, classes, class hierarchies, multiple inheritance with overriding and blocking, and schema deenition. It also supports structured values such as functor objects and sets, providing powerful mechanisms for representing b...

Radial oxygen loss (ROL) has been suggested to be a major process to protect plants exposed to the anaerobic by-products of soil anaerobiosis. The aim of the present study was to test the effects of root ROL from two submerged plants (Hydrilla verticillata and Vallisneria spiralis) on the rhizosphere oxygen profile and rhizosphere microarea. Phospholipid fatty acids (PLFAs) of sediment samples ...

Computer simulations are used to study composition fluctuations in disordered diblock copolymer melts over a range of values of the chain length N, and test several theories for the structure factor S(q). Specifically, we test the random-phase approximation (RPA), which is based on a self-consistent field treatment of fluctuations, the Fredrickson-Helfand theory, which was designed to describe ...

Absorption of a photon by a rhodopsin or cone-opsin pigment isomerizes its 11-cis-retinaldehyde (11-cis-RAL) chromophore to all-trans-retinaldehyde (all-trans-RAL), which dissociates after a brief period of activation. Light sensitivity is restored to the resulting apo-opsin when it recombines with another 11-cis-RAL. Conversion of all-trans-RAL to 11-cis-RAL is carried out by an enzyme pathway...

Two kinds of cellular responses to auxin, the hyperpolarization of protoplasts and the division of protoplast-derived cells, were compared in Nicotiana tabacum plants transformed by different T-DNA fragments of Agrobacterium rhizogenes strain A4. Using transmembrane potential difference measurements to characterize hormonal sensitivity of mesophyll protoplasts, we found a 30-fold increase in se...

BACKGROUND Although an aggressive use of tretinoin along with hydroquinone enables an efficient treatment of hyperpigmented skin lesions, irritant dermatitis remains to be solved. OBJECTIVE To evaluate the efficiency and adverse effects of 10% all-trans retinol (ROL) gel for improvement of skin hyperpigmentation. METHODS Ten-percent ROL gel was used instead of 0.1% tretinoin gel in our two-...