DYNAMICS OF ABSORPTION OF SOME BIOGENIC SALTS IN MODIFIED SALINE MEDIUM

The measuring of Ca2+, Mg2+, K+ has been carried out. This quantity determination had two purposes. It allows us, on the one hand, to show that the assimilation rate of the studied mineral elements and the synthesis of the dry matter are in relation with the composition of the plant organs. On the other hand, to analyse the Na+/ NH4 + antagonism in constantly keeping the concentration of each anion and cation. Within the adjusted saline water T1C, T2C, T3C changing the proportion of NH4 + from 15% to 25% in the total mineral nitrogen of the modified saline solution T1 mod, T2mod, T3, mod. At the level of the two studied species, tomato and bean, the K+ is very abundant with regard to the cations Ca2+, Mg2+, and Na+ probably due to the weak capacity of the cationic root exchange of these plants. The roots of the tomato plants are less loaded with Na+ than the aerial parts. However, the bean stores much more Na+ at the level of the roots, which migrate with difficulty to the aerial parts [2]

Apps vs Devices: Can the usability of mobile apps be decoupled from the device?

In this paper we present a study using subjective measures to examine usability of mobile phone applications running on two different platforms, the OSX iPhone and an O2 Orbit running Windows Mobile operating system.The aim was to enhance the understanding of the influence of devices on mobile application usability.We gathered subjective measures using questionnaires to assess the satisfaction level while using mobile applications installed on two different devices.Results indicate that the device on which an application is installed strongly influence user satisfaction

Convexity-preserving Bernstein–Be´ zier quartic scheme

A C1 convex surface data interpolation scheme is presented to preserve the shape of scattered data arranged over a triangular grid. Bernstein–Be´ zier quartic function is used for interpolation. Lower bound of the boundary and inner Be´zier ordinates is determined to guarantee convexity of surface. The developed scheme is flexible and involves more relaxed constraints

INFLUENCE OF THE GIBBERELIC ACID ON THE GERMINATION OF THE SEEDS OF OLIVE-TREE Olea europea L.

Olea europea L. is a typical tree of the Mediterranean area where are concentrated 98% of the plantations and 90% of the world olive-growing production [6]. In Algeria, Olea europea L, arboricole species most significant following the surface occupies [14], which is 2,3% of the total surface of Algeria. Algerian oleiculture is divided into 3 zones: West, center and East. For his multiplication we used at olive- tree, two types of methods: in first the traditional methods (woody layering, division of the stocks, grafting) thus the vegetative way which is practised there or olivetree cultivates in an extensive way being intended for auto consumption and in second by modern methods carried out in seedbeds (layer herbaceous, sowing, grafting, culture in vitro) which is delicate but of prospect [6,8,9]. The modern methods of obtention of the improved plants and a good quality envisages utilisation of the cores to the reproduction. Out the cores of olive tree are reached by the phenomenon of dormancy, phenomenon which prevents obtention of the good results to the multiplication, reason for which the study of different the concentration from Gibberelic acid (GA3) on germination from the seeds of olive-tree, Chemlal variety, answered in Algeria was started. The results obtained are encouraging and deserve to be used in practice

INFLUENCE OF THE GIBBERELIC ACID ON THE GERMINATION OF THE SEEDS OF OLIVE-TREE Olea europea L.

Olea europea L. is a typical tree of the Mediterranean area where are concentrated 98% of the plantations and 90% of the world olive-growing production [6]. In Algeria, Olea europea L, arboricole species most significant following the surface occupies [14], which is 2,3% of the total surface of Algeria. Algerian oleiculture is divided into 3 zones: West, center and East. For his multiplication we used at olive- tree, two types of methods: in first the traditional methods (woody layering, division of the stocks, grafting) thus the vegetative way which is practised there or olivetree cultivates in an extensive way being intended for auto consumption and in second by modern methods carried out in seedbeds (layer herbaceous, sowing, grafting, culture in vitro) which is delicate but of prospect [6,8,9]. The modern methods of obtention of the improved plants and a good quality envisages utilisation of the cores to the reproduction. Out the cores of olive tree are reached by the phenomenon of dormancy, phenomenon which prevents obtention of the good results to the multiplication, reason for which the study of different the concentration from Gibberelic acid (GA3) on germination from the seeds of olive-tree, Chemlal variety, answered in Algeria was started. The results obtained are encouraging and deserve to be used in practice

Circular Arc Approximation by Quartic H-Bézier Curve

The quartic H-Bézier curve is used for the approximation of circular arcs. It has five control points and one positive real free parameter. The four control points are carried out b

Positive Data Visualization Using Trigonometric Function

A piecewise rational trigonometric cubic function with four shape parameters has been constructed to address the problem of visualizing positive data. Simple data-dependent constraints on shape parameters are derived to preserve positivity and assure smoothness. The method is then extended to positive surface data by rational trigonometric bicubic function. The order of approximation of developed interpolant is

DYNAMICS OF ABSORPTION OF SOME BIOGENICS SALTS AT TOMATO AND BEAN PLANT CULTIVATED IN SALINE MEDIUM

The study carried out on the mineral assimilation in saline environment by tomato and bean cultures allowed us to distinguish through the various studied stages, a specifi c assimilation of the mineral element Ca, Mg, K, Na. This study aimed at looking at how assimilation rate of the studied mineral element. The dry matter is in relation with the mineral composition of the plant organs

DYNAMICS OF ABSORPTION OF SOME BIOGENIC SALTS IN MODIFIED SALINE MEDIUM

The measuring of Ca2+, Mg2+, K+ has been carried out. This quantity determination had two purposes. It allows us, on the one hand, to show that the assimilation rate of the studied mineral elements and the synthesis of the dry matter are in relation with the composition of the plant organs. On the other hand, to analyse the Na+/ NH4 + antagonism in constantly keeping the concentration of each anion and cation. Within the adjusted saline water T1C, T2C, T3C changing the proportion of NH4 + from 15% to 25% in the total mineral nitrogen of the modified saline solution T1 mod, T2mod, T3, mod. At the level of the two studied species, tomato and bean, the K+ is very abundant with regard to the cations Ca2+, Mg2+, and Na+ probably due to the weak capacity of the cationic root exchange of these plants. The roots of the tomato plants are less loaded with Na+ than the aerial parts. However, the bean stores much more Na+ at the level of the roots, which migrate with difficulty to the aerial parts [2]