Grapevine can be severely affected by phytoplasmas, which are phytopathogenic Mollicutes invading the sieve elements of the host plant. The biochemical and molecular relationships between phytoplasmas and their hosts remain largely unexplored. Equally unknown is an interesting aspect of the pathogen-plant interaction called "recovery," which is a spontaneous remission of symptoms in previously ...

The objective of this study was to evaluate the effect factors such as irrigation, variety and collection time on mineral contents olive leaves. highest Ca (31115.73 mg/kg), K (8398.34 mg/kg) S (1679.05 were determined in leaves Gemlik collected irrigated orchard. Olive Ayvalık grown orchard contained maximum levels Mg (3394.94 P (949.13 mg/kg). P, amounts leaves, general, showed an increase wi...

Plants of Coffea dewevrei De Wild. et Th. Durant var. excelsa Chev. growing in nursery beds in a lath house at the Instituto Agronomico, Campinas, Brazil, exhibit frequently a type of chlorosis in the leaves (1). Repeated attempts were made to improve the condition of the chlorotic plants by spraying their leaves with salt solutions of various elements, including iron, zinc, manganese, magnesiu...

A. Troncoso Centro de Edafologia y Biologia Aplicada del Quarto Sevi 11 a Spagna Two-year old, selfrooted olive plants (cv. "Frangivento") were grown in sand culture for three years with 7 nutritive solutions,which differed from the relative balances of couples of elements. Hoagland's solution was utilised as reference. Each thesis consisted in 24 plants, randomly divided in groups of six. Grow...

A new method for deriving universal R matrices from braid group representation is discussed. In this case, universal R operators can be defined and expressed in terms of products of braid group generators. The advantage of this method is that matrix elements of R are rank independent, and leaves multiplicity problem concerning coproducts of the corresponding quantum groups untouched. As example...

Mechanisms of uptake of rare earth elements (REEs) were investigated, particularly those by REE accumulator species (autumn fern). Rare earth elements are practically insoluble under natural conditions, suggesting some unknown mechanism in REE accumulator species. In the present investigation, two notable phenomena were observed. (I) Concerning the ionic-radius dependence of REE uptake by leave...

In this paper we present a method for representing complex façades. For this purpose we developed a hierarchical decomposition for the façade. The steps of the decomposition are represented as nodes in a typed graph where the leaves are the atomic façade elements. Every node includes necessary attributes for its façade structure. The edges in the graph depict adjacent façade elements providing ...

An important part of the modelling process applied to vegetation effects is aimed at analysing the radio propagation modes and the identification of individual signal contributions to the scattered signal caused by various elements of the tree. The paper describes detailed studies aimed at the wideband characterisation of propagation mechanisms arising in single trees. It explores effects of ge...

The main reasons for the fixation of some elements and consequently nutrient deficiencies, especially phosphorus, iron and zinc, are high levels of calcium (calcareous soils) and soil pH. Two sulfur fertilizers (sulfur alone and sulfur + organic material + Thiobacillus spp.) with two rates (2 and 4 kg sulfur/tree) were used to decrease soil pH and availability of P, Fe and Zn in apple trees dur...