Natural arylterpenes and their biological activity
Information on naturally occurring aromatic mono-, sesqui-, and diterpenes was systematized. The types of their biological activity and possible practical applications were described. Possible synthetic pathways to the most important terpenes were examined.
A new tetraprenylhydroquinone derivative with an acetic acid unit from the marine sponge Ircinia muscarum
A new linear tetraprenylhydroquinone derivative (3) with an acetic acid unit has been isolated from the marine sponge Ircinia muscarum. The structure of 3 was determined by spectral analysis.
Analysis of Macro and Micronutrients in Soils from Palestine Using Ion Exchange Membrane Technology
Ion Exchange membrane technology (IEM) is a method that allowed a single extraction process and a single subsequent measurement of different elements that are available in soil. The values of the available forms of the different macro- and micronutrients obtained by IEM extraction were compared with the values of the soluble form obtained by conventional extraction methods. In surface soil sample, the concentrations of available potassium, nitrate, phosphate, iron and boron were 37.7 mg kg–1, 17.5 mg kg–1, 3.6 mg kg–1, 171.0 μg kg–1, and 4.2 μg kg–1 respectively were greater than that of soluble forms of the same elements which were 7.0 mg kg–1, 9.2 mg kg–1, 0.4 mg kg–1, 109.0 μg kg–1, and 1.9 μg kg–1 respectively.