Using plants and natural products as medicine is increasing every day. The reason might be a tendency that the societies mostly have toward natural and original products especially natural drugs. Essential oilsare referred to aromatic composition which is found in different parts of a plant and can be used for different remedial and hygienic purposes. One of the plants which have been used a lo...

the chemical composition of the essential oil of fruits of pimpinella haussknechtiiboiss.was studied by gc-ms. after gc-ms analysis, one unknown component (56.7%) was observed, which was not characterized in the gc-ms library. the essential oil of p.hauskenekhtii was injected to hplc using ymc-pak-sil column (250 × 20 mm) with gradient system of hexane (a), and hexane: ethyl acetate, 9:1 (b) to...

In this paper, we will use some new properties of non-compactness measure, in order to establish a description the M-essential spectrum for matrix operators on Banach spaces.

coumarins are bioactive secondary metabolites and could be found in the fruits of umbelliferae. prangos asperula boiss. is an iranian native plant which is found wild in many regions of iran. osthol, a prenylated coumarin, was isolated from the hexane extract of the fruits of p. asperula and its structure was elucidated using 1 hnmr, 13 cnmr, ir and ms spectra. the essential oil of the aerial p...

We consider the operator $${\cal H} = {\cal H}' -\frac{\partial^2\ }{\partial x_d^2} \quad\text{on}\quad\omega\times\mathbb{R}$$ subject to Dirichlet or Robin condition, where a domain $\omega\subseteq\mathbb{R}^{d-1}$ is bounded unbounded. The symbol ${\cal H}'$ stands for second order self-adjoint differential on $\omega$ such that spectrum of contains several discrete eigenvalues $\Lambda_{j...

In this paper, we investigate the stability of some essential spectra a 2x2 block operator matrices pencil with unbounded entries and non-diagonal domain (i.e consisting vectors which satisfy certain relations between their components) by using resolvent kind matrix in terms union restriction its diagonal operators entries. Furthermore, an example two-group transport pencils is presented to ill...