Headspace solid-phase microextraction (SPME) is a fast and simple sampling method for analysis of volatile compounds, but quantitation can be affected by sample matrix and sampling conditions. Sampling time and temperature are particularly important in controlling analyte response, and the effects vary for different compound classes and volatilities. Tests with model solutions containing a rang...

This study investigated the possible involvement of matrix metalloproteinase 9 (MMP-9) in cerebral vasospasm (CVS) after subarachnoid hemorrhage (SAH) in rats. The CVS model was established by injection of fresh autologous nonheparinized arterial blood into the cisterna magna. Experiment 1 aimed to investigate the timecourse of the MMP-9 expression in the basilar artery after SAH. In Experiment...

A very simple and quick analytical method, based on direct aqueous injection, for determination of halogenated solvents in refinery water and wastewater, is described. There is a need to determine halogenated solvents in refinery water streams, because they may originate from several processes. There is also a need to develop methods enabling VOX to be determined in samples containing oil fract...

We develop a novel and powerful technique for communication lower bounds, the pattern matrix method. Specifically, fix an arbitrary function f : {0, 1}n → {0, 1} and let Af be the matrix whose columns are each an application of f to some subset of the variables x1, x2, . . . , x4n. We prove that Af has bounded-error communication complexity Ω(d), where d is the approximate degree of f. This res...

In this paper we give a self-contained proof of Sherstov’s pattern matrix method. This theorem combines two main ideas—an extension of the discrepancy method known as the generalized discrepancy method and the notion of dual polynomials—with the techniques of matrix norms, Fourier analysis, and approximate degree. All together, this results in lower bounds on the randomized communication comple...

Dibutyl phthalate (DBP) is a phthalic acid ester and is widely used in polymeric products to make them more flexible. DBP is found in almost every plastic material and is believed to be persistent in the environment. Various analytical methods have been used to measure DBP in different matrices. Considering the ubiquitous nature of DBP, the most important challenge in DBP analyses is the contam...

Dibutyl phthalate (DBP) is a phthalic acid ester and is widely used in polymeric products to make them more flexible. DBP is found in almost every plastic material and is believed to be persistent in the environment. Various analytical methods have been used to measure DBP in different matrices. Considering the ubiquitous nature of DBP, the most important challenge in DBP analyses is the contam...

‎the global generalized minimum residual (gl-gmres)‎ ‎method is examined for solving the generalized sylvester matrix equation‎ ‎[sumlimits_{i = 1}^q {a_i } xb_i = c.]‎ ‎some new theoretical results are elaborated for‎ ‎the proposed method by employing the schur complement‎. ‎these results can be exploited to establish new convergence properties‎ ‎of the gl-gmres method for solving genera...

EVSTATIEVA, Y., M. BADALOVA, G. CHERNEV, D. NIKOLOVA and V. SAVOV, 2013. New hybrid matrix for immobilization of Trichoderma viride SL-45. Bulg. J. Agric. Sci., Supplement 2, 19: 120–122 In this work Trichoderma viride SL-45, was investigated in new a hybrid matrix by immobilizing method. Vegetative culture of this strain was immobilized in four variations of sol-gel hybrid silica materials, co...

Abstract The synthesized heterocyclic compound: 5-[4-bromobenzylidene amino)-1, 3, 4-thiadiazole-2-thiol abbreviated as BATT possessed good antibacterial activity for various Gram-negative and Gram-positive bacteria. In addition to potent antitumor breast cancer, the first time, novelty of this study is facile low-cost formulation safe drug delivery system (DDS) cancer from such simple compound...