We have synthesized some new compounds from 2-Acetyl Fluorene\ Thiophene
2-carbaldehyde chalcone via condensation and cyclization reactions between the chalcone and each of thiourea and urea, hydroxylamine hydrochloride and hydrazine hydrate, these
reactions afford these compounds:
3-(2-fluorenyl)-5-(2-thienyl) pyrazoline(4), 3-(2-fluorenyl)-5-(2-thienyl) Isoxazoline(3), 4-(2-fluorenyl)-6-(2-thienyl) pyrimidinone-2 (2) and 4-(2-fluorenyl)-6-(2-thienyl) pyrimidine-2 tione (1). Also 3-(2-fluorenyl)-5-(2-thienyl) isoxazole (5), were prepared via bromination of chalcon and cyclization the later with hydroxylamine hydrochloride.
Identification and determination of compounds structurs were carried out by (IR,
1H-NMR, 13C-NMR, LC-MS) spectrum Analysis.
The choloroformic extract of Pistacia Lentiscus L. is separated and
resulted in the isolation of one compound Abietadiene.
The structure of the compound was detrmained by spectroscopic
technique :
[ IR,1H-NMR,13C-NMR, DEPT(90º) , DEPT(135º), HMQC
,
HETCOR, 1H-1H COSY, HMBC, Mass. ]
A sensitive, simple, selective spectrophotometric method has been developed for determination Cobalt (II) with 1-(2-pyridylazo)-2 naphthol (PAN). This method ralies on the formation of stable red colored complex at pH=4.1 which has an absorption maximum at 580nm.
The purpose of this article is how to use HPLC technique for
quantitive analysis of cholesterol in some foods. The best conditions
are studied for this analysis including composition of mobile phase,
temperature, flow rate, the wavelength of detec
tor UV-VIS, and
acidity of mobile phase. The column used for cholesterol
determination by this method was: C18(5μm,250x4.6mm) with
injection volume of 20μL. Methanol 100% was used as mobile
phase.
The Xerogel alumina catalyst was prepared by sol-gel
method in non-aqueous milieu, and the aerogel alumina
catalyst was prepared in the same method but it was dried at
by supercritical conditions. These catalysts were characterized
by XRD, BET, a
nd chemical adsorption methods. The
obtained results were compared to show the effect of
preparation process on the structural properties of the alumina.
Besides these results were compared with some oxides
supported on alumina, and the effect of distribution of these
oxides on the properties of alumina was investigated too.
In this research we studied the mechanism of the reaction the solution ( Malonic acid , Zinc , Water ) by using different methods.
This research studied the impact of planting location and cooking time
periods of (5, 10, 15, 20 and 40 minutes) on the antioxidant effect, and on the
total Phenols and Flavonoids contents using five different samples of Syrian
onions. The results
showed that the total Phenols, total Flavonoids and
antioxidant activity contents were between (279-583)mg/100g dry wt, (80-180)mg/100g dry wt, and (60-75%) respectively. In addition, boiling for
different periods resulted in increased total Phenols from (383 to789)mg/100g
dry wt and in total Flavonoids from (124 to 205)mg/100g dry wt as well as an
increase of (77% to 88%) of antioxidant activity as measured using the DPPH
method.
This paper presents a study of the possibility of modifying the surface of
Syrian zeolite samples from anionic to cationic form using cationic surfactant
Hexadecyltrimethylammonium bromide (HDTMA-Br), in order to use the
modified zeolite in remova
l of anionic contaminants from polluted solutions.
Samples were obtained from Tel Mekhalat area and exploratory well No. 21 at
different depths.
This research aims to study the effects of some oxidoreductase enzymes
activity in the seedlings of maize plant stem cells, which Cultured in the present
of the following cations: Na+, K+, Mg2+, and Ca2+.
(GHOTA 82) yallow corn seeds were used, an
d cultured for six days in
water and in solution of cations with different concentrations.
In brief, preparation and titration processes consist of extraction of
enzymatic solutions from plant stem cells seedlings by buffer solutions (at
appropriate PH for each enzyme).
The results show that the activity of used enzymes increases with the
increasing concentrations of the used cations from 1 to 6 g/l by comparison with
those of cultured samples in water.
Besides the difference in the effect of cations was limited by the
concentrations range between 6-9 g/ l.
The linear alkyl benzene sulfonate is organic pollutants resulting from uses of detergents types. I have conducted several studies on the Mediterranean to monitor the concentrations of these pollutants, however, little is known about the fate of the
environment and the effect of environmental factors on the degradation these compounds.
In this research laboratory to conduct a study of the degradation of alkyl benzene sulfonate compounds under different conditions, during the period from September to November 2007 period cuddling continued for three months, and storage the samples in different conditions, (Laboratory conditions presence of light, laboratory conditions in isolation from the light at 25 C° and 15 C°) were identified in total concentration of LAS hydrological and specifications according to the following program:(0-1-3-5-7-14-21-30-45-60-90) day.
The results showed decrease total concentration of compounds LAS with the passage of time cuddling, compounds change specifications hydrological water by the biodegradation of the vital processes of photosynthesis taking place in aqueous media.
