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A new anti-inflammatory triterpene saponin isolated from Anabasis setifera
Allia M. Abdou,Hossam M. Abdallah,Mona A. Mohamed,Ghada A. Fawzy,Ashraf B. Abdel-Naim 대한약학회 2013 Archives of Pharmacal Research Vol.36 No.6
A bio-guided fractionation of Anabasis setiferaMoq. (Chenopodiaceae) for anti-inflammatory activity wascarried out using carrageenin rat paw edema model in rats. On the basis of percent edema inhibition after 3 h of carrageenininjection, n-butanol fraction showed promisingactivity through a significant (p\0.05) decrease in pawvolume by 85.6 % from control using indomethacin asreference standard. Moreover, the n-butanol fraction significantly(p\0.05) decreased PGE2 and TNF-a in theexudates of rat paw edema. Chemical investigation ofn-butanol fraction afforded a-amyrin 3-O-glucopyranoside(1), patuletin 7-O-glucopyranoside (2), myricitrin (3) and anew oleanane triterpene saponin derivative (4), sophradiol3-O-a-L-1C4-rhamnopyranosyl-(1000?400)-O-b-D-4C1-galactopyranosyl(100?60)-O-b-D-4C1-glucopyranoside. Thestructure of the new compound was determined by comprehensiveanalyses of their 1D and 2D NMR, massspectral data and comparison with previously known analogs. Only compound 4 revealed a significant (p\0.05)inhibition of cyclooxygenase 1 and 2 (COX) activities.
ON ASYMPTOTIC METHOD IN CONTACT PROBLEMS OF FREDHOLM INTEGRAL EQUATION OF THE SECOND KIND
Abdou, M.A. 한국전산응용수학회 2002 The Korean journal of computational & applied math Vol.9 No.1
Besides asymptotic method, the method of orthogonal polynomials has been used to obtain the solution of the Fredholm integral equation. The principal (singular) part of the kerne1 which corresponds to the selected domain of parameter variation is isolated. The unknown and known functions are expanded in a Chebyshev polynomial and an infinite a1gebraic system is obtained.
Al-Hakimi, Ahmed N.,Shakdofa, Mohamad M.E.,El-Seidy, Ahemd M.A.,El-Tabl, Abdou S. Korean Chemical Society 2011 대한화학회지 Vol.55 No.3
[ $N^1,N^2$ ]bis(3-((3-hydroxynaphthalen-2-yl)methylene-amino)propyl)phthalamide ($H_4L$, 1) 의 새로운 크롬(III), 망간(II), 철(III), 코발트(II), 니켈(II), 구리(II), 루테늄(III) 및 산화 지르코늄(II) 착물을 합성하여 원소분석, 물리적 성질 및 분광학적으로 특성을 규명하였다. 분광학적 결과를 통해 이 리간드는 $[H_4LMX_2(H_2O)]{\cdot}nH_2O$ (M = Cu(II), Ni(II), Co(II), X = Cl 또는 $NO_3$)의 일반식을 갖는 착물2-5에서는 중성의 삼배위 리간드로 행동한다. 또는 $[H_4L(ZrO)_2Cl_2]{\cdot}8H_2O$ 의 일반식을 갖는 착물 6-9 에서는 이염기성 육배위 리간드로 행동한다. DMF 용액에서의 몰전기전도도 실험결과 이들 착물은 비이온성을 나타낸다. 고체 구리착물 2, 5 및 6 의 ESR 스펙트럼에서 $g_{\parallel}$ >g> $g_e$을 보이는데, 이는 일그러진 팔면체구조와 큰 공유결합성을 갖는 $d{_x}^2{_{-y}}^2$ 오비탈에 비공유 전자쌍이 존재함을 의미한다. 이합체 구리(II) 착물 $[H_2LCu_2Cl_2(H_2O)_4]{\cdot}3H_2O$ (6)에 대해 두 구리원자 사이의 거리를 ESR 스펙트럼으로부터 추정한 parallel component 의 field zero splitting 파라메타를 이용하여 계산하였다. 이들 화합물의 항박테리아 및 항균 활성도를 측정한 결과, 몇가지 금속 착물의 경우 표준시약인 tetracycline (박테리아) 및 Amphotricene B (균류)보다 더 큰 저해효과를 보였다. Novel chromium(III), manganese(II), iron(III), cobalt(II), nickel(II), copper(II), ruthenium(III), and zirconyl(II) complexes of $N^1,N^2$-bis(3-((3-hydroxynaphthalen-2-yl)methylene-amino)propyl)phthalamide ($H_4L$, 1) have been synthesized and characterized by elemental, physical, and spectral analyses. The spectral data showed that the ligand behaves as either neutral tridentate ligand as in complexes 2-5 with the general formula $[H_4LMX_2(H_2O)]{\cdot}nH_2O$ (M=Cu(II), Ni(II), Co(II), X = Cl or $NO_3$), neutral hexadentate ligand as in complexes 10-12 with the general formula $[H_4LM_2Cl_6]{\cdot}nH_2O$ (M=Fe(III), Cr(III) or Ru(III)), or dibasic hexadentate ligand as in complexes 6-9 with the general formula $[H_2LM_2Cl_2(H_2O)_4]{\cdot}nH_2O$ (M = Cu(II), Ni(II), Co(II) or Mn(II), and 13 with general formula $[H_4L(ZrO)_2Cl_2]{\cdot}8H_2O$. Molar conductance in DMF solution indicated the non-ionic nature of the complexes. The ESR spectra of solid copper(II) complexes 2, 5, and 6 showed $g_{\parallel}$ >g> $g_e$, indicating distorted octahedral structure and the presence of the unpaired electron in the $N^1,N^2$ orbital with significant covalent bond character. For the dimeric copper(II) complex $[H_2LCu_2Cl_2(H_2O)_4]{\cdot}3H_2O$ (6), the distance between the two copper centers was calculated using field zero splitting parameter for the parallel component that was estimated from the ESR spectrum. The antibacterial and antifungal activities of the compounds showed that, some of metal complexes exhibited a greater inhibitory effect than standard drug as tetracycline (bacteria) and Amphotricene B (fungi).
ON A DISCUSSION OF NONLINEAR INTEGRAL EQUATIONOF TYPE VOLTERRA-HAMMERSTEIN
M. M. EL-Borai,M. A. Abdou,M. M. EL-Kojok 한국수학교육학회 2008 純粹 및 應用數學 Vol.15 No.1
Here, we consider the existence and uniqueness solution of nonlinear integral equation of the second kind of type Volterra-Hammerstein. Also, the nor- mality and continuity of the integral operator are discussed. A numerical method is used to obtain a system of nonlinear integral equations in position. The solution is obtained, and many applications in one, two and three dimensionals are considered.
ON A DISCUSSION OF NONLINEAR INTEGRAL EQUATION OF TYPE VOLTERRA-FREDHOLM
M. M. EL-Borai,M. A. Abdou,M. M. EL-Kojok 한국산업응용수학회 2006 Journal of the Korean Society for Industrial and A Vol.10 No.2-1
Here, we consider the existence and uniqueness solution of nonlinear integral equation of the second kind of type Volterra-Fredholm. Also, the normality and continuity of the integral operator are discussed. The solution is obtained, and many applications in one, two and three dimensionals are considered.
El-Tabl, Abdou S.,Shakdofa, Mohamad M.E.,El-Seidy, Ahmed M.A. Korean Chemical Society 2011 대한화학회지 Vol.55 No.6
A new series of manganese(II), iron(III) and cobalt(III) complexes of 14-membered macrocyclic ligand, (3,6,10,13,16,19-hexaazabicyclo[6.6.6]icosane-1,8-diamine) have been prepared and characterized by elemental analyses, IR, UV-VIS, $^1H$- and $^{13}C$- NMR spectra, magnetic susceptibilities, conductivities, and ESR measurements. Molar conductance measurements in DMF solution indicate that the complexes are electrolytes. The ESR spectrum for cobalt(III) complex in $CD_3OD+10%D_2O$ after exposure to $^{60}Co-{\gamma}$-rays at 77 K using a 0.2217 M rad $h^{-1}$ vicrad source showed $g_{\perp}$ > $g_{\parallel}$ > $g_e$, indicating that, the unpaired electron site is mainly present in the $d_z2$ orbital with covalent bond character. In this case, the ligand hyperfine tensors are nearly collinear with ${\gamma}$-tensors, so there is no major tendency to bend. Therefore, little extra delocalization via the ring lobe of the $dz^2$ orbital occurs. However, the ESR spectrum in solid state after exposure to $^{60}Co-{\gamma}$-rays at 77 K showed $g_{\parallel}$ > $g_{\perp}$ > $g_e$, indicating that, the unpaired electron site is mainly present in the $d_x2_{-y}2$ ground state as the resulting spectrum contains a large number of randomly oriented molecules provided that, the principle directions of g and A tensors. Manganese (II) complex 2, $[H_{12}LMn]Cl_4.2H_2O$, showed six isotropic lines characteristic to an unpaired electron interacting with a nucleus of spin 5/2, however, iron(III) complex 3, $[H_{12}LFe]Cl_5.H_2O$, showed spectrum of a high spin $^{57}Fe$ (I=1/2), $d^5$ configuration. The geometry of these complexes was supported by elemental analyses, IR, electronic and ESR spectral studies. Complex 1 showed exploitation in reducing the amount of electron adducts formed in DNA during irradiation with low radiation products.
Metwally, M.A.,Bondock, S.A.,El-Desouky, S.I.,Abdou, M.M. Korean Chemical Society 2012 대한화학회지 Vol.56 No.1
Novel azopyrazolin-5-one dyes 4a-f were synthesized by the regioselective reaction of phenylhydrazine with 2,3,4-chromantrione-3-arylhydrazones 2a-f. The acid dissociation constants $pK_a$ for the series prepared were determined and correlated by the Hammett equation. The results of such correlation together with the spectral data indicated that the studied compounds exist predominantly in the hydrazone keto structure, (D) as the Z-configuration. The dyes were applied to polyester fabrics, affording orange-yellow shades and assessments of their dyeing performance are considered. Further, the compounds 4a-f were screened for their antimicrobial activity against various microorganisms.
Metwally, M.A.,Bondock, S.,El-Desouky, S.I.,Abdou, M.M. Korean Chemical Society 2012 대한화학회지 Vol.56 No.3
In an attempt to find a new class of bisazo disperse dyes with better dyeing properties, a series of novel bisazo dyestuffs based on 4-arylhydrazono-3-(2'-hydroxyphenyl)-1-phenyl-2-pyrazolin-5-ones $\mathbf{3a-f}$ were prepared by diazocoupling of p-nitrophenyl diazonium chloride with 4-arylhydrazono-3-(2'-hydroxyphenyl)-1-phenyl-2-pyrazolin-5-ones $\mathbf{2a-f}$. Compounds $\mathbf{3a-f}$ were subsequently reacted with acetic anhydride in the presence of p-toluenesulfonic acid afford the corresponding O-acetyl derivatives $\mathbf{4a-f}$. The latter products as well as spectral data indicated that compounds $\mathbf{3a-f}$ exist predominantly in the azo-hydrazone tautomeric form (H) as the ZE-configuration. Additionally, two series of the synthesized dyes $\mathbf{3a-f}$ and $\mathbf{4a-f}$ were applied as disperse dyes for dyeing polyester fabrics and their fastness properties were evaluated. Also the position of color in CIELAB coordinates ($L^*$, $a^*$, $b^*$, $H^*$, $C^*$*) was assessed.
Numerical Solution For Fredholm Integral Equation With Hilbert Kernel
M.A.Abdou,F.A.Hendi 한국산업응용수학회 2005 Journal of the Korean Society for Industrial and A Vol.9 No.1
Here, the Fredholm integral equation with Hilbert kernel is solved numerically, using two different methods . Also the error ,in each case , is estimated.