排序方式: 共有132条查询结果,搜索用时 15 毫秒
11.
This paper considers the boundary control problem of the generalized Korteweg–de Vries–Burgers (GKdVB) equation on the interval
[0, 1]. We derive a control law of the form and α is a positive integer, and prove that it guarantees L
2-global exponential stability, H
1-global asymptotic stability, and H
1-semiglobal exponential stability. Numerical results supporting the analytical ones for both the controlled and uncontrolled
equations are presented using a finite element method. 相似文献
12.
Ikram Allagui Mabrouk Horchani Nourhene Zammel Maroua Jalouli Abdelfatteh Elfeki Choumous Kallel Lamjed Mansour Salah Alwasel Abdel Halim Harrath Hichem Ben Jannet Mohamed Salah Allagui Kheiria Hcini 《Molecules (Basel, Switzerland)》2023,28(1)
In recent decades, the use of herbs and plants has been of great interest, as they have been the sources of natural products, commonly named as bioactive compounds. In specific, the natural compounds from the Capparaceae family which has been proved to have antioxidant, anti-inflammatory, antimicrobial and anti-carcinogenic activities, by several studies. Cleome arabica L. (CA) specie is the most used medicinal plants in Tunisia and elsewhere in North African countries for treatment of various diseases including diabetes, rheumatism, inflammation, cancer, and digestive disorders. The current work was undertaken to estimate the total phenolic, flavonoid and condensed tannin contents, to identify and quantify the polyphenolic compounds, and to evaluate the antioxidant and the anti-inflammatory proprieties of CA fruits extract against formalin induced chronic inflammation in Female Wistar rats. In fact, the antioxidant activity was tested by Diphenyl-1-Picrylhydrazyl free radical scavenging (DPPH), Ferric reducing antioxidant power (FRAP) and Nitric Oxide radical (NO·). Anti-inflammatory effect of fruits extract was examined using formalin (2%) induced paw edema in rats. Molecular docking tools were used to investigate the interaction of some compounds from CA fruits extract with the cyclooxygenase-2 (COX-2) target protein. Our results showed that, the total phenolic, flavonoid and tannins contents, which were assessed by the Folin-Ciocalteu, Quercetin, and Catechin methods, respectively, were 230.22 mg gallic acid equivalent/g dry weight (mg GAE/g DW), 55.08 mg quercetin equivalent/g dry weight (QE/g DW) and 15.17 mg catechin equivalents/g dry weight (CatE/g DW), respectively. HPLC analysis revealed the presence of five polyphenolic compounds whose catechin was found to be the most abundant compounds. The antioxidant activity of extract was quantified by DPPH, FRAP and NO· tests and IC50 reached the values of 3.346 mg/mL, 2.306 and 0.023 mg/mL, respectively. Cleome fruits ameliorated the histological integrity of the skin and alleviated the disruptions in hematological parameters (WBC, LYM, RBC, and HGB), inflammatory cytokines (IL-1β, IL-6, TNF-α), C-reactive protein, and some oxidative stress markers (TBARS (−49%) and AOPP (−42%) levels, SOD (+33%) and GPx (+75%) activities, and GSH (+49%) content) induced by formalin injection. Moreover, the in-silico investigation had shown that CA fruits extract compounds have a stronger interaction with COX-2 active site, more than the reference drug “indomethacin” (two H-bonds). Our research gives pharmacological backing to the healthcare utilization of Cleome plant in the treatment of inflammatory diseases and oxidative harm. 相似文献
13.
A selection of steroids, glycerides, clerodane diterpenoids, and a beta-hydroxy fatty acid methyl ester, all previously isolated from Ajuga pseudoiva leaves, were tested for their antibacterial activity toward three Gram- rods and one Gram+ coccus using the dilution method; MIC values were determined. The results suggested some importance for a free beta-hydroxy group in the fatty acid ester and also in the glycerides and clerodane derivatives; the absolute configurations of the latter, notably at C2, had little influence on activity. 相似文献
14.
Vincenzo Ambrosio Hichem Hajaiej 《Journal of Dynamics and Differential Equations》2018,30(3):1119-1143
This paper is concerned with the following fractional Schrödinger equation where \(s\in (0,1),N> 2s, (-\Delta )^{s}\) is the fractional Laplacian, k is a bounded positive function, \(h\in L^{2}(\mathbb {R}^{N}), h\not \equiv 0\) is nonnegative and f is either asymptotically linear or superlinear at infinity. By using the s-harmonic extension technique and suitable variational methods, we prove the existence of at least two positive solutions for the problem under consideration, provided that \(|h|_{2}\) is sufficiently small.
相似文献
$$\begin{aligned} \left\{ \begin{array}{ll} (-\Delta )^{s} u+u= k(x)f(u)+h(x) \text{ in } \mathbb {R}^{N}\\ u\in H^{s}(\mathbb {R}^{N}), \, u>0 \text{ in } \mathbb {R}^{N}, \end{array} \right. \end{aligned}$$
15.
Ben Rebah F Smaoui S Frikha F Gargouri Y Miled N 《Applied biochemistry and biotechnology》2008,151(1):71-79
The lipase inhibitory activity of ethanol extracts obtained from some marine algae collected on the Tunisian coast was evaluated.
Caulerpa prolifera extract markedly reduced both dog gastric (DGL) and human pancreatic lipase (HPL) activities. Generally, the inhibition reached
100% after 40 to 60 min of incubation depending on lipase types and on substrates used. Moreover, the inhibitory effect of
C. prolifera extract on lipases appeared to be accelerated by adding bile salts, which likely modified the interface and allowed the inhibitory
compound to inactivate the lipase. The separation of C. prolifera extract by thin-layer chromatography (TLC) resulted in eight fractions showing efficient inhibition rate against DGL, compared
to the crude extract. In the case of HPL, TLC fractionation reduced the inhibitory rates, suggesting that the effect of algal
extract on lipases may be caused by a synergetic action of several compounds within the extract. High-performance liquid chromatograph
separation resulted in isolation of a major compound displaying high inhibition capacity of HPL activity. Caulerpa prolifera extract may therefore be useful in developing antiobesity drugs. 相似文献
16.
17.
Hichem Eloussifi Jordi Farjas Pere Roura Mohamed Dammak 《Journal of Thermal Analysis and Calorimetry》2012,108(2):597-603
Suitable thermal treatment of metal organic precursors is a key process to obtain oxide films. To this purpose, non-isothermal
model-free predictions are specially suited. In this article we will explore the ability of these methods to provide an accurate
prediction of the evolution of the decomposition of yttrium trifluoroacetate, a precursor used in the synthesis of YBaCuO
superconducting thin-films. A good agreement has been obtained between the predicted and the measured reaction courses. 相似文献
18.
Hichem Eloussifi Jordi Farjas Pere Roura Jaume Camps Mohamed Dammak Susagna Ricart Teresa Puig Xavier Obradors 《Journal of Thermal Analysis and Calorimetry》2012,108(2):589-596
A detailed analysis of the thermal decomposition of yttrium trifluoroacetate under different atmospheres is presented. Thermogravimetry,
differential thermal analysis, and evolved gas analysis have been used for this in situ analysis. Solid residues at different
stages have been characterized by means of X-ray diffraction, elemental analysis, Fourier transform infrared spectroscopy,
and scanning electron microscopy. The first decomposition stage (310 °C) is exothermic and involves the complete removal of
carbon (organic part) and the formation of yttrium fluoride. This process is characterized by a fast mass loss rate. Afterwards,
yttria (Y2O3) is formed at 1200 °C through a slow process controlled by the out diffusion of fluorine that involves the formation of yttrium
oxyfluoride as an intermediate. The evolution of the mass during the decomposition and the structure of the yttria particles
is not affected by the presence of oxygen or water. However, when the oxygen (water) partial pressure is as low as 0.02% (<0.002%),
the kinetics and final particle structure are strongly affected. 相似文献
19.
Logistic chaotic maps for binary numbers generations 总被引:1,自引:0,他引:1
Two pseudorandom binary sequence generators, based on logistic chaotic maps intended for stream cipher applications, are proposed. The first is based on a single one-dimensional logistic map which exhibits random, noise-like properties at given certain parameter values, and the second is based on a combination of two logistic maps. The encryption step proposed in both algorithms consists of a simple bitwise XOR operation of the plaintext binary sequence with the keystream binary sequence to produce the ciphertext binary sequence. A threshold function is applied to convert the floating-point iterates into binary form. Experimental results show that the produced sequences possess high linear complexity and very good statistical properties. The systems are put forward for security evaluation by the cryptographic committees. 相似文献
20.
Mohammed Hichem Mortad 《Proceedings of the American Mathematical Society》2005,133(2):455-464
We give classes of unbounded real-valued for which is self-adjoint on , , where is the wave operator defined on .