检索结果-南通市图书馆

Stability of within host hTLV-I/hIV-1 co-infection in the presence of macrophages

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2023年第1期16卷 129-156页

作者： A.m.elaiw N.h.Alshamrani e.Dahy A.A.Abdellatif Department of mathematics Faculty of Science King Abdulaziz University P.0.Box 80203Jeddah 21589Saudi Arabia Department of mathematics Faculty of Science Al-Azhar University Assiut BranchAssiutEgypt Department of mathematics Faculty of Science University of Jeddah P.O.Bor 80327Jeddah 21589Saudi Arabia

The main target of both human immunodeficiency virus type 1(hIV-1)and human Tlymphotropic virus type I(hTLV-I)is the CD4+T cell which is considered the key player in the immune ***,hIV-1 has another target that is the *** present paper aims to formulate and develop a mathematical model to analyze the interaction of two viruses,hIV-1 and hTLV-I with the immune *** determine a bounded domain for the concentrations of the model's *** discuss the dynamical behavior of the model and analyze the existence and stability of the system's steady *** global asymptotic stability of all steady states is proven by utilizing the Lyapunov *** also demonstrate the dynamical behavior of the system *** significant impact of macrophages on the hTLV-I/hIV-1 co-infection dynamics is *** developed model will contribute to the understanding of hTLV-I/hIV-1 co-infection dynamics and help to choose different treatment strategies against hIV-1 and hTLV-I.

关键词： Viral co-infection CD4+T cells macrophages Lyapunov function global stability

Dust Acoustic Solitary Waves in Saturn F-ring's Region

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2011年第1期55卷 143-150页

作者： e.K.el-Shewy m.I.Abo el maaty h.G.Abdelwahed m.A.elmessary Theoretical Physics Group Faculty of ScienceMansoura University mathematics and Physics Department Faculty of engineering Mansoura University

effect of hot and cold dust charge on the propagation of dust-acoustic waves （DAWs） in unmagnetized plasma having electrons, singly charged ions, hot and cold dust grains has been investigated. The reductive perturbation method is employed to reduce the basic set of fluid equations to the Kortewege-de Vries （KdV） equation. At the critical hot dusty plasma density Nho, the KdV equation is not appropriate for describing the system. hence, a set of stretched coordinates is considered to derive the modified KdV equation. It is found that the presence of hot and cold dust charge grains not only significantly modifies the basic properties of solitary structure, but also changes the polarity of the solitary profiles. In the vicinity of the critical hot dusty plasma density Nho, neither KdV nor mKdV equation is appropriate for describing the DAWs. Therefore, a further modified KdV （fmKdV） equation is derived, which admits both soliton and double layer solutions.

关键词： dust-acoustic waves hot and cold dust charge double layer solutions

Use of two fungal species to induce agarwood resin formation in Gyrinops walla

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2019年第2期30卷 721-726页

作者： S.m.C.U.P.Subasinghe h.I.D.hitihamu K.m.e.P.Fernando Department of Forestry and environmental Science University of Sri Jayewardenepura Department of Botany University of Sri Jayewardenepura

Gyrinops walla Gaertn. is the only species growing in Sri Lanka that belongs to the agarwood family,Thymelaeaceae. Although agarwood resin induction and extraction from Aquilaria species of the same family have been practised for many decades in Southeast Asian region,the ability of producing agarwood resins in G. walla was discovered recently. Since previous studies were on agarwood resins formed due to natural causes, the present study was conducted to identify the potential fungal species that are capable of artificially inducing agarwood resin formation in G. walla. Since this is the first ever study conducted on artificial inducement of agarwood resin formation in ***, Aspergillus niger and Fusarium solani were selected owing to their high abundance in the naturally formed agarwood resinous tissues collected from 25 G. walla *** fungal species were separately grown in yeast extract glucose agar and used to inoculate healthy G. walla trees under aseptic conditions. Three holes were made for each tree and 2 g of fungal culture including the medium were placed in each hole. Tissue discoloration, characteristic aroma, resin content and resin constituents were checked at10 cm intervals above and below the inoculation points for a period of 1 year. Results revealed that tissue discoloration and resin content were higher in the trees inoculated with A. niger. Other than at 10 cm above and below the inoculation points, samples collected at all locations had significantly higher resin contents when inoculated with A. niger compared to F. solani. Sixteen agarwood resin constituents, which were also recorded in Aquilaria species, were identified from the discolored tissues using GC–mS analysis. Jinkohol, agarospirol and 2(2-phenyl)chromone derivatives were found in all discolored tissues collected at 10-cm intervals of the trees inoculated with both fungi. b-Seline, c-eudesmol and valerenal were found in nine of 10 sample points on the stem. c-elemene was recor

关键词： Gyrinops walla Agarwood resin Aspergillus niger Fusarium solani Inoculation

Relationship between Corneal Thickness,Corneal Curvature,and Intraocular Pressure before and after Laser Treatment for Simple myopia

在线全文

学校读者我要写书评

暂无评论

eye Science 2014年第2期29卷 70-73页

作者： Ahmad m.A edrees m.h Jafarzadehpur e Department of medical Physics University of Zakho Department of Physics College of Education Salahaddin University-Hawler Department of Optometry Iran University of Medical Science

Purpose:.To determine the relationship of central corneal thickness(CCT), curvature(CC), and intraocular pressure(IOP) as determinative factors for corneal biomechanics and in refractive ***:.The study investigated 48 eyes from subjects who visited the excimer Laser Surgery Clinic at the Department of Ophthalmology. The refractive error, IOP, CCT, and CC were measured in all participants. After 3 months, all examinations were ***:.Linear regression demonstrated a significant positive relationship between pre- and postoperative CCT,.CC,.and IOP values..The IOP showed a significant correlation with CCT(P=0.033) for pre-PRK, but no significant relationship was seen post-PRK. The CCT also correlated significantly with CC both pre- and post-PRK(Phe IOP was significantly correlated with CCT before PRK, but its behavior differed after surgery. Nearly the same correlation was seen between CCT and CC before and after the PRK;.nevertheless,.IOP measurements should be calculated or estimated more precisely after PRK based on CCT corrections.

关键词：膜厚度激光治疗角膜内压激光手术曲率近视线性回归分析

Ponatinib and gossypol act in synergy to suppress colorectal cancer cells by modulating apoptosis/autophagy crosstalk and inhibiting the FGF19/FGFR4 axis

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Biomedicine 2023年第3期13卷 131-138页

作者： Naglaa m.el-Lakkany hadeel h.elkattan Alaa e.elsisi Department of Pharmacology Theodor Bilharz Research InstituteWarrak El-HadarImbabaGiza 12411Egypt Department of Pharmacology and Toxicology Faculty of PharmacyTanta UniversityTantaEgypt

Objective:To evaluate the efficacy of ponatinib plus gossypol against colorectal cancer hCT-116 and Caco-2 ***:Cells were treated with ponatinib and/or gossypol at increasing concentrations to evaluate synergistic drug interactions by combination *** viability,FGF19/FGFR4,and apoptotic and autophagic cell death were ***:Ponatinib(1.25-40μm)and gossypol(2.5-80μm)monotherapy inhibited hCT-116 and Caco-2 cell viability in a doseand time-dependent *** combination of ponatinib and gossypol at a ratio of 1 to 2 significantly decreased cell viability(Ph a>2-and>4-fold reduction in IC50,respectively,after 24 h and 48 h,as compared to the IC50 of *** combined concentrations showed greater synergism(combination indexh a higher ponatinib dose reduction ***,ponatinib plus gossypol induced morphological changes in hCT-116and Caco-2 cells,increased beclin-1 and caspase-3,and decreased FGF19,FGFR4,Bcl-2 and p-Akt as compared to treatment with drugs ***:Gossypol enhances ponatinib's anticancer effects against colorectal cancer cells through antiproliferative,apoptotic,and autophagic *** may open the way for the future use of ponatinib at lower doses with gossypol as a potentially safer targeted strategy for colorectal cancer treatment.

关键词： Autophagy Apoptosis Cell viability FGF19/FGFR4 Gossypol Ponatinib hCT-116 Caco-2 Colorectal cancer

hydrogen storage of mgi-xmxh2 （m--Ti, V, studied using first-principles calculations re）

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2012年第9期21卷 477-483页

作者： m.Bhihi m.Lakhal h.Labrim A. Benyoussefa A.eI Kenz O.mounkachi e.K.hlil Laboratoire de magnetisme et de Physique des hautes energies associe au CNRST (URAC 12) Departement de PhysiqueB.P. 1014 Faculte des Sciences Universite Mohammed V-Agdal Rabat Morocco National Centre for energy Sciences and Nuclear Techniques ONESTEN Morocco Institute of Nanomaterials and Nanotechnologies MACslR Rabat Morocco hassan II Academy of Science and Technology Rabat Morocco Institut N6el CNRS-UJF 38042 Grenoble Cedex 9 France

In this work, the hydrogen storage properties of the mg-based hydrides, i.e., mgl-xmxh2 （m=Ti, V, Fe, 0≤ x ≤ 0.1）, are studied using the Korringa-Kohn-Rostoker （KKR） calculation with the coherent potential approximation （CPA） . In particular, the nature and concentrations of the alloying elements and their effects are studied. moreover, the material＇s stability and hydrogen storage thermodynamic properties are discussed. In particular, we find that the stability and the temperature of desorption decrease without significantly affecting the storage capacities.

关键词： first-principles calculation formation energy electronic structure hydrogen storage

源自天然席夫碱的过渡金属配合物在分光光度法测天然水中的Fe(Ⅲ)的应用(英文)

在线全文

学校读者我要写书评

暂无评论

无机化学学报 2012年第7期28卷 1495-1505页

作者： Khalil m m h mohamed G G Ismail e h Zayed m e Kamel B A 艾因·夏姆斯大学理学院化学系埃及开罗11566 开罗大学理学院化学系埃及吉萨12613 国家研究中心 Dokki埃及吉萨12613

描述了一种新颖、简便的合成含五齿配位基的大环席夫碱配体的方法,制备和表征了该席夫碱的1∶1包合物。用化学和光谱学方法测定了标题配合物的组成,认为在所有配合物中配位金属原子取八面体结构。数据表明:配体起O2N4六齿结构而每个环... 详细信息

描述了一种新颖、简便的合成含五齿配位基的大环席夫碱配体的方法,制备和表征了该席夫碱的1∶1包合物。用化学和光谱学方法测定了标题配合物的组成,认为在所有配合物中配位金属原子取八面体结构。数据表明:配体起O2N4六齿结构而每个环绕金属原子在八面体环境中。配合物的红外和1h NmR光谱符合中心金属原子的配位结果。用分光光度法测定了配合物的稳定常数。用共轭余量法(CR method)计算了在热分解的不同阶段配合物活化的动力学和热力学参数。此外,用抑菌圈直径法筛选了配体及其金属配合物抑制细菌和真菌的能力。用回收率试验研究了天然螯合配体在不同天然水体中对Fe(Ⅲ)离子配合作用的影响。

关键词：席夫碱配合物光谱学技术生物活性回收率

Rock composition and origin of the Duwi Formation calcareous rocks, Upper egypt

在线全文

学校读者我要写书评

暂无评论

Chinese Journal Of Geochemistry 2005年第4期24卷 316-326页

作者： Baioumy h.m. Attia A.m. Boulis S.N. hassan m.S. helmy m.e. Central metallurgical Research and Development Institute 87 Helwan Cairo EgyptCentral Metallurgical Research and Development Institute 87 Helwan Cairo EgyptCentral Metallurgical Research and Development Institute 87 Helwan Cairo EgyptCentral Metallurgical Research and Development Institute 87 Helwan Cairo EgyptGeology Dept. Faculty of Science Ain Shams University Abbasia Cairo Egypt

Upper Cretaceous phosphorite beds of the Duwi Formation, Upper egypt, are intercalated with limestone, sandy limestone, marl, calcareous shales, and calcareous sandstone. Calcareous intercalations were subjected to field and detailed petrographic, mineralogical and geochemical investigations in order to constrain their rock composition and origin.; mineralogically, dolomite, calcite, quartz, francolite and feldspars are the non-clay minerals. Smectite, kaolinite and illite represent the clay minerals. major and trace elements can be classified as the detrital and carbonate fractions based on their sources. The detrital fraction includes the elements that are derived from detrital sources, mainly clay minerals and quartz, such as Si, Al, Fe, Ti, K, Ba, V, Ni, Co, Cr, Zn, Cu, Zr, and mo. The carbonate fraction includes the elements that are derived from carbonates, maily calcite and dolomite, such as Ca, mg and Sr. ; Dolomite occurs as being dense, uniform, mosaic, very fine-to-fine, non-ferroan, and non-stoichiometrical, suggesting its early diagenetic formation in a near-shore oxidizing shallow marine environment. The close association and positive correlation between dolomite and smectite indicates the role of clay minerals in the formation of dolomite as a source of mgh-rich solutions.; Calcareous rocks were deposited in marine, oxidizing and weakly alkaline conditions, marking a semi-arid climatic period. The calcareous/argillaceous alternations are due to oscillations in clay/carbonate ratio.

关键词：岩石埃及石灰质白云石成岩作用

h∞ synchronization of chaotic neural networks with time-varying delays

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2013年第11期22卷 244-252页

作者： O. m. Kwon m. J. Park Ju h. Park S. m. Lee e. J. Cha School of electrical engineering Chungbuk National University Department of electrical engineering Yeungnam University School of electronic engineering Daegu University Department of Biomedical engineering School of Medicine Chungbuk National University

In this paper, we investigate the problem of h∞ synchronization for chaotic neural networks with time-varying delays. A new model of the networks with disturbances in both master and slave systems is presented. By constructing a suitable Lyapunov–Krasovskii functional and using a reciprocally convex approach, a novel h∞ synchronization criterion for the networks concerned is established in terms of linear matrix inequalities （LmIs） which can be easily solved by various effective optimization algorithms. Two numerical examples are given to illustrate the effectiveness of the proposed method.

关键词： chaotic neural networks time-varying delays h∞ synchronization Lyapunov method