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Search Results: 1 - 10 of 1515 matches for " Mariam Asseng Conde "
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Synthesis, Characterization and Antimicrobial Studies of Co(II), Ni(II), Cu(II) and Zn(II) Complexes of (E)-2-(4-Dimethylbenzydimino)-Glycylglycine, (Glygly-DAB) a Schiff Base Derived from 4-Dimethylaminobenzaldehyde and Glycylglycine  [PDF]
Maurice Kuate, Mariam Asseng Conde, Katia N. Nchimi, Awawou G. Paboudam, Sally-Judith E. Ntum, Peter T. Ndifon
International Journal of Organic Chemistry (IJOC) , 2018, DOI: 10.4236/ijoc.2018.83022
Abstract: A tridentate Schiff base ligand, (E)-2-(4-dimethylbenzydimino) glycylglycine (glygly-DAB), derived from the condensation of 4-Dimethylaminobenzaldehyde (DAB) and glycylglycine (glygly) together with its Co(II), Ni(II), Cu(II) and Zn(II) complexes have been synthesized and characterized using various physico-chemical methods including C,H,N elemental analysis, melting point determination, molar conductivity measurement, IR, 1H NMR and UV-Vis. The ligand and metal complexes were screened in vitro for antimicrobial and antifungal activities on four bacterial strains (Staphylococcus aureus, Escherichia coli, Salmonella thyphi and Pseudomonas aeruginosa) and two fungal strains (Candida albicans and Cryptococcus neoformans). glygly-DAB showed remarkable antifungal activities on all the fungal strains and antibacterial activities on one bacterial strain.
Synthesis and Crystal Structure of N-(2-Pyridylmethyl)-L-Alanine) Isothiocyanate Cobalt(III)  [PDF]
Sally-Judith E. Ntum, Awawou G Paboudam, Asseng M. Conde, Linda D. Nyamen, Aminou Mohamadou, James Raftery, Peter T. Ndifon
Crystal Structure Theory and Applications (CSTA) , 2017, DOI: 10.4236/csta.2017.63004
Abstract: The title compound, [N-(2-pyridylmethyl)-(L)-alanine]Co(III) thiocyanate (1) was obtained from the reaction of Co(OOCH3)2·H2O with the tridentate reduced Schiff base ligand, N-(2-pyridylmethyl)-(L)-alanine (L) and NH4SCN and characterized by elemental analysis, IR, UV-visible, TGA and single- crystal X-ray diffraction. Structural and spectroscopic analyses reveal [Co(L)2)]SCN to be monomeric with Cobalt(III) adopting a pseudo-octahedral geometry, coordinating to two reduce Schiff base ligands. In the crystal lattice, the thiocyanate anion forms an intermolecular SCN···HNamine hydrogen bond, while adjacent monomers are linked by intermolecular Ocarboxyl···HNamine···H-bonds to form a supramolecular network. This work is therefore undertaken in an
Solution Studies on Co(II), Ni(II), Cu(II), and Zn(II) Complexes of Hexamethylenetetramine in Aqueous and Non-Aqueous Solvents
Awawou G. Paboudam,Christian Gérard,Aminou Mohamadou,Moise O. Agwara,Mariam A. Conde,Peter T. Ndifon
International Journal of Inorganic Chemistry , 2014, DOI: 10.1155/2014/397132
Abstract: Potentiometric studies in aqueous medium and spectrophotometric study in non-aqueous medium were used to understand the behavior of hexamethylenetetramine (HMTA) complexes. The protometric studies of HMTA enabled us to confirm that only one basic site of this ligand is protonated in acidic medium and this ligand is decomposed in acidic medium. In aqueous medium, only hexa-aqua complexes in which HMTA is present in the second coordination sphere forming H-bonds with hydrogen atoms of coordinated and uncoordinated water molecules are obtained. In non-aqueous solvents, HMTA coordinates to metal ions displaying diversity in the structures of the resulting complexes in which HMTA can either be monodentate, bridged bidentate, tridentate, or tetradentate. 1. Introduction Hexamethylenetetramine (HMTA) is a heterocyclic ligand with four nitrogen donor atoms, having three rings merged in a chair conformation as shown in Figure 1. Figure 1: Structure of hexamethylenetetramine. HMTA can therefore form various metal complexes possessing interesting structural features and applications [1–5]. Hexamethylenetetramine as a ligand can bind either in a monodentate manner to a metal [6, 7], acting as bridging ligand linking two, three, or four metals [8–11], or bind to metal-containing species through the formation of hydrogen bonding [5, 12–16]. The combination of both covalent and hydrogen bonding in certain complexes of hexamethylenetetramine leads to the formation of three-dimensional structures that easily decompose by thermal treatment to give thin films of metal oxides [15, 16]. The formation of covalently bonded and hydrogen-bonded compounds of hexamethylenetetramine is influenced by several factors such as the nature of the solvent, steric hindrance of the counter ion, and the pH of the solution [17]. When water is used as the solvent during synthesis, metal-aqua complexes are obtained which bind to HMTA through H-bonds, forming ionic species [18]. When non-aqueous solvents are used for synthesis, metal-HMTA covalent species are formed [10, 15]. Recently, we reported the isolation of metal-HMTA covalently bonded species isolated from ethanol [19]. Metal-H2O-HMTA ionic species involving H-bonds isolated from ethanol/water mixture have also been reported [5, 12–16, 20]. We report here the results of the study on the influence of solvent on the electronic and structural properties of metal-HMTA complexes in aqueous and non-aqueous solvents. 2. Experimental 2.1. Chemicals All solvents were purified by conventional procedures [21] and distilled prior to use. All the
Adomian Decomposition Method for Solving Goursat's Problems  [PDF]
Mariam A. Al-Mazmumy
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.28134
Abstract: In this paper, Goursat’s problems for: linear and nonlinear hyperbolic equations of second-order, systems of nonlinear hyperbolic equations and fourth-order linear hyperbolic equations in which the attached conditions are given on the characteristics curves are transformed in such a manner that the Adomian decomposition method (ADM) can be applied. Some examples with closed-form solutions are studied in detail to further illustrate the proposed technique, and the results obtained indicate this approach is indeed practical and efficient.
Viruses in and out
Mariam Andrawiss
Genome Biology , 2002, DOI: 10.1186/gb-2002-3-10-reports4033
Abstract: Microbes are the smallest forms of life on earth. Some microbes are deadly, most are harmless, and some are extremely beneficial. They can be found anywhere - in air, water, plants, animals and humans - and fall into four major categories: fungi, protozoa, bacteria (including Archaea, in this context), and viruses, which are the smallest of all. The international meeting 'The world of microbes' was divided into congresses on mycology (on fungi), bacteriology and applied microbiology, and virology; I will focus on the latter here.Viruses are replicating microorganisms that are heavily dependent on the structural and metabolic components of the host cell. Viruses can infect bacteria, fungi, plants, invertebrates and vertebrates. Whatever the host, virus particles (or virions) must penetrate the cell and uncoat their structure to allow transcription and translation of their genomes by the viral and the host machinery. Once the viruses have replicated, new virions are released from the infected cells. Even though most viral infections result in no symptoms, many viruses can cause virulent disorders, such as acquired immune-deficiency syndrome (AIDS), hemorrhagic fever, yellow fever, rabies or poliomyelitis. Viruses are classified in different taxonomic groups on the basis of their structural, physicochemical and replicative characteristics, and the meeting sessions were organized along these lines; I will focus on the sessions on the movement of plant viruses and the structure, assembly and entry of some enveloped viruses that infect vertebrates.In contrast to animal viruses, which penetrate the cell after specific binding of a virion protein to a receptor on the cell surface, plant viruses enter cells in the first instance by passive diffusion through breaches in the cell wall. This is later followed by spreading of the virus from cell to cell in the plant through plasmodesmata, cytoplasmic connections through channels in the cell wall that provide communication betwee
EDITORIAL: Urgent need for addressing Reproductive Health (RH) related challenges in higher learning institutions in Ethiopia
DH Mariam
Ethiopian Journal of Health Development , 2012,
Editorial: Fostering public health leadership in Africa
DH Mariam
Ethiopian Journal of Health Development , 2012,
Stephen Cohen, The Idea of Pakistan
Mariam Mufti
South Asia Multidisciplinary Academic Journal , 2009,
Abstract: The central question that Stephen Cohen grapples with in his book, The Idea of Pakistan, is what is Pakistan? Is it a ‘rogue state’, ‘a delinquent nation’, ‘Taliban East’ a ‘failing state’ or just ‘misunderstood but an effective US ally’ (p. 2)? To probe beyond these descriptions of Pakistan, Cohen has two purposes in mind. First, he wants to demonstrate why Indian Muslims felt the need for a separate homeland to pursue their ‘civilizational destiny’. Second, he wants to narrate how the state...
Damascus: history through the plans :
Mariam Basheish
Historical Kan Periodical , 2009,
Abstract: / . . . ( - Damaski ) ( 2000 . ) . . " " ( - Shem) ( ) . ( - Darme eq) " " (Damascus) . ( ) " " 1979 .
We are young. We are trendy. Buy our product! The use of latinized Arabic in edited printed press in Egypt
Mariam Aboelezz
United Academics Journal of Social Sciences , 2012,
Abstract: In the past decade, Latinised Arabic (LA), a popular form of writing spoken Arabic online, has made the transition from online applications such as internet chat and text messaging to offline mediums. No longer exclusive to computer mediated communication, the diffusion of LA into everyday life has been reported across the Arab world. Today, LA is a popular form of graffiti and can be found in handwritten notes and advertisements. However, the most interesting development in the career of LA has perhaps been in Egypt, where this form has appeared in a number of edited, printed magazines. Some of these have emerged in the wake of the recent boom in the Egyptian publishing industry; while others had already been on the market for longer. In an attempt to investigate the implications of this trend and the motivation behind it, four magazines were singled out and interviewed on the basis of the quantity and consistency of LA use. All of the magazines used LA alongside English, and identified themselves either as English or mainly English magazines. The applications of LA varied from one magazine to another, as did the importance of LA to the magazine’s market identity. There is evidence that magazines seek to moderate the use of LA by implementing their own set of internal editing and spelling rules. The editors and writers in the four magazines were mostly in their twenties. There was also an overlap in the target audience; mainly Egyptian adolescents of the upper middle class. Readers’ feedback suggests a predominantly favourable attitude towards LA from this audience. Overall, the findings from the interviews reveal the increasing commercial and symbolic value of LA, and indicate its growing popularity and acceptability.
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