oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Search Results: 1 - 10 of 43 matches for " Najmuddin Saquib "
All listed articles are free for downloading (OA Articles)
Page 1 /43
Display every page Item
Pathogenicity of Mycobacterium tuberculosis Is Expressed by Regulating Metabolic Thresholds of the Host Macrophage
Parul Mehrotra equal contributor,Shilpa V. Jamwal equal contributor,Najmuddin Saquib,Neeraj Sinha,Zaved Siddiqui,Venkatasamy Manivel,Samrat Chatterjee,Kanury V. S. Rao
PLOS Pathogens , 2014, DOI: doi/10.1371/journal.ppat.1004265
Abstract: The success of Mycobacterium tuberculosis as a pathogen derives from its facile adaptation to the intracellular milieu of human macrophages. To explore this process, we asked whether adaptation also required interference with the metabolic machinery of the host cell. Temporal profiling of the metabolic flux, in cells infected with differently virulent mycobacterial strains, confirmed that this was indeed the case. Subsequent analysis identified the core subset of host reactions that were targeted. It also elucidated that the goal of regulation was to integrate pathways facilitating macrophage survival, with those promoting mycobacterial sustenance. Intriguingly, this synthesis then provided an axis where both host- and pathogen-derived factors converged to define determinants of pathogenicity. Consequently, whereas the requirement for macrophage survival sensitized TB susceptibility to the glycemic status of the individual, mediation by pathogen ensured that the virulence properties of the infecting strain also contributed towards the resulting pathology.
Effect of Coal Smoke Pollution on the Biomass and Chlorophyll Pigments of Brassica juncea
Mohammad Saquib
Ecoprint: An International Journal of Ecology , 2008, DOI: 10.3126/eco.v15i0.1935
Abstract: Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable{mso-style-name:"Table Normal";mso-tstyle-rowband-size:0;mso-tstyle-colband-size:0;mso-style-noshow:yes;mso-style-parent:"";mso-padding-alt:0cm 5.4pt 0cm 5.4pt;mso-para-margin:0cm;mso-para-margin-bottom:.0001pt;mso-pagination:widow-orphan;font-size:10.0pt;font-family:"Times New Roman";mso-ansi-language:#0400;mso-fareast-language:#0400;mso-bidi-language:#0400;} The effect of coal smoke pollution on the biomass and chlorophyll pigments of Brassica juncea were studied at 0.5, 2, 4, 6 and 20 km distance leeward from a thermal power plant complex. The root, shoot and total biomass and chlorophyll a, chlorophyll b and total chlorophyll were significantly reduced up to a distance of 4 km from the source of pollution. The data indicates that the degree of response increased with decreasing distance from the source of pollution in comparison to the reference site ‘c' situated at 20 km. Biomass and chlorophyll pigments showed a significant and positive relationship with the distance from the source. Key words : Air pollution, Brassica juncea , biomass, chlorophyll. ? doi: 10.3126/eco.v15i0.1935 ECOPRINT 15: 1-6, 2008
Chow groups and higher congruences for the number of rational points on proper varieties over finite fields
Najmuddin Fakhruddin
Mathematics , 2005,
Abstract: Given a proper family of varieties over a smooth base, with smooth total space and general fibre, all over a finite field k with q elements, we show that a finiteness hypothesis on the Chow groups, CH_i, i=0,1,...,r, of the fibres in the family leads to congruences mod q^{r+1} for the number of rational points in all the fibres over k-rational points of the base. These hypotheses on the Chow groups are expected to hold for families of low degree intersections in many Fano varieties leading to a broad generalisation of the theorem of Ax--Katz, as well as results of the author and C. S. Rajan. As an unconditional application, we give an asymptotic generalisation of the Ax--Katz theorem to low degree intersections in a large class of homogenous spaces.
The algebraic dynamics of generic endomorphisms of P^n
Najmuddin Fakhruddin
Mathematics , 2012,
Abstract: We investigate some general questions in algebraic dynamics in the case of generic endomorphisms of projective spaces over a field of characteristic zero. The main results that we prove are that a generic endomorphism has no non-trivial preperiodic subvarieties, any infinite set of preperiodic points is Zariski dense and any infinite subset of a single orbit is also Zariski dense, thereby verifying the dynamical "Manin--Mumford" conjecture of Zhang and the dynamical "Mordell--Lang" conjecture of Denis and Ghioca--Tucker in this case.
Zero cycles on generic hypersurfaces of large degree
Najmuddin Fakhruddin
Mathematics , 2002,
Abstract: We show that given a smooth projective variety X over C with dim(X) > 2, an ample line bundle O(1) on X and an integer n > 1, any n distinct points on a generic hypersurface of degree d in X are linearly independent in CH_0(X) if d >> 0. This generalizes a result of C. Voisin.
Torelli's theorem for high degree symmetric products of curves
Najmuddin Fakhruddin
Mathematics , 2002,
Abstract: We show that two smooth projective curves C_1 and C_2 of genus g which have isomorphic symmetric products are isomorphic unless g=2. This extends a theorem of Martens.
Multiplication maps of linear systems on smooth projective toric surfaces
Najmuddin Fakhruddin
Mathematics , 2002,
Abstract: Let X be a smooth projective toric surface and L and M two line bundles on X. If L is ample and M is generated by global sections, then we show that the natural map from H^0(X,L) tensor H^0(X,M) to H^0(X, L tensor M) is surjective. We also consider a generalization to the case when M is an arbitrary line bundle with h^0(X,M) > 0.
Questions on self maps of algebraic varieties
Najmuddin Fakhruddin
Mathematics , 2002,
Abstract: In this note we discuss some arithmetic and geometric questions concerning self maps of projective algebraic varieties.
Boundedness results for periodic points on algebraic varieties
Najmuddin Fakhruddin
Mathematics , 2002,
Abstract: We prove that if f is a self-map of an algebraic variety over a field K, then under certain conditions on X, f and K the set of possible periods of K-valued periodic points of f is finite.
Restriction of sections of abelian schemes
Najmuddin Fakhruddin
Mathematics , 2003,
Abstract: We prove the following result: Let B be a smooth, irreducible, quasi-projective variety over the complex numbers and assume that B has a projective compactification \bar{B} such that \bar{B} - B is of codimension at least two in \bar{B}. Then there exists a family of smooth ireducible curves {C_q}_{q \in Q} in B parametrised by an irreducible variety Q such that if p: A \to B is an abelian scheme and q \in Q is a generic point, then the restriction map on sections A(B) \to A(C_q) is an isomorphism. This answers, in a special case, a question of Graber, Harris, Mazur and Starr.
Page 1 /43
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.