32 research outputs found
Awareness of breast cancer in women of an urban resettlement colony
Background: Breast cancer accounts for 19-34% of all cancer cases among
women in India. There is a high mortality due to late stage diagnosis
as patients usually present at an advanced stage because of lack of
awareness and non-existent breast cancer screening programs. Aim : To
determine the awareness about breast cancer among women in an urban
resettlement colony in Delhi. Settings and Design: A community based,
cross-sectional study carried out in a resettlement colony in South
Delhi. Materials and Methods: Semi-structured interview schedule was
used to collect information regarding breast cancer. Modified
Kuppuswamy scale was used for assessing the socio-economic status.
Results and Conclusions: A total of 333 women were included. The mean
age was 36 years\ub115.1 and 46% were illiterate. Only 185 (56%)
women were aware of breast cancer; among them, 51% knew about at least
one of the signs /symptoms, 53% were aware that breast cancer can be
detected early, and only 35% mentioned about risk factors. Thus,
awareness about breast cancer is low amongst women in this community.
There is a need for awareness generation programs to educate women
about breast cancer, propagation of correct messages and promote early
detection of breast cancer
Forkhead Transcription Factor Fd3F Cooperates with Rfx to Regulate a Gene Expression Program for Mechanosensory Cilia Specialization
Cilia have evolved hugely diverse structures and functions to participate in a wide variety of developmental and physiological processes. Ciliary specialization requires differences in gene expression, but few transcription factors are known to regulate this, and their molecular function is unclear. Here, we show that the Drosophila Forkhead box (Fox) gene, fd3F, is required for specialization of the mechanosensory cilium of chordotonal (Ch) neurons. fd3F regulates genes for Ch-specific axonemal dyneins and TRPV ion channels, which are required for sensory transduction, and retrograde transport genes, which are required to differentiate their distinct motile and sensory ciliary zones. fd3F is reminiscent of vertebrate Foxj1, a motile cilia regulator, but fd3F regulates motility genes as part of a broader sensory regulation program. Fd3F cooperates with the pan-ciliary transcription factor, Rfx, to regulate its targets directly. This illuminates pathways involved in ciliary specialization and the molecular mechanism of transcription factors that regulate them
Brane Dynamics in the Randall-Sundrum model, Inflation and Graceful Exit
We study the averaged action of the Randall-Sundrum model with a time
dependent metric ansatz. It can be reformulated in terms of a Brans-Dicke
action with time dependent Newton's constant. We show that the physics of early
universe, particularly inflation, is governed by the Brans-Dicke theory. The
Brans-Dicke scalar, however, quickly settles to its equilibrium value and
decouples from the post-inflationary cosmology. The deceleration parameter is
negative to start with but changes sign before the Brans-Dicke scalar settles
to its equilibrium value. Consequently, the brane metric smoothly exits
inflation. We have also studied the slow-roll inflation in our model and
investigated the spectra of the density perturbation generated by the radion
field and find them consistent with the current observations.Comment: Revised version, Accepted in Class. Quant. Gravit
Elecromagnetic Duality on the Light-Front in the Presence of External Sources
We investigate the issue of electromagnetic duality on the light front. We
work with Zwanziger's theory of electric and magnetic sources which is
appropriate for treating duality. When quantized on the light-front in the
light front gauge, this theory yields two independent phase space degrees of
freedom, namely the two transverse field components, the right number to
describe the gauge field sector of normal light-front QED and also the
appropriate commutator between them. The electromagnetic duality transformation
formulated in terms of them is similar in form to the Susskind transformation
proposed for the free theory, provided one identifies them as the dynamical
field components of the photon on the light-front in the presence of magnetic
sources. The Hamiltonian density written in terms of these components is
invariant under the duality transformation.Comment: 13 pages, revtex, Title and presentation slightly changed, main
results unchange
Delay-Induced Transient Increase and Heterogeneity in Gene Expression in Negatively Auto-Regulated Gene Circuits
A generic feature in all intracellular biochemical processes is the time required to complete the whole sequence of reactions to yield any observable quantity-from gene expression to circadian rhythms. This widespread phenomenon points towards the importance of time delay in biological functions. Theoretically time delay is known to be the source of instability, and has been attributed to lead to oscillations or transient dynamics in several biological functions. Negative feedback loops, common in biochemical pathways, have been shown to provide stability and withstand considerable variations and random perturbations of biochemical parameters. The interaction of these two opposing factors-of instability and homeostasis-are features that are widespread in intracellular processes. To test the effect of these divergent forces in the dynamics of gene expression, we have designed and constructed simple negatively auto-regulated gene circuits consisting of a basic regulator and transcriptional repressor module, and compared it with one, which has delayed repression. We show, both theoretically and experimentally, that delayed repression induces transient increase and heterogeneity in gene expression before the gain of stability effected by the negative feedback. This design, therefore, seems to be suitable for conferring both stability and variability in cells required for adaptive response to a noisy environment
Carbono orgĂąnico e biomassa microbiana do solo em plantios de Acacia mangium no Cerrado de Roraima
A net scale invariance behaviour in fractal scattering
954-956The scattering of a structure less particle from a cantor set type model fractal lattice has been studied. A partially integrated scattering cross-section has shown scale invariance property when plotted against the scattering angle for different initial kinetic energy values of the projectile
Using a functional enzyme model to understand the chemistry behind hydrogen sulfide induced hibernation
The toxic gas H2S is produced by enzymes in the body. At moderate concentrations, H2S elicits physiological effects similar to hibernation. Herein, we describe experiments that imply that the phenomenon probably results from reversible inhibition of the enzyme cytochrome c oxidase (CcO), which reduces oxygen during respiration. A functional model of the oxygen-reducing site in CcO was used to explore the effects of H2S during respiration. Spectroscopic analyses showed that the model binds two molecules of H2S. The electro-catalytic reduction of oxygen is reversibly inhibited by H2S concentrations similar to those that induce hibernation. This phenomenon derives from a weak, reversible binding of H2S to the FeII porphyrin, which mimics heme a3 in CcO's active site. No inhibition of CcO is detected at lower H2S concentrations. Nevertheless, at lower concentrations, H2S could have other biological effects on CcO. For example, H2S rapidly reduces FeIII and CuII in both the oxidized form of this functional model and in CcO itself. H2S also reduces CcO's biological reductant, cytochrome c, which normally derives its reducing equivalents from food metabolism. Consequently, it is speculated that H2S might also serve as a source of electrons during periods of hibernation when food supplies are low