1,224 research outputs found
Potential role of gut microbiota in induction and regulation of innate immune memory
The gut microbiota significantly regulates the development and function of the innate and adaptive immune system. The attribute of immunological memory has long been linked only with adaptive immunity. Recent evidence indicates that memory is also present in the innate immune cells such as monocytes/macrophages and natural killer cells. These cells exhibit pattern recognition receptors (PRRs) that recognize microbe- or pathogen-associated molecular patterns (MAMPs or PAMPs) expressed by the microbes. Interaction between PRRs and MAMPs is quite crucial since it triggers the sequence of signaling events and epigenetic rewiring that not only play a cardinal role in modulating the activation and function of the innate cells but also impart a sense of memory response. We discuss here how gut microbiota can influence the generation of innate memory and functional reprogramming of bone marrow progenitors that helps in protection against infections. This article will broaden our current perspective of association between the gut microbiome and innate memory. In the future, this knowledge may pave avenues for development and designing of novel immunotherapies and vaccination strategies
Shape Invariant Potential and Semi-Unitary Transformations (SUT) for Supersymmetric Harmonic Oscillator in T4-Space
Constructing the Semi - Unitary Transformation (SUT) to obtain the
supersymmetric partner Hamiltonians for a one dimensional harmonic oscillator,
it has been shown that under this transformation the supersymmetric partner
loses its ground state in T^{4}- space while its eigen functions constitute a
complete orthonormal basis in a subspace of full Hilbert space.
Keywords: Supersymmetry, Superluminal Transformations, Semi Unitary
Transformations.
PACS No: 14.80L
Electro-acoustic Scattering from a Pulsating Sphere
In this paper, we show the RCS enhancement due to the acoustic disturbances
around a pulsating sphere. The acoustic variation is modeled with the
dielectric inhomogeneities around the sphere caused by the pressure
fluctuations due to the acoustic source. RCS is computed for the modeled
dielectric pulsating sphere, a cube, and a cone on a cylinder across a
frequency band using Finite Difference Time Domain (FDTD) method. The RCS of
the pulsating sphere and other objects considered are dominated by the
background scattering from the pulsating object. In this work, we show that the
dielectric variation due to the acoustic source can be detected even if there
is no scattering from the object. The scattering from the dielectric variation
leads to the detection of Bragg scattering along with a significant increase in
RCS.Comment: 8 Page
A Comparative Study of Antioxidant Potential and Phytochemical Contents of different Extracts of Wild Nasturtium Officinale W T Aiton Collected from Kumaun Region of Uttarakhand
Nasturtium officinale W. T Aiton or “watercress” (Brassicaceae) is a nutritionally valuable plant that is the richest source of carotenoids, polyphenols, iron, calcium, iodine, folic acid, essential vitamins and minerals. It is traditionally used for their appetiser, anti-scorbutic, stimulant, diuretic and detoxifying properties. The present study was conducted to investigate the antioxidant potential, phytochemical contents (total phenolic, flavonoids and tannin contents) as well as a preliminary phytochemical screening of different extract of aerial parts of Nasturtium officinale collected from the Kumaun region. The different extracts showed significant antioxidant activity as well as total phenolic, flavonoids and tannin contents. The preliminary phytochemical screening showed the presence of several phytochemical constituents such as carbohydrates, proteins, amino acids, glycosides, alkaloids and others. The hydroalcoholic extract possess significantly (P<0.05) higher antioxidant potential with IC50 value (0.333 mg/ml, 0.509mg/ml)and EC50 value (3.537 mg/ml) by 2,2-diphenyl-1-picrylhydrazyl(DPPH), 2,2-azino-bis-(3-ethylbenzothiazoline-6-sulphonic acid)(ABTS), and ferric-reducing antioxidant power (FRAP) methods, respectively, as well as highest total tannin, flavonoid and phenolic contents among all the extracts. These results provide substantial evidence that the plant Nasturtium officinalehas antioxidant potential and valuable sources of phytochemicals
Generalized Electromagnetic fields in Chiral Medium
The time dependent Dirac-Maxwell's Equations in presence of electric and
magnetic sources are written in chiral media and the solutions for the
classical problem are obtained in unique simple and consistent manner. The
quaternion reformulation of generalized electromagnetic fields in chiral media
has also been developed in compact, simple and consistent manner
Cyto-histological correlation of salivary gland lesions- a prospective study in a tertiary care institute
Background: Fine needle aspiration cytology (FNAC) has an essential proven role in diagnosing most of the common and benign salivary gland lesions. However, limited cellularity and morphological heterogeneity of the lesion can pose diagnostic challenges. The present study was conducted in a tertiary care centre over a period of one year with an objective to study the cyto-morphological features of salivary gland lesions and correlate cytological findings with histopathology.Methods: The study was carried out over a period of one year from January 2014 to December 2014. FNA specimens obtained from 78 patients were analyzed. Of these, only 51 patients underwent biopsy or surgery and their specimens were subjected to histopathological examination. Validation of cytological diagnosis was done on the basis of histopathological diagnosis.Results: A total 78 patients with salivary gland lesions were subjected to FNAC. Non neoplastic lesions constituted 19 cases (25%) and benign lesions constituted 46 cases (80.70%). Malignant lesions constituted 11 cases (19.30%). Two cases were inconclusive due to inadequate aspirated material. Overall sensitivity, specificity and diagnostic accuracy were 95.98%, 99.20% and 98.09% respectively.Conclusions: FNAC continues to be an accurate diagnostic technique in the hands of an experienced cytopathologist. It is a highly sensitive and specific technique for rapid diagnosis of most of the salivary gland swellings
Ferromagnetism and ferroelectricity in highly resistive Pb(0.7)Sr(0.3)(Fe(0.012)Ti(0.988))O(3) nanoparticles and its conduction by variable-range-hopping mechanism
The enhancement in ferromagnetism and ferroelectricity at room temperature for Pb0.7Sr0.3�Fe0.012Ti0.988�O3 �PSFT� nanoparticles is proved by magnetization and polarization
hysteresis loop. The x-ray diffraction and micrograph show that the PSFT nanoparticles have distorted tetragonal single phase, and their average particle’s size is 8 nm. The effect of Sr content reduces the particle size, and hence the multiferroic system becomes more resistive, which
dominates the superparamagnetic/paraelectric relaxation. The variable-range-hopping conduction mechanism explained the high resistivity of PSFT nanoparticles, which suggests that the room temperature movement of electrons involves short-range order through defect states
Prevalence and genotype distribution of human papilloma virus in cervical samples of young married women: a hospital based prospective cross-sectional study
Background: The aim of the study was to determine the prevalence and genotypes of human papillomavirus (HPV) infection in the cervical samples of young married women at a tertiary care hospital in Chhattisgarh. A prospective cross-sectional observational study was performed in married women, aged 18 to 30 years.Methods: Relevant history was noted and cervical samples were collected and tested for HPV deoxyribonucleic acid (DNA) by polymerase chain reaction (PCR). Data was compiled to calculate the prevalence of HPV and the genotypic distribution.Results: The overall prevalence of HPV in this study was 22.73% and that of type 16 and 18 either alone or in combination with other subtypes was 17.26%. They were the commonest subtypes. HPV positivity was inversely related to education levels (Chi square, p=0.05). There was a significant difference in parity of women testing positive for HPV versus those negative for HPV (one tailed Pr (t<t)=0.03, 95% CI=1.445 to 1,865 at 108 degrees of freedom). No difference was observed between education and socio economic levels of positive versus negative women. Type 16 and 18 accounted for 76% of all HPV subtypes detected.Conclusions: The prevalence of HPV infection is high in Indian women. The high risk oncogenic types are the commonest subtypes. There is an urgent need to screen for the presence of high risk HPV infections in younger women so that they may be followed up more closely to prevent cervical cancers
Infergen stimulated macrophages restrict Mycobacterium tuberculosis growth by autophagy and release of nitric oxide
IFN alfacon-1 (Infergen) is a synthetic form of Interferon (IFN)-α2b. Infergen has immunomodulatory activity and is effective against hepatitis C virus. However, the effect of Infergen (IFG) on Mycobacterium tuberculosis (Mtb) has not yet been reported. Therefore, for the first time, we have studied the influence of IFG in constraining the survival of Mtb in human macrophages. We observed that IFG significantly enhanced the maturation and activation of macrophages. Further, it substantially augmented the secretion of IL-6, Nitric Oxide (NO) and antigen uptake. Moreover, macrophages exhibited remarkably higher bactericidal activity, as evidenced by reduction in the Mtb growth. Infergen-mediated mechanism was different from the type-1 interferons; since it worked through the activation of NF-κB, phosphorylation of STAT-3 and Akt-PI3K that improved the bactericidal activity through autophagy and NO release. In future, IFG immunotherapy can be a novel strategy for treating patients and controlling TB
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