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Articles by S.K. Shukla
Total Records ( 5 ) for S.K. Shukla
  H. Das , S.U. Ahmed , S.K. Shukla , S. Shukla , A. Latif and D. Sharma
  Mastitis represents a failure of innate immune mechanism of udder teat canal epithelial cells and peripheral PMN cells, whose cationic peptides constituted innate immunity. An attempt was made to examine in the year 2007, the actual presence of β-defensins peptides in milk of mastitis-affected buffalo (Bubalus bubalis), due to lack of such information. AU-PAGE revealed higher frequency and density of the peptides in case of mastitis milk as compared to normal milk sample, particularly in the most cationic zone with highest electrophoretic mobility or lower molecular weight region. These low molecular peptides were also separated out using 10 kDa cut-off membrane ultra filtration, which was subsequently examined for in vitro antibacterial sensitivity and subjected to SDS-PAGE and low molecular weight zone was further subjected to MALDI-TOF mass spectrometry, which identified the most anodic two peptides of about 5 kDa as β-defensin viz. The LAP (lingual antibiotic peptide) and BNBD-2 (bovine neutrophil beta-defensin-2) based on amino acid sequences unlike that of healthy buffalo milk. Sequence homology studies also supported mass spectrometry data as both the peptides shared 100 and 98.5% identities with cattle β-defensins, respectively. Antibacterial assay against S. aureus and E. coli revealed significant activity of these peptides against both gram-positive and gram-negative organisms at 10 μg concentration. It is concluded that expression of β-defensin peptides in ductal epithelium were induced in mastitis and these defensin peptides were also released into the milk.
  V. Gupta , S.K. Shukla , S.M. Shrivastava , S. Shukla , K. Kumar , D.P. Saxena , B. Shrivastava and M. Chaudhary
  The aim of this research was to study the influence of formulation parameters in the preparation of sustained release aceclofenac loaded PLGA microspheres by emulsion solvent diffusion technique. The methods used in this components and their concentration necessary for organogels formation were evaluated using phase diagram Solubility of aceclofenac was determined, Characterization of Poly (DL-lactide)-co-glycolide (PLGA) polymer, solubility assessment of aceclofenac, drug-excipients compatibility studies, in vitro analytical method development , preparation of aceclofenac-loaded PLGA microspheres, characterization of the formulations. Prepared microspheres were optimized and evaluated for different parameters and best formulation was subjected to in vitro drug release studies. The prepared microspheres were white, free-flowing and almost spherical in shape. In vitro drug release studies were carried out up to 24 h in three different pH media, i.e., 0.1 N HCl (pH 1.2), phosphate buffer (pH 6.8) and phosphate buffer (pH 7.4). The drug-polymer concentration of dispersed phase influences the particle size and drug release properties. In nut shell it may be concluded that sustained release aceclofenac microspheres can be successfully prepared and used parenterally with increased therapeutic value and reduced side effects.
  S.K. Singh , S. Mehra , S.K. Shukla , Vinay Kumar , A. Tiwari , M. Mehra , Giriraj Goyal , Jose Mathew and Deepak Sharma
  The MHC class I gene was amplified, cloned and sequenced in guinea fowl using the primers specific to BF2 gene in chicken. The nucleotide sequence of 571 bp partial CDS of BF2 gene includes 32 nucleotides of signal peptide (exon 1), complete α1 domain (270 nucleotides) and 269 nucleotides of α2 domain. For α1 and α domain no sequence variation was observed within guinea fowl sequences, however, high variability was observed within the other poultry species (15.93-28.03%) except chicken (7.95-9.16%). Between the guinea fowl and other poultry species, the α1 domain showed high nucleotide variability (29.26-43.70%). Among poultry species, guinea fowl showed least variability with chicken and maximum with duck. Among the substitutions, majorities were of non-synonymous (76.27%) with a ration of 1:3 between synonymous to non-synonymous substitutions. Guinea fowl showed lower genetic distances (Kimura 2-parameter) with chicken and quail (0.211-0.215), while with duck and goose, it showed higher genetic distances (0.343-0.350). Phylogenetic tree, based these genetic distances revealed two major clusters, comprising of guinea fowl, quail and chicken in one with guinea fowl as separate branch, while duck and goose in other.
  G. Goyal , V. Upmanyu , S.K. Singh , S.K. Shukla , S. Mehra , Vinay Kumar and Deepak Sharma
  Differential expression of IL-6 and IGF-II genes were studied in guinea fowl and broiler chicken using semi-quantitative analysis. A 219 bp fragment of IL-6 and 215 bp fragment of IGF-II were amplified in guinea fowl and broiler chicken using chicken specific primers. Semi-quantitative analysis revealed the adjusted Integral Density of 0.853 and 0.051 for IL-6 band in guinea fowl and broiler chicken respectively, revealing 16.62 fold higher IL-6 mRNA expression in LPS induced PBMCs from guinea fowl as compared to that from broiler. However, adjusted Integral Density of IGF-II band was 0.082 and 1.106 for IGF-II band in guinea fowl and broiler chicken respectively, which revealed 13.43 fold increase in IGF-II mRNA expression in LPS induced PBMCs in broiler chicken as compared to that in guinea fowl. Hence, guinea fowl showed higher expression of pro-inflammatory cytokine (IL-6) and lower expression of IGF-II in comparison to broiler chicken. These findings were as per expectation in view of much higher immuno-competence and lower growth rate in guinea fowl in comparison to chicken.
  D.P. Saxena , S.K. Shukla , K. Kumar , R. Saxena , S. Saxena , S. Shukla , V. Gupta , R. Stephen , H. Kumar and L. Kumar
  The aim of this study was to test the in vitro antiplasmodial effect of extract and different fractions of Diospyros melanoxylan. Diospyros melanoxylon (Barks) are collected from the lower forest of Uttaranchal, which is identified by the local people. Plant materials are known as source of new antimicrobial agents, as a result search has been to discover new antibacterial drugs of plant origin. Six of eight methanolic extracts were found to have significant activity, in vitro anti-plasmodial effect of the water and ethanol extract of IC50 value is ranging from (IC50 = 116±9.19 and IC50 145±140 μg mL-1) and (IC50 = 35±0.0 and IC50 47±4.24 μg mL-1) of D. melanoxylon against chloroquine resistant and susceptible variety of Plasmodium falciparum. Least phytochemicals was observed in case of petroleum ether. These results, so obtained demonstrate the broad spectrum activity of D. melanoxylon bark extracts which may be useful in treatment of various microbial infections. Extracts of three of the four species of Indian Diospyros tested in this study showed antiplasmodial activities, with the best activity shown by D. melanoxylon. This species especially is worthy of further investigation to determine which of its constituents are responsible for the activity.
 
 
 
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