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Articles by S. Ghosh
Total Records ( 7 ) for S. Ghosh
  Biswajit Roy , B. Brahma , S. Ghosh , P.K. Pankaj and G. Mandal
  Protein is an expensive ingredient of dairy cattle feeds. Overfeeding of protein contributes to environmental pollution and higher feed costs. Although, high dietary protein stimulates milk production, increased protein has been found to be detrimental to reproductive performance of the animal. Efficiency of protein feeding is a function of nitrogen supply to the rumen as well the cow. Consequently, a system to monitor protein feeding must account for rumen as well as post ruminal supply and efficiency. Milk Urea Nitrogen (MUN) has potential to be utilized as a non-invasive input to a system to monitor the crude protein status in a dairy herd on a regular basis. The MUN in a dairy herd provides an opportunity to formulate the dietary protein constituency that optimizes nitrogen utilization for milk production and avoids possible negative effects on herd fertility. Milk urea varied by season, month, parity group, stage of lactation and sample type. Researchers should consider controlling for these variables as potential confounders when exploring the relationship between MU and nutritional management or measures of performance such as production or reproduction.
  K. N. Kimani , R. Potluri , A. Natalwala , S. Ghosh , R. Heun and P. Narendran
  not available
  J Dong , E Jimi , C Zeiss , M. S Hayden and S. Ghosh

NF-B is well established as a key component of the inflammatory response. However, the precise mechanisms through which NF-B activation contributes to inflammatory disease states remain poorly defined. To test the role of NF-B in inflammation, we created a knock-in mouse that expresses a constitutively active form of NF-B p65 dimers. These mice are born at normal Mendelian ratios, but display a progressive, systemic hyperinflammatory condition that results in severe runting and, typically, death 8–20 d after birth. Examination of homozygous knock-in mice demonstrates significant increases in proinflammatory cytokines and chemokines. Remarkably, crossing this strain with mice lacking TNF receptor 1 (TNFR1) leads to a complete rescue of the hyperinflammatory phenotype. However, upon aging, these rescued mice begin to display chronic keratitis accompanied by increased corneal expression of TNF, IL-1β, and MMP-9, similar to that seen in human keratoconjunctivitis sicca (KCS) or "dry eyes." Therefore, our results show that, while constitutively active NF-B can trigger systemic inflammation, it does so indirectly, through increased TNF production. However, certain inflammatory disease states, such as keratitis or KCS, a condition that is seen in Sjogren's syndrome, are dependent on NF-B, but are independent of TNFR1 signaling.

  S. Ghosh and M.K.I. Khan
  The study was conducted to identify a suitable milk-recording protocol for small-scale dairy production. Data from Holstein-FriesianxLocal and SahiwalxLocal crossbred cows on 2 selected farms in Chittagong metropolitan area of Bangladesh form 2010 to 2011 was used to compare and evaluate the co-efficients of 3 different mathematical models of lactation curve for daily and test-day milk yield. The estimated model co-efficients and the 210 days predicted lactation milk yields varied significantly between crossbreds. The models were evaluated with 3 fit statistic values (Coefficient of Determination (R2), Root Mean Square Error (RMSE) and Coefficient of Variation (COV)). The highest lactation milk yield was found for FriesianxLocal on Farm 1. The average daily milk yield of FriesianxLocal was higher than Sahiwal crossbreds in both the farms. The Wood model was found to be suitable to transform test-day milk yield into a 210-days predicted milk yield for all crossbreds based on higher R2 and COV and lower RMSE values. The test-day milk yield of 1 and 2 weeks interval was found to be best fitted with the actual 210-days milk yield by using Wood model for both crossbreds.
  N.A. Khan , S. Ghosh and S.P. Ghosal
  This study presents a new and efficient approach for capacitor placement in radial distribution systems with an objective of improving the voltage profile and reduction of power loss. In this study, optimal distributed generation allocation for loss reduction in distribution network. The main purpose of this study is to discuss the basic understanding of power quality in relation to the distributed generation. A Canonical Complementary Particle Swarm Optimization Algorithm (CCPSOA) was used as solving tool. This algorithm is used to minimize an objective function. For applying CCPSOA, software is programmed under Matlab software is prepared. This proposed CPSO method is implemented on IEEE 30 and IEEE 69-bus systems and the results may show that the proposed method is better than the other methods. The results prove the efficiency of the proposed method.
  S. Ghosh , P. Nayek , S. Kr. Roy , Tapas Pal Majumder and R. Dabrowski
  In this paper we report the results from detailed electro-optical and dielectric studies in various antiferroelectric and ferroelectric phases of an orthoconic antiferroelectric liquid crystal (OAFLC) material . The material possesses high tilt and high spontaneous polarisation. Such an OAFLC, because of its high tilt, provides an excellent dark state. The material exhibits V-shaped switching in the SmC* phase. Dielectric studies reveal the existence of another phase during heating in the range between 78.6 and 92°C which did not appear in the DSC curve and in polarising microscopy. This phase has been identified as the SmCγ* phase and is extremely sensitive with respect to the cell conditions, aligning material, purity, etc. Three dielectric modes have been assigned in the above-mentioned temperature range and their origins are discussed.
  S. GHOSH , Zhen-Yu WANG , S. KANG , P.C. BHOWMIK and B.S. XING
  Sorption of humic acid (HA) on mineral surfaces has a profound interest regarding the fate of hydrophobic organic contaminants (HOCs) and carbon sequestration in soils. The objective of our study is to determine the fractionation behavior of HA upon sorption on mineral surfaces with varying surface properties. HA was coated sequentially on kaolinite (1:1 clay), montmorillonite (2:1 clay), and goethite (iron oxide) for four times. The unadsorbed HA fractions were characterized by elemental analysis, diffuse reflectance infrared Fourier transform spectroscopy (DRIFT), and solid state 13C nuclear magnetic resonance spectroscopy (NMR). The mineral-HA complexes were characterized by DRIFT. Polarity index [(N+O)/C] revealed higher polarity of the unadsorbed HA fractions after coating on kaolinite, reflecting that relatively higher polarity fractions of HA remain unadsorbed. Sorption of aliphatic alcohol fraction along with carbohydrate was prominent on kaolinite surface. DRIFT results of the unadsorbed HA fractions indicated more sorption of aliphatic moieties on both kaolinite and montmorillonite. DRIFT results of the unadsorbed HA fractions after sorption on kaolinite and goethite showed the sorption of the proteinaceous fractions of HA. The HA fractions obtained after coating on goethite showed significant sorption of carboxylic moieties. The results mentioned above comply reasonably well with the DRIFT spectra of the mineral-HA complexes. 13C NMR results showed higher sorption of anomeric C on kaolinite surface. Higher sorption of paraffinic fraction was observed on montmorillonite. NMR data inferred the sorption of carboxylic moieties on goethite surface. Overall, this study showed that aliphatic moieties of HA preferentially sorbed on kaolinite and montmorillonite, while carboxylic functional groups play a significant role in sorption of HA on goethite. The sorbed fractions of HA may modify the mineral surface properties, and thus, the interaction with organic contaminants.
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