Browsing by Author "S.K. Saha"

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B-site disorder driven multiple-magnetic phases: Griffiths phase, re-entrant cluster glass, and exchange bias in Pr2CoFeO6
(American Institute of Physics Inc., 2019) Arkadeb Pal; Prajyoti Singh; V.K. Gangwar; Surajit Ghosh; P. Prakash; S.K. Saha; Amitabh Das; Manoranjan Kumar; A.K. Ghosh; Sandip Chatterjee
The magnetic spin ordering and the magnetization dynamics of a double perovskite Pr2CoFeO6 have been investigated by employing the (dc and ac) magnetization and neutron powder diffraction techniques. The study revealed that Pr2CoFeO6 adopted a B-site disordered orthorhombic structure (Pnma). Furthermore, ab initio band structure calculations suggested an insulating antiferromagnetic ground state. Magnetization measurements revealed that the system possesses a spectrum of competing magnetic phases, viz., long range canted antiferromagnetic (AFM) spin ordering (TN ∼269 K), Griffiths-like phase, re-entrant cluster glass (TG ∼34 K), and exchange bias effects. The neutron diffraction study divulged the exhibition of a long range G-type of canted AFM spin ordering. The random nonmagnetic dilution of magnetic Fe3+ (high spin) ions by Co3+ (low spin) ions due to B-site disorder essentially played a crucial role in manifesting such magnetic properties of the system. © 2019 Author(s).
Better preservation of Campylobacter jejuni/C. coli in a defined medium
(1991) S.K. Saha; S.C. Sanyal
[No abstract available]
Enterotoxigenicity of chicken isolates of Campylobacter jejuni in ligated ileal loops of rats
(1988) S.K. Saha; N.P. Singh; S.C. Sanyal
Ligated ileal loops in rats of the Charles-Foster strain, weighing 200-250 g and aged 7-8 months, provided a sensitive and reproducible means of testing the enterotoxigenicity of Campylobacter jejuni. All of 16 chicken isolates caused fluid accumulation comparable to that produced by toxigenic Vibrio cholerae O1, strain 569B. However, 11 of the isolates required one to three consecutive passages through the rat gut before doing so. The amount of fluid produced increased after each passage. Of three culture media tested, brucella broth of pH 6.7 supported the highest degree of enterotoxigenesis. Filtrates of cultures of all 16 chicken isolates in this medium were as effective as viable C. jejuni in producing fluid in ileal loops. The enterotoxin was neutralised completely by cholera antitoxin diluted 1 in 160, indicating its close immunobiological relationship to cholera toxin.
Exploring Sugarcane Press Mud as an Economical Feed Ingredient for Growing Cattle
(Springer, 2024) C.D. Malapure; S.K. Saha; Dinesh Kumar; M.S. Mahesh; Ranjan Kumar
The abundantly available sugarcane press mud (SPM) has not been fully explored for its application in animal nutrition, despite possessing an acceptable nutrient profile. The present study examines the impact of incorporating SPM on the performance variables of growing cattle and its economic feasibility. Eighteen Vrindavani calves, aged 5 to 6 months and of similar body weight (BW: 33 ± 0.15 kg), were divided into three groups (T0, T1 and T2), with each group containing six calves. Animals in groups T0, T1 and T2 were fed with 0, 10 and 20% sun-dried SPM in their concentrate mixture, respectively, which proportionally substituted wheat bran on a weight-to-weight basis. Wheat straw was offered ad libitum as a source of forage in all the groups. The experimental feeding lasted for 180 days including six days of metabolism trial. The results indicated that the dry matter and nutrient intake, their digestibilities, as well as nutritional value of composite rations fed to 3 groups did not differ significantly (P>0.05). Furthermore, there were no differences in average daily gain in BW, feed conversion ratio, or nitrogen and phosphorus metabolism among the groups. Similarly, rumen microbial fermentation was not influenced by any of the dietary treatments. However, the intake of calcium and its retention were found higher (P<0.05) in groups T1 and T2 as compared to T0. Beneficially, the cost of concentrate mixture and total feed cost were significantly lower (P<0.05) in both the T1 and T2 groups as compared to T0. Based on these findings, we conclude that SPM can be safely incorporated into the diet of growing cattle at levels up to 20% without negatively affecting their performance parameters. These findings encourage the use of SPM as a low-cost alternative to partially substitute the conventional ingredient like wheat bran, thereby economising feeding programmes for growing cattle operations. © The Author(s), under exclusive licence to Society for Sugar Research & Promotion 2024.
Haemato-Biochemical and Immune Responses to Dietary Sugarcane Press Mud in Calves
(Springer, 2024) C.D. Malapure; Dinesh Kumar; M.S. Mahesh; B. S. Bharath Kumar; S.K. Saha
Eighteen Vrindavani male calves aged 5–6 months with a mean body weight of 33 ± 0.15 kg were divided into three treatments of six each as: T0 (control) fed with concentrate feed mixture (CFM) without inclusion of sugarcane press mud (SPM); T1 fed with CFM containing 10% SPM and T2 had 20% SPM substituting wheat bran on a physical (w/w) basis. All the three isonitrogenous CFM were prepared in mash form and offered to animals along with wheat straw in a proportion of 60:40 for 180 days. Blood samples were drawn to estimate biochemical and immune responses of experimental calves. Haematological indices like haemoglobin and packed cell volume did not vary (P > 0.05) among the three groups. Similarly, blood metabolites like glucose, total protein, albumin, globulin, albumin: globulin ratio, total cholesterol, urea and creatinine were not different due to dietary treatments. Furthermore, no effect was detected on serum enzymes such as alanine aminotransferase, aspartate aminotransferase and alkaline phosphatase. In addition, serum minerals like calcium, phosphorus, zinc, copper and iron remained unchanged across three groups. Also, the data on immune competence revealed that the effect of treatment was non-significant (P > 0.05) for both humoral- and cell-mediated immune responses among three groups of calves. Based on these findings, it is concluded that dietary utilisation of SPM up to 20% of CFM equivalent to 12% of the total diet of calves has no adverse effects on blood biochemistry and immunity. © The Author(s), under exclusive licence to The National Academy of Sciences, India 2024.