1
|
Bhattacharyya K, Kumar A, Tyagi D, Tripathi AK, Tyagi AK. Role of Constituent Oxides for Thermal Mineralization of o-Dichloro Benzene over Mixed-Oxide-TiO 2 Catalysts: A Mechanistic Explanation. Chemphyschem 2024:e202300472. [PMID: 38487944 DOI: 10.1002/cphc.202300472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Revised: 03/14/2024] [Indexed: 04/23/2024]
Abstract
Catalysts with V2O5, WO3 and V2O5-WO3 dispersed over TiO2 were synthesized using sol-gel technique and thoroughly characterized by various techniques. The catalysts were evaluated for degradation of ortho-dichloro benzene (o-DCB) in air/helium, a representative probe molecule for polychlorinated dibenzo-para-dioxin and polychlorinated dibenzofuran by employing in situ Fourier-transform infrared spectroscopy (FT-IR spectroscopy). Different intermediate species formed on the surface of the TiO2 supported catalysts through of interaction of sorbate molecules with the lattice and/or gaseous oxygen were investigated in detail. Analysis of vibrational bands, observed during sorption of o-DCB and o-DCB-air mixture as a function of temperature over these catalysts, delineated the role of surface intermediate species such as phenolate, enolates, maleates, carboxylates, carbonates in mineralization of o-DCB. Nature and stability of intermediate species, found to be different over these catalysts, were able to elucidate the catalytic activity trend.
Collapse
Affiliation(s)
- Kaustava Bhattacharyya
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India
- Homi Bhabha National Institute, Mumbai, 400 094, India
| | - Adarsh Kumar
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India
- Homi Bhabha National Institute, Mumbai, 400 094, India
| | - Deepak Tyagi
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India
| | - A K Tripathi
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India
- Homi Bhabha National Institute, Mumbai, 400 094, India
| | - A K Tyagi
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India
- Homi Bhabha National Institute, Mumbai, 400 094, India
| |
Collapse
|
2
|
Kakkar S, Kodeeswaran M, Priyadharshan KP, Narindar A, Tyagi AK, Goswami MK, Scalia G, Umana GE, Chaurasia B. Management of migrating spinal schwannomas: a surgeon's dilemma. Illustrative case. J Neurosurg Case Lessons 2024; 7:CASE23689. [PMID: 38163341 PMCID: PMC10763633 DOI: 10.3171/case23689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Accepted: 12/04/2023] [Indexed: 01/03/2024]
Abstract
BACKGROUND A migrating spinal tumor is a rare phenomenon in the medical literature. Efficient management of these tumors is critical to avoid extended laminectomies. OBSERVATIONS In this article, the authors present the case of a patient with a migrating lumbar schwannoma. They summarize a literature review of similar cases, highlighting the intraoperative challenges faced, and provide management guidelines for similar cases from their experience. LESSONS Surgeons dealing with spinal intradural extramedullary lesions should always consider the possibility of tumor migration. Routine preoperative counseling regarding potential tumor migration and its efficient management is essential, as it reduces the risk of unplanned extensive laminectomy or durotomy, minimizing morbidity and medicolegal concerns and enhancing patient care.
Collapse
Affiliation(s)
- Sejal Kakkar
- Department of Neurosurgery, Govt Kilpauk Medical College, Chennai, Tamilnadu, India
| | - M. Kodeeswaran
- Department of Neurosurgery, Govt Kilpauk Medical College, Chennai, Tamilnadu, India
| | - K. P. Priyadharshan
- Department of Neurosurgery, Govt Kilpauk Medical College, Chennai, Tamilnadu, India
| | - Arun Narindar
- Department of Neurosurgery, Govt Kilpauk Medical College, Chennai, Tamilnadu, India
| | - Arvind Kumar Tyagi
- Department of Neurosurgery, Govt Kilpauk Medical College, Chennai, Tamilnadu, India
| | - Mayukh Kamal Goswami
- Department of Neurosurgery, Govt Kilpauk Medical College, Chennai, Tamilnadu, India
| | - Gianluca Scalia
- Neurosurgery Unit, “Highly Specialized Hospital and of National Importance” Garibaldi, Catania, Italy
| | - Giuseppe Emmanuele Umana
- Department of Neurosurgery, Trauma Center, Gamma Knife Centre Cannizaro Hospital, Cannizaro, Italy; and
| | - Bipin Chaurasia
- Department of Neurosurgery, Neurosurgery Clinic, Birgunj, Nepal
| |
Collapse
|
3
|
Dixit S, Kumar S, Sharma R, Banakar PS, Singh M, Keshri A, Tyagi AK. Rumen multi-omics addressing diet-host-microbiome interplay in farm animals: a review. Anim Biotechnol 2023; 34:3187-3205. [PMID: 35713100 DOI: 10.1080/10495398.2022.2078979] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
Continuous improvement in the living standards of developing countries, calls for an urgent need of high quality meat and dairy products. The farm animals have a micro-ecosystem in gastro-intestinal tract, comprising of a wide variety of flora and fauna which converts roughages and agricultural byproducts as well as nutrient rich concentrate sources into the useful products such as volatile fatty acids and microbial crude proteins. The microbial diversity changes according to composition of the feed, host species/breed and host's individual genetic makeup. From culture methods to next-generation sequencing technologies, the knowledge has emerged a lot to know-how of microbial world viz. their identification, enzymatic activities and metabolites which are the keys of ruminant's successful existence. The structural composition of ruminal community revealed through metagenomics can be elaborated by metatranscriptomics and metabolomics through deciphering their functional role in metabolism and their responses to the external and internal stimuli. These highly sophisticated analytical tools have made possible to correlate the differences in the feed efficiency, nutrients utilization and methane emissions to their rumen microbiome. The comprehensively understood rumen microbiome will enhance the knowledge in the fields of animal nutrition, biotechnology and climatology through deciphering the significance of each and every domain of residing microbial entity. The present review undertakes the recent investigations regarding rumen multi-omics viz. taxonomic and functional potential of microbial populations, host-diet-microbiome interactions and correlation with metabolic dynamics.
Collapse
Affiliation(s)
- Sonam Dixit
- Rumen Biotechnology Laboratory, Department of Animal Nutrition, National Dairy Research Institute, Karnal, India
| | - Sachin Kumar
- Rumen Biotechnology Laboratory, Department of Animal Nutrition, National Dairy Research Institute, Karnal, India
| | - Ritu Sharma
- Rumen Biotechnology Laboratory, Department of Animal Nutrition, National Dairy Research Institute, Karnal, India
| | - P S Banakar
- Rumen Biotechnology Laboratory, Department of Animal Nutrition, National Dairy Research Institute, Karnal, India
| | - Manvendra Singh
- Krishi Vigyan Kendra, Banda University of Agriculture and Technology, Banda, India
| | - Anchal Keshri
- Rumen Biotechnology Laboratory, Department of Animal Nutrition, National Dairy Research Institute, Karnal, India
| | - A K Tyagi
- Rumen Biotechnology Laboratory, Department of Animal Nutrition, National Dairy Research Institute, Karnal, India
- Animal Nutrition and Physiology, Indian Council of Agricultural Research, New Delhi, India
| |
Collapse
|
4
|
Guleria A, Aishwarya J, Kunwar A, Neogy S, Debnath AK, Rath MC, Adhikari S, Tyagi AK. Solvated electron-induced synthesis of cyclodextrin-coated Pd nanoparticles: mechanistic, catalytic, and anticancer studies. Dalton Trans 2023; 52:1036-1051. [PMID: 36602081 DOI: 10.1039/d2dt03219h] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Herein, using in situ generated solvated electrons in the reaction media, a highly time-efficient, one-pot green approach has been employed to synthesize palladium (Pd) nanoparticles (NPs) coated with a molecular assembly of α-cyclodextrin (α-CD). The appearance of a shoulder peak at 280 nm in the UV-Vis absorption spectra indicated the formation of Pd NPs, which was further confirmed from their cubic phase XRD pattern. The nanomorphology varied considerably as a function of the dose rate, wherein sphere-shaped NPs (average size ∼ 7.6 nm) were formed in the case of high dose rate electron-beam assisted synthesis, while nanoflakes self-assembled to form nanoflower-shaped morphologies in a γ-ray mediated approach involving a low dose rate. The formation kinetics of NPs was investigated by pulse radiolysis which revealed the formation of Pd-based transients by the solvated electron-induced reaction. Importantly, no interference of α-CD was observed in the kinetics of the transient species, rather it played the role of a morphology directing agent in addition to a biocompatible stabilizing agent. The catalytic studies revealed that the morphology of the NPs has a significant effect on the reduction efficiency of 4-nitrophenol to 4-aminophenol. Another important highlight of this work is the demonstration of the morphology-dependent anticancer efficacy of Pd NPs against lung and brain cancer cells. Notably, flower-shaped Pd NPs exhibited significantly higher cancer cell killing as compared to spherical NPs, while being less toxic towards normal lung fibroblasts. Nonetheless, these findings show the promising potential of Pd NPs in anticancer treatment.
Collapse
Affiliation(s)
- A Guleria
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India. .,Homi Bhabha National Institute, Mumbai 400094, Trombay, India
| | - J Aishwarya
- ACTREC (TMC), Kharghar, Navi Mumbai, India.,Homi Bhabha National Institute, Mumbai 400094, Trombay, India
| | - A Kunwar
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India. .,Homi Bhabha National Institute, Mumbai 400094, Trombay, India
| | - S Neogy
- Materials Science Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - A K Debnath
- Technical Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - M C Rath
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India. .,Homi Bhabha National Institute, Mumbai 400094, Trombay, India
| | - S Adhikari
- Scientific Information Resource Division, Bhabha Atomic Research Centre, Mumbai 400085, India.,Homi Bhabha National Institute, Mumbai 400094, Trombay, India
| | - A K Tyagi
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India. .,Homi Bhabha National Institute, Mumbai 400094, Trombay, India
| |
Collapse
|
5
|
Singh M, Kumar S, Banakar PS, Vinay VV, Das A, Tyagi N, Tyagi AK. Synbiotic formulation of Cichorium intybus root powder with Lactobacillus acidophilus NCDC15 and Lactobacillus reuteri BFE7 improves growth performance in Murrah buffalo calves via altering selective gut health indices. Trop Anim Health Prod 2021; 53:291. [PMID: 33909188 DOI: 10.1007/s11250-021-02733-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2020] [Accepted: 04/18/2021] [Indexed: 12/28/2022]
Abstract
The objective of this study was to evaluate the effects of synbiotic formulation of Cichorium intybus root powder (C) with Lactobacillus acidophilus NCDC15 (LA) and Lactobacillus reuteri BFE7 (LR) on growth performance in Murrah buffalo calves via monitoring selective gut health indices. Twenty-four Murrah buffalo calves of 5-7 days old and 33 ± 2.0 kg of body weight were distributed randomly into three groups adopting complete randomized design (CRD) as follows: (1) group I served as control (CON) provided with a basal diet alone; (2) group II supplemented with synbiotic formulation of 200 mL L. acidophilus NCDC15 fermented milk with 8 g of Cichorium intybus root powder (LAC) along with basal diet; (3) group III supplemented with synbiotic formulation of 200 mL L. reuteri BFE7 fermented milk with 8 g of Cichorium intybus root powder (LRC) along with basal diet. The final body weight (BW), average dry matter intake (DMI) and structural body measurements were significantly increased (P < 0.05) in LAC and LRC groups by synbiotic as compared to the CON. No effect was registered on apparent nutrient digestibility coefficient of various nutrients in supplemented groups. Faecal score was reduced by the supplementation of synbiotic being lowest in LRC followed by LAC and CON. Calves supplemented synbiotic showed lower (P < 0.05) faecal pH and ammonia with a concomitant increase in faecal lactate levels and faecal short chain fatty acids (SCFA) as compared to control. The faecal Lactobacillus and Bifidobacterium population was increased (P < 0.05) in synbiotic fed groups as compared to control. Additionally, coliform and clostridia count was decreased (P < 0.05) in treatment groups compared to CON. Overall, it may be concluded that synbiotic supplementation was effective in improving the growth performance in Murrah buffalo calves via altering selective gut health indices.
Collapse
Affiliation(s)
- Manpreet Singh
- Animal Nutrition Division, ICAR-National Dairy Research Institute, Karnal, Haryana, 132001, India
| | - Sachin Kumar
- Animal Nutrition Division, ICAR-National Dairy Research Institute, Karnal, Haryana, 132001, India.
| | - P S Banakar
- Animal Nutrition Division, ICAR-National Dairy Research Institute, Karnal, Haryana, 132001, India
| | - V V Vinay
- Animal Nutrition Division, ICAR-National Dairy Research Institute, Karnal, Haryana, 132001, India
| | - Asit Das
- Animal Nutrition Division, ICAR-National Dairy Research Institute, Karnal, Haryana, 132001, India
| | - Nitin Tyagi
- Animal Nutrition Division, ICAR-National Dairy Research Institute, Karnal, Haryana, 132001, India
| | - A K Tyagi
- Animal Nutrition Division, ICAR-National Dairy Research Institute, Karnal, Haryana, 132001, India
- Animal Nutrition and Physiology, Indian Council of Agricultural Research, New Delhi, India
| |
Collapse
|
6
|
Tyagi A, Nigam S, Sudarsan V, Majumder C, Vatsa RK, Tyagi AK. Why Do Relative Intensities of Charge Transfer and Intra-4f Transitions of Eu 3+ Ion Invert in Yttrium Germanate Hosts? Unravelling the Underlying Intricacies from Experimental and Theoretical Investigations. Inorg Chem 2020; 59:12659-12671. [PMID: 32845617 DOI: 10.1021/acs.inorgchem.0c01757] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The dominant intensity of parity-forbidden intra-4f transitions of europium(III) over O → Eu charge-transfer band (CTB) intensity is against common perceptions, yet this trend is observed in many germanate hosts and has not been rationalized so far. In search of a plausible explanation for this unusual trend, present work reports an experimental and theoretical investigations in conjunction on two sibling germanate host, namely, Y2GeO5 and Y2Ge2O7 having dopant Eu3+ in their respective YO7 polyhedra. Whereas for Y2GeO5:Eu3+, the CTB is more intense than the intra-4f transitions in the excitation spectrum, in the case of Y2Ge2O7:Eu3+, the relative intensities of CTB and intra-4f transitions are reversed. Comparative structural analysis reveals that Eu3+ present in YO7 of Y2GeO5 has a greater number of tetra-coordinated oxygen (Otetra) and yttrium atom as first and second neighbors, respectively (Eu3+-Otetra-Y3+ linkages). Conversely, in Y2Ge2O7 host, the Eu3+ ion mostly has tricoordinated oxygen (Otri) as its nearest neighbor and germanium ions next to Otri (Eu3+-Otri-Ge4+ linkage). Theoretical calculations reveal that while Y2GeO5:Eu has Otetra(4Y) dominating at the Fermi level and the 4f state of Eu3+ remains inert toward mixing, in Y2Ge2O7:Eu, the Fermi level has major contribution from Otri(2Y + 1Ge) with significant mixing with 4f states of Eu. The dominant control of Eu3+-Otri-Ge4+ linkages in geometrical and electronic structure of Y2Ge2O7:Eu owing to the GeO4 surrounding has been attributed to relative poor intensity of O → Eu CTB. Siege of Eu3+ by GeO4 and subsequent occurrence of Eu3+-Otri-Ge4+ linkages play a dual role: First, it induces electronic rigidity to hinder excitation of electron at bridging (Otri) oxygen by highly charged small Ge4+ cation; second, the covalent character in Eu-O bond is achieved by intermixing of Eu's 4f and Otri 2p orbital which facilitates relaxing of the parity-selection rule thus enhancing the probability of intra-4f transitions. The inferences drawn remain valid when extrapolated to other inorganic oxides having EuOx polyhedra surrounded by covalent units like PO4, SiO4, etc. and have a prevailing number of low-coordinated oxygen atoms and highly charged small cation in the first and second coordination shells, respectively. The optical basicity concept is also found to endorse our explanation. These remarkable generic inferences will pave the rational way for designing efficient phosphors for solid-state lighting.
Collapse
Affiliation(s)
- Adish Tyagi
- Chemistry Division, Bhabha Atomic Research Center, Mumbai 400 085 India.,Homi Bhabha National Institute (HBNI), Mumbai 400 094, India
| | - Sandeep Nigam
- Chemistry Division, Bhabha Atomic Research Center, Mumbai 400 085 India.,Homi Bhabha National Institute (HBNI), Mumbai 400 094, India
| | - V Sudarsan
- Chemistry Division, Bhabha Atomic Research Center, Mumbai 400 085 India.,Homi Bhabha National Institute (HBNI), Mumbai 400 094, India
| | - C Majumder
- Chemistry Division, Bhabha Atomic Research Center, Mumbai 400 085 India.,Homi Bhabha National Institute (HBNI), Mumbai 400 094, India
| | - R K Vatsa
- Chemistry Division, Bhabha Atomic Research Center, Mumbai 400 085 India.,Homi Bhabha National Institute (HBNI), Mumbai 400 094, India
| | - A K Tyagi
- Chemistry Division, Bhabha Atomic Research Center, Mumbai 400 085 India.,Homi Bhabha National Institute (HBNI), Mumbai 400 094, India
| |
Collapse
|
7
|
Sharma A, Datt C, Gupta R, Kumar J, . S, Tyagi AK, Mani V. Effect of supplementation of Kappaphycus alvarezii based seaweed product on rumen fermentation
parameters under in vitro conditions. IJDS 2019. [DOI: 10.33785/ijds.2019.v72i05.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
8
|
Purkayastha A, Sharma N, Tyagi AK, Vartak A, Solanki P. Transitional Cell Carcinoma of Lacrimal Sac Presenting as a Massive Swelling and Dacryohemorrhea. Indian J Med Paediatr Oncol 2019. [DOI: 10.4103/ijmpo.ijmpo_154_17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
AbstractTransitional cell carcinomas (TCCs) of lacrimal sac are extremely uncommon neoplasms with high degree of invasiveness, local recurrence, and distant metastasis despite an aggressive treatment. They generally present with epiphora and lacrimal mass lesion but rarely dacryohemorrhea or bloody tears. We hereby report a 50-year-old female who presented with complaints of epiphora, blood in tears, and a progressive swelling measuring 8 cm × 5 cm over left lacrimal sac site. Biopsy from the swelling revealed TCC of lacrimal sac. Radiographic imaging showed a localized mass lesion lacrimal sac eroding adjacent structures, left orbital extension, and left cervical lymphadenopathy without any intracranial extension or distant metastasis. She underwent wide local excision of the primary lesion with left orbital exenteration, left partial maxillectomy, left anterior ethmoidectomy, and left forehead flap reconstruction followed by adjuvant conformal radiotherapy to local site to a dose of 60 Gy and ipsilateral neck to 50 Gy. Combined modality therapy showed satisfactory cosmesis and overall improved functionality on her first review at 6 weeks, however she lost to further follow-up. A thorough review of literature reveals that our case may be one of the largest TCC of lacrimal sac ever reported and the third case to present with dacryohemorrhea in world literature till date.
Collapse
Affiliation(s)
- Abhishek Purkayastha
- Department of Radiation Oncology, Army Hospital Research and Referral, New Delhi, India
| | - Neelam Sharma
- Department of Radiation Oncology, Army Hospital Research and Referral, New Delhi, India
| | - Arvind Kumar Tyagi
- Department of Surgical Oncology, Army Hospital Research and Referral, New Delhi, India
| | - Anushree Vartak
- Department of Surgical Oncology, Army Hospital Research and Referral, New Delhi, India
| | - Pramod Solanki
- Department of Pathology, Army Hospital Research and Referral, New Delhi, India
| |
Collapse
|
9
|
Kalra N, Solanki SP, Tyagi AK. P101 The leeds paediatric brain arteriovenous malformation (BAVM) outcomes. J Neurol Psychiatry 2019. [DOI: 10.1136/jnnp-2019-abn.158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
ObjectivesThe commonest cause of stroke in a paediatric population is a ruptured brain ateriovenous malformation (bAVM). We aim to assess the functional outcomes of patients who have undergone operative intervention at our unit for ruptured and non-ruptured bAVMs.DesignA single centre retrospective cohort analysis of paediatric bAVM patients.Subjects10 paediatric patients at time of surgery between January 2007 – December 2017 mean age at follow up 15.9 years, range 2–26 years, mean time to follow up 6.3 years, range 1.5–11.2 years.MethodsPatients with bAVMs were identified via the paediatric neurovascular database. They were contacted via telephone and the Paediatric Quality of Life (PedsQL) questionnaire administered via parent proxy if the patient was under 18, and by the patient if above 18. Functional outcomes were assessed using the PedsQL questionnaire score and converted in to a health-related quality of life (HRQOL) score.Results10 patients underwent resection of their bAVMS, 9 survived and 7 were contactable. The mean HRQOL score 88.9 points, range 65.2–100. Only one patient had a HRQOL score below the mean of a child with chronic disease.ConclusionsThe mean HRQOL outcome score of operated paediatric bAVM was similar to that of healthy children. Patients having bAVM surgery within our unit have had a good functional outcome. Although there are small numbers in this series, there is a low incidence of operated paediatric bAVMs. Our findings suggests that such operations should be undertaken in units with expertise.
Collapse
|
10
|
Thareja S, Manrai M, Shukla R, Kumar Sood A, Jha A, Tyagi AK, Upreti V, Gahlot GPS, Maggo S. Pancreatitis and hyperparathyroidism: Still a rare association! Med J Armed Forces India 2019; 75:444-449. [PMID: 31719740 DOI: 10.1016/j.mjafi.2018.11.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Accepted: 11/20/2018] [Indexed: 12/22/2022] Open
Abstract
Background Among the multitudinous etiologies of pancreatitis, primary hyperparathyroidism (PHPT) is rarely associated with pancreatitis. However, the cause and effect relationship between the two still evokes controversy. We aimed to study and characterize the nature of pancreatic disease in PHPT. Methods A retrospective single-center study was carried out in North India over a period of 1 year (June 2015 to May 2016). All patients with pancreatitis were included. In patients with high calcium levels, Intact Parathyroid Hormone (iPTH) by Radioimmunoassay (RIA) and an Technetium 99m Sestamibi scintigraphy (MIBI-Tc-99m) scan were performed. Results During the study period, 70 patients with pancreatitis were admitted to our hospital (53 with acute pancreatitis [AP] and 17 with chronic pancreatitis [CP]). Of them, 5 patients (9.4%) were detected to have PHPT. The mean age of patients was 30.4 years (20-49 years) with 3 males and 2 females, including 1 pregnant female (29th week of gestation). Contrast enhanced computed tomography (CECT) abdomen was performed in 4 cases (excluding 1 pregnant patient) with mean Computed tomography severity index (CTSI) of 4.7 (2-8). Four patients were detected to have increased uptake in one of the parathyroid glands, and the fifth patient had an ectopic parathyroid uptake in the mediastinum. All the resected samples were identified as parathyroid adenoma on histology. The patients were followed up for 1 year with no reported recurrence of symptoms. Conclusion The data suggest an association between pancreatitis (both acute and chronic) and hypercalcemia due to PHPT. A high calcium value during AP or CP should always draw suspicion and warrants corresponding investigations in search of endocrine or malignant cause.
Collapse
Affiliation(s)
- Sandeep Thareja
- Consultant (Medicine) & Gastroenterologist, Base Hospital, Delhi Cantt, India
| | - Manish Manrai
- Associate Professor, Department of Internal Medicine, Armed Forces Medical College, Pune 411040, India
| | - Rajat Shukla
- Senior Advisor (Medicine & Gastroenterology), Command Hospital (Western Command), Chandigarh, India
| | | | - Atul Jha
- Classified Specialist (Medicine) & Gastroenterologist, Army Hospital (R&R), New Delhi, India
| | - A K Tyagi
- Professor & Head, Department of Surgery, Armed Forces Medical College, Pune 411040, India
| | - Vimal Upreti
- Senior Advisor (Medicine) & Endocrinologist, 151 Base Hospital, C/o 99 APO, India
| | - G P S Gahlot
- Classified Specialist (Pathology) & Oncopathologist, Army Hospital (R&R), New Delhi, India
| | - Sachin Maggo
- Graded Specialist (Medicine), 2009 Field Hospital, C/o 56 APO, India
| |
Collapse
|
11
|
Oberai P, Mehra P, Bhalerao R, Rai Y, Choubey G, Sahoo A, Majumder AK, Sah M, Gupta AK, Tyagi AK, Siddiqui VA, Kumar A, Manchanda R. Lycopodium clavatum for the management of urolithiasis: A randomised double blind placebo controlled trial. Indian J Res Homoeopathy 2019. [DOI: 10.4103/ijrh.ijrh_30_19] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
|
12
|
Singh SK, Talwar R, Kannan N, Tyagi AK, Jaiswal P, Kumar A. Patterns of Presentation, Treatment, and Survival Rates of Gallbladder Cancer: a Prospective Study at a Tertiary Care Centre. J Gastrointest Cancer 2018; 49:268-274. [PMID: 28367607 DOI: 10.1007/s12029-017-9940-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND India has high incidence of gallbladder carcinoma with regional variation in incidence, the highest in Northern India. This study examines the patterns of presentation, treatment strategies, and survival rate of all patients with gallbladder cancer (GBC) evaluated at our tertiary academic hospital over a period of 2 years. METHODS All patients presented to our institute with established tissue diagnosis of carcinoma gallbladder were accrued in our study over a time period of 2 years. Presentation, treatment modalities, and survival rates were analyzed. RESULTS One hundred six patients were included: 80 females and 26 males (F: M = 3:1). Median age was 60 years. Eighty patients (75%) had gallstones and 20 patients (21%) had typical history of chronic cholecystitis. The common symptom and sign at presentation were pain in the right upper abdomen (81%) and lump abdomen (49%), respectively. Overall resectability rate was 19.8% (21/106). Eighty-five patients were unresectable or metastatic and treated with palliative intent. Stagewise distribution at diagnosis was stage I (0%), stage II (4%), stage IIIA (10%), stage IIIB (8%), stage IVA (17%), and stage IVB (61%). Estimated 1-year survival for stages II, IIIA, IIIB, IVA, and IVB was 100, 76, 47.4, 26, and 10.6%, respectively. Significant difference in OS was observed among different stages of GBC (p value <0.001). CONCLUSION If proper investigations are done, radical surgery including multi-organ resection can be curative with acceptable morbidity and mortality. Stage at presentation and ability to perform curative resection are the most important prognostic factors predicting survival. Palliative chemotherapy should be considered for metastatic GBC.
Collapse
Affiliation(s)
- Santosh Kumar Singh
- Department Surgical Oncology, Army Hospital (Research & Referral), New Delhi, 110010, India.
| | - Rajnish Talwar
- Department Surgical Oncology, Army Hospital (Research & Referral), New Delhi, 110010, India
| | - Narayanan Kannan
- Department Surgical Oncology, Command Hospital (SC), Pune, 411040, India
| | - Arvind Kumar Tyagi
- Department Surgical Oncology, Army Hospital (Research & Referral), New Delhi, 110010, India
| | - Pradeep Jaiswal
- Department Surgical Oncology, Army Hospital (Research & Referral), New Delhi, 110010, India
| | - Adarsh Kumar
- Department Surgical Oncology, Army Hospital (Research & Referral), New Delhi, 110010, India
| |
Collapse
|
13
|
Deen AU, Tyagi N, Yadav RD, Kumar S, Tyagi AK, Singh SK. Feeding balanced ration can improve the productivity and economics of milk production in dairy cattle: a comprehensive field study. Trop Anim Health Prod 2018; 51:737-744. [PMID: 30449010 DOI: 10.1007/s11250-018-1747-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Accepted: 11/02/2018] [Indexed: 10/27/2022]
Affiliation(s)
- Asgar Ud Deen
- Animal Nutrition Division, National Dairy Research Institute, Karnal, Haryana, 132001, India
| | - Nitin Tyagi
- Animal Nutrition Division, National Dairy Research Institute, Karnal, Haryana, 132001, India.
| | - Ram Dav Yadav
- Animal Nutrition Division, National Dairy Research Institute, Karnal, Haryana, 132001, India
| | - Sachin Kumar
- Animal Nutrition Division, National Dairy Research Institute, Karnal, Haryana, 132001, India
| | - A K Tyagi
- Animal Nutrition Division, National Dairy Research Institute, Karnal, Haryana, 132001, India
| | - Sunil Kumar Singh
- Animal Nutrition Division, National Dairy Research Institute, Karnal, Haryana, 132001, India
| |
Collapse
|
14
|
Wilson JRF, Saeed F, Tyagi AK, Goodden JR, Sivakumar G, Crimmins D, Elliott M, Picton S, Chumas PD. Pre-operative neutrophil count and neutrophil-lymphocyte count ratio (NLCR) in predicting the histological grade of paediatric brain tumours: a preliminary study. Acta Neurochir (Wien) 2018; 160:793-800. [PMID: 29188366 PMCID: PMC5859055 DOI: 10.1007/s00701-017-3388-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Accepted: 10/31/2017] [Indexed: 12/22/2022]
Abstract
INTRODUCTION The neutrophil-lymphocyte count ratio (NLCR) is an established prognostic marker for renal, lung and colorectal carcinomas and has been suggested to be predictive of histological grade and outcome in adult intracranial tumours. The purpose of this study was to determine whether a correlation of the pre-operative neutrophil count (NC) and NLCR with the final histological grade exists in paediatric intracranial tumours. METHODS A retrospective analysis was undertaken at a single centre. Patients less than 18 years old at the time of surgery who underwent tumour-related procedures from 2006 to 2015 were included. Patients with recurrent tumours, previous bone marrow transplant and metastases were excluded. Pre-operative full blood counts (FBC), collected before the diagnosis of intracranial pathology and before administration of steroids, were matched with histological diagnosis for each patient. Post-operative FBC was also recorded, together with survival data where applicable. RESULTS A total of 116 patients (74 male, 42 female; mean age, 8 ± 0.9 years) with a diagnosis of primary intracranial tumours had pre-operative FBC that could be matched to final histological grade. Pre-operative NC and NLCR were higher with increasing grade of tumour: grade 1 (NC 4.29 109/l, NLCR 2.26), grade 2 (NC 4.59 109/l, NLCR 2.38), grade 3 (NC 5.67 109/l, NLCR 2.72) and grade 4 (NC 6.59 109/l, NLCR 3.31). Patients with WHO grade 1 and 2 tumours pooled together had a lower NC (4.37 95% CI ± 0.67 109/l) compared to WHO grade 3 and 4 patients (6.41 95% CI ± 0.99 109/l, p = 0.0013). The NLCR was lower in grade 1 and 2 tumours (2.29 ± 0.59) (compared to grade 3 and 4 tumours; 3.20 ± 0.76) but this did not reach significance (p = 0.069). The subgroup of patients with pilocytic astrocytoma had a significantly lower NC when compared to patients with high-grade tumours (p = 0.005). Medulloblastoma and supratentorial PNET subgroups had significantly higher NC compared to the low-grade group (p = 0.033, p = 0.002). Post-operative NC was significantly higher in the high-grade tumours (p = 0.034), but no difference was observed for NLCR (p = 0.28). CONCLUSIONS No evidence exists to support the correlation of pre-operative NC or NLCR to histological diagnosis in paediatric intracranial tumours. Our results indicate that a higher pre-operative NC/NLCR correlates with a higher histological grade of tumour. This suggests that immunological mechanisms may be involved in the pathogenesis of paediatric brain tumours, and a further prospective study is required to substantiate and expand these findings.
Collapse
Affiliation(s)
- J R F Wilson
- Department of Neurosurgery, The General Infirmary at Leeds, Leeds, LS13EX, UK.
| | - F Saeed
- Department of Neurosurgery, The General Infirmary at Leeds, Leeds, LS13EX, UK
| | - A K Tyagi
- Department of Neurosurgery, The General Infirmary at Leeds, Leeds, LS13EX, UK
| | - J R Goodden
- Department of Neurosurgery, The General Infirmary at Leeds, Leeds, LS13EX, UK
| | - G Sivakumar
- Department of Neurosurgery, The General Infirmary at Leeds, Leeds, LS13EX, UK
| | - D Crimmins
- Department of Neurosurgery, Beaumont Hospital, Dublin, Ireland
| | - M Elliott
- Department of Paediatric Oncology and Haematology, Leeds Children's Hospital, Leeds General Infirmary, Leeds, LS13EX, UK
| | - S Picton
- Department of Paediatric Oncology and Haematology, Leeds Children's Hospital, Leeds General Infirmary, Leeds, LS13EX, UK
| | - P D Chumas
- Department of Neurosurgery, The General Infirmary at Leeds, Leeds, LS13EX, UK
| |
Collapse
|
15
|
Sharma AN, Kumar S, Tyagi AK. Effects of mannan-oligosaccharides and Lactobacillus acidophilus supplementation on growth performance, nutrient utilization and faecal characteristics in Murrah buffalo calves. J Anim Physiol Anim Nutr (Berl) 2018; 102:679-689. [PMID: 29493022 DOI: 10.1111/jpn.12878] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2017] [Accepted: 01/29/2018] [Indexed: 12/15/2022]
Abstract
A study of 120 days was undertaken to ascertain the effect of mannan-oligosaccharides (MOS) and Lactobacillus acidophilus supplementation on growth performance, nutrient utilization and faecal characteristics in Murrah buffalo calves. Twenty Murrah buffalo calves of 5-7 days old and 31 ± 2.0 kg of body weight (BW) were randomly assigned into four groups. Group I served as the control (CON) in which only basal diet (concentrate mixture and green fodder) was provided, without any supplementation. Mannan-oligosaccharides at 4 g/calf/day were supplemented as prebiotic to Group II (PRE), whereas Group III (PRO) received Lactobacillus acidophilus in the form of fermented milk as probiotic at 200 ml/calf/day having 108 CFU/ml and Group IV (SYN) was supplemented with both MOS and Lactobacillus acidophilus as synbiotic at similar dose. Final BW (kg), dry matter intake, average daily gain, feed conversion efficiency and structural growth measurements were improved (p < .05) in the treatment groups compared to control. Digestibility of neutral detergent fibre was higher (p < .05) in SYN followed by PRE and PRO than control. The faecal lactobacilli and bifidobacterium population was higher (p < .05) in all the supplemented groups with a concomitant reduction in faecal coliform count as compared to control. Faecal ammonia, lactate and pH were also altered favourably (p < .05) in all the supplemented groups as compared to CON. The faecal volatile fatty acids were higher (p < .05) in PRE, PRO and SYN group than CON. The incorporation of MOS and Lactobacillus acidophilus in diet either individually or in combination as synbiotic has the potential to improve the performance and faecal characteristics in Murrah buffalo calves; however, the observed responses among the treatment groups were more evident in the synbiotic fed group compared to individual supplementation of MOS and Lactobacillus acidophilus.
Collapse
Affiliation(s)
- A N Sharma
- Animal Nutrition Division, ICAR-National Dairy Research Institute, Karnal, India
| | - S Kumar
- Animal Nutrition Division, ICAR-National Dairy Research Institute, Karnal, India
| | - A K Tyagi
- Animal Nutrition Division, ICAR-National Dairy Research Institute, Karnal, India
| |
Collapse
|
16
|
Errandonea D, Gomis O, Rodríguez-Hernández P, Muñoz A, Ruiz-Fuertes J, Gupta M, Achary SN, Hirsch A, Manjon FJ, Peters L, Roth G, Tyagi AK, Bettinelli M. High-pressure structural and vibrational properties of monazite-type BiPO 4, LaPO 4, CePO 4, and PrPO 4. J Phys Condens Matter 2018; 30:065401. [PMID: 29337696 DOI: 10.1088/1361-648x/aaa20d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Monazite-type BiPO4, LaPO4, CePO4, and PrPO4 have been studied under high pressure by ab initio simulations and Raman spectroscopy measurements in the pressure range of stability of the monazite structure. A good agreement between experimental and theoretical Raman-active mode frequencies and pressure coefficients has been found which has allowed us to discuss the nature of the Raman-active modes. Besides, calculations have provided us with information on how the crystal structure is modified by pressure. This information has allowed us to determine the equation of state and the isothermal compressibility tensor of the four studied compounds. In addition, the information obtained on the polyhedral compressibility has been used to explain the anisotropic axial compressibility and the bulk compressibility of monazite phosphates. Finally, we have carried out a systematic discussion on the high-pressure behavior of the four studied phosphates in comparison to results of previous studies.
Collapse
Affiliation(s)
- D Errandonea
- Departamento de Física Aplicada-ICMUV, MALTA Consolider Team, Universitat de València, Edificio de Investigación, C/Dr. Moliner 50, Burjassot, 46100 Valencia, Spain
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
17
|
Chakraborty KR, Paul B, Shukla R, Krishna PSR, Kumar A, Mukadam MD, Mandal BP, Roy A, Tyagi AK, Yusuf SM. Revealing magnetic ordering and spin-phonon coupling in Y 1-x Tb x MnO 3 (0.1 ⩽ x ⩽ 0.3) compounds. J Phys Condens Matter 2017; 29:155804. [PMID: 28230540 DOI: 10.1088/1361-648x/aa6295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The structural and magnetic properties of the Y1-x Tb x MnO3 (0.1 ⩽ x ⩽ 0.3) compounds were investigated. Neutron diffraction patterns for all three samples, recorded at room temperature (RT), were fitted to the nuclear structure confirming the paramagnetic nature of the compounds. At 2.8 K, for the x = 0.1 sample magnetic moments of the Tb3+ ionic as well as Mn3+ ionic were ordered. At 5 K for the x = 0.2 sample only the Mn3+ ionic magnetic moments were ordered. There were six sites for Mn atoms. Three on the z = 0 plane and three on the z = 0.5 plane (where z corresponds to +c axis).The Mn3+ionic moments were confined to the a-b plane with a net magnitude of 2.78(3) µ B, and 2.90(3) µ B for the x = 0.1 and the x = 0.2 samples. The Tb3+ionic moments had a magnitude of 1.36(4) µ B at 2.8 K and were aligned antiferromagnetically along the crystallographic c-axis for the x = 0.1 sample. The low moment in comparison with Mn3+ free ions has been attributed to crystalline electric fields similar to that found in the parent compound YMnO3 and also in another rare earth manganite viz HoMnO3. The x = 0.3 sample was found to be a canonical spin glass. To investigate the role of the above spin ordering in Y1-x Tb x MnO3 in governing the phonon dynamics, temperature dependent Raman measurements were carried out. We observed the deviation of the phonon frequency near 685 cm-1 and its line-width from the expected anharmonic behaviour around magnetic ordering temperature for Tb substituted compounds with x = 0.1 and 0.2. This was attributed to the spin-phonon coupling in these systems. The anomalous behaviour of this phonon mode in the canonical spin glass compound with x = 0.3, indicated that the coupling sustained even in the presence of only local magnetic ordering.
Collapse
Affiliation(s)
- Keka R Chakraborty
- Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | | | | | | | | | | | | | | | | | | |
Collapse
|
18
|
Tran LV, Malla BA, Sharma AN, Kumar S, Tyagi N, Tyagi AK. Effect of omega-3 and omega-6 polyunsaturated fatty acid enriched diet on plasma IGF-1 and testosterone concentration, puberty and semen quality in male buffalo. Anim Reprod Sci 2016; 173:63-72. [PMID: 27596261 DOI: 10.1016/j.anireprosci.2016.08.012] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Revised: 08/26/2016] [Accepted: 08/28/2016] [Indexed: 11/25/2022]
Abstract
The objective of the present study was to evaluate the effect of omega-3 and omega-6 PUFA enriched diet on plasma IGF-1 and testosterone concentrations, puberty, sperm fatty acid profile and semen quality in male buffalo. Eighteen male buffalo calves were distributed randomly in three different groups and fed concentrate mixture along with green fodder and wheat straw in 50:40:10 ratios as per requirements. Basis ration of animals in group I was supplemented with 4% of prilled fat (PFA), while in group II and group III were added 4.67% of Calcium salt from Soybean (CaSFA) and Linseed oil (CaLFA), respectively. Male buffalo fed omega-3 PUFA high diet significantly increased concentrations of IGF-1 and testosterone in plasma as compared to two other diets (p<0.05). The age of puberty and scrotal circumference significantly increased by dietary fat effect (p<0.05) of which n-3 PUFA enriched diet (CaLFA) had the largest influence as compared to other diets (PFA and CaSFA). Feeding of n-3 PUFA rich diet significantly increased the DHA (C22:6n-3) content in sperm (p<0.05), which contributed to increased fluidity of plasma membrane, elevated quality of sperm (motility, viability) and in vitro fertility (plasma membrane integrity, acrosome integrity) in both fresh and post-thawing semen. These findings indicate that feeding of n-3 PUFA enriched diet increased IGF-1 and testosterone secretion, reduced pubertal age and improved both fresh and post-thawing semen quality in male buffalo.
Collapse
Affiliation(s)
- L V Tran
- Animal Nutrition Division, National Dairy Research Insititute, Karnal-132001, Haryana, India
| | - B A Malla
- Animal Nutrition Division, National Dairy Research Insititute, Karnal-132001, Haryana, India
| | - A N Sharma
- Animal Nutrition Division, National Dairy Research Insititute, Karnal-132001, Haryana, India
| | - Sachin Kumar
- Animal Nutrition Division, National Dairy Research Insititute, Karnal-132001, Haryana, India
| | - Nitin Tyagi
- Animal Nutrition Division, National Dairy Research Insititute, Karnal-132001, Haryana, India
| | - A K Tyagi
- Animal Nutrition Division, National Dairy Research Insititute, Karnal-132001, Haryana, India.
| |
Collapse
|
19
|
Popescu C, Garg AB, Errandonea D, Sans JA, Rodriguez-Hernández P, Radescu S, Muñoz A, Achary SN, Tyagi AK. Pressure-induced phase transformation in zircon-type orthovanadate SmVO4 from experiment and theory. J Phys Condens Matter 2016; 28:035402. [PMID: 26733093 DOI: 10.1088/0953-8984/28/3/035402] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The compression behavior of zircon-type samarium orthovanadate, SmVO4, has been investigated using synchrotron-based powder x-ray diffraction and ab initio calculations of up to 21 GPa. The results indicate the instability of ambient zircon phase at around 6 GPa, which transforms to a high-density scheelite-type phase. The high-pressure phase remains stable up to 21 GPa, the highest pressure reached in the present investigations. On pressure release, the scheelite phase is recovered. The crystal structure of the high-pressure phase and the equations of state for the zircon- and scheelite-type phases have been determined. Various compressibilities, such as the bulk, axial and bond compressibilities, estimated from the experimental data are found to be in good agreement with the results obtained from theoretical calculations. The calculated elastic constants show that the zircon structure becomes mechanically unstable beyond the transition pressure. Overall there is good agreement between the experimental and theoretical findings.
Collapse
Affiliation(s)
- C Popescu
- CELLS-ALBA Synchrotron Light facility, 08290 Cerdanyola, Barcelona, Spain
| | | | | | | | | | | | | | | | | |
Collapse
|
20
|
Sayed FN, Shukla R, Tyagi AK. A chemical method for stabilizing a new series of solid solution Pr1-xCexScO3 (0.0 ≤x≤ 1.0) systems. Dalton Trans 2015; 44:16929-36. [PMID: 26361068 DOI: 10.1039/c5dt01459j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new series of Pr1-xCexScO3 (0.0 ≤x≤ 1.0) compounds was synthesized by a two-step synthesis route, involving a combustion reaction followed by reduction while heating in a low partial pressure of O2, generated by a zirconium sponge that acts as an oxygen getter. For the first time, perovskite solid solution formation was observed in this series in the entire homogeneity range. These compounds were characterized using XRD, Raman spectroscopy and DRUV-visible spectroscopy. Rietveld refinement was carried out on the XRD data to determine unit cell parameters, bond lengths, bond angles along with the tilt angles for ScO6 octahedra. The analyses of the Raman shift were also in agreement with the XRD data. All compounds in this series showed a decreasing trend in the bandgap from 4.74 to 2.91 eV as a function of increasing Ce(3+) concentration.
Collapse
Affiliation(s)
- Farheen N Sayed
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India.
| | | | | |
Collapse
|
21
|
Singh SK, Talwar R, Kannan N, Tyagi AK, Jaiswal P, Kumar A. Aggressive Surgical Approach for Gallbladder Cancer: a Single-Center Experience from Northern India. J Gastrointest Cancer 2015; 46:399-407. [DOI: 10.1007/s12029-015-9766-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
|
22
|
Singh SK, Talwar R, Kannan N, Tyagi AK, Jaiswal P, Kumar A. Chemotherapy Compared with Best Supportive Care for Metastatic/Unresectable Gallbladder Cancer: a Non-randomized Prospective Cohort Study. Indian J Surg Oncol 2015; 7:25-31. [PMID: 27065678 DOI: 10.1007/s13193-015-0443-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Accepted: 07/01/2015] [Indexed: 02/06/2023] Open
Abstract
Gallbladder cancer (GBC) is the most common biliary tract malignancy. Incidence varies widely with geographic regions, with northern India being the endemic area for GBC. Curative surgery offers the only chance of cure, but most of patients present with unresectable or metastatic disease and are candidates for palliative treatment only. This study was designed to evaluate efficacy of chemotherapy over best supportive care in unresectable/metastatic GBC. Patients with unresectable/metastatic GBC with proven tissue diagnosis were enrolled for single institution non-randomized prospective cohort study between May 2012 and April 2014. A total of 65 patients received palliative chemotherapy; either combination chemotherapy (n = 59) or single agent chemotherapy (n = 6). Combination chemotherapy regimen were either three weekly Gemcitabine-Cisplatin (n = 45) or Gemcitabine-Oxaliplatin (n = 14) for a maximum of six cycles. Twenty patients, either unfit for chemotherapy or unwilling for the same were advised best supportive care (BSC). The overall response rate to chemotherapy was 34 %. Median survival for chemotherapy group and BSC group were 35.6 and 13 weeks, respectively (p value < 0.001). Median OS for combination chemotherapy (n = 59) and single agent chemotherapy (n = 6) were 37 and 26.7 weeks, respectively (p value- 0.002). Median PFS for combination chemotherapy and single agent chemotherapy were 26 and 15 weeks, respectively (p value-0.012). The results of this study are quite encouraging and support use of chemotherapy for unresectable GBC patients over best supportive care, and that gemcitabine based combination chemotherapy may be a better choice for response rates, OS, and PFS.
Collapse
Affiliation(s)
| | - Rajnish Talwar
- Army Hospital (Research & Referral), New Delhi-10, India
| | | | | | | | - Adarsh Kumar
- Army Hospital (Research & Referral), New Delhi-10, India
| |
Collapse
|
23
|
Grover V, Shukla R, Kumari R, Mandal BP, Kulriya PK, Srivastava SK, Ghosh S, Tyagi AK, Avasthi DK. Effect of grain size and microstructure on radiation stability of CeO2: an extensive study. Phys Chem Chem Phys 2015; 16:27065-73. [PMID: 25383891 DOI: 10.1039/c4cp04215h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
To investigate the variation in the radiation stability of ceria with microstructure under the electronic excitation regime, ceria samples sintered under different conditions were irradiated with high energy 100 MeV Ag ions. The ceria nanopowders were synthesized and sintered at 800 °C (S800), 1000 °C (S1000) and 1300 °C (S1300), respectively. The samples with widely varying grain size, densities and microstructure were obtained. The pristine and irradiated samples were studied by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). None of the samples amorphized up to the highest fluence of 1 × 10(14) ions per cm(2) employed in this study. XRD and Raman studies showed that the sample with lowest grain size suffered maximum damage while the sample with largest grain size was most stable and showed little change in crystallinity. Raman spectroscopy indicated the enhanced formation of Ce(3+) and related defects in the sample with larger grain size after irradiation. The most intriguing result was the absence of Ce(3+)-related defects in the sample with lowest grain size which actually showed maximum damage upon irradiation. The XPS studies on S800 and S1300 provided concrete evidence for the presence of Ce(3+) and oxygen ion vacancies in S1300. The grain boundaries and grain size dependent stability have been discussed.
Collapse
Affiliation(s)
- V Grover
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai-400085, India.
| | | | | | | | | | | | | | | | | |
Collapse
|
24
|
Jayakumar OD, Sudarsan V, Tyagi AK. Bifunctional Li and Co Doped ZnO Nanostructures Synthesized by Solvothermal Method: Stabilizer Controlled Shape and Size Tuning. J Nanosci Nanotechnol 2015; 15:2804-2809. [PMID: 26353496 DOI: 10.1166/jnn.2015.9752] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
1D nanostructures of ZnO, Zn0.95Co0.05O and Zn0.85Co0.05Li0.10 were synthesized by a solvothermal chemical method with and without using oleic acid as a stabilizer. We report a very interesting observation of both room temperature ferromagnetism and photoluminescence properties along with development of different morphological transformation of these nanostructures on doping Co and Li in ZnO in the presence and absence of oleic acid. Zn0.95Co0.05O sample prepared in the presence of oleic acid showed increased saturation magnetization value (~ 4.1 emu/g and) compared to Zn0.95Co0.05O prepared without oleic acid (~ 1.1 emu/g). In both the cases it is observed that Li incorporation further enhances the room temperature ferromagnetic (RTFM) behavior and saturation magnetization values (~ 6 emu/g) of luminescent Zn0.95Co0.05 nanostructures. These results are significant, as the luminescent 1 D RTFM materials will have implications in photo magnetic devices like magneto-optical switches and sensors.
Collapse
|
25
|
Singh SK, Kannan N, Talwar R, Tyagi AK, Madan R, Jaiswal P, Kumar A. Suture granuloma: a rare differential diagnosis of residual/recurrent gastrointestinal stromal tumor of stomach. Int Cancer Conf J 2015; 5:5-8. [PMID: 31149414 DOI: 10.1007/s13691-015-0216-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2014] [Accepted: 03/23/2015] [Indexed: 11/30/2022] Open
Abstract
In the present era of modern surgical practice, the incidence of intra-abdominal suture granuloma is extremely rare with reduced use of non-absorbable silk sutures and even rarer following laparoscopic procedures. We report herein a case of silk granuloma presenting as large submucosal polypoidal lesion in a recently operated case of gastrointestinal stromal tumor (GIST) of stomach. Though endoscopic biopsy showed chronic non-specific gastritis with no evidence of malignancy, our patient underwent excision of lesion due to high likelihood of neoplastic lesion suggested by radiological evaluation and recent history of surgery for GIST but histopathology surprisingly showed Giant cell silk granuloma. In summary, the possibility of suture granulomas should always be considered while evaluating postoperative CT scan/PET scan for a mass lesion at operated site, particularly in patients who have undergone surgery with non-absorbable silk sutures.
Collapse
Affiliation(s)
| | - Narayan Kannan
- Army Hospital (Research and Referral), New Delhi-10, India
| | - Rajnish Talwar
- Army Hospital (Research and Referral), New Delhi-10, India
| | | | - Renu Madan
- Army Hospital (Research and Referral), New Delhi-10, India
| | | | - Adarsh Kumar
- Army Hospital (Research and Referral), New Delhi-10, India
| |
Collapse
|
26
|
Dixit SP, Sivalingam J, Tyagi AK, Saroha V, Sharma A, Nagda RK. Association of novel SNPs in the candidate genes affecting caprine milk fatty acids related to human health. Meta Gene 2015; 4:45-56. [PMID: 25853060 PMCID: PMC4372655 DOI: 10.1016/j.mgene.2015.01.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Revised: 01/06/2015] [Accepted: 01/06/2015] [Indexed: 01/13/2023] Open
Abstract
In the present investigation, 618 milk samples of Sirohi breed of goat were collected, and analyzed for conjugated linoleic acid (CLA, C18:2) and other fatty acids. The CLA in studied goat milk samples was 4.87 mg/g of milk fat and C18:2 cis-9, trans-11 contributes 2.9 mg/g of milk fat and trans10 cis12 contributes 0.82 mg/g of milk fat. The saturated fatty acids in the milk accounted for 69.55% and unsaturated fatty acid accounted for 28.50%. The unsaturated fatty acid was constituted by monounsaturated fatty acid (24.57%) and polyunsaturated fatty acids (3.96%.). The major contribution (45.56%) in total fatty acid was of C12:0, C14:0 and C16:0. C18:0 and short chain ones (C4:0, C6:0, C8:0, and C10:0) have a neutral or cholesterol-decreasing effect. The DNA sequence analysis of the genes (DGAT1, SCAP, PPARG, OLR, FABP3 and PRL) in a random panel of 8 Sirohi goats revealed 38 SNPs across the targeted regions. Out of the studied SNPs (38) across these genes, 22 SNPs had significant effect on one or a group of fatty acids including CLA. The genotypes at these loci showed significant differences in the least square means of a particular fatty acid or a group of fatty acids including CLA and its isomers.
Collapse
Affiliation(s)
- S P Dixit
- National Bureau of Animal Genetic Resources, Karnal, Haryana, 131002, India
| | | | - A K Tyagi
- National Dairy Research Institute, Karnal, Haryana, 131002, India
| | - V Saroha
- National Bureau of Animal Genetic Resources, Karnal, Haryana, 131002, India
| | - A Sharma
- National Bureau of Animal Genetic Resources, Karnal, Haryana, 131002, India
| | - R K Nagda
- Rajasthan University of Veterinary and Animal Science, Vallabhnagar, Udaipur, Rajasthan, India
| |
Collapse
|
27
|
Joshi P, George RA, Tyagi AK, Sinha A. Efficacy of contrast enhanced grey scale ultrasound in characterisation of hepatic focal lesions: A pilot study. Med J Armed Forces India 2014; 70:230-6. [PMID: 25378775 DOI: 10.1016/j.mjafi.2014.05.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2013] [Accepted: 05/25/2014] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND Contrast enhanced ultrasound (CEUS) has recently gained widespread acceptance as an adjunct to conventional grey scale ultrasound. The present pilot study was undertaken to evaluate the efficacy of this technique in characterisation of hepatic focal lesions. METHODS Adult patients who had at least one focal liver lesion underwent ultrasound evaluation in regular and contrast mode before and after intravenous administration of sulphur hexafluoride. The diagnoses were confirmed by comparison with a reference standard (multidetector CT), response to treatment or pathological correlation. RESULTS The rate of correct diagnosis for unenhanced ultrasound was 54%, CEUS was 72% and multidetector CT (MDCT) was 92%. A comparison of unenhanced ultrasound versus CEUS using the McNemar test yielded a p value of 0.0704 (>0.05). However, comparison of CEUS versus MDCT using the McNemar test yielded a p value of 0.0265 (<0.05). Additionally, comparison of unenhanced ultrasound versus MDCT using the McNemar test yielded a p value of <0.0001. CONCLUSION CEUS increases diagnostic efficacy over unenhanced ultrasound but does not have any significant advantages over MDCT. Currently it may be used as a problem solving tool in atypical haemangiomas, echogenic focal liver lesions, contrast sensitivity and to avoid multiple studies utilising ionising radiation.
Collapse
Affiliation(s)
- P Joshi
- Classified Specialist (Radiodiagnosis), INHS Asvini, Colaba, Mumbai 400005, India
| | - R A George
- Senior Advisor (Radiodiagnosis), Command Hospital (Air Force), Bangalore 560007, India
| | - A K Tyagi
- Senior Advisor (Surgery and Surgical Oncology), Army Hospital (R&R), Delhi Cantt, India
| | - Anamika Sinha
- Classified Specialist (Pathology), Command Hospital (Northern Command), C/o 56 APO, India
| |
Collapse
|
28
|
Ramaseshan R, Sundari ST, Balamurugan AK, Dash S, Tyagi AK, Sato Y, Nakayama T, Suematsu H. Nanomechanical and optical properties of yttrium thin films by magnetron sputtering. Opt Lett 2014; 39:3086-3089. [PMID: 24875983 DOI: 10.1364/ol.39.003086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
This Letter reports on nanomechanical and optical properties of yttrium thin films deposited on an Si (100) wafer. Elemental depth profiling by a secondary ion mass spectrometer revealed absence of formation of yttrium hydride, both on the surface and beneath. The optical properties were investigated by spectroscopic ellipsometry, and the refractive indices extracted after suitable modeling were found to be 2.51 at 546 nm. Hardness and elastic modulus of these films were found to be 7 and 142 GPa, respectively. These studies indicate that yttrium thin films are suitable for x-ray mirrors, photocathode emitters in e-beam lithography, electron microscopes, and free-electron lasers.
Collapse
|
29
|
Uppugunduri CRS, Rezgui MA, Diaz PH, Tyagi AK, Rousseau J, Daali Y, Duval M, Bittencourt H, Krajinovic M, Ansari M. The association of cytochrome P450 genetic polymorphisms with sulfolane formation and the efficacy of a busulfan-based conditioning regimen in pediatric patients undergoing hematopoietic stem cell transplantation. Pharmacogenomics J 2013; 14:263-71. [PMID: 24165757 DOI: 10.1038/tpj.2013.38] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2013] [Revised: 08/06/2013] [Accepted: 09/09/2013] [Indexed: 11/09/2022]
Abstract
Cytochrome P450 enzymes (CYPs) and flavin-containing monooxygenases (FMOs) likely have a role in the oxidation of intermediate metabolites of busulfan (Bu). In vitro studies to investigate the involvement of these enzymes are cumbersome because of the volatile nature of the intermediate metabolite tetrahydrothiophene (THT) and the lack of sensitive quantitation methods. This study explored the association between the CYP2C9, CYP2C19, CYP2B6 and FMO3 genotypes and sulfolane (Su, a water soluble metabolite of Bu) plasma levels in children undergoing hematopoietic stem cell transplantation (HSCT). The relationship between these genotypes and the effectiveness of myeloablative conditioning was also analyzed. Sixty-six children receiving an intravenous Bu-based myeloablative conditioning regimen were genotyped for common functional variant alleles in CYP2C9 (*2 and *3), CYP2C19 (*2 and *17), FMO3 (rs2266780, rs2266782 and rs1736557) and CYP2B6 (*5 and *9). The plasma levels of Bu and its metabolite Su were measured after the ninth Bu dose in a subset of 44 patients for whom plasma samples were available. The ratio of Bu to Su was considered the metabolic ratio (MR) and was compared across the genotype groups. Higher MRs were observed in CYP2C9*2 and *3 allele carriers (mean±s.d.: 7.8±3.6 in carriers vs 4.4±2.2 in non-carriers; P=0.003). An increased incidence of graft failure was observed among patients with an MR>5 compared with those with MR values <5 (20% vs 0%; P=0.02). In contrast, a significantly higher incidence of relapse and graft failure (evaluated as event-free survival) was observed in patients with malignant disease who carried CYP2B6 alleles with reduced function on both chromosomes compared with carriers of at least one normal allele (100% vs 40%; P=0.0001). These results suggest that CYP2C9 has a role in the oxidation reactions of THT and indicate that it may be possible to predict the efficacy of Bu-based myeloablative conditioning before HSCT on the basis of CYP genotypes and Bu MRs.
Collapse
Affiliation(s)
- C R S Uppugunduri
- 1] Department of Pediatrics, Onco-Hematology unit, University Hospital of Geneva, Geneva, Switzerland [2] CANSEARCH Research Laboratory, Geneva Medical University, Geneva, Switzerland
| | - M A Rezgui
- Charles-Bruneau Cancer Center, CHU Sainte-Justine Research Center, Montreal, Quebec, Canada
| | - P H Diaz
- 1] Department of Pediatrics, Onco-Hematology unit, University Hospital of Geneva, Geneva, Switzerland [2] CANSEARCH Research Laboratory, Geneva Medical University, Geneva, Switzerland
| | - A K Tyagi
- 1] Department of Pediatrics, Onco-Hematology unit, University Hospital of Geneva, Geneva, Switzerland [2] CANSEARCH Research Laboratory, Geneva Medical University, Geneva, Switzerland
| | - J Rousseau
- Charles-Bruneau Cancer Center, CHU Sainte-Justine Research Center, Montreal, Quebec, Canada
| | - Y Daali
- 1] CANSEARCH Research Laboratory, Geneva Medical University, Geneva, Switzerland [2] Department of Clinical Pharmacology and Toxicology, Geneva University Hospitals, Geneva, Switzerland
| | - M Duval
- 1] Charles-Bruneau Cancer Center, CHU Sainte-Justine Research Center, Montreal, Quebec, Canada [2] Department of Pediatrics, Charles-Bruneau Cancer Center, CHU Sainte-Justine Research Center, Montreal, Quebec, Canada
| | - H Bittencourt
- 1] Charles-Bruneau Cancer Center, CHU Sainte-Justine Research Center, Montreal, Quebec, Canada [2] Department of Pediatrics, Charles-Bruneau Cancer Center, CHU Sainte-Justine Research Center, Montreal, Quebec, Canada
| | - M Krajinovic
- 1] Charles-Bruneau Cancer Center, CHU Sainte-Justine Research Center, Montreal, Quebec, Canada [2] Department of Pediatrics, Charles-Bruneau Cancer Center, CHU Sainte-Justine Research Center, Montreal, Quebec, Canada [3] Department of Pharmacology, University of Montreal, Montreal, Quebec, Canada
| | - M Ansari
- 1] Department of Pediatrics, Onco-Hematology unit, University Hospital of Geneva, Geneva, Switzerland [2] CANSEARCH Research Laboratory, Geneva Medical University, Geneva, Switzerland
| |
Collapse
|
30
|
Affiliation(s)
- V Felcida
- Department of Vitreoretinal Surgery, Birmingham & Midland Eye Centre, Birmingham, UK
| | | | | |
Collapse
|
31
|
Sahoo M, Mathews T, Antony RP, Krishna DN, Dash S, Tyagi AK. Physico-chemical processes and kinetics of sunlight-induced hydrophobic ↔ superhydrophilic switching of transparent N-doped TiO₂ thin films. ACS Appl Mater Interfaces 2013; 5:3967-3974. [PMID: 23591141 DOI: 10.1021/am400785x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Sunlight-responsive anatase N-doped TiO2 thin films undergoing reversible and switchable hydrophobic to superhydrophilic transition were synthesized by ultrasonic spray pyrolysis in a single step. Film thickness, roughness, surface morphology, crystal structure, composition, band gap, and wetting properties were studied using surface profilometry, scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, UV-vis spectroscopy, and water contact angle measurements, respectively. Surface X-ray photoelectron spectroscopy before and after sunlight irradiation revealed the major physicochemical process responsible for the hydrophobic → hydrophilic transition as surface hydroxylation and that responsible for hydrophilic → superhydrophilic transition as destruction of surface adsorbed organic species. The kinetic rates of the hydrophobic → superhydrophilic transition under sunlight and superhydrophilic → hydrophobic transition when kept under dark are found to be 0.215 min(-1) and 2.03 × 10(-4) min(-1), respectively.
Collapse
Affiliation(s)
- Madhusmita Sahoo
- Surface and Nanoscience Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, Tamil Nadu, India
| | | | | | | | | | | |
Collapse
|
32
|
Mittal R, Zbiri M, Schober H, Achary SN, Tyagi AK, Chaplot SL. Phonons and colossal thermal expansion behavior of Ag3Co(CN)6 and Ag3Fe(CN)6. J Phys Condens Matter 2012; 24:505404. [PMID: 23174851 DOI: 10.1088/0953-8984/24/50/505404] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Recently colossal volume thermal expansion has been observed in the framework compounds Ag(3)Co(CN)(6) and Ag(3)Fe(CN)(6). We have measured phonon spectra using neutron time-of-flight spectroscopy as a function of temperature and pressure. Ab initio calculations were carried out for the sake of analysis and interpretation. Bonding is found to be very similar in the two compounds. At ambient pressure, modes in the intermediate frequency part of the vibrational spectra in the Co compound are shifted slightly to higher energies as compared to the Fe compound. The temperature dependence of the phonon spectra gives evidence for a large explicit anharmonic contribution to the total anharmonicity for low-energy modes below 5 meV. We have found that modes are mainly affected by the change in size of the unit cell, which in turn changes the bond lengths and vibrational frequencies. Thermal expansion has been calculated via the volume dependence of phonon spectra. Our analysis indicates that Ag phonon modes within the energy range 2-5 meV are strongly anharmonic and major contributors to thermal expansion in both systems. The application of pressure hardens the low-energy part of the phonon spectra involving Ag vibrations and confirms the highly anharmonic nature of these modes.
Collapse
Affiliation(s)
- R Mittal
- Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India.
| | | | | | | | | | | |
Collapse
|
33
|
Narayanan TN, Mandal BP, Tyagi AK, Kumarasiri A, Zhan X, Hahm MG, Anantharaman MR, Lawes G, Ajayan PM. Hybrid multiferroic nanostructure with magnetic-dielectric coupling. Nano Lett 2012; 12:3025-30. [PMID: 22545916 DOI: 10.1021/nl300849u] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The development of methods to economically synthesize single wire structured multiferroic systems with room temperature spin-charge coupling is expected to be important for building next-generation multifunctional devices with ultralow power consumption. We demonstrate the fabrication of a single nanowire multiferroic system, a new geometry, exhibiting room temperature magnetodielectric coupling. A coaxial nanotube/nanowire heterostructure of barium titanate (BaTiO(3), BTO) and cobalt (Co) has been synthesized using a template-assisted method. Room temperature ferromagnetism and ferroelectricity were exhibited by this coaxial system, indicating the coexistence of more than one ferroic interaction in this composite system.
Collapse
Affiliation(s)
- T N Narayanan
- Department of Mechanical Engineering and Materials Science, Rice University, Houston, Texas 77005, United States
| | | | | | | | | | | | | | | | | |
Collapse
|
34
|
Basu A, Chandra A, Tyagi AK, Mukherjee GD. Reappearance of ferroelectric soft modes in the paraelectric phase of Pb(1-x)Ca(x)TiO3 at high pressures: Raman and x-ray diffraction studies. J Phys Condens Matter 2012; 24:115404. [PMID: 22356849 DOI: 10.1088/0953-8984/24/11/115404] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
High pressure Raman spectroscopy and x-ray diffraction measurements have been carried out on Pb(1-x)Ca(x)TiO(3) (x = 0.10 and 0.30). Using high pressure Raman spectroscopic data, it is observed that the phonon instability responsible for the ferroelectric phase reappears in the paraelectric phase after a critical pressure. The observed critical pressures in the Ca(2+) doped PbTiO(3) system are much lower than the unique pressures suggested for PbTiO(3) based materials. A suitable explanation is given to explain this lowering of critical pressure. It is also shown that the ferroelectric phase which stabilizes in the paraelectric phase has a tetragonal symmetry with space group I4cm.
Collapse
Affiliation(s)
- Abhisek Basu
- Department of Physical Sciences, Indian Institute of Science Education and Research-Kolkata, Mohanpur Campus, PO BCKV Campus Main Office, Nadia-741252, West Bengal, India
| | | | | | | |
Collapse
|
35
|
Mukherjee P, Roy M, Mandal BP, Choudhury S, Tewari R, Tyagi AK, Kale SP. Synthesis of uniform gold nanoparticles using non-pathogenic bio-control agent: evolution of morphology from nano-spheres to triangular nanoprisms. J Colloid Interface Sci 2011; 367:148-52. [PMID: 22047921 DOI: 10.1016/j.jcis.2011.08.085] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2011] [Revised: 08/10/2011] [Accepted: 08/11/2011] [Indexed: 10/16/2022]
Abstract
Green synthesis of gold nanospheres with uniform diameter and triangular nanoprisms with optically flat surface was carried out using a non-pathogenic bio-control agent Trichoderma asperellum for reduction of HAuCl(4). Kinetics of the reaction was monitored by UV-Vis absorption spectroscopy. No additional capping/complexing agent was used for stabilizing the gold nanoparticles. Evolution of morphology from pseudospherical nanoparticles to triangular nanoprisms was studied by transmission electron microscopy (TEM). It revealed that three or more pseudospheres fused to form nanoprisms of different shapes and sizes. Slow rate of reduction of HAuCl(4) by constituents of cell-free fungal extract was instrumental in producing such exotic morphologies. Isolation of gold nanotriangles from the reacting masses was achieved by differential centrifugation.
Collapse
Affiliation(s)
- P Mukherjee
- NABT Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | | | | | | | | | | | | |
Collapse
|
36
|
Swapna L, Khurana R, Kumar SV, Tyagi AK, Rao KV. Pollen-specific expression of Oryza sativa indica pollen allergen gene (OSIPA) promoter in rice and Arabidopsis transgenic systems. Mol Biotechnol 2011; 48:49-59. [PMID: 21061188 DOI: 10.1007/s12033-010-9347-5] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Earlier, a pollen-specific Oryza sativa indica pollen allergen gene (OSIPA), coding for expansins/pollen allergens, was isolated from rice, and its promoter--upon expression in tobacco and Arabidopsis--was found active during the late stages of pollen development. In this investigation, to analyze the effects of different putative regulatory motifs of OSIPA promoter, a series of 5' deletions were fused to β-glucuronidase gene (GUS) which were stably introduced into rice and Arabidopsis. Histochemical GUS analysis of the transgenic plants revealed that a 1631 bp promoter fragment mediates maximum GUS expression at different stages of anther/pollen development. Promoter deletions to -1272, -966, -617, and -199 bp did not change the expression profile of the pollen specificity. However, the activity of promoter was reduced as the length of promoter decreased. The region between -1567 and -199 bp was found adequate to confer pollen-specific expression in both rice and Arabidopsis systems. An approximate 4-fold increase in the GUS activity was observed in the pollen of rice when compared to that of Arabidopsis. As such, the OSIPA promoter seems promising for generation of stable male-sterile lines required for the production of hybrids in rice and other crop plants.
Collapse
Affiliation(s)
- L Swapna
- Centre for Plant Molecular Biology, Osmania University, Hyderabad 500007, Andhra Pradesh, India
| | | | | | | | | |
Collapse
|
37
|
Sayed FN, Grover V, Bhattacharyya K, Jain D, Arya A, Pillai CGS, Tyagi AK. Sm(2-x)Dy(x)Zr2O7 pyrochlores: probing order-disorder dynamics and multifunctionality. Inorg Chem 2011; 50:2354-65. [PMID: 21355629 DOI: 10.1021/ic200108u] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The present work involves the synthesis of a series of Sm(2-x)Dy(x)Zr(2)O(7) compounds (0.0 ≤ x ≤ 2.0) by a controlled gel combustion process. The powders were thoroughly analyzed by powder X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy, and diffuse-reflectance UV-visible spectroscopy. The powder XRD studies revealed the system to be single-phasic throughout with retention of pyrochlore-type ordering until 40 mol % of Dy(3+), beyond which the pyrochlore lattice gives way to the defect fluorite structure. Interestingly, Raman spectroscopic studies (as against XRD studies) showed retention of pyrochlore-type ordering throughout the homogeneity range of the compositions studied. This is perhaps the first study that reports retention of a weak pyrochlore-type superstructure in the Dy(2)Zr(2)O(7) system, which was otherwise known to crystallize in the defect fluorite system. The ionic conductivity measurements showed an increase in the activation energy (E(a)) with an increase in the mole percent of Dy(3+) owing to the decreased mobility with an increase in the degree of disorder. The system possesses a tunable band gap with varying amounts of Dy(3+). First-principles calculations were performed to support a decrease in the band gap of the doped system with an increase in the Dy(3+) content. The potential as photocatalysts of some of these compositions was explored, and they exhibited high photocatalytic activity for degradation of xylenol orange, with t(1/2) increasing from pure Sm(2)Zr(2)O(7) to pure Dy(2)Zr(2)O(7).
Collapse
Affiliation(s)
- Farheen N Sayed
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | | | | | | | | | | | | |
Collapse
|
38
|
Bedekar V, Dutta DP, Tyagi AK. White light emission from spin coated Gd2O3:Dy nano phosphors synthesized using polyol technique. J Nanosci Nanotechnol 2010; 10:8234-8238. [PMID: 21121321 DOI: 10.1166/jnn.2010.3008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Water dispersible Gd2O3:Dy3+ (2%) nanophosphors were synthesized through a facile polyol process and characterized by using X-ray diffraction (XRD), transmission electron microscopy (TEM), Dynamic Light Scattering (DLS) and photoluminescence (PL) spectrophotometry. The results of XRD, TEM and DLS show that resultant nanoparticles are single phasic and have spherical shape with 17 to 22% dispersibility. An efficient energy transfer was observed from host to the dopant ions. Characteristic blue and yellow emissions from Dy3+ ions were observed. The CIE coordinates of the nanophosphor lie in the white light region of the chromaticity diagram. Spin coating of the nanophosphor was done on quartz substrate. Bright white luminescence of this film was observed under ultraviolet light with lamda exc = 310 nm.
Collapse
Affiliation(s)
- Vinila Bedekar
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | | | | |
Collapse
|
39
|
Mandal BP, Shukla R, Achary SN, Tyagi AK. Crucial role of the reaction conditions in isolating several metastable phases in a Gd-Ce-Zr-O system. Inorg Chem 2010; 49:10415-21. [PMID: 20958063 DOI: 10.1021/ic1018482] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of samples with composition Gd(2-y)Ce(y)Zr(2)O(7) (0.0 ≤ y ≤ 2.0) were prepared by the gel combustion method followed by high-temperature reduction. The details of the structural variations as a function of the composition, temperature, and oxygen stoichiometry have been investigated by X-ray diffraction (XRD), high-temperature XRD (HT-XRD), and thermogravimetry. A complete solubility of Gd(3+) in Ce(2)Zr(2)O(7) and Ce(2)Zr(2)O(8) could be achieved by this adaptive preparative method. Analysis of the XRD data revealed a sequential variation of the structural features with oxygen stoichiometry as well as Gd(3+) contents in these compositions. The variation in the unit cell parameter along the compositions has a strong influence on the oxygen uptake behavior in the Gd(2-y)Ce(y)Zr(2)O(7) system, as observed from the thermogravimetric and HT-XRD studies. The preparation and stability of various metastable phases in Gd-Ce-Zr-O have been addressed in detail. The details of the study will be useful for the design and application of a potential redox catalyst and an oxygen storage capacitor.
Collapse
Affiliation(s)
- B P Mandal
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | | | | | | |
Collapse
|
40
|
Manikandan E, Moodley MK, Sinha Ray S, Panigrahi BK, Krishnan R, Padhy N, Nair KGM, Tyagi AK. Zinc oxide epitaxial thin film deposited over carbon on various substrate by pulsed laser deposition technique. J Nanosci Nanotechnol 2010; 10:5602-5611. [PMID: 21133080 DOI: 10.1166/jnn.2010.2478] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Zinc Oxide (ZnO) is a promising candidate material for optical and electronic devices due to its direct wide band gap (3.37 eV) and high exciton binding energy (60 meV). For applications in various fields such as light emitting diode (LED) and laser diodes, growth of p-type ZnO is a prerequisite. ZnO is an intrinsically n-type semiconductor. In this paper we report on the synthesis of Zinc Oxide-Carbon (ZnO:C) thin films using pulsed laser deposition technique (PLD). The deposition parameters were optimized to obtain high quality epitaxial ZnO films over a carbon layer. The structural and optical properties were studied by glazing index X-ray diffraction (GIXRD), photoluminescence (PL), optical absorption (OA), and Raman spectroscopy. Rutherford backscattering spectroscopy (RBS), scanning electron microscopy with energy dispersive spectroscopy (SEMEDS) and atomic force microscopy (AFM) were employed to determine the composition and surface morphology of these thin films. The GIXRD pattern of the synthesized films exhibited hexagonal wurtzite crystal structure with a preferred (002) orientation. PL spectroscopy results showed that the emission intensity was maximum at -380 nm at a deposition temperature of 573 K. In the Raman spectra, the E2 phonon frequency around at 438 cm(-1) is a characteristic peak of the wurtzite lattice and could be seen in all samples. Furthermore, the optical direct band gap of ZnO films was found to be in the visible region. The growth of the epitaxial layer is discussed in the light of carbon atoms from the buffer layer. Our work demonstrates that the carbon is a novel dopant in the group of doped ZnO semiconductor materials. The introduction of carbon impurities enhanced the visible emission of red-green luminescence. It is concluded that the carbon impurities promote the zinc related native defect in ZnO.
Collapse
Affiliation(s)
- E Manikandan
- DST/CSIR Nanotechnology Innovation Centre, National Centre for Nano-Structured Materials, Council for Scientific and Industrial Research, Pretoria 0001, Republic of South Africa
| | | | | | | | | | | | | | | |
Collapse
|
41
|
Tyagi AK, Mirdha BR, Luthra K, Guleria R, Mohan A, Singh UB, Samantaray JC, Dar L, Iyer VK, Sreenivas V. Pneumocystis jirovecii dihydropteroate synthase (DHPS) genotypes in non-HIV-immunocompromised patients: a tertiary care reference health centre study. Med Mycol 2010; 49:167-71. [PMID: 20718608 DOI: 10.3109/13693786.2010.505584] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Studies on Pneumocystis jirovecii dihydropteroate synthase (DHPS) genotypes among non-HIV immunocompromised patients from developing countries are rare. In the present prospective investigation, 24 (11.8%) cases were found to be positive for Pneumocystis jirovecii out of 203 non-HIV patients with a clinical suspicion of Pneumocystis pneumonia (PCP). Dihydropteroate synthase (DHPS) genotype 1 (Thr55+Pro57) was noted in 95.8% P. jirovecii isolates in the present study in contrast to only 4.1% of patients with DHPS genotype 4 (Thr55Ala + Pro57Ser).
Collapse
Affiliation(s)
- A K Tyagi
- Department of Microbiology, All India Institute of Medical Sciences (AIIMS), New Delhi, India
| | | | | | | | | | | | | | | | | | | |
Collapse
|
42
|
Gupta AK, Reddy VP, Lavania M, Chauhan DS, Venkatesan K, Sharma VD, Tyagi AK, Katoch VM. jefA (Rv2459), a drug efflux gene in Mycobacterium tuberculosis confers resistance to isoniazid & ethambutol. Indian J Med Res 2010; 132:176-188. [PMID: 20716818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2023] Open
Abstract
BACKGROUND & OBJECTIVES Drug efflux pumps have been contributing factor(s) in the development of multidrug resistance in various clinically relevant bacteria. During efflux pump gene expression studies on mycobacteria, we have found a previously uncharacterized open reading frame (ORF) Rv2459 to be overexpressed in drug stressed conditions. The objective of the present study was to investigate the role of this ORF as a drug efflux pump, which might add new information in our understanding about the alternative mechanisms of drug resistance in mycobacteria. METHODS The open reading frame Rv2459 of Mycobacterium tuberculosis encoding a probable drug efflux protein has been cloned using pSD5 E.coli-Mycobacterium shuttle vector and overexpressed in M. tuberculosis H(37)Rv. This ORF was named as jefA. Overexpression of this gene in clones has been verified by real-time reverse transcription PCR. Minimum inhibitory concentrations (MICs) of recombinant as well as non-recombinant clones were determined by resazurin microtitre assay plate method (REMA) with and without efflux pump inhibitors carbonyl cyanide m-chlorophenylhydrazone (CCCP) and verapamil. RESULTS In recombinant strains of M. tuberculosis, the overexpression of this gene led to an increase in MIC of anti-tubercular drugs isoniazid and ethambutol when tested by REMA. In the presence of CCCP and verapamil, the recombinant strains showed decrease in MIC for these drugs. Bioinformatic analysis has shown a close relation of JefA protein with drug efflux pumps of other clinically relevant bacteria. In homology derived structure prepared from nearest available model, it was observed that amino acids forming TMH 1, 8 and 11 participated in ethambutol specificity and those forming TMH 2, 7 and 10 participated in isoniazid specificity in JefA. INTERPRETATION & CONCLUSION The increased transcription of jefA leads to increased resistance to ethambutol and isoniazid in M. tuberculosis via efflux pump like mechanism and contributes in the development of resistance to these drugs. JefA amino acid sequence is well conserved among clinically important bacterial genera, which further provides evidence of being a potent drug efflux pump. The involvement in drug resistance and very little homology with any of the human proteins makes JefA important to be included in the list of potential drug targets.
Collapse
Affiliation(s)
- Anuj Kumar Gupta
- Department of Microbiology & Molecular Biology, National JALMA Institute for Leprosy & Other Mycobacterial Diseases (ICMR), Agra, India
| | | | | | | | | | | | | | | |
Collapse
|
43
|
Jayakumar OD, Achary SN, Sudakar C, Naik R, Salunke HG, Rao R, Peng X, Ahuja R, Tyagi AK. Experimental and theoretical investigations on magnetic behavior of (Al,Co) co-doped ZnO nanoparticles. Nanoscale 2010; 2:1505-1511. [PMID: 20820743 DOI: 10.1039/c0nr00195c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We present the structural and magnetic properties of Zn(0.95-x)Co(0.05)Al(x)O (x = 0.0 to 0.1) nanoparticles, synthesized by a novel sol-gel route followed by pyrolysis. Powder X-ray diffraction data confirms the formation of a single phase wurtzite type ZnO structure for all the compositions. The Zn(0.95)Co(0.05)O nanoparticles show diamagnetic behavior at room temperature. However, when Al is co-doped with Co with x = 0.0 to 0.10 in Zn(0.95-x)Co(0.05)Al(x)O, a systematic increase in ferromagnetic moment is observed up to x = 0.07 at 300 K. Above x = 0.07 (e.g. for x = 0.10) a drastic decrease in ferromagnetic nature is observed which is concomitant with the segregation of poorly crystalline Al rich ZnO phase as evidenced from TEM studies. Theoretical studies using density functional calculations on Zn(0.95-x)Co(0.05)Al(x)O suggest that the partial occupancy of S2 states leads to an increased double exchange interaction favoring the ferromagnetic ground states. Such ferromagnetic interactions are favorable beyond a threshold limit. At a high level doping of Al, the exchange splitting is reduced, which suppresses the ferromagnetic ordering.
Collapse
Affiliation(s)
- O D Jayakumar
- Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India
| | | | | | | | | | | | | | | | | |
Collapse
|
44
|
Dutta DP, Jayakumar OD, Tyagi AK, Girija KG, Pillai CGS, Sharma G. Effect of doping on the morphology and multiferroic properties of BiFeO3 nanorods. Nanoscale 2010; 2:1149-1154. [PMID: 20648341 DOI: 10.1039/c0nr00100g] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
In this study we report the synthesis of BiFeO(3) nanorods using a sonochemical technique. The nanorods had a diameter of 20-50 nm, a length of 100-500 nm and exhibit aspect ratios in the range of 5-10. However, after doping, the TEM images of Bi(0.9)Ba(0.1)Fe(0.9)Mn(0.1)O(3) and Bi(0.9)Ca(0.1)Fe(0.9)Cr(0.1)O(3) samples show that the aspect ratios of both the double doped samples have reduced considerably, while retaining the crystallinity of the particles. BiFeO(3) nanorods show a weak ferromagnetic order at room temperature, which is quite different from the linear M-H relationship reported for bulk BiFeO(3). The saturation magnetization of these BiFeO(3) nanostructures has been found to increase on doping with various metal ions (Ba(2+), Ca(2+), Mn(2+), Cr(3+)), reaching a maximum value of 1.35 emu g(-1) for the Bi(0.9)Ba(0.1)Fe(0.9)Mn(0.1)O(3) nanostructures. However, saturation of electric polarization was observed only in case of the Bi(0.9)Ca(0.1)Fe(0.9)Cr(0.1)O(3) nanostructures.
Collapse
Affiliation(s)
- Dimple P Dutta
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.
| | | | | | | | | | | |
Collapse
|
45
|
Chakravarty R, Shukla R, Ram R, Venkatesh M, Dash A, Tyagi AK. Nanoceria-PAN composite-based advanced sorbent material: a major step forward in the field of clinical-grade 68Ge/68Ga generator. ACS Appl Mater Interfaces 2010; 2:2069-2075. [PMID: 20568699 DOI: 10.1021/am100325s] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The (68)Ge/(68)Ga generator has high potential for clinical positron emission tomography (PET) imaging. However, because of the unavailability of a suitable sorbent material, the commercially available (68)Ge/(68)Ga generators are not directly adaptable for the preparation of (68)Ga-labeled radiopharmaceuticals. In view of this, a new nanoceria-polyacrylonitrile (PAN) composite sorbent has been synthesized by decomposition of a cerium oxalate precursor to cerium oxide and its subsequent incorporation in PAN matrix for the development of a clinical grade (68)Ge/(68)Ga generator. The X-ray diffraction (XRD) studies and BET nitrogen adsorption technique revealed that nanocrystalline ceria had an average particle size of approximately 10 nm, surface area of 72 +/- 3 m(2)/g and an average pore size of 3.8 +/- 0.1 A. Investigation of the distribution ratio (K(d)) values for the prepared sorbent in 0.01 N HCl medium revealed the suitability of the sorbent for the quantitative retention of (68)Ge and efficient elution of clinical grade (68)Ga. A 370 MBq (10 mCi) (68)Ge/(68)Ga chromatographic generator was developed using this sorbent. (68)Ga could be regularly eluted from this generator with >80% elution yield. The eluted (68)Ga possess high radionuclidic purity (<1 x 10(-5)% of (68)Ge impurity), chemical purity (<0.1 ppm of Ce, Fe and Mn ions) and was amenable for the preparation of (68)Ga-labeled radiopharmaceuticals. The generator gave a consistent performance with respect to the elution yield and purity of (68)Ga over an extended period of 7 months.
Collapse
Affiliation(s)
- Rubel Chakravarty
- Radiopharmaceuticals Division, Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | | | | | | | | | | |
Collapse
|
46
|
Tirumalesh K, Shivanna K, Sriraman AK, Tyagi AK. Assessment of quality and geochemical processes occurring in groundwaters near central air conditioning plant site in Trombay, Maharashtra, India. Environ Monit Assess 2010; 163:171-184. [PMID: 19277886 DOI: 10.1007/s10661-009-0825-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2008] [Accepted: 02/05/2009] [Indexed: 05/27/2023]
Abstract
This paper summarizes the findings obtained in a monitoring study to understand the sources and processes affecting the quality of shallow and deep groundwater near central air conditioning plant site in Trombay region by making use of physicochemical and biological analyses. All the measured parameters of the groundwaters indicate that the groundwater quality is good and within permissible limits set by (Indian Bureau of Standards 1990). Shallow groundwater is dominantly of Na-HCO(3) type whereas deep groundwater is of Ca-Mg-HCO(3) type. The groundwater chemistry is mainly influenced by dissolution of minerals and base exchange processes. High total dissolved solids in shallow groundwater compared to deeper ones indicate faster circulation of groundwater in deep zone preferably through fissures and fractures whereas groundwater flow is sluggish in shallow zone. The characteristic ionic ratio values and absence of bromide point to the fact that seawater has no influence on groundwater system.
Collapse
Affiliation(s)
- K Tirumalesh
- Isotope Hydrology Section, Isotope Applications Division, Bhabha Atomic Research Centre, Mumbai, India.
| | | | | | | |
Collapse
|
47
|
Sinha S, Singh SN, Saha M, Kain TC, Tyagi AK. Antioxidant and oxidative stress responses of sojourners at high altitude in different climatic temperatures. Int J Biometeorol 2010; 54:85-92. [PMID: 20099373 DOI: 10.1007/s00484-009-0257-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
High altitude (HA) is a multi-stressor environment comprising hypobaric hypoxia and cold. Climatic temperature varies with seasonal variation at HA. The present study was undertaken to investigate the effect of ambient temperature on antioxidant profile among sojourners at HA. The study was conducted on sojourners exposed to an altitude of 4,560 m in two different seasons and categorized into two groups (SOJ 1, n=63, ambient temp. at HA: -6 degree to +10degreeC; SOJ 2, n=81, ambient temp. at HA: 3degree-22degreeC). Blood was collected at sea level (SL) and after 4 weeks of HA exposure. Antioxidant enzymes showed significant upregulation in SOJ 2 at HA. In SOJ 1, superoxide dismutase and glutathione peroxidase showed significant upregulation but catalase and glutathione reductase showed significant decrease at HA. Non-enzymatic antioxidants showed significant reduction in SOJ 1 whereas a sustained antioxidant profile was observed in SOJ 2 at HA. Oxidative stress markers showed higher levels in SOJ 1 than SOJ 2 at HA. Differences observed between SOJ 1 and SOJ 2 at HA may be the consequence of different environmental temperatures. Cold stress was higher in SOJ 1 as evidenced from the significantly lower oral temperature in SOJ 1 as compared to SOJ 2. Cold- and hypoxia-induced increase in energy expenditure was significantly high in SOJ 1 than SOJ 2. To conclude, chronic exposure to hypoxia in moderate climatic temperature has a potential preconditioning effect on antioxidant system, but exposure to both cold and hypoxia causes greater oxidative stress due to altered metabolic rate.
Collapse
Affiliation(s)
- Sanchari Sinha
- Environmental Physiology Division, Defence Institute of Physiology and Allied Sciences Timarpur, Lucknow Road, Delhi 110054, India
| | | | | | | | | |
Collapse
|
48
|
Ramkumar J, Chandramouleeswaran S, Sudarsan V, Mishra RK, Kaushik CP, Raj K, Tyagi AK. Barium borosilicate glass as a matrix for the uptake of dyes. J Hazard Mater 2009; 172:457-464. [PMID: 19656619 DOI: 10.1016/j.jhazmat.2009.07.028] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2008] [Revised: 07/07/2009] [Accepted: 07/07/2009] [Indexed: 05/28/2023]
Abstract
Barium borosilicate (BBS) and sodium borosilicate (SBS) glass samples, prepared by the conventional melt-quench method, were used for the uptake of Rhodamine 6G dye from aqueous solution. The experimental conditions were optimized to get maximum uptake and was found to be 0.4 mg of dye per gram of BBS glass sample. For the same network former to modifier ratio, barium borosilicate glasses are found to have improved extent of uptake for the dye molecules from aqueous solutions compared to sodium borosilicate glasses. Based on 29Si MAS NMR studies on these glasses, it is inferred that significantly higher number of non-bridging oxygen atoms present in barium borosilicate glasses compared to sodium borosilicate glasses is responsible for its improved uptake of Rhodamine 6G dye. 11B MAS NMR studies have confirmed the simultaneous existence of boron in BO3 and BO4 configurations in both barium borosilicate and sodium borosilicate glasses. The luminescence studies have established that the dye molecule is incorporated into the glass matrix through ion exchange mechanism by replacing the exchangeable ions like Na+/Ba2+ attached with the non-bridging oxygen atoms present in the glass.
Collapse
Affiliation(s)
- Jayshree Ramkumar
- Analytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai-400085, India.
| | | | | | | | | | | | | |
Collapse
|
49
|
Vishwakarma V, Josephine J, George RP, Krishnan R, Dash S, Kamruddin M, Kalavathi S, Manoharan N, Tyagi AK, Dayal RK. Antibacterial copper-nickel bilayers and multilayer coatings by pulsed laser deposition on titanium. Biofouling 2009; 25:705-710. [PMID: 20183129 DOI: 10.1080/08927010903132183] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Biofouling, especially microfouling, is a major concern with the use of titanium (Ti) in the marine environment as a condenser material in cooling water systems. Earlier, copper-nickel (Cu/Ni) alloys were extensively used in marine environments due to their high corrosion and biofouling resistance. However, the choice of condenser material for the new fast breeder reactor in Kalpakkam is Ti to avoid steam side corrosion problems, which may pose a threat to steam generator parts having sodium as the secondary coolant. This study evaluates the surface modification of Ti using nano films of copper (Cu) and nickel (Ni) to utilize the antibacterial property of copper ions in reducing microfouling. The surface modification of Ti was carried out by the deposition of a Cu/Ni bilayer and (Cu/Ni)(10) multilayer films using a pulsed laser deposition technique. Various surface characterization studies revealed that the deposited Cu/Ni films were thin and nanocrystalline in nature. The antibacterial properties were evaluated using total viable count and epifluorescence microscopic techniques. The results showed an apparent decrease in bacterial attachment on multilayered and bilayered Cu/Ni thin films on Ti surfaces. Comparative studies between the two types of films showed a bigger reduction in numbers of microorganisms on the multilayers.
Collapse
Affiliation(s)
- Vinita Vishwakarma
- Centre for Nanoscience and Nanotechnology, Sathyabama University, Chennai, India.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
50
|
Vishwakarma V, Manoharan N, George RP, Dash S, Kamruddin M, Tyagi AK, Daya RK. Surface modification of titanium using nanothin films of copper for biofouling control. J Nanosci Nanotechnol 2009; 9:5480-5483. [PMID: 19928248 DOI: 10.1166/jnn.2009.1180] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Biofouling is one of the major impediment in the use of titanium, which is otherwise excellent material with respect to corrosion resistance and mechanical properties, for seawater-cooled condensers of power plants. The routine chlorination treatment and sponge ball cleaning may not be successful to keep the titanium condenser tube clean over a period extending to years. This brings into focus the relevance of surface modification of titanium to improve the antimicrobial properties, which can effectively supplement the present treatment programmes. In this study antimicrobial thin film of copper (Cu) is developed on titanium surfaces, as copper is known to be very toxic to microorganisms and effectively kills most of the microbes by blocking the respiratory enzyme system. The preparation of nanocrystalline thin films of copper on titanium surfaces was done by pulsed DC magnetron-sputtering technique. Then this thin film was characterized using Glancing Incidence X-ray Diffraction (GIXRD) and Atomic Force Microscopy (AFM). Antimicrobial properties of these specimens were evaluated by exposure studies in seawater. Results showed two order decrease in the bacterial density on copper coated surface and epifluorescence micrographs depicted very few fluorescing cells and no biofilm formation clearly demonstrating the superior antibacterial capability of this nanocrystalline copper thin film.
Collapse
|