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Malouff T, Bennion N, Verma V, Lin C. The Efficacy of a Second Course of Stereotactic Radiosurgery (SRS) in Recurrent or Progressive Brain Metastases. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Cooper H, Bhattacharya B, Verma V, McCulloch AJ, Smellie WSA, Heald AH. Liquorice and soy sauce, a life-saving concoction in a patient with Addison's disease. Ann Clin Biochem 2016; 44:397-9. [PMID: 17594790 DOI: 10.1258/000456307780945624] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Addison's disease is a relatively common disorder to endocrinologists, but is rare and potentially fatal when presenting acutely. Treatment now involves replacement of glucocorticoids and mineralocorticoids with synthetic compounds, although historically patients took common salt and plant-based preparations. We describe the case of a 42-year-old woman who self-treated undiagnosed Addison's disease for several years with soy sauce and liquorice sticks. She presented with a four-week history of decreased energy, malaise and postural dizziness. Our patient described an unusual diet of liquorice sticks and soy sauce, consuming around 46 g of salt per week. There was a family history of Type 1 diabetes mellitus. Physical examination was unremarkable, although subsequent investigation confirmed Addison's disease. Liquorice provided glycyrrhizic acid and glycyrrhetinic acid, which act on 11-beta hydroxysteroid dehydrogenase enzymes. In this case, the net effect was potentiation of glucocorticoid action on renal mineralocorticoid receptors in the context of failing adrenocortical steroid production. The case highlights the importance of taking a dietary history to aid diagnosis.
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Verma V, Filliatre P, Hellesen C, Jacobsson Svärd S, Jammes C. Neutron flux monitoring with in-vessel fission chambers to detect an inadvertent control rod withdrawal in a sodium-cooled fast reactor. ANN NUCL ENERGY 2016. [DOI: 10.1016/j.anucene.2016.04.019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Li LY, Li MM, Yang SF, Zhang J, Li Z, Zhang H, Zhu L, Zhu X, Verma V, Liu Q, Shi D, Huang B. Inhibition of FGF Signalling Pathway Augments the Expression of Pluripotency and Trophoblast Lineage Marker Genes in Porcine Parthenogenetic Blastocyst. Reprod Domest Anim 2016; 51:649-56. [DOI: 10.1111/rda.12725] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2015] [Accepted: 05/30/2016] [Indexed: 11/30/2022]
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Verma V, Ramamoorthi M, Morris M, Siddiqui F, Esfandiari S. The Effect of Phentolamine on Reversing Soft Tissue Anesthesia: An Oral Health Technology Assessment Report. JDR Clin Trans Res 2016; 1:178-190. [PMID: 30931798 DOI: 10.1177/2380084416651225] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Long-lasting numbness of soft tissues such as lips, tongue, and cheeks after dental anesthesia is not only unpleasant but has the potential to cause self-inflicted damage to the numb tissue. Phentolamine mesylate, when injected in vicinity to the site of local anesthesia, accelerates the absorption of local anesthesia. Dental use of this drug was approved in the United States and Canada in 2008 and 2014, respectively. The rapidly increasing popularity of this novel technology (intraoral phentolamine injections) warrants a health technology assessment for clinicians. A medical librarian conducted a systematic literature search (up to March 1, 2016) for any clinical study involving intraoral phentolamine injection. Meta-analysis of the efficacy data from 4 clinical studies supports the role of intraoral phentolamine injections in shortening the duration of numbness after local anesthesia. No publication bias was found in the selected studies. The selected studies identified no serious adverse events other than pain at the site of injection and some postprocedural pain. Our cost-effectiveness analysis shows phentolamine mesylate to be an effective treatment modality when compared with no treatment, sham, or placebo injection. Phentolamine mesylate incurs an additional cost (in US dollars) of $0.13 to $0.16 per minute of reversing the soft tissue local anesthesia and $0.38 to $0.46, when compared with sham or placebo injection, after a noninvasive dental procedure. The literature lacked substantial evidence in favor of clinical benefits, such as a decrease in self-inflicted injuries. Only a subgroup of the dental patient population undergoing specific dental procedures would benefit from accelerated recovery from numbness. Knowledge Transfer Statement: Intraoral phentolamine to reverse numbness is a new intervention with ambiguous utility. With consideration of cost and patient preference, evidence generated by this report may be used in clinical decision making and case selection for this intervention.
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Zhu X, Lei Y, Zheng D, Li S, Verma V, Zhang M, Chang S, Song H, Enke C, Zhou S. SU-G-201-16: Thermal Imaging in Source Visualization and Radioactivity Measurement for High Dose Rate Brachytherapy. Med Phys 2016. [DOI: 10.1118/1.4956889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Lei Y, Zhu X, Zheng D, Li S, Ma R, Zhang M, Fan Q, Wang X, Verma V, Tang X, Zhou S. MO-FG-BRA-02: A Feasibility Study of Integrating Breathing Audio Signal with Surface Surrogates for Respiratory Motion Management. Med Phys 2016. [DOI: 10.1118/1.4957285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Ma R, Zhu X, Li S, Zheng D, Lei Y, Wang S, Verma V, Bennion N, Wahl A, Zhou S. WE-DE-201-02: A Statistical Analysis Tool for Plan Quality Verification in HDR Brachytherapy Forward Planning for Cervix Cancer. Med Phys 2016. [DOI: 10.1118/1.4957807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Zhu X, Li S, Zheng D, Wang S, Lei Y, Zhang M, Ma R, Fan Q, Wang X, Li X, Verma V, Enke C, Zhou S. SU-G-BRB-04: Automated Output Factor Measurements Using Continuous Data Logging for Linac Commissioning. Med Phys 2016. [DOI: 10.1118/1.4956911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Bennion N, Lei Y, Verma V, Bhirud A, Blessie G, Lin C. EP-1281: DVH relationships in rectal cancer: effects of contouring methods and patient positioning. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)32531-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Verma V, Liu J, Adkins D, Piccirillo J, Nussenbaum B, Thorstad W, Gay H. Presence of Preradiation Therapy Feeding Tube Associated With Poor Prognostic Subset of Postoperative p16-Positive Oropharyngeal Carcinoma. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2015.12.129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Elhammali A, Patel M, Weinberg B, Verma V, Liu J, Olsen J, Gay H. Late Gastrointestinal Tissue Effects After Hypofractionated Radiation Therapy of the Pancreas. Int J Radiat Oncol Biol Phys 2015. [DOI: 10.1016/j.ijrobp.2015.07.1969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Bennion N, Malouff T, Verma V, Wahl A, Zhen W, Lin C. A Comparison of Clinical Outcomes Between Frame-based and Frameless Stereotactic Radiosurgery for Brain Metastases. Int J Radiat Oncol Biol Phys 2015. [DOI: 10.1016/j.ijrobp.2015.07.718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Zhu X, Cai J, Lian J, Driewer J, Chang S, Li S, Verma V, Lei Y, Wang S, Zheng D, Zhang M, Zhang Q, Zhou S, Enke C. A Touchless Tool to Improve Gated Radiation Therapy: Thermal Camera Based Breathing Phase Monitoring. Int J Radiat Oncol Biol Phys 2015. [DOI: 10.1016/j.ijrobp.2015.07.1968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Verma V, Liu J, Lewis J, Adkins D, Nussenbaum B, Thorstad W, Gay H. PO-122: Pre-radiation feeding tube marks a poor prognostic subset of postoperative p16+ oropharyngeal cancer. Radiother Oncol 2015. [DOI: 10.1016/s0167-8140(15)34882-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Verma V, Ray S, Bajaj R, Kumar A. Effect of prolonged exercise on blood glucose levels of under-trainee divers : A pilot study. JOURNAL OF MARINE MEDICAL SOCIETY 2015. [DOI: 10.4103/0975-3605.203392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Goyal P, Verma V, Singh RK. Flow accelerated corrosion study in feeder pipes. KERNTECHNIK 2014. [DOI: 10.3139/124.110401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
The Indian Pressurized Heavy Water Reactor (PHWR) core consists of a number of horizontal channels containing nuclear fuel bundles. Parallel coolant channels are connected to Inlet and Outlet header through feeder pipes. Coolant from Reactor Inlet Header is distributed to the coolant channels and after removing heat combines at Reactor Outlet Header. Due to space constraints the feeder pipes are joined to the channel with one or two elbows close to the end fittings of the coolant channels. The carbon steel feeder pipes carry high temperature fluid at higher velocity and are liable to undergo Flow Accelerated Corrosion (FAC). In the recent inspection it has been found that feeders having double elbow are more susceptible to FAC on the intrados of second elbow. But it was found that in some of the elbows maximum thinning due to FAC was observed on the intrados of the first elbow. Hence to resolve this, effect of first bend orientation with respect of upstream direction has been studied. Two different approaches are used for predicting the FAC rate from calculated value of wall shear stress by CFD. One method is based on evaluating of wear rate using Colburn analogy and the other using an empirical equation between wear rate and shear stress. In Colburn analogy, mass transfer coefficient is evaluated by knowing shear stress and equilibrium concentration. For a case study, wall shear stress obtained from k-∊ turbulence model was compared with k-ω SST turbulence model and no appreciable change in the wall shear stress has been found. Hence for subsequent analysis k-∊ turbulence model was chosen because large mesh size near to the surface (first layer thickness) is permitted due to higher y+ value.
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Khan S, Verma V, Verma S, Polzer S, Jha S. Assessing the potential risk of rupture of abdominal aortic aneurysms. Clin Radiol 2014; 70:11-20. [PMID: 25544065 DOI: 10.1016/j.crad.2014.09.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2014] [Revised: 09/02/2014] [Accepted: 09/09/2014] [Indexed: 10/24/2022]
Abstract
Abdominal aortic aneurysms (AAAs) involve complex interplays between inflammatory and biomechanical factors that can be elucidated with anatomical and functional imaging. Although AAA size has been well-established in the literature to correlate with risk of rupture (and subsequent need for vascular intervention), there are other less-well-known characteristics about AAAs that also contribute to higher risk of rupture. This review focuses on biomechanical, radiological, and epidemiological characteristics of AAAs that are associated with higher rupture risk. For clinicians, knowing and considering a wide variety of risk factors in addition to AAA size is important to initiate early and proper intervention for AAA repair. Although there is no official quantitative risk score of AAA rupture risk that takes other non-size-related variables into account, if clinicians are aware of these other parameters, it is hoped that intervention can be appropriately performed for higher-risk AAAs that have not met the size-threshold for elective repair.
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Srinivas M, Modi D, Patel N, Verma V, Murthy KVR. Photoluminescence Studies and Core–Shell Model Approach for Rare Earthdoped CdWO4 Nano Phosphor. J Inorg Organomet Polym Mater 2014. [DOI: 10.1007/s10904-014-0065-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Thangamani I, Dutta A, Shanware VM, Verma V, Singh RK. Analysis of the CSF model for simulated loss of coolant accident conditions. KERNTECHNIK 2014. [DOI: 10.3139/124.110405] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
An experimental facility called Containment Studies Facility (CSF) has been constructed at the Bhabha Atomic Research Centre (BARC) for the purpose of research and development in the area of nuclear reactor containment thermal hydraulics. The facility consists of reinforced concrete containment structural model (CM) and a Primary Heat Transport Model (PHTM) vessel. The containment model of CSF is divided into high enthalpy V1 volume (dry well) and low enthalpy V2 volume (wet well). The PHTM and associated pump and piping system is designed for simulating the Loss of Coolant Accident (LOCA) conditions within the containment model. Experiments were carried out in CSF for 30 bar and 50 bar blowdown conditions. Pressure, temperature and other transient parameters were recorded. The experimental results were compared with outputs of modeling carried out using RELAP code and in-house containment thermal hydraulic code CONTRAN.
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Prateek S, Banerjee G, Gupta P, Singh M, Goel MM, Verma V. Fungal rhinosinusitis: a prospective study in a University hospital of Uttar Pradesh. Indian J Med Microbiol 2014; 31:266-9. [PMID: 23883713 DOI: 10.4103/0255-0857.115634] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND To assess the purpose of fungal rhinosinusitis in a University hospital and to correlate histopathological findings with culture results for accurate clinical classification of the disease. MATERIALS AND METHODS One-hundred suspected patients were included in the study. Data was collected in a brief predetermined format. Samples like nasal lavages, sinus secretions, and tissue specimens were processed and examined by microbiology culture using recommended techniques. Slide culture was done to observe the microscopic morphology. Histopathological examination was done by H and E stain and PAS stain for classification. RESULTS Out of 100 cases of rhinosinusitis, 21 cases were culture-positive for fungal rhinosinusitis. On the basis of histopathological findings, 14 cases (66.67%) were found to be of non-invasive fungal rhinosinusitis. Aspergillus flavus was the most common fungal isolate. CONCLUSION Mycological profile of rhinosinusitis in Lucknow was thus evaluated. Histopathological and microbiological findings reported 21 cases of fungal rhinosinusitis among 100 suspected cases of rhinosinusitis.
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Koul S, Verma V, Johri S, Qazi GN. Physical characterization of a glucose-dehydrogenase-bearing plasmid from ketoacid-producingErwinia herbicola. World J Microbiol Biotechnol 2014; 11:234-5. [PMID: 24414511 DOI: 10.1007/bf00704657] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Revised: 09/07/1994] [Accepted: 09/09/1994] [Indexed: 11/30/2022]
Abstract
Erwinia herbicola (ATCC 21998), a facultative anaerobe, has two plasmids: pVQ1 and pVQ2. Curing with mitomycin C indicated that pVQ2 was cryptic but pVQ1, a 7.4-kb plasmid, bears a 4.3SacI fragment which strongly hybridized to the C-terminal region of the glucose dehydrogenase gene ofAcinetobacter calcoaceticus. A restriction map of plasmid pVQ1 is presented.
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Abstract
Abstract
High Level Liquid Radioactive Waste (HLLRW) produced during reprocessing of spent fuel from nuclear reactors is encased in the canisters after vitrification. The vitrified waste has high heat generation rate due to decay heat and needs interim storage under surveillance. The waste needs to be cooled continuously until major portion of the decay heat is dissipated. Natural circulation air cooling has been considered to cool the canisters. Canisters are placed in a storage vault and cooled by induced axial flow of air with the help of stack. The capacity of storage vault for Vitrified Waste Storage Block (VWSB) Facility proposed at Integrated Plant-1, Tarapur is designed for interim storage of waste generated of 30 yrs of IP1 plant operation. Canister and concrete temperature should be within the prescribed limit. Parametric studies have been carried out for the relevant parameters such as stack and duct dimensions, plenum height etc. Details canister temperature have been obtained using CFD code CFD-ACE+. Axial and radial temperature variation in the canisters, thimble and ventilation pipe have been evaluated in a location. Effect of natural convection (in air) within the canister and between thimble and canister is also studied. It was found that canister centerline temperature reduces by 20°C.
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Khanna PK, Kumar A, Chandra R, Verma V. Germination behaviour of seeds of Withania somnifera (L.) Dunal: a high value medicinal plant. PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS : AN INTERNATIONAL JOURNAL OF FUNCTIONAL PLANT BIOLOGY 2013; 19:449-54. [PMID: 24431513 PMCID: PMC3715647 DOI: 10.1007/s12298-013-0169-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
In order to evolve a quick method for smooth and optimum germination for Withania somnifera- a medicinally efficacious multipurpose plant, present investigation was carried to study the effect of physico-chemical treatments, storage, temperature, photoperiod and growth regulators (GA3, IAA, IBA, 2-4 D and BA) on germinability. The most effective treatment is GA3 at 150 μg/ml concentration at 25 °C. The optimal temperature for germination is 25 °C and continuous light favored germination showing that photoperiod has a significant role. The seedlings derived from seeds performed well when grown in a glasshouse. The data have implications for conservation and cultivation of the species studied.
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Tripathi R, Chugh DK, Verma V, Mala Y. Fatal methotrexate toxicity: could it have been avoided? CASE REPORTS 2013; 2013:bcr-2012-008000. [DOI: 10.1136/bcr-2012-008000] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Thangamani I, Gera B, Dutta A, Verma V, Singh RK, Ghosh AK. Preliminary evaluation of effect of Engineered Safety Features on source term for AHWR containment. KERNTECHNIK 2013. [DOI: 10.3139/124.110163] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
The proposed Advanced Heavy Water Reactor (AHWR) employs double containment envelope along with many Engineered Safety Features (ESFs) to mitigate the consequences of Loss-of-Coolant Accidents (LOCA) with safety system failure, during which high enthalpy steam and radioactive fission products will be discharged into the containment. In such conditions, the pressurized containment will be the source of activity release to the environment by way of leakage. It is required to study the effect of ESFs on the source term from the AHWR containment. An analysis was performed to evaluate the release rate from the AHWR containment during a postulated accident with the in-house containment code CONTRAN and the aerosol behavior code NAUA5-M in a coupled way. Modules for simulating the engineered safety features were incorporated in the CONTRAN code and the aerosol transport behaviour was evaluated using NAUA5-M separately. The AHWR containment is divided into three nodal volumes interconnected by junctions. The blow down mass, energy discharge data and activity released into the containment from the reactor core, for a postulated LOCA case of 200% RIH break with failure of shutdown systems (1 & 2), are inputs to the CONTRAN code. Thermodynamic parameters like containment gas temperature, partial pressure of steam, air in the subdivided volumes along with the flow rates through junctions obtained from CONTRAN were supplied to NAUA5-M. An analysis was carried out for a number of cases, postulated based on availability/unavailability of ESFs. Pressure, temperature and activity concentration transients were evaluated, for 72 h, in the subdivided volumes along with the activity released out of the containment through leakages and stack discharges for all the cases. This paper highlights the importance of operation of ESF in reducing the activity release to the environment.
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Riyaz-Ul-Hassan S, Verma V, Qazi GN. Real-time PCR-based rapid and culture-independent detection of Salmonella in dairy milk--addressing some core issues. Lett Appl Microbiol 2013; 56:275-82. [PMID: 23347051 DOI: 10.1111/lam.12046] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2012] [Revised: 01/12/2013] [Accepted: 01/16/2013] [Indexed: 11/29/2022]
Abstract
In this study, methodologies were developed for cost-effective, rapid and user-friendly culture-independent detection of Salmonella in milk by real-time PCR. The SYBR Green-based real-time PCR assay was standardized with primers targeting the Salmonella enterotoxin gene (stn) that have been earlier used for its detection by conventional PCR. Inclusivity tests generated the specific amplifications with a Tm corresponding to 81 ± 0·5°C. The specificity of the reaction was evaluated with a panel of 36 non-Salmonella strains. Standard curves generated, with different number of cells of this organism in milk, depicted the detection of five cells with a CT value of 37·17 (SD 0·43). To make the assays user-friendly and suitable for field applications, protocols were also established for the immobilization of the SYBR Green reaction mixes in the reaction tubes. The immobilized master mixes were stable at 25°C for 4 months and at 8°C for over 6 months. Total DNA was prepared from 150 samples of full-fat dairy milk and subjected to real-time PCR detection wherein 31 samples tested positive for Salmonella. The time of analysis was <5 h.
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Verma V, Huang B, Kallingappa PK, Oback B. 279 INNER CELL MASS-DERIVED BOVINE CELL CULTURES MAINTAIN PLURIPOTENCY UNDER CHEMICALLY DEFINED CONDITIONS OF DUAL KINASE INHIBITION. Reprod Fertil Dev 2013. [DOI: 10.1071/rdv25n1ab279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Authentic embryonic pluripotent stem cells (ePSC), capable of giving rise to all cell types of an adult animal, are only available in mouse and rat. Here, we report the generation of bovine ePSC-like cells under minimal conditions. Inner cell masses were immunosurgically isolated from IVF bovine blastocysts and explanted on laminin/gelatine-coated substrates. Explants were cultured feeder-free under low oxygen (7%) in a chemically defined medium containing inhibitors of mitogen-activated protein kinase kinase (MAPKK) and glycogen synthase kinase-3 signalling (GSK3). Dual kinase inhibition (2i) was necessary to sustain expression of epiblast-specific pluripotency markers SOX2 and NANOG in the central colony, which comprised a multi-layered clump of tightly packed cells that was clearly demarcated from the surrounding monolayer outgrowth. In 2i, explanted inner cell mass (ICM) expanded from 51 ± 4 to 1102 ± 55 cells per colony and surrounding outgrowth within 6 days of culture, equivalent to ~4 to 5 population doublings, before passaging. Moreover, 2i suppressed apoptosis after mechanical passaging and the cell number per colony and outgrowth remained constant for up to 8 passages every 4 to 5 days, after which cultures were discontinued. As a proxy for cell proliferation, we quantified DNA synthesis following different 5-ethynyl-2′-deoxyuridine (EdU)-incorporation protocols. EdU pulse-labelling for 30 min revealed that in steady state, 20 to 30% of cells were in S-phase in primary and passaged colonies, respectively. After cumulative labelling for 24 h, almost all primary and passaged cells were cycling. Throughout this passaging regime, ICM-derived cell lines expressed a repertoire of core pluripotency-related factors (CDH1, OCT4, SALL4, SOX2, TCF3), including markers enriched in naïve pluripotent cells (DPPA3, KLF4, LIN28, NANOG, SOCS3, STAT3) and primordial germ cells (IIFITM3). Genes that are downregulated in primed pluripotent cells were either undetectable (FGF5, T-BRACHYURY) or downregulated (LEFTY) after passaging. These mRNA results were confirmed on the protein level, where OCT4, KLF4, SOX2, and NANOG, as well as SSEA-3/4 and TRA-1-60/-81, but not SSEA-1, remained widely expressed. A diagnostic feature of murine ePSC is the simultaneous presence of 2 active X chromosomes (Xa Xa) and OCT4. We derived cultures from ICM of female blastocysts, produced through IVF with sexed semen, and stained primary cultures on Day 6 with an antibody against trimethylated histone (H) 3 lysine (K) 27 (H3K27me3). Nuclear foci of intense H3K27me3 immunoreactivity were absent in most OCT4-positive cells (660/724 = 92%), indicating presence of Xa Xa. In suspension culture, bovine ePSC-like cells formed cystic embryoid bodies expressing ectoderm (TUBB3, GFAP, NES), endoderm (AFP), and mesoderm (SPP1) markers. Bovine ePSC-like cells after 3 passages showed a normal chromosome number in the majority of spreads (17/18 = 94%). Our short-term culture system provides a chemically defined screening platform for factors that maintain long-term proliferation and pluripotency of ePSC in cattle.
Supported by MSI C10X1002.
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Tripathi R, Tyagi S, Mala Y, Singh N, Singh C, Verma V. O699 BODY MASS INDEX (BMI) ESTIMATION AT ANTENATAL BOOKING IN SECOND TRIMESTER AS A PREDICTOR OF PREGNANCY OUTCOME. Int J Gynaecol Obstet 2012. [DOI: 10.1016/s0020-7292(12)61129-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Tripathi R, Mala Y, Tyagi S, Verma V, Kaushik S, Ramji S. W195 SEVERE ANEMIA DURING PREGNANCY: A PILOT STUDY FROM INDIA CORRELATING CLINICAL PICTURE WITH ANALYSIS OF MATERNAL AND CORD BLOOD PARAMETERS. Int J Gynaecol Obstet 2012. [DOI: 10.1016/s0020-7292(12)61920-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Desplantez T, Verma V, Leybaert L, Evans WH, Weingart R. Gap26, a connexin mimetic peptide, inhibits currents carried by connexin43 hemichannels and gap junction channels. Pharmacol Res 2012; 65:546-52. [PMID: 22406236 DOI: 10.1016/j.phrs.2012.02.002] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2011] [Revised: 02/06/2012] [Accepted: 02/13/2012] [Indexed: 10/28/2022]
Abstract
Connexin mimetic peptides corresponding to short conserved extracellular loop sequences of connexins have been used widely as reversible inhibitors of gap junctional intercellular communication. These peptides also block movement of ATP and Ca(2+) across connexin hemichannels, i.e. hexameric channels yet to dock with partners in aligned cells and to generate the gap junction cell-cell conduit. By means of electrophysiology, we compared the effects of Gap26, a mimetic peptide corresponding to a short linear sequence in the first extracellular loop of connexin43, on connexin channel function in HeLa cells expressing connexin43. We demonstrate that Gap26 inhibited electrical coupling in cell pairs mediated by gap junctions after exposure for 30min. In contrast, Gap26 applied to single cells, inhibited hemichannel currents evoked in low Ca(2+) solution with a response time of less than 5min. The results further support the view that the likely primary and direct inhibitory effect of Gap26 is on connexin hemichannels, with gap junctions becoming inhibited later. The mechanism of action of Gap26 in blocking hemichannels and gap junction channels is discussed in the context of their different functions and locations.
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Prasad MH, Gera B, Thangamani I, Rastogi R, Gopika V, Verma V, Mukhopadhyay D, Bhasin V, Chatterjee B, Sanyasi Rao V, Lele H, Ghosh A. Level-1, -2 and -3 PSA for AHWR. NUCLEAR ENGINEERING AND DESIGN 2011. [DOI: 10.1016/j.nucengdes.2011.05.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Gotlieb V, Verma V, Fogel J, Multz A, Gralla RJ. Comparative analysis of lung cancer in a public hospital versus private hospitals in New York. J Clin Oncol 2011; 29:6037-6037. [DOI: https:/doi.org/10.1200/jco.2011.29.15_suppl.6037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2024] Open
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Gotlieb V, Verma V, Fogel J, Multz A, Gralla RJ. Comparative analysis of lung cancer in a public hospital versus private hospitals in New York. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.6037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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85
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Rehman S, Shawl AS, Kour A, Andrabi R, Sudan P, Sultan P, Verma V, Qazi GN. An endophytic Neurospora sp. from Nothapodytes foetida producing camptothecin. APPL BIOCHEM MICRO+ 2011. [DOI: 10.1134/s0003683808020130] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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86
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Shukla PJ, Barreto SG, Bedi MMS, Bheerappa N, Chaudhary A, Gandhi MD, Jacob M, Jesvanth S, Kannan DG, Kapoor VK, Kumar A, Maudar KK, Ramesh H, Sastry RA, Saxena R, Sewkani A, Sharma S, Shrikhande SV, Singh A, Singh RK, Surendran R, Varshney S, Verma V, Vimalraj V. Peri-operative outcomes for pancreatoduodenectomy in India: a multi-centric study. HPB (Oxford) 2009; 11:638-44. [PMID: 20495631 PMCID: PMC2799616 DOI: 10.1111/j.1477-2574.2009.00105.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2009] [Accepted: 06/16/2009] [Indexed: 12/12/2022]
Abstract
BACKGROUND There have been an increasing number of reports world-wide relating improved outcomes after pancreatic resections to high volumes thereby supporting the idea of centralization of pancreatic resectional surgery. To date there has been no collective attempt from India at addressing this issue. This cohort study analysed peri-operative outcomes after pancreatoduodenectomy (PD) at seven major Indian centres. MATERIALS AND METHODS Between January 2005 and December 2007, retrospective data on PDs, including intra-operative and post-operative factors, were obtained from seven major centres for pancreatic surgery in India. RESULTS Between January 2005 and December 2007, a total of 718 PDs were performed in India at the seven centres. The median number of PDs performed per year was 34 (range 9-54). The median number of PDs per surgeon per year was 16 (range 7-38). Ninety-four per cent of surgeries were performed for suspected malignancy in the pancreatic head and periampullary region. The median mortality rate per centre was four (range 2-5%). Wound infections were the commonest complication with a median incidence per centre of 18% (range 9.3-32.2%), and the median post-operative duration of hospital stay was 16 days (range 4-100 days). CONCLUSIONS This is the first multi-centric report of peri-operative outcomes of PD from India. The results from these specialist centers are very acceptable, and appear to support the thrust towards centralization.
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Verma V, Arankalle VA. Hepatitis E virus-based evaluation of a virion concentration method and detection of enteric viruses in environmental samples by multiplex nested RT-PCR. J Appl Microbiol 2009; 108:1630-41. [PMID: 19878363 DOI: 10.1111/j.1365-2672.2009.04581.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
AIMS The prevalence of enteric viruses in drinking and river water samples collected from Pune, India was assessed. During an outbreak of HEV in a small town near pune, water samples were screened for enteric viruses. METHODS AND RESULTS The water samples were subjected to adsorption-elution-based virus concentration protocol followed by multiplex nested PCR. Among 64 Mutha river samples, 49 (76.56%) were positive for Hepatitis A Virus, 36 (56.25%) were positive for Rotavirus, 33 (51.56%) were positive for Enterovirus and 16 (25%) were positive for Hepatitis E Virus RNA. Only enterovirus RNA was detected in 2/662 (0.3%) drinking water samples, and the samples from the city's water reservoir tested negative for all four viruses. HEV RNA was detected in three out of four river water samples during HEV outbreak and partial sequences from patients and water sample were identical. CONCLUSIONS The study suggests absence of enteric viruses both in the source and in the purified water samples from Pune city, not allowing evaluation of the purification system and documents high prevalence of enteric viruses in river water, posing threat to the community. SIGNIFICANCE AND IMPACT OF THE STUDY The rapid, sensitive and relatively inexpensive protocol developed for virological evaluation of water seems extremely useful and should be adapted for evaluating viral contamination of water for human consumption. This will lead to development of adequate control measures thereby reducing disease burden because of enteric viruses.
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Verma V, Harjai K, Chhibber S. Restricting ciprofloxacin-induced resistant variant formation in biofilm of Klebsiella pneumoniae B5055 by complementary bacteriophage treatment. J Antimicrob Chemother 2009; 64:1212-8. [DOI: 10.1093/jac/dkp360] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Abstract
e17059 Background: Head and neck cancer in India has unique demographic profile, environmental exposure, dietary habits, and personal and family history. Methods: 1,000 cases were analysed. Results: Males dominated (82%) in fifth (29%) and sixth (33%) decades. Majority was uneducated (76%) and poor. Passive tobacco smoking was seen in-house (85%) as well as in the work-place (80%). Approximately 69% smoked more than 100 cigarettes/bidis in their lifetime. Majority acquired regular smoking habit in second (73%) and third (18%) decades and continued smoking for more than 20 years (66%) with 10–20 cigarettes daily (range 1 to 43). However 30% never used tobacco. The main alternative forms were bidi (27%) and smokeless-tobacco chewing products (47%). A past history of cancer and the subsequent radiation treatment was found in 3% while GERD in 33%. Multivitamins/minerals for chemoprevention was used in 65% for 1 to 12 months. Alcohol consumption was seen in 26% where the age of initiation was in second and third decade and the total years of consumption mainly varied from 10–30 years. Having a predominant agriculture-based-economy, the majority of males (38%) were farmers with significant exposure to pesticides and fertilizers; while females predominantly housewifes (17%). The family history was appreciated in 1% with natural parents known in all. The most common sites involved were oral cavity (28%), oropharynx (30%), and larynx (32%). Majority presented with advanced stage (III = 39%; IV = 23%). The consumption of fruit and vegetable juice was less common as compared to fresh consumption as such. Green salads, potatoes, and fiber cereals were significantly used (4–6 times a week). Beans, peas, and corn was not common while beef and pork consumption rare owing . The ‘staple’ diet was wheat, rice, pulses with additional meat mainly in Muslims (once a day). The use of cooking oil, butter, eggs biscuits, cheese, cakes, and cookies was uncommon (less than once a week), but milk was abundant. Conclusions: Hence, it seems that poor, education/literacy, poor socioeconomic status, tobacco smoking (passive and active) at an early age for prolonged duration, tobacco-related products and exposure to pesticides/fertilizers predispose Indian population for head and neck cancer, rather than a positive family history, dietary factors, radiation exposure, or alcoholism. No significant financial relationships to disclose.
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Ghai A, Wadhera R, Kamal K, Verma V. Mediastinitis after oesophagoscopy: A case report. SOUTHERN AFRICAN JOURNAL OF ANAESTHESIA AND ANALGESIA 2009. [DOI: 10.1080/22201173.2009.10872604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Singh B, Chauhan MS, Singla SK, Gautam SK, Verma V, Manik RS, Singh AK, Sodhi M, Mukesh M. Reproductive biotechniques in buffaloes (Bubalus bubalis): status, prospects and challenges. Reprod Fertil Dev 2009; 21:499-510. [DOI: 10.1071/rd08172] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2008] [Accepted: 12/24/2008] [Indexed: 11/23/2022] Open
Abstract
The swamp buffalo holds tremendous potential in the livestock sector in Asian and Mediterranean countries. Current needs are the faster multiplication of superior genotypes and the conservation of endangered buffalo breeds. Recent advances in assisted reproductive technologies, including in vitro embryo production methodologies, offer enormous opportunities to not only improve productivity, but also to use buffaloes to produce novel products for applications to human health and nutrition. The use of molecular genomics will undoubtedly advance these technologies for their large-scale application and resolve the key problems currently associated with advanced reproductive techniques, such as animal cloning, stem cell technology and transgenesis. Preliminary success in the application of modern reproductive technologies warrants further research at the cellular and molecular levels before their commercial exploitation in buffalo breeding programmes.
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Little NJ, Verma V, Fernando C, Elliott DS, Khaleel A. A prospective trial comparing the Holland nail with the dynamic hip screw in the treatment of intertrochanteric fractures of the hip. ACTA ACUST UNITED AC 2008; 90:1073-8. [PMID: 18669966 DOI: 10.1302/0301-620x.90b8.20825] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
We compared the outcome of patients treated for an intertrochanteric fracture of the femoral neck with a locked, long intramedullary nail with those treated with a dynamic hip screw (DHS) in a prospective randomised study. Each patient who presented with an extra-capsular hip fracture was randomised to operative stabilisation with either a long intramedullary Holland nail or a DHS. We treated 92 patients with a Holland nail and 98 with a DHS. Pre-operative variables included the Mini Mental test score, patient mobility, fracture pattern and American Society of Anesthesiologists grading. Peri-operative variables were anaesthetic time, operating time, radiation time and blood loss. Post-operative variables were time to mobilising with a frame, wound infection, time to discharge, time to fracture union, and mortality. We found no significant difference in the pre-operative variables. The mean anaesthetic and operation times were shorter in the DHS group than in the Holland nail group (29.7 vs 40.4 minutes, p < 0.001; and 40.3 vs 54 minutes, p < 0.001, respectively). There was an increased mean blood loss within the DHS group versus the Holland nail group (160 ml vs 78 ml, respectively, p < 0.001). The mean time to mobilisation with a frame was shorter in the Holland nail group (DHS 4.3 days, Holland nail 3.6 days, p = 0.012). More patients needed a post-operative blood transfusion in the DHS group (23 vs seven, p = 0.003) and the mean radiation time was shorter in this group (DHS 0.9 minutes vs Holland nail 1.56 minutes, p < 0.001). The screw of the DHS cut out in two patients, one of whom underwent revision to a Holland nail. There were no revisions in the Holland nail group. All fractures in both groups were united when followed up after one year. We conclude that the DHS can be implanted more quickly and with less exposure to radiation than the Holland nail. However, the resultant blood loss and need for transfusion is greater. The Holland nail allows patients to mobilise faster and to a greater extent. We have therefore adopted the Holland nail as our preferred method of treating intertrochanteric fractures of the hip.
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Gautam SK, Verma V, Palta P, Chauhan MS, Manik RS. Effect of type of cryoprotectant on morphology and developmental competence of in vitro-matured buffalo (Bubalus bubalis) oocytes subjected to slow freezing or vitrification. Reprod Fertil Dev 2008; 20:490-6. [PMID: 18462611 DOI: 10.1071/rd07203] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2007] [Accepted: 02/04/2008] [Indexed: 11/23/2022] Open
Abstract
The present study examined the effects of different cryoprotectants on morphology and developmental competence of in vitro-matured buffalo oocytes after slow freezing or vitrification. After slow freezing in dimethyl sulfoxide (DMSO), ethylene glycol (EG) or 1,2-propanediol (PROH), at 1.0 or 1.5 m each, the proportion of morphologically normal oocytes recovered was significantly higher (P < 0.05) with 1.5 than 1.0 m for all cryoprotectants and was highest (P < 0.05) for 1.5 m DMSO. Following vitrification, the percentage of morphologically normal oocytes recovered was lower (P < 0.01) for 40% EG than for 40% DMSO, 20% EG + 20% DMSO or 20% EG + 20% PROH. The most common damage, irrespective of the cryopreservation method, was loss of cumulus mass. The cleavage rate and the proportion of vitrified-warmed oocytes that developed to morulae/blastocysts were significantly higher (P < 0.01) for 20% EG + 20% DMSO than for the other groups. A higher proportion of oocytes developed to morulae (11.5% v. 4.3%) or blastocysts (5.4% v. 0.6%) after vitrification in 20% EG + 20% DMSO than after slow freezing in 1.5 m DMSO. In conclusion, vitrification was more effective than slow freezing for the cryopreservation of in vitro-matured buffalo oocytes.
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Verma V, Dhar A, Chinnery PF. Occult gastro-intestinal cause of spastic paresis of the legs. Gut 2008; 57:1064, 1080. [PMID: 18628374 DOI: 10.1136/gut.2007.127647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/08/2022]
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Verma V, Gond S, Mishra A, Kumar A, Kharwar R. Selection of Natural Strains of Fungal Endophytes from Azadirachta indica A. Juss, with Anti-Microbial Activity Against Dermatophytes. ACTA ACUST UNITED AC 2008. [DOI: 10.2174/157340708784533401] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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96
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Gautam SK, Verma V, Singh B, Palta P, Singla SK, Chauhan MS, Manik RS. Effect of slow freezing on morphology and developmental competence of buffalo (Bubalus bubalis) immature oocytes. Anim Reprod Sci 2008; 105:311-8. [PMID: 17449204 DOI: 10.1016/j.anireprosci.2007.03.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2006] [Revised: 03/08/2007] [Accepted: 03/23/2007] [Indexed: 10/23/2022]
Abstract
The present study was conducted to evaluate the effects of three cryoprotectants, dimethyl sulphoxide (DMSO), ethylene glycol (EG) and 1,2-propanediol (PROH), each used at two concentrations (1.0 and 1.5 M) on the morphology, maturation rate and developmental capacity of usable quality immature buffalo oocytes subjected to slow freezing. The addition of the cryoprotectant before freezing and its dilution after thawing were carried out in a two- (for 1.0 M) or three-step manner (for 1.5 M). The incidence of damage was found to be significantly higher (P<0.05) with the lower concentration of 1.0 M, compared to that with 1.5 M for all the three cryoprotectants examined. The proportion of immature oocytes recovered in a morphologically normal state was significantly higher (P<0.05) for DMSO than those for EG or PROH at both 1.0 and 1.5 M concentrations. Among the six combinations evaluated, that of DMSO at 1.5 M concentration was found to be superior to others. Irrespective of the type or concentration of the cryoprotectant, partial or complete loss of the cumulus mass was the most prevalent damage. Following in vitro maturation, the nuclear maturation rate was significantly higher (P<0.05) for DMSO than those for EG or PROH at both 1.0 and 1.5 M concentrations. When the in vitro matured oocytes were subjected to in vitro fertilization after slow freezing, using 1.5 M DMSO as cryoprotectant, 4.5% and 0.6% of them were able to develop to morulae and blastocysts, respectively, on Day 9 post insemination, compared to 19.2% and 10.6%, respectively, for the controls. In conclusion, DMSO was more effective than EG or PROH for the slow freezing of immature buffalo oocytes and blastocysts could be produced from immature buffalo oocytes subjected to slow freezing in 1.5 M DMSO.
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Verma V, Gautam S, Palta P, Manik R, Singla S, Chauhan M. Development of a pronuclear DNA microinjection technique for production of green fluorescent protein-expressing bubaline (Bubalus bubalis) embryos. Theriogenology 2008; 69:655-65. [DOI: 10.1016/j.theriogenology.2007.09.035] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2007] [Revised: 08/22/2007] [Accepted: 09/15/2007] [Indexed: 11/30/2022]
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Soror SH, Verma V, Rao R, Rasool S, Koul S, Qazi GN, Cullum J. A cold-active esterase of Streptomyces coelicolor A3(2): from genome sequence to enzyme activity. J Ind Microbiol Biotechnol 2008; 34:525-31. [PMID: 17554575 DOI: 10.1007/s10295-007-0224-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2006] [Accepted: 05/04/2007] [Indexed: 11/29/2022]
Abstract
The genome sequence of Streptomyces coelicolor A3(2) contains 51 putative lipase and esterase genes mostly of unknown function. The gene estB (locus SCO 6966) was expressed as a His-tagged protein in E. coli. Esterase B was active at low temperatures exerting its maximum activity at 30 degrees C and retaining more than 25% of its activity at 4 degrees C. The optimum pH was 8-8.5. The enzyme was active against short synthetic p-nitrophenylesters (C2-C10) with maximum activity towards the acetate ester (C2). The esterase was tested on 13 series of racemic esters of potential interest for the synthesis of chiral pharmaceutical compounds. 4 of the series were substrates and a modest degree of enantioselectivity was observed (enantiomeric ratios of 1.1-1.9).
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Rehman S, Shawl AS, Verma V, Kour A, Athar M, Andrabi R, Sultan P, Qazi GN. An endophytic Neurospora sp. from Nothapodytes foetida producing camptothecin. PRIKLADNAIA BIOKHIMIIA I MIKROBIOLOGIIA 2008; 44:225-231. [PMID: 18669267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The medicinal plant, Nothapodytes foetida contains a number of important alkaloids like camptothecin (an anticancer drug molecule) but its concentration is less to meet the existing demand of this important molecule, so in an effort for accessible availability of camptothecin. An endophyte (designated ZP5SE) was isolated from the seed of Nothapodytes foetida and was examined as potential source of anticancer drug lead compound i.e. camptothecin, when grown in Sabouraud liquid culture media under shake flask conditions. The presence of anticancer compound (camptothecin) in this fungus was confirmed by chromatographic and spectroscopic methods in comparison with authentic camptothecin. Isolated endophyte (Neurospora crassa) producing camptothecin may become an easily accessible source for the production of precursor anticancer drug molecule in future at large scale.
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Verma V, Schwarz R. P164. J Surg Res 2007. [DOI: 10.1016/j.jss.2006.12.500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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