Browsing by Author "Sharma, D R"

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    Cisplatin-based chemotherapy: Add high-frequency audiometry in the regimen.
    (2009-10) Arora, R; Thakur, J S; Azad, R K; Mohindroo, N K; Sharma, D R; Seam, R K
    Background : Cisplatin-induced ototoxicity shows high interindividual variability and is often accompanied by transient or permanent tinnitus. It is not possible to identify the susceptible individuals before commencement of the treatment. We conducted a prospective, randomized and observational study in a tertiary care centre and evaluated the effects of different doses of cisplatin on hearing. Materials and Methods : Fifty-seven patients scheduled for cisplatin-based chemotherapy were included in the study. All patients were divided into three groups depending on the dose of cisplatin infused in 3 weeks. Results : The subjective hearing loss was found in seven patients, while six patients had tinnitus during the chemotherapy. The hearing loss was sensorineural, dose dependent, symmetrical, bilateral and irreversible. Higher frequencies were first to be affected in cisplatin chemotherapy. Conclusion : As use of high-frequency audiometry is still limited in research work only, we need a strict protocol of adding high-frequency audiometry in the cisplatin-based chemotherapy regimen.
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    Cyclosporin A monotherapy in young Indian aplastic anaemia patients.
    (1999-12-19) Varma, S; Varma, N; Malhotra, P; Singh, S; Sharma, D R
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    Distinguishing clonal apple rootstocks by isozymes banding patterns.
    (2001-11-22) Kaushal, K; Modgil, M; Sharma, D R
    Molecular characterisation of clonal apple rootstocks using isozymes was carried out to identify isozyme polymorphism in seven clonal apple rootstocks and to identify the most characteristic and stable enzyme markers for each individual rootstock. Five enzyme systems were studied out of which polyphenol oxidase, malate dehydrogenase, acid phosphatase and peroxidase were useful in discriminating among the rootstocks. The peroxidase enzyme system showed maximum variation and esterase showed the least variation among the rootstocks. Out of seven rootstocks, three were distinguished on the basis of one enzyme system only (M.3 with MDH or PER, M.7 with PPO or PER and MM. 111 with MDH). Out of the sixteen loci studied seven were found to be polymorphic. Genetic variation among the rootstocks was explained on the basis of various parameters. The percentage of polymorphic loci varied from 13.33 to 35.71 per cent.
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    Evaluation of kidney functions and cyclosporine levels in renal transplant patients on Panimum Bioral in post transplant period.
    (1999-05-01) Sharma, D R; Singh, S
    A retrospective analysis of the patients being given Panimun Bioral (microemulsion cyclosporine) after renal transplantation was done at IKRDC, (Institute of Kidney Diseases & Research Centre), Ahmedabad. A total of 21 patients were included for analysis. Patients were evaluated for various parameters e.g. weight, cyclosporine levels, S. Creatinine and BUN at three time schedules as 0 to > or = 30 days, > 30 to > or = 60 days and > 60 to 120 days after renal transplantation. The analysis of data obtained indicates the kidney function tests improved in these patients and therapeutically safe blood cyclosporine levels were achieved in all the three timeschedules.
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    Evaluation of prochlorperazine buccal tablets (Bukatel) and metoclopramide oral tablets in the treatment of acute emesis.
    (1999-08-22) Singh, S; Sharma, D R; Chaudhary, A
    The dizziness associated with vertiginous disorders is often accompanied with nausea and/or vomiting. Antiemetic effect of prochlorperazine (PCZ) is diminished by its low bioavailability owing to a significant gastric and hepatic first pass effect. This effect could be further diminished by likelihood of regurgitation of nauseating patients further limiting the therapeutic effect of oral PCZ. A buccal preparation achieves higher plasma concentrations through direct systemic absorption. In this study buccal prochlorperazine (Bukatel) was compared for its efficacy and tolerability with commonly used metoclopramide. Bukatel was well tolerated and well rated by both patients and investigators with no adverse effects on buccal mucosa and causing less drowsiness and sedation. Results indicate that Bukatel is safe and effective for the treatment of nausea and/or vomiting in patients suffering from vertiginous disorders and could be safely and strongly recommended as an alternative to less bioavailable and indiscriminately used oral metoclopramide tablets.
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    Genetic transformation of Robinia pseudoacacia by Agrobacterium tumefaciens.
    (2003-02-17) Kanwar, Kamlesh; Bhardwaj, Anju; Agarwal, Sandhya; Sharma, D R
    Transgenic Robinia pseudoacacia plants were obtained by Agrobacterium tumefaciens mediated gene transfer. Agrobacterium strain LBA4404 harbouring a binary vector that contained the chimeric neomycin phosphotransferase II (NPTII) and beta-glucuronidase (GUS) genes was co-cultivated with hypocotyl segments of in vitro raised seedlings of Robinia. Parameters important for high efficiency regeneration and transformation rates included type of explant, pre-conditioning of explants and appropriate length of co-cultivation period with Agrobacterium. A transformation frequency 16.67% was obtained by 48 hr of pre-conditioning followed by 48 hr of co-cultivation. Transformed tissue was selected by the ability to grow on kanamycin containing medium. Successful regeneration was followed after histochemical GUS assay for the detection of transgenic tissue. This transformation procedure has the potential to expand the range of genetic variation in Robinia.
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    Host plant nodule parameters associated with nitrogen fixation efficiency in French bean (Phaseolus vulgaris L) cultivars.
    (2002-03-15) Nath, Amarjit K; Ahmed, Tarannum; Rana, Neerja S; Sharma, D R
    Two cultivars of French bean (Phaseolus vulgaris L.) viz. contender and arka komal were planted in polythene bags containing sand and grown under glasshouse conditions. The nodulation status, shoot/root biomass, activities of several nodule enzymes, total soluble protein and leghaemoglobin contents were monitored over the entire growth period. Allantoinase activity in leaves was measured to monitor the ureide degrading capacity. Significant genotype difference was observed in both the cultivars. All the parameters showed a decline after flowering except uricase, which declined before flowering. Malate dehydrogenase and isocitrate dehydrogenase showed a constant decline throughout the growth period. Degree of decline varied with the genotype for all the parameters. Leghaemoglobin content, PEP carboxylase activity and ureide degrading capacity of leaves did not show an appreciable decline in contender and were significantly higher than in arka komal. These factors can be used to increase nitrogen fixation in French bean.
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    In vitro clonal multiplication of an apple rootstock by culture of shoot apices and axillary buds.
    (2005-06-05) Kaushal, N; Modgil, M; Thakur, M; Sharma, D R
    In vitro clonal multiplication of apple rootstock MM 111 using axillary buds and shoot apices were carried out. Vegetative axillary buds of the size of 0.2-2.0 cm and shoot apices measuring 4 mm in length were initiated to shoot proliferation on MS medium supplemented with BA (0.5 - 1.0 mgl(-1)), GA3(0.5 mgl(-1)), with or without IBA(0.05 - 0.1 mgl(-1)). Small size explants showed less phenol exudation and less contamination. Following establishment phase, the small shoots emerged from explants were subcultured on MS medium supplemented with different combinations and concentrations of growth regulators. BA (1.0 mgl(-1)) and GA3 (0.5 mgl(-1)) combination showed highest multiplication rate (1:5), andcl also produced longer shoots. Two step rooting was done by transferring microcuttings to auxin free solid medium after root initiation in dark on 1/2 strength MS liquid medium containing IBA (0.5 mgl(-1) ). Rooted plantlets were transferred to peat containing paper cups and resulting plants of MM 111 acclimated successfully for transfer to field.
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    In vitro regeneration of Acacia catechu Willd. from callus and mature nodal explants--an improved method.
    (2002-07-25) Thakur, Manisha; Sharma, D R; Kanwar, Kamlesh; Kant, Anil
    Callus was derived from cultured cotyledons on MS medium supplemented with 2,4-D (0.25 mg/l) and NAA (0.25 mg/l). Plantlets were regenerated from the callus and nodal explants on MS medium containing BAP (2.0 mg/l) and Kn (2.0 mg/l), and further multiplied on the same medium. Addition of adenine sulphate (25.0 mg/l), ascorbic acid (20.0 mg/l) and glutamine (150.0 mg/l) in the medium resulted in enhanced axillary branching. Multiple shoots formed after 6 weeks were separated and subcultured in the fresh medium of same composition. For rhizogenesis, microshoots of 2.0-2.5 cm length were dipped in sterilized IAA solution (10 mg/l) for 24 hr followed by transfer to half strength MS medium containing activated charcoal (0.02%) resulting in rooting (75%) within 8 weeks. The rooted plants were transferred to pots containing sterilized soil and sand mixture for hardening and 71% survival was recorded. Fifty true to type plantlets of A. catechu could be obtained within seven months of culture establishment.
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    Invasive aspergillosis involving multiple paranasal sinuses--a case report.
    (2005-07-16) Agarwal, S; Kanga, A; Sharma, V; Sharma, D R; Sharma, M L
    A case of invasive multiple paranasal sinus aspergillosis with bony involvement is reported. A young immunocompetent lady presented with bilateral nasal obstruction due to polyps. Radiologically and histopathologically a fungal cause was kept a possibility, and the diagnosis of Aspegillus fumigatus was established by demonstration of acute angle branching septate hyphae on direct wet mount and repeated isolation in culture. Patient responded favourably to surgical excision of polyps and oral itraconazole post operatively.
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    Partial molecular characterization of some kiwi fruit cultivars by RAPD markers.
    (2002-02-08) Shirkot, Poonam; Sharma, D R; Mohapatra, T; Shirkot, C K
    Molecular variability among seven cultivars of A. deliciosa var. deliciosa was investigated through RAPD markers. Thirty four decamer primers were screened generating polymorphic patterns of amplified DNA for these cultivars. Twenty one selected primers gave clear and reporducible patterns. A total of 430 bands were produced and 29.37% of them were polymorphic. The patterns distinguished between the cultivars and their analysis established an approach to classification within A. deliciosa var. deliciosa based on RAPD markers. The dendrogram clearly differentiated male from female cultivars. While abbot and allison female cultivars were closely related, bruno and abbot female cultivars showed maximum dissimilarity.
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    Production of solasodine by Solanum laciniatum using plant tissue culture technique.
    (2004-10-30) Bhatnagar, Pooja; Bhatnagar, Madhurima; Nath, Amarjit K; Sharma, D R
    Leaf and hypocotyl explants of 15 days old aseptically grown seedlings of Solanum laciniatum were cultured on MS medium supplemented with NAA (2 mg/l) and kinetin (0.5 mg/l) for callus initiation. For maintenance and proliferation of callus MS medium supplemented with 2,4-D (1 mg/l) and kinetin (0.5 mg/l) was used. The growth of the calli derived from hypocotyls increased with time of incubation and remained almost constant after 45 days. The solasodine content in callus culture was maximum after 30 days of incubation. Addition of L-arginine in the medium (50-150 mg/l) increased growth as well as chlorophyll content in the callus culture. The solasodine content also increased up to 1.2 to 1.4 times in these cultures. High frequency shoot regeneration was obtained in MS medium having BA (4 mg/l) and IBA (0.25 mg/l). For shoot multiplication, MS medium having BA (4 mg/l) was used. Shoots rooted on the same medium. Organogenesis promoted solasodine accumulation in the cultures. Regenerated shoots yielded higher solasodine content than undifferentiated as well as organogenic callus. Solasodine contents in the regenerated shoots was found to be 10 times higher than the callus culture and approached towards the field grown plants. Thin layer chromatography revealed the presence of three compounds. The most predominant spot (Rf 0.789) corresponded to the reference solasodine.
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    Relative bioavailability of two brands of ornidazole in twelve healthy volunteers.
    (2002-09-09) Ramamurthy, L; Kulkarni, R D; Chauhan, B L; Sharma, D R; Singh, A
    AIM OF THE STUDY: To determine the bioequivalence of two marketed ornidazole formulations in healthy volunteers. METHODOLOGY: A single dose relative bioavailability of Ornidazole 1.5 g (3 x 500 mg tablets) of test product (Giro, Panacea Biotec Ltd.) and that of standard reference (Dazolic, Sun Pharmaceutical Industries), was investigated in healthy adult males. A total of 12 subjects wee enrolled in the study and investigations consisted of two treatment phases separated by a washout period of seven days. Both treatment phases were of 12 hours durations each. Blood samples were collected at 0, 1, 1.5, 2, 2.5, 3, 4, 6, 8, 10 and 12 hours post-administration of assigned drug product. Appropriate fasting restrictions were employed during both the treatment phases. Drug assay was done using HPTLC method. The statistical significance of difference in pharmacokinetic parameters between preparations was tested using ANOVA. RESULTS: The mean peak plasma concentration (Cmax) of 32.67 +/- 4.45 microg/ml was achieved at 1.54 +/- 0.81 hours following administration of test product as against mean Cmax of 31.55 +/- 5.04 microg/ml at 1.79 +/- 0.89 hours for reference standard. The area under time concentration curve (AUC(0-12)) hours was 261.67 +/- 77 microg/ml hours with reference standard and 265.41 +/- 30.82 microg/ml hours for test product. CONCLUSION: There was no statistically significant difference between the two formulations and the two products
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    A review of absorption characteristics of microemulsion cyclosporine products over the last 2 years in Indian subjects.
    (1999-07-22) Singh, S; Sharma, D R
    Microemulsion based cyclosporine has demonstrated better absorption with laser pharmacokinetic variability. For the clinical use of any new microemulsion based product, bioequivalence testing with existing formulation is necessary. Panimun Bioral (Test) and Sandimmun Neoral (Reference) were evaluated in different transplant centers using both volunteers as well as renal transplant patients. All these centres have reported that both products are bioequivalent. These reports offer the physician an option to convert the patients to the Test product for economic reasons.
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    A review of absorption characteristics of microemulsion cyclosporine products over the last 2 years in Indian subjects.
    (1999-03-01) Singh, S; Sharma, D R
    Microemulsion based cyclosporine has demonstrated better absorption with lesser pharmacokinetic variability. For the clinical use of any new microemulsion based product, bioequivalence testing with existing formulation is necessary. Panimun Bioral (Test) and Sandimmun Neoral (Reference) were evaluated in different transplant centers using both volunteers as well as renal transplant patients. All these centers have reported that both products are bioequivalent. These reports offer the physician an option to convert the patients to the Test product for economic reasons.
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    Serum proteins in children with recurrent pustular eruptions.
    (1966-11-01) Sharma, D R; Verma, S
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    Successful propagation in vitro of apple rootstock MM106 and influence of phloroglucinol.
    (2000-12-20) Sharma, M; Modgil, M; Sharma, D R
    Successful in vitro propagation of clonal apple rootstock MM106 was achieved by culturing axillary buds on MS basal medium with BAP (1 mg/L), GA3 (0.5 mg/L) and IBA (0.1 mg/L). Use of liquid medium (LM) in initial cultures reduced phenol exudation to a greater extent and gave maximum sprouting percentage when transferred to solid MS medium. Phloroglucinol (PG) did not enhance sprouting of buds but increased the rate of multiplication when added in the medium. Maximum number of shoots were obtained when MS medium was supplemented with BAP (0.5 mg/L), GA3 (1 mg/L), IBA (0.1 mg/L) and PG (100 mg/L). For rooting, in vitro regenerated shoots were placed in IBA (30 mg/L) for 3 hr and transferred to solidified auxin free medium. Rooting was recorded in about 80% of shoots. Inclusion of PG in rooting medium was not beneficial but shoot cultures grown in its presence gave higher rooting percentage. Rooted plantlets showed about 70% survival rate in potting mixture of sand:soil:perlite (1:1:1).
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    Suitability of limited sampling strategy to cyclosporine A oral formulation.
    (2000-08-01) Singh, S; Sharma, D R; Singh, A
    Therapeutic drug monitoring of cyclosporine A in renal transplant patients is normally performed by measuring pre-dose trough levels or doing area under the curve profiles from all possible sampling points. On the basis of good correlation between predicted area under the curve from limited sampling points and actual area under the curve (literature survey), a limited sampling strategy at 1, 3 and 5 hr was used and extended this strategy as a criteria for pilot evaluation of modified cyclosporine A formulations. Hemodialysis patients served as subjects for the study. Panimun Bioral was used as a test formulation while Sandimmun Neoral as standard reference. The study revealed that both formulations had similar restricted AUC0-5h profiles.