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RISS 인기검색어
- 검색키워드
- 저자 : Joydeep Mukherjee (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Basu, Kaustuv,Mukherjee, Joydeep,Law, Sujata,Chaudhuri, Samaresh Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.6
Biological response modifiers (BRMs) can alter interactions between the immune system and cancer cells to boost, direct, or restore the body's ability to fight disease. Mice with ethylnitrosourea- (ENU) induced leukemia were here used to monitor the therapeutic efficacy of lipopolysaccaride (LPS), Bacillus Calmette Guerin (BCG) and sheep erythrocytes (SRBC). Flow cytometry based CD34+ positivity analysis, clonogenicity, proliferation and ultrastructure studies using scanning electron microscopy (SEM) of stem cells in ENU induced animals with and without BRMs treatment were performed. BRMs improved the stem-stromal relationship structurally and functionally and might have potential for use as an adjunct in human stem cell therapy.
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Antibiotic Production by a Marine Isolate (MS 310) in An Ultra-low-speed Rotating Disk Bioreactor
Sreyashi Sarkar,Joydeep Mukherjee,Debashis Roy 한국생물공학회 2009 Biotechnology and Bioprocess Engineering Vol.14 No.6
Actinomycin-D production by a biofilm-forming estuarine isolateviz. Streptomyces sp. MS 310 is studied in smallscale shaken cultures, as well as in a 25 L rotating disk bioreactor, (RDBR) which, when operated at a disk rotational speed of 1 revolution/day with 50% disk submergence, mimics the intertidal conditions of the microbe’s niche estuarine habitat- alternating 12 h periods of inundation and exposure. The ideal pH and temperature for antibiotic production are determined (pH 10, 30oC) through a designed experimental study using shaken flasks. Subsequently, operating conditions in the RDBR are investigated employing a 3ⁿ experimental design wherein each of two (n = 2) parameters viz. aeration and disk submergence are considered at three levels viz. high, medium, and low: 9.0, 6.0, and 3.0 L/min for aeration rate; and 75, 50, and 25% for disk submergence, (while maintaining the rotational speed at 1.0 rev/day). The niche-mimic condition along with maximum permissible aeration is found to be most favorable for antibiotic production - peak antibiotic activity (PAA) and peak activity attainment rate (PAAR) simultaneously attaining their highest values: 40 mm and 2.13 mm/h, respectively. Both PAA and PAAR increase with increasing aeration at all operating conditions examined - particularly, at the niche-mimic condition, a threefold increase in aeration rate (3~9 L/min) causes PAA to increase by 33%, whereas PAAR increases by 2.5 times, thus pointing to the strong aeration dependence of this actinomycin-D producer. Again, compared to the best values obtained in the 500 mL shaken flask experiments, corresponding RDBR values are 16% higher for PAA and more than 5 times higher for PAAR - strong evidence for employing these novel bioreactors for cultivation of antibiotic-producer marine microbes Actinomycin-D production by a biofilm-forming estuarine isolateviz. Streptomyces sp. MS 310 is studied in smallscale shaken cultures, as well as in a 25 L rotating disk bioreactor, (RDBR) which, when operated at a disk rotational speed of 1 revolution/day with 50% disk submergence, mimics the intertidal conditions of the microbe’s niche estuarine habitat- alternating 12 h periods of inundation and exposure. The ideal pH and temperature for antibiotic production are determined (pH 10, 30oC) through a designed experimental study using shaken flasks. Subsequently, operating conditions in the RDBR are investigated employing a 3ⁿ experimental design wherein each of two (n = 2) parameters viz. aeration and disk submergence are considered at three levels viz. high, medium, and low: 9.0, 6.0, and 3.0 L/min for aeration rate; and 75, 50, and 25% for disk submergence, (while maintaining the rotational speed at 1.0 rev/day). The niche-mimic condition along with maximum permissible aeration is found to be most favorable for antibiotic production - peak antibiotic activity (PAA) and peak activity attainment rate (PAAR) simultaneously attaining their highest values: 40 mm and 2.13 mm/h, respectively. Both PAA and PAAR increase with increasing aeration at all operating conditions examined - particularly, at the niche-mimic condition, a threefold increase in aeration rate (3~9 L/min) causes PAA to increase by 33%, whereas PAAR increases by 2.5 times, thus pointing to the strong aeration dependence of this actinomycin-D producer. Again, compared to the best values obtained in the 500 mL shaken flask experiments, corresponding RDBR values are 16% higher for PAA and more than 5 times higher for PAAR - strong evidence for employing these novel bioreactors for cultivation of antibiotic-producer marine microbes
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