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Development of standardization parameters of crude drugs used in Ayurvedic Balarista formulation
Chandan Das,Anindya Bose,Subrata Mallick,Debajyoti Das 경희대학교 융합한의과학연구소 2019 Oriental Pharmacy and Experimental Medicine Vol.19 No.4
‘Balarista’ is an important Ayurvedic arista formulation containing twelve crude drugs among which Sida cordifolia and Withania somnifera are the two major drugs. The Ayurvedic Formulary of India mentions various usages of Balarista, but it is mainly used in the treatment of rheumatoid arthritis. This study deals with the evaluation of pharmacognostic and physico-chemical properties of all incorporated drugs along with the HPLC and GC–MS analysis of the two main drugs. The macroscopic, microscopic, powder microscopy and physico-chemical parameters of diferent drugs were assessed according to the Ayurvedic Pharmacopoea of India. The scanning electron microscopic study, fuorescence analysis and powder behavior studies of various drugs in powder form were also carried out. The quantifcation of vasicine and total withanolides were analyzed in chloroform extract of Sida cordifolia and Withania somnifera root by HPLC method. Further, presences of other phytoconstituents were also confrmed by GC–MS analysis. The macroscopical, organoleptic, histological, powder characteristics and scanning electron microscopic images of various drugs revealed the important diagnostic features. The physico-chemical, fuorescence analysis and powder behavior characteristics provided useful tools to diferentiate them from the adulterants. The HPLC analysis detected percentage of vasicine and total withanolide (withanoside IV, withanoside V, withaferin A, 12-Deoxy withastramonolide, withanolide A and withanolide B) in Sida cordifolia and Withania somnifera root respectively. GC–MS analysis identifed ffty bioactive compounds in both the drugs. The pharmacognostical, physicochemical and chromatographic assessment of these medicinally important plant drugs could be helpful for their authentication and in ensuring the quality of Balarista formulation.
MRI-Targeted Prostate Biopsy: What Radiologists Should Know
Das Chandan J,Netaji Arjunlokesh,Razik Abdul,Verma Sadhna 대한영상의학회 2020 Korean Journal of Radiology Vol.21 No.9
Transrectal ultrasound (TRUS)-guided systematic biopsy, the current gold standard for the detection of prostate cancer, suffers from low sensitivity for clinically significant cancer. The use of diagnostic multiparametric MRI has increased the relevance of targeted biopsy techniques such as MRI-TRUS fusion biopsy and direct (in-bore) MRI-guided biopsy, which have higher detection rate for clinically significant cancer. Although primarily used in patients who remain at high clinical suspicion for prostate cancer despite a negative systematic biopsy, with the increasing use of upfront diagnostic MRI, these biopsies are expected to replace routine systematic biopsies. This pictorial essay aims to enhance our understanding of the concepts of these biopsy techniques so that they can be performed safely and provide maximum diagnostic yield.
Mantle Cell Lymphoma: A North Indian Tertiary Care Centre Experience
Das, Chandan Krushna,Gogia, Ajay,Kumar, Lalit,Sharma, Atul,Sharma, Mehar Chand,Mallick, Saumya Ranjan Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.10
Background: Mantle cell lymphoma (MCL) is an aggressive non-Hodgkin's lymphoma, with a pathognomonic chromosomal translocation t (11;14). Prognosis is uniformly dismal but there is a paucity of information on MCL from India. Materials and methods: We retrospectively analysed clinicopathological information on all treated patients with MCL at our centre. STATA 14.0 was used for analysis. Survival was assessed by Kaplan-Meier analysis and the Cox's proportional hazards method. Statistical significance was defined as a P value of < 0.05. Results: Fifty-one patients with MCL were reviewed. The median age at presentation was 57.0 years. Extranodal involvement was seen in 39.0 (74.0%) while bone marrow positivity at presentation was found in 27.0 (54.0%). Initial treatment was chemotherapy with or without rituximab. Patients receiving rituximab-based therapy (n = 24) had 5-year progression-free survival (PFS) of 21.0 (88.0%), compared with 14.0 (61.0%) for those not receiving rituximab (n = 23, P = 0.036). Twenty-three patients were alive with a median follow-up of 20.7 months (range 2.5-89.2). PFS at 1 and 2 years was 51.0% and 27.0%, and overall survival (OS) 78.0% and 72.0%, respectively. Use of more than 2.0 lines of therapy, use of bendamustine-rituximab, and high TLC (>10,000.0/cu.mm) significantly affected PFS. Conclusions: In our experience, MCL patients from north India have an early age at presentation. When treated with regimens including rituximab results in an improved response rate and PFS. This study provided comprehensive insights into the treatment of MCL in a developing country.
Amit Baran Das,Vaibhav V. Goud,Chandan Das 한국식품과학회 2021 Food Science and Biotechnology Vol.30 No.1
The effect of extrusion cooking on the quality ofrice extrudate with infused microencapsulated anthocyaninwas investigated. The moisture sorption isotherm of theextrudate was also studied. The rotatable central compositedesign was used to optimize the extrusion process and theoptimized conditions were: screw speed, 121 rpm; barreltemperature, 91.89 C; and moisture content, 22.03%. Theextrudate showed anthocyanin content of 0.218 mg/L; truedensity, 1.48 g/cc; water activity 0.51, water solubilityindex, 7.49%; and specific mechanical energy, 31.39 kJ/kg. The antioxidant activity and solubility of the extrudatewere higher as compared with native extrudate. Themoisture sorption isotherm of the extrudate was found tofollow type III isotherm behavior according to the Brunauer–Emmett–Teller classification. The sorption isothermwas analyzed using several models and the Caurie andPeleg models were best fitted with the extrudate isothermdata. The present work manifested a way to developantioxidant rich extrudate.
Implementation of New Method to Generate a Key in Automatic Variable Key for Perfect Security
Moumita Das,Rajat Subhra Goswami,Chandan Tilak Bhunia 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.4
Automatic variable key is a technique to generate time variant key. In this paper, we have proposed a new key generation technique. The proposed technique provides higher level of security compared to that provided by other key generating schemes. The newly generated keys in the technique are more random.
Rohit Kaushal,Chandan J. Das,Prabhjot Singh,Prem Nath Dogra,Rajeev Kumar 대한비뇨의학회 2019 Investigative and Clinical Urology Vol.60 No.3
Purpose: To prospectively evaluate the diagnostic yield of multiparametric magnetic resonance imaging (mpMRI)-fusion, transrectal ultrasound (TRUS)-guided prostate biopsies for detection of prostate cancer in an Asian population with a low incidence of prostate cancer. Materials and Methods: A total of 131 males with suspected prostate cancer were recruited to undergo fusion biopsy with the Artemis prostate fusion biopsy device (Eigen, Grass Valley, CA, USA). All patients underwent standard 12-core systematic biopsies in addition to biopsies targeted at the mpMRI-identified abnormal regions. Yield from the standard cores was compared with that from the targeted cores. Gleason scores of 4+3 or higher were considered significant. Results: The mean age of the patients was 63.54±7.96 years and the mean prostate-specific antigen value was 9.75±5.35 ng/mL. A total of 36 patients had cancer, of which 3 (8.3%) were detected only on standard cores and 3 (8.3%) only on targeted cores. Of the clinically significant cancers (n=30), targeted biopsy detected a higher number (28/30, 93.3%) than standard biopsy (21/30, 70.0%). A total of 6 of 8 cancers (75.0%) that were insignificant on standard biopsy were upgraded to significant cancer on targeted cores. Conclusions: Eight percent of cancers were detected only on MRI-TRUS fusion-targeted biopsies, whereas the method upgraded more than two-thirds of insignificant cancers to significant cancers. Fusion biopsies thus provide incremental information over standard TRUS biopsies in the diagnosis of significant prostate cancer in populations with a low incidence of prostate cancer.
Avijit Dutta,Chandan Nath,Md. Moktadir Billah Reza,Tridip Das,Eaftekhar Ahmed Rana,Ayesha Sultana,Mohammad Shah Jalal 대한미생물학회 2023 Journal of Bacteriology and Virology Vol.53 No.2
Staphylococcus aureus (S. aureus) not only causes significant loss of livestock pro-duction but also has potential public health risks. This study was conducted withthe objective of characterizing the antibiogram of S. aureus from goats attendinga Teaching Veterinary Hospital in Bangladesh. We aimed to study the spa type,potential virulence factor(s), and the presence of methicillin and vancomycinresistance genes in the isolates. From a total of 200 goat nasal swab samples S. aureus was confirmed by PCR. Antimicrobial susceptibility testing was performedusing the disc diffusion method followed by mecA and vanA gene PCR. Staphy-lococcal protein A (spa) typing was conducted for selected isolates. A set ofmajor virulence determinants, including sea, seb, pvl, and tst were investigatedby PCR. A total 11.5% (n=23) of S. aureus isolates were obtained. Ciprofloxacinresistance was the highest (100%; n=23) followed by cefoxitin (74%; n=17). About 91% of the isolates (n=21) were multidrug-resistant (resistant to ≥3antimicrobial classes). One (6%) isolate was MRSA harboring mecA. Among 13vancomycin-resistant isolates, three (23%) were vanA-positive. Of the virulencegenes screened, sea was recorded in four (17%) isolates. The spa typing of tworandomly selected strains revealed that one isolate belonged to spa type t5259,and the other seemed to be novel. Goats having cutaneous and mucosal lesionshad higher S. aureus carriage (P=0.01) with a significant variation across thebreeds (P= 0.02). This study provides insights into S. aureus strains circulating inthe goat population in Bangladesh.
Arka Dey,Mrinmay Das,Joydeep Datta,Rajkumar Jana,Joydeep Dhar,Sayantan Sil,Debasish Biswas,Chandan Banerjee,Partha Pratim Ray 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.4
Here we have presented the results of large area (30 × 30 cm2) siliconhydrogenalloy material and solar cell by argon dilution method. As analternative to hydrogen dilution, argon dilution method has been appliedto develop single junction solar cell with appreciable stability. Optimization of deposition conditions revealed that 95% argon dilutiongives a nanostructured material with improved transport property andless light induced degradation. The minority carrier diffusion length (Ld)and mobility-lifetime (μτ) product of the material with 95% argondilution degrades least after light soaking. Also the density of states(DOS) below conduction level reveals that this material is lessdefective. Solar cell with this argon diluted material has been fabricatedwith all the layers deposited by argon dilution method. Finally we havecompared the argon diluted solar cell results with the optimizedhydrogen diluted solar cell. Light soaking study proves that it is possibleto develop stable solar cell on large area by argon dilution method andthat the degradation of argon diluted solar cell is less than that ofhydrogen diluted one.