1
|
Sontakke GS, Chaturvedi AK, Jana D, Volla CMR. Pyrazolidinone-Aided Ru(II)-Catalyzed Regioselective C-H Annulation with Allenes. Org Lett 2024. [PMID: 38767934 DOI: 10.1021/acs.orglett.4c01245] [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: 05/22/2024]
Abstract
Regioselective annulation of allenes via C-H activation represents an elegant synthetic approach toward the construction of valuable scaffolds. Considering the importance of allenes, herein we developed an unprecedented Ru(II)-catalyzed highly regioselective redox-neutral C-H activation/(4 + 1)-annulation of 1-arylpyrazolidinones employing allenyl acetates to access pyrazolo[1,2-a]indazol-1-one derivatives. Additionally, allenyl cyclic carbonates, which were never tested in C-H activation, were utilized to construct a similar class of heterocycles having a pendent alcohol functionality. Notably, double C-H functionalization was achieved by a simple modification of reaction conditions. The synthetic significance of this methodology is underscored by late-stage modification of natural products, broad substrate scope, gram-scale synthesis, and postfunctionalizations.
Collapse
Affiliation(s)
- Geetanjali S Sontakke
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India
| | - Atul K Chaturvedi
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India
| | - Debasish Jana
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India
| | - Chandra M R Volla
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India
| |
Collapse
|
2
|
Jana D, Malama S, Narasimhan S, Taciroglu E. Edge-based graph neural network for ranking critical road segments in a network. PLoS One 2023; 18:e0296045. [PMID: 38127943 PMCID: PMC10734987 DOI: 10.1371/journal.pone.0296045] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Accepted: 12/01/2023] [Indexed: 12/23/2023] Open
Abstract
Transportation networks play a crucial role in society by enabling the smooth movement of people and goods during regular times and acting as arteries for evacuations during catastrophes and natural disasters. Identifying the critical road segments in a large and complex network is essential for planners and emergency managers to enhance the network's efficiency, robustness, and resilience to such stressors. We propose a novel approach to rapidly identify critical and vital network components (road segments in a transportation network) for resilience improvement or post-disaster recovery. We pose the transportation network as a graph with roads as edges and intersections as nodes and deploy a Graph Neural Network (GNN) trained on a broad range of network parameter changes and disruption events to rank the importance of road segments. The trained GNN model can rapidly estimate the criticality rank of individual road segments in the modified network resulting from an interruption. We address two main limitations in the existing literature that can arise in capital planning or during emergencies: ranking a complete network after changes to components and addressing situations in post-disaster recovery sequencing where some critical segments cannot be recovered. Importantly, our approach overcomes the computational overhead associated with the repeated calculation of network performance metrics, which can limit its use in large networks. To highlight scenarios where our method can prove beneficial, we present examples of synthetic graphs and two real-world transportation networks. Through these examples, we show how our method can support planners and emergency managers in undertaking rapid decisions for planning infrastructure hardening measures in large networks or during emergencies, which otherwise would require repeated ranking calculations for the entire network.
Collapse
Affiliation(s)
- Debasish Jana
- Samueli Civil and Environmental Engineering, University of California Los Angeles, Los Angeles, California, United States of America
| | - Sven Malama
- Samueli Civil and Environmental Engineering, University of California Los Angeles, Los Angeles, California, United States of America
| | - Sriram Narasimhan
- Samueli Civil and Environmental Engineering, University of California Los Angeles, Los Angeles, California, United States of America
- Samueli Mechanical and Aerospace Engineering, University of California Los Angeles, Los Angeles, California, United States of America
| | - Ertugrul Taciroglu
- Samueli Civil and Environmental Engineering, University of California Los Angeles, Los Angeles, California, United States of America
| |
Collapse
|
3
|
Jana D, Nagarajaiah S. Full-Field Vibration Response Estimation from Sparse Multi-Agent Automatic Mobile Sensors Using Formation Control Algorithm. Sensors (Basel) 2023; 23:7848. [PMID: 37765905 PMCID: PMC10537326 DOI: 10.3390/s23187848] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 09/01/2023] [Accepted: 09/11/2023] [Indexed: 09/29/2023]
Abstract
In structural vibration response sensing, mobile sensors offer outstanding benefits as they are not dedicated to a certain structure; they also possess the ability to acquire dense spatial information. Currently, most of the existing literature concerning mobile sensing involves human drivers manually driving through the bridges multiple times. While self-driving automated vehicles could serve for such studies, they might entail substantial costs when applied to structural health monitoring tasks. Therefore, in order to tackle this challenge, we introduce a formation control framework that facilitates automatic multi-agent mobile sensing. Notably, our findings demonstrate that the proposed formation control algorithm can effectively control the behavior of the multi-agent systems for structural response sensing purposes based on user choice. We leverage vibration data collected by these mobile sensors to estimate the full-field vibration response of the structure, utilizing a compressive sensing algorithm in the spatial domain. The task of estimating the full-field response can be represented as a spatiotemporal response matrix completion task, wherein the suite of multi-agent mobile sensors sparsely populates some of the matrix's elements. Subsequently, we deploy the compressive sensing technique to obtain the dense full-field vibration complete response of the structure and estimate the reconstruction accuracy. Results obtained from two different formations on a simply supported bridge are presented in this paper, and the high level of accuracy in reconstruction underscores the efficacy of our proposed framework. This multi-agent mobile sensing approach showcases the significant potential for automated structural response measurement, directly applicable to health monitoring and resilience assessment objectives.
Collapse
Affiliation(s)
- Debasish Jana
- Samueli Civil and Environmental Engineering, University of California, Los Angeles, CA 90095, USA;
- Civil and Environmental Engineering, Rice University, Houston, TX 77005, USA
| | - Satish Nagarajaiah
- Civil and Environmental Engineering, Rice University, Houston, TX 77005, USA
- Mechnanical Engineering, Rice University, Houston, TX 77005, USA
| |
Collapse
|
4
|
Jana D, Nagarajaiah S. Physics-Guided Real-Time Full-Field Vibration Response Estimation from Sparse Measurements Using Compressive Sensing. Sensors (Basel) 2022; 23:384. [PMID: 36616982 PMCID: PMC9823471 DOI: 10.3390/s23010384] [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] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 12/21/2022] [Accepted: 12/24/2022] [Indexed: 06/17/2023]
Abstract
In civil, mechanical, and aerospace structures, full-field measurement has become necessary to estimate the precise location of precise damage and controlling purposes. Conventional full-field sensing requires dense installation of contact-based sensors, which is uneconomical and mostly impractical in a real-life scenario. Recent developments in computer vision-based measurement instruments have the ability to measure full-field responses, but implementation for long-term sensing could be impractical and sometimes uneconomical. To circumvent this issue, in this paper, we propose a technique to accurately estimate the full-field responses of the structural system from a few contact/non-contact sensors randomly placed on the system. We adopt the Compressive Sensing technique in the spatial domain to estimate the full-field spatial vibration profile from the few actual sensors placed on the structure for a particular time instant, and executing this procedure repeatedly for all the temporal instances will result in real-time estimation of full-field response. The basis function in the Compressive Sensing framework is obtained from the closed-form solution of the generalized partial differential equation of the system; hence, partial knowledge of the system/model dynamics is needed, which makes this framework physics-guided. The accuracy of reconstruction in the proposed full-field sensing method demonstrates significant potential in the domain of health monitoring and control of civil, mechanical, and aerospace engineering systems.
Collapse
Affiliation(s)
- Debasish Jana
- Samueli Civil and Environmental Engineering, University of California Los Angeles, Los Angeles, CA 90095, USA
- Civil and Environmental Engineering, Rice University, Houston, TX 77005, USA
| | - Satish Nagarajaiah
- Civil and Environmental Engineering, Rice University, Houston, TX 77005, USA
- Mechnanical Engineering, Rice University, Houston, TX 77005, USA
| |
Collapse
|
5
|
Nanda SS, Nayak P, Mandal S, Jana D, Goutam U, Dash S. Synthesis, Judd-Ofelt analysis and energy transfer mechanism in β-NaYGdF4: Eu3+ microphosphors. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
6
|
Jana D, Purkait K, Samaddar S, Haque A, Purkait M. Electron removal from H2O by hydrogen-like projectile impact. Appl Radiat Isot 2022; 182:110100. [DOI: 10.1016/j.apradiso.2022.110100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 12/14/2021] [Accepted: 01/04/2022] [Indexed: 11/02/2022]
|
7
|
Kar AK, Chattopadhyay B, Singha R, Barman A, Ahmed MA, Midya A, Bandyopadhyay S, Mukherjee D, Jana D, Mandal P. Effect of Co and Mg doping at Cu site on structural, magnetic and dielectric properties of α-Cu 2V 2O 7. J Phys Condens Matter 2021; 34:075702. [PMID: 34763320 DOI: 10.1088/1361-648x/ac38df] [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: 09/06/2021] [Accepted: 11/11/2021] [Indexed: 06/13/2023]
Abstract
We have studied the effect of doping of both magnetic (Co) and nonmagnetic (Mg) ions at the Cu site on phase transition in polycrystalline α-Cu2V2O7through structural, magnetic, and electrical measurements. X-ray diffraction reveals that Mg doping triggers an onset ofα- toβ-phase structural transition in Cu2-xMgxV2O7above a critical Mg concentrationxc= 0.15, and both the phases coexist up tox= 0.25. Cu2V2O7possesses a non-centrosymmetric crystal structure and antiferromagnetic ordering along with a non-collinear spin structure in theαphase, originated from the microscopic Dzyaloshinskii-Moriya interaction between the neighboring Cu spins. Accordingly, a weak ferromagnetic (FM) behavior has been observed up tox= 0.25. However, beyond this concentration, Cu2-xMgxV2O7exhibits complex magnetic properties. A clear dielectric anomaly is observed in α-Cu2-xMgxV2O7around the magnetic transition temperature, which loses its prominence with the increase in Mg doping. The analysis of experimental data shows that the magnetoelectric coupling is nonlinear, which is in agreement with the Landau theory of continuous phase transitions. Co doping, on the other hand, initiates a sharpαtoβphase transition around the same critical concentrationxc= 0.15 in Cu2-xCoxV2O7but the FM behavior is very weak and can be detected only up tox= 0.10. We have drawn the magnetic phase diagram which indicates that the rate of suppression in transition temperature is the same for both types of doping, magnetic (Co) and nonmagnetic (Zn/Mg).
Collapse
Affiliation(s)
- Abja Keshar Kar
- Department of Physics, Lady Brabourne College, P-1/2 Suhrawardy Avenue, Kolkata 700 017, India
| | - Bidisa Chattopadhyay
- Department of Physics, Lady Brabourne College, P-1/2 Suhrawardy Avenue, Kolkata 700 017, India
| | - Ratnadwip Singha
- Saha Institute of Nuclear Physics, HBNI, 1/AF Bidhannagar, Kolkata 700 064, India
| | - Abhisikta Barman
- School of Physical Sciences, Indian Association for the Cultivation of Science, 2A and 2B Raja S. C. Mullick Road, Kolkata 700032, India
| | - Md A Ahmed
- Department of Physics, Sambhunath College, Labpur, Birbhum-731 303, West Bengal, India
| | - A Midya
- Department of Physics, City College, 102/1, Raja Rammohan Sarani, College Street, Kolkata 700 009, India
| | - S Bandyopadhyay
- Department of Physics, University of Calcutta, 92 A.P.C. Road, Kolkata 700 009, India
- CRNN, University of Calcutta, JD 2, Sector III, Salt Lake, Kolkata 700 098, India
| | - Devajyoti Mukherjee
- School of Physical Sciences, Indian Association for the Cultivation of Science, 2A and 2B Raja S. C. Mullick Road, Kolkata 700032, India
| | - D Jana
- Department of Physics, University of Calcutta, 92 A.P.C. Road, Kolkata 700 009, India
| | - Prabhat Mandal
- Saha Institute of Nuclear Physics, HBNI, 1/AF Bidhannagar, Kolkata 700 064, India
| |
Collapse
|
8
|
Sarkar AG, Jana D, Sarkar T. 03. Impact of lactational training and nipple evaluation during pregnancy in reducing lactational mastitis and breast abscess. Eur J Surg Oncol 2021. [DOI: 10.1016/j.ejso.2021.03.199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
|
9
|
Sarkar DK, Khan M, Banerjee R, Jana D. P028. Vitamin D deficiency in mastalgia: Is it a coincidence or an association? Eur J Surg Oncol 2019. [DOI: 10.1016/j.ejso.2019.01.050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
|
10
|
Mukherjee S, Manna A, Bhattacharjee P, Mazumdar M, Saha S, Chakraborty S, Guha D, Adhikary A, Jana D, Gorain M, Mukherjee SA, Kundu GC, Sarkar DK, Das T. Non-migratory tumorigenic intrinsic cancer stem cells ensure breast cancer metastasis by generation of CXCR4+ migrating cancer stem cells. Oncogene 2016; 35:4937-48. [DOI: 10.1038/onc.2016.26] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Revised: 11/02/2015] [Accepted: 11/27/2015] [Indexed: 12/18/2022]
|
11
|
Ghose S, Gogurla N, Ranganathan R, Jana D. The simultaneous emergence of free exciton emission and d0 ferromagnetism for undoped ZnO nanoparticles. RSC Adv 2016. [DOI: 10.1039/c6ra17151f] [Citation(s) in RCA: 8] [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: 11/21/2022] Open
Abstract
Free excitonic emission is observed for the ferromagnetic undoped ZnO nanoparticles prepared by mechanical milling.
Collapse
Affiliation(s)
| | - N. Gogurla
- Department of Physics
- Indian Institute of Technology
- Kharagpur 721302
- India
| | - R. Ranganathan
- Condensed Matter Physics Division (Experiment)
- Saha Institute of Nuclear Physics
- Kolkata 700064
- India
| | - D. Jana
- Department of Physics
- University of Calcutta
- Kolkata 700009
- India
| |
Collapse
|
12
|
Sarkar A, Sanyal D, Nath P, Chakrabarti M, Pal S, Chattopadhyay S, Jana D, Asokan K. Defect driven ferromagnetism in SnO2: a combined study using density functional theory and positron annihilation spectroscopy. RSC Adv 2015. [DOI: 10.1039/c4ra11658e] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [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] Open
Abstract
Room temperature ferromagnetic ordering has been observed in polycrystalline SnO2. Defect characterization by positron annihilation technique and ab initio calculation indicates that tin vacancies are mainly responsible for inducing magnetic moment in oxygen irradiate SnO2.
Collapse
Affiliation(s)
- A. Sarkar
- Department of Physics
- Bangabasi Morning College
- Kolkata 700009
- India
| | - D. Sanyal
- Variable Energy Cyclotron Centre
- Kolkata 700064
- India
| | - Palash Nath
- Department of Physics
- University of Calcutta
- Kolkata 700009
- India
| | | | - S. Pal
- Department of Physics
- University of Calcutta
- Kolkata 700009
- India
| | | | - D. Jana
- Department of Physics
- University of Calcutta
- Kolkata 700009
- India
| | - K. Asokan
- Inter University Accelerator Centre
- New Delhi 110067
- India
| |
Collapse
|
13
|
Ghose S, Rakshit T, Ranganathan R, Jana D. Role of Zn-interstitial defect states on d0 ferromagnetism of mechanically milled ZnO nanoparticles. RSC Adv 2015. [DOI: 10.1039/c5ra13846a] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [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] Open
Abstract
An impurity defect level formed by interstitial zinc at the surfaces of undoped ZnO nanoparticles plays a crucial role for d0 ferromagnetism.
Collapse
Affiliation(s)
| | - Tamita Rakshit
- Department of Physics
- Indian Institute of Technology
- Kharagpur 721302
- India
| | - R. Ranganathan
- Condensed Matter Physics Division (Experiment)
- Saha Institute of Nuclear Physics
- Kolkata 700064
- India
| | - D. Jana
- Department of Physics
- University of Calcutta
- Kolkata 700009
- India
| |
Collapse
|
14
|
Jana D, Bairagi N. Habitat complexity, dispersal and metapopulations: Macroscopic study of a predator–prey system. Ecological Complexity 2014. [DOI: 10.1016/j.ecocom.2013.11.006] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
15
|
Marik M, Mukherjee A, Jana D, Yoshizawa A, Chaudhuri BK. Dielectric spectroscopy of T-shaped blue-phase-III liquid crystal. Phys Rev E Stat Nonlin Soft Matter Phys 2013; 88:012502. [PMID: 23944469 DOI: 10.1103/physreve.88.012502] [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] [Received: 11/27/2012] [Indexed: 06/02/2023]
Abstract
Dielectric relaxation spectra of a liquid crystalline (LC) material showing blue-phase-III (BPIII) for a considerably large temperature regime consisting of T-shaped molecules are investigated. A low frequency relaxation mode is observed in the isotropic phase (I) as well as in BPIII of the investigating material which is attributed to the short axis rotation of the T-shaped molecules. The outcome of the temperature and dc bias field variation of dielectric strength (Δε) and relaxation frequency (ν(c)) in the vicinity of the I-BPIII transition is also discussed. The temperature dependence of ν(c) in BPIII with a minor deviation from Arrhenius activities in the fluctuation-dominated nonlinear region (FDNLR) is found to follow the unusual thermal behavior of the activation energy (E(A)). The growth of pretransitional fluctuations is found to be nonlinear in the vicinity of the I-BPIII transition. A moderate growth of transition fluctuation commences from the value of the exponent α(eff)=0.38/°C, which is obtained by an exponential variation of ν(c) with respect to temperature in BPIII. Observed dynamic phenomenon in the vicinity of the I-BPIII transition regions is explained on the basis of the Landau-de Gennes and Maier-Saupe Theories.
Collapse
Affiliation(s)
- Manoj Marik
- Department of Solid State Physics, Indian Association for the Cultivation of Science, Kolkata-700032, India
| | | | | | | | | |
Collapse
|
16
|
Jana D, Mani G, Schulzke C. Synthesis of Novel Polyazacryptands for Recognition of Tetrahedral Oxoanions and Their X-ray Structures. Inorg Chem 2013; 52:6427-39. [DOI: 10.1021/ic400319b] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Debasish Jana
- Department of Chemistry, Indian Institute of Technology-Kharagpur, Kharagpur,
West Bengal 721 302, India
| | - Ganesan Mani
- Department of Chemistry, Indian Institute of Technology-Kharagpur, Kharagpur,
West Bengal 721 302, India
| | - Carola Schulzke
- Ernst-Moritz-Arndt-Universität Greifswald, Institut für Biochemie, Felix-Hausdorff-Strasse 4, Greifswald
17487, Germany
| |
Collapse
|
17
|
Chattopadhyay S, Dutta S, Pandit P, Jana D, Chattopadhyay S, Sarkar A, Kumar P, Kanjilal D, Mishra DK, Ray SK. Optical property modification of ZnO: Effect of 1.2 MeV Ar irradiation. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/pssc.201000532] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
18
|
Mani G, Jana D, Kumar R, Ghorai D. Azatripyrrolic and Azatetrapyrrolic Macrocycles from the Mannich Reaction of Pyrrole: Receptors for Anions. Org Lett 2010; 12:3212-5. [DOI: 10.1021/ol101159q] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ganesan Mani
- Department of Chemistry, Indian Institute of Technology, Kharagpur, India 721 302
| | - Debasish Jana
- Department of Chemistry, Indian Institute of Technology, Kharagpur, India 721 302
| | - Rajnish Kumar
- Department of Chemistry, Indian Institute of Technology, Kharagpur, India 721 302
| | - Debasish Ghorai
- Department of Chemistry, Indian Institute of Technology, Kharagpur, India 721 302
| |
Collapse
|
19
|
Maiti R, Jana D, Das UK, Ghosh D. Antidiabetic effect of aqueous extract of seed of Tamarindus indica in streptozotocin-induced diabetic rats. J Ethnopharmacol 2004; 92:85-91. [PMID: 15099853 DOI: 10.1016/j.jep.2004.02.002] [Citation(s) in RCA: 110] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2003] [Revised: 01/16/2004] [Accepted: 02/03/2004] [Indexed: 05/24/2023]
Abstract
In Indian traditional system of medicine, herbal remedies are prescribed for the treatment of diseases including diabetes mellitus. In recent years, plants are being effectively tried in a variety of pathophysiological states. Tamarindus indica Linn. is one of them. In the present study, aqueous extract of seed of Tamarindus indica Linn. was found to have potent antidiabetogenic activity that reduces blood sugar level in streptozotocin (STZ)-induced diabetic male rat. Supplementation of this aqueous extract by gavage at the dose of 80 mg/0.5 ml distilled water/100 g body weight per day in STZ-induced diabetic rat resulted a significant diminution of fasting blood sugar level after 7 days. Continuous supplementation of this extract for 14 days resulted no significant difference in this parameter from control level. Moreover, this supplementation produced a significant elevation in liver and skeletal muscle glycogen content, activity of liver glucose-6-phosphate dehydrogenase in respect to diabetic group. Activities of liver glucose-6-phosphatase, liver and kidney glutamate oxaloacetate transaminase (GOT) and glutamate pyruvate transaminase (GPT) activities were decreased significantly in the aqueous extract supplemented group in respect to diabetic group. All these parameters were not resettled to the controlled level after 7 days of this extract supplementation but after 14 days of this supplementation, all the above mentioned parameters were restored to the control level.
Collapse
Affiliation(s)
- R Maiti
- Reproductive Endocrinology and Family Welfare Research Unit, Department of Human Physiology with Community Health, Vidyasagar University, Midnapore 721102, West Bengal, India
| | | | | | | |
Collapse
|
20
|
Jana D, Maiti R, Ghosh D. Effect of Stephania hernandifolia leaf extract on testicular activity in rats. Asian J Androl 2003; 5:125-9. [PMID: 12778324] [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: 03/02/2023] Open
Abstract
AIM The testicular inhibitory effect of the aqueous fraction of methanol extract of Stephania hernandifolia leaf was studied in male Wistar rats. METHODS The supernatent and the precipitate part of aqueous fractions of the methanol extract of the leaf were gavaged separately to rat at a similar dose of 200 mg/mL per 100 g body weight per day for 28 days. After cessation of treatment, various observations were conducted. RESULTS In both treated groups, there were significant decreases in the relative weights of the sex organs, the testicular key androgenic enzymes activities, the plasma level of testosterone, the number of different germ cells at stage VII of seminiferous epithelial cell cycle and the seminiferous tubular diameter in comparison to the controls. Neither of the parts had somatic, renal and hepatic toxicity. This study suggested that the active molecules present in the aqueous fraction of methanol extract of Stephania hernandifolia leaves might be steroids as indicated by thin layer chromatography using specific staining substance for steroid molecules. CONCLUSION In rats, the aqueous fraction of methanol extract of the S. hernandifolia leaves possesses certain testis-inhibitory substances, which may be steroid-like agents.
Collapse
Affiliation(s)
- D Jana
- Reproductive Endocrinology and Family Welfare Research Unit, Department of Human Physiology with Community Health, Vidyasagar University, Midnapore, 721 102 West Bengal, India
| | | | | |
Collapse
|
21
|
Abstract
This study examined the effect of sodium fluoride, a water pollutant important through the world, including India, on testicular steroidogenic and gametogenic activities in relation to testicular oxidative stress in rats. Sodium fluoride treatment at 20mg/kg/day for 29 days by oral gavage resulted in significant diminution in the relative wet weight of the testis, prostate, and seminal vesicle without alteration in the body weight gain. Testicular delta(5),3beta-hydroxysteroid dehydrogenase (HSD) and 17beta-HSD activities were decreased significantly along with significant diminution in plasma levels of testosterone in the fluoride-exposed group compared to the control. Epididymal sperm count was decreased significantly in the fluoride-treated group and qualitative examination of testicular sections revealed fewer mature luminal spermatozoa in comparison to the control. The seminiferous tubules were dilated in treated animals. Fluoride treatment was associated with oxidative stress as indicated by an increased level of conjugated dienes in the testis, epididymis, and epididymal sperm pellet with respect to control. Peroxidase and catalase activities in the sperm pellet were decreased significantly in comparison to the control. The results of this experiment indicate that fluoride at a dose encountered in drinking water in contaminated areas exerts an adverse effect on the male reproductive system and this effect is associated with indicators of oxidative stress.
Collapse
Affiliation(s)
- D Ghosh
- Department of Human Physiology with Community Health, Reproductive Endocrinology and Family Welfare Research Unit, Vidyasagar University, Midnapore 721 102, West Bengal, India.
| | | | | | | | | |
Collapse
|
22
|
Ghosh D, Jana D, Debnath JM. Effects of leaf extract of Stephania hernandifolia on testicular gametogenesis and androgenesis in albino rats: a dose-dependent response study. Contraception 2002; 65:379-84. [PMID: 12057793 DOI: 10.1016/s0010-7824(02)00282-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The present study was undertaken to evaluate the dose-dependent effects of a leaf extract of Stephania hernandifolia on testicular activities in albino rats. Whether this leaf extract has any toxic effect on metabolic organs or on the liver or kidney was studied. Adult male Wistar rats, maintained under standard laboratory conditions, were forcefully fed with the aqueous extract of these leaves at the dose of 2 g or 4 g of leaves/mL distilled water/100 g body weight/day for 28 days. All the animals, along with vehicle-treated controls, were killed on the Day 29 of the experiment. Treatment with this leaf extract at both doses resulted in significant reduction in relative weight in the testis, the seminal vesicles, the prostate, and the epididymis without any significant change in the liver and kidney weight in comparison to control. Activities of testicular steroidogenic key enzymes and plasma testosterone level were decreased significantly, along with a significant reduction in the number of germ cells at stage VII of the spermatogenic cycle and in the seminiferous tubular diameter in both treated groups in comparison to control. Activities of glutamate oxaloacetate transaminase, glutamate pyruvate transaminase, acid phosphatase, and alkaline phosphatase were not altered significantly in the liver and kidney in both treated groups compared with controls. We concluded that treatment with an aqueous extract of leaves resulted in diminution in the activities of testicular androgenic key enzymes and plasma level of testosterone along with inhibition of spermatogenesis without any induction of hepatic and renal toxicity.
Collapse
Affiliation(s)
- D Ghosh
- Reproductive Endocrinology and Family Welfare Unit, Department of Human Physiology with Community Health, Vidyasagar University, Midnapore, 721 102, West Bengal, India.
| | | | | |
Collapse
|
23
|
Jana D, Nandi D, Maiti RK, Ghosh D. Effect of human chorionic gonadotrophin coadministration on the activities of ovarian Delta5-3beta-hydroxysteroid dehydrogenase, and 17beta-hydroxysteroid dehydrogenase, and ovarian and uterine histology in lithium chloride-treated albino rats. Reprod Toxicol 2001; 15:215-9. [PMID: 11297879 DOI: 10.1016/s0890-6238(01)00115-0] [Citation(s) in RCA: 8] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Lithium chloride, a compound with clinical use in bipolar disorder, produces adverse effects on ovarian function in amphibian and rodent models. This study examined the effect of human chorionic gonadotrophin coadministration on ovarian steroidogenic and gametogenic activities in lithium chloride-treated rats. Relative ovarian and uterine weights, ovarian Delta(5)-3beta-hydroxysteroid dehydrogenase and 17beta-hydroxysteroid dehydrogenase activities, folliculogenesis, uterine diameter, endometrial and myometrial thickness, and uterine luminal epithelial height were decreased significantly after lithium chloride treatment for 28 days at 1.6 mg/kg/day, the human therapeutic dose. These parameters were unchanged from the control level when subcutaneous (s.c.) human chorionic gonadotrophin (hCG) at 25 microg/kg/day was coadministered with the lithium chloride. The duration of the oestrous cycle was increased in lithium chloride-treated rat with longer metestrous and diestrous phases. Administration of hCG with lithium chloride prevented these estrous cycle alterations. We conclude that hCG can protect ovarian steroidogenic and gametogenic function after lithium chloride treatment.
Collapse
Affiliation(s)
- D Jana
- Reproductive Endocrinology and Family Welfare Unit, Department of Human Physiology with Community Health, Vidyasagar University, Midnapore- 721 102, West Bengal, India
| | | | | | | |
Collapse
|
24
|
Chandra A, Jana D, Bhattacharjee S. A molecular theory of frequency and wave‐vector‐dependent dynamic response functions of electrolyte solutions. J Chem Phys 1996. [DOI: 10.1063/1.471555] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
25
|
Jana D, Banerjee G. Bilateral frontal lobe ct scan abnormality following ect in an adolescent. Indian J Psychiatry 1992; 34:392-4. [PMID: 21776154 PMCID: PMC2982983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
A case is described of bilateral frontal lobe CT Scan abnormality associated with ECT in an adolescent. Possible causes and risk factors are discussed.
Collapse
Affiliation(s)
- D Jana
- Asstt. Professor of Neurology, NRS Medical College, Calcutta
| | | |
Collapse
|
26
|
Kundu K, Jana D, Das M. Standard potentials of the silver/silver-iodide electrode in aqueous mixtures of ethylene glycol at different temperatures and the thermodynamics of transfer of hydrogen halides from water to glycolic media. Electrochim Acta 1973. [DOI: 10.1016/0013-4686(73)87017-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|