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Takyi EM, Bhattacharyya J, Parshad RD. A Gender-Selective Harvesting Strategy: Weak Allee Effects and a Non-hyperbolic Extinction Boundary. Acta Biotheor 2023; 71:11. [PMID: 36933097 DOI: 10.1007/s10441-023-09462-w] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2021] [Accepted: 02/24/2023] [Indexed: 03/19/2023]
Abstract
Recently a gender-selective harvesting strategy has been proposed for possible control of aquatic invasive species, wherein females of the invasive species are harvested, whilst stocking the males (abbreviated as FHMS strategy) (Lyu et al. in Nat Resour Model 33(2):e12252, 2020). We consider the FHMS strategy with a weak Allee effect, and show that its extinction boundary need not be hyperbolic. To the best of our knowledge, this is the first example of a non-hyperbolic extinction boundary in two-compartment mating models structured by sex. The model possesses a rich dynamical structure, with several local co-dimension one bifurcations occurring. We also show the occurrence of a global homoclinic bifurcation, which has applicability for large scale strategic bio-control.
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Affiliation(s)
- Eric M Takyi
- Department of Mathematics and Computer Science, Ursinus College, Collegeville, PA, 19426, USA.
| | - Joydeb Bhattacharyya
- Department of Mathematics, Karimpur Pannadevi College, Nadia, West Bengal, 741152, India
| | - Rana D Parshad
- Department of Mathematics, Iowa State University, Ames, IA, 50011, USA
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Bhattacharyya J, Roelke DL, Walton JR, Banerjee S. Using YY supermales to destabilize invasive fish populations. Theor Popul Biol 2020; 134:1-14. [PMID: 32335069 DOI: 10.1016/j.tpb.2020.04.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Revised: 12/04/2019] [Accepted: 04/08/2020] [Indexed: 11/18/2022]
Abstract
A plausible biocontrol strategy for the eradication of invasive species involves augmenting wild populations with genetically modified supermales. Supermales contain double YY chromosomes. When they are augmented into a wild population, destabilization and eventual extinction occurs over time due to a strongly skewed gender ratio towards males. Here, we employ a mathematical model that considers an Allee effect, but we have discovered through simulation that the presence of supermales leads to an increase in the minimal number of females needed for survival at a value higher than the mathematically defined Allee effect. Using this effect, we focus our research on exploring the sensitivity of the optimized supply rate of supermale fish to the initial gender ratio and density of the wild populations. We find that the eradication strategy with optimized supply rate of supermales can be determined with knowledge of reproductive rate and survival fitness of supermale fish.
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Affiliation(s)
| | - Daniel L Roelke
- Department of Marine Biology, Texas A&M University at Galveston, 200 Seawolf Parkway, Galveston, TX 77554, USA
| | - Jay R Walton
- Department of Mathematics, Texas A&M University, College Station, TX 77843-3368, USA
| | - Soumitro Banerjee
- Department of Physical Sciences, Indian Institute of Science Education and Research, Kolkata, WB 741246, India
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Muhl RMW, Roelke DL, Zohary T, Moustaka-Gouni M, Sommer U, Borics G, Gaedke U, Withrow FG, Bhattacharyya J. Resisting annihilation: relationships between functional trait dissimilarity, assemblage competitive power and allelopathy. Ecol Lett 2018; 21:1390-1400. [PMID: 29992677 DOI: 10.1111/ele.13109] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Revised: 04/19/2018] [Accepted: 06/10/2018] [Indexed: 11/28/2022]
Abstract
Allelopathic species can alter biodiversity. Using simulated assemblages that are characterised by neutrality, lumpy coexistence and intransitivity, we explore relationships between within-assemblage competitive dissimilarities and resistance to allelopathic species. An emergent behaviour from our models is that assemblages are more resistant to allelopathy when members strongly compete exploitatively (high competitive power). We found that neutral assemblages were the most vulnerable to allelopathic species, followed by lumpy and then by intransitive assemblages. We find support for our modeling in real-world time-series data from eight lakes of varied morphometry and trophic state. Our analysis of this data shows that a lake's history of allelopathic phytoplankton species biovolume density and dominance is related to the number of species clusters occurring in the plankton assemblages of those lakes, an emergent trend similar to that of our modeling. We suggest that an assemblage's competitive power determines its allelopathy resistance.
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Affiliation(s)
- Rika M W Muhl
- Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station, TX, 77843-2258, USA
| | - Daniel L Roelke
- Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station, TX, 77843-2258, USA.,Department of Oceanography, Texas A&M University, College Station, TX, 77843, USA
| | - Tamar Zohary
- Kinneret Limnological Laboratory, P.O.B. 447, Migdal, 14950, Israel
| | - Maria Moustaka-Gouni
- School of Biology, Aristotle University of Thessaloniki, GR-541 24, Thessaloniki, Greece
| | - Ulrich Sommer
- GEOMAR, Helmholtz-Zentrum für Ozeanforschung Kiel, Experimentelle Ökologie I (Nahrungsnetze), Düsternbrooker Weg 20, D-24105, Kiel, Germany
| | - Gábor Borics
- Department of Tisza Research, MTA Centre for Ecological Research, 18/c, Bem square, Debrecen, 4026, Hungary.,MTA Centre for Ecological Research, GINOP Sustainable Ecosystems Group, 3. Klebelsberg Kuno str., H-8237, Tihany, Hungary
| | - Ursula Gaedke
- Institute of Biochemistry and Biology, University of Potsdam, Maulbeerallee 2, D-14469, Potsdam, Germany
| | - Frances G Withrow
- Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station, TX, 77843-2258, USA
| | - Joydeb Bhattacharyya
- Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station, TX, 77843-2258, USA
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Bhattacharyya J, Roelke DL, Muhl RM, Withrow FG. Exploitative competition of invaders differentially influences the diversity of neutral, lumpy and intransitive phytoplankton assemblages in spatially heterogeneous environments. Ecol Modell 2018. [DOI: 10.1016/j.ecolmodel.2017.12.020] [Citation(s) in RCA: 2] [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: 11/27/2022]
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Withrow FG, Roelke DL, Muhl RM, Bhattacharyya J. Water column processes differentially influence richness and diversity of neutral, lumpy and intransitive phytoplankton assemblages. Ecol Modell 2018. [DOI: 10.1016/j.ecolmodel.2018.01.002] [Citation(s) in RCA: 3] [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: 10/18/2022]
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Goswami S, Kundra P, Bhattacharyya J. Pectoral nerve block1 versus modified pectoral nerve block2 for postoperative pain relief in patients undergoing modified radical mastectomy: a randomized clinical trial. Br J Anaesth 2017; 119:830-835. [PMID: 29121291 DOI: 10.1093/bja/aex201] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/05/2017] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Pectoral nerve block1 (PEC1) given between pectoralis major and minor, and modified pectoral nerve block2 (mPEC2) performed between pectoralis minor and serratus anterior, can provide continuous analgesia after modified radical mastectomy (MRM) when catheters are placed before skin closure. This study was designed to compare PEC1 and mPEC2 block for providing postoperative pain relief after MRM. METHODS Sixty-two physically fit patients undergoing MRM were assigned into two groups (Group PEC1, n=31 and Group mPEC2, n=31). Before wound closure, epidural catheter was placed in the group designated muscle plane and 30ml of 0.25% bupivacaine was injected through the catheter after wound closure. Bupivacaine 15ml of 0.25% top up was given on patient's demand or whenever visual analogue scale (VAS) score was>4. Time for first analgesia (TFA), number of top ups and VAS was recorded at 0.5, 6, 12, 18, 24 h after surgery. Sensory blockade was assessed 30 min after extubation. RESULTS Analgesia was significantly prolonged in group mPEC2 [mean(SD)] 313.45(43.05) vs 258.87(34.71) min in group PEC1, P<0.001. Total pain experienced over 24 h was significantly less in group mPEC2 [mean(SD)] 9.77(6.93) than in group PEC1 24.19(10.81), P<0.0001. Consequently, top up requirements were significantly reduced in group mPEC2 than in group PEC1 [median(range)] 3(2-4) vs 4(3-5) respectively, P<0.001. Lateral pectoral (77.42% and 35.48%) and thoracodorsal nerves (93.55% and 48.39%) had higher incidence of sensory block in group mPEC2 than group PEC1, P<0.001. CONCLUSIONS mPEC2 provides better postoperative analgesia than PEC1 when catheters are placed under direct vision after MRM. CLINICAL TRIAL REGISTRATION CTRI/2017/02/007811 (REF/2015/11/010185).
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Affiliation(s)
- S Goswami
- Department of Anaesthesiology & Critical Care, Vivekananda Institute of Medical Sciences, 99, Sarat Bose Road, Kolkata 700026, West Bengal, India
| | - P Kundra
- Department of Anaesthesiology & Critical Care, Jawaharlal Institute of Postgraduate Medical Education & Research, Pondicherry 605006, India
| | - J Bhattacharyya
- Department of Anaesthesiology & Critical Care, Vivekananda Institute of Medical Sciences, 99, Sarat Bose Road, Kolkata 700026, West Bengal, India
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Saikia K, Bhattacharyya J, Nath S. Prevalence and clinical significance of AML1-ETO t(8;21)(q22;q22) in acute myeloid leukaemia patients of Assam. Eur J Cancer 2016. [DOI: 10.1016/s0959-8049(16)32710-1] [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: 11/17/2022]
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Bhattacharyya J, Pal S. Hysteresis in coral reefs under macroalgal toxicity and overfishing. J Biol Phys 2015; 41:151-72. [PMID: 25708511 DOI: 10.1007/s10867-014-9371-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2014] [Accepted: 11/04/2014] [Indexed: 11/29/2022] Open
Abstract
Macroalgae and corals compete for the available space in coral reef ecosystems.While herbivorous reef fish play a beneficial role in decreasing the growth of macroalgae, macroalgal toxicity and overfishing of herbivores leads to proliferation of macroalgae. The abundance of macroalgae changes the community structure towards a macroalgae-dominated reef ecosystem. We investigate coral-macroalgal phase shifts by means of a continuous time model in a food chain. Conditions for local asymptotic stability of steady states are derived. It is observed that in the presence of macroalgal toxicity and overfishing, the system exhibits hysteresis through saddle-node bifurcation and transcritical bifurcation. We examine the effects of time lags in the liberation of toxins by macroalgae and the recovery of algal turf in response to grazing of herbivores on macroalgae by performing equilibrium and stability analyses of delay-differential forms of the ODE model. Computer simulations have been carried out to illustrate the different analytical results.
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Rice WD, Kono J, Zybell S, Winnerl S, Bhattacharyya J, Schneider H, Helm M, Ewers B, Chernikov A, Koch M, Chatterjee S, Khitrova G, Gibbs HM, Schneebeli L, Breddermann B, Kira M, Koch SW. Observation of forbidden exciton transitions mediated by Coulomb interactions in photoexcited semiconductor quantum wells. Phys Rev Lett 2013; 110:137404. [PMID: 23581371 DOI: 10.1103/physrevlett.110.137404] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2012] [Revised: 11/27/2012] [Indexed: 06/02/2023]
Abstract
We use terahertz pulses to induce resonant transitions between the eigenstates of optically generated exciton populations in a high-quality semiconductor quantum well sample. Monitoring the excitonic photoluminescence, we observe transient quenching of the 1s exciton emission, which we attribute to the terahertz-induced 1s-to-2p excitation. Simultaneously, a pronounced enhancement of the 2s exciton emission is observed, despite the 1s-to-2s transition being dipole forbidden. A microscopic many-body theory explains the experimental observations as a Coulomb-scattering mixing of the 2s and 2p states, yielding an effective terahertz transition between the 1s and 2s populations.
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Affiliation(s)
- W D Rice
- Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, USA
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Bhattacharyya J, Pal S. Stage-structured cannibalism with delay in maturation and harvesting of an adult predator. J Biol Phys 2013; 39:37-65. [PMID: 23860833 PMCID: PMC3532665 DOI: 10.1007/s10867-012-9284-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2012] [Accepted: 08/20/2012] [Indexed: 10/27/2022] Open
Abstract
A three-dimensional stage-structured predator-prey model is proposed and analyzed to study the effect of predation and cannibalism of the organisms at the highest trophic level with non-constant harvesting. Time lag in maturation of the predator is introduced in the system and conditions for local asymptotic stability of steady states are derived. The length of the delay preserving the stability is also estimated. Moreover, it is shown that the system undergoes a supercritical Hopf bifurcation when the maturation time lag crosses a certain critical value. Computer simulations have been carried out to illustrate various analytical results.
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Affiliation(s)
| | - Samares Pal
- Department of Mathematics, University of Kalyani, Kalyani, 741235 India
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Bhattacharyya J, Smith HL, Pal S. Allelopathy of plasmid-bearing and plasmid-free organisms competing for two complementary resources in a chemostat. J Biol Dyn 2012; 6:628-644. [PMID: 22873609 DOI: 10.1080/17513758.2012.668565] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We consider a model of competition between plasmid-bearing and plasmid-free organisms for two complementary nutrients in a chemostat. We assume that the plasmid-bearing organism produces an allelopathic agent at the cost of its reproductive abilities which is lethal to plasmid-free organism. Our analysis leads to different thresholds in terms of the model parameters acting as conditions under which the organisms associated with the system cannot thrive even in the absence of competition. Local stability of the system is obtained in the absence of one or both the organisms. Also, global stability of the system is obtained in the presence of both the organisms. Computer simulations have been carried out to illustrate various analytical results.
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Bhattacharyya J, Wagner M, Zybell S, Winnerl S, Stehr D, Helm M, Schneider H. Simultaneous time and wavelength resolved spectroscopy under two-colour near infrared and terahertz excitation. Rev Sci Instrum 2011; 82:103107. [PMID: 22047280 DOI: 10.1063/1.3653394] [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] [Indexed: 05/31/2023]
Abstract
Time and wavelength resolved spectroscopy requires optical sources emitting very short pulses and a fast detection mechanism capable of measuring the evolution of the output spectrum as a function of time. We use table-top Ti:sapphire lasers and a free-electron laser (FEL) emitting ps pulses as excitation sources and a streak camera coupled to a spectrometer for detection. One of the major aspects of this setup is the synchronization of pulses from the two lasers which we describe in detail. Optical properties of the FEL pulses are studied by autocorrelation and electro-optic sampling measurements. We discuss the advantages of using this setup to perform photoluminescence quenching in semiconductor quantum wells and quantum dots. Carrier redistribution due to pulsed excitation in these heterostructures can be investigated directly. Sideband generation in quantum wells is also studied where the intense FEL pulses facilitate the detection of the otherwise weak nonlinear effect.
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Affiliation(s)
- J Bhattacharyya
- Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany.
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Mihara K, Bhattacharyya J, Kitanaka A, Yanagihara K, Kubo T, Takei Y, Asaoku H, Takihara Y, Kimura A. T-cell immunotherapy with a chimeric receptor against CD38 is effective in eliminating myeloma cells. Leukemia 2011; 26:365-7. [PMID: 21836610 DOI: 10.1038/leu.2011.205] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Bhattacharyya J, Das KP. EFFECT OF SURFACTANTS ON THE PREVENTION OF PROTEIN AGGREGATION DURING UNFOLDING AND REFOLDING PROCESSES-COMPARISON WITH MOLECULAR CHAPERONE α -CRYSTALLIN. J DISPER SCI TECHNOL 2007. [DOI: 10.1080/01932699908943842] [Citation(s) in RCA: 5] [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: 10/23/2022]
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Pramanik SK, Bhattacharyya J, Dutta S, Dey PK, Bhattacharyya A. Persistence of Acetamiprid in/on Mustard (Brassica juncea L.). Bull Environ Contam Toxicol 2006; 76:356-60. [PMID: 16468018 DOI: 10.1007/s00128-006-0929-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2005] [Accepted: 11/28/2005] [Indexed: 05/06/2023]
Affiliation(s)
- S K Pramanik
- Pesticide Residue Laboratory, Department of Agricultural Chemicals, Bidham Chandra Krishi Viswavidyalaya, Mohanpore-741252, Nadia, West Bengal, India
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Bhattacharyya J, Banerjee H, Das SP, Bhattacharyya A. Metabolism of fenazaquin, an acaricide in tea plant. Bull Environ Contam Toxicol 2005; 75:569-73. [PMID: 16385964 DOI: 10.1007/s00128-005-0789-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Affiliation(s)
- J Bhattacharyya
- Pesticide Residue Laboratory, Department of Agricultural Chemicals, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur-741252, Nadia, West Bengal, India
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Pramanik SK, Dutta S, Bhattacharyya J, Saha T, Dey PK, Das S, Bhattacharyya A. Persistence of profenofos residue on tea under northeast Indian climatic conditions. Bull Environ Contam Toxicol 2005; 74:645-51. [PMID: 16094877 DOI: 10.1007/s00128-005-0632-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Affiliation(s)
- S K Pramanik
- Pesticide Residue Laboratory, Department of Agricultural Chemicals, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur-741252, Nadia, West Bengal, India
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Garcés M, Caron P, Hetzer C, Le Pichon A, Bass H, Drob D, Bhattacharyya J. Deep infrasound radiated by the Sumatra earthquake and tsunami. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2005eo350002] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Potts KT, Bhattacharyya J, Smith SL, Ihrig AM, Girard CA. 1,2,4-Triazoles. XXXII. Syntheses and Correlation of Proton Magnetic Resonance Spectral Characteristics with Molecular Orbital Parameters of Derivatives of the s-Triazolo[4,3-a]quinoline and s-Triazolo[3,4-a]isoquinoline Ring Systems. J Org Chem 2002. [DOI: 10.1021/jo00799a611] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Abstract
The chaperone activity and biophysical properties of the 19 amino acid peptide DFVIFLDVKHFSPEDLTVK, identified as the functional element in alphaA-crystallin and here referred to as mini-alphaA-crystallin, were studied using light scattering and spectroscopic methods after altering its sequence and enantiomerism. The all-D and all-L conformers of the peptide do not show marked differences in their chaperone-like activity against heat-induced aggregation of alcohol dehydrogenase at 48 degrees C and dithiothreitol-induced aggregation of insulin. The retro peptide does not show any secondary structure and is also unable to act like a chaperone. Both all-L and all-D peptides lose their beta-sheet conformations, hydrophobicity and chaperone-like activity at temperatures > 50 degrees C. However, upon cooling, a significant portion of those properties was regained, suggesting temperature-dependent, reversible structural alterations in the peptides under investigation. We propose that both the hydrophobicity and beta-sheet conformation of the functional element of alphaA-crystallin are essential for chaperone-like activity.
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Affiliation(s)
- J Bhattacharyya
- Mason Eye Institute, Departments of Ophthalmology and Biochemistry, University of Missouri, Columbia 65212, USA
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Miles DH, Pelletier SW, Bhattacharyya J, Mody NV, Hedin PA. Antineoplastic agents. 4. Constituents of marsh grass. 7. Structural studies on juncusol. A novel cytotoxic 9,10-dihydrophenanthrene derivative from the marsh plant Juncus roemerianus. J Org Chem 2002. [DOI: 10.1021/jo00416a028] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Miles DH, Kokpol U, Bhattacharyya J, Atwood JL, Stone KE, Bryson TA, Wilson C. Structure of sarracenin. An unusual enol diacetal monoterpene from the insectivorous plant Sarracenia flava. J Am Chem Soc 2002. [DOI: 10.1021/ja00422a048] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abstract
Chlorpromazine (CPZ) is known to induce hyperglycaemia and can inhibit insulin secretion in both normal subjects and patients with latent diabetes mellitus. In this study, we have tried to determine a probable mechanism by which CPZ causes hyperglycaemia. It is possible that CPZ causes insulin aggregation by the reduction of disulphide bonds, thereby inactivating insulin and hence causing hyperglycaemia.
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Affiliation(s)
- J Bhattacharyya
- Protein Chemistry Laboratory, Department of Chemistry, Bose Institute, 93/1 Acharyya Prafulla Chandra Road, 700 009, Calcutta, India.
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Abstract
The mode and nature of the binding of chlorpromazine (CPZ), a psychotropic drug, with milk proteins--alpha-lactalbumin (with substantial amounts of alpha-helix, beta-sheet and random coil), alpha-lactoglobulin (a major beta-sheeted protein) and alphas-casein (a random coiled protein) have been studied spectrofluorometrically and spectropolarimetrically. The binding affinity of CPZ for unfolded proteins is comparatively less than that of folded proteins although the number of binding sites is smaller in the latter case, due to the greater extent of binding of CPZ for folded proteins. Thermodynamic analysis reveals that CPZ binds to alpha-lactalbumin and alphas-casein in an endothermic (deltaH degrees is positive) and hydrophobic manner but with beta-lactoglobulin in an exothermic (deltaH degrees is negative) manner. Far UV Circular dichroic studies reveal that CPZ increases the secondary structure of the major beta-sheeted protein, beta-lactoglobulin possibly by increasing the relative contact orders (non-local contacts) within the residues. On the other hand, for proteins possessing random coil, it increases the unfolded state of the protein. CPZ does not affect local contacts in alpha-helix when its interaction is compared with a major alpha-helical protein, myoglobin.
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Bhattacharyya J, Datta AG. Studies on the effects of lipopolysaccharide on lipid peroxidation of erythrocyte and its reversal by mannitol and glycerol. J Physiol Pharmacol 2001; 52:145-52. [PMID: 11321508] [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] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Gram-negative sepsis often produces endotoxin (LPS) which causes infection. Reduction in tissue perfusion due to microcirculatory failure may lead to septic shock. We studied the effect of LPS on lipid peroxidation of erythrocyte. In vitro studies using 50 microg to 250 microg LPS/ml blood showed increased lipid peroxidation of erythrocyte in a dose-dependent manner. The increased effect of lipid peroxidation does not occur with LPS when erythrocytes were washed to remove plasma and leukocytes. Mannitol and glycerol, known scavengers of hydroxyl radical, arrest the elevation in lipid peroxidation of erythrocytes after LPS treatment. Hemolysis of erythrocytes was reduced with low doses of LPS. Plasma lipid peroxidation was elevated after treatment of blood with LPS. From the results we suggest that the peroxidation of erythrocyte lipid caused by LPS may probably play a role in the production of septic shock.
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Affiliation(s)
- J Bhattacharyya
- Indian Institute of Chemical Biology, Jadavpur University, Calcutta
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Banerjee M, Chakrabarti A, Acharya DP, Roy A, Chakrabarty AN, Bhattacharyya J, Dastidar SG. Validity of mechanism of gene transfer in the process called conjugation in bacteria. Indian J Exp Biol 2000; 38:160-6. [PMID: 11218833] [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] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
We have attempted a new evaluation of the process of conjugation in bacteria, because of some basic dissimilarities observed between this and that of eukaryotes, or plants and animals. Reference donor and recipient strains, widely used to prove conjugation in bacteria, were chosen; addition of DNase during the conjugation process, led to an unexpected but highly reproducible increase in the transconjugant colony counts (TCC; ca. > or = 1 log), when compared with that of the controls without DNase. Transconjugants were also obtained when the same live donors were substituted with the UV-killed ones although the TCC was very low initially. Contrarily, donors treated with DNA-intercalating agents, e.g. acridine orange or ethidium bromide, resulted in a complete failure to produce transconjugants. There was a quantitative relationship between the DNase used on donors and levels of DNA sugars/nucleotides/DNA, which possibly resulted from interaction between the DNase and DNA being present/produced on the donor surface. This may be indicative of what may actually happen in the donor-recipient mixtures in the conjugation test proper, where the recipient DNase may activate a donor DNA production cycle. The evidences presented did not suggest that the donor DNA in the conjugation process is actually vestibuled through any intercellular conjugation passages, and is susceptible to the action of DNase or the intercalating dyes.
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Affiliation(s)
- M Banerjee
- Department of Medical Microbiology and Parasitology, Calcutta University College of Medicine, Calcutta 700020, India
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Bhattacharyya J, Chowdhury TD, Datta AG. Effect of endotoxin on protein degradation and lipid peroxidation of erythrocytes. J Physiol Pharmacol 1999; 50:321-6. [PMID: 10424726] [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] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
Sepsis has often been associated with infection due to endotoxin (LPS) produced from gram-negative bacteria. Microcirculatory failure is one of the ultimate causes of septic shock. We studied the effect of endotoxin on the protein breakdown and lipid peroxidation of erythrocyte. In vivo (20 ug LPS/100 g) studies in rats showed increased tyrosine production from erythrocyte, as an index of protein degradation in erythrocyte. In vitro studies using 25 microg to 250 microg LPS per ml also showed similar type of increased effect of endotoxin in protein degradation. Washed erythrocyte devoid of plasma and leucocytes did not show any increased effect after endotoxin treatment. Lipid peroxidation was also increased after endotoxin treatment. However, protein degradation was more prominent than lipid peroxidation. We concluded therefore that the protein degradation and lipid peroxidation of erythrocytes caused by endotoxin are probably related to the production of septic shock.
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Abstract
All molecular chaperones known to date are well organized, folded protein molecules whose three-dimensional structure are believed to play a key role in the mechanism of substrate recognition and subsequent assistance to folding. A common feature of all protein and nonprotein molecular chaperones is the propensity to form aggregates very similar to the micellar aggregates. In this paper we show that alpha(s)-casein, abundant in mammalian milk, which has no well defined secondary and tertiary structure but exits in nature as a micellar aggregate, can prevent a variety of unrelated proteins/enzymes against thermal-, chemical-, or light-induced aggregation. It also prevents aggregation of its natural substrates, the whey proteins. alpha(s)-Casein interacts with partially unfolded proteins through its solvent-exposed hydrophobic surfaces. The absence of disulfide bridge or free thiol groups in its sequence plays important role in preventing thermal aggregation of whey proteins caused by thiol-disulfide interchange reactions. Our results indicate that alpha(s)-casein not only prevents the formation of huge insoluble aggregates but it can also inhibit accumulation of soluble aggregates of appreciable size. Unlike other molecular chaperones, this protein can solubilize hydrophobically aggregated proteins. This protein seems to have some characteristics of cold shock protein, and its chaperone-like activity increases with decrease of temperature.
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Affiliation(s)
- J Bhattacharyya
- Protein Chemistry Laboratory, Department of Chemistry, Bose Institute, Calcutta-700 009, India
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Abstract
alpha-crystallin acts as a molecular chaperone by preventing the aggregation of proteins. Although the mechanism for this activity is not understood there is a proposition that temperature activation at or above 30 degrees C of alpha-crystallin is an absolute requirement, thereby suggesting a conformational transition as a trigger for the activity. In an attempt to unravel the putative temperature-activity relationship, the chaperone-like activity of alpha-crystallin was studied at a number of temperatures above and below 30 degrees C. Chaperone activity was monitored against aggregation of the insulin-B chain induced by cleavage of disulfide bond of insulin and also against photo-aggregation of gamma-crystallin. Contrary to the above notion, the results indicate that alpha-crystallin does not require thermal activation for its chaperone function and that it can efficiently function as a molecular chaperone even at temperatures below the previously reported transition temperature.
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Bhattacharyya J, Bhattacharyya M, Chakraborti AS, Chaudhuri U, Poddar RK. Structural organisations of hemoglobin and myoglobin influence their binding behaviour with phenothiazines. Int J Biol Macromol 1998; 23:11-8. [PMID: 9644592 DOI: 10.1016/s0141-8130(98)00006-3] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [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: 02/07/2023]
Abstract
Binding modalities of chlorpromazine and trifluoperazine, two widely used antipsychotic phenothiazine drugs with hemoglobin and myoglobin have been studied to understand how the quaternary, tertiary and secondary structural organisations of the proteins regulate the binding process. NaCl-induced alteration in the quaternary structure of hemoglobin influences its binding modality with phenothiazines. Minor alterations in the tertiary structure of thermally denatured myoglobin (denaturation temperature ranging between 30-70 degrees C) do not affect its affinity and the modality of binding with the drugs, but alterations in the secondary structure of the protein denatured at temperatures between 70-80 degrees C influence its binding.
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Affiliation(s)
- J Bhattacharyya
- Department of Biophysics, Molecular Biology and Genetics, University College of Science, University of Calcutta, India
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Abstract
Dioflorin (1) was isolated as a minor constituent from the rootbark of Dioclea grandiflora, the crude extract of which demonstrated analgesic activity. The structure of 1 has been determined to be 5,7,2'-trihydroxy-8-methoxy-6-(3-methyl-2-butenyl)flavanone on the basis of spectral analysis.
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Affiliation(s)
- J Bhattacharyya
- Department of Chemistry, University of Georgia, Athens, Georgia 30602, and Laboratorio de Tecnologia Farmacêutica, Universidade Federal da Paraiba, 58.059-João Pessoa, PB, Brazil
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Bhattacharyya J, Sayeed MM. Alterations in intracellular calcium during sepsis. Indian J Physiol Pharmacol 1997; 41:344-52. [PMID: 10235656] [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] [Subscribe] [Scholar Register] [Indexed: 04/13/2023]
Abstract
Tissue injury and/or infection produce significant alterations in intracellular calcium ion regulation. These alterations in cellular calcium has recently been studied following both short term and long term septic model which uses two types of gram-negative bacteria frequently encountered human abdominal sepsis. Changes in calcium flux as well as functional disturbances has been observed in the major organs, specially in skeletal muscle. The changes in calcium flux in different organs were studied using 45Ca exchange, 19F NMR study or by using calcium-fluorescence probes. Calcium-channel blockers attenuate the increased effects of calcium flux. Further anti-cytokines may be useful to prevent septic injury in tissues.
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Bhattacharyya J, Bhattacharyya M, Chakraborti AS, Chaudhuri U, Poddar RK. Trifluoperazine is more effective than chlorpromazine in releasing oxygen from haemoglobin and myoglobin. J Pharm Pharmacol 1996; 48:965-7. [PMID: 8910864 DOI: 10.1111/j.2042-7158.1996.tb06013.x] [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: 02/03/2023]
Abstract
The extent of oxygen release from two heme proteins, haemoglobin and myoglobin have been studied in the presence of trifluoperazine and chlorpromazine (5-1000 microM). At a molar ratio (drug:protein) of 1.5, the release of oxygen from haemoglobin was 4 and 15% in the presence of chlorpromazine and trifluoperazine respectively, while from myoglobin the corresponding values were 20 and 40%. The findings were attributed to the greater extent of local conformational change around tryptophan moieties of each of the proteins induced by trifluoperazine.
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Affiliation(s)
- J Bhattacharyya
- Department of Biophysics, Molecular Biology & Genetics, University of Calcutta, India
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Abstract
An aqueous fraction and dioclein (5,2',5'-trihydroxy-6,7-dimethoxyflavanone) obtained from the ethanolic extract of the Dioclea grandiflora were tested for their analgesic effect in mice and rats employing acetic-induced writhing and tail flick tests, respectively. When administered intraperitoneally the two agents exhibited significant analgesic effects. The activity of both dioclein and aqueous fraction apparently involves an opiate-like mechanism, since their analgesic action was attenuated by naloxone pretreatment.
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Affiliation(s)
- J S Batista
- Laboratório de Tecnologia Farmacêutica, Universidade Federal da Paraíba, Brazil
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Bhattacharyya J, Bhattacaryya A, Hati AK. Visceral leishmaniasis: an anthropometric study. Ann Trop Med Parasitol 1995; 89:83-4. [PMID: 7741599 DOI: 10.1080/00034983.1995.11812933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- J Bhattacharyya
- Department of Medical Entomology, Calcutta School of Tropical Medicine, India
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Bhattacharyya J, Bhattacharyya M, Chakrabarty AS, Chaudhuri U, Poddar RK. Interaction of chlorpromazine with myoglobin and hemoglobin. A comparative study. Biochem Pharmacol 1994; 47:2049-53. [PMID: 8010989 DOI: 10.1016/0006-2952(94)90080-9] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.2] [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: 01/28/2023]
Abstract
The mode and nature of the binding of chlorpromazine (CPZ), a psychotropic drug, with myoglobin, a monomeric muscle protein, were studied spectrofluorometrically and the results compared with those from the binding of CPZ to hemoglobin, a tetrameric allosteric protein from red blood cells (RBC). CPZ interacted with myoglobin in a non-cooperative mode, with a binding constant of 8.4 x 10(3) M-1 in 0.145 M NaCl, pH 6.8, whereas in the case of hemoglobin this interaction was found to be positively cooperative with a binding constant of 4.2 x 10(3) M-1. The interaction of CPZ with myoglobin was not influenced by the NaCl molarity of the solution, whereas CPZ interaction with hemoglobin significantly decreased with increasing NaCl molarity, indicating that CPZ-hemoglobin binding is mostly electrostatic in nature, whereas that of the CPZ-myoglobin complex is of a non-electrostatic type. Thermodynamic analysis revealed that binding of CPZ to hemoglobin was exothermic (delta H degrees = -2.65 kcal/mol), whereas binding to myoglobin was endothermic (delta H degrees = + 1.39 kcal/mol) with a high entropic contribution (delta S degrees = +23 cal/degree/mol), suggesting that CPZ binding to myoglobin is hydrophobic in nature. Such contrasting binding features of this drug have been discussed in the light of a typical subunit interaction property present and absent in hemoglobin and myoglobin, respectively.
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Affiliation(s)
- J Bhattacharyya
- Department of Biophysics, Molecular Biology and Genetics, University of Calcutta, India
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Hati AK, Bhattacharyya J, Mukherjee H, Ghosh S, Das DC. Pattern of D-xylose excretion test in kala-azar patients. J Indian Med Assoc 1993; 91:267. [PMID: 8308312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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Abstract
Membrane Ca2+ flux and net protein catabolism were studied in the skeletal muscle during experimental sepsis. Sterilized rat fecal pellets with (septic) or without (sterile) gram-negative bacteria, Escherichia coli [10(2) colony-forming units (cfu)] and Bacteroides fragilis (2 x 10(3) cfu), were implanted into the abdomens of male Sprague-Dawley rats (110-120 g). Septic and sterile rats were febrile and hyperlactacidemic on day 1 postimplantation. These responses subsided by day 2 in sterile but not septic rats. Initial Ca2+ flux, estimated from measurements of 45Ca uptake by soleus muscles in vitro, was elevated on day 1 in both sterile and septic rats and on day 2 and 3 in septic rats only. The septic rat soleus muscle showed a significantly increased net protein catabolic response (measured as tyrosine release by soleus muscle, in vitro) over that found in muscles of sterile rats on day 1-3 postimplantation. The increase in Ca2+ flux in septic (day 1-3 postimplantation) and sterile (day 1 only) rats was abolished when the rats were treated with the calcium channel blocker diltiazem. In unoperated control rat soleus muscles the Ca2+ ionophore, ionomycin, concomitantly caused an increase in Ca2+ flux and net protein catabolism. Overall, the present study suggested that altered cellular Ca2+ regulation plays a role in the net protein catabolic response in the skeletal muscle during sepsis.
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Affiliation(s)
- J Bhattacharyya
- Department of Physiology, Loyola University of Chicago, Stritch School of Medicine, Maywood, Illinois 60153
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Hati AK, Sur S, De N, Dwivedi HN, Bhattacharyya J, Mukherjee H, Chandra G. Longitudinal study on distribution of Phlebotomus argentipes sandflies at different heights in cattleshed. Indian J Med Res 1991; 93:388-90. [PMID: 1797650] [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: 12/28/2022] Open
Abstract
Distribution of Ph. argentipes at three levels (level I, 0-0.91 m; level II, 0.91-1.82 m; and level III 1.82-2.74 m) above the ground in 6 cattlesheds was studied during July 1989 to June 1990. Of the 8044 Ph. argentipes caught, 3151 (39.2%), 3936 (48.9%) and 957 (11.9%) were from levels I, II, and III respectively. Both male and fed, half-fed, gravid and unfed female sandflies were found at all the three levels and in all the three seasons viz., rainy, winter and summer, of the year. The maximum height of occurrence of sandflies was 2.51 m (8.3 ft) above the ground level.
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Affiliation(s)
- A K Hati
- Department of Medical Entomology, Calcutta School of Tropical Medicine, India
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Barbosa-Filho JM, Agra MF, Oliveira RA, Paulo MQ, Trolin G, Cunha EV, Ataide JR, Bhattacharyya J. Chemical and pharmacological investigation of Solanum species of Brazil--a search for solasodine and other potentially useful therapeutic agents. Mem Inst Oswaldo Cruz 1991; 86 Suppl 2:189-91. [PMID: 1841999 DOI: 10.1590/s0074-02761991000600043] [Citation(s) in RCA: 10] [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: 03/26/2023] Open
Abstract
A systematic search for solasodine, an important starting material for the partial synthesis of steroidal hormones as well as other potentially bioactive constituents of various Solanum species of Brazil has been undertaken. Thus, the fruits of S. paludosum, S. asperum, S. sessiliflorum and Solanum sp. were found to contain significant amounts of solasodine. The root bark of S. paludosum which showed curare like activity yielded tomatidenol and another yet unidentified alkaloid responsible for the biological activity. The fruits of S. asperum yielded a new spirosolane alkaloid, solaparnaine. The stem bark of S. pseudo-quina showed convulsive and excitatory activity from which (25S)-isosolafloridine was identified as the active principle. In addition, the latter alkaloid was also found to show antimicrobial activity.
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Affiliation(s)
- J M Barbosa-Filho
- Laboratório de Tecnologia Farmacêutica, Universidade Federal da Paraíba, João Pessoa, Brasil
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Bhattacharyya J, Saha SK, Guhaniyogi SC. Aqueous polymerization on clay surfaces. V. Role of lattice substituted iron in montmorillonite in polymerizing methyl methacrylate in the presence of thiourea. ACTA ACUST UNITED AC 1990. [DOI: 10.1002/pola.1990.080280902] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Abstract
The serum protease inhibitor alpha 1-AT was measured in patients with different types of cancer and compared with that of normal human serum. alpha 1-AT levels, as measured by its trypsin inhibitory capacity and the immunodiffusion technique, showed significant increase (P less than 0.05 and P less than 0.001, respectively) in cervical cancer patients. The results indicates that levels of alpha 1-AT may have a direct relationship with cervical cancer condition.
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Banerjee PN, Bhattacharyya J, Datta A, Datta AG. The effect of submaxillariectomy on the uterine peroxidase activity and [14C]phenylalanine incorporation into uterine protein in rats. Acta Endocrinol (Copenh) 1987; 114:208-13. [PMID: 3030035 DOI: 10.1530/acta.0.1140208] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Surgical removal of submaxillary glands in immature female rats caused an increase in size and about 3-fold increase in dry and wet weight of the uterus compared to that of the sham operated animals of the same age group. Histological examination reveal a significant increase in the diameter of the uterus with considerable elongation of the luminal epithelium from cubical to columnar in the experimental group. Biochemical studies showed that the uterine peroxidase, a marker enzyme for oestrogen action, increased (P less than 0.01) on submaxillariectomy. Incorporation of [14C]phenylalanine into the nuclear fraction of uterus was also enhanced significantly on removal of submaxillary glands. The elevation of peroxidase activity as well as of [14C]phenylalanine incorporation into the nuclear fraction due to removal of submaxillary glands were abolished in ovariectomized rats suggesting the involvement of ovarian hormones. The results show that oestrogen was responsible for all the above mentioned changes, whereas progesterone had little effect. Results further suggest the existence of a factor in the submaxillary glands through which they exert an effect on the uterus and ovary.
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Abstract
Cold exposure of rats for 3 h (6 +/- 2 degrees C) caused an increase in amylase activity of the submaxillary gland. This effect was not observed in other salivary glands i.e. parotid and sublingual or in the pancreas. The increase of amylase activity during cold exposure was completely abolished by the beta-receptor antagonist, propranolol, and the alpha-receptor antagonist, phenoxybenzamine, reduced the effect. Administration of actinomycin D to the cold-exposed rats produced a tremendous increase of enzyme activity instead of abolition of the increase as had been expected.
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Bhattacharyya J, Chaudhturi S, Pal AK. Studies on the optical properties and the burstein-moss shift inindium tin oxide films. ACTA ACUST UNITED AC 1986. [DOI: 10.1002/pssa.2210950130] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Bhattacharyya J, Banerjee PN, Datta A, Datta AG. Uterine changes on removal of submaxillary glands in rats (histological changes/uterine peroxidase/blood estradiol level). Biochem Biophys Res Commun 1985; 133:462-7. [PMID: 3002343 DOI: 10.1016/0006-291x(85)90929-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Surgical removal of submaxillary gland in immature rats causes a large increase in size and about three to four fold increase in dry and wet weight of uterus compared to that of the sham operated animals of the same age group. Histological examination reveals a significant increase in the diameter of the uterus with considerable elongation of the luminal epithelium from cubical to columnar in the experimental group. Biochemical studies show that the uterine peroxidase (donor: hydrogen-peroxide oxidoreductase, EC 1.11.1.7), a marker enzyme for uterine growth, increases by ten to fifteen fold on submaxillariectomy and returns almost to the normal level on administration of submaxillary gland extract (105,000 X g supernatant) to the submaxillariectomized animals. Estrogen estimation by radioimmunoassay shows a similar increase of three to four fold on removal of submaxillary glands and decrease almost to the normal value on administration of the submaxillary extract.
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