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Horgan C, Bitetti S, Newbould M, Sethuraman C, Fagbemi A, Kala A, Williams N, Wynn R. Non-Graft-versus-Host Disease Enterocolitis Following Cord Blood Transplantation is Real, with Poorly Understood Pathophysiology, and Requires Distinct Management, with Eventual Resolution without Immune Suppression. Transplant Cell Ther 2024; 30:440.e1-440.e9. [PMID: 38052367 DOI: 10.1016/j.jtct.2023.11.023] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Revised: 11/14/2023] [Accepted: 11/28/2023] [Indexed: 12/07/2023]
Abstract
Enterocolitis is common after cord blood transplantation (CBT) and a specific, non-graft-versus-host disease (GVHD) entity with specific histopathologic features ("cord colitis") has been described in some cases in selected series. Immune suppression is not without risk, and we have used it only when biopsy features are consistent with classical GVHD. In the absence of biopsy features of classical GVHD, our management of intestinal failure has been supportive, and we have withdrawn immune suppression to allow immune reconstitution and better prevent relapse of malignant disease and reduce infectious complications. We evaluated our approach over an 11-year period in a retrospective study of all patients at our large pediatric CBT center who experienced intestinal failure necessitating endoscopy and biopsy in the post-CBT period. We conducted a blinded histopathologic review of gastrointestinal (GI) biopsy specimens from all patients who had undergone GI endoscopy for intestinal failure in the post-CBT period. Patient records were evaluated to determine clinical HSCT course and outcome data, including mortality, relapse, and infection, as well as the duration of immune suppression and parenteral nutrition. Out of 144 patients who underwent CBT during the study period, 25 (17%) experienced intestinal failure requiring endoscopy. Thirteen patients were diagnosed with acute GVHD after blinded review of biopsy specimens, and 12 patients had non-GVHD enterocolitis. Management in the absence of GVHD on GI biopsy is supportive, with withdrawal of immune suppression in patients with malignant disease and continuing in accordance with institutional practice in those with nonmalignant disease. Compared with the GVHD cohort, the non-GVHD enterocolitis cohort had superior overall survival (91% versus 41%; P = .04) and a shorter duration of immune suppression (mean, 112 days versus 180 days; P = .049), reflecting these different management approaches. These results demonstrate that different histopathologic findings in those with intestinal failure after CBT likely indicates a different etiology from GVHD and mandates a different clinical management strategy to achieve optimal clinical outcomes.
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Affiliation(s)
- Claire Horgan
- Department of Paediatric Bone Marrow Transplant and Cellular Therapy, Royal Manchester Children's Hospital, Manchester University NHS Foundation Trust, Manchester, United Kingdom
| | - Stefania Bitetti
- Department of Paediatric Histopathology, Royal Manchester Children's Hospital, Manchester University NHS Foundation Trust, Manchester, United Kingdom
| | - Melanie Newbould
- Department of Paediatric Histopathology, Royal Manchester Children's Hospital, Manchester University NHS Foundation Trust, Manchester, United Kingdom
| | - Chitra Sethuraman
- Department of Paediatric Histopathology, Royal Manchester Children's Hospital, Manchester University NHS Foundation Trust, Manchester, United Kingdom
| | - Andrew Fagbemi
- Department of Paediatric Gastroenterology, Royal Manchester Children's Hospital, Manchester University NHS Foundation Trust, Manchester, United Kingdom
| | - Adnan Kala
- Department of Paediatric Gastroenterology, Royal Manchester Children's Hospital, Manchester University NHS Foundation Trust, Manchester, United Kingdom
| | - Nicola Williams
- Department of Paediatric Bone Marrow Transplant and Cellular Therapy, Royal Manchester Children's Hospital, Manchester University NHS Foundation Trust, Manchester, United Kingdom
| | - Robert Wynn
- Department of Paediatric Bone Marrow Transplant and Cellular Therapy, Royal Manchester Children's Hospital, Manchester University NHS Foundation Trust, Manchester, United Kingdom.
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Sarkar VK, De UK, Kala A, Chauhan A, Verma AK, Paul BR, Soni S, Chaudhuri P, Patra MK, Gaur GK. Effects of oral probiotic and lactoferrin interventions on iron-zinc homeostasis, oxidant/antioxidant equilibrium and diarrhoea incidence of neonatal piglets. Benef Microbes 2023:1-12. [PMID: 37026367 DOI: 10.3920/bm2022.0032] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/08/2023]
Abstract
The objective of this study was to examine the effects of early-life host specific probiotic and lactoferrin (LF) supplementations on diarrhoea incidence, iron (Fe)-zinc (Zn) balance and antioxidant capabilities in serum of neonatal piglets. A total of eight sow litters obtained from parity matched sows were randomly divided into four groups and assigned to one of the four interventions: control (2.0 ml normal saline), bovine lactoferrin (bLF) (100 mg bLF in normal saline), probiotic (Pb) (1×109 cfu of swine origin Pediococcus acidilactici FT28 strain) and bLF+Pb (both 100 mg bLF and 1×109 cfu of P. acidilactici FT28). All the piglets received supplementations once daily orally for first 7 days of life. The incidence of diarrhoea markedly decreased in bLF group compared to control group. Notably, no incidences of diarrhoea were recorded in Pb and bLF+Pb groups. The Zn and Fe concentrations were significantly increased from day 7 to 21 in bLF and on day 21 in bLF+Pb group. No such changes were noted in Pb group. Total antioxidant capacity (TAC) in serum was significantly increased on days 7 and 15 in bLF group and on days 7 and 21 in bLF+Pb group. Malonaldehyde concentration was markedly reduced from day 7 to 21 in bLF and bLF+Pb groups. The concentrations of nitrate on days 15 and 21 and malonaldehyde on day 7 were significantly higher in Pb group, but mean TAC was unaltered from day 0 to 21. Although no correlation between the incidence of diarrhoea and Zn/Fe and oxidant/antioxidant homeostasis was noted in the Pb group, the supplementation of P. acidilactici FT28 alone was sufficient to prevent the incidence of diarrhoea in neonatal piglets. Taken together, it is concluded that strategic supplementation of P. acidilactici FT28 in early life could help in preventing diarrhoea until weaning of piglets.
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Affiliation(s)
- V K Sarkar
- Division of Medicine, ICAR-Indian Veterinary Research Institute, Izatnagar 243122 (UP), India
| | - U K De
- Division of Medicine, ICAR-Indian Veterinary Research Institute, Izatnagar 243122 (UP), India
| | - A Kala
- Division of Animal Nutrition, ICAR-Indian Veterinary Research Institute, Izatnagar 243122 (UP), India
| | - A Chauhan
- Livestock Production and Management Section, ICAR-Indian Veterinary Research Institute, Izatnagar 243122 (UP), India
| | - A K Verma
- Division of Animal Nutrition, ICAR-Indian Veterinary Research Institute, Izatnagar 243122 (UP), India
| | - B R Paul
- Division of Medicine, ICAR-Indian Veterinary Research Institute, Izatnagar 243122 (UP), India
| | - S Soni
- Division of Medicine, ICAR-Indian Veterinary Research Institute, Izatnagar 243122 (UP), India
| | - P Chaudhuri
- Division of Biological Products, ICAR-Indian Veterinary Research Institute, Izatnagar 243122 (UP), India
| | - M K Patra
- Livestock Production and Management Section, ICAR-Indian Veterinary Research Institute, Izatnagar 243122 (UP), India
| | - G K Gaur
- Livestock Production and Management Section, ICAR-Indian Veterinary Research Institute, Izatnagar 243122 (UP), India
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Kala A, Ganesh Vaidyanathan S, Sharon Femi P. CEEMDAN hybridized with LSTM model for forecasting monthly rainfall. IFS 2022. [DOI: 10.3233/jifs-213064] [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: 11/15/2022]
Abstract
The risks of severe weather events due to climate changes, including droughts and floods require accurate and timely forecasting of rainfall. But, the rainfall time series contains nonlinear and non-stationary data which lowers the model performance. This paper attempts to solve the nonlinear and non-stationary challenges imposed by the rainfall forecasting models by building a hybrid model based on complete ensemble empirical mode decomposition with Adaptive Noise(CEEMDAN) combined with long short-term memory (LSTM) for forecasting All India monthly rainfall. For monthly rainfall forecasting, homogeneous Indian monthly rainfall time series dataset (1871–2016) is used. Complete ensemble empirical mode decomposition decomposes the rainfall time series data into Intrinsic Mode Functions (IMF) and residual element. Each IMF and residual is forecasted using the LSTM after determining the significant lags. The forecasted intrinsic mode functions and the residual elements are reconstructed to obtain the forecasted rainfall value. The proposed model performance has been verified against existing models. Compared with single LSTM model, the forecasted values prove that the model achieves good performance in predicting monthly rainfall time series.
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Affiliation(s)
- A. Kala
- Department of Information Technology, Sri Venkateswara College of Engineering, Sriperumbudur, India
| | - S. Ganesh Vaidyanathan
- Department of Electronics and Communication Engineering, Sri Venkateswara College of Engineering, Sriperumbudur, India
| | - P. Sharon Femi
- Department of Information Technology, Sri Venkateswara College of Engineering, Sriperumbudur, India
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Kala A, Kumar M, Chaudhary L, Agarwal N. Development and comparative evaluation of microencapsulated and lyophilized probiotic Lactobacillus acidophilus under In vitro conditions. ANIM NUTR FEED TECHN 2022. [DOI: 10.5958/0974-181x.2022.00005.1] [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: 10/17/2022]
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Kumar M, Kala A, Chaudhary LC, Agarwal N, Kochewad SA. Microencapsulated and Lyophilized Lactobacillus acidophilus Improved Gut Health and Immune Status of Preruminant Calves. Probiotics Antimicrob Proteins 2021; 14:523-534. [PMID: 34286420 DOI: 10.1007/s12602-021-09821-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 07/08/2021] [Indexed: 11/28/2022]
Abstract
The present study was conducted to study the effect of microencapsulated, lyophilized, or fermented milk using Lactobacillus acidophilus NCDC15 as a probiotic to improve gut health, growth, nutrient utilization, and immunity status of young crossbred calves. The viable culture of L. acidophilus was used for preparation of different probiotic forms/products. To compare the efficacy of probiotic products, twenty crossbred calves (3-day old) were divided into four groups (n = 5), control (C), fed only milk and basal diet, and treatment groups, supplemented with microencapsulated, fermented, and lyophilized probiotic at 108 colony-forming units, respectively. Probiotic-supplemented groups showed reduction in faecal score, faecal pH, and ammonia concentration as compared to control indicating decreased diarrheal incidence. There was an increase (P < 0.05) in the concentration of faecal lactate and butyrate in the probiotic-supplemented groups. The faecal count (log10 (CFU)/g of fresh faeces) of lactobacilli and bifidobacteria was higher (P < 0.05), whereas faecal coliforms and clostridia count were reduced (P < 0.001) in all the probiotic fed groups as compared to control. The cell-mediated immunity was improved (P < 0.05) in the microencapsulated and fermented probiotic groups. However, there was no effect on the nutrient utilization, average daily gain, and blood biochemical profile. Therefore, it is concluded that the fermented, microencapsulated and lyophilized probiotic products were superior in improving the gut health in terms of its microbiota and metabolites and cell-mediated immunity response in calves, irrespective of form of probiotic. The increased population of Lactobacillus and Bifidobacterium decreased the colonization of the gut by pathogens such as Escherichia coli and Clostridium by exclusion and production of organic acids in the intestine. This decreased the diarrhoeal incidence (1.3 vs 1.8) and days in diarrhoea (3.9 vs 5.8) in calves in probiotic fed groups as compared to control.
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Affiliation(s)
- M Kumar
- Animal Nutrition Division, Indian Veterinary Research Institute, Izatnagar, Bareilly, 243122, UP, India
| | - A Kala
- Animal Nutrition Division, Indian Veterinary Research Institute, Izatnagar, Bareilly, 243122, UP, India.
| | - L C Chaudhary
- Animal Nutrition Division, Indian Veterinary Research Institute, Izatnagar, Bareilly, 243122, UP, India
| | - N Agarwal
- Animal Nutrition Division, Indian Veterinary Research Institute, Izatnagar, Bareilly, 243122, UP, India
| | - S A Kochewad
- Livestock Production and Management Section, Indian Veterinary Research Institute, Izatnagar, 243122, UP, India
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Burel C, Kala A, Purevdorj-Gage L. Impact of pH on citric acid antimicrobial activity against Gram-negative bacteria. Lett Appl Microbiol 2020; 72:332-340. [PMID: 33099798 PMCID: PMC7984346 DOI: 10.1111/lam.13420] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 10/20/2020] [Accepted: 10/20/2020] [Indexed: 02/06/2023]
Abstract
The antimicrobial activity of citric acid (CA) is often evaluated without pH adjustment or control and its impact on micro‐organisms is better understood in acidic conditions. However, the biocidal action of the fully ionized CA molecule, predominantly available at higher pH, has not been previously investigated. The objective of this study was to evaluate the antimicrobial effect of high (10%) and low (1%) concentrations of CA, each adjusted over a wide range of pH values (4·5, 6·5 and 9·5) relative to the controls exposed to corresponding pH levels alone (no CA). The viability and morphology of Escherichia coli and Klebsiella aerogenes were evaluated using a culture‐based enumeration assay in parallel with direct SEM imaging. Overall, the highest membrane damage and loss in viability were achieved with 10% CA at pH 9·5, which yielded at least 4·6 log10 CFU per ml (P < 0·001) reductions in both organisms. Insight into the superior efficacy of CA at high pH is proposed based on zeta potential measurements which reveal a more negatively charged bacterial surface at higher pH. This pH‐dependent increase in surface charge may have rendered the cells potentially more sensitive towards chelants such as CA3− that interact with membrane‐stabilizing divalent metals.
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Affiliation(s)
- C Burel
- Complex Assemblies of Soft Matter Laboratory (COMPASS), CNRS-Solvay-University of Pennsylvania, CRTB, Bristol, PA, USA
| | - A Kala
- Complex Assemblies of Soft Matter Laboratory (COMPASS), CNRS-Solvay-University of Pennsylvania, CRTB, Bristol, PA, USA
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Suchitra J, Kala A, Sagadevan S, Bharathi Devi V, Podder J. Synthesis and characterisation of bis(2 methyl-8-hydroxyquinoline) zinc nanoparticles for organic light emitting diode applications. Molecular Simulation 2019. [DOI: 10.1080/08927022.2019.1594418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- J.P. Suchitra
- Department of Physics, Government Arts College for Men, Nandhanam, Chennai, India
- Department of Physics, Dr. M.G.R. Educational and Research Institute, Chennai, India
| | - A. Kala
- Department of Physics, Government Arts College for Men, Nandhanam, Chennai, India
| | - Suresh Sagadevan
- Nanotechnology & Catalysis Research Centre, University of Malaya, Kuala Lumpur, Malaysia
| | - V. Bharathi Devi
- Nanotechnology & Catalysis Research Centre, University of Malaya, Kuala Lumpur, Malaysia
| | - Jiban Podder
- Department of Physics, Bangladesh University of Engineering & Technology, Dhaka, Bangladesh
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Vinitha MV, Najeeb PK, Kala A, Bhatt P, Safvan CP, Vig S, Kadhane U. Plasmon excitation and subsequent isomerization dynamics in naphthalene and azulene under fast proton interaction. J Chem Phys 2018; 149:194303. [DOI: 10.1063/1.5046464] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- M. V. Vinitha
- Department of Physics, Indian Institute of Space Science and Technology, Thiruvananthapuram 695547, India
| | - P. K. Najeeb
- Department of Physics, Indian Institute of Space Science and Technology, Thiruvananthapuram 695547, India
| | - A. Kala
- Department of Physics, Indian Institute of Space Science and Technology, Thiruvananthapuram 695547, India
| | - P. Bhatt
- Inter-University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - C. P. Safvan
- Inter-University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - S. Vig
- Department of Earth and Space Science, Indian Institute of Space Science and Technology, Trivandrum 695547, India
| | - U. Kadhane
- Department of Physics, Indian Institute of Space Science and Technology, Thiruvananthapuram 695547, India
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Bennett WD, Kala A, Duckworth H, Zeman KL, Wu J, Henderson A, Yopp M, Rubin BK. Effect of a single 1200 Mg dose of Mucinex® on mucociliary and cough clearance during an acute respiratory tract infection. Respir Med 2015; 109:1476-83. [PMID: 26462765 DOI: 10.1016/j.rmed.2015.09.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Revised: 08/21/2015] [Accepted: 09/30/2015] [Indexed: 11/15/2022]
Abstract
BACKGROUND Observational studies suggest that orally administered guaifenesin (GGE) may thin lower respiratory tract secretions but none have examined its effects on mucociliary and cough clearance (MCC/CC) during a respiratory tract infection (RTI). The current study was a randomized, parallel-group, double-blind, placebo-controlled study in non-smoking adults who suffered from an acute upper RTI. METHODS We assessed the effects of a single dose of Mucinex(®) 1200 mg (2 × 600 mg extended release tablets) (ER GGE) on 1) MCC/CC by assessing the rate of removal from the lung of inhaled radioactive tracer particles (Tc99m-sulfur colloid), 2) sputum dynamic rheology by stress/strain creep transformation over the linear part of the curve, 3) sessile drop interfacial tension by the deNouy ring technique, and 4) subjective symptom measures. MCC was measured during the morning (period 1) and compared to that in the afternoon 4 h later (period 2) immediately following either drug (n = 19) or placebo (n = 19). For both period 1 and 2 subjects performed 60 voluntary coughs from 60 to 90 min after inhalation of radio-labeled aerosol for a measure of CC. Sputum properties were measured from subjects who expectorated sputum during the cough period post treatment (n = 8-12 for each cohort). RESULTS We found no effect of ER GGE on MCC or CC compared to placebo. MCC through 60 min for period 1 vs. 2 = 8.3 vs. 11.8% (placebo) and = 9.7 vs. 11.1% (drug) (NS) and CC for period 1 vs. 2 was 9.9 vs. 9.1% (placebo) and 10.8 vs. 5.6% (drug) (NS). There was no significant difference in sputum biophysical properties after administration of drug or placebo. CONCLUSIONS There was no significant effect of a single dose of ER GGE on MCC/CC or on sputum biophysical properties compared to placebo in this population of adult patients with an acute RTI. ClinicalTrials.gov Identifier: NCT01114581.
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Affiliation(s)
- W D Bennett
- Center for Environmental Medicine, Asthma, and Lung Biology, University of North Carolina at Chapel Hill, USA; Dept of Medicine, University of North Carolina at Chapel Hill, USA.
| | - A Kala
- Center for Environmental Medicine, Asthma, and Lung Biology, University of North Carolina at Chapel Hill, USA
| | - H Duckworth
- Center for Environmental Medicine, Asthma, and Lung Biology, University of North Carolina at Chapel Hill, USA
| | - K L Zeman
- Center for Environmental Medicine, Asthma, and Lung Biology, University of North Carolina at Chapel Hill, USA
| | - J Wu
- Center for Environmental Medicine, Asthma, and Lung Biology, University of North Carolina at Chapel Hill, USA
| | - A Henderson
- Dept of Medicine, University of North Carolina at Chapel Hill, USA
| | - M Yopp
- Children's Hospital of Virginia, Virginia Commonwealth University, USA
| | - B K Rubin
- Children's Hospital of Virginia, Virginia Commonwealth University, USA
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Dhatchanamoorthy N, Raja P, Soosairaj S, Kala A. Sida ravii Sivad. & Anil Kumar (Malvaceae) a new record from Tamilnadu, India. J Threat Taxa 2015. [DOI: 10.11609/jott.o3581.7716-9] [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: 11/27/2022] Open
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Raja P, Soosairaj S, Dhatchanamoorthy N, Kala A. A new distribution record for the Critically Endangered Madura Swampweed Hygrophila madurensis (N.P. Balakr. & Subr.) Karthik. & Moorthy (Acanthaceae). J Threat Taxa 2015. [DOI: 10.11609/jott.o4015.7581-3] [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: 11/27/2022] Open
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Abstract
For the first time, cells have been patterned on surfaces through the spatial manipulation of native gene expression. By manipulating the inherent biology of the cell, as opposed to the chemical nature of the surfaces they are attached to, we have created a potentially more flexible way of creating patterns of cells that does not depend on the substrate. This was accomplished by bringing an siRNA that targets the expression of pten under the control of light, by modifying it with photocleavable groups. This pten-targeting siRNA has been previously demonstrated to induce dissociation of cells from surfaces. We modified this siRNA with dimethoxy nitro phenyl ethyl photocleavable groups (DMNPE) to allow the activity of the siRNA, and hence pten knockdown, to be toggled with light. Using this approach we demonstrated light dependent cell dissociation only with a DMNPE modified siRNA that targets pten and not with control siRNAs. In addition we demonstrated the ability to make simple patterns of cells through the application of masks during irradiation.
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Affiliation(s)
- A Kala
- Division of Pharmaceutical Sciences, School of Pharmacy, University of Missouri, 2464 Charlotte Street, Kansas City, MO 64108-2718, USA.
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Gunasekaran S, Natarajan RK, Kala A. FTIR spectra and mechanical strength analysis of some selected rubber derivatives. Spectrochim Acta A Mol Biomol Spectrosc 2007; 68:323-30. [PMID: 17320472 DOI: 10.1016/j.saa.2006.11.039] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2006] [Revised: 11/20/2006] [Accepted: 11/30/2006] [Indexed: 05/14/2023]
Abstract
Rubber materials have wide range of commercial applications such as, infant diapers, famine hygiene products, drug delivery devices and incontinency products such as rubber tubes, tyres, etc. In the present work, studies on mechanical properties of some selected rubber materials viz., natural rubber (NR), styrene butadiene rubber (SBR), nitrile butadiene rubber (NBR) and ethylene propylene diene monomer (EPDM) have been carried out in three states viz., raw, vulcanized and reinforced. To enhance the quality of rubber elastomers, an attempt is made to prepare new elastomers called polyblends. In the present study an attempt is made to blend NR with NBR and with EPDM. We here report, a novel approach for the evaluation of various physico-mechanical properties such as mechanical strength, tensile strength, elongation and hardness. The method is simple, direct and fast and involves infrared spectral measurements for the evaluation of these properties. With the applications of modern infrared spectroscopy, the mechanical strength of these rubber materials have been analyzed by calculating the internal standards among the methyl and methylene group vibrational frequencies obtained from FTIR spectroscopy. Also the tensile strength measurements carried out by universal testing machine. The results pertaining physico-mechanical properties of the rubber derivatives undertaken in the present study obtained by IR-based method are in good agreement with data resulted from the standard methods.
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Affiliation(s)
- S Gunasekaran
- PG & Research Department of Physics, Pachaiyappa's College, Chennai 600 030, India
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Hanke I, Garajová B, Korsa M, Procházka V, Kala A. [Utilization of continuous elimination methods at the surgical ICU]. Rozhl Chir 2006; 85:570-2. [PMID: 17323550] [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: 05/14/2023]
Abstract
The authors inform about the causes of introduction and use of continuous veno-venous hemofiltration at theirs intensive care unit. They describe in details this technique. They present theirs experience in this field and give the overview of the development of its indication in the last years. Based on group of 46 patient results, they recommend implementation of this technique to intensive care units, where surgical patients with organ insufficiency are treated as highly positive and essential.
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Kala A, Prakash J. Nutrient Composition and Sensory Profile of Differently Cooked Green Leafy Vegetables. International Journal of Food Properties 2004. [DOI: 10.1081/jfp-200033079] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Kala A, Mitra AG, Ramakrishnan P. Elevation of glucose-6-phosphate dehydrogenase levels in alloxan diabetic mice by Bordetella pertussis cell extract. Indian J Biochem Biophys 1988; 25:413-5. [PMID: 3243559] [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: 01/04/2023]
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