- A. Bhattacharya
- K. Das
- A. V. Muruganandam
- K. Sairam
- K. Gulati
- A. Ray
- P. K. Debnath
- V. N. Nijampurkar
- R. V. Krishnamurthy
- S. M. Mathur
- R. Ramesh
- K. Gopalan
- P. S. Datta
- P. Mookerjee
- S. K. Tyagi
- R. A. Jani
- S. C. Tripathi
- T. C. Lahiri
- A. Roy
- A. Sarkar
- H. Ozaki
- M. Ebihara
- S. Sarangi
- A. K. Ray
- K. S. Subramanian
- Prosenjit Ghosh
- A. Chakrabarti
- M. M. Sarin
- Minati Roy
- R. Dhana Raju
- A. K. Bandyopadhyay
- S. C. Basu
- V. V. Mandke
- M. Adithan
- B. S. Rathore
- P. D. Kulkarni
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Bhattacharya, S. K.
- Further Investigations on the Antioxidant Activity of Ocimum sanctum Using Different Paradigms of Oxidative Stress in Rats
Authors
Source
Journal of Natural Remedies, Vol 1, No 1 (2001), Pagination: 6-16Abstract
Objective : To extend the investigations on the reported antioxidant activity of Ocimum sanctum. Materials and methods : The oxidative stress parameters used in rats were the isolated heart ischaemia-reperfusion injury, chronic (28 days) exposure to cigarette smoke, chronic footshock stress (21 days) and iron-overload hepatotoxicity. The parameters of oxidative stress included the estimation of the antioxidant enzymes, superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPX), and lipid peroxidation (LPO). A standardized extract of O. Sanctum (OS) and vitamin E (VE), a standard antioxidant agent, were used as the test drugs. Results : OS (50 and 100 mg/kg, p.o.) and VE (200 mg/kg, p.o.) administered for 5 days prior to induction of ischaemia-reperfusion reversed the depletion of SOD, CAT and GPX, and the increase in LPO induced in heart by this model of oxidative stress. Likewise, both OS (50 and 100 mg/kg, p.o.) and VE (200 mg/kg, p.o.), administered for 28 days, concomitant with exposure to cigarette smoke (CS) reversed the changes induced by CS in rat heart and lung SOD, CAT, GPX and LPO. A similar effect was noted when these doses of OS and VE were administered for 21 days along with exposure to chronic stress induced oxidative stress in rat brain frontal cortex and striatum. Iron overload induced increase in hepatic lipid peroxidation was attenuated by these doses of OS and VE, administered for 5 days prior to iron overload. Conclusion : OS exhibited significant antioxidant activity against several paradigms of oxidative stress induced by a variety of techniques in different rat tissues, which was comparable to that induced by VE. The results confirm the antioxidant activity of OS and indicate that, like VE, it is not tissue specific. It also provides a basis for the clinical use of OS in several clinical conditions involving oxidative stress.Keywords
Ocimum Sanctum, Vitamin E, Oxidative Stress, Antioxidant Action- Immunomodulatory Indian Medicinal Plants
Authors
Source
Journal of Natural Remedies, Vol 2, No 2 (2002), Pagination: 121-131Abstract
The traditional Indian system of medicine (Ayurveda) describes different modalities involved in the prevention and treatment of disease and stresses upon the role of diet, life style and drugs as cornerstones of therapy. Medicinal plant products are known to modify different aspects of human physiology and exert an alleviating influence on several pathophysiological states, and concepts of immunity and immunomodulation can be traced back several hundred years to the history of medicine. However, it is only in recent years that the scientific concept of immunomodulation has been forwarded, and it now appears that some of the beneficial effects of Indian medicinal plants, proposed in Ayurveda by Charaka and Sushruta Samhita, may be due to these "immunomodulatory" effects. Several research groups have worked on the scientific basis of such immunomodulatory effects of plant products, and as a result, considerable data has accrued. The present review summarizes some of these experimental data in an attempt to justify some of their beneficial effects in health and disease, and also to provide insights into the future research in this area.Keywords
Immunomodulation, Indian Medicinal Plants- Oxygen Isotopic Studies of Ice, Snow and Water Samples near the Indian Stations in Antarctica
Authors
1 Physical Research Laboratory, Ahmedabad, 380 009, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 51, No 3 (1998), Pagination: 399-404Abstract
Oxygen isotopic ratios in water samples collected from various sources (recent snow, glacier ice, coastal sea, lakes etc.) near the two Indian stations in Antarctica (Dakshin Gangotri and Maitri) have been measured. The general range of δ18O values is from -14 to -30 (in ‰ w.r.t SMOW). The fresh water lakes in the Schirmacher Range area receive 30 to 40% of their input from melt water of adjoining glacier. This glacier has old ice characterized by extremely depleted δ18O value of -42‰ at the shallow depth of 10 m. This is not normally expected and can complicate interpretation of δ18O profile in cores from this region for palaeoclimatic studies.Keywords
Geochemistry, Oxygen Isotopes, Ice, Snow, Water, Antarctica.- Carbon Isotope Ratio of the Coaly Matter from the Basal Part of the Proterozoic Vindhyan Supergroup
Authors
1 Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, IN
2 Centre of Advanced Study in Geology, University of Saugar, Sagar 470 003, MP, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 27, No 1 (1986), Pagination: 119-120Abstract
The stable carbon isotope ratio (13C/12C) of the carbonaceou matter from the basal part of the Vindhyan sub-group, estimated to be about 1200 Ma old, has been measured and the values support a biogenic origin for the incorporated carbon.- Stable Isotope Systematics in Tree Cellulose as Palaeoenvironmental Indicators - A Review
Authors
1 Physical Research Laboratory, Ahmedabad 380 009, IN
2 National Geophysical Research Institute, Hyderabad 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 27, No 1 (1986), Pagination: 154-167Abstract
Stable isotope ratios of hydrogen, carbon and oxygen in tree cellulose have been recently demonstrated as potential indicators of past climate, However, a number of problems remain to be solved before isotope dendroclimatology can be used for routine reconstruction of palaeoclimate. Here we review the existing Literature, with a special reference to the Indian context and identify key problems that deserve immediate attention.- Study of Groundwater Occurrence and Mixing in Pushkar (Ajmer) Valley, Rajasthan with δ18O and Hydrochemical Data
Authors
1 Nuclear Research Laboratory, IARI, New Delhi-110012, IN
2 Physical Research Laboratory, Navarangpura, Ahmedabad-380009, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 43, No 4 (1994), Pagination: 449-456Abstract
Stable isotopic composition of groundwaters and their hydrochemistry have been used for investigating possible existence of both palaeo-water and replenishable groundwater in Pushkar (Ajmer) Valley, Rajasthan. Causes of salinity increase in some of the groundwaters and intermixing of saline and fresh groundwaters have also been studied. The δ18O values of water samples show a wide range varying from -6.3‰ to +4.0‰, indicating different sources of origin of these waters. There is a depletion of δ18O with increasing depth of water table which may be due to stratification in groundwater with shallower zones being recharged from relatively modern rainfall. The chemical composition of groundwatlbrs shows a wide variation with electrical conductivity ranging from 150μmhos/cm to 8400μmhos/cm. Linear relationship between δ18O and Cl- is a clear indication that the groundwaters are freshwater intermixed with different amounts of a saline endmember. Highly depleted, low salinity groundwaters seem to be of palaeo-origin. The most probable genesis of the 18O enriched, high salinity groundwater is from an originally evaporitic environment.Keywords
Groundwater, Stable Isotope, Hydrogeology, Pushkar, Rajasthan.- Carbon and Oxygen Isotopic Compositions of Infratrappean Limestones from Central and Western India and Their Depositional Environment
Authors
1 Physical Research Laboratory, Ahmedabad 380 009, IN
2 Geological Survey of India, Lucknow 226 020, IN
3 Geological Survey of India, Bhopal 462 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 50, No 3 (1997), Pagination: 289-296Abstract
The lowermost formation of the Bagh Group, the Nimar Sandstone, was deposited in fresh water whereas the upper two formations, the Nodular and Coralline Limestones were deposited in marine environment There is a distinct signature of diagenetic alteration in the oxygen isotopic ratios but the carbon isotopic ratios did not change signi ficantly. The marine transgression from the continental Nimar period to upper Limestone period was extremely rapid in all four sections (Mogra, Rampura, Acharkunda and Bariya) examined. However, the subsequent regression during the onset of the Lameta period was slow and fluctuating. The oxygen isotope ratios of some limestones from the Kawant area (Mogra section, Nodular Limestone Formation) are unusually low probably due to thermal alteration effected by intrusion of the nearby Ambadongar Carbonatite at a later date.Keywords
Carbon, Oxygen Isotopes, Bagh beds, Lameta Formation, Cretaceous, Gujarat and Madhya Pradesh.- Rare Earth Element Geochemistry of Selected Mafic-Ultramafic Units from Singhbhum Craton: Implications to Source Heterogeneity
Authors
1 Department of Applied Geology, Indian School of Mines, Dhanbad, IN
2 Physical Research Laboratory, Ahmedabad, IN
3 Tokyo Metropolitan University, JP
4 Tokyo Metropolitan University, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 50, No 6 (1997), Pagination: 717-726Abstract
Modelling ofREE data indicates that while mafic rocks of Dhanjori Group are partial melting products of a spinel Iherzolite source, Dalma ultrabasics are the residue after the melt-extraction from an original garnet lherzolite rock. Ultramafics of Newer dolerite dykes indicate either derivation by mantle meta somatism or effect of post magmatic serpentinisation. REE data in conjunction with the available geochronological data suggest that significant mantle heterogeneity existed over relatively smaller distances (∼100 km) even during Proterozoic and that the mantle evolved in a non-uniform manner with distinct localised processes.Keywords
REE Geochemistry, Singhbhum Craton, Mantle Heterogeneity.- Isotopic Evidence of a Rapid Cooling and Continuous Sedimentation across the Eocene Oligocene Boundary of Wagapadhar and Waior, Kutch
Authors
1 Department of Applied Geology, Indian School of Mines, Dhanbad-826004, IN
2 Physical Research Laboratory, Navarangpura, Ahmedabad-380009, IN
3 Department of Geology, Presidency College, Calcutta-700073, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 51, No 2 (1998), Pagination: 245-248Abstract
High resolution oxygen isotope analysis of samples from two different Eocene Oligocene Boundary (EOB) sections of Wagapadhar and Waior of Kutch area and their correlation with DSDP sites indicate continuity of sedimentation at these sites. A rapid cooling of -6°C across the EOB, synchronous with extinction of Eocene larger benthic foraminifera, is also observed.Keywords
Isotope, Eocene-Oligocene Boundary, Kutch, Gujarat.- Carbon and Oxygen Isotopic Compositions of Carbonate Concretions of the Talchir formation and their Palaeo-Environmental Implications
Authors
1 Plot 283, 17th East Street, Kamraj Nagar, Tiruvenmiyur, Chennai - 600041, IN
2 Physical Research Laboratory, Ahmedabad - 380 009, IN
3 Indian Institute of Technology, Kharagpur - 721 302, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 61, No 5 (2003), Pagination: 633-633Abstract
No Abstract.- Carbon, Oxygen and Uranium Isotopic Study of Uraniferous Dolostone from Cuddapah Basin, Southern India : Implications to Depositonal Environment and Uranium Alteration
Authors
1 Physical Research Laboratory, Ahmedabad 380 009, IN
2 Atomic Minerals Division, Dept. of Atomic Energy, Hyderabad - 500 016, IN
3 Atomic Minerals Division, Dept. of Atomic Energy, Bangalore 560 072, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 49, No 5 (1997), Pagination: 495-502Abstract
The dolostones show a narrOw range of δ13C values but a large range of δ13O values. The small spread of δ13C from 0.1‰ to -0.9‰ is typical of marine carbonates, whereas the large range of δ13O from -7‰ to -14‰ represents characteristic Proterozoic marine carbonates some of which were exposed to alteration by fresh continental waters. A diagenetic environment of mixed marine and fresh water for the dolostone alteration is also supported by earlier studies in sedimentary structures and petrography. The 234U/238U activity ratio of 0.7 in some of the mineralised samples shows the effect of ongoing chemical leaching of uranium from discrete uranium minerals like pitchblende and coffinite.- Carbon and Oxygen Isotopic Compositions of Carbonate Concretions of the Talchir formation and their Palaeoenvironmental Implications
Authors
1 Physical Research Laboratory, Ahmedabad - 380 009, IN
2 Indian Institute of Technology, Kharagpur - 721 302, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 60, No 6 (2002), Pagination: 677-686Abstract
Ubiquitous presence of carbonate rich nodules in glaciogene sediments of various Permo-Carboniferous basins (Talchir) in peninsular India offers promise for delineating the climatic condition and environment of deposition at that time. Isotopic composition of carbon and oxygen have been determined in carbonate nodules collected from the basal formation (Talchir) of three Gondwana basins of east-central India along with a few samples from contemporaneous Dwyka tillite of South Africa. Petrographic, cathodoluminescence and sedimentary evidences suggest that many of these nodules contain primary carbonate precipitates and therefore their geochemical signatures can be used for palaeoclimatic inference. The mean δ180 and δ13C values of the calcites in the nodules are 10.8% w.r.t. SMOW and - 9.7%0 w.r.t. PDB respectively, suggesting a freshwater environment (probably lacustrine) for formation of these concretions. The mean oxygen isotopic composition of meteoric water at that time (Early Permian) and location (70° S palaeolatitude) estimated from δ18Oof calcite is -22.7%0 and is depleted by a few per mil from the expected isotopic composition of precipitation at this latitude. This depletion can be interpreted either in terms of an amount effect due to enhanced rainfall or an altitude effect if the precipitation occurred at high altitude (as expected for development of the Talchir glacier).Keywords
Carbon and Oxygen isotopes, Carbonate concretions, Talchir formation, Eastern India.- Some Aspects of Cast Iron Welding
Authors
1 Central Mechanical Engineering Research Institute, Durgapur, West Bengal, IN
Source
Indian Welding Journal, Vol 5, No 4 (1973), Pagination: 119-123Abstract
Welding of cast iron has been mainly limited to repairing and salvaging work. Some complicated separately-cast parts have also been joined to the main castings by welding but large scale production of gray iron structures by joining two or more parts has not been feasible.- Concerns of Educational Technology for Technical Education
Authors
1 Electrical Engineering, Technical Teachers Training Institute, Chandigarh 160 019, IN
Source
Journal of Engineering Education Transformations, Vol 8, No 4 (1995), Pagination: 1-7Abstract
The concept of Educational Technology has undergone considerable change over the last three decades from the one largely concerned with transmission-reception problems to the one which is basically a problem solving approach.
This paper shows concerns of educational technology in the context of rapidly changing technological scenario, giving an account of present status of its use in the technical institutions and the future trends. The paper also makes suggestions towards enriching instructional processes for preparing students to face the challenges of the world of work through judicious use of educational technology.
- Improving Academic Climate of Polytechnics
Authors
1 TTTI, Chandigrah 160 019, IN
Source
Journal of Engineering Education Transformations, Vol 6, No 4 (1993), Pagination: 29-33Abstract
Efforts are being made in the development of polytechnic education through World Bank Assisted project where a huge sum of money is being pumped into the system. The thrust areas are Capacity expansion, Quality improvement, and Improvement of efficiency. While faculty are being sent for training, sophisticated equipments are being procured and buildings are being constructed, there seems to be very little change in the method of curriculum implementation. Teaching-learning in polytechnics in specific, and the overall academic climate of the polytechnics in general, seem to remain more or less unchanged thereby raising a very pertinent question as to whether this huge investment would bring the desired change in the system I This paper has suggested a strategy for curriculum implementation where teaching, research, and developmental activities are integrated so as to make polytechnic job more challenging, motivating and satisfying and as a result create a better academic climate within the polytechnics. Although the strategy suggested is aimed towards polytechnics, it should be equally applicable to other institutes of same or higher level.- TQM in Engineering Education through Meaningful Student Evaluation and Faculty Appraisal
Authors
1 Hindustan Institute of Technology, Greater Noida, IN
Source
Journal of Engineering Education Transformations, Vol 21, No 4-1 (2007), Pagination: 37-49Abstract
Engineering Education in India has witnessed tremendous growth during the past decade. This sudden expansion has led to the problem of maintenance of desired quality. External controlling authorities have been making some effort through their "equality inspectors" having only marginal result. Internal motivation only can lead to achievement and maintenance of quality. While TQM techniques call be tried in education by taking a holistic view of the system, the critical components of the system, viz faculty development and the student evaluation system need to be given priority. Factors which would influence internal motivation have also to be looked into.- Interactive Teaching-Learning Systems for Teachnical Education
Authors
1 Electrical Engineering Department, T.T.T.I., Chandigarh-160019, IN
2 School of Enginering, Indira Gandhi National Open University, New Delhi, IN
Source
Journal of Engineering Education Transformations, Vol 5, No 3 (1992), Pagination: 6-14Abstract
This paper suggests four alternative teaching-learning models which are interactive in character. In view of the requirement of preparing students to face the fast changing technological scenario in the world of work, these teaching-learning models assume importance. In this paper, the need for introduction of interactive teaching-learning and description of four interactive teaching-learning models have been presented. The models suggested in this paper have been field tested through independent experiments for their validity.- Industry-Institute Interaction Experiences at TTTI, Chandigarh
Authors
1 TTTI, Chandigarh, IN
Source
Journal of Engineering Education Transformations, Vol 9, No 3 (1996), Pagination: 59-63Abstract
Industry Institute Interaction has extensively been discussed on many platforms in the recent past. Many useful recommendations and suggestions have come up during the deliberations. Certain institutions have achieved success in this regard whereas many institutions are yet to reap the benefits of Industry-Institute Interaction. This paper highlights the experiences the Technical Teachers Training Institute (TTTl) Chandigarh in designing curricula for new programmes, revising and improving the existing programmes, in organizing training programmes in industry, in preparation of instructional materials, and in training of teachers, with active involvement of industry. Interactions with industry in these activities have been found to be mutually beneficial.- An Integrated Approach to Faculty Training and Development-A Case Study
Authors
1 TTTI, Chandigarh & Former Director, NITTTR, Kolkata, IN
Source
Journal of Engineering Education Transformations, Vol 19, No 3-4 (2006), Pagination: 85-89Abstract
Shortage of good faculty in most of the technical institutions has become a major factor affecting the quality of education and training offered by these institutions. Efforts are being made by AICTE to create training facilities f or the teachers at different locations. However, there has been low internal motivation in the management of most of the institutions towards faculty training. The training programmes conducted by various training institutions have also their limitations in respect of their duration, lack of follow up of training at institution level, no objective evaluation of outcome of training. etc.
This paper highlights the initiatives taken by the Management of a Progressive Technical and other Professional Education group towards Faculty Training and Development by allocating a certain percentage of their revenue, with a view to provide quality assurance to the stake holders as also create examples for others to follow.
- TTTI Chandigarh
Authors
1 TTTI, Chandigarh, IN
Source
Journal of Engineering Education Transformations, Vol 12, No 1 (1998), Pagination: 20-30Abstract
HISTORICAL PERSPECTIVE:Technical Teachers' Training Institute, Chandigarh is one of the four regional institutes established by the Ministry of Human Resources Development (MHRD), Government of India, in 1967. Large scale industrialisation during the two decades since independence created the need for competent engineers and technicians in a variety of areas of production, manufacturing, construction and services.- An Experimental Study on the Effectiveness of Educational Television Programmes
Authors
1 Technical Teachers Training Institute Sector 26, Chandigarh, IN
Source
Journal of Engineering Education Transformations, Vol 10, No 1 (1996), Pagination: 29-33Abstract
The paper presents findings of an experimental study on the effectiveness of ETV programmes as against conventional teaching of certain engineering subjects. The results showed no significant difference in either achievement of students in learning or in their attitude towards the two methods of teaching - learning used. On the basis of experimental study, suggestions have been made for effective ETV course material development and their use.- Changing Strategies of Professional Education
Authors
1 NITITR, Chandigarh, IN
Source
Journal of Engineering Education Transformations, Vol 19, No 1 (2005), Pagination: 26-30Abstract
The ultimate purpose of education is learning by students and not teaching by the teachers. However, most often we teachers take full responsibilities of teaching by way of "Covering the Syllabus" within the stipulated time.- Planning and Organizing Practical Work
Authors
1 National Institute of Technical Teacher Training and Research (NITTTR), Kolkata, IN
Source
Journal of Engineering Education Transformations, Vol 19, No 2 (2005), Pagination: 41-46Abstract
Practical Work is one of the vital components of any Engineering Curriculum. Its importance has, over the years, been realised by both the curriculum designer and the teachers. There has been an argument in favour of increasing the time allotted for practical work. The ratio of time allocated for theory and practical work has been debated as 40:60, 50:50, 60:40, etc.- Review of Book on Quality Assurance in Technical Education
Authors
1 TTTI, Chandigarh, IN