Browsing by Author "S.N. Tripathi"

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Assessment of hypocholesterolemic and hypolipidemic action of C. mukul in human beings suffering from lipid disorders
(1978) M. Gupta; S.N. Tripathi; B.N. Upadhyaya
[No abstract available]
Beneficial effect of Inula racemosa (pushkarmoola) in angina pectoris: A preliminary report
(1984) S.N. Tripathi; B.N. Upadhyaya; V.K. Gupta
[No abstract available]
Effect of a keto steroid of Commifora mukul L. on hypercholesterolemia and hyperlipidemia induced by neomercazole and cholesterol mixture in chicks
(1975) S.N. Tripathi; M. Gupta; S.P. Sen; K.N. Udupa
[No abstract available]
Effect of histamine & Albizzia lebbek Benth. on guinea pig adrenal glands
(1979) S.N. Tripathi; P. Shukla
[No abstract available]
Effect of hydration and dehydration on initiation and dynamics of some physiological reactions in desiccation tolerant cyanobacterium Scytonema geitleri
(1998) B.S. Tiwari; S.N. Tripathi
The effect of hydration and dehydration has been studied on extent and recovery of some metabolic reactions in desiccation tolerant terrestrial cyanobacterium Scytonema geitleri. The results show that the energy transducing reactions like photochemical reactions of photosynthesis recover first, followed by increase in ATP pool size. During later phase of hydration, appearance of energy consuming processes such as CO2 fixation and nitrogen fixation have been observed. Sensitivity of reactions during dehydration followed the pattern reverse to recovery processes.
Effect of temperature on chlorophyll stability of some subaerial blue‐green algae
(1983) S.N. Tripathi
Chlorophyll stability index of eight subaerial blue‐green algal species, collected from their natural habitats, i.e., bark of trees, soil and roof‐tops and from cultures, has been determined. The algae from natural habitats showed greater chlorophyll stability compared to those algae from cultures. Among the natural algae, high chlorophyll stability was observed in the algae inhabiting adverse habitats. A slight modification in the method of MURTY and MAJUMDER (1962) for determination of chlorophyll stability index has been made. Here the total percentage loss in the amount of Chl a of heated sample in relation to its unheated sample has been considered as chlorophyll stability index. Copyright © 1983 Wiley‐VCH
Effect of voluntary retention of urine on plasma and urinary biogenic amines as well as circulatory and respiratory responses
(1982) M. Shukla; S.N. Tripathi; P.K. Dey
[No abstract available]
Effects of chemicals on some members of Indian charophyta I
(1976) Y.S.R.K. Sarma; S.N. Tripathi
The effects of four different chemicals (colchicine, MH, caffeine and theobromine) on four taxa belonging to Chara and Nitella have been studied cytologically. Out of four different chemicals, MH did not produce any immediate cytological effects, which however, appeared subsequently when the materials were transferred to chemical free medium subsequent to treatments. All the chemicals brought about mitotic inhibition in all the algae investigated, to some extent or the other, levels of inhibition depending upon the concentrations of the chemicals or durations of treatment in the same concentrations. Of the four chemicals, theobromine proved to be most potent mitotic inhibitor. Colchicine has induced polyploidy, even upto the level of tetraploidy in C. globularis and C. braunii. Cytokinetic inhibition was brought about rarely by colchicine in C. globularis and more frequently by caffeine and theobromine treatments resulting in binucleate cells. Pycnotic nuclei were observed in all the treatments of the chemicals but at higher concentrations. Clumping of chromosomes at metaphase was produced by all the chemicals to varying degrees. Incomplete c-mitotic effect was observed only in N. flagellijormis with caffeine treatment. All the four chemicals proved to be cytotoxic to the algae under investigation, depending upon the concentration and duration of treatment. Theobromine even at 0.05% to 0.01% concentrations appeared to be cytotoxic. Algal materials appeared to be more resistant to the chemicals under study, as compared with higher plants. © 1990, Taylor and Francis Group, LLC.
Effects of chemicals on some members of Indian charophyta II
(1976) Y.S.R.K. Sarma; S.N. Tripathi
The effects of GA, 2, 4-D, coumarin and acenaphthene have been studied on selected taxa belonging to Chara and Nitella. Various chemicals used have proved to be mitotic inhibitors, the degree of inhibition being related to their concentrations and/or duration of treatment. GA, however, induced mitotic stimulation in all taxa at very low concentrations (1 to 10 ppm). Acenaphthene induced polyploidy in C. globularis. Vacuolated nuclei were noticed only in coumarin treatmens in C. braunii. Pycnotic nuclei, were recorded in the cases of GA and acenaphthene treatments. Chromosome breakage was observed in GA, 2, 4-D and acenaphthene treatments. However, acenaphthene induced chromosome fragmentation only in N. ffagelliformis. Other chromosomal changes such as clumping at metaphase, bridges, erosion and laggard formation were noticed in all the chemical treatments. Cytomixis was noticed in acenaphthene treatments in C. globularis. Excepting 2, 4-D and acenaphthene, other chemicals proved to be cytotoxic at the highest concentrations used. © 1990, Taylor and Francis Group, LLC.
Effects of gibberellic acid on the green alga, Oedogonium acmandrium Elfving
(1974) Y.S.R.K. Sarma; S.N. Tripathi
[No abstract available]
Experimental studies on the hypocholesterolemic effect of Commiphora Mukul. Engl. (GUGGUL)
(2013) G.V. Satyavati; C. Dwarakanath; S.N. Tripathi
Commiphora mukul Engl. (Balsamodendron mukul, Hooks-family: Burseraceae is a versatile indigenous drug claimed by the Ayurvedic System of medicine to be highly efficacious in the treatment of varied clinical disorders like rheumatism, arthritis neurological diseases, serofulous affections, haemorrhoids, urinary disorders and a few skin diseases (Nadakarni, 1954; Chopra et at., 1958). In recent times, the anti-inflammatory and anti-arthritic activity of the drug has been investigated in great detail (Gujral et al., 1960; Bhargava, 1962; Mahesh Rai et al., 1967; Satyavati et al., 1968). However, little scientific study has been conducted on another important aspect of its therapeutic indications, namely, the utility of Commiphora mukul in disorders of lipid metabolism. Ancient Ayurvedic authorities, particularly Sushruta, have emphasized the value of guggul in the treatment of obesity and its many vascular and neurological complications arising as a result of an inherent disorder in lipid metabolism (Sushruta Sahmita; Charaka Samhita; Ashtangahridaya; Bhavaprakash). The present work deals with experimental investigations on the effect of the oleoresin of Commiphora mukul on the serum and tissue lipids, particularly the serum cholesterol, lipid-phosphorus, and cholesterol/phospholipid ratio which have been claimed to play a significant role in the pathogenesis of atherosclerosis, which according to Boyd (1961), is the greatest killer of mankind today.
Extraction and purification of an unusual phycoerythrin in a terrestrial desiccation tolerant cyanobacterium Lyngbya arboricola
(2007) S.N. Tripathi; Shivali Kapoor; Alpana Shrivastava
Presence and stability of an unusual phycoerythrin (PE) characteristically similar to R-PE are described in a terrestrial, desiccation-tolerant cyanobacterium, Lyngbya arboricola. Extraction and purification of the PE by using acetone precipitation, gel filtration and ion-exchange chromatography resulted in achieving a purity index (A560/A280) of up to 5.2. SDS-PAGE of the PE showed presence of 18 kDa, 20 kDa and 32 kDa bands corresponding to α, β and γ subunits of R-PE without any other contaminating phycobiliproteins (PBPs). The absorption spectrum of the PE was distinguished by two major peaks at 499 and 559 nm. The maximum fluorescence emission at room temperature was 578 nm. Spectroscopic and electrophoresis characteristics of PE in the dry mats on storage at 25±1°C over silica gel for 2 years remained almost unaffected. Quantitatively, storage stability of the PE was in the order of dry mats > lyophilized > liquid state and the impact of temperature on loss of PE was in the order of 25°C>-20°C>4°C. The relevance of L. arboricola for production of stable unusual PE is discussed. © 2007 Springer Science+Business Media, Inc.
Growth of cyanobacteria (blue-green algae) on urban buildings
(1990) S.N. Tripathi; B.S. Tiwari; E.R.S. Talpasayi
Black and brown patches, indicating the growth of certain cyanobacteria, are very common on building surfaces in the tropics. The patches are mainly comprised of colonial species of cyanobacteria such as Gloecapsa, Gloeothece, Aphanocapsa, and Choococcus, and filamentous species like Scytonema and Tolypothrix. The colonial forms were primary colonizers. Water relation studies revealed that colonial and filamentous crusts which absorbed nearly 165% and 191% water at 0 bar osmotic water potential, lost up to 60, 70 and 80% of the absorbed water on exposure to the atmosphere of -28, -46 and -210 bar in time periods of about 10, 9 and 7 hours, respectively, at 32 °C. The colonial and filamentous crusts, growing as well as dried over conc. H2SO4, were separately subjected to various water potentials-matric, osmotic and osmotic-oversaturated - at 0 bar and temperatures to study their viability and growth in terms of 14CO2 fixation. It was found that 0 bar osmotic water potential and 30 °C temperature were optimum for 14CO2 fixation. When the dried algae exposed to higher temperatures (55-110 °C) were grown, they did not show much variation in 14CO2 fixation compared to the unexposed algae. © 1991.
Irritable bowel syndrome: Therapeutic evaluation of indigenous drugs
(1989) S.K. Yadav; A.K. Jain; S.N. Tripathi; J.P. Gupta
[No abstract available]
Pre-monsoon aerosol characteristics over the Indo-Gangetic Basin: Implications to climatic impact
(Copernicus GmbH, 2011) A.K. Srivastava; S. Tiwari; P.C.S. Devara; D.S. Bisht; Manoj K. Srivastava; S.N. Tripathi; P. Goloub; B.N. Holben
Sun/sky radiometer observations over the Indo-Gangetic Basin (IGB) region during pre-monsoon (from April-June 2009) have been processed to analyze various aerosol characteristics in the central and eastern IGB region, represented by Kanpur and Gandhi College, respectively, and their impacts on climate in terms of radiative forcing. Monthly mean aerosol optical depth (AOD at 500 nm) and corresponding Angstrom Exponent (AE at 440-870 nm, given within the brackets) was observed to be about 0.50 (0.49) and 0.51 (0.65) in April, 0.65 (0.74) and 0.67 (0.91) in May and 0.69 (0.45) and 0.77 (0.71) in June at Kanpur and Gandhi College, respectively. Results show a positive gradient in AOD and AE from central to eastern IGB region with the advancement of the pre-monsoon, which may be caused due to diverse geographical location of the stations having different meteorological conditions and emission sources. Relatively lower SSA was observed at the eastern IGB (0.89) than the central IGB (0.92) region during the period, which suggests relative dominance of absorbing aerosols at the eastern IGB as compared to central IGB region. The absorbing aerosol optical properties over the station suggest that the atmospheric absorption over central IGB region is mainly due to dominance of coarse-mode dust particles; however, absorption over eastern IGB region is mainly due to dominance of fine-particle pollution. The derived properties from sun/sky radiometer during pre-monsoon period are used in a radiative-transfer model to estimate aerosol radiative forcing at the top-of-the atmosphere (TOA) and at the surface over the IGB region. Relatively large TOA and surface cooling was observed at the eastern IGB as compared to the central IGB region. This translates into large heating of the atmosphere ranging from 0.45 to 0.55 K day-1 at Kanpur and from 0.45 to 0.59 K day-1 at Gandhi College. © Author(s) 2011.
Seedling growth of five tropical dry forest tree species in relation to light and nitrogen gradients
(Oxford University Press, 2014) S.N. Tripathi; A.S. Raghubanshi
Aims Increasing anthropogenic nitrogen (N) deposition has been claimed to induce changes in species composition and community dynamics. A greenhouse experiment was conducted to examine the effect of increased N availability on growth and functional attributes of seedlings of five tree species with different life history characteristics under varying irradiances. The following questions have been addressed: (i) how do the pioneer and non-pioneer species respond in absolute growth and relative growth rate (RGR) to the interaction of light and nitrogen? (ii) how does the interaction between irradiance and nitrogen availability modulate growth attributes (i.e. functional attributes)? (iii) is there any variation in growth responses between leguminous and non-leguminous species along the light and nitrogen gradients? Methods: Seedlings of five tree species (Acacia catechu, Bridelia retusa, Dalbergia sissoo, Lagerstroemia parviflora and Terminalia arjuna) were subjected to twelve combinations of irradiance and N levels. Various growth traits, including height (HT), basal area (BA), whole plant dry biomass (MD), leaf mass per unit area (LMA), leaf area ratio (LAR), net assimilation rate (NAR), RGR, biomass fractions, root-to-shoot ratio (R:S) and leaf nitrogen content, were studied to analyse intra- and inter-specific responses to interacting light and N gradients. Important Findings: Significant interactions for irradiance and N availability for majority of growth attributes indicates that growth and biomass allocation of seedlings were more responsive to N availability under high irradiance. However, species responded differentially to N addition and they did not follow successional status. Slow growers (B. retusa, a shade-tolerant species and L. parviflora, a light demander) exhibited greater response to N enrichment than the fast growers (A. catechu, D. sissoo and T. arjuna). However, N-mediated increment in growth traits was greater in non-legumes (B. retusa, L. parviflora and T. arjuna) compared with that of legumes (A. catechu and D. sissoo). Allocation of biomass to root was strongly suppressed at the highest N supply across species; however, at high irradiance and high N availability, a greater suppression in R:S ratio was observed for B. retusa. NAR was a stronger determinant of RGR relative to LAR, suggesting its prominent role in increased RGR along increasing irradiances. Overall, a higher growth response of slow-growing species to elevated N levels, particularly the non-pioneers (B. retusa and L. parviflora) suggests that future N deposition may lead to perturbations in competition hierarchies and species composition, ultimately affecting community dynamics in nutrient-poor tropical dry forests. © The Author 2013.
SULPHYDRYLS AND SURVIVAL OF SUBAERIAL BLUE-GREEN ALGAE
(Indian Academy of Sciences, 1980) S.N. Tripathi; E.R.S. Talpasayi
[No abstract available]
Thyroid stimulating action of Z-guggulsterone obtained from Commiphora mukul
(1984) Y.B. Tripathi; O.P. Malhotra; S.N. Tripathi
[No abstract available]
Thyroid stimulatory action of (Z)-guggulsterone: Mechanism of action
(1988) Y.B. Tripathi; P. Tripathi; O.P. Malhotra; S.N. Tripathi
[No abstract available]
Variability in aerosol optical properties over an urban site, Kanpur, in the Indo-Gangetic Plain: A case study of haze and dust events
(Elsevier Ltd, 2016) Kirpa Ram; Sunita Singh; M.M. Sarin; A.K. Srivastava; S.N. Tripathi
In this study, we report on three important optical parameters, viz. absorption and scattering coefficients (babs, bscat) and single scattering abledo (SSA) based on one-year chemical-composition data collected from an urban site (Kanpur) in the Indo-Gangetic-Plain (IGP) of northern India. In addition, absorption Ängstrom exponent (AAE) was also estimated in order to understand the wavelength dependence of absorption and to decipher emission sources of carbonaceous aerosols, in particular of black carbon. The absorption and scattering coefficients ranged between 8.3 to 95.2 Mm-1 (Mm-1 = 10-6 m-1) and 58 to 564 Mm-1, respectively during the study period (for n = 66; from January 2007 to March 2008) and exhibit large seasonal variability with higher values occurring in winter and lower in the summer. Single scattering albedo varied from 0.65 to 0.92 whereas AAE ranged from 0.79 to 1.40 during pre-monsoon and winter seasons, respectively. The strong seasonal variability in aerosol optical properties is attributed to varying contribution from different emission sources of carbonaceous aerosols in the IGP. A case study of haze and dust events further provide information on extreme variability in aerosol optical parameters, particularly SSA, a crucial parameter in atmospheric radiative forcing estimates. © 2016 Elsevier B.V.