Papers by Ramachandra Mohan
Ecology, Environment and Conservation, Jan 31, 2022
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Physico-chemical characteristics of water samples from Byramangala lake, were analyzed for a peri... more Physico-chemical characteristics of water samples from Byramangala lake, were analyzed for a period of one year from Jan. 2003 to Dec. 2003. Spatial and temporal variations were evident in all parameters investigated comparatively higher values of BOD, COD and low D.O. levels were observed during premonsoon (Summer) suggesting strong indication of contamination by organic matter and sewage effluents. Coyright Enviromedia.
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Theriogenology, 1999
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Water quality is a term used here to express the suitability of water to sustain various Uses or ... more Water quality is a term used here to express the suitability of water to sustain various Uses or processes. The physical and Chemical characteristics of water at Yelahanka lake in Bangalore during the year May 2007-May 2008 have been studied on the concentrations of Toxic substances for drinking water use, or restrictions on temperature and pH ranges for Water supporting invertebrate communities. The pH value of Yelahanka Lake recorded 7.0-8.2; the pH was found above 7.0 in all the lakes making them alkaline. The alkalinity value of Yelahanka Lake ranges from 8.2 NTU – 10.7 NTU. Conductivity is good and rapid measure of the solids recorded ranges from 838µmhos/cm - 1213 µmhos/cm, the values observed in Yelahanka lake values are very much higher than the prescribed standards limits (1400 µmhos/cm) recommended by W.H.O. Conductivity increases with increasing amount and mobility of ions and also can be used an indicator of water pollution.Dissolve oxygen values ranges from 4.0 mg/l – 7...
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Wetlands perform numerous valuable functions such as recycle nutrients, purify water, attenuate f... more Wetlands perform numerous valuable functions such as recycle nutrients, purify water, attenuate floods, maintain stream flow, recharge ground water, and also serve in providing drinking water source, fish, fodder, fuel, recreation to the society. The interaction of man with wetlands during the last few decades has been a concern largely due to land loss – accompanied by intensified industrial, commercial, and residential development further leading to pollution of wetlands by domestic, industrial sewage, and agricultural runoffs- as fertilizers, insecticides. The fact that wetland values are overlooked has resulted in threat to the source of these benefits South Indian wetlands are being lost on account of various anthropogenic activities .
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Biotechnic & Histochemistry, 2016
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Atmospheric Measurement Techniques, 2016
Direct detection of highly reactive, atmospheric hydroxyl radicals (OH) is widely accomplished by... more Direct detection of highly reactive, atmospheric hydroxyl radicals (OH) is widely accomplished by laser-induced fluorescence (LIF) instruments. The technique is also suitable for the indirect measurement of HO<sub>2</sub> and RO<sub>2</sub> peroxy radicals by chemical conversion to OH. It requires sampling of ambient air into a low-pressure cell, where OH fluorescence is detected after excitation by 308 nm laser radiation. Although the residence time of air inside the fluorescence cell is typically only on the order of milliseconds, there is potential that additional OH is internally produced, which would artificially increase the measured OH concentration. Here, we present experimental studies investigating potential interferences in the detection of OH and peroxy radicals for the LIF instruments of Forschungszentrum Jülich for nighttime conditions. For laboratory experiments, the inlet of the instrument was over flowed by excess synthetic air containing one...
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Microorganisms are cosmopolitan, diverse and distributed in openwater and sediments. In the prese... more Microorganisms are cosmopolitan, diverse and distributed in openwater and sediments. In the present investigation, distribution of bacteria including pathogens in water and sediments of Anjanapura lake was studied. The study has found Total heterotrophic bacterial strains belonging to 13 genera
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Global journal for research analysis, 2018
Present paper deals with the study of Physico-chemical parameters of Thally Lake, (Krishnagiri di... more Present paper deals with the study of Physico-chemical parameters of Thally Lake, (Krishnagiri district, Tamil Nadu). Monthly variations in the physical and chemical parameters such as temperature, pH (6.7 to 8.9), Dissolved Oxygen (5.2-7.5 mg/L), Total Hardness (68 to 190mg/L), Chlorides (11 to 1030mg/L), Phosphate (0.30 to 2.86mg/L) Nitrate (0.88 to 10.40mg/L) etc ,were investigated. All the parameters were beyond the permissible limits.
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Aquatic ecosystem is one of the most productive ecosystems providing many crit. services to human... more Aquatic ecosystem is one of the most productive ecosystems providing many crit. services to humans, such as the following: plants carry out photosynthesis and produce the oxygen; bacteria process the org. waste products and maintain good water quality. The objective of this endeavor was to investigate the ecol. status of the Thalli lake, the physicochem. anal. of water shows with low values of pH, cond., TDS, nitrate, phosphates, BOD, COD and so on. The nature of the lake is non-polluted. [on SciFinder(R)]
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Physico-chemical parameters of water are a prime consideration to assess the water quality of a l... more Physico-chemical parameters of water are a prime consideration to assess the water quality of a lake for its best utilization for drinking, irrigation and fisheries. In the present investigation, the study of monthly variation of different physico-chemical characteristics and phytoplankton diversity were carried out from January to December 2011 to know the water quality of Nalligudda Lake of Bangalore. Physico-chemical parameters of the water samples such as water temperature (24.2-32.3.C), pH (7.1-8.5), total dissolved solids (300-800 mg/L), electrical conductivity (468.75-1250 µmhos/cm), dissolved oxygen (3.9-7.15), biological oxygen demand (2.4-7.2), chemical oxygen demand (9.9-41.4), phosphate (0.32-3.1 mg/L) and nitrate (2.86-6.4 mg/L) were recorded in the present investigation. Totally 51 species of phytoplankton belonging to different taxonomic groups were identified. Among these, 22 species belonged to Chlorophyceae, 8 species to Euglenophyceae, 2 species to Chrysophyceae, ...
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Current Biotica, 2013
Department of Zoology, Bangalore University, Bangalore-560 056, Karnataka, India * E-mail:lathana... more Department of Zoology, Bangalore University, Bangalore-560 056, Karnataka, India * E-mail:lathanarayan201@gmail.com Air borne fungi are the most common organisms in nature. They were correlated with the air pollution and were proposed as a cause of adverse health effects on humans, animals and plants (Bush and Portnoy, 2001). The main source of viable airborne mycoflora is the soil, water and vegetation, and they vary with time and season. The fungal spores are transported to the atmosphere and are always associated with fine dusty particulate matter. The air we breathe contains an array of bio-pollutants comprising of viruses, bacteria and algae, spores of cryptogams, pollen grains, microscopic fragments of plants and animals, small insects, protozoans, volatile materials including scents and terpenes (Jain and Mishra, 1998). Out of these, the fungal aeromycoflora has an important role in causing human allergy (Sanches, et al., 1999) and Plant pathology (Mughal, 2002). Over the las...
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Testicular cholesterol contents were studied in Glossogobius giuris during non-breeding and bree... more Testicular cholesterol contents were studied in Glossogobius giuris during non-breeding and breeding periods, after exposing the fish for 14 days to salinity, thiourea and methallibure. An increased cholesterol content was obsd. during resting phase. When fish were exposed to 10, 20 and 30% salinity, cholesterol content decreased during non-breeding phase. It also declined drastically during spawning phase. The cholesterol content increased when fish were exposed to various percentages of thiourea during the resting phase with a further increase during the spawning phase. In methallibure-treated fish, the testicular cholesterol content was also increased when compared to controls.
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The fish G. giuris were exposed to various concentrations of neem oil (0.05 ppm, 0.25 ppm, 0.50 p... more The fish G. giuris were exposed to various concentrations of neem oil (0.05 ppm, 0.25 ppm, 0.50 ppm) for 24, 48, 72 and 96 hrs. The results revealed that the lower dosage of neem oil for 24 hrs, treatment for 0.05 ppm showed yolk vesicles increases and few stage I and II of oocytes got degenerated and brings about a reduction in the ovarian weight. A higher dosage of neem oil for 78 hrs and 96 hrs, in for 0.50 ppm the nucleus of stage of I and II oocytes were more and also more atretic follicles, liquification, swelling of follicular wall, ruptured follicles and necrosis. Neem oil appears to inhibit
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The isolates were being identified to genus or species level. The population density of fishes us... more The isolates were being identified to genus or species level. The population density of fishes usually varies quantitatively and qualitatively in different organs such as intestine, skin and gill. Microflora of fish intestine appears to vary with the complexity of the fish digestive system. The genera present in the intestine generally seem to be those from the environment or diet which can survive and multiply in the intestinal tract. Multiple drug resistance was noticed in 88% of the isolated. bacteria. No of Pages: 9
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A survey of the occurrence of fecal indicator bacteria (total coliform TC, fecal coliform FC) in ... more A survey of the occurrence of fecal indicator bacteria (total coliform TC, fecal coliform FC) in Kengeri lake was carried out during the period of 3 years (Jan 2005 to Dec 2007) using membrane filter (MF) technique. The study was implemented to assess the hygiene of water quality in order to give an indication about the actual magnitude of fecal pollution post the discharge of domestic sewage discharge. The total coliform was high in April, may and low in September while fecal coliform was high in June, July and September and low in April. On the basis of the result water was considered to be unsatisfactory for domestic and agricultural purposes throughout the study period. In general total coliform count in the Kengeri lake, greatly increased in summer months and decreased in winter and monsoon months while fecal coliform revealed high values in monsoon which declined in summer months.
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An experiment was designed to examine microbiology of water samples of Ramasandra Lake and furthe... more An experiment was designed to examine microbiology of water samples of Ramasandra Lake and further assess the occurance of the multiple antibiotic resistance of E coli. Analysis of the water samples obtained from the lake indicates high microbial and fecal contamination with microbial load in order of 105 and MPN >1800/100ml. Collected water samples from four stations were screened for the E coli to assess their resistance to 10 different antibiotics. Of the 14 E coli isolates 0% were susceptible to all antibiotics used. The isolates were found resistance to penicillin and tetracycline (100%). Among the 10 antibiotics tested, four pattern of antibiotics resistance were obtained and all of them were multiple antibiotic resistance with the number of antibiotics ranging from 2 to 7. The result indicates the developing antibiotic resistant E coli may be a serious threat on public health, aquatic organisms and environment.
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The lakes of the silicon city of Karnataka are man-built generally for hydrological reasons. The ... more The lakes of the silicon city of Karnataka are man-built generally for hydrological reasons. The ecological roles played by lakes are very vital, in providing drinking water, irrigating agricultural fields, fishing, washing, brick making, and supporting a variety of birds, growth of many types of vegetation, and other habitats. The impact of water bodies on the city climate is also significant: manmade landscape was beautiful once upon a time, but now these lakes are polluted by domestic waste combined with sewage and causes organic pollution because of higher concentration of nitrates and phosphates, which encourages the growth of obnoxious weeds, such as water hyacinths. These floating weeds prevent the penetration of sunlight, which is essential for all life forms, and adversely affect aquatic life and upset the delicate equilibrium of the wetland ecosystem, and these industrial effluents to lakes pollute and contaminate water, which in turn percolate to aquifers and affect groun...
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Journal of Ecology & Natural Resources
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Papers by Ramachandra Mohan