Physico-chemical and biological aspects of Lake Albano

Physico-chemical and biological aspects of a serially connected lab-scale constructed wetland-stabilization tank-GAC slow sand filtration system during removal of selected PPCPs

Chemical Engineering Journal ◽

10.1016/j.cej.2019.03.105 ◽

2019 ◽

Vol 369 ◽

pp. 1109-1118 ◽

Cited By ~ 9

Author(s):

Jianan Li ◽

Xingguo Han ◽

Bernd W. Brandt ◽

Qizhi Zhou ◽

Lena Ciric ◽

...

Keyword(s):

Constructed Wetland ◽

Sand Filtration ◽

Slow Sand Filtration ◽

Filtration System ◽

Physico Chemical ◽

Biological Aspects

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Physico-chemical and Biological Aspects of Monsoon Waters of AShulia for Economic and Aesthetic Applications: Preliminary Studies

Bangladesh Journal of Scientific and Industrial Research ◽

10.3329/bjsir.v42i4.747 ◽

1970 ◽

Vol 42 (4) ◽

pp. 377-396 ◽

Cited By ~ 6

Author(s):

Md. Ariful Islam Khan ◽

AMM Maruf Hossain ◽

ME Huda ◽

M Shahidul Islam ◽

Syed Fazle Elahi

Keyword(s):

Water Resource Management ◽

Physical Parameters ◽

Biological Parameters ◽

Chemical Parameters ◽

The North ◽

Physical Chemical ◽

Physico Chemical ◽

North Eastern ◽

Biological Aspects ◽

North Eastern Part

In the north-eastern part of Dhaka the 'Turag River' extends over Ashulia thana with a few branches. The north-eastern part of Ashulia thana mainly constitute low lands with a physiography of Madhupur Tract interlaced with Brahmaputra Floodplain. Monsoon extends over these lands from May to October and from July to October these lands remain flooded with a water depth of more than 180 cm to less than 275 cm due to surface runoff of rain water and overflow of the river canals. The area under water during this four month period can be used for economic applications such as various types of fishery as well as enhancing the present recreational applications. For these purposes the physical, chemical, and biological aspects of the water are studied to evaluate its suitability for the applications. The study was held over the period of July through December, 2006, samples being taken once every month. The physical parameters covered transparency, odor, temperature, salinity, EC, TSS, and TDS. The chemical parameters of water studied were pH, DO, BOD5, COD, hardness, NO2---N, NO3---N, PO43---P, SO42---S, Cl-, Na, K, Ca, Fe, Ni, Cu, Zn, Cd, Pb, and Hg. Among the biological parameters 'phytoplankton' and 'zooplankton' were qualitatively identified in microscopic observation up to genera. From July to October the water was transparent and of good odor, temperature ranged from 28.2°C to 24.6°C, salinity within 0.58 to 0.83 mg/L, EC within 250 to 608 ? mho/cm, TSS 0.42 to 0.82 mg/L, and TDS within 2.8 to 5.2 mg/L. Among the chemical parameters, pH ranged from 6.6 to 7.4, DO within 6.4 to 6.9 mg/L, BOD5 within 1.5 to 3.28 mg/L, COD within 3.04 to 12.89 mg/L, hardness 26.08 to 37.5 mg/L, NO2--N from undetectable to maximum 0.562 mg/L, NO3--N within 0.539 to 2.158 mg/L, PO43--P 2.35 to 2.75 mg/L, SO42--S 0.23 to 0.29 mg/L, Cl- 1.65 to 6.16 mg/L, Na 3.6 to 12.5 mg/L, K 9.7 to 11.5 mg/L, Ca 6.52 to 14.82 mg/L, Fe 0.1269 to 0.5062 mg/L, Ni 0.028 to 0.050 ?g/L, Cu 0.028 to 0.043 mg/L, Zn 0.023 to 0.048 ?g/L, Cd 0.0023 to 0.0043 ?g/L, Pb 0.043 to 0.093 ?g/L, and Hg was not detected at ppb level. Among the biological parameters a number of phytoplankton were identified covering the classes of Bacillariophyceae, Chlorophyceae, Euglenophyceae, and Cyanophyceae. The zooplanktons included the orders Cladocera and Copepoda within the class Crustacea of phylum Arthropoda. Key words: Freshwater ecology, Water resource management Bangladesh J. Sci. Ind. Res. 42(4), 377-396, 2007

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Study of the Seasonal Variations in the Physico Chemical and Biological Aspects of Indus River Pakistan

Pakistan Journal of Biological Sciences ◽

10.3923/pjbs.2003.1795.1801 ◽

2003 ◽

Vol 6 (21) ◽

pp. 1795-1801 ◽

Cited By ~ 4

Author(s):

Kamran Tassaduqe ◽

Muhammad Ali ◽

Abdus Salam ◽

Muhammad Latif ◽

Tasveer Zahra

Keyword(s):

Seasonal Variations ◽

Indus River ◽

Physico Chemical ◽

Biological Aspects

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Decoration of specific sites on freeze-fractured membranes

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100081565 ◽

1978 ◽

Vol 36 (2) ◽

pp. 140-141

Author(s):

H. Gross ◽

H. Moor

Keyword(s):

Pure Water ◽

Freeze Fracture ◽

Chemical Properties ◽

Surface Forces ◽

Sulfate Pentahydrate ◽

Copper Sulfate Pentahydrate ◽

Physico Chemical ◽

Water Of Hydration ◽

Small Container ◽

Binding Forces

Fracturing under ultrahigh vacuum (UHV, p ≤ 10-9 Torr) produces membrane fracture faces devoid of contamination. Such clean surfaces are a prerequisite foe studies of interactions between condensing molecules is possible and surface forces are unequally distributed, the condensate will accumulate at places with high binding forces; crystallites will arise which may be useful a probes for surface sites with specific physico-chemical properties. Specific “decoration” with crystallites can be achieved nby exposing membrane fracture faces to water vopour. A device was developed which enables the production of pure water vapour and the controlled variation of its partial pressure in an UHV freeze-fracture apparatus (Fig.1a). Under vaccum (≤ 10-3 Torr), small container filled with copper-sulfate-pentahydrate is heated with a heating coil, with the temperature controlled by means of a thermocouple. The water of hydration thereby released enters a storage vessel.

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Activation of cytochrome c to a peroxidase compound I-type intermediate by H2O2: relevance to redox signalling in apoptosis

Biochemical Society Symposium ◽

10.1042/bss0710097 ◽

2004 ◽

Vol 71 ◽

pp. 97-106 ◽

Cited By ~ 10

Author(s):

Mark Burkitt ◽

Clare Jones ◽

Andrew Lawrence ◽

Peter Wardman

Keyword(s):

Cytochrome C ◽

Hydroxyl Radical ◽

Redox Regulation ◽

Chemotherapeutic Agents ◽

Tyrosyl Radical ◽

Compound I ◽

Definitive Evidence ◽

Enhanced Production ◽

Physico Chemical

The release of cytochrome c from mitochondria during apoptosis results in the enhanced production of superoxide radicals, which are converted to H2O2 by Mn-superoxide dismutase. We have been concerned with the role of cytochrome c/H2O2 in the induction of oxidative stress during apoptosis. Our initial studies showed that cytochrome c is a potent catalyst of 2′,7′-dichlorofluorescin oxidation, thereby explaining the increased rate of production of the fluorophore 2′,7′-dichlorofluorescein in apoptotic cells. Although it has been speculated that the oxidizing species may be a ferryl-haem intermediate, no definitive evidence for the formation of such a species has been reported. Alternatively, it is possible that the hydroxyl radical may be generated, as seen in the reaction of certain iron chelates with H2O2. By examining the effects of radical scavengers on 2′,7′-dichlorofluorescin oxidation by cytochrome c/H2O2, together with complementary EPR studies, we have demonstrated that the hydroxyl radical is not generated. Our findings point, instead, to the formation of a peroxidase compound I species, with one oxidizing equivalent present as an oxo-ferryl haem intermediate and the other as the tyrosyl radical identified by Barr and colleagues [Barr, Gunther, Deterding, Tomer and Mason (1996) J. Biol. Chem. 271, 15498-15503]. Studies with spin traps indicated that the oxo-ferryl haem is the active oxidant. These findings provide a physico-chemical basis for the redox changes that occur during apoptosis. Excessive changes (possibly catalysed by cytochrome c) may have implications for the redox regulation of cell death, including the sensitivity of tumour cells to chemotherapeutic agents.

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