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Anomalous osmosis with gold beaters skin membranes, and the relation of osmosis to cell potential ...Madison, Orin Edward, January 1921 (has links)
Thesis (Ph. D.)--University of Michigan, 1919. / Bibliography: p. 39-40.
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Osmotic pressure measurements of glucose solutions at 30⁰, 40⁰, 50⁰ and 60⁰ ...Musselman, Amos Sentman, January 1915 (has links)
Thesis (Ph. D.)--Johns Hopkins University, 1915. / Biography.
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An investigation of manometers, of small bore, for use in the measurement of osmotic pressureCarpenter, John Lattimore, January 1911 (has links)
Thesis (Ph. D.)--Johns Hopkins University. / Biography.
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A study of electrosmosisStout, Lawrence Edward, January 1926 (has links)
Abstract of Thesis (Ph. D.)--Ohio state University, 1923. / Autobiography.
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A study of the semi-permeable membranes of zinc ferrocyanide and of copper cobalticyanide ...Holmes, Arthur Dunham, January 1911 (has links)
Thesis (PH. D.)--Johns Hopkins University. / Biographical note. Description based on print version record.
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The osmotic pressure of glucose solutions and the freezing point depressions and densities of solutions of glucose and cane sugar also some experiments on the osmotic pressure of urea solutions ...Hopkins, B. S. January 1906 (has links)
Thesis (Ph. D.)--Johns Hopkins University. / Biography.
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History and development of the deposition of copper ferrocyanide membrane by the electrolytic method ...Myers, Chester Newton, January 1911 (has links)
Thesis (Ph. D.)--Johns Hopkins University. / Biography.
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Osmoregulation and respiration in two corixid speciesJarial, Mohinder Singh January 1964 (has links)
The problems of, osmoregulation and oxygen consumption were Investigated In two species of Corixidae (Hemiptera), Cenocorixa bifida and C. expleta. Field collections support a distribution correlated with salinity. C. bifida and C. expleta acclimated to a range of different lake waters for three days showed a gain and loss of about five per cent body water in hypo and hyper-osmotic media when compared with their natural environment. Determinations of freezing point depression of blood showed that both species are able to maintain the osmotic pressure of their body fluids higher than that of the surrounding medium except in highly saline Gr₂ lake water. Both species became approximately iso-osmotic In Long lake water (concentration 435 mOs/1).
The results of this study Indicate that C. bifida and C. expleta can tolerate lake waters having as low as 5 and as high as 435 mOs/1 concentration under laboratory conditions and show no visible adverse effects. On transfer to media of lower concentration than the normal environment, C. expleta became swollen and sluggish. It appears that this species is unable to tolerate very low salinities. The results also Indicate that in Gr₂ water (concentration 753 mOs/1) the blood of both species becomes hypo-osmotic probably due to the breakdown of the hyperosmoregulatory mechanism, thus resulting in death.
The presence of filtered solution of amaranth and phenol red In different lake waters showed that these species drink water In hypo and hyper-osmotic media to obtain salts and water lost, in excretory products.
Sections of midgut showed swelling and vacuolation of epithelial cells in G. expleta when transferred to very low salinities like Spring House water. In highly concentrated Gr₂ lake water the midgut cells In both species were shrunken and detached from the basement membrane and in time they appeared to be completely broken down.
To maintain a difference of osmotic pressure between the body fluids and the surrounding medium both species do metabolic work. The measurement of respiratory rate by Warburg method and the periods of locomotory activity in nitrogen saturated media showed that both species consume more oxygen on transfer to lower and higher salinities than in their normal medium. These results suggest that both species are under osmotic stress and are doing increased metabolic work with the increasing osmotic gradient, but because of the difficulty in distinguishing this from activity, the latter may also be causing some increase in the respiratory rate.
The rate of oxygen consumption in the females of both species was found to be significantly higher than the male in all salinities. It is possible that this difference could be due to a greater expenditure of energy on egg maturation. / Science, Faculty of / Zoology, Department of / Graduate
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Design guidelines for a reverse osmosis desalination plant / Anton Michael HoffmanHoffman, Anton Michael January 2008 (has links)
There are two basic needs globally and that is the control and supply of
reliable electricity and clean water. However, one of the biggest challenges
the world is facing today is the lack of fresh water resources. Lower rainfall,
together with population and industry growth, are only a few factors
contributing to the fast increasing strain on existing water supplies around the
world. This fast increasing need therefore necessitates the investigation into
finding alternative sources. One such option is that of desalination. In the last
50 years desalination technologies have been applied to produce high quality
fresh water from brackish and seawater resources. In the 1980's a breakthrough
was made with the introduction of the membrane desalination
technology, known as the reverse osmosis (RO) process.
Today newly developed technologies are improving the competitiveness of the
reverse osmosis process against the traditional distillation processes. There
are a number of options to increase the efficiency of a reverse osmosis plant
and one option is to use warm industrial waste water as the feed water to the
desalination plant. It is known that the viscosity of water is inversely
proportional to its temperature. Therefore, if the feed water temperature of a
reverse osmosis plant is increased the membranes will become more
permeable. This will result in a higher production volume or in a lower energy
demand. South Africa is on the edge of building the first fourth generation
nuclear power plant, called the Pebble Bed Modular Reactor (PBMR) at
Koeberg. The PBMR will produce a cooling water outlet temperature of 40°C
which can be used as feed water to a reverse osmosis plant.
In this study design guidelines of a reverse osmosis plant are given in nine
steps. These steps were then used during a basic component design of a
reverse osmosis plant coupled to the waste water stream of a PBMR nuclear
power plant. Furthermore design software programs were used to simulate
the coupling scheme in order to validate the outcome of the design guidelines.
The results of the two design approaches compared well to one another. It
furthermore showed that by using the waste water from the PBMR nuclear
power plant the efficiency of the RO plant is increased and the operating cost
is decreased. Fresh water can be produced at a cost of R 5.64/m3 with a
specific electricity consumption of 2.53 kWh/m3. / Thesis (M.Ing. (Nuclear Engineering)--North-West University, Potchefstroom Campus, 2009.
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Design guidelines for a reverse osmosis desalination plant / Anton Michael HoffmanHoffman, Anton Michael January 2008 (has links)
There are two basic needs globally and that is the control and supply of
reliable electricity and clean water. However, one of the biggest challenges
the world is facing today is the lack of fresh water resources. Lower rainfall,
together with population and industry growth, are only a few factors
contributing to the fast increasing strain on existing water supplies around the
world. This fast increasing need therefore necessitates the investigation into
finding alternative sources. One such option is that of desalination. In the last
50 years desalination technologies have been applied to produce high quality
fresh water from brackish and seawater resources. In the 1980's a breakthrough
was made with the introduction of the membrane desalination
technology, known as the reverse osmosis (RO) process.
Today newly developed technologies are improving the competitiveness of the
reverse osmosis process against the traditional distillation processes. There
are a number of options to increase the efficiency of a reverse osmosis plant
and one option is to use warm industrial waste water as the feed water to the
desalination plant. It is known that the viscosity of water is inversely
proportional to its temperature. Therefore, if the feed water temperature of a
reverse osmosis plant is increased the membranes will become more
permeable. This will result in a higher production volume or in a lower energy
demand. South Africa is on the edge of building the first fourth generation
nuclear power plant, called the Pebble Bed Modular Reactor (PBMR) at
Koeberg. The PBMR will produce a cooling water outlet temperature of 40°C
which can be used as feed water to a reverse osmosis plant.
In this study design guidelines of a reverse osmosis plant are given in nine
steps. These steps were then used during a basic component design of a
reverse osmosis plant coupled to the waste water stream of a PBMR nuclear
power plant. Furthermore design software programs were used to simulate
the coupling scheme in order to validate the outcome of the design guidelines.
The results of the two design approaches compared well to one another. It
furthermore showed that by using the waste water from the PBMR nuclear
power plant the efficiency of the RO plant is increased and the operating cost
is decreased. Fresh water can be produced at a cost of R 5.64/m3 with a
specific electricity consumption of 2.53 kWh/m3. / Thesis (M.Ing. (Nuclear Engineering)--North-West University, Potchefstroom Campus, 2009.
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