On the Pigment Composition of Eleven Species of Marine Phytoplankters

1961 ◽  
Vol 18 (6) ◽  
pp. 1017-1025 ◽  
Author(s):  
T. R. Parsons
Keyword(s):  
Exponential Phase ◽  
Pigment Content ◽  
Marine Phytoplankton ◽  
Pigment Composition ◽  
Physical Conditions ◽  
Similar Chemical ◽  
Eleven Species

The amounts of different chlorophylls and carotenoids in eleven representatives of marine phytoplankton have been estimated. Representatives of the Chlorophyceae, Chrysophyceae, Bacillariophyceae, Dinophyceae and Myxophyceae were grown under similar chemical and physical conditions and their pigment content was determined during the exponential phase of growth. Particular attention was paid to the presence of chlorophyll c as well as to the identity of certain carotenoids.

Studies of the effects of small-scale turbulence on phytoplankton

1981 ◽  
Vol 61 (2) ◽  
pp. 477-488 ◽  
Author(s):  
G. Savidge
Keyword(s):  
Cell Division ◽  
Exponential Phase ◽  
Marine Phytoplankton ◽  
Small Scale ◽  
Agitation Rate ◽  
Mechanical Agitation ◽  
Batch Cultures ◽  
Final Yield ◽  
Lag Period ◽  
Scale Turbulence

Nutrient-limited batch cultures of two marine phytoplankton have been subjected to aeration and varying rates of mechanical agitation and the effects of growth and uptake of 14C and nutrients recorded. In both phosphate- and nitrate-limited cultures the lag period decreased with increasing agitation rate. Cell division times in the exponential phase decreased with increasing agitation of phosphate-limited cultures but increased in comparable nitrate-limited cultures. Division times were increased in all aerated cultures. The final yield of phosphorus-limited cultures was greatest at the highest agitation.

The origin of three garnet isograds in Adirondack gneisses

1965 ◽  
Vol 34 (268) ◽  
pp. 71-81 ◽  
Author(s):  
A. F. Buddington
Keyword(s):  
Chemical Composition ◽  
Partial Pressure ◽  
Quartz Syenite ◽  
Load Pressure ◽  
Similar Chemical Composition ◽  
Physical Conditions ◽  
Similar Chemical ◽  
High Partial Pressure ◽  
Increasing Temperature ◽  
Kinetics Of

SummaryThree isograds may be drawn, indicating increasing grades of metamorphism in the northern Adirondack area, based on the development of garnet successively in biotite-quartz-plagioclase paragneiss, metadolerite and metagabbro gneiss, and in syenite and quartz syenite orthogneisses. Changes in the accompanying minerals show that this is an order of increasing temperature. Rocks of similar chemical composition, suitable for the development of garnet, occur in each grade of metamorphism and geologic studies indicate adequate temperature and depth for the development of garnet even where it is not present. The degree of development of garnet in rocks of similar chemical composition, in even as high a grade as the pyroxene-granulite subfacies, is widely variable. All of the data are consistent with an hypothesis that the successive development of a garnetiferous facies for each of the different kinds of gneisses mentioned required special conditions that facilitated the kinetics of the reaction, such as temperature in excess of that for equilibria, in order for the garnet reaction to proceed. The data are not conclusive as to whether certain non-garnetiferous facies of amphibolites are due to the physical conditions (such as high partial pressure of H2O for the prevailing temperature and load pressure) or to non-equilibria.

On the Chemical Composition of Eleven Species of Marine Phytoplankters

1961 ◽  
Vol 18 (6) ◽  
pp. 1001-1016 ◽  
Author(s):  
T. R. Parsons ◽  
K. Stephens ◽  
J. D. H. Strickland
Keyword(s):  
Chemical Composition ◽  
Proximate Analysis ◽  
Marine Phytoplankton ◽  
Chemical Analyses ◽  
Whole Cells ◽  
Organic Composition ◽  
Principal Finding ◽  
Chemical Conditions ◽  
Physical And Chemical ◽  
Eleven Species

Eleven species of marine planktonic representatives of the Chlorophyceae, Chrysophyceae, Bacillariophyceae, Dinophyceae and Myxophyceae have been analyzed for their chemical composition. All species were grown under similar physical and chemical conditions and cells were analyzed during the exponential phase of growth. Chemical analyses consisted of a proximate analysis of each species for ash, protein, carbohydrate and lipid, and an analysis for carbon, silicon and phosphorus, as well as quantitative determinations of the monosaccharides and amino acids in hydrolysates of whole cells. The principal finding of this report is that marine phytoplankton have very similar organic composition when grown under similar physical and chemical conditions, regardless of the size of the organism or the class to which it belongs.

Effect of Vanadate and Iron Stress on the Pigment Composition of Chlorella fusca

1981 ◽  
Vol 36 (3-4) ◽  
pp. 207-209 ◽  
Author(s):  
Ludwig J. M. Becker ◽  
Hans-Ulrich Meisch
Keyword(s):  
Chlorophyll A ◽  
Pigment Content ◽  
Fe Deficiency ◽  
Iron Stress ◽  
Pigment Composition ◽  
Chlorella Fusca ◽  
Algal Pigment ◽  
Β Carotene

The pigment composition of Chlorella fusca has been investigated in the absence and in presence of vanadate and during iron stress. 1. Fe-deficiency generally decreases algal pigment content without change of the ratio chlorophyll a/b. 2. A twofold vanadate induced increase of the chlorophylls is accompanied by a similar enhancement of several xanthophylls, while lutein remains unaffected. 3. Vanadate stimulates the formation of β-carotene up to 5 fold, the effect being less obvious during iron stress

Influence of Magnetic Fields on Solar Hydrodynamics: Experimental Results

1977 ◽  
Vol 36 ◽  
pp. 143-180 ◽  
Author(s):  
J.O. Stenflo
Keyword(s):  
Solar Activity ◽  
Energy Balance ◽  
Magnetic Fields ◽  
Solar Atmosphere ◽  
General Problem ◽  
Solar Rotation ◽  
Active Regions ◽  
Physical Conditions ◽  
Dynamic Phenomena

It is well-known that solar activity is basically caused by the Interaction of magnetic fields with convection and solar rotation, resulting in a great variety of dynamic phenomena, like flares, surges, sunspots, prominences, etc. Many conferences have been devoted to solar activity, including the role of magnetic fields. Similar attention has not been paid to the role of magnetic fields for the overall dynamics and energy balance of the solar atmosphere, related to the general problem of chromospheric and coronal heating. To penetrate this problem we have to focus our attention more on the physical conditions in the ‘quiet’ regions than on the conspicuous phenomena in active regions.

Venation pattern of eleven species ofTephrosia

1986 ◽  
Vol 97 (7-8) ◽  
pp. 475-478
Author(s):  
R. P. Bhatt ◽  
S. K. Tuteja
Keyword(s):  
Venation Pattern ◽  
Eleven Species

Platelet Aggregation Induced in Vitro by Therapeutic Ultrasound

1977 ◽  
Vol 38 (03) ◽  
pp. 0640-0651 ◽  
Author(s):  
B. V Chater ◽  
A. R Williams
Keyword(s):  
Platelet Aggregation ◽  
Direct Action ◽  
Adenosine Diphosphate ◽  
Ultrasonic Cavitation ◽  
Related Phenomenon ◽  
Release Reaction ◽  
Physical Conditions ◽  
Platelet Aggregates ◽  
Active Substances

SummaryPlatelets were found to aggregate spontaneously when exposed to ultrasound generated by a commercial therapeutic device. At a given frequency, aggregation was found to be a dose-related phenomenon, increasing intensities of ultrasound inducing more extensive and more rapid aggregation. At any single intensity, the extent aggregation was increased as the frequency of the applied ultrasound was decreased (from 3.0 to 0.75 MHz).Ultrasound-induced platelet aggregation was found to be related to overall platelet sensitivity to adenosine diphosphate. More sensitive platelets were found to aggregate spontaneously at lower intensities of sound, and also the maximum extent of aggregation was found to be greater. Examination of ultrasound-induced platelet aggregates by electron microscopy demonstrated that the platelets had undergone the release reaction.The observation that haemoglobin was released from erythrocytes in whole blood irradiated under identical physical conditions suggests that the platelets are being distrupted by ultrasonic cavitation (violent gas/bubble oscillation).It is postulated that overall platelet aggregation is the result of two distinct effects. Firstly, the direct action of ultrasonic cavitation disrupts a small proportion of the platelet population, resulting in the liberation of active substances. These substances produce aggregation, both directly and indirectly by inducing the physiological release reaction in adjacent undamaged platelets.

The Design Medan Concert Hall with Metaphor Architecture Approach

2020 ◽  
Vol 4 (1) ◽  
pp. 54-61
Author(s):  
Vinky Rahman ◽  
Muhammad Khairy Humaizy
Keyword(s):  
Secondary Data ◽  
Building Design ◽  
Traditional Music ◽  
Primary Data ◽  
Support Design ◽  
Physical Conditions ◽  
Sound Control ◽  
Strategic Location ◽  
Big City ◽  
Design Ideas

The theater usually has an attractive form to attract the attention of visitors and also has good sound control in the auditorium so as not to cause sound distortion. Performances in Medan are still inadequate to accommodate international performances. Particularly in Medan, the enthusiasm of the community towards art tends to be high, but the facilities of the place lack to accommodate performances. Data collection methods are carried out by collecting primary data through a process of field comparative study and secondary data through literature studies & comparative studies. The design approach used in design studies are analyzing the physical, conditions around the site, potential, the limits that exist on the site, Site and environmental approaches are analysis of site conditions and the best solutions, the user approach is building analysis to meet the need for facilities and quality in accommodating the show, literature studies related to titles and themes and theories that support design ideas. The Metaphor is chosen as a truss design theme to convey the shape of building design by combining metaphorical forms of buildings and the prominence of the same metaphorical theme in the building to those who visit and see buildings to prevent sound distortions by using porous materials. Medan is a big city in Indonesia as a design area with consideration of a strategic location. It is expected that with the presence of this performance center, domestic and foreign tourists and especially Medan people themselves can enjoy the comfort and get to know traditional music and dance in Indonesia.

Larval Behavior and Protective Implications for Sea Scallops and Surf Clams within the Middle Atlantic Bight: Part Two, Variability of Physical Environment and Larval Behaviors

2019 ◽  
Vol 2 (2) ◽  
Keyword(s):  
Physical Environment ◽  
Climate Changes ◽  
Larval Growth ◽  
Growth Patterns ◽  
Larval Behavior ◽  
Larval Release ◽  
Physical Conditions ◽  
Climatic Variations ◽  
Middle Atlantic ◽  
Sea Scallops

Larval growth and settlement rates are important larval behaviors for larval protections. The variability of larval growthsettlement rates and physical conditions for 2006-2012 and in the future with potential climate changes was studied using the coupling ROMS-IMBs, and new temperature and current indexes. Forty-four experimental cases were conducted for larval growth patterns and release mechanisms, showing the spatial, seasonal, annual, and climatic variations of larval growthsettlement rates and physical conditions, demonstrating that the slight different larval temperature-adaption and larval release strategies made difference in larval growth-settlement rates, and displaying that larval growth and settlement rates highly depended upon physical conditions and were vulnerable to climate changes.

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