ZIB

Hits per page

hits 1 - 2 | 2 hits

Sorting

Electronic Resource

Plankton communities of three Central Florida lakes (1976)

Nordlie, Frank G.

Springer

Hydrobiologia 48 (1976), S. 65-78

add to mindlist on the mindlist

Details

ISSN: 1573-5117

Keywords: Plankton ; primary productivity ; zooplankton ; central Florida

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract A study of planktonic primary productivity and community structure was carried out on three lakes of varying morphometric and chemical features, but which were within a single watershed in Central Florida. Primary productivity in these lakes was evaluated by means of in situ light and dark bottle determinations as well as by calculations based upon chlorophyll and light data. Lake Mize, a deep sinkhole lake containing highly colored waters of low pH, proved to be a very unproductive lake, while Biven's Arm, a shallow-basin lake with alkaline waters and Newnan's lake, a shallow-basin like with highly colored waters both showed relatively high productivities. Phytoplankton components of the two productive lakes were quite similar to one another in being composed of bloom-forming blue-green and green algae, while the predominant forms in Lake Mize were chrysophytes, dinoflagellates and a diatom. Zooplanktonic forms were more uniform among the lakes than were the phytoplankton, though population levels reflected relative productivities among the lakes. Rotifers predominated in the Lake Mize plankton while cladocerans were relatively inabundant. This was opposite to the condition in Biven's Arm and Newnan's Lake. It is suggested that the constant presence of larval Chaoborus in the water column in Lake Mize may be partially responsible for the paucity of cladocera.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00033492

Permalink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

Measurements of vapor sorption/desorption properties of ultrathin polymeric filmsPresented at Division of Polymer Chemistry, American Chemical Society Meeting, New Orleans, Louisiana, March 1977. (1979)

Belli, Frank G. ; Buckley, David A.

New York, NY [u.a.] : Wiley-Blackwell

Journal of Applied Polymer Science 23 (1979), S. 1795-1802

add to mindlist on the mindlist

Details

ISSN: 0021-8995

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: After a brief review of various standard methods of diffusion measurements of vapors into and out of polymeric solids, a direct gravimetric method for studying the sorption/desorption process in thin polymer films is discussed. The apparatus used consisted of a sensitive electrical balance housed in a vacuum pump. The sorption and desorption characteristics of thick polystyrene films were studied for comparison with literature values. The system polystyrene/methylene chloride was chosen to calibrate the system because of its known data. Experiments were carried out using the polystyrenes PS-5 and Dow Trycite 1000 at 35 and 50 mm Hg. Results agreed well with those reported in the literature. The apparatus was also suitable for measuring the very initial uptake of vapor. This information is important in the study of very thin films where the amount of vapor absorbed is minimum and the initial rate of uptake is almost instantaneous.

Additional Material: 7 Ill.