scholarly journals Frequency distribution studies of epipelic diatoms along an intertidal shore

1987 ◽  
Vol 41 (2) ◽  
pp. 139-148 ◽  
Author(s):  
Deborah R. Oppenheim
Keyword(s):  
Frequency Distribution ◽  
Epipelic Diatoms ◽  
Distribution Studies

PARASITES OF TROUT IN ALGONQUIN PROVINCIAL PARK, ONTARIO

1943 ◽  
Vol 21d (12) ◽  
pp. 405-412 ◽  
Author(s):  
D. A. MacLulich
Keyword(s):  
Frequency Distribution ◽  
Salvelinus Fontinalis ◽  
The Other ◽  
Kidney Cysts ◽  
Distribution Studies ◽  
Parasite Populations ◽  
Leptorhynchoides Thecatus ◽  
Provincial Park ◽  
Clinostomum Complanatum

The parasitism of trout in Algonquin Park, Ont., was studied during the spring and summer of 1939 to determine the distribution and abundance of parasites in the several species of trout. The sampling included 34 lakes from five different river drainages.A list of the parasites follows with the hosts indicated by the letters, C for Cristivomer namaycush Wahlbaum, S for Salvelinus fontinalis Linnaeus, and F for Salmo fario Linnaeus. Protozoa (cysts in kidneys),—CSF; trematodes: Crepidostomum farionis,—CS, Azygia angusticauda,—C, Clinostomum complanatum,—S, Neascus sp. (larvae),—S; cestodes: Diphyllobothrium sp. (larvae),—C, Eubothrium salvelini,—CS, Proteocephalus ambloplitis (larvae),—CS, Proteocephalus parallactics,—CSF, Proteocephalus pusillus,—C; nematodes: Cystidicola stigmatura,—CS, Philonema sp.,—C, unidentified larval nematodes,—CS, acanthocephala: Leptorhynchoides thecatus,—C; copepoda: Salmincola edwardsii,—S, Salmincola siscowet,—C.Two of the tapeworms, the two copepods, and the protozoan kidney cysts were generally distributed. The other parasites showed local differences in abundance. Frequency distribution studies of several of the parasite populations indicated that the parasites are not distributed randomly to the hosts.

scholarly journals Genetic variability and frequency distribution studies in F2 segregating generation of rice

2019 ◽  
Vol 10 (3) ◽  
pp. 988
Author(s):  
A. R. Priyanka ◽  
R. P. Gnanamalar ◽  
S. Banumathy ◽  
N. Senthil ◽  
G. Hemalatha
Keyword(s):  
Genetic Variability ◽  
Frequency Distribution ◽  
Distribution Studies

Cytopathology of Cardiac Tissue from Daunomycin-Treated Mice

1971 ◽  
Vol 29 ◽  
pp. 550-551
Author(s):  
Robert H. Liss ◽  
Frances A. Cotton
Keyword(s):  
Cardiac Tissue ◽  
Cardiac Toxicity ◽  
Drug Distribution ◽  
Personal Communication ◽  
Intravenous Dose ◽  
Single Intravenous Dose ◽  
Physiologic Saline ◽  
Histopathologic Changes ◽  
Distribution Studies ◽  
Lung And Kidney

Daunomycin, an antibiotic used in the clinical management of acute leukemia, produces a delayed, lethal cardiac toxicity. The lethality is dose and schedule dependent; histopathologic changes induced by the drug have been described in heart, lung, and kidney from hamsters in both single and multiple dose studies. Mice given a single intravenous dose of daunomycin (10 mg/kg) die 6-7 days later. Drug distribution studies indicate that the rodents excrete most of a single dose of the drug as daunomycin and metabolite within 48 hours after dosage (M. A. Asbell, personal communication).Myocardium from the ventricles of 6 moribund BDF1 mice which had received a single intravenous dose of daunomycin (10 mg/kg), and from controls dosed with physiologic saline, was fixed in glutaraldehyde and prepared for electron microscopy.

A Freeze Shadow Technique for the Preparation of Soft Paint Latexes for Electron Microscopy

1977 ◽  
Vol 35 ◽  
pp. 314-315
Author(s):  
Earl R. Walter ◽  
Glen H. Bryant
Keyword(s):  
Sample Preparation ◽  
High Vacuum ◽  
Vacuum System ◽  
Latex Particles ◽  
New Methods ◽  
Diffusion Pump ◽  
Film Forming ◽  
Routine Basis ◽  
Distribution Studies ◽  
Preparation Techniques

With the development of soft, film forming latexes for use in paints and other coatings applications, it became desirable to develop new methods of sample preparation for latex particle size distribution studies with the electron microscope. Conventional latex sample preparation techniques were inadequate due to the pronounced tendency of these new soft latex particles to distort, flatten and fuse on the substrate when they dried. In order to avoid these complications and obtain electron micrographs of undistorted latex particles of soft resins, a freeze-dry, cold shadowing technique was developed. The method has now been used in our laboratory on a routine basis for several years.The cold shadowing is done in a specially constructed vacuum system, having a conventional mechanical fore pump and oil diffusion pump supplying vacuum. The system incorporates bellows type high vacuum valves to permit a prepump cycle and opening of the shadowing chamber without shutting down the oil diffusion pump. A baffeled sorption trap isolates the shadowing chamber from the pumps.

Effects of Preloading of Stannous Compounds on the Distribution of 99mTc-Pertechnetate

1977 ◽  
Vol 16 (01) ◽  
pp. 26-29 ◽  
Author(s):  
D. D. Greenberg ◽  
P. Som ◽  
G. E. Meinken ◽  
D. F. Sacker ◽  
H. L. Atkins ◽  
...  
Keyword(s):  
Blood Cell ◽  
Red Blood Cell ◽  
Plasma Ratio ◽  
99Mtc Pertechnetate ◽  
Time Period ◽  
Stannous Ion ◽  
Distribution Studies

Summary 99mTc-pertechnetate distribution studies were performed in rabbits and mice following pretreatment between 5—336 hours with various routinely used stannous complexes (HSA, MAA, GHT, DTPA, PYPs) containing different amounts of Sn++ (0.17 —15.0 μ mg/kg). Beyond a concentration of 0.26 mg/kg of Sn++ an alteration in 99mTc-pertechnetate distribution was observed. The red blood cell was found to be the most prominent target. An in-vivo reduction of 99mTc-pertechnetate apparently occurred by the presence of stannous ion within the red blood cell. Preloading time period between 5—24 hours did not alter the uptake of RBC/plasma ratio. Beyond that period it decreased slowly and still persisted up to 2 weeks following pretreatment. RBC/ plasma ratio of 99mTcO4 - increased with increased Sn++ content of various commercially available pharmaceutical kits.

99mTc-Sn-Pyrophosphate Complexes, an Investigation of its Possible Structures

1974 ◽  
Vol 13 (03) ◽  
pp. 252-257 ◽  
Author(s):  
K. Rörvik - Schümichen ◽  
G. Hoffmann ◽  
C. Schümichen
Keyword(s):  
In Vivo Distribution ◽  
Low Concentrations ◽  
Distribution Studies

SummaryAt least two different 99mTc-Sn-pyrophosphate complexes are formed, as it is shown by comparative in vivo distribution studies: A 2 : 2 Sn : pyrophosphate complex is predominant at higher concentrations. Only this complex shows bone seeking properties. A 2 : 1 Sn : pyrophosphate complex exists only at low concentrations. This complex shows no deposition in bone but in the kidneys. Which complex is predominant depends on the pyrophosphate concentration in the equilibrium. Both complexes are rapidly excreted by the kidneys.

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