scholarly journals The Effect of Manganese Sulphate on the Stability of Vitamins A and D of Cod Liver Oil When Stored in Mixed Feeds

1942 ◽  
Vol 21 (3) ◽  
pp. 200-202 ◽  
Author(s):  
M. Wayne Miller ◽  
V. Joukovsky ◽  
Norman Hokenstad
Keyword(s):  
Cod Liver Oil ◽  
Manganese Sulphate ◽  
The Stability ◽  
Mixed Feeds

scholarly journals The Stability of Vitamin A from Cod Liver Oil in Mixed Feeds

1939 ◽  
Vol 18 (5) ◽  
pp. 345-349 ◽  
Author(s):  
R.C. Holder ◽  
S.K. Ford
Keyword(s):  
Vitamin A ◽  
Cod Liver Oil ◽  
The Stability ◽  
Mixed Feeds

scholarly journals The Influence of Tocopherols and Cod Liver Oil on the Stability of Milk

1949 ◽  
Vol 32 (3) ◽  
pp. 196-201 ◽  
Author(s):  
Vladimir N. Krukovsky ◽  
J.K. Loosli ◽  
Frank Whiting
Keyword(s):  
Cod Liver Oil ◽  
The Stability

Studies on the Stability of Chlortetracycline in Mixed Feeds: Epimerization of Chlortetracycline

1967 ◽  
Vol 50 (4) ◽  
pp. 821-827
Author(s):  
Stanley E Katz ◽  
Carol A Fassbender
Keyword(s):  
Aqueous Solution ◽  
Strong Acid ◽  
Unknown Compound ◽  
Weakly Acid ◽  
Moisture Contents ◽  
Ph Values ◽  
Feed Protein ◽  
The Stability ◽  
Mixed Feeds ◽  
Significant Data

Abstract Chlortetracycline is known to degrade in aqueous solution by four pathways: anhydrochlortetracycline formation under strong acid conditions, epimerization under weakly acid conditions, isochlortetracycline formation under strongly basic conditions (usually anaerobic), and formation of a desdimethylamino chlortetracycline compound under aerobic conditions at pH values greater than 5. Studies on feeds decomposed to 50% of activity indicated that isochlortetracycline and anbydrochlortetracycline were not formed in the decomposition, while epichlortetracycline and a highly fluorescent unknown compound were formed. Epimerization occurs rapidly in feeds, reaching an equilibrium in a few hours. In several types of feed, protein, fat, fiber, moisture contents, and pH did not affect the degree of epimerization. Temperature of storage appears to be significant. Data suggest that an equilibrium is established between the chlortetracycline and epichlortetracycline followed by breakdown of either chlortetracycline or its epimer or both to as yet unidentified products.

The stability of vitamin A in cod-liver oil emulsions

The Analyst ◽  
1933 ◽  
Vol 58 (683) ◽  
pp. 65 ◽  
Author(s):  
H. N. Griffiths ◽  
T. P. Hilditch ◽  
J. Rae
Keyword(s):  
Vitamin A ◽  
Cod Liver Oil ◽  
Oil Emulsions ◽  
The Stability

scholarly journals The Stability of Vitamin A in Mixed Feeds and Premixes

1955 ◽  
Vol 34 (3) ◽  
pp. 603-608 ◽  
Author(s):  
B.L. Reid ◽  
H.K. Daugherty ◽  
J.R. Couch
Keyword(s):  
Vitamin A ◽  
The Stability ◽  
Mixed Feeds

Open discussion

1982 ◽  
Vol 99 ◽  
pp. 605-613
Author(s):  
P. S. Conti
Keyword(s):  
Buenos Aires ◽  
Large Mass ◽  
List Type ◽  
Common Phenomenon ◽  
Open Discussion ◽  
The Stability ◽  
Ring Nebulae

Conti: One of the main conclusions of the Wolf-Rayet symposium in Buenos Aires was that Wolf-Rayet stars are evolutionary products of massive objects. Some questions:–Do hot helium-rich stars, that are not Wolf-Rayet stars, exist?–What about the stability of helium rich stars of large mass? We know a helium rich star of ∼40 MO. Has the stability something to do with the wind?–Ring nebulae and bubbles : this seems to be a much more common phenomenon than we thought of some years age.–What is the origin of the subtypes? This is important to find a possible matching of scenarios to subtypes.

Symmetric Multistep Methods Revisited: II. Numerical Experiments

1999 ◽  
Vol 173 ◽  
pp. 309-314 ◽  
Author(s):  
T. Fukushima
Keyword(s):  
Multistep Methods ◽  
Computational Time ◽  
Integration Time ◽  
Implicit Methods ◽  
Symmetric Methods ◽  
Celestial Bodies ◽  
The Stability ◽  
Predictor Corrector ◽  
Symmetric Multistep Methods ◽  
Integration Errors

AbstractBy using the stability condition and general formulas developed by Fukushima (1998 = Paper I) we discovered that, just as in the case of the explicit symmetric multistep methods (Quinlan and Tremaine, 1990), when integrating orbital motions of celestial bodies, the implicit symmetric multistep methods used in the predictor-corrector manner lead to integration errors in position which grow linearly with the integration time if the stepsizes adopted are sufficiently small and if the number of corrections is sufficiently large, say two or three. We confirmed also that the symmetric methods (explicit or implicit) would produce the stepsize-dependent instabilities/resonances, which was discovered by A. Toomre in 1991 and confirmed by G.D. Quinlan for some high order explicit methods. Although the implicit methods require twice or more computational time for the same stepsize than the explicit symmetric ones do, they seem to be preferable since they reduce these undesirable features significantly.

Uniformity of Magnification from Different Electron Microscopes

1967 ◽  
Vol 25 ◽  
pp. 32-33
Author(s):  
Godfrey C. Hoskins ◽  
V. Williams ◽  
V. Allison
Keyword(s):  
Diffraction Grating ◽  
The Other ◽  
Carbon Replica ◽  
Electron Microscopes ◽  
The Stability

The method demonstrated is an adaptation of a proven procedure for accurately determining the magnification of light photomicrographs. Because of the stability of modern electrical lenses, the method is shown to be directly applicable for providing precise reproducibility of magnification in various models of electron microscopes.A readily recognizable area of a carbon replica of a crossed-line diffraction grating is used as a standard. The same area of the standard was photographed in Phillips EM 200, Hitachi HU-11B2, and RCA EMU 3F electron microscopes at taps representative of the range of magnification of each. Negatives from one microscope were selected as guides and printed at convenient magnifications; then negatives from each of the other microscopes were projected to register with these prints. By deferring measurement to the print rather than comparing negatives, correspondence of magnification of the specimen in the three microscopes could be brought to within 2%.

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