Browsing Fiskeridirektoratets skrifter. Serie Teknologiske undersøkelser by Author "Brækkan, Olaf R."
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A Comparative Study of Amino Acids in the Muscle of Different Species of Fish
Brækkan, Olaf R.; Boge, Gjermund (Fiskeridirektoratets skrifter / Serie Teknologiske undersøkelser;Vol. 4, No. 3, Research report, 1962)1. The complete amino acid composition in the muscles of ten common food fishes has been investigated by microbiological methods. Each amino acid was determined simultaneously in all samples, thus making a direct comparison ... -
A Comparative Study of Vitamins in the Trunk Muscles of Fishes
Brækkan, Olaf R. (Fiskeridirektoratets skrifter / Serie Teknologiske undersøkelser;Vol. 3, No. 8, Research report, 1959)A comparative study of vitamins in the trunk muscles of fishes is reported. The investigation comprises two separate studies. Firstly, the relation between the activity of different species and the average vitamin contents ... -
Alpha-Tocopherol in Some Marine Organisms and Fish Oils
Brækkan, Olaf R.; Lambertsen, Georg; Myklestad, Håkon (Fiskeridirektoratets skrifter / Serie Teknologiske undersøkelser;Vol. 4, No. 8, Research report, 1963)A study has been made of a-tocopherol in some marine sources. Apart from commercial oils, which were of normal quality, care was taken to ensure fresh material. The a-tocopherol contents have been determined in eleven ... -
Bestemmelse av vitamin A i traner og vitaminoljer. En sammenliknende undersøkelse av forskjellige metoder
Brækkan, Olaf R.; Lambertsen, Georg (Fiskeridirektoratets skrifter / Serie Teknologiske undersøkelser;Vol. 2, No. 9, Research report, 1952)Since the World Health Organizations subcomittee on Fat-Soluble Vitamins published their recommendations for the determination of vitamin A (21), new methods based on their recommendations have been adopted by U.S.P. XIV ... -
Effect of BHT (Butylated Hydroxytoluene) on the protein value of herring meal for the young rat
Njaa, Leif Rein; Utne, Finn; Brækkan, Olaf R. (Fiskeridirektoratets skrifter / Serie Teknologiske undersøkelser;Vol. 5, No. 2, Research report, 1966)The effect of BHT (butylated hydroxytoluene) on the protein quality of herring meal was studied in nitrogen balance experiments with young rats. BHT at the 0.03% level in the meal improved the protein quality of meals ... -
Foring av rotter med natriumnitrit og sildemel fremstilt av sild konservert med natriumnitrit
Njaa, Leif Rein; Brækkan, Olaf R. (Fiskeridirektoratets skrifter / Serie Teknologiske undersøkelser;Vol. 2, No. 14, Research report, 1953)The effect on rats of feeding sodium nitrite and herring meal produced from sodium nitrite treated herring, has been investigated. The results are in agreement with the findings of TARR & CARTER (1942). In the present ... -
Further studies on Vitamins and the Reproductive Cycle of Ovaries In Cod (Gadus morrhua)
Brækkan, Olaf R.; Boge, Gjermund (Fiskeridirektoratets skrifter / Serie Teknologiske undersøkelser;Vol. 4, No. 2, Research report, 1962)The relations between vitamin B6, vitamin B12, biotin and total dry matter and the reproductive cycle of the ovaries in cod has been investigated. The stage of maturation or regeneration was expressed as the percentage ... -
Growth Inhibitory Effect of Extracts from Milt (Testis) of Different Fishes and of Pure Protamines on Microorganisms
Brækkan, Olaf R.; Boge, Gjermund (Fiskeridirektoratets skrifter / Serie Teknologiske undersøkelser;Vol. 4, No. 6, Research report, 1964)A method has been described for the isolation of protamine from the milt (testes) of fish, employing direct extraction of the organ with dilute sulfuric acid, followed by stepwise precipitation with ethanol. The growth ... -
Influence of dietary fat on the fatty acid pattern of muscle and liver lipids in rainbow trout (Sabno gairdneri)
Brækkan, Olaf R.; Lambertsen, Georg; Andresen, J. (Fiskeridirektoratets skrifter / Serie Teknologiske undersøkelser;Vol. 5, No. 8, Research report, 1971)Groups of one year old rainbow trout (Salmo gairdneri) were fed diets supplemented with 13% of rape seed oil, olive oil, linseed oil or sunflower seed oil. The fishes were kept in fresh water of a temperature about 10°C ... -
Protein value of cod and coalfish and some products for the young rat
Njaa, Leif Rein; Utne, Finn; Brækkan, Olaf R. (Fiskeridirektoratets skrifter / Serie Teknologiske undersøkelser;Vol. 5, No. 4, Research report, 1968)The protein quality of cod muscle protein and of some products of cod and coalfish was determined in nitrogen balance experiments with young rats. In most of the experiments spray dried egg albumin was used as a standard ... -
Protein value of herring meal and some other protein concentrates of marine origin for the young rat
Njaa, Leif Rein; Utne, Finn; Brækkan, Olaf R. (Fiskeridirektoratets skrifter / Serie Teknologiske undersøkelser;Vol. 5, No. 1, Research report, 1966)Protein concentrates, mainly of marine origin, were tested in nitrogen balance experiments with young rats. Commercial herring meals produced by several methods showed only small differences in protein utilization values. ... -
Removal of DDT and its Metabolites from Fish Oils by Molecular Distillation
Julshamn, Kåre; Karlsen, L.; Brækkan, Olaf R. (Fiskeridirektoratets skrifter / Serie Teknologiske undersøkelser;Vol. 5, No. 15, Research report, 1973)The distribution of DDT and its metabolities in cod liver oil and some other marine oils are reported. Cod liver oil showed an average content of (1.50 ± 0.31) mg DDT/kg. Dogfish liver oil contained 2.44 mg DDT/kg, and ... -
Studies on the radiation preservation of fish I. The Effect on Certain Vitamins in Fresh Fillets of Cod and Dogfish and in Smoked Fillets of Cod and Herring
Mameesh, M. S.; Boge, Gjermund; Brækkan, Olaf R. (Fiskeridirektoratets skrifter / Serie Teknologiske undersøkelser;Vol. 4, No. 10, Research report, 1964)The effect of radiopasteurization (0.3 Mrad) and radiosterilization (3.0 Mrad) on certain vitamins in canned fresh fillets of cod and dogfish and in vacuum packed smoked cod and herring, were studied. The effect of ... -
The amino acid composition and the protein value of four selected fish meals for the young chick
Njaa, Leif Rein; Utne, Finn; Boge, Gjermund; Brækkan, Olaf R. (Fiskeridirektoratets skrifter / Serie Teknologiske undersøkelser;Vol. 5, No. 5, Research report, 1968)A winter herring meal, a North Sea herring meal, a scad meal and a mackerel meal were tested as supplements to a basal vegetable chick diet and were analyzed for amino acids, vitamins and the common chemical constituents. ... -
The Effect of Some Marine Oils and Squalene on the Plasma Cholesterol in Chicks
Brækkan, Olaf R.; Njaa, Leif Rein; Utne, Finn (Fiskeridirektoratets skrifter / Serie Teknologiske undersøkelser;Vol. 4, No. 4, Research report, 1962)The effect of some fish oils on the plasma-cholesterol level of chicks were studied in eleven experiments. Soya- bean oil, margarine fat and squalene were also included in the study. Arachis oil was used as a reference in ... -
The fatty acid composition of cod liver oil
Lambertsen, Georg; Brækkan, Olaf R. (Fiskeridirektoratets skrifter / Serie Teknologiske undersøkelser;Vol. 4, No. 11, Research report, 1965)The fatty acid composition has been determined using group separation by thin layer partition chromatography in conjunction with gas liquid chromatography. Values are given for 41 acids as percentages of the sum varying ... -
The fatty acid composition of herring oils
Lambertsen, Georg; Brækkan, Olaf R. (Fiskeridirektoratets skrifter / Serie Teknologiske undersøkelser;Vol. 4, No. 13, Research report, 1965)Herring oil production in different areas of the world has been reviewed, and the possible variations of the fatty acid composition has been discussed. The literature on the determination of fatty acids in such oils has ... -
Vitaminer i Norsk fisk I. Nikotinsyre-, riboflavin-, pantotensyre-, vitamin B12- og vitamin A-innholdet i hel fisk og forskjellige organer fra fersk sild (Clupea harengus) og makrell (Scomber scombrus).
Brækkan, Olaf R.; Probst, Ada (Fiskeridirektoratets skrifter / Serie Teknologiske undersøkelser;Vol. 2, No. 13, Research report, 1953)Fresh samples of herring and mackerel were collected during respectively February and May 1952. The samples were minced or homogenized and stored at - 15° C during the investigations. Niacin, riboflavine and pantothenic ... -
Vitaminer i Norsk fisk II. Vitaminer i forskjellige organer fra makrellstørje (Thunnus Thynnus) fanget utenfor Norges vestkyst.
Brækkan, Olaf R. (Fiskeridirektoratets skrifter / Serie Teknologiske undersøkelser;Vol. 3, No. 3, Research report, 1955)Fresh samples of different organs from tuna fish (Thunnus thynnus) were collected during the summer 1952. The samples represented 100 -150 fishes and were minced and stored at -15° C during the investigation. Niacin, ... -
Vitaminer i Norsk fisk III. Vitaminer i forskjellige organer fra de viktigste torskefisker (Gadidae) fanget langs Norskekysten
Brækkan, Olaf R. (Fiskeridirektoratets skrifter / Serie Teknologiske undersøkelser;Vol. 3, No. 6, Research report, 1958)Cod (Gadus morrhua), coalfish (Gadus virens), pollack (Gadus pollachius), haddock (Gadus æglefinus), ling (Molva molva) and torsk (Brosmius brosme) have been investigated. Fresh samples were collected, usually from alive ...