�ber Wachstum und Zusammensetzung von Chlorella pyrenoidosa bei unterschiedlichen Lichtst�rken und Nitratmengen

Aach, H. G.

doi:10.1007/bf00410827

Cited by 65 publications

(18 citation statements)

References 43 publications

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“…Laboratory experiments in which cultures of some diatoms (27,155) and unicellular green algae (1,35) were subjected to diurnal alternations of light and dark showed that cellular division occurred rhyth mically corresponding to the light and dark regime. In these laboratory ex periments, however, except for Scenedesmus grown under alternating light dark periods lasting 12 hr each3 (35), cellular division occurred, contrary to the ecological observations mentioned above, sometime during the light period.…”

Section: Introductionmentioning

confidence: 99%

“…Since reviews on earlier works made by the Japanese workers using C. ellipsoidea have been made elsewhere (41, [200][201][202]204), they will be dealt with as briefly as possible except when pertinent in making clear the differences in the methodology used or in the results obtained with other algae. For information on synchronous cultures 1 The survey of literature pertaining to this review was concluded in July 1965. ' trichloro acetic acid.…”

Section: Introductionmentioning

confidence: 99%

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Synchronous Cultures of Algae

Tamiya¹

1966

Annu. Rev. Plant. Physiol.

121

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synchronous Cultures of Algae

Tamiya¹

1966

Annu. Rev. Plant. Physiol.

121

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“…This corresponds to a 16,000-fold in crease of cell quantity per day (under continuous illumination). The efficiency of light-energy conversion also increases with temperature, but, unlike the rate of growth, it decreases with an increase in light intensity (19,65,66). The rate of growth (L) in the linear phase is usually expressed in terms of daily increase in grams (dry weight) of algae per square meter of illuminated surface.…”

Section: Introductionmentioning

confidence: 99%

Mass Culture of Algae

Tamiya¹

1957

Annu. Rev. Plant. Physiol.

205

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The necessary conditions for achieving vigorous algal growth are: (a) a supply of carbon dioxide and mineral nutrients in adequate concentrations, 1 The survey of literature pertaining to this review was concluded in June, 1956. 309 Annu. Rev. Plant. Physiol. 1957.8:309-334. Downloaded from www.annualreviews.org by University of Sussex on 10/22/12. For personal use only. Quick links to online content Further ANNUAL REVIEWS Annu. Rev. Plant. Physiol. 1957.8:309-334. Downloaded from www.annualreviews.org by University of Sussex on 10/22/12. For personal use only. MASS CULTURE OF ALGAE 311bolism have not been sufficiently investigated in connection with algal cul ture in sewage. Determination of the suitable relative concentration of each nutrient substance is a matter of importance in obtaining active growth of algae. While some species grow only within a narrow range of salt concen trations (52, 53), green algae such as ChIarella and Scenedesmus can grow with the same vigor over a wide range (54), a fact which makes these algae suit able for large scale mass culture. Nevertheless, to obtain steady growth in long range cultures measures must be taken to keep the concentrations of nutrients as well as that of hydrogen ions at suitable levels. The simplest way to achieve this may be to resuspend the algal cells in fresh medium at certain intervals (25). More rational is the replenishment method adopted by Krauss (33,56, 57), who added the elements to the solution at the same rate at which they were removed by the algae (Scenedesmus). The rate of removal of each element from the solution had been made clear by analyses of both nutrient media and algal cells. Different in principle are the steady-state culture techniques devised by Cook (28) and by Myers and co-workers (31, 36). These devices maintain a constant population in a container by means of a photoelectric ceH circuit which activates a solenoid valve allowing the en try of new medium. When the cell concentration increases above a prede termined point, fresh medium is automatically added, and the amount of overflow during a given period can then be used as a measure of growth. In their studies of algal culture in sewage, Gotaas et al. used two continuous culture techniques. One is a simple bubbling culture using a vertical glass cylinder (30, 58, 59). A definite volume of culture, depending upon the "de tention period" to be studied, was removed each day and was replaced by an equal volume of fresh sewage water. The other type of culture, using an apparatus called a "symbiocon" (60, 61), is a closed system in which algae and bacteria are maintained in symbiosis without supply of atmospheric air. Nutrient sewage is continuously added and an equivalent volume of the culture withdrawn at a constant rate. The difficulty of furnishing an adequate supply of microelements to the algae has been largely eliminated by the use of chelating agents which make possible concentrations of the elements higher than can otherwise be tol erated by the algae. Since Myers et al...

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“…Beijerinck (1904) stated that the effect of nitrogen deficiency in inducing fat accumulation is due to the fact that much deficiency prevents the synthesis of protoplasm without affecting assimilation to a similar extent, Therefore, the products of photosynthesis which would otherwise be used in protein and protoplasmic synthesis now appear äs non-nitrogenous reserve products such äs fats, On the otherhand, Spoehr& Milner(1949) showed that the effect of nitrogen deficiency on increasing fat content is a specific one since deficiency of phosphate, magnesium and potassium have been found not to have this effect, Also, Myers(1951) mentioned that fat accumulation takes place in many algae äs a response to the exhaustion of the nitrogen supply in the medium. Aach (1952) äs well, analysed samples from nitrogen limited Chlorella cultures at intervals during growth, and found that the fat content of the cells increased at the rate of 22 % on the second day, then to 70 % on the twenty fifth day. Fogg (1956Fogg ( , 1959 working with the diatom Navicula pellicuhsa studied the effects of light intensity and nitrogen supply on the formation of fats and reached the same conclusion.…”

Section: Discussionmentioning

confidence: 99%

Effect of Different Nitrogen Sources on Growth, Reproduction, Amino Acid, Fat and Sugar Contents in Ulva fasciata Delile (Part III)

Mohsen¹,

Khaleata²,

Hashem³

et al. 1974

Botanica Marina

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This investigation includes a study of the effect of some nitrogenous sources namely urea and potassium nitrate on the growth, reproduction, amino acid synthesis, fat and sugar Contents in Ulva fasciata plants. The results showed that Ulva fasciata plants preferred urea rather than nitrate for its growth and amino acid synthesis. Either urea or nitrate caused a fall in the total fat content, but sugars revealed a slight response. Rieh nitrogen supplies favoured asexual reproduction while the sexual reproduction was enhanced by nitrogen depletion.

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�ber Wachstum und Zusammensetzung von Chlorella pyrenoidosa bei unterschiedlichen Lichtst�rken und Nitratmengen

Cited by 65 publications

References 43 publications

Synchronous Cultures of Algae

Synchronous Cultures of Algae

Mass Culture of Algae

Effect of Different Nitrogen Sources on Growth, Reproduction, Amino Acid, Fat and Sugar Contents in Ulva fasciata Delile (Part III)

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