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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Inorganic chemistry 10 (1971), S. 1566-1570 
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 102 (1980), S. 2847-2848 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Chemical reviews 73 (1973), S. 407-440 
    ISSN: 1520-6890
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Chemical reviews 76 (1976), S. 563-592 
    ISSN: 1520-6890
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 37 (1972), S. 4278-4281 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 45 (1980), S. 4515-4515 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 25 (1971), S. 0 
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Two tomato cultivars, T3238 (B-inefficient) and Rutgers (B-efficient), were grown in solution cultures with increasing concentrations of B. Rutgers was about 15 times more efficient than T3238 in utilizing the B in the growth medium. Rutgers translocated more B to top leaves than the inefficient T3238. When plants developed B-deficiency symptoms, there was no evidence of B redistribution between tissues. Reciprocal grafts of T3238 and Rutgers demonstrate root control of B transport.
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 30 (1974), S. 0 
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: When Fe-inefficient T3238fer and Fe-efficient T3238FER tomatoes were supplied iron, and nitrogen as nitrate, they increased the pH of the nutrient culture. When they were supplied nitrogen as ammonium, they decreased the pH. When Fe supply was limited, Fe-stress response developed in T3238FER that opposed the usual nitrate response and decreased, rather than increased, the pH. A “reductant” which reduced Fe3+ to Fe2+ was released from the roots of these plants and lowered the pH; and there was a tremendous increase in the uptake of Fe. T3238fer did not produce “reductant” in response to Fe-stress; the pH increased, and the plants developed Fe-deficiency when nitrogen was supplied as nitrate. Nitrogen nutrition and iron-stress response are important factors associated with iron chlorosis in plants. Release of hydrogen ions from roots of Fe-stressed plants is caused by more than response to imbalanced uptake of cations and anions.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Helgoland marine research 20 (1970), S. 62-69 
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary 1. Growth and development of algae from spores has been observed in the laboratory (Menai Bridge) and under field conditions at Ravenspoint (West coast of Anglesey). Attempts were made to culture all main components of the sub-littoral flora. Spore material was obtained from spores allowed to settle onto plastic slides in the laboratory sea water system and from spores settled on slides stationed in the field. 2. Attention was given to the summer annual species and, in particular, to those members of the Nemalionales (Rhodophyceae) which have incompletely known life histories. In these plants, the tetrasporic phase during which reduction division normally takes place, has so far been undetected in the field. The plants are represented by the cystocarpic phase of the life cycle only. 3. The fate of the carpospores of these species were of particular interest. The spores of the annual species were cultivated under a number of regimes of irradiation and temperature. Sporelings from laboratory culture were transferred to the field in November, 2 months after settlement. Both in laboratory and field, the form of development of the cultures were similar until May of the following year. Then the field cultures developed structures which may represent the tetrasporangia of the alternate phase. These structures failed to develop in the laboratory cultures after 3 years. 4. The results of these experiments illustrate that care must be taken in interpreting results of laboratory cultures of algae, in particular in regard to their life histories.
    Notes: Kurzfassung Der Aspekt der sublitoralen Algenvegetation vor der Küste von Ravenspoint (Westküste von Anglesey) wird entscheidend von der mechanischen Wellenwirkung, der Trübung des Wassers und der Sedimentierung geprägt. Auf den durch die Winterstürme stark verlagerten und abgescheuerten Steinen in 4 m Tiefe dicht unter der Küste kann sich erst ab April-Mai eine üppige Vegetation annueller Arten entwickeln. In 9 m Tiefe überstehen nur derbere Formen wieChondrus oderFurcellaria die winterliche Sedimentablagerung. Hier stellen sich in den Somermonaten außer den auch in 4 m vorkommenden Arten einjährige Rotalgen wieNaccaria, Halarachnion, Scinaia undHelminthora ein. Zur Klärung ihrer Ökologie und Lebensgeschichte wurden Steine ins Laboratorium verbracht und der sich entwickelnde Aufwuchs untersucht, außerdem Kulturen dieser Arten auf Objektträgern im Laboratorium und am natürlichen Standort verglichen. Besonderes Interesse verdienen Vertreter der Nemalionales (Rhodophyceae), in deren Lebenszyklus bisher nur die karposporentragende Phase bekannt ist. Zwei Monate alte Kulturen vonNaccaria wurden im November aus dem Laboratorium an ihren natürlichen Standort gebracht. Nach gleichartiger Entwicklung bis zum Mai des folgenden Jahres bildeten sie Strukturen, die vielleicht der tetrasporentragenden Phase entsprechen. Solche Stadien wurden während der dreijährigen Kultur im Laboratorium nicht beobachtet. Daher ist eine kritische Beurteilung der an Laboratoriumskulturen erhaltenen Ergebnisse angezeigt, besonders bei der Untersuchung des Lebenszyklus von Algen. Die Zellenanordnung junger Corallinaceen-Krusten zeigte charakteristische Unterschiede, die vielleicht als taxonomische Kriterien verwertbar sind.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Helgoland marine research 20 (1970), S. 70-78 
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary 1. A description is given of a re-circulating sea water system used to supply water for the culture of algae. Sea water is stored in two large storage tanks. From these, water is pumped to a header tank and then flows by gravity to experimental benches in the laboratory. After use, water is returned to the storage tanks. Nontoxic materials are used throughout the system. 2. It is not possible to control the temperature of the laboratory sea water. Although the temperature fluctuation of the laboratory sea water and the surface water of the Menai Straits follow a similar pattern throughout the year, the temperature of the laboratory sea water was always higher than that of the Menai Straits for the year 1967–1968. The difference between the two water masses is least (0.6°–1.8° C) from September–December and greatest (3.0°–4.6° C) from January to March. From April to August the difference varies from 2.4°–3.6° C. 3. Suspended matter is removed from the sea water by allowing sedimentation to occur in the storage tanks and by means of simple filters. 4. The principal disadvantage of using this type of system is the inevitable contamination of cultures by organisms present in the water. The number and species of contaminants depended on the season and the amount of illumination they received.Prasinocladus marinus (Cienk.)Waern.,Pringsheimiella scutata (Reinke)Marchew.,Enteromorpha spp., various diatoms and filamentous and encrusting Phaeophyceae were the main contaminants above 1,075 lux. At intensities below this, species of Cyanophyceae were the main contaminants. 5. The sea water system described has been found satisfactory for the culture of algae for experiments of short duration, and for keeping algae in a healthy condition for long periods.
    Notes: Kurzfassung Ein re-zirkulierendes Seewassersystem, das der Kultivierung von Algen unter weitgehend natürlichen Umweltbedingungen dient, wird beschrieben. Vor- und Nachteile dieses Systems werden dargelegt. Als ungünstig erwiesen sich die jahreszeitlich bedingten Veränderungen der Wassertemperatur, die Anwesenheit verschiedener mariner Begleitorganismen sowie die Ablagerungen von Sediment. Das größte Hindernis für die Erhaltung weitgehend reiner Kulturen war das Vorhandensein von Diatomeen und anderer einzelliger Algen, deren Entfernung große Schwierigkeiten bereitete. Die Zahl und Artenzusammensetzung der Algen, welche die Kulturen in unerwünschter Weise bevölkerten, änderten sich in Abhängigkeit von der Jahreszeit und der Lichtintensität. Das beschriebene Kultursystem wurde benutzt, um die Wirkung des Lichts auf das Wachstum junger Rotalgenthalli zu untersuchen. Für kurzfristige Experimente erwies sich die hier erprobte Kulturmethode als sehr befriedigend. Die Bedeutung dieser Methode für die experimentelle Taxonomie sowie generell für die Hälterung von Algen im Labor wird herausgestellt.
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