ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    ISSN: 1432-203X
    Keywords: Key words Sweet potato ; Somatic embryogenesis ; Auxin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Culture procedures have been developed to facilitate the induction and maintenance of somatic embryogenic tissues in 14 out of 16 tested cultivars of sweet potato [Ipomoea batatas (L.) Lam]. Both the size of the axillary bud explant and the type of auxin were found to be critical for the successful induction of somatic embryogenesis. Of the five auxins screened 2,4-dichlorophenoxyacetic acid 2,4-D and 2,4,5-trichlorophenoxyacetic acid were the most effective, with use of the latter inducing the production of embryogenic tissues in 7 cultivars which responded poorly or not at all to 2,4-D. Procedures for secondary/cyclic embryogenesis, formation of mature embryos and their conversion to plants are also described.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1432-203X
    Keywords: Key words Sweet potato ; Cryopreservation ; Somatic embryogenesis ; Encapsulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Embryogenic tissue of nine sweet potato [Ipomoea batatas (L.) Lam] genotypes from Asia, Africa and the Americas was established from in vitro axillary buds on Murashige and Skoog medium supplemented with 2,4-dichlorophenoxyacetic acid or 2,4,5-trichlorophenoxyacetic acid. Embryogenic aggregates, 1.0–2.0 mm in diameter, were encapsulated in alginate gel, precultured on medium containing elevated levels of sucrose and dehydrated prior to rapid freezing in liquid nitrogen. The maximum survival of embryogenic tissue ranged from 4% to 38%, depending on the genotype. With the incorporation of a slow-cooling step, survival was generally much higher than that obtained after rapid freezing alone. Five of eight genotypes tested with this protocol gave survival percentages in excess of 55%, and a further two in excess of 33%, all after evaporative dehydration. The most effective sucrose treatment(s), however, varied with the genotype.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Environmental management 16 (1992), S. 541-562 
    ISSN: 1432-1009
    Keywords: Acid rain ; Asia ; Ecosystem impacts ; Emission scenarios ; Acidification vulnerability ; Control options
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Acid rain has been an issue of great concern in North America and Europe during the past several decades. However, due to the passage of a number of recent regulations, most notably the Clean Air Act in the United States in 1990, there is an emerging perception that the problem in these Western nations is nearing solution. The situation in the developing world, particularly in Asia, is much bleaker. Given the policies of many Asian nations to achieve levels of development comparable with the industrialized world—which necessitate a significant expansion of energy consumption (most derived from indigenous coal reserves)—the potential for the formation of, and damage from, acid deposition in these developing countries is very high. This article delineates and assesses the emissions patterns, meteorology, physical geology, and biological and cultural resources present in various Asian nations. Based on this analysis and the risk factors to acidification, it is concluded that a number of areas in Asia are currently vulnerable to acid rain. These regions include Japan, North and South Korea, southern China, and the mountainous portions of Southeast Asia and southwestern India. Furthermore, with accelerated development (and its attendant increase in energy use and production of emissions of acid deposition precursors) in many nations of Asia, it is likely that other regions will also be affected by acidification in the near future. Based on the results of this overview, it is clear that acid deposition has significant potential to impact the Asian region. However, empirical evidence is urgently needed to confirm this and to provide early warning of increases in the magnitude and spread of acid deposition and its effects throughout this part of the world.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...