Digital library

  • Results obtained on seasonal growth, yield and physical properties of agar in Gelidiella acerosa and Gracilaria edulis for a period of one year are presented. Vegetation of these two species occurred throughout the year with two peak growth periods.

    Author(s): Chennubhotla, V S Krishnamurthy, Kalimuthu, S , Najmuddin, M , Panigrahy, R, Selvaraj, M
  • Results obtained on the changes in growth, reproduction, alginic acid and mannitol contents of Turbinoria decurrens carried out for one year from March, 1973 to February, 1974 are presented. Young plants of T. decurrens appear in May and grow to a minimum size between December and February. Branching starts from August and maximum number of branched plants occur in November. Reproductive plants were observed throughout the year. The yield of alginic acid varies from 16.3 to 26.3 % and the estimated mannitol content from 1.5 to 8.7 %. T. decurrens may be harvested in the months between December and February for extraction of alginic acid.

    Author(s): Kaliaperumal, N, Kalimuthu, S
  • Considerable work has been done on the chemical aspects of Indian seaweeds during the last three decades, of which those up to 1970 have been reviewed by Umamaheswara Rao (1970). In this chapter the information so far collected on the mineral constituents, carbohydrates and other chemicals is presented.

    Author(s): Kaliaperumal, N, Chennubhotla, V S Krishnamurthy, Kalimuthu, S, Ramalingam, J R, Selvaraj, M, Najmuddin, M
  • There is practically no reference which gives a complete account of the mineral constituents of the commercial seaweeds and their relationship with the organic constituents or on the- ionic exchanges taking place between the algae and the surrounding water. The early attempts to utilize seaweeds for the manufacture of potash and iodine provide some data on the amounts of these elements and their seasonal variations in particular species. Work on British seaweeds has shown (Chapman, 1950) that the changes in the iodine content are nearly directly proportional to the potash and that the amount of these nutrients in the living plant varies from month to month.

    Author(s): Pillai, S Krishna
  • Several interesting studies have been made in the past on the nitrogen metabolism in seaweeds. Haas and Hi11 (1931) and Haas, Hill and Karstens (1935) isolated water-soluble peptides from the brown alga Pelvetia canaliculata and explained their presence as due to lack of metabolic balance traceable to either desiccation or low illumination. To obtain further evidence Haas, Hill and Russel-Wells (1938) examined the calcareous algae Corallina squamata Ellis, Lithophylum incrustans Foslie, Amphiora capensis Aresch and Galaxaura subverticillata Kjell. A number of unencrusted algae were also examined, but so far among the latter group peptides were found only in the two species, Pelvetia canaliculata and Griffithsia flocculoses. It was found that the encrusted forms contained crude peptides to the extent of 0.05 to 0.29% of the dry weight.

    Author(s): Pillai, V Krishna
  • Seaweeds in general derive their importance from their carbohydrate content. Part of the carbohydrate is in the form of cellulose which cannot be hydrolysed by ordinary means; and the rest in the form of polysaccharides either as agar or as algin, the latter being considered as a polymerised form of d-mannuronic acid. Kylin (1913) is of the opinion that simple reducing sugars constitute the first products of photosynthesis and that they occur in very small quantities.

    Author(s): Pillai, V Krishna
  • PDF on final report of 'Preliminary Study - Chinese Market for Seaweed and Carrageenan Industry'.

    Author(s): The JLJ Group - Solutions for China Entry & Growth
  • A PDF Power Point on "Climate: the case for marine bioenergy in Europe and The Crown Estate's response in the UK".

    Author(s): Mike Cowling, Alex Adrian
  • Greenhouse gas levels are on track to exceed the worst-case scenario. But, as world leaders meet in Paris for the UN climate summit this month, Tim Flannery argues that there are still realistic grounds for hope

  • The commercial exploitation of seaweeds in India has started in 1966. At present the seaweeds are exploited in Gujarat coast and many localities in Tamil Nadu.

    Author(s): Silas, E G, Kalimuthu, S