Effects of salinity on the growth rate, morphology and water content of some Brazilian red algae of economic importance

The growth rate, morphology and water content of six species of Brazilian red algae of economic importance were studied under various salinities. The study comprises three agarophytic (Gracilaria aff. venucosa, Gracilaria sp. and Pterocladia capillacea), and three carrageenophytic algae (Meristiella echinocarpa, Hypnea cornuta and H. musciformis), subjected to salinities from 5 to 60‰. Al species tolerated, for the period and conditions described, a much broader range of salinities than they usually face in their habitats. All species were more tolerant to salinities above 30‰ than below this value, with maximum growth occurring between 25-40‰. Water content at the end of the experiments varied with the species, with an inverse relation in salinities above 40‰. Highest salinity values reduced branching, and lowest salinities lead to thalli bleaching. The results offer guidelines for the selection of potential areas with more adequate salinity regimes for the cultivation of the species studied

Optimization of culture conditions for tissue culture production of young plantlets of carrageenophyte Kappaphycus

To improve the production of Kappaphycus plantlets in tissue culture, optimum media concentrations of an Ascophyllum nodosum extract (Acadian Marine Plant Extract Powder, AMPEP), plant growth regulators (PGR), pH–temperature combinations, and explant density were determined. Kappaphycus alvarezii var. tambalang purple (PUR), kapilaran brown (KAP), vanguard brown (VAN), adik-adik (AA), tungawan green (TGR), and K. striatum var. sacol green (GS) were used as explants. Based on the shortest period for shoot emergence and the economical use of AMPEP, the optimum enriched media was 3.0 mg L−1 AMPEP and 0.1 mg L−1 AMPEP + PGR 1 mg L−1 each phenylacetic acid (PAA) and zeatin for PUR, 1.0 mg L−1 AMPEP + PGR for KAP and GS, 0.1 mg L−1 AMPEP + PGR for VAN, and 3.0 mg L−1 AMPEP and 0.001 mg L−1 AMPEP + PGR for AA and TGR. Results showed that the addition of PGR to low concentrations of AMPEP hastened shoot formation. pH–temperature combinations for the most rapid shoot formation were determined for the brown (KAP) and purple (PUR) color morphotypes of K. alvarezii var. tambalang and the green morphotype of K. striatum var. sacol (GS) cultured in 1.0 mg L−1 AMPEP + PGR. The brown morphotype produced the most number of shoots at pH 7.7 at 20°C after as little as 20 days. Purple K. alvarezii showed an increased shoot formation at pH 6.7 at 25°C and the green K. striatum morphotype at pH 8.7 at 25°C. The optimum number of explants added to the culture media was also determined for tungawan green (TGR), brown (KAP), and tambalang purple (PUR) varieties of K. alvarezii in 1.0 mg L−1 AMPEP + PGR. The number of explants and the volume of the culture media combination were also tested. The highest average number of shoots formed occurred in two explants:1 mL culture media (2:1) for KAP and PUR (35.00% and 16.67%, respectively) and 1 explant: 2 mL culture media for the TGR (100.00%) with a range of 0.5–3.0 mm shoot length after 40 days in culture. The earliest shoot formation was observed after 21 days for the brown and 9 days for both the green and purple color morphotypes of Kappaphycus, in all densities investigated. This indicated that within the range tested, the density of explants did not have a significant effect on the rate of shoot formation but did influence the average number generated from the culture. The rate of production of new and improved Kappaphycus explants for a commercial nursery stock was improved through the use of AMPEP with optimized culture media pH, temperature, and density conditions

Wilfred Burchett and the UN command's media relations during the Korean War, 1951-52

Wilfred A. Burchett was perhaps the most controversial foreign correspondent of the Cold War era. An Australian by birth, he wrote for British and French newspapers, but spent much of his career reporting from the other side of the "bamboo curtain." Although his dispatches often had a propagandist purpose, his account of the U.S. Army's media relations during the protracted Korean armistice negotiations continues to exert a significant influence over the academic literature. This article looks at the reasons for this influence and critically examines Burchett's claim that the U.S. military engaged in a concerted effort to mislead the public by lying about, and sometimes suppressing, what was really happening in the truce talk