Polyphenols and fatty acids responsible for anti-cyanobacterial allelopathic effects of submerged macrophyte Myriophyllum spicatum

Myriophyllum spicatum is known to inhibit the growth of cyanobacteria such as Microcystis aeruginosa by releasing anti-cyanobacterial allelochemicals. The allelochemicals possibly responsible for the inhibition include five polyphenols and three fatty acids, but the extent to which these are indeed responsible for the anti-cyanobacterial effects is unclear. The goal of this research was to determine the contribution of these compounds to the allelopathic effect of M. spicatum on M. aeruginosa. We first collected information on the release rates of these compounds and then added the compounds to a cyanobacterial medium on the basis of their release rates so as to simulate their excretion by M. spicatum. Addition of the polyphenols and fatty acids inhibited the growth of M. aeruginosa, and the interaction of the polyphenols and fatty acids was additive. The EC50 of a polyphenol and fatty acid mixture was compared with that of M. spicatum itself as previously determined in a mixed culture system in which M. spicatum and M. aeruginosa were incubated. The former was about 1.9 times higher than that of the latter, the implication being that the inhibitory effect of the polyphenols and fatty acids contributed about 53% of the allelopathic effect of M. spicatum. This paper is the first to describe allelochemicals that account for a half of the anti-cyanobacterial allelopathic effect of a macrophyte.     

The economics of dying: A misapplication of tools

Conclusions Unlike McKenzie and Tullock, we do not know how personsshould treat their bodily organs or what is an ideal exit. That depends upon their utility goals, which are defined in output terms specific to the decision maker. We contend that the body is an input into the utility production process, and therefore, as with any input, it must be maintained and repaired at a level consistent with the output goals for maximization of utility. Thus, from this framework, it is quite consistent for a person to die with healthy organs without any thought of belief in reincarnation or the desire to bequeath one's bodily organs to others, or religious values. Self interest is all that must prevail.Also, the fact that there are interrelationships between the organs in the system, and at points these relationships take on fixed factor characteristics such that reduced levels of operation in one organ can create disorientation or coma or damage to other organs, means that the body cannot die as M-T suggest. Zero capacity for all organs at death is a technical impossibility as well as being inconsistent with the output goals of utility maximizers.     

The Indonesian national family planning program

With a change in the Indonesian government in 1965 there came a change in government policy from pronatalist to limiting the birthrate. In January 1970 the government National Family Planning Cordinating Body was established. During the initial phase of the program family planning efforts have been limited to the islands of Java and Bali where family planning services are integrated into health service clinics. By the beginning of 1975 there were some 2400 clinics on Java and Bali. Family planning acceptors increased from 53,100 in 1969 to 1.5 million in 1974. The 1st phase of the program aimed at consolidating government support, winning local formal and informal leader support, introducing services into public clinic health systems, and building a viable administrative organization. The 2nd phase of the program has quantified the goal of the program, shifted from an emphasis on new acceptors to continuing users, broadened the participation of various government and nongovernmental groups, expanded the program into the private sector, and initiated a research and development program to stimulate local problem identification and resolution. By mid-1975 over 4.7 million women, or 34% of the married women between the ages of 15 and 44, had been recruited into the program. The East Java program has consistently been the most cost effective in terms of recruiting new acceptors. In terms of cost per couple year of protection, the trend has been steadily downward over the 3 years of study in the provinces of Jakarta, West Java, Central Java, Yogyakarta, East Java, and Bali where there are programs. The program needs to develop new approaches for those individuals who are not yet acceptors. Additionally, the program must concentrate on user continuation.