Stimulation of Growth of Peppermint (Mentha piperita) by Phosfon, a Growth Retardant

Abstract

The shoot growth and fresh weight of Mentha piperita grown in soil were stimulated at concentrations of 1.

Effect of Soluble Sulfide on the Activity of Luminescent Bacteria

“…However, the mechanisms underlying hormesis induced by environmental agents are not well elucidated [38]. The current explanation about hormesis was that it is due to an overcompensation in response to a disruption in homeostasis and this was supported through experimentation [39]. The hormetic responses has an initial inhibitory response has has usually been reported, followed by a compensatory response that would happened when the organism was stimulated by external environmental pollutants.…”

Hormesis Responses of Free and Immobilized Light-Emitting Bacteria

“…Chelation or complexation activities may be involved, and Browne and Davis (1977) theorized that hormesis in eukaryotic cells was due to the presence of a mitotic stimulator. Calabrese (1999) provides some evidence that hormesis is due to an overcompensation in response to a disruption in homeostasis and is supported through experimentation (Calabrese and Howe, 1976). This response to a temporal disruption in homeostasis may have an advantage when adapting to low levels of biological stress, as this is su$cient to elicit an overcompensation and, as a result, higher levels are less likely to a!ect the organism after this initial exposure (Stebbing, 1997).…”

Expanding the RfD Concept to Incorporate and Optimize Beneficial Effects While Preventing Toxic Responses from Nonessential Toxicants

“…Nonetheless, regulatory agencies have had to modify stan-cial effect on the general public would either be missed or minimal. However, if the intraspecies UF were 5-fold as has dard RfD derivation procedures to account for essential and/ or beneficial effects of toxic agents by taking into account recently been recommended by Calabrese and Gilbert (1993) based, in part, on the presumed lack of independence of the entire dose-response continuum. For example, the regulation of fluoride in drinking water recognizes beneficial the intra-and interindividual UFs, then the idealized RfD derivation process would be able to approach goals of predental effects at low doses and a variety of adverse effects at higher doses (Calabrese, 1978).…”

“…Such observations have been review of the topic ''adaptive response''). demonstrated for bacteria, phytoplankton (Gordon and Prouse, 1973), algae (Browne and Davis, 1977;Stromgren, 1980) pollen seed germination and more complex plants THE DOSE-RESPONSE CONTINUUM AND (Goldin et al, 1961;Ingram and Fisher, 1973;Williams et THE RfD PROCESS al., 1978;Nechay and Saunders, 1978;Pauwels, 1961;Calabrese and Howe, 1976;Cathey and StuWhile Stebbing (1982) presented several types of doseart, 1961;Cathey, 1964;Knypl, 1967). Similar observations response relationships that are purported to describe the have been reported for fungi (Branham, 1929; Southam and low-dose stimulating response, the most frequently reEhrlich, 1943).…”