Feedback relationships

P and Pg, exist in foUicular fluid. Control of inhibin secretion involves a feedback relationship in which circulating FSH stimulates inhibin secretion, which in turn reduces the secretion of FSH (8). Both the homo- and the heterodimers of the P-subunits of inhibin promote the secretion of FSH and thus have been termed activins. Activin is secreted by the ovary and the testes into the circulation. In addition, both inhibin and activin have intragonadal autocrine and paracrine effects that influence gonadal steroidogenesis (9). 

Feedback Relationship Between Ethylene and Other Plant Hormones If ethylene production in ripening fruit is an index of aging and senescence, then its suppression should result in retardation, or antagonism to ripening, aging, and senescence. 

Figure 5. Hypothetical scheme of linkages and feedback relationships between category 1 and category 2 plant hormones related to their overall influences on growth, development, maturation, and senescence...

Afterward, the mathematical model with causal feedback relationships is con-stmcted based on the proposed green transportation strategy (Fig. 26.4). The variables are identified and relevant equations are established based on the feedbacks and cause-and-effect loops. Next, we introduce sub-model of the green transportation policy. 

Interactive Feedback Relationships Among Lead Research, Risk Assessment, and Regulation... 

This abrupt turnabout from erratic, fragmented, and problematic lead exposure and toxicity information to a systematic growth in the multiple and related databases noted above appears to spring from the recent evolution of interactive, positive feedback relationships among the areas of lead science, risk analysis, and lead regulation. These interactive relationships are positive feedback in mechanistic form in that they uniformly prompt more activity. An early depiction of an aspect of this interactive cycle was discussed by Mushak (1991) and later in a report on lead exposures in sensitive populations by the NAS/NRC (1993). 

INTERACTIVE, FEEDBACK RELATIONSHIP OF LEAD SCIENCE AND HUMAN HEALTH RISK ASSESSMENT FOR LEAD... 

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