Transgenic insecticidal Bt crops are being increasingly used worldwide, and concern is increasing about resistance and their effects on nontarget organisms. The toxin acts as a weak pesticide and, hence, the effects are subtler than those of chemical biocides. However, the toxin is ever present, but concentrations vary with age of plant and plant subunit, causing varying lethal and sublethal effects on pest survival, developmental time, and fecundity. Refuges for susceptibility to Bt occur spatially in non-Bt hosts and temporally within (...) the crop because of time-varying toxicity and pest tolerance. Natural enemies feeding on Bt-intoxicated prey may have reduced longevity and, likely, fecundity that reduces their efficacy in controlling pest populations, and pest resurgence and secondary pest outbreaks may occur that may require insecticide use. System modeling is proposed as an efficient tool for examining the use of extant and future biotechnologies in pest control. (shrink)

Ushenko presented his philosophy of logic in vehement opposition to "the postulationist theory." In the endeavor to amputate logic from philosophy and absorb it within mathematics, the postulationists viewed logic as an isolated object-logic to be discussed in meta-logic and construed its symbolic formulas as a game played according to arbitrarily established rules. The objections Ushenko raised are no longer novel, but twenty years ago the entire controversy was new. Above all, he stressed the numerous difficulties entangling the (...) meta-logic. He scored the menace of an infinite regress of meta-logics, and insisted that the consequences of Gödel's work necessarily frustrate the initial great expectations of the postulationists. No purely formal system can be internally proved to be self-consistent and certainly no formal language can ever become as comprehensive as English, though the price of such comprehensiveness is the inevitable occurrence of contradictory sentences. Moreover, he argued that, despite the postulationists' pretense that rules like the principle of non-contradiction were mere conventions for playing the game of logic, these rules proved ubiquitous by trespassing from the object-logic and intruding into the ultimate reaches of the meta-logic. (shrink)

Ushenko's speculative vision opened on the problem of time and its relation to logic. Profoundly concerned about the theme of time--the theme that intrinsically defines romantic irrationalism--he yet endeavored to vindicate within the bounds of temporality the sovereignty of logic so essential to the continuance of classical philosophy. The dual preoccupation with time and logic urged him into the fields of symbolic logic and relativity physics. From the flux of unrepeatable events he disengaged the laws of logic and the (...) propositions of scientific discourse, while at the same time he sought to keep both orders of entity united without injury to either. He ventured into nature as disclosed by contemporary physics and selected the category of event to supplant substance. He undertook to expound a metaphysics of events, grappled with the problem of the unity not only of nature but of the singular events that make up nature, and fixed upon the overarching structure of the space-time of relativity physics to resolve the problem. But this did not suffice. The metaphysical vision at work in these early books glimpsed at moments a principle beyond time, beyond propositions, beyond events--the principle of power. Power and Events: An Essay on Dynamics in Philosophy focused on the principle of power, integrating the other themes in terms of it. As the mature work of a significant and original thinker, Power and Events posed the principle of power as the central idea for the future course of philosophical investigation. In pursuit of its implications Ushenko embarked upon the philosophy of art in his last book Dynamics of Art and in a consistent yet startling fashion advanced the thesis that the substance of art is in effect a dynamic equilibrium of powers. (shrink)

In light of the recently developed European Union Biofuels Strategy, the literature is reviewed to examine the coherency of biofuel production with the EU nonindustrial vision of agriculture, and given its insufficient land base, the implications of a proposed bioenergy pact to grow biofuel crops in the developing world to meet EU biofuel demands. The EU acknowledged that the use of food crops for biofuel production was based on wrong assumptions concerning climate change mitigation, and its support has now shifted (...) to second-generation nonfood crops. The bioenergy pact entails biofuel crops production in developing countries, especially Africa, that in the absence of environmental and social regulations may lead to ethical trade-offs in land use and the use of transgenic technology that conflicts with the EU’s own vision of sustainable agriculture. (shrink)

Background In February, 2015, the Supreme Court of Canada struck down the ban on medical assistance in dying. In June, 2016, the federal government passed Bill C-14, permitting MAiD. Current medical students will be the first physician cohort to enter a system permissive of MAiD, and may help to ensure equitable access to care. This study assessed medical student views on MAiD, factors influencing these views, and opportunities for medical education. Methods An exploratory cross-sectional survey was developed and distributed to (...) medical students across all years of a three-year Canadian undergraduate medical program. The investigators administered the survey to participants during academic sessions from November to December, 2015. Analysis of the results included summary descriptive statistics, Pearson’s chi-square test of independence to identify differences between participants by year of study, logistic regression to identify factors that influence students’ stances on MAiD, and Wilcoxon signed rank test to measure changes in student support for MAiD and comfort discussing MAiD. Results There were 405 participants for a response rate of 87%. The majority of students supported the Supreme Court’s decision, 61% would provide the means for a patient to end their life, and 38% would personally administer a lethal medication. Students who were more willing to provide the means for MAiD found medical education/clinical experience and patient autonomy to be important contributors to their stances on MAiD. Those students who were less willing to provide the means for MAiD found religious/spiritual beliefs and teachings, as well as concern about potential negative consequences, to be important contributors to their stances on MAiD. Educational training desired by participants included medicolegal, communication skills, technical skills, and religious. Conclusions Medical students generally supported and would provide the means for MAiD to patients. They also indicated a desire for directed medical education on MAiD. (shrink)

The use of marginal land for lignocellulosic biofuel production is examined for system stability, resilience, and eco-social sustainability. A North American prairie grass system and its industrialization for maximum biomass production using biotechnology and agro-technical inputs is the focus of the analysis. Demographic models of ML biomass production and ethanol farmer/producers are used to examine the stability properties of the ML system. A bio-economic model that maximizes the utility of consumption having the dynamics of MLs and the farmer/producers as dynamic (...) constraints is used to examine the effects of increased conversion efficiency, input costs, risk, and levels of base resources and inputs on the competitive and societal solutions for biomass production. We posit ML abandonment after biofuel production ceases could lead to permanent land degradation below initial levels that prohibit the establishment of the original flora and fauna. (shrink)

I have admitted different kinds of power but the admission does not make it objectionable--in spite of Dr. Beardsley's point and Mr. Grünbaum's opening statement--to use the same word in order to indicate that all these kinds are under the same category--Mr. Williams' rejection of the category notwithstanding--of latent but directed tendencies or dispositions. Let my critics envisage power by analogy with, and including, the physical vector of force. i.e. as something which we represent by an arrow, to induce them (...) to reconsider Dr. Beardsley's point and to concede that the Gestalt forces of cohesion and personal dispositions belong to the category under consideration since both are directed agencies. The directedness of power--let me add with reference to Mr. Feigl's point and to one of Mr. Krikorian's questions --enables me to account for the so-called teleological situations without assuming a metaphysics of teleology. In particular, I can mention a "feed-back" mechanism in order to give an example of the transformation of directed into directing, or controlling, power. (shrink)

This comment piece examines the distinction between negation of a statement and denial of its truth, in the context of an early examination of Quine's related views. Where P is "Jones is ill," the author maintains, in contrast to Quine, that the negation of P is "Jones is ill" is false.

The premise of functional meaning is to the effect that the appropriate use of words--the employment of words in accordance with the standard usage--discloses their meaning. In its extreme or radical version the premise is a downright identification of a meaning with an act, or acts, of using words, i.e., with actual occurrences. Since actual occurrences are particulars, this extreme form would appeal to a nominalist who wants to eschew universals, especially in a concern with meaning. But the radical premise (...) is incompatible with the second premise of a dispositional semantics. For the second premise is intended to do justice to the fact that the same word may take care of endless variations of its meaning or, at any rate, of a number which is not limited to particular variations that occur with the act, or acts, of using the word. Accordingly, a dispositional semantics requires a moderate version of the premise of functional meaning. (shrink)