Lead (Pb) contamination of the environment is an important human health problem. Children are vulnerable to Pb toxicity; it causes damage to the central nervous system and, in some extreme cases, can cause death. Lead is widespread, especially in the urban environment, and is present in the atmosphere, soil, water and food. Pb tends to accumulate in surface soil because of its low solubility, mobility, and relative freedom from microbial degradation of this element in the soil. Lead is present in (...) soil as a result to weathering and other pedogenic processes acting on the soil parent material; or from pollution arising caused by the anthropogenic activities; such as mining, smelting and waste disposal; or through the adoption of the unsafe and unethical agricultural practices such as using of sewage sludge, and waste water in production of vegetable crops or cultivation of vegetables near highways and industry regions. Lead concentrations are generally higher in the leafy vegetables than the other vegetables. Factors affecting lead uptake included its concentration in the soil, soil pH, soil type, organic matter content, plant species, and unsafe agriculture practices. Generally, as Pb concentration increased; dry matter yields of roots, stems and leaves as well as total yield decreased. The mechanism of growth inhibition by lead involve: a decrease in number of dividing cells, a reduction on chlorophyll synthesis, induced water stress to plants, and decreased NO 3 - uptake, reduced nitrate and nitrite reductase activity, a direct effect of lead on protein synthesis, a decrease on the uptake and concentration of nutrients in plants. The strategies to minimize Pb hazard can be represented in: (a) Phytoremediation, through natural plants are able to bio-accumulate Pb in their above–ground parts, which are then harvested for removal such as, using Indian Mustard (Brassica juncea), Ragweed (Ambrosia artemisiifolia), Hemp Dogbane (Apocynum cannabium), or Poplar trees, which sequester lead in its biomass. (b) Good and ethical agricultural practices such as cultivation of vegetables crops as far from busy streets or highways and industry regions as well as nonuse of sewage sludge and waste water in cultivated soils. (c) Increasing the absorptive capacity of the soil by adding organic matter and humic acid. (d) Growing vegetable crops and cultivars with a low potential to accumulate lead, especially in soils exposed to atmospheric pollution. (e) Washing of leafy vegetables by water containing 1 % vinegar or peeling roots, tubers, and some fruits of vegetables before consumption may be an important factor in reducing the lead concentration. (shrink)

The regional principle of socioeconomic and political development has always served as the basis of the existence of developed states. The rights of regions have been severely curtailed only in countries with a totalitarian system of government.

The interaction between philosophy and political parties is one of the most lively questions in the discipline of the history of philosophy and in the battle of ideas today. It affects both specialists in philosophy and representatives of other professions, particularly in the broad realm of creative intellectuals. It excites people of different generations living under different social systems and belonging to different and often opposed classes.

The problem considered in the article that follows has a long and complicated history. The many different solutions proposed reflect the process of development, deepening, and broadening of knowledge as a whole. They correspond to particular levels of knowledge, determining the character of thought both of the times and of particular individuals. Specifically, it is the understanding of the essence of contradiction that governs the entire theoretical exposition that follows, its substance and approximation to truth. Here we shall consider for (...) analysis only one aspect of this fundamental theme — dialectical contradiction in the evolution of knowledge. Thus, for the most part the discussion will be of the laws of thought; only when necessary will we turn to analysis of contradictions in the objective world. It is quite understandable that the process of thought should occur according to the same, more general laws that are operative in the objective world; nevertheless, the manifestation of these laws has its own special features. Therefore, the questions posed by philosophers of antiquity concerning the degree to which reality itself corresponds to the understanding thereof in terms of the exactness, comprehensiveness, and depth of reflection of the objective world by a subject have not lost their timeliness. Such questions include those associated with the phenomenon of contradiction. For example, is contradiction in thought adequate to the contradictions among things ? How does contradiction in thought take shape, and what are its forms and structures? Is the relationship between opposites always a contradiction? Is it possible to solve antinomies, and so forth? An extensive literature has been published on these subjects. There is hardly a philosopher who can avoid them and not express his attitude toward them. As it is impossible, within the confines of an article, to adduce a full list of published works on contradictions, the authors, with an eye to what has been achieved in this sphere, also regard it as undesirable to analyze the diversity of points of view, and will confine themselves to presenting their own understanding of the problem under consideration. (shrink)

Good and evil; religious aspects; Islam.

Donald Davidson has made enormous contributions to the philosophy of action, epistemology, semantics and philosophy of mind and today is recognized as one of the most important analytical philosophers of the late twentieth century. _Donald Davidson: Truth, Meaning and Knowledge_ addresses * Davidson's writings on epistemology and theory of language with their implications of ontology and philosophy of mind * the central issue of whether truth is the ultimate goal of enquiry, challenged by contributions from Richard Rorty and Paul Horwich (...) * Davidson's approach to semantics and applied linguistics as addressed by Kirk Ludwig, Gabriel Segal, Peter Pagin, Stephen Neale, Herman Cappelen and Ernie Lepore and Reinaldo Elugardo * Davidson's advances in the philosophy of mind in relation to the views of Williard V. Quine, John McDowell and Peter F. Strawson, in essays by Roger Gibson and Anita Avramides. (shrink)

Stem cells are likely to be used as an alternate source of biological material for neural transplantation to treat Parkinson’s disease in the not too distant future. Among the several ethical criteria that must be fulfilled before proceeding with clinical research, a favourable benefit to risk ratio must be obtained. The potential benefits to the participant and to society are evaluated relative to the risks in an attempt to offer the participants a reasonable choice. Through examination of preclinical studies transplanting (...) stem cells in animals and the transplantation of fetal tissue in patients with Parkinson’s disease, a current set of potential benefits and risks for neural transplantation of stem cells in clinical research of Parkinson’s disease are derived. The potential benefits to research participants undergoing stem cell transplantation are relief of parkinsonian symptoms and decreasing doses of parkinsonian drugs. Transplantation of stem cells as a treatment for Parkinson’s disease may benefit society by providing knowledge that can be used to help determine better treatments in the future. The risks to research participants undergoing stem cell transplantation include tumour formation, inappropriate stem cell migration, immune rejection of transplanted stem cells, haemorrhage during neurosurgery and postoperative infection. Although some of these risks are general to neurosurgical transplantation and may not be reduced for participants, the potential risk of tumour formation and inappropriate stem cell migration must be minimised before obtaining a favourable potential benefit to risk calculus and to provide participants with a reasonable choice before they enrol in clinical studies. (shrink)

This paper is going to re-read Imam Mohammad al-Ghazali’s moral ideas in order to find the responses to the questions of moral psychology. Al-Ghazali, following the Greek and Islamic philosophers, relates each virtue or vice to a particular faculty in man’s soul. Moreover, following the Asharites, he considers the basis of moral good and badness to be religious. Furthermore, having mentioned al-Ghazali and Hume’s opinions as well as their similarities, this writing explains why al-Ghazali’s view on the moral motivation has (...) not encountered Hume’s objections. And finally, it presents the differences between al-Ghazali and the Greek philosophers’ views on virtues and vices as well as evaluates al-Ghazali’s psychological opinions in ethics. (shrink)