By Harold Zeliger
In this crucial reference paintings, Zeliger catalogs the identified results of chemical mixtures
on the human physique and in addition proposes a framework for realizing and predicting their
actions when it comes to lipophile (fat soluble) / hydrophile (water soluble) interactions. The
author’s concentration is on health problems that take place following exposures to combos of chemicals
that can't be attributed to anyone component to the mixture.
In the 1st half the mechanisms of chemical absorption at a molecular and
macromolecular point are defined, in addition to the body’s tools of protecting itself
against xenobiotic intrusion. half II examines the assets of the chemical compounds discusssed,
looking at air and water pollutants, nutrition ingredients, prescription drugs, and so forth. half III, which
includes a number of case reports, examines particular results of specific combos on
particular physique structures and organs and offers a theoretical framework for predicting
what the results of uncharacterized combos may be. half IV covers regulatory
requirements and the necessity to modify urged publicity degrees for products
containing combinations. It additionally comprises tips on find out how to restrict publicity to
mixtures within the items we use and on easy methods to restrict free up of combinations into the
Providing short summaries of every mix and its results, Zeliger presents a
comprehensive reference, a leaping off aspect for pros (with vast chapter
bibliographies) and an creation to the subject for these learning conventional toxicology.
Addressing many inadequately understood health problems and prerequisites corresponding to asthma,
infertility and melanoma, it's going to even be of curiosity to future health pros, environmental
scientists and lawyers.
- Presents a theoretical framework for predicting the results of chemical combinations for which no particular info exists (this predictive point is critical as a result of big variety of diverse capability chemical mixtures - some distance too many to comprehensively catalog)
- A fast and handy resource of tough to return by way of information at the speedily constructing box of chemical combinations, for teams together with chemists and engineers, toxicologists, future health pros and environmental scientists
- New and up-to-date fabric contains over 30% of this well timed re-creation, such as the newest examine facts along an multiplied advent to the technological know-how and artwork of predicting the toxicological homes of chemical mixtures
Read Online or Download Human Toxicology of Chemical Mixtures PDF
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Extra info for Human Toxicology of Chemical Mixtures
It is an established lung carcinogen, but it is BaP’s diol-epoxide metabolite that is the actual tumerogen. The path from absorption to tumor production is a five-step process involving two transport steps. The five steps, which are depicted in Fig. 1 are: 1. BaP (I) is absorbed in the lung. 2. BaP is transported to the liver. 3. In the liver, BaP is metabolized to a diol-epoxide (DE) derivative (II). 4. The metabolite is transported back to the lung. 5. DE acts in the lung as the ultimate tumerogen.
Additive effects are observed when mixtures consist of species that are similar, that is, act identically on a target organ. Additive effects may be observed, for example, when a mixture of two compounds, each below the no observed effect level (NOEL) produce a predicted toxic effect when the sum of their concentrations is greater than the threshold level for toxic action. Examples of chemical mixtures that produce additive effects are 1. n-hexane and methyl-n-butyl ketone (peripheral neuropathy); 2.
3 In vivo conversion of SO to radical species. 4 Conversion of SO to hydrogen peroxide. 5 The Fenton reaction. Conversion of hydrogen peroxide to hydroxyl radical. indd 35 5/16/2008 1:08:00 PM 36 INTRODUCTION TO CHEMICAL TOXICOLOGY OF MIXTURES ROS formation is induced by absorption of many xenobiotics, including haloalkanes, peroxides, benzenoid hydrocarbons, PAHs, phenols, aromatic nitro compounds, aromatic amines, alkylating agents (including epoxides and nitrogen mustards), alkenes (including vinyl chloride, acrylonitrile, styrene, and 1,3-butadiene), hydrazines, N-nitroso compounds, a variety of pesticides, abused drugs, and heavy metals (including Cr, Ni, Pb, and Cd).