Background and objective: Compost is beneficial for conditioning the structure and nutrient content of soil. Toxic metals are the most important contaminants that can enter the food chain through the compost products and affect human health. The aim of this study was to assess the arsenic, mercury, cadmium, and lead levels in six brands of vermicompost produced from the organic solid wastes in ...

Modern biotechnology can help global coalition against hunger and malnutrition. Global area under the production of transgenic plants has reached 134 million hectares at the end of the year 2009 and is expected to reach nearly 150 million hectares by the year 2010. In spite of the benefits that modern biotechnology offers, concerns have been raised in the proper and environmentally sound and sa...

learning a second or foreign language requires the manipulation of four main skills, namely, listening, reading, speaking, and writing which lead to effective communication. it is obvious that vocabulary is an indispensible part of any communication, so without a vocabulary, no meaningful communication can take place and meaningful communication relies heavily on vocabulary. one fundamental fac...

abstract sensitive and precise voltammetric methods for the determination of trace amounts of furaldehydes, mainly as furfural (f) and 5-hydroxymethyl-2-furaldehyde (hmf), in waste waters and other matrices is described. determination of total furaldehyde at < ?g g-1 levels in alkaline buffered aqueous media was individually investigated. by the use of ordinary swv and adsorptive square wave ...

abstract the main purpose of this study was to investigate whether there was any significant difference between the speaking achievement of learners who were trained by means of consciousness raising of sociolinguistic skills and that of learners who were trained without the above mentioned task. the participants of this study consist of 60 intermediate level students participating languag...

Background: Formaldehyde used in the pathology and histology laboratories as a tissue fixation. Formaldehyde classified in group A1 (human carcinogen) by the International Agency for Research on Cancer (IARC). The aim of this study was the evaluation of relationship between ambient concentrations and time-weighted average or ceiling exposures of formaldehyde the pathology departments. Methods:...

The aim of the present study was to identify the effective dimensions of national chess development in Iran. The research method was exploratory and the required information was obtained through documentary studies and interviews with experts. The statistical population consisted of university professors specializing in country chess in different ranks and national and international levels. The...