in the present study, the tangrah region located in the vicinity of golestannational park was selected for exploring the changes in the amount of the secondaryessential of hypericin in hypericum perforatum in different highlands of the easterngolestan province. the aerial flowered parts of the herb were collected randomly and inthree replications from four altitudes of 300 m, 600 m, 900 m, and ...

Despite the fact that national parks and other protected areas are mostly adopting the sustainable development process, it was found that sustainability has yet to be perceived pragmatically in these areas. Due to its process, this paper presents a monitoring framework approach to develop and implement indicators for sustainable tourism. To illustrate the application of the framework, a set of ...

despite the fact that national parks and other protected areas are mostly adopting the sustainable development process, it was found that sustainability has yet to be perceived pragmatically in these areas. due to its process, this paper presents a monitoring framework approach to develop and implement indicators for sustainable tourism. to illustrate the application of the framework, a set of ...

We show that instantaneous increases in real NNP over time are an accurate indicator of true dynamic welfare improvements. The framework of the paper is the standard multisector optimal growth model. The result highlights a connection between the theory of green (or comprehensive) national income accounting and the theory of real price indices.

nowadays, the machinery dependent life makes the people take refuge in natural recreational places. therefore, evaluating the recreational value of natural promenades has great importance to lead to more protection. in this research, economic valuation of sorkheh hesar national park, and protected area of geno were computed, and socio-economic factors compared in each area. geno protected area ...

BACKGROUND AND AIMS It has been suggested that distributing naloxone to people who inject drugs (PWID) will lead to fewer attendances by emergency medical services at opioid-related overdose incidents if peer administration of naloxone was perceived to have resuscitated the overdose victim successfully. This study evaluated the impact of a national naloxone programme (NNP) on ambulance attendan...

fragmentation, or breaking apart of habitats, is one of the major causes of decline in biological diversity. mature ecosystems, especially dense forests are very sensitive to this phenomenon and roads are one of the major causes of fragmentation in forest landscapes. present investigation aims to trace landscape fragmentation in dense forests of golestan national park in northeast of iran betw...

The present experiments were performed in order to analyze the mechanism by which thymus-independent antigens (nonspecific B-cell mitogens) can induce specific immune responses to antigenic determinants present on the same molecule. The hapten NNP was coupled to the B-cell mitogen, lipopolysaccharide (LPS). The conjugate retained full mitogenic activity and bound specifically to NNP-reactive ce...