The Hindu Vedas place teachers on a high pedestal: “a guru creates and sustains knowledge, and destroys the weeds of ignorance, just like the creator, the sustainer, and the destroyer of this universe”. It is no surprise then that students see teachers as authority figures that teach them the truth. Thus, the teacher has a profound responsibility to guide students by helping them to assimilate ...

conclusions according to the results of the present study, the prevalence of some infections with intestinal parasites is high in the hamadan city. considering that most of the parasites are nonpathogenic, pathogenic ones have been reduced generally in comparison to the previous reports. nevertheless, the existence of taenia species and h. nana could not be ignored. results among 228 samples, 8...

hydatid disease commonly involves liver but in rare cases, it can involve cardiac structures. a 75-yr-old farmer from parsabad-moghan, northwestern iran was presented to the emergency room of tehran imam khomeini hospital, tehran, iran with dyspnea and without chest pain in 2014. a lesion compatible with hydatid cyst was found in echocardiography and confirmed by serology and mri. surgical trea...

Although cheatgrass (Bromus tectorum) has been widely distributed across western rangelands for >70 years, the full ecologic and economic impacts of this non-native invasive plant have not yet occurred. Unfortunately, several independent lines of evidence indicate that the rate at which acreage becomes infested with cheatgrass is increasing rapidly. Furthermore, the invasion and spread of a num...

Objective: Importance of management of gardens weeds is an issue that unfortunately has less been investigated by weeds researchers of country. One of the most important restrictive agents of cultivated surface and producing crops of Citrus orchards are weeds. Methods: To achieve this purpose, a research was performed in plot of Valencia orange trees of citrus fruits of Dezful in 2013. This pro...

Introduction Conservation tillage systems using sweep plows or field cultivators leave a high percentage of crop residues on the soil surface, which protects the soil from wind and water erosion (Johnson, 1950; Jones and Johnson, 1982; Allen and Fenster, 1986; Johnson et al., 1974). These systems have been successful in semiarid areas because meager rainfall after plowing does not allow weeds t...

Herbicides are currently pivotal to control weeds and sustain food security. Herbicides must efficiently kill weeds while being as harmless as possible for crops, even crops taxonomically close to weeds. To increase their selectivity toward crops, some herbicides are sprayed in association with safeners that are bioactive compounds exacerbating herbicide-degrading pathways reputedly specificall...

Many studies of plant competition have been directed towards understanding how plants respond to density in monocultures and how the presence of weeds affects yield in crops. In this Botanical Briefing, the development and current understanding of plant competition is reviewed, with particular emphasis being placed on the theory of plant competition and the development and application of mathem...