abstract the lack of water is the most important problem in extensive landscape especially turfgrass in arid and semi arid regions. the root responses in native and commercial grasses under drought stress were investigated. this experiment was in a factorial experiment based on unbalanced completely random design on the year 2006. the specious that we used in this experiment included (i) commer...

unshaded sites in southern USA when exposed to high summer temperatures (Van Santen and Sleper, 1996). The design of agroforestry systems requires a thorough understandNeither orchardgrass nor tall fescue had significant ing of biological interactions that might complement or constrain yield reduction in pots exposed to 50% shade, and orproduction. The objective of this study was to examine eff...

Previous studies on chewing frequency across animal species have focused on finding a single universal scaling law. Controversy between the different models has been aroused without elucidating the variations in chewing frequency. In the present study we show that vigorous chewing is limited by the maximum force of muscle, so that the upper chewing frequency scales as the -1/3 power of body mas...

We investigated whether change of emotion related to sourness during chewing causes higher brain functions by using mental arithmetic test. Subjects comprised 120 healthy individuals. The mental arithmetic test was performed under four conditions: chewing lemon-flavored gum (Standard gum, as a delicious gum); gum with 6 times the citric acid component of the Standard gum (Strong-sour gum, as an...

............................................................................................................................ iii ACKNOWLEDGMENTS ........................................................................................................ v CHAPTER 1. GENERAL INTRODUCTION ...................................................................... 1 Thesis Organization .......................

Tall fescue is native to Europe and was rarely planted in the United States until after the first four decades of the 20 century. However, since the release of the variety ‘Kentucky 31’ in 1943, this versatile cool season perennial grass has been widely planted for forage, turf, and conservation purposes, with most of the acreage planted consisting of this variety. “Fescue” has many attributes ...

Abstract Fescue toxicosis decreases beef cattle performance in a multitude of ways, including decreased health and immunity. Cattle challenged by fescue are often grazing an environment favorable for development gastrointestinal nematodes (GIN). Interactions parasite challenge may result further economic losses. Many producers treat animals regularly GIN parasites with little insight on necessi...

The experiment examined the prediction that chewing gum at learning and/or recall facilitated subsequent word recall. Chewing gum at learning significantly impaired recall, indicating that the chewing of gum has a detrimental impact upon initial word encoding. In addition, a context-dependent memory effect was reported for those participants who both learned and recalled in the absence of gum; ...

Background Chewing the ‘amphetamine like’ khat leaf in the Arabian Peninsula and East Africa communities emerges currently as a public health threat. It may impact health directly or through family dysfunction and alteration of agricultural practices. There is little information about khat chewing among Yemeni women. Understanding the context of khat chewing in women is important if preventive ...