Tel-Hai College is a college located in Tel Hai in northern Israel, near Kibbutz Kfar Giladi and north of Kiryat Shmona.The college offers academic and continuing education programs for approximately 4,500 students, 70 percent of whom come from outside the Galilee. Minorities comprise about 10 percent of the student body. The college offers degrees in life science, social science, computer science and the humanities.The college sees itself as "an agent of social and economic development in the highly strategic Upper Galilee region." Because of its location at the country's farthest northern border, Tel Hai's mandate extends beyond the area of education, to include opportunities for individual and community development and closing social and economic rifts.About 60 percent of the school's instructors live in the region. Some teachers from other Israeli universities fly up from points south on a weekly basis to teach at the College as well. Wikipedia.
Martinez J.-J.I.,Tel-Hai Academic College
Arthropod-Plant Interactions | Year: 2010
The Enemy hypothesis is a theoretical framework for understanding the adaptive nature of galls induced in host plants by insects. Contrary to other gall inducing insects, like Cynipids or sawflies, this hypothesis has not been studied for the gall aphids on pistachio trees in the Middle East. Galls on plants are supposed to protect their inducers from other organisms, including herbivores feeding on the host plant and possibly feeding on the gall tissue. Assuming that among aphid enemies there are numerous insects which have to perforate the gall wall to access the aphids inside, determining whether the gall wall has anti-insect properties should be one of the first steps in dealing with this hypothesis. In the present research using Baizongia pistaciae [L.], an aphid that creates perfectly closed galls in Pistacia palaestina Boiss, laboratory experiments were first conducted on a herbivore, the stored grain pest, Tribolium castaneum Herbst, to assess chemical anti-insect activities of the gall tissue, and an effort was made to understand why these properties do not harm the aphids inside the gall. Addition of fresh gall tissue to food reduced the population growth of flour beetles. Non-polar organic extracts had contact toxicity for larvae of these insects, and an impact on the feeding preferences of the adults. These results indicate chemical anti-insect activities of the gall tissue. The research also reveals that the permeability of the gall wall to non-polar volatile compounds is important to the survival of the aphids inside the gall cavity. These findings do not allow us to reject the Enemy hypothesis in the gall-inducing aphids/Pistacia trees interactions. © Springer Science+Business Media B.V. 2009.
Aviram M.,Rambam Medical Center |
Vaya J.,Tel-Hai Academic College |
Vaya J.,Galilee Research Institute
Current Opinion in Lipidology | Year: 2013
Purpose of review: Improving serum levels of HDL and its subfractions, as well as, oxidative/inflammatory properties has become a fundamental aim in today's atherosclerosis research. Efforts to reach this goal are paralleled by achievements in drug development toward decreasing serum LDL levels and oxidative status. Recent findings: Paraoxonase1 (PON1) is an HDL-associated enzyme that is deemed responsible for many of the HDL's antiatherogenic and cardioprotective characteristics. PON1 is highly sensitive to variations in its milieu, and endogenous compounds (fatty acids, phospholipids), nutritional ingredients (flavonoids and other antioxidants), and environmental elements (reactive nitrogen and oxygen species, metals, surfactants), significantly affect the enzyme's activities. PON1 was shown to be responsible for some of the HDL antiatherogenic characteristics such as HDL-mediated cholesterol efflux from macrophages, and the inhibition of LDL oxidation. Summary: The present review summarizes the recent literature related to various elements in PON1's milieu that regulate its activities, with an emphasis on its interrelation with components of the human carotid atherosclerotic lesion (plaque) which are in constant contact with circulating HDL-associated PON1. © 2013 Wolters Kluwer Health.
Zemacha T.,Tel-Hai Academic College
Physics of Fluids | Year: 2015
We consider a high-Reynolds-number gravity current generated by suspension of heavier particles in fluid of density pi, propagating along a channel into an ambient fluid of the density pi. The bottom and top of the channel are at z = 0, H, and the cross section is given by the quite general - f1(z) ≤ y ≤ f2(z) for 0 ≤ z ≤ H. The flow is modeled by the one-layer shallow-water equations obtained for the time-dependent motion which is produced by release from rest of a fixed volume of mixture from a lock. We solve the problem by the finite-difference numerical code to present typical height h(x, t), velocity u(x, t), and volume fraction of particles (concentration) f(x, t) profiles. The methodology is illustrated for flow in typical geometries: power-law (f (z) = za and f (z) = (H - z)a, where a is positive constant), trapezoidal, and circle. In general, the speed of propagation of the flows driven by suspensions decreases compared with those driven by a reduced gravity in homogeneous currents. However, the details depend on the geometry of the cross section. The runout length of suspensions in channels of power-law cross sections is analytically predicted using a simplified depth-averaged "box" model. The present approach is a significant generalization of the classical gravity current problem. The classical formulation for a rectangular channel is now just a particular case, f (z) = const., in the wide domain of cross sections covered by this new model. © 2015 AIP Publishing LLC.
Lavee D.,Tel-Hai Academic College
Waste Management | Year: 2010
The paper presents a full cost-benefit analysis of a deposit-refund program for beverage containers in Israel. We examine all cost elements of the program - storage, collection, and treatment costs of empty containers, and all potential benefits - savings in alternative treatment costs (waste collection and landfill disposal), cleaner public spaces, reduction of landfill volumes, energy-savings externalities associated with use of recycled materials, and creation of new workplaces. A wide variety of data resources is employed, and some of the critical issues are examined via several approaches. The main finding of the paper is that the deposit-refund program is clearly economically worthwhile. The paper contributes to the growing body of literature on deposit-refund programs by its complete and detailed analysis of all relevant factors of such a program, and also specifically in its analysis of the savings in alternative waste management costs. This analysis reveals greater savings than are usually assumed, and thus shows the deposit-refund program to be highly efficient. © 2009 Elsevier Ltd. All rights reserved.
Lavee D.,Tel-Hai Academic College
Agricultural Water Management | Year: 2010
This paper analyzes the effect of water supply uncertainty on farmers' choice of crop portfolio. The paper presents an innovative model to estimate the value of uncertainty of water supply, and then tests the model using data from Israel. The modeling results provide support to the hypothesis that uncertainty induces farmers to prefer crops whose growth requires less agricultural capital accumulation, despite their lower profitability (agricultural capital referring to trees and other plants which take a significant period of time to mature). This is due to the risk that in a given year water supply will fall below a certain minimal level, thereby causing loss of all accumulated capital. The paper also examines a government intervention policy for mitigating uncertainty: use of reclaimed wastewater in crop irrigation as a supplement for freshwater supply. The costs associated with constructing the required wastewater reclamation and supply facilities are compared to the benefits of additional farm income earned through a more certain on-farm water supply. It is shown that under certain conditions implementation of this policy is indeed economically worthwhile. © 2010 Elsevier B.V.