Role of the B complex in the genetic control of the Rous sarcoma virus induced tumors in chickens

Eight highly inbred lines, with inbreeding coefficients ranging from 81% to 97% and segregating for eight different B complex alleles were used in this study. Also included were two moderately inbred (40%) heavy-breed lines and one outbred Leghorn line segregating for the blood group alleles, B(\u271), B(\u272) and B(\u2719). Birds were blood-typed for B locus alloantigens at 5 weeks of age. Each genetic group was challenged with Rous sarcoma virus subgroups A, B and C. Tests were based on both wing web-challenge (WWC) on 5-week-old chicks and on the chorioallantoic membranes of 12-day embryos (CAM) test;These results indicate that the B complex-linked genes, controlling tumor expression, belong to a multiple allelic series at a single B complex-linked locus. In addition, the results from both the WWC and CAM test support the findings that the tv loci for cellular resistance maps outside the B complex. Also, the statistical evidence verifies the earlier findings that tva and tvc loci are linked. As expected, most of the variation in tumor regression in susceptible birds was linked to the B complex. Thus, part of the genetic variation in tumor regression may be controlled outside the B complex;Genes coding for control of the fate of Rous sarcoma virus subgroup A induced tumors are evidently closely linked to the locus controlling immune response to GAT. The latter maps within the Ir region of the B histocompatibility complex. These findings are important as possible criteria for detecting and selecting disease-resistant fowl

Thermal experimental dielectric characterization of cost-fewer low-density polyethylene nanocomposites

Polymer properties can be experimentally tailored by adding small amounts of different fillers, but they are expensive with respect to the classical polymer materials. This paper has been studied the enhancement and controlling of electric and dielectric properties of low-density polyethylene (LDPE) polymer materials by cost-fewer nanoparticles. Certain percentages of clay and fumed silica nanoparticles have been enhanced electric and dielectric properties of low-density polyethylene nanocomposite. Dielectric spectroscopy has been measured the electric and dielectric properties of low-density polyethylene with and without nanofillers at various frequencies (10Hz-100kHz) and temperatures (20°C, 40°C and 60°C). Also, it has been investigated the optimum percentages of nanofillers with respect to nanofillers type, filler concentration and temperature for enhancing electric and dielectric characterization of low-density polyethylene. Experimental measurements have been carried out on dielectric breakdown strength of new polyethylene nanocomposites materials under variant electric fields (uniform, and non-uniform) and variant temperatures. It has been specified the effective nanofillers factors on dielectric breakdown strength of polyethylene nanocomposites materials

Stabilization of Max-Min Fair Networks without Per-Flow State

Let a flow be a sequence of packets sent from a source computer to a destination computer. Routers at the core of the Internet do not maintain any information about the flows that traverse them. This has allowed for great speeds at the routers, at the expense of providing only best-effort service. In this paper, we consider the problem of fairly allocating bandwidth to each flow. We assume some flows request a constant amount of bandwidth from the network. The bandwidth that remains is distributed fairly among the rest of the flows. The fairness sought after is max-min fairness, which assigns to each flow the largest possible bandwidth that avoids affecting other flows. The distinguishing factor to other approaches is that routers only maintain a constant amount of state, which is consistent with trends in the Internet (such as the proposed Differentiated Services Internet architecture). In addition, due to the need for high fault-tolerance in the Internet, we ensure our protocol is self-stabilizing, that is, it tolerates a wide variety of transient faults. Key words: networks stabilization, max-min fairness, quality of service, computer 1

Synthesis and antioxidant evaluation of some new pyridines

One-pot condensation of malononitrile (1), 4-methylpentan-2-one (2), aryl carboxaldehyde (3a-f) and ammonium acetate in ethanol afforded 2-amino-5-isopropyl-4-(4-aryl)-6-methylnicotinonitriles (4a-f). The antioxidant activity of the new synthesized compounds was evaluated and the result showed all compound exhibited weak anti-oxidant activities

A hybrid approach based on personality traits for hate speech detection in Arabic social media

In recent years, as social media has grown in popularity, people have gained the ability to freely share their views. However, this may lead to users' conflict and hostility, resulting in unattractive online environments. Hate speech relates to using expressions or phrases that are violent, offensive, or insulting to a minority of people. The number of Arab social media users is quickly rising, and this is being followed by an increase in the frequency of cyber hate speech in the area. Therefore, the automated detection of Arabic hate speech has become a major concern for many stakeholders. The intersection of personality learning and hate speech detection is a relatively less studied niche. We suggest a novel approach that is focused on extracting personality trait features and using these features to detect Arabic hate speech. The experimental results show that the proposed approach is superior in terms of the macro-F1 score by achieving 82.3% compared to previous work reported in the literature

Bounded-time fault-tolerant rule-based systems

Two systems concepts are introduced: bounded response-time and self-stabilization in the context of rule-based programs. These concepts are essential for the design of rule-based programs which must be highly fault tolerant and perform in a real time environment. The mechanical analysis of programs for these two properties is discussed. The techniques are used to analyze a NASA application