The DNS relies on caching to ensure high scalability and good performance. In optimizing caching, TTL adjustment provides a means of balancing between query load and TTLdependent performances such as data consistency, load balancing, migration time, etc. To gain the desired balance, TTL adjustment depends on predictions of query loads under alternative TTLs. This paper proposes a model of DNS s...

We begin by describing the basics of the DNS protocol. We continue with a survey of known attacks on DNS, and finalize with a genuine, deterministic attack against BIND’s SRTT (Smoothed Round Trip Time) algorithm. Our method enables derandomization of the target name server thus reduces the expected time of DNS cache poisoning attacks.

DNS servers often fail or have bad implementations of algorithms that decrease the efficiency of the DNS system. We introduce a method for clustering misconfigured DNS sources. Using machine learning methods, we analyzed 24 hours of DNS requests that were collected on the A-root DNS server. The 50 gigabyte data set was a log containing 10-40 million requests per hour. We selected the hour of 1:...

BACKGROUND Chronic hyperglycemia enhances the formation of advanced glycation endproducts (AGEs) and reactive oxygen species (ROS), contributing to diabetic complications. Thus, controlling blood glucose levels, inhibiting the formation of AGEs and reducing ROS are key therapeutic targets in early stage type 2 diabetes. METHODS The inhibitory effects of seven commercial liquid nutritional sup...

Juvenile crayfish [Cambarus bartonii cavatus] were taken from two nearby sites on Big Four Creek, Vinton County, OH. Water from upstream (UpS) and downstream (DnS) sites had total conductivities of 250 |iS and 600 \xS (|J,S = jimho/cm) at 25° C. Non-carbonate conductivity was largely made up of sulfuric acid and heavy metals. Carbonates represented 40% of the conductivity at UpS but were absent...

The biosynthesis of metallic nanoparticles (NPs) using biological systems such as fungi has evolved to become an important area of nanobiotechnology. Herein, we report for the first time the extracellular synthesis of highly stable silver NPs (AgNPs) using the nematophagous fungus Duddingtonia flagrans (AC001). The fungal cell-free filtrate was analyzed by the Bradford method and 3,5-dinitrosal...

The aim of the present work is to develop two-channel emitters to probe local hydrophobicity by means of fluorescence quenching within different biomimetic supramolecular environments. To achieve this goal, the dansyl (Dns) and tryptophan (Trp) fluorophores have been covalently attached to cholic acid (CA) in order to ensure simultaneous incorporation of the two emitting units into the same com...

Juvenile crayfish [Cambarus bartonii cavatus] were taken from two nearby sites on Big Four Creek, Vinton County, OH. Water from upstream (UpS) and downstream (DnS) sites had total conductivities of 250 |iS and 600 \xS (|J,S = jimho/cm) at 25° C. Non-carbonate conductivity was largely made up of sulfuric acid and heavy metals. Carbonates represented 40% of the conductivity at UpS but were absent...

two simple visible spectrophotometric methods are developed and validated for the quantification of modafinil using 1,2-naphthoquinone-4-sulphonic acid (nqs method) and 2,4-dinitrophenol (dnp method) as analytical reagents. the nqs method involves the reaction of modafinil with 1,2-naphthoquinone-4-sulphonate in alkaline medium at room conditions to form a yellow colored product exhibiting maxi...

Article history: Received on: 26/11/2014 Revised on: 25/01/2015 Accepted on: 18/02/2015 Available online: 28/03/2015 The present paper aims to develop a simple direct colorimetric method for the determination of cerberin in rat plasma without any previous chemical separation of the cerberin from Cerbera odollam. The method is based on reaction of the cardenolide group of cerberin with 3,5-dinit...