Amyloid-β deposition in Alzheimer's disease is thought to start while individuals are still cognitively unimpaired and it is hypothesized that after an early phase of fast accumulation, a plateau is reached by the time of cognitive decline. However, few longitudinal Pittsburgh compound B-positron emission tomography studies have tested this hypothesis, and with conflicting results. The purpose ...

We have compared the effect of toxic Cu and Cd concentrations on growth, metal accumulation, and chloroplast ultrastructure of willow (Salix purpurea L.) and reed [Phragmites australis (Cav.) Trin. ex Steud.]. After a 10-day treatment, both species have tolerated to some extent the lowest concentration of both metals; however, plant growth was strongly reduced at the highest Cu and Cd concentra...

Concentrations of accumulated heavy metals were compared between the terrestrial bryophyte Pohlia nutans and needles and bark of Larix decidua collected on a dump situated in the vicinity of cokeand sulphuric acid-producing factories and a municipal thermal-electric power station. The dump consisted of heavily polluted mine and smelter wastes located near Walbrzych (southwestern Poland). The pl...

The subject of study in this article is the voltage ranges, methods, and tools for prototyping independent sources power supply artificial lighting home appliances with reuse only widespread components. goal to improve efficiency creation use appliances. Task: analyze history development standards households; existing autonomous types batteries; different loads; find rational ranges based on fu...

Many marine algae are strong accumulators of halogens. Commercial iodine production started by burning seaweeds in the 19th century. The high content certain has potential pharmaceutical and nutritional applications. While metabolism brown is linked to oxidative metabolism, with iodide serving function an inorganic antioxidant protecting cell thallus surface against reactive oxygen species impl...

Plants vary considerably in their physiological response to selenium (Se). Some plant species growing on seleniferous soils are Se tolerant and accumulate very high concentrations of Se (Se accumulators), but most plants are Se nonaccumulators and are Se-sensitive. This review summarizes knowledge of the physiology and biochemistry of both types of plants, particularly with regard to Se uptake ...

The accumulation of heavy metals in plant pollen and nectar exposes pollinators to environmental contaminations. Although honeybees act as biofilters impede the transfer honey, possible antagonistic interactions could negatively affect mineral composition bee-processed nectar. aim this study was assess level harmful (Cd, Pd, Hg, Al, Ni Tl) relation essential macro- (K, Ca Mg) microelements (Mn,...

Hash tables are fundamental data structures that optimally answer membership queries. Suppose a client stores n elements in a hash table that is outsourced at a remote server. Authenticating the hash table functionality, i.e., verifying the correctness of queries answered by the server and ensuring the integrity of the stored data, is crucial because the server, lying outside the administrative...

Accumulators provide a way to succinctly represent a set with elements drawn from a given domain, using an accumulation value. Subsequently, short proofs for the set-membership (or non-membership) of any element from the domain can be constructed and efficiently verified with respect to this accumulation value. Accumulators have been widely studied in the literature, primarily, as an authentica...

This paper describes the logical structure of the RC 4000, a 24-bit, binary computer designed for multiprogramming operation. The design is characterized by multiple accumulators, expandable storage, low-speed and high-speed data channels, storage protection, and program interruption. Processing operations include byte manipulation, word comparison, and integer and floating-point arithmetic. Ty...