Two new species, Hypancistrus phantasma and Hypancistrus margaritatus, are described based on material from the Rio Negro drainage. Both species are distinguished from congeners by unique color patterns. Hypancistrus phantasma is described from the Rio Uaupes and differs from congeners by having a tan body with small dark spots (vs. dark with light spots or with saddles or stripes). Hypancistru...

Dams trap sediments in the upstream reservoir, thus the continuity in sediment transport along the river is interrupted. Several negative aspects related to the lack of sediment supply were observed downstream many dams and the artificial replenishment of sediment was applied as a method to restore natural morphological conditions. The replenishment technique may be seen as a pulse of sediments...

Ossified chronic subdural hematoma is a very rarely seen entity. We present here a 22-year-old male who had presented with severe headache consequent to brain compression caused by bifronto-parieto-temporal ossified subdural hematoma. We evaluated our method and surgical intervention in the light of the literature. The question whether the ossified membrane should be excised or not excised in t...

A long-term solution to the climate and air pollution crises facing world today includes electrification of almost all energy obtaining that electricity from clean, renewable sources. Whereas electric alternatives exist for nearly sectors, they do not long-distance, heavy passenger aircraft, freight locomotives, or ships. Of particular note, solutions currently military combat vehicles, such as...

The requirements for the tactical and technical characteristics of suspension systems light armored vehicles are constantly growing, taking into account increase in intensity their loads. It is necessary to improve system, particular torsion shafts, which most responsible loaded system vehicles. existing traditional methods calculating shafts do not meet modern requirements. Today, there a cont...

Mineral weathering in soils is an important source of many nutrients to forest ecosystems. Apatite, a Ca phosphate mineral, occurs in trace amounts in virtually all igneous and metamorphic rocks and is often found as small mineral inclusions in more weathering-resistant silicate minerals. To better understand the distribution of apatite in soils and its exposure to soil solutions, a sequential ...