Since the discovery of fire, the wood of trees has been an invaluable resource for Humanity. In the Paleolithic, hunters prepared their weapons with the hardest woods. In Europe, they generally make use of them collecting strong and durable wood, such as that of oaks (Quercus ilex) and ...
α8, and β1 for the high-affinity nAChR). In fact, the existence of multiple binding sites in insects seems to appear as a relatively common feature of neonicotinoids, since it has also been observed in the aphid (Aphis craccivora) and in the locust (Locusta migratoria) (Wiesner and Kays...
for the guar gum. For example, other polysaccharide gums (locust bean, plantago, etc.), and polyvinyl alcohol. Any compound bearing two or more methylol groups (--CH2OH) as a substitute for the dimethylolurea is believed to be a functional equivalent. For example, a low molecular weight ...
发明人: INTER-WOOD-MASCHINEN G.M.B.H. + CO. K.G. 摘要: A strip steel knife for wood shaving machines, wherein each blade is provided at spaced intervals with interruptions in the cutting edge to effect the separation of the shavings.收藏...
Described is a process for preparing hydrogenated derivatives of 2,6,6-trimethyl cyclohexene derivatives by means of treating said derivatives with hydrogen in the presence of a supported palladium catalyst such as palladium-on-calcium carbonate or palladium-on-barium sulfate in the presence of a qui...
Bead, small, usually round object made of glass, wood, metal, nut, shell, bone, seed, or the like, pierced for stringing. Among primitive peoples, beads were worn as much for magical as for decorative purposes; hence, little variation was allowed in thei