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Vor 21 Stunden · Manganese forms a large variety of organometallic derivatives, i.e., compounds with Mn-C bonds. The organometallic derivatives include numerous examples of Mn in its lower oxidation states, i.e. Mn(−III) up through Mn(I). This area of organometallic chemistry is attractive because Mn is inexpensive and of relatively low toxicity.
Vor 21 Stunden · Stimulants (also known as central nervous system stimulants, or psychostimulants, or colloquially as uppers) are a class of drugs that increase the activity of the brain. They are used for various purposes, such as enhancing alertness, attention, motivation, cognition, mood, and physical performance. Some of the most common stimulants are ...
Vor 21 Stunden · Master's degree. (varied by country and institution) A Doctor of Philosophy ( PhD, Ph.D., or DPhil; Latin: philosophiae doctor or doctor philosophiae) is a terminal degree that usually denotes the highest level of academic achievement in a given discipline and is awarded following a course of graduate study and original research.
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Vor 21 Stunden · History of abortion. Indirect advertisements for abortion services, like these in The Sun in 1842, were common during the Victorian era. At the time, abortion was illegal in New York. [1] The practice of induced abortion —the deliberate termination of a pregnancy —has been known since ancient times. Various methods have been used to perform ...
Vor 21 Stunden · Part of a series on Human history ↑ Prehistory (Stone Age) (Pleistocene epoch) Holocene Timelines Neolithic – Contemporary (10,000 BCE – Present) Age of the human race Recorded history (Common Era) Earliest records Protohistory Proto-writing Ancient Copper Age Bronze Age Iron Age Axial Age Classical antiquity Late antiquity Africa North America South America Oceania East Asia South Asia ...
Vor 21 Stunden · As of October 2016, single-wall carbon nanotubes have been registered through the European Union's Registration, Evaluation, Authorization and Restriction of Chemicals (REACH) regulations, based on evaluation of the potentially hazardous properties of SWCNT. Based on this registration, SWCNT commercialization is allowed in the EU up to 10 metric tons. Currently, the type of SWCNT registered ...
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