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Pethidine is the most widely used opioid in labour and delivery. [16] It has fallen out of favour in some countries, such as the United States, in favour of other opioids, due to its potential drug interactions, especially with serotonergics, and its neurotoxic metabolite, norpethidine. [10]
Hydroxypethidine (Bemidone) is an opioid analgesic that is an analogue of the more commonly used pethidine (meperidine). Hydroxypethidine is slightly more potent than meperidine as an analgesic, 1.5x meperidine in potency, [2] and it also has NMDA antagonist properties like its close relative ketobemidone.
Pethidinic acid (meperidinic acid, pethidine intermediate C) is a 4-phenyl piperidine derivative that is both a metabolite of and a precursor to pethidine (meperidine). [2] [3] It is scheduled by UN Single Convention on Narcotic Drugs. It is a Schedule II Narcotic controlled substance in the United States and has an ACSCN of 9234.
Soil chemistry is the study of the chemical characteristics of soil.Soil chemistry is affected by mineral composition, organic matter and environmental factors. In the early 1870s a consulting chemist to the Royal Agricultural Society in England, named J. Thomas Way, performed many experiments on how soils exchange ions, and is considered the father of soil chemistry. [1]
Dutch Standards are environmental pollutant reference values (i.e., concentrations in environmental media) used in environmental remediation, investigation and cleanup. [ 1 ] Barring a few exceptions, the target values are underpinned by an environmental risk analysis wherever possible and apply to individual substances.
Soil health is a state of a soil meeting its range of ecosystem functions as appropriate to its environment. In more colloquial terms, the health of soil arises from favorable interactions of all soil components (living and non-living) that belong together, as in microbiota, plants and animals.
Much like a straw in a glass draws liquid, the pump draws liquid (including free-product) and soil gas up the tube in the same process stream. Pumping lifts LNAPLs, such as oil, off the top of the water table and from the capillary fringe (i.e., an area just above the saturated zone, where water is held in place by capillary forces).
Norpethidine (normeperidine, pethidine intermediate B) is a 4-phenylpiperidine derivative that is both a precursor to, and the toxic metabolite of, pethidine (meperidine). It is scheduled by UN Single Convention on Narcotic Drugs. It is a Schedule II Narcotic controlled substance in the United States and has an ACSCN of 9233.