8, 9 In addition to primary inherited disorders in biogenic amine biosynthesis in brain as studied by CSF levels of biogenic amine and biopterin metabolites, there are secondary abnormalities of these brain neurotransmitters due to other genetic disorders.
For example, diverse mouse models reproduce the reduced levels of biogenic amines and brain-derived neurotrophic factor (BDNF) that are found in the brains of RTT patients (Wang et al., 2006; Deng et al., 2007; Li et al., 2012; Chang et al., 2006).
In 1992, magnetite was found in the human brain [23] and studies since then have associated elevated levels of biogenic magnetite with both aging and AD [24 26].
In 1992, biogenic magnetite (Fe3O4), a ferrimagnetic iron oxide, was discovered in the human brain [6] and studies since then have shown elevated levels of biogenic magnetite with both aging and Alzheimer's disease [8] [11].
To establish the relationship between brain neurochemistry and behavioral disruptions in patDp/+ mice, we quantified levels of biogenic monoamines ex vivo, including 5-HT and its major metabolite 5-hydroxyindoleacetic acid (5-HIAA), using HPLC in several adult brain regions.
In addition, there is a growing appreciation that prelaunch spacecraft cleaning protocols will be required to reduce the levels of biogenic signature molecules on spacecraft to levels that will not compromise life-detection experiments on landers.
8 In an early study of biogenic amines in Rett syndrome, decreased levels of biogenic amine metabolites of dopamine, serotonin, and norepinephrine were demonstrated in CSF from children with that disorder.
The BH4 regeneration enzymes are not required for steady-state levels of biogenic amines, but become rate limiting in conditions of reduced BH4 synthesis.
It is assumed that the levels of biogenic amines such as 5-hydroxytryptamine (5-HT) and norepinephrine are reduced in persons with FMS.
Indirect effects could result from increasing or decreasing anthropogenic emissions via changes in human behavior or from altering the levels of biogenic emissions because of higher temperatures and land cover change.
