ESIMERKKEJÄ:
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Tuulivoimaloiden infraääni
J
Acoust Soc Am. 2015 Mar;137(3):1356-65. Doi: 10.1121/1.4913775.
A
theory to explain some physiological effects of the infrasonic
emissions at some wind farm sites.
Abstract
For
at least four decades, there have been reports in scientific
literature of people experiencing motion sickness-like symptoms
attributed to low-frequency sound and infrasound. In the last several
years, there have been an increasing number of such reports with
respect to wind turbines; this corresponds to wind turbines becoming
more prevalent. A study in Shirley, WI, has led to interesting
findings that include: (1) To induce major effects, it appears that
the source must be at a very low frequency, about 0.8 Hz and below
with maximum effects at about 0.2 Hz; (2) the largest, newest wind
turbines are moving down in frequency into this range; (3) the
symptoms of motion sickness and wind turbine acoustic emissions
"sickness" are very similar; (4) and it appears that the
same organs in the inner ear, the otoliths may be central to both
conditions. Given that the same organs may produce the same symptoms,
one explanation is that the wind turbine acoustic emissions may, in
fact, induce motion sickness in those prone to this affliction.
PMID:
25786948
DOI:
10.1121/1.4913775
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Kuulokynnys
Matalan frekvenssin
ja infraäänialueen frekvenssien kuulemisen kynnysrajaa on luodattu
vaopaaehtoisilta tähän tarkoitukseen kehitetyllä menetelmällä
Jaksolukualue 2 Hz- 125 Hz saadaan havaittua. Tällaista aliteta
voidaan käyttää stimuksen kalibroimiseen enen
aivokuvaustutkimuksia.
J
Acoust Soc Am. 2015 Apr;137(4):EL347-53. doi: 10.1121/1.4916795.
Infrasonic and
low-frequency insert earphone hearing threshold.
Abstract
Low-frequency and
infrasonic pure-tone monaural hearing threshold data down to 2.5 Hz
are presented. These measurements were made by means of a newly
developed insert-earphone source. The source is able to generate
pure-tone sound pressure levels up to 130 dB between 2 and 250 Hz
with very low harmonic distortions. Behavioral hearing thresholds
were determined in the frequency range from 2.5 to 125 Hz for 18
otologically normal test persons. The median hearing thresholds are
comparable to values given in the literature. They are intended for
stimulus calibration in subsequent brain imaging investigations.
PMID:
25920888
DOI:
[Indexed for
MEDLINE]
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Millä neurokemiallisella tavalla infraääni vaikuttaa haittaa hermokudoksessa?
Neurochem
Res. 2014 May;39(5):833-42. doi: 10.1007/s11064-014-1277-3. Epub
2014 Mar 15.Involvement
of connexin43 in the infrasonic noise-induced glutamate release by
cultured astrocytes. Jiang
S1,
Wang
YQ, Xu
CF, Li
YN, Guo
R, Li
L.
Abstract
Infrasonic
noise/infrasound is a type of environmental noise that threatens
public health as a nonspecific biological stressor. Glutamate-related
excitotoxicity is thought to be responsible for infrasound-induced
impairment of learning and memory. In addition to neurons, astrocytes
are also capable of releasing glutamate. In the present study, to
identify the effect of infrasound on astroglial glutamate release,
cultured astrocytes were exposed to infrasound at 16 Hz, 130 dB
for different times. We found that infrasound exposure caused a
significant increase in glutamate levels in the extracellular fluid.
Moreover, blocking the connexin43 (Cx43) hemichannel or gap junction,
decreasing the probability of Cx43 being open or inhibiting of Cx43
expression blocked this increase. The results suggest that glutamate
release by Cx43 hemichannels/gap junctions is involved in the
response of cultured astrocytes to infrasound.
PMID:
24634254
- Aivojen plastisuudelle olennainen lipidien vaihtuminen häiriintyy ,
Aivothan ovat rasvamoduli, joka uudistaa lipidejään 20 % n. viikossa vauhdilla ja tässä järjestelmässä toimivat mm ne arakidonihappoperäiset johdannaiset ( "endokannabinoidit2) ja siihen järjestelmään tarvitaan essentiellejä rsahappoja (linoli, linoleeni EPA, DHA ovat näitä tunnettuja essentiellejä rasvahappoja) ).
Infraääni ja near infrasound frequences näyttää olevan muutamille helppoa käsittää
https://www.youtube.com/watch?v=_ytAq9sOXMo
Tästä endokannabinoidikartasta olen kirjoittanut molekyylejä muistiin rasvahappoblogiini, joten viittaan näihin vanhoihin muisiinpanoihin:koska nyt sain tietää endokanabinoidiresedptorin "uudesta" stimulaattorista infraäänestä, joka pitää ottaa ilemsiesti huomioon työsuojelussa koneitten suhteen eräänlaisena infraäänipitoisuuden suositeltuna korkeinpana raja-arvona- tietty nämä oavt olemassa, kun ne vain hakee esiin. Moni infraääni lähde on man made ja kuuluu viimeisiin nykyaikaisiin lisiin miljöössä.
[Indexed
for MEDLINE] Acta
Biochim Biophys Sin (Shanghai). 2015 Aug;47(8):647-53. doi:
10.1093/abbs/gmv049. Epub 2015 Jun 9.
Involvement of
cannabinoid receptors in infrasonic noise-induced neuronal
impairment.
Ma
L1, He
H2, Liu
X1, Zhang
G1, Li
L1, Yan
S3, Li
K4, Shi
M5.
Abstract
Excessive
exposure to infrasound, a kind of low-frequency but high-intensity
sound noise generated by heavy transportations and machineries, can
cause vibroacoustic disease which is a progressive and systemic
disease, and finally results in the dysfunction of central nervous
system. Our previous studies have demonstrated that glial
cell-mediated inflammation may contribute to infrasound-induced
neuronal impairment, but the underlying mechanisms are not fully
understood. Here, we show that cannabinoid (CB) receptors may be
involved in infrasound-induced neuronal injury. After exposure
to infrasound at 16 Hz and 130 dB for 1-14 days, the expression of CB
receptors in rat hippocampi was gradually but significantly
decreased. Their expression levels reached the minimum after 7- to
14-day exposure during which the maximum number of apoptotic cells
was observed in the CA1. 2-Arachidonoylglycerol (2-AG), an
endogenous agonist for CB receptors, reduced the number of
infrasound-triggered apoptotic cells, which, however, could be
further increased by CB receptor antagonist AM251. In animal behavior
performance test, 2-AG ameliorated the infrasound-impaired learning
and memory abilities of rats, whereas AM251 aggravated the
infrasound-impaired learning and memory abilities of rats.
Furthermore, the levels of proinflammatory cytokines tumor necrosis
factor alpha and interleukin-1β in the CA1 were upregulated after
infrasound exposure, which were attenuated by 2-AG but further
increased by AM251. Thus, our results provide the first evidence that
CB receptors may be involved in infrasound-induced neuronal
impairment possibly by affecting the release of proinflammatory
cytokines.
©
The Author 2015. Published by ABBS Editorial Office in association
with Oxford University Press on behalf of the Institute of
Biochemistry and Cell Biology, Shanghai Institutes for Biological
Sciences, Chinese Academy of Sciences.
KEYWORDS:
cannabinoid receptors; infrasound; neuronal impairment;
proinflammatory cytokines; vibroacoustic disease
Infraääni ja near infrasound frequences näyttää olevan muutamille helppoa käsittää
https://www.youtube.com/watch?v=_ytAq9sOXMo
Tästä endokannabinoidikartasta olen kirjoittanut molekyylejä muistiin rasvahappoblogiini, joten viittaan näihin vanhoihin muisiinpanoihin:koska nyt sain tietää endokanabinoidiresedptorin "uudesta" stimulaattorista infraäänestä, joka pitää ottaa ilemsiesti huomioon työsuojelussa koneitten suhteen eräänlaisena infraäänipitoisuuden suositeltuna korkeinpana raja-arvona- tietty nämä oavt olemassa, kun ne vain hakee esiin. Moni infraääni lähde on man made ja kuuluu viimeisiin nykyaikaisiin lisiin miljöössä.
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