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10.1038/s41598-021-03862-z http://scihub22266oqcxt.onion/10.1038/s41598-021-03862-z 34966168!8716525!34966168     free     free     free Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 267.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534       Sci+Rep 2021 ; 11 (1): 24490 Nephropedia Template TP {{tp|p=34966168|t=2021. Discrepancy of particle passage in 101 mask batches during the first year of the Covid-19 pandemic in Germany |pdf=|usr=}}{{34966168}} gab.com Text Discrepancy of particle passage in 101 mask batches during the first year of the Covid-19 pandemic in Germany JO: Sci Rep http://www.kidney.de/pget.php?&tw=1&pmid=34966168 #FOAvip During the first wave of Covid-19 infections in Germany in April 2020, clinics reported a shortage of filtering face masks with aerosol retention> 94% (FFP2 & 3, KN95, N95). Companies all over the world increased their production capacities, but quality control of once-certified materials and masks came up short. To help identify falsely labeled masks and ensure safe protection equipment, we tested 101 different batches of masks in 993 measurements with a self-made setup based on DIN standards. An aerosol generator provided a NaCl test aerosol which was applied to the mask. A laser aerosol spectrometer measured the aerosol concentration in a range from 90 to 500 nm to quantify the masks' retention. Of 101 tested mask batches, only 31 batches kept what their label promised. Especially in the initial phase of the pandemic in Germany, we observed fluctuating mask qualities. Many batches show very high variability in aerosol retention. In addition, by measuring with a laser aerosol spectrometer, we were able to show that not all masks filter small and large particles equally well. In this study we demonstrate how important internal and independent quality controls are, especially in times of need and shortage of personal protection equipment. Twit Text FOAVip Discrepancy of particle passage in 101 mask batches during the first year of the Covid-19 pandemic in Germany ????Sci Rep http://www.kidney.de/pget.php?&tw=1&pmid=34966168 #FOAvip Twit Text # Free Paper on # # # # # LINK http://www.kidney.de/pget.php?&tw=1&pmid=34966168 #FOAvip English Wikipedia <ref>{{Cite pmid|34966168}}</ref> Discrepancy of particle passage in 101 mask batches during the first year of the Covid-19 pandemic in Germany #MMPMID34966168 Hirschwald LT; Herrmann S; Felder D; Kalde AM; Stockmeier F; Wypysek D; Alders M; Tepper M; Rubner J; Brand P; Kraus T; Wessling M; Linkhorst J Sci Rep 2021[Dec]; 11 (1): 24490 PMID34966168show ga During the first wave of Covid-19 infections in Germany in April 2020, clinics reported a shortage of filtering face masks with aerosol retention> 94% (FFP2 & 3, KN95, N95). Companies all over the world increased their production capacities, but quality control of once-certified materials and masks came up short. To help identify falsely labeled masks and ensure safe protection equipment, we tested 101 different batches of masks in 993 measurements with a self-made setup based on DIN standards. An aerosol generator provided a NaCl test aerosol which was applied to the mask. A laser aerosol spectrometer measured the aerosol concentration in a range from 90 to 500 nm to quantify the masks' retention. Of 101 tested mask batches, only 31 batches kept what their label promised. Especially in the initial phase of the pandemic in Germany, we observed fluctuating mask qualities. Many batches show very high variability in aerosol retention. In addition, by measuring with a laser aerosol spectrometer, we were able to show that not all masks filter small and large particles equally well. In this study we demonstrate how important internal and independent quality controls are, especially in times of need and shortage of personal protection equipment. |Aerosols[MESH] |COVID-19/*prevention & control/*transmission[MESH] |Filtration/instrumentation[MESH] |Germany[MESH] |Humans[MESH] |Masks/standards/*statistics & numerical data/trends[MESH] |N95 Respirators/standards/statistics & numerical data[MESH] |Occupational Exposure/prevention & control[MESH] |Pandemics/prevention & control[MESH] |Personal Protective Equipment/standards[MESH] |Quality Control[MESH] |Respiratory Protective Devices/standards[MESH]Discrepancy of particle passage in 101 mask batches during the first y(epmc).pdf DeepDyve Pubget Overpricing