Hi James, for us, the suggestions of cling film / plastic wrap or just swapping keyboards and mice per person is the simplest - thanks to everyone for the many suggestions. Especially the latter, since only two people will operate the instruments.
UV light does not go around corners. It might be useful for fume hoods, but for most places, door handles and other curved surfaces are probably much more the infecting parts, while they escape the UV light. And vira are transported in water droplets, which are larger than 1um. Best, Tim On Tue, 5 May 2020 17:19:56 -0700 James Holton <jmhol...@lbl.gov> wrote: > All joking aside, there has been a furor of attention on UV-based > disinfection of late. Some of it is not entirely crazy. I.E. > Columbia University’s Center for Radiological Research has put > forward the idea of illuminating occupied public areas with > ultra-narrow-band UV-C (222 nm). > https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5552051/ > > Mind you, UV-C normally covers 100 - 280 nm, and the PPE requirements > for that (at LBNL at least) are extensive: polycarbonate safety > glasses and face shield with a mark U6 (UV protection), long-sleeved > clothing, and gloves. Basically: do not expose skin! > > The idea behind using monochromatic 222 nm radiation is that it is at > the edge of a very steep increase in the absorption of water, > protein, and other biologicals. Penetration depths are hard to > estimate because of the steep slope, but they are on the order of 1 > micron. So, smaller than a typical mamalian cell, but bigger than a > bacterium or virus. The paper above did not have any human subjects, > nor did it discuss how to deal with all the ozone, but the results > are intruiging. Needs further study. > > Personally, I think this would probably fog your corneas and perhaps > burn the thin skin on lips and other exposed mucosa. Hair I'd expect > to embrittle and fall apart eventually. Yes, hair is 40 microns thick > and the penetration depth is 1 micron, but photon's don't "stop" at > the penetration depth. 36% of them go deeper. Plastic in keyboards > too would probably bleach and flake with prolonged exposure. Ever > seen a keyboard left out in the sun for a few weeks? I'd worry a bit > about this micro-damage creating crevices where bugs could hide. > > I encourage you to bring this up with your Health and Safety people, > but make sure they are sitting down first. > > -James Holton > MAD Scientist > > On 4/29/2020 12:41 PM, Andrea Thorn wrote: > > > > Hi Tim! > > > > > > 100% alcohol is less effective than 80%, and in order to completely > > be sure, the keyboard needs not only to be wiped. One can buy > > keyboards that can be disinfected because they are waterproof, such > > as the Cherry JK-1068DE-2 for about 50 €. > > > > > > We clean the keyboards in our lab occasionally anyway, and have > > used 70% alcohol on them without problem. Disinfectant wipes, a > > detergent cleaner (such as Viss Glass & Flächen) and cotton swabs > > also offer some help. We wipe our mobile phones with a disinfectant > > wipe after washing our hands when arriving home/at work. > > > > I would also be really interested in what could be done with a UV > > light, if someone knows? > > > > If the computer is used by one person during the shift, individual > > keyboards for each person could be a solution. If people sit down, > > the desk surface, which may be touched, should likely also be wiped > > at the beginning and end of the shift I would say. > > > > Stay save and best wishes, > > > > > > > > Andrea. > > > > > > > > Am 29/04/2020 um 21:04 schrieb Diana Tomchick: > >> > >> 100% ethanol or isopropanol work really well on the microscopes, > >> I soak a Kimwipe and then clean the eyepieces and the knobs for > >> changing magnification and focus, as well as the door handles, > >> bench tops, etc. > >> > >> > >> Diana > >> > >> > >> ************************************************** > >> Diana R. Tomchick > >> Professor > >> Departments of Biophysics and Biochemistry > >> UT Southwestern Medical Center > >> 5323 Harry Hines Blvd. > >> Rm. ND10.214A > >> Dallas, TX 75390-8816 > >> diana.tomch...@utsouthwestern.edu > >> (214) 645-6383 (phone) > >> (214) 645-6353 (fax) > >> ------------------------------------------------------------------------ > >> *From:* CCP4 bulletin board <CCP4BB@JISCMAIL.AC.UK> on behalf of > >> Diana Tomchick <diana.tomch...@utsouthwestern.edu> > >> *Sent:* Wednesday, April 29, 2020 2:00 PM > >> *To:* CCP4BB@JISCMAIL.AC.UK > >> *Subject:* Re: [ccp4bb] disinfecting keyboards > >> > >> EXTERNAL MAIL > >> > >> You could try doing what my technician does with her keyboard; > >> she wraps it in a clear, thin food wrap that can be taped to the > >> back of the keyboard. This is usually done to keep food and other > >> things (liquids) from damaging the keyboard, but you could simply > >> replace the wrap every time someone else uses it. > >> > >> > >> Personally I like using a Kimwipe soaked with 100% isopropanol, > >> I've never yet encountered a keyboard that suffered from having > >> the writing removed with that or 100% ethanol. Both work and as > >> long as they are 100% (no water), the keyboard and mouse have no > >> issues. > >> > >> > >> Diana > >> > >> > >> ************************************************** > >> Diana R. Tomchick > >> Professor > >> Departments of Biophysics and Biochemistry > >> UT Southwestern Medical Center > >> 5323 Harry Hines Blvd. > >> Rm. ND10.214A > >> Dallas, TX 75390-8816 > >> diana.tomch...@utsouthwestern.edu > >> (214) 645-6383 (phone) > >> (214) 645-6353 (fax) > >> ------------------------------------------------------------------------ > >> *From:* CCP4 bulletin board <CCP4BB@JISCMAIL.AC.UK> on behalf of > >> Tim Gruene <tim.gru...@univie.ac.at> > >> *Sent:* Wednesday, April 29, 2020 1:53 PM > >> *To:* CCP4BB@JISCMAIL.AC.UK > >> *Subject:* [ccp4bb] disinfecting keyboards > >> Dear all, > >> > >> can you make suggestions for how to disinfect computer keyboards, > >> and instrument panels? > >> > >> Our facility is going to reboot next week, with shifts so that > >> people don't meet. The main interface will be the computer > >> keyboards, as well as the door of our X-ray diffractometer and the > >> mounting of the crystals. > >> > >> The keyboard labels may not like alcohols (and the efficiency of > >> injecting disinfecting through the USB cable is also under > >> discussion, so I heard). > >> > >> One way would be to use individual keyboards, and wearing gloves > >> for replugging, and to use gloves for mounting crystals. > >> > >> But maybe there are other ways that won't require gloves? > >> > >> Best regards, > >> Tim > >> > >> -- > >> -- > >> Tim Gruene > >> Head of the Centre for X-ray Structure Analysis > >> Faculty of Chemistry > >> University of Vienna > >> > >> Phone: +43-1-4277-70202 > >> > >> GPG Key ID = A46BEE1A > >> > >> ######################################################################## > >> > >> To unsubscribe from the CCP4BB list, click the following link: > >> https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=CCP4BB&A=1 > >> > >> ------------------------------------------------------------------------ > >> > >> UTSouthwestern > >> > >> Medical Center > >> > >> > >> The future of medicine, today. > >> > >> > >> ------------------------------------------------------------------------ > >> > >> To unsubscribe from the CCP4BB list, click the following link: > >> https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=CCP4BB&A=1 > >> > >> CAUTION: This email originated from outside UTSW. Please be > >> cautious of links or attachments, and validate the sender's email > >> address before replying. > >> > >> > >> ------------------------------------------------------------------------ > >> > >> To unsubscribe from the CCP4BB list, click the following link: > >> https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=CCP4BB&A=1 > >> > > -- > > Dr. Andrea Thorn | group leader > > andrea.th...@uni-wuerzburg.de > > +49 931 31-83677 > > > > Rudolf Virchow Center, University of Wuerzburg > > Josef-Schneider-Str. 2 | 97080 Wuerzburg | Germany > > https://www.uni-wuerzburg.de/en/rvz/research/associated-research-groups/thorn-group/ > > > > ------------------------------------------------------------------------ > > > > To unsubscribe from the CCP4BB list, click the following link: > > https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=CCP4BB&A=1 > > > > > ######################################################################## > > To unsubscribe from the CCP4BB list, click the following link: > https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=CCP4BB&A=1 -- -- Tim Gruene Head of the Centre for X-ray Structure Analysis Faculty of Chemistry University of Vienna Phone: +43-1-4277-70202 GPG Key ID = A46BEE1A ######################################################################## To unsubscribe from the CCP4BB list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=CCP4BB&A=1
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