From owner-biophysics@net.bio.net Sun Feb 15 22:00:00 1998 From: mmisha@nmr.mgh.harvard.edu (M. Papisov) Newsgroups: bionet.biophysics Subject: Re: Magnetic affect on growth Date: Mon, 16 Feb 1998 12:29:11 -0500 Organization: MGH & HMS Lines: 76 Message-ID: References: <34E72248.38C@virgin.net> NNTP-Posting-Host: misha.mgh.harvard.edu Path: biosci!agate!howland.erols.net!cpk-news-hub1.bbnplanet.com!news.bbnplanet.com!baron.netcom.net.uk!netcom.net.uk!newsfeed.wizvax.net!news.mv.net!newspump.wustl.edu!news.fas.harvard.edu!oitnews.harvard.edu!hpngsv01.mgh.harvard.edu!misha.mgh.harvard.edu!user In article <34E72248.38C@virgin.net>, alan.loberto@virgin.net wrote: > I have a dying question and that is; > "Will a magnetic field have an affect on Bacterial growth?" > I would be very grateful if one would reply via e-mail to > alan.loberto@virgin.net I personally have no idea, but because it's a "dying question", here is a couple of references: 1 AN 81247674 AU Aarholt E. Flinn EA. Smith CW. TI Effects of low-frequency *magnetic* fields on *bacterial* *growth* rate. SO Physics in Medicine & Biology. 26(4):613-21, 1981 Jul. JC p6j CP England AB A large number of cultures of the bacterium E. coli have been grown in weak alternating *magnetic* fields of square waveform, at frequencies of 50 Hz and 16.66 Hz. Control cultures were simultaneously grown under ambient conditions identical except for the almost complete absence of any *magnetic* *field*. The mean generation time (MGT) for a culture subjected to alternating *magnetic* fields is significantly reduced by comparison with that for the control cultures. Application of the F-ratio test indicates a probability of less than one in two million that the effects observed are due to chance. A marked threshold effect is observed, along with strong indications of periodicity in the graph of MGT against *magnetic* *field* strength. Within the limits of experimental error, these effects correspond to integral changes in the number of *magnetic* flux quanta linking an individual *bacterial* cell during the process of division. DE *Escherichia coli/gd [*Growth* & Development]. *Magnetics. IS 0031-9155 PT Journal Article. LG English EM 8111. 2 AN 87113862 AU Pantev TP. Minkova MI. TI [Direct and mediated action of a permanent *magnetic* *field* on biological objects]. [Russian] TT Priamoe i oposredovannoe deistvie postoiannogo magnitnogo polia na biologicheskie ob''ekty. SO Kosmicheskaia Biologiia i Aviakosmicheskaia Meditsina. 20(6):73-6, 1986 Nov-Dec. JC kxc CP USSR AB The effect of a constant *magnetic* *field* (CMF) of H = 2.3 X 10(5) A/m (2900 Oe) on the viability and radiosensitivity of E. coli B and the effect of magnetically activated water (MAW) on the radioresistance of rats were examined. The exposure did not influence the *growth* kinetics of E. coli B. Cell cultivation in the magnetically pretreated nutrient medium enhanced the *bacterial* *growth*. Preliminary exposure of *bacterial* cells to a CMF for 24 and 48 hrs increased and that for 72 hrs decreased their radioresistance. Twice a day the experimental weanlings were given MAW and the controls--tap water. The postradiation longevity of the MAW rats proved extended as compared to that of the controls. The MAW rats showed a greater osmotic stability of erythrocytes, a higher concentration of nucleic acids, and a larger count of leucocytes. DE Animal. Comparative Study. English Abstract. Escherichia coli/ph [Physiology]. Gamma Rays. *Magnetics. Radiation Dosage. Radiation Tolerance. Rats. Space Flight. Time Factors. Water/pd [Pharmacology]. X-Rays. RN 7732-18-5 (Water). IS 0321-5040 PT Journal Article. LG Russian EM 8705. ______________He who rides on a tiger never dismounts________________ Please delete the very first letter in my email address to reply. Nobody at all, including my past, current and future employers, is responsible for whatever is written above. .