The small negative coupling constant, Jh, in fumaryl fluoride appears to be real. In the calculations it was originally assigned a value of zero. Allowing it to vary to the value listed results in an improved calculated spectrum. To further substantiate this, fumaryl chloride fluoride was prepared and its nmr spectrum analyzed. It is possible to determine the relative signs of the coupling constants from the analysis of this ABX spectrum and indeed «Tax is opposite to Jbx• The parameters are as follows: 5A 6.923 ppm, 7.143 ppm (from TMS), 31.414 ppm (downfield from CFC13) (JAB = ±15.60, JAX = ±7.11, and JBX = =F 0.28 cps). Since the magnitude of the coupling constants here are very nearly the same as those of fumaryl fluoride it is reasonable to assume that the sign J14 is opposite to Ju in fumaryl fluoride.Compound I has been identified solely from its nmr spectrum. This product should not be unexpected since SF4 is reported1 to react with carbonyl groups to give giem-difluoro compounds. The proton and fluorine spectra are consistent with the ABX2 type expected.The parameters are as follows:6.501 ppm, 7.411 ppm (from TMS), -83.5 ppm (upfield from CFCI3) (Jab = 5.7, Jax = 0.8 and J = 0.9 cps).(6) D. F. Koster, unpublished results. (7) K.

No abstract

approximately 320 Army personnel, dependents, civilian employees, and guests at¬ tended a catered banquet in a private hall in San Antonio, Tex. Within a week nearly three-fourths of the diners were ill with what was later shown to be shigellosis (bacillary dysentery) caused by Shigella flexneri J^a. Shigellosis is an infection which frequently is not diagnosed because of the inadequacy or lack of laboratory facilities. The disease is endemic throughout a large part of the United States (1). In epidemic form shigel¬ losis has been less common than salmonellosis; explosive outbreaks have been reported infrequently. Usually protracted intra-institutional spread of the Shigella precedes the epidemic, which lasts weeks or months. Numerous rela¬ tively brief epidemics with high incidence also have been reported. Green and McLeod (2) described an outbreak of 400 cases in a small town of 10,000 population in England in 1942. Two hundred of these cases occurred within a 6-day period; the entire epidemic lasted 1 month. The medium of Dr.

Effects of ultra high speed (UHS) floor burnishing upon air quality in health care facilities were evaluated. A 2,000-rpm burnisher can disseminate high-velocity (190 km/hr) dust and microbial particles. A UHS burnisher used with either inadequate or no air restraint produced significant increases (P less than 0.05) in the levels of airborne dust particles and microorganisms. A UHS burnisher equipped with an air restraint assembly specifically designed for use in health care facilities produced no significant increase (P greater than 0.05) in the levels of airborne dust particles or microorganisms when compared to ambient air levels. The types and distribution of airborne microorganisms isolated from microbial air samples were not unusual nor were they directly influenced by the floor burnishing processes. Furthermore, the UHS floor burnishing process produced a significant reduction (P less than 0.05) in microbial floor contaminants (96%). When the use of UHS floor burnishing is contemplated for productivity improvement and esthetic enhancement, the possible adverse effects on air quality should also be considered.