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In field screening tests made during 1968 and 1969 to evaluate control of Ostrinia nubilalis (Hubner), the following chemicals were as effective or more effective than DDT used at a rate of 1.00 lb/acre (pounds per acre in parentheses): diazinon (1.00); Stauffer R-15022 ( O -ethyl ethylphosphonothioate. O -ester with p -hydroxybenzaldehyde O -[ ( O -chlorophenyl) carbamoyl]oxime) (0.25 and 0.50) ; monocrotophos (0.50 and 0.75) ; dichrotophos (0.50 and 0.75) : Pennwalt TD-5032 (hexamethylditin) (0.50 and 0.75); phorate (1.00); Bay 68138 (ethyl 4-(methylthio)- m -tolyl isopropylphosphoramidate) (1.00 and 1.50) ; Chevron 5305 ( m-sec- butylphenyl methylcarbamate) (0.75); Chevron 9006 ( O,S -dimethyl phosphoramidothioate) (0.50 and 1.00) ; a mixture of Chevron 9006 + Chevron 5305 (0.75 + 0.75); carbaryl (1.50); EPN ( O -ethyl O -( p -nitrophenyl) phenylphosphonothioate) (0.25). Velsicol VSC-506 (0-(4-bromo-2,5-dichlorophenyl)0-methyl phenylphosphonothioate) (0.75 and 1.50); TDE (1.00 and 1.50); Perthane® (1.I-dichloro-2,2-bis(p-ethylphenyl)ethane) (1.00 and 1.50); Bay 75546 (0-(3-bromo-.5,7-dimcthylpyrazolyl [1,5-a]pyrimidin-2-yl) O,O -diethyl phosphorothioate) (0.50 and 1.00); Bay 79845 ( O -(3-chloro-5,7-dimcthylpyrazolo [1,5-a]pyrimidin-2-yl) O,O -diethyl phosphorothioate) (0.50 and 1.00); Cartap® (S,S'-[2-(dimethylamino) trim ethylene] thiocarbamate hydrochloride) (0.25 and 0.50) ; CIBA 2307 (dimethylphosphate ester with ( E )-3-hydroxy-N-methoxy-N-methylcrotonamide) (0.25, 0.50, and 0.75); a mixture of phorate + Zinophos® ( O,O -diethyl O -pyrazinyl phosphorothioate) (1.00); carbofuran (0.25, 0.50, and 1.00); Mocap® ( O -ethyl S,S -dipropyl phosphorodithioate) (0.75 and 1.00); propoxur (1.00); Landrin® (4: 1 mixture of 3,4,5-and 2,3,5-trimethylphenyl methylcarbamate) (0.75 and 1.00); Bay 93820 (isopropyl salicylate O -ester with O -methyl phosphoroamidothioate) (1.00); Hercules 17413 ( O,O -dimethyl phosphorodithioate S -ester with 3-(mercaptomethyl)-I-methylhydantoin) (1.00); and Bay 91273 (isopropyl salicylate O -ester with O -ethyl phosphoroamidothioate) (1.00).

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is unaltered by any infinitesimal transformation of a certain group of the tenth order, and that all stuch transformations which leave the equation unaltered are contained in the above group. It is at once evident that any equation which by a point transformation can be reduced to the above formi will also be unaltered by the transformatiolns of a group of the tenth order of like composition with the above. In the present paper a more general proposition is considered, viz., the form to which linear partial differential equations, of the second order in three independent variables, can be reduced which have the property of beinlg unaltered for some infinitesimal transformations. Such equations form a class by themselves, the potential equation above and equations redulcible to it by point transformation being only particular types of this class; it is here shown that the infinitesimal transformations which leave unaltered the equations of this class form in all cases a finite group of the eleventh order at highest; and certain types are tabulated to which all equations of the class may be reduced.

When five varieties of virus-free potatoes were introduced and multiplied for three years at an elite seed farm in Prince Edward Island where virus-infected potatoes were also grown, approximatly 10% of each variety became infected with both potato virs S (PVS) and potato virus X (PVX). However, when eight varieties of similar stocks were multiplied for 2 years at private farms in the absence of virus-infected potatoes, all remained free from PVX. Four of the varieties also remained free from PVS and four became infected with amounts of less than 5%. In other tests on these stocks, no potato virus Y (PVY) was detected. Post harvest tuber testing onNicotiana debneyi Domin. was found to be more reliable in detecting recent infections of PVS than foliage tests done during the growing season. This was so whether the foliage tests were done on the indicator plant, serologically or doubly-tested by both methods.

We have measured the transverse momentum distribution (pt) of the pions produced in the BNL 80″ liquid hydrogen bubble chamber. The bubble chamber was exposed to a 7.0 GeV/c negative ipon beam. We have measured 1000 two prong and 2000 six prong events. The pt distribution for low multiplicity events represents production process via peripheral interactions whereas most of the high multiplicity events may correspond to collisions with large four momentum transfer to the nucleon. The p1 distribution of the pions has been fitted with an expression in the Hagedorn model forp,. The effective temperature obtained from a least square fit of the pion pt distribution for the two and six prong events is 132 ± 9 and 120 ± 3 MeV respectively. If we are justified in analyzing the pt distribution of the low multiplicity events with the Hagedorn model, we find that there is no significant difference in the temperature of the 'peripheral' and 'central' region of the interaction volume. The temperature increases with an increase in the energy of the interaction.

We have measuredpt andpi spectra of the pions and protons produced in six- and two-prong interactions in a bubble-chamber experiment. The BNL 80 in, liquid-hydrogen bubble chamber was exposed to a 7.0 GeV/c negative-pion beam. The data are analysed in terms of the Hagedorn model and the two-temperature model of Wayland and Bowen. The temperature of the interaction volume obtained from fitting thept spectra of the pions is below 140 MeV, and for the protons it is close to 180 MeV. Thept spectra of the pions yields a good fit to an expression given in the two-temperature model. We have divided our six-prong data into peripheral and nonperipheral events and the temperature values of the two samples show considerable difference for the protonpt distributions. We have gathered data from the other experiments at different energies. We find that the temperature increases with the rise in incident-particle energy, and it decreases as the multiplicity of the pions produced increases at a fixed incident energy.

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In recent years, large amounts of liquefied gases such as oxygen and hydrogen have been used for steelmaking and for rocket and missile propellants. Structural components which contain these liquids must often withstand high stresses at extremely low temperatures. To obtain design data for structures which will be exposed to these liquefied gases, it is necessary to evaluate the likely candidate materials at operating temperatures. Aluminum with its favorable face-centered-cubic structure has good possibilities in this field. Cryogenic properties of certain aluminum alloys have recently been determined [1–6], However, little work has been done comparing the various 5000-series alloys, especially at temperatures as low as -423°F, and almost no work has been done in evaluating plate material which could be used in construction of large storage containers for the low-temperature liquefied gases.

New technical developments in the cryogenic field have been responsible for the continually increasing use of liquid helium, which provides the lowest possible temperatures. One class of aluminum alloys, the 5000 series, has been shown to have promise as a structural material for use at temperatures as low as -423°F[1,2], However, there are at present only limited data on any of the aluminum alloys, particularly plate, at the temperature of liquid helium (-452°F).

On the basis of the information available, steels(ferritic, martensitic, and bainitic), nickel-base alloys, and titanium alloys become embrittled in pure-hydrogen-gas environments at ambient temperature. The embrittling effect is detected by making tension tests on sharp-notched specimens in an environment of high-purity hydrogen gas and, for comparison, tests on similar specimens in an inert gas at the same temperature and pressure. If the material is embrittled by hydrogen, its notch tensile strength will be reduced. The effect is more pronounced as the hydrogen-gas pressure is increased, but in some cases the embrittling effect has been observed at 1 atmosphere of pressure. The effect is more pronounced for the high-strength steels and high-strength nickel and titanium alloys than for the low-strength alloys. In unnotched specimens exposed to a pure-hydrogen environmental, hydrogen embrittlement manifiests itself as a decrease in ductility. Results of tests on stable austenitic stainless steels such as Types 310 and 316, or certain aluminum alloys such as 6061-T6, 2219-T6, and 7075-T73, and beryllium copper indicate that there is no significant evidence of embrittlement of these alloys in hydrogen gas at pressures up to 10,000psi.

Campbell, Jack E. (University of California, Berkeley), and R. L. Dimmick. Effect of 3% hydrogen peroxide on the viability of Serratia marcescens. J. Bacteriol. 91:925-929. 1966.-Populations of Serratia marcescens were exposed to 3% H(2)O(2) at temperatures from 0 to 20 C. The reaction appeared to follow an Arrhenius plot, but variable numbers of diminutive colonies were found after cell numbers started to decrease. Colony numbers varied on different sampling media and increased when additional incubation was imposed. The overall reaction was sensitive to age of culture, and growth capabilities of treated samples varied with time of treatment, especially during times when no loss of viability was noted. Catalase activity per cell did not correlate with changes in sensitivity; iron added to growth medium increased catalase activity and decreased sensitivity, but not in the same manner. Although the fundamental reaction is presumably molecular in nature, present methods of viability assay measure more than single events and are not suitable for these studies.

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Shot Wrangell was a 1500-foot balloon shot sponsored by LRL and detonated on 22 October 1958 in Area B-Fa of the Nevada Test Site at 0850 PST. The fireball yield was 6?. 3 tons + 5. 0 tons. Photographic coverage of fireball growth was provided by four high-speed Eastman cameras, two each at Station P-362 (6 x 6 No. 2) and Station F-369 (6 x 6 No. 3). In addition, two Rapatronic cameras were located at each of these stations to record early fireball growth. Three Eastman cameras and three Rapatronics provided good records. The remaining Eastman and Rapatronic, because of malfunctions, did not provide records suftable for analysis. The Station locations, together with the burst location, are shown in Figure 1. Figure 2 contains the Survey Data.

Serological studies on the immunogenic properties of biphenyl bridge conjugates of paralytic shellfish poison and protein (PSP-azo-biphenyl- azoovalbumin) indicate that antibodies produced by rabbits were directed against the protein portion of the molecule and that the PSP moiety did not possess haptenic properties. A method of coupling PSP to protein in an acid media through the intermediate action of formaldehyde is also described. Evidence is presented which suggests that the PSP is only slightly altered in this synthesis.