A FORTRAN-based list processor for Poisson series

1970 ◽  
Vol 2 (4) ◽  
pp. 474-480 ◽  
Author(s):  
W. H. Jefferys
Keyword(s):  
Poisson Series

scholarly journals Processing Poisson series in parallel

1990 ◽  
Vol 10 (2) ◽  
pp. 179-201 ◽  
Author(s):  
André Deprit ◽  
Etienne Deprit
Keyword(s):  
Poisson Series

Solving problems symbolically by using Poisson Series Processors

1999 ◽  
Vol 33 (3) ◽  
pp. 18-19
Author(s):  
J. F. San Juan ◽  
A. Abad ◽  
S. Serrano ◽  
A. Gavín
Keyword(s):  
Poisson Series

An improved algorithm to compute circular functions of Poisson series

2007 ◽  
Vol 99 (1) ◽  
pp. 59-68 ◽  
Author(s):  
María del Carmen Martínez ◽  
Juan F. Navarro ◽  
José Manuel Ferrándiz
Keyword(s):  
Poisson Series ◽  
Circular Functions ◽  
Improved Algorithm

Automated Computation of General Perturbations for the Flora Asteroidal Group

1991 ◽  
Vol 9 (1) ◽  
pp. 149-149
Author(s):  
M. F. He ◽  
Zhangjie
Keyword(s):  
Group Method ◽  
Poisson Series ◽  
The Mean ◽  
Series Processor

AbstractThe general perturbations of the asteroids of the Flora group (975″ < n < 1150″, n - the mean daily motion) due to Jupiter have been automatically computed on an IBM 4341 computer with the Hansen method by manipulating Broucke’s Symbolic Poisson Series Processor, and the results have been compared with that computed previously with the Bohlin group method.

scholarly journals Comparative detection of coliform organisms in milk and water by the presumptive coliform test

1943 ◽  
Vol 43 (2) ◽  
pp. 129-135 ◽  
Author(s):  
H. Barkworth ◽  
J. O. Irwin
Keyword(s):  
Lactic Acid ◽  
Lactic Acid Bacteria ◽  
Small Proportion ◽  
Present Experiment ◽  
False Negative ◽  
Poisson Series ◽  
Milk Samples ◽  
Physico Chemical ◽  
Chemical Constitution ◽  
Fermentation Test

It has been shown (Barkworth & Irwin, 1938) that the distribution of coliform organisms in milk follows a Poisson series, and on this basis it should be possible to estimate the population from the results of replicate tests at several dilution levels by reference to tables. In later experiments with water (Barkworth & Irwin, 1941), it was found that the number of positive tubes did not always reach expectation, having regard to the known numbers of organisms inoculated. The peculiar physico-chemical constitution of milk naturally raises the question whether coliform organisms, though present, might fail to give a positive reaction in the presumptive test. It is well known that in favourable circumstances lactic acid bacteria will overgrow all other organisms in milk. In the presumptive test the greatest concentration of milk in routine technique is 1 ml. of milk in 5 ml. of medium. This dilution would not affect the ratio of coliform organisms to lactic acid bacteria. Even when the coliform contamination at the time of testing is ‘present in 0·001 ml.’ the agreement with the fermentation test is only about 50% (Barkworth, 1929). It will be argued that the gas tube would disclose the presence of gas in more cases than the fermentation test, nevertheless it is not perfect, for Chalmers (1928) recovered Bact. coli from plates of 1: 10 dilution of samples of milk which had given a negative presumptive test. There is therefore some reason to expect a small proportion of false negative coliform results to occur with milk samples, and the object of the present experiment was to see if inoculation with a known number of organisms would produce similar numbers of positive tubes in milk and in water.

THE ACCURACY OF THE PLATING METHOD FOR ESTIMATING THE NUMBERS OF SOIL BACTERIA, ACTINOMYCES, AND FUNGI IN THE DILUTION PLATED

1939 ◽  
Vol 17c (3) ◽  
pp. 72-86 ◽  
Author(s):  
Norman James ◽  
Marjorie L. Sutherland
Keyword(s):  
Bacterial Population ◽  
Accurate Estimate ◽  
Poisson Series ◽  
Plating Method ◽  
Successive Period ◽  
The Mean ◽  
Data Yield ◽  
Micro Organisms ◽  
Abnormal Variation ◽  
Number Of Bacteria

During the crop seasons of 1936, 1937, and 1938, 1465 samples of field soil, held in the laboratory one day after crushing, were plated by the recognized technique in four replicates of one dilution for counts of fungi, and of a higher dilution for counts of bacteria and of actinomyces. A χ2 value was calculated for each set or counts. These values for each group of micro-organisms were distributed into classes, and the number in each class was compared with the theoretical for the Poisson series. The data for each year indicate that the fungal counts conform to expectancy on the basis of random sampling, and show that the method provides a reasonably accurate estimate of the population in the dilution plated capable of developing under the conditions of growth. Too many sets of counts of bacteria in each year yield high χ2 values. The counts of actinomyces conform to expectancy.In an attempt to determine the cause of this abnormality for sets of counts of bacteria, samples were plated on the afternoon of the day they were taken from the field. Three hundred and four samples plated in six replicates of one dilution, and another 100 samples plated in four replicates, yield χ2 values whose distributions conform to expectancy. Accordingly, the plate method provides a satisfactory estimate of the bacterial population of soil in the dilution plated if the procedure is carried out within six hours after sampling. Data on 88 samples plated on the day of sampling, on 88 samples held one day, on 88 samples held two to five days, and on 88 samples held eight to thirteen days show that the discrepancy between the actual and theoretical distributions of χ2 values becomes progressively greater at each successive period of holding the samples. Further, the data indicate that the area sampled, the season, the medium used and the technique of plating bear no relation to the abnormal variation in counts of bacteria on replicate plates.A record was kept of the presence of abnormal types of bacterial colonies and various genera of fungi on all plates from 468 samples plated one day after sampling and crushing during 1938. The data show that sets having pin-point colonies or spreading colonies of the Mucorales on one or more plates usually have high χ2 values. Counts on such plates should be excluded from the estimate of the mean number of bacteria in the sample. Likewise, the number of actinomyces colonies on each plate from these samples was recorded. The χ2 values for these counts were found to conform to expectancy, indicating that the factor or factors associated with a large number of high χ2 values for counts of bacteria does not affect the count of actinomyces in the same way.Percentage moisture and P values corresponding to χ2 values for the counts of bacteria obtained each year were correlated. The data yield coefficients that are not significant in each case.

scholarly journals Poisson Series and Biological Data

Nature ◽  
1933 ◽  
Vol 132 (3333) ◽  
pp. 445-445
Author(s):  
E. D. VAN REST ◽  
E. A. PARKIN
Keyword(s):  
Biological Data ◽  
Poisson Series
Sign in / Sign up

Export Citation Format

Share Document