scholarly journals THE MICRO-ORGANISMS IN PROFILES OF CERTAIN VIRGIN SOILS IN MANITOBA

1935 ◽  
Vol 13c (1) ◽  
pp. 32-46 ◽  
Author(s):  
M. I. Timonin
Keyword(s):  
Organic Matter ◽  
Anaerobic Bacteria ◽  
Hydrogen Ion ◽  
Ion Concentration ◽  
Soil Organisms ◽  
Peat Soils ◽  
Hydrogen Ion Concentration ◽  
Bacteria And Fungi ◽  
Micro Organisms ◽  
Number Of Bacteria

Twelve profiles of five different kinds of virgin soils of Manitoba were sampled, described and critically examined for soil organisms, hydrogen ion concentration and the moisture and organic matter present. Usually the A horizon showed the highest count of each group of micro-organisms and the C horizon the lowest although the greatest number of bacteria were present in the B horizon of boil 1 in the month of May. The proportion of anaerobic bacteria and fungi to total numbers increased with the depth of the horizon. Moisture content of the soil was not found to exert any consistent effect upon the numbers of micro-organisms present. Fungi were most abundant in the wooded and peat soils, bacteria more so in soils of the meadow-prairie phase. In the wooded soils the microbiological horizons appeared to coincide with the morphological horizons.

99. The Effect of the Reaction (PH) of Milk on the Destruction of Micro-Organisms by Heat

1935 ◽  
Vol 6 (2) ◽  
pp. 125-129 ◽  
Author(s):  
A. T. R. Mattick ◽  
A. A. Nichols
Keyword(s):  
Hydrogen Ion ◽  
Ion Concentration ◽  
Hydrogen Ion Concentration ◽  
Micro Organisms ◽  
Number Of Bacteria

It has been shown that alterations in the hydrogen-ion concentration of milk result in differences in the numbers of bacteria which survive the process of heating at 145° F. for 30 min. As the pH decreases the number of bacteria surviving also decreases. The possible bearings of these findings on various processes are discussed.

THE ESTIMATED NUMBER OF NEMAS IN THE SOILS OF MANITOBA

1934 ◽  
Vol 11 (5) ◽  
pp. 594-601
Author(s):  
E. H. J. Marchant
Keyword(s):  
United States ◽  
Organic Matter ◽  
Organic Matter Content ◽  
The United States ◽  
Matter Content ◽  
Hydrogen Ion ◽  
Ion Concentration ◽  
Hydrogen Ion Concentration ◽  
Number Of Species ◽  
Moisture Equivalent

Samples of soil, taken from 29 different sections of the arable portions of Manitoba, have been analyzed. Twelve species of eight genera of nematodes have been identified. No species of the genus Heterodera were found.An endeavor has been made, first, to determine the approximate degree of infestation, and second, to correlate such factors as hydrogen ion concentration, moisture equivalent, and organic matter content with the nema counts.The nematode population is somewhat higher in the soils of Manitoba than in those of many parts of the United States, but considerably lower than in those of North China.The number of species seems to be limited.The degree of infestation appears to be negatively affected by either hydrogen ion concentration or moisture equivalent, but is decidedly influenced by organic matter content.

scholarly journals Preliminary Observations on the Relative Importance of the various Factors Responsible for the Death of Fishes in Polluted Waters

1927 ◽  
Vol 14 (3) ◽  
pp. 729-739 ◽  
Author(s):  
Hem Singh Pruthi
Keyword(s):  
Organic Matter ◽  
Oxygen Content ◽  
Hydrogen Ion ◽  
Ion Concentration ◽  
Relative Importance ◽  
Present Communication ◽  
Straightforward Manner ◽  
Hydrogen Ion Concentration ◽  
The Subject ◽  
Polluted Waters

With the growth of modern, industry the problem of the influence of polluted waters on the bionomics of fishes is becoming very important. Fortunately, biologists anticipated this and many works on the subject have appeared, especially during the last twenty-five years. The polluting substances can be divided into two main classes, namely, (i) those that are directly poisonous to organisms, e.g. gas liquor, sulphites, oils, etc., and (ii) those that give rise to poisonous substances or otherwise make the water undesirable after putrefying, e.g. organic matter in solution and the decomposing bodies of plants and animals. The substances in the first category act in a relatively straightforward manner, and numerous investigators have studied them from several aspects (Shelford, '17; Matthews, '04; Powers, Wells, '15, etc.); it is with regard to those in the second class that many questions are yet unsettled and the present communication deals. We roughly know that the effect of the putrefying substances is to increase the hydrogen ion concentration and decrease the oxygen content of water. It has also been suggested that the byproducts of putrefaction themselves may be poisonous to animals.

The influence of hydrogen-ion concentration on the decomposition of soil Organic matter by hydrogen peroxide (With two text-figures.)

1932 ◽  
Vol 22 (1) ◽  
pp. 92-100 ◽  
Author(s):  
J. S. Hosking
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Matter ◽  
Acid Soils ◽  
Clay Content ◽  
Hydrogen Ion ◽  
Ion Concentration ◽  
Soil Reaction ◽  
Definite Function ◽  
Alkaline Soils ◽  
Hydrogen Ion Concentration

The decomposition of the organic matter of the soil by means of hydrogen peroxide is shown to be a function of the hydrogen-ion concentration of the soil, alkaline soils permitting of a very low degree of oxidation, while with acid soils up to 90 per cent, of the organic matter is destroyed.The results obtained with a range of soils suggest that a portion of the organic matter is oxidised irrespective of the soil reaction, while the oxidation of the remainder is a definite function of the hydrogen-ion concentration, the relation being expressed by the equationThe proportion of the organic matter oxidised further appears to be a definite function of the clay content of the soil. Alkaline soils containing free manganese dioxide also show small losses.

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