Frederick P. Thurberg  Ries S. Collier 《Marine pollution bulletin》1977,8(2):40-41

Cunners, a common inshore teleost fish of the north-east coast of the United States, were exposed to various concentrations of silver for 96 h. At the end of this exposure period measurements of gill-tissue oxygen consumption were made. Significant respiratory depression was noted after exposure to concentrations as low as 0.12 ppm. These results are compared to those of similar studies using cadmium and mercury as the test metals.  相似文献   

    

D. J. Stom  S. S. Timofeeva  N. F. Kashina  L. J. Bielykh  S. N. Souslov  V. V. Boutoeov  M. S. Apartzin 《洁净——土壤、空气、水》1980,8(3):223-230

In two test series, for which 10 and 2 … 4 g/1 wet matter of higher and lower aquatic plants from the lake Baikal and from the waters in the surroundings of Irkutsk were used, phenol solutions having concentrations of 10^?3 … 10^?5 M (1 … 5 mg/1) were applied. During the investigations the possible error clue to the presence of microorganisms was eliminated. The phenol decomposition by aquatic plants proceeds as a first-order reaction. The results of analyses are summarized in several tables and graphical representations.  相似文献   

    

D. J. Stom  S. S. Timofeeva  N. F. Kashina  L. J. Bielykh  S. X. Souslov  V. V. Boutokov  M. S. Apartzin 《洁净——土壤、空气、水》1980,8(3):213-221

After an outline of the possibilities and difficulties connected with the polarographic determination of aqueous quinone solutions, a specified oscillo-polarographic method of investigation is described. By the examples of solutions of pure substances as well as of the industrial waters of a pulp mill (up to 2.3 mg/1 total quinone) the conditions for applying the technique developed art' explained. The relative error of this method does not exceed 3%  相似文献   

    

D. J. Stom  S. S. Timofeeva  N. F. Kashina  L. J. Bielykh  S. N. Souslov  V. V. Boutorov  M. S. Apartzin 《洁净——土壤、空气、水》1980,8(3):203-211

By the example of some phenols and qninones, in aqueous solutions possibilities for the quantitative determination are tested separately and in the mixture. Methods for thin-layer chromatography and spectrophotometry were developed. There can be chromatographically deteeted between 5 and 80 μg of substance. Phenol and quinone concentrations of 1.5 · 10^?3 … 0.5 · 10^?4 M were spectrophotometrically investigated.  相似文献   

    

S. N. Pandey  J. Chattopadhyay 《Pure and Applied Geophysics》1979,117(5):865-873

The various forms of energy and energy conversions have been computed over a part of the Indian region during an active monsoon period, using the quasigeostrophic baroclinic model. The energetics of the monsoon depression have been discussed on the basis of these results.  相似文献   

    

T.G. Varghese  F. Roy  B.S.S. Rao  M.P. Suryavanshi  R.N. Bharthur 《Physics of the Earth and Planetary Interiors》1979,18(2):87-94

The medium-aperture array at Gauribidanur is in continous operation since 1966. With the recent addition of a 12-bit 16-K computer its potential for the monitoring of underground explosions has improved considerably. The salient aspects of the monitoring system, the present and projected procedures for generation and dissemination of detection data and the long-term storage of data relevant to discrimination research are discussed. An attempt is also made to assess its detection efficiency in the light of the major features of site noise.  相似文献   

    

B. S. RATHOR 《Geophysical Prospecting》1978,26(3):550-561

Expressions for the I. P. activity coefficient for an inhomogeneous sphere with the conductivity increasing/decreasing from the core towards the periphery according to a power law have been derived. In certain geometrical situations of the electrode configurations a negative I. P. signal is obtained. The negative I. P. may be understood as due to modifications in the discharge current from the polarized medium during the discharge process. The results of the investigation may be useful for more accurate interpretation of I. P. anomalies due to isometric inhomogeneous bodies.  相似文献   

    

B. S. RATHOR 《Geophysical Prospecting》1978,26(2):337-351

In this paper, the expressions for the induced voltage function V(T) and mutual impedance function Z_m(T) have been derived for specific range of time T and specific values of induced polarization parameters a for ramp and saw-tooth type of current pulses. The computed results for various cases are also presented. The low values of induced polarization parameter a represent the medium possessing membrane polarization, whereas high values exhibit electrode polarization medium. The method has practical applicability and is best suited for the interpretation of transient electromagnetic fields over a polarizable half-space.  相似文献   

    

R.S.R. Fitter 《Marine pollution bulletin》1978,9(7):173-175

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H. S. Pandey  R. P. Singh 《洁净——土壤、空气、水》1980,8(6):583-589

Protein digestibility was determined via two feeding trials in glass aquaria by the indicator (Chromium oxide) method using a mixture of shrimp powder with oil cake and wheat bran respectively (1: 1 W/W) as food. Analyses of feed were made to calculate the crude protein, carbohydrate, lipid and ash contents. Feces were analysed to determine their total nitrogen and chromium oxide. Protein digestibility was studied in relation to salinity of the medium size and weight of the fish body. The apparent digestibility of crude protein of a corresponding die has shown that 1st: Younger fish do possess a lower capability of protein digestion than fish having a medium weight and medium size; 2nd: Older fish with a high weight and large size exhibit no improvement in efficiency to digest the food protein, though their weight and size are significantly greater than those of middle weight and medium size fish; 3rd: The replacement of oil cake by wheat bran decreases the protein digestibility of shrimp powder mixture with them; 4th: A salinity (NaCl) of the aquatic medium at or above 3 g/l depletes the protein digestibility when fish of the same size were experimented with; but a salinity up to 2 g/l does not result in a significant decrease in the protein digestion rate.  相似文献