Survivality and Impaired Growth in Arsenic Treated Fingerlings of Channa punctatus,a Fresh Water Murrel     

J. P. Shukla  K. N. Shukla  U. N. Dwivedi 《洁净——土壤、空气、水》1987,15(3):307-311

The LC₅₀-values of As³⁺-compounds for Channa punctatus are determined for a 48-h exposure to 19.4 (18.02… 21.3) mg/1 and for a 96-h exposure to 14.3 (13.06… 16.80) mg/1. At a long-time exposure to 7.0 mg/1 As³⁺, during the first seven days there does not occur any change of growth, then the growth in length and the increase in weight decreased by 6.6 and 11.7%, respectively, till the 31st day. At the same time, the RNA content of the muscle decreased by 11.5% to 966.7 μg/g fresh weight and the protein content decreased by 12.5 % to 95.39 mg/g fresh weight.  相似文献   

Deleterious effects of Malathion on survivality and growth of the fingerlings of Channa punctatus (BLOCH.), a freshwater murrel     

J. P. Shukla  M. Banerjee  K. Pandey 《洁净——土壤、空气、水》1987,15(6):653-657

The LC₅₀ of Malathion for Channu punctatus is determined for 24… 96 h of exposure as 10.95… 3.22 mg/l. At exposure to 2.5 mg./l Malathion, growth–measured by increase in weight–is significantly reduced from the 19th day and reduced by 10 % till the 31st day. During the same period of time, the RNA and protein contents of the muscle is lowered by 10 and 15 %, respectively, as compared with the control. In addition to an acute toxic effect, in sublethal concentrations Malathion has also pronounced effects on growth and metabolism.  相似文献   

An evaluation of the CIC model of210Pb dating of sediments     

B. S. Shukla  S. R. Joshi 《Environmental Geology》1989,14(1):73-76

Both linear and polynomial regression analysis techniques are used to assess the CIC (constant initial concentration) model of²¹⁰Pb dating. Results obtained using published²¹⁰Pb and porosity profiles in 12 freshwater sediment cores show that linear regression affords more reliable results. The polynomial regression, while capable of predicting the values of the constant or derived from porosity data, gives reasonable results only when all the coefficients of the polynomial are of appropriate sign. Lower values for all the parameters are obtained in all cases if the effect of compaction is not considered.  相似文献   

Altered Nucleic Acids Metabolism in the Ovary Exposed under Arsenic Stress in a Fresh-water Fisch,Colisa fasciatus (BL u. SCH.)     

J. P. Shukla  K. Pandey 《洁净——土壤、空气、水》1984,12(2):217-220

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Effect of Aldrin on the Carbohydrate Metabolism of a Freshwater Prawn Macrobrachium lamarrei (H.-M. EDWARDS) Crustacea,Decapoda     

Omkar  R. Murti  G. S. Shukla 《洁净——土壤、空气、水》1984,12(5):549-552

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Acute Toxicity of Mercuric Chloride and Cadmium Chloride to Freshwater Prawn,Macrobrachium lamarrei (H. Milne EDWARDS)     

R. Murti  G. S. Shukla 《洁净——土壤、空气、水》1984,12(6):689-692

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On the stability and evolution of stationary whistler turbulence     

P.K. Shukla 《Planetary and Space Science》1977,25(3):309-310

It is shown that stationary turbulence consisting of an ensemble of small amplitude whistler wave packets becomes unstable against adiabatic perturbations. The rate of increase of the purely growing instability is presented. A stationary non-linear BGK solution for the whistler electric fields is obtained.  相似文献   

Observations of wind and waves in the central Bay of Bengal during BOBMEX-99 and their effect on mixed layer depth variability due to forced mixing     

J. Swain  R. K. Shukla  A. Raghunadha Rao  J. K. Panigrahi  N. R. Venkitachalam 《Journal of Earth System Science》2003,112(2):255-266

Time-series wind and wave measurements were carried out onboard INS Sagardhwani in the central Bay of Bengal during BOBMEX-99. Various other marine meteorological and oceanographic measurements relevant to monsoon studies were also collected simultaneously. The observed variations of wind and waves and the associated mixed layer depth (MLD) variability based on both temperature and density criteria at 3 hourly intervals are presented in this paper as a case study. At the time-series location (13‡N, 87‡E) wind varied between 6 and 16m/s and the predominant direction was southwesterly. The significant wave height and period varied from 1.9 to 3.7m and 8 to 13 s respectively. Some of the available statistical predictive methods for the determination of MLD by forced mixing are utilized to test the extent of mechanical mixing within the top layer of water by the local wind and wave activity. The same is extended to formulate a new empirical relation for gross estimation of effective depth within which the sound energy is generally trapped during its transmission in the surface duct. The present analysis aiming for estimation of observed MLD variability (35 to 75 m) using the suggested simple empirical relation reveals that, the mixed layer variability observed during the experiment depends on both local ocean variability as well as remote forcing as reported earlier.  相似文献   

A receiver function perspective of the Dharwar craton (India) crustal structure   总被引：1，自引：0，他引：1  

Dipankar Sarkar  M. Ravi Kumar  Joachim Saul  Rainer Kind  P. S. Raju  R. K. Chadha  A. K. Shukla 《Geophysical Journal International》2003,154(1):205-211

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Comments on ‘No K/T boundary at Anjar,Gujarat, India: Evidence from magnetic susceptibility and carbon isotopes’     

A. D. Shukla  P. N. Shukla 《Journal of Earth System Science》2002,111(4):489-491

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