A study of Holocene floodplain particle size characteristics with special reference to palaeochannel infills from the upper Severn basin, Wales, UK

2001 ◽  
Vol 36 (2) ◽  
pp. 143-157 ◽  
Author(s):  
Mark Patrick Taylor ◽  
Paul A. Brewer
Keyword(s):  
Particle Size ◽  
Special Reference

Analytical assessment of Akika Pishti based on Ancient and Modern Parameter

2017 ◽  
Vol 2 (3) ◽  
Author(s):  
Vidyashree Vidyashree ◽  
Gowda Shankar ◽  
Doddamani M. S.
Keyword(s):  
Particle Size ◽  
Quality Control ◽  
Special Reference ◽  
Therapeutic Efficacy ◽  
Direct Reference ◽  
Instrumental Analysis ◽  
Ancient Text ◽  
Particle Level ◽  
Analytical Assessment

Pishti Kalpana is one of the Kharaliya Kalpanas of Rasashastra which brings the heat sensitive substances to micro particle level without applying the heat for better therapeutic efficacy and is considered as Sukshma as Bhasma. In Rasa texts it is said that Marana of Ratna and Uparatna are not worthwhile hence, Pishti Kalpana is advocated. There is no direct reference for the Siddhilakshana of Pishti, but our Acharyas has mentioned that Pishti is a Anagnisidhdha Bhasma i.e. Pishti should be Bhasmavat, so the parameters mentioned for quality control of Bhasma in ancient text are applicable for assessing the Siddhi Lakshanas of Pishti. So an attempt has been made to study analytically Sidddhilaxana of Pishti by both ancient and modern parameters with special reference to Akika Pishti. Akika is one of the semiprecious gems grouped under the Paradadi Varga, Uparatna Varga and Spatika Varga Ratna. In present study Pishti was prepared as per pharmacopeal standards and subjected to both ancient and modern tests to analyze them viz. Pishtivarna, Mrudutva and Slakshanatva, Rekhapurnata, Varitara, Nirdhooma, Unama and Nischandratva tests according to classics and according to modern parameters, organoleptic tests, physio chemical like LOD, pH, ash values, instrumental analysis like XRD , SEM-EDAX and particle size.

Two Electivity Indices for Feeding with Special Reference to Zooplankton Grazing

1979 ◽  
Vol 36 (4) ◽  
pp. 362-365 ◽  
Author(s):  
H. A. Vanderploeg ◽  
D. Scavia
Keyword(s):  
Particle Size ◽  
Special Reference ◽  
Selectivity Coefficient ◽  
Size Spectrum ◽  
Zooplankton Grazing ◽  
Predator Prey ◽  
Electivity Index ◽  
Size Selection ◽  
Prey Interaction ◽  
Selection For

The electivity indices Ei and Ei′ of predator–prey interaction are currently used to quantify particle-size selection by grazers. Under conditions of passive, mechanical particle-size selection predicted by the leaky-sieve model, these indices yield electivity vs. particle-size curves that vary with the shape of the particle-size spectrum of food offered to the zooplankton. In addition to this bias, poor estimates of electivity will be obtained unless only a small fraction of the food is eaten in such experiments. The selectivity coefficient (Wi) used by modelers in feeding constructs and the electivity index Ei*, derived here, are recommended instead because they do not suffer from the shortcomings described for Ei and Ei′. Moreover, use of Wi′s and Ei*'s is recommended for quantifying selection for many other cases of predator–prey interaction. Key words: electivity indices, selectivity, selective grazing, predator–prey intraction

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