Multi-Block Data Modeling for Characterization of Soil Contamination: A Case Study     

Kunwar P. Singh  Amrita Malik  Sarita Sinha  Vinod K. Singh 《Water, air, and soil pollution》2007,185(1-4):79-93

Multi-block (heavy metals, pesticides, physico-chemical parameters) data set pertaining to the soils of alluvium region in Indo-Gangetic plains was analyzed using principal component analysis (PCA) and multiple factor analysis (MFA) methods to delineate the contaminated sites and to identify the possible contamination sources in the study region. In normal PCA, the first three factors were dominated mainly by heavy metals, pesticides and physico-chemical variables, respectively, thus identifying samples/sites contaminated with these. The MFA results, due to its unique weighting scheme of variables of different blocks extracted, to more realistic information about the spatial distribution of samples and relationships among the variables. MFA minimized the influence of variables of one single block on the first few components, allowing variables of all blocks equally to share the common MFA space. This resulted in delineating the sites/regions contaminated with variables (Al, Co, Cu, Mn, Ni, Pb, V, Na, SO₄, aldrin, lindane, HCB, HCH, DDT, and endosulfan) of all the blocks, rather than by particular block variables as in case of normal PCA, where, the variables of single block dominate the first factors, suppressing other block variables. MFA which can be considered as a method for standardization of the multi-block variables was successfully applied to the three block data set of soils.  相似文献   

Effects of heating and freezing on the viability of sarcocysts of Sarcocystis levinei from cardiac tissues of buffaloes     

P S Srivastava  A K Saha  S R Sinha 《Veterinary parasitology》1986,19(3-4):329-332

Dogs fed buffalo heart muscle containing sarcocysts of Sarcosystis levinei and heated at 65-75 degrees C did not shed sporocysts, whereas other dogs fed infected heart muscle heated between 40 and 60 degrees C shed sporocysts. Dogs fed infected heart muscle stored at -4 degrees C for 48 h did not shed sporocysts, but those fed similar infected tissues stored at -2 degrees C for 24 h shed sporocysts. The results indicate that sarcocysts of S. levinei are rendered noninfective by heating to 65 degrees C or by freezing at -4 degrees C.  相似文献   

Meningioma in a dog     

D P Sinha  K K Keahey  R G Schirmer 《The Cornell veterinarian》1971,61(2):253-257

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The migratory behaviour of the larvae of Ascaris lumbricoides (Linnaeus, 1758) in white mice     

B N Sinha 《The Indian veterinary journal》1967,44(4):292-297

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Observations on the incidence and pathology of natural lungworm infection in pigs (Sus Scrofa Domestica) in Bihar     

B K Sinha 《The Indian veterinary journal》1967,44(10):884-888

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Study on blood picture in a clinical case of traumatic pericarditis in a buffalo     

G K Sinha 《The Indian veterinary journal》1967,44(8):670-672

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Agronomic Performance of Wheat (Triticum aestivum L.) as Influenced by Moisture Stress at Various Growth Stages and Seeding Rate     

U. A. Hassan    V. B. Ogunlela  T. D. Sinha 《Journal of Agronomy and Crop Science》1987,158(3):172-180

A field experiment was conducted at Samaru, Nigeria during the 1981–82 dry season to determine the yield and growth responses of wheat ( Triticum aestivum L.) to moisture stress imposed at various growth stages and to seeding rate. It was also to identify wheat growth stages that are most sensitive to soil moisture stress. Treatments tested include three seeding rates, namely, 75, 100 and 150 kg per ha, and seven drought treatments, effected by missing one or two consecutive irrigations at different growth stages.
Withholding irrigation at any growth stage prior to anthesis had detrimental effects on most of the growth characters and stress during crown root initiation (CRI) and jointing reduced most of the yield characters. Missing two consecutive irrigations at any given growth stage reduced grain yield more than did missing one irrigation; the greatest reductions in grain yield were 13 and 65% when one irrigation was missed at CRI and two consecutive irrigations were missed at jointing (the most sensitive growth stage) respectively. Moisture stress was also detrimental to number of grains, spike number, spike length, leaf area and number of tillers. A seeding rate of 100 kg per ha produced the best wheat performance in the present study.  相似文献   

Ureteral reflux in the squirrel monkey (Saimiri sciureus)     

D P Sinha  T B Clarkson 《American journal of veterinary research》1971,32(6):975-978

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Penetration rate of chilled and frozen sperms from Jersey bulls and levels of certain electrolytes in the oestrous mucus of cows     

Y Kumar  S N Sinha  M H Akhtar 《The British veterinary journal》1983,139(5):452-455

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Effect of Seed Pre-sowing Hardening on Physiological Behaviour and Seed Yield of Berseem (Trifolium alexandrinum L.) Crop     

N. C. Sinha  R. P. Singh 《Journal of Agronomy and Crop Science》1987,158(3):181-186

A field experiment was conducted at Central Research Farm, Indian Grassland and Fodder Research Institute, Jhansi to study the effect of seed pre-sowing hardening on seed emergence, physiological behaviour — and seed yield of berseem ( Trifolium alexandrinum L. Var. S-99-1) crop. For this purpose, seed pre-sowing hardening were made by soaking of seeds in tap water for 24 and 36 hours separately and later dried back to their original weight or left undried. These seeds were sown at two depths (5 and 3 cm) and judged against control (no soaking). Results demonstrated that augmented effect of seed hardening on seed emergence and physiological process responsible for seed yield was recorded in descending order of harden seeds (of 24 hours soaking) > non harden seeds (of 24 hours soaking) > harden seeds (of 36 hours soaking); while non-harden seeds of 36 hours soaking adversely affect the plant growth because of leaching of sugar during excess soaking — an element for reduced seed vigour potential. Seed hardening system developed the strength of seed emergence on account of efficient catabolic process releasing high water soluble sugars needed for efficient germination process. Further this process augmented the absorption mechanism of mineral nutrients (particularly phosphorus and nitrogen with marginal variation in calcium) was quite evident at bloom stage — indicating a high metabolic activity during this period. Performance of seed hardening was effective at 5 cm deep sowing.  相似文献