Induced spawning of Asian catfish, Clarias batrachus (Linn.): effect of various latency periods and SGnRHa and domperidone doses on spawning performance and egg quality     

Sangram Ketan Sahoo  Shibe Shankar Giri  & Asok Kumar Sahu 《Aquaculture Research》2005,36(13):1273-1278

An experiment was conducted to induce ovulation in Asian catfish, Clarias batrachus, by a single injection of SGnRHa (d ‐Arg⁶, Trp⁷, Leu⁸, Pro⁹, Net) in combination with domperidone. The effects of latency periods, 11, 14, 17, 20 and 23 h, and doses of inducing agent, 10 μg SGnRHa+5 mg domperidone, 20 μg SGnRHa+10 mg domperidone, 30 μg SGnRHa+15 mg domperidone and 40 μg SGnRHa+20 mg domperidone kg^?1 body weight, were studied on the total egg output, stripping response, fertilization, hatching and normal larval production. The highest (P<0.05) number of eggs were stripped at 23 h of post injection of 20 μg SGnRHa+10 mg domperidone kg^?1 female body weight. The highest (P<0.05) stripping response was observed when the females were stripped at 20 and 23 h latency, at all dose levels of the inducing agent. The eggs stripped at 11 h latency did not fertilize, and hence did not hatch irrespective of administration of any dose levels of the inducing agent. The fertilization and hatching per cent of eggs had significantly increased (P<0.05) with increase in latency period to 14–23 h at a dose of 20 μg SGnRHa+10 mg domperidone. The latency period of 14–17 h, and dose of 20 μg SGnRHa+10 mg domperidone and 30 μg SGnRHa+15 mg domperidone kg^?1 of female, was found to be suitable to obtain best spawning performance, and good‐quality egg and larval production in C. batrachus.  相似文献   

Effect of process variables on the quality characteristics of pelleted wheat distiller's dried grains with solubles     

Jaya Shankar Tumuluru  Lope Tabil  Anthony Opoku  Maria Rosario Mosqueda  Olaniyi Fadeyi 《Biosystems Engineering》2010,105(4):466-475

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Use of hyperspectral data to assess the effects of different nitrogen applications on a potato crop   总被引：1，自引：0，他引：1  

Namrata Jain  Shibendu Shankar Ray  J. P. Singh  Sushma Panigrahy 《Precision Agriculture》2007,8(4-5):225-239

This study was conducted to explore whether hyperspectral data could be used to discriminate between the effects of different rates of nitrogen application to a potato crop. The field experiment was carried out in the Central Potato Research Station, Jalandhar, on seven plots with different nitrogen (N) treatments. Spectral reflectance was measured using a 512-channel spectroradiometer with a range of 395–1075 nm on two different dates during crop growth. An optimum number of bands were selected from this range based on band–band r ², principal component analysis and discriminant analysis. The four bands that could discriminate between the rates of N applied were 560, 650, 730, and 760 nm. An ANOVA analysis of several narrow-band indices calculated from the reflectance values showed the indices that were able to differentiate best between the different rates of N application. These were reflectance ratio at the red edge (R_740/720) and the structure insensitive pigment index (SIPI). To estimate leaf N, reflectance ratios were determined for each band combination and were evaluated for their correlation with the leaf N content. A regression model for N estimation was obtained using the reflectance ratio indices at 750 and 710 nm wavelengths (F-ratio = 32 and r ² = 0.551, P < 0.000).  相似文献   

Clinical white spot disease status in Penaeus monodon during the middle of the culture period – its epidemiological significance     

A K Sahoo  C V Mohan  K M Shankar  F Corsin  J F Turnbull  P C Thakur  N V Hao  K L Morgan  A P Padiyar 《Journal of fish diseases》2010,33(7):609-615

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Synthesis and pesticidal activities of some substituted 1,2,4-triazines     

Anil K. Sen Gupta  Tapas Bhattacharya  Kanchan Hajela  Kripa Shankar  Shakeel Ahmad 《Pest management science》1985,16(1):65-72

A series of 5,6-diphenyl-3-substituted-thio-1,2,4-triazines ( II-V ) was prepared by treating 5,6-diphenyl-1,2,4-triazine-3-thiol ( I ) with corresponding electrophiles. Condensation of IV or V with 1,2-phenylenediamines gave 2-[(5,6-diphenyl-1,2,4-triazin-3-yl) thiomethyl-1H-benzimidazoles] ( VI ). IV was converted into its corresponding hydrazide ( VII ) by the action of hydrazine hydrate. N-Benzylidene derivatives ( VIII ) were prepared by the condensation of VII with appropriate aryl or heterocyclic aldehydes. The pesticidal activities of all the compounds thus synthesised were determined.  相似文献   

Diazinon resistant status in Rhipicephalus (Boophilus) microplus collected from different agro-climatic regions of India     

Kumar S  Paul S  Sharma AK  Kumar R  Tewari SS  Chaudhuri P  Ray DD  Rawat AK  Ghosh S 《Veterinary parasitology》2011,181(2-4):274-281

The resistance status of Rhipicephalus (Boophilus) microplus to "Diazinon" was evaluated in 20 locations situated at various agro-climatic regions of India. Adult immersion test (AIT) was optimized using laboratory reared acaricide susceptible IVRI-I strain of R. (B.) microplus and minimum effective concentration of Diazinon was determined as 635.2 ppm. The discriminating dose (DD) was worked out as 1270.4 ppm and was tested on female ticks collected from organized and unorganized farms located at different agro-climatic regions of India. On the basis of the data generated on three variables viz., mortality, egg masses and reproductive index, the resistance level was categorized as I, II, III and IV. The average resistance factor (RF) of 6.1 (level II) was recorded in the ticks collected from the northern sub-temperate trans-gangetic plains while high average RF values of 26.65 (level III) was recorded in the ticks collected from tropical middle-gangetic plains. The tropical middle gangetic plain has a very high density of animal populations where farmers use Diazinon for tick control, for agricultural practices and for mosquito control. Due to the continuous use of OP compounds the environmental load of Diazinon has become high in the area. This is the first experimental data generated on Diazinon resistant status in ticks of India.  相似文献   

Lipid fatty acid profile analyses in liver and serum in rats with nonalcoholic steatohepatitis using improved gas chromatography-mass spectrometry methodology     

Wu X  Tong Y  Shankar K  Baumgardner JN  Kang J  Badeaux J  Badger TM  Ronis MJ 《Journal of agricultural and food chemistry》2011,59(2):747-754

Fatty acids (FAs) are essential components of lipids and exhibit important biological functions. The analyses of FAs are routinely carried out by gas chromatography-mass spectrometry after multistep sample preparation. In this study, several key experimental factors were carefully examined, validated, and optimized to analyze free fatty acid (FFA) and FA profiles of triglycerides and phospholipids in serum or tissue samples. These factors included (1) methylation/transesterification reagents, (2) validation of internal standards, and (3) final step concentration of FA methyl esters. This new method was utilized to analyze FFAs and the FA profiles of triglycerides and phospholipids in the serum and liver from a recently established rat model of nonalcoholic steatohepatitis (NASH). In this model, rats were fed a 220 kcal kg (-3/4) day (-1) diet containing either 5 or 70% corn oil for 21 days using total enteral nutrition. FA compositions of the serum and liver were found to shift from a pattern dominated by saturated and monounsaturated FAs (C16:0/18:1) to one dominated by polyunsaturated C18:2 derived from dietary linoleic acid. Alteration of FA composition in liver after overfeeding of high polyunsaturated fat diets may contribute to the progression of pathological changes from steatosis to inflammation, necrosis, and fibrosis observed in NASH.  相似文献   

Localization of amyloid beta protein messenger RNA in brains from patients with Alzheimer's disease   总被引：43，自引：0，他引：43  

S Bahmanyar  G A Higgins  D Goldgaber  D A Lewis  J H Morrison  M C Wilson  S K Shankar  D C Gajdusek 《Science (New York, N.Y.)》1987,237(4810):77-80

The distribution of cells containing messenger RNA that encodes amyloid beta protein was determined in hippocampi and in various cortical regions from cynomolgus monkeys, normal humans, and patients with Alzheimer's disease by in situ hybridization. Both 35S-labeled RNA antisense and sense probes to amyloid beta protein messenger RNA were used to ensure specific hybridization. Messenger RNA for amyloid beta protein was expressed in a subset of neurons in the prefrontal cortex from monkeys, normal humans, and patients with Alzheimer's disease. This messenger RNA was also present in the neurons of all the hippocampal fields from monkeys, normal humans and, although to a lesser extent in cornu ammonis 1, patients with Alzheimer's disease. The distribution of amyloid beta protein messenger RNA was similar to that of the neurofibrillary tangles of Alzheimer's disease in some regions, but the messenger RNA was also expressed in other neurons that are not usually involved in the pathology of Alzheimer's disease.  相似文献   

Comment on "The great Sumatra-Andaman earthquake of 26 December 2004"     

Neetu S  Suresh I  Shankar R  Shankar D  Shenoi SS  Shetye SR  Sundar D  Nagarajan B 《Science (New York, N.Y.)》2005,310(5753):1431; author reply 1431

Lay et al. (Research Articles, 20 May 2005, p. 1127) estimated a 600-km length for the tsunami source region. Adding tide-gauge data from Paradip, the northernmost of the Indian east-coast stations and therefore the most critical constraint on the northern extent of the source, we estimate that its length was greater by approximately 30%.  相似文献   

Assessment of evaluations made to healthy eating policies in Europe: a review within the EATWELL Project     

Pérez-Cueto FJ  Aschemann-Witzel J  Shankar B  Brambila-Macias J  Bech-Larsen T  Mazzocchi M  Capacci S  Saba A  Turrini A  Niedzwiedzka B  Piorecka B  Kozioł-Kozakowska A  Wills J  Traill WB  Verbeke W 《Public health nutrition》2012,15(8):1489-1496

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