Common composition characteristics of fluoride bearing groundwaters     

V. V. Jagannadha Sarma  A. Narayana Swamy 《Water, air, and soil pollution》1983,20(1):29-39

During routine groundwater surveys of the Visakhapatnam basin, concentrations of fluoride ions above the permissible limit of 1 to 1.5 mg L^?1 have been detected near the village Jaggayyapalem. The fluoride bearing groundwaters of the area were compared with fluoride bearing groundwaters from different parts of the world. It is observed that they contain meager amounts of Ca and Mg and large amounts of Na and bicarbonate. Linear statistical relationships are obtained between fluoride and Ca plus Mg, and bicarbonate.  相似文献   

Clay mineral distribution in two toposequences of tropical soils of India     

V. Murali  G.S.R. Krishna Murti  V.A.K. Sarma   《Geoderma》1978,20(3-4):257-269

The clay fractions of the soils of two toposequences derived from gneissic rocks (Peninsular gneiss) in southern India consist chiefly of kaolinite and amorphous ferrialuminosilicates (AFAS). The cation exchange capacity of the amorphous constituents, ranging between 21.4 and 107.6 mequiv./100 g, has been explained on the basis of a structural model. Considerable amounts of smectite were present in the clays of soils on the toeslopes. Two hypothetical pathways for the formation of the clay minerals are proposed.  相似文献   

Mapping genes for flowering time and frost tolerance in cereals using precise genetic stocks   总被引：1，自引：0，他引：1  

J.W. Snape  R. Sarma  S.A. Quarrie  L. Fish  G. Galiba  J. Sutka 《Euphytica》2001,120(3):309-315

The development of comprehensive genetic maps based on molecular markers has increased the power of genetical analysis immensely in the last few years. Characters previously recalcitrant to analysis, such as abiotic stress responses, are now amenable, and individual major genes and QTL mediating the variation can be identified. This has allowed the development of strategies for stress amelioration by adjusting the timing of the life cycle and introducing genes which enable the plant to tolerate stress. These strategies are illustrated here by showing how genes for vernalization response and cold tolerance on chromosomes 5A and 5D of wheat have been identified and located. Additionally, their relationships to genes in other species, such as barley and rice can be characterised through comparative mapping approaches, leading to strategies for their isolation using rice genomic tools. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   

Haemato-biochemical alterations and oxidative stress associated with naturally occurring porcine circovirus2 infection in pigs     

Rajesh  J. B.  Rajkhowa  S.  Dimri  U.  Prasad  H.  Mohan  N. H.  Hmar  L.  Sarma  K.  Chethan  G. E.  Behera  P.  Jaganmohanarao  G.  Behera  S.  Zosangpuii 《Tropical animal health and production》2020,52(5):2243-2250

Tropical Animal Health and Production - Porcine circovirus2 (PCV2) infection in pigs is one of the major causes of economic loss to the farmers in terms of low production, slow growth and increase...  相似文献   

Modulation of prolactin hormone and intersequence pause days in domestic chickens.     

J Reddy  C G David  P V Sarma  K Singh 《The Veterinary record》2001,149(19):590-592

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Diurnal variations and some environmental aspects of egg production in white leghorns     

V B Reddy  P L Sarma 《The Indian veterinary journal》1965,42(11):849-856

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Sterol Ring System Oxidation Pattern in Marine Sponges     

Nittala S. Sarma  M. Sri Rama Krishna  S. Ramakrishna Rao 《Marine drugs》2005,3(3):84-111

The marine sponges (Porifera) are a unique group of sedentary organisms from which several novel natural products are reported, many of which have useful biological activities. In producing unusual sterols, they occupy a preeminent position among the various groups of organisms. The polar sterols of sponges reported as at the end of the year 2002 number about 250; their ring structure changing a hundred times. The oxidation pattern in the sterol ring system, from the point of view of biogenesis seems to be mainly of four types. Each sponge species is able to produce sterols fitting into one of the four main biogenetic pathways viz., (i) 3β-hydroxy-Δ⁵-sterol pathway, (ii) 3β-hydroxy-Δ⁷-sterol pathway, (iii) 3β-hydroxy-Δ^5,7-sterol pathway, and (iv) 3α-hydroxy sterol pathway.  相似文献   

Effect of substituting live feed with formulated feed on the reproductive performance and fry survival of Siamese fighting fish, Betta splendens (Regan, 1910)     

Mandal SC  Kohli MP  Das P  Singh SK  Munilkumar S  Sarma K  Baruah K 《Fish physiology and biochemistry》2012,38(2):573-584

This study aimed to elucidate the effect of partial or complete replacement of live feed (LF) (Tubifex) with formulated feed (FF) on the reproductive performance of Betta splendens. Three hundred B. splendens fry (average weight 0.19 ± 0.01 g) were equally distributed into five different groups, each with three replicates. They were fed for 105 days with following different diets: control (C)—100% LF; T1—75% LF, 25% FF; T2—50% LF, 50% FF; T3—25% LF, 75% FF, and T4—100% FF. Results showed that the average number of hatched larvae (654 ± 101) and fry survival after 2 weeks of rearing (428 ± 70), after completion of three spawning, were recorded highest in the control group, which was, however, not significantly different from the T1, T2, and T3 groups. At the end of the feeding trial, the highest hatching percentage (90.3%) was registered in the T2 group, which was not significantly different from the control and T1 groups. The T2 group also recorded highest fry survival (65.54%) after completion of three spawning, which was not significantly (P < 0.05) different from the T1 and T3 groups. Control diet contained higher saturated fatty acid (63.23%) than formulated diet (29.80%). In the whole-body tissue, highest level of EPA (0.42%) and DHA (3.13%) were found in the T4 group followed by T3 group. The DHA/EPA ration was recorded highest in the T2 group (10.96%), which did not differ significantly from the T1 and T3 groups. Significant positive correlation was observed between saturated fatty acid levels in fish whole-body tissue and number of hatched larvae (Y = 30.81 × −825.3, R ² = 0.968) and fry survival after 2 weeks of rearing (Y = 21.38 × −580.9, R ² = 0.967). Considering all these factors, it can be concluded that the live feed Tubifex can be replaced up to 50% without any adverse effect on the reproductive performance and fry survival of B. splendens.  相似文献   

Effect of mulching on soil and plant water status, and the growth and yield of wheat (Triticum aestivum L.) in a semi-arid environment     

Debashis Chakraborty  Shantha Nagarajan  V.K. Gupta  R.N. Garg  A. Sarkar  K.S. Sundara Sarma 《Agricultural Water Management》2008,95(12):1323-1334

Mulching is one of the important agronomic practices in conserving the soil moisture and modifying the soil physical environment. Wheat, the second most important cereal crop in India, is sensitive to soil moisture stress. Field experiments were conducted during winter seasons of 2004-2005 and 2005-2006 in a sandy loam soil to evaluate the soil and plant water status in wheat under synthetic (transparent and black polyethylene) and organic (rice husk) mulches with limited irrigation and compared with adequate irrigation with no mulch (conventional practices by the farmers). Though all the mulch treatments improved the soil moisture status, rice husk was found to be superior in maintaining optimum soil moisture condition for crop use. The residual soil moisture was also minimum, indicating effective utilization of moisture by the crop under RH. The plant water status, as evaluated by relative water content and leaf water potential were favourable under RH. Specific leaf weight, root length density and dry biomass were also greater in this treatment. Optimum soil and canopy thermal environment of wheat with limited fluctuations were observed under RH, even during dry periods. This produced comparable yield with less water use, enhancing the water use efficiency. Therefore, it may be concluded that under limited irrigation condition, RH mulching will be beneficial for wheat as it is able to maintain better soil and plant water status, leading to higher grain yield and enhanced water use efficiency.  相似文献   

ISSR and SSR markers reveal sex-specific DNA sequences in three <Emphasis Type="Italic">Calamus</Emphasis> species from India     

Prabalee Sarmah  Vishwa J. Barua  Jyotismrita Nath  R. N. Sarma  Binoy Kurian  A. S. Hemanthkumar  K. K. Sabu 《Agroforestry Systems》2017,91(3):509-513

Calamus species yields the raw materials for the cane industry. However, the extraction of the cane from the forests is being carried out indiscriminately without considering the sustenance of the species. Plants of both sexes should co-exist for reproductive success. The sex of Calamus plants can be identified only after flowering and hence proper planning of managed forestry practices cannot be accomplished. A study was carried out in this background and male specific ISSR markers for C. tenuis and C. flagellum and SSR markers for C. thwaitesii were identified. The diagnostic potential of these markers can be exploited to sex the Calamus species at the seedling stage for proper breeding and agroforestry management.  相似文献