Rapid and Differential Proliferation of the Ty3-Gypsy LTR Retrotransposon Atlantys in the Genus Oryza     

Andrea Zuccolo  Jetty S. S. Ammiraju  HyeRan Kim  Abhijit Sanyal  Scott Jackson  Rod A. Wing 《Rice》2008,1(1):85-99

Here, we present the results of a comprehensive study of the distribution, evolution, heterogeneity, and phylogenetic relationships of the Ty3-Gypsy Atlantys long terminal repeat retrotransposable element family in Oryza. Atlantys element-related sequences make up a significant fraction of the genomes of species from the Officinalis complex as well as the Oryza ridleyi and O. granulata genomes. The proliferation of Atlantys elements, in many cases, took place after respective speciation events occurred. Most of the retrotranspositional events occurred within the last three million years. Atlantys is an ancient and ubiquitous component of the genus Oryza and has made significant contributions to genome size variation across the genus. Its structure is unusual when compared to other Ty3-Gypsy elements and its proliferation in the different Oryza species has been rapid and differential.  相似文献   

Identification of Lathyrus sativus plant volatiles causing behavioral preference of Aphis craccivora     

Paroma Mitra  Swati Das  Rahul Debnath  Syed Husne Mobarak  Anandamay Barik 《Pest management science》2021,77(1):285-299

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Factors limiting the health of semi-scavenging ducks in Bangladesh     

Hoque MA  Skerratt LF  Cook AJ  Khan SA  Grace D  Alam MR  Vidal-Diez A  Debnath NC 《Tropical animal health and production》2011,43(2):441-450

Duck rearing is well suited to coastal and lowland areas in Bangladesh. It is an important component of sustainable livelihood strategies for poor rural communities as an additional source of household income. An epidemiological study was conducted during January 2005–June 2006 on 379 households in Chatkhil of the Noakhali District, Bangladesh which were using the recently devised “Bangladesh duck model”. The overall objective of the study was to identify factors that significantly contributed to mortality and constrained productivity and to generate sufficient knowledge to enable establishment of a disease surveillance system for household ducks. The overall mortality was 15.0% in Chatkhil, with predation causing a significantly higher mortality compared with diseases (p < 0.001). Common diseases were duck plague and duck cholera. Morbid ducks frequently displayed signs associated with diseases affecting the nervous and digestive systems. Haemorrhagic lesions in various organs and white multiple foci on the liver were frequently observed in dead ducks. Epidemiological analysis with a shared frailty model that accounted for clustering of data by farm was used to estimate the association between survival time and risk factors. The overall mortality rate due to disease was significantly lower in vaccinated than in non-vaccinated ducks in all zones except zone 2 (p < 0.001). Only vaccinated ducks survived in zone 1. In conclusion, duck mortality and untimely sale of ducks appeared to be important constraints for household duck production in Chatkhil. Vaccination against duck plague appears to be an effective preventive strategy in reducing the level of associated duck mortality. A successful network was established amongst farmers and the surveillance team through which dead ducks, with accompanying information, were readily obtained for analysis. Therefore, there is an opportunity for establishing a long-term disease surveillance programme for rural ducks in Chatkhil of the Noakhali District of Bangladesh.  相似文献   

Entomotoxic effect of silica nanoparticles against <Emphasis Type="Italic">Sitophilus oryzae</Emphasis> (L.)     

Nitai Debnath  Sumistha Das  Dipankar Seth  Ramesh Chandra  Somesh Ch. Bhattacharya  Arunava Goswami 《Journal of pest science》2011,84(1):99-105

Fumigants and residual insecticides are commonly used to combat stored grain pests. In recent years, consumer awareness of the health hazard from residual toxicity and the growing problem of insect resistance to these conventional insecticides have led the researchers to look for alternative strategies for stored grains protection. For example, diatomaceous earth (DE) can be effective against stored grain insects. In this study, DE was used to design amorphous nano sized hydrophilic, hydrophobic, and lipophilic silica in 15–30 nm size range. Nanocides are expected to reduce the volume of application and kinetics of development of resistance in pests. We hypothesized that surface-functionalized silica nanoparticle (SNP) might be a viable alternative to conventional pesticides. Entomotoxicity of SNP was tested against rice weevil Sitophilus oryzae and its efficacy was compared with bulk-sized silica (individual particles larger than 1 μm). Amorphous SNP was found to be highly effective against this insect pest causing more than 90% mortality, indicating the effectiveness of SNP to control insect pests.  相似文献   

Standing biomass and carbon storage of above-ground structures in dominant mangrove trees in the Sundarbans   总被引：1，自引：0，他引：1  

Abhijit MitraKasturi Sengupta  Kakoli Banerjee 《Forest Ecology and Management》2011,261(7):1325-1335

We evaluated carbon stocks in the above-ground biomass (AGB) of three dominant mangrove species (Sonneratia apetala, Avicennia alba and Excoecaria agallocha) in the Indian Sundarbans. We examined whether these carbon stocks vary with spatial locations (western region vs. central region) and with seasons (pre-monsoon, monsoon and post-monsoon). Among the three studied species, S. apetala showed the maximum above-ground carbon storage (t ha⁻¹) followed by A. alba (t ha⁻¹) and E. agallocha (t ha⁻¹). The above-ground biomass (AGB) varied significantly with spatial locations (p < 0.05) but not with seasons (p < 0.05). The variation may be attributed to different environmental conditions to which these areas are exposed to such as higher siltation and salinity in central region compared to western region. The relatively higher salinity in central region caused subsequent lowering of biomass and stored carbon of the selected species.  相似文献   

Assessment of critical limit of boron for cowpea in piedmont soils of Arunachal Pradesh     

Prankanu Debnath  Saroj Kumar Pattanaaik  Dinesh Sah  Ajai Kumar Pandey 《Archives of Agronomy and Soil Science》2013,59(11):1649-1658

A study was conducted with 24 piedmont soils of Arunachal Pradesh (India) to estimate the critical limit of available boron (B) in soil and cowpea plant for predicting the response of cowpea (Vigna unguiculata L. Walp.) to B application. The critical concentration of available B in these soils was established by graphical procedure at 0.48 mg kg^?1 for soil and at 24.5 mg kg^?1 in the plant tissues. Soil containing available B below the critical limit responded appreciably to B fertilization. A negative response to B application was also observed in soils at higher level of available B. The average dry matter yield increased with the increasing level of B application up to 1.5 mg kg^?1. The yield response to B application in cowpea on B deficient soils was 34.5%. Based on the critical value of 0.48 mg kg^?1, 10 soils were rated to be adequate and 20.0% soils belonging to this category responding to B application, whereas 85.7% soils below the critical value showed a positive response to B application. The hot water soluble B was significantly and positively correlated with organic carbon, cation exchange capacity and clay contents and negatively correlated with pH, silt and sand contents of soils.  相似文献   

Inter-simple sequence repeat (ISSR)-PCR analysis to assess genetic diversity in a collection of wild cloudberry (Rubus chamaemorus L.) clones     

Samir C. Debnath 《The Journal of Horticultural Science and Biotechnology》2013,88(5):727-732

Summary

Forty-eight wild cloudberry (Rubus chamaemorus L.) clones, collected from four Canadian Provinces, were assessed for genetic variability using inter-simple sequence repeat (ISSR)-PCR methods. Nine primers generated 138 polymorphic ISSR bands. A substantial degree of genetic diversity was found among the wild collection. Cluster analysis by the unweighted pair-group method with arithmetic averages (UPGMA) separated the 48 wild clones into six main clusters, and identified the one remaining clone as an outlier. Furthermore, within four of the clusters, the clones tended to form sub-clusters that were in agreement with a principal coordinate (PCO) analysis. Geographical distribution explained 8% of the total variation revealed by analysis of molecular variance (AMOVA). The ISSR markers detected a sufficient degree of polymorphism to differentiate among cloudberry clones, making this technology valuable for germplasm management, and more efficient choices of parents in current cloudberry breeding programmes.  相似文献   

Studies on compression behaviour of polypropylene needle punched nonwoven fabrics under wet condition     

Sanjoy Debnath  M. Madhusoothanan 《Fibers and Polymers》2013,14(5):854-859

The present study deals with the effect of parallel-laid and cross-laid web of polypropylene needle punched nonwoven fabrics on compression properties (initial thickness, percentage compression, percentage thickness loss and percentage compression resilience) under wet condition. These compression properties of polypropylene needle-punched nonwoven under wet condition have also been compared with its dry condition. With the increase in needling density the initial thickness, percentage compression and percentage thickness loss of the fabrics under wet condition decrease to higher extent compared to its dry condition both in case of parallel-laid and cross-laid fabrics. Cross-laid nonwoven fabric presents lower value of initial thickness percentage compression and thickness loss compared to parallel-laid fabric which is very prominent at high needling density (350 punches/cm²). The percentage compression resilience shows increasing trend with the increase in needling density both under dry and wet conditions of parallel-laid web. It also follows similar trend in case of cross-laid nonwoven under wet condition. The optimum needling density for compression resilience of cross-laid nonwoven fabric under dry condition is 250 punches/cm².  相似文献   

Yarn engineering using hybrid artificial neural network-genetic algorithm model     

Subhasis Das  Anindya Ghosh  Abhijit Majumdar  Debamalya Banerjee 《Fibers and Polymers》2013,14(7):1220-1226

This work aims to manufacture cotton yarns with requisite quality by choice of suitable raw materials for a given spinning system. To fulfill this aim, a hybrid model based on Artificial Neural Network (ANN) and Genetic Algorithm (GA) has been developed which captures both the high prediction power of ANN and global solution searching ability of GA. In an attempt to achieve a yarn having predefined tenacity and evenness, a constrained optimization problem is formulated with the ANN input-output relation between fibre and yarn properties. GA has been used to solve the optimization problem by searching the best combination of fibre properties that can translate into reality a yarn with the desired quality. The model is capable in identifying the set of fibre properties that gives requisite yarn quality with reasonable degree of accuracy.  相似文献   

Selection of raw materials in textile spinning industry using fuzzy multi-criteria decision making approach     

Abhijit Majumdar 《Fibers and Polymers》2010,11(1):121-127

Selection of raw materials in textile spinning industry is a multi-criteria decision making problem. It is a decision of strategic importance as textile is a typical high volume but low profit industry. The nature of raw material selection decision, in most of the cases, is very crude and unstructured. Therefore, advanced decision science techniques might be useful for solving such kind of intricate problems. The inability of common decision making methods to handle imprecision and uncertainty, make them inapt in situations which involves fuzzy information. However, fuzzy decision making techniques can elicit reasonable and logical solutions in these situations. This paper presents the use of fuzzy Analytic Hierarchy Process (AHP) to select the raw materials (cotton fibres) for the textile spinning industries. The results indicate that the fuzzy AHP can quantitatively translate the imprecise perception of the decision maker and yield better results than some of the traditional raw material selection methods used in the textile industry.  相似文献