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Search Results: 1 - 10 of 498 matches for " Qasim Ayub "
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Agro-technology of Intercropping Guara (Syamopsis Psoraliodes) and Mungbean (Vigna radiata)
Himayatullah Khan,Khalil Ahmad,M. Qasim,M. Ayub
Journal of Biological Sciences , 2001,
Abstract: An experiment was conducted to study the feasibility of intercropping Mungbean in Guara sown at 30, 45, 60 and 75 cm spaced single, double, triple and four row strips, respectively. Guara sown at 45 cm spaced double-row strips with two rows of Mungbean produced significantly more number of branches, grain and stalk yield ha-1 while number of branches and stalk yield of mungbean were not effected significantly. However, the grain yield of Mungbean was increased significantly in the intercropping system. Among the different planting patterns, guara planted in 45 cm spaced double-row strips in association with two rows of mungbean gave the highest land equivalent ratio (LER) of 1.55.
Feasibility of Intercropping Mungbean (Vigna radiata) in Guara (Syamopsis psoraliodes)
Himayat Ullah Khan,Muhammad Ayub,Muhammad Qasim,Muhammad Subhan
Journal of Biological Sciences , 2001,
Abstract: Guara sown at 45 cm spaced double-row strips with two rows of intercropped Mungbean produced significantly more No. of pods, heavier grains and maximum grain yield. Mungbean sown between 45, 60 and 75 cm spaced double, triple and four row strips of Guara respectively, did not significantly effect No. of pods, thousand grain weight and grain yield per plant.
A Genome-Wide Survey of Genetic Variation in Gorillas Using Reduced Representation Sequencing
Aylwyn Scally, Bryndis Yngvadottir, Yali Xue, Qasim Ayub, Richard Durbin, Chris Tyler-Smith
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0065066
Abstract: All non-human great apes are endangered in the wild, and it is therefore important to gain an understanding of their demography and genetic diversity. Whole genome assembly projects have provided an invaluable foundation for understanding genetics in all four genera, but to date genetic studies of multiple individuals within great ape species have largely been confined to mitochondrial DNA and a small number of other loci. Here, we present a genome-wide survey of genetic variation in gorillas using a reduced representation sequencing approach, focusing on the two lowland subspecies. We identify 3,006,670 polymorphic sites in 14 individuals: 12 western lowland gorillas (Gorilla gorilla gorilla) and 2 eastern lowland gorillas (Gorilla beringei graueri). We find that the two species are genetically distinct, based on levels of heterozygosity and patterns of allele sharing. Focusing on the western lowland population, we observe evidence for population substructure, and a deficit of rare genetic variants suggesting a recent episode of population contraction. In western lowland gorillas, there is an elevation of variation towards telomeres and centromeres on the chromosomal scale. On a finer scale, we find substantial variation in genetic diversity, including a marked reduction close to the major histocompatibility locus, perhaps indicative of recent strong selection there. These findings suggest that despite their maintaining an overall level of genetic diversity equal to or greater than that of humans, population decline, perhaps associated with disease, has been a significant factor in recent and long-term pressures on wild gorilla populations.
YFitter: Maximum likelihood assignment of Y chromosome haplogroups from low-coverage sequence data
Luke Jostins,Yali Xu,Shane McCarthy,Qasim Ayub,Richard Durbin,Jeff Barrett,Chris Tyler-Smith
Quantitative Biology , 2014,
Abstract: Low-coverage short-read resequencing experiments have the potential to expand our understanding of Y chromosome haplogroups. However, the uncertainty associated with these experiments mean that haplogroups must be assigned probabilistically to avoid false inferences. We propose an efficient dynamic programming algorithm that can assign haplogroups by maximum likelihood, and represent the uncertainty in assignment. We apply this to both genotype and low-coverage sequencing data, and show that it can assign haplogroups accurately and with high resolution. The method is implemented as the program YFitter, which can be downloaded from http://sourceforge.net/projects/yfitter/
Contrasting signals of positive selection in genes involved in human skin-color variation from tests based on SNP scans and resequencing
Johanna de Gruijter, Oscar Lao, Mark Vermeulen, Yali Xue, Cara Woodwark, Christopher J Gillson, Alison J Coffey, Qasim Ayub, S Qasim Mehdi, Manfred Kayser, Chris Tyler-Smith
Investigative Genetics , 2011, DOI: 10.1186/2041-2223-2-24
Abstract: Applying all commonly used neutrality-test statistics for allele frequency distribution to the newly generated sequence data provided conflicting results regarding evidence for positive selection. Previous haplotype-based findings could not be clearly confirmed. Although some tests were marginally significant for some populations and genes, none of them were significant after multiple-testing correction. Combined P values for each gene-population pair did not improve these results. Application of Approximate Bayesian Computation Markov chain Monte Carlo based to these sequence data using a simple forward simulator revealed broad posterior distributions of the selective parameters for all four genes, providing no support for positive selection. However, when we applied this approach to published sequence data on SLC45A2, another human pigmentation candidate gene, we could readily confirm evidence for positive selection, as previously detected with sequence-based and some haplotype-based tests.Overall, our data indicate that even genes that are strong biological candidates for positive selection and show reproducible signatures of positive selection in SNP scans do not always show the same replicability of selection signals in other tests, which should be considered in future studies on detecting positive selection in genetic data.Large-scale genotyping projects using genome-wide single-nucleotide polymorphisms (SNPs) have provided large amounts of data describing the genetic diversity of human populations [1-6]. Several statistical methods have been developed and used for detection of signatures of selective processes from genome-wide SNP data, which we refer to as 'SNP scans' [7]. All these approaches try to recover fingerprints of selective sweeps by detecting signals in the haplotypic variation of a genomic region and/or the spectrum of the variation of the genetic diversity [8-15]. However, the results obtained with the different test statistics usually show limi
Analysis of a Recent Biofilter Model for Toluene Biodegradation  [PDF]
Muhammad Qasim, Zarook Shareefdeen
Advances in Chemical Engineering and Science (ACES) , 2013, DOI: 10.4236/aces.2013.31006
Abstract:

This paper investigates and provides a critical analysis of the toluene biofilter model developed by Li and De Visscher. The model simulation results have been reproduced and compared with several sets of experimental data from literature. Three different model variations are considered: model with no substrate inhibition, with substrate inhibition, and with air flow rate modification. A sensitivity analysis has been performed on model to study the effect of important parameters on the removal efficiency. Model limitations and improvements have been highlighted.

Replication of the Association of a MET Variant with Autism in a Chinese Han Population
Xue Zhou, Yang Xu, Jia Wang, Hongbo Zhou, Xian Liu, Qasim Ayub, Xuelai Wang, Chris Tyler-Smith, Lijie Wu, Yali Xue
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0027428
Abstract: Background Autism is a common, severe and highly heritable neurodevelopmental disorder in children, affecting up to 100 children per 10,000. The MET gene has been regarded as a promising candidate gene for this disorder because it is located within a replicated linkage interval, is involved in pathways affecting the development of the cerebral cortex and cerebellum in ways relevant to autism patients, and has shown significant association signals in previous studies. Principal Findings Here, we present new ASD patient and control samples from Heilongjiang, China and use them in a case-control and family-based replication study of two MET variants. One SNP, rs38845, was successfully replicated in a case-control association study, but failed to replicate in a family-based study, possibly due to small sample size. The other SNP, rs1858830, failed to replicate in both case-control and family-based studies. Conclusions This is the first attempt to replicate associations in Chinese autism samples, and our result provides evidence that MET variants may be relevant to autism susceptibility in the Chinese Han population.
Chaotic Properties on Time Varying Map and Its Set Valued Extension  [PDF]
Ayub Khan, Praveen Kumar
Advances in Pure Mathematics (APM) , 2013, DOI: 10.4236/apm.2013.33051
Abstract: Every autonomous dynamical system X, finduces a set-valued dynamical system \"\"on the space of compact subsets of X. In this paper we have investigated some chaotic relations between a nonautonomous dynamical system and its set valued extension.
Chaos Synchronization in Lorenz System  [PDF]
Ayub Khan, Prempal Singh
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.611164
Abstract: In this paper, we analyze chaotic dynamics of nonlinear systems and study chaos synchronization of Lorenz system. We extend our study by discussing other methods available in literature. We propose a theorem followed by a lemma in general and another one for a particular case of Lorenz system. Numerical simulations are given to verify the proposed theorems.
China Pakistan Economic Corridor (CPEC); Most Valuable Dream for Pakistan through Economic Integration in the Region but May Not Become True without Upgradation of Physical Infrastructure and Legal System!  [PDF]
Rohimi Shapiee, Rao Qasim Idrees
Beijing Law Review (BLR) , 2017, DOI: 10.4236/blr.2017.84027
Abstract: To achieve the goal of sustainable economic development of Pakistan through logistics arrangements in CPEC, this research paper identifies and analyses benefits of CPEC, and also examines and highlights the legal system of Pakistan and its associated deficiencies in this context. Furthermore, this research paper critically examines the present logistics arrangement between China and Pakistan with reference to trade in services commitments and their impacts on such agreement. Governance, law and policy issues towards achieving Sustainable Development Goals (SDGs) are also big concerns for Pakistan. This will raise diverse legal and policy issues hence create uncertainty and conflict of laws both domestic and internationally. These issues can be handled and solved through upgrading domestic transport and logistics laws and making them in line with international practice. Furthermore coordination and cooperation between local institutes and agencies is most important initiative to gain maximum benefits. Adoption and accession of international conventions of transport and logistics will also have key role to play for better results from CPEC. The current research is rested on qualitative and socio- legal methods of research whereby the authors opt for a qualitative research design as opposed to a quantitative one. The research design would be the analysis between road transport and logistics investment laws exists in Pakistan and Chinese model of logistics arrangement formulated in CPEC by both countries. This research paper will discuss these in detail. Firstly, China Pakistan bilateral trade relations and impacts on Pakistan economy. Secondly, CPEC transport and logistics investment in physical infrastructure in Pakistan. Thirdly, analysis of current rules and regulations applicable for China Pakistan bilateral trade and logistics arrangements. Fourthly, CPEC investment and future challenges for Pakistan and finally proposed comprehensive logistics investment framework agreement.
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