Zakir Hossain - Academia.edu (original) (raw)

Papers by Zakir Hossain

Research paper thumbnail of Response of Transplanted Rice to Different Application Methods of Urea Fertilizer

Research paper thumbnail of Capture efficiency of insect natural enemies from tall and short vegetation using vacuum sampling

Annals of Applied Biology, 1999

Experiments were conducted in lucerne to determine the efficiency of vacuum sampling of insects a... more Experiments were conducted in lucerne to determine the efficiency of vacuum sampling of insects and whether this was affected by the height of vegetation sampled. Three insects of significance as predators of pests in Australian lucerne were studied: transverse ladybird beetle (Coccinella transversalis Fabricius), pollen beetle (Dicranolaius bellulus (Guérin-Méneville)), and spined predatory shield bug (Oechalia schellembergii (Guérin-Méneville)). In a preliminary experiment comparing a commercially harvested area of lucerne with an unharvested area within the same crop, the proportions of released insects recaptured from unharvested lucerne were significantly lower than recoveries from the shorter, harvested lucerne. Resampling the tall lucerne after it was cut by hand gave cumulative recapture proportions which did not differ from those observed for the harvested lucerne. A second experiment with a randomised replicated design re-tested the hypotheses of the preliminary experiment for two insect species. Very similar results were obtained. This verification showed that recapture efficiencies from tall lucerne ranged between 0.60 and 0.74 but that resampling after hand cutting gave cumulative recapture proportions in excess of 0.86 which did not differ from recapture proportions from short lucerne.

Research paper thumbnail of African-American fathers' involvement with infants: Relationship to their functioning style, support, education, and income

Infant Behavior & Development, 1994

Using the cultural and human ecology models as a guide, African-American fathers' involvement wit... more Using the cultural and human ecology models as a guide, African-American fathers' involvement with infants as a function of whether their wife worked full-time or part-time, and the association between father involvement and fathers' functional styles within the family, family support, income, and education were examined. Fathers were less likely to engage in and devote time to basic caregiving activities than were mothers. Paternal investment in childcare did not differ as a function of whether wives worked full-time or part-time outside of the home. Fathers were more likely to invest time in playing with the infant than in feeding or cleaning. Fathers' ability to communicate effectively within the family and their commitment to the family were significantly associated with their degree of involvement in feeding and comforting infants. The data are discussed with respect to role differentiation in caregiving in African-American families.

Research paper thumbnail of African-American fathers' involvement with infants: Relationship to their functioning style, support, education, and income

Infant Behavior & Development, 1994

Using the cultural and human ecology models as a guide, African-American fathers' involvement wit... more Using the cultural and human ecology models as a guide, African-American fathers' involvement with infants as a function of whether their wife worked full-time or part-time, and the association between father involvement and fathers' functional styles within the family, family support, income, and education were examined. Fathers were less likely to engage in and devote time to basic caregiving activities than were mothers. Paternal investment in childcare did not differ as a function of whether wives worked full-time or part-time outside of the home. Fathers were more likely to invest time in playing with the infant than in feeding or cleaning. Fathers' ability to communicate effectively within the family and their commitment to the family were significantly associated with their degree of involvement in feeding and comforting infants. The data are discussed with respect to role differentiation in caregiving in African-American families.

Research paper thumbnail of Magnetic order and crystal structure in the superconducting RNi2B2C materials

Physical Review B, 1997

Neutron-diffraction measurements have been carried out to investigate the crystal structure, magn... more Neutron-diffraction measurements have been carried out to investigate the crystal structure, magnetic structures, and magnetic phase transitions in RNi 2 B 2 C (Rϭ Y, Ce, Pr, Nd, Tb, Dy, Ho, Er, Tm, and Yb͒. The materials that order magnetically exhibit a wide variety of both commensurate and incommensurate magnetic structures, which argues strongly that the dominant exchange interactions are of the indirect Ruderman-Kittel-Kasuya-Yosida type. The Nd system exhibits a commensurate antiferromagnetic ordering at 4.8 K, with wave vector ␦ϭ(1/2,0,1/2) and moment direction along a ͑or equivalently with ␦ϭ(0,1/2,1/2) and moment direction along b in this tetragonal system͒. For Dy (T N ϭ10.6 K), Pr (T N ϭ4.0 K), and the low-temperature phase of Ho, the magnetic structure is also a commensurate antiferromagnet that consists of ferromagnetic sheets of rare-earth moments in the a-b plane, with the sheets coupled antiferromagnetically along the c axis ͓␦ϭ(0,0,1)͔. Pr is not superconducting, while for Dy (T c ϭ6 K) and Ho (T c ϭ8 K) this magnetic order coexists with superconductivity. For Ho, though, the magnetic state that initially forms at T N Ϸ8.5 K is an incommensurate spiral antiferromagnetic state along the c axis in which the direction of these ferromagnetic sheets are rotated in the a-b plane by ϳ17°from their low-temperature antiparallel configuration ͓␦ϭ(0,0,0.91)͔. The intensity for this spiral state reaches a maximum near the reentrant superconducting transition (ϳ5 K); the spiral state then collapses at lower temperature in favor of the commensurate antiferromagnetic state. An incommensurate a-axis modulation, with ␦ϭ(0.55,0,0), is also observed above the spiral-antiferromagnetic transition, but it exists over a narrower temperature range than the spiral state, and also collapses near the reentrant superconducting transition. The Er system forms an incommensurate, transversely polarized spin-density wave ͑SDW͒ state at T N ϭ6.8 K, with ␦ϭ(0.553,0,0) and moment direction along b ͑or with ␦ along b and the moment direction along a). The SDW squares up at low T, and coexists with the superconducting state (T c ϭ11 K) over the full temperature range where magnetic order is present. Tb, which does not superconduct, orders with a very similar wave vector, but the SDW is longitudinally polarized in this case and again squares up at low T. Tm orders at T N ϭ1.5 K in a transversely polarized SDW state, but with the moments along the c axis and ␦ϭ(0.093,0.093,0). This state is coexistent with superconductivity (T c ϭ11 K). No significant magnetic moment is found to develop on the Ni site in any of the materials, and there is no magnetic ordering of any kind in the Y, Yb, or Ce materials. Profile refinements have also been carried out on these same samples to investigate the systematics of the crystallography, and the crystal structure is I4/mmm over the full range of compositions and temperatures investigated. The area of the a-b plane and the volume of the unit cell both decrease smoothly with either decreasing lanthanide radius or decreasing temperature, but the strong boron-carbon and nickel-carbon bonding then forces the c axis to expand.

Research paper thumbnail of Bulk superconductivity at an elevated temperature (Tc~=12 K) in a nickel containing alloy system Y-Ni-B-C

Physical Review Letters, 1994

We report here our discovery of bulk superconductivity at rather high T c in samples having nomin... more We report here our discovery of bulk superconductivity at rather high T c in samples having nominal compositions YNi 4 BO 0.2 (T c ≊12.5 K) and YNi 2 B 3 O 0.2 (T c ≊13.5 K). While YNi 4 BC 0.2 seems to be a single phase ...

Research paper thumbnail of Molecular paper 28 -5-08

A total of thirty microsatellite molecular markers were used across 21 rice genotypes for their c... more A total of thirty microsatellite molecular markers were used across 21 rice genotypes for their characterization and discrimination. The number of alleles per locus ranged from 3 alleles (RM165, RM219, RM248, RM463, RM470 and RM517) to 9 alleles (RM223), with an average of 4.53 alleles across the 30 loci obtained in the study. The polymorphism information content (PIC) values ranged from 0.30 (RM219) to 0.84 (RM223), were identified in all 30 loci. RM223 was found the best marker for identification of 21 genotypes as revealed by PIC values. The frequency of the most common allele at each locus ranged from 24% (RM223 and RM334) to 81% (RM219). A two dimensional principal coordinate analysis (PCoA) with 21 genotypes showed that the genotypes Supper Basmoti, Basmati370 ,BasmatiD Keora, Chinisakkora, Thakurbhog, Benaful, Kolgochi , Buchi, Awnedtapl and kalijira-11 were found far away from centroid of the cluster and rest of the genotypes which placed around the centroid. The pairwise genetic dismilarity coefficient indicated that the highest genetic distance was obtained between Thakurbhog and SupperBasmoti, as well as Benaful and Keora(0.81).Basmati( SupperBasmoti, Basmati370 and BasmatiD) and Kalijira ( Kalijira 11,12,13,14) genotype had close similarity among them but showed wide dissimilarity with other local genotypes. Being grouped into distant clusters, Superbasmati, Thakurbhog, Keora and Benaful could be utilized as potential parents for the crop improvement of fine grain aromatic rice varities. Genotypes Kolgochi and Buchi (having zero dissimilarity) might be possessed same genetic background. The microsatellite marker based molecular fingerprinting could serve as a sound basis in the identification of genetically distant accessions as well as in the duplicate sorting of the morphologically close accessions.

Research paper thumbnail of MOLECULAR CHARACTERIZATION AND GENETIC DIVERSITY IN FINE GRAIN AND AROMATIC LANDRACES OF RICE (Oryza Sativa L.) USING MICROSATELLITE MARKERS

A total of thirty microsatellite molecular markers were used across 21 rice genotypes for their c... more A total of thirty microsatellite molecular markers were used across 21 rice genotypes for their characterization and discrimination. The number of alleles per locus ranged from 3 alleles (RM165, RM219, RM248, RM463, RM470 and RM517) to 9 alleles (RM223), with an average of 4.53 alleles across the 30 loci obtained in the study. The polymorphism information content (PIC) values ranged from 0.30 (RM219) to 0.84 (RM223), were identified in all 30 loci. RM223 was found the best marker for identification of 21 genotypes as revealed by PIC values. The frequency of the most common allele at each locus ranged from 24% (RM223 and RM334) to 81% (RM219). A two dimensional principal coordinate analysis (PCoA) with 21 genotypes showed that the genotypes Supper Basmoti, Basmati370 ,BasmatiD Keora, Chinisakkora, Thakurbhog, Benaful, Kolgochi , Buchi, Awnedtapl and kalijira-11 were found far away from centroid of the cluster and rest of the genotypes which placed around the centroid. The pairwise genetic dismilarity coefficient indicated that the highest genetic distance was obtained between Thakurbhog and SupperBasmoti, as well as Benaful and Keora(0.81).Basmati( SupperBasmoti, Basmati370 and BasmatiD) and Kalijira ( Kalijira 11,12,13,14) genotype had close similarity among them but showed wide dissimilarity with other local genotypes. Being grouped into distant clusters, Superbasmati, Thakurbhog, Keora and Benaful could be utilized as potential parents for the crop improvement of fine grain aromatic rice varities. Genotypes Kolgochi and Buchi (having zero dissimilarity) might be possessed same genetic background. The microsatellite marker based molecular fingerprinting could serve as a sound basis in the identification of genetically distant accessions as well as in the duplicate sorting of the morphologically close accessions.

Research paper thumbnail of Response of Transplanted Rice to Different Application Methods of Urea Fertilizer

Research paper thumbnail of Capture efficiency of insect natural enemies from tall and short vegetation using vacuum sampling

Annals of Applied Biology, 1999

Experiments were conducted in lucerne to determine the efficiency of vacuum sampling of insects a... more Experiments were conducted in lucerne to determine the efficiency of vacuum sampling of insects and whether this was affected by the height of vegetation sampled. Three insects of significance as predators of pests in Australian lucerne were studied: transverse ladybird beetle (Coccinella transversalis Fabricius), pollen beetle (Dicranolaius bellulus (Guérin-Méneville)), and spined predatory shield bug (Oechalia schellembergii (Guérin-Méneville)). In a preliminary experiment comparing a commercially harvested area of lucerne with an unharvested area within the same crop, the proportions of released insects recaptured from unharvested lucerne were significantly lower than recoveries from the shorter, harvested lucerne. Resampling the tall lucerne after it was cut by hand gave cumulative recapture proportions which did not differ from those observed for the harvested lucerne. A second experiment with a randomised replicated design re-tested the hypotheses of the preliminary experiment for two insect species. Very similar results were obtained. This verification showed that recapture efficiencies from tall lucerne ranged between 0.60 and 0.74 but that resampling after hand cutting gave cumulative recapture proportions in excess of 0.86 which did not differ from recapture proportions from short lucerne.

Research paper thumbnail of African-American fathers' involvement with infants: Relationship to their functioning style, support, education, and income

Infant Behavior & Development, 1994

Using the cultural and human ecology models as a guide, African-American fathers' involvement wit... more Using the cultural and human ecology models as a guide, African-American fathers' involvement with infants as a function of whether their wife worked full-time or part-time, and the association between father involvement and fathers' functional styles within the family, family support, income, and education were examined. Fathers were less likely to engage in and devote time to basic caregiving activities than were mothers. Paternal investment in childcare did not differ as a function of whether wives worked full-time or part-time outside of the home. Fathers were more likely to invest time in playing with the infant than in feeding or cleaning. Fathers' ability to communicate effectively within the family and their commitment to the family were significantly associated with their degree of involvement in feeding and comforting infants. The data are discussed with respect to role differentiation in caregiving in African-American families.

Research paper thumbnail of African-American fathers' involvement with infants: Relationship to their functioning style, support, education, and income

Infant Behavior & Development, 1994

Using the cultural and human ecology models as a guide, African-American fathers' involvement wit... more Using the cultural and human ecology models as a guide, African-American fathers' involvement with infants as a function of whether their wife worked full-time or part-time, and the association between father involvement and fathers' functional styles within the family, family support, income, and education were examined. Fathers were less likely to engage in and devote time to basic caregiving activities than were mothers. Paternal investment in childcare did not differ as a function of whether wives worked full-time or part-time outside of the home. Fathers were more likely to invest time in playing with the infant than in feeding or cleaning. Fathers' ability to communicate effectively within the family and their commitment to the family were significantly associated with their degree of involvement in feeding and comforting infants. The data are discussed with respect to role differentiation in caregiving in African-American families.

Research paper thumbnail of Magnetic order and crystal structure in the superconducting RNi2B2C materials

Physical Review B, 1997

Neutron-diffraction measurements have been carried out to investigate the crystal structure, magn... more Neutron-diffraction measurements have been carried out to investigate the crystal structure, magnetic structures, and magnetic phase transitions in RNi 2 B 2 C (Rϭ Y, Ce, Pr, Nd, Tb, Dy, Ho, Er, Tm, and Yb͒. The materials that order magnetically exhibit a wide variety of both commensurate and incommensurate magnetic structures, which argues strongly that the dominant exchange interactions are of the indirect Ruderman-Kittel-Kasuya-Yosida type. The Nd system exhibits a commensurate antiferromagnetic ordering at 4.8 K, with wave vector ␦ϭ(1/2,0,1/2) and moment direction along a ͑or equivalently with ␦ϭ(0,1/2,1/2) and moment direction along b in this tetragonal system͒. For Dy (T N ϭ10.6 K), Pr (T N ϭ4.0 K), and the low-temperature phase of Ho, the magnetic structure is also a commensurate antiferromagnet that consists of ferromagnetic sheets of rare-earth moments in the a-b plane, with the sheets coupled antiferromagnetically along the c axis ͓␦ϭ(0,0,1)͔. Pr is not superconducting, while for Dy (T c ϭ6 K) and Ho (T c ϭ8 K) this magnetic order coexists with superconductivity. For Ho, though, the magnetic state that initially forms at T N Ϸ8.5 K is an incommensurate spiral antiferromagnetic state along the c axis in which the direction of these ferromagnetic sheets are rotated in the a-b plane by ϳ17°from their low-temperature antiparallel configuration ͓␦ϭ(0,0,0.91)͔. The intensity for this spiral state reaches a maximum near the reentrant superconducting transition (ϳ5 K); the spiral state then collapses at lower temperature in favor of the commensurate antiferromagnetic state. An incommensurate a-axis modulation, with ␦ϭ(0.55,0,0), is also observed above the spiral-antiferromagnetic transition, but it exists over a narrower temperature range than the spiral state, and also collapses near the reentrant superconducting transition. The Er system forms an incommensurate, transversely polarized spin-density wave ͑SDW͒ state at T N ϭ6.8 K, with ␦ϭ(0.553,0,0) and moment direction along b ͑or with ␦ along b and the moment direction along a). The SDW squares up at low T, and coexists with the superconducting state (T c ϭ11 K) over the full temperature range where magnetic order is present. Tb, which does not superconduct, orders with a very similar wave vector, but the SDW is longitudinally polarized in this case and again squares up at low T. Tm orders at T N ϭ1.5 K in a transversely polarized SDW state, but with the moments along the c axis and ␦ϭ(0.093,0.093,0). This state is coexistent with superconductivity (T c ϭ11 K). No significant magnetic moment is found to develop on the Ni site in any of the materials, and there is no magnetic ordering of any kind in the Y, Yb, or Ce materials. Profile refinements have also been carried out on these same samples to investigate the systematics of the crystallography, and the crystal structure is I4/mmm over the full range of compositions and temperatures investigated. The area of the a-b plane and the volume of the unit cell both decrease smoothly with either decreasing lanthanide radius or decreasing temperature, but the strong boron-carbon and nickel-carbon bonding then forces the c axis to expand.

Research paper thumbnail of Bulk superconductivity at an elevated temperature (Tc~=12 K) in a nickel containing alloy system Y-Ni-B-C

Physical Review Letters, 1994

We report here our discovery of bulk superconductivity at rather high T c in samples having nomin... more We report here our discovery of bulk superconductivity at rather high T c in samples having nominal compositions YNi 4 BO 0.2 (T c ≊12.5 K) and YNi 2 B 3 O 0.2 (T c ≊13.5 K). While YNi 4 BC 0.2 seems to be a single phase ...

Research paper thumbnail of Molecular paper 28 -5-08

A total of thirty microsatellite molecular markers were used across 21 rice genotypes for their c... more A total of thirty microsatellite molecular markers were used across 21 rice genotypes for their characterization and discrimination. The number of alleles per locus ranged from 3 alleles (RM165, RM219, RM248, RM463, RM470 and RM517) to 9 alleles (RM223), with an average of 4.53 alleles across the 30 loci obtained in the study. The polymorphism information content (PIC) values ranged from 0.30 (RM219) to 0.84 (RM223), were identified in all 30 loci. RM223 was found the best marker for identification of 21 genotypes as revealed by PIC values. The frequency of the most common allele at each locus ranged from 24% (RM223 and RM334) to 81% (RM219). A two dimensional principal coordinate analysis (PCoA) with 21 genotypes showed that the genotypes Supper Basmoti, Basmati370 ,BasmatiD Keora, Chinisakkora, Thakurbhog, Benaful, Kolgochi , Buchi, Awnedtapl and kalijira-11 were found far away from centroid of the cluster and rest of the genotypes which placed around the centroid. The pairwise genetic dismilarity coefficient indicated that the highest genetic distance was obtained between Thakurbhog and SupperBasmoti, as well as Benaful and Keora(0.81).Basmati( SupperBasmoti, Basmati370 and BasmatiD) and Kalijira ( Kalijira 11,12,13,14) genotype had close similarity among them but showed wide dissimilarity with other local genotypes. Being grouped into distant clusters, Superbasmati, Thakurbhog, Keora and Benaful could be utilized as potential parents for the crop improvement of fine grain aromatic rice varities. Genotypes Kolgochi and Buchi (having zero dissimilarity) might be possessed same genetic background. The microsatellite marker based molecular fingerprinting could serve as a sound basis in the identification of genetically distant accessions as well as in the duplicate sorting of the morphologically close accessions.

Research paper thumbnail of MOLECULAR CHARACTERIZATION AND GENETIC DIVERSITY IN FINE GRAIN AND AROMATIC LANDRACES OF RICE (Oryza Sativa L.) USING MICROSATELLITE MARKERS

A total of thirty microsatellite molecular markers were used across 21 rice genotypes for their c... more A total of thirty microsatellite molecular markers were used across 21 rice genotypes for their characterization and discrimination. The number of alleles per locus ranged from 3 alleles (RM165, RM219, RM248, RM463, RM470 and RM517) to 9 alleles (RM223), with an average of 4.53 alleles across the 30 loci obtained in the study. The polymorphism information content (PIC) values ranged from 0.30 (RM219) to 0.84 (RM223), were identified in all 30 loci. RM223 was found the best marker for identification of 21 genotypes as revealed by PIC values. The frequency of the most common allele at each locus ranged from 24% (RM223 and RM334) to 81% (RM219). A two dimensional principal coordinate analysis (PCoA) with 21 genotypes showed that the genotypes Supper Basmoti, Basmati370 ,BasmatiD Keora, Chinisakkora, Thakurbhog, Benaful, Kolgochi , Buchi, Awnedtapl and kalijira-11 were found far away from centroid of the cluster and rest of the genotypes which placed around the centroid. The pairwise genetic dismilarity coefficient indicated that the highest genetic distance was obtained between Thakurbhog and SupperBasmoti, as well as Benaful and Keora(0.81).Basmati( SupperBasmoti, Basmati370 and BasmatiD) and Kalijira ( Kalijira 11,12,13,14) genotype had close similarity among them but showed wide dissimilarity with other local genotypes. Being grouped into distant clusters, Superbasmati, Thakurbhog, Keora and Benaful could be utilized as potential parents for the crop improvement of fine grain aromatic rice varities. Genotypes Kolgochi and Buchi (having zero dissimilarity) might be possessed same genetic background. The microsatellite marker based molecular fingerprinting could serve as a sound basis in the identification of genetically distant accessions as well as in the duplicate sorting of the morphologically close accessions.