112 research outputs found
Antimicrobial Activity and Quantum Chemical Calculations of Pyrazol-2,3-Dihydrothiazole Sugar Derivatives
A number of new [(pyrazol-4-yl) methylene] hydrazono-2,3-dihydrothiazoles, sugar hydrazones, and their N-glycoside derivatives were synthesized. The chemical structures of the synthesized compounds were confirmed by 1H NMR technique. The newly synthesized compounds were tested for their antimicrobial activities and showed moderate to high inhibition activities. Quantum chemistry calculations were used to study the molecular geometry and electronic structure of the selected derivatives. The energy gap between the highest occupied molecular orbital (HOMO)and lowest unoccupied molecular orbital (LUMO) has been calculated using the theoretical computations to reflect the chemical reactivity and kinetic stability of compounds. Keywords: 1H-pyrazole, aminothiazole, ethylchloroacetate, quantum chemical calculations, antimicrobial activity
Enhancing seed yield of hybrid rice by maintaining row ratio and dosages of gibberellic acid
The purpose of this study
was to identify the optimum levels of
gibberellic acid and suitable row ratio for
maximization the seed yield of hybrid rice.
An experiment was conducted at the
experimental farm of Rice Research and
Training Center, Egypt, during 2013 and
2014 growing seasons. The material under
this study included the parental lines of
IR69625A (Female lines) and Giza 179 R
(Restorer line) to produce F0 hybrid seeds.
A split-plot design with three replications
was used. The main plot was row ratio
(2R:8A, 2R:10A and 2R:12A) and sub plots
was the doses of gibberellic acid (g/ha)
(control, 300, 350, 400). The results
indicated that, Application of GA3 and row
ratio had significant effect on different traits
of seed yield and hybrid seed production.
The highest values of flag leaf area, panicle
length, seed set, panicle weight, panicle
exsertion and seed yield were acheived by
using 2R: 8A row ratio and was observed
the lowest values were obtained at the 2:12
row ratio. Acoording to gibberellic acid
application, the highest values for panicle
length (cm), seed set (%), panicle weight
(g), panicle exertion (%), harvest index and
seed yield were recorded by using 400 g /ha
gibberellic acid. Accordingly, the highest
net economic return from seed yield was
obtained with the treatment combination of
400 g/ha GA3 x 2:8 (R: A) row ratio
Chemical and Biological Enhancement Effects of Biochar on Wheat Growth and Yield under Arid Field Conditions
Nitrogen (N) losses are prevalent under South East Asiaâs due to high N fertilizer inputs, but low N fertilizer use efficiency. This leaves a large quantity of reactive N at risk of loss to the environment. Biochar has been found to reduce N losses across a variety of soil types, however, there is limited data available for semi-arid climates, particularly at a field-scale. Herein we present an exploration of the biological and chemical enhancement effects observed of a cotton stalk-based biochar on wheat growth and yield under arid field conditions. The biochar was treated with urea-N and biofertilizer (bio-power) in different treatment setups. The six experimental treatments included; (i) a full N dose ârecommended for wheat crops in the regionâ (104 kg N haâ1) as a positive control; (ii) a half N dose (52 kg N haâ1); (iii) a half N dose + biofertilizer (4.94 kg haâ1) as a soil mixture; (iv) a half N dose + biofertilizer as a seed inoculation; (v) a full N dose as broadcast + biochar (5 t haâ1) inoculated with biofertilizer; and (vi) a full N dose loaded on biochar + biofertilizer applied as a soil mixture. The half dose N application or biofertilizer addition as soil mix/seed inoculated/biochar inoculation with biofertilizer caused reduced wheat growth and yield compared to the control (conventional N fertilization). However, co-application of chemically enhanced biochar (loaded with a full N dose) and biofertilizer as soil mixture significantly increased the crop growth rate (CGR) and leaf area index (LAI). A significantly higher crop growth and canopy development led to a higher light interception and radiation use efficiency (RUE) for total dry matter (TDM) and grain yield (11% greater than control) production compared to the control. A greater grain yield, observed for the full N dose loaded on biochar + biofertilizer applied as a soil mixture, is attributed to prolonged N availability as indicated by greater plant and soil N content at harvest and different crop growth stages, respectively. The present study has improved our understanding of how the application of nitrogen loaded biochar and biofertilizer as soil mixtures can synergize to positively affect wheat growth and soil-nitrogen retention under arid environmental conditions.</jats:p
Re-thinking residential mobility: Linking lives through time and space.
This is the final version of the article. It first appeared from SAGE via http://dx.doi.org/10.1177/0309132515575417While researchers are increasingly re-conceptualizing international migration, far less attention has been devoted to re-thinking short-distance residential mobility and immobility. In this paper we harness the life course approach to propose a new conceptual framework for residential mobility research. We contend that residential mobility and immobility should be re-conceptualized as relational practices that link lives through time and space while connecting people to structural conditions. Re-thinking and re-assessing residential mobility by exploiting new developments in longitudinal analysis will allow geographers to understand, critique and address pressing societal challenges.Rory Coulterâs work on this paper was partly supported by an Economic and Social Research Council grant [ES/L009498/1]. Maarten van Hamâs contribution was supported by funding from the European Research Council under the European Unionâs Seventh Framework Programme (FP/2007â2013) / ERC Grant Agreement n. 615159 (ERC Consolidator Grant DEPRIVEDHOODS, Socio-spatial inequality, deprived neighbourhoods, and neighbourhood effects); and from the Marie Curie programme under the European Unionâs Seventh Framework Programme (FP/2007â2013) / Career Integration Grant no. PCIG10-GA-2011-303728 (CIG Grant NBHCHOICE, Neighbourhood choice, neighbourhood sorting, and neighbourhood effects). Allan Findlayâs work was supported by an Economic and Social Research Council grant [ES/K007394/1]
Immigrant fertility in West Germany: is there a socialization effect in transitions to second and third births?
In this paper on immigrant fertility in West Germany, we estimate the transition rates to second and third births, using intensity-regression models. The data come from the German Socio-Economic Panel Study. We distinguish women of the first and the second immigrant generations originating from Turkey, the former Yugoslavia, Greece, Italy, and Spain, and compare their fertility levels to those of West German women. In the theoretical framework, we discuss competing hypotheses on migrant fertility. The findings support mainly the socialization hypothesis: the transition rates of first-generation immigrants vary by country of origin, and the fertility patterns of migrant descendants resemble more closely those of West Germans than those of the first immigrant generation. In addition, the analyses show that fertility differentials between immigrants and women of the indigenous population can largely, though not in full, be explained by compositional differences.Dans cet article relatif Ă la fĂ©conditĂ© des immigrĂ©es en Allemagne, le passage du premier au deuxieme enfant et dans celui du deuxieme au troisieme enfant est estimĂ© Ă partir de modĂšles de rĂ©gression Ă risques instantanĂ©s. Les donnĂ©es utilisĂ©es proviennent de lâĂ©tude de Panel socio-Ă©conomique allemand. On distingue les femmes immigrĂ©es de premiĂšre ou de seconde gĂ©nĂ©ration originaires de Turquie, dâex-Yougoslavie, de GrĂšce, dâItalie et dâEspagne, et leurs niveaux de fĂ©conditĂ© sont comparĂ©s Ă ceux des femmes ouest-allemandes dâorigine. Des hypothĂšses concurrentes sur la fĂ©conditĂ© des immigrĂ©s sont discutĂ©es dans le cadre thĂ©orique. Les rĂ©sultats vĂ©rifient principalement lâhypothĂšse de la socialisation : le passage au deuxieme et au troisieme enfant de la premiĂšre gĂ©nĂ©ration dâimmigrĂ©s varie selon le pays dâorigine, et le profil de fĂ©conditĂ© par Ăąge des descendantes dâimmigrĂ©es se rapproche plus de celui des femmes ouest-allemandes que de celui des immigrĂ©es de premiĂšre gĂ©nĂ©ration. De plus, les analyses montrent que les diffĂ©rences de fĂ©conditĂ© entre les immigrĂ©es et les femmes ouest-allemandes peuvent ĂȘtre en grande partie, mais pas totalement, expliquĂ©es par des diffĂ©rences de structure
Multiplex PCR for rapid diagnosis and differentiation of pox and pox-like diseases in dromedary Camels
Vitreoretinal interface abnormalities in patients treatedwith ranibizumab for diabetic macular oedema
Phylogenetic analysis of eight sudanese camel contagious ecthyma viruses based on B2L gene sequence
FĂ©conditĂ© des immigrĂ©es en Allemagne de lâOuest: existe-t-il un effet de la socialization dans le passage du premier au deuxieme enfant et dans celui du deuxieme au troisieme enfant?
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