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Cattle Grazing Distribution and Efficacy of Strategic Mineral Mix Placement in Tropical Brazilian Pastures

GOULART, Ricardo C. D.; CORSI, Moacyr; BAILEY, Derek W.; ZOCCHI, Silvio S.
Fonte: SOC RANGE MANAGEMENT Publicador: SOC RANGE MANAGEMENT
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
35.94%
A study was conducted in Brazil to identify factors affecting grazing distribution of yearling Nelore cross heifers and to evaluate the efficacy of placement of a salt-mineral mix away from water to improve uniformity of grazing. Two pastures (25 ha and 42 ha) were evaluated for four 15-d sessions. Mineral mix was placed 590 m to 780 m from water during two sessions and at water for two sessions. Stubble heights were measured at the beginning and end of each session in 1-ha subunits of each pasture. Cattle locations were recorded oil clay 13 and 14 of each session by horseback observers. Heifers avoided areas with a preponderance of forbs and taller grass (P < 0.001). For the first 15 days of the study cattle avoided subunits farther from water. Thereafter, horizontal distance from water had no affect on grazing use (P > 0.10). Stubble height reduction was more uniform (P < 0.05) when the mineral mix was Lit water compared to away from water. In contrast, heifers spent less time farther from water when Mineral mix was placed at water (P = 0.02) based Oil Visual observations. Strategic placement of a salt-mineral mix away from water does not appear to be a reliable tool to improve cattle grazing distribution in humid tropical pastures from 25 ha to 45 ha in size.

CIRCULATION AND SALT INTRUSION IN THE PIACAGUERA CHANNEL, SANTOS (SP)

de Miranda, Luiz Bruner; Olle, Eugenio Dalle; Bergamo, Alessandro Luvizon; Silva, Lourval dos Santos; Andutta, Fernando Pinheiro
Fonte: INST OCEANOGRAFICO, UNIV SAO PAULO; SAO PAULO Publicador: INST OCEANOGRAFICO, UNIV SAO PAULO; SAO PAULO
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
35.98%
Analysis of thermohaline properties and currents sampled at an anchor station in the Piacaguera Channel (Santos Estuary) in the austral winter was made in terms of tidal (neap and spring tidal cycles) and non-tidal conditions, with the objective to characterize the stratification, circulation and salt transport due to the fortnightly tidal modulation. Classical methods of observational data analysis of hourly and nearly synoptic observations and analytical simulations of nearly steady-state salinity and longitudinal velocity profiles were used. During the neap tidal cycle the flood (v<0) and ebb (v>0) velocities varied in the range of -0.20 m/s to 0.30 m/s associated with a small salinity variation from surface to bottom (26.4 psu to 30.7 psu). In the spring tidal cycle the velocities increased and varied in the range of -0.40 m/s to 0.45 m/s, but the salinity stratification remained almost unaltered. The steady-state salinity and velocity profiles simulated with an analytical model presented good agreement (Skill near 1.0), in comparison with the observational profiles. During the transitional fortnightly tidal modulation period there was no changes in the channel classification (type 2a - partially mixed and weakly stratified)...

Circulation and salt intrusion in the Piaçaguera Channel, Santos (SP)

Miranda, Luiz Bruner de; Olle, Eugenio Dalle; Bérgamo, Alessandro Luvizon; Silva, Lourval dos Santos; Andutta, Fernando Pinheiro
Fonte: Universidade de São Paulo, Instituto Oceanográfico Publicador: Universidade de São Paulo, Instituto Oceanográfico
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
35.98%
Analysis of thermohaline properties and currents sampled at an anchor station in the Piaçaguera Channel (Santos Estuary) in the austral winter was made in terms of tidal (neap and spring tidal cycles) and non-tidal conditions, with the objective to characterize the stratification, circulation and salt transport due to the fortnightly tidal modulation. Classical methods of observational data analysis of hourly and nearly synoptic observations and analytical simulations of nearly steady-state salinity and longitudinal velocity profiles were used. During the neap tidal cycle the flood (v<0) and ebb (v>0) velocities varied in the range of -0.20 m/s to 0.30 m/s associated with a small salinity variation from surface to bottom (26.4 psu to 30.7 psu). In the spring tidal cycle the velocities increased and varied in the range of -0.40 m/s to 0.45 m/s, but the salinity stratification remained almost unaltered. The steady-state salinity and velocity profiles simulated with an analytical model presented good agreement (Skill near 1.0), in comparison with the observational profiles. During the transitional fortnightly tidal modulation period there was no changes in the channel classification (type 2a - partially mixed and weakly stratified)...

Determinação de diagramas de fases e do segundo coeficiente virial osmótico B22 na cristalização de proteínas com sal volátil carbamato de amônio; Determination of phase diagrams and osmotic second virial coefficient B22 in protein crystallization with the volatile salt ammonium carbamate

Gisele Atsuko Medeiros Hirata
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 09/12/2013 PT
Relevância na Pesquisa
36.12%
O segundo coeficiente virial osmótico, B22, tem sido considerado um preditor para o processo de cristalização. Uma faixa relativamente estreita de valores negativos de B22, -1x10-4 a -8x10-4 mL.mol/g2, é ideal à formação de cristais de acordo com George e Wilson (1994). Essa faixa de valores de B22 é denominada de "janela de cristalização", sendo utilizada para classificar condições adequadas de solvente à formação de cristais. Para valores maiores que -1x10-4 mL.mol/g2, a interação proteína-proteína não é suficientemente forte para a cristalização e nenhuma fase sólida é formada, enquanto para valores menores que -8x10-4 mL.mol/g2, as interações proteína-proteína são muito intensas e precipitados amorfos são formados. Dessa forma, os valores de B22 se tornaram um critério de seleção para a cristalização de proteínas, uma vez que esse coeficiente pode ser determinado por diversos métodos. Este trabalho teve como objetivo determinar experimentalmente diagramas de fases de proteínas (lisozima, insulina suína e bovina) e identificar nesses diagramas, através de análise dos valores do B22, as condições nas quais ocorre a formação de precipitado amorfo, cristalino ou outras fases (por exemplo...

Effect of salt additives on partition of nonionic solutes in aqueous PEG–sodium sulfate two-phase system

Ferreira, Luísa A.; Teixeira, J. A.; Mikheeva, Larissa M.; Chait, Arnon; Zaslavsky, Boris Y.
Fonte: Elsevier Publicador: Elsevier
Tipo: Artigo de Revista Científica
Publicado em //2011 ENG
Relevância na Pesquisa
36.03%
Partition of 12 nonionic organic compounds in aqueous PEG-8000–Na2SO4 two-phase system was examined. Effects of four salt additives (NaCl, NaSCN, NaClO4, and NaH2PO4) in the concentration range from 0.027 up to ca. 1.9 M on binodal curve of PEG-sulfate two-phase system and solute partitioning were explored. It was found that different salt additives at the relatively high concentrations display different effects on both phase separation and partition of various nonionic solutes. Analysis of the results indicates that the PEG–Na2SO4 ATPS with the up to 0.215 M NaCl concentration may be viewed as similar to the ATPS without NaCl in terms of the Collander equation’s predictive ability of the partitioning behavior of nonionic compounds. All ATPS with each of the salt additive used at the concentration of 0.027 M may be viewed as similar to each other as the Collander equation holds for partition coefficients of nonionic solutes in these ATPS. Collander equation is valid also for the compounds examined in the ATPS with additives of NaSCN and NaClO4 at the concentrations up to 0.215 M. The observed similarity between these ATPS might be explained by the similar effects of these two salts on the water structure. At concentrations of the salt additives exceeding the aforementioned values...

Monitoring acid-volatile sulphide by a fast scan voltammetric method: application to mercury contamination studies in salt marsh sediments

Carapuça, H. M.; Valega, M.; Pereira, E.; Duarte, A. C.
Fonte: Elsevier Masson Publicador: Elsevier Masson
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
35.94%
The present work demonstrates the application of fast scan linear sweep cathodic stripping voltammetry to the determination of acid-volatile sulphide (AVS) in salt marsh sediments. This approach combines very fast analysis with relatively high sensitivity without the need for additional reagents or derivatization procedures. The purge-and-trap AVS methodology was used. The sulphide content in the trapping NaOH solution was directly measured by voltammetry with a high scan rate (1000 mV s−1). The limit of detection (3σ) was 0.34 μmol L−1 for a deposition time of 5 s. Vertical distribution of AVS in sediments was determined in salt marsh sediments of a Portuguese coastal lagoon vegetated with H. portulacoides and correlated to the total dissolved mercury content in pore waters. At the depth of higher root biomass (around 20 cm), AVS concentrations (range 0.24–24.8 μmol g−1) were low in comparison to other depths, probably due to modifications in sediments that occur in the vicinity of the roots. The highest dissolved mercury concentrations (835 and 675 ng L−1), were found at the surface layer and at 20 cm depth, with an opposite trend from that of AVS. A possible explanation is that root activity reduced AVS concentrations at the depth of higher root biomass and resulted in elevated pore water concentrations of mercury. Concentrations of mercury in pore water from layers above and below the high root biomass were consistently lower (less than 152 ng L−1).

Changes in physiological indicators associated with salt tolerance in two contrasting cashew rootstocks

Ferreira-Silva,Sérgio L.; Silveira,Joaquim A.G.; Voigt,Eduardo L.; Soares,Lucilene S.P.; Viégas,Ricardo A.
Fonte: Brazilian Journal of Plant Physiology Publicador: Brazilian Journal of Plant Physiology
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2008 EN
Relevância na Pesquisa
36.03%
In order to identify salt tolerance indicators, several physiological variables were evaluated in two contrasting cashew (Anacardium occidentale L.) rootstocks in response to salt stress. The tolerant CCP 09 genotype showed better growth performance after two weeks under a large range of NaCl salinity (50, 100, 150 and 200 mM). The NaCl treatments induced a significant drop in transpiration as a consequence of an increased stomatal resistance in both genotypes. No significant differences in Na+, Cl, and K+ concentrations were found in both roots and leaves regardless of rootstocks. The tolerant genotype exhibited lower relative water content and less negative leaf osmotic potential as compared with the sensitive genotype and, therefore, these variables could not be related to salt tolerance. Salt stress caused more significant changes in protein and amino acid concentrations in roots than in leaves. Among the physiological indicators, leaf membrane damage was closely associated with the differences in salt tolerance between the two cashew genotypes. Furthermore, under NaCl salinity the tolerant rootstock showed greater ability to accumulate compatible organic solutes (amino acids, proline and soluble sugars) in leaves in addition to maintaining the soluble sugar concentration in roots as compared with the sensitive rootstock.

Circulation and salt intrusion in the Piaçaguera Channel, Santos (SP)

Miranda,Luiz Bruner de; Olle,Eugenio Dalle; Bérgamo,Alessandro Luvizon; Silva,Lourval dos Santos; Andutta,Fernando Pinheiro
Fonte: Universidade de São Paulo, Instituto Oceanográfico Publicador: Universidade de São Paulo, Instituto Oceanográfico
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2012 EN
Relevância na Pesquisa
35.98%
Analysis of thermohaline properties and currents sampled at an anchor station in the Piaçaguera Channel (Santos Estuary) in the austral winter was made in terms of tidal (neap and spring tidal cycles) and non-tidal conditions, with the objective to characterize the stratification, circulation and salt transport due to the fortnightly tidal modulation. Classical methods of observational data analysis of hourly and nearly synoptic observations and analytical simulations of nearly steady-state salinity and longitudinal velocity profiles were used. During the neap tidal cycle the flood (v<0) and ebb (v>0) velocities varied in the range of -0.20 m/s to 0.30 m/s associated with a small salinity variation from surface to bottom (26.4 psu to 30.7 psu). In the spring tidal cycle the velocities increased and varied in the range of -0.40 m/s to 0.45 m/s, but the salinity stratification remained almost unaltered. The steady-state salinity and velocity profiles simulated with an analytical model presented good agreement (Skill near 1.0), in comparison with the observational profiles. During the transitional fortnightly tidal modulation period there was no changes in the channel classification (type 2a - partially mixed and weakly stratified)...

Effect of different salt adaptation strategies on the microbial diversity, activity, and settling of nitrifying sludge in sequencing batch reactors

Bassin, João Paulo; Kleerebezem, Robbert; Muyzer, Gerard; Rosado, Alexandre Soares; van Loosdrecht, Mark C. M.; Dezotti, Marcia
Fonte: Springer-Verlag Publicador: Springer-Verlag
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
36.03%
The effect of salinity on the activity of nitrifying bacteria, floc characteristics, and microbial community structure accessed by fluorescent in situ hybridization and polymerase chain reaction–denaturing gradient gel electrophoresis techniques was investigated. Two sequencing batch reactors (SRB1 and SBR2) treating synthetic wastewater were subjected to increasing salt concentrations. In SBR1, four salt concentrations (5, 10, 15, and 20 g NaCl/L) were tested, while in SBR2, only two salt concentrations (10 and 20 g NaCl/L) were applied in a more shock-wise manner. The two different salt adaptation strategies caused different changes in microbial community structure, but did not change the nitrification performance, suggesting that regardless of the different nitrifying bacterial community present in the reactor, the nitrification process can be maintained stable within the salt range tested. Specific ammonium oxidation rates were more affected when salt increase was performed more rapidly and dropped 50% and 60% at 20 g NaCl/L for SBR1 and SBR2, respectively. A gradual increase in NaCl concentration had a positive effect on the settling properties (i.e., reduction of sludge volume index), although it caused a higher amount of suspended solids in the effluent. Higher organisms (e.g....

Otimização do tempo e temperatura no processamento da gipsita oriunda dos cristalizadores da produção de sal para obter gesso de uso na construção civil; Optimization of time and temperature in the processing of the gypsum from of the crystallizers of the salt production for use plaster in civil construction

Gomes, Mayara Feliciano
Fonte: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Engenharia Química; Pesquisa e Desenvolvimento de Tecnologias Regionais Publicador: Universidade Federal do Rio Grande do Norte; BR; UFRN; Programa de Pós-Graduação em Engenharia Química; Pesquisa e Desenvolvimento de Tecnologias Regionais
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
36.09%
During the process of the salt production, the first the salt crystals formed are disposed of as industrial waste. This waste is formed basically by gypsum, composed of calcium sulfate dihydrate (CaSO4.2H2O), known as carago cru or malacacheta . After be submitted the process of calcination to produce gypsum (CaSO4.0,5H2O), can be made possible its application in cement industry. This work aims to optimize the time and temperature for the process of calcination of the gypsum (carago) for get beta plaster according to the specifications of the norms of civil construction. The experiments involved the chemical and mineralogical characterization of the gypsum (carago) from the crystallizers, and of the plaster that is produced in the salt industry located in Mossoró, through the following techniques: x-ray diffraction (XRD), x-ray fluorescence (FRX), thermogravimetric analysis (TG/DTG) and scanning electron microscopy (SEM) with EDS. For optimization of time and temperature of the process of calcination was used the planning three factorial with levels with response surfaces of compressive mechanical tests and setting time, according norms NBR-13207: Plasters for civil construction and x-ray diffraction of plasters (carago) beta obtained in calcination. The STATISTICA software 7.0 was used for the calculations to relate the experimental data for a statistical model. The process for optimization of calcination of gypsum (carago) occurred in the temperature range from 120° C to 160° C and the time in the range of 90 to 210 minutes in the oven at atmospheric pressure...

Macroevolutionary patterns of salt tolerance in angiosperms

Bromham, L.
Fonte: Oxford University Press Publicador: Oxford University Press
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
36.08%
BACKGROUND: Halophytes are rare, with only 0·25% of angiosperm species able to complete their life cycle in saline conditions. This could be interpreted as evidence that salt tolerance is difficult to evolve. However, consideration of the phylogenetic distribution of halophytes paints a different picture: salt tolerance has evolved independently in many different lineages, and halophytes are widely distributed across angiosperm families. In this Viewpoint, I will consider what phylogenetic analysis of halophytes can tell us about the macroevolution of salt tolerance. HYPOTHESIS: Phylogenetic analyses of salt tolerance have shown contrasting patterns in different families. In some families, such as chenopods, salt tolerance evolved early in the lineage and has been retained in many lineages. But in other families, including grasses, there have been a surprisingly large number of independent origins of salt tolerance, most of which are relatively recent and result in only one or a few salt-tolerant species. This pattern of many recent origins implies either a high transition rate (salt tolerance is gained and lost often) or a high extinction rate (salt-tolerant lineages do not tend to persist over macroevolutionary timescales). While salt tolerance can evolve in a wide range of genetic backgrounds...

Characterization of ion contents and metabolic responses to salt stress of different arabidopsis AtHKT1;1 genotypes and their parental strains

Hill, Camilla B.; Jha, Deepa Kumari; Bacic, Antony; Tester, Mark Alfred; Roessner, U.
Fonte: Oxford University Press Publicador: Oxford University Press
Tipo: Artigo de Revista Científica
Publicado em //2013 EN
Relevância na Pesquisa
35.98%
Plants employ several strategies to maintain cellular ion homeostasis under salinity stress, including mediating ion fluxes by transmembrane transport proteins and adjusting osmotic pressure by accumulating osmolytes. The HKT (high-affinity potassium transporter) gene family comprises Na+ and Na+/K+ transporters in diverse plant species, with HKT1;1 as the only member in Arabidopsis thaliana. Cell-type-specific overexpression of AtHKT1;1 has been shown to prevent shoot Na+ overaccumulation under salinity stress. Here, we analyzed a broad range of metabolites and elements in shoots and roots of different AtHKT1;1 genotypes and their parental strains before and after salinity stress, revealing a reciprocal relationship of metabolite differences between an AtHKT1;1 knockout line (hkt1;1) and the AtHKT1;1 overexpressing lines (E2586 UAS GAL4 :HKT1;1 and J2731*UAS GAL4 :HKT1;1). Although levels of root sugars were increased after salt stress in both AtHKT1;1 overexpressing lines, E2586 UAS GAL4 :HKT1;1 showed higher accumulation of the osmoprotectants trehalose, gentiobiose, and melibiose, whereas J2731*UAS GAL4 :HKT1;1 showed higher levels of sucrose and raffinose, compared with their parental lines, respectively. In contrast, the knockout line hkt1;1 showed strong increases in the levels of the tricarboxylic acid (TCA) cycle intermediates in the shoots after salt treatment. This coincided with a significant depletion of sugars...

Salt resistant crop plants

Roy, S.J.; Negrao, S.; Tester, M.
Fonte: Elsevier Publicador: Elsevier
Tipo: Artigo de Revista Científica
Publicado em //2014 EN
Relevância na Pesquisa
35.98%
Soil salinity is a major constraint to agriculture. To improve salinity tolerance of crops, various traits can be incorporated, including ion exclusion, osmotic tolerance and tissue tolerance. We review the roles of a range of genes involved in salt tolerance traits. Different tissues and cells are adapted for specific and often diverse function, so it is important to express the genes in specific cell-types and to pyramid a range of traits. Modern biotechnology (marker-assisted selection or genetic engineering) needs to be increasingly used to introduce the correct combination of genes into elite crop cultivars. Importantly, the effects of introduced genes need to be evaluated in the field to determine their effect on salinity tolerance and yield improvement.; Stuart J Roy, Sonia Negrao, and Mark Tester

Petrography and geochemistry of Khewra Trap, a unique ultrapotassic rock in the Salt Range of Pakistan

Jan, M. Qasim; Weaver, Barry L.
Fonte: Universidade de Tubinga Publicador: Universidade de Tubinga
Tipo: Sonstiges
EN
Relevância na Pesquisa
45.9%
Abstract HKT-ISTP 2013 AO

Relationship between salt consumption measured by 24-h urine collection and blood pressure in the adult population of Vitória (Brazil)

Rodrigues,S.L.; Souza Júnior,P.R.; Pimentel,E.B.; Baldo,M.P.; Malta,D.C.; Mill,J.G.; Szwarcwald,C.L.
Fonte: Associação Brasileira de Divulgação Científica Publicador: Associação Brasileira de Divulgação Científica
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/08/2015 EN
Relevância na Pesquisa
36.05%
High salt intake is related to an increase in blood pressure and development of hypertension. However, currently, there are no national representative data in Brazil using the gold standard method of 24-h urine collection to measure sodium consumption. This study aimed to determine salt intake based on 24-h urine collection in a sample of 272 adults of both genders and to correlate it with blood pressure levels. We used a rigorous protocol to assure an empty bladder prior to initiating urine collection. We excluded subjects with a urine volume <500 mL, collection period outside of an interval of 23-25 h, and subjects with creatinine excretion that was not within the range of 14.4-33.6 mg/kg (men) and 10.8-25.2 mg/kg (women). The mean salt intake was 10.4±4.1 g/day (d), and 94% of the participants (98% of men and 90% of women) ingested more than the recommended level of 5 g/d. We found a positive association between salt and body mass index (BMI) categories, as well as with salt and blood pressure, independent of age and BMI. The difference in systolic blood pressure reached 13 mmHg between subjects consuming less than 6 g/d of salt and those ingesting more than 18 g/d. Subjects with hypertension had a higher estimated salt intake than normotensive subjects (11.4±5.0 vs 9.8±3.6 g/d...

Effective removal and fixation of Cr(VI) from aqueous solution with Friedel's salt

Dai, Y.; Qian, G.; Cao, Y.; Chi, Y.; Xu, Y.; Zhou, J.; Liu, Q.; Xu, Z.; Qiao, S.
Fonte: Elsevier Science BV Publicador: Elsevier Science BV
Tipo: Artigo de Revista Científica
Publicado em //2009 EN
Relevância na Pesquisa
36.02%
Friedel's salt (3CaO x Al2O3 x CaCl2 x 10 H2O or Ca4Al2(OH)12Cl2(H2O)4) is a calcium aluminate hydrate formed by hydrating cement or concrete in seawater at a low cost. In the current study, we carefully examined the adsorption behaviors of Friedel's salt for Cr(VI) from aqueous solution at different concentrations and various initial pHs. The adsorption kinetic data are well fitted with the pseudo-first-order Lageren equation at the initial Cr(VI) concentration from 0.10 to 8.00 mM. Both the experimental and modeled data indicate that Friedel's salt can adsorb a large amount of Cr(VI) (up to 1.4 mmol Cr(VI)/g) very quickly (t1/2 = 2-3 min) with a very high efficiency (>99% Cr(VI) removal at [Cr] < 4.00 mM with 4.00 g/L of adsorbent) in the pH range of 4-10. In particular, the competitive adsorption tests show that the Cr(VI) removal efficiency is only slightly affected by the co-existence of Cl(-) and HCO3(-). The Cr(VI)-fixation stability tests show that only less than 0.2% adsorbed Cr(VI) is leaching out in water at pH 4-10 for 24 h because the adsorption/exchange of Cr(VI) with Friedel's salt leads to the formation of a new stable phase (3CaO x Al2O3 x CaCrO4 x 10 H2O). This research thus suggests that Friedel's salt is a potential cost-effective adsorbent for Cr(VI) removal in wastewater treatment.; Yingchun Dai...

Quantitative expression analysis of TaSOS1 and TaSOS4 genes in cultivated and wild wheat plants under salt stress

Ramezani, A.; Niazi, A.; Abolimoghadam, A.; Babgohari, M.; Deihimi, T.; Ebrahimi, M.; Akhtardanesh, H.; Ebrahimie, E.
Fonte: Humana Press Inc Publicador: Humana Press Inc
Tipo: Artigo de Revista Científica
Publicado em //2013 EN
Relevância na Pesquisa
36.03%
Salt stress is a mixture of ionic, osmotic, and oxidative stresses. The expression of TaSOS1 (a transmembrane Na(+)/H(+) antiporter) and TaSOS4 [a cytoplasmic pyridoxal (PL) kinase] genes were measured in four different salinity levels and different time courses of salinity exposure using qRT-PCR technique. Mahuti (salt tolerant) and Alamut (salt sensitive) cultivars were used as cultivated wheat, and T. boeticum and Aegilops crassa as wild wheat plants. Salt-induced expression of TaSOS1 in these wild wheat plants indicates the presence of active TaSOS1 gene on the genomes A and D. The TaSOS1 and TaSOS4 transcript levels were found to be downregulated after salt treatment in all cultivars except in A. crassa, which was in contrast with its expression pattern in roots that was being upregulated from a very low-basal expression, after salt treatments. Duncan's Multiple Range Test showed a significant difference between expression in the 200-mM NaCl concentration with the 50 and 100 mM for the TaSOS1 gene, and no significant difference for TaSOS4. Lack of significant correlation between the TaSOS1 and TaSOS4 gene expressions confirms the theory that PLP has no significant effect on the expression of the TaSOS1 gene in wheat leaves.; Amin Ramezani...

CENTRIFUGE MODELLING STUDY OF CONTRASTING STRUCTURAL STYLES IN THE SALT RANGE AND THE POTWAR PLATEAU, PAKISTAN

FAISAL, SHAH
Fonte: Quens University Publicador: Quens University
Tipo: Tese de Doutorado
EN; EN
Relevância na Pesquisa
66.18%
The ENE-trending Himalayan fold-thrust belt in Pakistan exhibits contrasting deformation styles both along and across the strike. The centrifuge modelling technique has been used to investigate these variations in structural style. For the purpose of modelling, the Salt Range and Potwar Plateau (SR/PP) stratigraphy has been grouped into four mechanical units. From bottom to top these are the Salt Range Formation, carapace unit (Cambrian-Eocene platform sequences), Rawalpindi Group, and Siwalik Group. These stratigraphic units of alternating competence, composed of thin layers of plasticine modelling clay and silicone putty, rest on a rigid base plate that represents the crystalline basement of the Indian plate. The models are built at a linear scale ratio of ~10-6 (1mm=1km) and deformed in a centrifuge at 4000g. The models are subjected to horizontal shortening by collapse and lateral spreading of a “hinterland wedge” which simulates overriding by the Himalayan orogen (above the Main Boundary Thrust). The models of the central SR/PP show that the accretionary wedge develops a prominent culmination structure with fault-bend fold geometry over the frontal ramp, while the eastern SR/PP is more internally deformed by detachment folds...

Evidence Linking Alterations in the Moment-to-Moment Pressure-Natriuresis Mechanism to Hypertension and Salt-Sensitivity in Rodents

Komolova, Marina
Fonte: Quens University Publicador: Quens University
Tipo: Tese de Doutorado
EN; EN
Relevância na Pesquisa
36.04%
Hypertension and salt-sensitivity are independent risk factors for cardiovascular disease. Although both conditions are idiopathic, they develop due to a complex interplay between susceptibility genes and environmental factors. Given that the kidney plays an important role in regulating blood pressure, in particular, by maintaining sodium and water balance via pressure-natriuresis, it is not surprising that disturbances in the proper functioning of this intrarenal mechanism have been linked to these conditions. Although direct coupling of changes in renal arterial pressure (RAP) to renal interstitial hydrostatic pressure (RIHP) and consequent sodium excretion is well established, few studies have characterized the moment-to-moment aspects of this process. Thus, the main focus of the research presented herein was to characterize the moment-to-moment RAP-RIHP relationship, and assess the functioning of this intrarenal mechanism in various animal models of genetic and environmentally-induced hypertension and/or salt-sensitivity. In adult normotensive rats, the response time of RIHP to acute changes in RAP was rapid (<2 seconds), and the moment-to-moment RAP-RIHP relationship was linear over a wide range of pressures. Additionally...

Short range order in new rock salt type structures of the system Li3NbO4-CoO

Vega-Glez,M.; Castellanos Román,M.A.; Huanosta-Tera,A.
Fonte: Sociedad Mexicana de Física Publicador: Sociedad Mexicana de Física
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2005 EN
Relevância na Pesquisa
35.98%
Synthesis of compounds belonging to the system Li3NbO4-CoO has been obtained by a solid state reaction, the products are appropriately described by the formula Li(3-3x)Co4xNb(1-x-)O4; 0 ≤ x ≤ 1. These new compounds have been studied in their diffraction features. Their electron diffraction patterns are characterized by the existence of a well defined diffuse intensity distribution in addition to sharp Bragg reflections of a rock salt type structure. This has been attributed to the presence of atomic short range order in the structure. As the amount of Co²+ ions increases in the structure, the amount of grains which produces diffuse scattering becomes larger therefore, we propose that the presence of Co2+ drives local spatial cation distribution which would rise electron diffuse scattering. An explanation, in terms of a modulated structure, has been put in advance depicting a probable atomic arrangement to explain the detected short range order.