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Copyright of Avances is the property of Instituto de Informacion Cientifica y Tecnologica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

At the El Mambí vegetable canning factory, in Camagüey, the generation of wastewater is approximately 36 930.0 m3/year. The main generating sources are those linked to production and auxiliary services. These waters have a high polluting load. The objective of this work is to design a wastewater treatment technology, which allows compliance with the standards for dumping their pollutant load, through the integration of physical, chemical and biological methods. These waters were characterized at the Camagüey Environmental Engineering Center. The plant was designed in two lines: the one for wastewater and the one for produced sludge. The optimal dilution rate calculated in the aerator allows maximum removal productivity to be achieved. The estimated total investment cost amounts to $ 4 437 675, 51. The technical-economic evaluation of the variant for twenty years indicates a favorable decision in terms of making the investment, with a net present value (NPV) of $ 3 137 816,25; internal rate of return (IRR) of 23,51 % and (PRI) 4,25 years, which shows an adequate value according to the current trend of recovery of investments. [ABSTRACT FROM AUTHOR]

Copyright of Ingeniería (0121-750X) is the property of Ingenieria and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Veterinaria is the property of Universidad Nacional del Nordeste and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The southernmost populations of Salix humboltiana are located in the Chubut River area of Argentina. However, its distribution area in the longitudinal and transverse gradient of the river system, the density of individuals, and the structure of the populations, among other aspects, are still unknown. A survey of S. humboldtiana and its hybrids with the invasive willow Salix x fragilis was carried out in the upper and middle courses of the Chubut River. For each individual greater than 5 cm DBH, location, sex, diameter, height, canopy status and hydro-geomorphological context were recorded. The DBH/height relationship, sex ratio, natural hybridization frequencies, and the relationship between DBH, height and canopy status with the different hydro-geomorphological elements and their activity (functional / afunctional) were analyzed. 41 populations with a total of 492 individuals of S. humboldtiana were recorded between Costa del Chubut and Paso de Indios. S. humboldtiana sapling recruitment was exclusively associated with functional hydrogeomorphological elements. 12 % of the populations presented a balanced sex ratio, and 2.5 % of individuals were female hybrids between S. humboldtiana and S. x fragilis. Hybridizations with S. x fragilis contribute to a process of gene dilution and degradation of S. humboldtiana populations. [ABSTRACT FROM AUTHOR]

We recorded the presence of an individual of Ruddy Duck (Oxyura jamaicensis) with diluted plumage and two of the Northern Shoveler (Spatula clypeata), one with progressive graying and another one with partial leucism in Lake Nabor Carrillo, Texcoco, State of Mexico. These observations represent the first records of aberrant coloration for these species in Mexico. Documenting such cases can help to understand the frequency of chromatic aberrations, as well as mechanisms of speciation in different groups of birds. [ABSTRACT FROM AUTHOR]

Copyright of Ius et Praxis (07172877) is the property of Universidad de Talca and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The effect of welding current on the chemical composition and microstructure of Fe-Cr-C deposits obtained by SMAW and used for working under abrasive and erosive wear conditions was evaluated. Chemical composition of the deposit without dilution was determined and microstructure of the deposits was obtained with and without dissolution. The dilution coefficient was determined based on the geometry of the deposits and the chemical composition of the deposits for different welding currents based on it. It is concluded that all the deposits respond to the AWS EFeCr-A4 designation, characterized by a high predominance of eutectic, being suitable for working in conditions of abrasive and erosive wear. As the current increases, the content of alloying elements decreases due to dilution. The deposit obtained with a 110 A current is considered more appropriate, because 90 A current has very little penetration, which makes adherence difficult. [ABSTRACT FROM AUTHOR]

Copyright of Foro Internacional is the property of El Colegio de Mexico AC and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Introduction: There is a problem of recovering parts with large worn surfaces in industry. Filling is applied by manual electric arc welding for this, with low productivity when using small diameters cylindrical electrodes, operated with low current intensities. Objective: To evaluate operating and melting behavior of a coated electrode with a rectangular section core and a rutile coating. Materials and methods: Rutile coating was applied by pressing in molds. Operational performance was qualitatively evaluated by applying expert criteria. In addition, the consumption parameters were determined according to the standard (ISO 2401-72, 1972). The effect of core width and current intensity on consumption and dilution parameters was experimentally determined. Statistical processing was carried out with Statgraphics software. Results and Discussion: Electrodes have good operating properties as excellent arc stability is obtained in 77.8% of them, excellent slag detachment in 100%, good appearance and cord health in 77% and 88.9% respectively. The average deposition coefficient was 0.16 g/A*min, deposition efficiency of 80.6% and dilution of 30.5%. Conclusions: Obtained electrodes showed good operating behavior during welding tests, which allows the filling process in parts affected by wear. Dilution in deposited by these electrodes metal is less than in equivalent cylindrical electrodes, which constitutes a significant advantage in recharge processes. [ABSTRACT FROM AUTHOR]

Copyright of Tropelías: Revista de Teoría de la Literatura y Literatura Comparada is the property of Prensas Universitarias de Zaragoza and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The present paper describes the influence of compost/solvent relations on pH and electric conductivity (CE) measurements, using water and CaCl2 0.01 M as extractants, in the extract suspension as well as in centrifuged supernatant. According to the results, pHCaCl2 seems to be more independent of extractant quantity, contrarily to aqueous extract measurements, which increases with dilution, described by a quadratic model. As a consequence, measurement must be performed where the curve slope is minimum or null, and where the measurement becomes independent of extractant quantity. For aqueous extract, it happens at relations compost/extractant greater than 1:8, and for CaCl2 extracts, greater than 1:5. pHH2O is higher than pHCaCl2 showing that CaCl2 is a better acidity extractant. EC measurements also show polynomical behavior, therefore must be performed on relations compost/extractant greater than 1:6, where EC values are more independent of extractant quantity. EC could be performed in CaCl2 extract, suspension or supernatant, with respective blank correction. [ABSTRACT FROM AUTHOR]

From all strains of Staphylocccus aureus stored in the Bacterial Resistance Laboratory ceparium of IIBCAUDO, fourteen strains were analyzed to determine the decreasing susceptibility to vancomycin. Sixty four percent of strains grew on vancomycin screening. MIC vancomycins were between 1 and 2 mg/L by microdilution method. MIC agar dilutions were 2 and 4 mg/L. MBC were 2 and 4 mg/L. None of the strain was tolerant. No hVISA strains with PAPAUC method was detected. We suggest vancomycin screening for all strains isolated from sterile sites. [ABSTRACT FROM AUTHOR]

The purpose of this work is to establish the elements that condition and identify the intercalations of low ore grade, which are the cause of internal dilution, for further separation during mining operations. By observing and interpreting the geological and geochemical data pertaining the pits and the mining fronts, it was possible to differentiate the various elements that include the parameters and factors associated to the internal dilution according to their geological or mining nature. The geochemical parameters and factors of the geological component are the ones that best characterize the intercalations based on the drill samples. In contrast, the field control within the mining component is the one that allows identifying (and separating) better the intercalations immediately after the ore is fed to the industrial process in accordance to the selective potential of the mining technology and existing digging equipment. [ABSTRACT FROM AUTHOR]

The aim of this study was to evaluate the method of the Limulus amebocyte lysate (LAL) in its kinetic chromogenic variant for the determination of bacterial endotoxins in infant succinylcholine injection 100 mg. This variant do a monitoring of the color development across time and uses a standard curve plotted for the reaction time according to the known endotoxin, in the range of 0.005 to 50 EU / mL concentration. The rating analyst for reliable results was confirmed by the standardization of the method. It was carried out the characterization of the product being obtained 1:8000 as dilution factor when calculating the maximum valid dilution. The selection of the working dilution was evaluated in preliminary inhibition and enhancement testing and 1:4000 have being defined as the optimal dilution. The chosen dilution was validated in three consecutive batches of the product and the percentages observed in all cases recovered framed in the limits (50-200%) and lower coefficient of approved acceptance criteria for this parameter variation. The method was applied to the three pilot batches. In the conclusion we can state that it was shown that this standardization and validation allow its application as a routine test for determination of bacterial endotoxins as part of the quality control and stability study of this product. [ABSTRACT FROM AUTHOR]

Salmonella enterica subsp. enterica is one of the most interesting bacteria because of its pathogenic effect on animals. The objective of the present study was to evaluate the in vitro effect of furan acetamide bromide (FAB) on avian Salmonella enterica. FAB was obtained from the Centro de Bioactivos Químicos of the Universidad Central de las Villas, Cuba. The antimicrobial activity of the product against Salmonella enterica isolates was determined by the broth macrodilution method, according to the Committee for Clinical Laboratory Standards (NCCLS), document M7-A2. The minimum lethal concentration was determined by NCCLS, document M26-A, 1999. The biochemical and serological tests confirmed the presence of Salmonella gallinarum in 100% of the samples. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) values of FAB were 12.5 µg/ml for Salmonella gallinarum and American Type Culture Collection (ATCC) of E. coli. It is concluded that MIC and MBC of Salmonella enterica against in vitro effect of furan acetamide bromide was 12.5 µg/ml, demonstrating the antimicrobial activity of the product. [ABSTRACT FROM AUTHOR]

Introduction. The composition of the extenders for cryopreservation of stallion semen is crucial in cryotolerance and post-thaw fertilizing capacity of sperm cells. Objective. Evaluate two extenders for freezing the semen of Colombian creole stallions. Materials and methods. Semen of four Colombian creole stallions was cryopreserved by fast freezing protocol with Equipro® and Gent® extenders. Evaluation of sperm post-thaw motility was performed by a Sperm Class Analyzer system (SCA®) to examine total motility (TM), progressive motility (PM), velocity curvilinear (VCL), velocity straight line (VSL) and velocity average path (VAP). The sperm vitality (SV) and normal morphology (NM) were assessed by eosin-nigrosin staining; the plasmatic membrane integrity was determined by the hypo-osmotic swelling test (HOS). For statistical evaluation were adjusted generalized linear models (GLM) and the treatments averages were compared by the Tukey test. Associations between variables were assessed by Pearson correlation analysis. Results. Statistical difference (P≤ 0.05) was found for TM with averages of 50.9% ± 19.4% and 42.2% ± 15.1% for Equipro ® and Gent®, respectively. Except for VSL no difference was found between the other evaluated parameters. There was a high association between motility parameters, vitality and membrane integrity. Conclusions. Equipro® extender produces superior post-thaw total motility rates than Gent® extender in sperm of Colombian creole stallions. [ABSTRACT FROM AUTHOR]

In this work, the NiCoCrAlYTa Alloy was deposited by laser cladding with different processing parameters (flow rate of powder supplied, feed speed and laser power), in order to analyze the effects of processing on the geometry, microstructure and properties of the coating. We have measured the dimensions of the tracks by optical microscopy and computer image analysis. Scanning electron microscopy (SEM) and energy dispersive spectroscopy microanalysis (EDS) have been used to analyze the microstructure, chemical composition and microhardness variations. The coatings exhibit good geometric aspect ratio without cracks and macro pores, and a good metallurgical bond with the substrate through the dilution zone was obtained; yet there is no a homogeneous columnar dendrite structure that depends on the processing laser. It has been observed that the surface hardness of the coating is twice that of the substrate hardness. The EDS microanalysis evidenced the dilution and mixing of relevant chemical elements such as Fe, Co, Al and Ta with Ni-Cr, generating a gradual variation between substrate and coating which influences the hardening observed at the interface. [ABSTRACT FROM AUTHOR]

Copyright of Revista Iberoamericana de Micologia is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

At the paper it is reported the effect of coated factor in the behavior of coated tubular electrodes for hardfacing by SMAW of components of the sugar industry, as to consumption parameters and the geometry of the deposited metal. The electrodes were made with different coating thickness for a fixed diameter of the metal tube and coating composition, in order to value the exclusive influence that the thickness has. Each coating factor (relation between the total diameter of the electrode and the diameter of the metal tube) was evaluated as a function of the variation in welding current. Deposits over the metal plate were made, letting evaluate the geometrical dimensions of the welding bead and the consumption parameter of electrodes. Was concluded that for those electrodes the value of the coating factor have to be 1,2 and showing the best integral performance for the hardfacing of pieces around an average welding current of 100 A. [ABSTRACT FROM AUTHOR]

Copyright of Revista Colombiana de Biotecnología is the property of Universidad Nacional de Colombia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Española de Quimioterapia is the property of Sociedad Espanola de Quimioterapia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Colombiana de Biotecnología is the property of Universidad Nacional de Colombia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Española de Quimioterapia is the property of Sociedad Espanola de Quimioterapia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Fuentes, El Reventón Energético is the property of Universidad Industrial de Santander and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This work provides a set of volumetric data to evaluate the influence of the concentration and the temperature on the molecular interactions between N, N-Dimetilformamida (DMF) and water. Densities of binary aqueous mixtures of N, N-Dimethylformamide (DMF) were measured over the entire composition range at constant pressure of 98.93 kPa and at temperatures from 293,15K and 313,15K using a vibrating-tube densimeter. Excess molar volumes and partial molar volume at infinite dilution were also calculated. The partial molar volumes at infinite dilution of DMF in aqueous solution were obtained by extrapolation at each temperature. The excess molar volumes were calculated from density data and fitted to the Redlich-Kister polynomial equation. The DMF presents a hydrophobic behavior similar to other organic solutes in water such alcohols and polyols. [ABSTRACT FROM AUTHOR]

It is carried out the determination of geometry of deposits of coated tubular electrodes for hardfacing of pieces in sugar industry. Two versions of coated tubular electrodes (ferroalloy particle size in the soul d"0,1 mm and in the range of 0,1- 0,25 mm) are evaluated. This study is made in comparative way, using the DIN E60-10Z commercial coated electrode, which has same diameter (4mm) and same application (hardfacing, widely applied in sugar industry) as this studied. The Coefficient of Dilution is obtained as the ratio of penetration area and total fused area. Starting of the dilution is obtained the composition of alloy elements in the deposits. [ABSTRACT FROM AUTHOR]

The objective of this research project was to determine the ruggedness of aerobic plate count when modifying the serial dilution step. experiments were performed in 2006 at the Food microbiology Laboratory at the Food science and Technology national center. Effects of matrix (vegetables, Italian sausage and milk), inoculation level (high:106/g or 106/ml or low:10³/g or 10³/ml) and dilution method (10 ml:90 ml or 1 ml:9 ml sample:diluent ratio) on the aerobic plate count of inoculated samples were evaluated. None of the effects and their interactions were significant showing high ruggedness of the method when the serial dilution step was modified. Dilution 10:90 can be substituted for a 1:9 dilution. in turn less resources are needed, homogenization is easier for a lower volume and manipulation and washing of tubes (9 ml) more convenient than bottles (90 ml). [ABSTRACT FROM AUTHOR]

In this work is carried out the evaluation of hardfacing welds obtained by shielded metal arc welding process (SMAW) using the CIS1 experimental tubular electrodes, for the recovery or production of sugar cane knives. The welds are studied from the metallographical point of view, analyzing the effect of the piece geometry in the microstructural characteristic, in the dilution coefficient and consequently in their abrasive wear resistance. [ABSTRACT FROM AUTHOR]

This document exposes: 1) A brief reminder of the process for the extraction of phosphoric acid from phosphoric rock by extraction with dilute sulfuric acid in a battery of Dorr thickeners in countercurrent; 2) a mass balance for P2O5 leads to a Riccati finite differences equation which governs the enrichment in acid concentration (Cn) in the tank number n; 3) the solution of the equation with technical initial conditions and economic restrictions gives the explicit function Cn = F (n); 4) the inverse function F-1 (Cn) = n gives the necessary, sufficient, and most economic number of tanks. No need of graphic, approximate methods neither of trial-and-error, as Unit Operations textbooks teach usually. [ABSTRACT FROM AUTHOR]

In order to have different extenders for equine semen, ejaculates of eight creole horses were evaluated The evaluation criterion was the initial progressive motility. The extenders evaluated were: (Texas, Dimitropoulos-II and Burns), in a dilution 1:1, being the spermatic motility with each extender of: 71±.13%, 68±,16%, and 71±.13%. Subsequent to the dilution-freezing process, the following motilities were observed: Texas 64±13%, Dimitropoulos-II 61±17% and Burns 65±.16%. There was no a significant statistical difference (P<0.05) of the post-defrosted motility among the three extenders (Texas 31±,09%, Dimitropoulo-II 32±,10% and Borns 36±,10%). The correlation between the initial motility and the post defrosted one was of 0,8 in Burns, 0,7 in Dimitropoulos-II and 0,6 in Texas. It is considered that all the extenders evaluated can be used for the dilution of equine semen [ABSTRACT FROM AUTHOR]

Nephrotic syndrome has been associated with defects in the urine concentration and dilution process in humans and animals. Contrary to other clinical situations, as in heart failure and hepatic cirrhosis, in which an increment in the renal expression of aquaporins has been demonstrated, diverse studies have shown a decrease in the renal expression of aquaporins after the inducement of nephrotic syndrome, giving an explanation for the failure to concentrate urine. The suppression of the expression of transporters is not limited to aquaporins, but to other fundamental transporters for the urine concentration and dilution process, altering the operation of the countercurrent multiplier mechanism. The defects in the urinary dilution process are related to the decrease in the expression of diverse transporters as well as in the reduction in the glomerular filtration. [ABSTRACT FROM AUTHOR]

Free radicals scavengers of ethanolic and aqueous extracts from Pinus ayacahuite, Pinus cooperi, Pinus durangensis, Pinus leiophylla and Pinus teocote bark were evaluated, using the diphenylpicrylhydrazyl (DPPH) radical assay, to extract concentrations of (250, 500, 750, 1000 and 1250) mg L-1. The scavengers were compared with butilhydroxitoluene (BHT) and butilhydroxianisol (BHA). Ethanolic extracts had higher activity than the aqueous one, specially P. leiophylla and P. durangensis, with scavengers at 500 mg L-1 of (90,4 ± 0,98) % and (83,0 ± 1,41 ) %, similar to BHA (83,6 ± 0,20) % and higher than BHT (50,3 ± 0,72) %. Other than P. cooperi all extracts showed scavengers higher to 90,9 % at 1250 mg L-1. The concentration for scavengers 50,0 % of radical (CE50) was evaluated. The antimicrobial activity of the extracts was evaluated using agar dilution method against Staphylococcus aureus. Enterococcus sp., Escherichia coli and Pseudomonas aeruginosa to concentrations of (0,625, 2,5, 5,0, 10,0 and 20,0) mg/mL. The minimal inhibitory concentration (MIC) was reported Ethanolic extracts had higher activity than the aqueous one. S. aureus was the most inhibited (MIC 0,625 mg/mL), Enterococcus sp moderaty inhibited (MIC 2,5 mg/mL), E. coli do not had a good inhibition (MIC 10,0 to 20,0) mg/mL. P. aeruginosa only was efficiently inhibited by P. cooperi (2,5 mg/mL) ethanolic extract. [ABSTRACT FROM AUTHOR]

Microorganism resistance to antibacterial drugs is a health problem throughout the world, for that reason it is necessary to find new therapeutic alternatives from natural sources. Propoaromiel (PHO) is a mixture of honey, propolis and essential oils. The objective of this work was to evaluate the in vitro antibacterial activity of PHO against 239 microorganisms isolated from clinical samples: S. aureus (N= 53); S. pneumoniae (N = 37) and S. B. hemoliticcus (N = 49) N. meningitidis (N= 42); M. catarrhalis (N=5). P.aeruginosa (N= 37); E. coli (N=5); Salmonella sp (N=8); Proteus sp (N=2) and Hafnia (N=1). The in vitro activity was tested by minimum inhibitory concentration (MIC) using the agar dilution method according to the National Committee for Clinical Laboratory Standards Guidelines (NCCLS). All the microorganism suspensions were adjusted to a 0.5 MacFarland standard. To determine MIC, PHO two-fold dilutions were prepared ranging from 5.07 to 650 mg/ml. Muller Hinton Agar plates containing 5% sheep blood were used for bacterial growth. The plates were incubated 24 hours at 37°C in 5% CO2 humid atmosphere. N. meningitidis and S. pneumoniae strains showed the highest sensitivity (MIC90 30,4mg/ml). On the other hand, S.aureus (MIC90 243,7mg/ml) and Gram negative bacilli (MIC90 243.7mg/ml) were more resistant to PHO activity. PHO displayed antibacterial activity against all the strains studied. [ABSTRACT FROM AUTHOR]

An indirect quantitative ELISA was developed for the evaluation of the immune response elicited by Pseudomona aeruginosa vaccine candidates, and for obtaining hyperimmune immunoglobulins to be used in the medical treatment. Standard and control sera were made, and the optimal LPS coating dilution of the polystyrene plates, and the sample and conjugate dilutions were established. A 1.5 µg/mL concentration of O11 LPS in PBS, incubated for 16-20 h at 4°C were found to be the best coating conditions. The blocking step was unnecessary. A 1:100 dilution for the serum samples and 1:3000 for the anti-human IgG:HRP conjugate were selected. Accurate quantitative determinations were possible in the lineal range of the standard curve. [ABSTRACT FROM AUTHOR]

Local recharge shows very active dynamics in the zone of La Muralla. During the rainy season it generates most of the hydraulic charge in the south of the area producing flows towards the north. Nevertheless, during the dry season, the gradient is inverted producing a larger hydraulic charge in the north. The interaction of local and regional flows plays a very important role in the hydro-geochemical evolution of the wells. When recharge dominates, the dilution causes a decrease in the hydrogeochemical level, and during the dry season, the influence of deep flows that increase the hydrogeochemical concentration prevails. Well established variations in values of lithium, fluoride, chloride, and sodium allow differentiation of these two groups. Group A, where the northern wells are located, is related to deep flows, showing a higher concentration of hydrogeochemical components. Group B, located in the south, is associated with local recharge and shows low concentrations of these parameters. [ABSTRACT FROM AUTHOR]

Copyright of Medicina Oral (16656024) is the property of Colegio Nacional de Cirujanos Dentistas Militares A.C. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Española de Quimioterapia is the property of Sociedad Espanola de Quimioterapia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Se propone un modelo alternativo para predecir el comportamiento de los solutos en agua a partir de la teoría de la contribución de Interacciones de Grupos (GIC por sus siglas en inglθs). El nuevo modelo ofrece mejores predicciones que otros mθtodos tradicionales y ofrece la ventaja de considerar la estructura química y los fragmentos moleculares.