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  • 1
    Electronic Resource
    Electronic Resource
    Kinetic spectrophotometric method for analyzing mixtures of metal ions by stopped-flow injection analysis using partial least-squares regression (1994)
    s.l. : American Chemical Society
    Analytical chemistry 66 (1994), S. 2905-2911 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00090a018
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  • 2
    Electronic Resource
    Electronic Resource
    Salinity effects on water relations in Lycopersicon esculentum and its wild salt-tolerant relative species L. pennellii (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 83 (1991), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Cultivated tomato Lycopersicon esculentum (L.) Mill. cv. P-73 and its wild salt tolerant relative L. pennellii (Correll) D'Arcy accession PE-47, were grown during spring-summer 1989 under unheated plastic greenhouse conditions. Plants were submitted to two different salt treatments using 0 and 140 mM NaCI irrigation water. In both tomato species, salinity caused a proportionally larger reduction in leaf area than in leaf weight and, in L. esculentum, a proportionally larger decrease in stem weight than in leaf weight. Daily variations in leaf water potential (Ψ1) were fundamentally due to changes in the evaporative demand of the atmosphere. Reductions in Ψ1 due to salinity were consistent only in L. esculentum. In all the conditions studied, leaf turgor was maintained. Leaf conductance (g1)was higher in L. esculentum than in L. pennellii.Salinity induced a clear reduction in g1 levels in L. esculentum whereas, in L. pennellii, this reduction was noted only in May. In both species the Ψos (leaf osmotic potential at full turgor) levels were reduced by salinity. The bulk modulus of elasticity (E) and relative water content at turgor loss point (RWCtlp) were not affected by salinity. The RWCtlp values in L. pennellii seem to be controlled by E values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1991.tb02152.x
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  • 3
    Electronic Resource
    Electronic Resource
    Revision of the antigenic structure of genus Listeria (1990)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 67 (1990), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: O-antigenic structure of genus Listeria was studied, using antisera (obtained from rabbits) against different O-antigens of reference strains of each serovar. The titres of sera were determined by agglutination using antigens of the same reference strains as well. Some differences from the actual scheme were found: serum antifactor-IX gave a lower titre than expected against antigens 4ab and 6b, while the titre observed against antigen 4b was higher than the expected in this case. Serum antifactor-VIII presented a higher titre than could be expected against antigen 6b. The strains of serovars 4d and 4e used in this experience were impossible to distinguish, and could have been classified in the same serovar. We could not obtain serum antifactor-XI factor from serovar 6b after several trials. From these differences we propose some modifications of the current antigenic scheme of genus Listeria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1990.tb13846.x
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  • 4
    Electronic Resource
    Electronic Resource
    Water relations and osmotic adjustment in Lycopersicon esculentum and L. pennellii during short-term salt exposure and recovery (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 89 (1993), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Cultivated tomato Lycopersicon esculentum (L.) Mill. cv. P-73 and its wild salt-tolerant relative L. pennellii (Correll) D'Arcy accession PE-47 growing on silica sand in a growth chamber were exposed to 0, 70, 140 and 210 mM NaCl nutrient solutions 35 days after sowing. The saline treatments were imposed for 4 days, after which the plants were rinsed with distilled water. Salinity in L. esculentum reduced leaf area and leaf and shoot dry weights. The reductions were more pronounced when sodium chloride was removed from the root medium. Reduction in leaf area and weight in L. pennellii was only observed after the recovery period. In both genotypes salinity induced a progressive reduction in leaf water potential and leaf conductance. During the recovery period leaf water potential (ψ1) and leaf conductance (g1) reached levels similar to those of control plants in wild and cultivated species, respectively. Leaf osmotic potential at full turgor (ψos) decreased in the salt treated plants of both genotypes, whereas the bulk modulus of elasticity was not affected by salinity. Leaf water potential at turgor loss point (ψtlp) and relative water content at turgor loss point (RWCtlp) appeared to be controlled by leaf osmotic potential at full turgor (ψos) and by bulk modulus of elasticity, respectively. At lowest salinity, the wild species carried out the osmotic adjustment based almost exclusively on Cl− and Na+, with a marked energy savings. Under highest salinity, this species accommodate the stress through a higher expenditure of energy due to the contribution of organic solutes to the osmotic adjustment. The domesticated species carried out the osmotic adjustment based always on an important contribution of organic solutes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1993.tb05196.x
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  • 5
    Electronic Resource
    Electronic Resource
    Simultaneous spectrophotometric determination of Zinc(II) and Nickel(II) with 1-(2-pyridylazo)-2-naphthol (1992)
    Springer
    Microchimica acta 108 (1992), S. 53-59 
    Details
    ISSN: 1436-5073
    Keywords: multiwavelength spectrophotometry ; multicomponent analysis ; Zn-Ni determination ; UV-Vis spectrophotometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new procedure for the simultaneous spectrophotometric determination of Zn(II) and Ni(II) with 1-(2-pyridylazo)-2-naphthol as chromogenic reagent has been developed. It is based on resolution of the mixed spectrum over the wavelength range 530–590 nm by applying a least-squares fitting program to standard spectra from each component. The spectra are recorded at an apparent pH of 5.0, provided by an acetate buffer in a mixed 60∶40 v/v 2-ethoxyethanol/water medium. The relative standard deviations for determination of 13.7 μg of Ni and 31.0 μg of Zn were 1.9 and 1.0%, respectively (8 replications). The method has been applied to the analysis of iron surfaces coated with a Zn-Ni alloy. The results are compared with those obtained by atomic-absorption spectrophotometry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01240371
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  • 6
    Electronic Resource
    Electronic Resource
    l-Ascorbic acid release from phema hydrogels (1993)
    Springer
    Polymer bulletin 31 (1993), S. 577-584 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Controlled release of L-ascorbic acid from poly(2-hydroxyethyl methacrylate) (PHEMA) hydrogels is reported. PHEMA hydrogels were synthesized from 2-hydroxyethyl methacrylate (HEMA) monomer in an oven. We studied the swelling of PHEMA discs in water as a fuction of temperature and thickness of xerogel discs. The fractional swelling was linear in (time)1/2 at short times. Drug release has been examined as a fuction of temperature, initial drug load and thickness of the PHEMA discs. The fraction of avaible drug release was linear in (time)1/2 during the initial stage too. The release experiments were carried out at 308 K. These studies allow to determinate a diffusion coefficient for transport of water into the hydrogels and a diffusion coefficient for L-ascorbic acid release from the hydrogel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00297895
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  • 7
    Electronic Resource
    Electronic Resource
    Growth and osmotic adjustment of two tomato cultivars during and after saline stress (1994)
    Springer
    Plant and soil 166 (1994), S. 75-82 
    Details
    ISSN: 1573-5036
    Keywords: growth ; osmotic adjustment ; saline stress ; solutes ; Lycopersicon esculentum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effect of a short period of saline stress was studied in two phenotypically different cultivars, one of normal fruit-size (L. esculentum cv. New Yorker) and one of cherry fruit-size (L. esculentum var.cerasiforme cv. PE-62). In both cultivars the relative growth rate (RGR) and the leaf area ratio (LAR) decreased following salinisation. The leaf turgor potential (ψp) and the osmotic potential at full turgor (ψos) decreased to the same extent in both cultivars. However, the contributions of organic and inorganic solutes to the osmotic adjustment was different between cultivars. New Yorker achieved the osmotic adjustment by means of the Cl− and Na+ uptake from the substrate, and by synthesis of organic solutes. In the cherry cultivar organic solutes did not contribute to the osmotic adjustment, instead, their contribution decreased after salinisation. After the salt stress was removed, the water stress disappeared, the content of organic solutes decreased in plants of both cultivars and, therefore, their growth was not retarded by the diversion of resources for the synthesis of organic solutes. However, the toxic effects of the Cl− and Na+ did not disappear after removal of the salt stress, and the net assimilation rate (NAR) and the rate of growth (RGR) did not recover.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02185483
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  • 8
    Electronic Resource
    Electronic Resource
    Carbohydrate and protein histochemistry during oogenesis inHalobatrachus didactylus (Schneider, 1801) from the Bay of Cadiz (Spain) (1992)
    Springer
    Journal of molecular histology 24 (1992), S. 337-344 
    Details
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Histological and histochemical characteristics were studied inHalobatrachus didactylus (Schneider, 1801) during oogenesis. Three phases could be differentiated: previtellogenesis (oogonia and basophilic oocytes), vitellogenesis (yolk synthesis) and maturation-spawning. Glycogen, glycoproteins and proteins rich in certain amino acids were present in the previtellogenic as well as in the vitellogenic cytoplasm oocytes. No acid mucosubstances were detected. Three types of yolk (vesicles, vacuoles and granules) contained different types of organic reserves; granules were essentially proteic whereas globules were lipidic. Carbohydrates and proteins were present in vesicles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01046165
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  • 9
    Electronic Resource
    Electronic Resource
    Diode array detectors in flow injection analysis. Simultaneous determination of rare earth metals with Arsenazo III (1990)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 338 (1990), S. 831-835 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A flow injection spectrophotometric procedure for the simultaneous determination of rare earths with Arsenazo III is reported. The spectrum of the sample is recorded by using a diode array detector and the mixed spectra are resolved with the aid of a multicomponent analysis program based on a least-squares fitting algorithm. Binary mixtures of tervalent cations at concentrations between 0.5 and 2.5 μg/g and uranyl in the range 1.4–4.3 μg/g were accurately resolved by univariate calibration. The presence of thorium (2.8–7.0 μ/g) required the use of multivariate calibration in order to obtain accurate results. Tervalent cations were globally determined as lanthanum. The sampling rate was about 60 samples/h. The results obtained in the analysis of U and Th in a pitchblende agree well with the certified values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323197
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  • 10
    Electronic Resource
    Electronic Resource
    Application of multicomponent spectrophotometry to analytical control of electroplating solutions (1991)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 340 (1991), S. 410-414 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A procedure for the simultaneous spectrophotometric determination of organic additives and the quantitation of Ni(II) in Zn-Ni electrolytic baths is described. Organic additives were determined by resolving the mixed spectrum over the wavelength range 278–330 nm by applying a least-squares fitting computational program to the standard spectrum of each component. Spectra were recorded on a hydroalcoholic medium (15% methanol) containing 0.1 mol/l NH4Cl. The Ni(II) concentration was determined by applying the program to the first-derivative spectrum over the wavelength range 660–820 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00322412
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