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  • 1
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    Pleurotus strains with remediation potential to remove toxic metals from Doce River contaminated by Samarco dam mine (2021)
    Springer
    Details
    Publication Date: 2021-08-14
    Print ISSN: 1735-1472
    Electronic ISSN: 1735-2630
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Springer
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Nesting biology and nest re-use ofEulaema nigrita (Hymenoptera: Apidae, Euglossini) (1994)
    Springer
    Insectes sociaux 41 (1994), S. 99-110 
    Details
    ISSN: 1420-9098
    Keywords: Nesting biology ; nest re-use ; Eulaema nigrita ; Euglossini ; Apidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The nesting behavior of the euglossine beeEulaema nigrita was observed in the laboratory after being transferred from three nests to observation boxes. Nests were re-used by successive generations with more than one female working in each re-use process. Associated females were always of the same generation. All females that shared a nest foraged for construction materials (mud, excrement and resin) and each constructed, provisioned and oviposited in her own cells. The number of cells constructed by each female ranged from one to 23. Females stayed in the nests for periods ranging from 15 to 59 days during the hot and wet season and from five to 78 days during the cool and dry season. The egg-to-adult period was related to climatic conditions, and in all re-use processes it was longer than the time of residence of the females in the nests. The meloid beetleMeloetyphlus attacephalus was the only nest parasite. Due to the attack method employed by this parasite, the presence of more than one female in the nest did not result in improved nest defense.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01240577
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of gentamycin on insulin release and45Ca net uptake by isolated islets (1982)
    Springer
    Cellular and molecular life sciences 38 (1982), S. 1320-1321 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In isolated islets, gentamycin reduced both the45Ca net uptake and insulin release induced by glucose, but failed to inhibit the insulin secretion provoked by the combination of Ba2+ and theophylline. This indicates that the inhibitory effect of gentamycin is due to a reduction of Ca2+ entry into B-cells instead of to a harmful effect upon the integrity of the effector system, responsible for the extrusion of the insulin containing granules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01954926
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  • 4
    Electronic Resource
    Electronic Resource
    Heavy metal contamination and physiological variability in the Brazilian mangrove crabs Ucides cordatus and Callinectes danae (Crustacea: Decapoda) (2000)
    Springer
    Marine biology 137 (2000), S. 691-703 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Physiological studies were made on the crabs Ucides cordatus (L.) and Callinectes danae sampled from populations living in “polluted” mangroves on the southeast littoral of Brazil. Analysis of Cu, Cd, Zn, and Fe of sediments and crab tissues showed interspecific differences in tissue concentrations, and significantly higher levels of Cu, Cd, and Zn in “polluted” populations compared to “unpolluted” crabs living in uncontaminated mangrove in the same geographical area. Individuals of both species from the polluted site showed significantly greater capacities for regulating blood osmotic concentrations at low salinity (9‰). However, U. cordatus showed a reduced hypo-regulatory ability in 34‰S. Differences in ionoregulation were also seen. “Polluted”C. danae showed significantly higher Na/ K-ATPase levels in posterior gills compared to “unpolluted” crabs. Oxygen consumption rates (M˙ O2) were elevated in U. cordatus, but depressed in C. danae from the “polluted” population. Individuals of both species from this site showed significantly lower O:N ratios, mainly because of an increased net efflux of ammonia. Adenylate energy charge (AEC) values of muscle and hepatopancreas in “unpolluted” and “polluted” populations of both species were not significantly different. These physiological differences are discussed in relation to the known acute physiological and metabolic effects of heavy metals in crustaceans, and interpretated in the light of possible adaptive changes following long-term exposure to contamination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270000382
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis of the allelic diversity of a (CA)n repeat polymorphism among α1-antitrypsin gene products from northern Portugal (1997)
    Springer
    Human genetics 〈Berlin〉 99 (1997), S. 194-198 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The level of molecular heterogeneity associated with α1-antitrypsin gene products was assessed in the population of northern Portugal using three restriction fragment length polymorphisms (RFLPs) corresponding to specific amino acid substitutions and a highly variable (CA)n repeat polymorphism located at the 5′ end of the PI gene. The allelic affinities inferred from the analysis of the DNA polymorphisms essentially agree with the evolutionary pattern proposed for the PI gene products on the basis of their amino acid sequences. PI*Z can be considered the most recent common PI allele and was found to be associated with the same predominant haplotype previously reported in northern European populations, thus confirming the hypothesis that most European Z alleles are derived from a single mutation. However, a rare deficient variant that is the likely result of a recurrent Z mutation on an M2 or M4 background was additionally observed. PI*S was also found to be associated with a strongly predominant haplotype and seems to be the second most recent PI common allele, while M2 and M3 show weaker associations, suggesting more ancient origins of their corresponding mutations. M1Ala213 and M1Val213 display more homogeneous (CA)n allele frequency distributions, M1Ala213 representing the most ancient PI allele as inferred from its highest variance in (CA)n allele length.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004390050337
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  • 6
    Electronic Resource
    Electronic Resource
    Nitrogen fixation capacity and nodule occupancy by Bradyrhizobium japonicum and B. elkanii strains (1998)
    Springer
    Biology and fertility of soils 27 (1998), S. 393-399 
    Details
    ISSN: 1432-0789
    Keywords: Key words Bradyrhizobium japonicum ; Bradyrhizobium elkanii ; Competitiveness ; Nitrogen fixation ; Soybean
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  In a previous study soybean Bradyrhizobium strains, used in Brazilian studies and inoculants over the last 30 years, and strains adapted to the Brazilian Cerrados, a region frequently submitted to environmental and nutritional stresses, were analyzed for 32 morphological and physiological parameters in vivo and in vitro. A cluster analysis allowed the subdivision of these strains into species Bradyrhizobium japonicum, Bradyrhizobium elkanii and a mixed genotype. In this study, the bacteria were analyzed for nodulation, N2 fixation capacity, nodule occupancy and the ability to increase yield. The goal was to find a relationship between the strain groups and the symbiotic performance. Two strains of Brazilian B. japonicum showed higher rates of N2 fixation and nodule efficiency (mg of N mg–1 of nodules) under axenic conditions. These strains also showed greater yield increases in field experiments when compared to B. elkanii strains. However, no differences were detected between B. japonicum and B. elkanii strains when comparing nodule occupancy capacity. The adapted strains belonging to the serogroup B. elkanii SEMIA 566, most clustered in a mixed genotype, were more competitive than the parental strain, and some showed a higher capacity of N2 fixation. Some of the adapted strains, such as S-370 and S-372, have shown similar N2 fixation rates and nodulation competitiveness to two Brazilian strains of B. japonicum. This similarity demonstrates the possibility of enhancing N2 fixing ability, after local adaptation, even within B. elkanii species. Differences in the DNA profiles were also detected between the parental SEMIA 566 and the adapted strains by analyses with the ERIC and REP-PCR techniques. Consequently, genetic, morphological and physiological changes can be a result of adaptation of rhizobia to the soil. This variability can be used to select strains capable of increasing the contribution of N2 fixation to soybean nutrition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050449
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  • 7
    Electronic Resource
    Electronic Resource
    Quantum statistics of multiphoton unimolecular dissociation (1984)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 3 (1984), S. 389-407 
    Details
    ISSN: 0392-6737
    Keywords: Molecular photon processes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si suggerisce un modello statistico per il processo di dissociazione unimolecolare multifotonico che considera i livelli di energia del modo attivo vibrazionale, un bagno di calore quasi continuo costituito dai livelli di energia dei restanti modi della molecola e di un frammento eccitato elettronicamente che risulta dalla dissociazione. L’equazione master del sistema e le espressioni degl’impulsi sono derivate e discusse nel formalismo standard della seconda quantizzazione. Per l’equazione master, gli elementi di matrice della densità diagonali e al di fuori della diagonale sono calcolati e si discute sulle loro applicazioni per stabilire il cambiamento della statistica della luce.
    Abstract: Резюме Мя предлагаем статистическую модель для процесса многофотонной мономолекулярной диссоциации. Эта модель учитывает энергетические уровни колебательной активной моды, энергетические квазинепрерывные уровни термостата, которые состоят из знергетических уровней оставшихся мод молекулы, и электронных возбуюдений фрагментов, образованных при диссоциации. Выводится задаюЩее уравнение для системы и выражения для моментов. Проводится обсуждение в рамках стандартного формализма вторичного квантования. С помощью задающего уравнения вычисляются диагональные и недиагональные элементы матрицы плотности. Проводится обсуюдение статистики света.
    Notes: Summary We suggest a statistical model for the process of multiphoton unimolecular dissociation which considers the energy levels of the vibrational active mode, a quasi-continuous heat bath constituted by the energy levels of the remaining modes of the molecule and an electronically excited fragment resulting from the dissociation. The master equation for the system and expressions for the moments are derived and discussed in the standard second-quantization formalism. From the master equation the diagonal and off-diagonal density matrix elements are evaluated and some discussion on their applications to establish the change of light statistics is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457467
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  • 8
    Electronic Resource
    Electronic Resource
    The effect of radiative transport on fluorescence emission (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 53-59 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A model for radiative transport of electronic excitation energy in solution is presented and applied to the time-resolved and steady-state fluorescence of DPA (9, 10-diphenylanthracene) in benzene. The model predicts a nonexponential and wavelength-dependent decay at high concentrations, in agreement with experimental results. Recovered parameters, along with the time-resolved emission spectrum, are interpreted on the basis of a progression of the excitation with time farther into the cell, after the excitation pulse.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456504
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  • 9
    Electronic Resource
    Electronic Resource
    Monte Carlo simulation of orientational effects on direct energy transfer (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 6341-6349 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The donor ensemble excitation decay is obtained by a Monte Carlo simulation for the three-dimensional case. Donor and acceptor reorientational motions are explicitly considered within the isotropic diffusion model. Allowance is made for donor and acceptor different rotational rates. The orientation dependent part of the decay is fully contained in the factor 〈(∼(κ2))1/2〉 which is the ensemble average of the square root of the finite time average of the usual orientational factor κ2. The time dependence of 〈(∼(κ2))1/2〉 is evaluated by a Monte Carlo simulation procedure for several relative mobilities of the donor–acceptor pair and finally captured in a simple, one-parameter formula.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454472
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  • 10
    Electronic Resource
    Electronic Resource
    Diffusion-influenced excimer formation kinetics (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 1817-1824 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A model for reversible monomer–excimer kinetics is developed, taking into account that different distributions of monomers around the excited ones are created by light absorption and excimer dissociation. The excimer formation rate coefficient departs from the Collins–Kimball equation owing to reversibility, originating significant deviations to Birks' kinetics in the monomer and excimer decays. The contribution of the geminate pair created by excimer dissociation on the overall kinetics is significant for low monomer concentrations and high viscosities. Simultaneous analysis of the monomer and excimer decay curves according to the model developed should allow to extract all the relevant information concerning the excimer formation diffusion controlled process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461029
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