Browsing by Title Facultad de Ciencias
Now showing items 3984-4003 of 8168
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(American Chemical Society and American Society of Pharmacognosy, 2000-03-15)(S)-(+)-Boldine (1) was brominated, chlorinated, and iodinated using molecular bromine in acetic acid or N-halosuccinimides in trifluoroacetic acid. Initial halogenation occurs at C-3, followed (in the cases of chlorine ...
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(Elsevier Science Ltd., 2002-12-19)Cytisine (cy) is a potent and competitive partial agonist at α4 subunit-containing nicotinic acetylcholine (nACh) receptors while at homomeric α7-nACh receptors it behaves as a full agonist with a relatively lower potency. ...
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(ELsevier Science, Inc., 1998-12-18)The selectivity of 3-nitrosoboldine and different halogenated derivatives of boldine (3-bromoboldine, 3,8-dibromoboldine and 3-chloroboldine) for ai - adrenoceptor subtypes was studied by examining [3H]-prazosin ...
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(1993)Pacifenol, a halogenated sesquiterpene was isolated from Laurencia claviformis. The effects of pacifenol and two derivatives on survival and feeding behaviour of the aphid Schizaphis graminum were studied. Toxicity of ...
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(IOP, 2015)Maximization of the path information entropy is a clear prescription for constructing models in non-equilibrium statistical mechanics. Here it is shown that, following this prescription under the assumption of arbitrary ...
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(1976)We give noncanonical (without string) and canonical (with string) Hamiltonian formulations for a system of classical electric and magnetic charges. We do not introduce potentials in either case. This allows us to see very ...
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(ELSEVIER, 2006-02-15)In this Letter, the mathematical expressions corresponding to the kernel, local and global spin softness have been derived, and their relationship with other indices have been explored. Introducing various spin kernels, ...
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(1995)A theoretical study of the conformational dependence upon internal rotation of molecular hardness and its correlation with the torsional potential energy is performed for two representative molecules that present rotational ...
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(Estonian Biocentre and Tartu University, Gyaneshwer Chaubey, 2014)The West Antarctic Peninsula (WAP) has been suffering an increase in its atmospheric temperature during the last 50 years, mainly associated with global warming. This increment of temperature trend associated with changes ...
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(Elsevier, 2012)The prevailing view in the palaeoclimate literature of the last 20 years is that the Southern Westerly Winds (SWW) were intensified over southern Australia and Tasmania during the warmer-than-present early Holocene (11e8 ...
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Head morphometry of Orestias (Cyprinodontiformes). Response to extreme Southern Altiplano systems? (Springer, 2020)The distribution ofOrestias(Cypriniforms) species in the southern western Altiplano (17oS-22oS) is allopatric; the seven species described inhabit different freshwater systems with extreme climatic characteristics and ...
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(Elsevier Science, 2016)Background: Although evidence from Latin America and the Caribbean suggests that depression can be effectively treated in primary care settings, depression management remains unevenly performed. This systematic review ...
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(Oxford University Press, 2001)Relative growth rates, basal and acclimated thermotolerance, membrane damage, fluorescence emission, and relative levels of free and conjugated ubiquitin and HSP70 were compared after 2 h of treatment at different temperatures ...
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(Sociedad Chilena Química, 2016)RIVER flows have constant interaction between water and bed sediments; for this reason knowledge of the characteristics of the sediments is fundamental to understand water chemistry. This study determined the concentrations ...
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(Springer, 2017)In this study, we analyze the concentration of ten metals in two freshwater fish-the benthic catfish Trichomycterus areolatus and the limnetic silverside Basilichthys microlepidotus-in order to detect possible accumulation ...
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(2013)Microbial solubilizing of metals in acid environments is successfully used in industrial bioleaching of ores or biomining to extract metals such as copper, gold, uranium and others. This is done mainly by acidophilic and ...
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(2004)Stem cells are crucial for normal development and homeostasis, and their misbehavior may be related to the origin of cancer. Progress in these areas has been difficult because the mechanisms regulating stem cell lineages ...
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(American Institute of Physics, 2020)We have compared the magnetic properties of well-controlled ultra-short (<= 50nm) atomic iron (Fe) chains embedded in Fe-phthalocyanine films with those in Fe-hydrogen (H-2) phthalocyanine superlattices. Surprisingly, we ...
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(1999)We have investigated the solution conformation of the functionally relevant C-terminal extremes of α- and β-tubulin, employing the model recombinant peptides RL52α3 and RL33β6, which correspond to the amino acid sequences ...
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(Wiley, 2017)Alzheimer's disease (AD) is characterized by extracellular senile plaques, intracellular neurofibrillary tangles, and neuronal death. Aggregated amyloid-beta (A beta) induces inflammation and oxidative stress, which have ...