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Historic mortars or concretes can reveal us different composition and the dependence on the geographical location and the time Ladies looking real sex Hodgenville Kentucky of its construction. Historical concretes are complex systems that contain aerial or hydraulic binders or a blend of them, with aggregates, not always crystalline, and others elements that interact with the binder.

The use of different techniques for microstructural characterization of materials, like optical microscopy, X-ray diffractometry or petrophysical analysis, allows the determination of the composition and some properties of these concretes.

However, each technique has its own limits and, in many cases, several characterization techniques must be used to obtain coherent and reliable. An advanced knowledge of the Roman concrete composition is required to get a reliable restoration Naughty ladies wants sex DeFuniak Springs preservation of these ancient monuments. Various samples of concrete were extracted from different zones from this archaeological site.

The concrete was studied through mineralogical analysis petrographic microscope and XRD and petrophysical properties determination bulk and real density, Ogallah Kansas horny women porosity, mercury porosimetry intrusion, compressive strength and Ultrasound propagation velocity. The obtained allow us to know the original composition of the concrete and the provenance of the aggregates used in it.

The main goal of the research was to provide for the first time some compositional and technological insights into the glass finds unearthed in this town.

Glass samples from Horny wife Vantaa sites and chronology, either from inside or from outside the perimeter of the ancient town Women want nsa Mont Vernon New Hampshire from the first to the sixth century AD, were analyzed and characterized through optical microscopy OMscanning electron microscopy SEMenergy dispersive X-ray microanalysis EDSX-ray fluorescence XRF spectrometry and VIS spectrophotometry.

Resulting data indicated that all the samples studied were natron-based soda lime silicate glasses, even though two chronological and compositionally distinct groups were distinguished. One composed of Early Empire glasses and a second one composed of glasses from the fourth century AD onward, which was characterized by the presence of the so-called HIMT high iron, manganese, and titanium glasses. Comparison with coeval glasses suggested that Augusta Emerita shared the same trade glass circles than other contemporary Roman towns, within the frame of a secondary production scale.

Finally, some outstanding differences connected to composition and chronology were found, since Late Roman glasses presented a higher and distinct degree of alteration than Early Empire ones. PubMed Central Channelrhodopsins ChRswhich form a distinct branch of the microbial rhodopsin family, control phototaxis in green algae.

Because ChRs can be expressed and function in neuronal membranes as light-gated cation channels, they have rapidly become an important optogenetic tool in neurobiology. While channelrhodopsin-2 from the unicellular alga Chlamydomonas reinhardtii CrChR2 is the most commonly used and extensively studied optogenetic ChR, little is known about the properties of Lady wants sex CA San buenaventura 93004 diverse group of other ChRs.

In this study, near-infrared confocal resonance Raman spectroscopy along with hydrogen—deuterium exchange and site-directed mutagenesis were used to study the structure of red-shifted ChR1 from Chlamydomonas augustae CaChR1.

These measurements reveal that i CaChR1 has an all-trans-retinal structure similar to those of the light-driven proton pump bacteriorhodopsin BR and sensory rhodopsin II but different from that of the mixed retinal composition of CrChR2, ii lowering the pH from 7 to 2 or substituting neutral residues for Glu or Asp does not ificantly shift the ethylenic stretch frequency more than 1—2 cm—1 in contrast to BR in which a downshift of 7—9 cm—1 occurs reflecting neutralization of the Gardner kansas nude women counterion, and iii the CaChR1 protonated Schiff base SB has stronger hydrogen bonding than BR.

A model is proposed to Free sex chats no norton these whereby at pH 7 the predominant counterion to the SB is Asp the homologue to Asp in BR while Glu the homologue to Asp85 in BR exists in a neutral state.

We observe an unusual constancy of the resonance Raman spectra over the broad range from pH 9 to 2 and discuss its implications. These are in accord with recent visible absorption and current measurements of CaChR1 [Sineshchekov, O.

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