Sermones funebre[s] / magistri Iohannis de sancto Geminia[no] ; [cum] [dupli]ci tabula eoru[n]dem.

Texto a dos col.

Extraterrestrial amino acids in Orgueil and Ivuna: Tracing the parent body of CI type carbonaceous chondrites

Amino acid analyses using HPLC of pristine interior pieces of the CI carbonaceous chondrites Orgueil and Ivuna have found that β-alanine, glycine, and γ-amino-n-butyric acid (ABA) are the most abundant amino acids in these two meteorites, with concentrations ranging from ≈600 to 2,000 parts per billion (ppb). Other α-amino acids such as alanine, α-ABA, α-aminoisobutyric acid (AIB), and isovaline are present only in trace amounts (<200 ppb). Carbon isotopic measurements of β-alanine and glycine and the presence of racemic (D/L ≈ 1) alanine and β-ABA in Orgueil suggest that these amino acids are extraterrestrial in origin. In comparison to the CM carbonaceous chondrites Murchison and Murray, the amino acid composition of the CIs is strikingly distinct, suggesting that these meteorites came from a different type of parent body, possibly an extinct comet, than did the CM carbonaceous chondrites.

Mapping Intercellular CO2 Mole Fraction (Ci) in Rosa rubiginosa Leaves Fed with Abscisic Acid by Using Chlorophyll Fluorescence Imaging1 : Significance of Ci Estimated from Leaf Gas Exchange

Imaging of photochemical yield of photosystem II (PSII) computed from leaf chlorophyll fluorescence images and gas-exchange measurements were performed on Rosa rubiginosa leaflets during abscisic acid (ABA) addition. In air ABA induced a decrease of both the net CO2 assimilation (An) and the stomatal water vapor conductance (gs). After ABA treatment, imaging in transient nonphotorespiratory conditions (0.1% O2) revealed a heterogeneous decrease of PSII photochemical yield. This decline was fully reversed by a transient high CO2 concentration (7400 μmol mol−1) in the leaf atmosphere. It was concluded that ABA primarily affected An by decreasing the CO2 supply at ribulose-1,5-bisphosphate carboxylase/oxygenase. Therefore, the An versus intercellular mole fraction (Ci) relationship was assumed not to be affected by ABA, and images of Ci and gs were constructed from images of PSII photochemical yield under nonphotorespiratory conditions. The distribution of gs remained unimodal following ABA treatment. A comparison of calculations of Ci from images and gas exchange in ABA-treated leaves showed that the overestimation of Ci estimated from gas exchange was only partly due to heterogeneity. This overestimation was also attributed to the cuticular transpiration, which largely affects the calculation of the leaf conductance to CO2, when leaf conductance to water is low.

Expression cloning of dSR-CI, a class C macrophage-specific scavenger receptor from Drosophila melanogaster.

Mammalian class A macrophage-specific scavenger receptors (SR-A) exhibit unusually broad binding specificity for a wide variety of polyanionic ligands. The properties of these receptors suggest that they may be involved in atherosclerosis and host defense. We have previously observed a similar receptor activity in Drosophila melanogaster embryonic macrophages and in the Drosophila macrophage-like Schneider L2 cell line. Expression cloning was used to isolate from L2 cells a cDNA that encodes a third class (class C) of scavenger receptor, Drosophila SR-CI (dSR-CI). dSR-CI expression was restricted to macrophages/hemocytes during embryonic development. When expressed in mammalian cells, dSR-CI exhibited high affinity and saturable binding of 125I-labeled acetylated low density lipoprotein and mediated its chloroquine-dependent, presumably lysosomal, degradation. Although the broad polyanionic ligand-binding specificity of dSR-CI was similar to that of SR-A, their predicted protein sequences are not similar. dSR-CI is a 609-residue type I integral membrane protein containing several well-known sequence motifs, including two complement control protein (CCP) domains and somatomedin B, MAM, and mucin-like domains. Macrophage scavenger receptors apparently mediate important, well-conserved functions and may be pattern-recognition receptors that arose early in the evolution of host-defense mechanisms. Genetic and physiologic analysis of dSR-CI function in Drosophila should provide further insights into the roles played by scavenger receptors in host defense and development.

Noi, esplorat-t-ori. Quanti sentieri ci servono per leggerci?

Cosa ci spinge a viaggiare? Siamo così terribilmente annoiati dalle nostre insicurezze e dalle luccicanti certezze della società che per rimanere in vita sentiamo il bisogno di muoverci, spostarci, andare fuori. Ma fuori dove? Crediamo davvero di salvarci andando a cercare qualcosa che non riusciamo nemmeno a definire? Coloro che potrebbero rispondere affermativamente a un tale quesito non sono quelli che partono, ma quelli che non tornano. Viaggiare per me significa leggere le differenze e leggermi nel profondo, scrivere dell’esperienza e scrivermi tracciando il mio cambiamento, tradurre da una lingua all’altra e tradurre le mie nuove emozioni. Questo elaborato è, perci��, l’umile tentativo di descrivere la complessità e l’arricchimento che può derivare dal fare esperienza, che sia viaggiando, leggendo, scrivendo o traducendo, vedendomi “di spalle che partivo” come avrebbe detto Fabrizio De André. Il fil rouge che creerà un legame tra tali azioni, che tesserà la trama dell’arazzo della mia esperienza è la metafora. La metafora è qualcosa che va anche al di là della sua semplice etimologia dal greco che la rende protagonista di un portare oltre. Metterò in scena il dubbio e la curiosità come motivi del viaggiare; parlerò della soglia come sipario che scorre via una volta che ci si apre all’Altro e non vi è più distinzione né distanza di spazio e tempo; varcherò i confini delle definizioni come palcoscenico in cui lettori, scrittori e traduttori viaggiano, e mostrerò come questi siano antropologi, registi e spettatori allo stesso tempo. Tutto ci�� che infine rimarrà non sarà solo il silenzio, l’assenza derivanti dalle perdite che tali esperienze comportano, ma soprattutto l’amore che l’accoglienza dell’Altro insegna.

Weishenme Zhongguo zai diyi ci shijie dazhan zhong juyou zhongyao zuoyong 为什么中国在第一次世界大战中具有重要作用 (Why China Played an Important Role in the First World War)

Aufbauend auf dem analytischen Tool des Totalen Krieges (vgl. den Artikel des Autors zu Controversy Total War in 1914-1918-Online) werden im vorliegenden Beitrag die Anstrengungen Chinas im Ersten Weltkrieg zu denjenigen anderer nicht europäischer Länder wie Australien, Südafrika oder Indien in Bezug gesetzt. Dabei wird das Ziel verfolgt, den globalen Charakter eines Konfliktes deutlich zu machen, der zurecht als erster Weltkrieg bezeichnet wird und in welchem China sicherlich eine weit bedeutsamere Rolle spielte, als es gemeinhin in der Historiographie dargestellt wird. Ursprünglich wurde der Beitrag als Antwort auf die Frage konzipiert, warum nicht nur China für eine Globalgeschichte des Ersten Weltkrieges von Bedeutung war. Im Verlauf der Übersetzung wurde der Titel dahingehend angepasst, dass stärker die Bedeutung von Chinas Rolle im Ersten Weltkrieg betont wurde.

Las fiestas patrias; tratado de la preparación y ejecución de los actos ci��vicos en las escuelas de la República.

Mode of access: Internet.

Los ci��vicos; novela política de lucha y de dolor.

"Algunas opiniones eminentes sobre 'Renacimiento alto-peruano'": p. [245]-254.