98,061 research outputs found
Millimeter wave spectra of methyl cyanate, methoxyamine and n-methylhydroxylamine: laboratory studies and astronomical search in space
Get PDFRecent discovery of methyl isocyanate (CHNCO) in Sgr B2(N) and Orion KL\footnote{D.~T.~Halfen, V.~V.~Ilyushin, L.~Ziurys, \textit{Astrophys. J. Lett.}, \textbf{2015}, \textit{812}, L5.}\footnote{J.~Cernicharo, Z.~Kisiel, B.~Tercero, L.~Kolesnikov\'{a}, I.~R.~Medvedev et. al., \textit{Astron. Astrophys.}, \textbf{2016}, \textit{587}, L4.} makes methyl cyanate (CHOCN) a potential molecule in the interstellar medium.
Methoxyamine (CHONH) and its isomeric form N-methylhydroxylamine (CHNHOH) may be considered as a potential interstellar amines.\footnote{R. T. Garrod, S. L. Widicus Weaver, E. Herbst, \textit{Astrophys. J.}, \textbf{2008}, \textit{682}, 283.} Pure rotational transitions belonging to the ground state and several excited vibrational states were measured and analyzed up to 400 GHz. Rotational transitions revealed - splitting due to the methyl internal rotation and were globally analyzed in order to provide a precise set of the spectroscopic constants. Results of this work were used to search for the spectral features of methyl cyanate in Orion KL, Sgr B2(N), B1-b and TMC-1 molecular clouds.\footnote{L.~Kolesnikov\'{a}, J.~L.~Alonso, C. Berm\'{u}dez, E.~R.~Alonso, J.~Cernicharo et. al., \textit{Astron. Astrophys.}, \textbf{2016}, accepted.}Made available in DSpace on 2017-01-26T21:38:43Z (GMT). No. of bitstreams: 3
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Previous issue date: 2016-06-2
Segorbe (Castellón) (Obispado). Vistas de ciudades. 1773
No full textEn el ángulo superior derecho inserta vista de la ciudad de Segorbe. 8 x 19,5 cmAl verso anotado en tinta de bugalla: "XXVI"Escala gráfica también expresada en 5 leguas de 8.000 varas castellanasSumario: Presenta un mapa del obispado de SegorbeCopia Digital. Real Academia de la Historia : 2010Se conservan otros dos ejemplares: uno en el mismo Atlas (Sign. C-Atlas E, II, 27) y otro suelto (R. 511. Sign. C-VII e 6). Seguramente dos de ellos son los que se presentaron en junta académica de 30 de abril de 1773; uno lo regaló a la Academia el obispo fray Alonso Cano, académico correspondiente, y el otro el director CampomanesBrújula con la aguja señalando la declinación magnética mediterránea de casi 3º. Indica grados en la mitad septentrional. Iniciales de los cuatro puntos cardinales; la T para el N. Márgenes graduados de 5º en 5º. Relieve de trazos sombreadosLímites de los obispados colindantesRestaurado en 1999En el ángulo inferior izquierdo cartela del título en el frente de una mesa en perspectiva caballera, elevada sobre un pedestal, en cuyo frente se hallan las escalas gráficas. Encima de la mesa escudo de armas de fray Alonso Cano, con timbre de eclesiástico (mitra, cruz, báculo) y otros instrumentos religiosos: campanilla, libro, sombrero, et
The epidemiology of malaria in adults in a rural area of southern Mozambique.
Get PDFBACKGROUND: Epidemiological studies of malaria in adults who live in malaria endemic areas are scarce. More attention to the natural history of malaria affecting adults is needed to understand the dynamics of malaria infection and its interaction with the immune system. The present study was undertaken to investigate the clinical, parasitological and haematological status of adults exposed to malaria, and to characterize parasites in these individuals who progressively acquire protective immunity. METHODS: A cross-sectional survey of 249 adults was conducted in a malaria endemic area of Mozambique. Clinical, parasitological and haematological status of the study population was recorded. Sub-microscopic infections and multiplicity of infections were investigated using polymerase chain reaction (PCR) and restriction fragment length polymorphism of Plasmodium falciparum merozoite surface protein 2 (msp2). RESULTS: Prevalence of P. falciparum infection by microscopy (14%) and PCR (42%) decreased progressively during adulthood, in parallel with an increase in the prevalence of sub-microscopic infections. Anaemia was only related to parasitaemia as detected by PCR. Multiplicity of infection decreased with age and was higher in subjects with high P. falciparum densities, highlighting density-dependent constraints upon the PCR technique. CONCLUSION: Adults of Manhiça progressively develop non-sterile, protective immunity against P. falciparum malaria. The method of parasite detection has a significant effect on the observed natural history of malaria infections. A more sensitive definition of malaria in adults should be formulated, considering symptoms such as diarrhoea, shivering and headache, combined with the presence of parasitaemia
PONCE DE LEÓN, A. y ALONSO, R. A. (Coords.); ALBA, A. R.; BATANÁS, A.; DUQUE, M. C.; MARTÍNEZ, M. V.; MERINO, I.; PAJARES, Á.; RUIZ, Y., TOBÍAS, M. V. y VELANDIA, N. (2010): La motricidad en Educación Infantil. Propuestas prácticas para el aula. Madrid: CCS, 249 páginas, ISBN 978-84-9842-452-2.
No full textPONCE DE LEÓN, A. y ALONSO, R. A. (Coords.); ALBA, A. R.; BATANÁS, A.;
DUQUE, M. C.; MARTÍNEZ, M. V.; MERINO, I.; PAJARES, Á.; RUIZ, Y., TOBÍAS, M.
V. y VELANDIA, N. (2010): La motricidad en Educación Infantil. Propuestas prácticas
para el aula. Madrid: CCS, 249 páginas, ISBN 978-84-9842-452-2
Weak C-H×××O and C-H×××F-C hydrogen bonds in the Oxirane-Trifluoromethane Dimer
No full textThe oxirane-trifluoromethane dimer generated in a supersonic expansion has been characterized by Fourier transform microwave spectroscopy. The rotational spectra of the parent species and of its two 13C isotopomers in combination with ab initio calculations have been used to establish a Cs geometry for the dimer with the two monomers bound by one C-HâââO and two C-HâââF-C hydrogen bonds. An overall bonding energy of about 6.7 kJ/mol has been derived from the centrifugal distortion analysis. The lengths of the C-HâââO and C-HâââF hydrogen bonds, r(OâââH) and r (FâââH), are 2.37 and 2.68 Å, respectively. The C-HâââF-C interactions give rise to the HCF3 internal rotation motion barrier of 0.55(1) kJ/mol, which causes the A-E splittings observed in the rotational spectra. The analysis of the structural and energetic features of the C-HâââO and C-HâââF-C interactions allows us to classify them as weak hydrogen bonds. Ab initio calculations predict these weak interactions to produce blue shifts in the C-H vibrational frequencies and shortenings of the C-H lengths
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
Get PDFBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
Segorbe (Castellón) (Obispado). Mapas generales. 1773
Get PDFEn el ángulo superior derecho inserta vista de la ciudad de Segorbe. 8 x 19,5 cmAl verso anotado en tinta de bugalla: "XXVI"Escala gráfica también expresada en 5 leguas de 8.000 varas castellanasSumario: Presenta un mapa del obispado de SegorbeCopia Digital. Real Academia de la Historia : 2010Forma de ingreso: Se conservan otros dos ejemplares: uno en el mismo Atlas (Sign. C-Atlas E, II, 27) y otro suelto (R. 511. Sign. C-VII e 6). Seguramente dos de ellos son los que se presentaron en junta académica de 30 de abril de 1773; uno lo regaló a la Academia el obispo fray Alonso Cano, académico correspondiente, y el otro el director CampomanesBrújula con la aguja señalando la declinación magnética mediterránea de casi 3º. Indica grados en la mitad septentrional. Iniciales de los cuatro puntos cardinales; la T para el N. Márgenes graduados de 5º en 5º. Relieve de trazos sombreadosLímites de los obispados colindantesRestaurado en 1999En el ángulo inferior izquierdo cartela del título en el frente de una mesa en perspectiva caballera, elevada sobre un pedestal, en cuyo frente se hallan las escalas gráficas. Encima de la mesa escudo de armas de fray Alonso Cano, con timbre de eclesiástico (mitra, cruz, báculo) y otros instrumentos religiosos: campanilla, libro, sombrero, et
The Shape Of Progesterone
Get PDFSolid samples of progesterone (m.p.~C), one of the essential hormones, have been vaporized by laser ablation and probed in a supersonic expansion using a broadband Fourier transform microwave spectroscopy. The analysis of around 150 rotational transitions revealed the existence of a single conformation. Like for the related testosterone\footnote{I. Le\'{o}n, E. R. Alonso, S. Mata, and J. L. Alonso, \textit{J. Phys. Chem. Lett.} 2021, 12, 6983-6987.}, progesterone adopts an extended configuration which is the most stable form predicted by quantum-chemical calculations. Due to the methyl group internal rotation, \textit{A}--\textit{E} splittings have been observed and allowed for the precise determination of the barrier height. The considerable molecular size of progesterone, one of the largest ever attempted solid, illustrates the potential of the LA-CP-FTMW\footnote{E. R. Alonso, I. Le\'{o}n, J. L. Alonso, Intra- and Intermolecular Interactions between non-covalently Bonded Species. Elsevier, 2021, 93-141.} technique in structural chemistry.
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\textbf{Acknowledgments:} The authors thank the financial fundings from Ministerio de Ciencia e Innovacion ( PID2019-111396GB-I00) and Junta de Castilla y Le\'{o}n (VA077U16 and VA244P20)
Alona azorica Frenzel & Alonso 1988
No full textAlona azorica Frenzel & Alonso, 1988. (Figs 6, 8– 10) Alona azorica Frenzel & Alonso, 1988: 449 –465, figs 1–8; Alonso, 1996: 331 –332, fig. 147. Holotype. Female at the Zoological Museum of Hamburg University, K- 32354. Studied populations were collected in: Laguna Grande de Gredos (Gredos Range, Ávila, August 1983); Marzagón pond (Marzagón, Huelva, May 1979); Rocío pond (El Rocío, Huelva, May 1979); Laguna de Antela (R. Margalef leg., Orense, July, 1954); Laguna Corrubedu (Corrubedu, A Coruña, May, 1980); Las Naciones pond (Saucedilla, Cáceres, April, 1986). Short description: Parthenogenetic female. Body. In lateral view similar to that of previous species, regular oval (Fig. 8 A–B, 9 A), of moderate height, moderately compressed laterally. Maximum height at middle of body, in adults height/length ratio about 0.65–0.72. Dorsal margin uniformly curved; postero-dorsal and postero-ventral angles broadly rounded; posterior margin uniformly curved; ventral margin almost straight; antero-ventral angle rounded. Ventral margin with about 35–45 setae, the first ten setae long, next ten setae short, other setae of moderate length. Postero-dorsal angle (Fig. 9 B) as in previous species. Valves oblique or with small tubercules in dorsal portion, fully tuberculated specimens not recorded. Head same as in the previous species. Head shield (Fig. 8 C) similar to that of previous species, but its posterior margin forms a protruding angle with pointed tip, in large specimens posterior portion of head shield elongates and became more narrow. Three major head (Fig. 8 D, 9 C–D) pores with a narrow connection between two anterior pores; in smaller specimens broken connection sometimes present between middle and posterior pore (Fig 9 C). Distance between medium and posterior pore greatly increases with the size of specimen, varying from 1.5 to 2.5 distances between anterior and middle pore. Minute lateral head pores located at level before anterior major head pore. Labrum (Fig. 10 A) same as in previous species. Postabdomen (Fig. 8 E, 9 E–F) same as in previous species. Antennula and antenna same as in the previous species. Thoracic limbs. Limbs I–III (Fig. 10 B–F) same as in the previous species. Limb IV (Fig. 10 G–H) similar to in previous species but with the following differences: setae 5–6 of exopodite longer, seta 5 as long as seta 4, flame-torch setae of endite IV shorter, more robust and less differentiated in size. Limb V (Fig. 10 I) as in previous species. Male. For full description see Frenzel & Alonso, 1988, and Alonso, 1996. Body similar to that of the previous species. Postabdomen (Fig. 8 F) similar to that of previous species, but with much less prominent postanal angle, weakly narrowing in postanal portion and postanal angle not developed. Antennule and limb I same as in previous species. Size. According to Frenzel & Alonso (1988), minimum length of juvenile female 0.19 mm, maximum length of adult female 0.48 mm, length of adult male 0.28–0.34 mm.Published as part of Sinev, Artem Y., Alonso, Miguel, Miracle, Maria Rosa & Sahuquillo, Maria, 2012, The West Mediterranean Alona azorica Frenzel & Alonso, 1988 (Cladocera: Anomopoda: Chydoridae) is composed of two species, pp. 51-68 in Zootaxa 3276 on pages 60-61, DOI: 10.5281/zenodo.20963
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