Free amino acid composition of quince (Cydonia oblonga Miller) fruit (pulp and peel) and jam   总被引：2，自引：0，他引：2  

Silva BM  Casal S  Andrade PB  Seabra RM  Oliveira MB  Ferreira MA 《Journal of agricultural and food chemistry》2004,52(5):1201-1206

Twenty-one free amino acids present in several samples of quince fruit (pulp and peel) and quince jam (homemade and industrially manufactured) were analyzed by GC/FID. The analyses showed some differences between quince pulps and peels. Generally, the highest content in total free amino acids and in glycine was found in peels. As a general rule, the three major free amino acids detected in pulps were aspartic acid, asparagine, and hydroxyproline. For quince peels, usually, the three most abundant amino acids were glycine, aspartic acid, and asparagine. Similarly, for quince jams the most important free amino acids were aspartic acid, asparagine, and glycine or hydroxyproline. This study suggests that the free amino acid analysis can be useful for the evaluation of quince jam authenticity. It seems that glycine percentage can be used for the detection of quince peel addition while high alanine content can be related to pear addition.  相似文献   

UFO Consensus     

Rosa RJ 《Science (New York, N.Y.)》1967,158(3806):1265

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Nature and domestic life in the Valle del Cuñapirú (Misiones, Argentina): Reflections on Mbyá-Guaraní ethnoecology     

Marta Crivos  María Rosa Martínez  María Lelia Pochettino  Carolina Remorini  Cynthia Saenz  Anahí Sy 《Agriculture and Human Values》2004,21(2-3):111-125

Through the ethnographic record of the subsistence activities partially or completely performed in the domestic sphere in two Mbyá-Guaraní settlements in Misiones (Argentina), we outline factors important in describing the local natural environment. Data was collected through systematic observation and also through semi-structured interviews. Analysis indicates that the natural environment of the area is characterized by the indigenous community in several different ways. Thus, local people view the environment as made up of different “micro-environments,” and they consequently think of the elements that compose these “micro-environments” as having different, distinct characteristics. In the context of their daily activities, both these “micro-environments” and the elements that compose them are regarded as resources, in that they are viewed in terms of what is in them relevant to the subsistence of these groups in the rainforest. It is the intention of this study to initiate the systematic recording and processing of information on how these indigenous communities know and manage the natural resources available to them in their daily life.  相似文献   

Giant Friedel Oscillations on the Beryllium(0001) Surface     

PT Sprunger  L Petersen  EW Plummer  E Laegsgaard  F Besenbacher 《Science (New York, N.Y.)》1997,275(5307):1764-1767

Large-amplitude electron density oscillations were observed on a Be(0001) surface by means of variable-temperature scanning tunneling microscopy. Fourier transforms of the images showed a ring of radius 2kF, where kF is the Fermi wave vector of the Be(0001) surface state. This wavelength was expected from Friedel oscillations caused by electronic screening of surface defects, but the amplitude of the waves for energies near the Fermi energy was anomalously large and inconsistent with the Friedel concept of screening. The enhanced amplitude of the waves must be a many-body effect, either in the electron gas (possibly an incipient charge density wave) or in the response of the lattice (electron-phonon coupling).  相似文献   

An isomorphous heavy-atom derivative of crystaline formylmethionine transfer RNA   总被引：1，自引：0，他引：1  

R W Schevitz  M A Navia  D A Bantz  G Cornick  J J Rosa  M D Rosa  P B Sigler 《Science (New York, N.Y.)》1972,177(47):429-431

An isomorphous osmium derivative of crystalline yeast initiator transfer RNA has been prepared and interpreted to 6-angstrom resolution. The coordinates of the heavy atoms have been determined by Patterson and "direct" methods applied to the difference coefficients of the centric projections, followed by least-squares refinement. There is one dominant site per asymmetric unit, consistent with the finding by neutron-activation analysis that there is approximately one osmium atom per molecule of transfer RNA. The osmium derivative appears to be a normal substrate for enzymatic aminoacylation.  相似文献   

Dorid nudibranch elaborates its own chemical defense     

Cimino G  DE Rosa S  DE Stefano S  Sodano G  Villani G 《Science (New York, N.Y.)》1983,219(4589):1237-1238

A biosynthetic experiment with mevalonic acid labeled with carbon-14 showed that the nudibranch Dendrodoris limbata elaborates polygodial, a sesquiterpenoid dialdehyde stored in the mantle, which constitutes its chemical defense against predators. Previously described nudibranchs drew defensive chemicals from their preys.  相似文献   

Developmentally regulated activation of a SINE B2 repeat as a domain boundary in organogenesis   总被引：1，自引：0，他引：1  

Lunyak VV  Prefontaine GG  Núñez E  Cramer T  Ju BG  Ohgi KA  Hutt K  Roy R  García-Díaz A  Zhu X  Yung Y  Montoliu L  Glass CK  Rosenfeld MG 《Science (New York, N.Y.)》2007,317(5835):248-251

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Responsible Scientific Choice     

Rosa N 《Science (New York, N.Y.)》1963,142(3594):914

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Differences between tight and loose cultures: a 33-nation study     

Gelfand MJ  Raver JL  Nishii L  Leslie LM  Lun J  Lim BC  Duan L  Almaliach A  Ang S  Arnadottir J  Aycan Z  Boehnke K  Boski P  Cabecinhas R  Chan D  Chhokar J  D'Amato A  Ferrer M  Fischlmayr IC  Fischer R  Fülöp M  Georgas J  Kashima ES  Kashima Y  Kim K  Lempereur A  Marquez P  Othman R  Overlaet B  Panagiotopoulou P  Peltzer K  Perez-Florizno LR  Ponomarenko L  Realo A  Schei V  Schmitt M  Smith PB  Soomro N  Szabo E  Taveesin N  Toyama M  Van de Vliert E  Vohra N  Ward C  Yamaguchi S 《Science (New York, N.Y.)》2011,332(6033):1100-1104

With data from 33 nations, we illustrate the differences between cultures that are tight (have many strong norms and a low tolerance of deviant behavior) versus loose (have weak social norms and a high tolerance of deviant behavior). Tightness-looseness is part of a complex, loosely integrated multilevel system that comprises distal ecological and historical threats (e.g., high population density, resource scarcity, a history of territorial conflict, and disease and environmental threats), broad versus narrow socialization in societal institutions (e.g., autocracy, media regulations), the strength of everyday recurring situations, and micro-level psychological affordances (e.g., prevention self-guides, high regulatory strength, need for structure). This research advances knowledge that can foster cross-cultural understanding in a world of increasing global interdependence and has implications for modeling cultural change.  相似文献   

Variability of wild olives (Olea europaea subsp. europaea var. sylvestris) analyzed by agro-morphological traits and SSR markers     

Angjelina Belaj  Lorenzo León  Zlatko Satovic  Raúl de la Rosa 《Scientia Horticulturae》2011

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