Activity of Ricinus communis (Euphorbiaceae) and ricinine against the leaf-cutting ant Atta sexdens rubropilosa (Hymenoptera: Formicidae) and the symbiotic fungus Leucoagaricus gongylophorus     

Bigi MF  Torkomian VL  de Groote ST  Hebling MJ  Bueno OC  Pagnocca FC  Fernandes JB  Vieira PC  da Silva MF 《Pest management science》2004,60(9):933-938

The focus of this study was the identification of compounds from plant extracts for use in crop protection. This paper reports on the toxic activity of fractions of leaf extracts of Ricinus communis L (Euphorbiaceae) and isolated active compounds in the leaf-cutting ant Atta sexdens rubropilosa Forel and its symbiotic fungus Leucoagaricus gongylophorus (Singer) M?ller. The main compounds responsible for activity against the fungus and ant in leaf extracts of R communis were found to be fatty acids for the former and ricinine for the ants.  相似文献   

Effect of κ/ß-Carrageenan from red alga Tichocarpus crinitus (Tichocarpaceae) on infection of detached tobacco leaves with tobacco mosaic virus     

Reunov  A.  Nagorskaya  Vera  Lapshina  Larissa  Yermak  Irina  Barabanova  Anna 《植物病害和植物保护杂志》2004,111(2):165-172

Journal of Plant Diseases and Protection - It is shown that κ/ß-carrageenan obtained from red marine alga Tichocarpus crinitus possesses antiviral activity against Tobacco mosaic virus...  相似文献   

Synthesis of deuterated volatile lipid degradation products to be used as internal standards in isotope dilution assays. 1. Aldehydes.     

J Lin  D H Welti  F A Vera  L B Fay  I Blank 《Journal of agricultural and food chemistry》1999,47(7):2813-2821

The isotopically labeled compounds [5,6-(2)H(2)]hexanal (d-I), [2, 3-(2)H(2)]-(E)-2-nonenal (d-II), [3,4-(2)H(2)]-(E,E)-2,4-nonadienal (d-III), and [3,4-(2)H(2)]-(E,E)-2,4-decadienal (d-IV) were prepared in good yields using new or improved synthesis procedures. Labeling position, chemical purity, and isotopic distribution of the compounds were characterized by various MS and NMR techniques. These molecules are used as internal standards in quantification experiments based on isotope dilution assay. Synthesis of d-I, d-III, and d-IV has not yet been reported in the literature.  相似文献   

Cover Image     

Caio Augusto Perazza  Jos Bento Sterman Ferraz  Vera Maria Fonseca Almeida‐Val  Alexandre Wagner Silva Hilsdorf 《Aquaculture Research》2019,50(10):i-i

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Woodland and floral richness boost bumble bee density in cranberry resource pulse landscapes     

Pfeiffer  Vera  Silbernagel  Janet  Guédot  Christelle  Zalapa  Juan 《Landscape Ecology》2019,34(5):979-996

Landscape Ecology - Native pollinators provide an important ecosystem service for many pollination-dependent fruit crops, but require nesting and foraging resources in proximity to target crop...  相似文献   

Interactions of Protein and Starch Studied Through Amyloglucosidase Action     

Nicoletta Guerrieri  Lucia Eynard  Vera Lavelli  Paolo Cerletti 《Cereal Chemistry》1997,74(6):846-850

The access of amyloglucosidase to the carbohydrate molecule was taken as a measure of interactions occurring among starch, amylose, amylopectin, β-dextrin and purified gluten, gliadins, high molecular weight glutenin subunits, or bovine serum albumin when they were mixed together and gelatinized before digestion. The most relevant decrease in liberated glucose, denoting coverage of some reaction sites for amyloglucosidase, occurred when gliadins were mixed with the carbohydrates. Other proteins were not as effective as gliadins. Amylopectin was not affected by any protein. Comparison of results allows some hypothesis to be formulated about the influence of structure on molecular interactions.  相似文献   

Carabids (Coleoptera: Carabidae) in a forest patchwork: a connectivity analysis of the Bereg Plain landscape graph     

Ferenc Jordán  Tibor Magura  Béla Tóthmérész  Vera Vasas  Viktor Ködöböcz 《Landscape Ecology》2007,22(10):1527-1539

For many species, one important key to persistence is maintaining connectivity among local populations that allow for dispersal and gene flow. This is probably true for carabid species (Coleoptera:Carabidae) living in the fragmented forests of the Bereg Plain (NE Hungary and W Ukraine). Based on field data, we have drafted a landscape graph of the area representing the habitat network of these species. Graph nodes and links represented two kinds of landscape elements: habitat (forest) patches and corridors, respectively. The quality of habitat patches and corridors were ranked (from low (1) to high (4)), reflecting local population sizes in the case of patches and estimated permeability in the case of corridors. We analysed (1) the positional importance of landscape elements in maintaining the connectivity of the intact network, (2) the effect of inserting hypothetical corridors into the network, (3) the effects of improving the quality of the existing corridors, and (4) how to connect every patch in a cost-effective way. Our results set quantitative priorities for conservation practice by identifying important corridors: what to protect, what to build and what to improve. Several network analytical techniques were used to account for the directed (source-sink) and highly fragmented nature of the landscape graph. We provide conservation priority ranks for the landscape elements and discuss the conditions for the use of particular network indices. Our study could be of extreme relevance, since a new highway is being planned through the area.  相似文献   

Haemolytic Assay of Sheep Serum Complement1     

Otakar Barta  Vera Barta  Ruth A. Shirley  Janet D. McMurry 《Zoonoses and public health》1975,22(3):254-262

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Genetic association between milk yield,stayability, and mastitis in Holstein cows under tropical conditions     

Natalia Irano  Annaiza Braga Bignardi  Lenira El Faro  Mário Luiz Santana Jr  Vera Lúcia Cardoso  Lucia Galvão Albuquerque 《Tropical animal health and production》2014,46(3):529-535

The objective of this study was to estimate genetic parameters for milk yield, stayability, and the occurrence of clinical mastitis in Holstein cows, as well as studying the genetic relationship between them, in order to provide subsidies for the genetic evaluation of these traits. Records from 5,090 Holstein cows with calving varying from 1991 to 2010, were used in the analysis. Two standard multivariate analyses were carried out, one containing the trait of accumulated 305-day milk yields in the first lactation (MY1), stayability (STAY) until the third lactation, and clinical mastitis (CM), as well as the other traits, considering accumulated 305-day milk yields (Y305), STAY, and CM, including the first three lactations as repeated measures for Y305 and CM. The covariance components were obtained by a Bayesian approach. The heritability estimates obtained by multivariate analysis with MY1 were 0.19, 0.28, and 0.13 for MY1, STAY, and CM, respectively, whereas using the multivariate analysis with the Y305, the estimates were 0.19, 0.31, and 0.14, respectively. The genetic correlations between MY1 and STAY, MY1 and CM, and STAY and CM, respectively, were 0.38, 0.12, and ?0.49. The genetic correlations between Y305 and STAY, Y305 and CM, and STAY and CM, respectively, were 0.66, ?0.25, and ?0.52.  相似文献   

Singing icebergs     

Müller C  Schlindwein V  Eckstaller A  Miller H 《Science (New York, N.Y.)》2005,310(5752):1299

Sustained harmonic tremor signals were recorded by the seismographs of the German Neumayer Base seismological network in western Dronning Maud Land, Antarctica. These tremor episodes, lasting up to 16 hours, were recorded up to 820 kilometers from the source. Their spectra show narrow peaks with fundamental frequencies ranging from 0.5 to 6 hertz, more than 30 integer harmonic overtones, and frequency gliding, resembling volcanic tremor. Frequency-wave number analysis suggested a moving source, which was recognized as iceberg B-09A traveling along the coast of eastern Antarctica. The most probable tremor sources are fluid-flow-induced vibrations inside the iceberg's tunnel/crevasse systems.  相似文献