Relative changes in mRNA expression of angiopoietins and receptors tie in bovine corpus luteum during estrous cycle and prostaglandin F2alpha-induced luteolysis: a possible mechanism for the initiation of luteal regression     

Tanaka J  Acosta TJ  Berisha B  Tetsuka M  Matsui M  Kobayashi S  Schams D  Miyamoto A 《The Journal of reproduction and development》2004,50(6):619-626

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ELISA for anti-MPB70: an option for the diagnosis of goat tuberculosis caused by Mycobacterium bovis     

Acosta B  Real F  León L  Déniz S  Ferrer O  Rosario I  Ramírez A 《Australian veterinary journal》2000,78(6):423-424

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Wheat and barley cultivars show plant traits acclimation and increase grain yield under simulated shade in Mediterranean conditions     

M. Guadalupe Arenas‐Corraliza  M. Lourdes Lpez‐Díaz  Víctor Rolo  Gerardo Moreno 《Journal of Agronomy and Crop Science》2021,207(1):100-119

Agroforestry systems are reported as climate‐resilient productive systems, but it is yet unclear how tree shade affects crops performance. The aim of this work was to assess how the phenology, plant traits and grain yield of wheat and barley were affected by shade. In an open greenhouse experiment, we cultivated in pots nine cultivars differing in precocity for each species and imposed three artificial shading levels (S0 ~ 0%, S1 ~ 25%, S2 ~ 50%) at the start of cereal booting. Our results showed that shade speeded up first growth stages in both species, until the starting of milk development. Barley showed consistent phenological responses to the three irradiance levels among cultivars, but not wheat that showed larger phenological differences among cultivars at moderate shade. Deep shade prolonged the time needed for wheat grain ripening. Both species increased grain yield by 15%–20% with shade, driven by shade‐acclimations of plant traits that differed among species. For wheat, grain yield was determined by the assemblage of traits that contribute to yield, such as grain weight, precocity and non‐photochemical quenching, while, for barley, SPAD value, precocity to reach phenological stages, grains per spike and plant height had the strongest influence. These traits varied widely among cultivars and seem of interest to identify best suited cultivars for shading conditions of Mediterranean agroforestry systems.  相似文献   

Evolution of highly pathogenic H7N3 avian influenza viruses in Mexico     

Nídia Sequeira Trovo  Guadalupe Ayora Talavera  Martha I. Nelson  Juan Diego Perez de la Rosa 《Zoonoses and public health》2020,67(3):318-323

Highly pathogenic H7N3 influenza A viruses have persisted in poultry in Mexico since 2012, diversifying into multiple lineages that have spread to three Mexican states, as of 2016. The H7N3 viruses segregate into three distinct clades that are geographically structured. All 2016 viruses are resistant to adamantane antiviral drugs and have an extended 24‐nucleotide insertion at the HA cleavage site that was acquired from host 28S ribosomal RNA.  相似文献   

Environment: globalization of conservation: a view from the south     

Rodríguez JP  Taber AB  Daszak P  Sukumar R  Valladares-Padua C  Padua S  Aguirre LF  Medellín RA  Acosta M  Aguirre AA  Bonacic C  Bordino P  Bruschini J  Buchori D  González S  Mathew T  Méndez M  Mugica L  Pacheco LF  Dobson AP  Pearl M 《Science (New York, N.Y.)》2007,317(5839):755-756

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High-speed centrifugation of extender of freeze-thaw boar semen     

Camila R. C. de Brito  Antonio Sergio Varela Junior  Stela Mari M. Gheller  Izani B. Acosta  Andreia N. Anciuti  Norton Luiz S. Gatti  Edenara A. Silva  Nathalia W. Knabah  Carine D. Corcini 《Reproduction in domestic animals》2021,56(5):821-825

In semen cryopreservation, egg yolk is still widely used as a non-penetrating cryoprotectant. Much has been developed in the search for alternatives for this biological product. This work aimed to evaluate the processed egg yolk through ultracentrifugation and/or sonication in the cryopreservation of swine semen. Twenty-seven semen doses were purchased from a commercial boar stud and processed for cryopreservation using egg yolk lactose 11% (control) extender, processed using two different methods: high-speed centrifugation and sonication. Then, they were submitted to freeze-thawing protocol and were assessed for kinematic and cell structural parameters. Samples in which extenders underwent centrifugation had better results in velocity parameters, meanwhile those that only sonication was performed had poorest results in this parameter. The preservation of the membrane and mitochondria structure had better results when the diluent was only centrifuged in comparison with the other treatments. Therefore, centrifugation of extender containing egg yolk is important for better cryopreservation of swine semen.  相似文献   

Responses of five species of conifer seedlings to aluminum stress     

Thomas C. Hutchinson  Leah Bozic  Guadalupe Munoz-Vegas 《Water, air, and soil pollution》1986,31(1-2):283-294

Seedlings of red, white and black spruce, and white and jack pine were tested for their response to a range of Al concentrations, when grown for 12 to 14 weeks in sand culture in the greenhouse. Nutrients were supplied in solution of pH 3.8 to which Al was supplied at 0, 5, 10, 20, 40, 80 and 160 mg/L. Red and white spruce were inhibited in growth from 5 mg/L upwards, while black spruce was equally inhibited only at concentrations > 20 mg/L. In contrast, white pine was stimulated by 5 to 20 mg Al/L and was always more tolerant than the other 4 species at every Al level used. Jack pine was intermediate in its response. There was a positive linear relationship between P and Al accumulation in the shoots of red spruce. This was in contrast to the other 4 species in which P concentrations in the shoot decreased with an increase in Al concentrations. In localization studies on jack pine using a modified hematoxylin stain, Al was shown to accumulate in the root cap of root tips, and in the epidermal and outer cortical walls of older roots. EDAX-SEM analysis confirmed the tissue distribution of Al and revealed its coincidental distribution with. P in roots.  相似文献   

Characterization of polyphenolics in the seed coat of Black Jamapa bean (Phaseolus vulgaris L.)     

Aparicio-Fernandez X  Yousef GG  Loarca-Pina G  de Mejia E  Lila MA 《Journal of agricultural and food chemistry》2005,53(11):4615-4622

The common bean contains phytochemicals, including phenolic compounds, which can provide health benefits to the consumer. Our objective was to characterize the polyphenolic compounds present in the seed coat of Black Jamapa bean and to test fractionation methods that permit the recovery of polyphenolics in their naturally occurring forms. A 100% methanol extract from seed coats was subjected to different chromatographic fractionation methods. Analysis by HPLC-MS revealed that a better separation of phytochemicals was achieved using direct silica gel fractionation, which allowed more accurate identification of compounds, especially of the flavonols. Anthocyanins, flavanol monomers, and heterogeneous flavanol oligomers up to hexamers were detected. To our knowledge, this is the first time that myricetin glycoside and proanthocyanidin oligomers containing (epi)-gallocatechin have been reported in the black bean. The fractionation methods used in this study produced large quantities of natural mixtures of flavonoids suitable for testing bioactivity and phytochemical interactions.  相似文献   

Maximum a posteriori estimation of the daily ozone peaks in Mexico City     

Luis?J.?álvarezEmail author  Adrián?A.?Fernández-Bremauntz  Eliane?R.?Rodrigues  Guadalupe?Tzintzun 《Journal of Agricultural, Biological & Environmental Statistics》2005,10(3):276-290

Exposure to high levels of pollution is a persistent problem in large cities throughout the world. The ability to predict the occurrence of a high level of a pollutant allows environmental authorities to take preventive measures, such as controlling the emission of pollution. Communities and officials can also take actions to reduce the exposure of susceptible groups in the population. Therefore, being able to estimate the behavior of a given pollutant is of great importance. In this article we use a Markov chain model to study this behavior. In order to do so, we consider the sequence of the daily maximum measurements of a pollutant and let successive intervals containing them follow a Markov chain of order K>-0. The novelty here is that we allow K to be a random variable and estimate it and the corresponding transition probabilities using a maximum a posteriori method. The results are used to perform estimations about the behavior of ozone levels in Mexico City.  相似文献   

Formulation of low-cost fermentative media for lactic acid production with Lactobacillus rhamnosus using vinification lees as nutrients     

Bustos G  Moldes AB  Cruz JM  Domínguez JM 《Journal of agricultural and food chemistry》2004,52(4):801-808

Lees coming from different steps in white wine and red wine vinification were characterized under physicochemical analyses to determine the content in carbon, nitrogen, ashes, solids in suspension, organic compounds, and minerals. Due to the hydrolytic activity of Lactobacillus strains, lees without autolysis treatments were used directly as the unique nutrient or in combination with corn steep liquor to carry out the glucose to lactic acid fermentation with Lactobacillus rhamnosus CECT-288. Time courses of glucose and lactic acid were modeled according to reported models. Using 20 g/L of lees coming from the white wine technology and re-collected after the second decanting step before distillation, as the only nutrient, the values achieved (P = 105.5 g/L, Q(P) = 2.470 g/L.h) were even higher than those obtained with the costly MRS broth (P = 104.3 g/L, Q(P) = 2.251 g/L.h).  相似文献