Ciencia E Investigacion Agraria最新文献_第6页

Induction of direct organogenesis from aerial explants of scented alstroemeria genotypes 香花苜蓿基因型空中外植体直接器官发生的诱导

Ciencia E Investigacion Agraria Pub Date : 2018-08-30 DOI: 10.7764/RCIA.V45I2.1918

C. Guzmán, C. Rivas, L. Prat, D. Aros

引用次数: 1

Impact of environmental variables on PCDD/F and dl-PCB levels in dairy milk of the farming region of Chile 环境变量对智利农区牛奶中PCDD/F和dl-PCB水平的影响

Ciencia E Investigacion Agraria Pub Date : 2018-08-30 DOI: 10.7764/RCIA.V45I2.1887

N. Pizarro-Aránguiz, D. García-Mendoza, Ruben Muñoz-Obregon, B. S. Núñez, Rodrigo Pavez

{"title":"Impact of environmental variables on PCDD/F and dl-PCB levels in dairy milk of the farming region of Chile","authors":"N. Pizarro-Aránguiz, D. García-Mendoza, Ruben Muñoz-Obregon, B. S. Núñez, Rodrigo Pavez","doi":"10.7764/RCIA.V45I2.1887","DOIUrl":"https://doi.org/10.7764/RCIA.V45I2.1887","url":null,"abstract":"According to a One Health perspective, the importance of persistent organic pollutants (POPs) must be assessed because of their impact on the environment, food chain and human health. However, information on these toxic compounds is limited in Latin America and the Caribbean region. Chile is no exception; therefore, this work aimed to explain previously reported dioxin levels in cow-milk samples by utilizing regression with meteorological/geographical data that were collected over a three-year survey. To accomplish this aim, a stepwise general multiple regression analysis was carried out for polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), and dioxin-like polychlorinated biphenyls (dl-PCBs). The best statistical adjustments were achieved only for highly present congeners. Regarding PCDD/F congeners, the most relevant and significant (P <0.05) factors were the year (mostly a negative coefficient), the season, and the hectares affected by forest fires. In the case of dl-PCB congeners, there was a clear, positive relationship with the geographic parameter (UTM), and this result was consistent with previous findings that dl-PCB congeners show a trend with latitude. In contrast, wind speed was a significant negative coefficient for dl-PCBs. Despite existing knowledge on pollutant levels in milk, this study is relevant to better understand these findings in the Latin America and Caribbean regions.","PeriodicalId":50695,"journal":{"name":"Ciencia E Investigacion Agraria","volume":"44 1","pages":"109-119"},"PeriodicalIF":0.0,"publicationDate":"2018-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86396833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Chemical Composition and Antifungal and Antibacterial Activity of Mentha spicata L. Volatile Oil 薄荷挥发油的化学成分及抑菌活性研究

Ciencia E Investigacion Agraria Pub Date : 2018-04-18 DOI: 10.7764/RCIA.V45I1.1897

Y. Bayan, M. Küsek

引用次数: 14

The use of cation exchange resins in wines: Effects on pH, tartrate stability, and metal content 阳离子交换树脂在葡萄酒中的应用:对pH值、酒石酸盐稳定性和金属含量的影响

Ciencia E Investigacion Agraria Pub Date : 2018-04-18 DOI: 10.7764/RCIA.V45I1.1911

Felipe Ponce, Yaneris Mirabal-Gallardo, A. Versari, V. F. Laurie

引用次数: 13

Effects of climate trends and drought events on urban tree growth in Santiago de Chile 气候趋势和干旱事件对智利圣地亚哥城市树木生长的影响

Ciencia E Investigacion Agraria Pub Date : 2018-04-18 DOI: 10.7764/RCIA.V45I1.1793

A. Moser, E. Uhl, T. Rötzer, P. Biber, J. Caldentey, H. Pretzsch

{"title":"Effects of climate trends and drought events on urban tree growth in Santiago de Chile","authors":"A. Moser, E. Uhl, T. Rötzer, P. Biber, J. Caldentey, H. Pretzsch","doi":"10.7764/RCIA.V45I1.1793","DOIUrl":"https://doi.org/10.7764/RCIA.V45I1.1793","url":null,"abstract":"Urban trees and the services they provide (e.g., evapotranspirational cooling, shading, recreation, carbon storage, air pollution filtering) can have major effects on the microclimate of a city, although the growth conditions are often inadequate to ensure tree vitality and growth, negatively affecting their beneficial effects. In a worldwide dendrochronological study on ten urban tree species in four climatic zones, the growth and impacts of common urban tree species were assessed. This paper focuses on the results for Robinia pseudoacacia L. in the Mediterranean climate city of Santiago de Chile, highlighting the faster growth of the studied black locust trees since 1960 than its growth in the years before 1960. Furthermore, black locust displayed the best growth when situated closer to the city center than the city periphery and when in the northern and western parts of Santiago de Chile. The species characteristics of black locust also revealed an immediate negative growth reaction to drought events, followed by a rapid recovery, which was similarly influenced by the direction from and distance to the city center of the growing site. The results underline the overall worldwide findings on urban tree growth that indicate that a city climate with an extended growing season and increased temperatures can lead to improved growth of urban trees in the Mediterranean climatic zone. However, with increased growth, more rapid ageing and tree death might follow, leading to increased costs for new plantings and tree management.","PeriodicalId":50695,"journal":{"name":"Ciencia E Investigacion Agraria","volume":"27 1","pages":"35-50"},"PeriodicalIF":0.0,"publicationDate":"2018-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73287090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14

Finishing lambs on a chicory-plantain mixture or a temperate grassbased pasture: live weight gain and gastrointestinal parasitism 在菊苣-车前草混合物或温带草基牧场上育肥羔羊:活增重和胃肠道寄生

Ciencia E Investigacion Agraria Pub Date : 2018-04-18 DOI: 10.7764/RCIA.V45I1.1874

C. Alomar, P. Ruiz, L. Balocchi, G. Valenzuela, D. Goic

{"title":"Finishing lambs on a chicory-plantain mixture or a temperate grassbased pasture: live weight gain and gastrointestinal parasitism","authors":"C. Alomar, P. Ruiz, L. Balocchi, G. Valenzuela, D. Goic","doi":"10.7764/RCIA.V45I1.1874","DOIUrl":"https://doi.org/10.7764/RCIA.V45I1.1874","url":null,"abstract":"Improved plantain ( Plantago lanceolata L.) and chicory ( Cichorium intybus L.) are attractive forage species for finishing lambs and contain compounds that might protect sheep from gastrointestinal nematodes. This study compared the live weight gain and parasite burden of weaned lambs finished on a plantain-chicory mix (Pl-C) or a permanent grassbased pasture (PP) and treated with or without an endectocide. From mid-November, weaned lambs (n=72, average live weight 32 kg) were distributed into three paddocks per sward type for 30 d. Half of the lambs were initially treated with ivermectin. Fecal egg counts (FEC), larvae genera and the presence of infective larvae (L3) in pastures were evaluated. No differences (P>0.05) were obtained between the pastures for the initial (ca. 80 epg) or final FEC (322 epg) or type of eggs (Strongylidor Nematodirus-type). Ivermectin treatment reduced (P 0.05) of pasture type or anthelmintic treatment and no interactions were detected on the cultured larvae genera, except for Cooperia, which decreased with the anthelmintic treatment. By day 30, the number of L3 recovered from the pastures increased (P 0.05) in the Pl-C (average 63 L3 kg-1 DM). The parasite load estimated by the FEC reached low infection levels ( 0.05) among treatments (average 173 g d-1), reflecting an adequate nutritional quality of both pastures and a moderate parasitism status of the lambs.","PeriodicalId":50695,"journal":{"name":"Ciencia E Investigacion Agraria","volume":"59 2 1","pages":"11-20"},"PeriodicalIF":0.0,"publicationDate":"2018-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88215311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Effect of climate conditions on total phenolic content and antioxidant activity of Jatropha dioica Cerv. var. dioica 气候条件对麻风树总酚含量及抗氧化活性的影响。var. dioica

Ciencia E Investigacion Agraria Pub Date : 2018-04-18 DOI: 10.7764/RCIA.V45I1.1832

Jorge Gutiérrez-Tlahque, C. Aguirre-Mancilla, J. C. Raya-Pérez, J. Ramírez-Pimentel, R. Jiménez-Alvarado, A. Hernández-Fuentes

{"title":"Effect of climate conditions on total phenolic content and antioxidant activity of Jatropha dioica Cerv. var. dioica","authors":"Jorge Gutiérrez-Tlahque, C. Aguirre-Mancilla, J. C. Raya-Pérez, J. Ramírez-Pimentel, R. Jiménez-Alvarado, A. Hernández-Fuentes","doi":"10.7764/RCIA.V45I1.1832","DOIUrl":"https://doi.org/10.7764/RCIA.V45I1.1832","url":null,"abstract":"The aim of this work was to determine the antioxidant activity, total phenolic content (TPC) and total flavonoid content (TFC) in the rhizomes and stems of Jatropha dioica and their relation to collection season, collection location, extraction solvent and their interactions to understand the effect of climate conditions on the synthesis of the antioxidant compounds in J. dioica . Plants were collected during different seasons at two locations in Mexico. A 3-factorial experimental design was used for the stems and rhizomes, using the extraction solvent, collection location and season as sources of variation. A Tukey’s test with a P≤0.05 significance level was used to perform the comparison of the means. Significant differences were found when comparing the three sources of variation separately for TPC and antioxidant activity in the stems and rhizomes. In terms of the interactions for the stems, there was a significant difference between the Morelos × 70% ethanol × dry interaction and Tetepango × water × rain interaction for the TPC and the antioxidant activity; however, no significant difference was found for the TFC. In terms of the rhizomes, a significant difference was found among the 4 variables analyzed. These results indicate that collection location, collection season and extraction solvent affect the TPC and antioxidant activity. In addition, the rhizomes presented higher antioxidant activity and TPC than that of the stems.","PeriodicalId":50695,"journal":{"name":"Ciencia E Investigacion Agraria","volume":"4 1","pages":"70-81"},"PeriodicalIF":0.0,"publicationDate":"2018-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74756405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Susceptibility of different grapevine (Vitis vinifera L.) cultivars to Diplodia seriata and Diplodia mutila 不同葡萄品种对系列双plodia和残双plodia的敏感性

Ciencia E Investigacion Agraria Pub Date : 2018-04-18 DOI: 10.7764/rcia.v45i1.1818

M. Ramírez, L. M. Pérez, J. Montealegre

引用次数: 11

Effect of daily herbage allowance restriction on pasture characteristics and milk production by grazing dairy cows in spring 日供草量限制对春季放牧奶牛牧草特性及产奶量的影响

Ciencia E Investigacion Agraria Pub Date : 2018-04-18 DOI: 10.7764/RCIA.V45I1.1841

V. Merino, L. Balocchi, F. Pulido

引用次数: 3

Investigating consumer food choice behavior: an application combining sensory evaluation and experimental auctions 消费者食品选择行为调查:感官评价与实验拍卖相结合的应用

Ciencia E Investigacion Agraria Pub Date : 2018-04-18 DOI: 10.7764/RCIA.V45I1.1765

R. Gallardo, Yeon A Hong, Marcial Ibo Silva Jaimes, Johanna Flores Orozco

{"title":"Investigating consumer food choice behavior: an application combining sensory evaluation and experimental auctions","authors":"R. Gallardo, Yeon A Hong, Marcial Ibo Silva Jaimes, Johanna Flores Orozco","doi":"10.7764/RCIA.V45I1.1765","DOIUrl":"https://doi.org/10.7764/RCIA.V45I1.1765","url":null,"abstract":"We investigate what piece of information collected utilizing sensory evaluation tools exhibits better predictive capacity on the willingness to pay, is it information from preferences for a sensory quality attribute using hedonic scales or information on perceived intensity for the same attribute using intensity scales? We also estimated if extrinsic or intrinsic quality exerts a similar impact on consumer’s willingness to pay. We conducted a sensory evaluation along with experimental auctions using three different apple varieties with college students in Metropolitan Lima, Peru. Findings from this study show that information collected on preference liking for apple quality attributes has a better explanatory capability for willingness to pay, compared to information on consumers’ perceived intensity for the same attribute. The explanatory capability was measured using measures of goodness-of-fit. We also prove that willingness to pay was driven both by the apple variety induced intrinsic quality attributes and the extrinsic cues of the variety. Results add to the existing body of literature aiming to improve the understanding of consumer food choice behavior.","PeriodicalId":50695,"journal":{"name":"Ciencia E Investigacion Agraria","volume":"116 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2018-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79744713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11