Sediment source apportionment following wildfire in an upland commercial forest catchment     

Muñoz-Arcos  Enrique  Castillo  Alejandra  Cuevas-Aedo  Alicia  Ovando-Fuentealba  Luis  Taylor  Alex  Bustamante-Ortega  Ramón  Blake  William H.  Bravo-Linares  Claudio 《Journal of Soils and Sediments》2021,21(6):2432-2449

Journal of Soils and Sediments - Wildfires can have major impacts on water scarcity and water quality linked to off-site transfer of polluting ash and nutrients. Understanding sediment sources in...  相似文献   

Evaluation of Simple Sequence Repeat (SSR) Markers Established in Europe as a Method for the Identification of Potato Varieties Grown in Canada   总被引：1，自引：0，他引：1  

Marie-José Côté  Lisa Leduc  Alex Reid 《American Journal of Potato Research》2013,90(4):340-350

The correct identification of potato varieties is crucial to maintaining the quality level of seeds produced under the Canadian Seed Potato Certification Program. During inspection of in vitro potato plant propagation centres or seed potato production field lots, morphological characteristics may not be sufficient for the identification of plantlets or tubers and therefore molecular identification is sought by inspectors for variety confirmation. With international harmonization of testing methods in mind, we proposed to evaluate further the microsatellite (SSR) markers established successfully by Reid et al. (2009, Euphytica 182: 239–249, 2011), using the reference potato variety DNA collection at the Canadian Food Inspection Agency (CFIA) established and currently used for Amplified Fragment Length Polymorphism (AFLP) genotyping. The SSR markers developed by the European community laboratories were successfully validated by and established within the CFIA laboratory. Most genotypes generated for a set of 34 varieties were identical between the 2 laboratories with only 3 discrepancies due to the different interpretation of the presence/absence of the alleles. When used with potato reference DNAs of the CFIA collection, the method successfully differentiated 217 varieties apart but 10 groups, which are most likely clonal variants, were not discriminated. The SSR markers were successfully used to address 5 potato variety verification requests from CFIA inspectors during field inspections for seed potato certification. The markers successfully confirmed the presence of rogue varieties in 4 of these requests, therefore fulfilling the CFIA’s mandate towards stakeholders of the Canadian potato industry in preserving the quality of certified seeds.  相似文献   

Warum verschwinden Tannensaaten und Tannenanflug so oft wieder     

Bargmann 《Forstwissenschaftliches Centralblatt》1911,33(6):309-317

Ohne Zusammenfassung  相似文献   

Treatment of wounds on Acer rubrum with Trichoderma viride1     

H. William Pottle  Alex L. Shigo 《Forest Pathology》1975,5(5):274-279

Wounds on 90 Acer rubrum trees were inoculated with Trichoderma viride in July and August 1973 to determine the effect of the fungus on the development of decay. The trees were 45 years old and 15 cm diam at 1.4 m aboveground. Each tree had 12 wounds, 1.4 cm in diam and 5 cm deep. After a year 28 trees were harvested and isolations were made from the discolored, and decayed wood associated with each wound. Trichoderma viride was reisolated from all wounds that were inoculated with it. Hymenomycetes were isolated frequently from decayed wood associated with wounds not inoculated with T. viride. No Hymenomycetes were isolated from wounds inoculated with T. viride.  相似文献   

Evaluation of promoters and visual markers for transformation of eastern white pine     

Zipf  Allan  Diner  Alex M.  Ward  Rufina  Bharara  Suman  Brown  George  Nagmani  R.  Pareek  L.K.  Sharma  Govind C. 《New Forests》2001,21(1):45-58

This report serves to evaluate possible promoters for use in theproduction of transgenic eastern white pine (Pinus strobus L.).Embryogenic cultures of eastern white pine were bombarded with goldparticles coated separately with a variety of gene constructs containingthe UidA -glucuronidase (GUS) or green fluorescentprotein (GFP) reporter gene. Transient expression of the UidAgene, driven by a novel algal virus adenine methyl transferase genepromoter, as well as five other promoters used in angiospermtransformation, were evaluated. The maize alcohol dehydrogenase promoterwas not effective in eastern white pine cultures. The construct with thedoubled Cauliflower Mosaic Virus 35S promoter plus Alfalfa Mosaic Virusenhancer showed the highest levels of expression. GUS expression wasdetected within 24 hours, but decreased after 5 days and was notdetectable 15 days after bombardment. Expression of GUS activity wasrecorded mainly in somatic embryonal heads of various stages ofdevelopment and occasionally in suspensor cells. Similar to GUSexpression, modified green fluorescent protein (GFP) was detected in theembryonal head cells 24 hours after bombardment. GFP-expressingsuspensor cells were both more infrequent and difficult to detect, astheir highly vacuolate nature rendered the GFP presence less visibleagainst the yellow background autofluorescence.  相似文献   

Hypotensive and vasorelaxant effects of ethanolic extract from Jatropha gossypiifolia L. in rats     

Abreu IC  Marinho AS  Paes AM  Freire SM  Olea RS  Borges MO  Borges AC 《Fitoterapia》2003,74(7-8):650-657

The present work was carried out to examine the hypotensive effects of ethanolic extract (EE) from Jatropha gossypiifolia L. The oral administration of EE (125 or 250 mg kg(-1) day(-1)) caused a significant and dose-dependent reduction of the systolic blood pressure. The concentration-response curves to norepinephrine (NE) or Ca(2+) were non-parallelly shifted to the right and the maximum contractile responses were concentration dependently depressed by EE (0.1 or 0.5 mg/ml) in endothelium-deprived mesenteric artery. The cumulative additions of EE (0.1-30 mg/ml) caused a concentration-dependent relaxant response in endothelium-deprived mesenteric artery precontracted with NE or Ca(2+). In conclusion, our results have shown that the EE from J. gossypiifolia L. can elicit hypotension, by oral via, in conscious normotensive rats and vasorelaxant activity on rat mesenteric rings precontracted with NE or Ca(2+).  相似文献   

Porcupine quills in raccoons as an indicator of rabies, distemper, or both diseases: disease management implications          下载免费PDF全文

Rosatte R  Wandeler A  Muldoon F  Campbell D 《The Canadian veterinary journal. La revue veterinaire canadienne》2007,48(3):299-300

A relationship was detected between the presence of embedded porcupine quills and the diagnosis of rabies in raccoons in eastern Canada during 1999-2004. No relationship was found between the presence of quills in raccoons and the diagnosis of canine distemper. Raccoons with embedded quills should be submitted for rabies testing.  相似文献   

Aldo-keto reductase may contribute to glyphosate resistance in Lolium rigidum     

Feng-Yan Zhou  Heping Han  Yun-Jing Han  Alex Nyporko  Qin Yu  Hugh J. Beckie  Stephen B. Powles 《Pest management science》2023,79(4):1528-1537

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Changes in fetal mannose and other carbohydrates induced by a maternal insulin infusion in pregnant sheep     

Laura D Brown  Stephanie R Thorn  Alex Cheung  Jinny R Lavezzi  Frederick C Battaglia  Paul J Rozance 《畜牧与生物技术杂志(英文版)》2015,(2):222-229

Background: The importance of non-glucose carbohydrates, especially mannose and inositol, for normal development is increasingly recognized. Whether pregnancies complicated by abnormal glucose transfer to the fetus also affect the regulation of non-glucose carbohydrates is unknown. In pregnant sheep, maternal insulin infusions were used to reduce glucose supply to the fetus for both short(2-wk) and long(8-wk) durations to test the hypothesis that a maternal insulin infusion would suppress fetal mannose and inositol concentrations. We also used direct fetal insulin infusions(1-wk hyperinsulinemic-isoglycemic clamp) to determine the relative importance of fetal glucose and insulin for regulating non-glucose carbohydrates.Results: A maternal insulin infusion resulted in lower maternal(50%, P < 0.01) and fetal(35-45%, P < 0.01) mannose concentrations, which were highly correlated(r2= 0.69, P < 0.01). A fetal insulin infusion resulted in a 50% reduction of fetal mannose(P < 0.05). Neither maternal nor fetal plasma inositol changed with exogenous insulin infusions.Additionally, maternal insulin infusion resulted in lower fetal sorbitol and fructose(P < 0.01).Conclusions: Chronically decreased glucose supply to the fetus as well as fetal hyperinsulinemia both reduce fetal non-glucose carbohydrates. Given the role of these carbohydrates in protein glycosylation and lipid production, more research on their metabolism in pregnancies complicated by abnormal glucose metabolism is clearly warranted.  相似文献   

Barley viability during storage: use of magnetic resonance as a potential tool to study viability loss     

Gruwel ML  Yin XS  Edney MJ  Schroeder SW  MacGregor AW  Abrams S 《Journal of agricultural and food chemistry》2002,50(4):667-676

Malting-quality barley samples of the varieties Harrington, Manley, and TR118, each from two locations in Saskatchewan, were collected directly from the producers and sent to China for storage. At regular intervals samples were shipped back to Canada for analysis consisting of germination studies, alpha-amylase tests, magnetic resonance imaging (MRI), and magnetic relaxation (NMR) studies. Samples showing a decrease in germinative energy and elevated levels of alpha-amylase also showed a rapid uptake of water in the area between the embryo and the endosperm as observed by MRI. Using NMR relaxation experiments, viable and nonviable barley samples could be distinguished after 2 h of imbibition.  相似文献