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排序方式: 共有121条查询结果,搜索用时 734 毫秒
71.
Maud C. Quinzin Jonathan Sandoval-Castillo Joshua M. Miller Luciano B. Beheregaray Michael A. Russello Elizabeth A. Hunter James P. Gibbs Washington Tapia Freddy Villalva Adalgisa Caccone 《Conservation biology》2019,33(6):1404-1414
Hybridization poses a major challenge for species conservation because it threatens both genetic integrity and adaptive potential. Yet, hybridization can occasionally offer unprecedented opportunity for species recovery if the genome of an extinct taxon is present among living hybrids such that selective breeding could recapture it. We explored the design elements for establishing a captive-breeding program for Galapagos tortoises (Chelonoidis spp.) built around individuals with admixed ancestry involving an extinct species. The target individuals were hybrids between the extinct species from Floreana Island, C. niger, and an extant species, C. becki, which were recently found in the endemic range of C. becki, from Wolf Volcano on Isabela Island. We combined genotypic data from 35 tortoises with high ancestry from C. niger with forward-in-time simulations to explore captive breeding strategies that maximized overall genetic diversity and ancestry from C. niger while accommodating resource constraints, species biology, and the urgency to return tortoises to Floreana Island for facilitating ecosystem restoration. Overall genetic diversity was maximized when in the simulation tortoises were organized in relatively small breeding groups. Substantial amounts of the C. niger genome were captured despite limited resources available for selectively breeding tortoises in captivity. Genetic diversity was maximized when captive-bred offspring were released to the wild rather than being used as additional breeders. Our results provide genetic-based and practical guidance on the inclusion of hybrids with genomic representation from extinct taxa into species restoration programs and informs the ongoing debate on the value of hybrids in biodiversity conservation. 相似文献
72.
Luca Catarinucci Luciano Tarricone 《International journal of occupational safety and ergonomics》2013,19(1):45-52
The finite difference time domain method (FDTD) is frequently used for the numerical solution of a wide variety of electromagnetic (EM) problems and, among them, those concerning human exposure to EM fields. In many practical cases related to the assessment of occupational EM exposure, large simulation domains are modeled and high space resolution adopted, so that strong memory and central processing unit power requirements have to be satisfied. To better afford the computational effort, the use of parallel computing is a winning approach; alternatively, subgridding techniques are often implemented. However, the simultaneous use of subgridding schemes and parallel algorithms is very new. In this paper, an easy-to-implement and highly-efficient parallel graded-mesh (GM) FDTD scheme is proposed and applied to human–antenna interaction problems, demonstrating its appropriateness in dealing with complex occupational tasks and showing its capability to guarantee the advantages of a traditional subgridding technique without affecting the parallel FDTD performance. 相似文献
73.
Hipolito Victor Leibnitz Amorim Vanessa Amorim Gleize Philippe Jean Paul Girotto Edivandro Jnior Amrico Cruz Benavides Roberto Sanchez Saul da Silva Luciano Magnago Rachel Faverzani 《Journal of Material Cycles and Waste Management》2022,24(2):452-465
Journal of Material Cycles and Waste Management - In this article, we present the results of the composite development obtained from polyurethane (PU), polyvinyl chloride (PVC), and aluminum... 相似文献
74.
Valentina Ciardelli Nicola Rizzo Antonio Farina Marisa Vitarelli Paola Boni Luciano Bovicelli 《黑龙江环境通报》2001,21(7):586-588
The relationship between fetal renal function (FRF) and fetal serum beta2-microglobulin (B2MG) was investigated by comparing its value in 112 unaffected fetuses with that of 23 fetuses presenting with urinary tract malformations (UTM). Fetal serum level of B2MG was totally unrelated to gestational age; its value increased in cases of severe impairment of FRF but was similar to controls in all mild uropathies (p<0.05). Evaluating serum B2MG could be beneficial in fetuses with severe renal damage, but is of no use in unilateral UTM since only the global FRF is tested and not the function of each single kidney. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
75.
Luiz Henrique Nobre Bof Fernando Falco Pruski Luciano Meneses Cardoso da Silva Flavio Justino 《Environmental management》2013,51(2):492-500
Agreement on the criteria for granting the right to use water resources between governing bodies represents a significant advance in the process of sharing water use. To aid water resource management agencies in optimizing water use, the impact of using different criteria for permitting water use in the Paracatu river basin, Brazil, was evaluated in this study. The streamflow criteria corresponding to 30 % of the annual Q7,10 (used by the governing body of Minas Gerais), 70 % of the annual Q95 (used by the governing body of the union), 30 % of the monthly Q7,10, and 70 % of the monthly Q95 were evaluated. The use of criteria based on the monthly streamflow allows for better management of water use because it allows for greater utilization of this resource in times when there is high water availability and imposes a more realistic restriction during critical periods. Substitution of the annual Q7,10 for the monthly Q7,10 significantly increases the streamflow permitted in some months, for example, from December to May. Use of the criterion of 70 % of the annual Q95 involves a high risk of drought in critical months, while the criterion of 70 % of the monthly Q95 minimizes this risk. 相似文献
76.
77.
Mark T. Cullen MD Sandro Gabrielli Jacqueline J. Green Nicola Rizzo Maurice J. Mahoney Carolyn Salafia Luciano Bovicelli John C. Hobbins 《黑龙江环境通报》1990,10(10):643-651
Thirty cases of cervical cystic hygroma were diagnosed in the first trimester of pregnancy. Karyotype analysis was available in 29 (97 per cent). Fifteen (52 per cent) had a chromosomal abnormality. The ultrasound appearance was described as posterior cervical, lateral cervical, or cervical hygroma with hydrops. Of the 14 euploid embryos, six were electively aborted, two are undelivered, and six have been delivered as phenotypically normal infants. In cases in which the chromosomes were normal and the pregnancy continued, all lesions resolved by 18 weeks. 相似文献
78.
Heavy metals monitoring at a Mediterranean natural ecosystem of Central Italy. Trends in different environmental matrixes 总被引:3,自引:0,他引:3
Morselli L Brusori B Passarini F Bernardi E Francaviglia R Gataleta L Marchionni M Aromolo R Benedetti A Olivieri P 《Environment international》2004,30(2):173-181
The study deals with the evaluation of the impact of heavy metal pollution on a Mediterranean natural ecosystem, and presents the results derived from a monitoring of heavy metals in different environmental matrixes (atmospheric dry depositions, suspended particulate matter (SPM) and stemflow of forest trees). Two sites in Castelporziano Presidential Estate (Rome), one internal and one near the sea-side, were chosen in order to assess the differences in pollutant load. Results showed that heavy metal contamination can arise from local anthropogenic activities, in particular road traffic, and long-range pollution, from industrial and artisan activities near Rome. 相似文献
79.
Buzica D Gerboles M Amantini L Ballesta PP De Saeger E 《Journal of environmental monitoring : JEM》2005,7(2):169-174
The influence of environmental parameters on the uptake rate of the nitrogen dioxide (NO(2)) Palmes diffusive sampler was investigated. The main factors affecting the uptake rate were found to be wind speed, the preponderant factor, followed by relative humidity and temperature. The NO(2) concentration and exposure time, as well as the interactions among the factors were not found to have a significant influence on the uptake rate of the Palmes sampler. As a result, a model able to predict the uptake rate of the Palmes sampler was established. In addition, by using the model-predicted uptake rate, the agreement between chemiluminescence and the Palmes sampler during the field tests was improved. The NO(2) Palmes diffusive sampler was shown to comply with the requirement on accuracy defined by the European Directive for the indicative methods of measurements. 相似文献
80.
Georgia Carvalho Paulo Moutinho Daniel Nepstad Luciano Mattos Márcio Santilli 《Mitigation and Adaptation Strategies for Global Change》2000,5(4):411-411