排序方式： 共有9条查询结果，搜索用时 250 毫秒
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Biserra Thiago Trento Cecato Ulysses Galbeiro Sandra Bridi Ana Maria Fernandes Henrique Jorge Duarte Camila Fernandes Domingues Da Silva Diogo Rodrigues Vicente João Vitor Rosa Rogel Camila Piechnicki 《Tropical animal health and production》2020,52(2):625-635
Carcass characteristic and meat quality from bulls and Nellore steers (n?=?64 total) subjected to different grazing heights (15, 25, 35, and 45 cm) were evaluated isolatedly, under continuous grazing and variable load, in pastures of Convert grass. The experimental period was from May 2015 to June 2017, in an area of 16 ha, divided into 16 paddocks of 1 ha. The experimental design was randomized blocks with four replications. Each paddock was grazed by three animals and regulators, used to adjust grazing heights. The final slaughter weight, hot carcass, and crude protein in the meat of steers were higher when the pastures were managed at 42 cm. When the pasture was managed between 25 and 35 cm in height, greater fat thickness, marbling, muscle:bone and muscle+fat:bone ratio and lower color* of the meat and percentage of bone were found. For the steers, the height of 40 cm provided higher fat thickness and marbling in the meat. The loss during thawing in meat was greater at 28 cm in height. The heights of grazing alter the carcass characteristics and meat of bulls and steers.
相似文献2.
Takata Yoshinobu Sato Shigeru Ha Dao Viet Montojo Ulysses M. Lirdwitayaprasit Thaithaworn Kamolsiripichaiporn Somporn Kotaki Yuichi Fukuyo Yasuwo Kodama Masaaki 《Fisheries Science》2009,75(2):473-480
Domoic acid was found in bivalves belonging to the genus Spondylus collected randomly from the Philippines, Vietnam, Thailand and Ishigaki Island, Japan. This is the first report of domoic
acid accumulating in bivalves from tropical waters. Large differences in domoic acid levels were observed among the Spondylus specimens collected from different areas. The Spondylus specimens from the Philippines and Vietnam showed higher levels of domoic acid whereas the level in Spondylus spp. from Thailand and Japan was low. The highest level of domoic acid—more than four times the safe consumption level of
20 μg/g whole tissue—was found in a specimen from the Philippines. On the other hand, bivalves other than Spondylus collected from the same area at the same time in the Philippines showed very low levels of domoic acid, showing that bivalves
belonging to the genus Spondylus accumulate specifically high levels of domoic acid. These results suggest the wide distribution of causative phytoplankton
in tropical waters. 相似文献
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Lynch-Stieglitz J Adkins JF Curry WB Dokken T Hall IR Herguera JC Hirschi JJ Ivanova EV Kissel C Marchal O Marchitto TM McCave IN McManus JF Mulitza S Ninnemann U Peeters F Yu EF Zahn R 《Science (New York, N.Y.)》2007,316(5821):66-69
The circulation of the deep Atlantic Ocean during the height of the last ice age appears to have been quite different from today. We review observations implying that Atlantic meridional overturning circulation during the Last Glacial Maximum was neither extremely sluggish nor an enhanced version of present-day circulation. The distribution of the decay products of uranium in sediments is consistent with a residence time for deep waters in the Atlantic only slightly greater than today. However, evidence from multiple water-mass tracers supports a different distribution of deep-water properties, including density, which is dynamically linked to circulation. 相似文献
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Lefèvre CT Menguy N Abreu F Lins U Pósfai M Prozorov T Pignol D Frankel RB Bazylinski DA 《Science (New York, N.Y.)》2011,334(6063):1720-1723
Magnetotactic bacteria contain magnetosomes--intracellular, membrane-bounded, magnetic nanocrystals of magnetite (Fe(3)O(4)) or greigite (Fe(3)S(4))--that cause the bacteria to swim along geomagnetic field lines. We isolated a greigite-producing magnetotactic bacterium from a brackish spring in Death Valley National Park, California, USA, strain BW-1, that is able to biomineralize greigite and magnetite depending on culture conditions. A phylogenetic comparison of BW-1 and similar uncultured greigite- and/or magnetite-producing magnetotactic bacteria from freshwater to hypersaline habitats shows that these organisms represent a previously unknown group of sulfate-reducing bacteria in the Deltaproteobacteria. Genomic analysis of BW-1 reveals the presence of two different magnetosome gene clusters, suggesting that one may be responsible for greigite biomineralization and the other for magnetite. 相似文献
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<正>作为植物油和蛋白的来源,大豆是世界上最重要的油料种籽,在美国、巴西、阿根廷和中国大量种植。大豆可加工成食用的豆粉或饲用大豆饼(粕)。中国、日本和东南亚国家常用大豆制作食品;美国和欧洲则主要用于榨油和制成豆粕。世界上已发现的大豆品种有数百种,但用于商业种植生产仅有几十种。 相似文献
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The carbon isotopic composition ((13)C/(12)C, expressed as δ(13)C) of fossil foraminifera is the primary tracer used to infer changes in past ocean ventilation, and its variations are interpreted by using the modern oceanic δ(13)C distribution as a framework. However, the present ocean δ(13)C distribution is strongly overprinted by isotopically light anthropogenic carbon dioxide. A correction for this oceanic C-13 Suess effect in the North Atlantic (NA) shows that the pristine NA δ(13)C distribution has a richer and more detailed structure that is more clearly related to water mass distributions. Our results revise some fundamental perceptions regarding glacial-interglacial ocean δ(13)C differences and allow paleo-δ(13)C variations to be understood within the context of modern climate variability. 相似文献
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Kleiven HK Kissel C Laj C Ninnemann US Richter TO Cortijo E 《Science (New York, N.Y.)》2008,319(5859):60-64
An outstanding climate anomaly 8200 years before the present (B.P.) in the North Atlantic is commonly postulated to be the result of weakened overturning circulation triggered by a freshwater outburst. New stable isotopic and sedimentological records from a northwest Atlantic sediment core reveal that the most prominent Holocene anomaly in bottom-water chemistry and flow speed in the deep limb of the Atlantic overturning circulation begins at approximately 8.38 thousand years B.P., coeval with the catastrophic drainage of Lake Agassiz. The influence of Lower North Atlantic Deep Water was strongly reduced at our site for approximately 100 years after the outburst, confirming the ocean's sensitivity to freshwater forcing. The similarities between the timing and duration of the pronounced deep circulation changes and regional climate anomalies support a causal link. 相似文献
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Ernani Machado de Freitas Lins Neto Iêda Ferreira de Oliveira Fabio Barros Britto Ulysses Paulino de Albuquerque 《Genetic Resources and Crop Evolution》2013,60(4):1389-1406
Plant domestication is an evolutionary process whose artificial selection and management change the landscape, modeling plants to satisfy the human needs, affecting the phenotype component(s) of the species under manipulation. This study aimed at examining and comparing two rural communities: Malhada de Areia e Carão, municipally of Altinho, Pernambuco regarding the knowledge, perception of morphological variations (size fruit, flavor fruit, shape fruit, yield pulp and fruit color), morphological characteristics of preference at the time of collection; evaluation on the inter- and intrapopulation morphological differences of species and assessment of diversity, variability and local genetic structure of Spondias tuberosa populations under different management regimes based on the ISSR analysis. The results pointed to the maintenance of local genetic and morphological diversity, being it strongly related to the management practices of the species, especially the S. tuberosa tolerance in open areas for farming and pasture. Thus, it is emphasized the importance of this study in Brazil by being the first time that aspects related to management and perceived diversity, morphology and genetics of a highlighted perennial species from the semi-arid region of northeastern Brazil are evaluated from the perspective of domestication studies on its incipient status. Moreover, it provides interesting data that will contribute to the conservation strategies and breeding programs. 相似文献
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Lamy F Kaiser J Ninnemann U Hebbeln D Arz HW Stoner J 《Science (New York, N.Y.)》2004,304(5679):1959-1962
Marine sediments from the Chilean continental margin are used to infer millennial-scale changes in southeast Pacific surface ocean water properties and Patagonian ice sheet extent since the last glacial period. Our data show a clear "Antarctic" timing of sea surface temperature changes, which appear systematically linked to meridional displacements in sea ice, westerly winds, and the circumpolar current system. Proxy data for ice sheet changes show a similar pattern as oceanographic variations offshore, but reveal a variable glacier-response time of up to approximately 1000 years, which may explain some of the current discrepancies among terrestrial records in southern South America. 相似文献
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