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Heger J Van Phung T Krízová L Sustala M Simecek K 《Journal of animal physiology and animal nutrition》2003,87(1-2):52-65
Five balance experiments on growing pigs were carried out to study the marginal efficiency of utilization of isoleucine, leucine, valine, histidine and phenylalanine + tyrosine and to estimate their requirements for maintenance. Purified diets based on casein and crystalline amino acids as the sole source of N contained graded levels of each amino acid, corresponding to protein accretion rates of 0, 33, 66, 99 and 132 g/day, respectively. All other essential amino acids were given in a 30% excess. N retention increased linearly (p < 0.01) as the dietary concentration of the limiting amino acid increased. Based on linear regression equations relating amino acid deposition in body protein to amino acid intake, marginal efficiencies of ileal digestible amino acid utilization were calculated to be isoleucine - 0.81, leucine - 0.81, valine - 0.82, histidine - 1.17 and phenylalanine + tyrosine - 0.67. Extrapolating the regression equations to zero N retention, the daily requirements of amino acids for N equilibrium were estimated to be (mg/kg0.75) isoleucine - 18, leucine - 33, valine - 23, histidine - 14 and phenylalanine + tyrosine - 43. 相似文献
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Kayagaki N Phung Q Chan S Chaudhari R Quan C O'Rourke KM Eby M Pietras E Cheng G Bazan JF Zhang Z Arnott D Dixit VM 《Science (New York, N.Y.)》2007,318(5856):1628-1632
Production of type I interferon (IFN-I) is a critical host defense triggered by pattern-recognition receptors (PRRs) of the innate immune system. Deubiquitinating enzyme A (DUBA), an ovarian tumor domain-containing deubiquitinating enzyme, was discovered in a small interfering RNA-based screen as a regulator of IFN-I production. Reduction of DUBA augmented the PRR-induced IFN-I response, whereas ectopic expression of DUBA had the converse effect. DUBA bound tumor necrosis factor receptor-associated factor 3 (TRAF3), an adaptor protein essential for the IFN-I response. TRAF3 is an E3 ubiquitin ligase that preferentially assembled lysine-63-linked polyubiquitin chains. DUBA selectively cleaved the lysine-63-linked polyubiquitin chains on TRAF3, resulting in its dissociation from the downstream signaling complex containing TANK-binding kinase 1. A discrete ubiquitin interaction motif within DUBA was required for efficient deubiquitination of TRAF3 and optimal suppression of IFN-I. Our data identify DUBA as a negative regulator of innate immune responses. 相似文献
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Tran Lanh Danh Phung Luc Duc Pham Dung Viet Pham Dong Duy Nishiyama Masateru Sasaki Atsushi Watanabe Toru 《Paddy and Water Environment》2019,17(3):507-513
Paddy and Water Environment - Two consecutive pilot-scale experiments were conducted to investigate the potential reuse of treated municipal wastewater (TWW) as an irrigation source for cultivating... 相似文献
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Tran Van Do Phung Dinh Trung Mamoru Yamamoto Osamu Kozan Nguyen Toan Thang Dang Van Thuyet 《Journal of Sustainable Forestry》2018,37(1):1-14
Forest ecosystems can modify the atmospheric CO2 through biomass accumulation mostly in tree stems with diameter at breast height (DBH) ≥ 10 cm. Aboveground biomass increment (ΔAGB), and changes in stand AGB, no. stems and basal area (BA) were calculated from mortality, recruitment, and growth data of tree stems in tropical evergreen broadleaved forest, Central Highland Vietnam. Data were derived from ten 1-ha permanent plots established in 2004, where all stems with DBH ≥ 10 cm were tagged, identified to species, and measured for DBH in 2004 and 2012. In an 8-year duration, the increment was 53 ± 10 stems ha–1, 7.8 ± 0.3 m2 ha–1 for BA and 86.0 ± 4.6 Mg ha–1 for AGB. The stem mortality rate was 0.9% year–1 and the stem recruitment rate was 2.2% year–1. Annual ΔAGB was 10.8 Mg ha–1 year–1, equaling to 5.4 Mg C ha–1 year–1. Of which, tree stems of 35–80 cm DBH classes accounted for 65%. The results indicated that the forest is in stage of carbon sequestration. Any disturbances causing death of 35–80 cm DBH tree stems will much reduce carbon sequestration capacity and it will take a long time for AGB to return to pre-disturbance stage. 相似文献
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A field experiment was conducted to investigate the impact of simulated rat damage on grain yield in irrigated lowland rice in An Giang province, in the Mekong Delta of Vietnam. Rat damage was simulated by making a 45° cut at the base of the rice tillers about 3–5 cm above the soil surface. 0% (control), 5%, 10%, 25% and 50% of the tillers were removed at the tillering (25 days after sowing, DAS), panicle initiation (43 DAS), flowering (72 DAS) and ripening (87 DAS) stages. The total number of mature tillers, immature tillers and percent filled grains, the weight of 1000 grains and grain yields were recorded. The rice crop completely compensated by increased tillering and yield for tillers damaged up to 50% at the tillering stage. However, the damage and yield loss were highly variable. The ability of the rice crop to compensate at later stages progressively reduced. The implications for managing rat damage to rice crops are (1) rodent control activities should be applied before 10% of tillers are damaged at the tillering stage, and (2) a well balanced nitrogen supply during the tillering stage could potentially assist the rice plants to better compensate for rat damage. 相似文献
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A. Dobermann C. Witt D. Dawe S. Abdulrachman H.C. Gines R. Nagarajan S. Satawathananont T.T. Son P.S. Tan G.H. Wang N.V. Chien V.T.K. Thoa C.V. Phung P. Stalin P. Muthukrishnan V. Ravi M. Babu S. Chatuporn M. Kongchum J. Sookthongsa Q. Sun R. Fu G.C. Simbahan M.A.A. Adviento 《Field Crops Research》2008
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Despite being a leading shrimp exporter in the world market, shrimp farming in Vietnam is carried out by many small‐scale farmers who face constraints in complying with increasingly stringent food safety and sustainability standards. The best way for such small farmers to circumvent this paradox is to make effective integrations both horizontally and vertically. Using value chain and institutional economics approaches, this study determines the factors that influence the probability of horizontal and vertical integrations between the production and processing stages in the shrimp industry in Vietnam. Analysis results confirm that integrated shrimp aquaculture is much more effective than the traditionally small‐scale‐ and individual‐production mode. In addition, logit estimation results identify the key factors affecting integration, including effectiveness of the legal framework, production scale, infrastructure development, and farmers' skill and awareness. Several policy recommendations proposed to encourage the development of integration in shrimp farming in Vietnam could also be useful for other similar developing countries. 相似文献
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Lipid profiles of canine spermatozoa as revealed via matrix‐assisted laser desorption/ionization mass spectrometry
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LT Braga Jr. NRS Bravo KRA Belaz D Zampieri MN Eberlin VA Conforti 《Reproduction in domestic animals》2016,51(6):1055-1058
In this study, we investigated the ability of matrix‐assisted laser desorption/ionization mass spectrometry (MALDI‐MS) to characterize the lipid contents of canine spermatozoa. For that, samples of pure semen were analysed. Indeed, quite comprehensive lipid coverage was observed, and the most abundant phospholipid ions detected were from four phosphatidylcholines, that is those of m/z 760.6; 782.6; 808.6; and 830.6 and one of m/z 725.6 from a sphingomyelin. In conclusion, MALDI‐MS was found to offer an easy, fast, accurate, and sensitive analytical method for lipid profiling in canine spermatozoa and could be used as a tool to select sires by assessing the relationship between sperm lipid profiles and variables such as age and breeding history as well as to study the effects of cryopreservation on lipid contents. 相似文献
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