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1. chinaXiv:202102.00028 [pdf]

Taurine is found in rumen fluid, plasma and urine of beef cattle fed a ration containing sodium sulfate

Zhao, Yuchao ; Zhao, Guangyong
Subjects: Agriculture, Forestry,Livestock & Aquatic Products Science >> Animal Husbandry and Veterinary Medicine

Objective: The objectives of the experiment were to study the effects of dietary supplementation with sodium sulfate (Na2SO4) on taurine concentrations of plasma, urine and rumen fluid in steers. Methods: Six Simmental steers (bodyweight 449 ± 19 kg) were used as experimental animals. Three levels of Na2SO4, i.e. 0, 20 and 40 g/d, were added in a basal ration as experimental treatments. The animals and the dietary treatments were randomly allocated in a replicated 3 × 3 Latin square design. Each experimental period included 15 days for adaptation and 5 days for sampling. Rumen fluid, blood and urine were sampled from the steers during each sampling period. Results: Dietary addition with Na2SO4 at 40 g/d increased plasma taurine concentration (P < 0.05) and tended to increase the plasma taurine concentration with increasing Na2SO4 level in a linear manner (P = 0.052). A linear positive regression relationship was found between plasma taurine concentration (?g/mL) and sulfur intake (g/d) (R2 = 0.18, P = 0.046). Taurine was found in rumen fluid and urine. No differences were found in ruminal taurine concentrations or urinary taurine excretions among treatments (P > 0.05). Limitations: We infer that the taurine in rumen fluid should have come from the blood through saliva secretion or/and the rumen microbial synthesis. However, no reports are available on the hypothesis. Further research is needed to investigate the possible origins of ruminal taurine as well as the impacts of taurine on rumen microecosystem and fermentation. Conclusions: Taurine has been found in rumen fluid for the first time in the experiment. Dietary addition with Na2SO4 increased plasma taurine concentrations whereas it did not affect urinary taurine excretions in steers.

submitted time 2021-02-08 Hits1256Downloads633 Comment 0

2. chinaXiv:201705.00377 [pdf]

Graphene/Sulfur/Carbon Nanocomposite for High Performance Lithium-Sulfur Batteries

Jin, KK [Jin, Kangke][ 1 ]; Zhou, XF [Zhou, Xufeng][ 1 ]; Liu, ZP [Liu, Zhaoping][ 1 ]
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

Here, we report a two-step synthesis of graphene/sulfur/carbon ternary composite with a multilayer structure. In this composite, ultrathin S layers are uniformly deposited on graphene nanosheets and covered by a thin layer of amorphous carbon derived from β-cyclodextrin on the surface. Such a unique microstructure, not only improves the electrical conductivity of sulfur, but also effectively inhibits the dissolution of polysulfides during charging/discharging processes. As a result, this ternary nanocomposite exhibits excellent electrochemical performance. It can deliver a high initial discharge and charge capacity of 1410 mAh·g?1 and 1370 mAh·g?1, respectively, and a capacity retention of 63.8% can be achieved after 100 cycles at 0.1 C (1 C = 1675 mA·g?1). A relatively high specific capacity of 450 mAh·g?1 can still be retained after 200 cycles at a high rate of 2 C. The synthesis process introduced here is simple and broadly applicable to the modification of sulfur cathode for better electrochemical performance.

submitted time 2017-05-02 Hits531Downloads287 Comment 0

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