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| 1 | A novel heterogeneous Co(Ⅱ)-Fenton-like catalyst for efficient photodegradation by visible light over extended pH显示文摘A novel Co^Ⅱ-Fenton-like heterogeneous catalyst,(H3O)2[Co^Ⅱ(phen)(H2O)2]2[Mo^Ⅵ5O15(PO4)2]·4H2O (phen=1,10-phenanthroline,C12N2H8)(1),is synthesized and utilized for photocatalytic degradation of organic dyes and antibiotic in a wide range of pH.The experimental results show that 1 acting as the Fenton-like catalyst with H2O2 exhibits remarkable activity at pH 3–9 under vis-light irradiation and is merited with excellent recyclability and reusability.A variety of analytical methods,including in-situ electron paramagnetic resonance (EPR) spectroscopy and density functional theory (DFT) calculations,are applied to study the mechanism on generation of·OH and O2^·-radicals for photocatalytic degradation.It suggests that,unlike the classical Fenton process involving the redox transformation of the central cations,the generation of·OH and O2^·-radicals is associated with the substitution of the coordinating water molecules at Co(Ⅱ) by H2O2 and/or OOH^-,followed by the light-driven O–O bond cleavage and dissociation.The outcomes of this study are striking which overcome the obstacles in the classical Fe^Ⅱ-Fenton process,including the slow redox transformation between Fe(Ⅱ) and Fe(Ⅲ) and the production of massive iron precipitates especially at elevated pH.It opens up new avenues for the development of the high-performance Fenton(-like) catalysts for photocatalytic degradation over extended pH and provides new insight into the related process. | Wu-Hua Chen Jin-Hua Xiong Xue Teng Jin-Xiao Mi Zhi-Biao Hu Haifeng Wang Zuofeng Chen | 2020 | Science China Chemistry2020，63，12： | 5 |
| 2 | Dietary protein levels changed the hardness of muscle by acting on muscle fiber growth and the metabolism of collagen in sub-adult grass carp(Ctenopharyngodon idella)显示文摘Background:Nutrient regulation has been proven to be an effective way to improve the flesh quality in fish.As a necessary nutrient for fish growth,protein accounts for the highest proportion in the fish diet and is expensive.Although our team found that the effect of protein on the muscle hardness of grass carp was probably related to an increased collagen content,the mechanism for this effect has not been deeply explored.Moreover,few studies have explored the protein requirements of sub-adult grass crap(Ctenopharyngodon idella).Therefore,the effects of different dietary protein levels on the growth performance,nutritional value,muscle hardness,muscle fiber growth,collagen metabolism and related molecule expression in grass carp were investigated.Methods:A total of 450 healthy grass carp(721.16±1.98 g)were selected and assigned randomly to six experimen-tal groups with three replicates each(n=25/replicate),and were fed six diets with 15.91%,19.39%,22.10%,25.59%,28.53%and 31.42%protein for 60 d.Results:Appropriate levels of dietary protein increased the feed intake,percentage weight gain,specific growth rate,body composition,unsaturated fatty acid content in muscle,partial free amino acid content in muscle,and muscle hardness of grass carp.These protein levels also increased the muscle fiber density,the frequency of new muscle fibers,the contents of collagen and IGF-1,and the enzyme activities of prolyl 4-hydroxylases and lysyloxidase,and decreased the activity of matrix metalloproteinase-2.At the molecular level,the optimal dietary protein increased col-lagen type Iα1(Colα1),Colα2,PI3K,Akt,S6K1,La ribonucleoprotein domain family member 6a(LARP6a),TGF-β1,Smad2,Smad4,Smad3,tissue inhibitor of metalloproteinase-2,MyoD,Myf5,MyoG and MyHC relative mRNA levels.The levels of the myostatin-1 and myostatin-2 genes were downregulated,and the protein expression levels of p-Smad2,Smad2,Smad4,p-Akt,Akt,LARP6 and Smad3 were increased.Conclusions:The appropriate levels of dietary protein promoted the growth of sub-adult grass carp and improved muscle hardness by promoting the growth of muscle fibers,improving collagen synthesis and depressing collagen degradation.In addition,the dietary protein requirements of sub-adult grass carp were 26.21%and 24.85%according to the quadratic regression analysis of growth performance(SGR)and the muscle hardness(collagen content),respectively. | Min Dong Lu Zhang Pei Wu Lin Feng Weidan Jiang Yang Liu Shengyao Kuang Shuwei Li Haifeng Mi Ling Tang Xiaoqiu Zhou | 2023 | Journal of Animal Science and Biotechnology2023，14，2： | 1 |
| 3 | Effects of Dietary Soybean Stachyose and Phytic Acid on Gene Expressions of Serine Proteases in Japanese Flounder(Paralichthys olivaceus)显示文摘Soybean stachyose (SBS) and phytic acid (PA) are anti-nutritional factors (ANF) which have deleterious effects on the growth and digestibility in fish. The present research studied the effects of dietary SBS and PA on the expression of three serine protease genes in the liver of Japanese flounder (Paralichthys olivaceus). These genes are trypsinogen 1 (poTRY), elastase 1 (poEL) and chymotrypsinogen 1 (poCTRY). Eight artificial diets with graded levels of supplemented ANFs were formulated to 4 levels of SBS (0.00, 0.40, 0.80 and 1.50%), 4 levels of PA (0.00, 0.20, 0.40 and 0.80), respectively.Japanese flounder (initial weight 2.45 g ± 0.01 g) were fed with these diets for 10 weeks with three replications per treatment. At the end of 10 weeks, supplementation of 0.40% of dietary SBS or PA significantly increased the gene expression of poTRY and poCTRY (P<0.05). The same level of dietary SBS significantly decreased the gene expression of poEL. In comparison with the control group (ANF-free),dietary PA (0.2% and 0.8%) significantly decreased the gene expression of poTRY, poCTRY and poEL (P<0.05). However, excessive supplement of dietary SBS (1.5%) has no significant effects on these gene expressions (P>0.05). These results suggested that dietary SBS and dietary PA could directly affect the serine protease genes at the transcriptional level in Japanese flounder, and these genes'expression was more sensitive to dietary PA than to SBS under the current experimental conditions. | MI Haifeng MAI Kangsen ZHANG Wenbing WU Chenglong CAI Yinghua | 2011 | Journal of Ocean University of China2011，10，3： | 1 |
| 4 | Implications of vitamin D for flesh quality of grass carp(Ctenopharyngodon idella):antioxidant ability,nutritional value,sensory quality,and myofiber characteristics显示文摘Background Muscle represents a unique and complex system with many components and comprises the major edible part of animals.Vitamin D is a critical nutrient for animals and is known to enhance calcium absorption and immune response.In recent years,dietary vitamin D supplementation in livestock has received increased attention due to biological responses including improving shear force in mammalian meat.However,the vitamin D acquisition and myofiber development processes in fish differ from those in mammals,and the effect of vitamin D on fish flesh quality is poorly understood.Here,the influence of dietary vitamin D on fillet quality,antioxidant ability,and myofiber development was examined in grass carp(Ctenopharyngodon idella).Methods A total of 540 healthy grass carp,with an initial average body weight of 257.24±0.63 g,were allotted in 6 experimental groups with 3 replicates each,and respectively fed corresponding diets with 15.2,364.3,782.5,1,167.9,1,573.8,and 1,980.1 IU/kg vitamin D for 70 d.Results Supplementation with 1,167.9 IU/kg vitamin D significantly improved nutritional value and sensory quality of fillets,enhancing crude protein,free amino acid,lipid,and collagen contents;maintaining an ideal pH;and reduc-ing lactate content,shear force,and cooking loss relative to respective values in the control(15.2 IU/kg)group.Average myofiber diameter and the frequency of myofibers>50μm in diameter increased under supplementation with 782.5–1,167.9 IU/kg vitamin D.Levels of oxidative damage biomarkers decreased,and the expression of antioxi-dant enzymes and nuclear factor erythroid 2-related factor 2 signaling molecules was upregulated in the 1,167.9 IU/kg vitamin D treatment compared to respective values in the control group.Furthermore,vitamin D supplementation activated cell differentiation by enhancing the expression of myogenic regulatory factors and myocyte enhancer factors compared to that in the control group.In addition,supplementation with 1,167.9 IU/kg vitamin D improved protein deposition associated with protein synthesis molecule(target of rapamycin)signaling and vitamin D receptor paralogs,along with inhibition of protein degradation(forkhead box protein 1)signaling.Conclusions Overall,the results demonstrated that vitamin D strengthened antioxidant ability and myofiber devel-opment,thereby enhancing nutritional value and sensory quality of fish flesh.These findings suggest that dietary vitamin D supplementation is conducive to the production of nutrient-rich,high quality aquaculture products. | Yao Zhang Chaonan Li Xiaoqiu Zhou Weidan Jiang Pei Wu Yang Liu Hongmei Ren Lu Zhang Haifeng Mi Jiayong Tang Ruinan Zhang Lin Feng | 2023 | Journal of Animal Science and Biotechnology2023，14，6： | 0 |
| 5 | Dogs lacking Apolipoprotein E show advanced atherosclerosis leading to apparent clinical complications显示文摘Atherosclerotic cardiovascular disease resulting from dysregulated lipid metabolism is the leading cause of morbidity and mortality worldwide.Apolipoprotein E(ApoE)plays a critical role in cholesterol metabolism.Knockouts in lipid-metabolizing proteins including ApoE in multiple model organisms such as mice and rats exhibiting elevated levels of cholesterol have been widely used for dissecting the pathology of atherosclerosis,but few of these animal models exhibit advanced atherosclerotic plaques leading to ischemia-induced clinical symptoms,limiting their use for translational studies.Here we report hypercholesterolemia and severe atherosclerosis characterized by stenosis and occlusion of arteries,together with clinical manifestations of stroke and gangrene,in ApoE knockout dogs generated by CRISPR/Cas9 and cloned by somatic cell nuclear transfer technologies.Importantly,the hypercholesterolemia and atherosclerotic complications in F0 mutants are recapitulated in their offspring.As the ApoE-associated atherosclerosis and clinical manifestations in mutant dogs are more similar to that in human patients compared with those in other animal models,these mutant dogs will be invaluable in developing and evaluating new therapies,including endovascular procedures,against atherosclerosis and related disorders. | Hui Zhao Jianping Zhao Di Wu Zhaolin Sun Yang Hua Min Zheng Yumei Liu Qi Yang Xiahe Huang Yuan Li Yueshan Piao Yingchun Wang Sin Man Lam Huijuan Xu Guanghou Shui Yongjun Wang Haifeng Yao Liangxue Lai Zhuo Du Jidong Mi Enqi Liu Xunming Ji Yong Q.Zhang | 2022 | Science China(Life Sciences)2022，65，7： | 0 |
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