GaN-based yellow light-emitting diodes(LEDs) on Si substrates are aged at a direct current density of 50 A/cm^2 for500 h. After the aging process, it can be found that the LEDs have a stable electrical property but th...GaN-based yellow light-emitting diodes(LEDs) on Si substrates are aged at a direct current density of 50 A/cm^2 for500 h. After the aging process, it can be found that the LEDs have a stable electrical property but their light output power is decayed by 4.01% at 35 A/cm^2. Additionally, the aging mechanism of GaN-based yellow LED is analyzed. It is found that the decay of light output power may be attributed to the following two reasons: one is the increase of Shockley–Rrad–Hall recombination and the other is the change of the transport path of holes via V-pits after aging, which may induce the radiative recombination current to decrease. In this paper, not only the aging mechanism of GaN-based yellow LED is investigated, but also a new possible research direction in LED aging is given.展开更多
The present study explored effects of L-glutamate(Glu)levels on growth,digestive and absorptive capability,and intestinal physical barrier functions of Jian carp(Cyprinus carpio).A total of 600 Jian carp(126.40±0...The present study explored effects of L-glutamate(Glu)levels on growth,digestive and absorptive capability,and intestinal physical barrier functions of Jian carp(Cyprinus carpio).A total of 600 Jian carp(126.40±0.21 g)were randomly distributed into 5 groups with 3 replicates each,fed diets containing graded levels of Glu(53.4[control],57.2,60.6,68.4,and 83.4 g/kg)for 63 d.Results showed compared with control diet,feed intake and percent weight gain(PWG)in fish fed 83.4 g of Glu/kg diet were increased and feed conversion ratio in fish fed 68.4 g of Glu/kg diet was decreased(P<0.05).Similarly,body crude protein and lipid contents in fish fed 68.4 g of Glu/kg diet were higher(P<0.05).The activities of trypsin and chymotrypsin in the hepatopancreas and intestine,and amylase,alkaline phosphatase(AKP),Na^+,K^+-ATPase(NKA),and creatine kinase(CK)in intestine were higher in fish fed 68.4 g of Glu/kg diet(P<0.05).Dietary Glu(57.2 to 83.4 g/kg diet)decreased malondialdehyde(MDA)and protein carbonyl(PCO)contents in the intestine(P<0.05).The activities of catalase(CAT),glutathione peroxidase(GPx),and glutathione S-transferase(GST)in the hepatopancreas and intestine were higher in fish fed 60.6 and 68.4 g of Glu/kg diets(P<0.05).Intestinal the glutathione reductase(GR)activity and glutathione(GSH)content in fish fed 60.6,68.4,and 83.4 g of Glu/kg diet were increased(P<0.05).The GPx1 a,GST,and nuclear factor erythroid 2-related factor 2(Nrf2)mRNA expressions in the intestine were up-regulated in fish fed 60.6 and 68.4 g of Glu/kg diet(P<0.05).The zonula occludens protein-1(ZO-1),occludin1,and claudin3 mRNA expressions were also up-regulated in fish fed 83.4 g of Glu/kg diet(P<0.05).Fish fed 68.4 g of Glu/kg diet had higher levels of claudin 2,claudin7,and protein kinase C(PKC)mRNA(P<0.05).These results indicated that Glu improved frsh growth,digestive and absorptive ability,and intestinal physical barrier functions.Based on the quadratic regression analysis of PWG,and MDA of the hepatopancreas and intestine,the optimal dietary Glu levels were estimated to be 81.97,71.06,and 71.36 g/kg diet,respectively.展开更多
基金Project supported by the National Natural Science Foundation for Young Scientists of China(Grant Nos.61704069 and 51602141)the National Key Research and Development Program of China(Grant No.2016YFB0400601)
文摘GaN-based yellow light-emitting diodes(LEDs) on Si substrates are aged at a direct current density of 50 A/cm^2 for500 h. After the aging process, it can be found that the LEDs have a stable electrical property but their light output power is decayed by 4.01% at 35 A/cm^2. Additionally, the aging mechanism of GaN-based yellow LED is analyzed. It is found that the decay of light output power may be attributed to the following two reasons: one is the increase of Shockley–Rrad–Hall recombination and the other is the change of the transport path of holes via V-pits after aging, which may induce the radiative recombination current to decrease. In this paper, not only the aging mechanism of GaN-based yellow LED is investigated, but also a new possible research direction in LED aging is given.
基金financially supported by National Key R&D Program of China(2019YFD0900200)National Natural Science Foundation of China(31702362)
文摘The present study explored effects of L-glutamate(Glu)levels on growth,digestive and absorptive capability,and intestinal physical barrier functions of Jian carp(Cyprinus carpio).A total of 600 Jian carp(126.40±0.21 g)were randomly distributed into 5 groups with 3 replicates each,fed diets containing graded levels of Glu(53.4[control],57.2,60.6,68.4,and 83.4 g/kg)for 63 d.Results showed compared with control diet,feed intake and percent weight gain(PWG)in fish fed 83.4 g of Glu/kg diet were increased and feed conversion ratio in fish fed 68.4 g of Glu/kg diet was decreased(P<0.05).Similarly,body crude protein and lipid contents in fish fed 68.4 g of Glu/kg diet were higher(P<0.05).The activities of trypsin and chymotrypsin in the hepatopancreas and intestine,and amylase,alkaline phosphatase(AKP),Na^+,K^+-ATPase(NKA),and creatine kinase(CK)in intestine were higher in fish fed 68.4 g of Glu/kg diet(P<0.05).Dietary Glu(57.2 to 83.4 g/kg diet)decreased malondialdehyde(MDA)and protein carbonyl(PCO)contents in the intestine(P<0.05).The activities of catalase(CAT),glutathione peroxidase(GPx),and glutathione S-transferase(GST)in the hepatopancreas and intestine were higher in fish fed 60.6 and 68.4 g of Glu/kg diets(P<0.05).Intestinal the glutathione reductase(GR)activity and glutathione(GSH)content in fish fed 60.6,68.4,and 83.4 g of Glu/kg diet were increased(P<0.05).The GPx1 a,GST,and nuclear factor erythroid 2-related factor 2(Nrf2)mRNA expressions in the intestine were up-regulated in fish fed 60.6 and 68.4 g of Glu/kg diet(P<0.05).The zonula occludens protein-1(ZO-1),occludin1,and claudin3 mRNA expressions were also up-regulated in fish fed 83.4 g of Glu/kg diet(P<0.05).Fish fed 68.4 g of Glu/kg diet had higher levels of claudin 2,claudin7,and protein kinase C(PKC)mRNA(P<0.05).These results indicated that Glu improved frsh growth,digestive and absorptive ability,and intestinal physical barrier functions.Based on the quadratic regression analysis of PWG,and MDA of the hepatopancreas and intestine,the optimal dietary Glu levels were estimated to be 81.97,71.06,and 71.36 g/kg diet,respectively.
