This test was conducted to study the effects of different doses of homologous probiotics on intestinal mucosa structure of 21-day-old broilers. A total of 1 500 one-day-old AA broilers with similar weight were randoml...This test was conducted to study the effects of different doses of homologous probiotics on intestinal mucosa structure of 21-day-old broilers. A total of 1 500 one-day-old AA broilers with similar weight were randomly divided into five groups, with 10 replicates in each group and 30 broilers （ half males and half fe- males） in each replicate. The broilers were fed with the diets containing five kinds of different doses of homologous probiotics. The broilers ate and drank freely during the test. The test lasted for 21 days. Histological and histochemical methods were taken to measure villi length, mucosal thickness, wall thickness and the ratio of villi length to crypt depth （V/C） of duodenum, jejunum and ileum of the 21-day-old broilers. The results showed that, the effects of 0.3% homologous probiotics on the intestinal mucosal stroctrue of 21-day-old broilers were the best, and values of villi length, V/C, mucosal thickness and intestinal wall thickness in the O. 3% homologous probiotics group reached the maximum. The effects on improving and enhancing the digestion and absorption of the broiler small intestine in the 0.3% homologous probiotics group were the best.展开更多
Polychlorinated biphenyls (PCBs) are ubiquitous, persistent and lipophilic environmental endocrine disrupters that can be biomagnified in human and animals including birds and thus to affect reproductive functions. Po...Polychlorinated biphenyls (PCBs) are ubiquitous, persistent and lipophilic environmental endocrine disrupters that can be biomagnified in human and animals including birds and thus to affect reproductive functions. Poultry meat and eggs contain a great deal of fat and possibly concentrate higher PCBs and other environmental contaminants such as dichlorodiphenyl-trichloroethane (DDT). In order to identify the adverse effects of PCBs and possible sexual difference on chicken gonadal development, Aroclor 1254 was injected into fertilized Hyline chicken eggs before incubation. Four groups of eggs received yolk injection of either peanut oil as control, 1, 10 or 100 μg/egg of Aroclor 1254 as treatment group, respectively. After hatching the gonads were removed for histological examination. Testicular structure was apparently changed and exhibited dramatic decrease in area of the transverse sections (1μg/egg, P【 0.01; 10 and 100 μg/egg, P【0.001), diameter (10 and 100 μg/egg, P 【0.05) and relative area of展开更多
In consideration of the high-density dislocations from the lithiation process of high-capacity electrodes in Li-ion batteries, in this paper, a new elastoplastic model is established to describe the diffusion-induced ...In consideration of the high-density dislocations from the lithiation process of high-capacity electrodes in Li-ion batteries, in this paper, a new elastoplastic model is established to describe the diffusion-induced deformation and damage fracture. With the help of the relative physical quantities and state of charge, the surface damage and fracture behaviors of electrode materials are discussed based on the elastic-perfectly plastic(PP) and the strain gradient plasticity(SGP) theories, respectively. The results show that the lithiation deformation could be alleviated by reducing the electrode scale, and the plastic flow can play an essential role in the extrusion ratcheting effect relating to the upper surface fracture. Furthermore, the interface damage is more likely to appear by increasing the initial bond stiffness at the upper surface, which has little effect on the later fracture. A strong size effect is also found in the damage and fracture critical curves for the PP and SGP models.展开更多
基金Supported by College Project of Beijing Vocational College of Agriculture(XYYF-12-14)
文摘This test was conducted to study the effects of different doses of homologous probiotics on intestinal mucosa structure of 21-day-old broilers. A total of 1 500 one-day-old AA broilers with similar weight were randomly divided into five groups, with 10 replicates in each group and 30 broilers （ half males and half fe- males） in each replicate. The broilers were fed with the diets containing five kinds of different doses of homologous probiotics. The broilers ate and drank freely during the test. The test lasted for 21 days. Histological and histochemical methods were taken to measure villi length, mucosal thickness, wall thickness and the ratio of villi length to crypt depth （V/C） of duodenum, jejunum and ileum of the 21-day-old broilers. The results showed that, the effects of 0.3% homologous probiotics on the intestinal mucosal stroctrue of 21-day-old broilers were the best, and values of villi length, V/C, mucosal thickness and intestinal wall thickness in the O. 3% homologous probiotics group reached the maximum. The effects on improving and enhancing the digestion and absorption of the broiler small intestine in the 0.3% homologous probiotics group were the best.
基金This work was supported by the Beijing Natural Science Foundation (Grant No. 6992019) the National Natural Sci- ence Foundation of China (Grant No. 39970535).
文摘Polychlorinated biphenyls (PCBs) are ubiquitous, persistent and lipophilic environmental endocrine disrupters that can be biomagnified in human and animals including birds and thus to affect reproductive functions. Poultry meat and eggs contain a great deal of fat and possibly concentrate higher PCBs and other environmental contaminants such as dichlorodiphenyl-trichloroethane (DDT). In order to identify the adverse effects of PCBs and possible sexual difference on chicken gonadal development, Aroclor 1254 was injected into fertilized Hyline chicken eggs before incubation. Four groups of eggs received yolk injection of either peanut oil as control, 1, 10 or 100 μg/egg of Aroclor 1254 as treatment group, respectively. After hatching the gonads were removed for histological examination. Testicular structure was apparently changed and exhibited dramatic decrease in area of the transverse sections (1μg/egg, P【 0.01; 10 and 100 μg/egg, P【0.001), diameter (10 and 100 μg/egg, P 【0.05) and relative area of
基金supported by the National Natural Science Foundation of China (Grant Nos. 11872054 and 11972157)the Natural Science Foundation of Hunan Province (Grant No. 2020JJ2026)the Science and Technology Innovation Project of Hunan Province (Grant No. 2018RS3091)。
文摘In consideration of the high-density dislocations from the lithiation process of high-capacity electrodes in Li-ion batteries, in this paper, a new elastoplastic model is established to describe the diffusion-induced deformation and damage fracture. With the help of the relative physical quantities and state of charge, the surface damage and fracture behaviors of electrode materials are discussed based on the elastic-perfectly plastic(PP) and the strain gradient plasticity(SGP) theories, respectively. The results show that the lithiation deformation could be alleviated by reducing the electrode scale, and the plastic flow can play an essential role in the extrusion ratcheting effect relating to the upper surface fracture. Furthermore, the interface damage is more likely to appear by increasing the initial bond stiffness at the upper surface, which has little effect on the later fracture. A strong size effect is also found in the damage and fracture critical curves for the PP and SGP models.
