In this paper,the extremals of curvature energy actions on non-null Frenet curves in 3-dimensional Anti-de Sitter space are studied.We completely solve the Euler-Lagrange equation by quadratures.By using the Killing f...In this paper,the extremals of curvature energy actions on non-null Frenet curves in 3-dimensional Anti-de Sitter space are studied.We completely solve the Euler-Lagrange equation by quadratures.By using the Killing fields,we obtain existence for closed general-ized elastica fully immersed in Anti-de Sitter space H_1~3.展开更多
[Objective] The aim of this study was to select an efficient and non-pol-luting method to kil the larva of fruit fly in citrus. [Method] The larvae of Bactrocera minax in citrus fruits were suffocated using plastic b...[Objective] The aim of this study was to select an efficient and non-pol-luting method to kil the larva of fruit fly in citrus. [Method] The larvae of Bactrocera minax in citrus fruits were suffocated using plastic bags with or without a certain concentration of pesticide. Then, the mortality of in different treatments was measured 24, 48, 60, 240 and 480 h later. Final y, variance analysis was carried out. [Result] There was no significant difference in the mortality between the two treatments： suffocating the larvae with sealed plastic bags containing no or a certain concentration of pesticide 5 d. later. The former had high mortality, but also was economic and without any pol ution. The orange maggots were more easier to be kil ed in sealed plastic bags. [Conclusion] Suffocating orange maggots with no-insec-ticide plastic bag is economic, efficient and has no pol ution to the environment.展开更多
The ingestion of probiotic lactic acid bacteria has been evaluated and noted that it has an effect on the balance of desirable microbiota in the gastrointestinal tract. Lactobacillus gasseri demonstrates good survival...The ingestion of probiotic lactic acid bacteria has been evaluated and noted that it has an effect on the balance of desirable microbiota in the gastrointestinal tract. Lactobacillus gasseri demonstrates good survival in the gastrointestinal tract, and it has been associated with a variety of probiotic activities and roles, including the reduction of fecal mutagenic enzymes, the production of bacteriocins and the stimulation of macrophages immunomodulation. The aim of the study was to evaluate the effects of a pool of L. gasseri strains isolated from the feces of breastfed infants added in the human milk of healthy women. The milk was both pasteurized and unpasteurized, to verify the cell cytotoxicity of macrophages and to quantify the production of immunologic mediators such as IL-4, IL-6, IFN-γ, TNF-α, NO and oxygen intermediary compounds （H2O2）. The administration of raw human milk and pasteurized human milk to infants is a regular, encouraged practice in units of intensive therapy （UITs） and our present investigation verified the beneficial effect of addition of a pool of L. gasseri to pasteurized human milk （PHML）. Our results show that probiotic supplementation helped to maintain cell viability, reduced IL-6 and IFN-γ production and stimulated TNF-α, NO, H2O2, IL-4 production. Nevertheless, the results indicate that the addition of lactobacillus to human milk was not a determinant in the production of TNF-α. L. gasseri added to breast milk did not present a cytotoxic risk, and the addition ofL. gasseri to pasteurized milk of human milk bank would benefit newborns that depend on milk banks for the colonization of more desirable microbiota.展开更多
The effects of melittin on growth and bacteriostasis of four pathogens were extensively investigated using scanning electron microscopy(SEM) and transmission electron microscopy(TEM).The results indicated that the mel...The effects of melittin on growth and bacteriostasis of four pathogens were extensively investigated using scanning electron microscopy(SEM) and transmission electron microscopy(TEM).The results indicated that the melittin had a marked bacteriostatic effect on the four pathogenic bacteria.Among these,E.cacotowora was influenced most powerfully and quickly,the yeast and F.fulva were the second,and the S.aureus was inhibited by a low concentration but was killed by a high concentration.It was observed in the experiments that melittin killed pathogenic bacteria in three ways.One was by pore formation.After integrating melittin into the plasma membrane,a vacuole was formed then penetrated,resulting in bacterial content leakage.The vacuole also experienced plasmolysis and the growing cavity destroyed the membrane.A third effect was the formation of vacuoles in the cells which induced the pycnosis of the cytoplasm resulting in a cell death.The mechanism of melittin bacteriostasis was the result of integrating melittin with phospholipod double layers of the plasmalemma and the endomembranes.展开更多
基金Supported by the NSF of China(10671066,10971066)Supported by the Shanghai Leading Academic Discipline Project(B407)
文摘In this paper,the extremals of curvature energy actions on non-null Frenet curves in 3-dimensional Anti-de Sitter space are studied.We completely solve the Euler-Lagrange equation by quadratures.By using the Killing fields,we obtain existence for closed general-ized elastica fully immersed in Anti-de Sitter space H_1~3.
文摘[Objective] The aim of this study was to select an efficient and non-pol-luting method to kil the larva of fruit fly in citrus. [Method] The larvae of Bactrocera minax in citrus fruits were suffocated using plastic bags with or without a certain concentration of pesticide. Then, the mortality of in different treatments was measured 24, 48, 60, 240 and 480 h later. Final y, variance analysis was carried out. [Result] There was no significant difference in the mortality between the two treatments： suffocating the larvae with sealed plastic bags containing no or a certain concentration of pesticide 5 d. later. The former had high mortality, but also was economic and without any pol ution. The orange maggots were more easier to be kil ed in sealed plastic bags. [Conclusion] Suffocating orange maggots with no-insec-ticide plastic bag is economic, efficient and has no pol ution to the environment.
文摘The ingestion of probiotic lactic acid bacteria has been evaluated and noted that it has an effect on the balance of desirable microbiota in the gastrointestinal tract. Lactobacillus gasseri demonstrates good survival in the gastrointestinal tract, and it has been associated with a variety of probiotic activities and roles, including the reduction of fecal mutagenic enzymes, the production of bacteriocins and the stimulation of macrophages immunomodulation. The aim of the study was to evaluate the effects of a pool of L. gasseri strains isolated from the feces of breastfed infants added in the human milk of healthy women. The milk was both pasteurized and unpasteurized, to verify the cell cytotoxicity of macrophages and to quantify the production of immunologic mediators such as IL-4, IL-6, IFN-γ, TNF-α, NO and oxygen intermediary compounds （H2O2）. The administration of raw human milk and pasteurized human milk to infants is a regular, encouraged practice in units of intensive therapy （UITs） and our present investigation verified the beneficial effect of addition of a pool of L. gasseri to pasteurized human milk （PHML）. Our results show that probiotic supplementation helped to maintain cell viability, reduced IL-6 and IFN-γ production and stimulated TNF-α, NO, H2O2, IL-4 production. Nevertheless, the results indicate that the addition of lactobacillus to human milk was not a determinant in the production of TNF-α. L. gasseri added to breast milk did not present a cytotoxic risk, and the addition ofL. gasseri to pasteurized milk of human milk bank would benefit newborns that depend on milk banks for the colonization of more desirable microbiota.
文摘The effects of melittin on growth and bacteriostasis of four pathogens were extensively investigated using scanning electron microscopy(SEM) and transmission electron microscopy(TEM).The results indicated that the melittin had a marked bacteriostatic effect on the four pathogenic bacteria.Among these,E.cacotowora was influenced most powerfully and quickly,the yeast and F.fulva were the second,and the S.aureus was inhibited by a low concentration but was killed by a high concentration.It was observed in the experiments that melittin killed pathogenic bacteria in three ways.One was by pore formation.After integrating melittin into the plasma membrane,a vacuole was formed then penetrated,resulting in bacterial content leakage.The vacuole also experienced plasmolysis and the growing cavity destroyed the membrane.A third effect was the formation of vacuoles in the cells which induced the pycnosis of the cytoplasm resulting in a cell death.The mechanism of melittin bacteriostasis was the result of integrating melittin with phospholipod double layers of the plasmalemma and the endomembranes.
