Transmission Electron Microscope (TEM) Technology was used to investigate the effect of 25,100 and 200 mg/kg copper on ultra-structure of root tip and leaf blade of wheat. Result showed that serious damage was found w...Transmission Electron Microscope (TEM) Technology was used to investigate the effect of 25,100 and 200 mg/kg copper on ultra-structure of root tip and leaf blade of wheat. Result showed that serious damage was found with Copper of 25,100 and 200 mg/kg. Plasmolysis,concentrated cytoplasm,chloroplast inflation,lamellar structure disturbance,capsule disappearance and disintegration,mitochondria structures ambiguity and vacuolization were all symptoms under Cu stress. There were positive correlation between concentration of coper stress and the degree of injury,and the degree of injury of copper were different in different organelles. Mitochondria were the most sensitive organelles,and there was patient difference in the same organelles of different parts.展开更多
An overview of photobioreactors now in use for production of microalgae world wide is presented, and the application of photobioreactors to the cultivation of microalgae is discussed in detail. It is pointed out that ...An overview of photobioreactors now in use for production of microalgae world wide is presented, and the application of photobioreactors to the cultivation of microalgae is discussed in detail. It is pointed out that high cell density and industrial production of microalgae can be achieved using many kinds of closed photobioreactors including fermentor, tubular and flat plate photobioreactors, and the cultivation of Spirulina, Chlorella, Dunaliella tertiolecta and Porphyridium cruentrim by photobioreactors can achieve higher and steadier productivity than the cultivation of microalgae by an open air system. More and more researches indicate that tubular and flat plate photobioreactors are the development trend for photobioreactors with bubbles and air lift stirrers, and high bright light emitting diodes are the most economic light source with great potential for future development of photobioreactors. Photobioreactors can also be used for the production of high value metabolite (EPA or DHA) using some microalgae species for energy development and environment protection.展开更多
Camellia oil has become an important plant oil in China in recent years,but its effects on non-alcoholic fatty liver disease(NAFLD)have not been documented.In this study,the effects of camellia oil,soybean oil,and oli...Camellia oil has become an important plant oil in China in recent years,but its effects on non-alcoholic fatty liver disease(NAFLD)have not been documented.In this study,the effects of camellia oil,soybean oil,and olive oil on NAFLD were evaluated by analyzing the fatty acid profiles of the plant oils,the serum lipids and lipoproteins of rats fed different oils,and by cytological and ultrastructural observation of the rats’hepatocytes.Analysis of fatty acid profiles showed that the polyunsaturated fatty acid(PUFA)n-6/n-3 ratio was 33.33 in camellia oil,12.50 in olive oil,and 7.69 in soybean oil.Analyses of serum lipids and lipoproteins of rats showed that the levels of total cholesterol and low-density lipoprotein cholesterol in a camellia oil-fed group(COFG)were lower than those in an olive oil-fed group(OOFG)and higher than those in a soybean oil-fed group(SOFG).However,only the difference in total cholesterol between the COFG and SOFG was statistically significant.Cytological observation showed that the degree of lipid droplet(LD)accumulation in the hepatocytes in the COFG was lower than that in the OOFG,but higher than that in the SOFG.Ultrastructural analysis revealed that the size and number of the LDs in the hepatocytes of rats fed each of the three types of oil were related to the degree of damage to organelles,including the positions of nuclei and the integrity of mitochondria and endoplasmic reticulum.The results revealed that the effect of camellia oil on NAFLD in rats was greater than that of soybean oil,but less than that of olive oil.Although the overall trend was that among the three oil diets,those with a lower n-6/n-3 ratio were associated with a lower risk of NAFLD,and the effect of camellia oil on NAFLD was not entirely related to the n-6/n-3 ratio and may have involved other factors.This provides new insights into the effect of oil diets on NAFLD.展开更多
How to confine a detonation in a combustor is a key issue of detonation applications in propulsion systems.Based on achieving schemes,detonations applied in the combustor,including pulse detonation wave(PDW),oblique d...How to confine a detonation in a combustor is a key issue of detonation applications in propulsion systems.Based on achieving schemes,detonations applied in the combustor,including pulse detonation wave(PDW),oblique detonation wave(ODW) and rotating detonation wave(RDW),are different from that described by the classic CJ theory in fine structures and its self-sustaining mechanisms.In this work,the cellular structures and flow fields of ODW and RDW were obtained numerically,and the fundamental characteristics and self-sustaining mechanisms of the detonations were analyzed and discussed.ODW front consists of three parts:the ZND-like front,the single-headed triple point front and the dual-headed triple point front.Cellular structures of RDW are heterogeneous,and the cell size near the outer wall is smaller than that near the inner wall.展开更多
基金Supported by Scientific and Technological Fund from China University of Mining and Technology (D200402)~~
文摘Transmission Electron Microscope (TEM) Technology was used to investigate the effect of 25,100 and 200 mg/kg copper on ultra-structure of root tip and leaf blade of wheat. Result showed that serious damage was found with Copper of 25,100 and 200 mg/kg. Plasmolysis,concentrated cytoplasm,chloroplast inflation,lamellar structure disturbance,capsule disappearance and disintegration,mitochondria structures ambiguity and vacuolization were all symptoms under Cu stress. There were positive correlation between concentration of coper stress and the degree of injury,and the degree of injury of copper were different in different organelles. Mitochondria were the most sensitive organelles,and there was patient difference in the same organelles of different parts.
文摘An overview of photobioreactors now in use for production of microalgae world wide is presented, and the application of photobioreactors to the cultivation of microalgae is discussed in detail. It is pointed out that high cell density and industrial production of microalgae can be achieved using many kinds of closed photobioreactors including fermentor, tubular and flat plate photobioreactors, and the cultivation of Spirulina, Chlorella, Dunaliella tertiolecta and Porphyridium cruentrim by photobioreactors can achieve higher and steadier productivity than the cultivation of microalgae by an open air system. More and more researches indicate that tubular and flat plate photobioreactors are the development trend for photobioreactors with bubbles and air lift stirrers, and high bright light emitting diodes are the most economic light source with great potential for future development of photobioreactors. Photobioreactors can also be used for the production of high value metabolite (EPA or DHA) using some microalgae species for energy development and environment protection.
基金Project supported by the Science and Technology Projects of Zhejiang Province(No.2017C2003),China。
文摘Camellia oil has become an important plant oil in China in recent years,but its effects on non-alcoholic fatty liver disease(NAFLD)have not been documented.In this study,the effects of camellia oil,soybean oil,and olive oil on NAFLD were evaluated by analyzing the fatty acid profiles of the plant oils,the serum lipids and lipoproteins of rats fed different oils,and by cytological and ultrastructural observation of the rats’hepatocytes.Analysis of fatty acid profiles showed that the polyunsaturated fatty acid(PUFA)n-6/n-3 ratio was 33.33 in camellia oil,12.50 in olive oil,and 7.69 in soybean oil.Analyses of serum lipids and lipoproteins of rats showed that the levels of total cholesterol and low-density lipoprotein cholesterol in a camellia oil-fed group(COFG)were lower than those in an olive oil-fed group(OOFG)and higher than those in a soybean oil-fed group(SOFG).However,only the difference in total cholesterol between the COFG and SOFG was statistically significant.Cytological observation showed that the degree of lipid droplet(LD)accumulation in the hepatocytes in the COFG was lower than that in the OOFG,but higher than that in the SOFG.Ultrastructural analysis revealed that the size and number of the LDs in the hepatocytes of rats fed each of the three types of oil were related to the degree of damage to organelles,including the positions of nuclei and the integrity of mitochondria and endoplasmic reticulum.The results revealed that the effect of camellia oil on NAFLD in rats was greater than that of soybean oil,but less than that of olive oil.Although the overall trend was that among the three oil diets,those with a lower n-6/n-3 ratio were associated with a lower risk of NAFLD,and the effect of camellia oil on NAFLD was not entirely related to the n-6/n-3 ratio and may have involved other factors.This provides new insights into the effect of oil diets on NAFLD.
基金supported by the National Natural Science Foundation of China (Grant No. 10872096)
文摘How to confine a detonation in a combustor is a key issue of detonation applications in propulsion systems.Based on achieving schemes,detonations applied in the combustor,including pulse detonation wave(PDW),oblique detonation wave(ODW) and rotating detonation wave(RDW),are different from that described by the classic CJ theory in fine structures and its self-sustaining mechanisms.In this work,the cellular structures and flow fields of ODW and RDW were obtained numerically,and the fundamental characteristics and self-sustaining mechanisms of the detonations were analyzed and discussed.ODW front consists of three parts:the ZND-like front,the single-headed triple point front and the dual-headed triple point front.Cellular structures of RDW are heterogeneous,and the cell size near the outer wall is smaller than that near the inner wall.
