The effect of iron deficiency on heterocyst differentiation and some physiological properties of the filamentous cyanobacterium Anabaena sp. PCC 7120 was investigated. Under moderate iron limitation conditions, ac...
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The effect of iron deficiency on heterocyst differentiation and some physiological properties of the filamentous cyanobacterium Anabaena sp. PCC 7120 was investigated. Under moderate iron limitation conditions, achieved by addition of iron chelator 2,2′\|Dipyridyl (<80 μmol/L) led to delayed heterocyst differentiation, no heterocyst differentiation was observed under severe iron limitation conditions, when the concentration of 2,2′\|Dipyridyl in the medium was more than 100 μmol/L . It seemed that there are certain iron\|regulated genes or operons whose function is to control heterocyst development. In addition, iron deficiency impaired the growth. Low\|iron cells had a decrease in the quantities of pigment content (chlorophyll and phycocyanin content),the whole cell in vivo absorbance spectra confirmed the decrease, the protein electrophoretic profiles revealed that iron\|deficient cells had less protein bands, with the increase of 2,2′\|Dipyridyl ,the protein bands was more and more less. And differently, iron deficiency also caused an increase of ROS (Reactive Oxygen Species)and SOD activity, it suggests that iron deficiency led to oxidative stress, which generally occured under high\|iron conditions.
Silicon solid-state small satellite (or nano satellite) is a new kind of aerospace aircraft, which adopt ideas greatly different from the conventional method. The small satellite is composed of ASIMs, which make the c...
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Silicon solid-state small satellite (or nano satellite) is a new kind of aerospace aircraft, which adopt ideas greatly different from the conventional method. The small satellite is composed of ASIMs, which make the conventional complex system into a single system with IC and micro electronic mechanical system (MEMS) technologies. The fundamental principle of how to improve silicon-solid state small satellite in China is discussed here, as well as its application in special data store and forward communication. We also introduce our research of MEMS and its application in space. A practical design of data communication nano satellite about 15 KG in weight and 10 inch in line length is also given out.
Silicon solid-state small satellite (or nano satellite) is a new kind of aerospace aircraft, which adopts ideas greatly different from the conventional method. The small satellite is composed of ASIMs, which make the ...
详细信息
Silicon solid-state small satellite (or nano satellite) is a new kind of aerospace aircraft, which adopts ideas greatly different from the conventional method. The small satellite is composed of ASIMs, which make the conventional complex system into a single system with IC and MEMS technologies. The fundamental principle of how to improve the silicon-solid state small satellite is discussed, as well as its application in special data store and forward communication. We also introduce our research on MEMS application in space. A practical design of a data communication nano satellite about 15 kG in weight and 10 inch in line length is also given.
Silicon solid-state small satellite(or nano satellite) is a new kind of aerospace aircraft,which adopt ideas greatly different from the conventional *** small satellite is composed of ASIMs, which make the conventiona...
详细信息
Silicon solid-state small satellite(or nano satellite) is a new kind of aerospace aircraft,which adopt ideas greatly different from the conventional *** small satellite is composed of ASIMs, which make the conventional complex system into a single system with IC and micro electronic mechanical system(MEMS) *** fundamental principle of how to improve silicon-solid state small satellite in China is discussed here,as well as its application in special data store and forward *** also introduce our research of MEMS and its application in space.A practical design of data communication nano satellite about 15KG in weight and 10 inch in line length is also given out.
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