The diterpenes from the plants of the genus Isodon (Labiatae) exhibited a relatively specific growth inhibitory activity against lepidopterous larvae. The α-methylene cyclo- pentanone moiety (D-ring) ...was essential for this activity. In addition, these compounds strongly inhibited the oxidative phosphorylation in mitochondria isolated from silkworm midgut.
The rendezvous and landing missions are very significant for scientific explorations. In such missions, the navigation and guidance based on image data is very important. The spacecraft Hayabusa ...performed the descent flights to the target asteroid Itokawa in November of 2005. To accurately determine the spacecraft position, a landmark tracking scheme with the help of the ground operation was introduced and developed in the Hayabusa mission. The Hayabusa project team developed new tools that combined human assist with the computer aided terminal display. The proposed landmark tracking scheme contributed to the successful precise navigation to the specified area on the surface. This paper presents a visual navigation method with the landmark tracking used for the Hayabusa mission.
The Japanese asteroid exploration spacecraft Hayabusa autonomously performed touchdown two times in November 2005. The autonomous guidance and navigation capability is installed aboard the ...spacecraft. The GNC system collects the laser altimeter, laser range finders and navigation cameras information aboard and is designed to estimate where the spacecraft is and to decide the path correction maneuvers. The programmed function includes the image processing designed to detect an artificial target marker location to approach and cancel the relative velocity. A terrain alignment maneuver is also accomplished by both altitude and attitude control. This paper presents how autonomous guidance and navigation was performed in Hayabusa mission
Three trans-clerodane diterpenoids, pilosanol A, B and C, the last compound being a glucoside, have been isolated from the roots of Portulaca pilosa. They show a marked contrast in skeletal type with ...the constituents of aerial part. Evolutionary changes in the biosynthetic abilities of Portulaca species is discussed.
In future planetary exploration missions, rovers are required to traverse over very rough terrain. Regolith, the soil that covers the Moon's surface, is easy to slide, causing rovers running on it ...get stuck. Some researchers have studied the mobility system for rovers. However the optimal and robust mobility systems have not been developed yet. For avoiding stuck-up, this paper proposes a new wheel system, considering the characteristics of the regolith
PDF
