Impact of Natural Forest Protection Program policies on forests in northeastern China   总被引：1，自引：0，他引：1  

Yasuto HORI  Tetsuya MICHINAKA  Yuichiro HIRANO  Satoshi TACHIBANA 《中国林学(英文版)》2011,13(3):231-238

This study analyzes the effects of the Natural Forest Protection Program (NFPP) on the restoration of forest resources in  相似文献   

Artoindonesianin L, a new prenylated flavone with cytotoxic activity from Artocarpus rotunda     

Tati Suhartati  Sjamsul Arifin Achmad  Norio Aimi  Euis Holisotan Hakim  Mariko Kitajima  Hiromitsu Takayama  Koichi Takeya 《Fitoterapia》2001,72(8)

A new prenylated flavone, named artoindonesianin L (1), was isolated from Artocarpus rotunda (Hout) Panzer (Moraceae). Its structure was elucidated as on the basis of spectroscopic evidence. Along with this new compound, four known phenolic compounds were also isolated from this plant and identified as artonins M (2) and E (3), cycloartobiloxanthone (4) and artonin O (5). All these compounds showed significant cytotoxicity against murine P388 leukemia cells.  相似文献   

The crown shape of an evergreen oak,Quercus glauca, in a hardwood community     

Hiroki Itô  Akihiro Sumida  Yuji Isagi  Koichi Kamo 《Journal of Forest Research》1997,2(2):85-88

The spatial pattern of the crown spread ofQuercus glauca in a hardwood community was investigated in order to consider the effect of the patterns on its survival in a secondary hardwood community. The shape of a crown was defined by the spatial spread of the leaves (PCM crown), and by the spread of their branches (elliptic cylinder crown). The stem volume growth rate of a tree was strongly correlated with the corresponding total leaf area, which was then significantly correlated with the defined crown volume. This indicated that the stem volume growth depended on the crown volume as well as the total leaf area. An increase in leaf area was largely attained by the spatial volume of the crown, not by an increase in the leaf area density. The leaves inside the crown began to spread horizontally relative to the crown size as the total leaf area and tree size increased. On the other hand, for the crowns representing the branch spread, the crown shape (crown width/depth ratio) did not differ by internal leaf area and tree size. Such a spatial pattern was likely to be adaptive for a species that dominates at a mid-stage of secondary sere.  相似文献   

Formation of a one-dimensional array of oxygen in a microporous metal-organic solid     

Kitaura R  Kitagawa S  Kubota Y  Kobayashi TC  Kindo K  Mita Y  Matsuo A  Kobayashi M  Chang HC  Ozawa TC  Suzuki M  Sakata M  Takata M 《Science (New York, N.Y.)》2002,298(5602):2358-2361

We report the direct observation of dioxygen molecules physisorbed in the nanochannels of a microporous copper coordination polymer by the MEM (maximum entropy method)/Rietveld method, using in situ high-resolution synchrotron x-ray powder diffraction measurements. The obtained MEM electron density revealed that van der Waals dimers of physisorbed O2 locate in the middle of nanochannels and form a one-dimensional ladder structure aligned to the host channel structure. The observed O-O stretching Raman band and magnetic susceptibilities are characteristic of the confined O2 molecules in one-dimensional nanochannels of CPL-1 (coordination polymer 1 with pillared layer structure).  相似文献   

Crystal structure of rhodopsin: A G protein-coupled receptor   总被引：2，自引：0，他引：2  

Palczewski K  Kumasaka T  Hori T  Behnke CA  Motoshima H  Fox BA  Le Trong I  Teller DC  Okada T  Stenkamp RE  Yamamoto M  Miyano M 《Science (New York, N.Y.)》2000,289(5480):739-745

Heterotrimeric guanine nucleotide-binding protein (G protein)-coupled receptors (GPCRs) respond to a variety of different external stimuli and activate G proteins. GPCRs share many structural features, including a bundle of seven transmembrane alpha helices connected by six loops of varying lengths. We determined the structure of rhodopsin from diffraction data extending to 2.8 angstroms resolution. The highly organized structure in the extracellular region, including a conserved disulfide bridge, forms a basis for the arrangement of the seven-helix transmembrane motif. The ground-state chromophore, 11-cis-retinal, holds the transmembrane region of the protein in the inactive conformation. Interactions of the chromophore with a cluster of key residues determine the wavelength of the maximum absorption. Changes in these interactions among rhodopsins facilitate color discrimination. Identification of a set of residues that mediate interactions between the transmembrane helices and the cytoplasmic surface, where G-protein activation occurs, also suggests a possible structural change upon photoactivation.  相似文献   

Control of regulatory T cell development by the transcription factor Foxp3   总被引：5，自引：0，他引：5  

Hori S  Nomura T  Sakaguchi S 《Science (New York, N.Y.)》2003,299(5609):1057-1061

  相似文献   

Crisis management of water shortage in an irrigation area with a pipeline network system     

Koichi?MiyamotoEmail author  Taihei?Yamamoto  Hisao?Anyoji 《Paddy and Water Environment》2004,2(2):59-65

Problems caused by water shortage in a paddy-field district with a pipeline network system are different from those in a district with an open channel system. Abnormally low rainfall in Japan caused a very serious water shortage in 1994. A survey was carried out in the Hokuriku region, about 300 km in the north of Tokyo, and a typical paddy cultivation area, to determine problems in irrigation practices caused by water shortage and to find countermeasures for the problems. The following results were obtained. A tank model was proposed to estimate water requirements at the field level. The results showed that the amount of rainfall during the irrigation period in 1994 was only 27.1% of an average year and the rate of water sufficiency at the field level was 70.6%. Then, a simulation method was proposed to estimate hydraulic phenomena in a pipeline network system. The result showed that the pipeline network system distributed water to each hydrant unequally during water shortage. Based on simulations, the methods to equalize water supply to each hydrant and to set up reuse system of water were proposed.  相似文献   

Harmonization of irrigation system development and ecosystem preservation in paddy fields     

Koichi Miyamoto 《Paddy and Water Environment》2007,5(1):1-4

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Development of a yield sensor for measuring individual weights of onion bulbs     

Bassam Qarallah  Koichi Shoji  Tsuneo Kawamura 《Biosystems Engineering》2008,100(4):511-515

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Occurrence of a temperate coastal flatfish,the marbled flounder Pseudopleuronectes yokohamae,at high water temperatures in a shallow bay in summer detected by acoustic telemetry     

Mitamura  Hiromichi  Arai  Nobuaki  Hori  Masakazu  Uchida  Keiichi  Kajiyama  Makoto  Ishii  Mitsuhiro 《Fisheries Science》2020,86(1):77-85

Fisheries Science - The marbled flounder Pseudopleuronectes yokohamae, a flatfish found in temperate coastal waters, is an important commercial species in the northwestern Pacific Ocean, but little...  相似文献