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Effect of Carotenoides on the in vitro Aggregation of Bacteriochlorophyll e
Hirabayashi, Hiroki,Ohmura, Satoshi,Ishii, Takasada,Uehara, Kaku Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
In order to investigate effect of the carotenoids (Car) on aggregation of Bacterochlorophyll (BChl) in chlorosome, we studied the spectral difference in aggregates of BChl e formed in the absence and presence of a few kinds of Car in dimethyl sulfoxide (DMSO) -water solution. The absorption spectra of aggregates made of only BChl e and those made of a mixture of BChl e and Car were almost the same. However, the kinetics and circular dichroism (CD) spectra of aggregate of these were markedly different by kind of Car. Specifically, the rate of aggregation for a mixture of BChl e and isorenietene that contains phenyl as end groupe was faster than that for only BChl e. CD spectra of aggregates made of a mixture of BChl e and isorenietene dramatically changed compared to that made of only BChl e. We propose that BChl might form several kinds of rod-like supramolecular structures to in the presence of some kind of Car in chlorosome.
Chikuma 강 중류 수역에서 하안 보호 공사가 Stenopsyche marmorata(Trichoptera)에 미치는 영향(Central Japan)
( Hirabayashi Kimio ),( Yachiyo Fukunaga ),( Goro Kimura ) 한국하천호수학회 2004 생태와 환경 Vol.37 No.4
Since a large bank-protection works project was undertaken during winter in the middle reaches of the Chikuma, the riverbed structure was drastically altered. In order to assess the short-term impact of bank-protection works on the abundance pattern of Stenopsyche marmorata (Trichoptera) from spring to early summer, we conducted an investigation on the capture of adults using light traps before and after construction work. The patterns of the daily capture of S. marmorata and the cumulative number of individuals were different before and after construction. Namely, after construction, the daily catch of adult numbers increased only slightly during the investigation periods. This suggested that the age structure of the S. marmorata larval population had changed in the construction area. Our data suggest that bank-protection projects impact the abundance pattern of adult caddis-flies in the river ecosystem.
Photoadaptation of Green Sulfur Photosynthetic Bacteria Chlorobium phaeobacteroides
Hirabayashi, Hiroki,Ohmura, Satoshi,Ishii, Takasada,Takaichi, Shinichi,Uehara, Kaku Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
Photoadaptation of Chlorobium (Cb.) phaeobacteroides was investigated under dim and strong light intensity. Absorption spectra of these whole cellIs were different each other. The Soret band intensity and the Qy bandwidth of BChl e in c디l grown under dim light intensity were smaller and more broadened than those under strong light intensity. From HPLC analysis of the pigments, total carotenoid (Car) / bacterochorolphyll (BChl) e ratio of cell increased wi1h increase of light intensities. But camposition of BChl e hamologs almost unchanged. Cb. phaeobacteroides contains 11 kinds of Car including isorenieratene and beta-isorenieratene as major Car. The campositions of Car were different for cells grown under dim and strong light intensities. In conclusion, Cb. phaeobacteroides changes total amount and canposition of Car to adapt various light intensities, while homolog canposition of BChle unchange.
Chikuma 강 상-중류 수역 수서곤충의 분포 양상(Central Japan)
( Hirabayashi Kimio ),( Goro Kimura ),( Yachiyo Fukunaga ) 한국하천호수학회 2004 생태와 환경 Vol.37 No.4
The species composition and abundance of aquatic insects were investigated by light trap in summer, 2002 at three stations in the Chikuma River, Japan`s longest river. A total of 3278 adults/day were collected, the great majority (57.5%) of which were Diptera, followed by Trichoptera (35.4%) and then Ephemeroptera (7.1%). The number of collected aquatic insects and their biomass gradually increased towards downstream, whereas the number of species and species diversity index (H`) decreased. 36 species (H` = 4.30) of aquatic insects were collected at St. 1, versus 31 species (H` = 2.81) at St. 3. Moreover, the relative abundance of functional feeding groups changed from St. 1 to St. 3, i.e., collectors increased and shredders decreased.