Modern dinoflagellate cysts found in surface sediments of Santa Cruz Island, Galapagos

Modern dinoflagellate cysts in surface sediments collected on Santa Cruz Island, Galapagos, are described, along with other palynomorphs such as microforaminiferal linings, tintinnid loricae, copepod eggs and acritarchs including Domasiella-like micro-remains and Halodinium spp. The dinoflagellate cyst assemblages mainly consisted of Spiniferites cf. scabratus (gonyaulacoid) followed by Brigantedinium spp. and Selenopemphix quanta (peridinioids). No gymnodinioid cysts were found. No remarkable differences in cyst composition and densities were recognized between stations. The cyst assemblages were characterized by low species diversity and low cyst concentrations in comparison with the Pacific coast of Guatemala and Peru. CDF Contribution Number 1019

Cyst and theca of Protoperidinium avellana (MEUNIER) BALECH, (Dinophyceae)

The theca-cyst relationship of Protoperidinium avellana (Meunier) Balech was reconfirmed in the incubation experiment of the living cysts recovered from Omura Bay, West Japan. Both cyst and motile forms of this species were described

Organic-walled dinoflagellate cysts from surface sediments of Nagasaki Bay and Senzaki Bay, West Japan

Modern dinoflagellate cysts recovered from surface sediments of Nagasaki Bay and Senzaki Bay, West Japan are described under the cyst-based classification. The characteristics of both cyst assemblages are discussed in comparison with previous records around the Japanese Island. Consequently, the cyst assemblages of Nagasaki Bay and Senzaki Bay are similar to that of Omura Bay, West Japan and they are strongly influenced by the warm water Tsushima current, because Spiniferites spp. abundantly occur

Dinoflagellate cysts and pollen in pelagic sediments of the northern part of the Philippin Sea

Pelagic assemblage of dinoflagellate cysts from the bottom sediments in the Philippin Sea shows the characteristic of an adundant occurrence of Impagidinium and lack or scarcity of Spiniferites and Operculodinium. Pollen and spores are also very rare and composed of only wind-pollinated taxa. Accumuration processes of these palynomorphs are discussed in comparison with the other trench assemblage

Organic-walled dinoflagellate cysts from surface sediments of Akkeshi Bay and Lake Saroma, North Japan

Modern dinoflagellate cysts recovered from surface sediments of Akkeshi Bay and Lake Saroma in Hokkaido, North Japan are described under the cyst-based classification. They contain ten genera and twenty-five species which include six new species of the Protoperidiniaceae (Brigantedinium grande, B. asymmetricum, B. irregulare, Lejeunecysta psuchra L.? epidoma, and Trinovantedinium pallidifulvum) and five indeterminate species. The dinoflagellate cyst assemblages in both Lake Saroma and Akkeshi Bay are characterized by the dominance of the protoperidiniacean cysts especially brown spherical Brigantedinium species and the scarcity of species of Spiniferites, Lingulodinium and Tuberculodinium. Comparison with the previous studies around the Japanese Islands, the assemblage is considered to represent a typical cold water one. Based on modern biological and physical oceanographic data in the world, the protoperidiniacean-dominated cyst assemblage suggests the high primary production in both upwelling and other eutrophy regions

Decades' long-term variations in NS-LMXBs observed with MAXI/GSC, RXTE/ASM and Ginga/ASM

We investigated the decades' long-term X-ray variations in bright low-mass X-ray binaries containing a neutron star (NS-LMXB). The light curves of MAXI/GSC and RXTE/ASM covers $\sim$ 26 yr, and high-quality X-ray light curves are obtained from 33 NS-LMXBs. Among them, together with Ginga/ASM, two sources (GX 3$+$1 and GX 9$+$1) showed an apparent sinusoidal variation with the period of $\sim 5$ yr and $\sim 10$ yr in the 34 yr light curve. Their X-ray luminosities were $(1-4)\times10^{37}$ erg s$^{-1}$ in the middle of the luminosity distribution of the NS-LMXB. Other seven sources (Ser X-1, 4U 1735--444, GX 9$+$9, 4U 1746$-$37, 4U 1708$-$40, 4U 1822$-$000, and 1A 1246$-$588) have also similar sinusoidal variation, although the profiles (amplitude, period, and phase) are variable. Compering the 21 sources with known orbital periods, a possible cause of the long-term sinusoidal variation might be the mass transfer cycles induced by the irradiation to the donor star.Comment: 18 pages, accepted to PAS

<Reports on the Sixteenth annual Meeting of the Tsukuba English Linguisic Society> Downstep in Japanese : Syntatic vs. Semantic Approach

It has been argued that the effect of downstep differently appears depending on the syntactic structure (Kubozono 1989, 1992 and Azuma 1992a, 1992b) or on the semantic information (Koori 1992a, 1992b) ..