Sea-surface temperature from coral skeletal strontium/calcium ratios   总被引：1，自引：0，他引：1  

Beck JW  Edwards RL  Ito E  Taylor FW  Recy J  Rougerie F  Joannot P  Henin C 《Science (New York, N.Y.)》1992,257(5070):644-647

Seasonal records of tropical sea-surface temperature (SST) over the past 10(5) years can be recovered from high-precision measurements of coral strontium/calcium ratios with the use of thermal ionization mass spectrometry. The temperature dependence of these ratios was calibrated with corals collected at SST recording stations and by (18)O/(16)O thermometry. The results suggest that mean monthly SST may be determined with an apparent accuracy of better than 0.5 degrees C. Measurements on a fossil coral indicate that 10,200 years ago mean annual SSTs near Vanuatu in the southwestern Pacific Ocean were about 5 degrees C colder than today and that seasonal variations in SST were larger. These data suggest that tropical climate zones were compressed toward the equator during deglaciation.  相似文献   

A broad spectrum,one-step RT-PCR to detect <Emphasis Type="Italic">Satsuma dwarf virus</Emphasis> variants using universal primers targeting both segmented RNAs 1 and 2     

Shin-ichi Shimizu  Takao Ito  Takanori Miyoshi  Yasunobu Tachibana  Tsutae Ito 《Journal of General Plant Pathology》2011,77(6):326-330

Universal primers to detect Satsuma dwarf virus (SDV), including distantly related strains Citrus mosaic virus (CiMV), Navel orange infectious mottling virus (NIMV), and Hyuganatsu virus (HV), were tested in a convenient one-step RT-PCR assay. SDV was the most broadly detected using uSDVup/uSDVdo primers that specifically targeted a nucleotide sequence in the 3′-noncoding region that is conserved in both segmented RNAs 1 and 2 of SDV among the tested primers. Nucleotide sequence analysis confirmed that the amplified RT-PCR products could be derived from RNAs 1 or 2 of SDV variants, some of which had interesting genetic diversity.  相似文献   

Dual origin of the cultivated rice based on molecular markers of newly collected annual and perennial strains of wild rice species, Oryza nivara and O. rufipogon     

Shinsuke Yamanaka  Ikuo Nakamura  Hirokazu Nakai  Yo-Ichiro Sato 《Genetic Resources and Crop Evolution》2003,50(5):529-538

The direct ancestor of rice (Oryza sativa L.) is believed to be AA genome wild relatives of rice in Asia. However, the AA genome wild relatives involve both annual and perennial forms. The distribution of the retrotransposon p-SINE1-r2, a short interspersed nuclear element (SINE) at the waxy locus was analyzed in diverse accessions of the AA genome wild relatives of rice (O. rufipogon sensu lato). Most annual wild rice accessions had this retrotransposon, while most perennial types lacked this element, contradicting results to the previous studies. Results presented here suggest that O. sativa has dual origin that lead to indica-japonica differentiation. Results suggest the indica line of rice varieties evolved from the annual genepool of AA genome and the japonica varieties from the perennial genepool of AA genome wild rice.  相似文献   

Pressure-induced denaturation of monomer beta-lactoglobulin is partially irreversible: comparison of monomer form (highly acidic pH) with dimer form (neutral pH)     

Ikeuchi Y  Nakagawa K  Endo T  Suzuki A  Hayashi T  Ito T 《Journal of agricultural and food chemistry》2001,49(8):4052-4059

This study was conducted to assess the effect of high hydrostatic pressure on monomer beta-lactoglobulin (BLg) at acid pH by fluorescence spectroscopy under pressure and by circular dichroism (CD) and (1)H NMR spectroscopies after release of pressure. The intrinsic (tryptophan) fluorescence measurement and the study of 8-anilinonaphthalene-1-sulfonate (ANS) binding to BLg indicated that at pH 2.0 the recovery of center of spectral mass or ANS fluorescence was almost complete upon pressure release. No difference in (1)H NMR spectra was observed between pressurized and unpressurized BLg. In addition, NMR detection of the H/D exchange of aromatic protein indicated that the conformation of the vicinity of tryptophan residues could be refolded almost completely after release of pressure. These results seemingly confirm that the pressure-induced denaturation of BLg at pH 2.0 is reversible. However, cis-parinaric acid binding ability of pressurized BLg was largely lost, although its retinol binding ability was the same as its unpressurized one. Furthermore, CD spectra of the far-UV region and 2D NMR spectra evidently revealed the difference in the conformation of the molecule between unpressurized and pressurized BLg. These results are interpreted as an existence of partially fragile structure in the BLg molecule by high pressure.  相似文献   

Long-Term Observation of Fogwater Composition at two Mountainous Sites in Gunma Prefecture, Japan     

Hiroshi Tago  Hirokazu Kimura  Kunihisa Kozawa  Koichi Fujie 《Water, air, and soil pollution》2006,175(1-4):375-391

We made serial observations on acid fog at Mt. Akagi and Mt. Haruna, Japan for 5 years. The altitudes of the sampling sites were 1500 m (Mt. Akagi) and 1200 m (Mt. Haruna) above sea level, and the sites were approximately 30 km apart. The average liquid water content (LWC) at Mt. Akagi and Mt. Haruna was 74 mg m^?3 and 63 mg m^?3, respectively. The pH of fogwater was 2.72–7.14 (mean 3.71) at Mt. Akagi and 2.94–6.58 (mean 3.73) at Mt. Haruna. Our long-term observations indicate that there was no significant difference in the chemical components in fogwater at both sites except for ammonium ion. However, there were some cases where the chemical components of fogwater at each site were differed remarkably even in the concurrent fog event. Nitrate and sulfate ions contributed to acidification of fogwater at Mts. Akagi and Haruna and 95% of sulfate ion in the fogwater originated from air pollution. Ammonia gas in the air was the main neutralizer of acidity in fogwater. When absorption of excessive nitric acid gas over ammonia gas in the air occurred, the pH of fogwater was lowered. Our back trajectory analysis indicated that the fogwater at Mt. Akagi was mainly affected by an air mass from the Kanto Plain, including Tokyo, while the fogwater at Mt. Haruna was influenced by an air mass from large, western cities, such as Nagoya and Osaka, as well as Tokyo.  相似文献   

Detection and confirmation of toxoplasma oocysts in the soil.     

S Ito  K Tsunoda  Y Tsutsumi  T Matsui  H Nishikawa 《Nippon juigaku zasshi. The Japanese journal of veterinary science》1975,37(6):549-554

  相似文献   

An immunohistochemical study on the distribution of endocrine cells in the gastrointestinal tract of the pig     

H Ito  J Yamada  T Yamashita  Y Hashimoto  N Kudo 《Nippon juigaku zasshi. The Japanese journal of veterinary science》1987,49(1):105-114

  相似文献   

Inoculation with Dictyocaulus filaria larvae for the protection of cattle from Dictyocaulus viviparus infection     

S Ito 《Nippon juigaku zasshi. The Japanese journal of veterinary science》1982,44(6):925-931

  相似文献   

Leptospiral attachment to extracellular matrix of mouse fibroblast (L929) cells   总被引：4，自引：0，他引：4  

T Ito  R Yanagawa 《Veterinary microbiology》1987,15(1-2):89-96

The attachment of leptospires to the extracellular matrix (ECM) remaining after mouse fibroblast (L929) cells on coverslips had been solubilized with Triton X-100 was examined. Each highly virulent line of Leptospira interrogans serovar copenhageni, canicola and pomona attached to ECM more effectively than intermediately virulent and avirulent lines of the same strains, suggesting a correlation between virulence and attachment to ECM. Inhibition of the attachment of highly virulent copenhageni to ECM was found in the presence of the homologous immunoglobulin G Fab fragment.  相似文献   

Disinfectant effects of several chemicals against Toxoplasma oocysts.     

S Ito  K Tsunoda  K Shimada  T Taki  T Matsui 《Nippon juigaku zasshi. The Japanese journal of veterinary science》1975,37(3):229-234

  相似文献