Search Results - (Author, Cooperation:S. P. Wang)

2018-12-04

Rockefeller University Press

0022-1007

1540-9538

Medicine

Neuroscience

2011-07-09

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

Animals ; *Conservation of Natural Resources ; *Endangered Species/statistics & numerical data ; Fisheries ; *Perciformes/physiology ; Population Dynamics ; Seafood/economics ; *Tuna/physiology

2018-06-21

American Physical Society (APS)

1098-0121

1095-3795

Physics

Electronic structure and strongly correlated systems

1365-2494

Blackwell Publishing Journal Backfiles 1879-2005

Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

The relative competitive ability of Artemisia frigida Willd. (C3, semi-shrub) and Cleistogenes squarrosa (Trin.) Keng (C4, perennial bunchgrass), grown in a greenhouse, was studied under three nitrogen fertilizer levels, three defoliation intensities and five competitive replacement series in a factorial arrangement. Relative yield total and the respective crowding coefficients for each species were calculated with reference to aboveground, below-ground and total biomass. The index of aggressivity was also determined relative to total biomass. Cleistogenes squarrosa was a consistently weak competitor at all nitrogen fertilizer and clipping levels compared with A. frigida. Artemesia frigida had a higher relative yield when grown in mixtures with C. squarrosa than in monocultures, whereas the yield of C. squarrosa was lower in mixtures with A. frigida than in monocultures. The relative competitive ability of A. frigida over C. squarrosa declined significantly at different clipping intensities with increasing nitrogen fertilizer. The interaction of nitrogen fertilizer with clipping was significant, although the clipping effect on aggressivity was not significant.

Electronic Resource

1365-2494

Blackwell Publishing Journal Backfiles 1879-2005

Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

A sulphur (S)-deficient top soil was used in a pot experiment to investigate the effect of S supply on shoot and root growth and development in alfalfa (Medicago sativa L.). The treatments consisted of three rates of addition of S: 0, 20 and 40 mg kg−1 soil and each was replicated four times. Alfalfa was harvested at 15, 30, 45, 60 and 75 d after seedling emergence.By the end of the experiment, plants with S supply had a significantly larger leaf area, heavier leaf, shoot and root dry weight per pot than controls. The effects of adding S also significantly increased plant height, basal stem diameter, chlorophyll concentration of young leaves, root length and root surface area compared with controls. The effects of S were greater on shoots than on roots. The ratio of root to shoot dry weight was 0·47 when S was supplied and 0·88 without added S, indicating that c. 0·32 and 0·47 of the total net photosynthate, produced with or without S supply, respectively, were used for the development of roots. Overall, overcoming S deficiency resulted in a significant increase in shoot and root growth.

Electronic Resource

1365-2494

Blackwell Publishing Journal Backfiles 1879-2005

Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

The sulphur status of four soils and 122 forage plants from the Inner Mongolia steppe was determined. The organic sulphur concentration ranged from 17 μg g–1 in the 0·2–0·4 m soil layer to 397 μg g–1 in the topsoil. The mean sulphate-S concentrations were 〈10 μg g–1; greater concentrations were found only in the chernozem soil. Biomass-S accounted for 0·018–0·028 of total S in four soils. Three-quarters of plant samples examined had 〈1·6 g kg–1 S, and 〉0·80 of them had an N:S ratio 〉14:1. More than 0·80 of the plants were deficient in S. There was a close relationship between plant-available soil sulphur concentrations and total plant sulphur concentrations. It was concluded that sulphur deficiency is widespread in the Inner Mongolia steppe and that sulphur fertilizer requirements should be evaluated.

Electronic Resource

1365-2761

Blackwell Publishing Journal Backfiles 1879-2005

Biology

Medicine

Electronic Resource

1476-4687

Nature Archives 1869 - 2009

Biology

Chemistry and Pharmacology

Medicine

Natural Sciences in General

Physics

[Auszug] Loyang is the ancient capital of nine dynasties, so samples collected from the city and nearby regions are suitable for archaeomagnetic research. The samples used in the present work are mainly of three types: (1) baked earth from ancient pottery or brick kilns and ovens in residential structures; ...

Electronic Resource

1436-5081

Springer Online Journal Archives 1860-2000

Mathematics

Abstract LetG be a locally compact group acting on a topological space. Here we define some boundedness conditions for the action. For a nondiscrete locally compact vector spaceV andg∈G L (V), layering structures forV and the projective spaceP (V) ofV are obtained. From the layering structures, we derive then density properties of subgroups ofG with boundedness conditions. We generalize the Borel density theorem and Prasad's theorem on automorphisms of algebraic semi-simple groups. Some new results onp-adic groups are added.

Electronic Resource

1432-1823

Springer Online Journal Archives 1860-2000

Mathematics

Electronic Resource

1432-0827

Osteocalcin ; Radioimmunoassay ; Bone formation ; Biochemical marker ; Dog

Springer Online Journal Archives 1860-2000

Biology

Medicine

Physics

Abstract The aim of this study was to develop a routine and reliable radioimmunoassay (RIA) for dog osteocalcin. Two peaks of dog osteocalcin were purified to apparent homogeneity according to N-terminal sequence analysis. Amino acid composition analysis suggested that the second peak was intact dog osteocalcin whereas the first peak could be a truncated molecule. High titer (〉1:5,000) anti-dog osteocalcin antisera were produced in rabbits. The antiserum recognized dog and rat osteocalcins but not that in serum of human, bovine, rabbit, mouse, guinea pig, or goat. A homologous RIA using anti-dog osteocalcin as the antibody and dog osteocalcin as the tracer and standard was developed. Taking advantages of the facts that (1) anti-dog osteocalcin crossreacted in parallel with rat osteocalcin and (2) purified rat osteocalcin is commercially available, we devised an approach that used rat osteocalcin as the tracer and standard, and anti-dog osteocalcin as the antibody to develop a heterologous RIA. This assay recognized dog serum osteocalcin and diluted in parallel with rat and dog osteocalcins. Quantitation was done using rat osteocalcin to construct standard curves, and results were expressed in ng/ml of rat osteocalcin-equivalent. The detection limit of the assay was 5 ng/ml rat osteocalcin-equivalent, and half-maximal displacement was seen at 30–40 ng/ml rat osteocalcin-equivalent. The inter-and intraassay variations were 16.1% and 8.5%, respectively. The assay accurately determined the amount of exogenously added dog osteocalcin in serum. The results quantitated with this RIA correlated well (r-0.975, n=86) with those obtained with the homologous RIA. Application of the heterologous assay to dogs of different age revealed that young dogs (3 months old) had 15-fold higher serum osteocalcin level than adult (〉2 years old) dogs. In summary, we have (1) purified dog osteocalcin; (2) produced an antiserum against it; and (3) developed a heterologous RIA that could accurately measure dog osteocalcin, and could be used routinely to measure dog osteocalcin.

Electronic Resource

1432-1297

Springer Online Journal Archives 1860-2000

Mathematics

Electronic Resource

1432-1297

Springer Online Journal Archives 1860-2000

Mathematics

Electronic Resource

1432-1807

Springer Online Journal Archives 1860-2000

Mathematics

Electronic Resource

1435-4373

Springer Online Journal Archives 1860-2000

Medicine

Abstract In order to determine whether there is serologic evidence ofChlamydia pneumoniae infection in young infants with acute lower respiratory tract infection, serum samples from 86 subjects aged less than 6 months were assayed for IgG and IgM antibodies toChlamydia pneumoniae using a microimmunofluorescence method. Infants hospitalized in Toronto, Canada, were enrolled between 15 March 1991 and 15 March 1992. No patient had infection determined by the serologic results. IgG antibody was detected at low concentrations in 32 patients, with an inverse relationship between titer and chronological age. In our setting,Chlamydia pneumoniae does not appear to be an important lower respiratory pathogen in young infants.

Electronic Resource

1435-4373

Springer Online Journal Archives 1860-2000

Medicine

Abstract The epidemiology ofChlamydia pneumoniae infection was studied in an outbreak in four farm families living close together in Denmark. Eleven of 20 members of the families studied had bronchitis or pneumonia characteristic ofChlamydia pneumoniae infection. Serologic evidence ofChlamydia pneumoniae as causative agent was strengthened by a high incidence of epidemic infection. Transmission within families and a high frequency of disease versus asymptomatic infection are two findings which deviate from epidemiological patterns ofChlamydia pneumoniae infection as currently known.

Electronic Resource

1435-4373

Springer Online Journal Archives 1860-2000

Medicine

Abstract This study was undertaken to characterize the epidemiology and clinical presentation of infection withChlamydia pneumoniae in a population composed primarily of middle-aged and older adults. Pharyngeal swabs and acute and convalescent phase sera were obtained from outpatients presenting with signs and symptoms of an acute respiratory infection. Sera were examined using the micro-immunofluorescence (MIF) test to detect antibody toChlamydia pneumoniae and complement fixation tests to detectMycoplasma pneumoniae, influenza A virus, influenza B virus, respiratory syncytial virus and adenovirus. Pharyngeal swab specimens were cultured forChlamydia pneumoniae and tested forChlamydia pneumoniae by the polymerase chain reaction (PCR). A total of 743 patients with a mean age of 40.5 ± 16.1 years were enrolled in the study. Twenty-one patients were serologically positive for acuteChlamydia pneumoniae infection in the MIF test. PCR was positive in 15 of the 20 serologically positive patients tested. AcuteChlamydia pneumoniae infection was identified in 3 % (2/76) of subjects with pneumonia, 5 % (12/247) of those with bronchitis, 5 % (3/61) of those with sinusitis only and 2 % (2/103) of those with pharyngitis only. Of the 21 patients withChlamydia pneumoniae infection, seven (mean age of 33 years) had an antibody pattern suggesting a primary infection while 14 (mean age of 54 years) had a reinfection pattern. Patients with reinfection had milder disease than those with primary infection. PCR testing in the current study confirms the previously proposed serologic criteria of acuteChlamydia pneumoniae infection.

Electronic Resource

1435-4373

Springer Online Journal Archives 1860-2000

Medicine

Abstract The distribution ofChlamydia trachomatis immunotypes (serovars) in Tahiti was studied by immunotyping of local isolates using monoclonal antibodies in the micro-immunofluorescence test. From 115 isolates obtained from the genital tracts of patients attending a sexually transmitted diseases clinic and other gynecological consultations, eight immunotypes were identified: E (51.3 %), F (16.5 %), G (13 %), H (5.2 %), J (6.9 %), D (3.5 %), K (1.7 %) and I (0.9 %). In addition, an isolate with mixed immunotypes, EJ (0.9 %), was observed. This distribution was compared with those in different geographical areas.

Electronic Resource

1435-4373

Springer Online Journal Archives 1860-2000

Medicine

Abstract This article reviews current knowledge ofChlamydia pneumoniae strain TWAR, a newly recognizedChlamydia organism that causes acute respiratory infection, especially atypical pneumonia. Information is included on the microbiology, classification and laboratory diagnosis of the organism. Details of a series of studies of both endemic and epidemic respiratory infections are reviewed to present information on both the clinical and epidemiological characteristics of infection with strain TWAR. Laboratory studies of antibiotic sensitivity and recommendations for treatment are presented.

Electronic Resource

0887-624X

Chemistry ; Polymer and Materials Science

Wiley InterScience Backfile Collection 1832-2000

Chemistry and Pharmacology

The effects of carbon blacks, chopped carbon fibers, and crushed carbon fibers on the crosslinking chemistry of a diglycidyl epoxy resin/m-phenylenediamine system were examined by infrared (IR) spectroscopy and differential scanning calorimetry (DSC). The carbon and graphite surfaces were given oxidizing and reducing treatment to simulate the surface treatment of carbon fibers used in the manufacture of composites. The oxidized carbon surfaces initially accelerated epoxy-amine reactions but inhibited the later stages of the reaction such that the final extent of cure was reduced. The oxidized carbons also preferentially adsorbed the amine curing agent, resulting in a stoichiometric imbalance at the interface.

12 Ill.

Electronic Resource