If It's Tuesday, This Must Be ... Heraklion?: Greek-born, U.S.--trained scientists return home to Crete to carry on research in laser science, computers, math, and biology     

Dickson D 《Science (New York, N.Y.)》1989,243(4890):470-471

  相似文献   

Referral of cases          下载免费PDF全文

Landsberg G  McLean D 《The Canadian veterinary journal. La revue veterinaire canadienne》1989,30(9):705

  相似文献   

Prevalence of gastrointestinal nematodes in dairy heifers in western Canada   总被引：3，自引：2，他引：1       下载免费PDF全文

Cox WR  Lemiski D 《The Canadian veterinary journal. La revue veterinaire canadienne》1989,30(8):666-668

A survey was conducted to estimate the prevalence of gastrointestinal nematodes in grazing dairy replacement heifers in western Canada. Fecal samples were collected from 566 animals on 34 farms distributed over the three prairie provinces. Fecal egg counts were performed using a modified Wisconsin centrifugation technique. The overall mean farm fecal egg count was 16.0 eggs per gram feces (range 0.7-78.1 epg). Gastrointestinal nematodes were demonstrated on every farm examined, and 93.3% of all individuals tested were positive.  相似文献   

British Columbia. Incursion of bluetongue virus type 11 and epizootic hemorrhagic disease of deer type 2 for two consecutive years in the Okanagan Valley   总被引：1，自引：1，他引：0       下载免费PDF全文

Gc D  C D  Dj M  A A  Ea T  D W  W S 《The Canadian veterinary journal. La revue veterinaire canadienne》1989,30(4):351

  相似文献   

Ephemeral fever in an eight-month-old Thai dairy heifer          下载免费PDF全文

Hall D 《The Canadian veterinary journal. La revue veterinaire canadienne》1989,30(4):352

  相似文献   

Integration of sapflow velocity in elliptical stems     

Hatton TJ  Greenslade D  Dawes WR 《Tree physiology》1992,11(2):185-196

The estimation of water flux through the stem of a plant by point estimates based on the heat pulse technique requires integration of the velocity profile. The polynomial integration method and the weighted average technique both assume radial symmetry about the bole. A method is introduced that solves the equations for the ellipse in the weighted average technique, and includes an optimizing algorithm for the placement of sensors. The sensitivity of sapflow estimates through stems to increasing eccentricity is examined by means of analytical solutions and simulation. The error in sap flux measurement resulting from the radial approximation of the sapwood conducting area is expressed analytically and shown to be small over the range of eccentricities (e < 0.8) expected in nature. Simulations where radial symmetry is assumed for elliptical stems show substantial error in mean velocity (and thus flux) with modest eccentricities (e > 0.4).  相似文献   

Response: does macroscopic quantum coherence occur in ferritin?     

Gider S  Awschalom DD  Divincenzo DP  Loss D 《Science (New York, N.Y.)》1996,272(5260):425-426

  相似文献   

Effects of elevated CO(2) concentration on leaf characteristics and photosynthetic capacity of beech (Fagus sylvatica) during the growing season     

Epron D  Liozon R  Mousseau M 《Tree physiology》1996,16(4):425-432

Two-year-old beech (Fagus sylvatica L.) saplings were planted directly in the ground at high density (100 per m(2)), in an experimental design that realistically mimicked field conditions, and grown for two years in air containing CO(2) at either ambient or an elevated (ambient + 350 ppm) concentration. Plant dry mass and leaf area were increased by a two-year exposure to elevated CO(2). The saplings produced physiologically distinct types of sun leaves associated with the first and second growth flushes. Leaves of the second flush had a higher leaf mass per unit area and less chlorophyll per unit area, per unit dry mass and per unit nitrogen than leaves of the first flush. Chlorophyll content expressed per unit nitrogen decreased over time in plants grown in elevated CO(2), which suggests that, in elevated CO(2), less nitrogen was invested in machinery of the photosynthetic light reactions. In early summer, the photosynthetic capacity measured at saturating irradiance and CO(2) was slightly but not significantly higher in saplings grown in elevated CO(2) than in saplings grown in ambient CO(2). However, a decrease in photosynthetic capacity was observed after July in leaves of saplings grown in CO(2)-enriched air. The results demonstrate that photosynthetic acclimation to elevated CO(2) can occur in field-grown saplings in late summer, at the time of growth cessation.  相似文献   

What Is Your Diagnosis?     

Blischok D  Bender H 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》1996,25(4):113-114

  相似文献   

The idea of chemistry     

Barkan D 《Science (New York, N.Y.)》1994,265(5171):551-552

  相似文献