白条锦蛇耗氧量和耗氧率

测定了5种温度(14 、17、 20、 24和29℃)下,白条锦蛇的耗氧量及耗氧率.结果表明:在这5种温度条件下,白条锦蛇的耗氧量均随体质量的增加而明显增大,而白条锦蛇的耗氧率则刚好相反,随体质量的增加耗氧率反而减小; 另外,白条锦蛇的耗氧量、耗氧率与温度均呈显著的线性回归关系.在14～29℃白条锦蛇的耗氧量、耗氧率均随温度升高而增加,并得出耗氧量x0与温度t的一元线性回归方程:x0=-25.25+3.51t,耗氧率Q0与温度t的一元线性回归方程Q0=-230.25+27.14t.白条锦蛇的耗氧率与温度的变化关系,说明白条锦蛇的新陈代谢率随环境温度改变而改变,在14～29℃白条锦蛇的新陈代谢随环境温度升高而加快.     

Oxygen isotope zoning in garnet

Oxygen isotope zoning was examined within garnet with the use of the stable isotope laser probe. Four metamorphic garnets from the regional metamorphic terrane in Vermont and the skarn deposit at Carr Fork, Utah, were examined and were found to be concentrically zoned in delta(18)O values. The largest variations in delta(18)O values were observed in the regional metamorphic garnets, where delta(18)O values change by 3 per mil from core to rim. These oxygen isotope zoning profiles reflect the changes in the delta(18)O values of the rocks during garnet growth, which are caused by infiltration of fluids and by dehydration reactions during metamorphism.     

运输温度与时间对猪孤雌胚胎发育的影响

[目的]比较不同运输温度与时间对猪孤雌胚胎发育的影响,确立猪克隆胚胎的最佳运输温度与时间。[方法]研究不同温度（37、38、39℃）对孤雌胚胎卵裂率、囊胚率的影响;不同时间（2、3、4h）对孤雌胚胎卵裂率、囊胚率的影响。[结果]培养3h后,在39℃运输时,孤雌胚胎的卵裂率和囊胚率与37℃、38℃的卵裂率和囊胚率相比,差异显著（P〈0．05）;培养3h后,孤雌胚胎的卵裂率和囊胚率与培养2h、4h的卵裂率和囊胚率相比,差异显著（P〈0．05）。[结论]在39℃,3h内进行孤雌胚胎的运输,能获得较高的卵裂率、囊胚率。     

Oxygen consumption in pelagic marine sediments

Measurements in the interstitial waters of pelagic red clay and carbonate ooze sediments in the central equatorial Pacific show that the dissolved oxygen content decreases with depth and levels off at nonzero values. The supply of reactive organic carbon introduced by bioturbation limits oxygen consumption at depth in the sediment. These gradients should produce diffusive fluxes across the sediment-water interface that average about 8.8 x 10(-14) mole per square centimeter per second or 0.08 milliliter per square meter per hour.     

Oxygen isotope variation in stony-iron meteorites

Asteroidal material, delivered to Earth as meteorites, preserves a record of the earliest stages of planetary formation. High-precision oxygen isotope analyses for the two major groups of stony-iron meteorites (main-group pallasites and mesosiderites) demonstrate that each group is from a distinct asteroidal source. Mesosiderites are isotopically identical to the howardite-eucrite-diogenite clan and, like them, are probably derived from the asteroid 4 Vesta. Main-group pallasites represent intermixed core-mantle material from a single disrupted asteroid and have no known equivalents among the basaltic meteorites. The stony-iron meteorites demonstrate that intense asteroidal deformation accompanied planetary accretion in the early Solar System.     

Oxygen equilibrium of brachiopod Lingula hemerythrin

In contrast to hemerythrin from five different species of sipunculid worms, ecardine brachiopod Lingula hemerythrin has an oxygen equilibrium which is reversibly altered by pH changes, both the oxygen affinity (Bohr effect) and the interactions between oxygen-binding centers being a function of pH. The significance of these phenomena is discussed in view of the phylogenetic distribution of hemerythrin and the function of respiratory pigments.     

氧自由基及其清除剂

对氧自由基的产生、性质及检测方法进行综述 ,并介绍了氧自由基清除剂的种类、作用机理及应用 有关研究表明 ,氧自由基与人体的衰老和多种疾病密切相关     

卷口鱼耗氧规律的研究

卷口鱼（Ptychidio jordani)的耗氧量随着体重的增长而增加，关系式为Y＝0．3539X^0.5646。耗氧率却随着体重的增长而减少，关系式为Y＝0.3519X^-0.4340。水温和水流量对耗氧率都有影响。在一定水温范围内，耗氧率随着水温的上升而增加，关系式为Y＝0．0038X^1.2711,水温24－30℃时耗氧率变幅较小，24℃以下，30℃以上时耗氧率变幅较大。在一定的水流量范围内，耗氧率随着流量的增大而增加，关系式为Y＝0．0012X0.5086.卷口鱼的呼吸耗氧率存在较明显的昼夜变化，耗氧高峰出现在每日10：00－13：00和20：00－23：00，白天的耗氧率均大于晚上。     

Oxygen consumption of a flying bird

Budgerygahs (Melopsittacus undulatus) flew with a minimum oxygen consumption of 38 milliliters per gramhour at each of three speeds between 19 and 33 kilometers per hour in a recirculating wind tunnel. An oxygen debt accumulated in the first minute of flight and was repaid in the minute following cessation of flight. Frequency of wingbeat was independent of flight speed. The data suggest that flying budgerygahs have a higher cardiac output per kilogram of body weight than mammals and that flight muscle of the budgerygah is among the most metabolically active tissues known.