共查询到20条相似文献，搜索用时 22 毫秒
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从保护中华白海豚及其柄息环境并兼顾沿海工业的发展角度,提出了保护区的调整方案,并对功能区调整后对中华白海豚的影响进行了系统分析.
Abstract：
From the protection of Chinese white dolphin and living environment,and considering the industrial development in coastal areas,we put forward adjustment program for Jiangmen Chinese White Dolphin Provincial Nature Reserve.Meanwhile we analyzed the feasibility of this program by systematically focusing the effect of adjusted functional regions on Chinese white dolphin. 相似文献
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[目的]了解自有YB菌株在BOD生物传感器及河豚毒素毒性传感器中的作用。[方法]以YB菌株作为响应菌株,采用夹层膜法制作固定化微生物膜,组装成微生物传感器并测试其性能。[结果]YB菌株在33℃,pH为7.2的条件下对BOD响应良好,在此条件下静态法测得传感器标准曲线为y=0.061 2x-0.001 3,线性相关系数为0.995;动态法测得传感器标准曲线为y=0.072 2x-0.031 9,线性相关系数为0.996。同时,YB菌株对河豚毒素基本没有响应。[结论]自有YB菌株可以作为BOD微生物传感器的敏感菌,但不能作为河豚毒素毒性传感器测试菌株。 相似文献
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E S Herald R L Brownell F L Frye E J Morris W E Evans A B Scott 《Science (New York, N.Y.)》1969,166(911):1408-1410
The blind river dolphin (Platanista gangetica), first written about by Pliny the Elder in A.D. 72, was found (10 November 1968) to be the first known side-swimming cetacean. The rudimentary eye lacks the lens, but anatomical evidence suggests that the eye may serve as a light sensor. The underwater sound emissions of this species, although similar to those of the Amazon River dolphin (Inia geoffrensis), appear to be produced constantly. 相似文献
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Although humans have difficulty whistling when in a habitat that is more than 20 meters underwater, dolphins can make certain sounds at great depths through a related mechanism. Other dolphin sounds, such as clicks and complex buzzes, are produced by vibrations of the tissue of the nasal plugs, apparently without the use of the larynx; in these instances, the air sacs act as reservoirs. This was determined from studies of Tursiops truncatus and Delphinus delphis with harmless ultrasonic beams projected noninvasively to determine movements of the air sacs. 相似文献
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Unusual retinal cells in the dolphin eye 总被引：1，自引：0，他引：1
By comparison to the cellular constituents of the retinas of certain other diving mammals, the elements of the dolphin retina include an unusually large number of specialized cells. Both cone and rod receptors may be identified. An unusual amacrine cell may be seen which produces a process that spans the cells between the inner plexiform and outer plexiform layers. Most unusual is a layer of giant ganglion cells which appears to serve most of the central retina. The giant ganglion cells support giant dendrites and optic nerve fibers which range up to 8 micrometers in diameter. 相似文献
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The sonic emissions of the bottlenose dolphin are remarkably complex. Three classes of these sounds are discussed and presented graphically. The sine-type wave whistles range in frequency from about 4000 to 18,000 cycles per second. The clicks contain components of this same frequency range plus some components of higher frequencies. Complex waves of high amplitude and of many frequencies are also emitted in water or in air. Situations in which sounds of one or more of these classes can be elicited simultaneously from one and from two restrained animals are described. The necessity for, and occurrence of, creakings for purpose of navigation, ranging, and recognition (sonar) have been eliminated in the experiments under discussion. 相似文献
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旨在克隆西藏类乌齐牦牛乳酸脱氢酶(LDHB)基因并检测其组织表达情况,为给进一步研究LDHB在高海拔地区的极端低氧适应性及能量代谢中的调控作用提供依据。结果表明,类乌齐牦牛LDHB基因CDS区全长1 004bp,编码334个氨基酸,存在2处碱基突变,导致密码子分别由AAG→GAG(赖氨酸→谷氨酸)、ATC→AGC(异亮氨酸→丝氨酸);编码蛋白分子质量为36.72ku,为疏水稳定性蛋白,功能预测在糖酵解及氧化还原等过程中发挥主要功能;系统进化树表明,西藏类乌齐牦牛与九龙牦牛、黄牛的氨基酸序列相似性最高,亲缘关系最近,其次为山羊、宽吻海豚、猪、马、羊驼和野生双峰骆驼,与鸡、乌鸦、非洲爪蟾和鲤鱼较远;定量分析显示,LDHB基因在牦牛肺脏中的表达水平显著高于心脏和肝脏,推测该基因与牦牛抗缺氧性状相关。 相似文献
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王辉 《安徽农业大学学报》2010,(5):32-35
会计目标的多元化要求会计计量属性的多元化,虚拟经济与实体经济并存要求公允价值计量与历史成本计量（含摊余成本计量）并存。金融危机的启示是,历史成本计量与公允价值计量各有优劣,谁也不能取代另一方而独立存在。后金融危机时代的会计计量模式必然是历史成本计量与公允价值计量相融合的双重计量模式,这是历史的选择,也是理性的选择。 相似文献
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Hardee HC 《Science (New York, N.Y.)》1983,222(4619):47-48
Convective heat flow measurements of a basaltic lava flow were made during the 1983 eruption of Kilauea volcano in Hawaii. Eight field measurements of induced natural convection were made, giving heat flux values that ranged from 1.78 to 8.09 kilowatts per square meter at lava temperatures of 1088 and 1128 degrees Celsius, respectively. These field measurements of convective heat flux at subliquidus temperatures agree with previous laboratory measurements in furnace-melted samples of molten lava, and are useful for predicting heat transfer in magma bodies and for estimating heat extraction rates for magma energy. 相似文献
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B超活体测定猪背膘厚和眼肌面积的研究 总被引：3，自引：0，他引：3
应用B超仪对 3个猪种共 2 0头猪的背膘厚、眼肌面积进行了活体测定 ,分析其测定结果与A超活体、屠宰后胴体及胴体瘦肉率的关系 ,探讨B超在猪育种中的应用价值。结果表明 :同一性状B超活体测定值与A超活体、胴体之间的相关性极显著 (p <0 .0 1) ;B超活体测定猪背膘厚与胴体瘦肉率为负相关 ,B超活体测定眼肌面积与胴体瘦肉率为正相关 ,皆达极显著水平 (p <0 .0 1) ,并建立了胴体瘦肉率对B超活体测定背膘厚和眼肌面积的二元线性回归方程。 相似文献
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出口金枪鱼中金黄色葡萄球菌测定方法比较 总被引：1，自引：0，他引：1
[目的]比较出口食品中金黄色葡萄球菌测定的2种方法。[方法]将出口食品中金黄色葡萄球菌测定方法（SN0172-92法和ISO6888法）,同时应用于洪泽湖食品厂经熟加工的金枪鱼的检测,比较2种方法的实效性和实用性。[结果]2种方法在检测结果上无实质差异,有较好的一致性,但存在一些不同之处：SN0172-92法计数准确性高,ISO6888法耗时短,成本低。[结论]SN0172-92法的耗时长,成本高,但精确度高。 相似文献
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The Copernicus Orbiting Astronomical Observatory was used to obtain measurements of Mars Lyman-alpha (1215.671-angstrom) emission at the solar minimum, which has resulted in the first information on atomic hydrogen concentrations in the upper atmosphere of Mars at the solar minimum. The Copernicus measurements, coupled with the Viking in situ measurements of the temperature (170 degrees +/- 30 degrees K) of the upper atmosphere of Mars, indicate that the atomic hydrogen number density at the exobase of Mars (250 kilometers) is about 60 times greater than that deduced from Mariner 6 and 7 Lyman-alpha measurements obtained during a period of high solar activity. The Copernicus results are consistent with Hunten's hypothesis of the diffusion-limited escape of atomic hydrogen from Mars. 相似文献
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In our article "Airborne studies of the smoke from the Kuwait oil fires" (15 May, p. 987) (1), we stated that the depletions of sulfur dioxide (SO(2)) and nitrogen oxides (NO(x)) in the smoke plume from the Kuwait oil fires were 50 and 60% per hour, respectively. These values were derived from measurements made aboard a Convair C-131 aircraft, and measurements of CO(2) were used as a conserved tracer. Subsequent comparisons of these measurements of CO(2) (which were obtained from a continuous analyzer) with independent measurements of CO(2) (obtained from "grab" samples) revealed that the continuous CO(2) measurements were occasionally contaminated by cabin air. Recalculation of the depletion rates of SO(2) and NO(x), with the use of uncontaminated measurements of CO(2) from the "grab" sampler aboard the aircraft yielded values of 6 and 22%, respectively (2). Our conclusions with regard to the climatic effects of the Kuwait oil fires are unchanged. 相似文献
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The 2.3-gigahertz log-amplitude fluctuations observed in the radio links of the Pioneer Venus entry probes during Venus encounter have been used to study turbulence in the Venus atmosphere. The deduced estimates of the upper bound of structure constant c(n) of the refractive index fluctuations (c(n) less, similar 4 x 10(-8) cm(-(1/3))) are inconsistent with similar entry probe measurements by Veneras 4 to 8 but are consistent with the radio occultation measurements by flyby (Mariners 5 and 10) and orbiting (Venerat 9) spacecraft. The Pioneer Venus measurements therefore provide a resolution of the long-standing order of magnitude discrepancy between these earlier measurements of c(n). 相似文献
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本文着重从以下几个方面验证了新研制的气孔计测定结果的可靠性。１．气孔计测定值与印迹法测量结果相比较，证明两者呈直线正相关，相关系数为０．９７；２．气孔计测定值与渗入法测量结果相比较，证明两者也呈直线正相关，相关系数为０．９８；３．气孔计测定的日变化曲线与蒸腾强度的日变化曲线相吻合；４．对同一叶片上、下表皮的测定结果也表明：气孔计值能够客观地反映气孔开度。 相似文献
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Hsui AT 《Science (New York, N.Y.)》1987,237(4817):881-883
It has been reported that the geophysically determined Newtonian gravitational constant is consistently larger than the laboratory value by 1 to 2% on the basis of gravity measurements in Australian mines. This discrepancy may have strong implications for the physics of gravitation. To test whether similar results can be observed in a different geological environment, gravity measurements in a Michigan borehole have been examined. Although these results cannot be taken as conclusive, owing to the large uncertainties involved in mass determination on a geophysical scale, these measurements are generally consistent with those of the Australian experiment. 相似文献
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Montzka SA Krol M Dlugokencky E Hall B Jöckel P Lelieveld J 《Science (New York, N.Y.)》2011,331(6013):67-69
The oxidizing capacity of the global atmosphere is largely determined by hydroxyl (OH) radicals and is diagnosed by analyzing methyl chloroform (CH(3)CCl(3)) measurements. Previously, large year-to-year changes in global mean OH concentrations have been inferred from such measurements, suggesting that the atmospheric oxidizing capacity is sensitive to perturbations by widespread air pollution and natural influences. We show how the interannual variability in OH has been more precisely estimated from CH(3)CCl(3) measurements since 1998, when atmospheric gradients of CH(3)CCl(3) had diminished as a result of the Montreal Protocol. We infer a small interannual OH variability as a result, indicating that global OH is generally well buffered against perturbations. This small variability is consistent with measurements of methane and other trace gases oxidized primarily by OH, as well as global photochemical model calculations. 相似文献