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新疆快步麻蜥的鳞片变异与亚种分化 被引量:5
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作者 汪洋 周鹿 时磊 《四川动物》 CSCD 北大核心 2014年第1期13-18,共6页
对采自新疆境内的塔城地区、伊犁地区、准噶尔盆地、乌鲁木齐市和吐鲁番盆地的快步麻蜥5个地理种群共287号标本进行观测,分析其鳞片变异式样,并在此基础上探讨亚种分化。根据变异率将鳞片分为三类:1)没有变异,如腹部横列鳞数;2)变异率在... 对采自新疆境内的塔城地区、伊犁地区、准噶尔盆地、乌鲁木齐市和吐鲁番盆地的快步麻蜥5个地理种群共287号标本进行观测,分析其鳞片变异式样,并在此基础上探讨亚种分化。根据变异率将鳞片分为三类:1)没有变异,如腹部横列鳞数;2)变异率在30%以下,包括上下唇鳞、颔片数等;3)变异率均超过30%,包括股孔数、股孔间鳞数、腹面横列鳞行数和颔片到领围鳞数等。对8个形态学量度指标及7个鳞片数量指标的差异系数进行统计分析,结果显示种群间的各指标均未达到亚种分化的差异显著性标准,暗示研究区域内的快步麻蜥在形态上没有亚种分化。结果表明快步麻蜥东方亚种的有效性有待进一步研究确定。 展开更多
关键词 快步麻蜥 鳞片变异 亚种
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Morphological Variability in Vipera palaestinae along an Environmental Gradient
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作者 Stanislav VOLYNCHIK 《Asian Herpetological Research》 SCIE 2012年第3期227-239,共13页
The effect of local habitat conditions on organisms, including environmentally-induced morphological changes, constitutes an important aspect of macroecology and evolution. The degree of geographic intraspecific varia... The effect of local habitat conditions on organisms, including environmentally-induced morphological changes, constitutes an important aspect of macroecology and evolution. The degree of geographic intraspecific variation in body dimensions, corporeal ratios and scalation pattern among male and female Palestine vipers(Vipera palaestinae) in Israel were examined. Univariate and multivariate analyses using 20 variable features relating to metric and meristic characters were applied in order to determine the existence of geographic variability in this species. Univariate analysis revealed that the majority of morphological characters possess relatively minor interregional distinctions, with only a few traits demonstrating significant differences. Discriminant analysis of mixed-gender samples using a combination of variables did not distinguish between geographic groups within each sex. The multifactor approach slightly differentiated between samples when sexes were compared separately, but with much overlap. The continuous sampling method revealed no statistically significant relationship between geographic and metric variables across the distribution range. A weak latitudinal cline was observed in snout-vent length, with both sexes being larger in the south. Noticeable temperature-correlated intraspecific variability was found in both body and tail scale counts but not in head scalation features. Generally, both males and females demonstrate the same phenotype-environment correlation. The spatial variations in external morphology suggest that temperature conditions during early ontogenesis may induce quantitative changes in the scalation pattern of V. palaestinae. 展开更多
关键词 Vipera palaestinae geographic variability scalation pattern temperature-dependent trends VIPERIDAE
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φ与A的分布及场线
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作者 孔繁庭 雷桂林 +1 位作者 陈秀武 金虎 《甘肃教育学院学报(自然科学版)》 2002年第3期56-59,共4页
分别推出了几种情况下 ,φ与A的分布 ,并给出了 φ与A的场线图 .
关键词 ψ A 分布 标量场 矢理场 场线 电动力学 等势面 电荷分布
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抗生素降阶梯治疗重症肺炎的临床效果及安全性 被引量:7
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作者 孙成东 方理超 居静华 《中国医药科学》 2021年第3期228-231,共4页
目的研究抗生素降阶梯治疗重症肺炎的临床效果及安全性。方法选取2016年1月至2020年1月苏州市相城人民医院收治的80例重症肺炎患者作为研究对象,随机将所有入选者分为对照组和观察组,每组各40例。对照组采用传统抗生素治疗,观察组采用... 目的研究抗生素降阶梯治疗重症肺炎的临床效果及安全性。方法选取2016年1月至2020年1月苏州市相城人民医院收治的80例重症肺炎患者作为研究对象,随机将所有入选者分为对照组和观察组,每组各40例。对照组采用传统抗生素治疗,观察组采用抗生素降阶梯治疗,比较分析两组的临床疗效、机械通气时间、抗生素使用时间、感染控制时间、肺部湿啰音消失时间、咳嗽时间、住院时间、治疗前后炎症因子水平及治疗安全性。结果观察组临床治疗总有效率为95.0%,明显高于对照组的77.5%,差异有统计学意义(P<0.05)。观察组患者机械通气、抗生素使用、感染控制、肺部湿啰音消失、咳嗽、住院时间明显短于对照组,差异有统计学意义(P<0.05)。在CRP、PCT水平方面,治疗后观察组患者的各炎症因子水平明显低于对照组,差异有统计学意义(P<0.05)。观察组患者不良反应总发生率为5.0%,对照组患者不良反应总发生率为7.5%,两组比较差异无统计学意义(P>0.05)。结论抗生素降阶梯治疗方法在治疗重症肺炎方面效果较为理想,有助于临床症状的早期缓解,减轻机体炎症反应,缩短患者住院时间,且安全性相对较高,值得临床推广。 展开更多
关键词 重症肺炎 抗生素降阶梯治疗 安全性
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TRANSVERSE MODES IN PHASE-CONJUGATION RESONATORS (PCR) WITH FINITE APERTURES (Ⅱ)——FUNDAMENTAL PROPERTIES OF THE TRANSVERSE MODES IN PCR
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作者 李先枢 徐家进 高燕球 《Science China Mathematics》 SCIE 1990年第9期1141-1152,共12页
Based on the first part of this paper (Science in China, 33(1990), 982—995), further research has been done on quasi-equivalence relation and asymmetrical character of axisymmetrical phase-conjugatlon resonator(PCR).... Based on the first part of this paper (Science in China, 33(1990), 982—995), further research has been done on quasi-equivalence relation and asymmetrical character of axisymmetrical phase-conjugatlon resonator(PCR). A series of calculations for axisymmetrical PCR(hundreds of transverse modes in 66 axisymmetrical PCRs) have been carried out, and the results are compared with those of corresponding conventional laser resonators. Fundamental properties of the transverse modes (TEMs) in PCR are summarized. This makes possible a rough estimation of the properties of various TEMs in these simple PCR, including different geometrical structures. 展开更多
关键词 PHASE-CONJUGATION resonator TRANSVERSE mode quasi-equivalence relation matrix theory on propagation of a scalat light wave.
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