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本文利用不同的给桑量分别饲养四、五龄蚕,其结果表明:不同的龄期,给桑量对蚕茧的产量和质量的影响是不一致的.四龄期是影响和决定质量的主要时期,五龄是高产的最重要的环节. 相似文献
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W.?P.?WaserEmail author A.?Schmitz S.?F.?Perry A.?Wobschall 《Fish physiology and biochemistry》2005,31(1):73-82
The teleost pseudobranch, a reduced mandibular gill arch, morphologically closely resembles a gill hemibranch. It consists
of several filaments bearing numerous lamellae. The vascular system of the pseudobranch also matches that of a gill, with
afferent and efferent filamental arteries and the lamellar blood space. Despite the pseudobranch’s gill-like appearance, however,
a gas exchange function is excluded in many teleosts by overlying opercular epithelium, effectively eliminating diffusional
exchange with the external medium. The physiological function of the pseudobranch is still unknown, though its conspicuously
close association with the ocular choroid rete mirabile, a structure supporting elevated oxygen partial pressures in the eye, suggests a role related to the process of oxygen secretion
into the eyes of teleosts. In this paper we present new stereological data on the pseudobranch of rainbow trout (average weight:
478 ± 114 g, x ± SD, n = 12). The total Cavalieri volume of the pseudobranch was 46.4 μl (97 μl kg−1), consisting of lamellae 49%, connective tissue 43.8%, large blood vessels 4.5%, filamental cartilage 2.3%, and central venous
sinus 1.3%. Lamellae were comprised of pillar and pseudobranchial cells 81%, blood space 12.3%, and lacunar tissue 6.4%. The
inner surface of the blood space in the lamellae was 12.2 cm2 (25.5 cm2 kg−1), and its volume was 2.81 μl (5.88 μl kg−1). The results demonstrate the pseudobranch’s potential for physiological functions requiring a high surface area or surface-to-volume
ratio, i.e. ion transfer, gas exchange and other regulatory processes. More detailed analysis of the function of the pseudobranch,
however, has to remain subject of future morphological and physiological studies. 相似文献
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蚕茧价格变化规律及管理对策 总被引:10,自引:2,他引:8
对1992年以来我国蚕茧价格和蚕茧供求变化进行分析,研究蚕茧价格的波动规律以及蚕茧均衡价格产生的条件,提出蚕茧价格管理的构想与建议。 相似文献
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Objective
To evaluate the transdermal local anaesthetic effect of lidocaine or lidocaine combined with prilocaine or tetracaine in horses.Study design
Experimental, randomized study.Animals
A total of five healthy adult warmblood horses.Methods
Horses were clipped bilaterally at the withers, cranial saddle area and caudal saddle area. Baseline measurements for mechanical superficial sensation via von Frey filaments and nociceptive thermal thresholds were performed. A 5% lidocaine patch (12 hour exposure, treatment L), a lidocaine/prilocaine cream (each 2.5%, treatment LP) and a lidocaine/tetracaine cream (each 7%, treatment LT) were applied (both 2 hour exposure). The same product was applied at the same location bilaterally, but on the right side an epidermal micro-perforation (dermaroller, 1200 needles) was performed prior to application. A total of five more measurements were performed at each location, immediately at the end of exposure time followed by hourly measurements. Thermal thresholds normalized to thermal excursion were analysed. One- or two-way anova and the Wilcoxon signed-rank test were used for statistical analysis with p < 0.05 considered significant.Results
Epidermal micro-perforation had no enhancing effect. Treatments L, LP, and LT resulted in increased thermal excursion (%) immediately (84.7 ± 12.9; 100.0 ± 0.0; 100.0 ± 0.0) and 1 hour (81.7 ± 66; 86.0 ± 17.7; 87.7 ± 14.4) after the removal of the respective product compared to baseline (66.1 ± 9.3; 69.9 ± 8.3; 76.5 ± 7.8). Superficial mechanical sensation was decreased by the lidocaine-and-tetracaine cream at all time points, and by the lidocaine patch and lidocaine-and-prilocaine cream for three measurements.Conclusions and clinical relevance
Eutectic mixtures of lidocaine with either prilocaine or tetracaine led to a reduction in thermal nociception and mechanical sensation for up to 2 hours. 相似文献8.
通过6种类型的蚕茧干燥温度对蛹体适干率、茧丝品质等的影响的综合调查,认为二冲突温干燥的蛹体适干率、茧丝品质优于恒温干燥,而以头冲温度适中(110℃),二冲变温(100℃→90℃)时的蛹体适干率和茧丝品质略优于其他类型。 相似文献
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家蚕幼虫后部丝腺是合成和分泌丝素蛋白的重要器官。为从蛋白质水平探究不同家蚕品系产丝量差异的原因,应用蛋白质组学研究方法,选取3个产丝量有较大差异的家蚕品系Ndx、大造和21-872为材料,通过双向电泳和基质辅助激光解析电离飞行时间质谱(MALDI-TOF-MS)技术对各品系5龄第5天幼虫后部丝腺表达的差异蛋白进行鉴定,查找与丝蛋白合成相关的蛋白质。结果表明,茧丝突变品系Ndx后部丝腺的蛋白质表达水平与普通丝量品系大造和高丝量品系21-872有差异,差异表达蛋白种类主要为应激反应相关蛋白、能量相关蛋白、蛋白质合成相关蛋白和一些酶类,其中核糖体磷酸化蛋白P0和P2、蛋白质二硫化物异构酶、丝素轻链蛋白Fib-L以及丝素蛋白P25等在Ndx后部丝腺的含量明显低于其它2个品系。推测在茧丝突变品系Ndx的后部丝腺中,上述蛋白质表达量的变化可能是导致其不能正常吐丝结茧的原因。 相似文献
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