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The spore germination and gametophyte development of 21 ferns are studied. It indicates that :① the development period of prothallium and young sporophyte of the same species is different due to seeding time of spores;② the optimal temperatures of spores germination and gametophyte development of 21 ferns are about 15 -24 ℃;③ the rate of spore germination of rare ferns is much lower than the ferns which occur large populations in nature;④ the treatment with GA 3 can accelerate the germination of the spores;⑤ the prothallium changes from large to small, green to yellow when young sporophyte comes out. The prothalliums of all 21 ferns die away after the appear of the 3rd leaf of sporophytes;⑥ shapes of the 1st and 2nd leaves of the young sporophyte are different from those emerged later;⑦ spores cultured in dark can not germinate;⑧ a prothallium can develop only one young sporophyte though it has many archegoniums, and the spore propagation with leaf mould substrate is an economical method.
摘 要:以腐叶土为培养基质,对 21 种蕨类植物进行了孢子萌发和原叶体发育的研究,结果表明:①不同时期播种的同种蕨类的孢子,发育出原叶体和幼孢子体所历经的时间长短不同;②孢子萌发和配子体生长发育的适宜温度约为 15 ~ 24 ℃;③稀有蕨类的孢子萌发率低,而在野外能形成较大种群的蕨类的孢子萌发率高;④用 GA 3 处理孢子可以促进萌发;⑤当原叶体上长出幼孢子体时,原叶体由大变小,由绿变黄, 21 种蕨类的原叶体都在幼孢子体上长出第 3 片叶时消失;⑥幼孢子体上长出的第 1 、 2 片叶在形态上与以后长出的叶不同;⑦孢子萌发需要光;⑧ 1 片原叶体尽管有多个颈卵器,但仅发育出 1 株幼孢子体;⑨利用腐叶土进行蕨类孢子繁殖是一种经济实用的繁殖方法。
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As a fundamental social organization, the sandglass configuration of nonprofit organization is different from the usual pyramid structure of business organization; also, the configuration and characteristic of human resources in nonprofit organization are different from those of enterprises.
其沙漏型组织结构与企业组织的金字塔结构有很大的差异,人力资源构成和特点上也有别于企业针对我国事业单位改革中的人力资源管理,分别从董事会、高层管理人员、普通工作人员和志愿者四个方面提出了改革的方向。
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Now the thermal comfort indexes commonly used are ASHRAE Standard 55-1992 and ISO7730, which are both based on young people in Europe and unsteady indoor environment. In fact, it is not quite fit for Chinese people in semitropics and in passive non-air-conditioned buildings, as China has different climate and custom from European and the indoor environment in passive non-air-conditoned building is unsteady, which is different from air-conditioned building, either.
现行通用的ASHRAE55-1992标准和ISO7730标准都是针对欧美国家青年人提出的,并多以稳定的空调室内环境作为分析基础,因此对于我国多样气候环境下的亚洲人群而言,该类标准在适用性上将会存在一些偏差,同时也不能对被动式太阳能建筑室内非稳态环境下的人体舒适性做出十分准确的预测。
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Since the background of Indian Sufism formation is different from that of Western Asia and Mid-Asia, the characteristics of Indian Sufism is different from that of the latter.
由于印度苏非派形成的历史背景不同于西亚中亚苏非派,所以它具有与西亚中亚苏非派不同的特点。
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Since Debussy was deeply influenced by "symbolist" literature and poets, the thesis makes a brief explanation on some representatives of "symbolist" literature from different angles, and puts forward some personal views of the author, including that Debussys techniques of expression he drew on the experience of poets and writers were different from one another.
鉴于德彪西所受"象征主义"文学和诗人的影响较为深刻,本文对"象征主义"文学的几位代表人物从不同角度进行了简要说明,并加入笔者个人的一些见解,提出德彪西从各位诗人和文学家那里借鉴的表现手法也是各不相同的。
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The successive stability constants which are obtained by non-linear least-squares methord fitting Bjerrum formula. In three- system ,the results from Scatchard plots indicate that there exists two strong binding site of Mn and one strong binding site of Zn,there are same results compareing with two -system ,but some more weak binding sites are different from the different addition sequence ,show that there are not common strong binding site of Mn,Zn in HSA or BSA .Strong binding sites have electiveness and unfalteringness ,weak binding sites exists irreversibility.
用非线性最小二乘法拟合Bjerrum方程,计算了同时竞争体系的逐级稳定常数;Scatchard图分析表明,三元体系中,Mn和Zn与血清白蛋白结强合部位数分别为2和1,与二元体系相比,保持不变,弱结合部位数随加入顺序的不同而不同,但都有所增加,竞争结果说明了Mn和Zn与血清白蛋白结合没有共同的强结合部位,强结合部位具有专一性,选择性,而弱结合部位具有不可逆性。
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These characters is not only different from the normal measurement and calculation method but also different from characteristic in indeformable and porous media.
而毛细凝聚、毛细管力、界面吸附对凝析油气相平衡过程的影响也会随平均孔隙半径、比面和总表面积的动态变化而变化。
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In the end ,it comes to the conclusion that the phase behavior of gas condensate considering effect of reservoir deformation,capillary force,capillary condensation and interfacial adsorption is not only notably different from phase behavior in PVT cell but also remarkably different from phase behavior in indeformable and porous media. therefore,it is
最后得出结论,储层变形、界面吸附、毛细凝聚、毛细管力对凝析气藏油气体系相态特征有重要的影响,其相态特征显著不同于常规不考虑介质影响时的情形,也显著不同于前人研究的无变形多孔介质中的相态特征;因而建议在工程应用中,考虑介质变形和界面现象对凝析油气体系相态特征的影响。
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The New Rice Variety Liaoxing 1,with high eurytopicity has higher photosynthesis rate,higher stoma conductance,higher SPAD,higher ingather quotiety than other largely planted varieties in Liaoning Province,when planted in the rice area from 39°N to 43°N.Different from other varieties,when planted in four spots in different latitudes,the yield components of Liaoxing 1 change little and so it keeps higher yield level.
水稻新品种辽星1号具有很强的广适性,从北纬39°到北纬43°布点试验,用L6400光效测定仪测定辽星1号及其对照品种的光合速率、气孔导度、叶绿素含量、经济系数等指标,在4个不同纬度,辽星1号的各项指标均显著地高于辽宁其它主栽品种;产量结构没有发生很大变化,产量始终表现出较高水平。
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Studies show that the average ratio of w/w(P2O5)(1.62) of phosphates in submarine guyots is the same as that of w/w(P2O5)(1.621)of carbonate-fluorapatite, but is obviously different from that of w/w(P2O5)(1.318)of fluorine_carbonate, suggesting that the phosphates from northwestern Pacific are species of carbonate_fluorapatite.Three types of microneedle-microcolumnar, microgranular and microcryptocrystalline carbonate_fluorapatite with different abundances have been found.
海山磷酸盐的平均化学成分w/w(P2O5)(1.62)与碳氟磷灰石的w/w(P2O5)(1.621)几乎一致,而与氟磷灰石的w/w(P2O5)(1.318)相差甚远,表明海山磷酸盐为碳氟磷灰石,其形态主要有针状_柱状微晶碳氟磷灰石、粒状微晶碳氟磷灰石及显微隐晶质碳氟磷灰石3种类型,它们在分布丰度上存在差异。
- 推荐网络例句
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The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.
此刻阴唇已经几乎完全的缝在一起了,排除多余淤血体液的管子和Foley导管从顶端冒出来。
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To get the business done, I suggest we split the difference in price.
为了做成这笔生意,我建议我们在价格上大家各让一半。
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After an hour and no pup, look for continued contractions and arching of the back with no pup as a sign of trouble.
一个小时后,并没有任何的PUP ,寻找继续收缩和拱的背面没有任何的PUP作为一个注册的麻烦。