Results 101 to 110 of about 34,334 (249)
Guangtongxin yanjiu, 2012 为了便于精确控制熔锥光纤的形状,基于理论与实验研究,首先建立了熔融拉锥过程中熔锥光纤的成形模型,分析了熔锥形成的基本原理,并分别对加热区域不变及线性变化两种情况下熔锥形状进行理论分析,确定了加热区域长度、拉锥距离与熔锥过渡区形状、锥腰长度及半径的关系,最后给出了一系列熔锥光纤的理论形状和实验得到的实际形状。实验结果表明,熔锥的实际测量值与理论值十分接近,相对误差<3.89%。
夏娟, 诸跃进
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野生动物学报, 2020 为了确定从酒泉市某养殖场北极狐（Alopex lagopus）肠道分离蛔虫的种类，本次研究通过形态学和分子生物学方法对分离的虫株进行鉴定。在对6条分离于北极狐小肠蛔虫进行形态学鉴定的基础上，应用PCR技术对分离株的线粒体cox1基因部分序列进行扩增、测序与分析。形态学鉴定结果表明6条蛔虫与弓首蛔虫形态学特征基本一致；测序结果显示，6个虫株cox1基因序列大小为418 bp，其序列同源性为994%—1000%，与GenBank收录的狮弓蛔虫分离株同源性最高，为994%—997 ...
张建明
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New Phytologist, Volume 250, Issue 2, Page 873-884, April 2026.Summary In tropical mountains, surviving temperature extremes demands finely tuned strategies. We investigated how populations of the bromeliad Pitcairnia flammea across a 2200 m elevational gradient balance genetic canalization and plasticity, and whether thermal strategies are coordinated between seeds and leaves.
Cleber J. N. Chaves +17 more
wiley +1 more source
New Phytologist, Volume 250, Issue 2, Page 812-821, April 2026.Summary Postharvest pathogens can infect fresh produce both before and after harvest, by direct or wound‐enhanced penetration, remaining quiescent until ripening. Biotrophic‐like postharvest pathogens persist beneath host cells and can remain in a state of quiescence.
Dov B. Prusky +4 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2008 目的通过建立大鼠骨髓间充质干细胞（MSCs）的体外分离培养方法,探讨大鼠MSCs表型特征以及多向分化潜能。方法利用密度梯度离心法结合贴壁培养法分离纯化SD大鼠骨髓MSCs,传代扩增,进行形态学观察,测定生长曲线。免疫细胞组织化学及流式细胞分析检测细胞表面分子的表达。定向诱导MSCs向脂肪细胞、成骨细胞及软骨细胞分化。结果原代分离的MSCs在接种后48 h贴壁,细胞形态为椭圆形,多角形及短梭形,12天时细胞呈长梭形并达到90%单层融合。经传代扩增,细胞进一步纯化,细胞形态为均一的长梭形并呈漩涡状排列 ...
王刚, 吕同德, 马静, 常雅萍
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New Phytologist, Volume 250, Issue 1, Page 530-546, April 2026.Summary To address a critical gap in understanding amino acid transport in legume–Rhizobium symbiosis, we investigated the role of symbiosis‐associated USUALLY MULTIPLE ACIDS MOVE IN AND OUT TRANSPORTERS (UMAMITs) in Medicago truncatula nodulation.
Courtney S. Winning +8 more
wiley +1 more source
General Formulae of MCF of Labor-Income Taxation [PDF]
, 2000 任意の税率の限界的上昇に伴う厚生損失の変化分を税収の増加額で割った値を，公共資金の限界費用(marginal cost of public funds :MCF)という。ここでは，労働所得税にかかるMCFを正確に導出し，その一般型を定義する。まず第1節では，労働所得にかかる限界税率の上昇がもたらすMCFを、Browning(1987)に基づき定式化する。第2節では， Snow-Warren (1996)のモデルにおいて労働所得税の限界税率の上昇が労働供給(余暇)を減ら(増や)し ...
Kamakari Kohji +3 more
core +1 more source
New Phytologist, Volume 250, Issue 2, Page 735-756, April 2026.Summary Duckweeds (Lemnaceae) have excellent potential for fundamental and applied research due to ease of cultivation, small size, and continuous fast clonal growth. However, their usage as model organisms and platforms for biotechnological applications is often limited by the lack of universal genetic manipulation methods necessary for transgene ...
Verónica Barragán‐Borrero +12 more
wiley +1 more source
A PLETHORA3/7 transcription factor shapes cucumber shoot architecture
New Phytologist, Volume 250, Issue 1, Page 230-245, April 2026.Summary PLETHORA transcription factors (PLTs) are master regulators of plant development. Loss of shoot meristematic PLTs leads to reduced phyllotactic regularity and robustness in Arabidopsis and increased inflorescence branching in tomato. Whether these factors have similar functions in other species is not known.
Merijn Kerstens +6 more
wiley +1 more source
Zhongshan Daxue xuebao. Yixue kexue ban, 2013 【目的】 分析畸形精子症患者行卵胞浆内单精子注射(ICSI)后的妊娠结局?【方法】 回顾性分析因男性因素行ICSI治疗的445个新鲜取卵周期,根据精子形态学分析结果将研究对象分为:精子形态正常组(A组,正常形态率≥4%,n = 296),非极度畸形精子症组(B组,正常形态率≥1%且 0.05)?在3组中,极度畸形精子症组有最高的优质胚胎率(67.6% ,405/599),种植率(32.1%,53/165)和临床妊娠率(46.7%,35/75)?【结论】 ICSI可用于畸形精子症的治疗 ...
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