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相关概念视频

Isomerism02:43

Isomerism

18.6K
Isomers are molecules with the same molecular formula but different structural arrangements. Isomers can be further classified into constitutional isomers and stereoisomers. Constitutional isomers differ in the connectivity of their constituent atoms. For example, 2-butanol and diethyl ether are constitutional isomers, as they have the same chemical formula, C4H10O, but differ in the connectivity of the carbon and oxygen atoms. Constitutional isomers have different physical and chemical...
18.6K
Isotopes and Radioisotopes01:28

Isotopes and Radioisotopes

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In the early 1900s, English chemist Frederick Soddy realized that an element could have atoms with different masses that were chemically indistinguishable. These different types are called isotopes — atoms of the same element that differ in mass. Isotopes differ in mass because they have different numbers of neutrons but are chemically identical because they have the same number of protons. Soddy was awarded the Nobel Prize in Chemistry in 1921 for this discovery.
An isotope containing...
8.7K
Isotopes01:12

Isotopes

57.0K
Elements have a set number of protons that determines their atomic number (Z). For example, all atoms with eight protons are oxygen; however, the number of neutrons can vary for atoms of the same element. The sum of the number of protons and the number of neutrons is the mass number (A). Atoms with the same atomic number but different mass numbers are called isotopes. Elements can have multiple isotopes, for example, carbon-12, carbon-13, and carbon-14.
An element's atomic mass, or weight,...
57.0K
Isomerism in Alkenes02:01

Isomerism in Alkenes

12.1K
Alkenes like 1-butene and 2-butene exhibit constitutional isomerism, as they differ in the position of the double bond. Further, 2-butene exhibits stereoisomerism and exists as two distinct compounds differing in spatial arrangement.
An isomer is called cis-2-butene when the methyl groups are on the same side of the double bond, and the other stereoisomer, in which methyl groups are on the opposite side of the double bond, is called trans-2-butene. The cis and trans stereoisomers are not...
12.1K
Weir01:24

Weir

82
A weir is a hydraulic structure designed to partially obstruct an open channel, enabling precise control and measurement of water flow. By forcing water to flow over or through it, a weir allows for accurate determination of discharge rates, making it an essential tool in water resource management. These structures are extensively used in regulating river flows, irrigation systems, and flood control channels.Types of Weirs and Their FeaturesWeirs are categorized primarily into sharp-crested and...
82
Insomnia01:27

Insomnia

111
Insomnia is a prevalent sleep disorder characterized by difficulty falling asleep, frequent awakenings during the night, and waking up too early without being able to return to sleep. People with insomnia often experience these disruptions at least three nights a week for at least one month. Chronic insomnia, which lasts for at least three months, can lead to increased anxiety, which in turn can worsen sleep difficulties, creating a cycle of sleeplessness and stress.
Multiple factors contribute...
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<i>Fusarium</i> Species Associated with Preharvest Maize Ear Rot Cause Stalk Rot Disease in Ethiopia.

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相关实验视频

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A Multi-Parametric Islet Perifusion System within a Microfluidic Perifusion Device
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A Multi-Parametric Islet Perifusion System within a Microfluidic Perifusion Device

Published on: January 26, 2010

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是的,这是的,这是的,这是的.

Jane Marian Luis1, Hillary L Mehl1,2, Dianne Plewa3

  • 1Tidewater Agricultural Research and Extension Center, Virginia Tech, Suffolk, VA 23437.

Phytopathology
|June 9, 2023
PubMed
概括
此摘要是机器生成的。

这项研究研究了与玉米焦油斑鱼眼病变相关的真菌. 大多数分离物被确定为Fusarium物种,这表明以前的Microdochium maydis.dis的错误识别.

关键词:
这里是 Fusariumarium .单体图片 (Monographella) 是一个单体图片玉米玉米玉米玉米玉米鱼眼病变的病变 鱼眼病变的病变

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科学领域:

  • 植物病理学 植物病理学
  • 菌类学 菌类学是指菌类学.
  • 农业科学 农业科学

背景情况:

  • 由Phyllachora maydis引起的焦油斑是一种新兴的玉米疾病.
  • 被称为"鱼眼"的死角病变围绕着P. maydis stromata.
  • 这些病变以前被归因于Microdochium maydis,最近的文档有限.

研究的目的:

  • 为了识别与围绕P. maydis.周围的鱼眼病变相关的Microdochium类真菌.
  • 为了澄清玉米焦油斑疾病中鱼眼症状的致病因子.

主要方法:

  • 从墨西哥,伊利诺伊州和威斯康星州收集了带有鱼眼病变的玉米叶样本.
  • 从病变中分离和培养的真菌,包括被认为是墨西哥M. maydis的分离物.
  • 使用多基因遗传学分析 (ITS,TEF1-α,RPB1,RPB2) 进行隔离物鉴定.

主要成果:

  • 获得了101种微多奇/类分离物;91%的分离物被确定为类. 通过ITS测序.通过ITS测序.
  • 遗传学分析证实了所有分离物聚集在Fusarium系内,与Microdochium不同.
  • 来自墨西哥的Fusarium分离物属于F. incarnatum-equiseti复合物;美国的分离物主要属于F. sambucinum复合物.

结论:

  • 造成鱼眼病变的真菌主要是Fusarium物种,而不是Microdochium maydis.
  • 之前关于M.maydis与这些病变相关的报道可能是由于错误识别造成的.
  • 这项研究澄清了玉米焦油斑中鱼眼症状的真菌病因.