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Lumber01:19

Lumber

165
Lumber is derived from logs which are harvested, debarked, and processed into long pieces with a rectangular cross-section. The transformation of logs into lumber involves multiple steps, beginning with an automated saw that slices the log into slabs. These slabs are then transported via a conveyor belt to smaller saws, where they are cut into square-edged pieces of specific widths.
Initially, the surfaces of these lumber pieces are rough, and their dimensions may vary slightly from one end to...
165
Lateralization01:28

Lateralization

393
Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.
393
Lenz's Law01:15

Lenz's Law

4.2K
The direction in which the induced emf drives the current around a wire loop can be found through the negative sign. However, it is usually easier to determine this direction with Lenz's law, named in honor of its discoverer, Heinrich Lenz (1804–1865). Lenz's law states that the direction of the induced emf drives the current around a wire loop always to oppose the change in magnetic flux that causes the emf.
If a bar magnet is moved toward a coil such that the magnetic flux...
4.2K
Laminins are the Adhesive Proteins of Basal Lamina00:55

Laminins are the Adhesive Proteins of Basal Lamina

2.2K
Laminins are heterotrimeric proteins with high molecular mass found in the extracellular matrix. Each laminin molecule is composed of three chains, viz. alpha, beta, and gamma, coded by five, four, and three paralogous genes, respectively. Laminins are categories based on the compositions of the three chains.
In humans, the five forms of alpha chains are LAMA 1, LAMA 2, LAMA 3, LAMA 4, and LAMA 5. The four forms of beta chains are LAMB 1, LAMB 2, LAMB 3, and LAMB 4. The three forms of gamma...
2.2K
Lift01:23

Lift

218
Lift is a fundamental aerodynamic force that acts perpendicular to the direction of airflow. It plays a central role in achieving and sustaining flight and in stabilizing various vehicles. Lift primarily originates from pressure differences created across surfaces, such as an airfoil. A lower pressure region forms above the wing, while a higher pressure region forms below it, generating an upward force. This differential results from the shape and orientation of the airfoil, enabling the wing...
218
Larynx01:21

Larynx

1.9K
The human larynx, often referred to as the voice box, is an intricate organ located in the neck. It serves as a pathway for air to enter the lungs during respiration and is an essential component of voice production.
Anatomy of the Larynx
The larynx consists of various components, including cartilage, muscles, and vocal cords. Its structure includes three large unpaired cartilages—the thyroid, cricoid, and epiglottis—and three smaller paired cartilages—the arytenoids,...
1.9K

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Updated: Aug 21, 2025

Author Spotlight: Advancing Pelvic Prolapse Treatment with a Non-Mesh Approach using Laparoscopic Pectopexy
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在卢拉获胜后,

Sofia Moutinho1

  • 1Sofia Moutinho is a science journalist in Rio de Janeiro.

Science (New York, N.Y.)
|November 15, 2022
PubMed
概括
此摘要是机器生成的。

巴西的科学界在很大程度上反对前总统Jair Bolsonaro. 他的继任者现在在科学和研究政策方面面临重大障碍.

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科学领域:

  • 政治科学
  • 科学政策
  • 巴西研究

背景情况:

  • 尔·博尔索纳罗的总统任期 (2019-2022) 经历了严重的政治两极分化和影响巴西科学研究和资金的政策.
  • 由于对学术自由和研究完整性的威胁, 巴西科学界的一大部分人强烈反对博尔索纳罗政府.

研究的目的:

  • 在博尔索纳罗执政期间和之后,
  • 确定巴西科学界及其新领导层面临的关键挑战.

主要方法:

  • 关于巴西科学政策的政治话语和媒体报道的定性分析.
  • 审查科学界对政府行动的公开声明和机构反应.

主要成果:

  • 广泛的科学界对博尔索纳罗的政策和言论表示不满.
  • 确定关键问题,包括预算削减,国际合作减少以及研究机构的政治干预.

结论:

  • 过渡到一个新的总统政府为巴西的科学政策提供了机会.
  • 应对这些挑战需要共同努力,恢复信任,增加资金,加强科学界的自主权.