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関連する概念動画

Aging01:26

Aging

801
Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
801
The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

3.6K
Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
3.6K
Changes in the Appendicular Skeleton with Age01:09

Changes in the Appendicular Skeleton with Age

3.6K
The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
3.6K
Pharmacodynamics in Geriatric Patients: Effects of Age01:27

Pharmacodynamics in Geriatric Patients: Effects of Age

241
Age-related pharmacokinetic changes are extensively documented, but understanding age-related pharmacodynamic alterations is relatively limited. This knowledge gap can be partly attributed to the complexity of developing appropriate measures of drug responses compared to bioanalytical methods for determining drug concentrations.Most information regarding age-related differences in human pharmacodynamics originates from cross-sectional studies. However, these studies assume that observed mean...
241
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption01:22

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption

713
As individuals age, their body's physiology evolves, affecting drug pharmacokinetics. The most apparent changes occur in the gastrointestinal tract, where an increase in gastric pH, a delay in gastric emptying, and a reduction in gastrointestinal motility are observed. Remarkably, these changes do not substantially modify the absorption of orally administered drugs, particularly those absorbed via passive diffusion.Transdermal drug delivery emerges as a highly viable method for older adults due...
713
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution01:00

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution

265
Drug distribution in the human body is influenced by several factors, including plasma protein concentration, body composition, blood flow, tissue-protein concentration, and tissue fluid pH. Among these, changes in plasma protein concentration and body composition due to aging significantly affect how drugs are distributed within the body. Specifically, aging is associated with a decrease in albumin levels by about 10% and an increase in α1-acid glycoprotein levels. These alterations are...
265

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関連する実験動画

Updated: Feb 13, 2026

Discovery of Driver Genes in Colorectal HT29-derived Cancer Stem-Like Tumorspheres
06:52

Discovery of Driver Genes in Colorectal HT29-derived Cancer Stem-Like Tumorspheres

Published on: July 22, 2020

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老齢のドライバーのターンアップとダウンアップ

Marie Hardt, Guillermo Basulto-Elias, Heike Hofmann

    medRxiv : the preprint server for health sciences
    |February 12, 2026
    PubMed
    まとめ

    認知機能低下の高齢者は,運転中に左折を避けるかもしれません. 車両内のセンサーによって検出されるこの運転行動は,早期の認知障害をシグナルし,独立性を維持するのに役立ちます.

    科学分野:

    • ゲロントロジーはゲロントロジーの学科です.
    • 神経科学は神経科学である.
    • 輸送の安全性 輸送の安全性

    背景:

    • 高齢者の認知機能低下は,運転能力に影響を与える可能性があります.
    • 左折を避けるような自己規制戦略は起こりうるが,報告されていないことが多い.
    • 自然主義的なドライビングデータは,現実世界のドライビング行動の洞察を提供します.

    研究 の 目的:

    • 高齢のドライバーの認知状態の変化と左折頻度との関連を調査する.
    • 左折を避ける行為が認知機能低下の行動指標であるかどうかを判断する.

    主な方法:

    • 106人の高齢者は,神経心理学的テストを使用して,ベースラインと1年間のフォローアップで評価されました.
    • 車両内のセンサーは,12週間にわたって運転行動を被動的に記録しました.
    • 混合効果のロジスティック回帰では,認知状態の変化と左に曲がる頻度との関係を分析した.

    主要な成果:

    • 合計295,112のターンが分析されました.
    • フォローアップ時のより大きな認知障害は,左に曲がる確率の減少と有意に関連していました (OR = 0.984,P = .037).
    • これは,左折を避けることは,認知機能低下のマーカーである可能性があることを示唆しています.

    さらに関連する動画

    Methods to Study Changes in Inherent Protein Aggregation with Age in Caenorhabditis elegans
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    Methods to Study Changes in Inherent Protein Aggregation with Age in Caenorhabditis elegans

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    Continuous High-resolution Microscopic Observation of Replicative Aging in Budding Yeast
    10:41

    Continuous High-resolution Microscopic Observation of Replicative Aging in Budding Yeast

    Published on: August 20, 2013

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    関連する実験動画

    Last Updated: Feb 13, 2026

    Discovery of Driver Genes in Colorectal HT29-derived Cancer Stem-Like Tumorspheres
    06:52

    Discovery of Driver Genes in Colorectal HT29-derived Cancer Stem-Like Tumorspheres

    Published on: July 22, 2020

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    Methods to Study Changes in Inherent Protein Aggregation with Age in Caenorhabditis elegans
    11:57

    Methods to Study Changes in Inherent Protein Aggregation with Age in Caenorhabditis elegans

    Published on: November 26, 2017

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    Continuous High-resolution Microscopic Observation of Replicative Aging in Budding Yeast
    10:41

    Continuous High-resolution Microscopic Observation of Replicative Aging in Budding Yeast

    Published on: August 20, 2013

    13.3K

    結論:

    • 高齢のドライバーの左折回避は,認知機能低下の初期の行動的兆候として機能する可能性があります.
    • パッシブ・ドライビング・データは,機能的な変化を潜在的に検出し,適切な介入を助けることができます.
    • 左に曲がる頻度の傾向をモニタリングするための臨床的値を確立するためにさらなる研究が必要である.