関連する実験動画
Updated: Jul 9, 2026

13:39
Optical Trapping of Nanoparticles
Published on: January 15, 2013
まとめ
高濃度のカルシウムとイオノフォール (A23187) は,淡水シロウの毛の打たれを止めます. この発見は,内部カルシウムの増加が,これらの生物の状動脈停止を誘発するという理論を裏付けている.
科学分野:
- マリン・バイオロジー マリン・バイオロジー
- 細胞生理学 細胞生理学
- 無脊椎動物動物学
背景:
- シリアは水生生物の呼吸と栄養に不可欠です.
- 淡水のの横側シリアのメタクロナルリズムが,水の流れを促進する.
- カルシウムイオンは,運動性を含む様々な細胞プロセスのレギュレータとして知られています.
研究 の 目的:
- 淡水のの状機能におけるカルシウムの役割を調査する.
- 細胞内カルシウム濃度の上昇がシリアス停止を引き起こすかどうかを判断する.
主な方法:
- カルシウム塩化物とイオノフォアカルシウムの濃度が異なる孤立した魚の臓組織の perfusion A23187.
- 異なる化学条件下でのシリヤリービートパターンの観察.
- イオノフォア除去後のシリア活動回復の評価.
主要な成果:
- 6.25-12.5 mMのカルシウムと10(-5) M A23187の輸液により,横側毛が停止し,毛は正面に向かった.
- カルシウム単独,イオノフォール単独,または単価イオンのいずれも,シリアス停止を誘導しません.
- イオノフォアを取り除いた後,キリリア活動が再開し,回復率はカチオンによって異なる (KCl > CaCl2 > NaCl).
結論:
- 実験結果は,細胞内カルシウム濃度の局所的増加が,淡水のでシリアス停止の直接的な原因であるという仮説を強く支持しています.
- この研究は,双弁生物の状機能を調節する特定のカルシウム依存メカニズムを明らかにしています.
関連する概念動画
Receptor-mediated Endocytosis
Overview
Intracellular Movement of Viruses and Bacteria
Intracellular bacteria and viruses often comprise a group of highly infectious pathogens that can cause several diseases. Bacterial pathogens include those belonging to the genus Rickettsia responsible for conditions such as rocky mountain spotted fever and the Mediterranean spotted fever; Chlamydia, a genus responsible for a sexually transmitted disease; Coxiella burnetii, an agent responsible for Q fever. Viral pathogens include vaccinia—a poxvirus, and herpes simplex virus—a virus that...
Pinching-off of Coated Vesicles
Vesicle budding is orchestrated by distinct cytosolic proteins such as adaptor proteins, coat proteins, and GTPases. To initiate vesicle budding, membrane-bending proteins containing crescent-shaped BAR domains bind to the lipid heads in the bilayer and distort the membrane to form a protein-coated vesicle bud. Adaptors proteins such as AP2 for clathrin-coated vesicles can nucleate on the deformed membrane. Finally, coat proteins such as clathrin or COPI and COPII assemble into a coat forming...
Mechanism of Filopodia Formation
Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Mechanism of Lamellipodia Formation
Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
Atomic Nuclei: Nuclear Relaxation Processes
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis. This...

