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פרק 5
מהם קרומים?
מהם קרומים?
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A key characteristic of life is the ability to separate the external environment from the internal space. To do this, cells have evolved…
נזילות הקרום
נזילות הקרום
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Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules…
מודל הפסיפס הנזיל
מודל הפסיפס הנזיל
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The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of…
מהו הפרש אלקטרוכימי?
מהו הפרש אלקטרוכימי?
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Adenosine triphosphate, or ATP, is considered the primary energy source in cells. However, energy can also be stored in the electrochemical gradient…
דיפוזיה
דיפוזיה
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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances,…
אוסמוזה
אוסמוזה
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Approximately 60% to 95% of the weight of living organisms is attributed to water. Therefore, maintaining appropriate water balance within cells is…
מתח בחיות
מתח בחיות
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The tonicity of a solution determines if a cell gains or loses water in that solution. The tonicity depends on the permeability of the cell membrane…
מתח בצמחים
מתח בצמחים
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Tonicity describes the capacity of a cell to lose or gain water. It depends on the quantity of solute that does not penetrate the membrane. Tonicity…
קישורי חלבון
קישורי חלבון
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The cell membrane—or plasma membrane—is an ever-changing landscape. It is described as a fluid mosaic as various macromolecules are embedded in…
תובלה בעלת סיוע
תובלה בעלת סיוע
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The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and…
תובלה פעילה ראשונית
תובלה פעילה ראשונית
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In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or…
תובלה פעילה שניונית
תובלה פעילה שניונית
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One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this…
אנדוציטוזיס מתווך על ידי קולטנים
Receptor-mediated endocytosis is a process through which bulk amounts of specific molecules can be imported into a cell after binding to cell…
פינוציטוזה
פינוציטוזה
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Cells use energy-requiring bulk transport mechanisms to transfer large particles, or large amounts of small particles, into or out of the cell. The…
פגוציטוזיס
פגוציטוזיס
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Cells pull particles inward and engulf them in spherical vesicles in an energy-requiring process called endocytosis. Phagocytosis (“cellular…
אקסוציטוזיס
אקסוציטוזיס
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Exocytosis is used to release material from cells. Like other bulk transport mechanisms, exocytosis requires energy. While endocytosis takes…
דיפוזיה מולקולרית פלזמה ממברנות יסודי לימפוציטים נמדד באמצעות מתאם ספקטרוסקופיה פלואורסצנטי
Fluorescence correlation spectroscopy (FCS) is a powerful technique for studying the diffusion of molecules within biological membranes with high…
The Cell-based L-Glutathione Protection Assays to Study Endocytosis and Recycling of Plasma Membrane Proteins
Membrane trafficking involves transport of proteins from the plasma membrane to the cell interior (i.e. endocytosis) followed by trafficking to…
בחינה של Synaptic שלפוחיות מחזור באמצעות צבעי FM במהלך עורר, ספונטני, ופעילויות Synaptic מיניאטורות
Synaptic vesicles in functional nerve terminals undergo exocytosis and endocytosis. This synaptic vesicle recycling can be effectively analyzed using…

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