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O que são Membranas?
O que são Membranas?
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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…
Fluidez de Membrana
Fluidez de Membrana
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Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules…
O Modelo de Mosaico Fluido
O Modelo de Mosaico Fluido
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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…
O que é um Gradiente Eletroquímico?
O que é um Gradiente Eletroquímico?
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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…
Difusão
Difusão
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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances,…
Osmose
Osmose
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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…
Tonicidade em Animais
Tonicidade em Animais
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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…
Tonicidade em Plantas
Tonicidade em Plantas
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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…
Associações Proteicas
Associações Proteicas
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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…
Transporte Facilitado
Transporte Facilitado
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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…
Transporte Ativo Primário
Transporte Ativo Primário
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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…
Transporte Ativo Secundário
Transporte Ativo Secundário
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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…
Endocitose Mediada por Receptores
Endocitose Mediada por Receptores
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Receptor-mediated endocytosis is a process through which bulk amounts of specific molecules can be imported into a cell after binding to cell…
Pinocitose
Pinocitose
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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…
Fagocitose
Fagocitose
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Cells pull particles inward and engulf them in spherical vesicles in an energy-requiring process called endocytosis. Phagocytosis (“cellular…
Exocitose
Exocitose
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Exocytosis is used to release material from cells. Like other bulk transport mechanisms, exocytosis requires energy. While endocytosis takes…
Difusão molecular em membranas plasmáticas de linfócitos primários medida por fluorescência Correlation Spectroscopy
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…
Exame do Synaptic Vesicle Reciclagem Usando FM Corantes Durante Evocado, espontânea, e as atividades de Synaptic miniatura
Synaptic vesicles in functional nerve terminals undergo exocytosis and endocytosis. This synaptic vesicle recycling can be effectively analyzed using…

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