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O que são as Células?
Cells are the smallest and basic units of life, whether it is a single cell that forms the entire organism, e.g., in a bacterium or trillions of…
Tamanho Celular
The size of cells varies widely among and within organisms. For instance, the smallest bacteria are 0.1 micrometers (μm) in diameter—about a…
Compartimentalização Eucariótica
One of the distinguishing features of eukaryotic cells is that they contain membrane-bound organelles, such as the nucleus and mitochondria, that…
Células Procarióticas
Prokaryotes are small unicellular organisms that include the domains—Archaea and Bacteria. Bacteria include many common organisms, such as…
Citoplasma
The cytoplasm consists of organelles, an aqueous solution called the cytosol, and a framework of protein scaffolds called the cytoskeleton. The…
O Núcleo
The nucleus is a membrane-bound organelle that contains a eukaryotic organism’s genetic instructions in the form of chromosomal DNA. This is…
Retículo Endoplásmico
The Endoplasmic Reticulum (ER) in eukaryotic cells is a substantial network of interconnected membranes with diverse functions, from calcium storage…
Ribossomas
Ribosomes translate genetic information encoded by messenger RNA (mRNA) into proteins. Both prokaryotic and eukaryotic cells have ribosomes. Cells…
Aparelho de Golgi
As they leave the Endoplasmic Reticulum (ER), properly folded and assembled proteins are selectively packaged into vesicles. These vesicles are…
Microtúbulos
There are three types of cytoskeletal structures in eukaryotic cells—microfilaments, intermediate filaments, and microtubules. With a diameter…
Mitocôndria
Mitochondria and peroxisomes are organelles that are the primary sites of oxygen usage in eukaryotic cells. Mitochondria carry out cellular…
Junções Comunicantes
Multicellular organisms employ a variety of ways for cells to communicate with each other. Gap junctions are specialized proteins that form pores…
A Matriz Extracelular
In order to maintain tissue organization, many animal cells are surrounded by structural molecules that make up the extracellular matrix (ECM).…
Tecidos
Cells with similar structure and function are grouped into tissues. A group of tissues with a specialized function is called an organ. There are four…
Parede Celular da Planta
The plant cell wall gives plant cells shape, support, and protection. As a cell matures, its cell wall specializes according to the cell type. For…
Plasmodesmos
The organs in a multicellular organism’s body are made up of tissues formed by cells. To work together cohesively, cells must communicate. One…
A partir de construções de Cristais - Rumo a determinação da estrutura de β-barril exterior Proteínas de Membrana
Membrane proteins serve important functions in cells such as nutrient transport, motility, signaling, survival and virulence, yet constitute only ~1%…
Estudos de estrutura-função em células estaminais embrionárias Rato Usando recombinase mediada por troca cassete
Gene engineering in mouse embryos or embryonic stem cells (mESCs) allows for the study of the function of a given protein. Proteins are the…
Isolamento de exossomas a partir do plasma do HIV-1 indivíduos positivos
Exosomes are small vesicles ranging in size from 30 nm to 100 nm that are released both constitutively and upon stimulation from a variety of cell…

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