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  • Articles  (68,462)
  • Springer Nature  (55,520)
  • Oxford University Press  (7,269)
  • Institute of Physics  (2,180)
  • Annual Reviews  (1,796)
  • Blackwell Publishing Ltd  (1,697)
  • American Geophysical Union
  • American Meteorological Society
  • Springer Science + Business Media
  • 2000-2004  (50,745)
  • 1950-1954  (17,717)
  • Medicine  (63,538)
  • Natural Sciences in General  (38,803)
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  • Articles  (68,462)
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  • 1
    Electronic Resource
    Electronic Resource
    SALMONELLA INTERACTIONS WITH HOST CELLS: Type III Secretion at Work (2001)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Cell and Developmental Biology 17 (2001), S. 53-86 
    Details
    ISSN: 1081-0706
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology , Medicine
    Notes: Abstract The bacterial pathogen Salmonella enterica has evolved a very sophisticated functional interface with its vertebrate hosts. At the center of this interface is a specialized organelle, the type III secretion system, that directs the translocation of bacterial proteins into the host cell. Salmonella spp. encode two such systems that deliver a remarkable array of bacterial proteins capable of modulating a variety of cellular functions, including actin cytoskeleton dynamics, nuclear responses, and endocytic trafficking. Many of these bacterial proteins operate by faithful mimicry of host proteins, in some cases representing the result of extensive molecular tinkering and convergent evolution. The coordinated action of these type III secreted proteins secures the replication and survival of the bacteria avoiding overt damage to the host. The study of this remarkable pathogen is not only illuminating general paradigms in microbial pathogenesis but is also providing valuable insight into host cell functions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.cellbio.17.1.53
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  • 2
    Electronic Resource
    Electronic Resource
    PATTERNING MECHANISMS CONTROLLING VERTEBRATE LIMB DEVELOPMENT (2001)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Cell and Developmental Biology 17 (2001), S. 87-132 
    Details
    ISSN: 1081-0706
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology , Medicine
    Notes: Abstract Vertebrate limb buds are embryonic structures for which much molecular and cellular data are known regarding the mechanisms that control pattern formation during development. Specialized regions of the developing limb bud, such as the zone of polarizing activity (ZPA), the apical ectodermal ridge (AER), and the non-ridge ectoderm, direct and coordinate the development of the limb bud along the anterior-posterior (AP), dorsal-ventral (DV), and proximal-distal (PD) axes, giving rise to a stereotyped pattern of elements well conserved among tetrapods. In recent years, specific gene functions have been shown to mediate the organizing and patterning activities of the ZPA, the AER, and the non-ridge ectoderm. The analysis of these gene functions has revealed the existence of complex interactions between signaling pathways operated by secreted factors of the HH, TGF-beta/BMP, WNT, and FGF superfamilies, which interact with many other genetic networks to control limb positioning, outgrowth, and patterning. The study of limb development has helped to establish paradigms for the analysis of pattern formation in many other embryonic structures and organs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.cellbio.17.1.87
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  • 3
    Electronic Resource
    Electronic Resource
    IDENTIFICATION OF SELF THROUGH TWO-DIMENSIONAL CHEMISTRY AND SYNAPSES (2001)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Cell and Developmental Biology 17 (2001), S. 133-157 
    Details
    ISSN: 1081-0706
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology , Medicine
    Notes: Abstract Cells in the immune and nervous systems communicate through informational synapses. The two-dimensional chemistry underlying the process of synapse formation is beginning to be explored using fluorescence imaging and mechanical techniques. Early analysis of two-dimensional kinetic rates (kon and koff) and equilibrium constants (Kd) provides a number of biological insights. First, there are two regimes for adhesion-one disordered with slow kon and the other self-ordered with 104-fold faster kon. Despite huge variation in two-dimensional kon, the two-dimensional koff is like koff in solution, and two-dimensional koff is more closely related to intrinsic properties of the interaction than the two-dimensional kon. Thus difference in koff can be used to set signaling thresholds. Early signaling complexes are compartmentalized to generate synergistic signaling domains. Immune antigen receptor components have a role in neural synapse editing. This suggests significant parallels in informational synapse formation based on common two-dimensional chemistry and signaling strategies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.cellbio.17.1.133
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  • 4
    Electronic Resource
    Electronic Resource
    POLARIZED CELL GROWTH IN HIGHER PLANTS (2001)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Cell and Developmental Biology 17 (2001), S. 159-187 
    Details
    ISSN: 1081-0706
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology , Medicine
    Notes: Abstract Pollen tubes and root hairs are highly elongated, cylindrically shaped cells whose polarized growth permits them to explore the environment for the benefit of the entire plant. Root hairs create an enormous surface area for the uptake of water and nutrients, whereas pollen tubes deliver the sperm cells to the ovule for fertilization. These cells grow exclusively at the apex and at prodigious rates (in excess of 200 nm/s for pollen tubes). Underlying this rapid growth are polarized ion gradients and fluxes, turnover of cytoskeletal elements (actin microfilaments), and exocytosis and endocytosis of membrane vesicles. Intracellular gradients of calcium and protons are spatially localized at the growing apex; inward fluxes of these ions are apically directed. These gradients and fluxes oscillate with the same frequency as the oscillations in growth rate but not with the same phase. Actin microfilaments, which together with myosin generate reverse fountain streaming, undergo rapid turnover in the apical domain, possibly being regulated by key actin-binding proteins, e.g., profilin, villin, and ADF/cofilin, in concert with the ion gradients. Exocytosis of vesicles at the apex, also dependent on the ion gradients, provides precursor material for the continuously expanding cell wall of the growing cell. Elucidation of the interactions and of the dynamics of these different components is providing unique insight into the mechanisms of polarized growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.cellbio.17.1.159
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  • 5
    Electronic Resource
    Electronic Resource
    BOUNDARIES IN DEVELOPMENT: Formation and Function (2001)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Cell and Developmental Biology 17 (2001), S. 189-214 
    Details
    ISSN: 1081-0706
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology , Medicine
    Notes: Abstract Developing organisms may contain billions of cells destined to differentiate in numerous different ways. One strategy organisms use to simplify the orchestration of development is the separation of cell populations into distinct functional units. Our expanding knowledge of boundary formation and function in different systems is beginning to reveal general principles of this process. Fields of cells are subdivided by the interpretation of morphogen gradients, and these subdivisions are then maintained and refined by local cell-cell interactions. Sharp and stable separation between cell populations requires special mechanisms to keep cells segregated, which in many cases appear to involve the regulation of cell affinity. Once cell populations become distinct, specialized cells are often induced along the borders between them. These boundary cells can then influence the patterning of surrounding cells, which can result in progressively finer subdivisions of a tissue. Much has been learned about the signaling pathways that establish boundaries, but a key challenge for the future remains to elucidate the cellular and molecular mechanisms that actually keep cell populations separated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.cellbio.17.1.189
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  • 6
    Electronic Resource
    Electronic Resource
    A CELL BIOLOGICAL PERSPECTIVE ON ALZHEIMER'S DISEASE (2002)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Cell and Developmental Biology 18 (2002), S. 25-51 
    Details
    ISSN: 1081-0706
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology , Medicine
    Notes: Abstract The amyloid precursor protein and the proteases cleaving this protein are important players in the pathogenesis of Alzheimer's disease via the generation of the amyloid peptide. Physiologically, the amyloid precursor protein is implied in axonal vesicular trafficking and the proteases are implicated in developmentally important signaling pathways, most significantly those involving regulated intramembrane proteolysis or RIP. We discuss the cell biology behind the amyloid and tangle hypothesis for Alzheimer's disease, drawing on the many links to the fields of cell biology and developmental biology that have been established in the recent years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.cellbio.18.020402.142302
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  • 7
    Electronic Resource
    Electronic Resource
    TYPE III PROTEIN SECRETION IN YERSINIA SPECIES (2002)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Cell and Developmental Biology 18 (2002), S. 107-133 
    Details
    ISSN: 1081-0706
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology , Medicine
    Notes: Abstract The type III mechanism of protein secretion is a pathogenic strategy shared by a number of gram-negative pathogens of plants and animals that has evolved in order to inject virulence proteins into the cytosol of target eukaryotic cells. The pathogens of the Yersinia genus represent a model system where much progress has been made in understanding this secretion pathway. Herein, we review what has been recently learned in yersiniae about the various environmental signals that induce type III secretion, how the synthesis of secretion substrates is regulated, and how such a diverse group of proteins is recognized as a substrate for secretion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.cellbio.18.012502.105912
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  • 8
    Electronic Resource
    Electronic Resource
    BREAK INS AND BREAK OUTS: Viral Interactions with the Cytoskeleton of Mammalian Cells (2002)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Cell and Developmental Biology 18 (2002), S. 135-161 
    Details
    ISSN: 1081-0706
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology , Medicine
    Notes: Abstract The host cytoskeleton plays important roles in the entry, replication, and egress of viruses. An assortment of viruses hijack cellular motor proteins to move on microtubules toward the cell interior during the entry process; others reverse this transport during egress to move assembling virus particles toward the plasma membrane. Polymerization of actin filaments is sometimes used to propel viruses from cell to cell, while many viruses induce the destruction of select cytoskeletal filaments apparently to effect efficient egress. Indeed, the tactics used by any given virus to achieve its infectious life cycle are certain to involve multiple cytoskeletal interactions. Understanding these interactions, and their orchestration during viral infections, is providing unexpected insights into basic virology, viral pathogenesis, and the biology of the cytoskeleton.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.cellbio.18.012502.105920
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  • 9
    Electronic Resource
    Electronic Resource
    CHROMOSOME-MICROTUBULE INTERACTIONS DURING MITOSIS (2002)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Cell and Developmental Biology 18 (2002), S. 193-219 
    Details
    ISSN: 1081-0706
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology , Medicine
    Notes: Abstract Spindle microtubules interact with mitotic chromosomes, binding to their kinetochores to generate forces that are important for accurate chromosome segregation. Motor enzymes localized both at kinetochores and spindle poles help to form the biologically significant attachments between spindle fibers and their cargo, but microtubule-associated proteins without motor activity contribute to these junctions in important ways. This review examines the molecules necessary for chromosome-microtubule interaction in a range of well-studied organisms, using biological diversity to identify the factors that are essential for organized chromosome movement. We conclude that microtubule dynamics and the proteins that control them are likely to be more important for mitosis than the current enthusiasm for motor enzymes would suggest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.cellbio.18.032002.132412
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  • 10
    Electronic Resource
    Electronic Resource
    THE CHLAMYDIAL INCLUSION: Escape from the Endocytic Pathway1 (2002)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Cell and Developmental Biology 18 (2002), S. 221-245 
    Details
    ISSN: 1081-0706
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology , Medicine
    Notes: Abstract Chlamydiae, bacterial obligate intracellular pathogens, are the etiologic agents of several human diseases. A large part of the chlamydial intracellular survival strategy involves the formation of a unique organelle called the inclusion that provides a protected site within which they replicate. The chlamydial inclusion is effectively isolated from endocytic pathways but is fusogenic with a subset of exocytic vesicles that deliver sphingomyelin from the Golgi apparatus to the plasma membrane. A combination of host and parasite functions contribute to the biogenesis of this compartment. Establishment of the mature inclusion is accompanied by the insertion of multiple chlamydial proteins, suggesting that chlamydiae actively modify the inclusion to define its interactions with the eukaryotic host cell. Despite being sequestered within a membrane-bound vacuole, chlamydiae clearly communicate with and manipulate the host cell from within this privileged intracellular niche.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.cellbio.18.012502.105845
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