Xem 1-20 trên 65 kết quả Plant viruses
  • “This book is both up-to-date and “This book covers aiswide range of very informative for traditional subjects, and it refreshing to and new generations of plant virologists in both industrialized and developing nations of the world. Moreover, some chapters present very interesting concepts regarding the use of molecular techniques to gain new insight into long-standing pathological issues, such as virus evolution, host adaptation, and epidemiology.

    pdf557p 3113513 05-10-2012 40 19   Download

  • Abstract: Recent wide-scale deployment of APC connectors in the outside plant for FTTH initiatives has forced connector manufacturers to consider reliability issues of these connectors. Angled connectors exhibit two phenomena not found in non-angled connectors: First, the lower ferrule endface radius of angled connectors makes the connector more susceptible to permanent fiber withdrawal at elevated temperatures. Second, any rotation of the ferrule in angled connectors will increase the apex offset of the connector.

    pdf12p vinhnghi 14-08-2009 60 6   Download

  • IN NATURAL HABITATS, plants are surrounded by an enormous number of potential enemies. Nearly all ecosystems contain a wide variety of bacteria, viruses, fungi, nematodes, mites, insects, mammals, and other herbivorous animals. By their nature, plants cannot avoid these herbivores and pathogens simply by moving away; they must protect themselves in other ways. The cuticle (a waxy outer layer) and the periderm (secondary protective tissue), besides retarding water loss, provide barriers to bacterial and fungal entry.

    pdf26p anhphuonggl 11-04-2013 34 5   Download

  • Fiber-to-the-premise architectures, by their very nature, require numerous fiber connections for distribution of services to multiple home and business locations. Much of the connectorization takes place downstream from the central office in the outside plant (OSP) portion of the network, traditionally a splice-only environment.

    pdf6p mylinh 14-08-2009 46 3   Download

  • ADC’s line of outdoor all-dielectric loose tube cables with polyethylene jackets are designed to meet all the rigors of the outside plant environment. The cable core is protected from moisture with a water swellable tape, eliminating the need for a filling compound. Terminations require less effort making the installation easier.

    pdf4p mylinh 14-08-2009 50 2   Download

  • Sesbania mosaic virus (SeMV) is a single-stranded positive-sense RNA plant virus belonging to the genus Sobemovirus. The movement protein (MP) encoded by SeMV ORF1 showed no significant sequence similarity with MPs of other genera, but showed 32% identity with the MP of South-ern bean mosaic virus within the Sobemovirus genus.

    pdf16p mobifone23 07-01-2013 11 2   Download

  • ADC’s OmniReach™ FTTX Solutions are the industry’s first infrastructure solutions designed from the ground up to meet the unique requirements of FTTX networks. Designed for operational efficiency and scalability, OmniReach solutions simplify FTTX network installation, maintenance and management from the central office/headend to the outside plant.

    pdf12p mylinh 13-08-2009 106 15   Download

  • ADC’s HDSL Interface Panel combines HDSL termination, DSX-1 and DSX-3 into a single shelf supporting the outside plant environment. With its modular design, the universal panel saves space without sacrificing quality.

    pdf2p maiphuong 14-08-2009 57 10   Download

  • After helping design and build passive optical networks (PON) for 10 towns since 1999, Vince Smith has learned a thing or two about fiber to the premises (FTTP) projects. By the time he was hired in 2003 by Texas-based NTS Communications as an outside plant engineer, Smith had acquired good experience with different architectures as well as with products from different vendors.

    pdf4p maiphuong 13-08-2009 54 9   Download

  • Although it’s fair to say the distribution and access elements within the outside plant (OSP) portion of the fiber-to-the-premise (FTTP) network demand the majority of attention during deployment, it’s still important not to overlook implications to the central office (CO). Any FTTP network requires the same flexibility as the transport network—and it all begins in the CO.

    pdf4p mylinh 13-08-2009 74 7   Download

  • There has never been more pressure on bandwidth and cable plant. The resources of cable providers and telephone companies are being stretched to the limit due to the addition of such items as second lines for children, computers, security and the advent of the “smart house.” This situation is compounded by the race to offer the telecommunications “triple play” – a combination of voice services; cable TV and video on demand; and high-speed data and Internet access.

    pdf21p mylinh 14-08-2009 79 7   Download

  • As carriers begin deploying FTTX architectures, they are focusing a lot of attention on the outside plant (OSP) segment. And why not? This architecture presents many challenges with passive optical networking (PON) technology, thousands of distribution lines and connections, power and distance concerns, and so many other issues to address. Basically, the mindset is that if a problem is going to surface during the FTTX deployment, it will likely happen downstream.

    pdf4p vinhnghi 14-08-2009 51 6   Download

  • ADC’s innovative line of indoor/outdoor loose tube cables are designed to meet all the rigors of the outside plant environment and have the necessary fire ratings to be installed inside the building. These cables eliminate the messy gel filler of traditional loose tube style cables with super absorbent polymers. The installer can place the cable anywhere in the network, bypassing the transition points required in most installations. Cables are available with fiber counts from 2 to 144.

    pdf4p maiphuong 13-08-2009 59 5   Download

  • ADC’s OmniReach™ FTTX Solutions are the industry’s first infrastructure solutions designed from the ground up to meet the unique requirements of FTTX networks. Designed for operational efficiency and scalability, OmniReach solutions simplify FTTX network installation, maintenance and management from the central office/headend to the outside plant.

    pdf2p mylinh 13-08-2009 74 5   Download

  • The lure of fiber-to-the-node (FTTN) solutions is compelling. It offers 24 Mb/s service today with technologies on the horizon that promise more. As compared to fiber-to-the-premise (FTTP) overbuilds, FTTN requires one fifth the capital investment and one quarter of the deployment time, according to industry analysts. Most compelling is the prospect of reusing existing copper distribution and feeder plant—all of which might be nearly or fully depreciated.

    pdf8p maiphuong 13-08-2009 63 5   Download

  • Deploying fiber to MDUs, such as apartment complexes, condominiums, townhouses, and other multi-family locations, represents a lucrative market for broadband service providers. At the same time, these applications present unique challenges in both greenfield and overbuild scenarios. This paper addresses the key elements of MDU construction practices, including the physical plant from backbone to premise and the architectural decisions required for a successful MDU application. It will also cover additional network considerations for equipment and connectivity techniques....

    pdf8p maiphuong 14-08-2009 86 5   Download

  • Polymerase Chain Reaction is widely held as one of the most important inventions of the 20th century in molecular biology. Small amounts of the genetic material can now be amplified to be able to a identify, manipulate DNA, detect infectious organisms, including the viruses that cause AIDS, hepatitis, tuberculosis, detect genetic variations, including mutations, in human genes and numerous other tasks.

    ppt62p zingzing09 24-04-2013 19 5   Download

  • In today’s and tomorrow’s fiber-to-the-premises (FTTP) architectures, the best solution for offering multiple services to subscribers will be the one that is the most cost effective, flexible, and scalable. With its 65-year history of innovative solutions for managing the physical cable plant, ADC is bringing all its experience to bear in the outside plant (OSP) and fiber-to-the-premises (FTTP) markets. Driven by the customer’s need for overall affordability and operational flexibility, ADC is designing and building the first true FTTP solution – from the ground up....

    pdf4p mylinh 13-08-2009 56 4   Download

  • The successful deployment of any flexible, cost-effective fiber-to-the-premise (FTTP) network requires thoughtful decisions regarding all segments of the network, from the optical line terminal (OLT) in the central office to the optical network terminal (ONT) attached to each home and everything in between. While much attention is focused on the distribution and access elements within the outside plant (OSP) network, it’s also important to consider the implications of FTTP architectures within the central office (CO)....

    pdf6p mylinh 14-08-2009 49 4   Download

  • Fiber-to-the-premise (FTTP) architectures are presenting both new challenges and new opportunities regarding the use of connectors in the outside plant (OSP). At no other time have connectors been as necessary in OSP architectures – and they are destined to become even more prevalent in the days ahead as the FTTP networking market continues to gain momentum. Service providers competing for the FTTP market require the same flexibility in test access and the ability to provision that they have typically enjoyed in the central office. They need to scale service in a cost-effective manner....

    pdf5p mylinh 14-08-2009 44 4   Download

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