what is the main difference between positive and negative phase contrast techniques?

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Phase-contrast microscopy is an optical-microscopy technique that converts phase shifts in light passing through a transparent specimen to brightness changes in the ... - read more

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The term matrix-assisted laser desorption ionization (MALDI) was coined in 1985 by Franz Hillenkamp, Michael Karas and their colleagues. These researchers found that ... - read more

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INTRODUCTION. The database concerned with ion thermochemistry included in the WebBook makes available a reasonably complete listing of values for ... read more
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Relatively few ideas and equations are used to solve the phase behavior problem illustrated in Fig. 7.1. The most fundamental idea in thermodynamics is the ... ... read more
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