Low Temperatures And Cold Molecules
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Low Temperatures And Cold Molecules
New, unexpected and largely unexplored physical phenomena occur in systems cooled to very low temperatures. The background temperature in the universe is approximately 2.7 K, but much lower temperatures have now been obtained in the laboratory. This book reviews the progress in a number of related fields in which the common themes are low temperatures and molecules, not atoms.This book brings together, for the first time, the results of recent research in areas ranging from the chemistry of cold interstellar clouds (10-20 K), through laboratory studies of the spectroscopy and kinetics of ions, radicals and molecules, to studies of molecules in liquid helium droplets, to attempts to create molecular (as distinct from atomic) Bose-Einstein condensates.The chapters fall into two parts, the first one dealing with low-temperature experiments and environments (ca. 1-20 K). In the context of this book, these chapters can be said to deal with relatively mature fields. The second part deals with very low temperatures and very cold molecules. Here, more emphasis is placed on the methods employed to generate samples of molecules at extremely low (1 K) temperatures.
Low Temperatures and Cold Molecules
This book brings together, for the first time, the results of recent research in areas ranging from the chemistry of cold interstellar clouds (10-20 K), through laboratory studies of the spectroscopy and kinetics of ions, radicals and molecules, to studies of molecules in liquid helium droplets, to attempts to create molecular (as distinct from atomic) Bose-Einstein condensates.
Low-Temperature Stress in Plants: Molecular Responses, Tolerance Mechanisms, Plant Biodesign and Breeding Applications
Low-temperature stress is the primary abiotic stress that affects the growth and development of plants and their geographical distribution. This can lead to the solidification of membrane lipids and decrease of enzymatic reaction rate in plants in a relatively short time, or indirectly affect the imbalance of respiration and photosynthesis, accumulation of toxic substances, ATP depletion, cell solute leakage and wilting due to water loss. Low-temperature stress can be divided into chilling stress and freezing stress according to the damage caused to plants. Both chilling and freezing stress drastically threaten global food security and species diversity in the northern and frigid temperate zones. Once plants experience low-temperature stress, the regulation mechanism of gene expression is rapidly activated to cope with the adverse environment.