| Contents | 7 |
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| FOREWORD | 14 |
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| ACKNOWLEDGMENTS | 17 |
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| Chapter 1 INTRODUCTION TO SPACE BIOLOGY | 18 |
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| 1 SPACE BIOLOGY: WHAT IS IT? | 18 |
| 1.1 Definitions | 20 |
| 1.2 Objectives of Space Biology | 23 |
| 1.3 Why Send Cells, Animals, and Plants in Space? | 25 |
| 1.4 Justification for Animals Models | 26 |
| 1.5 Frequently Asked Questions | 28 |
| 2 GRAVITATIONAL BIOLOGY | 30 |
| 2.1 Principles of Gravitational Biology | 31 |
| 2.2 Cell Physics | 33 |
| 2.3 Research Questions | 37 |
| 3 DEVELOPMENTAL BIOLOGY | 42 |
| 3.1 Principles of Development Biology | 43 |
| 3.2 Genetic Analyses | 48 |
| 3.3 Research Questions | 50 |
| 4 PLANT BIOLOGY | 53 |
| 4.1 Gravitropism | 55 |
| 4.2 Development of Plants | 55 |
| 4.3 Research Questions | 56 |
| 5 RADIATION BIOLOGY | 58 |
| 6 BIOTECHNOLOGY | 60 |
| 6.1 Definition | 60 |
| 6.2 Protein Crystal Analysis | 61 |
| 6.3 Tissue and Cell Culture | 62 |
| 6.4 New Technology | 64 |
| 7 REFERENCES | 66 |
| Chapter 2 ANIMALS AND PLANTS IN SPACE | 68 |
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| 1 SPACEFLIGHT HISTORY | 68 |
| 1.1 Preparation for Human Spaceflights | 69 |
| 1.2 Beginning of Systematic Biological Investigations | 74 |
| 1.3 Orbital Space Biology Laboratories | 77 |
| 2 ORGANISMS STUDIED IN SPACE | 79 |
| 3 MODEL ORGANISMS | 81 |
| 3.1 Bacteria | 82 |
| 3.2 Yeast | 83 |
| 3.3 Nematodes | 83 |
| 3.4 Drosophila | 84 |
| 3.5 Mammals | 85 |
| 3.6 Plants | 88 |
| 4 THE CLASSICS | 90 |
| 4.1 Amphibians | 91 |
| 4.2 Fish | 92 |
| 4.3 Avian | 93 |
| 5 CONCLUSION | 95 |
| 6 REFERENCES | 96 |
| Chapter 3 FACILITIES FOR GRAVITATIONAL BIOLOGY | 98 |
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| 1 TOOLS TO STUDY THE EFFECTS OF GRAVITY | 98 |
| 1.1 Microgravity Facilities | 99 |
| 1.2 Ground-Based Simulations | 108 |
| 1.2.1 Clinostat and Bioreactor | 109 |
| 1.2.2 Centrifuge | 112 |
| 1.2.3 Muscle Unloading | 113 |
| 2 ISSUES IN CONDUCTING SPACE BIOLOGY EXPERIMENTS | 114 |
| 2.1 Choice of Species | 114 |
| 2.2 Loading and Retrieval | 115 |
| 2.3 Control Groups | 116 |
| 3 SPACE BIOLOGY FACILITIES | 118 |
| 3.1 Cell Biology Facilities | 118 |
| 3.2 Animal Research Facilities | 120 |
| 3.3 Plant Research Facilities | 129 |
| 3.4 Multipurpose Facilities | 131 |
| 4 BASELINE DATA COLLECTION FACILITIES | 133 |
| 5 REFERENCES | 136 |
| Chapter 4 CELL BIOLOGY | 138 |
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| 1 INTRODUCTION | 139 |
| 1.1 Prologue | 139 |
| 1.2 History of Research on Cell Biology in Space | 139 |
| 1.3 Phase One | 141 |
| 1.4 Phase Two | 142 |
| 1.5 Phase Three | 144 |
| 1.6 Phase Four | 144 |
| 2 CRITICAL QUESTIONS IN CELL BIOLOGY | 145 |
| 2.1 Theoretical Considerations | 146 |
| 2.2 Further Considerations | 150 |
| 3 RESULTS OF SPACE EXPERIMENTS | 151 |
| 3.1 Results by Kinds of Cells | 152 |
| 3.2 Results by Cell Functions | 165 |
| 3.3 Conclusions | 178 |
| 4 SPACE RESEARCH IN CELL BIOLOGY: ISSUES | 178 |
| 5 CELL BIOLOGY IN SPACE: OUTLOOK | 180 |
| 6 REFERENCES | 184 |
| Chapter 5 ANIMAL DEVELOPMENT IN MICROGRAVITY | 188 |
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| 1 INTRODUCTION | 189 |
| 2 FERTILIZATION AND EMBRYONIC DEVELOPMENT | 190 |
| 2.1 Fertilization in Microgravity | 191 |
| 2.2 Cleavage, Gastrulation, and Neurulation | 193 |
| 2.3 Comparative Aspects of Embryonic Development | 198 |
| 3 ORGAN DEVELOPMENT | 199 |
| 3.1 Nervous System and Sensory Organs | 199 |
| 3.2 Muscle and Bone Development | 204 |
| 3.3 Respiratory Organ | 211 |
| 3.4 Other Organs | 213 |
| 4 FUNCTIONAL DEVELOPMENT | 213 |
| 4.1 Neuronal Activity | 214 |
| 4.2 Metabolic Activity | 216 |
| 4.3 Behavior | 219 |
| 4.4 Age-Related Microgravity Effects and Critical Periods | 225 |
| 4.5 Pregnancy | 228 |
| 4.6 Developmental Velocity | 229 |
| 4.7 Longevity and Aging | 230 |
| 4.8 Regeneration | 231 |
| 5 RESEARCH PERSPECTIVES | 233 |
| 5.1 Fertility during Long-Term Exposure | 233 |
| 5.2 Is Gravity Genetically Coded? | 234 |
| 6 REFERENCES | 236 |
| Chapter 6 PLANT DEVELOPMENT IN MICROGRAVITY | 244 |
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| 1 INTRODUCTION | 244 |
| 2 THE RESPONSE OF PLANTS TO A CHANGE IN THE DIRECTION OF GRAVITY | 246 |
| 2.1 Perception of Gravity in Plants | 246 |
| 2.2 Transduction of Gravistimulus | 250 |
| 2.3 Transmission of the Stimulus to the Reaction Zone | 253 |
| 2.4 Differential Growth | 254 |
| 3 GRAVITROPISM IN ACTUAL AND SIMULATED MICROGRAVITY | 257 |
| 3.1 Estimate of Gravisensitivity | 257 |
| 3.2 Statocyte Polarity | 261 |
| 3.3 Gravisensors: Starch Content and Volume | 263 |
| 3.4 Movement of the Organelles in Microgravity | 264 |
| 3.5 Gravitropic Response in Microgravity | 266 |
| 3.6 The Clinostat as a Tool for Studying Gravisensitivity | 268 |
| 4 THE ROLE OF GRAVITY IN PLANT DEVELOPMENT | 269 |
| 4.1 Plants and their Environments | 269 |