Maintaining physiologically controlled conditions during the transport of biological experiments remains a long-standing but under-addressed challenge in spaceflight operations. Pre-launch thermal or mechanical stress induce artefacts that compromise the interpretation of biological responses to space conditions. Existing transport systems are limited to basic heating of small sample containers and lack the capability to power and protect full experimental hardware during mission-critical phases. A modular transport incubator was developed and validated that combines active thermal regulation, battery-buffered power management, and mechanical protection in a compact, field-deployable platform. It enables autonomous environmental conditioning of complex biological payloads and continuous operation of integrated scientific instruments during ground-based transport and recovery. Validation included controlled experiments under sub-zero ambient temperatures, demonstrating rapid warm-up, stable thermal regulation, and uninterrupted autonomous performance. A steady-state finite difference thermal model was experimentally validated across 21 boundary conditions, enabling predictive power requirement estimation for mission planning. Field deployments during multiple MAPHEUS^® sounding rocket campaigns confirmed functional robustness under wind, snow, and airborne recovery scenarios. The system closes a critical infrastructure gap in spaceflight logistics. Its validated performance, modular architecture, and proven operational readiness establish it as an enabling platform for standardized, reproducible ground handling of biological payloads and experiment hardware.

Biological experiments under altered gravity conditions as encountered on sounding rockets often require automated in-flight chemical fixation under the challenging environmental and operational constraints, as accompanying any spaceflight mission. Enabling in-flight fixation while maintaining laboratory-equivalent cultivation conditions from ground handling to recovery poses significant challenges for reliability and reproducibility of experiment scenarios. A common flight-qualified architecture can address these constraints by enforcing controlled environmental and operational execution while decoupling sample-dependent fixation configurations through modular payload integration. This work describes a reusable, automated and standardized fixation payload platform designed to host interchangeable, pre-qualified chemical fixation payloads for biological experiments on a variety of platforms to achieve altered gravity. The module provides a standardized mechanical, thermal and electrical architecture for the integration and operation of experiments employing either adherent or suspension-based cells within a single flight-qualified unit, independent of the specific fixation configuration required. Hardware and operational performance were qualified within the German Aerospace Center’s (DLR) Materialphysikalische Experimente unter Schwerelosigkeit (MAPHEUS®) sounding rocket program. Laminar In-flight Fixation Technology (LIFT) was successfully flown across several missions and payload configurations, in-flight data demonstrate reliable execution of fixation procedures, stable thermal regulation, a pressure-stabilized internal environment and automated housekeeping data acquisition. The presented work establishes LIFT as a versatile, spaceflight-proven module to carry out a wide variety of cell culture experiments, allowing customizable in-flight fixation of samples as well as their monitoring within a common architecture.

Bioregenerative Life Support Systems (BLSS) are considered a key technology for long-duration human space exploration due to resource transport limitations. However, they require a systematic characterization and qualification before they can be integrated into large-scale demonstrators or analog facilities. Reproducible ground-based testing environments are therefore needed to maintain controlled boundary conditions while allowing payload-induced gas exchange to be discerned from external disturbances. This study presents a modular characterization environment developed for the qualification of BLSS payloads and technologies, with particular emphasis on cabin atmosphere gas exchange. The platform provides independent control of O₂, CO₂ and N₂ contents, thermal and humidity management and a distributed sensing architecture with database-integrated data logging to support long-duration operation. System performance was verified through long-duration experiments addressing cabin atmosphere stability, leakage-induced concentration drift, gas-composition control, disturbance response and thermal management. Defined O₂ and CO₂ concentration offsets were maintained over extended operating periods ranging from days to weeks with passive drift low enough to enable quantitative payload gas-exchange characterization. Stress testing under simulated O₂ consumption demonstrated robust controller performance under elevated disturbance loads. Thermal verification confirmed preservation of payload-specific temperature control, controlled condensate recovery and humidity management. These results demonstrate that the platform provides stable, configurable and reproducible boundary conditions for quantitative testing of BLSS payloads. By bridging laboratory-scale development and integrated BLSS facilities, the characterization environment enables technology qualification for full-scale implementation.