Chinese researchers have found that solar cells can retain most of their power conversion efficiency in near space, providing perspectives on the cells’ future application in space.
Perovskite solar cells (PSCs) are known for their potential of achieving higher efficiency and low production costs compared to traditional silicon solar cells.
These cells also have great potential for developing the new-generation energy technology for space application, but little research has been done to test the stability of PSCs in the extreme space environment, Xinhua news agency reported.
In the study, researchers from China’s Peking University sent the devices fixed with PSCs into near space on a high-altitude balloon.
The balloon rose to near space at an altitude of 35 km, a region above Earth’s atmosphere where there is only a trace amount of moisture and ozone.
The region, considered to have “air mass zero” contains no atmospheric attenuation of solar radiation and therefore several high-energy particles and radiation, such as neutrons, electrons and gamma rays, originate from the galactic cosmic rays and solar flares.
According to the findings, one type of PSCs used in the study retained more than 95 per cent of its initial power conversion efficiency during the test, the researchers reported in the journal Science China Physics, Mechanics and Astronomy.
They said the study is expected to play a crucial role in the future stability research of PSCs. (IANS)
Heart Rate gets altered in space but return to normal within 10 days on Earth, say researchers who examined cell-level cardiac function and gene expression in human heart cells cultured aboard the International Space Station (ISS) for 5.5 weeks.
Exposure to microgravity altered the expression of thousands of genes, but largely normal patterns of gene expression reappeared within 10 days after returning to Earth, according to the study published in the journal Stem Cell Reports.
“We’re surprised about how quickly human heart muscle cells are able to adapt to the environment in which they are placed, including microgravity,” said senior study author Joseph C. Wu from Stanford University.
These studies may provide insight into cellular mechanisms that could benefit astronaut health during long-duration spaceflight, or potentially lay the foundation for new insights into improving heart health on Earth.
Past studies have shown that spaceflight induces physiological changes in cardiac function, including reduced heart rate, lowered arterial pressure, and increased cardiac output.
But to date, most cardiovascular microgravity physiology studies have been conducted either in non-human models or at tissue, organ, or systemic levels.
Relatively little is known about the role of microgravity in influencing human cardiac function at the cellular level.
To address this question, the research team studied human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs). They generated hiPSC lines from three individuals by reprogramming blood cells, and then differentiated them into heart cells.
Beating heart cells were then sent to the ISS aboard a SpaceX spacecraft as part of a commercial resupply service mission.
Simultaneously, ground control heart cells were cultured on Earth for comparison purposes.
Upon return to Earth, space-flown heart cells showed normal structure and morphology. However, they did adapt by modifying their beating pattern and calcium recycling patterns.
In addition, the researchers performed RNA sequencing of heart cells harvested at 4.5 weeks aboard the ISS, and 10 days after returning to Earth.
These results showed that 2,635 genes were differentially expressed among flight, post-flight, and ground control samples.
Most notably, gene pathways related to mitochondrial function were expressed more in space-flown heart cells.
A comparison of the samples revealed that heart cells adopt a unique gene expression pattern during spaceflight, which reverts to one that is similar to groundside controls upon return to normal gravity, the study noted.
According to Wu, limitations of the study include its short duration and the use of 2D cell culture.
In future studies, the researchers plan to examine the effects of spaceflight and microgravity using more physiologically relevant hiPSC-derived 3D heart tissues with various cell types, including blood vessel cells.